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1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- F R E E Z E --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1992-2012, Free Software Foundation, Inc. --
10 -- --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
20 -- --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
23 -- --
24 ------------------------------------------------------------------------------
71 -----------------------
72 -- Local Subprograms --
73 -----------------------
76 -- Typ is a type that is being frozen. If no size clause is given,
77 -- but a default Esize has been computed, then this default Esize is
78 -- adjusted up if necessary to be consistent with a given alignment,
79 -- but never to a value greater than Long_Long_Integer'Size. This
80 -- is used for all discrete types and for fixed-point types.
82 procedure Build_And_Analyze_Renamed_Body
86 -- Build body for a renaming declaration, insert in tree and analyze
89 -- Apply legality checks to address clauses for object declarations,
90 -- at the point the object is frozen.
92 procedure Check_Component_Storage_Order
95 -- For an Encl_Type that has a Scalar_Storage_Order attribute definition
96 -- clause, verify that the component type is compatible. For arrays,
97 -- Comp is Empty; for records, it is the entity of the component under
98 -- consideration.
101 -- E is a base type. If E is tagged or has a component that is aliased
102 -- or tagged or contains something this is aliased or tagged, set
103 -- Strict_Alignment.
107 -- If E is a fixed-point or discrete type, then all the necessary work
108 -- to freeze it is completed except for possible setting of the flag
109 -- Is_Unsigned_Type, which is done by this procedure. The call has no
110 -- effect if the entity E is not a discrete or fixed-point type.
112 procedure Freeze_And_Append
116 -- Freezes Ent using Freeze_Entity, and appends the resulting list of
117 -- nodes to Result, modifying Result from No_List if necessary. N has
118 -- the same usage as in Freeze_Entity.
121 -- Freeze enumeration type. The Esize field is set as processing
122 -- proceeds (i.e. set by default when the type is declared and then
123 -- adjusted by rep clauses. What this procedure does is to make sure
124 -- that if a foreign convention is specified, and no specific size
125 -- is given, then the size must be at least Integer'Size.
128 -- If an object is frozen which has Is_Statically_Allocated set, then
129 -- all referenced types must also be marked with this flag. This routine
130 -- is in charge of meeting this requirement for the object entity E.
133 -- Perform freezing actions for a subprogram (create extra formals,
134 -- and set proper default mechanism values). Note that this routine
135 -- is not called for internal subprograms, for which neither of these
136 -- actions is needed (or desirable, we do not want for example to have
137 -- these extra formals present in initialization procedures, where they
138 -- would serve no purpose). In this call E is either a subprogram or
139 -- a subprogram type (i.e. an access to a subprogram).
142 -- True if T is not private and has no private components, or has a full
143 -- view. Used to determine whether the designated type of an access type
144 -- should be frozen when the access type is frozen. This is done when an
145 -- allocator is frozen, or an expression that may involve attributes of
146 -- the designated type. Otherwise freezing the access type does not freeze
147 -- the designated type.
149 procedure Process_Default_Expressions
152 -- This procedure is called for each subprogram to complete processing of
153 -- default expressions at the point where all types are known to be frozen.
154 -- The expressions must be analyzed in full, to make sure that all error
155 -- processing is done (they have only been pre-analyzed). If the expression
156 -- is not an entity or literal, its analysis may generate code which must
157 -- not be executed. In that case we build a function body to hold that
158 -- code. This wrapper function serves no other purpose (it used to be
159 -- called to evaluate the default, but now the default is inlined at each
160 -- point of call).
163 -- Typ is a record or array type that is being frozen. This routine sets
164 -- the default component alignment from the scope stack values if the
165 -- alignment is otherwise not specified.
168 -- As each entity is frozen, this routine is called to deal with the
169 -- setting of Debug_Info_Needed for the entity. This flag is set if
170 -- the entity comes from source, or if we are in Debug_Generated_Code
171 -- mode or if the -gnatdV debug flag is set. However, it never sets
172 -- the flag if Debug_Info_Off is set. This procedure also ensures that
173 -- subsidiary entities have the flag set as required.
176 -- T is a type of a component that we know to be an Itype. We don't want
177 -- this to have a Freeze_Node, so ensure it doesn't. Do the same for any
178 -- Full_View or Corresponding_Record_Type.
180 procedure Warn_Overlay
184 -- Expr is the expression for an address clause for entity Nam whose type
185 -- is Typ. If Typ has a default initialization, and there is no explicit
186 -- initialization in the source declaration, check whether the address
187 -- clause might cause overlaying of an entity, and emit a warning on the
188 -- side effect that the initialization will cause.
190 -------------------------------
191 -- Adjust_Esize_For_Alignment --
192 -------------------------------
197 begin
203 then
209 ------------------------------------
210 -- Build_And_Analyze_Renamed_Body --
211 ------------------------------------
213 procedure Build_And_Analyze_Renamed_Body
217 is
223 begin
224 -- If the renamed subprogram is intrinsic, there is no need for a
225 -- wrapper body: we set the alias that will be called and expanded which
226 -- completes the declaration. This transformation is only legal if the
227 -- renamed entity has already been elaborated.
229 -- Note that it is legal for a renaming_as_body to rename an intrinsic
230 -- subprogram, as long as the renaming occurs before the new entity
231 -- is frozen. See RM 8.5.4 (5).
235 then
237 else
243 and then
247 -- We can make the renaming entity intrinsic if the renamed function
248 -- has an interface name, or if it is one of the shift/rotate
249 -- operations known to the compiler.
257 then
262 else
269 else
278 ------------------------
279 -- Build_Renamed_Body --
280 ------------------------
282 function Build_Renamed_Body
285 is
287 -- We use for the source location of the renamed body, the location of
288 -- the spec entity. It might seem more natural to use the location of
289 -- the renaming declaration itself, but that would be wrong, since then
290 -- the body we create would look as though it was created far too late,
291 -- and this could cause problems with elaboration order analysis,
292 -- particularly in connection with instantiations.
307 -- If the renamed entity is a primitive operation given in prefix form,
308 -- the prefix is the target object and it has to be added as the first
309 -- actual in the generated call.
311 begin
312 -- Determine the entity being renamed, which is the target of the call
313 -- statement. If the name is an explicit dereference, this is a renaming
314 -- of a subprogram type rather than a subprogram. The name itself is
315 -- fully analyzed.
326 else
333 else
339 -- If the renamed entity is a predefined operator, retain full name
340 -- to ensure its visibility.
344 then
346 else
350 else
353 and then
356 then
358 -- Retrieve the target object, to be added as a first actual
359 -- in the call.
364 else
368 -- Original name may have been overloaded, but is fully resolved now
373 -- For simple renamings, subsequent calls can be expanded directly as
374 -- calls to the renamed entity. The body must be generated in any case
375 -- for calls that may appear elsewhere. This is not done in the case
376 -- where the subprogram is an instantiation because the actual proper
377 -- body has not been built yet.
382 then
386 -- The body generated for this renaming is an internal artifact, and
387 -- does not constitute a freeze point for the called entity.
394 declare
398 begin
399 -- The controlling formal may be an access parameter, or the
400 -- actual may be an access value, so adjust accordingly.
404 then
405 Actuals := New_List
410 then
411 Actuals := New_List
415 else
423 else
434 -- If the renamed entity is an entry, inherit its profile. For other
435 -- renamings as bodies, both profiles must be subtype conformant, so it
436 -- is not necessary to replace the profile given in the declaration.
437 -- However, default values that are aggregates are rewritten when
438 -- partially analyzed, so we recover the original aggregate to insure
439 -- that subsequent conformity checking works. Similarly, if the default
440 -- expression was constant-folded, recover the original expression.
450 N_Access_Definition
451 then
459 then
470 -- If the renamed entity is a function, the generated body contains a
471 -- return statement. Otherwise, build a procedure call. If the entity is
472 -- an entry, subsequent analysis of the call will transform it into the
473 -- proper entry or protected operation call. If the renamed entity is
474 -- a character literal, return it directly.
480 then
481 Call_Node :=
483 Expression =>
489 Call_Node :=
494 Call_Node :=
498 else
499 Call_Node :=
505 -- Create entities for subprogram body and formals
518 Body_Node :=
522 Handled_Statement_Sequence =>
532 -- Link the body to the entity whose declaration it completes. If
533 -- the body is analyzed when the renamed entity is frozen, it may
534 -- be necessary to restore the proper scope (see package Exp_Ch13).
538 then
540 else
547 --------------------------
548 -- Check_Address_Clause --
549 --------------------------
557 begin
564 -- Has_Delayed_Freeze was set on E when the address clause was
565 -- analyzed. Reset the flag now unless freeze actions were
566 -- attached to it in the mean time.
573 -- If Rep_Clauses are to be ignored, remove address clause from
574 -- list attached to entity, because it may be illegal for gigi,
575 -- for example by breaking order of elaboration..
578 declare
581 begin
587 else
590 loop
604 then
610 -----------------------------
611 -- Check_Compile_Time_Size --
612 -----------------------------
617 -- Sets the compile time known size (32 bits or less) in the Esize
618 -- field, of T checking for a size clause that was given which attempts
619 -- to give a smaller size, and also checking for an alignment clause.
622 -- Recursive function that does all the work
625 -- If T is a constrained subtype, its size is not known if any of its
626 -- discriminant constraints is not static and it is not a null record.
627 -- The test is conservative and doesn't check that the components are
628 -- in fact constrained by non-static discriminant values. Could be made
629 -- more precise ???
631 --------------------
632 -- Set_Small_Size --
633 --------------------
636 begin
640 -- Check for bad size clause given
645 Error_Msg_NE
650 -- Set size if not set already
657 ----------------
658 -- Size_Known --
659 ----------------
668 begin
672 -- Always True for scalar types. This is true even for generic formal
673 -- scalar types. We used to return False in the latter case, but the
674 -- size is known at compile time, even in the template, we just do
675 -- not know the exact size but that's not the point of this routine.
679 then
682 -- Array types
686 -- String literals always have known size, and we can set it
693 -- Unconstrained types never have known at compile time size
698 -- Don't do any recursion on type with error posted, since we may
699 -- have a malformed type that leads us into a loop.
704 -- Otherwise if component size unknown, then array size unknown
710 -- Check for all indexes static, and also compute possible size
711 -- (in case it is less than 32 and may be packable).
713 declare
717 begin
726 else
734 then
737 else
742 else
754 -- Access types always have known at compile time sizes
759 -- For non-generic private types, go to underlying type if present
764 then
765 -- Don't do any recursion on type with error posted, since we may
766 -- have a malformed type that leads us into a loop.
770 else
774 -- Record types
778 -- A class-wide type is never considered to have a known size
783 -- A subtype of a variant record must not have non-static
784 -- discriminated components.
788 then
791 -- Don't do any recursion on type with error posted, since we may
792 -- have a malformed type that leads us into a loop.
798 -- Now look at the components of the record
800 declare
801 -- The following two variables are used to keep track of the
802 -- size of packed records if we can tell the size of the packed
803 -- record in the front end. Packed_Size_Known is True if so far
804 -- we can figure out the size. It is initialized to True for a
805 -- packed record, unless the record has discriminants. The
806 -- reason we eliminate the discriminated case is that we don't
807 -- know the way the back end lays out discriminated packed
808 -- records. If Packed_Size_Known is True, then Packed_Size is
809 -- the size in bits so far.
817 begin
818 -- Test for variant part present
824 N_Record_Definition
828 then
829 -- If variant part is present, and type is unconstrained,
830 -- then we must have defaulted discriminants, or a size
831 -- clause must be present for the type, or else the size
832 -- is definitely not known at compile time.
835 and then
838 then
843 -- Loop through components
849 -- We do not know the packed size if there is a component
850 -- clause present (we possibly could, but this would only
851 -- help in the case of a record with partial rep clauses.
852 -- That's because in the case of full rep clauses, the
853 -- size gets figured out anyway by a different circuit).
859 -- We need to identify a component that is an array where
860 -- the index type is an enumeration type with non-standard
861 -- representation, and some bound of the type depends on a
862 -- discriminant.
864 -- This is because gigi computes the size by doing a
865 -- substitution of the appropriate discriminant value in
866 -- the size expression for the base type, and gigi is not
867 -- clever enough to evaluate the resulting expression (which
868 -- involves a call to rep_to_pos) at compile time.
870 -- It would be nice if gigi would either recognize that
871 -- this expression can be computed at compile time, or
872 -- alternatively figured out the size from the subtype
873 -- directly, where all the information is at hand ???
877 then
878 declare
886 begin
893 then
899 then
904 then
914 -- Clearly size of record is not known if the size of one of
915 -- the components is not known.
