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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) 1992-2015, 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 ------------------------------------------------------------------------------
74 -----------------------
75 -- Local Subprograms --
76 -----------------------
79 -- Typ is a type that is being frozen. If no size clause is given,
80 -- but a default Esize has been computed, then this default Esize is
81 -- adjusted up if necessary to be consistent with a given alignment,
82 -- but never to a value greater than Long_Long_Integer'Size. This
83 -- is used for all discrete types and for fixed-point types.
85 procedure Build_And_Analyze_Renamed_Body
89 -- Build body for a renaming declaration, insert in tree and analyze
92 -- Apply legality checks to address clauses for object declarations,
93 -- at the point the object is frozen. Also ensure any initialization is
94 -- performed only after the object has been frozen.
96 procedure Check_Component_Storage_Order
101 -- For an Encl_Type that has a Scalar_Storage_Order attribute definition
102 -- clause, verify that the component type has an explicit and compatible
103 -- attribute/aspect. For arrays, Comp is Empty; for records, it is the
104 -- entity of the component under consideration. For an Encl_Type that
105 -- does not have a Scalar_Storage_Order attribute definition clause,
106 -- verify that the component also does not have such a clause.
107 -- ADC is the attribute definition clause if present (or Empty). On return,
108 -- Comp_ADC_Present is set True if the component has a Scalar_Storage_Order
109 -- attribute definition clause.
112 -- When an expression function is frozen by a use of it, the expression
113 -- itself is frozen. Check that the expression does not include references
114 -- to deferred constants without completion. We report this at the freeze
115 -- point of the function, to provide a better error message.
116 --
117 -- In most cases the expression itself is frozen by the time the function
118 -- itself is frozen, because the formals will be frozen by then. However,
119 -- Attribute references to outer types are freeze points for those types;
120 -- this routine generates the required freeze nodes for them.
123 -- E is a base type. If E is tagged or has a component that is aliased
124 -- or tagged or contains something this is aliased or tagged, set
125 -- Strict_Alignment.
129 -- If E is a fixed-point or discrete type, then all the necessary work
130 -- to freeze it is completed except for possible setting of the flag
131 -- Is_Unsigned_Type, which is done by this procedure. The call has no
132 -- effect if the entity E is not a discrete or fixed-point type.
134 procedure Freeze_And_Append
138 -- Freezes Ent using Freeze_Entity, and appends the resulting list of
139 -- nodes to Result, modifying Result from No_List if necessary. N has
140 -- the same usage as in Freeze_Entity.
143 -- Freeze enumeration type. The Esize field is set as processing
144 -- proceeds (i.e. set by default when the type is declared and then
145 -- adjusted by rep clauses. What this procedure does is to make sure
146 -- that if a foreign convention is specified, and no specific size
147 -- is given, then the size must be at least Integer'Size.
150 -- If an object is frozen which has Is_Statically_Allocated set, then
151 -- all referenced types must also be marked with this flag. This routine
152 -- is in charge of meeting this requirement for the object entity E.
155 -- Perform freezing actions for a subprogram (create extra formals,
156 -- and set proper default mechanism values). Note that this routine
157 -- is not called for internal subprograms, for which neither of these
158 -- actions is needed (or desirable, we do not want for example to have
159 -- these extra formals present in initialization procedures, where they
160 -- would serve no purpose). In this call E is either a subprogram or
161 -- a subprogram type (i.e. an access to a subprogram).
164 -- True if T is not private and has no private components, or has a full
165 -- view. Used to determine whether the designated type of an access type
166 -- should be frozen when the access type is frozen. This is done when an
167 -- allocator is frozen, or an expression that may involve attributes of
168 -- the designated type. Otherwise freezing the access type does not freeze
169 -- the designated type.
171 procedure Process_Default_Expressions
174 -- This procedure is called for each subprogram to complete processing of
175 -- default expressions at the point where all types are known to be frozen.
176 -- The expressions must be analyzed in full, to make sure that all error
177 -- processing is done (they have only been pre-analyzed). If the expression
178 -- is not an entity or literal, its analysis may generate code which must
179 -- not be executed. In that case we build a function body to hold that
180 -- code. This wrapper function serves no other purpose (it used to be
181 -- called to evaluate the default, but now the default is inlined at each
182 -- point of call).
185 -- Typ is a record or array type that is being frozen. This routine sets
186 -- the default component alignment from the scope stack values if the
187 -- alignment is otherwise not specified.
190 -- As each entity is frozen, this routine is called to deal with the
191 -- setting of Debug_Info_Needed for the entity. This flag is set if
192 -- the entity comes from source, or if we are in Debug_Generated_Code
193 -- mode or if the -gnatdV debug flag is set. However, it never sets
194 -- the flag if Debug_Info_Off is set. This procedure also ensures that
195 -- subsidiary entities have the flag set as required.
198 -- T is a record or array type that is being frozen. If it is a base type,
199 -- and if SSO_Set_Low/High_By_Default is set, then Reverse_Storage order
200 -- will be set appropriately. Note that an explicit occurrence of aspect
201 -- Scalar_Storage_Order or an explicit setting of this aspect with an
202 -- attribute definition clause occurs, then these two flags are reset in
203 -- any case, so call will have no effect.
206 -- T is a type of a component that we know to be an Itype. We don't want
207 -- this to have a Freeze_Node, so ensure it doesn't. Do the same for any
208 -- Full_View or Corresponding_Record_Type.
211 -- Expr is the expression for an address clause for entity Nam whose type
212 -- is Typ. If Typ has a default initialization, and there is no explicit
213 -- initialization in the source declaration, check whether the address
214 -- clause might cause overlaying of an entity, and emit a warning on the
215 -- side effect that the initialization will cause.
217 -------------------------------
218 -- Adjust_Esize_For_Alignment --
219 -------------------------------
224 begin
230 then
236 ------------------------------------
237 -- Build_And_Analyze_Renamed_Body --
238 ------------------------------------
240 procedure Build_And_Analyze_Renamed_Body
244 is
250 begin
251 -- If the renamed subprogram is intrinsic, there is no need for a
252 -- wrapper body: we set the alias that will be called and expanded which
253 -- completes the declaration. This transformation is only legal if the
254 -- renamed entity has already been elaborated.
256 -- Note that it is legal for a renaming_as_body to rename an intrinsic
257 -- subprogram, as long as the renaming occurs before the new entity
258 -- is frozen (RM 8.5.4 (5)).
262 then
264 else
270 and then
274 -- We can make the renaming entity intrinsic if the renamed function
275 -- has an interface name, or if it is one of the shift/rotate
276 -- operations known to the compiler.
278 and then
281 Name_Rotate_Right,
282 Name_Shift_Left,
283 Name_Shift_Right,
284 Name_Shift_Right_Arithmetic))
285 then
290 else
297 else
306 ------------------------
307 -- Build_Renamed_Body --
308 ------------------------
310 function Build_Renamed_Body
313 is
315 -- We use for the source location of the renamed body, the location of
316 -- the spec entity. It might seem more natural to use the location of
317 -- the renaming declaration itself, but that would be wrong, since then
318 -- the body we create would look as though it was created far too late,
319 -- and this could cause problems with elaboration order analysis,
320 -- particularly in connection with instantiations.
335 -- If the renamed entity is a primitive operation given in prefix form,
336 -- the prefix is the target object and it has to be added as the first
337 -- actual in the generated call.
339 begin
340 -- Determine the entity being renamed, which is the target of the call
341 -- statement. If the name is an explicit dereference, this is a renaming
342 -- of a subprogram type rather than a subprogram. The name itself is
343 -- fully analyzed.
354 else
361 else
367 -- If the renamed entity is a predefined operator, retain full name
368 -- to ensure its visibility.
372 then
374 else
378 else
381 and then
384 then
386 -- Retrieve the target object, to be added as a first actual
387 -- in the call.
392 else
396 -- Original name may have been overloaded, but is fully resolved now
401 -- For simple renamings, subsequent calls can be expanded directly as
402 -- calls to the renamed entity. The body must be generated in any case
403 -- for calls that may appear elsewhere. This is not done in the case
404 -- where the subprogram is an instantiation because the actual proper
405 -- body has not been built yet.
410 then
414 -- Check whether the return type is a limited view. If the subprogram
415 -- is already frozen the generated body may have a non-limited view
416 -- of the type, that must be used, because it is the one in the spec
417 -- of the renaming declaration.
421 then
422 declare
424 begin
426 Set_Result_Definition
432 -- The body generated for this renaming is an internal artifact, and
433 -- does not constitute a freeze point for the called entity.
440 declare
444 begin
445 -- The controlling formal may be an access parameter, or the
446 -- actual may be an access value, so adjust accordingly.
450 then
451 Actuals := New_List
456 then
457 Actuals :=
458 New_List (
462 else
470 else
481 -- If the renamed entity is an entry, inherit its profile. For other
482 -- renamings as bodies, both profiles must be subtype conformant, so it
483 -- is not necessary to replace the profile given in the declaration.
484 -- However, default values that are aggregates are rewritten when
485 -- partially analyzed, so we recover the original aggregate to insure
486 -- that subsequent conformity checking works. Similarly, if the default
487 -- expression was constant-folded, recover the original expression.
497 N_Access_Definition
498 then
506 then
517 -- If the renamed entity is a function, the generated body contains a
518 -- return statement. Otherwise, build a procedure call. If the entity is
519 -- an entry, subsequent analysis of the call will transform it into the
520 -- proper entry or protected operation call. If the renamed entity is
521 -- a character literal, return it directly.
527 then
528 Call_Node :=
530 Expression =>
536 Call_Node :=
541 Call_Node :=
544 else
545 Call_Node :=
551 -- Create entities for subprogram body and formals
564 Body_Node :=
568 Handled_Statement_Sequence =>
578 -- Link the body to the entity whose declaration it completes. If
579 -- the body is analyzed when the renamed entity is frozen, it may
580 -- be necessary to restore the proper scope (see package Exp_Ch13).
584 then
586 else
593 --------------------------
594 -- Check_Address_Clause --
595 --------------------------
606 begin
609 -- For a deferred constant, the initialization value is on full view
613 else
622 -- Has_Delayed_Freeze was set on E when the address clause was
623 -- analyzed, and must remain set because we want the address
624 -- clause to be elaborated only after any entity it references
625 -- has been elaborated.
628 -- If Rep_Clauses are to be ignored, remove address clause from
629 -- list attached to entity, because it may be illegal for gigi,
630 -- for example by breaking order of elaboration..
633 declare
636 begin
642 else
645 loop
655 -- And now remove the address clause
661 then
667 -- If a variable, or a non-imported constant, overlays a constant
668 -- object and has an initialization value, then the initialization
669 -- may end up writing into read-only memory. Detect the cases of
670 -- statically identical values and remove the initialization. In
671 -- the other cases, give a warning. We will give other warnings
672 -- later for the variable if it is assigned.
679 then
680 declare
684 begin
690 and then Compile_Time_Compare
694 then
699 and then Address_Clause_Overlay_Warnings
700 then
702 Error_Msg_NE
711 -- Capture initialization value at point of declaration,
712 -- and make explicit assignment legal, because object may
713 -- be a constant.
719 -- Move initialization to freeze actions, once the object has
720 -- been frozen and the address clause alignment check has been
721 -- performed.
730 -- If the objet is tagged, check whether the tag must be
731 -- reassigned explicitly.
741 -----------------------------
742 -- Check_Compile_Time_Size --
743 -----------------------------
748 -- Sets the compile time known size (32 bits or less) in the Esize
749 -- field, of T checking for a size clause that was given which attempts
750 -- to give a smaller size, and also checking for an alignment clause.
753 -- Recursive function that does all the work
756 -- If T is a constrained subtype, its size is not known if any of its
757 -- discriminant constraints is not static and it is not a null record.
758 -- The test is conservative and doesn't check that the components are
759 -- in fact constrained by non-static discriminant values. Could be made
760 -- more precise ???
762 --------------------
763 -- Set_Small_Size --
764 --------------------
767 begin
771 -- Check for bad size clause given
776 Error_Msg_NE
781 -- Set size if not set already
788 ----------------
789 -- Size_Known --
790 ----------------
799 begin
803 -- Always True for scalar types. This is true even for generic formal
804 -- scalar types. We used to return False in the latter case, but the
805 -- size is known at compile time, even in the template, we just do
806 -- not know the exact size but that's not the point of this routine.
810 then
813 -- Array types
817 -- String literals always have known size, and we can set it
824 -- Unconstrained types never have known at compile time size
829 -- Don't do any recursion on type with error posted, since we may
830 -- have a malformed type that leads us into a loop.
835 -- Otherwise if component size unknown, then array size unknown
841 -- Check for all indexes static, and also compute possible size
842 -- (in case it is less than 32 and may be packable).
844 declare
848 begin
857 else
865 then
868 else
873 else
885 -- Access types always have known at compile time sizes
890 -- For non-generic private types, go to underlying type if present
895 then
896 -- Don't do any recursion on type with error posted, since we may
897 -- have a malformed type that leads us into a loop.
901 else
905 -- Record types
909 -- A class-wide type is never considered to have a known size
914 -- A subtype of a variant record must not have non-static
915 -- discriminated components.
919 then
922 -- Don't do any recursion on type with error posted, since we may
923 -- have a malformed type that leads us into a loop.
929 -- Now look at the components of the record
931 declare
932 -- The following two variables are used to keep track of the
933 -- size of packed records if we can tell the size of the packed
934 -- record in the front end. Packed_Size_Known is True if so far
935 -- we can figure out the size. It is initialized to True for a
936 -- packed record, unless the record has discriminants or atomic
937 -- components or independent components.
939 -- The reason we eliminate the discriminated case is that
940 -- we don't know the way the back end lays out discriminated
941 -- packed records. If Packed_Size_Known is True, then
942 -- Packed_Size is the size in bits so far.
951 -- Size in bits so far
953 begin
954 -- Test for variant part present
960 N_Record_Definition
962 and then
963 Present (Variant_Part
965 then
966 -- If variant part is present, and type is unconstrained,
967 -- then we must have defaulted discriminants, or a size
968 -- clause must be present for the type, or else the size
969 -- is definitely not known at compile time.
972 and then
975 then
980 -- Loop through components
986 -- We do not know the packed size if there is a component
987 -- clause present (we possibly could, but this would only
988 -- help in the case of a record with partial rep clauses.
989 -- That's because in the case of full rep clauses, the
990 -- size gets figured out anyway by a different circuit).
996 -- We do not know the packed size for an atomic/VFA type
997 -- or component, or an independent type or component, or a
998 -- by-reference type or aliased component (because packing
999 -- does not touch these).
1007 then
1011 -- We need to identify a component that is an array where
1012 -- the index type is an enumeration type with non-standard
1013 -- representation, and some bound of the type depends on a
1014 -- discriminant.
1016 -- This is because gigi computes the size by doing a
1017 -- substitution of the appropriate discriminant value in
1018 -- the size expression for the base type, and gigi is not
1019 -- clever enough to evaluate the resulting expression (which
1020 -- involves a call to rep_to_pos) at compile time.
1022 -- It would be nice if gigi would either recognize that
1023 -- this expression can be computed at compile time, or
1024 -- alternatively figured out the size from the subtype
1025 -- directly, where all the information is at hand ???
1029 then
1030 declare
1038 begin
1045 then
1051 then
1056 then
1066 -- Clearly size of record is not known if the size of one of
1067 -- the components is not known.
1073 -- Accumulate packed size if possible
1077 -- We can only deal with elementary types, since for
1078 -- non-elementary components, alignment enters into the
1079 -- picture, and we don't know enough to handle proper
1080 -- alignment in this context. Packed arrays count as
1081 -- elementary if the representation is a modular type.
1085 and then Present
1087 and then Is_Modular_Integer_Type
1089 then
1090 -- Packed size unknown if we have an atomic/VFA type
1091 -- or a by-reference type, since the back end knows
1092 -- how these are layed out.
1096 then
1099 -- If RM_Size is known and static, then we can keep
1100 -- accumulating the packed size
1104 -- A little glitch, to be removed sometime ???
1105 -- gigi does not understand zero sizes yet.
1110 -- Normal case where we can keep accumulating the
1111 -- packed array size.
1113 else
1117 -- If we have a field whose RM_Size is not known then
1118 -- we can't figure out the packed size here.
1120 else
1124 -- If we have a non-elementary type we can't figure out
1125 -- the packed array size (alignment issues).
1127 else
1142 -- All other cases, size not known at compile time
1144 else
1149 -------------------------------------
1150 -- Static_Discriminated_Components --
1151 -------------------------------------
1153 function Static_Discriminated_Components
1155 is
1158 begin
1162 then
1176 -- Start of processing for Check_Compile_Time_Size
1178 begin
1182 -----------------------------------
1183 -- Check_Component_Storage_Order --
1184 -----------------------------------
1186 procedure Check_Component_Storage_Order
1191 is
1197 -- Set for the record case, True if Comp starts on a byte boundary
1198 -- (in which case it is allowed to have different storage order).
1201 -- Set True when the component is a nested composite, and it does not
1202 -- have the same scalar storage order as Encl_Type.
1206 begin
1207 -- Record case
1217 else
1218 -- If a component clause is present, check if the component starts
1219 -- on a storage element boundary. Otherwise conservatively assume
1220 -- it does so only in the case where the record is not packed.
1223 Comp_Byte_Aligned :=
1225 else
1232 -- Array case
1234 else
1241 -- Note: the Reverse_Storage_Order flag is set on the base type, but
1242 -- the attribute definition clause is attached to the first subtype.
1245 Comp_ADC := Get_Attribute_Definition_Clause
1247 Attribute_Scalar_Storage_Order);
1250 -- Case of record or array component: check storage order compatibility.
1251 -- But, if the record has Complex_Representation, then it is treated as
1252 -- a scalar in the back end so the storage order is irrelevant.
1257 then
1258 Comp_SSO_Differs :=
1260 /=
1263 -- Parent and extension must have same storage order
1267 Error_Msg_N
1272 -- If enclosing composite has explicit SSO then nested composite must
1273 -- have explicit SSO as well.
1279 -- If component and composite SSO differs, check that component
1280 -- falls on byte boundaries and isn't packed.
1284 -- Component SSO differs from enclosing composite:
1286 -- Reject if component is a packed array, as it may be represented
1287 -- as a scalar internally.
1290 Error_Msg_N
1294 -- Reject if composite is a packed array, as it may be rewritten
1295 -- into an array of scalars.
1301 -- Reject if not byte aligned
1304 and then not Comp_Byte_Aligned
1305 then
1306 Error_Msg_N
1312 -- Enclosing type has explicit SSO: non-composite component must not
1313 -- be aliased.
1316 Error_Msg_N
1322 -----------------------------
1323 -- Check_Debug_Info_Needed --
1324 -----------------------------
1327 begin
1332 or else Debug_Generated_Code
1333 or else Debug_Flag_VV
1335 then
1340 -------------------------------
1341 -- Check_Expression_Function --
1342 -------------------------------
1348 -- Function to search for deferred constant
1350 -------------------
1351 -- Find_Constant --
1352 -------------------
1355 begin
1356 -- When a constant is initialized with the result of a dispatching
1357 -- call, the constant declaration is rewritten as a renaming of the
1358 -- displaced function result. This scenario is not a premature use of
1359 -- a constant even though the Has_Completion flag is not set.
1366 N_Object_Declaration
1369 then
1370 Error_Msg_NE
1378 then
1388 -- Start of processing for Check_Expression_Function
1390 begin
1395 then
1400 ----------------------------
1401 -- Check_Strict_Alignment --
1402 ----------------------------
1407 begin
1425 then
1435 -------------------------
1436 -- Check_Unsigned_Type --
1437 -------------------------
1444 begin
1449 -- Do not attempt to analyze case where range was in error
1455 -- The situation that is nontrivial is something like:
1457 -- subtype x1 is integer range -10 .. +10;
1458 -- subtype x2 is x1 range 0 .. V1;
1459 -- subtype x3 is x2 range V2 .. V3;
1460 -- subtype x4 is x3 range V4 .. V5;
1462 -- where Vn are variables. Here the base type is signed, but we still
1463 -- know that x4 is unsigned because of the lower bound of x2.
1465 -- The only way to deal with this is to look up the ancestor chain
1468 loop
1482 else
1485 -- If no ancestor had a static lower bound, go to base type
1489 -- Note: the reason we still check for a compile time known
1490 -- value for the base type is that at least in the case of
1491 -- generic formals, we can have bounds that fail this test,
1492 -- and there may be other cases in error situations.
1504 then
1514 -----------------------------
1515 -- Is_Atomic_VFA_Aggregate --
1516 -----------------------------
1525 begin
1528 -- Array may be qualified, so find outer context
1545 then
1554 then
1563 New_N :=
1575 -----------------------------------------------
1576 -- Explode_Initialization_Compound_Statement --
1577 -----------------------------------------------
1582 begin
1585 then
1588 -- Note that we rewrite Init_Stmts into a NULL statement, rather than
1589 -- just removing it, because Freeze_All may rely on this particular
1590 -- Node_Id still being present in the enclosing list to know where to
1591 -- stop freezing.
1599 ----------------
1600 -- Freeze_All --
1601 ----------------
1603 -- Note: the easy coding for this procedure would be to just build a
1604 -- single list of freeze nodes and then insert them and analyze them
1605 -- all at once. This won't work, because the analysis of earlier freeze
1606 -- nodes may recursively freeze types which would otherwise appear later
1607 -- on in the freeze list. So we must analyze and expand the freeze nodes
1608 -- as they are generated.
1615 -- This is the internal recursive routine that does freezing of entities
1616 -- (but NOT the analysis of default expressions, which should not be
1617 -- recursive, we don't want to analyze those till we are sure that ALL
1618 -- the types are frozen).
1620 --------------------
1621 -- Freeze_All_Ent --
1622 --------------------
1630 -- If freeze nodes are present, insert and analyze, and reset cursor
1631 -- for next insertion.
1633 -------------------
1634 -- Process_Flist --
1635 -------------------
1638 begin
1645 else
1651 -- Start of processing for Freeze_All_Ent
1653 begin
1657 -- If the entity is an inner package which is not a package
1658 -- renaming, then its entities must be frozen at this point. Note
1659 -- that such entities do NOT get frozen at the end of the nested
1660 -- package itself (only library packages freeze).
1662 -- Same is true for task declarations, where anonymous records
1663 -- created for entry parameters must be frozen.
1669 then
1680 then
1687 N_Single_Task_Declaration)
1688 then
1691 End_Scope;
1693 -- For a derived tagged type, we must ensure that all the
1694 -- primitive operations of the parent have been frozen, so that
1695 -- their addresses will be in the parent's dispatch table at the
1696 -- point it is inherited.
1702 then
1703 declare
1710 begin
1717 then
1719 Process_Flist;
1729 Process_Flist;
1731 -- If already frozen, and there are delayed aspects, this is where
1732 -- we do the visibility check for these aspects (see Sem_Ch13 spec
1733 -- for a description of how we handle aspect visibility).
1737 -- Retrieve the visibility to the discriminants in order to
1738 -- analyze properly the aspects.
1742 declare
1745 begin
1751 then
1762 -- If an incomplete type is still not frozen, this may be a
1763 -- premature freezing because of a body declaration that follows.
1764 -- Indicate where the freezing took place. Freezing will happen
1765 -- if the body comes from source, but not if it is internally
1766 -- generated, for example as the body of a type invariant.
1768 -- If the freezing is caused by the end of the current declarative
1769 -- part, it is a Taft Amendment type, and there is no error.
1773 then
1774 declare
1777 begin
1778 -- The presence of a body freezes all entities previously
1779 -- declared in the current list of declarations, but this
1780 -- does not apply if the body does not come from source.
1781 -- A type invariant is transformed into a subprogram body
1782 -- which is placed at the end of the private part of the
1783 -- current package, but this body does not freeze incomplete
1784 -- types that may be declared in this private part.
1787 N_Entry_Body,
1788 N_Package_Body,
1789 N_Protected_Body,
1790 N_Task_Body)
1792 and then
1795 then
1797 Error_Msg_NE
1808 -- Start of processing for Freeze_All
1810 begin
1813 -- Now that all types are frozen, we can deal with default expressions
1814 -- that require us to build a default expression functions. This is the
1815 -- point at which such functions are constructed (after all types that
1816 -- might be used in such expressions have been frozen).
1818 -- For subprograms that are renaming_as_body, we create the wrapper
1819 -- bodies as needed.
1821 -- We also add finalization chains to access types whose designated
1822 -- types are controlled. This is normally done when freezing the type,
1823 -- but this misses recursive type definitions where the later members
1824 -- of the recursion introduce controlled components.
1826 -- Loop through entities
1841 else
1847 and then
1849 = N_Subprogram_Renaming_Declaration
1850 then
1851 Build_And_Analyze_Renamed_Body
1858 N_Single_Task_Declaration)
1859 then
1860 declare
1863 begin
1868 then
1877 -- Historical note: We used to create a finalization master for an
1878 -- access type whose designated type is not controlled, but contains
1879 -- private controlled compoments. This form of postprocessing is no
1880 -- longer needed because the finalization master is now created when
1881 -- the access type is frozen (see Exp_Ch3.Freeze_Type).
1887 -----------------------
1888 -- Freeze_And_Append --
1889 -----------------------
1891 procedure Freeze_And_Append
1895 is
1897 begin
1901 else
1907 -------------------
1908 -- Freeze_Before --
1909 -------------------
1914 begin
1924 -------------------
1925 -- Freeze_Entity --
1926 -------------------
1937 -- This flag gets set to true for a variable with default initialization
1940 -- Used to detect attempt to freeze function declared in another unit
1943 -- List of freezing actions, left at No_List if none
1946 -- This could use a comment ???
1949 -- N is a freezing action to be appended to the Result
1952 -- If Loc is a freeze_entity that appears after the last declaration
1953 -- in the scope, inhibit error messages on late completion.
1956 -- Check that an Access or Unchecked_Access attribute with a prefix
1957 -- which is the current instance type can only be applied when the type
1958 -- is limited.
1961 -- Give warning for modulus of 8, 16, 32, or 64 given as an explicit
1962 -- integer literal without an explicit corresponding size clause. The
1963 -- caller has checked that Utype is a modular integer type.
1966 -- Freeze array type, including freezing index and component types
1969 -- Perform checks and generate freeze node if needed for a constant or
1970 -- variable declared by an object declaration.
1973 -- Create Freeze_Generic_Entity nodes for types declared in a generic
1974 -- package. Recurse on inner generic packages.
1977 -- Freeze formals and return type of subprogram. If some type in the
1978 -- profile is a limited view, freezing of the entity will take place
1979 -- elsewhere, and the function returns False. This routine will be
1980 -- modified if and when we can implement AI05-019 efficiently ???
1983 -- Freeze record type, including freezing component types, and freezing
1984 -- primitive operations if this is a tagged type.
1987 -- Determine whether an arbitrary entity is subject to Boolean aspect
1988 -- Import and its value is specified as True.
1991 -- Following AI05-151, a function can return a limited view of a type
1992 -- declared elsewhere. In that case the function cannot be frozen at
1993 -- the end of its enclosing package. If its first use is in a different
1994 -- unit, it cannot be frozen there, but if the call is legal the full
1995 -- view of the return type is available and the subprogram can now be
1996 -- frozen. However the freeze node cannot be inserted at the point of
1997 -- call, but rather must go in the package holding the function, so that
1998 -- the backend can process it in the proper context.
2001 -- If E is an entity for an imported subprogram with pre/post-conditions
2002 -- then this procedure will create a wrapper to ensure that proper run-
2003 -- time checking of the pre/postconditions. See body for details.
2005 -------------------
2006 -- Add_To_Result --
2007 -------------------
2010 begin
2013 else
2018 ----------------------------
2019 -- After_Last_Declaration --
2020 ----------------------------
2025 begin
2031 else
2035 else
2040 ----------------------------
2041 -- Check_Current_Instance --
2042 ----------------------------
2047 -- Determine whether Typ is compatible with the rules for aliased
2048 -- views of types as defined in RM 3.10 in the various dialects.
2051 -- Process routine to apply check to given node
2053 -----------------------------
2054 -- Is_Aliased_View_Of_Type --
2055 -----------------------------
2060 begin
2061 -- Common case
2065 then
2068 -- The following paragraphs describe what a legal aliased view of
2069 -- a type is in the various dialects of Ada.
2071 -- Ada 95
2073 -- The current instance of a limited type, and a formal parameter
2074 -- or generic formal object of a tagged type.
2076 -- Ada 95 limited type
2077 -- * Type with reserved word "limited"
2078 -- * A protected or task type
2079 -- * A composite type with limited component
2084 -- Ada 2005
2086 -- The current instance of a limited tagged type, a protected
2087 -- type, a task type, or a type that has the reserved word
2088 -- "limited" in its full definition ... a formal parameter or
2089 -- generic formal object of a tagged type.
2091 -- Ada 2005 limited type
2092 -- * Type with reserved word "limited", "synchronized", "task"
2093 -- or "protected"
2094 -- * A composite type with limited component
2095 -- * A derived type whose parent is a non-interface limited type
2098 return
2100 or else
2105 -- Ada 2012 and beyond
2107 -- The current instance of an immutably limited type ... a formal
2108 -- parameter or generic formal object of a tagged type.
2110 -- Ada 2012 limited type
2111 -- * Type with reserved word "limited", "synchronized", "task"
2112 -- or "protected"
2113 -- * A composite type with limited component
2114 -- * A derived type whose parent is a non-interface limited type
2115 -- * An incomplete view
2117 -- Ada 2012 immutably limited type
2118 -- * Explicitly limited record type
2119 -- * Record extension with "limited" present
2120 -- * Non-formal limited private type that is either tagged
2121 -- or has at least one access discriminant with a default
2122 -- expression
2123 -- * Task type, protected type or synchronized interface
2124 -- * Type derived from immutably limited type
2126 else
2127 return
2133 -------------
2134 -- Process --
2135 -------------
2138 begin
2142 Name_Unchecked_Access)
2146 then
2148 Error_Msg_N
2151 else
2152 Error_Msg_N
2159 else
2169 -- Local variables
2174 -- Start of processing for Check_Current_Instance
2176 begin
2182 ------------------------------
2183 -- Check_Suspicious_Modulus --
2184 ------------------------------
2189 begin
2195 declare
2198 begin
2200 declare
2204 begin
2206 declare
2210 begin
2211 -- First case, modulus and size are the same. This
2212 -- happens if you have something like mod 32, with
2213 -- an explicit size of 32, this is for sure a case
2214 -- where the warning is given, since it is seems
2215 -- very unlikely that someone would want e.g. a
2216 -- five bit type stored in 32 bits. It is much
2217 -- more likely they wanted a 32-bit type.
2222 -- Second case, the modulus is 32 or 64 and no
2223 -- size clause is present. This is a less clear
2224 -- case for giving the warning, but in the case
2225 -- of 32/64 (5-bit or 6-bit types) these seem rare
2226 -- enough that it is a likely error (and in any
2227 -- case using 2**5 or 2**6 in these cases seems
2228 -- clearer. We don't include 8 or 16 here, simply
2229 -- because in practice 3-bit and 4-bit types are
2230 -- more common and too many false positives if
2231 -- we warn in these cases.
2235 then
2238 -- No warning needed
2240 else
2244 -- If we fall through, give warning
2247 Error_Msg_N
2249 Modulus);
2258 -----------------------
2259 -- Freeze_Array_Type --
2260 -----------------------
2268 -- Set true if any of the index types is an enumeration type with a
2269 -- non-standard representation.
2271 begin
2280 then
2287 -- Processing that is done only for base types
2291 -- Deal with default setting of reverse storage order
2295 -- Propagate flags for component type
2299 then
2307 -- Warn for pragma Pack overriding foreign convention
2311 then
2312 declare
2317 begin
2321 Error_Msg_N
2324 Error_Msg_N
2331 -- If packing was requested or if the component size was
2332 -- set explicitly, then see if bit packing is required. This
2333 -- processing is only done for base types, since all of the
2334 -- representation aspects involved are type-related.
2336 -- This is not just an optimization, if we start processing the
2337 -- subtypes, they interfere with the settings on the base type
2338 -- (this is because Is_Packed has a slightly different meaning
2339 -- before and after freezing).
2341 declare
2345 begin
2349 then
2358 else
2361 -- We can set the component size if it is less than 16,
2362 -- rounding it up to the next storage unit size.
2368 else
2372 -- Set component size up to match alignment if it would
2373 -- otherwise be less than the alignment. This deals with
2374 -- cases of types whose alignment exceeds their size (the
2375 -- padded type cases).
2378 declare
2380 begin
2388 -- Case of component size that may result in packing
2391 declare
2397 Get_Attribute_Definition_Clause
2400 begin
2401 -- Warn if we have pack and component size so that the
2402 -- pack is ignored.
2404 -- Note: here we must check for the presence of a
2405 -- component size before checking for a Pack pragma to
2406 -- deal with the case where the array type is a derived
2407 -- type whose parent is currently private.
2411 and then Warn_On_Redundant_Constructs
2412 then
2414 Error_Msg_NE
2416 Error_Msg_N
2422 -- Set component size if not already set by a component
2423 -- size clause.
2429 -- Check for base type of 8, 16, 32 bits, where an
2430 -- unsigned subtype has a length one less than the
2431 -- base type (e.g. Natural subtype of Integer).
2433 -- In such cases, if a component size was not set
2434 -- explicitly, then generate a warning.
2440 then
2444 Error_Msg_N
2446 Pack_Pragma);
2447 Error_Msg_N
2449 Pack_Pragma);
2453 -- Actual packing is not needed for 8, 16, 32, 64. Also
2454 -- not needed for 24 if alignment is 1.
2461 then
2462 -- Here the array was requested to be packed, but
2463 -- the packing request had no effect, so Is_Packed
2464 -- is reset.
2466 -- Note: semantically this means that we lose track
2467 -- of the fact that a derived type inherited a pragma
2468 -- Pack that was non- effective, but that seems fine.
2470 -- We regard a Pack pragma as a request to set a
2471 -- representation characteristic, and this request
2472 -- may be ignored.
2479 then
2483 -- In all other cases, packing is indeed needed
2485 else
2494 -- Check for Aliased or Atomic_Components/Atomic/VFA with
2495 -- unsuitable packing or explicit component size clause given.
2500 and then
2502 then
2506 -- Outputs error messages for incorrect CS clause or pragma
2507 -- Pack for aliased or atomic/VFA components (T is "aliased"
2508 -- or "atomic/vfa");
2510 -----------------
2511 -- Complain_CS --
2512 -----------------
2515 begin
2517 Clause :=
2518 Get_Attribute_Definition_Clause
2521 Error_Msg_N
2525 Error_Msg_N
2528 else
2529 Error_Msg_N
2535 -- Start of processing for Alias_Atomic_Check
2537 begin
2538 -- If object size of component type isn't known, we cannot
2539 -- be sure so we defer to the back end.
2544 -- Case where component size has no effect. First check for
2545 -- object size of component type multiple of the storage
2546 -- unit size.
2550 -- OK in both packing case and component size case if RM
2551 -- size is known and static and same as the object size.
2553 and then
2557 -- Or if we have an explicit component size clause and
2558 -- the component size and object size are equal.
2560 or else
2563 then
2571 then
2580 -- Check for Independent_Components/Independent with unsuitable
2581 -- packing or explicit component size clause given.
2584 and then
2586 then
2587 begin
2588 -- If object size of component type isn't known, we cannot
2589 -- be sure so we defer to the back end.
2594 -- Case where component size has no effect. First check for
2595 -- object size of component type multiple of the storage
2596 -- unit size.
2600 -- OK in both packing case and component size case if RM
2601 -- size is known and multiple of the storage unit size.
2603 and then
2607 -- Or if we have an explicit component size clause and
2608 -- the component size is larger than the object size.
2610 or else
2613 then
2616 else
2618 Clause :=
2619 Get_Attribute_Definition_Clause
2622 Error_Msg_N
2626 Error_Msg_N
2629 else
2630 Error_Msg_N
2638 -- Warn for case of atomic type
2644 then
2645 Error_Msg_NE
2660 -- Check for scalar storage order
2662 declare
2664 begin
2665 Check_Component_Storage_Order
2668 ADC => Get_Attribute_Definition_Clause
2670 Attribute_Scalar_Storage_Order),
2674 -- Processing that is done only for subtypes
2676 else
2677 -- Acquire alignment from base type
2685 -- Specific checks for bit-packed arrays
2689 -- Check number of elements for bit packed arrays that come from
2690 -- source and have compile time known ranges. The bit-packed
2691 -- arrays circuitry does not support arrays with more than
2692 -- Integer'Last + 1 elements, and when this restriction is
2693 -- violated, causes incorrect data access.
2695 -- For the case where this is not compile time known, a run-time
2696 -- check should be generated???
2699 declare
2705 begin
2711 -- Never generate an error if any index is of a generic
2712 -- type. We will check this in instances.
2719 Ilen :=
2725 -- No attempt is made to check number of elements if not
2726 -- compile time known.
2739 then
2740 Error_Msg_N
2747 -- Check size
2750 declare
2754 begin
2755 -- It is not clear if it is possible to have no size clause
2756 -- at this stage, but it is not worth worrying about. Post
2757 -- error on the entity name in the size clause if present,
2758 -- else on the type entity itself.
2762 else
2769 -- If any of the index types was an enumeration type with a non-
2770 -- standard rep clause, then we indicate that the array type is
2771 -- always packed (even if it is not bit packed).
2780 -- If the array is packed, we must create the packed array type to be
2781 -- used to actually implement the type. This is only needed for real
2782 -- array types (not for string literal types, since they are present
2783 -- only for the front end).
2787 then
2791 -- Make sure that we have the necessary routines to implement the
2792 -- packing, and complain now if not. Note that we only test this
2793 -- for constrained array types.
2799 then
2800 declare
2804 begin
2807 then
2808 Error_Msg_CRT
2812 -- Cancel the packing
2822 -- Size information of packed array type is copied to the array
2823 -- type, since this is really the representation. But do not
2824 -- override explicit existing size values. If the ancestor subtype
2825 -- is constrained the Packed_Array_Impl_Type will be inherited
2826 -- from it, but the size may have been provided already, and
2827 -- must not be overridden either.
2830 and then
2833 then
2845 -- For non-packed arrays set the alignment of the array to the
2846 -- alignment of the component type if it is unknown. Skip this
2847 -- in atomic/VFA case (atomic/VFA arrays may need larger alignments).
2856 then
2860 -- A Ghost type cannot have a component of protected or task type
2861 -- (SPARK RM 6.9(19)).
2864 Error_Msg_N
2866 Arr);
2870 -------------------------------
2871 -- Freeze_Object_Declaration --
2872 -------------------------------
2875 begin
2876 -- Abstract type allowed only for C++ imported variables or constants
2878 -- Note: we inhibit this check for objects that do not come from
2879 -- source because there is at least one case (the expansion of
2880 -- x'Class'Input where x is abstract) where we legitimately
2881 -- generate an abstract object.
2886 then
2891 Error_Msg_NE
2896 Error_Msg_N -- CODEFIX
2902 -- For object created by object declaration, perform required
2903 -- categorization (preelaborate and pure) checks. Defer these
2904 -- checks to freeze time since pragma Import inhibits default
2905 -- initialization and thus pragma Import affects these checks.
2909 -- If there is an address clause, check that it is valid
2910 -- and if need be move initialization to the freeze node.
2914 -- Similar processing is needed for aspects that may affect
2915 -- object layout, like Alignment, if there is an initialization
2916 -- expression.
2919 and then Expander_Active
2922 then
2923 declare
2927 begin
2929 -- Capture initialization value at point of declaration, and
2930 -- make explicit assignment legal, because object may be a
2931 -- constant.
2936 -- Move initialization to freeze actions.
2944 -- Set_Is_Frozen (E, False);
2948 -- Reset Is_True_Constant for non-constant aliased object. We
2949 -- consider that the fact that a non-constant object is aliased may
2950 -- indicate that some funny business is going on, e.g. an aliased
2951 -- object is passed by reference to a procedure which captures the
2952 -- address of the object, which is later used to assign a new value,
2953 -- even though the compiler thinks that it is not modified. Such
2954 -- code is highly dubious, but we choose to make it "work" for
2955 -- non-constant aliased objects.
2957 -- Note that we used to do this for all aliased objects, whether or
2958 -- not constant, but this caused anomalies down the line because we
2959 -- ended up with static objects that were not Is_True_Constant. Not
2960 -- resetting Is_True_Constant for (aliased) constant objects ensures
2961 -- that this anomaly never occurs.
2963 -- However, we don't do that for internal entities. We figure that if
2964 -- we deliberately set Is_True_Constant for an internal entity, e.g.
2965 -- a dispatch table entry, then we mean it.
2970 then
2974 -- If the object needs any kind of default initialization, an error
2975 -- must be issued if No_Default_Initialization applies. The check
2976 -- doesn't apply to imported objects, which are not ever default
2977 -- initialized, and is why the check is deferred until freezing, at
2978 -- which point we know if Import applies. Deferred constants are also
2979 -- exempted from this test because their completion is explicit, or
2980 -- through an import pragma.
2988 and then
2992 or else
2995 then
2997 Check_Restriction
3001 -- Check that a Thread_Local_Storage variable does not have
3002 -- default initialization, and any explicit initialization must
3003 -- either be the null constant or a static constant.
3006 declare
3008 begin
3009 if Has_Default_Initialization
3010 or else
3012 and then
3014 or else not
3017 then
3018 Error_Msg_NE
3021 Error_Msg_NE
3028 -- For imported objects, set Is_Public unless there is also an
3029 -- address clause, which means that there is no external symbol
3030 -- needed for the Import (Is_Public may still be set for other
3031 -- unrelated reasons). Note that we delayed this processing
3032 -- till freeze time so that we can be sure not to set the flag
3033 -- if there is an address clause. If there is such a clause,
3034 -- then the only purpose of the Import pragma is to suppress
3035 -- implicit initialization.
3041 -- For source objects that are not Imported and are library
3042 -- level, if no linker section pragma was given inherit the
3043 -- appropriate linker section from the corresponding type.
3049 then
3050 Set_Linker_Section_Pragma
3054 -- For convention C objects of an enumeration type, warn if the
3055 -- size is not integer size and no explicit size given. Skip
3056 -- warning for Boolean, and Character, assume programmer expects
3057 -- 8-bit sizes for these cases.
3060 or else
3067 then
3069 Error_Msg_N
3075 -----------------------------
3076 -- Freeze_Generic_Entities --
3077 -----------------------------
3084 begin
3103 --------------------
3104 -- Freeze_Profile --
3105 --------------------
3112 begin
3113 -- Loop through formals
3119 -- AI05-0151: incomplete types can appear in a profile. By the
3120 -- time the entity is frozen, the full view must be available,
3121 -- unless it is a limited view.
3126 then
3140 then
3141 -- If the type of a formal is incomplete, subprogram is being
3142 -- frozen prematurely. Within an instance (but not within a
3143 -- wrapper package) this is an artifact of our need to regard
3144 -- the end of an instantiation as a freeze point. Otherwise it
3145 -- is a definite error.
3152 elsif not After_Last_Declaration
3153 and then not Freezing_Library_Level_Tagged_Type
3154 then
3156 Error_Msg
3161 -- Check suspicious parameter for C function. These tests apply
3162 -- only to exported/imported subprograms.
3164 if Warn_On_Export_Import
3167 or else
3174 then
3175 -- Qualify mention of formals with subprogram name
3179 -- Check suspicious use of fat C pointer
3183 then
3184 Error_Msg_N
3187 -- Check suspicious return of boolean
3193 then
3194 Error_Msg_N
3196 Error_Msg_N
3200 -- Check suspicious tagged type
3203 or else
3207 then
3208 Error_Msg_N
3212 -- Check wrong convention subprogram pointer
3216 then
3217 Error_Msg_N
3221 Error_Msg_NE
3226 -- Turn off name qualification after message output
3231 -- Check for unconstrained array in exported foreign convention
3232 -- case.
3238 and then Warn_On_Export_Import
3239 then
3242 -- If this is an inherited operation, place the warning on
3243 -- the derived type declaration, rather than on the original
3244 -- subprogram.
3247 then
3253 else
3269 -- If the formal is an anonymous_access_to_subprogram
3270 -- freeze the subprogram type as well, to prevent
3271 -- scope anomalies in gigi, because there is no other
3272 -- clear point at which it could be frozen.
3276 then
3284 -- Case of function: similar checks on return type
3288 -- Check whether function is declared elsewhere.
3290 Late_Freezing :=
3295 -- Freeze return type
3299 -- AI05-0151: the return type may have been incomplete
3300 -- at the point of declaration. Replace it with the full
3301 -- view, unless the current type is a limited view. In
3302 -- that case the full view is in a different unit, and
3303 -- gigi finds the non-limited view after the other unit
3304 -- is elaborated.
3309 then
3313 -- If the return type is a limited view and the non-limited
3314 -- view is still incomplete, the function has to be frozen at a
3315 -- later time. If the function is abstract there is no place at
3316 -- which the full view will become available, and no code to be
3317 -- generated for it, so mark type as frozen.
3322 then
3325 else
3334 -- Check suspicious return type for C function
3336 if Warn_On_Export_Import
3338 or else
3341 then
3342 -- Check suspicious return of fat C pointer
3348 then
3352 -- Check suspicious return of boolean
3359 then
3360 declare
3363 begin
3364 Error_Msg_NE
3366 Error_Msg_NE
3371 -- Check suspicious return tagged type
3375 and then
3376 Is_Tagged_Type
3381 then
3385 -- Check return of wrong convention subprogram pointer
3391 then
3395 Error_Msg_NE
3401 -- Give warning for suspicious return of a result of an
3402 -- unconstrained array type in a foreign convention function.
3406 -- We are looking for a return of unconstrained array
3411 -- Exclude imported routines, the warning does not belong on
3412 -- the import, but rather on the routine definition.
3416 -- Check that general warning is enabled, and that it is not
3417 -- suppressed for this particular case.
3419 and then Warn_On_Export_Import
3422 then
3423 Error_Msg_N
3429 -- Check suspicious use of Import in pure unit (cases where the RM
3430 -- allows calls to be omitted).
3434 -- It might be suspicious if the compilation unit has the Pure
3435 -- aspect/pragma.
3439 -- The RM allows omission of calls only in the case of
3440 -- library-level subprograms (see RM-10.2.1(18)).
3444 -- Ignore internally generated entity. This happens in some cases
3445 -- of subprograms in specs, where we generate an implied body.
3449 -- Assume run-time knows what it is doing
3451 and then not GNAT_Mode
3453 -- Assume explicit Pure_Function means import is pure
3457 -- Don't need warning in relaxed semantics mode
3459 and then not Relaxed_RM_Semantics
3461 -- Assume convention Intrinsic is OK, since this is specialized.
3462 -- This deals with the DEC unit current_exception.ads
3466 -- Assume that ASM interface knows what it is doing. This deals
3467 -- with unsigned.ads in the AAMP back end.
3470 then
3471 Error_Msg_N
3473 Error_Msg_NE
3481 ------------------------
3482 -- Freeze_Record_Type --
3483 ------------------------
3495 -- Set True if the record type scope Rec has been pushed on the scope
3496 -- stack. Needed for the analysis of delayed aspects specified to the
3497 -- components of Rec.
3500 -- Scalar_Storage_Order attribute definition clause for the record
3503 -- Set True if we find at least one component with no component
3504 -- clause (used to warn about useless Pack pragmas).
3507 -- Set True if we find at least one component with a component
3508 -- clause (used to warn about useless Bit_Order pragmas, and also
3509 -- to detect cases where Implicit_Packing may have an effect).
3512 -- Set True if we find at least one component which is aliased. This
3513 -- is used to prevent Implicit_Packing of the record, since packing
3514 -- cannot modify the size of alignment of an aliased component.
3517 -- Set True if we find at least one component whose type has a
3518 -- Scalar_Storage_Order attribute definition clause.
3521 -- Set False if we encounter a component of a non-scalar type
3525 -- Accumulates total RM_Size values and total Esize values of all
3526 -- scalar components. Used for processing of Implicit_Packing.
3529 -- If N is an allocator, possibly wrapped in one or more level of
3530 -- qualified expression(s), return the inner allocator node, else
3531 -- return Empty.
3534 -- If the component subtype is an access to a constrained subtype of
3535 -- an already frozen type, make the subtype frozen as well. It might
3536 -- otherwise be frozen in the wrong scope, and a freeze node on
3537 -- subtype has no effect. Similarly, if the component subtype is a
3538 -- regular (not protected) access to subprogram, set the anonymous
3539 -- subprogram type to frozen as well, to prevent an out-of-scope
3540 -- freeze node at some eventual point of call. Protected operations
3541 -- are handled elsewhere.
3544 -- Make sure that all types mentioned in Discrete_Choices of the
3545 -- variants referenceed by the Variant_Part VP are frozen. This is
3546 -- a recursive routine to deal with nested variants.
3548 ---------------------
3549 -- Check_Allocator --
3550 ---------------------
3554 begin
3556 loop
3561 else
3567 -----------------
3568 -- Check_Itype --
3569 -----------------
3574 begin
3577 then
3580 -- In addition, add an Itype_Reference to ensure that the
3581 -- access subtype is elaborated early enough. This cannot be
3582 -- done if the subtype may depend on discriminants.
3587 then
3595 then
3600 ------------------------------------
3601 -- Freeze_Choices_In_Variant_Part --
3602 ------------------------------------
3611 begin
3612 -- Loop through variants
3617 -- Loop through choices, checking that all types are frozen
3623 then
3630 -- Check for nested variant part to process
3644 -- Start of processing for Freeze_Record_Type
3646 begin
3647 -- Deal with delayed aspect specifications for components. The
3648 -- analysis of the aspect is required to be delayed to the freeze
3649 -- point, thus we analyze the pragma or attribute definition
3650 -- clause in the tree at this point. We also analyze the aspect
3651 -- specification node at the freeze point when the aspect doesn't
3652 -- correspond to pragma/attribute definition clause.
3658 then
3663 -- The visibility to the discriminants must be restored in
3664 -- order to properly analyze the aspects.
3677 -- Pop the scope if Rec scope has been pushed on the scope stack
3678 -- during the delayed aspect analysis process.
3685 Pop_Scope;
3688 -- Freeze components and embedded subtypes
3697 -- Handle the component and discriminant case
3700 declare
3703 begin
3704 -- Freezing a record type freezes the type of each of its
3705 -- components. However, if the type of the component is
3706 -- part of this record, we do not want or need a separate
3707 -- Freeze_Node. Note that Is_Itype is wrong because that's
3708 -- also set in private type cases. We also can't check for
3709 -- the Scope being exactly Rec because of private types and
3710 -- record extensions.
3715 then
3721 -- Warn for pragma Pack overriding foreign convention
3726 -- Don't warn for aliased components, since override
3727 -- cannot happen in that case.
3730 then
3731 declare
3736 begin
3740 Error_Msg_N
3742 PP);
3744 Error_Msg_NE
3751 -- Check for error of component clause given for variable
3752 -- sized type. We have to delay this test till this point,
3753 -- since the component type has to be frozen for us to know
3754 -- if it is variable length.
3759 -- We omit this test in a generic context, it will be
3760 -- applied at instantiation time.
3765 -- Also omit this test in CodePeer mode, since we do not
3766 -- have sufficient info on size and rep clauses.
3771 -- Omit check if component has a generic type. This can
3772 -- happen in an instantiation within a generic in ASIS
3773 -- mode, where we force freeze actions without full
3774 -- expansion.
3779 -- Do the check
3781 elsif not
3782 Size_Known_At_Compile_Time
3784 then
3785 Error_Msg_N
3790 else
3794 -- Case of component requires byte alignment
3798 -- Set the enclosing record to also require byte align
3802 -- Check for component clause that is inconsistent with
3803 -- the required byte boundary alignment.
3808 then
3809 Error_Msg_N
3817 -- Gather data for possible Implicit_Packing later. Note that at
3818 -- this stage we might be dealing with a real component, or with
3819 -- an implicit subtype declaration.
3823 else
3824 Scalar_Component_Total_RM_Size :=
3826 Scalar_Component_Total_Esize :=
3830 -- If the component is an Itype with Delayed_Freeze and is either
3831 -- a record or array subtype and its base type has not yet been
3832 -- frozen, we must remove this from the entity list of this record
3833 -- and put it on the entity list of the scope of its base type.
3834 -- Note that we know that this is not the type of a component
3835 -- since we cleared Has_Delayed_Freeze for it in the previous
3836 -- loop. Thus this must be the Designated_Type of an access type,
3837 -- which is the type of a component.
3845 then
3846 declare
3850 begin
3851 -- We have a difficult case to handle here. Suppose Rec is
3852 -- subtype being defined in a subprogram that's created as
3853 -- part of the freezing of Rec'Base. In that case, we know
3854 -- that Comp'Base must have already been frozen by the time
3855 -- we get to elaborate this because Gigi doesn't elaborate
3856 -- any bodies until it has elaborated all of the declarative
3857 -- part. But Is_Frozen will not be set at this point because
3858 -- we are processing code in lexical order.
3860 -- We detect this case by going up the Scope chain of Rec
3861 -- and seeing if we have a subprogram scope before reaching
3862 -- the top of the scope chain or that of Comp'Base. If we
3863 -- do, then mark that Comp'Base will actually be frozen. If
3864 -- so, we merely undelay it.
3881 else
3884 else
3888 -- Insert in entity list of scope of base type (which
3889 -- must be an enclosing scope, because still unfrozen).
3895 -- If the component is an access type with an allocator as default
3896 -- value, the designated type will be frozen by the corresponding
3897 -- expression in init_proc. In order to place the freeze node for
3898 -- the designated type before that for the current record type,
3899 -- freeze it now.
3901 -- Same process if the component is an array of access types,
3902 -- initialized with an aggregate. If the designated type is
3903 -- private, it cannot contain allocators, and it is premature
3904 -- to freeze the type, so we check for this as well.
3909 then
3910 declare
3914 begin
3917 -- If component is pointer to a class-wide type, freeze
3918 -- the specific type in the expression being allocated.
3919 -- The expression may be a subtype indication, in which
3920 -- case freeze the subtype mark.
3922 if Is_Class_Wide_Type
3924 then
3926 Freeze_And_Append
3930 then
3931 Freeze_And_Append
3939 else
3940 Freeze_And_Append
3948 then
3951 -- Freeze the designated type when initializing a component with
3952 -- an aggregate in case the aggregate contains allocators.
3954 -- type T is ...;
3955 -- type T_Ptr is access all T;
3956 -- type T_Array is array ... of T_Ptr;
3958 -- type Rec is record
3959 -- Comp : T_Array := (others => ...);
3960 -- end record;
3964 then
3965 declare
3968 Designated_Type
3971 begin
3972 -- The only case when this sort of freezing is not done is
3973 -- when the designated type is class-wide and the root type
3974 -- is the record owning the component. This scenario results
3975 -- in a circularity because the class-wide type requires
3976 -- primitives that have not been created yet as the root
3977 -- type is in the process of being frozen.
3979 -- type Rec is tagged;
3980 -- type Rec_Ptr is access all Rec'Class;
3981 -- type Rec_Array is array ... of Rec_Ptr;
3983 -- type Rec is record
3984 -- Comp : Rec_Array := (others => ...);
3985 -- end record;
3989 then
3997 then
4007 SSO_ADC :=
4008 Get_Attribute_Definition_Clause
4011 -- If the record type has Complex_Representation, then it is treated
4012 -- as a scalar in the back end so the storage order is irrelevant.
4016 Error_Msg_N
4018 SSO_ADC);
4021 else
4022 -- Deal with default setting of reverse storage order
4026 -- Check consistent attribute setting on component types
4028 declare
4030 begin
4033 Check_Component_Storage_Order
4043 -- Now deal with reverse storage order/bit order issues
4047 -- Check compatibility of Scalar_Storage_Order with Bit_Order,
4048 -- if the former is specified.
4052 -- Note: report error on Rec, not on SSO_ADC, as ADC may
4053 -- apply to some ancestor type.
4056 Error_Msg_N
4061 -- Warn if there is a Scalar_Storage_Order attribute definition
4062 -- clause but no component clause, no component that itself has
4063 -- such an attribute definition, and no pragma Pack.
4066 or else
4067 SSO_ADC_Component
4068 or else
4070 then
4071 Error_Msg_N
4078 -- Deal with Bit_Order aspect
4086 then
4087 -- Warn if clause has no effect when no component clause is
4088 -- present, but suppress warning if the Bit_Order is required
4089 -- due to the presence of a Scalar_Storage_Order attribute.
4091 Error_Msg_N
4093 Error_Msg_N
4096 -- Here is where we do the processing to adjust component clauses
4097 -- for reversed bit order, when not using reverse SSO.
4101 then
4104 -- Case where we have both an explicit Bit_Order and the same
4105 -- Scalar_Storage_Order: leave record untouched, the back-end
4106 -- will take care of required layout conversions.
4108 else
4114 -- Complete error checking on record representation clause (e.g.
4115 -- overlap of components). This is called after adjusting the
4116 -- record for reverse bit order.
4118 declare
4120 begin
4126 -- Set OK_To_Reorder_Components depending on debug flags
4130 or else
4132 then
4137 -- Check for useless pragma Pack when all components placed. We only
4138 -- do this check for record types, not subtypes, since a subtype may
4139 -- have all its components placed, and it still makes perfectly good
4140 -- sense to pack other subtypes or the parent type. We do not give
4141 -- this warning if Optimize_Alignment is set to Space, since the
4142 -- pragma Pack does have an effect in this case (it always resets
4143 -- the alignment to one).
4147 and then not Unplaced_Component
4149 then
4150 -- Reset packed status. Probably not necessary, but we do it so
4151 -- that there is no chance of the back end doing something strange
4152 -- with this redundant indication of packing.
4156 -- Give warning if redundant constructs warnings on
4159 Error_Msg_N -- CODEFIX
4165 -- If this is the record corresponding to a remote type, freeze the
4166 -- remote type here since that is what we are semantically freezing.
4167 -- This prevents the freeze node for that type in an inner scope.
4174 -- Check for controlled components and unchecked unions.
4179 -- Do not set Has_Controlled_Component on a class-wide
4180 -- equivalent type. See Make_CW_Equivalent_Type.
4183 and then
4185 or else
4188 or else
4190 and then
4192 and then
4193 Has_Controlled_Component
4195 then
4203 -- Scan component declaration for likely misuses of current
4204 -- instance, either in a constraint or a default expression.
4214 -- Enforce the restriction that access attributes with a current
4215 -- instance prefix can only apply to limited types. This comment
4216 -- is floating here, but does not seem to belong here???
4218 -- Set component alignment if not otherwise already set
4222 -- For first subtypes, check if there are any fixed-point fields with
4223 -- component clauses, where we must check the size. This is not done
4224 -- till the freeze point since for fixed-point types, we do not know
4225 -- the size until the type is frozen. Similar processing applies to
4226 -- bit packed arrays.
4234 then
4235 Check_Size
4239 Junk);
4246 -- Generate warning for applying C or C++ convention to a record
4247 -- with discriminants. This is suppressed for the unchecked union
4248 -- case, since the whole point in this case is interface C. We also
4249 -- do not generate this within instantiations, since we will have
4250 -- generated a message on the template.
4255 or else
4258 and then not In_Instance
4261 then
4262 declare
4266 begin
4271 Error_Msg_N
4273 A2);
4274 else
4275 Error_Msg_N
4277 A2);
4280 Error_Msg_NE
4286 -- See if Size is too small as is (and implicit packing might help)
4290 -- No implicit packing if even one component is explicitly placed
4292 and then not Placed_Component
4294 -- Or even one component is aliased
4296 and then not Aliased_Component
4298 -- Must have size clause and all scalar components
4301 and then All_Scalar_Components
4303 -- Do not try implicit packing on records with discriminants, too
4304 -- complicated, especially in the variant record case.
4308 -- We can implicitly pack if the specified size of the record is
4309 -- less than the sum of the object sizes (no point in packing if
4310 -- this is not the case).
4314 -- And the total RM size cannot be greater than the specified size
4315 -- since otherwise packing will not get us where we have to be.
4319 -- Never do implicit packing in CodePeer or SPARK modes since
4320 -- we don't do any packing in these modes, since this generates
4321 -- over-complex code that confuses static analysis, and in
4322 -- general, neither CodePeer not GNATprove care about the
4323 -- internal representation of objects.
4326 then
4327 -- If implicit packing enabled, do it
4332 -- Otherwise flag the size clause
4334 else
4335 declare
4337 begin
4338 Error_Msg_NE -- CODEFIX
4340 Error_Msg_N -- CODEFIX
4347 -- The following checks are relevant only when SPARK_Mode is on as
4348 -- they are not standard Ada legality rules.
4353 -- A discriminated type cannot be effectively volatile
4354 -- (SPARK RM C.6(4)).
4359 -- A tagged type cannot be effectively volatile
4360 -- (SPARK RM C.6(5)).
4366 -- A non-effectively volatile record type cannot contain
4367 -- effectively volatile components (SPARK RM C.6(2)).
4369 else
4374 then
4376 Error_Msg_N
4385 -- A type which does not yield a synchronized object cannot have
4386 -- a component that yields a synchronized object (SPARK RM 9.5).
4393 then
4395 Error_Msg_N
4404 -- A Ghost type cannot have a component of protected or task type
4405 -- (SPARK RM 6.9(19)).
4412 then
4414 Error_Msg_N
4416 Comp);
4424 -- Make sure that if we have an iterator aspect, then we have
4425 -- either Constant_Indexing or Variable_Indexing.
4427 declare
4430 begin
4439 or else
4441 then
4443 else
4444 Error_Msg_N
4446 Iterator_Aspect);
4451 -- All done if not a full record definition
4457 -- Finally we need to check the variant part to make sure that
4458 -- all types within choices are properly frozen as part of the
4459 -- freezing of the record type.
4466 begin
4467 -- Find component list
4479 then
4484 -- Case of variant part present
4490 -- Note: we used to call Check_Choices here, but it is too early,
4491 -- since predicated subtypes are frozen here, but their freezing
4492 -- actions are in Analyze_Freeze_Entity, which has not been called
4493 -- yet for entities frozen within this procedure, so we moved that
4494 -- call to the Analyze_Freeze_Entity for the record type.
4498 -- Check that all the primitives of an interface type are abstract
4499 -- or null procedures.
4503 then
4504 declare
4508 begin
4515 -- Avoid reporting the error on inherited primitives
4518 then
4523 Error_Msg_N
4527 else
4528 Error_Msg_N
4540 -------------------------------
4541 -- Has_Boolean_Aspect_Import --
4542 -------------------------------
4549 begin
4555 -- The value of aspect Import is True when the expression is
4556 -- either missing or it is explicitly set to True.
4562 then
4573 ----------------------------
4574 -- Late_Freeze_Subprogram --
4575 ----------------------------
4582 begin
4585 else
4592 ------------------------------
4593 -- Wrap_Imported_Subprogram --
4594 ------------------------------
4596 -- The issue here is that our normal approach of checking preconditions
4597 -- and postconditions does not work for imported procedures, since we
4598 -- are not generating code for the body. To get around this we create
4599 -- a wrapper, as shown by the following example:
4601 -- procedure K (A : Integer);
4602 -- pragma Import (C, K);
4604 -- The spec is rewritten by removing the effects of pragma Import, but
4605 -- leaving the convention unchanged, as though the source had said:
4607 -- procedure K (A : Integer);
4608 -- pragma Convention (C, K);
4610 -- and we create a body, added to the entity K freeze actions, which
4611 -- looks like:
4613 -- procedure K (A : Integer) is
4614 -- procedure K (A : Integer);
4615 -- pragma Import (C, K);
4616 -- begin
4617 -- K (A);
4618 -- end K;
4620 -- Now the contract applies in the normal way to the outer procedure,
4621 -- and the inner procedure has no contracts, so there is no problem
4622 -- in just calling it to get the original effect.
4624 -- In the case of a function, we create an appropriate return statement
4625 -- for the subprogram body that calls the inner procedure.
4637 begin
4638 -- Nothing to do if not imported
4643 -- Test enabling conditions for wrapping
4648 and then not GNATprove_Mode
4649 then
4650 -- Here we do the wrap
4652 -- Note on calls to Copy_Separate_Tree. The trees we are copying
4653 -- here are fully analyzed, but we definitely want fully syntactic
4654 -- unanalyzed trees in the body we construct, so that the analysis
4655 -- generates the right visibility, and that is exactly what the
4656 -- calls to Copy_Separate_Tree give us.
4658 -- Acquire copy of Inline pragma, and indicate that it does not
4659 -- come from an aspect, as it applies to an internal entity.
4664 -- Fix up spec to be not imported any more
4671 -- Grab the subprogram declaration and specification
4675 -- Build parameter list that we need
4684 -- Build the call
4687 Stmt :=
4689 Expression =>
4694 else
4695 Stmt :=
4701 -- Now build the body
4703 Bod :=
4705 Specification =>
4709 Specification =>
4711 Iprag),
4712 Handled_Statement_Sequence =>
4717 -- Append the body to freeze result
4722 -- Case of imported subprogram that does not get wrapped
4724 else
4725 -- Set Is_Public. All imported entities need an external symbol
4726 -- created for them since they are always referenced from another
4727 -- object file. Note this used to be set when we set Is_Imported
4728 -- back in Sem_Prag, but now we delay it to this point, since we
4729 -- don't want to set this flag if we wrap an imported subprogram.
4735 -- Local variables
4739 -- Start of processing for Freeze_Entity
4741 begin
4742 -- The entity being frozen may be subject to pragma Ghost. Set the mode
4743 -- now to ensure that any nodes generated during freezing are properly
4744 -- flagged as Ghost.
4748 -- We are going to test for various reasons why this entity need not be
4749 -- frozen here, but in the case of an Itype that's defined within a
4750 -- record, that test actually applies to the record.
4756 then
4760 -- Do not freeze if already frozen since we only need one freeze node
4766 -- It is improper to freeze an external entity within a generic because
4767 -- its freeze node will appear in a non-valid context. The entity will
4768 -- be frozen in the proper scope after the current generic is analyzed.
4769 -- However, aspects must be analyzed because they may be queried later
4770 -- within the generic itself, and the corresponding pragma or attribute
4771 -- definition has not been analyzed yet.
4781 -- AI05-0213: A formal incomplete type does not freeze the actual. In
4782 -- the instance, the same applies to the subtype renaming the actual.
4788 then
4792 -- Formal subprograms are never frozen
4798 -- Generic types are never frozen as they lack delayed semantic checks
4804 -- Do not freeze a global entity within an inner scope created during
4805 -- expansion. A call to subprogram E within some internal procedure
4806 -- (a stream attribute for example) might require freezing E, but the
4807 -- freeze node must appear in the same declarative part as E itself.
4808 -- The two-pass elaboration mechanism in gigi guarantees that E will
4809 -- be frozen before the inner call is elaborated. We exclude constants
4810 -- from this test, because deferred constants may be frozen early, and
4811 -- must be diagnosed (e.g. in the case of a deferred constant being used
4812 -- in a default expression). If the enclosing subprogram comes from
4813 -- source, or is a generic instance, then the freeze point is the one
4814 -- mandated by the language, and we freeze the entity. A subprogram that
4815 -- is a child unit body that acts as a spec does not have a spec that
4816 -- comes from source, but can only come from source.
4821 then
4822 declare
4825 begin
4832 then
4834 else
4844 -- Similarly, an inlined instance body may make reference to global
4845 -- entities, but these references cannot be the proper freezing point
4846 -- for them, and in the absence of inlining freezing will take place in
4847 -- their own scope. Normally instance bodies are analyzed after the
4848 -- enclosing compilation, and everything has been frozen at the proper
4849 -- place, but with front-end inlining an instance body is compiled
4850 -- before the end of the enclosing scope, and as a result out-of-order
4851 -- freezing must be prevented.
4853 elsif Front_End_Inlining
4854 and then In_Instance_Body
4856 then
4857 declare
4860 begin
4865 else
4883 -- Add checks to detect proper initialization of scalars that may appear
4884 -- as subprogram parameters.
4890 -- Deal with delayed aspect specifications. The analysis of the aspect
4891 -- is required to be delayed to the freeze point, thus we analyze the
4892 -- pragma or attribute definition clause in the tree at this point. We
4893 -- also analyze the aspect specification node at the freeze point when
4894 -- the aspect doesn't correspond to pragma/attribute definition clause.
4900 -- Here to freeze the entity
4904 -- Case of entity being frozen is other than a type
4908 -- If entity is exported or imported and does not have an external
4909 -- name, now is the time to provide the appropriate default name.
4910 -- Skip this if the entity is stubbed, since we don't need a name
4911 -- for any stubbed routine. For the case on intrinsics, if no
4912 -- external name is specified, then calls will be handled in
4913 -- Exp_Intr.Expand_Intrinsic_Call, and no name is needed. If an
4914 -- external name is provided, then Expand_Intrinsic_Call leaves
4915 -- calls in place for expansion by GIGI.
4921 then
4922 Set_Encoded_Interface_Name
4925 -- If entity is an atomic object appearing in a declaration and
4926 -- the expression is an aggregate, assign it to a temporary to
4927 -- ensure that the actual assignment is done atomically rather
4928 -- than component-wise (the assignment to the temp may be done
4929 -- component-wise, but that is harmless).
4936 then
4940 -- Subprogram case
4944 -- Check for needing to wrap imported subprogram
4948 -- Freeze all parameter types and the return type (RM 13.14(14)).
4949 -- However skip this for internal subprograms. This is also where
4950 -- any extra formal parameters are created since we now know
4951 -- whether the subprogram will use a foreign convention.
4953 -- In Ada 2012, freezing a subprogram does not always freeze
4954 -- the corresponding profile (see AI05-019). An attribute
4955 -- reference is not a freezing point of the profile.
4956 -- Other constructs that should not freeze ???
4958 -- This processing doesn't apply to internal entities (see below)
4967 -- Must freeze its parent first if it is a derived subprogram
4973 -- We don't freeze internal subprograms, because we don't normally
4974 -- want addition of extra formals or mechanism setting to happen
4975 -- for those. However we do pass through predefined dispatching
4976 -- cases, since extra formals may be needed in some cases, such as
4977 -- for the stream 'Input function (build-in-place formals).
4981 then
4991 -- If warning on suspicious contracts then check for the case of
4992 -- a postcondition other than False for a No_Return subprogram.
4995 and then Warn_On_Suspicious_Contract
4997 then
4998 declare
5002 begin
5005 Name_Postcondition,
5006 Name_Refined_Post)
5007 then
5008 Exp :=
5009 Expression
5014 then
5015 Error_Msg_NE
5026 -- Here for other than a subprogram or type
5028 else
5029 -- If entity has a type, and it is not a generic unit, then
5030 -- freeze it first (RM 13.14(10)).
5034 then
5037 -- For an object of an anonymous array type, aspects on the
5038 -- object declaration apply to the type itself. This is the
5039 -- case for Atomic_Components, Volatile_Components, and
5040 -- Independent_Components. In these cases analysis of the
5041 -- generated pragma will mark the anonymous types accordingly,
5042 -- and the object itself does not require a freeze node.
5048 then
5055 -- Special processing for objects created by object declaration
5061 -- Check that a constant which has a pragma Volatile[_Components]
5062 -- or Atomic[_Components] also has a pragma Import (RM C.6(13)).
5064 -- Note: Atomic[_Components] also sets Volatile[_Components]
5070 then
5071 -- Make sure we actually have a pragma, and have not merely
5072 -- inherited the indication from elsewhere (e.g. an address
5073 -- clause, which is not good enough in RM terms).
5076 or else
5078 then
5079 Error_Msg_N
5084 or else
5086 then
5087 Error_Msg_N
5093 -- Static objects require special handling
5097 then
5101 -- Remaining step is to layout objects
5105 then
5109 -- For an object that does not have delayed freezing, and whose
5110 -- initialization actions have been captured in a compound
5111 -- statement, move them back now directly within the enclosing
5112 -- statement sequence.
5116 then
5121 -- Case of a type or subtype being frozen
5123 else
5124 -- We used to check here that a full type must have preelaborable
5125 -- initialization if it completes a private type specified with
5126 -- pragma Preelaborable_Initialization, but that missed cases where
5127 -- the types occur within a generic package, since the freezing
5128 -- that occurs within a containing scope generally skips traversal
5129 -- of a generic unit's declarations (those will be frozen within
5130 -- instances). This check was moved to Analyze_Package_Specification.
5132 -- The type may be defined in a generic unit. This can occur when
5133 -- freezing a generic function that returns the type (which is
5134 -- defined in a parent unit). It is clearly meaningless to freeze
5135 -- this type. However, if it is a subtype, its size may be determi-
5136 -- nable and used in subsequent checks, so might as well try to
5137 -- compute it.
5139 -- In Ada 2012, Freeze_Entities is also used in the front end to
5140 -- trigger the analysis of aspect expressions, so in this case we
5141 -- want to continue the freezing process.
5145 and then
5148 then
5154 -- Check for error of Type_Invariant'Class applied to an untagged
5155 -- type (check delayed to freeze time when full type is available).
5157 declare
5159 begin
5163 then
5164 Error_Msg_NE
5167 Error_Msg_N
5174 -- A Ghost type cannot be concurrent (SPARK RM 6.9(19)). Verify
5175 -- this legality rule first to five a finer-grained diagnostic.
5180 -- A Ghost type cannot be effectively volatile (SPARK RM 6.9(8))
5187 -- Deal with special cases of freezing for subtype
5191 -- Before we do anything else, a specialized test for the case of
5192 -- a size given for an array where the array needs to be packed,
5193 -- but was not so the size cannot be honored. This is the case
5194 -- where implicit packing may apply. The reason we do this so
5195 -- early is that if we have implicit packing, the layout of the
5196 -- base type is affected, so we must do this before we freeze
5197 -- the base type.
5199 -- We could do this processing only if implicit packing is enabled
5200 -- since in all other cases, the error would be caught by the back
5201 -- end. However, we choose to do the check even if we do not have
5202 -- implicit packing enabled, since this allows us to give a more
5203 -- useful error message (advising use of pragmas Implicit_Packing
5204 -- or Pack).
5207 declare
5218 -- Number of elements in array
5220 begin
5221 -- Check enabling conditions. These are straightforward
5222 -- except for the test for a limited composite type. This
5223 -- eliminates the rare case of a array of limited components
5224 -- where there are issues of whether or not we can go ahead
5225 -- and pack the array (since we can't freely pack and unpack
5226 -- arrays if they are limited).
5228 -- Note that we check the root type explicitly because the
5229 -- whole point is we are doing this test before we have had
5230 -- a chance to freeze the base type (and it is that freeze
5231 -- action that causes stuff to be inherited).
5244 then
5245 -- Compute number of elements in array
5253 and then
5255 then
5259 Num_Elmts :=
5260 Num_Elmts *
5266 -- What we are looking for here is the situation where
5267 -- the RM_Size given would be exactly right if there was
5268 -- a pragma Pack (resulting in the component size being
5269 -- the same as the RM_Size). Furthermore, the component
5270 -- type size must be an odd size (not a multiple of
5271 -- storage unit). If the component RM size is an exact
5272 -- number of storage units that is a power of two, the
5273 -- array is not packed and has a standard representation.
5277 then
5278 -- For implicit packing mode, just set the component
5279 -- size silently.
5287 -- Otherwise give an error message
5289 else
5290 Error_Msg_NE
5292 Error_Msg_N -- CODEFIX
5298 and then Implicit_Packing
5299 and then
5301 or else
5303 or else
5305 then
5306 -- Not a packed array, but indicate the desired
5307 -- component size, for the back-end.
5317 -- If ancestor subtype present, freeze that first. Note that this
5318 -- will also get the base type frozen. Need RM reference ???
5325 -- No ancestor subtype present
5327 else
5328 -- See if we have a nearest ancestor that has a predicate.
5329 -- That catches the case of derived type with a predicate.
5330 -- Need RM reference here ???
5338 -- Freeze base type before freezing the entity (RM 13.14(15))
5345 -- A subtype inherits all the type-related representation aspects
5346 -- from its parents (RM 13.1(8)).
5350 -- For a derived type, freeze its parent type first (RM 13.14(15))
5356 -- A derived type inherits each type-related representation aspect
5357 -- of its parent type that was directly specified before the
5358 -- declaration of the derived type (RM 13.1(15)).
5363 -- Check for incompatible size and alignment for record type
5365 if Warn_On_Size_Alignment
5369 -- If explicit Object_Size clause given assume that the programmer
5370 -- knows what he is doing, and expects the compiler behavior.
5374 -- Check for size not a multiple of alignment
5377 then
5378 declare
5384 begin
5387 -- Give a warning
5391 Error_Msg_NE
5398 else
5400 Error_Msg_NE
5414 -- Array type
5419 -- For a class-wide type, the corresponding specific type is
5420 -- frozen as well (RM 13.14(15))
5425 -- If the base type of the class-wide type is still incomplete,
5426 -- the class-wide remains unfrozen as well. This is legal when
5427 -- E is the formal of a primitive operation of some other type
5428 -- which is being frozen.
5436 -- The equivalent type associated with a class-wide subtype needs
5437 -- to be frozen to ensure that its layout is done.
5441 then
5445 -- Generate an itype reference for a library-level class-wide type
5446 -- at the freeze point. Otherwise the first explicit reference to
5447 -- the type may appear in an inner scope which will be rejected by
5448 -- the back-end.
5452 then
5453 declare
5456 begin
5459 -- From a gigi point of view, a class-wide subtype derives
5460 -- from its record equivalent type. As a result, the itype
5461 -- reference must appear after the freeze node of the
5462 -- equivalent type or gigi will reject the reference.
5466 then
5468 else
5474 -- For a record type or record subtype, freeze all component types
5475 -- (RM 13.14(15)). We test for E_Record_(sub)Type here, rather than
5476 -- using Is_Record_Type, because we don't want to attempt the freeze
5477 -- for the case of a private type with record extension (we will do
5478 -- that later when the full type is frozen).
5483 then
5486 -- For a concurrent type, freeze corresponding record type. This does
5487 -- not correspond to any specific rule in the RM, but the record type
5488 -- is essentially part of the concurrent type. Also freeze all local
5489 -- entities. This includes record types created for entry parameter
5490 -- blocks and whatever local entities may appear in the private part.
5504 -- The guard on the presence of the Etype seems to be needed
5505 -- for some CodePeer (-gnatcC) cases, but not clear why???
5510 then
5521 -- Private types are required to point to the same freeze node as
5522 -- their corresponding full views. The freeze node itself has to
5523 -- point to the partial view of the entity (because from the partial
5524 -- view, we can retrieve the full view, but not the reverse).
5525 -- However, in order to freeze correctly, we need to freeze the full
5526 -- view. If we are freezing at the end of a scope (or within the
5527 -- scope) of the private type, the partial and full views will have
5528 -- been swapped, the full view appears first in the entity chain and
5529 -- the swapping mechanism ensures that the pointers are properly set
5530 -- (on scope exit).
5532 -- If we encounter the partial view before the full view (e.g. when
5533 -- freezing from another scope), we freeze the full view, and then
5534 -- set the pointers appropriately since we cannot rely on swapping to
5535 -- fix things up (subtypes in an outer scope might not get swapped).
5537 -- If the full view is itself private, the above requirements apply
5538 -- to the underlying full view instead of the full view. But there is
5539 -- no swapping mechanism for the underlying full view so we need to
5540 -- set the pointers appropriately in both cases.
5544 then
5545 -- The construction of the dispatch table associated with library
5546 -- level tagged types forces freezing of all the primitives of the
5547 -- type, which may cause premature freezing of the partial view.
5548 -- For example:
5550 -- package Pkg is
5551 -- type T is tagged private;
5552 -- type DT is new T with private;
5553 -- procedure Prim (X : in out T; Y : in out DT'Class);
5554 -- private
5555 -- type T is tagged null record;
5556 -- Obj : T;
5557 -- type DT is new T with null record;
5558 -- end;
5560 -- In this case the type will be frozen later by the usual
5561 -- mechanism: an object declaration, an instantiation, or the
5562 -- end of a declarative part.
5566 then
5571 -- Case of full view present
5575 -- If full view has already been frozen, then no further
5576 -- processing is required
5582 -- Otherwise freeze full view and patch the pointers so that
5583 -- the freeze node will elaborate both views in the back end.
5584 -- However, if full view is itself private, freeze underlying
5585 -- full view instead and patch the pointers so that the freeze
5586 -- node will elaborate the three views in the back end.
5588 else
5589 declare
5592 begin
5595 then
5603 then
5610 else
5623 else
5624 -- {Incomplete,Private}_Subtypes with Full_Views
5625 -- constrained by discriminants.
5636 -- AI-117 requires that the convention of a partial view be the
5637 -- same as the convention of the full view. Note that this is a
5638 -- recognized breach of privacy, but it's essential for logical
5639 -- consistency of representation, and the lack of a rule in
5640 -- RM95 was an oversight.
5647 -- Size information is copied from the full view to the
5648 -- incomplete or private view for consistency.
5650 -- We skip this is the full view is not a type. This is very
5651 -- strange of course, and can only happen as a result of
5652 -- certain illegalities, such as a premature attempt to derive
5653 -- from an incomplete type.
5663 -- Case of underlying full view present
5667 then
5672 -- Patch the pointers so that the freeze node will elaborate
5673 -- both views in the back end.
5682 else
5693 -- Case of no full view present. If entity is derived or subtype,
5694 -- it is safe to freeze, correctness depends on the frozen status
5695 -- of parent. Otherwise it is either premature usage, or a Taft
5696 -- amendment type, so diagnosis is at the point of use and the
5697 -- type might be frozen later.
5702 else
5708 -- For access subprogram, freeze types of all formals, the return
5709 -- type was already frozen, since it is the Etype of the function.
5710 -- Formal types can be tagged Taft amendment types, but otherwise
5711 -- they cannot be incomplete.
5718 then
5722 -- AI05-151: Incomplete types are allowed in access to
5723 -- subprogram specifications.
5726 Error_Msg_NE
5737 -- For access to a protected subprogram, freeze the equivalent type
5738 -- (however this is not set if we are not generating code or if this
5739 -- is an anonymous type used just for resolution).
5747 -- Generic types are never seen by the back-end, and are also not
5748 -- processed by the expander (since the expander is turned off for
5749 -- generic processing), so we never need freeze nodes for them.
5756 -- Some special processing for non-generic types to complete
5757 -- representation details not known till the freeze point.
5762 -- Some error checks required for ordinary fixed-point type. Defer
5763 -- these till the freeze-point since we need the small and range
5764 -- values. We only do these checks for base types
5769 Error_Msg_N
5774 Error_Msg_N
5780 Error_Msg_N
5786 Error_Msg_N
5798 and then Warn_On_Suspicious_Modulus_Value
5799 then
5803 -- The pool applies to named and anonymous access types, but not
5804 -- to subprogram and to internal types generated for 'Access
5805 -- references.
5810 then
5811 -- If a pragma Default_Storage_Pool applies, and this type has no
5812 -- Storage_Pool or Storage_Size clause (which must have occurred
5813 -- before the freezing point), then use the default. This applies
5814 -- only to base types.
5816 -- None of this applies to access to subprograms, for which there
5817 -- are clearly no pools.
5823 then
5824 -- Case of pragma Default_Storage_Pool (null)
5829 -- Case of pragma Default_Storage_Pool (storage_pool_NAME)
5831 else
5836 -- Check restriction for standard storage pool
5842 -- Deal with error message for pure access type. This is not an
5843 -- error in Ada 2005 if there is no pool (see AI-366).
5849 then
5853 Error_Msg_N
5857 Error_Msg_N
5860 else
5861 Error_Msg_N
5868 -- Case of composite types
5872 -- AI-117 requires that all new primitives of a tagged type must
5873 -- inherit the convention of the full view of the type. Inherited
5874 -- and overriding operations are defined to inherit the convention
5875 -- of their parent or overridden subprogram (also specified in
5876 -- AI-117), which will have occurred earlier (in Derive_Subprogram
5877 -- and New_Overloaded_Entity). Here we set the convention of
5878 -- primitives that are still convention Ada, which will ensure
5879 -- that any new primitives inherit the type's convention. Class-
5880 -- wide types can have a foreign convention inherited from their
5881 -- specific type, but are excluded from this since they don't have
5882 -- any associated primitives.
5887 then
5888 declare
5892 begin
5904 -- If the type is a simple storage pool type, then this is where
5905 -- we attempt to locate and validate its Allocate, Deallocate, and
5906 -- Storage_Size operations (the first is required, and the latter
5907 -- two are optional). We also verify that the full type for a
5908 -- private type is allowed to be a simple storage pool type.
5912 then
5913 -- If the type is marked Has_Private_Declaration, then this is
5914 -- a full type for a private type that was specified with the
5915 -- pragma Simple_Storage_Pool_Type, and here we ensure that the
5916 -- pragma is allowed for the full type (for example, it can't
5917 -- be an array type, or a nonlimited record type).
5922 then
5924 Error_Msg_N
5935 procedure Validate_Simple_Pool_Op_Formal
5942 -- Validate one formal Pool_Op_Formal of the candidate pool
5943 -- operation Pool_Op. The formal must be of Expected_Type
5944 -- and have mode Expected_Mode. OK_Formal will be set to
5945 -- False if the formal doesn't match. If OK_Formal is False
5946 -- on entry, then the formal will effectively be ignored
5947 -- (because validation of the pool op has already failed).
5948 -- Upon return, Pool_Op_Formal will be updated to the next
5949 -- formal, if any.
5951 procedure Validate_Simple_Pool_Operation
5953 -- Search for and validate a simple pool operation with the
5954 -- name Op_Name. If the name is Allocate, then there must be
5955 -- exactly one such primitive operation for the simple pool
5956 -- type. If the name is Deallocate or Storage_Size, then
5957 -- there can be at most one such primitive operation. The
5958 -- profile of the located primitive must conform to what
5959 -- is expected for each operation.
5961 ------------------------------------
5962 -- Validate_Simple_Pool_Op_Formal --
5963 ------------------------------------
5965 procedure Validate_Simple_Pool_Op_Formal
5972 is
5973 begin
5974 -- If OK_Formal is False on entry, then simply ignore
5975 -- the formal, because an earlier formal has already
5976 -- been flagged.
5981 -- If no formal is passed in, then issue an error for a
5982 -- missing formal.
5985 Error_Msg_NE
5995 -- If the pool type was expected for this formal, then
5996 -- this will not be considered a candidate operation
5997 -- for the simple pool, so we unset OK_Formal so that
5998 -- the op and any later formals will be ignored.
6005 else
6006 Error_Msg_NE
6013 -- Issue error if formal's mode is not the expected one
6016 Error_Msg_N
6018 Pool_Op_Formal);
6021 -- Advance to the next formal
6026 ------------------------------------
6027 -- Validate_Simple_Pool_Operation --
6028 ------------------------------------
6030 procedure Validate_Simple_Pool_Operation
6032 is
6038 begin
6039 pragma Assert
6041 Name_Deallocate,
6042 Name_Storage_Size));
6046 -- For each homonym declared immediately in the scope
6047 -- of the simple storage pool type, determine whether
6048 -- the homonym is an operation of the pool type, and,
6049 -- if so, check that its profile is as expected for
6050 -- a simple pool operation of that name.
6056 then
6061 -- The first parameter must be of the pool type
6062 -- in order for the operation to qualify.
6065 Validate_Simple_Pool_Op_Formal
6068 else
6069 Validate_Simple_Pool_Op_Formal
6074 -- If another operation with this name has already
6075 -- been located for the type, then flag an error,
6076 -- since we only allow the type to have a single
6077 -- such primitive.
6080 Error_Msg_NE
6085 -- In the case of Allocate and Deallocate, a formal
6086 -- of type System.Address is required.
6089 Validate_Simple_Pool_Op_Formal
6094 Validate_Simple_Pool_Op_Formal
6099 -- In the case of Allocate and Deallocate, formals
6100 -- of type Storage_Count are required as the third
6101 -- and fourth parameters.
6104 Validate_Simple_Pool_Op_Formal
6107 Validate_Simple_Pool_Op_Formal
6112 -- If no mismatched formals have been found (Is_OK)
6113 -- and no excess formals are present, then this
6114 -- operation has been validated, so record it.
6124 -- There must be a valid Allocate operation for the type,
6125 -- so issue an error if none was found.
6129 then
6135 -- Simple pool operations can't be abstract
6138 Error_Msg_N
6143 -- The Storage_Size operation must be a function with
6144 -- Storage_Count as its result type.
6148 Error_Msg_N
6152 Error_Msg_NE
6157 -- Allocate and Deallocate must be procedures
6160 Error_Msg_N
6166 -- Start of processing for Validate_Simple_Pool_Ops
6168 begin
6176 -- Now that all types from which E may depend are frozen, see if the
6177 -- size is known at compile time, if it must be unsigned, or if
6178 -- strict alignment is required
6187 -- Do not allow a size clause for a type which does not have a size
6188 -- that is known at compile time
6192 then
6193 -- Suppress this message if errors posted on E, even if we are
6194 -- in all errors mode, since this is often a junk message
6197 Error_Msg_N
6203 -- Now we set/verify the representation information, in particular
6204 -- the size and alignment values. This processing is not required for
6205 -- generic types, since generic types do not play any part in code
6206 -- generation, and so the size and alignment values for such types
6207 -- are irrelevant. Ditto for types declared within a generic unit,
6208 -- which may have components that depend on generic parameters, and
6209 -- that will be recreated in an instance.
6214 -- Otherwise we call the layout procedure
6216 else
6220 -- If this is an access to subprogram whose designated type is itself
6221 -- a subprogram type, the return type of this anonymous subprogram
6222 -- type must be decorated as well.
6226 then
6230 -- If the type has a Defaut_Value/Default_Component_Value aspect,
6231 -- this is where we analye the expression (after the type is frozen,
6232 -- since in the case of Default_Value, we are analyzing with the
6233 -- type itself, and we treat Default_Component_Value similarly for
6234 -- the sake of uniformity).
6237 declare
6242 begin
6247 else
6258 Flag_Non_Static_Expr
6265 -- End of freeze processing for type entities
6268 -- Here is where we logically freeze the current entity. If it has a
6269 -- freeze node, then this is the point at which the freeze node is
6270 -- linked into the result list.
6274 -- If a freeze node is already allocated, use it, otherwise allocate
6275 -- a new one. The preallocation happens in the case of anonymous base
6276 -- types, where we preallocate so that we can set First_Subtype_Link.
6277 -- Note that we reset the Sloc to the current freeze location.
6283 else
6294 -- A final pass over record types with discriminants. If the type
6295 -- has an incomplete declaration, there may be constrained access
6296 -- subtypes declared elsewhere, which do not depend on the discrimi-
6297 -- nants of the type, and which are used as component types (i.e.
6298 -- the full view is a recursive type). The designated types of these
6299 -- subtypes can only be elaborated after the type itself, and they
6300 -- need an itype reference.
6304 then
6305 declare
6310 begin
6320 then
6332 -- When a type is frozen, the first subtype of the type is frozen as
6333 -- well (RM 13.14(15)). This has to be done after freezing the type,
6334 -- since obviously the first subtype depends on its own base type.
6339 -- If we just froze a tagged non-class wide record, then freeze the
6340 -- corresponding class-wide type. This must be done after the tagged
6341 -- type itself is frozen, because the class-wide type refers to the
6342 -- tagged type which generates the class.
6347 then
6354 -- Special handling for subprograms
6358 -- If subprogram has address clause then reset Is_Public flag, since
6359 -- we do not want the backend to generate external references.
6363 then
6372 -----------------------------
6373 -- Freeze_Enumeration_Type --
6374 -----------------------------
6377 begin
6378 -- By default, if no size clause is present, an enumeration type with
6379 -- Convention C is assumed to interface to a C enum, and has integer
6380 -- size. This applies to types. For subtypes, verify that its base
6381 -- type has no size clause either. Treat other foreign conventions
6382 -- in the same way, and also make sure alignment is set right.
6389 -- Don't do this if Short_Enums on target
6391 and then not Target_Short_Enums
6392 then
6396 -- Normal Ada case or size clause present or not Long_C_Enums on target
6398 else
6399 -- If the enumeration type interfaces to C, and it has a size clause
6400 -- that specifies less than int size, it warrants a warning. The
6401 -- user may intend the C type to be an enum or a char, so this is
6402 -- not by itself an error that the Ada compiler can detect, but it
6403 -- it is a worth a heads-up. For Boolean and Character types we
6404 -- assume that the programmer has the proper C type in mind.
6412 -- Don't do this if Short_Enums on target
6414 and then not Target_Short_Enums
6415 then
6416 Error_Msg_N
6424 -----------------------
6425 -- Freeze_Expression --
6426 -----------------------
6437 -- This flag is set true if the entity must be frozen outside the
6438 -- current subprogram. This happens in the case of expander generated
6439 -- subprograms (_Init_Proc, _Input, _Output, _Read, _Write) which do
6440 -- not freeze all entities like other bodies, but which nevertheless
6441 -- may reference entities that have to be frozen before the body and
6442 -- obviously cannot be frozen inside the body.
6445 -- If the expression is an array aggregate, the type of the component
6446 -- expressions is also frozen. If the component type is an access type
6447 -- and the expressions include allocators, the designed type is frozen
6448 -- as well.
6451 -- Given an N_Handled_Sequence_Of_Statements node N, determines whether
6452 -- it is the handled statement sequence of an expander-generated
6453 -- subprogram (init proc, stream subprogram, or renaming as body).
6454 -- If so, this is not a freezing context.
6456 -----------------------------------------
6457 -- Find_Aggregate_Component_Desig_Type --
6458 -----------------------------------------
6464 begin
6490 ----------------------
6491 -- In_Expanded_Body --
6492 ----------------------
6498 begin
6501 else
6508 else
6511 -- The following are expander-created bodies, or bodies that
6512 -- are not freeze points.
6521 N_Subprogram_Renaming_Declaration,
6522 N_Expression_Function))
6523 then
6525 else
6531 -- Start of processing for Freeze_Expression
6533 begin
6534 -- Immediate return if freezing is inhibited. This flag is set by the
6535 -- analyzer to stop freezing on generated expressions that would cause
6536 -- freezing if they were in the source program, but which are not
6537 -- supposed to freeze, since they are created.
6543 -- If expression is non-static, then it does not freeze in a default
6544 -- expression, see section "Handling of Default Expressions" in the
6545 -- spec of package Sem for further details. Note that we have to make
6546 -- sure that we actually have a real expression (if we have a subtype
6547 -- indication, we can't test Is_OK_Static_Expression). However, we
6548 -- exclude the case of the prefix of an attribute of a static scalar
6549 -- subtype from this early return, because static subtype attributes
6550 -- should always cause freezing, even in default expressions, but
6551 -- the attribute may not have been marked as static yet (because in
6552 -- Resolve_Attribute, the call to Eval_Attribute follows the call of
6553 -- Freeze_Expression on the prefix).
6555 if In_Spec_Exp
6562 then
6566 -- