PR c/20043

[official-gcc.git] / gcc / ada / einfo.ads

------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                                E I N F O                                 --
--                                                                          --
--                                 S p e c                                  --
--                                                                          --
--          Copyright (C) 1992-2005, Free Software Foundation, Inc.         --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
-- for  more details.  You should have  received  a copy of the GNU General --
-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
-- MA 02111-1307, USA.                                                      --
--                                                                          --
-- As a special exception,  if other files  instantiate  generics from this --
-- unit, or you link  this unit with other files  to produce an executable, --
-- this  unit  does not  by itself cause  the resulting  executable  to  be --
-- covered  by the  GNU  General  Public  License.  This exception does not --
-- however invalidate  any other reasons why  the executable file  might be --
-- covered by the  GNU Public License.                                      --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

with Snames; use Snames;
with Types;  use Types;
with Uintp;  use Uintp;
with Urealp; use Urealp;

package Einfo is

--  This package defines the annotations to the abstract syntax tree that
--  are needed to support semantic processing of an Ada compilation.

--  Note that after editing this spec and the corresponding body it is
--  required to run ceinfo to check the consistentcy of spec and body.
--  See ceinfo.adb for more information about the checks made.

--  These annotations are for the most part attributes of declared entities,
--  and they correspond to conventional symbol table information. Other
--  attributes include sets of meanings for overloaded names, possible
--  types for overloaded expressions, flags to indicate deferred constants,
--  incomplete types, etc. These attributes are stored in available fields
--  in tree nodes (i.e. fields not used by the parser, as defined by the
--  Sinfo package specification), and accessed by means of a set of
--  subprograms which define an abstract interface.

--  There are two kinds of semantic information

--    First, the tree nodes with the following Nkind values:

--      N_Defining_Identifier
--      N_Defining_Character_Literal
--      N_Defining_Operator_Symbol

--    are called Entities, and constitute the information that would often
--    be stored separately in a symbol table. These nodes are all extended
--    to provide extra space, and contain fields which depend on the entity
--    kind, as defined by the contents of the Ekind field. The use of the
--    Ekind field, and the associated fields in the entity, are defined
--    in this package, as are the access functions to these fields.

--    Second, in some cases semantic information is stored directly in other
--    kinds of nodes, e.g. the Etype field, used to indicate the type of an
--    expression. The access functions to these fields are defined in the
--    Sinfo package, but their full documentation is to be found in
--    the Einfo package specification.

--  Declaration processing places information in the nodes of their defining
--  identifiers. Name resolution places in all other occurrences of an
--  identifier a pointer to the corresponding defining occurrence.

--------------------------------
-- The XEINFO Utility Program --
--------------------------------

--  XEINFO is a utility program which automatically produces a C header file,
--  a-xeinfo.h from the spec and body of package Einfo. It reads the input
--  files einfo.ads and einfo.adb and produces the output file a-xeinfo.h.

--  In order for this utility program to operate correctly, the form of the
--  einfo.ads and einfo.adb files must meet certain requirements and be laid
--  out in a specific manner.

--  The general form of einfo.ads is as follows:

--     type declaration for type Entity_Kind
--     subtype declarations declaring subranges of Entity_Kind
--     subtype declarations declaring synonyms for some standard types
--     function specs for attributes
--     procedure specs
--     pragma Inline declarations

--  This order must be observed. There are no restrictions on the procedures,
--  since the C header file only includes functions (Gigi is not allowed to
--  modify the generated tree). However, functions are required to have headers
--  that fit on a single line.

--  XEINFO reads and processes the function specs and the pragma Inlines. For
--  functions that are declared as inlined, XEINFO reads the corresponding body
--  from xeinfo.adb, and processes it into C code. This results in some strict
--  restrictions on which functions can be inlined:

--     The function spec must be on a single line

--     There can only be a single statement, contained on a single line,
--     not counting any pragma Assert statements.

--     This single statement must either by a function call with simple,
--     single token arguments, or it must be a membership test of the form
--     a in b, where a and b are single tokens.

--  For functions that are not inlined, there is no restriction on the body,
--  and XEINFO generates a direct reference in the C header file which allows
--  the C code in Gigi to directly call the corresponding Ada body.

----------------------------------
-- Handling of Type'Size Values --
----------------------------------

--  The Ada 95 RM contains some rather peculiar (to us!) rules on the value
--  of type'Size (see RM 13.3(55)). We have found that attempting to use
--  these RM Size values generally, and in particular for determining the
--  default size of objects, creates chaos, and major incompatibilies in
--  existing code.

--  We proceed as follows, for discrete and fixed-point subtypes, we have
--  two separate sizes for each subtype:

--    The Object_Size, which is used for determining the default size of
--    objects and components. This size value can be referred to using the
--    Object_Size attribute. The phrase "is used" here means that it is
--    the basis of the determination of the size. The backend is free to
--    pad this up if necessary for efficiency, e.g. an 8-bit stand-alone
--    character might be stored in 32 bits on a machine with no efficient
--    byte access instructions such as the Alpha.

--    The default rules for the value of Object_Size for fixed-point and
--    discrete types are as follows:

--       The Object_Size for base subtypes reflect the natural hardware
--       size in bits (see Ttypes and Cstand for integer types). For
--       enumeration and fixed-point base subtypes have 8. 16. 32 or 64
--       bits for this size, depending on the range of values to be stored.

--       The Object_Size of a subtype is the same as the Object_Size of
--       the subtype from which it is obtained.

--       The Object_Size of a derived base type is copied from the parent
--       base type, and the Object_Size of a derived first subtype is copied
--       from the parent first subtype.

--    The Value_Size which is the number of bits required to store a value
--    of the type. This size can be referred to using the Value_Size
--    attribute. This value is used to determine how tightly to pack
--    records or arrays with components of this type, and also affects
--    the semantics of unchecked conversion (unchecked conversions where
--    the Value_Size values differ generate a warning, and are potentially
--    target dependent).

--    The default rule for the value of Value_Size are as follows:

--       The Value_Size for a base subtype is the minimum number of bits
--       required to store all values of the type (including the sign bit
--       only if negative values are possible).

--       If a subtype statically matches the first subtype, then it has
--       by default the same Value_Size as the first subtype. This is a
--       consequence of RM 13.1(14) ("if two subtypes statically match,
--       then their subtype-specific aspects are the same".)

--       All other subtypes have a Value_Size corresponding to the minimum
--       number of bits required to store all values of the subtype. For
--       dynamic bounds, it is assumed that the value can range down or up
--       to the corresponding bound of the ancestor

--    The RM defined attribute Size corresponds to the Value_Size attribute.

--    The Size attribute may be defined for a first-named subtype. This sets
--    the Value_Size of the first-named subtype to the given value, and the
--    Object_Size of this first-named subtype to the given value padded up
--    to an appropriate boundary. It is a consequence of the default rules
--    above that this Object_Size will apply to all further subtypes. On the
--    otyher hand, Value_Size is affected only for the first subtype, any
--    dynamic subtypes obtained from it directly, and any statically matching
--    subtypes. The Value_Size of any other static subtypes is not affected.

--    Value_Size and Object_Size may be explicitly set for any subtype using
--    an attribute definition clause. Note that the use of these attributes
--    can cause the RM 13.1(14) rule to be violated. If two access types
--    reference aliased objects whose subtypes have differing Object_Size
--    values as a result of explicit attribute definition clauses, then it
--    is erroneous to convert from one access subtype to the other.

--    At the implementation level, Esize stores the Object_Size and the
--    RM_Size field stores the Value_Size (and hence the value of the
--    Size attribute, which, as noted above, is equivalent to Value_Size).

--  To get a feel for the difference, consider the following examples (note
--  that in each case the base is short_short_integer with a size of 8):

--                                            Object_Size     Value_Size

--     type x1 is range 0..5;                      8               3

--     type x2 is range 0..5;
--     for x2'size use 12;                        12              12

--     subtype x3 is x2 range 0 .. 3;             12               2

--     subtype x4 is x2'base range 0 .. 10;        8               4

--     subtype x5 is x2 range 0 .. dynamic;       12              (7)

--     subtype x6 is x2'base range 0 .. dynamic;   8              (7)

--  Note: the entries marked (7) are not actually specified by the Ada 95 RM,
--  but it seems in the spirit of the RM rules to allocate the minimum number
--  of bits known to be large enough to hold the given range of values.

--  So far, so good, but GNAT has to obey the RM rules, so the question is
--  under what conditions must the RM Size be used. The following is a list
--  of the occasions on which the RM Size must be used:

--    Component size for packed arrays or records
--    Value of the attribute Size for a type
--    Warning about sizes not matching for unchecked conversion

--  The RM_Size field keeps track of the RM Size as needed in these
--  three situations.

--  For types other than discrete and fixed-point types, the Object_Size
--  and Value_Size are the same (and equivalent to the RM attribute Size).
--  Only Size may be specified for such types.

-----------------------
-- Entity Attributes --
-----------------------

--  This section contains a complete list of the attributes that are defined
--  on entities. Some attributes apply to all entities, others only to certain
--  kinds of entities. In the latter case the attribute should only be set or
--  accessed if the Ekind field indicates an appropriate entity.

--  There are two kinds of attributes that apply to entities, stored and
--  synthesized. Stored attributes correspond to a field or flag in the entity
--  itself. Such attributes are identified in the table below by giving the
--  field or flag in the attribute that is used to hold the attribute value.
--  Synthesized attributes are not stored directly, but are rather computed as
--  needed from other attributes, or from information in the tree. These are
--  marked "synthesized" in the table below. The stored attributes have both
--  access functions and set procedures to set the corresponding values, while
--  synthesized attributes have only access functions.

--  Note: in the case of Node, Uint, or Elist fields, there are cases where
--  the same physical field is used for different purposes in different
--  entities, so these access functions should only be referenced for the
--  class of entities in which they are defined as being present. Flags are
--  not overlapped in this way, but nevertheless as a matter of style and
--  abstraction (which may or may not be checked by assertions in the body),
--  this restriction should be observed for flag fields as well.

--  Note: certain of the attributes on types apply only to base types, and
--  are so noted by the notation [base type only]. These are cases where the
--  attribute of any subtype is the same as the attribute of the base type.
--  The attribute can be referenced on a subtype (and automatically retrieves
--  the value from the base type). However, it is an error to try to set the
--  attribute on other than the base type, and if assertions are enabled,
--  an attempt to set the attribute on a subtype will raise an assert error.

--  Other attributes are noted as applying the implementation base type only.
--  These are representation attributes which must always apply to a full
--  non-private type, and where the attributes are always on the full type.
--  The attribute can be referenced on a subtype (and automatically retries
--  the value from the implementation base type). However, it is an error
--  to try to set the attribute on other than the implementation base type,
--  and if assertions are enabled, an attempt to set the attribute on a
--  subtype will raise an assert error.

--    Accept_Address (Elist21)
--       Present in entries. If an accept has a statement sequence, then an
--       address variable is created, which is used to hold the address of the
--       parameters, as passed by the runtime. Accept_Address holds an element
--       list which represents a stack of entities for these address variables.
--       The current entry is the top of the stack, which is the last element
--       on the list. A stack is required to handle the case of nested select
--       statements referencing the same entry.

--    Actual_Subtype (Node17)
--       Present in variables, constants, and formal parameters. This is the
--       subtype imposed by the value of the object, as opposed to its nominal
--       subtype, which is imposed by the declaration. The actual subtype
--       differs from the nominal one when the latter is indefinite (as in the
--       case of an unconstrained formal parameter, or a variable declared
--       with an unconstrained type and an initial value). The nominal subtype
--       is the Etype entry for the entity. The Actual_Subtype field is set
--       only if the actual subtype differs from the nominal subtype. If the
--       actual and nominal subtypes are the same, then the Actual_Subtype
--       field is Empty, and Etype indicates both types.
--
--       For objects, the Actual_Subtype is set only if this is a discriminated
--       type. For arrays, the bounds of the expression are obtained and the
--       Etype of the object is directly the constrained subtype. This is
--       rather irregular, and the semantic checks that depend on the nominal
--       subtype being unconstrained use flag Is_Constr_Subt_For_U_Nominal(qv).

--    Access_Disp_Table (Node16) [implementation base type only]
--       Present in record type entities. For a tagged type, points to the
--       dispatch table associated with the tagged type. For a non-tagged
--       record, contains Empty.

--    Address_Clause (synthesized)
--       Applies to entries, objects and subprograms. Set if an address clause
--       is present which references the object or subprogram and points to
--       the N_Attribute_Definition_Clause node. Empty if no Address clause.
--       The expression in the address clause is always a constant that is
--       defined before the entity to which the address clause applies.
--       Note: Gigi references this field in E_Task_Type entities???

--    Address_Taken (Flag104)
--       Present in all entities. Set if the Address or Unrestricted_Access
--       attribute is applied directly to the entity, i.e. the entity is the
--       entity of the prefix of the attribute reference. Used by Gigi to
--       make sure that the address can be meaningfully taken.

--    Alias (Node18)
--       Present in overloaded entities (literals, subprograms, entries).
--       Points to parent subprogram of a derived subprogram. Also used for
--       a subprogram renaming, where it points to the renamed subprogram.
--       Always empty for entries.

--    Alignment (Uint14)
--       Present in entities for types and also in constants, variables,
--       loop parameters, and formal parameters. This indicates the desired
--       alignment for a type, or the actual alignment for an object. A value
--       of zero (Uint_0) indicates that the alignment has not been set yet.
--       The alignment can be set by an explicit alignment clause, or set by
--       the front-end in package Layout, or set by the back-end as part of
--       the back end back-annotation process. The alignment field is also
--       present in E_Exception entities, but there it is used only by the
--       back-end for back annotation.

--    Alignment_Clause (synthesized)
--       Appllies to all entities for types and objects. If an alignment
--       attribute definition clause is present for the entity, then this
--       function returns the N_Attribute_Definition clause that specifies the
--       alignment. If no alignment clause applies to the type, then the call
--       to this function returns Empty. Note that the call can return a
--       non-Empty value even if Has_Alignment_Clause is not set (happens with
--       subtype and derived type declarations). Note also that a record
--       definition clause with an (obsolescent) mod clause is converted
--       into an attribute definition clause for this purpose.

--    Ancestor_Subtype (synthesized)
--       Applies to all type and subtype entities. If the argument is a
--       subtype then it returns the subtype or type from which the subtype
--       was obtained, otherwise it returns Empty.

--    Associated_Formal_Package (Node12)
--       Present in packages that are the actuals of formal_packages. Points
--       to the entity in the declaration for the formal package.

--    Associated_Node_For_Itype (Node8)
--       Present in all type and subtype entities. Set non-Empty only for
--       Itypes. Set to point to the associated node for the Itype, i.e.
--       the node whose elaboration generated the Itype. This is used for
--       copying trees, to determine whether or not to copy an Itype.

--    Associated_Storage_Pool (Node22) [root type only]
--       Present in simple and general access type entities. References the
--       storage pool to be used for the corresponding collection. A value of
--       Empty means that the default pool is to be used. This is present
--       only in the root type, since derived types must have the same pool
--       as the parent type.

--    Associated_Final_Chain (Node23)
--       Present in simple and general access type entities. References the
--       List_Controller object that holds the finalization chain on which
--       are attached dynamically allocated objects referenced by the access
--       type. Empty when the access type cannot reference a controlled object.

--    Barrier_Function (Node12)
--       Present in protected entries and entry families. This is the
--       subprogram declaration for the body of the function that returns
--       the value of the entry barrier.

--    Base_Type (synthesized)
--       Applies to all type entities. Returns the base type of a type or
--       subtype. The base type of a type is the type itself. The base type
--       of a subtype is the type that it constrains (which is always a type
--       entity, not some other subtype). Note that in the case of a subtype
--       of a private type, it is possible for the base type attribute to
--       return a private type, even if the subtype to which it applies is
--       non-private. See also Implementation_Base_Type. Note: it is allowed
--       to apply Base_Type to other than a type, in which case it simply
--       returns the entity unchanged.

--    Block_Node (Node11)
--       Present in block entities. Points to the identifier in the
--       Block_Statement itself. Used when retrieving the block construct
--       for finalization purposes, The block entity has an implicit label
--       declaration in the enclosing declarative part, and has otherwise
--       no direct connection in the tree with the block statement. The
--       link is to the identifier (which is an occurence of the entity)
--       and not to the block_statement itself, because the statement may
--       be rewritten, e.g. in the process of removing dead code.

--    Body_Entity (Node19)
--       Present in package and generic package entities, points to the
--       corresponding package body entity if one is present.

--    Body_Needed_For_SAL (Flag40)
--       Present in package and subprogram entities that are compilation
--       units. Indicates that the source for the body must be included
--       when the unit is part of a standalone library.

--    C_Pass_By_Copy (Flag125) [implementation base type only]
--       Present in record types. Set if a pragma Convention for the record
--       type specifies convention C_Pass_By_Copy. This convention name is
--       treated as identical in all respects to convention C, except that
--       if it is specified for a record type, then the C_Pass_By_Copy flag
--       is set, and if a foreign convention subprogram has a formal of the
--       corresponding type, then the parameter passing mechanism will be
--       set to By_Copy (unless specifically overridden by an Import or
--       Export pragma).

--    Can_Never_Be_Null (Flag38)
--       This flag is present in all entities, but can only be set in an
--       object which can never have a null value. This is used to avoid
--       unncessary resetting of the Is_Known_Non_Null flag for such
--       entities. The cases where this is set True are constant access
--       values initialized to a non-null value, and access parameters.

--    Chars (Name1)
--       Present in all entities. This field contains an entry into the names
--       table that has the character string of the identifier, character
--       literal or operator symbol. See Namet for further details. Note that
--       throughout the processing of the front end, this name is the simple
--       unqualified name. However, just before gigi is called, a call is made
--       to Qualify_All_Entity_Names. This causes entity names to be qualified
--       using the encoding described in exp_dbug.ads, and from that point on
--       (including post gigi steps such as cross-reference generation), the
--       entities will contain the encoded qualified names.

--    Checks_May_Be_Suppressed (Flag31)
--       Present in all entities. Set if a pragma Suppress or Unsuppress
--       mentions the entity specifically in the second argument. If this
--       flag is set the the Global_Entity_Suppress and Local_Entity_Suppress
--       tables must be consulted to determine if the is actually an active
--       Suppress or Unsuppress pragma that applies to the entity.

--    Class_Wide_Type (Node9)
--       Present in all type entities. For a tagged type or subtype, returns
--       the corresponding implicitly declared class-wide type. Set to Empty
--       for non-tagged types.

--    Cloned_Subtype (Node16)
--       Present in E_Record_Subtype and E_Class_Wide_Subtype entities.
--       Each such entity can either have a Discriminant_Constraint, in
--       which case it represents a distinct type from the base type (and
--       will have a list of components and discrimants in the list headed by
--       First_Entity) or else no such constraint, in which case it will be a
--       copy of the base type.
--
--       o  Each element of the list in First_Entity is copied from the base
--          type; in that case, this field is Empty.
--
--       o  The list in First_Entity is shared with the base type; in that
--          case, this field points to that entity.
--
--       A record or classwide subtype may also be a copy of some other
--       subtype and share the entities in the First_Entity with that subtype.
--       In that case, this field points to that subtype.
--
--       For E_Class_Wide_Subtype, the presence of Equivalent_Type overrides
--       this field. Note that this field ONLY appears in subtype entries, not
--       in type entries, it is not present, and it is an error to reference
--       Cloned_Subtype in an E_Record_Type or E_Class_Wide_Type entity.

--    Comes_From_Source
--       This flag appears on all nodes, including entities, and indicates
--       that the node was created by the scanner or parser from the original
--       source. Thus for entities, it indicates that the entity is defined
--       in the original source program.

--    Component_Alignment (special field) [base type only]
--       Present in array and record entities. Contains a value of type
--       Component_Alignment_Kind indicating the alignment of components.
--       Set to Calign_Default normally, but can be overridden by use of
--       the Component_Alignment pragma. Note: this field is currently
--       stored in a non-standard way, see body for details.

--    Component_Bit_Offset (Uint11)
--       Present in record components (E_Component, E_Discriminant) if a
--       component clause applies to the component. First bit position of
--       given component, computed from the first bit and position values
--       given in the component clause. A value of No_Uint means that the
--       value is not yet known. The value can be set by the appearence of
--       an explicit component clause in a record representation clause,
--       or it can be set by the front-end in package Layout, or it can be
--       set by the backend. By the time backend processing is completed,
--       this field is always set. A negative value is used to represent
--       a value which is not known at compile time, and must be computed
--       at run-time (this happens if fields of a record have variable
--       lengths). See package Layout for details of these values.
--
--       Note: this field is obsolescent, to be eventually replaced entirely
--       by Normalized_First_Bit and Normalized_Position, but for the moment,
--       gigi is still using (and back annotating) this field, and gigi does
--       not know about the new fields. For the front end layout case, the
--       Component_Bit_Offset field is only set if it is static, and otherwise
--       the new Normalized_First_Bit and Normalized_Position fields are used.

--    Component_Clause (Node13)
--       Present in record components and discriminants. If a record
--       representation clause is present for the corresponding record
--       type a that specifies a position for the component, then the
--       Component_Clause field of the E_Component entity points to the
--       N_Component_Clause node. Set to Empty if no record representation
--       clause was present, or if there was no specification for this
--       component.

--    Component_Size (Uint22) [implementation base type only]
--       Present in array types. It contains the component size value for
--       the array. A value of No_Uint means that the value is not yet set.
--       The value can be set by the use of a component size clause, or
--       by the front end in package Layout, or by the backend. A negative
--       value is used to represent a value which is not known at compile
--       time, and must be computed at run-time (this happens if the type
--       of the component has a variable length size). See package Layout
--       for details of these values.

--    Component_Type (Node20) [implementation base type only]
--       Present in array types and string types. References component type.

--    Constant_Value (synthesized)
--       Applies to variables, constants, named integers, and named reals.
--       Obtains the initialization expression for the entity. Will return
--       Empty for for a deferred constant whose full view is not available
--       or in some other cases of internal entities, which cannot be treated
--       as constants from the point of view of constant folding. Empty is
--       also returned for variables with no initialization expression.

--    Corresponding_Concurrent_Type (Node18)
--       Present in record types that are constructed by the expander to
--       represent task and protected types (Is_Concurrent_Record_Type flag
--       set True). Points to the entity for the corresponding task type or
--       protected type.

--    Corresponding_Discriminant (Node19)
--       Present in discriminants of a derived type, when the discriminant is
--       used to constrain a discriminant of the parent type. Points to the
--       corresponding discriminant in the parent type. Otherwise it is Empty.

--    Corresponding_Equality (Node13)
--       Present in function entities for implicit inequality operators.
--       Denotes the explicit or derived equality operation that creates
--       the implicit inequality. Note that this field is not present in
--       other function entities, only in implicit inequality routines,
--       where Comes_From_Source is always False.

--    Corresponding_Record_Type (Node18)
--       Present in protected and task types and subtypes. References the
--       entity for the corresponding record type constructed by the expander
--       (see Exp_Ch9). This type is used to represent values of the task type.

--    Corresponding_Remote_Type (Node22)
--      Present in record types that describe the fat pointer structure for
--      Remote_Access_To_Subrogram types. References the original access type.

--    CR_Discriminant (Node23)
--      Present in discriminants of concurrent types. Denotes the homologous
--      discriminant of the corresponding record type. The CR_Discriminant is
--      created at the same time as the discriminal, and used to replace
--      occurrences of the discriminant within the type declaration.

--    Current_Value (Node9)
--       Present in E_Variable, E_Out_Parameter and E_In_Out_Parameter
--       entities. Set non-Empty if the (constant) current value of the
--       variable is known. This value is valid only for references from
--       the same sequential scope as the entity. The sequential scope
--       of an entity includes the immediate scope and any contained
--       scopes that are package specs, package bodies, or blocks (at
--       any nesting level). For convenience in coding, this field is
--       also present in other object entities (E_Loop_Parameter and
--       E_In_Parameter and E_Constant), but is not used to hold a
--       constant value, since value tracking is not needed in this case.
--
--       Another related use of this field is to record information
--       about the value obtained from an IF statement condition.
--       If the IF/ELSIF condition has the form "[NOT] OBJ RELOP VAL",
--       where OBJ is a reference to an entity with a Current_Value field,
--       RELOP is one of the six relational operators, and VAL is a compile-
--       time known value, then the Current_Value field if OBJ is set to
--       point to the N_If_Statement or N_Elsif_Part node of the relevant
--       construct. For more details on this usage, see the procedure
--       Exp_Util.Get_Current_Value_Condition.

--    Debug_Info_Off (Flag166)
--       Present in all entities. Set if a pragma Suppress_Debug_Info applies
--       to the entity, or if internal processing in the compiler determines
--       that suppression of debug information is desirable. Note that this
--       flag is only for use by the front end as part of the processing for
--       determining if Needs_Debug_Info should be set. The back end should
--       always test Needs_Debug_Info, it should never test Debug_Info_Off.

--    Debug_Renaming_Link (Node13)
--       Used to link the enumeration literal of a debug renaming declaration
--       to the renamed entity. See Exp_Dbug.Debug_Renaming_Declaration for
--       details of the use of this field.

--    Declaration_Node (synthesized)
--       Applies to all entities. Returns the tree node for the declaration
--       that declared the entity. Normally this is just the Parent of the
--       entity. One exception arises with child units, where the parent of
--       the entity is a selected component or a defining program unit name.
--       Another exception is that if the entity is an incomplete type that
--       has been completed, then we obtain the declaration node denoted by
--       the full type, i.e. the full type declaration node.

--    Default_Expr_Function (Node21)
--       Present in parameters. It holds the entity of the parameterless
--       function that is built to evaluate the default expression if it is
--       more complex than a simple identifier or literal. For the latter
--       simple cases or if there is no default value, this field is Empty.

--    Default_Expressions_Processed (Flag108)
--       A flag in subprograms (functions, operators, procedures) and in
--       entries and entry families used to indicate that default expressions
--       have been processed and to avoid multiple calls to process the
--       default expressions (see Freeze.Process_Default_Expressions), which
--       would not only waste time, but also generate false error messages.

--    Default_Value (Node20)
--       Present in formal parameters. Points to the node representing the
--       expression for the default value for the parameter. Empty if the
--       parameter has no default value (which is always the case for OUT
--       and IN OUT parameters in the absence of errors).

--    Delay_Cleanups (Flag114)
--       Present in entities that have finalization lists (subprograms
--       blocks, and tasks). Set if there are pending generic body
--       instantiations for the corresponding entity. If this flag is
--       set, then generation of cleanup actions for the corresponding
--       entity must be delayed, since the insertion of the generic body
--       may affect cleanup generation (see Inline for further details).

--    Delay_Subprogram_Descriptors (Flag50)
--       Present in entities for which exception subprogram descriptors
--       are generated (subprograms, package declarations and package
--       bodies). Present if there are pending generic body instantiations
--       for the corresponding entity. If this flag is set, then generation
--       of the subprogram descriptor for the corresponding enities must
--       be delayed, since the insertion of the generic body may add entries
--       to the list of handlers.
--
--       Note: for subprograms, Delay_Subprogram_Descriptors is set if and
--       only if Delay_Cleanups is set. But Delay_Cleanups can be set for a
--       a block (in which case Delay_Subprogram_Descriptors is set for the
--       containing subprogram). In addition Delay_Subprogram_Descriptors is
--       set for a library level package declaration or body which contains
--       delayed instantiations (in this case the descriptor refers to the
--       enclosing elaboration procedure).

--    Delta_Value (Ureal18)
--       Present in fixed and decimal types. Points to a universal real
--       that holds value of delta for the type, as given in the declaration
--       or as inherited by a subtype or derived type.

--    Dependent_Instances (Elist8)
--       Present in packages that are instances. Holds list of instances
--       of inner generics. Used to place freeze nodes for those instances
--       after that of the current one, i.e. after the corresponding generic
--       bodies.

--    Depends_On_Private (Flag14)
--       Present in all type entities. Set if the type is private or if it
--       depends on a private type.

--    Designated_Type (synthesized)
--       Applies to access types. Returns the designated type. Differs
--       from Directly_Designated_Type in that if the access type refers
--       to an incomplete type, and the full type is available, then this
--       full type is returned instead of the incomplete type.

--    Digits_Value (Uint17)
--       Present in floating point types and subtypes and decimal types and
--       subtypes. Contains the Digits value specified in the declaration.

--    Directly_Designated_Type (Node20)
--       Present in access types. This field points to the type that is
--       directly designated by the access type. In the case of an access
--       type to an incomplete type, this field references the incomplete
--       type. Note that in the semantic processing, what is useful in
--       nearly all cases is the full type designated by the access type.
--       The function Designated_Type obtains this full type in the case of
--       access to an incomplete type.

--    Discard_Names (Flag88)
--       Present in types and exception entities. Set if pragma Discard_Names
--       applies to the entity. It is also set for declarative regions and
--       package specs for which a Discard_Names pragma with zero arguments
--       has been encountered. The purpose of setting this flag is to be able
--       to set the Discard_Names attribute on enumeration types declared
--       after the pragma within the same declarative region. This flag is
--       set to False if a Keep_Names pragma appears for an enumeration type.

--    Discriminal (Node17)
--       Present in discriminants (Discriminant formal: GNAT's first
--       coinage). The entity used as a formal parameter that corresponds
--       to a discriminant. See section "Handling of Discriminants" for
--       full details of the use of discriminals.

--    Discriminal_Link (Node10)
--       Present in discriminals (which have an Ekind of E_In_Parameter,
--       or E_Constant), points back to corresponding discriminant.

--    Discriminant_Checking_Func (Node20)
--       Present in components. Points to the defining identifier of the
--       function built by the expander returns a Boolean indicating whether
--       the given record component exists for the current discriminant
--       values.

--    Discriminant_Constraint (Elist21)
--       Present in entities whose Has_Discriminants flag is set (concurrent
--       types, subtypes, record types and subtypes, private types and
--       subtypes, limited private types and subtypes and incomplete types).
--       It is an error to reference the Discriminant_Constraint field if
--       Has_Discriminants is False.
--
--       If the Is_Constrained flag is set, Discriminant_Constraint points
--       to an element list containing the discriminant constraints in the
--       same order in which the discriminants are declared.
--
--       If the Is_Constrained flag is not set but the discriminants of the
--       unconstrained type have default initial values then this field
--       points to an element list giving these default initial values in
--       the same order in which the discriminants are declared. Note that
--       in this case the entity cannot be a tagged record type, because
--       discriminants in this case cannot have defaults.
--
--       If the entity is a tagged record implicit type, then this field is
--       inherited from the first subtype (so that the itype is subtype
--       conformant with its first subtype, which is needed when the first
--       subtype overrides primitive operations inherited by the implicit
--       base type).
--
--       In all other cases Discriminant_Constraint contains the empty
--       Elist (ie it is initialized with a call to New_Elmt_List).

--    Discriminant_Default_Value (Node20)
--       Present in discriminants. Points to the node representing the
--       expression for the default value of the discriminant. Set to
--       Empty if the discriminant has no default value.

--    Discriminant_Number (Uint15)
--       Present in discriminants. Gives the ranking of a discriminant in
--       the list of discriminants of the type, i.e. a sequential integer
--       index starting at 1 and ranging up to Number_Discriminants.

--    DTC_Entity (Node16)
--       Present in function and procedure entities. Set to Empty unless
--       the subprogram is dispatching in which case it references the
--       Dispatch Table pointer Component. That is to say the component _tag
--       for regular Ada tagged types, for CPP_Class types and their
--       descendants this field points to the component entity in the record
--       that is the Vtable pointer for the Vtable containing the entry that
--       references the subprogram.

--    DT_Entry_Count (Uint15)
--       Present in E_Component entities. Only used for component marked
--       Is_Tag. Store the number of entries in the Vtable (or Dispatch Table)

--    DT_Position (Uint15)
--       Present in function and procedure entities which are dispatching
--       (should not be referenced without first checking that flag
--       Is_Dispatching_Operation is True). Contains the offset into
--       the Vtable for the entry that references the subprogram.

--    Ekind (Ekind)
--       Present in all entities. Contains a value of the enumeration type
--       Entity_Kind declared in a subsequent section in this spec.

--    Elaborate_All_Desirable (Flag146)
--       Present in package and subprogram entities, and in generic package
--       and subprogram entities. Set if internal analysis of a client that
--       with's this unit determines that Elaborate_All is desirable, i.e.
--       that there is a possibility that Program_Error may be raised if
--       Elaborate_All conditions cannot be met.

--    Elaboration_Entity (Node13)
--       Present in generic and non-generic package and subprogram
--       entities. This is a boolean entity associated with the unit that
--       is initiallly set to False, and is set True when the unit is
--       elaborated. This is used for two purposes. First, it is used to
--       implement required access before elaboration checks (the flag
--       must be true to call a subprogram at elaboration time). Second,
--       it is used to guard against repeated execution of the generated
--       elaboration code.
--
--       Note that we always allocate this flag, and set this field, but
--       we do not always actually use it. It is only used if it is needed
--       for access-before-elaboration use (see Elaboration_Entity_Required
--       flag) or if either the spec or the body has elaboration code. If
--       neither of these two conditions holds, then the entity is still
--       allocated (since we don't know early enough whether or not there
--       is elaboration code), but is simply not used for any purpose.

--    Elaboration_Entity_Required (Flag174)
--       Present in generics and non-generic package and subprogram
--       entities. Set only if Elaboration_Entity is non-Empty to indicate
--       that the boolean is required to be set even if there is no other
--       elaboration code. This occurs when the Elaboration_Entity flag
--       is used for required access-before-elaboration checking. If the
--       flag is only for preventing multiple execution of the elaboration
--       code, then if there is no other elaboration code, obviously there
--       is no need to set the flag.

--    Enclosing_Dynamic_Scope (synthesized)
--      Appliesa to all entities. Returns the closest dynamic scope in which
--      the entity is declared or Standard_Standard for library-level entities

--    Enclosing_Scope (Node18)
--       Present in labels. Denotes the innermost enclosing construct that
--       contains the label. Identical to the scope of the label, except for
--       labels declared in the body of an accept statement, in which case the
--       entry_name is the Enclosing_Scope. Used to validate goto's within
--       accept statements.

--    Entry_Accepted (Flag152)
--       Present in E_Entry and E_Entry_Family entities. Set if there is
--       at least one accept for this entry in the task body. Used to
--       generate warnings for missing accepts.

--    Entry_Bodies_Array (Node15)
--       Present in protected types for which Has_Entries is true.
--       This is the defining identifier for the array of entry body
--       action procedures and barrier functions used by the runtime to
--       execute the user code associated with each entry.

--    Entry_Cancel_Parameter (Node23)
--       Present in blocks. This only applies to a block statement for
--       which the Is_Asynchronous_Call_Block flag is set. It
--       contains the defining identifier of an object that must be
--       passed to the Cancel_Task_Entry_Call or Cancel_Protected_Entry_Call
--       call in the cleanup handler added to the block by
--       Exp_Ch7.Expand_Cleanup_Actions. This parameter is a Boolean
--       object for task entry calls and a Communications_Block object
--       in the case of protected entry calls. In both cases the objects
--       are declared in outer scopes to this block.

--    Entry_Component (Node11)
--       Present in formal parameters (in, in out and out parameters). Used
--       only for formals of entries. References the corresponding component
--       of the entry parameter record for the entry.

--    Entry_Formal (Node16)
--       Present in components of the record built to correspond to entry
--       parameters. This field points from the component to the formal. It
--       is the back pointer corresponding to Entry_Component.

--    Entry_Index_Constant (Node18)
--       Present in an entry index parameter. This is an identifier that
--       eventually becomes the name of a constant representing the index
--       of the entry family member whose entry body is being executed. Used
--       to expand references to the entry index specification identifier.

--    Entry_Index_Type (synthesized)
--       Applies to an entry family. Denotes Etype of the subtype indication
--       in the entry declaration. Used to resolve the index expression in an
--       accept statement for a member of the family, and in the prefix of
--       'COUNT when it applies to a family member.

--    Entry_Parameters_Type (Node15)
--       Present in entries. Points to the access-to-record type that is
--       constructed by the expander to hold a reference to the parameter
--       values. This reference is manipulated (as an address) by the
--       tasking runtime. The designated record represents a packaging
--       up of the entry parameters (see Exp_Ch9.Expand_N_Entry_Declaration
--       for further details). Entry_Parameters_Type is Empty if the entry
--       has no parameters.

--    Enumeration_Pos (Uint11)
--       Present in enumeration literals. Contains the position number
--       corresponding to the value of the enumeration literal.

--    Enumeration_Rep (Uint12)
--       Present in enumeration literals. Contains the representation that
--       corresponds to the value of the enumeration literal. Note that
--       this is normally the same as Enumeration_Pos except in the presence
--       of representation clauses, where Pos will still represent the
--       position of the literal within the type and Rep will have be the
--       value given in the representation clause.