921 -- Accumulate packed size if possible
925 -- We can only deal with elementary types, since for
926 -- non-elementary components, alignment enters into the
927 -- picture, and we don't know enough to handle proper
928 -- alignment in this context. Packed arrays count as
929 -- elementary if the representation is a modular type.
934 and then Is_Modular_Integer_Type
936 then
937 -- If RM_Size is known and static, then we can keep
938 -- accumulating the packed size.
942 -- A little glitch, to be removed sometime ???
943 -- gigi does not understand zero sizes yet.
948 -- Normal case where we can keep accumulating the
949 -- packed array size.
951 else
955 -- If we have a field whose RM_Size is not known then
956 -- we can't figure out the packed size here.
958 else
962 -- If we have a non-elementary type we can't figure out
963 -- the packed array size (alignment issues).
965 else
980 -- All other cases, size not known at compile time
982 else
987 -------------------------------------
988 -- Static_Discriminated_Components --
989 -------------------------------------
991 function Static_Discriminated_Components
993 is
996 begin
1000 then
1014 -- Start of processing for Check_Compile_Time_Size
1016 begin
1020 -----------------------------------
1021 -- Check_Component_Storage_Order --
1022 -----------------------------------
1024 procedure Check_Component_Storage_Order
1027 is
1034 -- Set True for the record case, when Comp starts on a byte boundary
1035 -- (in which case it is allowed to have different storage order).
1037 begin
1038 -- Record case
1045 Comp_Byte_Aligned :=
1049 -- Array case
1051 else
1054 Comp_Def := Component_Definition
1060 -- Note: the Reverse_Storage_Order flag is set on the base type, but
1061 -- the attribute definition clause is attached to the first subtype.
1064 ADC := Get_Attribute_Definition_Clause
1066 Attribute_Scalar_Storage_Order);
1074 /=
1076 and then not Comp_Byte_Aligned
1077 then
1078 Error_Msg_N
1084 Error_Msg_N
1090 -----------------------------
1091 -- Check_Debug_Info_Needed --
1092 -----------------------------
1095 begin
1100 or else Debug_Generated_Code
1101 or else Debug_Flag_VV
1103 then
1108 ----------------------------
1109 -- Check_Strict_Alignment --
1110 ----------------------------
1115 begin
1133 then
1143 -------------------------
1144 -- Check_Unsigned_Type --
1145 -------------------------
1152 begin
1157 -- Do not attempt to analyze case where range was in error
1161 then
1165 -- The situation that is non trivial is something like
1167 -- subtype x1 is integer range -10 .. +10;
1168 -- subtype x2 is x1 range 0 .. V1;
1169 -- subtype x3 is x2 range V2 .. V3;
1170 -- subtype x4 is x3 range V4 .. V5;
1172 -- where Vn are variables. Here the base type is signed, but we still
1173 -- know that x4 is unsigned because of the lower bound of x2.
1175 -- The only way to deal with this is to look up the ancestor chain
1178 loop
1193 else
1196 -- If no ancestor had a static lower bound, go to base type
1200 -- Note: the reason we still check for a compile time known
1201 -- value for the base type is that at least in the case of
1202 -- generic formals, we can have bounds that fail this test,
1203 -- and there may be other cases in error situations.
1215 then
1225 -------------------------
1226 -- Is_Atomic_Aggregate --
1227 -------------------------
1229 function Is_Atomic_Aggregate
1232 is
1238 begin
1241 -- Array may be qualified, so find outer context
1249 then
1251 New_N :=
1262 else
1267 ----------------
1268 -- Freeze_All --
1269 ----------------
1271 -- Note: the easy coding for this procedure would be to just build a
1272 -- single list of freeze nodes and then insert them and analyze them
1273 -- all at once. This won't work, because the analysis of earlier freeze
1274 -- nodes may recursively freeze types which would otherwise appear later
1275 -- on in the freeze list. So we must analyze and expand the freeze nodes
1276 -- as they are generated.
1283 -- This is the internal recursive routine that does freezing of entities
1284 -- (but NOT the analysis of default expressions, which should not be
1285 -- recursive, we don't want to analyze those till we are sure that ALL
1286 -- the types are frozen).
1288 --------------------
1289 -- Freeze_All_Ent --
1290 --------------------
1298 -- If freeze nodes are present, insert and analyze, and reset cursor
1299 -- for next insertion.
1301 -------------------
1302 -- Process_Flist --
1303 -------------------
1306 begin
1313 else
1319 -- Start or processing for Freeze_All_Ent
1321 begin
1325 -- If the entity is an inner package which is not a package
1326 -- renaming, then its entities must be frozen at this point. Note
1327 -- that such entities do NOT get frozen at the end of the nested
1328 -- package itself (only library packages freeze).
1330 -- Same is true for task declarations, where anonymous records
1331 -- created for entry parameters must be frozen.
1337 then
1348 then
1354 and then
1356 or else
1358 then
1361 End_Scope;
1363 -- For a derived tagged type, we must ensure that all the
1364 -- primitive operations of the parent have been frozen, so that
1365 -- their addresses will be in the parent's dispatch table at the
1366 -- point it is inherited.
1372 then
1373 declare
1380 begin
1387 then
1389 Process_Flist;
1399 Process_Flist;
1401 -- If already frozen, and there are delayed aspects, this is where
1402 -- we do the visibility check for these aspects (see Sem_Ch13 spec
1403 -- for a description of how we handle aspect visibility).
1407 -- Retrieve the visibility to the discriminants in order to
1408 -- analyze properly the aspects.
1412 declare
1415 begin
1421 then
1432 -- If an incomplete type is still not frozen, this may be a
1433 -- premature freezing because of a body declaration that follows.
1434 -- Indicate where the freezing took place. Freezing will happen
1435 -- if the body comes from source, but not if it is internally
1436 -- generated, for example as the body of a type invariant.
1438 -- If the freezing is caused by the end of the current declarative
1439 -- part, it is a Taft Amendment type, and there is no error.
1443 then
1444 declare
1447 begin
1448 -- The presence of a body freezes all entities previously
1449 -- declared in the current list of declarations, but this
1450 -- does not apply if the body does not come from source.
1451 -- A type invariant is transformed into a subprogram body
1452 -- which is placed at the end of the private part of the
1453 -- current package, but this body does not freeze incomplete
1454 -- types that may be declared in this private part.
1457 N_Entry_Body,
1458 N_Package_Body,
1459 N_Protected_Body,
1460 N_Task_Body)
1462 and then
1465 then
1467 Error_Msg_NE
1478 -- Start of processing for Freeze_All
1480 begin
1483 -- Now that all types are frozen, we can deal with default expressions
1484 -- that require us to build a default expression functions. This is the
1485 -- point at which such functions are constructed (after all types that
1486 -- might be used in such expressions have been frozen).
1488 -- For subprograms that are renaming_as_body, we create the wrapper
1489 -- bodies as needed.
1491 -- We also add finalization chains to access types whose designated
1492 -- types are controlled. This is normally done when freezing the type,
1493 -- but this misses recursive type definitions where the later members
1494 -- of the recursion introduce controlled components.
1496 -- Loop through entities
1512 else
1518 and then
1520 = N_Subprogram_Renaming_Declaration
1521 then
1522 Build_And_Analyze_Renamed_Body
1528 and then
1530 or else
1532 then
1533 declare
1536 begin
1541 then
1549 -- We add finalization masters to access types whose designated types
1550 -- require finalization. This is normally done when freezing the
1551 -- type, but this misses recursive type definitions where the later
1552 -- members of the recursion introduce controlled components (such as
1553 -- can happen when incomplete types are involved), as well cases
1554 -- where a component type is private and the controlled full type
1555 -- occurs after the access type is frozen. Cases that don't need a
1556 -- finalization master are generic formal types (the actual type will
1557 -- have it) and types with Java and CIL conventions, since those are
1558 -- used for API bindings. (Are there any other cases that should be
1559 -- excluded here???)
1565 then
1573 -----------------------
1574 -- Freeze_And_Append --
1575 -----------------------
1577 procedure Freeze_And_Append
1581 is
1583 begin
1587 else
1593 -------------------
1594 -- Freeze_Before --
1595 -------------------
1599 begin
1605 -------------------
1606 -- Freeze_Entity --
1607 -------------------
1619 -- List of freezing actions, left at No_List if none
1622 -- This flag gets set to true for a variable with default initialization
1625 -- N is a freezing action to be appended to the Result
1628 -- If Loc is a freeze_entity that appears after the last declaration
1629 -- in the scope, inhibit error messages on late completion.
1632 -- Check that an Access or Unchecked_Access attribute with a prefix
1633 -- which is the current instance type can only be applied when the type
1634 -- is limited.
1637 -- Give warning for modulus of 8, 16, 32, or 64 given as an explicit
1638 -- integer literal without an explicit corresponding size clause. The
1639 -- caller has checked that Utype is a modular integer type.
1642 -- Freeze each component, handle some representation clauses, and freeze
1643 -- primitive operations if this is a tagged type.
1645 -------------------
1646 -- Add_To_Result --
1647 -------------------
1650 begin
1653 else
1658 ----------------------------
1659 -- After_Last_Declaration --
1660 ----------------------------
1664 begin
1670 else
1673 else
1678 ----------------------------
1679 -- Check_Current_Instance --
1680 ----------------------------
1685 -- Determine whether Typ is compatible with the rules for aliased
1686 -- views of types as defined in RM 3.10 in the various dialects.
1689 -- Process routine to apply check to given node
1691 -----------------------------
1692 -- Is_Aliased_View_Of_Type --
1693 -----------------------------
1698 begin
1699 -- Common case
1703 then
1706 -- The following paragraphs describe what a legal aliased view of
1707 -- a type is in the various dialects of Ada.
1709 -- Ada 95
1711 -- The current instance of a limited type, and a formal parameter
1712 -- or generic formal object of a tagged type.
1714 -- Ada 95 limited type
1715 -- * Type with reserved word "limited"
1716 -- * A protected or task type
1717 -- * A composite type with limited component
1722 -- Ada 2005
1724 -- The current instance of a limited tagged type, a protected
1725 -- type, a task type, or a type that has the reserved word
1726 -- "limited" in its full definition ... a formal parameter or
1727 -- generic formal object of a tagged type.
1729 -- Ada 2005 limited type
1730 -- * Type with reserved word "limited", "synchronized", "task"
1731 -- or "protected"
1732 -- * A composite type with limited component
1733 -- * A derived type whose parent is a non-interface limited type
1736 return
1738 or else
1743 -- Ada 2012 and beyond
1745 -- The current instance of an immutably limited type ... a formal
1746 -- parameter or generic formal object of a tagged type.
1748 -- Ada 2012 limited type
1749 -- * Type with reserved word "limited", "synchronized", "task"
1750 -- or "protected"
1751 -- * A composite type with limited component
1752 -- * A derived type whose parent is a non-interface limited type
1753 -- * An incomplete view
1755 -- Ada 2012 immutably limited type
1756 -- * Explicitly limited record type
1757 -- * Record extension with "limited" present
1758 -- * Non-formal limited private type that is either tagged
1759 -- or has at least one access discriminant with a default
1760 -- expression
1761 -- * Task type, protected type or synchronized interface
1762 -- * Type derived from immutably limited type
1764 else
1765 return
1771 -------------
1772 -- Process --
1773 -------------
1776 begin
1780 or else
1785 then
1786 Error_Msg_N
1789 else
1799 -- Local variables
1804 -- Start of processing for Check_Current_Instance
1806 begin
1812 ------------------------------
1813 -- Check_Suspicious_Modulus --
1814 ------------------------------
1819 begin
1821 declare
1824 begin
1826 declare
1829 begin
1831 declare
1835 begin
1836 -- First case, modulus and size are the same. This
1837 -- happens if you have something like mod 32, with
1838 -- an explicit size of 32, this is for sure a case
1839 -- where the warning is given, since it is seems
1840 -- very unlikely that someone would want e.g. a
1841 -- five bit type stored in 32 bits. It is much
1842 -- more likely they wanted a 32-bit type.
1847 -- Second case, the modulus is 32 or 64 and no
1848 -- size clause is present. This is a less clear
1849 -- case for giving the warning, but in the case
1850 -- of 32/64 (5-bit or 6-bit types) these seem rare
1851 -- enough that it is a likely error (and in any
1852 -- case using 2**5 or 2**6 in these cases seems
1853 -- clearer. We don't include 8 or 16 here, simply
1854 -- because in practice 3-bit and 4-bit types are
1855 -- more common and too many false positives if
1856 -- we warn in these cases.
