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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) 1992-2007, 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 2, 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 COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
21 -- --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 -- --
25 ------------------------------------------------------------------------------
66 -----------------------
67 -- Local Subprograms --
68 -----------------------
71 -- Typ is a type that is being frozen. If no size clause is given,
72 -- but a default Esize has been computed, then this default Esize is
73 -- adjusted up if necessary to be consistent with a given alignment,
74 -- but never to a value greater than Long_Long_Integer'Size. This
75 -- is used for all discrete types and for fixed-point types.
77 procedure Build_And_Analyze_Renamed_Body
81 -- Build body for a renaming declaration, insert in tree and analyze
84 -- Apply legality checks to address clauses for object declarations,
85 -- at the point the object is frozen.
88 -- E is a base type. If E is tagged or has a component that is aliased
89 -- or tagged or contains something this is aliased or tagged, set
90 -- Strict_Alignment.
94 -- If E is a fixed-point or discrete type, then all the necessary work
95 -- to freeze it is completed except for possible setting of the flag
96 -- Is_Unsigned_Type, which is done by this procedure. The call has no
97 -- effect if the entity E is not a discrete or fixed-point type.
99 procedure Freeze_And_Append
103 -- Freezes Ent using Freeze_Entity, and appends the resulting list of
104 -- nodes to Result, modifying Result from No_List if necessary.
107 -- Freeze enumeration type. The Esize field is set as processing
108 -- proceeds (i.e. set by default when the type is declared and then
109 -- adjusted by rep clauses. What this procedure does is to make sure
110 -- that if a foreign convention is specified, and no specific size
111 -- is given, then the size must be at least Integer'Size.
114 -- If an object is frozen which has Is_Statically_Allocated set, then
115 -- all referenced types must also be marked with this flag. This routine
116 -- is in charge of meeting this requirement for the object entity E.
119 -- Perform freezing actions for a subprogram (create extra formals,
120 -- and set proper default mechanism values). Note that this routine
121 -- is not called for internal subprograms, for which neither of these
122 -- actions is needed (or desirable, we do not want for example to have
123 -- these extra formals present in initialization procedures, where they
124 -- would serve no purpose). In this call E is either a subprogram or
125 -- a subprogram type (i.e. an access to a subprogram).
128 -- True if T is not private and has no private components, or has a full
129 -- view. Used to determine whether the designated type of an access type
130 -- should be frozen when the access type is frozen. This is done when an
131 -- allocator is frozen, or an expression that may involve attributes of
132 -- the designated type. Otherwise freezing the access type does not freeze
133 -- the designated type.
135 procedure Process_Default_Expressions
138 -- This procedure is called for each subprogram to complete processing
139 -- of default expressions at the point where all types are known to be
140 -- frozen. The expressions must be analyzed in full, to make sure that
141 -- all error processing is done (they have only been pre-analyzed). If
142 -- the expression is not an entity or literal, its analysis may generate
143 -- code which must not be executed. In that case we build a function
144 -- body to hold that code. This wrapper function serves no other purpose
145 -- (it used to be called to evaluate the default, but now the default is
146 -- inlined at each point of call).
149 -- Typ is a record or array type that is being frozen. This routine
150 -- sets the default component alignment from the scope stack values
151 -- if the alignment is otherwise not specified.
154 -- As each entity is frozen, this routine is called to deal with the
155 -- setting of Debug_Info_Needed for the entity. This flag is set if
156 -- the entity comes from source, or if we are in Debug_Generated_Code
157 -- mode or if the -gnatdV debug flag is set. However, it never sets
158 -- the flag if Debug_Info_Off is set.
161 -- Sets the Debug_Info_Needed flag on entity T if not already set, and
162 -- also on any entities that are needed by T (for an object, the type
163 -- of the object is needed, and for a type, the subsidiary types are
164 -- needed -- see body for details). Never has any effect on T if the
165 -- Debug_Info_Off flag is set.
168 -- T is a type of a component that we know to be an Itype.
169 -- We don't want this to have a Freeze_Node, so ensure it doesn't.
170 -- Do the same for any Full_View or Corresponding_Record_Type.
172 procedure Warn_Overlay
176 -- Expr is the expression for an address clause for entity Nam whose type
177 -- is Typ. If Typ has a default initialization, and there is no explicit
178 -- initialization in the source declaration, check whether the address
179 -- clause might cause overlaying of an entity, and emit a warning on the
180 -- side effect that the initialization will cause.
182 -------------------------------
183 -- Adjust_Esize_For_Alignment --
184 -------------------------------
189 begin
195 then
201 ------------------------------------
202 -- Build_And_Analyze_Renamed_Body --
203 ------------------------------------
205 procedure Build_And_Analyze_Renamed_Body
209 is
211 begin
218 ------------------------
219 -- Build_Renamed_Body --
220 ------------------------
222 function Build_Renamed_Body
225 is
227 -- We use for the source location of the renamed body, the location
228 -- of the spec entity. It might seem more natural to use the location
229 -- of the renaming declaration itself, but that would be wrong, since
230 -- then the body we create would look as though it was created far
231 -- too late, and this could cause problems with elaboration order
232 -- analysis, particularly in connection with instantiations.
247 -- If the renamed entity is a primitive operation given in prefix form,
248 -- the prefix is the target object and it has to be added as the first
249 -- actual in the generated call.
251 begin
252 -- Determine the entity being renamed, which is the target of the call
253 -- statement. If the name is an explicit dereference, this is a renaming
254 -- of a subprogram type rather than a subprogram. The name itself is
255 -- fully analyzed.
266 else
273 else
279 -- If the renamed entity is a predefined operator, retain full name
280 -- to ensure its visibility.
284 then
286 else
290 else
293 and then
296 then
298 -- Retrieve the target object, to be added as a first actual
299 -- in the call.
304 else
308 -- The original name may have been overloaded, but
309 -- is fully resolved now.
314 -- For simple renamings, subsequent calls can be expanded directly as
315 -- called to the renamed entity. The body must be generated in any case
316 -- for calls they may appear elsewhere.
321 then
325 -- The body generated for this renaming is an internal artifact, and
326 -- does not constitute a freeze point for the called entity.
333 declare
337 begin
339 -- The controlling formal may be an access parameter, or the
340 -- actual may be an access value, so ajust accordingly.
344 then
345 Actuals := New_List
350 then
351 Actuals := New_List
355 else
363 else
374 -- If the renamed entity is an entry, inherit its profile. For other
375 -- renamings as bodies, both profiles must be subtype conformant, so it
376 -- is not necessary to replace the profile given in the declaration.
377 -- However, default values that are aggregates are rewritten when
378 -- partially analyzed, so we recover the original aggregate to insure
379 -- that subsequent conformity checking works. Similarly, if the default
380 -- expression was constant-folded, recover the original expression.
392 N_Access_Definition
393 then
401 then
412 -- If the renamed entity is a function, the generated body contains a
413 -- return statement. Otherwise, build a procedure call. If the entity is
414 -- an entry, subsequent analysis of the call will transform it into the
415 -- proper entry or protected operation call. If the renamed entity is
416 -- a character literal, return it directly.
422 then
423 Call_Node :=
425 Expression =>
431 Call_Node :=
436 Call_Node :=
440 else
441 Call_Node :=
447 -- Create entities for subprogram body and formals
461 Body_Node :=
465 Handled_Statement_Sequence =>
475 -- Link the body to the entity whose declaration it completes. If
476 -- the body is analyzed when the renamed entity is frozen, it may
477 -- be necessary to restore the proper scope (see package Exp_Ch13).
481 then
483 else
490 --------------------------
491 -- Check_Address_Clause --
492 --------------------------
500 begin
504 -- If we have no initialization of any kind, then we don't need to
505 -- place any restrictions on the address clause, because the object
506 -- will be elaborated after the address clause is evaluated. This
507 -- happens if the declaration has no initial expression, or the type
508 -- has no implicit initialization, or the object is imported.
510 -- The same holds for all initialized scalar types and all access
511 -- types. Packed bit arrays of size up to 64 are represented using a
512 -- modular type with an initialization (to zero) and can be processed
513 -- like other initialized scalar types.
515 -- If the type is controlled, code to attach the object to a
516 -- finalization chain is generated at the point of declaration,
517 -- and therefore the elaboration of the object cannot be delayed:
518 -- the address expression must be a constant.
522 and then
526 or else
530 or else
533 or else
535 and then
537 then
540 -- Otherwise, we require the address clause to be constant because
541 -- the call to the initialization procedure (or the attach code) has
542 -- to happen at the point of the declaration.
544 else
551 then
557 -----------------------------
558 -- Check_Compile_Time_Size --
559 -----------------------------
564 -- Sets the compile time known size (32 bits or less) in the Esize
565 -- field, of T checking for a size clause that was given which attempts
566 -- to give a smaller size.
569 -- Recursive function that does all the work
572 -- If T is a constrained subtype, its size is not known if any of its
573 -- discriminant constraints is not static and it is not a null record.
574 -- The test is conservative and doesn't check that the components are
575 -- in fact constrained by non-static discriminant values. Could be made
576 -- more precise ???
578 --------------------
579 -- Set_Small_Size --
580 --------------------
583 begin
590 Error_Msg_NE
598 -- Set sizes if not set already
600 else
611 ----------------
612 -- Size_Known --
613 ----------------
622 begin
628 then
640 -- Don't do any recursion on type with error posted, since we may
641 -- have a malformed type that leads us into a loop.
650 -- Check for all indexes static, and also compute possible size
651 -- (in case it is less than 32 and may be packable).
653 declare
657 begin
666 else
674 then
677 else
682 else
700 then
701 -- Don't do any recursion on type with error posted, since we may
702 -- have a malformed type that leads us into a loop.
706 else
712 -- A class-wide type is never considered to have a known size
717 -- A subtype of a variant record must not have non-static
718 -- discriminanted components.
722 then
725 -- Don't do any recursion on type with error posted, since we may
726 -- have a malformed type that leads us into a loop.