--    Enumeration_Rep_Expr (Node22)
--       Present in enumeration literals. Points to the expression in an
--       associated enumeration rep clause that provides the representation
--       value for this literal. Empty if no enumeration rep clause for this
--       literal (or if rep clause does not have an entry for this literal,
--       an error situation). This is also used to catch duplicate entries
--       for the same literal.

--    Enum_Pos_To_Rep (Node23)
--       Present in enumeration types (but not enumeration subtypes). Set to
--       Empty unless the enumeration type has a non-standard representation
--       (i.e. at least one literal has a representation value different from
--       its pos value). In this case, Enum_Pos_To_Rep is the entity for an
--       array constructed when the type is frozen that maps Pos values to
--       corresponding Rep values. The index type of this array is Natural,
--       and the component type is a suitable integer type that holds the
--       full range of representation values.

--    Equivalent_Type (Node18)
--       Present in class wide types and subtypes, access to protected
--       subprogram types, and in exception_types. For a classwide type, it
--       is always Empty. For a class wide subtype, it points to an entity
--       created by the expander which gives Gigi an easily understandable
--       equivalent of the class subtype with a known size (given by an
--       initial value). See Exp_Util.Expand_Class_Wide_Subtype for further
--       details. For E_exception_type, this points to the record containing
--       the data necessary to represent exceptions (for further details, see
--       System.Standard_Library. For access_to_protected subprograms, it
--       denotes a record that holds pointers to the operation and to the
--       protected object. For remote Access_To_Subprogram types, it denotes
--       the record that is the fat pointer representation of an RAST.

--    Esize (Uint12)
--       Present in all types and subtypes, and also for components, constants,
--       and variables. Contains the Object_Size of the type or of the object.
--       A value of zero indicates that the value is not yet known.
--
--       For the case of components where a component clause is present, the
--       value is the value from the component clause, which must be non-
--       negative (but may be zero, which is acceptable for the case of
--       a type with only one possible value). It is also possible for Esize
--       of a component to be set without a component clause present, which
--       means that the component size is specified, but not the position.
--       See also RM_Size and the section on "Handling of Type'Size Values".
--       During gigi processing, the value is back annotated for all zero
--       values, so that after the call to gigi, the value is properly set.

--    Etype (Node5)
--       Present in all entities. Represents the type of the entity, which
--       is itself another entity. For a type entity, points to the parent
--       type for a derived type, or if the type is not derived, points to
--       itself. For a subtype entity, Etype points to the base type. For
--       a class wide type, points to the parent type. For a subprogram or
--       subprogram type, Etype has the return type of a function or is set
--       to Standard_Void_Type to represent a procedure.

--    Exception_Code (Uint22)
--       Present in exception entitites. Set to zero unless either an
--       Import_Exception or Export_Exception pragma applies to the
--       pragma and specifies a Code value. See description of these
--       pragmas for details. Note that this field is relevant only if
--       Is_VMS_Exception is set.

--    Extra_Formal (Node15)
--       Present in formal parameters in the non-generic case. Certain
--       parameters require extra implicit information to be passed
--       (e.g. the flag indicating if an unconstrained variant record
--       argument is constrained, and the accessibility level for
--       access parameters. See description of Extra_Constrained,
--       Extra_Accessibility fields for further details. Extra formal
--       parameters are constructed to represent these values, and
--       chained to the end of the list of formals using the
--       Extra_Formal field (i.e. the Extra_Formal field of the last
--       "real" formal points to the first extra formal, and the
--       Extra_Formal field of each extra formal points to the next
--       one, with Empty indicating the end of the list of extra
--       formals.

--    Extra_Accessibility (Node13)
--       Present in formal parameters in the non-generic case if
--       expansion is active. Normally Empty, but if a parameter is
--       one for which a dynamic accessibility check is required, then
--       an extra formal of type Natural is created (see description
--       of field Extra_Formal), and the Extra_Accessibility field of
--       the formal parameter points to the entity for this extra
--       formal. Also present in variables when compiling receiving
--       stubs. In this case, a non Empty value means that this
--       variable's accessibility depth has been transmitted by the
--       caller and must be retrieved through the entity designed by
--       this field instead of being computed.

--    Extra_Constrained (Node23)
--       Present in formal parameters in the non-generic case if
--       expansion is active. Normally Empty, but if a parameter is
--       one for which a dynamic indication of its constrained status
--       is required, then an extra formal of type Boolean is created
--       (see description of field Extra_Formal), and the
--       Extra_Constrained field of the formal parameter points to the
--       entity for this extra formal. Also present in variables when
--       compiling receiving stubs. In this case, a non empty value
--       means that this variable's constrained status has been
--       transmitted by the caller and must be retrieved through the
--       entity designed by this field instead of being computed.

--    Finalization_Chain_Entity (Node19)
--       Present in scopes which can have finalizable entities (blocks,
--       functions, procedures, tasks, entries). When this field is empty it
--       means that there are no finalization actions to perform on exit of the
--       scope. When this field contains 'Error', it means that no
--       finalization actions should happen at this level and the
--       finalization chain of a parent scope shall be used (??? this is
--       an improper use of 'Error' and should be changed). otherwise it
--       contains an entity of type Finalizable_Ptr that is the head of the
--       list of objects to finalize on exit. See "Finalization Management"
--       section in exp_ch7.adb for more details.

--    Finalize_Storage_Only (Flag158) [base type only]
--       Present in all types. Set on direct controlled types to which a
--       valid Finalize_Storage_Only pragma applies. This flag is also set on
--       composite types when they have at least one controlled component and
--       all their controlled components are Finalize_Storage_Only. It is also
--       inherited by type derivation except for direct controlled types where
--       the Finalize_Storage_Only pragma is required at each level of
--       derivation.

--    First_Component (synthesized)
--       Applies to record types. Returns the first component by following
--       the chain of declared entities for the record until a component
--       is found (one with an Ekind of E_Component). The discriminants are
--       skipped. If the record is null, then Empty is returned.

--    First_Discriminant (synthesized)
--       Applies to types with discriminants. The discriminants are the
--       first entities declared in the type, so normally this is equivalent
--       to First_Entity. The exception arises for tagged types, where the
--       tag itself is prepended to the front of the entity chain, so the
--       First_Discriminant function steps past the tag if it is present.

--    First_Entity (Node17)
--       Present in all entities which act as scopes to which a list of
--       associated entities is attached (blocks, class subtypes and types,
--       entries, functions, loops, packages, procedures, protected objects,
--       record types and subtypes, private types, task types and subtypes).
--       Points to a list of associated entities using the Next_Entity field
--       as a chain pointer with Empty marking the end of the list.

--    First_Formal (synthesized)
--       Applies to subprograms and subprogram types, and also in entries
--       and entry families. Returns first formal of the subprogram or entry.
--       The formals are the first entities declared in a subprogram or in
--       a subprogram type (the designated type of an Access_To_Subprogram
--       definition) or in an entry.

--    First_Index (Node17)
--       Present in array types and subtypes and in string types and subtypes.
--       By introducing implicit subtypes for the index constraints, we have
--       the same structure for constrained and unconstrained arrays, subtype
--       marks and discrete ranges are both represented by a subtype. This
--       function returns the tree node corresponding to an occurrence of the
--       first index (NOT the entity for the type). Subsequent indexes are
--       obtained using Next_Index. Note that this field is present for the
--       case of string literal subtypes, but is always Empty.

--    First_Literal (Node17)
--       Present in all enumeration types, including character and boolean
--       types. This field points to the first enumeration literal entity
--       for the type (i.e. it is set to First (Literals (N)) where N is
--       the enumeration type definition node. A special case occurs with
--       standard character and wide character types, where this field is
--       Empty, since there are no enumeration literal lists in these cases.
--       Note that this field is set in enumeration subtypes, but it still
--       points to the first literal of the base type in this case.

--    First_Optional_Parameter (Node14)
--       Present in (non-generic) function and procedure entities. Set to a
--       non-null value only if a pragma Import_Function, Import_Procedure
--       or Import_Valued_Procedure specifies a First_Optional_Parameter
--       argument, in which case this field points to the parameter entity
--       corresponding to the specified parameter.

--    First_Private_Entity (Node16)
--       Present in all entities containing private parts (packages,
--       protected types and subtypes, task types and subtypes). The
--       entities on the entity chain are in order of declaration, so the
--       entries for private entities are at the end of the chain. This
--       field points to the first entity for the private part. It is
--       Empty if there are no entities declared in the private part or
--       if there is no private part.

--    First_Rep_Item (Node6)
--       Present in all entities. If non-empty, points to a linked list of
--       representation pragmas nodes and representation clause nodes that
--       apply to the entity, linked using Next_Rep_Item, with Empty marking
--       the end of the list. In the case of derived types and subtypes, the
--       new entity inherits the chain at the point of declaration. This
--       means that it is possible to have multiple instances of the same
--       kind of rep item on the chain, in which case it is the first one
--       that applies to the entity.
--
--       For most representation items, the representation information is
--       reflected in other fields and flags in the entity. For example if
--       a record representation clause is present, the component entities
--       reflect the specified information. However, there are some items
--       that are only reflected in the chain. These include:
--
--          Alignment attribute definition clause
--          Machine_Attribute pragma
--          Link_Alias pragma
--          Link-Section pragma
--          Weak_External pragma
--
--       If any of these items are present, then the flag Has_Gigi_Rep_Item
--       is set, indicating that Gigi should search the chain.
--
--       Other representation items are included in the chain so that error
--       messages can easily locate the relevant nodes for posting errors.
--       Note in particular that size clauses are present only for this
--       purpose, and should only be accessed if Has_Size_Clause is set.

--    First_Stored_Discriminant (synthesized)
--       Applies to types with discriminants. Gives the first discriminant
--       stored in the object. In many cases, these are the same as the
--       normal visible discriminants for the type, but in the case of
--       renamed discriminants, this is not always the case.
--
--       For tagged types, and untagged types which are root types or
--       derived types but which do not rename discriminants in their
--       root type, the stored discriminants are the same as the actual
--       discriminants of the type, and hence this function is the same
--       as First_Discriminant.
--
--       For derived non-tagged types that rename discriminants in the root
--       type this is the first of the discriminants that occurr in the
--       root type. To be precise, in this case stored discriminants are
--       entities attached to the entity chain of the derived type which
--       are a copy of the discriminants of the root type. Furthermore their
--       Is_Completely_Hidden flag is set since although they are actually
--       stored in the object, they are not in the set of discriminants that
--       is visble in the type.
--
--       For derived untagged types, stored discriminants are the real
--       discriminants from Gigi's standpoint, i.e. those that will be
--       stored in actual objects of the type.

--    First_Subtype (synthesized)
--       Applies to all types and subtypes. For types, yields the first
--       subtype of the type. For subtypes, yields the first subtype of
--       the base type of the subtype.

--    Freeze_Node (Node7)
--       Present in all entities. If there is an associated freeze node for
--       the entity, this field references this freeze node. If no freeze
--       node is associated with the entity, then this field is Empty. See
--       package Freeze for further details.

--    From_With_Type (Flag159)
--       Present in package and type entities. Indicates that the entity
--       appears in a With_Type clause in the context of some other unit,
--       either as the prefix (which must be a package), or as a type name.
--       The package can only be used to retrieve such a type, and the type
--       can be used only in component declarations and access definitions.
--       The With_Type clause is used to construct mutually recursive
--       types, i.e. record types (Java classes) that hold pointers to each
--       other. If such a type is an access type, it has no explicit freeze
--       node, so that the back-end does not attempt to elaborate it.
--       Currently this flag is also used to implement Ada 2005 (AI-50217).
--       It will be renamed to From_Limited_With after removal of the current
--       GNAT with_type clause???

--    Full_View (Node11)
--       Present in all type and subtype entities and in deferred constants.
--       References the entity for the corresponding full type declaration.
--       For all types other than private and incomplete types, this field
--       always contains Empty. See also Underlying_Type.

--    Function_Returns_With_DSP (Flag169)
--       Present in all subprogram entities, and type entities for access
--       to subprogram values. Set True if the function (or referenced
--       function in the case of an access value) returns with using the
--       DSP (depressed stack pointer) approach. This can only be set
--       True if Targparm.Functions_Return_By_DSP_On_Target is True and
--       the function returns a value of a type whose size is not known
--       at compile time.

--    Generic_Homonym (Node11)
--       Present in generic packages. The generic homonym is the entity of
--       a renaming declaration inserted in every generic unit. It is used
--       to resolve the name of a local entity that is given by a qualified
--       name, when the generic entity itself is hidden by a local name.

--    Generic_Renamings (Elist23)
--       Present in package and subprogram instances. Holds mapping that
--       associates generic parameters with the corresponding instances, in
--       those cases where the instance is an entity.

--    Handler_Records (List10)
--       Present in subprogram and package entities. Points to a list of
--       identifiers referencing the handler record entities for the
--       corresponding unit.

--    Has_Aliased_Components (Flag135) [implementation base type only]
--       Present in array type entities. Indicates that the component type
--       of the array is aliased.

--    Has_Alignment_Clause (Flag46)
--       Present in all type entities and objects. Indicates if an alignment
--       clause has been given for the entity. If set, then Alignment_Clause
--       returns the N_Attribute_Definition node for the alignment attribute
--       definition clause. Note that it is possible for this flag to be False
--       even when Alignment_Clause returns non_Empty (this happens in the case
--       of derived type declarations).

--    Has_All_Calls_Remote (Flag79)
--       Present in all library unit entities. Set true if the library unit
--       has an All_Calls_Remote pragma. Note that such entities must also
--       be RCI entities, so the flag Is_Remote_Call_Interface will always
--       be set if this flag is set.

--    Has_Atomic_Components (Flag86) [implementation base type only]
--       Present in all types and objects. Set only for an array type or
--       an array object if a valid pragma Atomic_Components applies to the
--       type or object. Note that in the case of an object, this flag is
--       only set on the object if there was an explicit pragma for the
--       object. In other words, the proper test for whether an object has
--       atomic components is to see if either the object or its base type
--       has this flag set. Note that in the case of a type, the pragma will
--       be chained to the rep item chain of the first subtype in the usual
--       manner.

--    Has_Attach_Handler (synthesized)
--       Applies to record types that are constructed by the expander to
--       represent protected types. Returns True if there is at least one
--       Attach_Handler pragma in the corresponding specification.

--    Has_Biased_Representation (Flag139)
--       Present in discrete types (where it applies to the type'size value),
--       and to objects (both stand-alone and components), where it applies to
--       the size of the object from a size or record component clause. In
--       all cases it indicates that the size in question is smaller than
--       would normally be required, but that the size requirement can be
--       satisfied by using a biased representation, in which stored values
--       have the low bound (Expr_Value (Type_Low_Bound (T)) subtracted to
--       reduce the required size. For example, a type with a range of 1..2
--       takes one bit, using 0 to represent 1 and 1 to represent 2.
--
--       Note that in the object and component cases, the flag is only set
--       if the type is unbiased, but the object specifies a smaller size
--       than the size of the type, forcing biased representation for the
--       object, but the subtype is still an unbiased type.

--    Has_Completion (Flag26)
--       Present in all entities that require a completion (functions,
--       procedures, private types, limited private types, incomplete types,
--       constants and packages that require a body). The flag is set if the
--       completion has been encountered and analyzed.

--    Has_Completion_In_Body (Flag71)
--       Present in  "Taft amendment types" that is to say incomplete types
--       whose full declaration appears in the package body.

--    Has_Complex_Representation (Flag140) [implementation base type only]
--       Present in all type entities. Set only for a record base type to
--       which a valid pragma Complex_Representation applies.

--    Has_Component_Size_Clause (Flag68) [implementation base type only]
--       Present in all type entities. Set if a component size clause is
--       present for the given type. Note that this flag can be False even
--       if Component_Size is non-zero (happens in the case of derived types).

--    Has_Contiguous_Rep (Flag181)
--       Present in enumeration types. True if the type as a representation
--       clause whose entries are successive integers.

--    Has_Controlling_Result (Flag98)
--       Present in E_Function entities. True if The function is a primitive
--       function of a tagged type which can dispatch on result

--    Has_Controlled_Component (Flag43) [base type only]
--       Present in composite type entities. Indicates that the type has a
--       component that either is a controlled type, or itself contains a
--       controlled component (i.e. either Has_Controlled_Component or
--       Is_Controlled is set for at least one component).

--    Has_Convention_Pragma (Flag119)
--       Present in an entity for which a Convention, Import, or Export
--       pragma has been given. Used to prevent more than one such pragma
--       appearing for a given entity (RM B.1(45)).

--    Has_Delayed_Freeze (Flag18)
--       Present in all entities. Set to indicate that an explicit freeze
--       node must be generated for the entity at its freezing point. See
--       separate section ("Delayed Freezing and Elaboration") for details.

--    Has_Discriminants (Flag5)
--       Present in all types and subtypes. For types that are allowed to have
--       discriminants (record types and subtypes, task types and subtypes,
--       protected types and subtypes, private types, limited private types,
--       and incomplete types), indicates if the corresponding type or subtype
--       has a known discriminant part. Always false for all other types.

--    Has_Entries (synthesized)
--       Applies to concurrent types. True if any entries are declared
--       within the task or protected definition for the type.

--    Has_Enumeration_Rep_Clause (Flag66)
--       Present in enumeration types. Set if an enumeration representation
--       clause has been given for this enumeration type. Used to prevent more
--       than one enumeration representation clause for a given type. Note
--       that this does not imply a representation with holes, since the rep
--       clause may merely confirm the default 0..N representation.

--    Has_External_Tag_Rep_Clause (Flag110)
--       Present in tagged types. Set if an external_tag rep. clause has been
--       given for this type. Use to avoid the generation of the default
--       external_tag.

--    Has_Exit (Flag47)
--       Present in loop entities. Set if the loop contains an exit statement.

--    Has_Foreign_Convention (synthesized)
--       Applies to all entities. Determines if the Convention for the
--       entity is a foreign convention (i.e. is other than Convention_Ada,
--       Convention_Intrinsic, Convention_Entry or Convention_Protected).

--    Has_Forward_Instantiation (Flag175)
--       Present in package entities. Set true for packages that contain
--       instantiations of local generic entities, before the corresponding
--       generic body has been seen. If a package has a forward instantiation,
--       we cannot inline subprograms appearing in the same package because
--       the placement requirements of the instance will conflict with the
--       linear elaboration of front-end inlining.

--    Has_Fully_Qualified_Name (Flag173)
--       Present in all entities. Set True if the name in the Chars field
--       has been replaced by the fully qualified name, as used for debug
--       output. See Exp_Dbug for a full description of the use of this
--       flag and also the related flag Has_Qualified_Name.

--    Has_Gigi_Rep_Item (Flag82)
--       This flag is set if the rep item chain (referenced by First_Rep_Item
--       and linked through the Next_Rep_Item chain contains a representation
--       item that needs to be specially processed by Gigi, i.e. one of the
--       following items:
--
--          Machine_Attribute pragma
--          Linker_Alias pragma
--          Linker_Section pragma
--          Weak_External pragma
--
--       If this flag is set, then Gigi should scan the rep item chain to
--       process any of these items that appear. At least one such item will
--       be present.

--    Has_Homonym (Flag56)
--       Present in all entities. Set if an entity has a homonym in the same
--       scope. Used by Gigi to generate unique names for such entities.

--    Has_Interrupt_Handler (synthesized)
--       Applies to all protected type entities. Set if the protected type
--       definition contains at least one procedure to which a pragma
--       Interrupt_Handler applies.

--    Has_Machine_Radix_Clause (Flag83)
--       Present in decimal types and subtypes, set if a Machine_Radix
--       representation clause is present. This flag is used to detect
--       the error of multiple machine radix clauses for a single type.

--    Has_Master_Entity (Flag21)
--       Present in entities that can appear in the scope stack (see spec
--       of Sem). It is set if a task master entity (_master) has been
--       declared and initialized in the corresponding scope.

--    Has_Missing_Return (Flag142)
--       Present in functions and generic functions. Set if there is one or
--       more missing return statements in the function. This is used to
--       control wrapping of the body in Exp_Ch6 to ensure that the program
--       error exeption is correctly raised in this case at runtime.

--    Has_Nested_Block_With_Handler (Flag101)
--       Present in scope entities. Set if there is a nested block within the
--       scope that has an exception handler and the two scopes are in the
--       same procedure. This is used by the backend for controlling certain
--       optimizations to ensure that they are consistent with exceptions.
--       See documentation in Gigi for further details.

--    Has_Non_Standard_Rep (Flag75) [implementation base type only]
--       Present in all type entities. Set when some representation clause
--       or pragma causes the representation of the item to be significantly
--       modified. In this category are changes of small or radix for a
--       fixed-point type, change of component size for an array, and record
--       or enumeration representation clauses, as well as packed pragmas.
--       All other representation clauses (e.g. Size and Alignment clauses)
--       are not considered to be significant since they do not affect
--       stored bit patterns.

--    Has_Object_Size_Clause (Flag172)
--       Present in entities for types and subtypes. Set if an Object_Size
--       clause has been processed for the type Used to prevent multiple
--       Object_Size clauses for a given entity.

--    Has_Per_Object_Constraint (Flag154)
--       Present in E_Component entities, true if the subtype of the
--       component has a per object constraint. Per object constraints result
--       from the following situations:
--
--       1. N_Attribute_Reference - when the prefix is the enclosing type and
--          the attribute is Access.
--       2. N_Discriminant_Association - when the expression uses the
--          discriminant of the enclosing type.
--       3. N_Index_Or_Discriminant_Constraint - when at least one of the
--          individual constraints is a per object constraint.
--       4. N_Range - when the lower or upper bound uses the discriminant of
--          the enclosing type.
--       5. N_Range_Constraint - when the range expression uses the
--          discriminant of the enclosing type.

--    Has_Pragma_Controlled (Flag27) [implementation base type only]
--       Present in access type entities. It is set if a pragma Controlled
--       applies to the access type.

--    Has_Pragma_Elaborate_Body (Flag150)
--       Present in all entities. Set in compilation unit entities if a
--       pragma Elaborate_Body applies to the compilation unit.

--    Has_Pragma_Inline (Flag157)
--       Present in all entities. Set for functions and procedures for which
--       a pragma Inline or Inline_Always applies to the subprogram. Note
--       that this flag can be set even if Is_Inlined is not set. This
--       happens for pragma Inline (if Inline_Active is False). In other
--       words, the flag Has_Pragma_Inline represents the formal semantic
--       status, and is used for checking semantic correctness.
--       The flag Is_Inlined indicates whether inlining is actually active
--       for the entity.

--    Has_Pragma_Pack (Flag121) [implementation base type only]
--       Present in all entities. It indicates that a valid pragma Pack was
--       was given for the type. Note that this flag is not inherited by a
--       derived type. See also the Is_Packed flag.

--    Has_Pragma_Pure_Function (Flag179)
--       Present in subprogram entities. It indicates that a valid pragma
--       Pure_Function was given for the entity. In some cases, we need to
--       know that Is_Pure was explicitly set using this pragma.

--    Has_Pragma_Unreferenced (Flag180)
--       Present in all entities. Set if a valid pragma Unreferenced applies
--       to the pragma, indicating that no warning should be given if the
--       entity has no references, but a warning should be given if it is
--       in fact referenced.

--    Has_Primitive_Operations (Flag120) [base type only]
--       Present in all type entities. Set if at least one primitive operation
--       is defined for the type.

--    Has_Private_Ancestor (synthesized)
--       Applies to all type and subtype entities. Returns True if at least
--       one ancestor is private, and otherwise False if there are no private
--       ancestors.

--    Has_Private_Declaration (Flag155)
--       Present in all entities. Returns True if it is the defining entity
--       of a private type declaration or its corresponding full declaration.
--       This flag is thus preserved when the full and the partial views are
--       exchanged, to indicate if a full type declaration is a completion.
--       Used for semantic checks in E.4 (18), and elsewhere.

--    Has_Qualified_Name (Flag161)
--       Present in all entities. Set True if the name in the Chars field
--       has been replaced by its qualified name, as used for debug output.
--       See Exp_Dbug for a full description of qualification requirements.
--       For some entities, the name is the fully qualified name, but there
--       are exceptions. In particular, for local variables in procedures,
--       we do not include the procedure itself or higher scopes. See also
--       the flag Has_Fully_Qualified_Name, which is set if the name does
--       indeed include the fully qualified name.

--    Has_Record_Rep_Clause (Flag65) [implementation base type only]
--       Present in record types. Set if a record representation clause has
--       been given for this record type. Used to prevent more than one such
--       clause for a given record type. Note that this is initially cleared
--       for a derived type, even though the representation is inherited. See
--       also the flag Has_Specified_Layout.

--    Has_Recursive_Call (Flag143)
--       Present in procedures. Set if a direct parameterless recursive call
--       is detected while analyzing the body. Used to activate some error
--       checks for infinite recursion.

--    Has_Size_Clause (Flag29)
--       Present in entities for types and objects. Set if a size clause is
--       present for the entity. Used to prevent multiple Size clauses for a
--       given entity. Note that it is always initially cleared for a derived
--       type, even though the Size for such a type is inherited from a Size
--       clause given for the parent type.

--    Has_Small_Clause (Flag67)
--       Present in ordinary fixed point types (but not subtypes). Indicates
--       that a small clause has been given for the entity. Used to prevent
--       multiple Small clauses for a given entity. Note that it is always
--       initially cleared for a derived type, even though the Small for such
--       a type is inherited from a Small clause given for the parent type.

--    Has_Specified_Layout (Flag100) [implementation base type only]
--       Present in all type entities. Set for a record type or subtype if
--       the record layout has been specified by a record representation
--       clause. Note that this differs from the flag Has_Record_Rep_Clause
--       in that it is inherited by a derived type. Has_Record_Rep_Clause is
--       used to indicate that the type is mentioned explicitly in a record
--       representation clause, and thus is not inherited by a derived type.
--       This flag is always False for non-record types.

--    Has_Storage_Size_Clause (Flag23) [implementation base type only]
--       Present in task types and access types. It is set if a Storage_Size
--       clause is present for the type. Used to prevent multiple clauses for
--       one type. Note that this flag is initially cleared for a derived type
--       even though the Storage_Size for such a type is inherited from a
--       Storage_Size clause given for the parent type. Note that in the case
--       of access types, this flag is present only in the root type, since a
--       storage size clause cannot be given to a derived type.

--    Has_Stream_Size_Clause (Flag184)
--       This flag is set on types which have a Stream_Size clause attribute.
--       Used to prevent multiple Stream_Size clauses for a given entity.

--    Has_Subprogram_Descriptor (Flag93)
--       This flag is set on entities for which zero-cost exception subprogram
--       descriptors can be generated (subprograms and library level package
--       declarations and bodies). It indicates that a subprogram descriptor
--       has been generated, and is used to suppress generation of multiple
--       descriptors (e.g. when instantiating generic bodies).

--    Has_Task (Flag30) [base type only]
--       Present in all type entities. Set on task types themselves, and also
--       (recursively) on any composite type which has a component for which
--       Has_Task is set. The meaning is that an allocator of such an object
--       must create the required tasks. Note that the flag is not set on
--       access types, even if they designate an object that Has_Task.

--    Has_Unchecked_Union (Flag123) [base type only]
--       Present in all type entities. Set on unchecked unions themselves
--       and (recursively) on any composite type which has a component for
--       which Has_Unchecked_Union is set. The meaning is that a comparison
--       operation for the type is not permitted. Note that the flag is not
--       set on access types, even if they designate an object that has
--       the flag Has_Unchecked_Union set.

--    Has_Unknown_Discriminants (Flag72)
--       Present in all type entities. Types can have unknown discriminants
--       either from their declaration or through type derivation. The use
--       of this flag exactly meets the spec in RM 3.7(26). Note that all
--       class-wide types are considered to have unknown discriminants.
--       Note that both Has_Discriminants and Has_Unknown_Discriminants may
--       be true for a type. Class-wide types and their subtypes have
--       unknown discriminants and can have declared ones as well. Private
--       types declared with unknown discriminants may have a full view that
--       has explicit discriminants, and both flag will be set on the partial
--       view, to insure that discriminants are properly inherited in certain
--       contexts.

--    Has_Volatile_Components (Flag87) [implementation base type only]
--       Present in all types and objects. Set only for an array type or
--       array object if a valid pragma Volatile_Components or a valid
--       pragma Atomic_Components applies to the type or object. Note that
--       in the case of an object, this flag is only set on the object if
--       there was an explicit pragma for the object. In other words, the
--       proper test for whether an object has volatile components is to
--       see if either the object or its base type has this flag set. Note
--       that in the case of a type the pragma will be chained to the rep
--       item chain of the first subtype in the usual manner.

--    Has_Xref_Entry (Flag182)
--       This flag is set if an entity has an entry in the Xref information
--       generated in ali files. This is true for all source entities in the
--       extended main source file. It is also true of entities in other
--       packages that are referenced directly or indirectly from the main
--       source file (indirect reference occurs when the main source file
--       references an entity with a type reference. See package Lib.Xref
--       for further details).

--    Hiding_Loop_Variable (Node8)
--       Present in variables. Set only if a variable of a discrete type is
--       hidden by a loop variable in the same local scope, in which case
--       the Hiding_Loop_Variable field of the hidden variable points to
--       the E_Loop_Parameter entity doing the hiding. Used in processing
--       warning messages if the hidden variable turns out to be unused
--       or is referenced without being set.

--    Homonym (Node4)
--       Present in all entities. Link for list of entities that have the
--       same source name and that are declared in the same or enclosing
--       scopes. Homonyms in the same scope are overloaded. Used for name
--       resolution and for the generation of debugging information.

--    Implementation_Base_Type (synthesized)
--       Applies to all types. Similar to Base_Type, but never returns a
--       private type when applied to a non-private type. Instead in this
--       case, it always returns the Representation_Type of the base type
--       in this case, so that we still have a concrete type. Note: it is
--       allowed to apply Implementation_Base_Type to other than a type,
--       in which case it simply returns the entity unchanged.

--    In_Package_Body (Flag48)
--       Set on the entity that denotes the package (the defining occurrence
--       of the package declaration) while analyzing and expanding the package
--       body. Reset on completion of analysis/expansion.

--    In_Private_Part (Flag45)
--       Present in package entities. Flag is set to indicate that the
--       private part is being analyzed. The flag is reset at the end of the
--       package declaration.

--    Inner_Instances (Elist23)
--      Present in generic units. Contains element list of units that are
--      instantiated within the given generic. Used to diagnose circular
--      instantiations.

--    Interface_Name (Node21)
--       Present in exceptions, functions, procedures, variables, constants,
--       and packages. Set to Empty unless an export, import, or interface
--       name pragma has explicitly specified an external name, in which
--       case it references an N_String_Literal node for the specified
--       external name. In the case of exceptions, the field is set by
--       Import_Exception/Export_Exception (which can be used in OpenVMS
--       versions only). Note that if this field is Empty, and Is_Imported
--       or Is_Exported is set, then the default interface name is the name
--       of the entity, cased in a manner that is appropriate to the system
--       in use. Note that Interface_Name is ignored if an address clause
--       is present (since it is meaningless in this case).
--
--       An additional special case usage of this field is in JGNAT for
--       E_Component and E_Discriminant. JGNAT allows these entities to
--       be imported by specifying pragma Import within a component's
--       containing record definition. This supports interfacing to
--       object fields defined within Java classes, and such pragmas
--       are generated by the jvm2ada binding generator tool whenever
--       it processes classes with public object fields. A pragma Import
--       for a component can define the External_Name of the imported
--       Java field (which is generally needed, because Java names are
--       case sensitive).
--
--    In_Use (Flag8)
--       Present in packages and types. Set when analyzing a use clause for
--       the corresponding entity. Reset at end of corresponding declarative
--       part. The flag on a type is also used to determine the visibility of
--       the primitive operators of the type.

--    Is_Abstract (Flag19)
--       Present in all types, and also for functions and procedures. Set
--       for abstract types and abstract subprograms.

--    Is_Access_Constant (Flag69)
--       Present in access types and subtypes. Indicates that the keyword
--       constant was present in the access type definition.

--    Is_Access_Type (synthesized)
--       Applies to all entities, true for access types and subtypes

--    Is_Ada_2005 (Flag185)
--       Applies to all entities, true if a valid pragma Ada_05 applies to the
--       entity, indicating that the entity is Ada 2005 only.

--    Is_Aliased (Flag15)
--       Present in objects whose declarations carry the keyword aliased,
--       and on record components that have the keyword.

--    Is_Always_Inlined (synthesized)
--       Present in subprograms. True if there is a pragma Inline_Always for
--       the subprogram.

--    Is_AST_Entry (Flag132)
--       Present in entry entities. Set if a valid pragma AST_Entry applies
--       to the entry. This flag can only be set in OpenVMS versions of GNAT.
--       Note: we also allow the flag to appear in entry families, but given
--       the current implementation of the pragma AST_Entry, this flag will
--       always be False in entry families.

--    Is_Atomic (Flag85)
--       Present in all type entities, and also in constants, components and
--       variables. Set if a pragma Atomic or Shared applies to the entity.
--       In the case of private and incomplete types, this flag is set in
--       both the partial view and the full view.

--    Is_Array_Type (synthesized)
--       Applies to all entities, true for array types and subtypes

--    Is_Asynchronous (Flag81)
--       Present in all type entities and in procedure entities. Set
--       if a pragma Asynchronous applies to the entity.

--    Is_Bit_Packed_Array (Flag122) [implementation base type only]
--       Present in all entities. This flag is set for a packed array
--       type that is bit packed (i.e. the component size is known by the
--       front end and is in the range 1-7, 9-15, 17-31, or 33-63). Is_Packed
--       is always set if Is_Bit_Packed_Array is set, but it is possible for
--       Is_Packed to be set without Is_Bit_Packed_Array for the case of an
--       array having one or more index types that are enumeration types
--       with non-standard enumeration representations.

--    Is_Boolean_Type (synthesized)
--       Applies to all entities, true for boolean types and subtypes,
--       i.e. Standard.Boolean and all types ultimately derived from it.

--    Is_By_Copy_Type (synthesized)
--       Applies to all type entities. Returns true if the entity is
--       a by copy type (RM 6.2(3)).

--    Is_By_Reference_Type (synthesized)
--       Applies to all type entities. True if the type is required to
--       be passed by reference, as defined in (RM 6.2(4-9)).

--    Is_Called (Flag102)
--       Present in subprograms. Returns true if the subprogram is called
--       in the unit being compiled or in a unit in the context. Used for
--       inlining.

--    Is_Character_Type (Flag63)
--       Present in all entities, true for character types and subtypes,
--       i.e. enumeration types that have at least one character literal.

--    Is_Child_Unit (Flag73)
--       Present in all entities. Set only for defining entities of program
--       units that are child units (but False for subunits).

--    Is_Class_Wide_Type (synthesized)
--       Applies to all entities, true for class wide types and subtypes

--    Is_Class_Wide_Equivalent_Type (Flag35)
--       Present in record types and subtypes. Set to True, if the type acts
--       as a class-wide equivalent type, i.e. the Equivalent_Type field of
--       some class-wide subtype entity references this record type.

--    Is_Compilation_Unit (Flag149)
--       Present in all entities. Set if the entity is a package or subprogram
--       entity for a compilation unit other than a subunit (since we treat
--       subunits as part of the same compilation operation as the ultimate
--       parent, we do not consider them to be separate units for this flag).

--    Is_Completely_Hidden (Flag103)
--       A flag set on an E_Discriminant entity. This flag can be set only
--       for girder discriminants of untagged types. When set, the entity
--       is a girder discriminant of a derived untagged type which is not
--       directly visible in the derived type because the derived type or
--       one of its ancestors have renamed the discriminants in the root
--       type. Note that there are girder discriminants which are not
--       Completely_Hidden (e.g. the discriminants of a root type).

--    Is_Composite_Type (synthesized)
--       Applies to all entities, true for all composite types and
--       subtypes. Either Is_Composite_Type or Is_Elementary_Type (but
--       not both) is true of any type.

--    Is_Concurrent_Record_Type (Flag20)
--       Present in record types and subtypes. Set if the type was created
--       by the expander to represent a task or protected type. For every
--       concurrent type, such as record type is constructed, and task and
--       protected objects are instances of this record type at runtime
--       (Gigi will replace declarations of the concurrent type using the
--       declarations of the corresponding record type). See package Exp_Ch9
--       for further details.

--    Is_Concurrent_Type (synthesized)
--       Applies to all entities, true for task types and subtypes and
--       for protected types and subtypes.

--    Is_Constrained (Flag12)
--       Present in types or subtypes which may have index, discriminant
--       or range constraint (i.e. array types and subtypes, record types
--       and subtypes, string types and subtypes, and all numeric types).
--       Set if the type or subtype is constrained.