1860 then
1863 -- No warning needed
1865 else
1869 -- If we fall through, give warning
1872 Error_Msg_N
1874 Modulus);
1883 ------------------------
1884 -- Freeze_Record_Type --
1885 ------------------------
1897 -- Set True if the record type scope Rec has been pushed on the scope
1898 -- stack. Needed for the analysis of delayed aspects specified to the
1899 -- components of Rec.
1902 -- Set True if we find at least one component with no component
1903 -- clause (used to warn about useless Pack pragmas).
1906 -- Set True if we find at least one component with a component
1907 -- clause (used to warn about useless Bit_Order pragmas, and also
1908 -- to detect cases where Implicit_Packing may have an effect).
1911 -- Set False if we encounter a component of a non-scalar type
1915 -- Accumulates total RM_Size values and total Esize values of all
1916 -- scalar components. Used for processing of Implicit_Packing.
1919 -- If N is an allocator, possibly wrapped in one or more level of
1920 -- qualified expression(s), return the inner allocator node, else
1921 -- return Empty.
1924 -- If the component subtype is an access to a constrained subtype of
1925 -- an already frozen type, make the subtype frozen as well. It might
1926 -- otherwise be frozen in the wrong scope, and a freeze node on
1927 -- subtype has no effect. Similarly, if the component subtype is a
1928 -- regular (not protected) access to subprogram, set the anonymous
1929 -- subprogram type to frozen as well, to prevent an out-of-scope
1930 -- freeze node at some eventual point of call. Protected operations
1931 -- are handled elsewhere.
1933 ---------------------
1934 -- Check_Allocator --
1935 ---------------------
1939 begin
1941 loop
1946 else
1952 -----------------
1953 -- Check_Itype --
1954 -----------------
1959 begin
1962 then
1965 -- In addition, add an Itype_Reference to ensure that the
1966 -- access subtype is elaborated early enough. This cannot be
1967 -- done if the subtype may depend on discriminants.
1972 then
1980 then
1985 -- Start of processing for Freeze_Record_Type
1987 begin
1988 -- Deal with delayed aspect specifications for components. The
1989 -- analysis of the aspect is required to be delayed to the freeze
1990 -- point, thus we analyze the pragma or attribute definition
1991 -- clause in the tree at this point. We also analyze the aspect
1992 -- specification node at the freeze point when the aspect doesn't
1993 -- correspond to pragma/attribute definition clause.
1999 then
2004 -- The visibility to the discriminants must be restored in
2005 -- order to properly analyze the aspects.
2018 -- Pop the scope if Rec scope has been pushed on the scope stack
2019 -- during the delayed aspect analysis process.
2026 Pop_Scope;
2029 -- Freeze components and embedded subtypes
2035 -- Handle the component and discriminant case
2038 declare
2041 begin
2042 -- Freezing a record type freezes the type of each of its
2043 -- components. However, if the type of the component is
2044 -- part of this record, we do not want or need a separate
2045 -- Freeze_Node. Note that Is_Itype is wrong because that's
2046 -- also set in private type cases. We also can't check for
2047 -- the Scope being exactly Rec because of private types and
2048 -- record extensions.
2053 then
2059 -- Check for error of component clause given for variable
2060 -- sized type. We have to delay this test till this point,
2061 -- since the component type has to be frozen for us to know
2062 -- if it is variable length. We omit this test in a generic
2063 -- context, it will be applied at instantiation time.
2065 -- We also omit this test in CodePeer mode, since we do not
2066 -- have sufficient info on size and representation clauses.
2077 elsif not
2078 Size_Known_At_Compile_Time
2080 then
2081 Error_Msg_N
2086 else
2090 -- Case of component requires byte alignment
2094 -- Set the enclosing record to also require byte align
2098 -- Check for component clause that is inconsistent with
2099 -- the required byte boundary alignment.
2104 then
2105 Error_Msg_N
2113 -- Gather data for possible Implicit_Packing later. Note that at
2114 -- this stage we might be dealing with a real component, or with
2115 -- an implicit subtype declaration.
2119 else
2120 Scalar_Component_Total_RM_Size :=
2122 Scalar_Component_Total_Esize :=
2126 -- If the component is an Itype with Delayed_Freeze and is either
2127 -- a record or array subtype and its base type has not yet been
2128 -- frozen, we must remove this from the entity list of this record
2129 -- and put it on the entity list of the scope of its base type.
2130 -- Note that we know that this is not the type of a component
2131 -- since we cleared Has_Delayed_Freeze for it in the previous
2132 -- loop. Thus this must be the Designated_Type of an access type,
2133 -- which is the type of a component.
2141 then
2142 declare
2146 begin
2147 -- We have a pretty bad kludge here. Suppose Rec is subtype
2148 -- being defined in a subprogram that's created as part of
2149 -- the freezing of Rec'Base. In that case, we know that
2150 -- Comp'Base must have already been frozen by the time we
2151 -- get to elaborate this because Gigi doesn't elaborate any
2152 -- bodies until it has elaborated all of the declarative
2153 -- part. But Is_Frozen will not be set at this point because
2154 -- we are processing code in lexical order.
2156 -- We detect this case by going up the Scope chain of Rec
2157 -- and seeing if we have a subprogram scope before reaching
2158 -- the top of the scope chain or that of Comp'Base. If we
2159 -- do, then mark that Comp'Base will actually be frozen. If
2160 -- so, we merely undelay it.
2176 else
2179 else
2183 -- Insert in entity list of scope of base type (which
2184 -- must be an enclosing scope, because still unfrozen).
2190 -- If the component is an access type with an allocator as default
2191 -- value, the designated type will be frozen by the corresponding
2192 -- expression in init_proc. In order to place the freeze node for
2193 -- the designated type before that for the current record type,
2194 -- freeze it now.
2196 -- Same process if the component is an array of access types,
2197 -- initialized with an aggregate. If the designated type is
2198 -- private, it cannot contain allocators, and it is premature
2199 -- to freeze the type, so we check for this as well.
2204 then
2205 declare
2209 begin
2212 -- If component is pointer to a classwide type, freeze
2213 -- the specific type in the expression being allocated.
2214 -- The expression may be a subtype indication, in which
2215 -- case freeze the subtype mark.
2217 if Is_Class_Wide_Type
2219 then
2221 Freeze_And_Append
2223 elsif
2225 then
2226 Freeze_And_Append
2234 else
2235 Freeze_And_Append
2243 then
2252 and then Is_Fully_Defined
2254 then
2255 Freeze_And_Append
2256 (Designated_Type
2264 ADC := Get_Attribute_Definition_Clause
2269 -- Check compatibility of Scalar_Storage_Order with Bit_Order, if
2270 -- the former is specified.
2274 -- Note: report error on Rec, not on ADC, as ADC may apply to
2275 -- an ancestor type.
2278 Error_Msg_N
2283 -- Warn if there is a Scalar_Storage_Order but no component clause
2284 -- (or pragma Pack).
2287 Error_Msg_N
2289 ADC);
2292 -- Check attribute on component types
2301 -- Deal with Bit_Order aspect specifying a non-default bit order
2308 Error_Msg_N
2311 -- Here is where we do the processing for reversed bit order
2315 then
2318 -- Case where we have both an explicit Bit_Order and the same
2319 -- Scalar_Storage_Order: leave record untouched, the back-end
2320 -- will take care of required layout conversions.
2322 else
2328 -- Complete error checking on record representation clause (e.g.
2329 -- overlap of components). This is called after adjusting the
2330 -- record for reverse bit order.
2332 declare
2334 begin
2340 -- Set OK_To_Reorder_Components depending on debug flags
2344 or else
2346 then
2351 -- Check for useless pragma Pack when all components placed. We only
2352 -- do this check for record types, not subtypes, since a subtype may
2353 -- have all its components placed, and it still makes perfectly good
2354 -- sense to pack other subtypes or the parent type. We do not give
2355 -- this warning if Optimize_Alignment is set to Space, since the
2356 -- pragma Pack does have an effect in this case (it always resets
2357 -- the alignment to one).
2361 and then not Unplaced_Component
2363 then
2364 -- Reset packed status. Probably not necessary, but we do it so
2365 -- that there is no chance of the back end doing something strange
2366 -- with this redundant indication of packing.
2370 -- Give warning if redundant constructs warnings on
2373 Error_Msg_N -- CODEFIX
2379 -- If this is the record corresponding to a remote type, freeze the
2380 -- remote type here since that is what we are semantically freezing.
2381 -- This prevents the freeze node for that type in an inner scope.
2383 -- Also, Check for controlled components and unchecked unions.
2384 -- Finally, enforce the restriction that access attributes with a
2385 -- current instance prefix can only apply to limited types.
2395 -- Do not set Has_Controlled_Component on a class-wide
2396 -- equivalent type. See Make_CW_Equivalent_Type.
2403 and then Present
2404 (Corresponding_Record_Type
2406 and then Has_Controlled_Component
2407 (Corresponding_Record_Type
2409 then
2417 -- Scan component declaration for likely misuses of current
2418 -- instance, either in a constraint or a default expression.
2430 -- For first subtypes, check if there are any fixed-point fields with
2431 -- component clauses, where we must check the size. This is not done
2432 -- till the freeze point, since for fixed-point types, we do not know
2433 -- the size until the type is frozen. Similar processing applies to
2434 -- bit packed arrays.
2441 or else
2443 then
2444 Check_Size
2448 Junk);
2455 -- Generate warning for applying C or C++ convention to a record
2456 -- with discriminants. This is suppressed for the unchecked union
2457 -- case, since the whole point in this case is interface C. We also
2458 -- do not generate this within instantiations, since we will have
2459 -- generated a message on the template.
2464 or else
2467 and then not In_Instance
2470 then
2471 declare
2475 begin
2480 Error_Msg_N
2482 else
2483 Error_Msg_N
2487 Error_Msg_NE
2493 -- See if Size is too small as is (and implicit packing might help)
2497 -- No implicit packing if even one component is explicitly placed
2499 and then not Placed_Component
2501 -- Must have size clause and all scalar components
2504 and then All_Scalar_Components
2506 -- Do not try implicit packing on records with discriminants, too
2507 -- complicated, especially in the variant record case.
2511 -- We can implicitly pack if the specified size of the record is
2512 -- less than the sum of the object sizes (no point in packing if
2513 -- this is not the case).
2517 -- And the total RM size cannot be greater than the specified size
2518 -- since otherwise packing will not get us where we have to be!
2522 -- Never do implicit packing in CodePeer or Alfa modes since
2523 -- we don't do any packing in these modes, since this generates
2524 -- over-complex code that confuses static analysis, and in
2525 -- general, neither CodePeer not GNATprove care about the
2526 -- internal representation of objects.
2529 then
2530 -- If implicit packing enabled, do it
2535 -- Otherwise flag the size clause
2537 else
2538 declare
2540 begin
2541 Error_Msg_NE -- CODEFIX
2543 Error_Msg_N -- CODEFIX
2551 -- Start of processing for Freeze_Entity
2553 begin
2554 -- We are going to test for various reasons why this entity need not be
2555 -- frozen here, but in the case of an Itype that's defined within a
2556 -- record, that test actually applies to the record.
2562 then
2566 -- Do not freeze if already frozen since we only need one freeze node
2571 -- It is improper to freeze an external entity within a generic because
2572 -- its freeze node will appear in a non-valid context. The entity will
2573 -- be frozen in the proper scope after the current generic is analyzed.
2574 -- However, aspects must be analyzed because they may be queried later
2575 -- within the generic itself, and the corresponding pragma or attribute
2576 -- definition has not been analyzed yet.
2585 -- AI05-0213: A formal incomplete type does not freeze the actual. In
2586 -- the instance, the same applies to the subtype renaming the actual.
2592 then
2595 -- Do not freeze a global entity within an inner scope created during
2596 -- expansion. A call to subprogram E within some internal procedure
2597 -- (a stream attribute for example) might require freezing E, but the
2598 -- freeze node must appear in the same declarative part as E itself.
2599 -- The two-pass elaboration mechanism in gigi guarantees that E will
2600 -- be frozen before the inner call is elaborated. We exclude constants
2601 -- from this test, because deferred constants may be frozen early, and
2602 -- must be diagnosed (e.g. in the case of a deferred constant being used
2603 -- in a default expression). If the enclosing subprogram comes from
2604 -- source, or is a generic instance, then the freeze point is the one
2605 -- mandated by the language, and we freeze the entity. A subprogram that
2606 -- is a child unit body that acts as a spec does not have a spec that
2607 -- comes from source, but can only come from source.