732 -- Now look at the components of the record
734 declare
735 -- The following two variables are used to keep track of the
736 -- size of packed records if we can tell the size of the packed
737 -- record in the front end. Packed_Size_Known is True if so far
738 -- we can figure out the size. It is initialized to True for a
739 -- packed record, unless the record has discriminants. The
740 -- reason we eliminate the discriminated case is that we don't
741 -- know the way the back end lays out discriminated packed
742 -- records. If Packed_Size_Known is True, then Packed_Size is
743 -- the size in bits so far.
751 begin
752 -- Test for variant part present
758 N_Record_Definition
762 then
763 -- If variant part is present, and type is unconstrained,
764 -- then we must have defaulted discriminants, or a size
765 -- clause must be present for the type, or else the size
766 -- is definitely not known at compile time.
769 and then
770 No (Discriminant_Default_Value
773 then
778 -- Loop through components
784 -- We do not know the packed size if there is a component
785 -- clause present (we possibly could, but this would only
786 -- help in the case of a record with partial rep clauses.
787 -- That's because in the case of full rep clauses, the
788 -- size gets figured out anyway by a different circuit).
794 -- We need to identify a component that is an array where
795 -- the index type is an enumeration type with non-standard
796 -- representation, and some bound of the type depends on a
797 -- discriminant.
799 -- This is because gigi computes the size by doing a
800 -- substituation of the appropriate discriminant value in
801 -- the size expression for the base type, and gigi is not
802 -- clever enough to evaluate the resulting expression (which
803 -- involves a call to rep_to_pos) at compile time.
805 -- It would be nice if gigi would either recognize that
806 -- this expression can be computed at compile time, or
807 -- alternatively figured out the size from the subtype
808 -- directly, where all the information is at hand ???
812 then
813 declare
821 begin
828 then
834 then
839 then
849 -- Clearly size of record is not known if the size of one of
850 -- the components is not known.
856 -- Accumulate packed size if possible
860 -- We can only deal with elementary types, since for
861 -- non-elementary components, alignment enters into the
862 -- picture, and we don't know enough to handle proper
863 -- alignment in this context. Packed arrays count as
864 -- elementary if the representation is a modular type.
869 and then Is_Modular_Integer_Type
871 then
872 -- If RM_Size is known and static, then we can
873 -- keep accumulating the packed size.
877 -- A little glitch, to be removed sometime ???
878 -- gigi does not understand zero sizes yet.
883 -- Normal case where we can keep accumulating the
884 -- packed array size.
886 else
890 -- If we have a field whose RM_Size is not known then
891 -- we can't figure out the packed size here.
893 else
897 -- If we have a non-elementary type we can't figure out
898 -- the packed array size (alignment issues).
900 else
915 else
920 -------------------------------------
921 -- Static_Discriminated_Components --
922 -------------------------------------
924 function Static_Discriminated_Components
926 is
929 begin
933 then
947 -- Start of processing for Check_Compile_Time_Size
949 begin
953 -----------------------------
954 -- Check_Debug_Info_Needed --
955 -----------------------------
958 begin
963 or else Debug_Generated_Code
964 or else Debug_Flag_VV
965 then
970 ----------------------------
971 -- Check_Strict_Alignment --
972 ----------------------------
977 begin
996 then
1006 -------------------------
1007 -- Check_Unsigned_Type --
1008 -------------------------
1015 begin
1020 -- Do not attempt to analyze case where range was in error
1026 -- The situation that is non trivial is something like
1028 -- subtype x1 is integer range -10 .. +10;
1029 -- subtype x2 is x1 range 0 .. V1;
1030 -- subtype x3 is x2 range V2 .. V3;
1031 -- subtype x4 is x3 range V4 .. V5;
1033 -- where Vn are variables. Here the base type is signed, but we still
1034 -- know that x4 is unsigned because of the lower bound of x2.
1036 -- The only way to deal with this is to look up the ancestor chain
1039 loop
1054 else
1057 -- If no ancestor had a static lower bound, go to base type
1061 -- Note: the reason we still check for a compile time known
1062 -- value for the base type is that at least in the case of
1063 -- generic formals, we can have bounds that fail this test,
1064 -- and there may be other cases in error situations.
1076 then
1086 -----------------------------
1087 -- Expand_Atomic_Aggregate --
1088 -----------------------------
1095 begin
1100 then
1101 Temp :=
1105 New_N :=
1115 -- To prevent the temporary from being constant-folded (which would
1116 -- lead to the same piecemeal assignment on the original target)
1117 -- indicate to the back-end that the temporary is a variable with
1118 -- real storage. See description of this flag in Einfo, and the notes
1119 -- on N_Assignment_Statement and N_Object_Declaration in Sinfo.
1125 ----------------
1126 -- Freeze_All --
1127 ----------------
1129 -- Note: the easy coding for this procedure would be to just build a
1130 -- single list of freeze nodes and then insert them and analyze them
1131 -- all at once. This won't work, because the analysis of earlier freeze
1132 -- nodes may recursively freeze types which would otherwise appear later
1133 -- on in the freeze list. So we must analyze and expand the freeze nodes
1134 -- as they are generated.
1142 -- This is the internal recursive routine that does freezing of entities
1143 -- (but NOT the analysis of default expressions, which should not be
1144 -- recursive, we don't want to analyze those till we are sure that ALL
1145 -- the types are frozen).
1147 --------------------
1148 -- Freeze_All_Ent --
1149 --------------------
1151 procedure Freeze_All_Ent
1154 is
1160 -- If freeze nodes are present, insert and analyze, and reset cursor
1161 -- for next insertion.
1163 -------------------
1164 -- Process_Flist --
1165 -------------------
1168 begin
1175 else
1181 -- Start or processing for Freeze_All_Ent
1183 begin
1187 -- If the entity is an inner package which is not a package
1188 -- renaming, then its entities must be frozen at this point. Note
1189 -- that such entities do NOT get frozen at the end of the nested
1190 -- package itself (only library packages freeze).
1192 -- Same is true for task declarations, where anonymous records
1193 -- created for entry parameters must be frozen.
1199 then
1209 and then
1211 or else
1213 then
1216 End_Scope;
1218 -- For a derived tagged type, we must ensure that all the
1219 -- primitive operations of the parent have been frozen, so that
1220 -- their addresses will be in the parent's dispatch table at the
1221 -- point it is inherited.
1227 then
1228 declare
1235 begin
1243 then
1245 Process_Flist;
1255 Process_Flist;
1258 -- If an incomplete type is still not frozen, this may be a
1259 -- premature freezing because of a body declaration that follows.
1260 -- Indicate where the freezing took place.
1262 -- If the freezing is caused by the end of the current declarative
1263 -- part, it is a Taft Amendment type, and there is no error.
1267 then
1268 declare
1271 begin
1278 and then
1280 then
1282 Error_Msg_NE
1293 -- Start of processing for Freeze_All
1295 begin
1298 -- Now that all types are frozen, we can deal with default expressions
1299 -- that require us to build a default expression functions. This is the
1300 -- point at which such functions are constructed (after all types that
1301 -- might be used in such expressions have been frozen).
1303 -- We also add finalization chains to access types whose designated
1304 -- types are controlled. This is normally done when freezing the type,
1305 -- but this misses recursive type definitions where the later members
1306 -- of the recursion introduce controlled components (e.g. 5624-001).
1308 -- Loop through entities
1326 and then
1328 = N_Subprogram_Renaming_Declaration
1329 then
1330 Build_And_Analyze_Renamed_Body
1336 and then
1338 or else
1340 then
1341 declare
1343 begin
1350 then
1363 then
1371 -----------------------
1372 -- Freeze_And_Append --
1373 -----------------------
1375 procedure Freeze_And_Append
1379 is
1381 begin
1385 else
1391 -------------------
1392 -- Freeze_Before --
1393 -------------------
1397 begin
1403 -------------------
1404 -- Freeze_Entity --
1405 -------------------
1417 -- Check that an Access or Unchecked_Access attribute with a prefix
1418 -- which is the current instance type can only be applied when the type
1419 -- is limited.
1422 -- If Loc is a freeze_entity that appears after the last declaration
1423 -- in the scope, inhibit error messages on late completion.
1426 -- Freeze each component, handle some representation clauses, and freeze
1427 -- primitive operations if this is a tagged type.
1429 ----------------------------
1430 -- After_Last_Declaration --
1431 ----------------------------
1435 begin
1441 else
1444 else
1449 ----------------------------
1450 -- Check_Current_Instance --
1451 ----------------------------
1461 -- Process routine to apply check to given node
1463 -------------
1464 -- Process --
1465 -------------
1468 begin
1472 or else
1477 then
1478 Error_Msg_N
1481 else
1491 -- Start of processing for Check_Current_Instance
1493 begin
1494 -- In Ada95, the (imprecise) rule is that the current instance of a
1495 -- limited type is aliased. In Ada2005, limitedness must be explicit:
1496 -- either a tagged type, or a limited record.
1499 and then
1502 then
1507 then
1510 else
1515 ------------------------
1516 -- Freeze_Record_Type --
1517 ------------------------
1529 -- Set True if we find at least one component with no component
1530 -- clause (used to warn about useless Pack pragmas).
1533 -- Set True if we find at least one component with a component
1534 -- clause (used to warn about useless Bit_Order pragmas).
1537 -- If N is an allocator, possibly wrapped in one or more level of
1538 -- qualified expression(s), return the inner allocator node, else
1539 -- return Empty.
1542 -- If the component subtype is an access to a constrained subtype of
1543 -- an already frozen type, make the subtype frozen as well. It might
1544 -- otherwise be frozen in the wrong scope, and a freeze node on
1545 -- subtype has no effect. Similarly, if the component subtype is a
1546 -- regular (not protected) access to subprogram, set the anonymous
1547 -- subprogram type to frozen as well, to prevent an out-of-scope
1548 -- freeze node at some eventual point of call. Protected operations
1549 -- are handled elsewhere.