--    Is_Constr_Subt_For_U_Nominal (Flag80)
--       Present in all types and subtypes. Set true only for the constructed
--       subtype of an object whose nominal subtype is unconstrained. Note
--       that the constructed subtype itself will be constrained.

--    Is_Constr_Subt_For_UN_Aliased (Flag141)
--       This flag can only be set if Is_Constr_Subt_For_U_Nominal is set. It
--       indicates that in addition the object concerned is aliased. This flag
--       is used by Gigi to determine whether a template must be constructed.

--    Is_Constructor (Flag76)
--       Present in function and procedure entities. Set if a pragma
--       CPP_Constructor applies to the subprogram.

--    Is_Controlled (Flag42) [base type only]
--       Present in all type entities. Indicates that the type is controlled,
--       i.e. is either a descendant of Ada.Finalization.Controlled or of
--       Ada.Finalization.Limited_Controlled.

--    Is_Controlling_Formal (Flag97)
--       Present in all Formal_Kind entity. Marks the controlling parameters
--       of dispatching operations.

--    Is_CPP_Class (Flag74)
--       Present in all type entities, set only for tagged and untagged
--       record types to which the pragma CPP_Class has been applied.

--    Is_Decimal_Fixed_Point_Type (synthesized)
--       Applies to all type entities, true for decimal fixed point
--       types and subtypes.

--    Is_Derived_Type (synthesized)
--       Applies to all type entities. Determine if given entity is a
--       derived type

--    Is_Discrete_Type (synthesized)
--       Applies to all entities, true for all discrete types and subtypes

--    Is_Discrete__Or_Fixed_Point_Type (synthesized)
--       Applies to all entities, true for all discrete types and subtypes
--       and all fixed-point types and subtypes.

--    Is_Discrim_SO_Function (Flag176)
--       Present in all entities, set only in E_Function entities that Layout
--       creates to compute discriminant-dependent dynamic size/offset values.

--    Is_Dispatching_Operation (Flag6)
--       Present in all entities. Set true for procedures, functions,
--       generic procedures and generic functions if the corresponding
--       operation is dispatching.

--    Is_Dynamic_Scope (synthesized)
--       Applies to all Entities. Returns True if the entity is a dynamic
--       scope (i.e. a block, a subprogram a task_type or an entry).

--    Is_Elementary_Type (synthesized)
--       Applies to all entities, true for all elementary types and
--       subtypes. Either Is_Composite_Type or Is_Elementary_Type (but
--       not both) is true of any type.

--    Is_Eliminated (Flag124)
--       Present in type entities, subprogram entities, and object entities.
--       Indicates that the corresponding entity has been eliminated by use
--       of pragma Eliminate. Also used to mark subprogram entities whose
--       declaration and body are within unreachable code that is removed.

--    Is_Enumeration_Type (synthesized)
--       Present in all entities, true for enumeration types and subtypes

--    Is_Entry (synthesized)
--       Applies to all entities, True only for entry and entry family
--       entities and False for all other entity kinds.

--    Is_Entry_Formal (Flag52)
--       Present in all entities. Set only for entry formals (which can
--       only be in, in-out or out parameters). This flag is used to speed
--       up the test for the need to replace references in Exp_Ch2.

--    Is_Exported (Flag99)
--       Present in all entities. Set if the entity is exported. For now we
--       only allow the export of constants, exceptions, functions, procedures
--       and variables, but that may well change later on. Exceptions can only
--       be exported in the OpenVMS and Java VM implementations of GNAT.

--    Is_First_Subtype (Flag70)
--       Present in all entities. True for first subtypes (RM 3.2.1(6)),
--       i.e. the entity in the type declaration that introduced the type.
--       This may be the base type itself (e.g. for record declarations and
--       enumeration type declarations), or it may be the first subtype of
--       an anonymous base type (e.g. for integer type declarations or
--       constrained array declarations).

--    Is_Fixed_Point_Type (synthesized)
--       Applies to all entities, true for decimal and ordinary fixed
--       point types and subtypes

--    Is_Floating_Point_Type (synthesized)
--       Applies to all entities, true for float types and subtypes

--    Is_Formal (synthesized)
--       Applies to all entities, true for IN, IN OUT and OUT parameters

--    Is_Formal_Subprogram (Flag111)
--       Defined on all entities, true for generic formal subprograms.

--    Is_For_Access_Subtype (Flag118)
--       Present in E_Private_Subtype and E_Record_Subtype entities.
--       Means the sole purpose of the type is to be designated by an
--       Access_Subtype and hence should not be expanded into components
--       because the type may not have been found or frozen yet.

--    Is_Frozen (Flag4)
--       Present in all type entities. Set if the type has been frozen.

--    Is_Generic_Actual_Type (Flag94)
--       Present in the subtype declaration that renames the generic formal
--       as a subtype of the actual. Guarantees that the subtype is not static
--       within the instance.

--    Is_Generic_Instance (Flag130)
--       Present in all entities. Set to indicate that the entity is an
--       instance of a generic unit.

--    Is_Generic_Subprogram (synthesized)
--       Applies to all entities. Yields True for a generic subprogram
--       (generic function, generic subprogram), False for all other entities.

--    Is_Generic_Type (Flag13)
--       Present in all types and subtypes. Set for types which are generic
--       formal types. Such types have an Ekind that corresponds to their
--       classification, so the Ekind cannot be used to identify generic types.

--    Is_Generic_Unit (synthesized)
--       Applies to all entities. Yields True for a generic unit (generic
--       package, generic function, generic procedure), and False for all
--       other entities.

--    Is_Hidden (Flag57)
--       Present in all entities. Set true for all entities declared in the
--       private part or body of a package. Also marks generic formals of a
--       formal package declared without a box. For library level entities,
--       this flag is set if the entity is not publicly visible.

--    Is_Hidden_Open_Scope (Flag171)
--       Present in all entities. Set true for a scope that contains the
--       instantiation of a child unit, and whose entities are not visible
--       during analysis of the instance.

--    Is_Immediately_Visible (Flag7)
--       Present in all entities. Set if entity is immediately visible, i.e.
--       is defined in some currently open scope (RM 8.3(4)).

--    Is_Imported (Flag24)
--       Present in all entities. Set if the entity is imported. For now we
--       only allow the import of exceptions, functions, procedures, packages.
--       and variables. Exceptions can only be imported in the OpenVMS and
--       Java VM implementations of GNAT. Packages and types can only be
--       imported in the Java VM implementation.

--    Is_Incomplete_Or_Private_Type (synthesized)
--       Applies to all entities, true for private and incomplete types

--    Is_Indefinite_Subtype (synthesized)
--       Applies to all entities for types and subtypes. Determines if given
--       entity is an unconstrained array type or subtype, a discriminated
--       record type or subtype with no initial discriminant values or a
--       class wide type or subtype.

--    Is_Inlined (Flag11)
--       Present in all entities. Set for functions and procedures which are
--       to be inlined. For subprograms created during expansion, this flag
--       may be set directly by the expander to request inlining. Also set
--       for packages that contain inlined subprograms, whose bodies must be
--       be compiled. Is_Inlined is also set on generic subprograms and is
--       inherited by their instances. It is also set on the body entities
--       of inlined subprograms. See also Has_Pragma_Inline.

--    Is_Instantiated (Flag126)
--       Present in generic packages and generic subprograms. Set if the unit
--       is instantiated from somewhere in the extended main source unit. This
--       flag is used to control warnings about the unit being uninstantiated.
--       Also set in a package that is used as an actual for a generic package
--       formal in an instantiation. Also set on a parent instance, in the
--       instantiation of a child, which is implicitly declared in the parent.

--    Is_Integer_Type (synthesized)
--       Applies to all entities, true for integer types and subtypes

--    Is_Internal (Flag17)
--       Present in all entities. Set to indicate an entity created during
--       semantic processing (e.g. an implicit type). Need more documentation
--       on this one! ???

--    Is_Interrupt_Handler (Flag89)
--       Present in procedures. Set if a pragma Interrupt_Handler applies
--       to the procedure. The procedure must be parameterless, and on all
--       targets except AAMP it must be a protected procedure.

--    Is_Intrinsic_Subprogram (Flag64)
--       Present in functions and procedures. It is set if a valid pragma
--       Interface or Import is present for this subprogram specifying pragma
--       Intrinsic. Valid means that the name and profile of the subprogram
--       match the requirements of one of the recognized intrinsic subprograms
--       (see package Sem_Intr for details). Note: the value of Convention for
--       such an entity will be set to Convention_Intrinsic, but it is the
--       setting of Is_Intrinsic_Subprogram, NOT simply having convention set
--       to intrinsic, which causes intrinsic code to be generated.

--    Is_Itype (Flag91)
--       Present in all entities, set for Itypes. If it is set, then the
--       declaration for the type does not appear explicitly in the tree.
--       Instead gigi will elaborate the type when it is first used.
--       Has_Delayed_Freeze can be set for Itypes, and the meaning is that
--       the first use (the one which causes the type to be defined) will
--       be the freeze node. Note that an important restriction on Itypes
--       is that the first use of such a type (the one that causes it to be
--       defined) must be in the same scope as the type.

--    Is_Known_Non_Null (Flag37)
--       Present in all entities. Relevant (and can be set True) only for
--       objects of an access type. It is set if the object is currently
--       known to have a non-null value (meaning that no access checks
--       are needed). The indication can for example come from assignment
--       of an access parameter or an allocator.
--
--       Note: this flag is set according to the sequential flow of the
--       program, watching the current value of the variable. However,
--       this processing can miss cases of changing the value of an aliased
--       or constant object, so even if this flag is set, it should not
--       be believed if the variable is aliased or volatile. It would
--       be a little neater to avoid the flag being set in the first
--       place in such cases, but that's trickier, and there is only
--       one place that tests the value anyway.
--
--       The flag is dynamically set and reset as semantic analysis and
--       expansion proceeds. Its value is meaningless once the tree is
--       fully constructed, since it simply indicates the last state.
--       Thus this flag has no meaning to the back end.

--    Is_Known_Valid (Flag170)
--       Present in all entities. Relevant for types (and subtype) and
--       for objects (and enumeration literals) of a discrete type.
--
--       The purpose of this flag is to implement the requirement stated
--       in (RM 13.9.1(9-11)) which require that the use of possibly invalid
--       values may not cause programs to become erroneous. See the function
--       Exp_Util.Expr_Known_Valid for further details. Note that the setting
--       is conservative, in the sense that if the flag is set, it must be
--       right. If the flag is not set, nothing is known about the validity.
--
--       For enumeration literals, the flag is always set, since clearly
--       an enumeration literal represents a valid value. Range checks
--       where necessary will ensure that this valid value is appropriate.
--
--       For objects, the flag indicates the state of knowledge about the
--       current value of the object. This may be modified during expansion,
--       and thus the final value is not relevant to gigi.
--
--       For types and subtypes, the flag is set if all possible bit patterns
--       of length Object_Size (i.e. Esize of the type) represent valid values
--       of the type. In general for such tytpes, all values are valid, the
--       only exception being the case where an object of the type has an
--       explicit size that is greater than Object_Size.
--
--       For non-discrete objects, the setting of the Is_Known_Valid flag is
--       not defined, and is not relevant, since the considerations of the
--       requirement in (RM 13.9.1(9-11)) do not apply.
--
--       The flag is dynamically set and reset as semantic analysis and
--       expansion proceeds. Its value is meaningless once the tree is
--       fully constructed, since it simply indicates the last state.
--       Thus this flag has no meaning to the back end.

--    Is_Limited_Composite (Flag106)
--       Present in all entities. True for composite types that have a
--       limited component. Used to enforce the rule that operations on
--       the composite type that depend on the full view of the component
--       do not become visible until the immediate scope of the composite
--       type itself (RM 7.3.1 (5)).

--    Is_Limited_Record (Flag25)
--       Present in all entities. Set to true for record (sub)types if the
--       record is declared to be limited. Note that this flag is not set
--       simply because some components of the record are limited.

--    Is_Limited_Type (synthesized)
--       Applies to all entities. True if entity is a limited type (limited
--       private type, task type, protected type, composite containing a
--       limited component, or a subtype of any of these types).

--    Is_Machine_Code_Subprogram (Flag137)
--       Present in subprogram entities. Set to indicate that the subprogram
--       is a machine code subprogram (i.e. its body includes at least one
--       code statement). Also indicates that all necessary semantic checks
--       as required by RM 13.8(3) have been performed.

--    Is_Modular_Integer_Type (synthesized)
--       Applies to all entities. True if entity is a modular integer type

--    Is_Non_Static_Subtype (Flag109)
--       This flag is present in all type and subtype entities. It is set in
--       some (but not all) cases in which a subtype is known to be non-static.
--       Before this flag was added, the computation of whether a subtype was
--       static was entirely synthesized, by looking at the bounds, and the
--       immediate subtype parent. However, this method does not work for some
--       Itypes that have no parent set (and the only way to find the immediate
--       subtype parent is to go through the tree). For now, this flay is set
--       conservatively, i.e. if it is set then for sure the subtype is non-
--       static, but if it is not set, then the type may or may not be static.
--       Thus the test for a static subtype is that this flag is clear AND
--       that the bounds are static AND that the parent subtype (if available
--       to be tested) is static. Eventually we should make sure this flag
--       is always set right, at which point, these comments can be removed,
--       and the tests for static subtypes greatly simplified.

--    Is_Null_Init_Proc (Flag178)
--       Present in procedure entities. Set for generated init proc procedures
--       (used to initialize composite types), if the code for the procedure
--       is null (i.e. is a return and nothing else). Such null initialization
--       procedures are generated in case some client is compiled using the
--       Initialize_Scalars pragma, generating a call to this null procedure,
--       but there is no need to call such procedures within a compilation
--       unit, and this flag is used to suppress such calls.

--    Is_Numeric_Type (synthesized)
--       Applies to all entities, true for all numeric types and subtypes
--       (integer, fixed, float).

--    Is_Object (synthesized)
--       Applies to all entities, true for entities representing objects,
--       including generic formal parameters.

--    Is_Obsolescent (Flag153)
--       Present in subprogram entities. Set if a valid pragma Obsolescent
--       applies to the subprogram.

--    Is_Optional_Parameter (Flag134)
--       Present in parameter entities. Set if the parameter is specified as
--       optional by use of a First_Optional_Parameter argument to one of the
--       extended Import pragmas. Can only be set for OpenVMS versions of GNAT.

--    Is_Ordinary_Fixed_Point_Type (synthesized)
--       Applies to all entities, true for ordinary fixed point types
--       and subtypes

--    Is_Overriding_Operation (Flag39)
--       Present in subprograms. Set if the subprogram is a primitive
--       operation of a derived type, that overrides an inherited operation.

--    Is_Package (synthesized)
--       Applies to all entities. True for packages and generic packages.
--       False for all other entities.

--    Is_Package_Body_Entity (Flag160)
--       Present in all entities. Set for entities defined at the top level
--       of a package body. Used to control externally generated names.

--    Is_Packed (Flag51) [implementation base type only]
--       Present in all type entities. This flag is set only for record and
--       array types which have a packed representation. There are three
--       cases which cause packing:
--
--         1. Explicit use of pragma Pack for an array of package components
--         2. Explicit use of pragma Pack to pack a record
--         4. Setting Component_Size of an array to a bit-packable value
--         3. Indexing an array with a non-standard enumeration type.
--
--       For records, Is_Packed is always set if Has_Pack_Pragma is set,
--       and can also be set on its own in a derived type which inherited
--       its packed status.
--
--       For arrays, Is_Packed is set if an array is bit packed (i.e. the
--       component size is known at compile time and is 1-7, 9-15 or 17-31),
--       or if the array has one or more index types that are enumeration
--       types with non-standard representations (in GNAT, we store such
--       arrays compactly, using the Pos of the enumeration type value).
--
--       As for the case of records, Is_Packed can be set on its own for a
--       derived type, with the same dual before/after freeze meaning.
--       Is_Packed can also be set as the result of an explicit component
--       size clause that specifies an appropriate component size.
--
--       In the bit packed array case, Is_Bit_Packed_Array will be set in
--       the bit packed case once the array type is frozen.
--
--       Before an array type is frozen, Is_Packed will always be set if
--       Has_Pack_Pragma is set. Before the freeze point, it is not possible
--       to know the component size, since the component type is not frozen
--       until the array type is frozen. Thus Is_Packed for an array type
--       before it is frozen means that packed is required. Then if it turns
--       out that the component size is not suitable for bit packing, the
--       Is_Packed flag gets turned off.

--    Is_Packed_Array_Type (Flag138)
--       Present in all entities. This flag is set on the entity for the type
--       used to implement a packed array (either a modular type, or a subtype
--       of Packed_Bytes{1,2,4} as appropriate). The flag is set if and only
--       if the type appears in the Packed_Array_Type field of some other type
--       entity. It is used by Gigi to activate the special processing for such
--       types (unchecked conversions that would not otherwise be allowed are
--       allowed for such types). If the Is_Packed_Array_Type flag is set in
--       an entity, then the Original_Array_Type field of this entity points
--       to the original array type for which this is the packed array type.

--    Is_Potentially_Use_Visible (Flag9)
--       Present in all entities. Set if entity is potentially use visible,
--       i.e. it is defined in a package that appears in a currently active
--       use clause (RM 8.4(8)). Note that potentially use visible entities
--       are not necessarily use visible (RM 8.4(9-11)).

--    Is_Preelaborated (Flag59)
--       Present in all entities, set in E_Package and E_Generic_Package
--       entities to which a pragma Preelaborate is applied, and also in
--       all entities within such packages. Note that the fact that this
--       flag is set does not necesarily mean that no elaboration code is
--       generated for the package.

--    Is_Private_Composite (Flag107)
--       Present in composite types that have a private component. Used to
--       enforce the rule that operations on the composite type that depend
--       on the fulll view of the component, do not become visible until the
--       immediate scope of the composite type itself (7.3.1 (5)). Both this
--       flag and Is_Limited_Composite are needed.

--    Is_Private_Descendant (Flag53)
--       Present in entities that can represent library units (packages,
--       functions, procedures). Set if the library unit is itself a private
--       child unit, or if it is the descendent of a private child unit.

--    Is_Private_Type (synthesized)
--       Applies to all entities, true for private types and subtypes,
--       as well as for record with private types as subtypes

--    Is_Protected_Type (synthesized)
--       Applies to all entities, true for protected types and subtypes

--    Is_Public (Flag10)
--       Present in all entities. Set to indicate that an entity defined in
--       one compilation unit can be referenced from other compilation units.
--       If this reference causes a reference in the generated variable, for
--       example in the case of a variable name, then Gigi will generate an
--       appropriate external name for use by the linker.

--    Is_Protected_Private (synthesized)
--       Applies to a record component. Returns true if this component
--       is used to represent a private declaration of a protected type.

--    Is_Protected_Record_Type (synthesized)
--       Applies to all entities, true if Is_Concurrent_Record_Type
--       Corresponding_Concurrent_Type is a protected type.

--    Is_Pure (Flag44)
--       Present in all entities. Set in all entities of a unit to which a
--       pragma Pure is applied, and also set for the entity of the unit
--       itself. In addition, this flag may be set for any other functions
--       or procedures that are known to be side effect free, so in the case
--       of subprograms, the Is_Pure flag may be used by the optimizer to
--       imply that it can assume freedom from side effects (other than those
--       resulting from assignment to out parameters, or to objects designated
--       by access parameters).

--    Is_Real_Type (synthesized)
--       Applies to all entities, true for real types and subtypes

--    Is_Record_Type (synthesized)
--       Applies to all entities, true for record types and subtypes,
--       includes class-wide types and subtypes (which are also records)

--    Is_Remote_Call_Interface (Flag62)
--       Present in all entities, set in E_Package and E_Generic_Package
--       entities to which a pragma Remote_Call_Interace is applied, and
--       also in all entities within such packages.

--    Is_Remote_Types (Flag61)
--       Present in all entities, set in E_Package and E_Generic_Package
--       entities to which a pragma Remote_Types is applied, and also in
--       all entities within such packages.

--    Is_Renaming_Of_Object (Flag112)
--       Present in all entities, set only for a variable or constant for
--       which the Renamed_Object field is non-empty and for which the
--       renaming is handled by the front end, by macro substitution of
--       a copy of the (evaluated) name tree whereever the variable is used.

--    Is_Return_By_Reference_Type (synthesized)
--       Applies to all type entities. True if the type is required to
--       be returned by reference, as defined in 6.5(11-16).

--    Is_Scalar_Type (synthesized)
--       Applies to all entities, true for scalar types and subtypes

--    Is_Shared_Passive (Flag60)
--       Present in all entities, set in E_Package and E_Generic_Package
--       entities to which a pragma Shared_Passive is applied, and also in
--       all entities within such packages.

--    Is_Statically_Allocated (Flag28)
--       Present in all entities. This can only be set True for exception,
--       variable, constant, and type/subtype entities. If the flag is set,
--       then the variable or constant must be allocated statically rather
--       than on the local stack frame. For exceptions, the meaning is that
--       the exception data should be allocated statically (and indeed this
--       flag is always set for exceptions, since exceptions do not have
--       local scope). For a type, the meaning is that the type must be
--       elaborated at the global level rather than locally. No type marked
--       with this flag may depend on a local variable, or on any other type
--       which does not also have this flag set to True. For a variable or
--       or constant, if the flag is set, then the type of the object must
--       either be declared at the library level, or it must also have the
--       flag set (since to allocate the oject statically, its type must
--       also be elaborated globally).

--    Is_Subprogram (synthesized)
--       Applies to all entities, true for bodies of functions, procedures
--       and operators.

--    Is_String_Type (synthesized)
--       Applies to all type entities. Determines if the given type is a
--       string type, i.e. it is directly a string type or string subtype,
--       or a string slice type, or an array type with one dimension and a
--       component type that is a character type.

--    Is_Tag (Flag78)
--       Present in E_Component. For regular tagged type this flag is set on
--       the tag component (whose name is Name_uTag) and for CPP_Class tagged
--       types, this flag marks the pointer to the main vtable (i.e. the one
--       to be extended by derivation)

--    Is_Tagged_Type (Flag55)
--       Present in all entities, true for an entity for a tagged type.

--    Is_Task_Record_Type (synthesized)
--       Applies to all entities, true if Is_Concurrent_Record_Type
--       Corresponding_Concurrent_Type is a task type.

--    Is_Task_Type (synthesized)
--       Applies to all entities, true for task types and subtypes

--    Is_Thread_Body (Flag77)
--       Applies to subprogram entities. Set if a valid Thread_Body pragma
--       applies to this subprogram, which is thus a thread body.

--    Is_True_Constant (Flag163)
--       This flag is set in constants and variables which have an initial
--       value specified but which are never assigned, partially or in the
--       whole. For variables, it means that the variable was initialized
--       but never modified, and hence can be treated as a constant by the
--       code generator. For a constant, it means that the constant was not
--       modified by generated code (e.g. to set a discriminant in an init
--       proc). Assignments by user or generated code will reset this flag.
--
--       Note: there is one situation in which the back end does not permit
--       this flag to be set, even if no assignments are generated. This is
--       the case of an object of a record or array type which is initialized
--       with an aggregate, and is itself used as the expression initializing
--       an atomic object, or the right hand side of an assignment to an atomic
--       object. In this case the object must not have Is_True_Constant set,
--       even though no assignments are generated (the reason for this is that
--       the back end must not optimize the object away, because that would
--       violate the restriction on aggregates in these positions).

--    Is_Type (synthesized)
--       Applies to all entities, true for a type entity

--    Is_Unchecked_Union (Flag117)
--       Present in all entities. Set only in record types to which the
--       pragma Unchecked_Union has been validly applied.

--    Is_Unsigned_Type (Flag144)
--       Present in all types, but can be set only for discrete and fixed-point
--       type and subtype entities. This flag is only valid if the entity is
--       frozen. If set it indicates that the representation is known to be
--       unsigned (i.e. that no negative values appear in the range). This is
--       normally just a reflection of the lower bound of the subtype or base
--       type, but there is one case in which the setting is non-obvious,
--       namely the case of an unsigned subtype of a signed type from which
--       a further subtype is obtained using variable bounds. This further
--       subtype is still unsigned, but this cannot be determined by looking
--       at its bounds or the bounds of the corresponding base type.

--    Is_Valued_Procedure (Flag127)
--       Present in procedure entities. Set if an Import_Valued_Procedure
--       or Export_Valued_Procedure pragma applies to the procedure entity.

--    Is_Visible_Child_Unit (Flag116)
--       Present in compilation units that are child units. Once compiled,
--       child units remain chained to the entities in the parent unit, and
--       a separate flag must be used to indicate whether the names are
--       visible by selected notation, or not.

--    Is_VMS_Exception (Flag133)
--       Present in all entities. Set only for exception entities where the
--       exception was specified in an Import_Exception or Export_Exception
--       pragma with the VMS option for Form. See description of these pragmas
--       for details. This flag can only be set in OpenVMS versions of GNAT.

--    Is_Volatile (Flag16)
--       Present in all type entities, and also in constants, components and
--       variables. Set if a pragma Volatile applies to the entity. Also set
--       if pragma Shared or pragma Atomic applies to entity. In the case of
--       private or incomplete types, this flag is set in both the private
--       and full view. The flag is not set reliably on private subtypes,
--       and is always retrieved from the base type (but this is not a base-
--       type-only attribute because it applies to other entities). Note that
--       the back end should use Treat_As_Volatile, rather than Is_Volatile
--       to indicate code generation requirements for volatile variables.
--       Similarly, any front end test which is concerned with suppressing
--       optimizations on volatile objects should test Treat_As_Volatile
--       rather than testing this flag.

--    Is_Wrapper_Package (synthesized)
--       Present in package entities. Indicates that the package has been
--       created as a wrapper for a subprogram instantiation.

--    Kill_Elaboration_Checks (Flag32)
--       Present in all entities. Set by the expander to kill elaboration
--       checks which are known not to be needed. Equivalent in effect to
--       the use of pragma Supress (Elaboration_Checks) for that entity
--       except that the effect is permanent and cannot be undone by a
--       subsequent pragma Unsuppress.

--    Kill_Range_Checks (Flag33)
--       Present in all entities. Set by the expander to kill elaboration
--       checks which are known not to be needed. Equivalent in effect to
--       the use of pragma Supress (Range_Checks) for that entity except
--       that the result is permanent and cannot be undone by a subsequent
--       pragma Unsuppress.

--    Kill_Tag_Checks (Flag34)
--       Present in all entities. Set by the expander to kill elaboration
--       checks which are known not to be needed. Equivalent in effect to
--       the use of pragma Supress (Tag_Checks) for that entity except
--       that the result is permanent and cannot be undone by a subsequent
--       pragma Unsuppress.

--    Last_Entity (Node20)
--       Present in all entities which act as scopes to which a list of
--       associated entities is attached (blocks, class subtypes and types,
--       entries, functions, loops, packages, procedures, protected objects,
--       record types and subtypes, private types, task types and subtypes).
--       Points to a the last entry in the list of associated entities chained
--       through the Next_Entity field. Empty if no entities are chained.

--    Limited_View (Node23)
--       Present in non-generic package entities that are not instances. Bona
--       fide package with the limited-view list through the first_entity and
--       first_private attributes. The elements of this list are the shadow
--       entities created for the types and local packages that are declared
--       in a package appearing in a limited_with clause (Ada 2005: AI-50217)

--    Lit_Indexes (Node15)
--       Present in enumeration types and subtypes. Non-empty only for the
--       case of an enumeration root type, where it contains the entity for
--       the generated indexes entity. See unit Exp_Imgv for full details of
--       the nature and use of this entity for implkementing the Image and
--       Value attributes for the enumeration type in question.
--
--    Lit_Strings (Node16)
--       Present in enumeration types and subtypes. Non-empty only for the
--       case of an enumeration root type, where it contains the entity for
--       the literals string entity. See unit Exp_Imgv for full details of
--       the nature and use of this entity for implementing the Image and
--       Value attributes for the enumeration type in question.

--    Machine_Radix_10 (Flag84)
--       Present in decimal types and subtypes, set if the Machine_Radix
--       is 10, as the result of the specification of a machine radix
--       representation clause. Note that it is possible for this flag
--       to be set without having Has_Machine_Radix_Clause True. This
--       happens when a type is derived from a type with a clause present.

--    Master_Id (Node17)
--       Present in access types and subtypes. Empty unless Has_Task is
--       set for the designated type, in which case it points to the entity
--       for the Master_Id for the access type master.

--    Materialize_Entity (Flag168)
--       Present in all entities. Set only for constant or renamed entities
--       which should be materialized for debugging purposes. In the case of
--       a constant, a memory location should be allocated containing the
--       value. In the case of a renaming, a memory location containing the
--       renamed address should be allocated.

--    Mechanism (Uint8) (returned as Mechanism_Type)
--       Present in functions and non-generic formal parameters. Indicates
--       the mechanism to be used for the function return or for the formal
--       parameter. See separate section on passing mechanisms. This field
--       is also set (to the default value of zero) in a subprogram body
--       entity but not used in this context.

--    Modulus (Uint17) [base type only]
--       Present in modular types. Contains the modulus. For the binary
--       case, this will be a power of 2, but if Non_Binary_Modulus is
--       set, then it will not be a power of 2.

--    Must_Be_On_Byte_Boundary (Flag183)
--       Present in entities for types and subtypes. Set if objects of
--       the type must always be allocated on a byte boundary (more
--       accurately a storage unit boundary). The front end checks that
--       component clauses respect this rule, and the back end ensures
--       that record packing does not violate this rule. Currently the
--       flag is set only for packed arrays longer than 64 bits.

--    Needs_Debug_Info (Flag147)
--       Present in all entities. Set if the entity requires debugging
--       information to be generated. This is true of all entities that
--       have Comes_From_Source set, and also transitively for entities
--       associated with such components (e.g. their types). It is true
--       for all entities in Debug_Generated_Code mode (-gnatD switch).
--       This is the flag that the back end should check to determine
--       whether or not to generate debugging information for an entity.

--    Needs_No_Actuals (Flag22)
--       Present in callable entities (subprograms, entries, access to
--       subprograms)  which can be called without actuals because all of
--       their formals (if any) have default values. This flag simplifies the
--       resolution of the syntactic ambiguity involving a call to these
--       entities when the return type is an array type, and a call can be
--       interpreted as an indexing of the result of the call. It is also
--       used to resolve various cases of entry calls.

--    Never_Set_In_Source (Flag115)
--       Present in all entities, but relevant only for variables and
--       parameters. This flag is set if the object is never assigned
--       a value in user source code, either by assignment or by the
--       use of an initial value, or by some other means.

--       This flag is only for the purposes of issuing warnings, it must not
--       be used by the code generator to indicate that the variable is in
--       fact a constant, since some assignments in generated code do not
--       count (for example, the call to an init proc to assign some but
--       not all of the fields in a partially initialized record). The code
--       generator should instead use the flag Is_True_Constant.
--
--       For the purposes of this warning, the default assignment of
--       access variables to null is not considered the assignment of
--       of a value (so the warning can be given for code that relies
--       on this initial null value, when no other value is ever set).
--
--       In variables and out parameters, if this flag is set after full
--       processing of the corresponding declarative unit, it indicates that
--       the variable or parameter was never set, and a warning message can
--       be issued.
--
--       Note: this flag is initially set, and then cleared on encountering
--       any construct that might conceivably legitimately set the value.
--       Thus during the analysis of a declarative region and its associated
--       statement sequence, the meaning of the flag is "not set yet", and
--       once this analysis is complete the flag means "never assigned".

--       Note: for variables appearing in package declarations, this flag
--       is never set. That is because there is no way to tell if some
--       client modifies the variable (or in the case of variables in the
--       private part, if some child unit modifies the variables).

--       Note: in the case of renamed objects, the flag must be set in the
--       ultimate renamed object. Clients noting a possible modification
--       should use the Note_Possible_Modification procedure in Sem_Util
--       rather than Set_Never_Set_In_Source precisely to deal properly with
--       the renaming possibility.

--    Next_Component (synthesized)
--       Applies to record components. Returns the next component by
--       following the chain of declared entities until one is found which
--       corresponds to a component (Ekind is E_Component). Any internal types
--       generated from the subtype indications of the record components are
--       skipped. Returns Empty if no more components.

--    Next_Discriminant (synthesized)
--       Applies to discriminants returned by First/Next_Discriminant.
--       Returns the next language-defined (ie: perhaps non-girder)
--       discriminant by following the chain of declared entities as long as
--       the kind of the entity corresponds to a discriminant. Note that the
--       discriminants might be the only components of the record.
--       Returns Empty if there are no more.

--    Next_Entity (Node2)
--       Present in all entities. The entities of a scope are chained, with
--       the head of the list being in the First_Entity field of the scope
--       entity. All entities use the Next_Entity field as a forward pointer
--       for this list, with Empty indicating the end of the list. Since this
--       field is in the base part of the entity, the access routines for this
--       field are in Sinfo.

--    Next_Formal (synthesized)
--       Applies to the entity for a formal parameter. Returns the next
--       formal parameter of the subprogram or subprogram type. Returns
--       Empty if there are no more formals.

--    Next_Formal_With_Extras (synthesized)
--       Applies to the entity for a formal parameter. Returns the next
--       formal parameter of the subprogram or subprogram type. Returns
--       Empty if there are no more formals. The list returned includes
--       all the extra formals (see description of Extra_Formal field)

--    Next_Girder_Discriminant (synthesized)
--       Applies to discriminants. Set only for a discriminant returned by
--       a call to First/Next_Girder_Discriminant. Returns next girder
--       discriminant, if there are more (see complete description in
--       First_Girder_Discriminant), or Empty if there are no more.

--    Next_Index (synthesized)
--       Applies to array types and subtypes and to string types and
--       subtypes. Yields the next index. The first index is obtained by
--       using the First_Index attribute, and then subsequent indexes are
--       obtained by applying Next_Index to the previous index. Empty is
--       returned to indicate that there are no more indexes. Note that
--       unlike most attributes in this package, Next_Index applies to
--       nodes for the indexes, not to entities.

--    Next_Inlined_Subprogram (Node12)
--       Present in subprograms. Used to chain inlined subprograms used in
--       the current compilation, in the order in which they must be compiled
--       by Gigi to insure that all inlinings are performed.

--    Next_Literal (synthesized)
--       Applies to enumeration literals, returns the next literal, or
--       Empty if applied to the last literal. This is actually a synonym
--       for Next, but its use is preferred in this context.

--    Non_Binary_Modulus (Flag58) [base type only]
--       Present in modular integer types. Set if the modulus for the type
--       is other than a power of 2.

--    Non_Limited_View (Node17)
--       Present in incomplete types that are the shadow entities created
--       when analyzing a limited_with_clause (Ada 2005: AI-50217). Points to
--       the defining entity in the original declaration.

--    Nonzero_Is_True (Flag162) [base type only]
--       Present in enumeration types. True if any non-zero value is to be
--       interpreted as true. Currently this is set true for derived Boolean
--       types which have a convention of C, C++ or Fortran.

--    No_Pool_Assigned (Flag131) [root type only]
--       Present in access types. Set if a storage size clause applies to
--       the variable with a compile time known value of zero. This flag is
--       used to generate warnings if any attempt is made to allocate or free
--       an instance of such an access type. This is set only in the root
--       type, since derived types must have the same pool.

--    No_Return (Flag113)
--       Present in procedure and generic procedure entries. Indicates that
--       a pragma No_Return applies to the procedure.

--    Normalized_First_Bit (Uint8)
--       Present in components and discriminants. Indicates the normalized
--       value of First_Bit for the component, i.e. the offset within the
--       lowest addressed storage unit containing part or all of the field.
--       Set to No_Uint if no first bit position is assigned yet.

--    Normalized_Position (Uint14)
--       Present in components and discriminants. Indicates the normalized
--       value of Position for the component, i.e. the offset in storage
--       units from the start of the record to the lowest addressed storage
--       unit containing part or all of the field.

--    Normalized_Position_Max (Uint10)
--       Present in components and discriminants. For almost all cases, this
--       is the same as Normalized_Position. The one exception is for the case
--       of a discriminated record containing one or more arrays whose length
--       depends on discriminants. In this case, the Normalized_Position_Max
--       field represents the maximum possible value of Normalized_Position
--       assuming min/max values for discriminant subscripts in all fields.
--       This is used by Layout in front end layout mode to properly computed
--       the maximum size such records (needed for allocation purposes when
--       there are default discriminants, and also for the 'Size value).

--    No_Strict_Aliasing (Flag136) [base type only]
--       Present in access types. Set to direct the back end to avoid any
--       optimizations based on an assumption about the aliasing status of
--       objects designated by the access type. For the case of the gcc
--       back end, the effect is as though all references to objects of
--       the type were compiled with -fno-strict-aliasing. This flag is
--       set if an unchecked conversion with the access type as a target
--       type occurs in the same source unit as the declaration of the
--       access type, or if an explicit pragma No_Strict_Aliasing applies.