2612 then
2613 declare
2616 begin
2623 then
2625 else
2634 -- Similarly, an inlined instance body may make reference to global
2635 -- entities, but these references cannot be the proper freezing point
2636 -- for them, and in the absence of inlining freezing will take place in
2637 -- their own scope. Normally instance bodies are analyzed after the
2638 -- enclosing compilation, and everything has been frozen at the proper
2639 -- place, but with front-end inlining an instance body is compiled
2640 -- before the end of the enclosing scope, and as a result out-of-order
2641 -- freezing must be prevented.
2643 elsif Front_End_Inlining
2644 and then In_Instance_Body
2646 then
2647 declare
2650 begin
2655 else
2666 -- Add checks to detect proper initialization of scalars that may appear
2667 -- as subprogram parameters.
2670 and then Check_Validity_Of_Parameters
2671 then
2675 -- Deal with delayed aspect specifications. The analysis of the aspect
2676 -- is required to be delayed to the freeze point, thus we analyze the
2677 -- pragma or attribute definition clause in the tree at this point. We
2678 -- also analyze the aspect specification node at the freeze point when
2679 -- the aspect doesn't correspond to pragma/attribute definition clause.
2685 -- Here to freeze the entity
2689 -- Case of entity being frozen is other than a type
2692 -- If entity is exported or imported and does not have an external
2693 -- name, now is the time to provide the appropriate default name.
2694 -- Skip this if the entity is stubbed, since we don't need a name
2695 -- for any stubbed routine. For the case on intrinsics, if no
2696 -- external name is specified, then calls will be handled in
2697 -- Exp_Intr.Expand_Intrinsic_Call, and no name is needed. If an
2698 -- external name is provided, then Expand_Intrinsic_Call leaves
2699 -- calls in place for expansion by GIGI.
2705 then
2706 Set_Encoded_Interface_Name
2709 -- If entity is an atomic object appearing in a declaration and
2710 -- the expression is an aggregate, assign it to a temporary to
2711 -- ensure that the actual assignment is done atomically rather
2712 -- than component-wise (the assignment to the temp may be done
2713 -- component-wise, but that is harmless).
2720 then
2724 -- For a subprogram, freeze all parameter types and also the return
2725 -- type (RM 13.14(14)). However skip this for internal subprograms.
2726 -- This is also the point where any extra formal parameters are
2727 -- created since we now know whether the subprogram will use a
2728 -- foreign convention.
2732 declare
2737 begin
2738 -- Loop through formals
2744 -- AI05-0151 : incomplete types can appear in a profile.
2745 -- By the time the entity is frozen, the full view must
2746 -- be available, unless it is a limited view.
2750 then
2762 then
2763 -- If the type of a formal is incomplete, subprogram
2764 -- is being frozen prematurely. Within an instance
2765 -- (but not within a wrapper package) this is an
2766 -- artifact of our need to regard the end of an
2767 -- instantiation as a freeze point. Otherwise it is
2768 -- a definite error.
2774 elsif not After_Last_Declaration
2775 and then not Freezing_Library_Level_Tagged_Type
2776 then
2778 Error_Msg
2780 Loc);
2784 -- Check suspicious parameter for C function. These tests
2785 -- apply only to exported/imported subprograms.
2787 if Warn_On_Export_Import
2790 or else
2797 then
2798 -- Qualify mention of formals with subprogram name
2802 -- Check suspicious use of fat C pointer
2806 then
2807 Error_Msg_N
2809 Formal);
2811 -- Check suspicious return of boolean
2818 then
2820 Error_Msg_N
2824 -- Check suspicious tagged type
2828 and then
2829 Is_Tagged_Type
2832 then
2833 Error_Msg_N
2837 -- Check wrong convention subprogram pointer
2841 then
2842 Error_Msg_N
2846 Error_Msg_NE
2851 -- Turn off name qualification after message output
2856 -- Check for unconstrained array in exported foreign
2857 -- convention case.
2863 and then Warn_On_Export_Import
2865 -- Exclude VM case, since both .NET and JVM can handle
2866 -- unconstrained arrays without a problem.
2869 then
2872 -- If this is an inherited operation, place the
2873 -- warning on the derived type declaration, rather
2874 -- than on the original subprogram.
2877 N_Full_Type_Declaration
2878 then
2882 Error_Msg_NE
2885 else
2889 Error_Msg_NE
2892 Error_Msg_NE
2903 -- If the formal is an anonymous_access_to_subprogram
2904 -- freeze the subprogram type as well, to prevent
2905 -- scope anomalies in gigi, because there is no other
2906 -- clear point at which it could be frozen.
2910 then
2918 -- Case of function: similar checks on return type
2922 -- Freeze return type
2926 -- AI05-0151: the return type may have been incomplete
2927 -- at the point of declaration.
2931 then
2938 -- Check suspicious return type for C function
2940 if Warn_On_Export_Import
2942 or else
2945 then
2946 -- Check suspicious return of fat C pointer
2952 then
2953 Error_Msg_N
2957 -- Check suspicious return of boolean
2965 then
2966 declare
2969 begin
2970 Error_Msg_NE
2973 Error_Msg_NE
2978 -- Check suspicious return tagged type
2982 and then
2983 Is_Tagged_Type
2988 then
2989 Error_Msg_N
2993 -- Check return of wrong convention subprogram pointer
2999 then
3000 Error_Msg_N
3004 Error_Msg_NE
3010 -- Give warning for suspicious return of a result of an
3011 -- unconstrained array type in a foreign convention
3012 -- function.
3016 -- We are looking for a return of unconstrained array
3021 -- Exclude imported routines, the warning does not
3022 -- belong on the import, but rather on the routine
3023 -- definition.
3027 -- Exclude VM case, since both .NET and JVM can handle
3028 -- return of unconstrained arrays without a problem.
3032 -- Check that general warning is enabled, and that it
3033 -- is not suppressed for this particular case.
3035 and then Warn_On_Export_Import
3038 then
3039 Error_Msg_N
3046 -- Pre/post conditions are implemented through a subprogram in
3047 -- the corresponding body, and therefore are not checked on an
3048 -- imported subprogram for which the body is not available.
3050 -- Could consider generating a wrapper to take care of this???
3056 then
3064 -- Must freeze its parent first if it is a derived subprogram
3070 -- We don't freeze internal subprograms, because we don't normally
3071 -- want addition of extra formals or mechanism setting to happen
3072 -- for those. However we do pass through predefined dispatching
3073 -- cases, since extra formals may be needed in some cases, such as
3074 -- for the stream 'Input function (build-in-place formals).
3078 then
3082 -- Here for other than a subprogram or type
3084 else
3085 -- If entity has a type, and it is not a generic unit, then
3086 -- freeze it first (RM 13.14(10)).
3090 then
3094 -- Special processing for objects created by object declaration
3098 -- Abstract type allowed only for C++ imported variables or
3099 -- constants.
3101 -- Note: we inhibit this check for objects that do not come
3102 -- from source because there is at least one case (the
3103 -- expansion of x'Class'Input where x is abstract) where we
3104 -- legitimately generate an abstract object.
3110 then
3115 Error_Msg_NE
3121 -- For object created by object declaration, perform required
3122 -- categorization (preelaborate and pure) checks. Defer these
3123 -- checks to freeze time since pragma Import inhibits default
3124 -- initialization and thus pragma Import affects these checks.
3128 -- If there is an address clause, check that it is valid
3132 -- If the object needs any kind of default initialization, an
3133 -- error must be issued if No_Default_Initialization applies.
3134 -- The check doesn't apply to imported objects, which are not
3135 -- ever default initialized, and is why the check is deferred
3136 -- until freezing, at which point we know if Import applies.
3137 -- Deferred constants are also exempted from this test because
3138 -- their completion is explicit, or through an import pragma.
3142 then
3148 and then
3153 or else
3156 then
3158 Check_Restriction
3162 -- Check that a Thread_Local_Storage variable does not have
3163 -- default initialization, and any explicit initialization must
3164 -- either be the null constant or a static constant.
3167 declare
3169 begin
3170 if Has_Default_Initialization
3171 or else
3173 and then
3175 or else not
3177 or else
3179 then
3180 Error_Msg_NE
3183 Error_Msg_NE
3190 -- For imported objects, set Is_Public unless there is also an
3191 -- address clause, which means that there is no external symbol
3192 -- needed for the Import (Is_Public may still be set for other
3193 -- unrelated reasons). Note that we delayed this processing
3194 -- till freeze time so that we can be sure not to set the flag
3195 -- if there is an address clause. If there is such a clause,
3196 -- then the only purpose of the Import pragma is to suppress
3197 -- implicit initialization.
3201 then
3205 -- For convention C objects of an enumeration type, warn if
3206 -- the size is not integer size and no explicit size given.
3207 -- Skip warning for Boolean, and Character, assume programmer
3208 -- expects 8-bit sizes for these cases.
3211 or else
3218 then
3220 Error_Msg_N
3222 E);
3227 -- Check that a constant which has a pragma Volatile[_Components]
3228 -- or Atomic[_Components] also has a pragma Import (RM C.6(13)).
3230 -- Note: Atomic[_Components] also sets Volatile[_Components]
3235 then
3236 -- Make sure we actually have a pragma, and have not merely
3237 -- inherited the indication from elsewhere (e.g. an address
3238 -- clause, which is not good enough in RM terms!)
3241 or else
3243 then
3244 Error_Msg_N
3249 or else
3251 then
3252 Error_Msg_N
3258 -- Static objects require special handling
3262 then
3266 -- Remaining step is to layout objects
3269 or else
3271 or else
3273 or else
3275 then
3280 -- Case of a type or subtype being frozen
3282 else
3283 -- We used to check here that a full type must have preelaborable
3284 -- initialization if it completes a private type specified with
3285 -- pragma Preelaborable_Initialization, but that missed cases where
3286 -- the types occur within a generic package, since the freezing
3287 -- that occurs within a containing scope generally skips traversal
3288 -- of a generic unit's declarations (those will be frozen within
3289 -- instances). This check was moved to Analyze_Package_Specification.
3291 -- The type may be defined in a generic unit. This can occur when
3292 -- freezing a generic function that returns the type (which is
3293 -- defined in a parent unit). It is clearly meaningless to freeze
3294 -- this type. However, if it is a subtype, its size may be determi-
3295 -- nable and used in subsequent checks, so might as well try to
3296 -- compute it.
3298 -- In Ada 2012, Freeze_Entities is also used in the front end to
3299 -- trigger the analysis of aspect expressions, so in this case we
3300 -- want to continue the freezing process.
3305 then
3310 -- Deal with special cases of freezing for subtype
3314 -- Before we do anything else, a specialized test for the case of
3315 -- a size given for an array where the array needs to be packed,
3316 -- but was not so the size cannot be honored. This would of course
3317 -- be caught by the backend, and indeed we don't catch all cases.
3318 -- The point is that we can give a better error message in those
3319 -- cases that we do catch with the circuitry here. Also if pragma
3320 -- Implicit_Packing is set, this is where the packing occurs.
3322 -- The reason we do this so early is that the processing in the
3323 -- automatic packing case affects the layout of the base type, so
3324 -- it must be done before we freeze the base type.
3327 declare
3331 begin
3332 -- Check enabling conditions. These are straightforward
3333 -- except for the test for a limited composite type. This
3334 -- eliminates the rare case of a array of limited components
3335 -- where there are issues of whether or not we can go ahead
3336 -- and pack the array (since we can't freely pack and unpack
3337 -- arrays if they are limited).
3339 -- Note that we check the root type explicitly because the
3340 -- whole point is we are doing this test before we have had
3341 -- a chance to freeze the base type (and it is that freeze
3342 -- action that causes stuff to be inherited).
3355 then
3362 then
3363 declare
3373 -- What we are looking for here is the situation where
3374 -- the RM_Size given would be exactly right if there
3375 -- was a pragma Pack (resulting in the component size
3376 -- being the same as the RM_Size). Furthermore, the
3377 -- component type size must be an odd size (not a
3378 -- multiple of storage unit). If the component RM size
3379 -- is an exact number of storage units that is a power
3380 -- of two, the array is not packed and has a standard
3381 -- representation.
3383 begin
3386 then
3387 -- For implicit packing mode, just set the
3388 -- component size silently.
3396 -- Otherwise give an error message
3398 else
3399 Error_Msg_NE
3401 Error_Msg_N -- CODEFIX
3407 and then Implicit_Packing
3408 and then
3412 then
3414 -- Not a packed array, but indicate the desired
3415 -- component size, for the back-end.