1551 ---------------------
1552 -- Check_Allocator --
1553 ---------------------
1557 begin
1559 loop
1564 else
1570 -----------------
1571 -- Check_Itype --
1572 -----------------
1577 begin
1580 then
1583 -- In addition, add an Itype_Reference to ensure that the
1584 -- access subtype is elaborated early enough. This cannot be
1585 -- done if the subtype may depend on discriminants.
1590 then
1596 else
1603 then
1608 -- Start of processing for Freeze_Record_Type
1610 begin
1611 -- If this is a subtype of a controlled type, declared without a
1612 -- constraint, the _controller may not appear in the component list
1613 -- if the parent was not frozen at the point of subtype declaration.
1614 -- Inherit the _controller component now.
1618 then
1621 then
1624 -- If this is an internal type without a declaration, as for
1625 -- record component, the base type may not yet be frozen, and its
1626 -- controller has not been created. Add an explicit freeze node
1627 -- for the itype, so it will be frozen after the base type. This
1628 -- freeze node is used to communicate with the expander, in order
1629 -- to create the controller for the enclosing record, and it is
1630 -- deleted afterwards (see exp_ch3). It must not be created when
1631 -- expansion is off, because it might appear in the wrong context
1632 -- for the back end.
1636 and then
1638 N_Component_Declaration
1639 and then Expander_Active
1640 then
1645 -- Freeze components and embedded subtypes
1651 -- First handle the (real) component case
1655 then
1656 declare
1659 begin
1660 -- Freezing a record type freezes the type of each of its
1661 -- components. However, if the type of the component is
1662 -- part of this record, we do not want or need a separate
1663 -- Freeze_Node. Note that Is_Itype is wrong because that's
1664 -- also set in private type cases. We also can't check for
1665 -- the Scope being exactly Rec because of private types and
1666 -- record extensions.
1671 then
1677 -- Check for error of component clause given for variable
1678 -- sized type. We have to delay this test till this point,
1679 -- since the component type has to be frozen for us to know
1680 -- if it is variable length. We omit this test in a generic
1681 -- context, it will be applied at instantiation time.
1689 elsif not
1690 Size_Known_At_Compile_Time
1692 then
1693 Error_Msg_N
1698 else
1702 -- Case of component requires byte alignment
1706 -- Set the enclosing record to also require byte align
1710 -- Check for component clause that is inconsistent with
1711 -- the required byte boundary alignment.
1716 then
1717 Error_Msg_N
1723 -- If component clause is present, then deal with the non-
1724 -- default bit order case for Ada 95 mode. The required
1725 -- processing for Ada 2005 mode is handled separately after
1726 -- processing all components.
1728 -- We only do this processing for the base type, and in
1729 -- fact that's important, since otherwise if there are
1730 -- record subtypes, we could reverse the bits once for
1731 -- each subtype, which would be incorrect.
1737 then
1738 declare
1751 begin
1752 -- Cases where field goes over storage unit boundary
1756 -- Allow multi-byte field but generate warning
1760 then
1761 Error_Msg_N
1766 Error_Msg_N
1769 else
1770 Error_Msg_N
1775 -- Do not allow non-contiguous field
1777 else
1778 Error_Msg_N
1781 Error_Msg_N
1786 -- Case where field fits in one storage unit
1788 else
1789 -- Give warning if suspicious component clause
1792 and then Warn_On_Reverse_Bit_Order
1793 then
1794 Error_Msg_N
1797 Error_Msg_Uint_1 :=
1799 System_Storage_Unit;
1800 Error_Msg_N
1805 -- Here is where we fix up the Component_Bit_Offset
1806 -- value to account for the reverse bit order.
1807 -- Some examples of what needs to be done are:
1809 -- First_Bit .. Last_Bit Component_Bit_Offset
1810 -- old new old new
1812 -- 0 .. 0 7 .. 7 0 7
1813 -- 0 .. 1 6 .. 7 0 6
1814 -- 0 .. 2 5 .. 7 0 5
1815 -- 0 .. 7 0 .. 7 0 4
1817 -- 1 .. 1 6 .. 6 1 6
1818 -- 1 .. 4 3 .. 6 1 3
1819 -- 4 .. 7 0 .. 3 4 0
1821 -- The general rule is that the first bit is
1822 -- is obtained by subtracting the old ending bit
1823 -- from storage_unit - 1.
1825 Set_Component_Bit_Offset
1831 Set_Normalized_First_Bit
1834 System_Storage_Unit);
1841 -- If the component is an Itype with Delayed_Freeze and is either
1842 -- a record or array subtype and its base type has not yet been
1843 -- frozen, we must remove this from the entity list of this
1844 -- record and put it on the entity list of the scope of its base
1845 -- type. Note that we know that this is not the type of a
1846 -- component since we cleared Has_Delayed_Freeze for it in the
1847 -- previous loop. Thus this must be the Designated_Type of an
1848 -- access type, which is the type of a component.
1856 then
1857 declare
1861 begin
1862 -- We have a pretty bad kludge here. Suppose Rec is subtype
1863 -- being defined in a subprogram that's created as part of
1864 -- the freezing of Rec'Base. In that case, we know that
1865 -- Comp'Base must have already been frozen by the time we
1866 -- get to elaborate this because Gigi doesn't elaborate any
1867 -- bodies until it has elaborated all of the declarative
1868 -- part. But Is_Frozen will not be set at this point because
1869 -- we are processing code in lexical order.
1871 -- We detect this case by going up the Scope chain of Rec
1872 -- and seeing if we have a subprogram scope before reaching
1873 -- the top of the scope chain or that of Comp'Base. If we
1874 -- do, then mark that Comp'Base will actually be frozen. If
1875 -- so, we merely undelay it.
1890 else
1893 else
1897 -- Insert in entity list of scope of base type (which
1898 -- must be an enclosing scope, because still unfrozen).
1904 -- If the component is an access type with an allocator as default
1905 -- value, the designated type will be frozen by the corresponding
1906 -- expression in init_proc. In order to place the freeze node for
1907 -- the designated type before that for the current record type,
1908 -- freeze it now.
1910 -- Same process if the component is an array of access types,
1911 -- initialized with an aggregate. If the designated type is
1912 -- private, it cannot contain allocators, and it is premature
1913 -- to freeze the type, so we check for this as well.
1918 then
1919 declare
1923 begin
1926 -- If component is pointer to a classwide type, freeze
1927 -- the specific type in the expression being allocated.
1928 -- The expression may be a subtype indication, in which
1929 -- case freeze the subtype mark.
1931 if Is_Class_Wide_Type
1933 then
1935 Freeze_And_Append
1937 elsif
1939 then
1940 Freeze_And_Append
1948 else
1949 Freeze_And_Append
1957 then
1966 and then Is_Fully_Defined
1968 then
1969 Freeze_And_Append
1970 (Designated_Type
1978 -- Deal with pragma Bit_Order
1982 ADC :=
1984 Error_Msg_N
1986 Error_Msg_N
1989 -- Here is where we do Ada 2005 processing for bit order (the Ada
1990 -- 95 case was already taken care of above).
1997 -- Check for useless pragma Pack when all components placed. We only
1998 -- do this check for record types, not subtypes, since a subtype may
1999 -- have all its components placed, and it still makes perfectly good
2000 -- sense to pack other subtypes or the parent type.
2004 and then not Unplaced_Component
2005 then
2006 -- Reset packed status. Probably not necessary, but we do it so
2007 -- that there is no chance of the back end doing something strange
2008 -- with this redundant indication of packing.
2012 -- Give warning if redundant constructs warnings on
2015 Error_Msg_N
2021 -- If this is the record corresponding to a remote type, freeze the
2022 -- remote type here since that is what we are semantically freezing.
2023 -- This prevents the freeze node for that type in an inner scope.
2025 -- Also, Check for controlled components and unchecked unions.
2026 -- Finally, enforce the restriction that access attributes with a
2027 -- current instance prefix can only apply to limited types.
2031 Freeze_And_Append
2041 and then Present
2043 and then Has_Controlled_Component
2045 then
2056 -- Scan component declaration for likely misuses of current
2057 -- instance, either in a constraint or a default expression.
2068 -- For first subtypes, check if there are any fixed-point fields with
2069 -- component clauses, where we must check the size. This is not done
2070 -- till the freeze point, since for fixed-point types, we do not know
2071 -- the size until the type is frozen. Similar processing applies to
2072 -- bit packed arrays.
2080 or else
2082 then
2083 Check_Size
2087 Junk);
2094 -- Generate warning for applying C or C++ convention to a record
2095 -- with discriminants. This is suppressed for the unchecked union
2096 -- case, since the whole point in this case is interface C.
2103 or else
2106 then
2107 declare
2111 begin
2116 Error_Msg_N
2118 else
2119 Error_Msg_N
2123 Error_Msg_NE
2130 -- Start of processing for Freeze_Entity
2132 begin
2133 -- We are going to test for various reasons why this entity need not be
2134 -- frozen here, but in the case of an Itype that's defined within a
2135 -- record, that test actually applies to the record.
2141 then
2145 -- Do not freeze if already frozen since we only need one freeze node
2150 -- It is improper to freeze an external entity within a generic because
2151 -- its freeze node will appear in a non-valid context. The entity will
2152 -- be frozen in the proper scope after the current generic is analyzed.
2157 -- Do not freeze a global entity within an inner scope created during
2158 -- expansion. A call to subprogram E within some internal procedure
2159 -- (a stream attribute for example) might require freezing E, but the
2160 -- freeze node must appear in the same declarative part as E itself.
2161 -- The two-pass elaboration mechanism in gigi guarantees that E will
2162 -- be frozen before the inner call is elaborated. We exclude constants
2163 -- from this test, because deferred constants may be frozen early, and
2164 -- must be diagnosed (e.g. in the case of a deferred constant being used
2165 -- in a default expression). If the enclosing subprogram comes from
2166 -- source, or is a generic instance, then the freeze point is the one
2167 -- mandated by the language, and we freeze the entity. A subprogram that
2168 -- is a child unit body that acts as a spec does not have a spec that
2169 -- comes from source, but can only come from source.