--    Number_Dimensions (synthesized)
--       Applies to array types and subtypes. Returns the number of dimensions
--       of the array type or subtype as a value of type Pos.

--    Number_Discriminants (synthesized)
--       Applies to all types with discriminants. Yields the number of
--       discriminants as a value of type Pos.

--    Number_Entries (synthesized)
--       Applies to concurrent types. Returns the number of entries that are
--       declared within the task or protected definition for the type.

--    Number_Formals (synthesized)
--       Applies to subprograms and subprogram types. Yields the number of
--       formals as a value of type Pos.

--    Obsolescent_Warning (Node24)
--       Present in subprogram entities. Set non-empty only if the pragma
--       Obsolescent had a string argument, in which case it records the
--       contents of the corresponding string literal node.

--    Original_Access_Type (Node21)
--       Present in access to subprogram types. Anonymous access to protected
--       subprogram types are replaced by an occurrence of an internal access
--       to subprogram type. This field links the replacement entity with the
--       original entity.

--    Original_Array_Type (Node21)
--       Present in modular types and array types and subtypes. Set only
--       if the Is_Packed_Array_Type flag is set, indicating that the type
--       is the implementation type for a packed array, and in this case it
--       points to the original array type for which this is the packed
--       array implementation type.

--    Object_Ref (Node17)
--       Present in protected bodies. This is an implicit prival for the
--       Protection object associated with a protected object. See Prival
--       for further details on the use of privals.

--    Original_Record_Component (Node22)
--       Present in components, including discriminants. The usage depends
--       on whether the record is a base type and whether it is tagged.
--
--       In base tagged types:
--         When the component is inherited in a record extension, it points
--         to the original component (the entity of the ancestor component
--         which is not itself inherited) otherwise it points to itself.
--         Gigi uses this attribute to implement the automatic dereference in
--         the extension and to apply the transformation:
--
--            Rec_Ext.Comp -> Rec_Ext.Parent. ... .Parent.Comp
--
--       In base non-tagged types:
--         Always points to itself except for non-girder discriminants, where
--         it points to the girder discriminant it renames.
--
--       In subtypes (tagged and untagged):
--         Points to the component in the base type.

--    Packed_Array_Type (Node23)
--       Present in array types and subtypes, including the string literal
--       subtype case, if the corresponding type is packed (either bit packed
--       or packed to eliminate holes in non-contiguous enumeration type
--       index types). References the type used to represent the packed array,
--       which is either a modular type for short static arrays, or an
--       array of System.Unsigned. Note that in some situations (internal
--       types, and references to fields of variant records), it is not
--       always possible to construct this type in advance of its use. If
--       Packed_Array_Type is empty, then the necessary type is declared
--       on the fly for each reference to the array.

--    Parameter_Mode (synthesized)
--       Applies to formal parameter entities. This is a synonym for Ekind,
--       used when obtaining the formal kind of a formal parameter (the result
--       is one of E_[In/Out/In_Out]_Paramter)

--    Parent_Subtype (Node19)
--       Present in E_Record_Type. Points to the subtype to use for a
--       field that references the parent record.

--    Primitive_Operations (Elist15)
--       Present in tagged record types and subtypes and in tagged private
--       types. Points to an element list of entities for primitive operations
--       for the tagged type. Not present (and not set) in untagged types (it
--       is an error to reference the primitive operations field of a type
--       that is not tagged).

--    Private_Dependents (Elist18)
--       Present in private (sub)types. Records the subtypes of the
--       private type, derivations from it, and records and arrays
--       with components dependent on the type.
--
--       The subtypes are traversed when installing and deinstalling
--       (the full view of) a private type in order to ensure correct
--       view of the subtypes.
--
--       Used in similar fashion for incomplete types: holds list of subtypes
--       of these incomplete types that have discriminant constraints. The
--       full views of these subtypes are constructed when the full view of
--       the incomplete type is processed.

--       In addition, if the incomplete type is the designated type in an
--       access definition for an access parameter, the operation may be
--       a dispatching primitive operation, which is only known when the full
--       declaration of the type is seen. Subprograms that have such an
--       access parameter are also placed in the list of private_dependents.

--    Prival (Node17)
--       Present in components. Used for representing private declarations
--       of protected objects (private formal: by analogy to Discriminal_Link).
--       Empty unless the synthesized Is_Protected_Private attribute is
--       true. The entity used as a formal parameter that corresponds to
--       the to the private declaration in protected operations. See
--       "Private data in protected objects" for details.

--    Privals_Chain (Elist23)
--       Present in protected operations (subprograms and entries). Links
--       all occurrences of the Privals in the body of the operation, in
--       order to patch their types at the end of their expansion. See
--       "Private data in protected objects" for details.

--    Private_View (Node22)
--       For each private type, three entities are allocated, the private view,
--       the full view, and the shadow entity. The shadow entity contains a
--       copy of the private view and is used for restoring the proper private
--       view after a region in which the full view is visible (and is copied
--       into the entity normally used for the private view during this period
--       of visibility). The Private_View field is self-referential when the
--       private view lives in its normal entity, but in the copy that is made
--       in the shadow entity, it points to the proper location in which to
--       restore the private view saved in the shadow.

--    Protected_Formal (Node22)
--       Present in formal parameters (in, in out and out parameters). Used
--       only for formals of protected operations. References corresponding
--       formal parameter in the unprotected version of the operation that
--       is created during expansion.

--    Protected_Body_Subprogram (Node11)
--       Present in protected operations. References the entity for the
--       subprogram which implements the body of the operation.

--    Protected_Operation (Node23)
--       Present in components. Used for representing private declarations
--       of protected objects. Empty unless the synthesized attribute
--       Is_Protected_Private is True. This is the entity corresponding
--       to the body of the protected operation currently being analyzed,
--       and which will eventually use the current Prival associated with
--       this component to refer to the renaming of a private object
--       component. As soon as the expander generates this renaming, this
--       attribute is changed to refer to the next protected subprogram.
--       See "Private data in protected objects" for details.

--    Reachable (Flag49)
--       Present in labels. The flag is set over the range of statements in
--       which a goto to that label is legal.

--    Referenced (Flag156)
--       Present in all entities, set if the entity is referenced, except
--       for the case of an appearence of a simple variable that is not a
--       renaming, as the left side of an assignment in which case the flag
--       Referenced_As_LHS is set instead.

--    Referenced_As_LHS (Flag36): This flag is set instead of
--       Referenced if a simple variable that is not a renaming appears as
--       the left side of an assignment. The reason we distinguish this kind
--       of reference is that we have a separate warning for variables that
--       are only assigned and never read.

--    Referenced_Object (Node10)
--       Present in all type entities. Set non-Empty only for type entities
--       constructed for unconstrained objects, or objects that depend on
--       discriminants. Points to the expression from which the actual
--       subtype of the object can be evaluated.

--    Register_Exception_Call (Node20)
--       Present in exception entities. When an exception is declared,
--       a call is expanded to Register_Exception. This field points to
--       the expanded N_Procedure_Call_Statement node for this call. It
--       is used for Import/Export_Exception processing to modify the
--       register call to make appropriate entries in the special tables
--       used for handling these pragmas at runtime.

--    Related_Array_Object (Node19)
--       Present in array types and subtypes. Used only for the base type
--       and subtype created for an anonymous array object. Set to point
--       to the entity of the corresponding array object. Currently used
--       only for type-related error messages.

--    Related_Instance (Node15)
--       Present in the wrapper packages created for subprogram instances.
--       The internal subprogram that implements the instance is inside the
--       wrapper package, but for debugging purposes its external symbol
--       must correspond to the name and scope of the related instance.

--    Renamed_Entity (Node18)
--       Present in exceptions, packages and generic units that are defined
--       by a renaming declaration. Denotes the renamed entity, or transit-
--       itively the ultimate renamed entity if there is a chain of renaming
--       declarations.

--    Renamed_Object (Node18)
--       Present in all objects (constants, variables, components, formal
--       parameters, generic formal parameters, and loop parameters). Set
--       non-Empty if the object was declared by a renaming declaration, in
--       which case it references the tree node for the name of the renamed
--       object. This is only possible for the variable and constant cases.
--       For formal parameters, this field is used in the course of inline
--       expansion, to map the formals of a subprogram into the corresponding
--       actuals. For formals of a task entry, it denotes the local renaming
--       that replaces the actual within the accept statement.
--       The field is Empty otherwise.

--    Renaming_Map (Uint9)
--       Present in generic subprograms, generic packages, and their
--       instances. Also present in the instances of the corresponding
--       bodies. Denotes the renaming map (generic entities => instance
--       entities) used to construct the instance by givin an index into
--       the tables used to represent these maps. See Sem_Ch12 for further
--       details. The maps for package instances are also used when the
--       instance is the actual corresponding to a formal package.

--    Return_Present (Flag54)
--       Present in function and generic function entities. Set if the
--       function contains a return statement (used for error checking).
--       This flag can also be set in procedure and generic procedure
--       entities (for convenience in setting it), but is only tested
--       for the function case.

--    Returns_By_Ref (Flag90)
--       Present in function entities, to indicate that the function
--       returns the result by reference, either because its return typ is a
--       by-reference-type or because it uses explicitly the secondary stack.

--    Reverse_Bit_Order (Flag164) [base type only]
--       Present in all record type entities. Set if a valid pragma an
--       attribute represention clause for Bit_Order has reversed the order
--       of bits from the default value. When this flag is set, a component
--       clause must specify a set of bits entirely contained in a single
--       storage unit.

--    RM_Size (Uint13)
--       Present in all type and subtype entities. Contains the value of
--       type'Size as defined in the RM. See also the Esize field and
--       and the description on "Handling of Type'Size Values". A value
--       of zero in this field for a non-discrete type means that
--       the front end has not yet determined the size value. For the
--       case of a discrete type, this field is always set by the front
--       end and zero is a legitimate value for a type with one value.

--    Root_Type (synthesized)
--       Applies to all type entities. For class-wide types, return the root
--       type of the class covered by the CW type, otherwise returns the
--       ultimate derivation ancestor of the given type. This function
--       preserves the view, i.e. the Root_Type of a partial view is the
--       partial view of the ulimate ancestor, the Root_Type of a full view
--       is the full view of the ultimate ancestor. Note that this function
--       does not correspond exactly to the use of root type in the RM, since
--       in the RM root type applies to a class of types, not to a type.

--    Scalar_Range (Node20)
--       Present in all scalar types (including modular types, where the
--       bounds are 0 .. modulus - 1). References a node in the tree that
--       contains the bounds for the range. Note that this information
--       could be obtained by rummaging around the tree, but it is more
--       convenient to have it immediately at hand in the entity. The
--       contents of Scalar_Range can either be an N_Subtype_Indication
--       node (with a constraint), or a Range node, but not a simple
--       subtype reference (a subtype is converted into a range).

--    Scale_Value (Uint15)
--       Present in decimal fixed-point types and subtypes. Contains the scale
--       for the type (i.e. the value of type'Scale = the number of decimal
--       digits after the decimal point).

--    Scope (Node3)
--       Present in all entities. Points to the entity for the scope (block,
--       loop, subprogram, package etc.) in which the entity is declared.
--       Since this field is in the base part of the entity node, the access
--       routines for this field are in Sinfo.

--    Scope_Depth (synth)
--       Applies to program units, blocks, concurrent types and entries,
--       and also to record types, i.e. to any entity that can appear on
--       the scope stack. Yields the scope depth value, which for those
--       entities other than records is simply the scope depth value,
--       for record entities, it is the Scope_Depth of the record scope.

--    Scope_Depth_Value (Uint22)
--       Present in program units, blocks, concurrent types and entries.
--       Indicates the number of scopes that statically enclose the
--       declaration of the unit or type. Library units have a depth of zero.
--       Note that record types can act as scopes but do NOT have this field
--       set (see Scope_Depth above)

--    Scope_Depth_Set (synthesized)
--       Applies to a special predicate function that returns a Boolean value
--       indicating whether or not the Scope_Depth field has been set. It
--       is needed, since returns an invalid value in this case!

--    Sec_Stack_Needed_For_Return (Flag167)
--       Present in scope entities (blocks, functions, procedures, tasks,
--       entries). Set to True when secondary stack is used to hold
--       the returned value of a function and thus should not be
--       released on scope exit.

--    Shadow_Entities (List14)
--       Present in package and generic package entities. Points to a list
--       of entities that correspond to private types. For each private type
--       a shadow entity is created that holds a copy of the private view.
--       In regions of the program where the full views of these private
--       entities are visible, the full view is copied into the entity that
--       is normally used to hold the private view, but the shadow entity
--       copy is unchanged. The shadow entities are then used to restore the
--       original private views at the end of the region. This list is a
--       standard format list (i.e. First (Shadow_Entities) is the first
--       entry and subsequent entries are obtained using Next.

--    Shared_Var_Assign_Proc (Node22)
--       Present in variables. Set non-Empty only if Is_Shared_Passive is
--       set, in which case this is the entity for the shared memory assign
--       routine. See Exp_Smem for full details.

--    Shared_Var_Read_Proc (Node15)
--       Present in variables. Set non-Empty only if Is_Shared_Passive is
--       set, in which case this is the entity for the shared memory read
--       routine. See Exp_Smem for full details.

--    Size_Check_Code (Node19)
--       Present in constants and variables. Normally Empty. Set if code is
--       generated to check the size of the object. This field is used to
--       suppress this code if a subsequent address clause is encountered.

--    Size_Clause (synthesized)
--       Applies to all entities. If a size clause is present in the rep
--       item chain for an entity then the attribute definition clause node
--       for the size clause is returned. Otherwise Size_Clause returns Empty
--       if no item is present. Usually this is only meaningful if the flag
--       Has_Size_Clause is set. This is because when the representation item
--       chain is copied for a derived type, it can inherit a size clause that
--       is not applicable to the entity.

--    Size_Depends_On_Discriminant (Flag177)
--       Present in all entities for types and subtypes. Indicates that the
--       size of the type depends on the value of one or more discriminants.
--       Currently, this flag is only set in front end layout mode for arrays
--       which have one or more bounds depending on a discriminant value.

--    Size_Known_At_Compile_Time (Flag92)
--       Present in all entities for types and subtypes. Indicates that the
--       size of objects of the type is known at compile time. This flag is
--       used to optimize some generated code sequences, and also to enable
--       some error checks (e.g. disallowing component clauses on variable
--       length objects. It is set conservatively (i.e. if it is True, the
--       size is certainly known at compile time, if it is False, then the
--       size may or may not be known at compile time, but the code will
--       assume that it is not known).

--    Small_Value (Ureal21)
--       Present in fixed point types. Points to the universal real for the
--       Small of the type, either as given in a representation clause, or
--       as computed (as a power of two) by the compiler.

--    Spec_Entity (Node19)
--       Present in package body entities. Points to corresponding package
--       spec entity. Also present in subprogram body parameters in the
--       case where there is a separate spec, where this field references
--       the corresponding parameter entities in the spec.

--    Storage_Size_Variable (Node15) [implementation base type only]
--       Present in access types and task type entities. This flag is set
--       if a valid and effective pragma Storage_Size applies to the base
--       type. Points to the entity for a variable that is created to
--       hold the value given in a Storage_Size pragma for an access
--       collection or a task type. Note that in the access type case,
--       this field is present only in the root type (since derived types
--       share the same storage pool).

--    Stored_Constraint (Elist23)
--       Present in entities that can have discriminants (concurrent types
--       subtypes, record types and subtypes, private types and subtypes,
--       limited private types and subtypes and incomplete types). Points
--       to an element list containing the expressions for each of the
--       stored discriminants for the record (sub)type.

--    Strict_Alignment (Flag145) [implementation base type only]
--       Present in all type entities. Indicates that some containing part
--       is either aliased or tagged. This prohibits packing the object
--       tighter than its natural size and alignment.

--    String_Literal_Length (Uint16)
--       Present in string literal subtypes (which are created to correspond
--       to string literals in the program). Contains the length of the string
--       literal.

--    String_Literal_Low_Bound (Node15)
--       Present in string literal subtypes (which are created to correspond
--       to string literals in the program). Contains an expression whose
--       value represents the low bound of the literal. This is a copy of
--       the low bound of the applicable index constraint if there is one,
--       or a copy of the low bound of the index base type if not.

--    Suppress_Elaboration_Warnings (Flag148)
--       Present in all entities, relevant only for subprogram entities. If
--       this flag is set then Sem_Elab will not generate elaboration warnings
--       for the subprogram. Suppression of such warnings is automatic for
--       subprograms for which elaboration checks are suppressed (without the
--       need to set this flag), but the flag is also set for various internal
--       entities (such as init procs) which are known not to generate any
--       possible access before elaboration. (we need a clear description of
--       how this flag differs in effect from Elaboration_Checks_Suppressed???)

--    Suppress_Init_Proc (Flag105) [base type only]
--       Present in all type entities. Set to suppress the generation of
--       initialization procedures where they are known to be not needed.
--       For example, the enumeration image table entity uses this flag.

--    Suppress_Style_Checks (Flag165)
--       Present in all entities. Suppresses any style checks specifically
--       associated with the given entity if set.

--    Tag_Component (synthesized)
--       Applies to tagged record types, returns the entity for the _Tag
--       field in this record, which must be present.

--    Treat_As_Volatile (Flag41)
--       Present in all type entities, and also in constants, components and
--       variables. Set if this entity is to be treated as volatile for code
--       generation purposes. Always set if Is_Volatile is set, but can also
--       be set as a result of situations (such as address overlays) where
--       the front end wishes to force volatile handling to inhibit aliasing
--       optimization which might be legally ok, but is undesirable. Note
--       that the back end always tests this flag rather than Is_Volatile.
--       The front end tests Is_Volatile if it is concerned with legality
--       checks associated with declared volatile variables, but if the test
--       is for the purposes of suppressing optimizations, then the front
--       end should test Treat_As_Volatile rather than Is_Volatile.

--    Type_High_Bound (synthesized)
--       Applies to scalar types. Returns the tree node (Node_Id) that
--       contains the high bound of a scalar type. The returned value is a
--       literal for a base type, but may be an expression in the case of a
--       scalar type with dynamic bounds. Note that in the case of a fixed
--       point type, the high bound is in units of small, and is an integer.

--    Type_Low_Bound (synthesized)
--       Applies to scalar types. Returns the tree node (Node_Id) that
--       contains the low bound of a scalar type. The returned value is a
--       literal for a base type, but may be an expression in the case of a
--       scalar type with dynamic bounds. Note that in the case of a fixed
--       point type, the low bound is in units of small, and is an integer.

--    Underlying_Full_View (Node19)
--       Present in private subtypes that are the completion of other private
--       types, or in private types that are derived from private subtypes.
--       If the full view of a private type T is derived from another
--       private type with discriminants Td, the full view of T is also
--       private, and there is no way to attach to it a further full view that
--       would convey the structure of T to the back end. The Underlying_Full_
--       View is an attribute of the full view that is a subtype of Td with
--       the same constraint as the declaration for T. The declaration for this
--       subtype is built at the point of the declaration of T, either as a
--       completion, or as a subtype declaration where the base type is private
--       and has a private completion. If Td is already constrained, then its
--       full view can serve directly as the full view of T.

--    Underlying_Type (synthesized)
--       Applies to all entities. This is the identity function except in
--       the case where it is applied to an incomplete or private type,
--       in which case it is the underlying type of the type declared by
--       the completion, or Empty if the completion has not yet been
--       encountered and analyzed.
--
--       Note: the reason this attribute applies to all entities, and not
--       just types, is to legitimize code where Underlying_Type is applied
--       to an entity which may or may not be a type, with the intent that
--       if it is a type, its underlying type is taken.

--    Unset_Reference (Node16)
--       Present in variables and out parameters. This is normally Empty.
--       It is set to point to an identifier that represents a reference
--       to the entity before any value has been set. Only the first such
--       reference is identified. This field is used to generate a warning
--       message if necessary (see Sem_Warn.Check_Unset_Reference).

--    Uses_Sec_Stack (Flag95)
--       Present in scope entities (blocks,functions, procedures, tasks,
--       entries). Set to True when secondary stack is used in this scope and
--       must be released on exit unless Sec_Stack_Needed_For_Return is set.

--    Vax_Float (Flag151) [base type only]
--       Present in all type entities. Set only on the base type of float
--       types with Vax format. The particular format is determined by the
--       Digits_Value value which is 6,9,15 for F_Float, D_Float, G_Float.

--    Warnings_Off (Flag96)
--       Present in all entities. Set if a pragma Warnings (Off, entity-name)
--       is used to suppress warnings for a given entity. It is also used by
--       the compiler in some situations to kill spurious warnings.

   ------------------
   -- Access Kinds --
   ------------------

   --  The following three entity kinds are introduced by the corresponding
   --  type definitions:

   --    E_Access_Type,
   --    E_General_Access_Type,
   --    E_Anonymous_Access_Subprogram_Type,
   --    E_Anonymous_Access_Protected_Subprogram_Type
   --    E_Anonymous_Access_Type.

   --  In addition, we define the kind E_Allocator_Type to label
   --  allocators. This is because special resolution rules apply to this
   --  construct. Eventually the constructs are labeled with the access
   --  type imposed by the context. Gigi should never see the type
   --  E_Allocator.

   --  Similarly, the type E_Access_Attribute_Type is used as the initial
   --  kind associated with an access attribute. After resolution a specific
   --  access type will be established as determined by the context.

   --  Finally, the type Any_Access is used to label -null- during type
   --  resolution. Any_Access is also replaced by the context type after
   --  resolution.

   --------------------------------
   -- Classification of Entities --
   --------------------------------

   --  The classification of program entities which follows is a refinement of
   --  the list given in RM 3.1(1). E.g., separate entities denote subtypes of
   --  different type classes. Ada 95 entities include class wide types,
   --  protected types, subprogram types, generalized access types,  generic
   --  formal derived types and generic formal packages.

   --  The order chosen for these kinds allows us to classify related entities
   --  so that they are contiguous. As a result, they do not appear in the
   --  exact same order as their order of first appearance in the LRM (For
   --  example, private types are listed before packages). The contiguity
   --  allows us to define useful subtypes (see below) such as type entities,
   --  overloaded entities, etc.

   --  Each entity (explicitly or implicitly declared) has a kind, which is
   --  a value of the following type:

   type Entity_Kind is (

      E_Void,
      --  The initial Ekind value for a newly created entity. Also used as
      --  the Ekind for Standard_Void_Type, a type entity in Standard used
      --  as a dummy type for the return type of a procedure (the reason we
      --  create this type is to share the circuits for performing overload
      --  resolution on calls).

      -------------
      -- Objects --
      -------------

      E_Variable,
      --  Variables created by an object declaration with no constant keyword

      E_Component,
      --  Components of a record declaration, private declarations of
      --  protected objects.

      E_Constant,
      --  Constants created by an object declaration with a constant keyword

      E_Discriminant,
      --  A discriminant, created by the use of a discriminant in a type
      --  declaration.

      E_Loop_Parameter,
      --  A loop parameter created by a for loop

      ------------------------
      -- Parameter Entities --
      ------------------------

      --  Parameters are also objects

      E_In_Parameter,
      --  An in parameter of a subprogram or entry

      E_Out_Parameter,
      --  An out parameter of a subprogram or entry

      E_In_Out_Parameter,
      --  An in-out parameter of a subprogram or entry

      --------------------------------
      -- Generic Parameter Entities --
      --------------------------------

      --  Generic parameters are also objects

      E_Generic_In_Out_Parameter,
      --  A generic in out parameter, created by the use of a generic in out
      --  parameter in a generic declaration.

      E_Generic_In_Parameter,
      --  A generic in parameter, created by the use of a generic in
      --  parameter in a generic declaration.

      -------------------
      -- Named Numbers --
      -------------------

      E_Named_Integer,
      --  Named numbers created by a number declaration with an integer value

      E_Named_Real,
      --  Named numbers created by a number declaration with a real value

      -----------------------
      -- Enumeration Types --
      -----------------------

      E_Enumeration_Type,
      --  Enumeration types, created by an enumeration type declaration

      E_Enumeration_Subtype,
      --  Enumeration subtypes, created by an explicit or implicit subtype
      --  declaration applied to an enumeration type or subtype.

      -------------------
      -- Numeric Types --
      -------------------

      E_Signed_Integer_Type,
      --  Signed integer type, used for the anonymous base type of the
      --  integer subtype created by an integer type declaration.

      E_Signed_Integer_Subtype,
      --  Signed integer subtype, created by either an integer subtype or
      --  integer type declaration (in the latter case an integer type is
      --  created for the base type, and this is the first named subtype).

      E_Modular_Integer_Type,
      --  Modular integer type, used for the anonymous base type of the
      --  integer subtype created by a modular integer type declaration.

      E_Modular_Integer_Subtype,
      --  Modular integer subtype, created by either an modular subtype
      --  or modular type declaration (in the latter case a modular type
      --  is created for the base type, and this is the first named subtype).

      E_Ordinary_Fixed_Point_Type,
      --  Ordinary fixed type, used for the anonymous base type of the
      --  fixed subtype created by an ordinary fixed point type declaration.

      E_Ordinary_Fixed_Point_Subtype,
      --  Ordinary fixed point subtype, created by either an ordinary fixed
      --  point subtype or ordinary fixed point type declaration (in the
      --  latter case a fixed point type is created for the base type, and
      --  this is the first named subtype).

      E_Decimal_Fixed_Point_Type,
      --  Decimal fixed type, used for the anonymous base type of the decimal
      --  fixed subtype created by an ordinary fixed point type declaration.

      E_Decimal_Fixed_Point_Subtype,
      --  Decimal fixed point subtype, created by either a decimal fixed point
      --  subtype or decimal fixed point type declaration (in the latter case
      --  a fixed point type is created for the base type, and this is the
      --  first named subtype).

      E_Floating_Point_Type,
      --  Floating point type, used for the anonymous base type of the
      --  floating point subtype created by a floating point type declaration.

      E_Floating_Point_Subtype,
      --  Floating point subtype, created by either a floating point subtype
      --  or floating point type declaration (in the latter case a floating
      --  point type is created for the base type, and this is the first
      --  named subtype).

      ------------------
      -- Access Types --
      ------------------

      E_Access_Type,
      --  An access type created by an access type declaration with no all
      --  keyword present. Note that the predefined type Any_Access, which
      --  has E_Access_Type Ekind, is used to label NULL in the upwards pass
      --  of type analysis, to be replaced by the true access type in the
      --  downwards resolution pass.

      E_Access_Subtype,
      --  An access subtype created by a subtype declaration for any access
      --  type (whether or not it is a general access type).

      E_Access_Attribute_Type,
      --  An access type created for an access attribute (such as 'Access,
      --  'Unrestricted_Access and Unchecked_Access)

      E_Allocator_Type,
      --  A special internal type used to label allocators and attribute
      --  references using 'Access. This is needed because special resolution
      --  rules apply to these constructs. On the resolution pass, this type
      --  is always replaced by the actual access type, so Gigi should never
      --  see types with this Ekind.

      E_General_Access_Type,
      --  An access type created by an access type declaration with the all
      --  keyword present.

      E_Access_Subprogram_Type,
      --  An access to subprogram type, created by an access to subprogram
      --  declaration.

      E_Access_Protected_Subprogram_Type,
      --  An access to a protected subprogram, created by the corresponding
      --  declaration. Values of such a type denote both a protected object
      --  and a protected operation within, and have different compile-time
      --  and run-time properties than other access to subprograms.

      E_Anonymous_Access_Subprogram_Type,
      --  An anonymous access to subprogram type, created by an access to
      --  subprogram declaration.

      E_Anonymous_Access_Protected_Subprogram_Type,
      --  An anonymous access to protected subprogram type, created by an
      --  access to subprogram declaration.

      E_Anonymous_Access_Type,
      --  An anonymous access type created by an access parameter or access
      --  discriminant.

      ---------------------
      -- Composite Types --
      ---------------------

      E_Array_Type,
      --  An array type created by an array type declaration. Includes all
      --  cases of arrays, except for string types.

      E_Array_Subtype,
      --  An array subtype, created by an explicit array subtype declaration,
      --  or the use of an anonymous array subtype.

      E_String_Type,
      --  A string type, i.e. an array type whose component type is a character
      --  type, and for which string literals can thus be written.

      E_String_Subtype,
      --  A string subtype, created by an explicit subtype declaration for a
      --  string type, or the use of an anonymous subtype of a string type,

      E_String_Literal_Subtype,
      --  A special string subtype, used only to describe the type of a string
      --  literal (will always be one dimensional, with literal bounds).

      E_Class_Wide_Type,
      --  A class wide type, created by any tagged type declaration (i.e. if
      --  a tagged type is declared, the corresponding class type is always
      --  created, using this Ekind value).

      E_Class_Wide_Subtype,
      --  A subtype of a class wide type, created by a subtype declaration
      --  used to declare a subtype of a class type.

      E_Record_Type,
      --  A record type, created by a record type declaration

      E_Record_Subtype,
      --  A record subtype, created by a record subtype declaration.

      E_Record_Type_With_Private,
      --  Used for types defined by a private extension declaration, and
      --  for tagged private types. Includes the fields for both private
      --  types and for record types (with the sole exception of
      --  Corresponding_Concurrent_Type which is obviously not needed).
      --  This entity is considered to be both a record type and
      --  a private type.

      E_Record_Subtype_With_Private,
      --  A subtype of a type defined by a private extension declaration.

      E_Private_Type,
      --  A private type, created by a private type declaration
      --  that has neither the keyword limited nor the keyword tagged.

      E_Private_Subtype,
      --  A subtype of a private type, created by a subtype declaration used
      --  to declare a subtype of a private type.

      E_Limited_Private_Type,
      --  A limited private type, created by a private type declaration that
      --  has the keyword limited, but not the keyword tagged.

      E_Limited_Private_Subtype,
      --  A subtype of a limited private type, created by a subtype declaration
      --  used to declare a subtype of a limited private type.

      E_Incomplete_Type,
      --  An incomplete type, created by an incomplete type declaration

      E_Task_Type,
      --  A task type, created by a task type declaration. An entity with this
      --  Ekind is also created to describe the anonymous type of a task that
      --  is created by a single task declaration.

      E_Task_Subtype,
      --  A subtype of a task type, created by a subtype declaration used to
      --  declare a subtype of a task type.

      E_Protected_Type,
      --  A protected type, created by a protected type declaration. An entity
      --  with this Ekind is also created to describe the anonymous type of
      --  a protected object created by a single protected declaration.

      E_Protected_Subtype,
      --  A subtype of a protected type, created by a subtype declaration used
      --  to declare a subtype of a protected type.

      -----------------
      -- Other Types --
      -----------------

      E_Exception_Type,
      --  The type of an exception created by an exception declaration

      E_Subprogram_Type,
      --  This is the designated type of an Access_To_Subprogram. Has type
      --  and signature like a subprogram entity, so can appear in calls,
      --  which are resolved like regular calls, except that such an entity
      --  is not overloadable.

      ---------------------------
      -- Overloadable Entities --
      ---------------------------

      E_Enumeration_Literal,
      --  An enumeration literal, created by the use of the literal in an
      --  enumeration type definition.

      E_Function,
      --  A function, created by a function declaration or a function body
      --  that acts as its own declaration.

      E_Operator,
      --  A predefined operator, appearing in Standard, or an implicitly
      --  defined concatenation operator created whenever an array is
      --  declared. We do not make normal derived operators explicit in
      --  the tree, but the concatenation operators are made explicit.

      E_Procedure,
      --  A procedure, created by a procedure declaration or a procedure
      --  body that acts as its own declaration.

      E_Entry,
      --  An entry, created by an entry declaration in a task or protected
      --  object.

      --------------------
      -- Other Entities --
      --------------------

      E_Entry_Family,
      --  An entry family, created by an entry family declaration in a
      --  task or protected type definition.

      E_Block,
      --  A block identifier, created by an explicit or implicit label on
      --  a block or declare statement.

      E_Entry_Index_Parameter,
      --  An entry index parameter created by an entry index specification
      --  for the body of a protected entry family.

      E_Exception,
      --  An exception created by an exception declaration. The exception
      --  itself uses E_Exception for the Ekind, the implicit type that is
      --  created to represent its type uses the Ekind E_Exception_Type.

      E_Generic_Function,
      --  A generic function. This is the entity for a generic function
      --  created by a generic subprogram declaration.

      E_Generic_Procedure,
      --  A generic function. This is the entity for a generic procedure
      --  created by a generic subprogram declaration.

      E_Generic_Package,
      --  A generic package, this is the entity for a generic package created
      --  by a generic package declaration.

      E_Label,
      --  The defining entity for a label. Note that this is created by the
      --  implicit label declaration, not the occurrence of the label itself,
      --  which is simply a direct name referring to the label.

      E_Loop,
      --  A loop identifier, created by an explicit or implicit label on a
      --  loop statement.

      E_Package,
      --  A package, created by a package declaration

      E_Package_Body,
      --  A package body. This entity serves only limited functions, since
      --  most semantic analysis uses the package entity (E_Package). However
      --  there are some attributes that are significant for the body entity.
      --  For example, collection of exception handlers.

      E_Protected_Object,
      --  A protected object, created by an object declaration that declares
      --  an object of a protected type.

      E_Protected_Body,
      --  A protected body. This entity serves almost no function, since all
      --  semantic analysis uses the protected entity (E_Protected_Type)

      E_Task_Body,
      --  A task body. This entity serves almost no function, since all
      --  semantic analysis uses the protected entity (E_Task_Type).

      E_Subprogram_Body
      --  A subprogram body. Used when a subprogram has a separate declaration
      --  to represent the entity for the body. This entity serves almost no
      --  function, since all semantic analysis uses the subprogram entity
      --  for the declaration (E_Function or E_Procedure).
   );

   for Entity_Kind'Size use 8;
   --  The data structures in Atree assume this!