3425 -- If ancestor subtype present, freeze that first. Note that this
3426 -- will also get the base type frozen. Need RM reference ???
3433 -- No ancestor subtype present
3435 else
3436 -- See if we have a nearest ancestor that has a predicate.
3437 -- That catches the case of derived type with a predicate.
3438 -- Need RM reference here ???
3446 -- Freeze base type before freezing the entity (RM 13.14(15))
3453 -- A subtype inherits all the type-related representation aspects
3454 -- from its parents (RM 13.1(8)).
3458 -- For a derived type, freeze its parent type first (RM 13.14(15))
3464 -- A derived type inherits each type-related representation aspect
3465 -- of its parent type that was directly specified before the
3466 -- declaration of the derived type (RM 13.1(15)).
3471 -- For array type, freeze index types and component type first
3472 -- before freezing the array (RM 13.14(15)).
3475 declare
3481 -- Set true if any of the index types is an enumeration type
3482 -- with a non-standard representation.
3484 begin
3493 then
3500 -- Processing that is done only for base types
3504 -- Propagate flags for component type
3508 then
3516 -- If packing was requested or if the component size was set
3517 -- explicitly, then see if bit packing is required. This
3518 -- processing is only done for base types, since all the
3519 -- representation aspects involved are type-related. This
3520 -- is not just an optimization, if we start processing the
3521 -- subtypes, they interfere with the settings on the base
3522 -- type (this is because Is_Packed has a slightly different
3523 -- meaning before and after freezing).
3525 declare
3529 begin
3533 then
3542 else
3545 -- We can set the component size if it is less than
3546 -- 16, rounding it up to the next storage unit size.
3552 else
3556 -- Set component size up to match alignment if it
3557 -- would otherwise be less than the alignment. This
3558 -- deals with cases of types whose alignment exceeds
3559 -- their size (padded types).
3562 declare
3564 begin
3572 -- Case of component size that may result in packing
3575 declare
3581 Get_Attribute_Definition_Clause
3583 begin
3584 -- Warn if we have pack and component size so that
3585 -- the pack is ignored.
3587 -- Note: here we must check for the presence of a
3588 -- component size before checking for a Pack pragma
3589 -- to deal with the case where the array type is a
3590 -- derived type whose parent is currently private.
3594 and then Warn_On_Redundant_Constructs
3595 then
3597 Error_Msg_NE
3600 Error_Msg_N
3602 Pack_Pragma);
3607 -- Set component size if not already set by a
3608 -- component size clause.
3614 -- Check for base type of 8, 16, 32 bits, where an
3615 -- unsigned subtype has a length one less than the
3616 -- base type (e.g. Natural subtype of Integer).
3618 -- In such cases, if a component size was not set
3619 -- explicitly, then generate a warning.
3623 and then
3626 then
3630 Error_Msg_N
3633 Error_Msg_N
3639 -- Actual packing is not needed for 8, 16, 32, 64.
3640 -- Also not needed for 24 if alignment is 1.
3647 then
3648 -- Here the array was requested to be packed,
3649 -- but the packing request had no effect, so
3650 -- Is_Packed is reset.
3652 -- Note: semantically this means that we lose
3653 -- track of the fact that a derived type
3654 -- inherited a pragma Pack that was non-
3655 -- effective, but that seems fine.
3657 -- We regard a Pack pragma as a request to set
3658 -- a representation characteristic, and this
3659 -- request may be ignored.
3666 then
3667 Set_Has_Non_Standard_Rep
3671 -- In all other cases, packing is indeed needed
3673 else
3682 -- Check for Atomic_Components or Aliased with unsuitable
3683 -- packing or explicit component size clause given.
3689 then
3693 -- Outputs error messages for incorrect CS clause or
3694 -- pragma Pack for aliased or atomic components (T is
3695 -- "aliased" or "atomic");
3697 -----------------
3698 -- Complain_CS --
3699 -----------------
3702 begin
3704 Clause :=
3705 Get_Attribute_Definition_Clause
3709 Error_Msg_N
3713 Error_Msg_N
3716 else
3717 Error_Msg_N
3722 else
3723 Error_Msg_N
3731 -- Start of processing for Alias_Atomic_Check
3733 begin
3735 -- If object size of component type isn't known, we
3736 -- cannot be sure so we defer to the back end.
3741 -- Case where component size has no effect. First
3742 -- check for object size of component type multiple
3743 -- of the storage unit size.
3747 -- OK in both packing case and component size case
3748 -- if RM size is known and static and the same as
3749 -- the object size.
3751 and then
3755 -- Or if we have an explicit component size
3756 -- clause and the component size and object size
3757 -- are equal.
3759 or else
3762 then
3767 then
3772 then
3778 -- Warn for case of atomic type
3784 then
3785 Error_Msg_NE
3790 Error_Msg_Sloc :=
3791 Sloc
3792 (Get_Attribute_Definition_Clause
3794 Error_Msg_N
3796 Clause);
3799 Error_Msg_Sloc :=
3801 Error_Msg_N
3806 -- Check for scalar storage order
3810 then
3814 -- Processing that is done only for subtypes
3816 else
3817 -- Acquire alignment from base type
3825 -- For bit-packed arrays, check the size
3828 declare
3834 begin
3835 -- It is not clear if it is possible to have no size
3836 -- clause at this stage, but it is not worth worrying
3837 -- about. Post error on the entity name in the size
3838 -- clause if present, else on the type entity itself.
3842 else
3848 -- If any of the index types was an enumeration type with a
3849 -- non-standard rep clause, then we indicate that the array
3850 -- type is always packed (even if it is not bit packed).
3859 -- If the array is packed, we must create the packed array
3860 -- type to be used to actually implement the type. This is
3861 -- only needed for real array types (not for string literal
3862 -- types, since they are present only for the front end).
3866 then
3870 -- Size information of packed array type is copied to the
3871 -- array type, since this is really the representation. But
3872 -- do not override explicit existing size values. If the
3873 -- ancestor subtype is constrained the packed_array_type
3874 -- will be inherited from it, but the size may have been
3875 -- provided already, and must not be overridden either.
3878 and then
3881 then
3891 -- For non-packed arrays set the alignment of the array to the
3892 -- alignment of the component type if it is unknown. Skip this
3893 -- in atomic case (atomic arrays may need larger alignments).
3902 then
3907 -- For a class-wide type, the corresponding specific type is
3908 -- frozen as well (RM 13.14(15))
3913 -- If the base type of the class-wide type is still incomplete,
3914 -- the class-wide remains unfrozen as well. This is legal when
3915 -- E is the formal of a primitive operation of some other type
3916 -- which is being frozen.
3923 -- The equivalent type associated with a class-wide subtype needs
3924 -- to be frozen to ensure that its layout is done.
3928 then
3932 -- Generate an itype reference for a library-level class-wide type
3933 -- at the freeze point. Otherwise the first explicit reference to
3934 -- the type may appear in an inner scope which will be rejected by
3935 -- the back-end.
3939 then
3940 declare
3943 begin
3946 -- From a gigi point of view, a class-wide subtype derives
3947 -- from its record equivalent type. As a result, the itype
3948 -- reference must appear after the freeze node of the
3949 -- equivalent type or gigi will reject the reference.
3953 then
3955 else
3961 -- For a record type or record subtype, freeze all component types
3962 -- (RM 13.14(15)). We test for E_Record_(sub)Type here, rather than
3963 -- using Is_Record_Type, because we don't want to attempt the freeze
3964 -- for the case of a private type with record extension (we will do
3965 -- that later when the full type is frozen).
3970 -- For a concurrent type, freeze corresponding record type. This
3971 -- does not correspond to any specific rule in the RM, but the
3972 -- record type is essentially part of the concurrent type.
3973 -- Freeze as well all local entities. This includes record types
3974 -- created for entry parameter blocks, and whatever local entities
3975 -- may appear in the private part.
3979 Freeze_And_Append
3991 then
4001 -- Private types are required to point to the same freeze node as
4002 -- their corresponding full views. The freeze node itself has to
4003 -- point to the partial view of the entity (because from the partial
4004 -- view, we can retrieve the full view, but not the reverse).
4005 -- However, in order to freeze correctly, we need to freeze the full
4006 -- view. If we are freezing at the end of a scope (or within the
4007 -- scope of the private type), the partial and full views will have
4008 -- been swapped, the full view appears first in the entity chain and
4009 -- the swapping mechanism ensures that the pointers are properly set
4010 -- (on scope exit).
4012 -- If we encounter the partial view before the full view (e.g. when
4013 -- freezing from another scope), we freeze the full view, and then
4014 -- set the pointers appropriately since we cannot rely on swapping to
4015 -- fix things up (subtypes in an outer scope might not get swapped).
4019 then
4020 -- The construction of the dispatch table associated with library
4021 -- level tagged types forces freezing of all the primitives of the
4022 -- type, which may cause premature freezing of the partial view.
4023 -- For example:
4025 -- package Pkg is
4026 -- type T is tagged private;
4027 -- type DT is new T with private;
4028 -- procedure Prim (X : in out T; Y : in out DT'Class);
4029 -- private
4030 -- type T is tagged null record;
4031 -- Obj : T;
4032 -- type DT is new T with null record;
4033 -- end;
4035 -- In this case the type will be frozen later by the usual
4036 -- mechanism: an object declaration, an instantiation, or the
4037 -- end of a declarative part.
4041 then
4045 -- Case of full view present
4049 -- If full view has already been frozen, then no further
4050 -- processing is required
4057 -- Otherwise freeze full view and patch the pointers so that
4058 -- the freeze node will elaborate both views in the back-end.
4060 else
4061 declare
4064 begin
4067 then
4068 Freeze_And_Append
4081 else
4082 -- {Incomplete,Private}_Subtypes with Full_Views
4083 -- constrained by discriminants.
4094 -- AI-117 requires that the convention of a partial view be the
4095 -- same as the convention of the full view. Note that this is a
4096 -- recognized breach of privacy, but it's essential for logical
4097 -- consistency of representation, and the lack of a rule in
4098 -- RM95 was an oversight.
4105 -- Size information is copied from the full view to the
4106 -- incomplete or private view for consistency.
4108 -- We skip this is the full view is not a type. This is very
4109 -- strange of course, and can only happen as a result of
4110 -- certain illegalities, such as a premature attempt to derive
4111 -- from an incomplete type.
4120 -- Case of no full view present. If entity is derived or subtype,
4121 -- it is safe to freeze, correctness depends on the frozen status
4122 -- of parent. Otherwise it is either premature usage, or a Taft
4123 -- amendment type, so diagnosis is at the point of use and the
4124 -- type might be frozen later.
4128 then
4131 else
4136 -- For access subprogram, freeze types of all formals, the return
4137 -- type was already frozen, since it is the Etype of the function.
4138 -- Formal types can be tagged Taft amendment types, but otherwise
4139 -- they cannot be incomplete.
4147 then
4151 -- AI05-151: Incomplete types are allowed in access to
4152 -- subprogram specifications.
4155 Error_Msg_NE
4166 -- For access to a protected subprogram, freeze the equivalent type
4167 -- (however this is not set if we are not generating code or if this
4168 -- is an anonymous type used just for resolution).
4176 -- Generic types are never seen by the back-end, and are also not
4177 -- processed by the expander (since the expander is turned off for
4178 -- generic processing), so we never need freeze nodes for them.
4184 -- Some special processing for non-generic types to complete
4185 -- representation details not known till the freeze point.
4190 -- Some error checks required for ordinary fixed-point type. Defer
4191 -- these till the freeze-point since we need the small and range
4192 -- values. We only do these checks for base types
4197 Error_Msg_N
4202 Error_Msg_N
4208 Error_Msg_N
4214 Error_Msg_N
4226 and then Warn_On_Suspicious_Modulus_Value
4227 then
4233 then
4234 -- If a pragma Default_Storage_Pool applies, and this type has no
4235 -- Storage_Pool or Storage_Size clause (which must have occurred
4236 -- before the freezing point), then use the default. This applies
4237 -- only to base types.
4239 -- None of this applies to access to subprograms, for which there
4240 -- are clearly no pools.
4246 then
4247 -- Case of pragma Default_Storage_Pool (null)
4252 -- Case of pragma Default_Storage_Pool (storage_pool_NAME)
4254 else
4259 -- Check restriction for standard storage pool
4265 -- Deal with error message for pure access type. This is not an
4266 -- error in Ada 2005 if there is no pool (see AI-366).