2174 then
2175 declare
2178 begin
2184 then
2186 else
2195 -- Similarly, an inlined instance body may make reference to global
2196 -- entities, but these references cannot be the proper freezing point
2197 -- for them, and in the absence of inlining freezing will take place in
2198 -- their own scope. Normally instance bodies are analyzed after the
2199 -- enclosing compilation, and everything has been frozen at the proper
2200 -- place, but with front-end inlining an instance body is compiled
2201 -- before the end of the enclosing scope, and as a result out-of-order
2202 -- freezing must be prevented.
2204 elsif Front_End_Inlining
2205 and then In_Instance_Body
2207 then
2208 declare
2211 begin
2215 else
2226 -- Here to freeze the entity
2231 -- Case of entity being frozen is other than a type
2235 -- If entity is exported or imported and does not have an external
2236 -- name, now is the time to provide the appropriate default name.
2237 -- Skip this if the entity is stubbed, since we don't need a name
2238 -- for any stubbed routine.
2243 then
2244 Set_Encoded_Interface_Name
2247 -- Special processing for atomic objects appearing in object decls
2252 then
2253 declare
2256 begin
2257 -- If expression is an aggregate, assign to a temporary to
2258 -- ensure that the actual assignment is done atomically rather
2259 -- than component-wise (the assignment to the temp may be done
2260 -- component-wise, but that is harmless).
2265 -- If the expression is a reference to a record or array object
2266 -- entity, then reset Is_True_Constant to False so that the
2267 -- compiler will not optimize away the intermediate object,
2268 -- which we need in this case for the same reason (to ensure
2269 -- that the actual assignment is atomic, rather than
2270 -- component-wise).
2274 or else
2276 then
2282 -- For a subprogram, freeze all parameter types and also the return
2283 -- type (RM 13.14(14)). However skip this for internal subprograms.
2284 -- This is also the point where any extra formal parameters are
2285 -- created since we now know whether the subprogram will use
2286 -- a foreign convention.
2290 declare
2295 begin
2296 -- Loop through formals
2308 then
2309 -- If the type of a formal is incomplete, subprogram
2310 -- is being frozen prematurely. Within an instance
2311 -- (but not within a wrapper package) this is an
2312 -- an artifact of our need to regard the end of an
2313 -- instantiation as a freeze point. Otherwise it is
2314 -- a definite error.
2316 -- and then not Is_Wrapper_Package (Current_Scope) ???
2322 elsif not After_Last_Declaration
2323 and then not Freezing_Library_Level_Tagged_Type
2324 then
2326 Error_Msg
2328 Loc);
2332 -- Check suspicious parameter for C function. These tests
2333 -- apply only to exported/imported suboprograms.
2335 if Warn_On_Export_Import
2337 or else
2343 then
2346 -- Check suspicious use of fat C pointer
2350 then
2351 Error_Msg_N
2355 -- Check suspicious return of boolean
2359 then
2360 Error_Msg_N
2364 -- Check suspicious tagged type
2368 and then
2369 Is_Tagged_Type
2372 then
2373 Error_Msg_N
2377 -- Check wrong convention subprogram pointer
2381 then
2382 Error_Msg_N
2386 Error_Msg_NE
2394 -- Check for unconstrained array in exported foreign
2395 -- convention case.
2401 and then Warn_On_Export_Import
2402 then
2405 -- If this is an inherited operation, place the
2406 -- warning on the derived type declaration, rather
2407 -- than on the original subprogram.
2410 N_Full_Type_Declaration
2411 then
2415 Error_Msg_NE
2418 else
2422 Error_Msg_NE
2425 Error_Msg_NE
2431 -- Ada 2005 (AI-326): Check wrong use of tag incomplete
2432 -- types with unknown discriminants. For example:
2434 -- type T (<>) is tagged;
2435 -- procedure P (X : access T); -- ERROR
2436 -- procedure P (X : T); -- ERROR
2447 and then Unknown_Discriminants_Present
2450 then
2451 Error_Msg_N
2455 -- If the formal is an anonymous_access_to_subprogram
2456 -- freeze the subprogram type as well, to prevent
2457 -- scope anomalies in gigi, because there is no other
2458 -- clear point at which it could be frozen.
2462 then
2470 -- Case of function
2474 -- Freeze return type
2479 -- Check suspicious return type for C function
2481 if Warn_On_Export_Import
2483 or else
2488 then
2489 -- Check suspicious return of fat C pointer
2493 then
2494 Error_Msg_N
2498 -- Check suspicious return of boolean
2502 then
2503 Error_Msg_N
2507 -- Check suspicious return tagged type
2511 and then
2512 Is_Tagged_Type
2515 then
2516 Error_Msg_N
2520 -- Check return of wrong convention subprogram pointer
2524 then
2525 Error_Msg_N
2529 Error_Msg_NE
2539 and then Warn_On_Export_Import
2540 then
2541 Error_Msg_N
2545 -- Ada 2005 (AI-326): Check wrong use of tagged
2546 -- incomplete type
2547 --
2548 -- type T is tagged;
2549 -- function F (X : Boolean) return T; -- ERROR
2555 then
2556 Error_Msg_N
2558 E);
2564 -- Must freeze its parent first if it is a derived subprogram
2570 -- We don't freeze internal subprograms, because we don't normally
2571 -- want addition of extra formals or mechanism setting to happen
2572 -- for those. However we do pass through predefined dispatching
2573 -- cases, since extra formals may be needed in some cases, such as
2574 -- for the stream 'Input function (build-in-place formals).
2578 then
2582 -- Here for other than a subprogram or type
2584 else
2585 -- If entity has a type, and it is not a generic unit, then
2586 -- freeze it first (RM 13.14(10)).
2590 then
2594 -- Special processing for objects created by object declaration
2598 -- For object created by object declaration, perform required
2599 -- categorization (preelaborate and pure) checks. Defer these
2600 -- checks to freeze time since pragma Import inhibits default
2601 -- initialization and thus pragma Import affects these checks.
2605 -- If there is an address clause, check it is valid
2609 -- For imported objects, set Is_Public unless there is also an
2610 -- address clause, which means that there is no external symbol
2611 -- needed for the Import (Is_Public may still be set for other
2612 -- unrelated reasons). Note that we delayed this processing
2613 -- till freeze time so that we can be sure not to set the flag
2614 -- if there is an address clause. If there is such a clause,
2615 -- then the only purpose of the Import pragma is to suppress
2616 -- implicit initialization.
2620 then
2624 -- For convention C objects of an enumeration type, warn if
2625 -- the size is not integer size and no explicit size given.
2626 -- Skip warning for Boolean, and Character, assume programmer
2627 -- expects 8-bit sizes for these cases.
2630 or else
2637 then
2639 Error_Msg_N
2641 E);
2646 -- Check that a constant which has a pragma Volatile[_Components]
2647 -- or Atomic[_Components] also has a pragma Import (RM C.6(13)).
2649 -- Note: Atomic[_Components] also sets Volatile[_Components]
2654 then
2655 -- Make sure we actually have a pragma, and have not merely
2656 -- inherited the indication from elsewhere (e.g. an address
2657 -- clause, which is not good enough in RM terms!)
2660 or else
2662 then
2663 Error_Msg_N
2668 or else
2670 then
2671 Error_Msg_N
2677 -- Static objects require special handling
2681 then
2685 -- Remaining step is to layout objects
2688 or else
2690 or else
2692 or else
2694 then
2699 -- Case of a type or subtype being frozen
2701 else
2702 -- We used to check here that a full type must have preelaborable
2703 -- initialization if it completes a private type specified with
2704 -- pragma Preelaborable_Intialization, but that missed cases where
2705 -- the types occur within a generic package, since the freezing
2706 -- that occurs within a containing scope generally skips traversal
2707 -- of a generic unit's declarations (those will be frozen within
2708 -- instances). This check was moved to Analyze_Package_Specification.
2710 -- The type may be defined in a generic unit. This can occur when
2711 -- freezing a generic function that returns the type (which is
2712 -- defined in a parent unit). It is clearly meaningless to freeze
2713 -- this type. However, if it is a subtype, its size may be determi-
2714 -- nable and used in subsequent checks, so might as well try to
2715 -- compute it.
2719 then
2724 -- Deal with special cases of freezing for subtype
2728 -- Before we do anything else, a specialized test for the case of
2729 -- a size given for an array where the array needs to be packed,
2730 -- but was not so the size cannot be honored. This would of course
2731 -- be caught by the backend, and indeed we don't catch all cases.
2732 -- The point is that we can give a better error message in those
2733 -- cases that we do catch with the circuitry here. Also if pragma
2734 -- Implicit_Packing is set, this is where the packing occurs.
2736 -- The reason we do this so early is that the processing in the
2737 -- automatic packing case affects the layout of the base type, so
2738 -- it must be done before we freeze the base type.
2741 declare
2745 begin
2746 -- Check enabling conditions. These are straightforward
2747 -- except for the test for a limited composite type. This
2748 -- eliminates the rare case of a array of limited components
2749 -- where there are issues of whether or not we can go ahead
2750 -- and pack the array (since we can't freely pack and unpack
2751 -- arrays if they are limited).
2753 -- Note that we check the root type explicitly because the
2754 -- whole point is we are doing this test before we have had
2755 -- a chance to freeze the base type (and it is that freeze
2756 -- action that causes stuff to be inherited).
2768 then
2775 then
2776 declare
2786 -- What we are looking for here is the situation where
2787 -- the RM_Size given would be exactly right if there
2788 -- was a pragma Pack (resulting in the component size
2789 -- being the same as the RM_Size). Furthermore, the
2790 -- component type size must be an odd size (not a
2791 -- multiple of storage unit)
2793 begin
2796 then
2797 -- For implicit packing mode, just set the
2798 -- component size silently
2806 -- Otherwise give an error message
2808 else
2809 Error_Msg_NE
2811 Error_Msg_N
2822 -- If ancestor subtype present, freeze that first. Note that this
2823 -- will also get the base type frozen.