   --------------------------
   -- Subtype Declarations --
   --------------------------

   --  The above entities are arranged so that they can be conveniently
   --  grouped into subtype ranges. Note that for each of the xxx_Kind
   --  ranges defined below, there is a corresponding Is_xxx.. predicate
   --  which is to be used in preference to direct range tests using the
   --  subtype name. However, the subtype names are available for direct
   --  use, e.g. as choices in case statements.

   subtype Access_Kind                 is Entity_Kind range
       E_Access_Type ..
   --  E_Access_Subtype
   --  E_Access_Attribute_Type
   --  E_Allocator_Type
   --  E_General_Access_Type
   --  E_Access_Subprogram_Type
   --  E_Access_Protected_Subprogram_Type
   --  E_Anonymous_Access_Subprogram_Type
   --  E_Anonymous_Access_Protected_Subprogram_Type
       E_Anonymous_Access_Type;

   subtype Array_Kind                  is Entity_Kind range
       E_Array_Type ..
   --  E_Array_Subtype
   --  E_String_Type
   --  E_String_Subtype
       E_String_Literal_Subtype;

   subtype Class_Wide_Kind             is Entity_Kind range
       E_Class_Wide_Type ..
       E_Class_Wide_Subtype;

   subtype Composite_Kind              is Entity_Kind range
       E_Array_Type ..
   --  E_Array_Subtype
   --  E_String_Type
   --  E_String_Subtype
   --  E_String_Literal_Subtype
   --  E_Class_Wide_Type
   --  E_Class_Wide_Subtype
   --  E_Record_Type
   --  E_Record_Subtype
   --  E_Record_Type_With_Private
   --  E_Record_Subtype_With_Private
   --  E_Private_Type
   --  E_Private_Subtype
   --  E_Limited_Private_Type
   --  E_Limited_Private_Subtype
   --  E_Incomplete_Type
   --  E_Task_Type
   --  E_Task_Subtype,
   --  E_Protected_Type,
       E_Protected_Subtype;

   subtype Concurrent_Kind             is Entity_Kind range
       E_Task_Type ..
   --  E_Task_Subtype,
   --  E_Protected_Type,
       E_Protected_Subtype;

   subtype Concurrent_Body_Kind        is Entity_Kind range
       E_Protected_Body ..
       E_Task_Body;

   subtype Decimal_Fixed_Point_Kind    is Entity_Kind range
       E_Decimal_Fixed_Point_Type ..
       E_Decimal_Fixed_Point_Subtype;

   subtype Digits_Kind                 is Entity_Kind range
       E_Decimal_Fixed_Point_Type ..
   --  E_Decimal_Fixed_Point_Subtype
   --  E_Floating_Point_Type
       E_Floating_Point_Subtype;

   subtype Discrete_Kind               is Entity_Kind range
       E_Enumeration_Type ..
   --  E_Enumeration_Subtype
   --  E_Signed_Integer_Type
   --  E_Signed_Integer_Subtype
   --  E_Modular_Integer_Type
       E_Modular_Integer_Subtype;

   subtype Discrete_Or_Fixed_Point_Kind is Entity_Kind range
       E_Enumeration_Type ..
   --  E_Enumeration_Subtype
   --  E_Signed_Integer_Type
   --  E_Signed_Integer_Subtype
   --  E_Modular_Integer_Type
   --  E_Modular_Integer_Subtype
   --  E_Ordinary_Fixed_Point_Type
   --  E_Ordinary_Fixed_Point_Subtype
   --  E_Decimal_Fixed_Point_Type
       E_Decimal_Fixed_Point_Subtype;

   subtype Elementary_Kind             is Entity_Kind range
       E_Enumeration_Type ..
   --  E_Enumeration_Subtype
   --  E_Signed_Integer_Type
   --  E_Signed_Integer_Subtype
   --  E_Modular_Integer_Type
   --  E_Modular_Integer_Subtype
   --  E_Ordinary_Fixed_Point_Type
   --  E_Ordinary_Fixed_Point_Subtype
   --  E_Decimal_Fixed_Point_Type
   --  E_Decimal_Fixed_Point_Subtype
   --  E_Floating_Point_Type
   --  E_Floating_Point_Subtype
   --  E_Access_Type
   --  E_Access_Subtype
   --  E_Access_Attribute_Type
   --  E_Allocator_Type
   --  E_General_Access_Type
   --  E_Access_Subprogram_Type
   --  E_Access_Protected_Subprogram_Type
   --  E_Anonymous_Access_Subprogram_Type
   --  E_Anonymous_Access_Protected_Subprogram_Type
       E_Anonymous_Access_Type;

   subtype Enumeration_Kind            is Entity_Kind range
       E_Enumeration_Type ..
       E_Enumeration_Subtype;

   subtype Entry_Kind                  is Entity_Kind range
       E_Entry ..
       E_Entry_Family;

   subtype Fixed_Point_Kind            is Entity_Kind range
       E_Ordinary_Fixed_Point_Type ..
   --  E_Ordinary_Fixed_Point_Subtype
   --  E_Decimal_Fixed_Point_Type
       E_Decimal_Fixed_Point_Subtype;

   subtype Float_Kind                  is Entity_Kind range
       E_Floating_Point_Type ..
       E_Floating_Point_Subtype;

   subtype Formal_Kind                 is Entity_Kind range
       E_In_Parameter ..
   --  E_Out_Parameter
       E_In_Out_Parameter;

   subtype Generic_Subprogram_Kind     is Entity_Kind range
       E_Generic_Function ..
       E_Generic_Procedure;

   subtype Generic_Unit_Kind           is Entity_Kind range
       E_Generic_Function ..
   --  E_Generic_Procedure
       E_Generic_Package;

   subtype Incomplete_Or_Private_Kind  is Entity_Kind range
       E_Record_Type_With_Private ..
   --  E_Record_Subtype_With_Private
   --  E_Private_Type
   --  E_Private_Subtype
   --  E_Limited_Private_Type
   --  E_Limited_Private_Subtype
       E_Incomplete_Type;

   subtype Integer_Kind                is Entity_Kind range
       E_Signed_Integer_Type ..
   --  E_Signed_Integer_Subtype
   --  E_Modular_Integer_Type
       E_Modular_Integer_Subtype;

   subtype Modular_Integer_Kind        is Entity_Kind range
       E_Modular_Integer_Type ..
       E_Modular_Integer_Subtype;

   subtype Named_Kind                  is Entity_Kind range
       E_Named_Integer ..
       E_Named_Real;

   subtype Numeric_Kind                is Entity_Kind range
       E_Signed_Integer_Type ..
   --  E_Signed_Integer_Subtype
   --  E_Modular_Integer_Type
   --  E_Modular_Integer_Subtype
   --  E_Ordinary_Fixed_Point_Type
   --  E_Ordinary_Fixed_Point_Subtype
   --  E_Decimal_Fixed_Point_Type
   --  E_Decimal_Fixed_Point_Subtype
   --  E_Floating_Point_Type
       E_Floating_Point_Subtype;

   subtype Object_Kind                is Entity_Kind range
       E_Variable ..
   --  E_Component
   --  E_Constant
   --  E_Discriminant
   --  E_Loop_Parameter
   --  E_In_Parameter
   --  E_Out_Parameter
   --  E_In_Out_Parameter
   --  E_Generic_In_Out_Parameter
       E_Generic_In_Parameter;

   subtype Ordinary_Fixed_Point_Kind   is Entity_Kind range
       E_Ordinary_Fixed_Point_Type ..
       E_Ordinary_Fixed_Point_Subtype;

   subtype Overloadable_Kind           is Entity_Kind range
       E_Enumeration_Literal ..
   --  E_Function
   --  E_Operator
   --  E_Procedure
       E_Entry;

   subtype Private_Kind                is Entity_Kind range
       E_Record_Type_With_Private ..
   --  E_Record_Subtype_With_Private
   --  E_Private_Type
   --  E_Private_Subtype
   --  E_Limited_Private_Type
       E_Limited_Private_Subtype;

   subtype Protected_Kind              is Entity_Kind range
       E_Protected_Type ..
       E_Protected_Subtype;

   subtype Real_Kind                   is Entity_Kind range
       E_Ordinary_Fixed_Point_Type ..
   --  E_Ordinary_Fixed_Point_Subtype
   --  E_Decimal_Fixed_Point_Type
   --  E_Decimal_Fixed_Point_Subtype
   --  E_Floating_Point_Type
       E_Floating_Point_Subtype;

   subtype Record_Kind                 is Entity_Kind range
       E_Class_Wide_Type ..
   --  E_Class_Wide_Subtype
   --  E_Record_Type
   --  E_Record_Subtype
   --  E_Record_Type_With_Private
       E_Record_Subtype_With_Private;

   subtype Scalar_Kind                 is Entity_Kind range
       E_Enumeration_Type ..
   --  E_Enumeration_Subtype
   --  E_Signed_Integer_Type
   --  E_Signed_Integer_Subtype
   --  E_Modular_Integer_Type
   --  E_Modular_Integer_Subtype
   --  E_Ordinary_Fixed_Point_Type
   --  E_Ordinary_Fixed_Point_Subtype
   --  E_Decimal_Fixed_Point_Type
   --  E_Decimal_Fixed_Point_Subtype
   --  E_Floating_Point_Type
       E_Floating_Point_Subtype;

   subtype String_Kind                 is Entity_Kind range
       E_String_Type ..
   --  E_String_Subtype
       E_String_Literal_Subtype;

   subtype Subprogram_Kind             is Entity_Kind range
       E_Function ..
   --  E_Operator
       E_Procedure;

   subtype Signed_Integer_Kind         is Entity_Kind range
       E_Signed_Integer_Type ..
       E_Signed_Integer_Subtype;

   subtype Task_Kind                   is Entity_Kind range
       E_Task_Type ..
       E_Task_Subtype;

   subtype Type_Kind                   is Entity_Kind range
       E_Enumeration_Type ..
   --  E_Enumeration_Subtype
   --  E_Signed_Integer_Type
   --  E_Signed_Integer_Subtype
   --  E_Modular_Integer_Type
   --  E_Modular_Integer_Subtype
   --  E_Ordinary_Fixed_Point_Type
   --  E_Ordinary_Fixed_Point_Subtype
   --  E_Decimal_Fixed_Point_Type
   --  E_Decimal_Fixed_Point_Subtype
   --  E_Floating_Point_Type
   --  E_Floating_Point_Subtype
   --  E_Access_Type
   --  E_Access_Subtype
   --  E_Access_Attribute_Type
   --  E_Allocator_Type,
   --  E_General_Access_Type
   --  E_Access_Subprogram_Type,
   --  E_Access_Protected_Subprogram_Type
   --  E_Anonymous_Access_Subprogram_Type
   --  E_Anonymous_Access_Protected_Subprogram_Type
   --  E_Anonymous_Access_Type
   --  E_Array_Type
   --  E_Array_Subtype
   --  E_String_Type
   --  E_String_Subtype
   --  E_String_Literal_Subtype
   --  E_Class_Wide_Subtype
   --  E_Class_Wide_Type
   --  E_Record_Type
   --  E_Record_Subtype
   --  E_Record_Type_With_Private
   --  E_Record_Subtype_With_Private
   --  E_Private_Type
   --  E_Private_Subtype
   --  E_Limited_Private_Type
   --  E_Limited_Private_Subtype
   --  E_Incomplete_Type
   --  E_Task_Type
   --  E_Task_Subtype
   --  E_Protected_Type
   --  E_Protected_Subtype
   --  E_Exception_Type
       E_Subprogram_Type;

   --------------------------------------------------------
   -- Description of Defined Attributes for Entity_Kinds --
   --------------------------------------------------------

   --  For each enumeration value defined in Entity_Kind we list all the
   --  attributes defined in Einfo which can legally be applied to an entity
   --  of that kind. The implementation of the attribute functions (and for
   --  non-synthesized attributes, or the corresponding set procedures) are
   --  in the Einfo body.

   --  The following attributes apply to all entities

   --    Ekind                         (Ekind)

   --    Chars                         (Name1)
   --    Next_Entity                   (Node2)
   --    Scope                         (Node3)
   --    Homonym                       (Node4)
   --    Etype                         (Node5)
   --    First_Rep_Item                (Node6)
   --    Freeze_Node                   (Node7)

   --    Address_Taken                 (Flag104)
   --    Can_Never_Be_Null             (Flag38)
   --    Checks_May_Be_Suppressed      (Flag31)
   --    Debug_Info_Off                (Flag166)
   --    Has_Convention_Pragma         (Flag119)
   --    Has_Delayed_Freeze            (Flag18)
   --    Has_Fully_Qualified_Name      (Flag173)
   --    Has_Gigi_Rep_Item             (Flag82)
   --    Has_Homonym                   (Flag56)
   --    Has_Pragma_Elaborate_Body     (Flag150)
   --    Has_Pragma_Inline             (Flag157)
   --    Has_Pragma_Unreferenced       (Flag180)
   --    Has_Private_Declaration       (Flag155)
   --    Has_Qualified_Name            (Flag161)
   --    Has_Unknown_Discriminants     (Flag72)
   --    Has_Xref_Entry                (Flag182)
   --    Is_Ada_2005                   (Flag185)
   --    Is_Bit_Packed_Array           (Flag122)  (base type only)
   --    Is_Child_Unit                 (Flag73)
   --    Is_Compilation_Unit           (Flag149)
   --    Is_Completely_Hidden          (Flag103)
   --    Is_Discrim_SO_Function        (Flag176)
   --    Is_Dispatching_Operation      (Flag6)
   --    Is_Exported                   (Flag99)
   --    Is_First_Subtype              (Flag70)
   --    Is_Formal_Subprogram          (Flag111)
   --    Is_Generic_Instance           (Flag130)
   --    Is_Hidden                     (Flag57)
   --    Is_Hidden_Open_Scope          (Flag171)
   --    Is_Immediately_Visible        (Flag7)
   --    Is_Imported                   (Flag24)
   --    Is_Inlined                    (Flag11)
   --    Is_Internal                   (Flag17)
   --    Is_Itype                      (Flag91)
   --    Is_Known_Non_Null             (Flag37)
   --    Is_Known_Valid                (Flag170)
   --    Is_Limited_Composite          (Flag106)
   --    Is_Limited_Record             (Flag25)
   --    Is_Package_Body_Entity        (Flag160)
   --    Is_Packed_Array_Type          (Flag138)
   --    Is_Potentially_Use_Visible    (Flag9)
   --    Is_Preelaborated              (Flag59)
   --    Is_Public                     (Flag10)
   --    Is_Pure                       (Flag44)
   --    Is_Remote_Call_Interface      (Flag62)
   --    Is_Remote_Types               (Flag61)
   --    Is_Shared_Passive             (Flag60)
   --    Is_Statically_Allocated       (Flag28)
   --    Is_Unchecked_Union            (Flag117)
   --    Is_VMS_Exception              (Flag133)
   --    Kill_Elaboration_Checks       (Flag32)
   --    Kill_Range_Checks             (Flag33)
   --    Kill_Tag_Checks               (Flag34)
   --    Materialize_Entity            (Flag168)
   --    Needs_Debug_Info              (Flag147)
   --    Referenced                    (Flag156)
   --    Referenced_As_LHS             (Flag36)
   --    Suppress_Elaboration_Warnings (Flag148)
   --    Suppress_Style_Checks         (Flag165)

   --    Declaration_Node              (synth)
   --    Enclosing_Dynamic_Scope       (synth)
   --    Has_Foreign_Convention        (synth)
   --    Is_Dynamic_Scope              (synth)
   --    Is_Limited_Type               (synth)
   --    Underlying_Type               (synth)
   --    all classification attributes (synth)

   --  The following list of access functions applies to all entities for
   --  types and subtypes. References to this list appear subsequently as
   --  as "(plus type attributes)" for each appropriate Entity_Kind.

   --    Associated_Node_For_Itype     (Node8)
   --    Class_Wide_Type               (Node9)
   --    Referenced_Object             (Node10)
   --    Full_View                     (Node11)
   --    Esize                         (Uint12)
   --    RM_Size                       (Uint13)
   --    Alignment                     (Uint14)

   --    Depends_On_Private            (Flag14)
   --    Discard_Names                 (Flag88)
   --    Finalize_Storage_Only         (Flag158)  (base type only)
   --    From_With_Type                (Flag159)
   --    Has_Aliased_Components        (Flag135)  (base type only)
   --    Has_Alignment_Clause          (Flag46)
   --    Has_Atomic_Components         (Flag86)   (base type only)
   --    Has_Complex_Representation    (Flag140)  (base type only)
   --    Has_Discriminants             (Flag5)
   --    Has_Non_Standard_Rep          (Flag75)   (base type only)
   --    Has_Object_Size_Clause        (Flag172)
   --    Has_Primitive_Operations      (Flag120)  (base type only)
   --    Has_Size_Clause               (Flag29)
   --    Has_Specified_Layout          (Flag100)  (base type only)
   --    Has_Task                      (Flag30)   (base type only)
   --    Has_Unchecked_Union           (Flag123)  (base type only)
   --    Has_Volatile_Components       (Flag87)   (base type only)
   --    In_Use                        (Flag8)
   --    Is_Abstract                   (Flag19)
   --    Is_Asynchronous               (Flag81)
   --    Is_Atomic                     (Flag85)
   --    Is_Constr_Subt_For_U_Nominal  (Flag80)
   --    Is_Constr_Subt_For_UN_Aliased (Flag141)
   --    Is_Controlled                 (Flag42)   (base type only)
   --    Is_Eliminated                 (Flag124)
   --    Is_Frozen                     (Flag4)
   --    Is_Generic_Actual_Type        (Flag94)
   --    Is_Generic_Type               (Flag13)
   --    Is_Non_Static_Subtype         (Flag109)
   --    Is_Packed                     (Flag51)   (base type only)
   --    Is_Private_Composite          (Flag107)
   --    Is_Renaming_Of_Object         (Flag112)
   --    Is_Tagged_Type                (Flag55)
   --    Is_Unsigned_Type              (Flag144)
   --    Is_Volatile                   (Flag16)
   --    Must_Be_On_Byte_Boundary      (Flag183)
   --    Size_Depends_On_Discriminant  (Flag177)
   --    Size_Known_At_Compile_Time    (Flag92)
   --    Strict_Alignment              (Flag145)  (base type only)
   --    Suppress_Init_Proc            (Flag105)  (base type only)
   --    Treat_As_Volatile             (Flag41)

   --    Alignment_Clause              (synth)
   --    Ancestor_Subtype              (synth)
   --    Base_Type                     (synth)
   --    First_Subtype                 (synth)
   --    Has_Private_Ancestor          (synth)
   --    Implementation_Base_Type      (synth)
   --    Is_By_Copy_Type               (synth)
   --    Is_By_Reference_Type          (synth)
   --    Is_Return_By_Reference_Type   (synth)
   --    Root_Type                     (synth)
   --    Size_Clause                   (synth)

   ------------------------------------------
   -- Applicable attributes by entity kind --
   ------------------------------------------

   --  E_Access_Protected_Subprogram_Type
   --    Equivalent_Type               (Node18)
   --    Directly_Designated_Type      (Node20)
   --    Original_Access_Type          (Node21)
   --    Needs_No_Actuals              (Flag22)
   --    (plus type attributes)

   --  E_Access_Subprogram_Type
   --    Equivalent_Type               (Node18)   (remote types only)
   --    Directly_Designated_Type      (Node20)
   --    Original_Access_Type          (Node21)
   --    Needs_No_Actuals              (Flag22)
   --    (plus type attributes)

   --  E_Access_Type
   --  E_Access_Subtype
   --    Storage_Size_Variable         (Node15)   (base type only)
   --    Master_Id                     (Node17)
   --    Directly_Designated_Type      (Node20)
   --    Associated_Storage_Pool       (Node22)   (base type only)
   --    Associated_Final_Chain        (Node23)
   --    Has_Pragma_Controlled         (Flag27)   (base type only)
   --    Has_Storage_Size_Clause       (Flag23)   (base type only)
   --    Is_Access_Constant            (Flag69)
   --    No_Pool_Assigned              (Flag131)  (base type only)
   --    No_Strict_Aliasing            (Flag136)  (base type only)
   --    (plus type attributes)

   --  E_Access_Attribute_Type
   --    Directly_Designated_Type      (Node20)
   --    (plus type attributes)

   --  E_Allocator_Type
   --    Directly_Designated_Type      (Node20)
   --    (plus type attributes)

   --  E_Anonymous_Access_Subprogram_Type
   --  E_Anonymous_Access_Protected_Subprogram_Type
   --  E_Anonymous_Access_Type
   --    Storage_Size_Variable         (Node15)   ??? is this needed ???
   --    Directly_Designated_Type      (Node20)
   --    (plus type attributes)

   --  E_Array_Type
   --  E_Array_Subtype
   --    First_Index                   (Node17)
   --    Related_Array_Object          (Node19)
   --    Component_Type                (Node20)   (base type only)
   --    Original_Array_Type           (Node21)
   --    Component_Size                (Uint22)   (base type only)
   --    Packed_Array_Type             (Node23)
   --    Component_Alignment           (special)  (base type only)
   --    Has_Component_Size_Clause     (Flag68)   (base type only)
   --    Has_Controlled_Component      (Flag43)   (base type only)
   --    Has_Pragma_Pack               (Flag121)  (base type only)
   --    Is_Aliased                    (Flag15)
   --    Is_Constrained                (Flag12)
   --    Next_Index                    (synth)
   --    Number_Dimensions             (synth)
   --    (plus type attributes)

   --  E_Block
   --    Block_Node                    (Node11)
   --    First_Entity                  (Node17)
   --    Last_Entity                   (Node20)
   --    Delay_Cleanups                (Flag114)
   --    Discard_Names                 (Flag88)
   --    Finalization_Chain_Entity     (Node19)
   --    Scope_Depth_Value             (Uint22)
   --    Entry_Cancel_Parameter        (Node23)
   --    Has_Master_Entity             (Flag21)
   --    Has_Nested_Block_With_Handler (Flag101)
   --    Sec_Stack_Needed_For_Return   (Flag167)
   --    Uses_Sec_Stack                (Flag95)
   --    Scope_Depth                   (synth)

   --  E_Class_Wide_Type
   --  E_Class_Wide_Subtype
   --    Cloned_Subtype                (Node16)   (subtype case only)
   --    First_Entity                  (Node17)
   --    Equivalent_Type               (Node18)   (always Empty in type case)
   --    Last_Entity                   (Node20)
   --    Has_Controlled_Component      (Flag43)   (base type only)
   --    First_Component               (synth)
   --    (plus type attributes)

   --  E_Component
   --    Normalized_First_Bit          (Uint8)
   --    Current_Value                 (Node9)    (always Empty)
   --    Normalized_Position_Max       (Uint10)
   --    Component_Bit_Offset          (Uint11)
   --    Esize                         (Uint12)
   --    Component_Clause              (Node13)
   --    Normalized_Position           (Uint14)
   --    DT_Entry_Count                (Uint15)
   --    Entry_Formal                  (Node16)
   --    Prival                        (Node17)
   --    Renamed_Object                (Node18)   (always Empty)
   --    Discriminant_Checking_Func    (Node20)
   --    Interface_Name                (Node21)   (JGNAT usage only)
   --    Original_Record_Component     (Node22)
   --    Protected_Operation           (Node23)
   --    Has_Biased_Representation     (Flag139)
   --    Has_Per_Object_Constraint     (Flag154)
   --    Is_Atomic                     (Flag85)
   --    Is_Tag                        (Flag78)
   --    Is_Volatile                   (Flag16)
   --    Treat_As_Volatile             (Flag41)
   --    Is_Protected_Private          (synth)
   --    Next_Component                (synth)

   --  E_Constant
   --  E_Loop_Parameter
   --    Current_Value                 (Node9)    (always Empty)
   --    Discriminal_Link              (Node10)   (discriminals only)
   --    Full_View                     (Node11)
   --    Esize                         (Uint12)
   --    Alignment                     (Uint14)
   --    Actual_Subtype                (Node17)
   --    Renamed_Object                (Node18)
   --    Size_Check_Code               (Node19)   (constants only)
   --    Interface_Name                (Node21)
   --    Has_Alignment_Clause          (Flag46)
   --    Has_Atomic_Components         (Flag86)
   --    Has_Biased_Representation     (Flag139)
   --    Has_Completion                (Flag26)   (constants only)
   --    Has_Size_Clause               (Flag29)
   --    Has_Volatile_Components       (Flag87)
   --    Is_Atomic                     (Flag85)
   --    Is_Eliminated                 (Flag124)
   --    Is_True_Constant              (Flag163)
   --    Is_Volatile                   (Flag16)
   --    Never_Set_In_Source           (Flag115)
   --    Treat_As_Volatile             (Flag41)
   --    Address_Clause                (synth)
   --    Alignment_Clause              (synth)
   --    Constant_Value                (synth)
   --    Size_Clause                   (synth)

   --  E_Decimal_Fixed_Point_Type
   --  E_Decimal_Fixed_Subtype
   --    Scale_Value                   (Uint15)
   --    Digits_Value                  (Uint17)
   --    Scalar_Range                  (Node20)
   --    Delta_Value                   (Ureal18)
   --    Small_Value                   (Ureal21)
   --    Has_Machine_Radix_Clause      (Flag83)
   --    Machine_Radix_10              (Flag84)
   --    Type_Low_Bound                (synth)
   --    Type_High_Bound               (synth)
   --    (plus type attributes)

   --  E_Discriminant
   --    Normalized_First_Bit          (Uint8)
   --    Current_Value                 (Node9)    (always Empty)
   --    Normalized_Position_Max       (Uint10)
   --    Component_Bit_Offset          (Uint11)
   --    Esize                         (Uint12)
   --    Component_Clause              (Node13)
   --    Normalized_Position           (Uint14)
   --    Discriminant_Number           (Uint15)
   --    Discriminal                   (Node17)
   --    Renamed_Object                (Node18)   (always Empty)
   --    Corresponding_Discriminant    (Node19)
   --    Discriminant_Default_Value    (Node20)
   --    Interface_Name                (Node21)   (JGNAT usage only)
   --    Original_Record_Component     (Node22)
   --    CR_Discriminant               (Node23)
   --    Next_Discriminant             (synth)
   --    Next_Stored_Discriminant      (synth)

   --  E_Entry
   --  E_Entry_Family
   --    Protected_Body_Subprogram     (Node11)
   --    Barrier_Function              (Node12)
   --    Entry_Parameters_Type         (Node15)
   --    First_Entity                  (Node17)
   --    Alias                         (Node18)   (Entry only. Always empty)
   --    Finalization_Chain_Entity     (Node19)
   --    Last_Entity                   (Node20)
   --    Accept_Address                (Elist21)
   --    Scope_Depth_Value             (Uint22)
   --    Privals_Chain                 (Elist23)  (for a protected entry)
   --    Default_Expressions_Processed (Flag108)
   --    Entry_Accepted                (Flag152)
   --    Is_AST_Entry                  (Flag132)  (for entry only)
   --    Needs_No_Actuals              (Flag22)
   --    Sec_Stack_Needed_For_Return   (Flag167)
   --    Uses_Sec_Stack                (Flag95)
   --    Address_Clause                (synth)
   --    First_Formal                  (synth)
   --    Entry_Index_Type              (synth)
   --    Number_Formals                (synth)
   --    Scope_Depth                   (synth)

   --  E_Entry_Index_Parameter
   --    Entry_Index_Constant          (Node18)

   --  E_Enumeration_Literal
   --    Enumeration_Pos               (Uint11)
   --    Enumeration_Rep               (Uint12)
   --    Debug_Renaming_Link           (Node13)
   --    Alias                         (Node18)
   --    Enumeration_Rep_Expr          (Node22)
   --    Next_Literal                  (synth)

   --  E_Enumeration_Type
   --  E_Enumeration_Subtype
   --    Lit_Indexes                   (Node15)   (root type only)
   --    Lit_Strings                   (Node16)   (root type only)
   --    First_Literal                 (Node17)
   --    Scalar_Range                  (Node20)
   --    Enum_Pos_To_Rep               (Node23)   (type only, not subtype)
   --    Has_Biased_Representation     (Flag139)
   --    Has_Contiguous_Rep            (Flag181)
   --    Has_Enumeration_Rep_Clause    (Flag66)
   --    Nonzero_Is_True               (Flag162)  (base type only)
   --    Type_Low_Bound                (synth)
   --    Type_High_Bound               (synth)
   --    (plus type attributes)

   --  E_Exception
   --    Alignment                     (Uint14)
   --    Renamed_Entity                (Node18)
   --    Register_Exception_Call       (Node20)
   --    Interface_Name                (Node21)
   --    Exception_Code                (Uint22)
   --    Discard_Names                 (Flag88)
   --    Is_VMS_Exception              (Flag133)

   --  E_Exception_Type
   --    Equivalent_Type               (Node18)
   --    (plus type attributes)

   --  E_Floating_Point_Type
   --  E_Floating_Point_Subtype
   --    Digits_Value                  (Uint17)
   --    Scalar_Range                  (Node20)
   --    Type_Low_Bound                (synth)
   --    Type_High_Bound               (synth)
   --    (plus type attributes)

   --  E_Function
   --  E_Generic_Function
   --    Mechanism                     (Uint8)    (returns Mechanism_Type)
   --    Renaming_Map                  (Uint9)
   --    Handler_Records               (List10)   (non-generic case only)
   --    Protected_Body_Subprogram     (Node11)
   --    Next_Inlined_Subprogram       (Node12)
   --    Corresponding_Equality        (Node13)   (implicit /= only)
   --    Elaboration_Entity            (Node13)   (all other cases)
   --    First_Optional_Parameter      (Node14)   (non-generic case only)
   --    DT_Position                   (Uint15)
   --    DTC_Entity                    (Node16)
   --    First_Entity                  (Node17)
   --    Alias                         (Node18)   (non-generic case only)
   --    Renamed_Entity                (Node18)   (generic case only)
   --    Finalization_Chain_Entity     (Node19)
   --    Last_Entity                   (Node20)
   --    Interface_Name                (Node21)
   --    Scope_Depth_Value             (Uint22)
   --    Generic_Renamings             (Elist23)  (for an instance)
   --    Inner_Instances               (Elist23)  (for a generic function)
   --    Privals_Chain                 (Elist23)  (for a protected function)
   --    Obsolescent_Warning           (Node24)
   --    Body_Needed_For_SAL           (Flag40)
   --    Elaboration_Entity_Required   (Flag174)
   --    Function_Returns_With_DSP     (Flag169)
   --    Default_Expressions_Processed (Flag108)
   --    Delay_Cleanups                (Flag114)
   --    Delay_Subprogram_Descriptors  (Flag50)
   --    Discard_Names                 (Flag88)
   --    Elaborate_All_Desirable       (Flag146)
   --    Has_Completion                (Flag26)
   --    Has_Controlling_Result        (Flag98)
   --    Has_Master_Entity             (Flag21)
   --    Has_Missing_Return            (Flag142)
   --    Has_Nested_Block_With_Handler (Flag101)
   --    Has_Pragma_Pure_Function      (Flag179)  (non-generic case only)
   --    Has_Recursive_Call            (Flag143)
   --    Has_Subprogram_Descriptor     (Flag93)
   --    Is_Abstract                   (Flag19)
   --    Is_Called                     (Flag102)  (non-generic case only)
   --    Is_Constructor                (Flag76)
   --    Is_Discrim_SO_Function        (Flag176)
   --    Is_Eliminated                 (Flag124)
   --    Is_Instantiated               (Flag126)  (generic case only)
   --    Is_Intrinsic_Subprogram       (Flag64)
   --    Is_Machine_Code_Subprogram    (Flag137)  (non-generic case only)
   --    Is_Obsolescent                (Flag153)
   --    Is_Overriding_Operation       (Flag39)   (non-generic case only)
   --    Is_Private_Descendant         (Flag53)
   --    Is_Pure                       (Flag44)
   --    Is_Thread_Body                (Flag77)   (non-generic case only)
   --    Is_Visible_Child_Unit         (Flag116)
   --    Needs_No_Actuals              (Flag22)
   --    Return_Present                (Flag54)
   --    Returns_By_Ref                (Flag90)
   --    Sec_Stack_Needed_For_Return   (Flag167)
   --    Uses_Sec_Stack                (Flag95)
   --    Address_Clause                (synth)
   --    First_Formal                  (synth)
   --    Number_Formals                (synth)
   --    Scope_Depth                   (synth)

   --  E_General_Access_Type
   --    Storage_Size_Variable         (Node15)   (base type only)
   --    Master_Id                     (Node17)
   --    Directly_Designated_Type      (Node20)
   --    Associated_Storage_Pool       (Node22)   (base type only)
   --    Associated_Final_Chain        (Node23)
   --    (plus type attributes)

   --  E_Generic_In_Parameter
   --  E_Generic_In_Out_Parameter
   --    Current_Value                 (Node9)    (always Empty)
   --    Entry_Component               (Node11)
   --    Actual_Subtype                (Node17)
   --    Renamed_Object                (Node18)   (always Empty)
   --    Default_Value                 (Node20)
   --    Protected_Formal              (Node22)
   --    Is_Controlling_Formal         (Flag97)
   --    Is_Entry_Formal               (Flag52)
   --    Parameter_Mode                (synth)

   --  E_Incomplete_Type
   --    Non_Limited_View              (Node17)
   --    Private_Dependents            (Elist18)
   --    Discriminant_Constraint       (Elist21)
   --    Stored_Constraint             (Elist23)
   --    First_Discriminant            (synth)
   --    First_Stored_Discriminant     (synth)
   --    (plus type attributes)

   --  E_In_Parameter
   --  E_In_Out_Parameter
   --  E_Out_Parameter
   --    Mechanism                     (Uint8)    (returns Mechanism_Type)
   --    Current_Value                 (Node9)    (always Empty for IN case)
   --    Discriminal_Link              (Node10)   (discriminals only)
   --    Entry_Component               (Node11)
   --    Esize                         (Uint12)
   --    Extra_Accessibility           (Node13)
   --    Alignment                     (Uint14)
   --    Extra_Formal                  (Node15)
   --    Unset_Reference               (Node16)
   --    Actual_Subtype                (Node17)
   --    Renamed_Object                (Node18)
   --    Spec_Entity                   (Node19)
   --    Default_Value                 (Node20)
   --    Default_Expr_Function         (Node21)
   --    Protected_Formal              (Node22)
   --    Extra_Constrained             (Node23)
   --    Is_Controlling_Formal         (Flag97)
   --    Is_Entry_Formal               (Flag52)
   --    Is_Optional_Parameter         (Flag134)
   --    Never_Set_In_Source           (Flag115)
   --    Parameter_Mode                (synth)

   --  E_Label
   --    Enclosing_Scope               (Node18)
   --    Reachable                     (Flag49)

   --  E_Limited_Private_Type
   --  E_Limited_Private_Subtype
   --    First_Entity                  (Node17)
   --    Private_Dependents            (Elist18)
   --    Underlying_Full_View          (Node19)
   --    Last_Entity                   (Node20)
   --    Discriminant_Constraint       (Elist21)
   --    Private_View                  (Node22)
   --    Stored_Constraint             (Elist23)
   --    Has_Completion                (Flag26)
   --    Has_Completion_In_Body        (Flag71)
   --    First_Discriminant            (synth)
   --    First_Stored_Discriminant     (synth)
   --    (plus type attributes)

   --  E_Loop
   --    Has_Exit                      (Flag47)
   --    Has_Master_Entity             (Flag21)
   --    Has_Nested_Block_With_Handler (Flag101)

   --  E_Modular_Integer_Type
   --  E_Modular_Integer_Subtype
   --    Modulus                       (Uint17)    (base type only)
   --    Original_Array_Type           (Node21)
   --    Scalar_Range                  (Node20)
   --    Non_Binary_Modulus            (Flag58)    (base type only)
   --    Has_Biased_Representation     (Flag139)
   --    Type_Low_Bound                (synth)
   --    Type_High_Bound               (synth)
   --    (plus type attributes)

   --  E_Named_Integer
   --    Constant_Value                (synth)

   --  E_Named_Real
   --    Constant_Value                (synth)

   --  E_Operator
   --    First_Entity                  (Node17)
   --    Alias                         (Node18)
   --    Last_Entity                   (Node20)
   --    Is_Machine_Code_Subprogram    (Flag137)
   --    Is_Pure                       (Flag44)
   --    Is_Intrinsic_Subprogram       (Flag64)
   --    Is_Overriding_Operation       (Flag39)
   --    Default_Expressions_Processed (Flag108)
   --    Has_Pragma_Pure_Function      (Flag179)

   --  E_Ordinary_Fixed_Point_Type
   --  E_Ordinary_Fixed_Point_Subtype
   --    Delta_Value                   (Ureal18)
   --    Scalar_Range                  (Node20)
   --    Small_Value                   (Ureal21)
   --    Has_Small_Clause              (Flag67)
   --    Type_Low_Bound                (synth)
   --    Type_High_Bound               (synth)
   --    (plus type attributes)

   --  E_Package
   --  E_Generic_Package
   --    Dependent_Instances           (Elist8)   (for an instance)
   --    Renaming_Map                  (Uint9)
   --    Handler_Records               (List10)   (non-generic case only)
   --    Generic_Homonym               (Node11)   (generic case only)
   --    Associated_Formal_Package     (Node12)
   --    Elaboration_Entity            (Node13)
   --    Shadow_Entities               (List14)
   --    Related_Instance              (Node15)   (non-generic case only)
   --    First_Private_Entity          (Node16)
   --    First_Entity                  (Node17)
   --    Renamed_Entity                (Node18)
   --    Body_Entity                   (Node19)
   --    Last_Entity                   (Node20)
   --    Interface_Name                (Node21)
   --    Scope_Depth_Value             (Uint22)
   --    Generic_Renamings             (Elist23)  (for an instance)
   --    Inner_Instances               (Elist23)  (generic case only)
   --    Limited_View                  (Node23)   (non-generic, not instance)
   --    Delay_Subprogram_Descriptors  (Flag50)
   --    Body_Needed_For_SAL           (Flag40)
   --    Discard_Names                 (Flag88)
   --    Elaborate_All_Desirable       (Flag146)
   --    Elaboration_Entity_Required   (Flag174)
   --    From_With_Type                (Flag159)
   --    Has_All_Calls_Remote          (Flag79)
   --    Has_Completion                (Flag26)
   --    Has_Forward_Instantiation     (Flag175)
   --    Has_Master_Entity             (Flag21)
   --    Has_Subprogram_Descriptor     (Flag93)
   --    In_Package_Body               (Flag48)
   --    In_Private_Part               (Flag45)
   --    In_Use                        (Flag8)
   --    Is_Instantiated               (Flag126)
   --    Is_Private_Descendant         (Flag53)
   --    Is_Visible_Child_Unit         (Flag116)
   --    Is_Wrapper_Package            (synth)    (non-generic case only)
   --    Scope_Depth                   (synth)

   --  E_Package_Body
   --    Handler_Records               (List10)   (non-generic case only)
   --    Related_Instance              (Node15)   (non-generic case only)
   --    First_Entity                  (Node17)
   --    Spec_Entity                   (Node19)
   --    Last_Entity                   (Node20)
   --    Scope_Depth_Value             (Uint22)
   --    Scope_Depth                   (synth)
   --    Delay_Subprogram_Descriptors  (Flag50)
   --    Has_Subprogram_Descriptor     (Flag93)

   --  E_Private_Type
   --  E_Private_Subtype
   --    Primitive_Operations          (Elist15)
   --    First_Entity                  (Node17)
   --    Private_Dependents            (Elist18)
   --    Underlying_Full_View          (Node19)
   --    Last_Entity                   (Node20)
   --    Discriminant_Constraint       (Elist21)
   --    Private_View                  (Node22)
   --    Stored_Constraint             (Elist23)
   --    Has_Completion                (Flag26)
   --    Has_Completion_In_Body        (Flag71)
   --    Is_Controlled                 (Flag42)   (base type only)
   --    Is_For_Access_Subtype         (Flag118)  (subtype only)
   --    First_Discriminant            (synth)
   --    First_Stored_Discriminant     (synth)
   --    (plus type attributes)

   --  E_Procedure
   --  E_Generic_Procedure
   --    Renaming_Map                  (Uint9)
   --    Handler_Records               (List10)   (non-generic case only)
   --    Protected_Body_Subprogram     (Node11)
   --    Next_Inlined_Subprogram       (Node12)
   --    Elaboration_Entity            (Node13)
   --    First_Optional_Parameter      (Node14)   (non-generic case only)
   --    DT_Position                   (Uint15)
   --    DTC_Entity                    (Node16)
   --    First_Entity                  (Node17)
   --    Alias                         (Node18)   (non-generic case only)
   --    Renamed_Entity                (Node18)   (generic case only)
   --    Finalization_Chain_Entity     (Node19)
   --    Last_Entity                   (Node20)
   --    Interface_Name                (Node21)
   --    Scope_Depth_Value             (Uint22)
   --    Scope_Depth                   (synth)
   --    Generic_Renamings             (Elist23)  (for an instance)
   --    Inner_Instances               (Elist23)  (for a generic procedure)
   --    Privals_Chain                 (Elist23)  (for a protected procedure)
   --    Obsolescent_Warning           (Node24)
   --    Body_Needed_For_SAL           (Flag40)
   --    Elaboration_Entity_Required   (Flag174)
   --    Function_Returns_With_DSP     (Flag169)  (always False for procedure)
   --    Default_Expressions_Processed (Flag108)
   --    Delay_Cleanups                (Flag114)
   --    Delay_Subprogram_Descriptors  (Flag50)
   --    Discard_Names                 (Flag88)
   --    Elaborate_All_Desirable       (Flag146)
   --    Has_Completion                (Flag26)
   --    Has_Master_Entity             (Flag21)
   --    Has_Nested_Block_With_Handler (Flag101)
   --    Has_Pragma_Pure_Function      (Flag179)  (non-generic case only)
   --    Has_Subprogram_Descriptor     (Flag93)
   --    Is_Visible_Child_Unit         (Flag116)
   --    Is_Abstract                   (Flag19)
   --    Is_Asynchronous               (Flag81)
   --    Is_Called                     (Flag102)  (non-generic subprogram)
   --    Is_Constructor                (Flag76)
   --    Is_Eliminated                 (Flag124)
   --    Is_Instantiated               (Flag126)  (generic case only)
   --    Is_Interrupt_Handler          (Flag89)
   --    Is_Intrinsic_Subprogram       (Flag64)
   --    Is_Machine_Code_Subprogram    (Flag137)  (non-generic case only)
   --    Is_Null_Init_Proc             (Flag178)
   --    Is_Obsolescent                (Flag153)
   --    Is_Overriding_Operation       (Flag39)   (non-generic case only)
   --    Is_Private_Descendant         (Flag53)
   --    Is_Pure                       (Flag44)
   --    Is_Thread_Body                (Flag77)   (non-generic case only)
   --    Is_Valued_Procedure           (Flag127)
   --    Is_Visible_Child_Unit         (Flag116)
   --    Needs_No_Actuals              (Flag22)
   --    No_Return                     (Flag113)
   --    Sec_Stack_Needed_For_Return   (Flag167)
   --    Address_Clause                (synth)
   --    First_Formal                  (synth)
   --    Number_Formals                (synth)

   --  E_Protected_Body
   --    Object_Ref                    (Node17)
   --    (any others??? First/Last Entity, Scope_Depth???)

   --  E_Protected_Object

   --  E_Protected_Type
   --  E_Protected_Subtype
   --    Entry_Bodies_Array            (Node15)
   --    First_Private_Entity          (Node16)
   --    First_Entity                  (Node17)
   --    Corresponding_Record_Type     (Node18)
   --    Finalization_Chain_Entity     (Node19)
   --    Last_Entity                   (Node20)
   --    Discriminant_Constraint       (Elist21)
   --    Scope_Depth_Value             (Uint22)
   --    Scope_Depth                   (synth)
   --    Stored_Constraint             (Elist23)
   --    Has_Controlled_Component      (Flag43)   (base type only)
   --    Has_Interrupt_Handler         (synth)
   --    Sec_Stack_Needed_For_Return   (Flag167) ???
   --    Uses_Sec_Stack                (Flag95) ???
   --    Has_Entries                   (synth)
   --    Number_Entries                (synth)

   --  E_Record_Type
   --  E_Record_Subtype
   --    Primitive_Operations          (Elist15)
   --    Access_Disp_Table             (Node16)   (base type only)
   --    Cloned_Subtype                (Node16)   (subtype case only)
   --    First_Entity                  (Node17)
   --    Corresponding_Concurrent_Type (Node18)
   --    Parent_Subtype                (Node19)
   --    Last_Entity                   (Node20)
   --    Discriminant_Constraint       (Elist21)
   --    Corresponding_Remote_Type     (Node22)
   --    Stored_Constraint             (Elist23)
   --    Component_Alignment           (special)  (base type only)
   --    C_Pass_By_Copy                (Flag125)  (base type only)
   --    Has_Controlled_Component      (Flag43)   (base type only)
   --    Has_External_Tag_Rep_Clause   (Flag110)
   --    Has_Record_Rep_Clause         (Flag65)   (base type only)
   --    Is_Class_Wide_Equivalent_Type (Flag35)
   --    Is_Concurrent_Record_Type     (Flag20)
   --    Is_Constrained                (Flag12)
   --    Is_Controlled                 (Flag42)   (base type only)
   --    Reverse_Bit_Order             (Flag164)  (base type only)
   --    First_Component               (synth)
   --    First_Discriminant            (synth)
   --    First_Stored_Discriminant     (synth)
   --    Tag_Component                 (synth)
   --    (plus type attributes)

   --  E_Record_Type_With_Private
   --  E_Record_Subtype_With_Private
   --    Primitive_Operations          (Elist15)
   --    Access_Disp_Table             (Node16)   (base type only)
   --    First_Entity                  (Node17)
   --    Private_Dependents            (Elist18)
   --    Underlying_Full_View          (Node19)
   --    Last_Entity                   (Node20)
   --    Discriminant_Constraint       (Elist21)
   --    Private_View                  (Node22)
   --    Stored_Constraint             (Elist23)
   --    Has_Completion                (Flag26)
   --    Has_Completion_In_Body        (Flag71)
   --    Has_Controlled_Component      (Flag43)   (base type only)
   --    Has_Record_Rep_Clause         (Flag65)   (base type only)
   --    Has_External_Tag_Rep_Clause   (Flag110)
   --    Is_Concurrent_Record_Type     (Flag20)
   --    Is_Constrained                (Flag12)
   --    Is_Controlled                 (Flag42)   (base type only)
   --    Reverse_Bit_Order             (Flag164)  (base type only)
   --    First_Component               (synth)
   --    First_Discriminant            (synth)
   --    First_Stored_Discriminant     (synth)
   --    Tag_Component                 (synth)
   --    (plus type attributes)

   --  E_Signed_Integer_Type
   --  E_Signed_Integer_Subtype
   --    Scalar_Range                  (Node20)
   --    Has_Biased_Representation     (Flag139)
   --    Type_Low_Bound                (synth)
   --    Type_High_Bound               (synth)
   --    (plus type attributes)

   --  E_String_Type
   --  E_String_Subtype
   --    First_Index                   (Node17)
   --    Component_Type                (Node20)   (base type only)
   --    Is_Constrained                (Flag12)
   --    Next_Index                    (synth)
   --    Number_Dimensions             (synth)
   --    (plus type attributes)

   --  E_String_Literal_Subtype
   --    String_Literal_Low_Bound      (Node15)
   --    String_Literal_Length         (Uint16)
   --    First_Index                   (Node17)   (always Empty)
   --    Packed_Array_Type             (Node23)
   --    (plus type attributes)

   --  E_Subprogram_Body
   --    Mechanism                     (Uint8)
   --    First_Entity                  (Node17)
   --    Last_Entity                   (Node20)
   --    Scope_Depth_Value             (Uint22)
   --    Scope_Depth                   (synth)

   --  E_Subprogram_Type
   --    Directly_Designated_Type      (Node20)
   --    First_Formal                  (synth)
   --    Number_Formals                (synth)
   --    Function_Returns_With_DSP     (Flag169)
   --    (plus type attributes)

   --  E_Task_Body
   --    (any others??? First/Last Entity, Scope_Depth???)

   --  E_Task_Type
   --  E_Task_Subtype
   --    Storage_Size_Variable         (Node15)   (base type only)
   --    First_Private_Entity          (Node16)
   --    First_Entity                  (Node17)
   --    Corresponding_Record_Type     (Node18)
   --    Finalization_Chain_Entity     (Node19)
   --    Last_Entity                   (Node20)
   --    Discriminant_Constraint       (Elist21)
   --    Scope_Depth_Value             (Uint22)
   --    Scope_Depth                   (synth)
   --    Stored_Constraint             (Elist23)
   --    Delay_Cleanups                (Flag114)
   --    Has_Master_Entity             (Flag21)
   --    Has_Storage_Size_Clause       (Flag23)   (base type only)
   --    Uses_Sec_Stack                (Flag95)  ???
   --    Sec_Stack_Needed_For_Return   (Flag167) ???
   --    Has_Entries                   (synth)
   --    Number_Entries                (synth)
   --    (plus type attributes)

   --  E_Variable
   --    Hiding_Loop_Variable          (Node8)
   --    Current_Value                 (Node9)
   --    Esize                         (Uint12)
   --    Extra_Accessibility           (Node13)
   --    Alignment                     (Uint14)
   --    Shared_Var_Read_Proc          (Node15)
   --    Unset_Reference               (Node16)
   --    Actual_Subtype                (Node17)
   --    Renamed_Object                (Node18)
   --    Size_Check_Code               (Node19)
   --    Interface_Name                (Node21)
   --    Shared_Var_Assign_Proc        (Node22)
   --    Extra_Constrained             (Node23)
   --    Has_Alignment_Clause          (Flag46)
   --    Has_Atomic_Components         (Flag86)
   --    Has_Biased_Representation     (Flag139)
   --    Has_Size_Clause               (Flag29)
   --    Has_Volatile_Components       (Flag87)
   --    Is_Atomic                     (Flag85)
   --    Is_Eliminated                 (Flag124)
   --    Is_Shared_Passive             (Flag60)
   --    Is_True_Constant              (Flag163)
   --    Is_Volatile                   (Flag16)
   --    Never_Set_In_Source           (Flag115)
   --    Treat_As_Volatile             (Flag41)
   --    Address_Clause                (synth)
   --    Alignment_Clause              (synth)
   --    Constant_Value                (synth)
   --    Size_Clause                   (synth)

   --  E_Void
   --    Since E_Void is the initial Ekind value of an entity when it is first
   --    created, one might expect that no attributes would be defined on such
   --    an entity until its Ekind field is set. However, in practice, there
   --    are many instances in which fields of an E_Void entity are set in the
   --    code prior to setting the Ekind field. This is not well documented or
   --    well controlled, and needs cleaning up later. Meanwhile, the access
   --    procedures in the body of Einfo permit many, but not all, attributes
   --    to be applied to an E_Void entity, precisely so that this kind of
   --    pre-setting of attributes works. This is really a hole in the dynamic
   --    type checking, since there is no assurance that the eventual Ekind
   --    value will be appropriate for the attributes set, and the consequence
   --    is that the dynamic type checking in the Einfo body is unnecessarily
   --    weak. To be looked at systematically some time ???

   ---------------------------------
   -- Component_Alignment Control --
   ---------------------------------

   --  There are four types of alignment possible for array and record
   --  types, and a field in the type entities contains a value of the
   --  following type indicating which alignment choice applies. For full
   --  details of the meaning of these aligment types, see description
   --  of the Component_Alignment pragma

   type Component_Alignment_Kind is (
      Calign_Default,          -- default alignment
      Calign_Component_Size,   -- natural alignment for component size
      Calign_Component_Size_4, -- natural for size <= 4, 4 for size >= 4
      Calign_Storage_Unit);    -- all components byte aligned

   ---------------
   -- Iterators --
   ---------------

   --  In addition to attributes that are stored as plain data, other
   --  attributes are procedural, and require some small amount of
   --  computation. Of course, from the point of view of a user of this
   --  package, the distinction is not visible (even the field information
   --  provided below should be disregarded, as it is subject to  change
   --  without notice!). A number of  attributes appear as lists: lists of
   --  formals,  lists of actuals, of discriminants, etc. For these, pairs
   --  of functions are defined, which take the form:

   --      function First_Thing (E : Enclosing_Construct) return Thing;
   --      function Next_Thing (T : Thing) return Thing;

   --  The end of iteration is always signaled by a value of Empty, so that
   --  loops over these chains invariably have the form:

   --      This : Thing;
   --      ...
   --      This := First_Thing (E);

   --      while Present (This) loop
   --         Do_Something_With (This);
   --        ...
   --        This := Next_Thing (This);
   --      end loop;

   -----------------------------------
   -- Handling of Check Suppression --
   -----------------------------------

   --  There are three ways that checks can be suppressed:

   --    1.  At the command line level
   --    2.  At the scope level.
   --    3.  At the entity level.

   --  See spec of Sem in sem.ads for details of the data structures used
   --  to keep track of these various methods for suppressing checks.

   -------------------------------
   -- Handling of Discriminants --
   -------------------------------

   --  During semantic processing, discriminants are separate entities which
   --  reflect the semantic properties and allowed usage of discriminants in
   --  the language.

   --  In the case of discriminants used as bounds, the references are handled
   --  directly, since special processing is needed in any case. However, there
   --  are two circumstances in which discriminants are referenced in a quite
   --  general manner, like any other variables:

   --     In initialization expressions for records. Note that the expressions
   --     used in Priority, Storage_Size, and Task_Info pragmas are effectively
   --     in this category, since these pragmas are converted to initialized
   --     record fields in the Corresponding_Record_Type.

   --     In task and protected bodies, where the discriminant values may be
   --     referenced freely within these bodies. Discriminants can also appear
   --     in bounds of entry families and in defaults of operations.

   --  In both these cases, the discriminants must be treated essentially as
   --  objects. The following approach is used to simplify and minimize the
   --  special processing that is required.

   --  When a record type with discriminants is processed, the semantic
   --  processing creates the entities for the discriminants. It also creates
   --  an additional set of entities, called discriminals, one for each of
   --  the discriminants, and the Discriminal field of the discriminant entity
   --  points to this additional entity, which is initially created as an
   --  uninitialized (E_Void) entity.

   --  During expansion of expressions, any discriminant reference is replaced
   --  by a reference to the corresponding discriminal. When the initialization
   --  procedure for the record is created (there will always be one, since
   --  discriminants are present, see Exp_Ch3 for further details), the
   --  discriminals are used as the entities for the formal parameters of
   --  this initialization procedure. The references to these discriminants
   --  have already been replaced by references to these discriminals, which
   --  are now the formal parameters corresponding to the required objects.

   --  In the case of a task or protected body, the semantics similarly
   --  creates a set of discriminals for the discriminants of the task or
   --  protected type. When the procedure is created for the task body,
   --  the parameter passed in is a reference to the task value type, which
   --  contains the required discriminant values. The expander creates a
   --  set of declarations of the form:

   --      discriminal : constant dtype renames _Task.discriminant;

   --  where discriminal is the discriminal entity referenced by the task
   --  discriminant, and _Task is the task value passed in as the parameter.
   --  Again, any references to discriminants in the task body have been
   --  replaced by the discriminal reference, which is now an object that
   --  contains the required value.

   --  This approach for tasks means that two sets of discriminals are needed
   --  for a task type, one for the initialization procedure, and one for the
   --  task body. This works out nicely, since the semantics allocates one set
   --  for the task itself, and one set for the corresponding record.

   --  The one bit of trickiness arises in making sure that the right set of
   --  discriminals is used at the right time. First the task definition is
   --  processed. Any references to discriminants here are replaced by the
   --  the corresponding *task* discriminals (the record type doesn't even
   --  exist yet, since it is constructed as part of the expansion of the
   --  task declaration, which happens after the semantic processing of the
   --  task definition). The discriminants to be used for the corresponding
   --  record are created at the same time as the other discriminals, and
   --  held in the CR_Discriminant field of the discriminant. A use of the
   --  discriminant in a bound for an entry family is replaced with the CR_
   --  discriminant because it controls the bound of the entry queue array
   --  which is a component of the corresponding record.

   --  Just before the record initialization routine is constructed, the
   --  expander exchanges the task and record discriminals. This has two
   --  effects. First the generation of the record initialization routine
   --  uses the discriminals that are now on the record, which is the set
   --  that used to be on the task, which is what we want.

   --  Second, a new set of (so far unused) discriminals is now on the task
   --  discriminants, and it is this set that will be used for expanding the
   --  task body, and also for the discriminal declarations at the start of
   --  the task body.

   ---------------------------------------
   -- Private data in protected objects --
   ---------------------------------------

   --  Private object declarations in protected types pose problems
   --  similar to those of discriminants. They are expanded to components
   --  of a record which is passed as the parameter "_object" to expanded
   --  forms of all protected operations. As with discriminants, timing
   --  of this expansion is a problem. The sequence of statements for a
   --  protected operation is expanded before the operation itself, so the
   --  formal parameter for the record object containing the private data
   --  does not exist when the references to that data are expanded.

   --  For this reason, private data is handled in the same way as
   --  discriminants, expanding references to private data in protected
   --  operations (which appear as components) to placeholders which will
   --  eventually become renamings of the private selected components
   --  of the "_object" formal parameter. These placeholders are called
   --  "privals", by analogy to the "discriminals" used to implement
   --  discriminants. They are attached to the component declaration nodes
   --  representing the private object declarations of the protected type.

   --  As with discriminals, each protected subprogram needs a unique set
   --  of privals, since they must refer to renamings of components of a
   --  formal parameter of that operation. Entry bodies need another set,
   --  which they all share and which is associated with renamings in the
   --  Service_Entries procedure for the protected type (this is not yet
   --  implemented???). This means that we must associate a new set of
   --  privals (and discriminals) with the private declarations after
   --  the body of a protected subprogram is processed.

   --  The last complication is the presence of discriminants and discriminated
   --  components. In the corresponding record, the components are constrained
   --  by the discriminants of the record, but within each protected operation
   --  they are constrained by the discriminants of the actual. The actual
   --  subtypes of those components are constructed as for other unconstrained
   --  formals, but the privals are created before the formal object is added
   --  to the parameter list of the protected operation, so they carry the
   --  nominal subtype of the original component. After the protected operation
   --  is actually created (in  the expansion of the protected body) we must
   --  patch the types of each prival occurrence with the proper actual subtype
   --  which is by now set. The Privals_Chain is used for this patching.

   -------------------
   -- Type Synonyms --
   -------------------

   --  The following type synonyms are used to tidy up the function and
   --  procedure declarations that follow, and also to make it possible
   --  to meet the requirement for the XEINFO utility that all function
   --  specs must fit on a single source line.

   subtype B is Boolean;
   subtype C is Component_Alignment_Kind;
   subtype E is Entity_Id;
   subtype M is Mechanism_Type;
   subtype N is Node_Id;
   subtype U is Uint;
   subtype R is Ureal;
   subtype L is Elist_Id;
   subtype S is List_Id;

   --------------------------------
   -- Attribute Access Functions --
   --------------------------------

   --  All attributes are manipulated through a procedural interface. This
   --  section contains the functions used to obtain attribute values which
   --  correspond to values in fields or flags in the entity itself.

   function Accept_Address                     (Id : E) return L;
   function Access_Disp_Table                  (Id : E) return E;
   function Actual_Subtype                     (Id : E) return E;
   function Address_Taken                      (Id : E) return B;
   function Alias                              (Id : E) return E;
   function Alignment                          (Id : E) return U;
   function Associated_Final_Chain             (Id : E) return E;
   function Associated_Formal_Package          (Id : E) return E;
   function Associated_Node_For_Itype          (Id : E) return N;
   function Associated_Storage_Pool            (Id : E) return E;
   function Barrier_Function                   (Id : E) return N;
   function Block_Node                         (Id : E) return N;
   function Body_Entity                        (Id : E) return E;
   function Body_Needed_For_SAL                (Id : E) return B;
   function CR_Discriminant                    (Id : E) return E;
   function C_Pass_By_Copy                     (Id : E) return B;
   function Can_Never_Be_Null                  (Id : E) return B;
   function Checks_May_Be_Suppressed           (Id : E) return B;
   function Class_Wide_Type                    (Id : E) return E;
   function Cloned_Subtype                     (Id : E) return E;
   function Component_Alignment                (Id : E) return C;
   function Component_Clause                   (Id : E) return N;
   function Component_Bit_Offset               (Id : E) return U;
   function Component_Size                     (Id : E) return U;
   function Component_Type                     (Id : E) return E;
   function Corresponding_Concurrent_Type      (Id : E) return E;
   function Corresponding_Discriminant         (Id : E) return E;
   function Corresponding_Equality             (Id : E) return E;
   function Corresponding_Record_Type          (Id : E) return E;
   function Corresponding_Remote_Type          (Id : E) return E;
   function Current_Value                      (Id : E) return N;
   function Debug_Info_Off                     (Id : E) return B;
   function Debug_Renaming_Link                (Id : E) return E;
   function DTC_Entity                         (Id : E) return E;
   function DT_Entry_Count                     (Id : E) return U;
   function DT_Position                        (Id : E) return U;
   function Default_Expr_Function              (Id : E) return E;
   function Default_Expressions_Processed      (Id : E) return B;
   function Default_Value                      (Id : E) return N;
   function Delay_Cleanups                     (Id : E) return B;
   function Delay_Subprogram_Descriptors       (Id : E) return B;
   function Delta_Value                        (Id : E) return R;
   function Dependent_Instances                (Id : E) return L;
   function Depends_On_Private                 (Id : E) return B;
   function Digits_Value                       (Id : E) return U;
   function Directly_Designated_Type           (Id : E) return E;
   function Discard_Names                      (Id : E) return B;
   function Discriminal                        (Id : E) return E;
   function Discriminal_Link                   (Id : E) return E;
   function Discriminant_Checking_Func         (Id : E) return E;
   function Discriminant_Constraint            (Id : E) return L;
   function Discriminant_Default_Value         (Id : E) return N;
   function Discriminant_Number                (Id : E) return U;
   function Elaborate_All_Desirable            (Id : E) return B;
   function Elaboration_Entity                 (Id : E) return E;
   function Elaboration_Entity_Required        (Id : E) return B;
   function Enclosing_Scope                    (Id : E) return E;
   function Entry_Accepted                     (Id : E) return B;
   function Entry_Bodies_Array                 (Id : E) return E;
   function Entry_Cancel_Parameter             (Id : E) return E;
   function Entry_Component                    (Id : E) return E;
   function Entry_Formal                       (Id : E) return E;
   function Entry_Index_Constant               (Id : E) return E;
   function Entry_Index_Type                   (Id : E) return E;
   function Entry_Parameters_Type              (Id : E) return E;
   function Enum_Pos_To_Rep                    (Id : E) return E;
   function Enumeration_Pos                    (Id : E) return U;
   function Enumeration_Rep                    (Id : E) return U;
   function Enumeration_Rep_Expr               (Id : E) return N;
   function Equivalent_Type                    (Id : E) return E;
   function Esize                              (Id : E) return U;
   function Exception_Code                     (Id : E) return U;
   function Extra_Accessibility                (Id : E) return E;
   function Extra_Constrained                  (Id : E) return E;
   function Extra_Formal                       (Id : E) return E;
   function Finalization_Chain_Entity          (Id : E) return E;
   function Finalize_Storage_Only              (Id : E) return B;
   function First_Entity                       (Id : E) return E;
   function First_Index                        (Id : E) return N;
   function First_Literal                      (Id : E) return E;
   function First_Optional_Parameter           (Id : E) return E;
   function First_Private_Entity               (Id : E) return E;
   function First_Rep_Item                     (Id : E) return N;
   function Freeze_Node                        (Id : E) return N;
   function From_With_Type                     (Id : E) return B;
   function Full_View                          (Id : E) return E;
   function Function_Returns_With_DSP          (Id : E) return B;
   function Generic_Homonym                    (Id : E) return E;
   function Generic_Renamings                  (Id : E) return L;
   function Handler_Records                    (Id : E) return S;
   function Has_Aliased_Components             (Id : E) return B;
   function Has_Alignment_Clause               (Id : E) return B;
   function Has_All_Calls_Remote               (Id : E) return B;
   function Has_Atomic_Components              (Id : E) return B;
   function Has_Biased_Representation          (Id : E) return B;
   function Has_Completion                     (Id : E) return B;
   function Has_Completion_In_Body             (Id : E) return B;
   function Has_Complex_Representation         (Id : E) return B;
   function Has_Component_Size_Clause          (Id : E) return B;
   function Has_Contiguous_Rep                 (Id : E) return B;
   function Has_Controlled_Component           (Id : E) return B;
   function Has_Controlling_Result             (Id : E) return B;
   function Has_Convention_Pragma              (Id : E) return B;
   function Has_Delayed_Freeze                 (Id : E) return B;
   function Has_Discriminants                  (Id : E) return B;
   function Has_Enumeration_Rep_Clause         (Id : E) return B;
   function Has_Exit                           (Id : E) return B;
   function Has_External_Tag_Rep_Clause        (Id : E) return B;
   function Has_Fully_Qualified_Name           (Id : E) return B;
   function Has_Gigi_Rep_Item                  (Id : E) return B;
   function Has_Homonym                        (Id : E) return B;
   function Has_Interrupt_Handler              (Id : E) return B;
   function Has_Machine_Radix_Clause           (Id : E) return B;
   function Has_Master_Entity                  (Id : E) return B;
   function Has_Missing_Return                 (Id : E) return B;
   function Has_Nested_Block_With_Handler      (Id : E) return B;
   function Has_Forward_Instantiation          (Id : E) return B;
   function Has_Non_Standard_Rep               (Id : E) return B;
   function Has_Object_Size_Clause             (Id : E) return B;
   function Has_Per_Object_Constraint          (Id : E) return B;
   function Has_Pragma_Controlled              (Id : E) return B;
   function Has_Pragma_Elaborate_Body          (Id : E) return B;
   function Has_Pragma_Inline                  (Id : E) return B;
   function Has_Pragma_Pack                    (Id : E) return B;
   function Has_Pragma_Pure_Function           (Id : E) return B;
   function Has_Pragma_Unreferenced            (Id : E) return B;
   function Has_Primitive_Operations           (Id : E) return B;
   function Has_Qualified_Name                 (Id : E) return B;
   function Has_Record_Rep_Clause              (Id : E) return B;
   function Has_Recursive_Call                 (Id : E) return B;
   function Has_Size_Clause                    (Id : E) return B;
   function Has_Small_Clause                   (Id : E) return B;
   function Has_Specified_Layout               (Id : E) return B;
   function Has_Storage_Size_Clause            (Id : E) return B;
   function Has_Stream_Size_Clause             (Id : E) return B;
   function Has_Subprogram_Descriptor          (Id : E) return B;
   function Has_Task                           (Id : E) return B;
   function Has_Unchecked_Union                (Id : E) return B;
   function Has_Unknown_Discriminants          (Id : E) return B;
   function Has_Volatile_Components            (Id : E) return B;
   function Has_Xref_Entry                     (Id : E) return B;
   function Hiding_Loop_Variable               (Id : E) return E;
   function Homonym                            (Id : E) return E;
   function In_Package_Body                    (Id : E) return B;
   function In_Private_Part                    (Id : E) return B;
   function In_Use                             (Id : E) return B;
   function Inner_Instances                    (Id : E) return L;
   function Interface_Name                     (Id : E) return N;
   function Is_AST_Entry                       (Id : E) return B;
   function Is_Abstract                        (Id : E) return B;
   function Is_Access_Constant                 (Id : E) return B;
   function Is_Ada_2005                        (Id : E) return B;
   function Is_Aliased                         (Id : E) return B;
   function Is_Asynchronous                    (Id : E) return B;
   function Is_Atomic                          (Id : E) return B;
   function Is_Bit_Packed_Array                (Id : E) return B;
   function Is_CPP_Class                       (Id : E) return B;
   function Is_Called                          (Id : E) return B;
   function Is_Character_Type                  (Id : E) return B;
   function Is_Child_Unit                      (Id : E) return B;
   function Is_Class_Wide_Equivalent_Type      (Id : E) return B;
   function Is_Compilation_Unit                (Id : E) return B;
   function Is_Completely_Hidden               (Id : E) return B;
   function Is_Constr_Subt_For_UN_Aliased      (Id : E) return B;
   function Is_Constr_Subt_For_U_Nominal       (Id : E) return B;
   function Is_Constrained                     (Id : E) return B;
   function Is_Constructor                     (Id : E) return B;
   function Is_Controlled                      (Id : E) return B;
   function Is_Controlling_Formal              (Id : E) return B;
   function Is_Discrim_SO_Function             (Id : E) return B;
   function Is_Dispatching_Operation           (Id : E) return B;
   function Is_Eliminated                      (Id : E) return B;
   function Is_Entry_Formal                    (Id : E) return B;
   function Is_Exported                        (Id : E) return B;
   function Is_First_Subtype                   (Id : E) return B;
   function Is_For_Access_Subtype              (Id : E) return B;
   function Is_Frozen                          (Id : E) return B;
   function Is_Generic_Instance                (Id : E) return B;
   function Is_Hidden                          (Id : E) return B;
   function Is_Hidden_Open_Scope               (Id : E) return B;
   function Is_Immediately_Visible             (Id : E) return B;
   function Is_Imported                        (Id : E) return B;
   function Is_Inlined                         (Id : E) return B;
   function Is_Instantiated                    (Id : E) return B;
   function Is_Internal                        (Id : E) return B;
   function Is_Interrupt_Handler               (Id : E) return B;
   function Is_Intrinsic_Subprogram            (Id : E) return B;
   function Is_Itype                           (Id : E) return B;
   function Is_Known_Non_Null                  (Id : E) return B;
   function Is_Known_Valid                     (Id : E) return B;
   function Is_Limited_Composite               (Id : E) return B;
   function Is_Machine_Code_Subprogram         (Id : E) return B;
   function Is_Non_Static_Subtype              (Id : E) return B;
   function Is_Null_Init_Proc                  (Id : E) return B;
   function Is_Obsolescent                     (Id : E) return B;
   function Is_Optional_Parameter              (Id : E) return B;
   function Is_Package_Body_Entity             (Id : E) return B;
   function Is_Packed                          (Id : E) return B;
   function Is_Packed_Array_Type               (Id : E) return B;
   function Is_Potentially_Use_Visible         (Id : E) return B;
   function Is_Preelaborated                   (Id : E) return B;
   function Is_Private_Composite               (Id : E) return B;
   function Is_Private_Descendant              (Id : E) return B;
   function Is_Public                          (Id : E) return B;
   function Is_Pure                            (Id : E) return B;
   function Is_Remote_Call_Interface           (Id : E) return B;
   function Is_Remote_Types                    (Id : E) return B;
   function Is_Renaming_Of_Object              (Id : E) return B;
   function Is_Shared_Passive                  (Id : E) return B;
   function Is_Statically_Allocated            (Id : E) return B;
   function Is_Tag                             (Id : E) return B;
   function Is_Tagged_Type                     (Id : E) return B;
   function Is_Thread_Body                     (Id : E) return B;
   function Is_True_Constant                   (Id : E) return B;
   function Is_Unchecked_Union                 (Id : E) return B;
   function Is_Unsigned_Type                   (Id : E) return B;
   function Is_VMS_Exception                   (Id : E) return B;
   function Is_Valued_Procedure                (Id : E) return B;
   function Is_Visible_Child_Unit              (Id : E) return B;
   function Is_Volatile                        (Id : E) return B;
   function Is_Wrapper_Package                 (Id : E) return B;
   function Kill_Elaboration_Checks            (Id : E) return B;
   function Kill_Range_Checks                  (Id : E) return B;
   function Kill_Tag_Checks                    (Id : E) return B;
   function Last_Entity                        (Id : E) return E;
   function Limited_View                       (Id : E) return E;
   function Lit_Indexes                        (Id : E) return E;
   function Lit_Strings                        (Id : E) return E;
   function Machine_Radix_10                   (Id : E) return B;
   function Master_Id                          (Id : E) return E;
   function Materialize_Entity                 (Id : E) return B;
   function Mechanism                          (Id : E) return M;
   function Modulus                            (Id : E) return U;
   function Must_Be_On_Byte_Boundary           (Id : E) return B;
   function Needs_Debug_Info                   (Id : E) return B;
   function Needs_No_Actuals                   (Id : E) return B;
   function Never_Set_In_Source                (Id : E) return B;
   function Next_Inlined_Subprogram            (Id : E) return E;
   function No_Pool_Assigned                   (Id : E) return B;
   function No_Return                          (Id : E) return B;
   function No_Strict_Aliasing                 (Id : E) return B;
   function Non_Binary_Modulus                 (Id : E) return B;
   function Non_Limited_View                   (Id : E) return E;
   function Nonzero_Is_True                    (Id : E) return B;
   function Normalized_First_Bit               (Id : E) return U;
   function Normalized_Position                (Id : E) return U;
   function Normalized_Position_Max            (Id : E) return U;
   function Object_Ref                         (Id : E) return E;
   function Obsolescent_Warning                (Id : E) return N;
   function Original_Access_Type               (Id : E) return E;
   function Original_Array_Type                (Id : E) return E;
   function Original_Record_Component          (Id : E) return E;
   function Packed_Array_Type                  (Id : E) return E;
   function Parent_Subtype                     (Id : E) return E;
   function Primitive_Operations               (Id : E) return L;
   function Prival                             (Id : E) return E;
   function Privals_Chain                      (Id : E) return L;
   function Private_Dependents                 (Id : E) return L;
   function Private_View                       (Id : E) return N;
   function Protected_Body_Subprogram          (Id : E) return E;
   function Protected_Formal                   (Id : E) return E;
   function Protected_Operation                (Id : E) return E;
   function RM_Size                            (Id : E) return U;
   function Reachable                          (Id : E) return B;
   function Referenced                         (Id : E) return B;
   function Referenced_As_LHS                  (Id : E) return B;
   function Referenced_Object                  (Id : E) return N;
   function Register_Exception_Call            (Id : E) return N;
   function Related_Array_Object               (Id : E) return E;
   function Related_Instance                   (Id : E) return E;
   function Renamed_Entity                     (Id : E) return N;
   function Renamed_Object                     (Id : E) return N;
   function Renaming_Map                       (Id : E) return U;
   function Return_Present                     (Id : E) return B;
   function Returns_By_Ref                     (Id : E) return B;
   function Reverse_Bit_Order                  (Id : E) return B;
   function Scalar_Range                       (Id : E) return N;
   function Scale_Value                        (Id : E) return U;
   function Scope_Depth_Value                  (Id : E) return U;
   function Sec_Stack_Needed_For_Return        (Id : E) return B;
   function Shadow_Entities                    (Id : E) return S;
   function Shared_Var_Assign_Proc             (Id : E) return E;
   function Shared_Var_Read_Proc               (Id : E) return E;
   function Size_Check_Code                    (Id : E) return N;
   function Size_Known_At_Compile_Time         (Id : E) return B;
   function Size_Depends_On_Discriminant       (Id : E) return B;
   function Small_Value                        (Id : E) return R;
   function Spec_Entity                        (Id : E) return E;
   function Storage_Size_Variable              (Id : E) return E;
   function Stored_Constraint                  (Id : E) return L;
   function Strict_Alignment                   (Id : E) return B;
   function String_Literal_Length              (Id : E) return U;
   function String_Literal_Low_Bound           (Id : E) return N;
   function Suppress_Elaboration_Warnings      (Id : E) return B;
   function Suppress_Init_Proc                 (Id : E) return B;
   function Suppress_Style_Checks              (Id : E) return B;
   function Treat_As_Volatile                  (Id : E) return B;
   function Underlying_Full_View               (Id : E) return E;
   function Unset_Reference                    (Id : E) return N;
   function Uses_Sec_Stack                     (Id : E) return B;
   function Vax_Float                          (Id : E) return B;
   function Warnings_Off                       (Id : E) return B;

   -------------------------------
   -- Classification Attributes --
   -------------------------------

   --  These functions provide a convenient functional notation for testing
   --  whether an Ekind value belongs to a specified kind, for example the
   --  function Is_Elementary_Type tests if its argument is in Elementary_Kind.
   --  In some cases, the test is of an entity attribute (e.g. in the case of
   --  Is_Generic_Type where the Ekind does not provide the needed information)

   function Is_Access_Type                     (Id : E) return B;
   function Is_Array_Type                      (Id : E) return B;
   function Is_Class_Wide_Type                 (Id : E) return B;
   function Is_Composite_Type                  (Id : E) return B;
   function Is_Concurrent_Body                 (Id : E) return B;
   function Is_Concurrent_Record_Type          (Id : E) return B;
   function Is_Concurrent_Type                 (Id : E) return B;
   function Is_Decimal_Fixed_Point_Type        (Id : E) return B;
   function Is_Digits_Type                     (Id : E) return B;
   function Is_Discrete_Or_Fixed_Point_Type    (Id : E) return B;
   function Is_Discrete_Type                   (Id : E) return B;
   function Is_Elementary_Type                 (Id : E) return B;
   function Is_Entry                           (Id : E) return B;
   function Is_Enumeration_Type                (Id : E) return B;
   function Is_Fixed_Point_Type                (Id : E) return B;
   function Is_Floating_Point_Type             (Id : E) return B;
   function Is_Formal                          (Id : E) return B;
   function Is_Formal_Subprogram               (Id : E) return B;
   function Is_Generic_Actual_Type             (Id : E) return B;
   function Is_Generic_Unit                    (Id : E) return B;
   function Is_Generic_Type                    (Id : E) return B;
   function Is_Generic_Subprogram              (Id : E) return B;
   function Is_Incomplete_Or_Private_Type      (Id : E) return B;
   function Is_Integer_Type                    (Id : E) return B;
   function Is_Limited_Record                  (Id : E) return B;
   function Is_Modular_Integer_Type            (Id : E) return B;
   function Is_Named_Number                    (Id : E) return B;
   function Is_Numeric_Type                    (Id : E) return B;
   function Is_Object                          (Id : E) return B;
   function Is_Ordinary_Fixed_Point_Type       (Id : E) return B;
   function Is_Overloadable                    (Id : E) return B;
   function Is_Overriding_Operation            (Id : E) return B;
   function Is_Private_Type                    (Id : E) return B;
   function Is_Protected_Type                  (Id : E) return B;
   function Is_Real_Type                       (Id : E) return B;
   function Is_Record_Type                     (Id : E) return B;
   function Is_Scalar_Type                     (Id : E) return B;
   function Is_Signed_Integer_Type             (Id : E) return B;
   function Is_Subprogram                      (Id : E) return B;
   function Is_Task_Type                       (Id : E) return B;
   function Is_Type                            (Id : E) return B;

   -------------------------------------
   -- Synthesized Attribute Functions --
   -------------------------------------

   --  The functions in this section synthesize attributes from the tree,
   --  so they do not correspond to defined fields in the entity itself.

   function Address_Clause                     (Id : E) return N;
   function Alignment_Clause                   (Id : E) return N;
   function Ancestor_Subtype                   (Id : E) return E;
   function Base_Type                          (Id : E) return E;
   function Constant_Value                     (Id : E) return N;
   function Declaration_Node                   (Id : E) return N;
   function Designated_Type                    (Id : E) return E;
   function Enclosing_Dynamic_Scope            (Id : E) return E;
   function First_Component                    (Id : E) return E;
   function First_Discriminant                 (Id : E) return E;
   function First_Formal                       (Id : E) return E;
   function First_Stored_Discriminant          (Id : E) return E;
   function First_Subtype                      (Id : E) return E;
   function Has_Attach_Handler                 (Id : E) return B;
   function Has_Entries                        (Id : E) return B;
   function Has_Foreign_Convention             (Id : E) return B;
   function Has_Private_Ancestor               (Id : E) return B;
   function Has_Private_Declaration            (Id : E) return B;
   function Implementation_Base_Type           (Id : E) return E;
   function Is_Always_Inlined                  (Id : E) return B;
   function Is_Boolean_Type                    (Id : E) return B;
   function Is_By_Copy_Type                    (Id : E) return B;
   function Is_By_Reference_Type               (Id : E) return B;
   function Is_Derived_Type                    (Id : E) return B;
   function Is_Dynamic_Scope                   (Id : E) return B;
   function Is_Indefinite_Subtype              (Id : E) return B;
   function Is_Limited_Type                    (Id : E) return B;
   function Is_Package                         (Id : E) return B;
   function Is_Protected_Private               (Id : E) return B;
   function Is_Protected_Record_Type           (Id : E) return B;
   function Is_Return_By_Reference_Type        (Id : E) return B;
   function Is_String_Type                     (Id : E) return B;
   function Is_Task_Record_Type                (Id : E) return B;
   function Next_Component                     (Id : E) return E;
   function Next_Discriminant                  (Id : E) return E;
   function Next_Formal                        (Id : E) return E;
   function Next_Formal_With_Extras            (Id : E) return E;
   function Next_Literal                       (Id : E) return E;
   function Next_Stored_Discriminant           (Id : E) return E;
   function Number_Dimensions                  (Id : E) return Pos;
   function Number_Discriminants               (Id : E) return Pos;
   function Number_Entries                     (Id : E) return Nat;
   function Number_Formals                     (Id : E) return Pos;
   function Parameter_Mode                     (Id : E) return Formal_Kind;
   function Root_Type                          (Id : E) return E;
   function Scope_Depth_Set                    (Id : E) return B;
   function Size_Clause                        (Id : E) return N;
   function Stream_Size_Clause                 (Id : E) return N;
   function Tag_Component                      (Id : E) return E;
   function Type_High_Bound                    (Id : E) return N;
   function Type_Low_Bound                     (Id : E) return N;
   function Underlying_Type                    (Id : E) return E;

   ----------------------------------------------
   -- Type Representation Attribute Predicates --
   ----------------------------------------------

   --  These predicates test the setting of the indicated attribute. If
   --  the value has been set, then Known is True, and Unknown is False.
   --  If no value is set, then Known is False and Unknown is True. The
   --  Known_Static predicate is true only if the value is set (Known)
   --  and is set to a compile time known value. Note that in the case
   --  of Alignment and Normalized_First_Bit, dynamic values are not
   --  possible, so we do not need a separate Known_Static calls in
   --  these cases. The not set (unknown values are as follows:

   --    Alignment               Uint_0 or No_Uint
   --    Component_Size          Uint_0 or No_Uint
   --    Component_Bit_Offset    No_Uint
   --    Digits_Value            Uint_0 or No_Uint
   --    Esize                   Uint_0 or No_Uint
   --    Normalized_First_Bit    No_Uint
   --    Normalized_Position     No_Uint
   --    Normalized_Position_Max No_Uint
   --    RM_Size                 Uint_0 or No_Uint

   --  It would be cleaner to use No_Uint in all these cases, but historically
   --  we chose to use Uint_0 at first, and the change over will take time ???
   --  This is particularly true for the RM_Size field, where a value of zero
   --  is legitimate. We deal with this by a nasty kludge that knows that the
   --  value is always known static for discrete types (and no other types can
   --  have an RM_Size value of zero).

   function Known_Alignment                       (E : Entity_Id) return B;
   function Known_Component_Bit_Offset            (E : Entity_Id) return B;
   function Known_Component_Size                  (E : Entity_Id) return B;
   function Known_Esize                           (E : Entity_Id) return B;
   function Known_Normalized_First_Bit            (E : Entity_Id) return B;
   function Known_Normalized_Position             (E : Entity_Id) return B;
   function Known_Normalized_Position_Max         (E : Entity_Id) return B;
   function Known_RM_Size                         (E : Entity_Id) return B;

   function Known_Static_Component_Bit_Offset     (E : Entity_Id) return B;
   function Known_Static_Component_Size           (E : Entity_Id) return B;
   function Known_Static_Esize                    (E : Entity_Id) return B;
   function Known_Static_Normalized_First_Bit     (E : Entity_Id) return B;
   function Known_Static_Normalized_Position      (E : Entity_Id) return B;
   function Known_Static_Normalized_Position_Max  (E : Entity_Id) return B;
   function Known_Static_RM_Size                  (E : Entity_Id) return B;

   function Unknown_Alignment                     (E : Entity_Id) return B;
   function Unknown_Component_Bit_Offset          (E : Entity_Id) return B;
   function Unknown_Component_Size                (E : Entity_Id) return B;
   function Unknown_Esize                         (E : Entity_Id) return B;
   function Unknown_Normalized_First_Bit          (E : Entity_Id) return B;
   function Unknown_Normalized_Position           (E : Entity_Id) return B;
   function Unknown_Normalized_Position_Max       (E : Entity_Id) return B;
   function Unknown_RM_Size                       (E : Entity_Id) return B;

   ------------------------------
   -- Attribute Set Procedures --
   ------------------------------

   procedure Set_Accept_Address                (Id : E; V : L);
   procedure Set_Access_Disp_Table             (Id : E; V : E);
   procedure Set_Actual_Subtype                (Id : E; V : E);
   procedure Set_Address_Taken                 (Id : E; V : B := True);
   procedure Set_Alias                         (Id : E; V : E);
   procedure Set_Alignment                     (Id : E; V : U);
   procedure Set_Associated_Final_Chain        (Id : E; V : E);
   procedure Set_Associated_Formal_Package     (Id : E; V : E);
   procedure Set_Associated_Node_For_Itype     (Id : E; V : N);
   procedure Set_Associated_Storage_Pool       (Id : E; V : E);
   procedure Set_Barrier_Function              (Id : E; V : N);
   procedure Set_Block_Node                    (Id : E; V : N);
   procedure Set_Body_Entity                   (Id : E; V : E);
   procedure Set_Body_Needed_For_SAL           (Id : E; V : B := True);
   procedure Set_CR_Discriminant               (Id : E; V : E);
   procedure Set_C_Pass_By_Copy                (Id : E; V : B := True);
   procedure Set_Can_Never_Be_Null             (Id : E; V : B := True);
   procedure Set_Checks_May_Be_Suppressed      (Id : E; V : B := True);
   procedure Set_Class_Wide_Type               (Id : E; V : E);
   procedure Set_Cloned_Subtype                (Id : E; V : E);
   procedure Set_Component_Alignment           (Id : E; V : C);
   procedure Set_Component_Bit_Offset          (Id : E; V : U);
   procedure Set_Component_Clause              (Id : E; V : N);
   procedure Set_Component_Size                (Id : E; V : U);
   procedure Set_Component_Type                (Id : E; V : E);
   procedure Set_Corresponding_Concurrent_Type (Id : E; V : E);
   procedure Set_Corresponding_Discriminant    (Id : E; V : E);
   procedure Set_Corresponding_Equality        (Id : E; V : E);
   procedure Set_Corresponding_Record_Type     (Id : E; V : E);
   procedure Set_Corresponding_Remote_Type     (Id : E; V : E);
   procedure Set_Current_Value                 (Id : E; V : N);
   procedure Set_Debug_Info_Off                (Id : E; V : B := True);
   procedure Set_Debug_Renaming_Link           (Id : E; V : E);
   procedure Set_DTC_Entity                    (Id : E; V : E);
   procedure Set_DT_Entry_Count                (Id : E; V : U);
   procedure Set_DT_Position                   (Id : E; V : U);
   procedure Set_Default_Expr_Function         (Id : E; V : E);
   procedure Set_Default_Expressions_Processed (Id : E; V : B := True);
   procedure Set_Default_Value                 (Id : E; V : N);
   procedure Set_Delay_Cleanups                (Id : E; V : B := True);
   procedure Set_Delay_Subprogram_Descriptors  (Id : E; V : B := True);
   procedure Set_Delta_Value                   (Id : E; V : R);
   procedure Set_Dependent_Instances           (Id : E; V : L);
   procedure Set_Depends_On_Private            (Id : E; V : B := True);
   procedure Set_Digits_Value                  (Id : E; V : U);
   procedure Set_Directly_Designated_Type      (Id : E; V : E);
   procedure Set_Discard_Names                 (Id : E; V : B := True);
   procedure Set_Discriminal                   (Id : E; V : E);
   procedure Set_Discriminal_Link              (Id : E; V : E);
   procedure Set_Discriminant_Checking_Func    (Id : E; V : E);
   procedure Set_Discriminant_Constraint       (Id : E; V : L);
   procedure Set_Discriminant_Default_Value    (Id : E; V : N);
   procedure Set_Discriminant_Number           (Id : E; V : U);
   procedure Set_Elaborate_All_Desirable       (Id : E; V : B := True);
   procedure Set_Elaboration_Entity            (Id : E; V : E);
   procedure Set_Elaboration_Entity_Required   (Id : E; V : B := True);
   procedure Set_Enclosing_Scope               (Id : E; V : E);
   procedure Set_Entry_Accepted                (Id : E; V : B := True);
   procedure Set_Entry_Bodies_Array            (Id : E; V : E);
   procedure Set_Entry_Cancel_Parameter        (Id : E; V : E);
   procedure Set_Entry_Component               (Id : E; V : E);
   procedure Set_Entry_Formal                  (Id : E; V : E);
   procedure Set_Entry_Index_Constant          (Id : E; V : E);
   procedure Set_Entry_Parameters_Type         (Id : E; V : E);
   procedure Set_Enum_Pos_To_Rep               (Id : E; V : E);
   procedure Set_Enumeration_Pos               (Id : E; V : U);
   procedure Set_Enumeration_Rep               (Id : E; V : U);
   procedure Set_Enumeration_Rep_Expr          (Id : E; V : N);
   procedure Set_Equivalent_Type               (Id : E; V : E);
   procedure Set_Esize                         (Id : E; V : U);
   procedure Set_Exception_Code                (Id : E; V : U);
   procedure Set_Extra_Accessibility           (Id : E; V : E);
   procedure Set_Extra_Constrained             (Id : E; V : E);
   procedure Set_Extra_Formal                  (Id : E; V : E);
   procedure Set_Finalization_Chain_Entity     (Id : E; V : E);
   procedure Set_Finalize_Storage_Only         (Id : E; V : B := True);
   procedure Set_First_Entity                  (Id : E; V : E);
   procedure Set_First_Index                   (Id : E; V : N);
   procedure Set_First_Literal                 (Id : E; V : E);
   procedure Set_First_Optional_Parameter      (Id : E; V : E);
   procedure Set_First_Private_Entity          (Id : E; V : E);
   procedure Set_First_Rep_Item                (Id : E; V : N);
   procedure Set_Freeze_Node                   (Id : E; V : N);
   procedure Set_From_With_Type                (Id : E; V : B := True);
   procedure Set_Full_View                     (Id : E; V : E);
   procedure Set_Function_Returns_With_DSP     (Id : E; V : B := True);
   procedure Set_Generic_Homonym               (Id : E; V : E);
   procedure Set_Generic_Renamings             (Id : E; V : L);
   procedure Set_Handler_Records               (Id : E; V : S);
   procedure Set_Has_Aliased_Components        (Id : E; V : B := True);
   procedure Set_Has_Alignment_Clause          (Id : E; V : B := True);
   procedure Set_Has_All_Calls_Remote          (Id : E; V : B := True);
   procedure Set_Has_Atomic_Components         (Id : E; V : B := True);
   procedure Set_Has_Biased_Representation     (Id : E; V : B := True);
   procedure Set_Has_Completion                (Id : E; V : B := True);
   procedure Set_Has_Completion_In_Body        (Id : E; V : B := True);
   procedure Set_Has_Complex_Representation    (Id : E; V : B := True);
   procedure Set_Has_Component_Size_Clause     (Id : E; V : B := True);
   procedure Set_Has_Contiguous_Rep            (Id : E; V : B := True);
   procedure Set_Has_Controlled_Component      (Id : E; V : B := True);
   procedure Set_Has_Controlling_Result        (Id : E; V : B := True);
   procedure Set_Has_Convention_Pragma         (Id : E; V : B := True);
   procedure Set_Has_Delayed_Freeze            (Id : E; V : B := True);
   procedure Set_Has_Discriminants             (Id : E; V : B := True);
   procedure Set_Has_Enumeration_Rep_Clause    (Id : E; V : B := True);
   procedure Set_Has_Exit                      (Id : E; V : B := True);
   procedure Set_Has_External_Tag_Rep_Clause   (Id : E; V : B := True);
   procedure Set_Has_Fully_Qualified_Name      (Id : E; V : B := True);
   procedure Set_Has_Gigi_Rep_Item             (Id : E; V : B := True);
   procedure Set_Has_Homonym                   (Id : E; V : B := True);
   procedure Set_Has_Machine_Radix_Clause      (Id : E; V : B := True);
   procedure Set_Has_Master_Entity             (Id : E; V : B := True);
   procedure Set_Has_Missing_Return            (Id : E; V : B := True);
   procedure Set_Has_Nested_Block_With_Handler (Id : E; V : B := True);
   procedure Set_Has_Forward_Instantiation     (Id : E; V : B := True);
   procedure Set_Has_Non_Standard_Rep          (Id : E; V : B := True);
   procedure Set_Has_Object_Size_Clause        (Id : E; V : B := True);
   procedure Set_Has_Per_Object_Constraint     (Id : E; V : B := True);
   procedure Set_Has_Pragma_Controlled         (Id : E; V : B := True);
   procedure Set_Has_Pragma_Elaborate_Body     (Id : E; V : B := True);
   procedure Set_Has_Pragma_Inline             (Id : E; V : B := True);
   procedure Set_Has_Pragma_Pack               (Id : E; V : B := True);
   procedure Set_Has_Pragma_Pure_Function      (Id : E; V : B := True);
   procedure Set_Has_Pragma_Unreferenced       (Id : E; V : B := True);
   procedure Set_Has_Primitive_Operations      (Id : E; V : B := True);
   procedure Set_Has_Private_Declaration       (Id : E; V : B := True);
   procedure Set_Has_Qualified_Name            (Id : E; V : B := True);
   procedure Set_Has_Record_Rep_Clause         (Id : E; V : B := True);
   procedure Set_Has_Recursive_Call            (Id : E; V : B := True);
   procedure Set_Has_Size_Clause               (Id : E; V : B := True);
   procedure Set_Has_Small_Clause              (Id : E; V : B := True);
   procedure Set_Has_Specified_Layout          (Id : E; V : B := True);
   procedure Set_Has_Storage_Size_Clause       (Id : E; V : B := True);
   procedure Set_Has_Stream_Size_Clause        (Id : E; V : B := True);
   procedure Set_Has_Subprogram_Descriptor     (Id : E; V : B := True);
   procedure Set_Has_Task                      (Id : E; V : B := True);
   procedure Set_Has_Unchecked_Union           (Id : E; V : B := True);
   procedure Set_Has_Unknown_Discriminants     (Id : E; V : B := True);
   procedure Set_Has_Volatile_Components       (Id : E; V : B := True);
   procedure Set_Has_Xref_Entry                (Id : E; V : B := True);
   procedure Set_Hiding_Loop_Variable          (Id : E; V : E);
   procedure Set_Homonym                       (Id : E; V : E);
   procedure Set_In_Package_Body               (Id : E; V : B := True);
   procedure Set_In_Private_Part               (Id : E; V : B := True);
   procedure Set_In_Use                        (Id : E; V : B := True);
   procedure Set_Inner_Instances               (Id : E; V : L);
   procedure Set_Interface_Name                (Id : E; V : N);
   procedure Set_Is_AST_Entry                  (Id : E; V : B := True);
   procedure Set_Is_Abstract                   (Id : E; V : B := True);
   procedure Set_Is_Access_Constant            (Id : E; V : B := True);
   procedure Set_Is_Ada_2005                   (Id : E; V : B := True);
   procedure Set_Is_Aliased                    (Id : E; V : B := True);
   procedure Set_Is_Asynchronous               (Id : E; V : B := True);
   procedure Set_Is_Atomic                     (Id : E; V : B := True);
   procedure Set_Is_Bit_Packed_Array           (Id : E; V : B := True);
   procedure Set_Is_CPP_Class                  (Id : E; V : B := True);
   procedure Set_Is_Called                     (Id : E; V : B := True);
   procedure Set_Is_Character_Type             (Id : E; V : B := True);
   procedure Set_Is_Child_Unit                 (Id : E; V : B := True);
   procedure Set_Is_Class_Wide_Equivalent_Type (Id : E; V : B := True);
   procedure Set_Is_Compilation_Unit           (Id : E; V : B := True);
   procedure Set_Is_Completely_Hidden          (Id : E; V : B := True);
   procedure Set_Is_Concurrent_Record_Type     (Id : E; V : B := True);
   procedure Set_Is_Constr_Subt_For_UN_Aliased (Id : E; V : B := True);
   procedure Set_Is_Constr_Subt_For_U_Nominal  (Id : E; V : B := True);
   procedure Set_Is_Constrained                (Id : E; V : B := True);
   procedure Set_Is_Constructor                (Id : E; V : B := True);
   procedure Set_Is_Controlled                 (Id : E; V : B := True);
   procedure Set_Is_Controlling_Formal         (Id : E; V : B := True);
   procedure Set_Is_Discrim_SO_Function        (Id : E; V : B := True);
   procedure Set_Is_Dispatching_Operation      (Id : E; V : B := True);
   procedure Set_Is_Eliminated                 (Id : E; V : B := True);
   procedure Set_Is_Entry_Formal               (Id : E; V : B := True);
   procedure Set_Is_Exported                   (Id : E; V : B := True);
   procedure Set_Is_First_Subtype              (Id : E; V : B := True);
   procedure Set_Is_For_Access_Subtype         (Id : E; V : B := True);
   procedure Set_Is_Formal_Subprogram          (Id : E; V : B := True);
   procedure Set_Is_Frozen                     (Id : E; V : B := True);
   procedure Set_Is_Generic_Actual_Type        (Id : E; V : B := True);
   procedure Set_Is_Generic_Instance           (Id : E; V : B := True);
   procedure Set_Is_Generic_Type               (Id : E; V : B := True);
   procedure Set_Is_Hidden                     (Id : E; V : B := True);
   procedure Set_Is_Hidden_Open_Scope          (Id : E; V : B := True);
   procedure Set_Is_Immediately_Visible        (Id : E; V : B := True);
   procedure Set_Is_Imported                   (Id : E; V : B := True);
   procedure Set_Is_Inlined                    (Id : E; V : B := True);
   procedure Set_Is_Instantiated               (Id : E; V : B := True);
   procedure Set_Is_Internal                   (Id : E; V : B := True);
   procedure Set_Is_Interrupt_Handler          (Id : E; V : B := True);
   procedure Set_Is_Intrinsic_Subprogram       (Id : E; V : B := True);
   procedure Set_Is_Itype                      (Id : E; V : B := True);
   procedure Set_Is_Known_Non_Null             (Id : E; V : B := True);
   procedure Set_Is_Known_Valid                (Id : E; V : B := True);
   procedure Set_Is_Limited_Composite          (Id : E; V : B := True);
   procedure Set_Is_Limited_Record             (Id : E; V : B := True);
   procedure Set_Is_Machine_Code_Subprogram    (Id : E; V : B := True);
   procedure Set_Is_Non_Static_Subtype         (Id : E; V : B := True);
   procedure Set_Is_Null_Init_Proc             (Id : E; V : B := True);
   procedure Set_Is_Obsolescent                (Id : E; V : B := True);
   procedure Set_Is_Optional_Parameter         (Id : E; V : B := True);
   procedure Set_Is_Overriding_Operation       (Id : E; V : B := True);
   procedure Set_Is_Package_Body_Entity        (Id : E; V : B := True);
   procedure Set_Is_Packed                     (Id : E; V : B := True);
   procedure Set_Is_Packed_Array_Type          (Id : E; V : B := True);
   procedure Set_Is_Potentially_Use_Visible    (Id : E; V : B := True);
   procedure Set_Is_Preelaborated              (Id : E; V : B := True);
   procedure Set_Is_Private_Composite          (Id : E; V : B := True);
   procedure Set_Is_Private_Descendant         (Id : E; V : B := True);
   procedure Set_Is_Public                     (Id : E; V : B := True);
   procedure Set_Is_Pure                       (Id : E; V : B := True);
   procedure Set_Is_Remote_Call_Interface      (Id : E; V : B := True);
   procedure Set_Is_Remote_Types               (Id : E; V : B := True);
   procedure Set_Is_Renaming_Of_Object         (Id : E; V : B := True);
   procedure Set_Is_Shared_Passive             (Id : E; V : B := True);
   procedure Set_Is_Statically_Allocated       (Id : E; V : B := True);
   procedure Set_Is_Tag                        (Id : E; V : B := True);
   procedure Set_Is_Tagged_Type                (Id : E; V : B := True);
   procedure Set_Is_Thread_Body                (Id : E; V : B := True);
   procedure Set_Is_True_Constant              (Id : E; V : B := True);
   procedure Set_Is_Unchecked_Union            (Id : E; V : B := True);
   procedure Set_Is_Unsigned_Type              (Id : E; V : B := True);
   procedure Set_Is_VMS_Exception              (Id : E; V : B := True);
   procedure Set_Is_Valued_Procedure           (Id : E; V : B := True);
   procedure Set_Is_Visible_Child_Unit         (Id : E; V : B := True);
   procedure Set_Is_Volatile                   (Id : E; V : B := True);
   procedure Set_Kill_Elaboration_Checks       (Id : E; V : B := True);
   procedure Set_Kill_Range_Checks             (Id : E; V : B := True);
   procedure Set_Kill_Tag_Checks               (Id : E; V : B := True);
   procedure Set_Last_Entity                   (Id : E; V : E);
   procedure Set_Limited_View                  (Id : E; V : E);
   procedure Set_Lit_Indexes                   (Id : E; V : E);
   procedure Set_Lit_Strings                   (Id : E; V : E);
   procedure Set_Machine_Radix_10              (Id : E; V : B := True);
   procedure Set_Master_Id                     (Id : E; V : E);
   procedure Set_Materialize_Entity            (Id : E; V : B := True);
   procedure Set_Mechanism                     (Id : E; V : M);
   procedure Set_Modulus                       (Id : E; V : U);
   procedure Set_Must_Be_On_Byte_Boundary      (Id : E; V : B := True);
   procedure Set_Needs_Debug_Info              (Id : E; V : B := True);
   procedure Set_Needs_No_Actuals              (Id : E; V : B := True);
   procedure Set_Never_Set_In_Source           (Id : E; V : B := True);
   procedure Set_Next_Inlined_Subprogram       (Id : E; V : E);
   procedure Set_No_Pool_Assigned              (Id : E; V : B := True);
   procedure Set_No_Return                     (Id : E; V : B := True);
   procedure Set_No_Strict_Aliasing            (Id : E; V : B := True);
   procedure Set_Non_Binary_Modulus            (Id : E; V : B := True);
   procedure Set_Non_Limited_View              (Id : E; V : E);
   procedure Set_Nonzero_Is_True               (Id : E; V : B := True);
   procedure Set_Normalized_First_Bit          (Id : E; V : U);
   procedure Set_Normalized_Position           (Id : E; V : U);
   procedure Set_Normalized_Position_Max       (Id : E; V : U);
   procedure Set_Object_Ref                    (Id : E; V : E);
   procedure Set_Obsolescent_Warning           (Id : E; V : N);
   procedure Set_Original_Access_Type          (Id : E; V : E);
   procedure Set_Original_Array_Type           (Id : E; V : E);
   procedure Set_Original_Record_Component     (Id : E; V : E);
   procedure Set_Packed_Array_Type             (Id : E; V : E);
   procedure Set_Parent_Subtype                (Id : E; V : E);
   procedure Set_Primitive_Operations          (Id : E; V : L);
   procedure Set_Prival                        (Id : E; V : E);
   procedure Set_Privals_Chain                 (Id : E; V : L);
   procedure Set_Private_Dependents            (Id : E; V : L);
   procedure Set_Private_View                  (Id : E; V : N);
   procedure Set_Protected_Body_Subprogram     (Id : E; V : E);
   procedure Set_Protected_Formal              (Id : E; V : E);
   procedure Set_Protected_Operation           (Id : E; V : N);
   procedure Set_RM_Size                       (Id : E; V : U);
   procedure Set_Reachable                     (Id : E; V : B := True);
   procedure Set_Referenced                    (Id : E; V : B := True);
   procedure Set_Referenced_As_LHS             (Id : E; V : B := True);
   procedure Set_Referenced_Object             (Id : E; V : N);
   procedure Set_Register_Exception_Call       (Id : E; V : N);
   procedure Set_Related_Array_Object          (Id : E; V : E);
   procedure Set_Related_Instance              (Id : E; V : E);
   procedure Set_Renamed_Entity                (Id : E; V : N);
   procedure Set_Renamed_Object                (Id : E; V : N);
   procedure Set_Renaming_Map                  (Id : E; V : U);
   procedure Set_Return_Present                (Id : E; V : B := True);
   procedure Set_Returns_By_Ref                (Id : E; V : B := True);
   procedure Set_Reverse_Bit_Order             (Id : E; V : B := True);
   procedure Set_Scalar_Range                  (Id : E; V : N);
   procedure Set_Scale_Value                   (Id : E; V : U);
   procedure Set_Scope_Depth_Value             (Id : E; V : U);
   procedure Set_Sec_Stack_Needed_For_Return   (Id : E; V : B := True);
   procedure Set_Shadow_Entities               (Id : E; V : S);
   procedure Set_Shared_Var_Assign_Proc        (Id : E; V : E);
   procedure Set_Shared_Var_Read_Proc          (Id : E; V : E);
   procedure Set_Size_Check_Code               (Id : E; V : N);
   procedure Set_Size_Depends_On_Discriminant  (Id : E; V : B := True);
   procedure Set_Size_Known_At_Compile_Time    (Id : E; V : B := True);
   procedure Set_Small_Value                   (Id : E; V : R);
   procedure Set_Spec_Entity                   (Id : E; V : E);
   procedure Set_Storage_Size_Variable         (Id : E; V : E);
   procedure Set_Stored_Constraint             (Id : E; V : L);
   procedure Set_Strict_Alignment              (Id : E; V : B := True);
   procedure Set_String_Literal_Length         (Id : E; V : U);
   procedure Set_String_Literal_Low_Bound      (Id : E; V : N);
   procedure Set_Suppress_Elaboration_Warnings (Id : E; V : B := True);
   procedure Set_Suppress_Init_Proc            (Id : E; V : B := True);
   procedure Set_Suppress_Style_Checks         (Id : E; V : B := True);
   procedure Set_Treat_As_Volatile             (Id : E; V : B := True);
   procedure Set_Underlying_Full_View          (Id : E; V : E);
   procedure Set_Unset_Reference               (Id : E; V : N);
   procedure Set_Uses_Sec_Stack                (Id : E; V : B := True);
   procedure Set_Vax_Float                     (Id : E; V : B := True);
   procedure Set_Warnings_Off                  (Id : E; V : B := True);

   -----------------------------------
   -- Field Initialization Routines --
   -----------------------------------

   --  These routines are overloadings of some of the above Set procedures
   --  where the argument is normally a Uint. The overloadings take an Int
   --  parameter instead, and appropriately convert it. There are also
   --  versions that implicitly initialize to the appropriate "not set"
   --  value. The not set (unknown) values are as follows:

   --    Alignment                 Uint_0
   --    Component_Size            Uint_0
   --    Component_Bit_Offset      No_Uint
   --    Digits_Value              Uint_0
   --    Esize                     Uint_0
   --    Normalized_First_Bit      No_Uint
   --    Normalized_Position       No_Uint
   --    Normalized_Position_Max   No_Uint
   --    RM_Size                   Uint_0

   --  It would be cleaner to use No_Uint in all these cases, but historically
   --  we chose to use Uint_0 at first, and the change over will take time ???
   --  This is particularly true for the RM_Size field, where a value of zero
   --  is legitimate and causes some kludges around the code.

   procedure Init_Alignment                (Id : E; V : Int);
   procedure Init_Component_Size           (Id : E; V : Int);
   procedure Init_Component_Bit_Offset     (Id : E; V : Int);
   procedure Init_Digits_Value             (Id : E; V : Int);
   procedure Init_Esize                    (Id : E; V : Int);
   procedure Init_Normalized_First_Bit     (Id : E; V : Int);
   procedure Init_Normalized_Position      (Id : E; V : Int);
   procedure Init_Normalized_Position_Max  (Id : E; V : Int);
   procedure Init_RM_Size                  (Id : E; V : Int);

   procedure Init_Alignment                (Id : E);
   procedure Init_Component_Size           (Id : E);
   procedure Init_Component_Bit_Offset     (Id : E);
   procedure Init_Digits_Value             (Id : E);
   procedure Init_Esize                    (Id : E);
   procedure Init_Normalized_First_Bit     (Id : E);
   procedure Init_Normalized_Position      (Id : E);
   procedure Init_Normalized_Position_Max  (Id : E);
   procedure Init_RM_Size                  (Id : E);

   procedure Init_Size_Align (Id : E);
   --  This procedure initializes both size fields and the alignment
   --  field to all be Unknown.

   procedure Init_Size (Id : E; V : Int);
   --  Initialize both the Esize and RM_Size fields of E to V

   procedure Init_Component_Location (Id : E);
   --  Initializes all fields describing the location of a component
   --  (Normalized_Position, Component_Bit_Offset, Normalized_First_Bit,
   --  Normalized_Position_Max, Esize) to all be Unknown.

   ---------------
   -- Iterators --
   ---------------

   --  The call to Next_xxx (obj) is equivalent to obj := Next_xxx (obj)
   --  We define the set of Proc_Next_xxx routines simply for the purposes
   --  of inlining them without necessarily inlining the function.

   procedure Proc_Next_Component           (N : in out Node_Id);
   procedure Proc_Next_Discriminant        (N : in out Node_Id);
   procedure Proc_Next_Formal              (N : in out Node_Id);
   procedure Proc_Next_Formal_With_Extras  (N : in out Node_Id);
   procedure Proc_Next_Index               (N : in out Node_Id);
   procedure Proc_Next_Inlined_Subprogram  (N : in out Node_Id);
   procedure Proc_Next_Literal             (N : in out Node_Id);
   procedure Proc_Next_Stored_Discriminant (N : in out Node_Id);

   pragma Inline (Proc_Next_Component);
   pragma Inline (Proc_Next_Discriminant);
   pragma Inline (Proc_Next_Formal);
   pragma Inline (Proc_Next_Formal_With_Extras);
   pragma Inline (Proc_Next_Index);
   pragma Inline (Proc_Next_Inlined_Subprogram);
   pragma Inline (Proc_Next_Literal);
   pragma Inline (Proc_Next_Stored_Discriminant);

   procedure Next_Component           (N : in out Node_Id)
     renames Proc_Next_Component;

   procedure Next_Discriminant        (N : in out Node_Id)
     renames Proc_Next_Discriminant;

   procedure Next_Formal              (N : in out Node_Id)
     renames Proc_Next_Formal;

   procedure Next_Formal_With_Extras  (N : in out Node_Id)
     renames Proc_Next_Formal_With_Extras;

   procedure Next_Index               (N : in out Node_Id)
     renames Proc_Next_Index;

   procedure Next_Inlined_Subprogram  (N : in out Node_Id)
     renames Proc_Next_Inlined_Subprogram;

   procedure Next_Literal             (N : in out Node_Id)
     renames Proc_Next_Literal;

   procedure Next_Stored_Discriminant (N : in out Node_Id)
     renames Proc_Next_Stored_Discriminant;

   ----------------------------------------------
   -- Subprograms for Accessing Rep Item Chain --
   ----------------------------------------------

   --  The First_Rep_Item field of every entity points to a linked list
   --  (linked through Next_Rep_Item) of representation pragmas and
   --  attribute definition clauses that apply to the item. Note that
   --  in the case of types, it is assumed that any such rep items for
   --  a base type also apply to all subtypes. This is implemented by
   --  having the chain for subtypes link onto the chain for the base
   --  type, so that any new entries for the subtype are added at the
   --  start of the chain.

   function Get_Attribute_Definition_Clause
     (E  : Entity_Id;
      Id : Attribute_Id) return Node_Id;
   --  Searches the Rep_Item chain for a given entity E, for an instance
   --  of an attribute definition clause with the given attibute Id Id. If
   --  found, the value returned is the N_Attribute_Definition_Clause node,
   --  otherwise Empty is returned.

   function Get_Rep_Pragma (E : Entity_Id; Nam : Name_Id) return Node_Id;
   --  Searches the Rep_Item chain for the given entity E, for an instance
   --  of a representation pragma with the given name Nam. If found then
   --  the value returned is the N_Pragma node, otherwise Empty is returned.

   function Has_Rep_Pragma (E : Entity_Id; Nam : Name_Id) return Boolean;
   --  Searches the Rep_Item chain for the given entity E, for an instance
   --  of representation pragma with the given name Nam. If found then True
   --  is returned, otherwise False indicates that no matching entry was found.

   function Has_Attribute_Definition_Clause
     (E  : Entity_Id;
      Id : Attribute_Id) return Boolean;
   --  Searches the Rep_Item chain for a given entity E, for an instance
   --  of an attribute definition clause with the given attibute Id Id. If
   --  found, True is returned, otherwise False indicates that no matching
   --  entry was found.

   procedure Record_Rep_Item (E : Entity_Id; N : Node_Id);
   --  N is the node for either a representation pragma or an attribute
   --  definition clause that applies to entity E. This procedure links
   --  the node N onto the Rep_Item chain for entity E.

   -------------------------------
   -- Miscellaneous Subprograms --
   -------------------------------

   procedure Append_Entity (Id : Entity_Id; V : Entity_Id);
   --  Add an entity to the list of entities declared in the scope V

   function Is_Entity_Name (N : Node_Id) return Boolean;
   --  Test if the node N is the name of an entity (i.e. is an identifier,
   --  expanded name, or an attribute reference that returns an entity).

   function Next_Index (Id : Node_Id) return Node_Id;
   --  Given an index from a previous call to First_Index or Next_Index,
   --  returns a node representing the occurrence of the next index subtype,
   --  or Empty if there are no more index subtypes.

   function Scope_Depth (Id : Entity_Id) return Uint;
   --  Returns the scope depth value of the Id, unless the Id is a record
   --  type, in which case it returns the scope depth of the record scope.

   function Subtype_Kind (K : Entity_Kind) return Entity_Kind;
   --  Given an entity_kind K this function returns the entity_kind
   --  corresponding to subtype kind of the type represented by K. For
   --  example if K is E_Signed_Integer_Type then E_Signed_Integer_Subtype
   --  is returned. If K is already a subtype kind it itself is returned. An
   --  internal error is generated if no such correspondence exists for K.

   ----------------------------------
   -- Debugging Output Subprograms --
   ----------------------------------

   procedure Write_Entity_Flags (Id : Entity_Id; Prefix : String);
   --  Writes a series of entries giving a line for each flag that is
   --  set to True. Each line is prefixed by the given string

   procedure Write_Entity_Info (Id : Entity_Id; Prefix : String);
   --  A debugging procedure to write out information about an entity

   procedure Write_Field6_Name  (Id : Entity_Id);
   procedure Write_Field7_Name  (Id : Entity_Id);
   procedure Write_Field8_Name  (Id : Entity_Id);
   procedure Write_Field9_Name  (Id : Entity_Id);
   procedure Write_Field10_Name (Id : Entity_Id);
   procedure Write_Field11_Name (Id : Entity_Id);
   procedure Write_Field12_Name (Id : Entity_Id);
   procedure Write_Field13_Name (Id : Entity_Id);
   procedure Write_Field14_Name (Id : Entity_Id);
   procedure Write_Field15_Name (Id : Entity_Id);
   procedure Write_Field16_Name (Id : Entity_Id);
   procedure Write_Field17_Name (Id : Entity_Id);
   procedure Write_Field18_Name (Id : Entity_Id);
   procedure Write_Field19_Name (Id : Entity_Id);
   procedure Write_Field20_Name (Id : Entity_Id);
   procedure Write_Field21_Name (Id : Entity_Id);
   procedure Write_Field22_Name (Id : Entity_Id);
   procedure Write_Field23_Name (Id : Entity_Id);
   procedure Write_Field24_Name (Id : Entity_Id);
   procedure Write_Field25_Name (Id : Entity_Id);
   procedure Write_Field26_Name (Id : Entity_Id);
   procedure Write_Field27_Name (Id : Entity_Id);
   --  These routines are used to output a nice symbolic name for the given
   --  field, depending on the Ekind. No blanks or end of lines are output,
   --  just the characters of the field name.

   --------------------
   -- Inline Pragmas --
   --------------------

   --  Note that these inline pragmas are referenced by the XEINFO utility
   --  program in preparing the corresponding C header, and only those
   --  subprograms meeting the requirements documented in the section on
   --  XEINFO may be referenced in this section.

   pragma Inline (Accept_Address);
   pragma Inline (Access_Disp_Table);
   pragma Inline (Actual_Subtype);
   pragma Inline (Address_Taken);
   pragma Inline (Alias);
   pragma Inline (Alignment);
   pragma Inline (Associated_Final_Chain);
   pragma Inline (Associated_Formal_Package);
   pragma Inline (Associated_Node_For_Itype);
   pragma Inline (Associated_Storage_Pool);
   pragma Inline (Barrier_Function);
   pragma Inline (Block_Node);
   pragma Inline (Body_Entity);
   pragma Inline (Body_Needed_For_SAL);
   pragma Inline (CR_Discriminant);
   pragma Inline (C_Pass_By_Copy);
   pragma Inline (Can_Never_Be_Null);
   pragma Inline (Checks_May_Be_Suppressed);
   pragma Inline (Class_Wide_Type);
   pragma Inline (Cloned_Subtype);
   pragma Inline (Component_Bit_Offset);
   pragma Inline (Component_Clause);
   pragma Inline (Component_Size);
   pragma Inline (Component_Type);
   pragma Inline (Corresponding_Concurrent_Type);
   pragma Inline (Corresponding_Discriminant);
   pragma Inline (Corresponding_Equality);
   pragma Inline (Corresponding_Record_Type);
   pragma Inline (Corresponding_Remote_Type);
   pragma Inline (Current_Value);
   pragma Inline (Debug_Info_Off);
   pragma Inline (Debug_Renaming_Link);
   pragma Inline (DTC_Entity);
   pragma Inline (DT_Entry_Count);
   pragma Inline (DT_Position);
   pragma Inline (Default_Expr_Function);
   pragma Inline (Default_Expressions_Processed);
   pragma Inline (Default_Value);
   pragma Inline (Delay_Cleanups);
   pragma Inline (Delay_Subprogram_Descriptors);
   pragma Inline (Delta_Value);
   pragma Inline (Dependent_Instances);
   pragma Inline (Depends_On_Private);
   pragma Inline (Digits_Value);
   pragma Inline (Directly_Designated_Type);
   pragma Inline (Discard_Names);
   pragma Inline (Discriminal);
   pragma Inline (Discriminal_Link);
   pragma Inline (Discriminant_Checking_Func);
   pragma Inline (Discriminant_Constraint);
   pragma Inline (Discriminant_Default_Value);
   pragma Inline (Discriminant_Number);
   pragma Inline (Elaborate_All_Desirable);
   pragma Inline (Elaboration_Entity);
   pragma Inline (Elaboration_Entity_Required);
   pragma Inline (Enclosing_Scope);
   pragma Inline (Entry_Accepted);
   pragma Inline (Entry_Bodies_Array);
   pragma Inline (Entry_Cancel_Parameter);
   pragma Inline (Entry_Component);
   pragma Inline (Entry_Formal);
   pragma Inline (Entry_Index_Constant);
   pragma Inline (Entry_Index_Type);
   pragma Inline (Entry_Parameters_Type);
   pragma Inline (Enum_Pos_To_Rep);
   pragma Inline (Enumeration_Pos);
   pragma Inline (Enumeration_Rep);
   pragma Inline (Enumeration_Rep_Expr);
   pragma Inline (Equivalent_Type);
   pragma Inline (Esize);
   pragma Inline (Exception_Code);
   pragma Inline (Extra_Accessibility);
   pragma Inline (Extra_Constrained);
   pragma Inline (Extra_Formal);
   pragma Inline (Finalization_Chain_Entity);
   pragma Inline (First_Entity);
   pragma Inline (First_Index);
   pragma Inline (First_Literal);
   pragma Inline (First_Optional_Parameter);
   pragma Inline (First_Private_Entity);
   pragma Inline (First_Rep_Item);
   pragma Inline (Freeze_Node);
   pragma Inline (From_With_Type);
   pragma Inline (Full_View);
   pragma Inline (Function_Returns_With_DSP);
   pragma Inline (Generic_Homonym);
   pragma Inline (Generic_Renamings);
   pragma Inline (Handler_Records);
   pragma Inline (Has_Aliased_Components);
   pragma Inline (Has_Alignment_Clause);
   pragma Inline (Has_All_Calls_Remote);
   pragma Inline (Has_Atomic_Components);
   pragma Inline (Has_Biased_Representation);
   pragma Inline (Has_Completion);
   pragma Inline (Has_Completion_In_Body);
   pragma Inline (Has_Complex_Representation);
   pragma Inline (Has_Component_Size_Clause);
   pragma Inline (Has_Contiguous_Rep);
   pragma Inline (Has_Controlled_Component);
   pragma Inline (Has_Controlling_Result);
   pragma Inline (Has_Convention_Pragma);
   pragma Inline (Has_Delayed_Freeze);
   pragma Inline (Has_Discriminants);
   pragma Inline (Has_Enumeration_Rep_Clause);
   pragma Inline (Has_Exit);
   pragma Inline (Has_External_Tag_Rep_Clause);
   pragma Inline (Has_Fully_Qualified_Name);
   pragma Inline (Has_Gigi_Rep_Item);
   pragma Inline (Has_Homonym);
   pragma Inline (Has_Machine_Radix_Clause);
   pragma Inline (Has_Master_Entity);
   pragma Inline (Has_Missing_Return);
   pragma Inline (Has_Nested_Block_With_Handler);
   pragma Inline (Has_Forward_Instantiation);
   pragma Inline (Has_Non_Standard_Rep);
   pragma Inline (Has_Object_Size_Clause);
   pragma Inline (Has_Per_Object_Constraint);
   pragma Inline (Has_Pragma_Controlled);
   pragma Inline (Has_Pragma_Elaborate_Body);
   pragma Inline (Has_Pragma_Inline);
   pragma Inline (Has_Pragma_Pack);
   pragma Inline (Has_Pragma_Pure_Function);
   pragma Inline (Has_Pragma_Unreferenced);
   pragma Inline (Has_Primitive_Operations);
   pragma Inline (Has_Private_Declaration);
   pragma Inline (Has_Qualified_Name);
   pragma Inline (Has_Record_Rep_Clause);
   pragma Inline (Has_Recursive_Call);
   pragma Inline (Has_Size_Clause);
   pragma Inline (Has_Small_Clause);
   pragma Inline (Has_Specified_Layout);
   pragma Inline (Has_Storage_Size_Clause);
   pragma Inline (Has_Stream_Size_Clause);
   pragma Inline (Has_Subprogram_Descriptor);
   pragma Inline (Has_Task);
   pragma Inline (Has_Unchecked_Union);
   pragma Inline (Has_Unknown_Discriminants);
   pragma Inline (Has_Volatile_Components);
   pragma Inline (Has_Xref_Entry);
   pragma Inline (Hiding_Loop_Variable);
   pragma Inline (Homonym);
   pragma Inline (In_Package_Body);
   pragma Inline (In_Private_Part);
   pragma Inline (In_Use);
   pragma Inline (Inner_Instances);
   pragma Inline (Interface_Name);
   pragma Inline (Is_AST_Entry);
   pragma Inline (Is_Abstract);
   pragma Inline (Is_Access_Constant);
   pragma Inline (Is_Ada_2005);
   pragma Inline (Is_Access_Type);
   pragma Inline (Is_Aliased);
   pragma Inline (Is_Array_Type);
   pragma Inline (Is_Asynchronous);
   pragma Inline (Is_Atomic);
   pragma Inline (Is_Bit_Packed_Array);
   pragma Inline (Is_CPP_Class);
   pragma Inline (Is_Called);
   pragma Inline (Is_Character_Type);
   pragma Inline (Is_Child_Unit);
   pragma Inline (Is_Class_Wide_Equivalent_Type);
   pragma Inline (Is_Class_Wide_Type);
   pragma Inline (Is_Compilation_Unit);
   pragma Inline (Is_Completely_Hidden);
   pragma Inline (Is_Composite_Type);
   pragma Inline (Is_Concurrent_Body);
   pragma Inline (Is_Concurrent_Record_Type);
   pragma Inline (Is_Concurrent_Type);
   pragma Inline (Is_Constr_Subt_For_UN_Aliased);
   pragma Inline (Is_Constr_Subt_For_U_Nominal);
   pragma Inline (Is_Constrained);
   pragma Inline (Is_Constructor);
   pragma Inline (Is_Controlled);
   pragma Inline (Is_Controlling_Formal);
   pragma Inline (Is_Decimal_Fixed_Point_Type);
   pragma Inline (Is_Discrim_SO_Function);
   pragma Inline (Is_Digits_Type);
   pragma Inline (Is_Discrete_Or_Fixed_Point_Type);
   pragma Inline (Is_Discrete_Type);
   pragma Inline (Is_Dispatching_Operation);
   pragma Inline (Is_Elementary_Type);
   pragma Inline (Is_Eliminated);
   pragma Inline (Is_Entry);
   pragma Inline (Is_Entry_Formal);
   pragma Inline (Is_Enumeration_Type);
   pragma Inline (Is_Exported);
   pragma Inline (Is_First_Subtype);
   pragma Inline (Is_Fixed_Point_Type);
   pragma Inline (Is_Floating_Point_Type);
   pragma Inline (Is_For_Access_Subtype);
   pragma Inline (Is_Formal);
   pragma Inline (Is_Formal_Subprogram);
   pragma Inline (Is_Frozen);
   pragma Inline (Is_Generic_Actual_Type);
   pragma Inline (Is_Generic_Instance);
   pragma Inline (Is_Generic_Subprogram);
   pragma Inline (Is_Generic_Type);
   pragma Inline (Is_Generic_Unit);
   pragma Inline (Is_Hidden);
   pragma Inline (Is_Hidden_Open_Scope);
   pragma Inline (Is_Immediately_Visible);
   pragma Inline (Is_Imported);
   pragma Inline (Is_Incomplete_Or_Private_Type);
   pragma Inline (Is_Inlined);
   pragma Inline (Is_Instantiated);
   pragma Inline (Is_Integer_Type);
   pragma Inline (Is_Internal);
   pragma Inline (Is_Interrupt_Handler);
   pragma Inline (Is_Intrinsic_Subprogram);
   pragma Inline (Is_Itype);
   pragma Inline (Is_Known_Non_Null);
   pragma Inline (Is_Known_Valid);
   pragma Inline (Is_Limited_Composite);
   pragma Inline (Is_Limited_Record);
   pragma Inline (Is_Machine_Code_Subprogram);
   pragma Inline (Is_Modular_Integer_Type);
   pragma Inline (Is_Named_Number);
   pragma Inline (Is_Non_Static_Subtype);
   pragma Inline (Is_Null_Init_Proc);
   pragma Inline (Is_Obsolescent);
   pragma Inline (Is_Numeric_Type);
   pragma Inline (Is_Object);
   pragma Inline (Is_Optional_Parameter);
   pragma Inline (Is_Package_Body_Entity);
   pragma Inline (Is_Ordinary_Fixed_Point_Type);
   pragma Inline (Is_Overloadable);
   pragma Inline (Is_Overriding_Operation);
   pragma Inline (Is_Packed);
   pragma Inline (Is_Packed_Array_Type);
   pragma Inline (Is_Potentially_Use_Visible);
   pragma Inline (Is_Preelaborated);
   pragma Inline (Is_Private_Composite);
   pragma Inline (Is_Private_Descendant);
   pragma Inline (Is_Private_Type);
   pragma Inline (Is_Protected_Type);
   pragma Inline (Is_Public);
   pragma Inline (Is_Pure);
   pragma Inline (Is_Real_Type);
   pragma Inline (Is_Record_Type);
   pragma Inline (Is_Remote_Call_Interface);
   pragma Inline (Is_Remote_Types);
   pragma Inline (Is_Renaming_Of_Object);
   pragma Inline (Is_Scalar_Type);
   pragma Inline (Is_Shared_Passive);
   pragma Inline (Is_Signed_Integer_Type);
   pragma Inline (Is_Statically_Allocated);
   pragma Inline (Is_Subprogram);
   pragma Inline (Is_Tag);
   pragma Inline (Is_Tagged_Type);
   pragma Inline (Is_Thread_Body);
   pragma Inline (Is_True_Constant);
   pragma Inline (Is_Task_Type);
   pragma Inline (Is_Type);
   pragma Inline (Is_Unchecked_Union);
   pragma Inline (Is_Unsigned_Type);
   pragma Inline (Is_VMS_Exception);
   pragma Inline (Is_Valued_Procedure);
   pragma Inline (Is_Visible_Child_Unit);
   pragma Inline (Kill_Elaboration_Checks);
   pragma Inline (Kill_Range_Checks);
   pragma Inline (Kill_Tag_Checks);
   pragma Inline (Last_Entity);
   pragma Inline (Limited_View);
   pragma Inline (Lit_Indexes);
   pragma Inline (Lit_Strings);
   pragma Inline (Machine_Radix_10);
   pragma Inline (Master_Id);
   pragma Inline (Materialize_Entity);
   pragma Inline (Mechanism);
   pragma Inline (Modulus);
   pragma Inline (Must_Be_On_Byte_Boundary);
   pragma Inline (Needs_Debug_Info);
   pragma Inline (Needs_No_Actuals);
   pragma Inline (Never_Set_In_Source);
   pragma Inline (Next_Index);
   pragma Inline (Next_Inlined_Subprogram);
   pragma Inline (Next_Literal);
   pragma Inline (No_Pool_Assigned);
   pragma Inline (No_Return);
   pragma Inline (No_Strict_Aliasing);
   pragma Inline (Non_Binary_Modulus);
   pragma Inline (Non_Limited_View);
   pragma Inline (Nonzero_Is_True);
   pragma Inline (Normalized_First_Bit);
   pragma Inline (Normalized_Position);
   pragma Inline (Normalized_Position_Max);
   pragma Inline (Object_Ref);
   pragma Inline (Obsolescent_Warning);
   pragma Inline (Original_Access_Type);
   pragma Inline (Original_Array_Type);
   pragma Inline (Original_Record_Component);
   pragma Inline (Packed_Array_Type);
   pragma Inline (Parameter_Mode);
   pragma Inline (Parent_Subtype);
   pragma Inline (Primitive_Operations);
   pragma Inline (Prival);
   pragma Inline (Privals_Chain);
   pragma Inline (Private_Dependents);
   pragma Inline (Private_View);
   pragma Inline (Protected_Body_Subprogram);
   pragma Inline (Protected_Formal);
   pragma Inline (Protected_Operation);
   pragma Inline (RM_Size);
   pragma Inline (Reachable);
   pragma Inline (Referenced);
   pragma Inline (Referenced_As_LHS);
   pragma Inline (Referenced_Object);
   pragma Inline (Register_Exception_Call);
   pragma Inline (Related_Array_Object);
   pragma Inline (Related_Instance);
   pragma Inline (Renamed_Entity);
   pragma Inline (Renamed_Object);
   pragma Inline (Renaming_Map);
   pragma Inline (Return_Present);
   pragma Inline (Returns_By_Ref);
   pragma Inline (Reverse_Bit_Order);
   pragma Inline (Scalar_Range);
   pragma Inline (Scale_Value);
   pragma Inline (Scope_Depth_Value);
   pragma Inline (Sec_Stack_Needed_For_Return);
   pragma Inline (Shadow_Entities);
   pragma Inline (Shared_Var_Assign_Proc);
   pragma Inline (Shared_Var_Read_Proc);
   pragma Inline (Size_Check_Code);
   pragma Inline (Size_Depends_On_Discriminant);
   pragma Inline (Size_Known_At_Compile_Time);
   pragma Inline (Small_Value);
   pragma Inline (Spec_Entity);
   pragma Inline (Storage_Size_Variable);
   pragma Inline (Stored_Constraint);
   pragma Inline (Strict_Alignment);
   pragma Inline (String_Literal_Length);
   pragma Inline (String_Literal_Low_Bound);
   pragma Inline (Suppress_Elaboration_Warnings);
   pragma Inline (Suppress_Init_Proc);
   pragma Inline (Suppress_Style_Checks);
   pragma Inline (Treat_As_Volatile);
   pragma Inline (Underlying_Full_View);
   pragma Inline (Unset_Reference);
   pragma Inline (Uses_Sec_Stack);
   pragma Inline (Vax_Float);
   pragma Inline (Warnings_Off);

   pragma Inline (Init_Alignment);
   pragma Inline (Init_Component_Bit_Offset);
   pragma Inline (Init_Component_Size);
   pragma Inline (Init_Digits_Value);
   pragma Inline (Init_Esize);
   pragma Inline (Init_RM_Size);

   pragma Inline (Set_Accept_Address);
   pragma Inline (Set_Access_Disp_Table);
   pragma Inline (Set_Actual_Subtype);
   pragma Inline (Set_Address_Taken);
   pragma Inline (Set_Alias);
   pragma Inline (Set_Alignment);
   pragma Inline (Set_Associated_Final_Chain);
   pragma Inline (Set_Associated_Formal_Package);
   pragma Inline (Set_Associated_Node_For_Itype);
   pragma Inline (Set_Associated_Storage_Pool);
   pragma Inline (Set_Barrier_Function);
   pragma Inline (Set_Block_Node);
   pragma Inline (Set_Body_Entity);
   pragma Inline (Set_Body_Needed_For_SAL);
   pragma Inline (Set_CR_Discriminant);
   pragma Inline (Set_C_Pass_By_Copy);
   pragma Inline (Set_Can_Never_Be_Null);
   pragma Inline (Set_Checks_May_Be_Suppressed);
   pragma Inline (Set_Class_Wide_Type);
   pragma Inline (Set_Cloned_Subtype);
   pragma Inline (Set_Component_Bit_Offset);
   pragma Inline (Set_Component_Clause);
   pragma Inline (Set_Component_Size);
   pragma Inline (Set_Component_Type);
   pragma Inline (Set_Corresponding_Concurrent_Type);
   pragma Inline (Set_Corresponding_Discriminant);
   pragma Inline (Set_Corresponding_Equality);
   pragma Inline (Set_Corresponding_Record_Type);
   pragma Inline (Set_Corresponding_Remote_Type);
   pragma Inline (Set_Current_Value);
   pragma Inline (Set_Debug_Info_Off);
   pragma Inline (Set_Debug_Renaming_Link);
   pragma Inline (Set_DTC_Entity);
   pragma Inline (Set_DT_Position);
   pragma Inline (Set_Default_Expr_Function);
   pragma Inline (Set_Default_Expressions_Processed);
   pragma Inline (Set_Default_Value);
   pragma Inline (Set_Delay_Cleanups);
   pragma Inline (Set_Delay_Subprogram_Descriptors);
   pragma Inline (Set_Delta_Value);
   pragma Inline (Set_Dependent_Instances);
   pragma Inline (Set_Depends_On_Private);
   pragma Inline (Set_Digits_Value);
   pragma Inline (Set_Directly_Designated_Type);
   pragma Inline (Set_Discard_Names);
   pragma Inline (Set_Discriminal);
   pragma Inline (Set_Discriminal_Link);
   pragma Inline (Set_Discriminant_Checking_Func);
   pragma Inline (Set_Discriminant_Constraint);
   pragma Inline (Set_Discriminant_Default_Value);
   pragma Inline (Set_Discriminant_Number);
   pragma Inline (Set_Elaborate_All_Desirable);
   pragma Inline (Set_Elaboration_Entity);
   pragma Inline (Set_Elaboration_Entity_Required);
   pragma Inline (Set_Enclosing_Scope);
   pragma Inline (Set_Entry_Accepted);
   pragma Inline (Set_Entry_Bodies_Array);
   pragma Inline (Set_Entry_Cancel_Parameter);
   pragma Inline (Set_Entry_Component);
   pragma Inline (Set_Entry_Formal);
   pragma Inline (Set_Entry_Parameters_Type);
   pragma Inline (Set_Enum_Pos_To_Rep);
   pragma Inline (Set_Enumeration_Pos);
   pragma Inline (Set_Enumeration_Rep);
   pragma Inline (Set_Enumeration_Rep_Expr);
   pragma Inline (Set_Equivalent_Type);
   pragma Inline (Set_Esize);
   pragma Inline (Set_Exception_Code);
   pragma Inline (Set_Extra_Accessibility);
   pragma Inline (Set_Extra_Constrained);
   pragma Inline (Set_Extra_Formal);
   pragma Inline (Set_Finalization_Chain_Entity);
   pragma Inline (Set_First_Entity);
   pragma Inline (Set_First_Index);
   pragma Inline (Set_First_Literal);
   pragma Inline (Set_First_Optional_Parameter);
   pragma Inline (Set_First_Private_Entity);
   pragma Inline (Set_First_Rep_Item);
   pragma Inline (Set_Freeze_Node);
   pragma Inline (Set_From_With_Type);
   pragma Inline (Set_Full_View);
   pragma Inline (Set_Function_Returns_With_DSP);
   pragma Inline (Set_Generic_Homonym);
   pragma Inline (Set_Generic_Renamings);
   pragma Inline (Set_Handler_Records);
   pragma Inline (Set_Has_Aliased_Components);
   pragma Inline (Set_Has_Alignment_Clause);
   pragma Inline (Set_Has_All_Calls_Remote);
   pragma Inline (Set_Has_Atomic_Components);
   pragma Inline (Set_Has_Biased_Representation);
   pragma Inline (Set_Has_Completion);
   pragma Inline (Set_Has_Completion_In_Body);
   pragma Inline (Set_Has_Complex_Representation);
   pragma Inline (Set_Has_Component_Size_Clause);
   pragma Inline (Set_Has_Contiguous_Rep);
   pragma Inline (Set_Has_Controlled_Component);
   pragma Inline (Set_Has_Controlling_Result);
   pragma Inline (Set_Has_Convention_Pragma);
   pragma Inline (Set_Has_Delayed_Freeze);
   pragma Inline (Set_Has_Discriminants);
   pragma Inline (Set_Has_Enumeration_Rep_Clause);
   pragma Inline (Set_Has_Exit);
   pragma Inline (Set_Has_External_Tag_Rep_Clause);
   pragma Inline (Set_Has_Fully_Qualified_Name);
   pragma Inline (Set_Has_Gigi_Rep_Item);
   pragma Inline (Set_Has_Homonym);
   pragma Inline (Set_Has_Machine_Radix_Clause);
   pragma Inline (Set_Has_Master_Entity);
   pragma Inline (Set_Has_Missing_Return);
   pragma Inline (Set_Has_Nested_Block_With_Handler);
   pragma Inline (Set_Has_Forward_Instantiation);
   pragma Inline (Set_Has_Non_Standard_Rep);
   pragma Inline (Set_Has_Object_Size_Clause);
   pragma Inline (Set_Has_Per_Object_Constraint);
   pragma Inline (Set_Has_Pragma_Controlled);
   pragma Inline (Set_Has_Pragma_Elaborate_Body);
   pragma Inline (Set_Has_Pragma_Inline);
   pragma Inline (Set_Has_Pragma_Pack);
   pragma Inline (Set_Has_Pragma_Pure_Function);
   pragma Inline (Set_Has_Pragma_Unreferenced);
   pragma Inline (Set_Has_Primitive_Operations);
   pragma Inline (Set_Has_Private_Declaration);
   pragma Inline (Set_Has_Qualified_Name);
   pragma Inline (Set_Has_Record_Rep_Clause);
   pragma Inline (Set_Has_Recursive_Call);
   pragma Inline (Set_Has_Size_Clause);
   pragma Inline (Set_Has_Small_Clause);
   pragma Inline (Set_Has_Specified_Layout);
   pragma Inline (Set_Has_Storage_Size_Clause);
   pragma Inline (Set_Has_Subprogram_Descriptor);
   pragma Inline (Set_Has_Task);
   pragma Inline (Set_Has_Unchecked_Union);
   pragma Inline (Set_Has_Unknown_Discriminants);
   pragma Inline (Set_Has_Volatile_Components);
   pragma Inline (Set_Has_Xref_Entry);
   pragma Inline (Set_Hiding_Loop_Variable);
   pragma Inline (Set_Homonym);
   pragma Inline (Set_In_Package_Body);
   pragma Inline (Set_In_Private_Part);
   pragma Inline (Set_In_Use);
   pragma Inline (Set_Inner_Instances);
   pragma Inline (Set_Interface_Name);
   pragma Inline (Set_Is_AST_Entry);
   pragma Inline (Set_Is_Abstract);
   pragma Inline (Set_Is_Access_Constant);
   pragma Inline (Set_Is_Ada_2005);
   pragma Inline (Set_Is_Aliased);
   pragma Inline (Set_Is_Asynchronous);
   pragma Inline (Set_Is_Atomic);
   pragma Inline (Set_Is_Bit_Packed_Array);
   pragma Inline (Set_Is_CPP_Class);
   pragma Inline (Set_Is_Called);
   pragma Inline (Set_Is_Character_Type);
   pragma Inline (Set_Is_Child_Unit);
   pragma Inline (Set_Is_Class_Wide_Equivalent_Type);
   pragma Inline (Set_Is_Compilation_Unit);
   pragma Inline (Set_Is_Completely_Hidden);
   pragma Inline (Set_Is_Concurrent_Record_Type);
   pragma Inline (Set_Is_Constr_Subt_For_U_Nominal);
   pragma Inline (Set_Is_Constr_Subt_For_UN_Aliased);
   pragma Inline (Set_Is_Constrained);
   pragma Inline (Set_Is_Constructor);
   pragma Inline (Set_Is_Controlled);
   pragma Inline (Set_Is_Controlling_Formal);
   pragma Inline (Set_Is_Discrim_SO_Function);
   pragma Inline (Set_Is_Dispatching_Operation);
   pragma Inline (Set_Is_Eliminated);
   pragma Inline (Set_Is_Entry_Formal);
   pragma Inline (Set_Is_Exported);
   pragma Inline (Set_Is_First_Subtype);
   pragma Inline (Set_Is_For_Access_Subtype);
   pragma Inline (Set_Is_Formal_Subprogram);
   pragma Inline (Set_Is_Frozen);
   pragma Inline (Set_Is_Generic_Actual_Type);
   pragma Inline (Set_Is_Generic_Instance);
   pragma Inline (Set_Is_Generic_Type);
   pragma Inline (Set_Is_Hidden);
   pragma Inline (Set_Is_Hidden_Open_Scope);
   pragma Inline (Set_Is_Immediately_Visible);
   pragma Inline (Set_Is_Imported);
   pragma Inline (Set_Is_Inlined);
   pragma Inline (Set_Is_Instantiated);
   pragma Inline (Set_Is_Internal);
   pragma Inline (Set_Is_Interrupt_Handler);
   pragma Inline (Set_Is_Intrinsic_Subprogram);
   pragma Inline (Set_Is_Itype);
   pragma Inline (Set_Is_Known_Non_Null);
   pragma Inline (Set_Is_Known_Valid);
   pragma Inline (Set_Is_Limited_Composite);
   pragma Inline (Set_Is_Limited_Record);
   pragma Inline (Set_Is_Machine_Code_Subprogram);
   pragma Inline (Set_Is_Non_Static_Subtype);
   pragma Inline (Set_Is_Null_Init_Proc);
   pragma Inline (Set_Is_Obsolescent);
   pragma Inline (Set_Is_Optional_Parameter);
   pragma Inline (Set_Is_Overriding_Operation);
   pragma Inline (Set_Is_Package_Body_Entity);
   pragma Inline (Set_Is_Packed);
   pragma Inline (Set_Is_Packed_Array_Type);
   pragma Inline (Set_Is_Potentially_Use_Visible);
   pragma Inline (Set_Is_Preelaborated);
   pragma Inline (Set_Is_Private_Composite);
   pragma Inline (Set_Is_Private_Descendant);
   pragma Inline (Set_Is_Public);
   pragma Inline (Set_Is_Pure);
   pragma Inline (Set_Is_Remote_Call_Interface);
   pragma Inline (Set_Is_Remote_Types);
   pragma Inline (Set_Is_Renaming_Of_Object);
   pragma Inline (Set_Is_Shared_Passive);
   pragma Inline (Set_Is_Statically_Allocated);
   pragma Inline (Set_Is_Tag);
   pragma Inline (Set_Is_Tagged_Type);
   pragma Inline (Set_Is_Thread_Body);
   pragma Inline (Set_Is_True_Constant);
   pragma Inline (Set_Is_Unchecked_Union);
   pragma Inline (Set_Is_Unsigned_Type);
   pragma Inline (Set_Is_VMS_Exception);
   pragma Inline (Set_Is_Valued_Procedure);
   pragma Inline (Set_Is_Visible_Child_Unit);
   pragma Inline (Set_Is_Volatile);
   pragma Inline (Set_Kill_Elaboration_Checks);
   pragma Inline (Set_Kill_Range_Checks);
   pragma Inline (Set_Kill_Tag_Checks);
   pragma Inline (Set_Last_Entity);
   pragma Inline (Set_Limited_View);
   pragma Inline (Set_Lit_Indexes);
   pragma Inline (Set_Lit_Strings);
   pragma Inline (Set_Machine_Radix_10);
   pragma Inline (Set_Master_Id);
   pragma Inline (Set_Materialize_Entity);
   pragma Inline (Set_Mechanism);
   pragma Inline (Set_Modulus);
   pragma Inline (Set_Must_Be_On_Byte_Boundary);
   pragma Inline (Set_Needs_Debug_Info);
   pragma Inline (Set_Needs_No_Actuals);
   pragma Inline (Set_Never_Set_In_Source);
   pragma Inline (Set_Next_Inlined_Subprogram);
   pragma Inline (Set_No_Pool_Assigned);
   pragma Inline (Set_No_Return);
   pragma Inline (Set_No_Strict_Aliasing);
   pragma Inline (Set_Non_Binary_Modulus);
   pragma Inline (Set_Non_Limited_View);
   pragma Inline (Set_Nonzero_Is_True);
   pragma Inline (Set_Normalized_First_Bit);
   pragma Inline (Set_Normalized_Position);
   pragma Inline (Set_Normalized_Position_Max);
   pragma Inline (Set_Object_Ref);
   pragma Inline (Set_Obsolescent_Warning);
   pragma Inline (Set_Original_Access_Type);
   pragma Inline (Set_Original_Array_Type);
   pragma Inline (Set_Original_Record_Component);
   pragma Inline (Set_Packed_Array_Type);
   pragma Inline (Set_Parent_Subtype);
   pragma Inline (Set_Primitive_Operations);
   pragma Inline (Set_Prival);
   pragma Inline (Set_Privals_Chain);
   pragma Inline (Set_Private_Dependents);
   pragma Inline (Set_Private_View);
   pragma Inline (Set_Protected_Body_Subprogram);
   pragma Inline (Set_Protected_Formal);
   pragma Inline (Set_Protected_Operation);
   pragma Inline (Set_RM_Size);
   pragma Inline (Set_Reachable);
   pragma Inline (Set_Referenced);
   pragma Inline (Set_Referenced_As_LHS);
   pragma Inline (Set_Referenced_Object);
   pragma Inline (Set_Register_Exception_Call);
   pragma Inline (Set_Related_Array_Object);
   pragma Inline (Set_Related_Instance);
   pragma Inline (Set_Renamed_Entity);
   pragma Inline (Set_Renamed_Object);
   pragma Inline (Set_Renaming_Map);
   pragma Inline (Set_Return_Present);
   pragma Inline (Set_Returns_By_Ref);
   pragma Inline (Set_Reverse_Bit_Order);
   pragma Inline (Set_Scalar_Range);
   pragma Inline (Set_Scale_Value);
   pragma Inline (Set_Scope_Depth_Value);
   pragma Inline (Set_Sec_Stack_Needed_For_Return);
   pragma Inline (Set_Shadow_Entities);
   pragma Inline (Set_Shared_Var_Assign_Proc);
   pragma Inline (Set_Shared_Var_Read_Proc);
   pragma Inline (Set_Size_Check_Code);
   pragma Inline (Set_Size_Depends_On_Discriminant);
   pragma Inline (Set_Size_Known_At_Compile_Time);
   pragma Inline (Set_Small_Value);
   pragma Inline (Set_Spec_Entity);
   pragma Inline (Set_Storage_Size_Variable);
   pragma Inline (Set_Stored_Constraint);
   pragma Inline (Set_Strict_Alignment);
   pragma Inline (Set_String_Literal_Length);
   pragma Inline (Set_String_Literal_Low_Bound);
   pragma Inline (Set_Suppress_Elaboration_Warnings);
   pragma Inline (Set_Suppress_Init_Proc);
   pragma Inline (Set_Suppress_Style_Checks);
   pragma Inline (Set_Treat_As_Volatile);
   pragma Inline (Set_Underlying_Full_View);
   pragma Inline (Set_Unset_Reference);
   pragma Inline (Set_Uses_Sec_Stack);
   pragma Inline (Set_Vax_Float);
   pragma Inline (Set_Warnings_Off);

   --  END XEINFO INLINES

   --  The following Inline pragmas are *not* read by xeinfo when building
   --  the C version of this interface automatically (so the C version will
   --  end up making out of line calls). The pragma scan in xeinfo will be
   --  terminated on encountering the END XEINFO INLINES line. We inline
   --  things here which are small, but not of the canonical attribute
   --  access/set format that can be handled by xeinfo.

   pragma Inline (Is_Package);
   pragma Inline (Is_Wrapper_Package);
   pragma Inline (Known_RM_Size);
   pragma Inline (Known_Static_Component_Bit_Offset);
   pragma Inline (Known_Static_RM_Size);
   pragma Inline (Scope_Depth);
   pragma Inline (Scope_Depth_Set);
   pragma Inline (Unknown_RM_Size);

end Einfo;