4271 then
4275 Error_Msg_N
4279 Error_Msg_N
4282 else
4283 Error_Msg_N
4290 -- Case of composite types
4294 -- AI-117 requires that all new primitives of a tagged type must
4295 -- inherit the convention of the full view of the type. Inherited
4296 -- and overriding operations are defined to inherit the convention
4297 -- of their parent or overridden subprogram (also specified in
4298 -- AI-117), which will have occurred earlier (in Derive_Subprogram
4299 -- and New_Overloaded_Entity). Here we set the convention of
4300 -- primitives that are still convention Ada, which will ensure
4301 -- that any new primitives inherit the type's convention. Class-
4302 -- wide types can have a foreign convention inherited from their
4303 -- specific type, but are excluded from this since they don't have
4304 -- any associated primitives.
4309 then
4310 declare
4314 begin
4326 -- If the type is a simple storage pool type, then this is where
4327 -- we attempt to locate and validate its Allocate, Deallocate, and
4328 -- Storage_Size operations (the first is required, and the latter
4329 -- two are optional). We also verify that the full type for a
4330 -- private type is allowed to be a simple storage pool type.
4334 then
4335 -- If the type is marked Has_Private_Declaration, then this is
4336 -- a full type for a private type that was specified with the
4337 -- pragma Simple_Storage_Pool_Type, and here we ensure that the
4338 -- pragma is allowed for the full type (for example, it can't
4339 -- be an array type, or a nonlimited record type).
4345 then
4347 Error_Msg_N
4358 procedure Validate_Simple_Pool_Op_Formal
4365 -- Validate one formal Pool_Op_Formal of the candidate pool
4366 -- operation Pool_Op. The formal must be of Expected_Type
4367 -- and have mode Expected_Mode. OK_Formal will be set to
4368 -- False if the formal doesn't match. If OK_Formal is False
4369 -- on entry, then the formal will effectively be ignored
4370 -- (because validation of the pool op has already failed).
4371 -- Upon return, Pool_Op_Formal will be updated to the next
4372 -- formal, if any.
4375 -- Search for and validate a simple pool operation with the
4376 -- name Op_Name. If the name is Allocate, then there must be
4377 -- exactly one such primitive operation for the simple pool
4378 -- type. If the name is Deallocate or Storage_Size, then
4379 -- there can be at most one such primitive operation. The
4380 -- profile of the located primitive must conform to what
4381 -- is expected for each operation.
4383 ------------------------------------
4384 -- Validate_Simple_Pool_Op_Formal --
4385 ------------------------------------
4387 procedure Validate_Simple_Pool_Op_Formal
4394 is
4395 begin
4396 -- If OK_Formal is False on entry, then simply ignore
4397 -- the formal, because an earlier formal has already
4398 -- been flagged.
4403 -- If no formal is passed in, then issue an error for a
4404 -- missing formal.
4407 Error_Msg_NE
4417 -- If the pool type was expected for this formal, then
4418 -- this will not be considered a candidate operation
4419 -- for the simple pool, so we unset OK_Formal so that
4420 -- the op and any later formals will be ignored.
4427 else
4428 Error_Msg_NE
4435 -- Issue error if formal's mode is not the expected one
4438 Error_Msg_N
4440 Pool_Op_Formal);
4443 -- Advance to the next formal
4448 ------------------------------------
4449 -- Validate_Simple_Pool_Operation --
4450 ------------------------------------
4452 procedure Validate_Simple_Pool_Operation
4454 is
4460 begin
4461 pragma Assert
4468 -- For each homonym declared immediately in the scope
4469 -- of the simple storage pool type, determine whether
4470 -- the homonym is an operation of the pool type, and,
4471 -- if so, check that its profile is as expected for
4472 -- a simple pool operation of that name.
4478 then
4483 -- The first parameter must be of the pool type
4484 -- in order for the operation to qualify.
4487 Validate_Simple_Pool_Op_Formal
4490 else
4491 Validate_Simple_Pool_Op_Formal
4496 -- If another operation with this name has already
4497 -- been located for the type, then flag an error,
4498 -- since we only allow the type to have a single
4499 -- such primitive.
4502 Error_Msg_NE
4507 -- In the case of Allocate and Deallocate, a formal
4508 -- of type System.Address is required.
4511 Validate_Simple_Pool_Op_Formal
4515 Validate_Simple_Pool_Op_Formal
4520 -- In the case of Allocate and Deallocate, formals
4521 -- of type Storage_Count are required as the third
4522 -- and fourth parameters.
4525 Validate_Simple_Pool_Op_Formal
4528 Validate_Simple_Pool_Op_Formal
4533 -- If no mismatched formals have been found (Is_OK)
4534 -- and no excess formals are present, then this
4535 -- operation has been validated, so record it.
4545 -- There must be a valid Allocate operation for the type,
4546 -- so issue an error if none was found.
4550 then
4556 -- Simple pool operations can't be abstract
4559 Error_Msg_N
4564 -- The Storage_Size operation must be a function with
4565 -- Storage_Count as its result type.
4569 Error_Msg_N
4573 Error_Msg_NE
4578 -- Allocate and Deallocate must be procedures
4581 Error_Msg_N
4587 -- Start of processing for Validate_Simple_Pool_Ops
4589 begin
4597 -- Now that all types from which E may depend are frozen, see if the
4598 -- size is known at compile time, if it must be unsigned, or if
4599 -- strict alignment is required
4608 -- Do not allow a size clause for a type which does not have a size
4609 -- that is known at compile time
4613 then
4614 -- Suppress this message if errors posted on E, even if we are
4615 -- in all errors mode, since this is often a junk message
4618 Error_Msg_N
4624 -- Now we set/verify the representation information, in particular
4625 -- the size and alignment values. This processing is not required for
4626 -- generic types, since generic types do not play any part in code
4627 -- generation, and so the size and alignment values for such types
4628 -- are irrelevant. Ditto for types declared within a generic unit,
4629 -- which may have components that depend on generic parameters, and
4630 -- that will be recreated in an instance.
4635 -- Otherwise we call the layout procedure
4637 else
4641 -- If this is an access to subprogram whose designated type is itself
4642 -- a subprogram type, the return type of this anonymous subprogram
4643 -- type must be decorated as well.
4647 then
4651 -- If the type has a Defaut_Value/Default_Component_Value aspect,
4652 -- this is where we analye the expression (after the type is frozen,
4653 -- since in the case of Default_Value, we are analyzing with the
4654 -- type itself, and we treat Default_Component_Value similarly for
4655 -- the sake of uniformity).
4658 declare
4663 begin
4668 else
4679 Flag_Non_Static_Expr
4686 -- End of freeze processing for type entities
4689 -- Here is where we logically freeze the current entity. If it has a
4690 -- freeze node, then this is the point at which the freeze node is
4691 -- linked into the result list.
4695 -- If a freeze node is already allocated, use it, otherwise allocate
4696 -- a new one. The preallocation happens in the case of anonymous base
4697 -- types, where we preallocate so that we can set First_Subtype_Link.
4698 -- Note that we reset the Sloc to the current freeze location.
4704 else
4715 -- A final pass over record types with discriminants. If the type
4716 -- has an incomplete declaration, there may be constrained access
4717 -- subtypes declared elsewhere, which do not depend on the discrimi-
4718 -- nants of the type, and which are used as component types (i.e.
4719 -- the full view is a recursive type). The designated types of these
4720 -- subtypes can only be elaborated after the type itself, and they
4721 -- need an itype reference.
4725 then
4726 declare
4731 begin
4741 then
4753 -- When a type is frozen, the first subtype of the type is frozen as
4754 -- well (RM 13.14(15)). This has to be done after freezing the type,
4755 -- since obviously the first subtype depends on its own base type.
4760 -- If we just froze a tagged non-class wide record, then freeze the
4761 -- corresponding class-wide type. This must be done after the tagged
4762 -- type itself is frozen, because the class-wide type refers to the
4763 -- tagged type which generates the class.
4768 then
4775 -- Special handling for subprograms
4779 -- If subprogram has address clause then reset Is_Public flag, since
4780 -- we do not want the backend to generate external references.
4784 then
4787 -- If no address clause and not intrinsic, then for imported
4788 -- subprogram in main unit, generate descriptor if we are in
4789 -- Propagate_Exceptions mode.
4791 -- This is very odd code, it makes a null result, why ???
4793 elsif Propagate_Exceptions
4797 then
4807 -----------------------------
4808 -- Freeze_Enumeration_Type --
4809 -----------------------------
4812 begin
4813 -- By default, if no size clause is present, an enumeration type with
4814 -- Convention C is assumed to interface to a C enum, and has integer
4815 -- size. This applies to types. For subtypes, verify that its base
4816 -- type has no size clause either. Treat other foreign conventions
4817 -- in the same way, and also make sure alignment is set right.
4823 then
4827 else
4828 -- If the enumeration type interfaces to C, and it has a size clause
4829 -- that specifies less than int size, it warrants a warning. The
4830 -- user may intend the C type to be an enum or a char, so this is
4831 -- not by itself an error that the Ada compiler can detect, but it
4832 -- it is a worth a heads-up. For Boolean and Character types we
4833 -- assume that the programmer has the proper C type in mind.
4840 then
4841 Error_Msg_N
4849 -----------------------
4850 -- Freeze_Expression --
4851 -----------------------
4862 -- This flag is set true if the entity must be frozen outside the
4863 -- current subprogram. This happens in the case of expander generated
4864 -- subprograms (_Init_Proc, _Input, _Output, _Read, _Write) which do
4865 -- not freeze all entities like other bodies, but which nevertheless
4866 -- may reference entities that have to be frozen before the body and
4867 -- obviously cannot be frozen inside the body.
4870 -- Given an N_Handled_Sequence_Of_Statements node N, determines whether
4871 -- it is the handled statement sequence of an expander-generated
4872 -- subprogram (init proc, stream subprogram, or renaming as body).
4873 -- If so, this is not a freezing context.
4875 -----------------
4876 -- In_Exp_Body --
4877 -----------------
4883 begin
4886 else
4893 else
4896 -- Following complex conditional could use comments ???
4905 N_Subprogram_Renaming_Declaration,
4906 N_Expression_Function))
4907 then
4909 else
4915 -- Start of processing for Freeze_Expression
4917 begin
4918 -- Immediate return if freezing is inhibited. This flag is set by the
4919 -- analyzer to stop freezing on generated expressions that would cause
4920 -- freezing if they were in the source program, but which are not
4921 -- supposed to freeze, since they are created.
4927 -- If expression is non-static, then it does not freeze in a default
4928 -- expression, see section "Handling of Default Expressions" in the
4929 -- spec of package Sem for further details. Note that we have to make
4930 -- sure that we actually have a real expression (if we have a subtype
4931 -- indication, we can't test Is_Static_Expression!) However, we exclude
4932 -- the case of the prefix of an attribute of a static scalar subtype
4933 -- from this early return, because static subtype attributes should
4934 -- always cause freezing, even in default expressions, but the attribute
4935 -- may not have been marked as static yet (because in Resolve_Attribute,
4936 -- the call to Eval_Attribute follows the call of Freeze_Expression on
4937 -- the prefix).
4939 if In_Spec_Exp
4946 then
4950 -- Freeze type of expression if not frozen already
4958 -- Base type may be an derived numeric type that is frozen at
4959 -- the point of declaration, but first_subtype is still unfrozen.
4966 -- For entity name, freeze entity if not frozen already. A special
4967 -- exception occurs for an identifier that did not come from source.
4968 -- We don't let such identifiers freeze a non-internal entity, i.e.
4969 -- an entity that did come from source, since such an identifier was
4970 -- generated by the expander, and cannot have any semantic effect on
4971 -- the freezing semantics. For example, this stops the parameter of
4972 -- an initialization procedure from freezing the variable.
4979 then
4981 else
4985 -- For an allocator freeze designated type if not frozen already
4987 -- For an aggregate whose component type is an access type, freeze the
4988 -- designated type now, so that its freeze does not appear within the
4989 -- loop that might be created in the expansion of the aggregate. If the
4990 -- designated type is a private type without full view, the expression
4991 -- cannot contain an allocator, so the type is not frozen.
4993 -- For a function, we freeze the entity when the subprogram declaration
4994 -- is frozen, but a function call may appear in an initialization proc.
4995 -- before the declaration is frozen. We need to generate the extra
4996 -- formals, if any, to ensure that the expansion of the call includes
4997 -- the proper actuals. This only applies to Ada subprograms, not to
4998 -- imported ones.
5009 then
5013 when N_Selected_Component |
5014 N_Indexed_Component |
5015 N_Slice =>
5026 then
5037 then
5041 -- All done if nothing needs freezing
5046 then
5050 -- Loop for looking at the right place to insert the freeze nodes,
5051 -- exiting from the loop when it is appropriate to insert the freeze
5052 -- node before the current node P.
5054 -- Also checks some special exceptions to the freezing rules. These
5055 -- cases result in a direct return, bypassing the freeze action.
5058 loop
5061 -- If we don't have a parent, then we are not in a well-formed tree.
5062 -- This is an unusual case, but there are some legitimate situations
5063 -- in which this occurs, notably when the expressions in the range of
5064 -- a type declaration are resolved. We simply ignore the freeze
5065 -- request in this case. Is this right ???
5071 -- See if we have got to an appropriate point in the tree
5075 -- A special test for the exception of (RM 13.14(8)) for the case
5076 -- of per-object expressions (RM 3.8(18)) occurring in component
5077 -- definition or a discrete subtype definition. Note that we test
5078 -- for a component declaration which includes both cases we are
5079 -- interested in, and furthermore the tree does not have explicit
5080 -- nodes for either of these two constructs.
5084 -- The case we want to test for here is an identifier that is
5085 -- a per-object expression, this is either a discriminant that
5086 -- appears in a context other than the component declaration
5087 -- or it is a reference to the type of the enclosing construct.
5089 -- For either of these cases, we skip the freezing
5091 if not In_Spec_Expression
5094 then
5095 -- We recognize the discriminant case by just looking for
5096 -- a reference to a discriminant. It can only be one for
5097 -- the enclosing construct. Skip freezing in this case.
5102 -- For the case of a reference to the enclosing record,
5103 -- (or task or protected type), we look for a type that
5104 -- matches the current scope.
5111 -- If we have an enumeration literal that appears as the choice in
5112 -- the aggregate of an enumeration representation clause, then
5113 -- freezing does not occur (RM 13.14(10)).
5117 -- The case we are looking for is an enumeration literal
5121 then
5122 -- If enumeration literal appears directly as the choice,
5123 -- do not freeze (this is the normal non-overloaded case)
5127 then
5130 -- If enumeration literal appears as the name of function
5131 -- which is the choice, then also do not freeze. This
5132 -- happens in the overloaded literal case, where the
5133 -- enumeration literal is temporarily changed to a function
5134 -- call for overloading analysis purposes.
5137 and then
5139 and then
5141 then
5146 -- Normally if the parent is a handled sequence of statements,
5147 -- then the current node must be a statement, and that is an
5148 -- appropriate place to insert a freeze node.
5152 -- An exception occurs when the sequence of statements is for
5153 -- an expander generated body that did not do the usual freeze
5154 -- all operation. In this case we usually want to freeze
5155 -- outside this body, not inside it, and we skip past the
5156 -- subprogram body that we are inside.
5159 declare
5163 begin
5164 -- Freeze the entity only when it is declared inside the
5165 -- body of the expander generated procedure. This case
5166 -- is recognized by the scope of the entity or its type,
5167 -- which is either the spec for some enclosing body, or
5168 -- (in the case of init_procs, for which there are no
5169 -- separate specs) the current scope.
5175 or else
5177 then
5183 then
5188 -- An expression function may act as a completion of
5189 -- a function declaration. As such, it can reference
5190 -- entities declared between the two views:
5192 -- Hidden []; -- 1
5193 -- function F return ...;
5194 -- private
5195 -- function Hidden return ...;
5196 -- function F return ... is (Hidden); -- 2
5198 -- Refering to the example above, freezing the expression
5199 -- of F (2) would place Hidden's freeze node (1) in the
5200 -- wrong place. Avoid explicit freezing and let the usual
5201 -- scenarios do the job - for example, reaching the end
5202 -- of the private declarations.
5205 N_Expression_Function
5206 then
5209 -- Freeze outside the body
5211 else
5217 -- Here if normal case where we are in handled statement
5218 -- sequence and want to do the insertion right there.
5220 else
5224 -- If parent is a body or a spec or a block, then the current node
5225 -- is a statement or declaration and we can insert the freeze node
5226 -- before it.
5228 when N_Block_Statement |
5229 N_Entry_Body |
5230 N_Package_Body |
5231 N_Package_Specification |
5232 N_Protected_Body |
5233 N_Subprogram_Body |
5236 -- The expander is allowed to define types in any statements list,
5237 -- so any of the following parent nodes also mark a freezing point
5238 -- if the actual node is in a list of statements or declarations.
5240 when N_Abortable_Part |
5241 N_Accept_Alternative |
5242 N_And_Then |
5243 N_Case_Statement_Alternative |
5244 N_Compilation_Unit_Aux |
5245 N_Conditional_Entry_Call |
5246 N_Delay_Alternative |
5247 N_Elsif_Part |
5248 N_Entry_Call_Alternative |
5249 N_Exception_Handler |
5250 N_Extended_Return_Statement |
5251 N_Freeze_Entity |
5252 N_If_Statement |
5253 N_Or_Else |
5254 N_Selective_Accept |
5255 N_Triggering_Alternative =>
5259 -- Note: The N_Loop_Statement is a special case. A type that
5260 -- appears in the source can never be frozen in a loop (this
5261 -- occurs only because of a loop expanded by the expander), so we
5262 -- keep on going. Otherwise we terminate the search. Same is true
5263 -- of any entity which comes from source. (if they have predefined
5264 -- type, that type does not appear to come from source, but the
5265 -- entity should not be frozen here).
5271 -- For all other cases, keep looking at parents
5277 -- We fall through the case if we did not yet find the proper
5278 -- place in the free for inserting the freeze node, so climb!
5283 -- If the expression appears in a record or an initialization procedure,
5284 -- the freeze nodes are collected and attached to the current scope, to
5285 -- be inserted and analyzed on exit from the scope, to insure that
5286 -- generated entities appear in the correct scope. If the expression is
5287 -- a default for a discriminant specification, the scope is still void.
5288 -- The expression can also appear in the discriminant part of a private
5289 -- or concurrent type.
5291 -- If the expression appears in a constrained subcomponent of an
5292 -- enclosing record declaration, the freeze nodes must be attached to
5293 -- the outer record type so they can eventually be placed in the
5294 -- enclosing declaration list.
5296 -- The other case requiring this special handling is if we are in a
5297 -- default expression, since in that case we are about to freeze a
5298 -- static type, and the freeze scope needs to be the outer scope, not
5299 -- the scope of the subprogram with the default parameter.
5301 -- For default expressions and other spec expressions in generic units,
5302 -- the Move_Freeze_Nodes mechanism (see sem_ch12.adb) takes care of
5303 -- placing them at the proper place, after the generic unit.
5306 or else Freeze_Outside
5311 then
5312 declare
5317 begin
5330 -- The current scope may be that of a constrained component of
5331 -- an enclosing record declaration, or of a loop of an enclosing
5332 -- quantified expression, which is above the current scope in the
5333 -- scope stack. Indeed in the context of a quantified expression,
5334 -- a scope is created and pushed above the current scope in order
5335 -- to emulate the loop-like behavior of the quantified expression.
5336 -- If the expression is within a top-level pragma, as for a pre-
5337 -- condition on a library-level subprogram, nothing to do.
5342 N_Quantified_Expression)
5343 then
5350 Freeze_Nodes;
5351 else
5361 -- Now we have the right place to do the freezing. First, a special
5362 -- adjustment, if we are in spec-expression analysis mode, these freeze
5363 -- actions must not be thrown away (normally all inserted actions are
5364 -- thrown away in this mode. However, the freeze actions are from static
5365 -- expressions and one of the important reasons we are doing this
5366 -- special analysis is to get these freeze actions. Therefore we turn
5367 -- off the In_Spec_Expression mode to propagate these freeze actions.
5368 -- This also means they get properly analyzed and expanded.
5372 -- Freeze the designated type of an allocator (RM 13.14(13))
5378 -- Freeze type of expression (RM 13.14(10)). Note that we took care of
5379 -- the enumeration representation clause exception in the loop above.
5385 -- Freeze name if one is present (RM 13.14(11))
5391 -- Restore In_Spec_Expression flag
5396 -----------------------------
5397 -- Freeze_Fixed_Point_Type --
5398 -----------------------------
5400 -- Certain fixed-point types and subtypes, including implicit base types
5401 -- and declared first subtypes, have not yet set up a range. This is
5402 -- because the range cannot be set until the Small and Size values are
5403 -- known, and these are not known till the type is frozen.
5405 -- To signal this case, Scalar_Range contains an unanalyzed syntactic range
5406 -- whose bounds are unanalyzed real literals. This routine will recognize
5407 -- this case, and transform this range node into a properly typed range
5408 -- with properly analyzed and resolved values.
5426 -- Returns size of type with given bounds. Also leaves these
5427 -- bounds set as the current bounds of the Typ.
5429 -----------
5430 -- Fsize --
5431 -----------
5434 begin
5440 -- Start of processing for Freeze_Fixed_Point_Type
5442 begin
5443 -- If Esize of a subtype has not previously been set, set it now
5450 else
5455 -- Immediate return if the range is already analyzed. This means that
5456 -- the range is already set, and does not need to be computed by this
5457 -- routine.
5463 -- Immediate return if either of the bounds raises Constraint_Error
5467 then
5474 -- Ordinary fixed-point case
5478 -- For the ordinary fixed-point case, we are allowed to fudge the
5479 -- end-points up or down by small. Generally we prefer to fudge up,
5480 -- i.e. widen the bounds for non-model numbers so that the end points
5481 -- are included. However there are cases in which this cannot be
5482 -- done, and indeed cases in which we may need to narrow the bounds.
5483 -- The following circuit makes the decision.
5485 -- Note: our terminology here is that Incl_EP means that the bounds
5486 -- are widened by Small if necessary to include the end points, and
5487 -- Excl_EP means that the bounds are narrowed by Small to exclude the
5488 -- end-points if this reduces the size.
5490 -- Note that in the Incl case, all we care about is including the
5491 -- end-points. In the Excl case, we want to narrow the bounds as
5492 -- much as permitted by the RM, to give the smallest possible size.
5509 begin
5510 -- First step. Base types are required to be symmetrical. Right
5511 -- now, the base type range is a copy of the first subtype range.
5512 -- This will be corrected before we are done, but right away we
5513 -- need to deal with the case where both bounds are non-negative.
5514 -- In this case, we set the low bound to the negative of the high
5515 -- bound, to make sure that the size is computed to include the
5516 -- required sign. Note that we do not need to worry about the
5517 -- case of both bounds negative, because the sign will be dealt
5518 -- with anyway. Furthermore we can't just go making such a bound
5519 -- symmetrical, since in a twos-complement system, there is an
5520 -- extra negative value which could not be accommodated on the
5521 -- positive side.
5526 then
5531 -- Compute the fudged bounds. If the number is a model number,
5532 -- then we do nothing to include it, but we are allowed to backoff
5533 -- to the next adjacent model number when we exclude it. If it is
5534 -- not a model number then we straddle the two values with the
5535 -- model numbers on either side.
5541 else
5545 -- The low value excluding the end point is Small greater, but
5546 -- we do not do this exclusion if the low value is positive,
5547 -- since it can't help the size and could actually hurt by
5548 -- crossing the high bound.
5553 -- If the value went from negative to zero, then we have the
5554 -- case where Loval_Incl_EP is the model number just below
5555 -- zero, so we want to stick to the negative value for the
5556 -- base type to maintain the condition that the size will
5557 -- include signed values.
5561 then
5565 else
5569 -- Similar processing for upper bound and high value
5575 else
5581 else
5585 -- One further adjustment is needed. In the case of subtypes, we
5586 -- cannot go outside the range of the base type, or we get
5587 -- peculiarities, and the base type range is already set. This
5588 -- only applies to the Incl values, since clearly the Excl values
5589 -- are already as restricted as they are allowed to be.
5596 -- Get size including and excluding end points
5601 -- No need to exclude end-points if it does not reduce size
5611 -- Now we set the actual size to be used. We want to use the
5612 -- bounds fudged up to include the end-points but only if this
5613 -- can be done without violating a specifically given size
5614 -- size clause or causing an unacceptable increase in size.
5616 -- Case of size clause given
5620 -- Use the inclusive size only if it is consistent with
5621 -- the explicitly specified size.
5628 -- If the inclusive size is too large, we try excluding
5629 -- the end-points (will be caught later if does not work).
5631 else
5637 -- Case of size clause not given
5639 else
5640 -- If we have a base type whose corresponding first subtype
5641 -- has an explicit size that is large enough to include our
5642 -- end-points, then do so. There is no point in working hard
5643 -- to get a base type whose size is smaller than the specified
5644 -- size of the first subtype.
5650 then
5655 -- If excluding the end-points makes the size smaller and
5656 -- results in a size of 8,16,32,64, then we take the smaller
5657 -- size. For the 64 case, this is compulsory. For the other
5658 -- cases, it seems reasonable. We like to include end points
5659 -- if we can, but not at the expense of moving to the next
5660 -- natural boundary of size.
5664 then
5669 -- Otherwise we can definitely include the end points
5671 else
5677 -- One pathological case: normally we never fudge a low bound
5678 -- down, since it would seem to increase the size (if it has
5679 -- any effect), but for ranges containing single value, or no
5680 -- values, the high bound can be small too large. Consider:
5682 -- type t is delta 2.0**(-14)
5683 -- range 131072.0 .. 0;
5685 -- That lower bound is *just* outside the range of 32 bits, and
5686 -- does need fudging down in this case. Note that the bounds
5687 -- will always have crossed here, since the high bound will be
5688 -- fudged down if necessary, as in the case of:
5690 -- type t is delta 2.0**(-14)
5691 -- range 131072.0 .. 131072.0;
5693 -- So we detect the situation by looking for crossed bounds,
5694 -- and if the bounds are crossed, and the low bound is greater
5695 -- than zero, we will always back it off by small, since this
5696 -- is completely harmless.
5703 -- And of course, we need to do exactly the same parallel
5704 -- fudge for flat ranges in the negative region.
5717 -- For the decimal case, none of this fudging is required, since there
5718 -- are no end-point problems in the decimal case (the end-points are
5719 -- always included).
5721 else
5725 -- At this stage, the actual size has been calculated and the proper
5726 -- required bounds are stored in the low and high bounds.
5730 Error_Msg_N
5732 Typ);
5736 -- Check size against explicit given size
5742 Error_Msg_NE
5746 else
5750 -- Increase size to next natural boundary if no size clause given
5752 else
5759 else
5767 -- If we have a base type, then expand the bounds so that they extend to
5768 -- the full width of the allocated size in bits, to avoid junk range
5769 -- checks on intermediate computations.
5776 -- Final step is to reanalyze the bounds using the proper type
5777 -- and set the Corresponding_Integer_Value fields of the literals.
5783 -- Resolve with universal fixed if the base type, and the base type if
5784 -- it is a subtype. Note we can't resolve the base type with itself,
5785 -- that would be a reference before definition.
5789 else
5793 -- Set corresponding integer value for bound
5795 Set_Corresponding_Integer_Value
5798 -- Similar processing for high bound
5806 else
5810 Set_Corresponding_Integer_Value
5813 -- Set type of range to correspond to bounds
5817 -- Set Esize to calculated size if not set already
5823 -- Set RM_Size if not already set. If already set, check value
5825 declare
5828 begin
5833 Error_Msg_NE
5838 else
5844 ------------------
5845 -- Freeze_Itype --
5846 ------------------
5851 begin
5860 --------------------------
5861 -- Freeze_Static_Object --
5862 --------------------------
5867 -- Exception raised if the type of a static object cannot be made
5868 -- static. This happens if the type depends on non-global objects.
5871 -- Called to ensure that an expression used as part of a type definition
5872 -- is statically allocatable, which means that the expression type is
5873 -- statically allocatable, and the expression is either static, or a
5874 -- reference to a library level constant.
5877 -- Called to mark a type as static, checking that it is possible
5878 -- to set the type as static. If it is not possible, then the
5879 -- exception Cannot_Be_Static is raised.
5881 -----------------------------
5882 -- Ensure_Expression_Is_SA --
5883 -----------------------------
5888 begin
5900 then
5908 -----------------------
5909 -- Ensure_Type_Is_SA --
5910 -----------------------
5916 begin
5917 -- If type is library level, we are all set
5923 -- We are also OK if the type already marked as statically allocated,
5924 -- which means we processed it before.
5930 -- Mark type as statically allocated
5934 -- Check that it is safe to statically allocate this type
5952 declare
5956 begin
5968 else
5977 then
5996 else
6001 -- Start of processing for Freeze_Static_Object
6003 begin
6006 exception
6009 -- If the object that cannot be static is imported or exported, then
6010 -- issue an error message saying that this object cannot be imported
6011 -- or exported. If it has an address clause it is an overlay in the
6012 -- current partition and the static requirement is not relevant.
6013 -- Do not issue any error message when ignoring rep clauses.
6020 Error_Msg_N
6024 -- Otherwise must be exported, something is wrong if compiler
6025 -- is marking something as statically allocated which cannot be).
6028 Error_Msg_N
6033 -----------------------
6034 -- Freeze_Subprogram --
6035 -----------------------
6041 begin
6042 -- Subprogram may not have an address clause unless it is imported
6046 Error_Msg_N
6053 -- Reset the Pure indication on an imported subprogram unless an
6054 -- explicit Pure_Function pragma was present. We do this because
6055 -- otherwise it is an insidious error to call a non-pure function from
6056 -- pure unit and have calls mysteriously optimized away. What happens
6057 -- here is that the Import can bypass the normal check to ensure that
6058 -- pure units call only pure subprograms.
6063 then
6067 -- For non-foreign convention subprograms, this is where we create
6068 -- the extra formals (for accessibility level and constrained bit
6069 -- information). We delay this till the freeze point precisely so
6070 -- that we know the convention!
6076 -- If this is convention Ada and a Valued_Procedure, that's odd
6081 and then Warn_On_Export_Import
6082 then
6083 Error_Msg_N
6088 -- Case of foreign convention
6090 else
6093 -- For foreign conventions, warn about return of an
6094 -- unconstrained array.
6096 -- Note: we *do* allow a return by descriptor for the VMS case,
6097 -- though here there is probably more to be done ???
6102 -- If no return type, probably some other error, e.g. a
6103 -- missing full declaration, so ignore.
6108 -- If the return type is generic, we have emitted a warning
6109 -- earlier on, and there is nothing else to check here. Specific
6110 -- instantiations may lead to erroneous behavior.
6115 -- Display warning if returning unconstrained array
6120 -- Exclude cases where descriptor mechanism is set, since the
6121 -- VMS descriptor mechanisms allow such unconstrained returns.
6125 -- Check appropriate warning is enabled (should we check for
6126 -- Warnings (Off) on specific entities here, probably so???)
6128 and then Warn_On_Export_Import
6130 -- Exclude the VM case, since return of unconstrained arrays
6131 -- is properly handled in both the JVM and .NET cases.
6134 then
6135 Error_Msg_N
6142 -- If any of the formals for an exported foreign convention
6143 -- subprogram have defaults, then emit an appropriate warning since
6144 -- this is odd (default cannot be used from non-Ada code)
6149 if Warn_On_Export_Import
6151 then
6152 Error_Msg_N
6162 -- For VMS, descriptor mechanisms for parameters are allowed only for
6163 -- imported/exported subprograms. Moreover, the NCA descriptor is not
6164 -- allowed for parameters of exported subprograms.
6171 Error_Msg_N
6173 Error_Msg_N
6184 Error_Msg_N
6186 Error_Msg_N
6195 -- Pragma Inline_Always is disallowed for dispatching subprograms
6196 -- because the address of such subprograms is saved in the dispatch
6197 -- table to support dispatching calls, and dispatching calls cannot
6198 -- be inlined. This is consistent with the restriction against using
6199 -- 'Access or 'Address on an Inline_Always subprogram.
6203 then
6204 Error_Msg_N
6208 -- Because of the implicit representation of inherited predefined
6209 -- operators in the front-end, the overriding status of the operation
6210 -- may be affected when a full view of a type is analyzed, and this is
6211 -- not captured by the analysis of the corresponding type declaration.
6212 -- Therefore the correctness of a not-overriding indicator must be
6213 -- rechecked when the subprogram is frozen.
6217 then
6222 ----------------------
6223 -- Is_Fully_Defined --
6224 ----------------------
6227 begin
6236 then
6237 -- Verify that the record type has no components with private types
6238 -- without completion.
6240 declare
6243 begin
6255 -- For the designated type of an access to subprogram, all types in
6256 -- the profile must be fully defined.
6259 declare
6262 begin
6275 else
6281 ---------------------------------
6282 -- Process_Default_Expressions --
6283 ---------------------------------
6285 procedure Process_Default_Expressions
6288 is
6295 begin
6298 -- A subprogram instance and its associated anonymous subprogram share
6299 -- their signature. The default expression functions are defined in the
6300 -- wrapper packages for the anonymous subprogram, and should not be
6301 -- generated again for the instance.
6306 then
6314 -- We work with a copy of the default expression because we
6315 -- do not want to disturb the original, since this would mess
6316 -- up the conformance checking.
6320 -- The analysis of the expression may generate insert actions,
6321 -- which of course must not be executed. We wrap those actions
6322 -- in a procedure that is not called, and later on eliminated.
6323 -- The following cases have no side-effects, and are analyzed
6324 -- directly.
6335 and then
6337 then
6339 -- If there is no default function, we must still do a full
6340 -- analyze call on the default value, to ensure that all error
6341 -- checks are performed, e.g. those associated with static
6342 -- evaluation. Note: this branch will always be taken if the
6343 -- analyzer is turned off (but we still need the error checks).
6345 -- Note: the setting of parent here is to meet the requirement
6346 -- that we can only analyze the expression while attached to
6347 -- the tree. Really the requirement is that the parent chain
6348 -- be set, we don't actually need to be in the tree.
6353 -- Default expressions are resolved with their own type if the
6354 -- context is generic, to avoid anomalies with private types.
6358 else
6362 -- If that resolved expression will raise constraint error,
6363 -- then flag the default value as raising constraint error.
6364 -- This allows a proper error message on the calls.
6370 -- If the default is a parameterless call, we use the name of
6371 -- the called function directly, and there is no body to build.
6375 then
6378 -- Else construct and analyze the body of a wrapper procedure
6379 -- that contains an object declaration to hold the expression.
6380 -- Given that this is done only to complete the analysis, it
6381 -- simpler to build a procedure than a function which might
6382 -- involve secondary stack expansion.
6384 else
6387 Dbody :=
6389 Specification =>
6396 Object_Definition =>
6400 Handled_Statement_Sequence =>
6417 ----------------------------------------
6418 -- Set_Component_Alignment_If_Not_Set --
6419 ----------------------------------------
6422 begin
6423 -- Ignore if not base type, subtypes don't need anything
6429 -- Do not override existing representation
6440 else
6441 Set_Component_Alignment
6447 ------------------
6448 -- Undelay_Type --
6449 ------------------
6452 begin
6456 -- Since we don't want T to have a Freeze_Node, we don't want its
6457 -- Full_View or Corresponding_Record_Type to have one either.
6459 -- ??? Fundamentally, this whole handling is a kludge. What we really
6460 -- want is to be sure that for an Itype that's part of record R and is a
6461 -- subtype of type T, that it's frozen after the later of the freeze
6462 -- points of R and T. We have no way of doing that directly, so what we
6463 -- do is force most such Itypes to be frozen as part of freezing R via
6464 -- this procedure and only delay the ones that need to be delayed
6465 -- (mostly the designated types of access types that are defined as part
6466 -- of the record).
6472 then
6480 then
6485 ------------------
6486 -- Warn_Overlay --
6487 ------------------
6489 procedure Warn_Overlay
6493 is
6495 -- The object to which the address clause applies
6501 begin
6502 -- No warning if address clause overlay warnings are off
6508 -- No warning if there is an explicit initialization
6516 -- We only give the warning for non-imported entities of a type for
6517 -- which a non-null base init proc is defined, or for objects of access
6518 -- types with implicit null initialization, or when Normalize_Scalars
6519 -- applies and the type is scalar or a string type (the latter being
6520 -- tested for because predefined String types are initialized by inline
6521 -- code rather than by an init_proc). Note that we do not give the
6522 -- warning for Initialize_Scalars, since we suppressed initialization
6523 -- in this case. Also, do not warn if Suppress_Initialization is set.
6533 then
6536 then
6541 then
6548 then
6555 -- A function call (most likely to To_Address) is probably not an
6556 -- overlay, so skip warning. Ditto if the function call was inlined
6557 -- and transformed into an entity.
6565 -- If a pragma Import follows, we assume that it is for the current
6566 -- target of the address clause, and skip the warning.
6571 then
6577 Error_Msg_N
6579 Nam);
6580 else
6581 Error_Msg_N
6583 Nam);
6586 -- Add friendly warning if initialization comes from a packed array
6587 -- component.
6590 declare
6593 begin
6598 then
6602 then
6603 Error_Msg_NE
6608 else
6615 Error_Msg_N
6618 Nam);