2830 -- Otherwise freeze the base type of the entity before freezing
2831 -- the entity itself (RM 13.14(15)).
2837 -- For a derived type, freeze its parent type first (RM 13.14(15))
2844 -- For array type, freeze index types and component type first
2845 -- before freezing the array (RM 13.14(15)).
2848 declare
2852 -- Set true if any of the index types is an enumeration type
2853 -- with a non-standard representation.
2855 begin
2864 then
2871 -- Processing that is done only for base types
2875 -- Propagate flags for component type
2879 then
2887 -- If packing was requested or if the component size was set
2888 -- explicitly, then see if bit packing is required. This
2889 -- processing is only done for base types, since all the
2890 -- representation aspects involved are type-related. This
2891 -- is not just an optimization, if we start processing the
2892 -- subtypes, they intefere with the settings on the base
2893 -- type (this is because Is_Packed has a slightly different
2894 -- meaning before and after freezing).
2896 declare
2900 begin
2904 then
2913 else
2916 -- We can set the component size if it is less than
2917 -- 16, rounding it up to the next storage unit size.
2923 else
2927 -- Set component size up to match alignment if it
2928 -- would otherwise be less than the alignment. This
2929 -- deals with cases of types whose alignment exceeds
2930 -- their size (padded types).
2933 declare
2935 begin
2943 -- Case of component size that may result in packing
2946 declare
2952 Get_Attribute_Definition_Clause
2954 begin
2955 -- Warn if we have pack and component size so that
2956 -- the pack is ignored.
2958 -- Note: here we must check for the presence of a
2959 -- component size before checking for a Pack pragma
2960 -- to deal with the case where the array type is a
2961 -- derived type whose parent is currently private.
2965 then
2967 Error_Msg_NE
2970 Error_Msg_N
2972 Pack_Pragma);
2975 -- Set component size if not already set by a
2976 -- component size clause.
2982 -- Check for base type of 8, 16, 32 bits, where an
2983 -- unsigned subtype has a length one less than the
2984 -- base type (e.g. Natural subtype of Integer).
2986 -- In such cases, if a component size was not set
2987 -- explicitly, then generate a warning.
2991 and then
2994 then
2998 Error_Msg_N
3001 Error_Msg_N
3007 -- Actual packing is not needed for 8, 16, 32, 64.
3008 -- Also not needed for 24 if alignment is 1.
3015 then
3016 -- Here the array was requested to be packed,
3017 -- but the packing request had no effect, so
3018 -- Is_Packed is reset.
3020 -- Note: semantically this means that we lose
3021 -- track of the fact that a derived type
3022 -- inherited a pragma Pack that was non-
3023 -- effective, but that seems fine.
3025 -- We regard a Pack pragma as a request to set
3026 -- a representation characteristic, and this
3027 -- request may be ignored.
3031 -- In all other cases, packing is indeed needed
3033 else
3042 -- Processing that is done only for subtypes
3044 else
3045 -- Acquire alignment from base type
3053 -- For bit-packed arrays, check the size
3057 then
3058 declare
3064 begin
3065 -- It is not clear if it is possible to have no size
3066 -- clause at this stage, but it is not worth worrying
3067 -- about. Post error on the entity name in the size
3068 -- clause if present, else on the type entity itself.
3072 else
3078 -- If any of the index types was an enumeration type with
3079 -- a non-standard rep clause, then we indicate that the
3080 -- array type is always packed (even if it is not bit packed).
3089 -- If the array is packed, we must create the packed array
3090 -- type to be used to actually implement the type. This is
3091 -- only needed for real array types (not for string literal
3092 -- types, since they are present only for the front end).
3096 then
3100 -- Size information of packed array type is copied to the
3101 -- array type, since this is really the representation. But
3102 -- do not override explicit existing size values. If the
3103 -- ancestor subtype is constrained the packed_array_type
3104 -- will be inherited from it, but the size may have been
3105 -- provided already, and must not be overridden either.
3108 and then
3111 then
3121 -- For non-packed arrays set the alignment of the array to the
3122 -- alignment of the component type if it is unknown. Skip this
3123 -- in atomic case (atomic arrays may need larger alignments).
3132 then
3137 -- For a class-wide type, the corresponding specific type is
3138 -- frozen as well (RM 13.14(15))
3143 -- If the base type of the class-wide type is still incomplete,
3144 -- the class-wide remains unfrozen as well. This is legal when
3145 -- E is the formal of a primitive operation of some other type
3146 -- which is being frozen.
3153 -- If the Class_Wide_Type is an Itype (when type is the anonymous
3154 -- parent of a derived type) and it is a library-level entity,
3155 -- generate an itype reference for it. Otherwise, its first
3156 -- explicit reference may be in an inner scope, which will be
3157 -- rejected by the back-end.
3161 then
3162 declare
3165 begin
3169 else
3175 -- The equivalent type associated with a class-wide subtype needs
3176 -- to be frozen to ensure that its layout is done. Class-wide
3177 -- subtypes are currently only frozen on targets requiring
3178 -- front-end layout (see New_Class_Wide_Subtype and
3179 -- Make_CW_Equivalent_Type in exp_util.adb).
3183 then
3187 -- For a record (sub)type, freeze all the component types (RM
3188 -- 13.14(15). We test for E_Record_(sub)Type here, rather than using
3189 -- Is_Record_Type, because we don't want to attempt the freeze for
3190 -- the case of a private type with record extension (we will do that
3191 -- later when the full type is frozen).
3195 then
3198 -- For a concurrent type, freeze corresponding record type. This
3199 -- does not correpond to any specific rule in the RM, but the
3200 -- record type is essentially part of the concurrent type.
3201 -- Freeze as well all local entities. This includes record types
3202 -- created for entry parameter blocks, and whatever local entities
3203 -- may appear in the private part.
3207 Freeze_And_Append
3220 then
3230 -- Private types are required to point to the same freeze node as
3231 -- their corresponding full views. The freeze node itself has to
3232 -- point to the partial view of the entity (because from the partial
3233 -- view, we can retrieve the full view, but not the reverse).
3234 -- However, in order to freeze correctly, we need to freeze the full
3235 -- view. If we are freezing at the end of a scope (or within the
3236 -- scope of the private type), the partial and full views will have
3237 -- been swapped, the full view appears first in the entity chain and
3238 -- the swapping mechanism ensures that the pointers are properly set
3239 -- (on scope exit).
3241 -- If we encounter the partial view before the full view (e.g. when
3242 -- freezing from another scope), we freeze the full view, and then
3243 -- set the pointers appropriately since we cannot rely on swapping to
3244 -- fix things up (subtypes in an outer scope might not get swapped).
3248 then
3249 -- The construction of the dispatch table associated with library
3250 -- level tagged types forces freezing of all the primitives of the
3251 -- type, which may cause premature freezing of the partial view.
3252 -- For example:
3254 -- package Pkg is
3255 -- type T is tagged private;
3256 -- type DT is new T with private;
3257 -- procedure Prim (X : in out T; Y : in out DT'class);
3258 -- private
3259 -- type T is tagged null record;
3260 -- Obj : T;
3261 -- type DT is new T with null record;
3262 -- end;
3264 -- In this case the type will be frozen later by the usual
3265 -- mechanism: an object declaration, an instantiation, or the
3266 -- end of a declarative part.
3270 then
3274 -- Case of full view present
3278 -- If full view has already been frozen, then no further
3279 -- processing is required
3287 -- Otherwise freeze full view and patch the pointers so that
3288 -- the freeze node will elaborate both views in the back-end.
3290 else
3291 declare
3294 begin
3297 then
3298 Freeze_And_Append
3311 else
3312 -- {Incomplete,Private}_Subtypes with Full_Views
3313 -- constrained by discriminants.
3324 -- AI-117 requires that the convention of a partial view be the
3325 -- same as the convention of the full view. Note that this is a
3326 -- recognized breach of privacy, but it's essential for logical
3327 -- consistency of representation, and the lack of a rule in
3328 -- RM95 was an oversight.
3335 -- Size information is copied from the full view to the
3336 -- incomplete or private view for consistency.
3338 -- We skip this is the full view is not a type. This is very
3339 -- strange of course, and can only happen as a result of
3340 -- certain illegalities, such as a premature attempt to derive
3341 -- from an incomplete type.
3350 -- Case of no full view present. If entity is derived or subtype,
3351 -- it is safe to freeze, correctness depends on the frozen status
3352 -- of parent. Otherwise it is either premature usage, or a Taft
3353 -- amendment type, so diagnosis is at the point of use and the
3354 -- type might be frozen later.
3358 then
3361 else
3366 -- For access subprogram, freeze types of all formals, the return
3367 -- type was already frozen, since it is the Etype of the function.
3378 -- Ada 2005 (AI-326): Check wrong use of tag incomplete type
3380 -- type T is tagged;
3381 -- type Acc is access function (X : T) return T; -- ERROR
3387 then
3388 Error_Msg_N
3392 -- For access to a protected subprogram, freeze the equivalent type
3393 -- (however this is not set if we are not generating code or if this
3394 -- is an anonymous type used just for resolution).
3398 -- AI-326: Check wrong use of tagged incomplete types
3400 -- type T is tagged;
3401 -- type As3D is access protected
3402 -- function (X : Float) return T; -- ERROR
3404 declare
3407 begin
3418 then
3419 Error_Msg_N
3429 -- Generic types are never seen by the back-end, and are also not
3430 -- processed by the expander (since the expander is turned off for
3431 -- generic processing), so we never need freeze nodes for them.
3437 -- Some special processing for non-generic types to complete
3438 -- representation details not known till the freeze point.
3443 -- Some error checks required for ordinary fixed-point type. Defer
3444 -- these till the freeze-point since we need the small and range
3445 -- values. We only do these checks for base types
3449 then
3452 Error_Msg_N
3457 Error_Msg_N
3463 Error_Msg_N
3469 Error_Msg_N
3482 -- Check restriction for standard storage pool
3488 -- Deal with error message for pure access type. This is not an
3489 -- error in Ada 2005 if there is no pool (see AI-366).
3494 then
3499 -- Case of composite types
3503 -- AI-117 requires that all new primitives of a tagged type must
3504 -- inherit the convention of the full view of the type. Inherited
3505 -- and overriding operations are defined to inherit the convention
3506 -- of their parent or overridden subprogram (also specified in
3507 -- AI-117), which will have occurred earlier (in Derive_Subprogram
3508 -- and New_Overloaded_Entity). Here we set the convention of
3509 -- primitives that are still convention Ada, which will ensure
3510 -- that any new primitives inherit the type's convention. Class-
3511 -- wide types can have a foreign convention inherited from their
3512 -- specific type, but are excluded from this since they don't have
3513 -- any associated primitives.
3518 then
3519 declare
3522 begin
3535 -- Generate primitive operation references for a tagged type
3539 then
3540 declare
3546 begin
3547 -- Handle subtypes
3551 then
3553 else
3557 -- Ada 2005 (AI-345): In case of concurrent type generate
3558 -- reference to the wrapper that allow us to dispatch calls
3559 -- through their implemented abstract interface types.
3561 -- The check for Present here is to protect against previously
3562 -- reported critical errors.
3566 then
3567 Prim_List := Primitive_Operations
3569 else
3573 -- Loop to generate references for primitive operations
3579 -- If the operation is derived, get the original for
3580 -- cross-reference purposes (it is the original for
3581 -- which we want the xref, and for which the comes
3582 -- from source test needs to be performed).
3596 -- Now that all types from which E may depend are frozen, see if the
3597 -- size is known at compile time, if it must be unsigned, or if
3598 -- strict alignment is required
3607 -- Do not allow a size clause for a type which does not have a size
3608 -- that is known at compile time
3612 then
3613 -- Supress this message if errors posted on E, even if we are
3614 -- in all errors mode, since this is often a junk message
3617 Error_Msg_N
3623 -- Remaining process is to set/verify the representation information,
3624 -- in particular the size and alignment values. This processing is
3625 -- not required for generic types, since generic types do not play
3626 -- any part in code generation, and so the size and alignment values
3627 -- for such types are irrelevant.
3632 -- Otherwise we call the layout procedure
3634 else
3638 -- End of freeze processing for type entities
3641 -- Here is where we logically freeze the current entity. If it has a
3642 -- freeze node, then this is the point at which the freeze node is
3643 -- linked into the result list.
3647 -- If a freeze node is already allocated, use it, otherwise allocate
3648 -- a new one. The preallocation happens in the case of anonymous base
3649 -- types, where we preallocate so that we can set First_Subtype_Link.
3650 -- Note that we reset the Sloc to the current freeze location.
3656 else
3668 else
3672 -- A final pass over record types with discriminants. If the type
3673 -- has an incomplete declaration, there may be constrained access
3674 -- subtypes declared elsewhere, which do not depend on the discrimi-
3675 -- nants of the type, and which are used as component types (i.e.
3676 -- the full view is a recursive type). The designated types of these
3677 -- subtypes can only be elaborated after the type itself, and they
3678 -- need an itype reference.
3682 then
3683 declare
3688 begin
3699 then
3711 -- When a type is frozen, the first subtype of the type is frozen as
3712 -- well (RM 13.14(15)). This has to be done after freezing the type,
3713 -- since obviously the first subtype depends on its own base type.
3718 -- If we just froze a tagged non-class wide record, then freeze the
3719 -- corresponding class-wide type. This must be done after the tagged
3720 -- type itself is frozen, because the class-wide type refers to the
3721 -- tagged type which generates the class.
3726 then
3733 -- Special handling for subprograms
3737 -- If subprogram has address clause then reset Is_Public flag, since
3738 -- we do not want the backend to generate external references.
3742 then
3745 -- If no address clause and not intrinsic, then for imported
3746 -- subprogram in main unit, generate descriptor if we are in
3747 -- Propagate_Exceptions mode.
3749 elsif Propagate_Exceptions
3753 then
3763 -----------------------------
3764 -- Freeze_Enumeration_Type --
3765 -----------------------------
3768 begin
3772 then
3774 else
3779 -----------------------
3780 -- Freeze_Expression --
3781 -----------------------
3792 -- This flag is set true if the entity must be frozen outside the
3793 -- current subprogram. This happens in the case of expander generated
3794 -- subprograms (_Init_Proc, _Input, _Output, _Read, _Write) which do
3795 -- not freeze all entities like other bodies, but which nevertheless
3796 -- may reference entities that have to be frozen before the body and
3797 -- obviously cannot be frozen inside the body.
3800 -- Given an N_Handled_Sequence_Of_Statements node N, determines whether
3801 -- it is the handled statement sequence of an expander-generated
3802 -- subprogram (init proc, stream subprogram, or renaming as body).
3803 -- If so, this is not a freezing context.
3805 -----------------
3806 -- In_Exp_Body --
3807 -----------------
3813 begin
3816 else
3823 else
3833 N_Subprogram_Renaming_Declaration)
3834 then
3836 else
3842 -- Start of processing for Freeze_Expression
3844 begin
3845 -- Immediate return if freezing is inhibited. This flag is set by the
3846 -- analyzer to stop freezing on generated expressions that would cause
3847 -- freezing if they were in the source program, but which are not
3848 -- supposed to freeze, since they are created.
3854 -- If expression is non-static, then it does not freeze in a default
3855 -- expression, see section "Handling of Default Expressions" in the
3856 -- spec of package Sem for further details. Note that we have to
3857 -- make sure that we actually have a real expression (if we have
3858 -- a subtype indication, we can't test Is_Static_Expression!)
3860 if In_Def_Exp
3863 then
3867 -- Freeze type of expression if not frozen already
3875 -- Base type may be an derived numeric type that is frozen at
3876 -- the point of declaration, but first_subtype is still unfrozen.
3883 -- For entity name, freeze entity if not frozen already. A special
3884 -- exception occurs for an identifier that did not come from source.
3885 -- We don't let such identifiers freeze a non-internal entity, i.e.
3886 -- an entity that did come from source, since such an identifier was
3887 -- generated by the expander, and cannot have any semantic effect on
3888 -- the freezing semantics. For example, this stops the parameter of
3889 -- an initialization procedure from freezing the variable.
3896 then
3898 else
3902 -- For an allocator freeze designated type if not frozen already
3904 -- For an aggregate whose component type is an access type, freeze the
3905 -- designated type now, so that its freeze does not appear within the
3906 -- loop that might be created in the expansion of the aggregate. If the
3907 -- designated type is a private type without full view, the expression
3908 -- cannot contain an allocator, so the type is not frozen.
3919 then
3923 when N_Selected_Component |
3924 N_Indexed_Component |
3925 N_Slice =>
3938 then
3942 -- All done if nothing needs freezing
3947 then
3951 -- Loop for looking at the right place to insert the freeze nodes
3952 -- exiting from the loop when it is appropriate to insert the freeze
3953 -- node before the current node P.
3955 -- Also checks some special exceptions to the freezing rules. These
3956 -- cases result in a direct return, bypassing the freeze action.
3959 loop
3962 -- If we don't have a parent, then we are not in a well-formed tree.
3963 -- This is an unusual case, but there are some legitimate situations
3964 -- in which this occurs, notably when the expressions in the range of
3965 -- a type declaration are resolved. We simply ignore the freeze
3966 -- request in this case. Is this right ???
3972 -- See if we have got to an appropriate point in the tree
3976 -- A special test for the exception of (RM 13.14(8)) for the case
3977 -- of per-object expressions (RM 3.8(18)) occurring in component
3978 -- definition or a discrete subtype definition. Note that we test
3979 -- for a component declaration which includes both cases we are
3980 -- interested in, and furthermore the tree does not have explicit
3981 -- nodes for either of these two constructs.
3985 -- The case we want to test for here is an identifier that is
3986 -- a per-object expression, this is either a discriminant that
3987 -- appears in a context other than the component declaration
3988 -- or it is a reference to the type of the enclosing construct.
3990 -- For either of these cases, we skip the freezing
3992 if not In_Default_Expression
3995 then
3996 -- We recognize the discriminant case by just looking for
3997 -- a reference to a discriminant. It can only be one for
3998 -- the enclosing construct. Skip freezing in this case.
4003 -- For the case of a reference to the enclosing record,
4004 -- (or task or protected type), we look for a type that
4005 -- matches the current scope.
4012 -- If we have an enumeration literal that appears as the choice in
4013 -- the aggregate of an enumeration representation clause, then
4014 -- freezing does not occur (RM 13.14(10)).
4018 -- The case we are looking for is an enumeration literal
4022 then
4023 -- If enumeration literal appears directly as the choice,
4024 -- do not freeze (this is the normal non-overloade case)
4028 then
4031 -- If enumeration literal appears as the name of function
4032 -- which is the choice, then also do not freeze. This
4033 -- happens in the overloaded literal case, where the
4034 -- enumeration literal is temporarily changed to a function
4035 -- call for overloading analysis purposes.
4038 and then
4040 and then
4042 then
4047 -- Normally if the parent is a handled sequence of statements,
4048 -- then the current node must be a statement, and that is an
4049 -- appropriate place to insert a freeze node.
4053 -- An exception occurs when the sequence of statements is for
4054 -- an expander generated body that did not do the usual freeze
4055 -- all operation. In this case we usually want to freeze
4056 -- outside this body, not inside it, and we skip past the
4057 -- subprogram body that we are inside.
4061 -- However, we *do* want to freeze at this point if we have
4062 -- an entity to freeze, and that entity is declared *inside*
4063 -- the body of the expander generated procedure. This case
4064 -- is recognized by the scope of the type, which is either
4065 -- the spec for some enclosing body, or (in the case of
4066 -- init_procs, for which there are no separate specs) the
4067 -- current scope.
4069 declare
4073 begin
4078 or else
4080 then
4086 then
4092 -- If not that exception to the exception, then this is
4093 -- where we delay the freeze till outside the body.
4098 -- Here if normal case where we are in handled statement
4099 -- sequence and want to do the insertion right there.
4101 else
4105 -- If parent is a body or a spec or a block, then the current node
4106 -- is a statement or declaration and we can insert the freeze node
4107 -- before it.
4109 when N_Package_Specification |
4110 N_Package_Body |
4111 N_Subprogram_Body |
4112 N_Task_Body |
4113 N_Protected_Body |
4114 N_Entry_Body |
4117 -- The expander is allowed to define types in any statements list,
4118 -- so any of the following parent nodes also mark a freezing point
4119 -- if the actual node is in a list of statements or declarations.
4121 when N_Exception_Handler |
4122 N_If_Statement |
4123 N_Elsif_Part |
4124 N_Case_Statement_Alternative |
4125 N_Compilation_Unit_Aux |
4126 N_Selective_Accept |
4127 N_Accept_Alternative |
4128 N_Delay_Alternative |
4129 N_Conditional_Entry_Call |
4130 N_Entry_Call_Alternative |
4131 N_Triggering_Alternative |
4132 N_Abortable_Part |
4133 N_Freeze_Entity =>
4137 -- Note: The N_Loop_Statement is a special case. A type that
4138 -- appears in the source can never be frozen in a loop (this
4139 -- occurs only because of a loop expanded by the expander), so we
4140 -- keep on going. Otherwise we terminate the search. Same is true
4141 -- of any entity which comes from source. (if they have predefined
4142 -- type, that type does not appear to come from source, but the
4143 -- entity should not be frozen here).
4149 -- For all other cases, keep looking at parents
4155 -- We fall through the case if we did not yet find the proper
4156 -- place in the free for inserting the freeze node, so climb!
4161 -- If the expression appears in a record or an initialization procedure,
4162 -- the freeze nodes are collected and attached to the current scope, to
4163 -- be inserted and analyzed on exit from the scope, to insure that
4164 -- generated entities appear in the correct scope. If the expression is
4165 -- a default for a discriminant specification, the scope is still void.
4166 -- The expression can also appear in the discriminant part of a private
4167 -- or concurrent type.
4169 -- If the expression appears in a constrained subcomponent of an
4170 -- enclosing record declaration, the freeze nodes must be attached to
4171 -- the outer record type so they can eventually be placed in the
4172 -- enclosing declaration list.
4174 -- The other case requiring this special handling is if we are in a
4175 -- default expression, since in that case we are about to freeze a
4176 -- static type, and the freeze scope needs to be the outer scope, not
4177 -- the scope of the subprogram with the default parameter.
4179 -- For default expressions in generic units, the Move_Freeze_Nodes
4180 -- mechanism (see sem_ch12.adb) takes care of placing them at the proper
4181 -- place, after the generic unit.
4184 or else Freeze_Outside
4189 then
4190 declare
4195 begin
4208 -- The current scope may be that of a constrained component of
4209 -- an enclosing record declaration, which is above the current
4210 -- scope in the scope stack.
4219 Freeze_Nodes;
4220 else
4230 -- Now we have the right place to do the freezing. First, a special
4231 -- adjustment, if we are in default expression analysis mode, these
4232 -- freeze actions must not be thrown away (normally all inserted actions
4233 -- are thrown away in this mode. However, the freeze actions are from
4234 -- static expressions and one of the important reasons we are doing this
4235 -- special analysis is to get these freeze actions. Therefore we turn
4236 -- off the In_Default_Expression mode to propagate these freeze actions.
4237 -- This also means they get properly analyzed and expanded.
4241 -- Freeze the designated type of an allocator (RM 13.14(13))
4247 -- Freeze type of expression (RM 13.14(10)). Note that we took care of
4248 -- the enumeration representation clause exception in the loop above.
4254 -- Freeze name if one is present (RM 13.14(11))
4263 -----------------------------
4264 -- Freeze_Fixed_Point_Type --
4265 -----------------------------
4267 -- Certain fixed-point types and subtypes, including implicit base types
4268 -- and declared first subtypes, have not yet set up a range. This is
4269 -- because the range cannot be set until the Small and Size values are
4270 -- known, and these are not known till the type is frozen.
4272 -- To signal this case, Scalar_Range contains an unanalyzed syntactic range
4273 -- whose bounds are unanalyzed real literals. This routine will recognize
4274 -- this case, and transform this range node into a properly typed range
4275 -- with properly analyzed and resolved values.
4293 -- Returns size of type with given bounds. Also leaves these
4294 -- bounds set as the current bounds of the Typ.
4296 -----------
4297 -- Fsize --
4298 -----------
4301 begin
4307 -- Start of processing for Freeze_Fixed_Point_Type
4309 begin
4310 -- If Esize of a subtype has not previously been set, set it now
4317 else
4322 -- Immediate return if the range is already analyzed. This means that
4323 -- the range is already set, and does not need to be computed by this
4324 -- routine.
4330 -- Immediate return if either of the bounds raises Constraint_Error
4334 then
4341 -- Ordinary fixed-point case
4345 -- For the ordinary fixed-point case, we are allowed to fudge the
4346 -- end-points up or down by small. Generally we prefer to fudge up,
4347 -- i.e. widen the bounds for non-model numbers so that the end points
4348 -- are included. However there are cases in which this cannot be
4349 -- done, and indeed cases in which we may need to narrow the bounds.
4350 -- The following circuit makes the decision.
4352 -- Note: our terminology here is that Incl_EP means that the bounds
4353 -- are widened by Small if necessary to include the end points, and
4354 -- Excl_EP means that the bounds are narrowed by Small to exclude the
4355 -- end-points if this reduces the size.
4357 -- Note that in the Incl case, all we care about is including the
4358 -- end-points. In the Excl case, we want to narrow the bounds as
4359 -- much as permitted by the RM, to give the smallest possible size.
4376 begin
4377 -- First step. Base types are required to be symmetrical. Right
4378 -- now, the base type range is a copy of the first subtype range.
4379 -- This will be corrected before we are done, but right away we
4380 -- need to deal with the case where both bounds are non-negative.
4381 -- In this case, we set the low bound to the negative of the high
4382 -- bound, to make sure that the size is computed to include the
4383 -- required sign. Note that we do not need to worry about the
4384 -- case of both bounds negative, because the sign will be dealt
4385 -- with anyway. Furthermore we can't just go making such a bound
4386 -- symmetrical, since in a twos-complement system, there is an
4387 -- extra negative value which could not be accomodated on the
4388 -- positive side.
4393 then
4398 -- Compute the fudged bounds. If the number is a model number,
4399 -- then we do nothing to include it, but we are allowed to backoff
4400 -- to the next adjacent model number when we exclude it. If it is
4401 -- not a model number then we straddle the two values with the
4402 -- model numbers on either side.
4408 else
4412 -- The low value excluding the end point is Small greater, but
4413 -- we do not do this exclusion if the low value is positive,
4414 -- since it can't help the size and could actually hurt by
4415 -- crossing the high bound.
4420 -- If the value went from negative to zero, then we have the
4421 -- case where Loval_Incl_EP is the model number just below
4422 -- zero, so we want to stick to the negative value for the
4423 -- base type to maintain the condition that the size will
4424 -- include signed values.
4428 then
4432 else
4436 -- Similar processing for upper bound and high value
4442 else
4448 else
4452 -- One further adjustment is needed. In the case of subtypes, we
4453 -- cannot go outside the range of the base type, or we get
4454 -- peculiarities, and the base type range is already set. This
4455 -- only applies to the Incl values, since clearly the Excl values
4456 -- are already as restricted as they are allowed to be.
4463 -- Get size including and excluding end points
4468 -- No need to exclude end-points if it does not reduce size
4478 -- Now we set the actual size to be used. We want to use the
4479 -- bounds fudged up to include the end-points but only if this
4480 -- can be done without violating a specifically given size
4481 -- size clause or causing an unacceptable increase in size.
4483 -- Case of size clause given
4487 -- Use the inclusive size only if it is consistent with
4488 -- the explicitly specified size.
4495 -- If the inclusive size is too large, we try excluding
4496 -- the end-points (will be caught later if does not work).
4498 else
4504 -- Case of size clause not given
4506 else
4507 -- If we have a base type whose corresponding first subtype
4508 -- has an explicit size that is large enough to include our
4509 -- end-points, then do so. There is no point in working hard
4510 -- to get a base type whose size is smaller than the specified
4511 -- size of the first subtype.
4517 then
4522 -- If excluding the end-points makes the size smaller and
4523 -- results in a size of 8,16,32,64, then we take the smaller
4524 -- size. For the 64 case, this is compulsory. For the other
4525 -- cases, it seems reasonable. We like to include end points
4526 -- if we can, but not at the expense of moving to the next
4527 -- natural boundary of size.
4530 and then
4535 then
4540 -- Otherwise we can definitely include the end points
4542 else
4548 -- One pathological case: normally we never fudge a low bound
4549 -- down, since it would seem to increase the size (if it has
4550 -- any effect), but for ranges containing single value, or no
4551 -- values, the high bound can be small too large. Consider:
4553 -- type t is delta 2.0**(-14)
4554 -- range 131072.0 .. 0;
4556 -- That lower bound is *just* outside the range of 32 bits, and
4557 -- does need fudging down in this case. Note that the bounds
4558 -- will always have crossed here, since the high bound will be
4559 -- fudged down if necessary, as in the case of:
4561 -- type t is delta 2.0**(-14)
4562 -- range 131072.0 .. 131072.0;
4564 -- So we detect the situation by looking for crossed bounds,
4565 -- and if the bounds are crossed, and the low bound is greater
4566 -- than zero, we will always back it off by small, since this
4567 -- is completely harmless.
4574 -- And of course, we need to do exactly the same parallel
4575 -- fudge for flat ranges in the negative region.
4588 -- For the decimal case, none of this fudging is required, since there
4589 -- are no end-point problems in the decimal case (the end-points are
4590 -- always included).
4592 else
4596 -- At this stage, the actual size has been calculated and the proper
4597 -- required bounds are stored in the low and high bounds.
4601 Error_Msg_N
4603 Typ);
4607 -- Check size against explicit given size
4613 Error_Msg_NE
4617 else
4621 -- Increase size to next natural boundary if no size clause given
4623 else
4630 else
4638 -- If we have a base type, then expand the bounds so that they extend to
4639 -- the full width of the allocated size in bits, to avoid junk range
4640 -- checks on intermediate computations.
4647 -- Final step is to reanalyze the bounds using the proper type
4648 -- and set the Corresponding_Integer_Value fields of the literals.
4654 -- Resolve with universal fixed if the base type, and the base type if
4655 -- it is a subtype. Note we can't resolve the base type with itself,
4656 -- that would be a reference before definition.
4660 else
4664 -- Set corresponding integer value for bound
4666 Set_Corresponding_Integer_Value
4669 -- Similar processing for high bound
4677 else
4681 Set_Corresponding_Integer_Value
4684 -- Set type of range to correspond to bounds
4688 -- Set Esize to calculated size if not set already
4694 -- Set RM_Size if not already set. If already set, check value
4696 declare
4699 begin
4704 Error_Msg_NE
4709 else
4715 ------------------
4716 -- Freeze_Itype --
4717 ------------------
4722 begin
4731 --------------------------
4732 -- Freeze_Static_Object --
4733 --------------------------
4738 -- Exception raised if the type of a static object cannot be made
4739 -- static. This happens if the type depends on non-global objects.
4742 -- Called to ensure that an expression used as part of a type definition
4743 -- is statically allocatable, which means that the expression type is
4744 -- statically allocatable, and the expression is either static, or a
4745 -- reference to a library level constant.
4748 -- Called to mark a type as static, checking that it is possible
4749 -- to set the type as static. If it is not possible, then the
4750 -- exception Cannot_Be_Static is raised.
4752 -----------------------------
4753 -- Ensure_Expression_Is_SA --
4754 -----------------------------
4759 begin
4771 then
4779 -----------------------
4780 -- Ensure_Type_Is_SA --
4781 -----------------------
4787 begin
4788 -- If type is library level, we are all set
4794 -- We are also OK if the type already marked as statically allocated,
4795 -- which means we processed it before.
4801 -- Mark type as statically allocated
4805 -- Check that it is safe to statically allocate this type
4823 declare
4827 begin
4840 else
4849 then
4868 else
4873 -- Start of processing for Freeze_Static_Object
4875 begin
4878 exception
4881 -- If the object that cannot be static is imported or exported,
4882 -- then we give an error message saying that this object cannot
4883 -- be imported or exported.
4886 Error_Msg_N
4889 -- Otherwise must be exported, something is wrong if compiler
4890 -- is marking something as statically allocated which cannot be).
4893 Error_Msg_N
4898 -----------------------
4899 -- Freeze_Subprogram --
4900 -----------------------
4906 begin
4907 -- Subprogram may not have an address clause unless it is imported
4911 Error_Msg_N
4918 -- Reset the Pure indication on an imported subprogram unless an
4919 -- explicit Pure_Function pragma was present. We do this because
4920 -- otherwise it is an insidious error to call a non-pure function from
4921 -- pure unit and have calls mysteriously optimized away. What happens
4922 -- here is that the Import can bypass the normal check to ensure that
4923 -- pure units call only pure subprograms.
4928 then
4932 -- For non-foreign convention subprograms, this is where we create
4933 -- the extra formals (for accessibility level and constrained bit
4934 -- information). We delay this till the freeze point precisely so
4935 -- that we know the convention!
4941 -- If this is convention Ada and a Valued_Procedure, that's odd
4946 and then Warn_On_Export_Import
4947 then
4948 Error_Msg_N
4953 -- Case of foreign convention
4955 else
4958 -- For foreign conventions, warn about return of an
4959 -- unconstrained array.
4961 -- Note: we *do* allow a return by descriptor for the VMS case,
4962 -- though here there is probably more to be done ???
4967 -- If no return type, probably some other error, e.g. a
4968 -- missing full declaration, so ignore.
4973 -- If the return type is generic, we have emitted a warning
4974 -- earlier on, and there is nothing else to check here. Specific
4975 -- instantiations may lead to erroneous behavior.
4983 and then Warn_On_Export_Import
4984 then
4985 Error_Msg_N
4992 -- If any of the formals for an exported foreign convention
4993 -- subprogram have defaults, then emit an appropriate warning since
4994 -- this is odd (default cannot be used from non-Ada code)
4999 if Warn_On_Export_Import
5001 then
5002 Error_Msg_N
5012 -- For VMS, descriptor mechanisms for parameters are allowed only
5013 -- for imported/exported subprograms. Moreover, the NCA descriptor
5014 -- is not allowed for parameters of exported subprograms.
5021 Error_Msg_N
5023 Error_Msg_N
5034 Error_Msg_N
5036 Error_Msg_N
5045 -- Pragma Inline_Always is disallowed for dispatching subprograms
5046 -- because the address of such subprograms is saved in the dispatch
5047 -- table to support dispatching calls, and dispatching calls cannot
5048 -- be inlined. This is consistent with the restriction against using
5049 -- 'Access or 'Address on an Inline_Always subprogram.
5053 then
5054 Error_Msg_N
5059 ----------------------
5060 -- Is_Fully_Defined --
5061 ----------------------
5064 begin
5073 then
5074 -- Verify that the record type has no components with private types
5075 -- without completion.
5077 declare
5080 begin
5093 else
5099 ---------------------------------
5100 -- Process_Default_Expressions --
5101 ---------------------------------
5103 procedure Process_Default_Expressions
5106 is
5113 begin
5116 -- A subprogram instance and its associated anonymous subprogram share
5117 -- their signature. The default expression functions are defined in the
5118 -- wrapper packages for the anonymous subprogram, and should not be
5119 -- generated again for the instance.
5124 then
5132 -- We work with a copy of the default expression because we
5133 -- do not want to disturb the original, since this would mess
5134 -- up the conformance checking.
5138 -- The analysis of the expression may generate insert actions,
5139 -- which of course must not be executed. We wrap those actions
5140 -- in a procedure that is not called, and later on eliminated.
5141 -- The following cases have no side-effects, and are analyzed
5142 -- directly.
5153 and then
5155 then
5157 -- If there is no default function, we must still do a full
5158 -- analyze call on the default value, to ensure that all error
5159 -- checks are performed, e.g. those associated with static
5160 -- evaluation. Note: this branch will always be taken if the
5161 -- analyzer is turned off (but we still need the error checks).
5163 -- Note: the setting of parent here is to meet the requirement
5164 -- that we can only analyze the expression while attached to
5165 -- the tree. Really the requirement is that the parent chain
5166 -- be set, we don't actually need to be in the tree.
5171 -- Default expressions are resolved with their own type if the
5172 -- context is generic, to avoid anomalies with private types.
5176 else
5180 -- If that resolved expression will raise constraint error,
5181 -- then flag the default value as raising constraint error.
5182 -- This allows a proper error message on the calls.
5188 -- If the default is a parameterless call, we use the name of
5189 -- the called function directly, and there is no body to build.
5193 then
5196 -- Else construct and analyze the body of a wrapper procedure
5197 -- that contains an object declaration to hold the expression.
5198 -- Given that this is done only to complete the analysis, it
5199 -- simpler to build a procedure than a function which might
5200 -- involve secondary stack expansion.
5202 else
5203 Dnam :=
5206 Dbody :=
5208 Specification =>
5214 Defining_Identifier =>
5217 Object_Definition =>
5221 Handled_Statement_Sequence =>
5239 ----------------------------------------
5240 -- Set_Component_Alignment_If_Not_Set --
5241 ----------------------------------------
5244 begin
5245 -- Ignore if not base type, subtypes don't need anything
5251 -- Do not override existing representation
5262 else
5263 Set_Component_Alignment
5269 ---------------------------
5270 -- Set_Debug_Info_Needed --
5271 ---------------------------
5274 begin
5278 then
5280 else
5291 declare
5293 begin
5303 declare
5305 begin
5328 ------------------
5329 -- Undelay_Type --
5330 ------------------
5333 begin
5337 -- Since we don't want T to have a Freeze_Node, we don't want its
5338 -- Full_View or Corresponding_Record_Type to have one either.
5340 -- ??? Fundamentally, this whole handling is a kludge. What we really
5341 -- want is to be sure that for an Itype that's part of record R and is a
5342 -- subtype of type T, that it's frozen after the later of the freeze
5343 -- points of R and T. We have no way of doing that directly, so what we
5344 -- do is force most such Itypes to be frozen as part of freezing R via
5345 -- this procedure and only delay the ones that need to be delayed
5346 -- (mostly the designated types of access types that are defined as part
5347 -- of the record).
5353 then
5361 then
5366 ------------------
5367 -- Warn_Overlay --
5368 ------------------
5370 procedure Warn_Overlay
5374 is
5376 -- The object to which the address clause applies
5382 begin
5383 -- No warning if address clause overlay warnings are off
5389 -- No warning if there is an explicit initialization
5397 -- We only give the warning for non-imported entities of a type for
5398 -- which a non-null base init proc is defined (or for access types which
5399 -- have implicit null initialization).
5405 then
5408 then
5413 then
5420 then
5427 -- A function call (most likely to To_Address) is probably not an
5428 -- overlay, so skip warning. Ditto if the function call was inlined
5429 -- and transformed into an entity.
5437 -- If a pragma Import follows, we assume that it is for the current
5438 -- target of the address clause, and skip the warning.
5443 then
5449 Error_Msg_N
5451 Nam);
5452 else
5453 Error_Msg_N
5455 Nam);
5458 -- Add friendly warning if initialization comes from a packed array
5459 -- component.
5462 declare
5465 begin
5471 then
5475 then
5476 Error_Msg_NE
5481 else
5488 Error_Msg_N
5491 Nam);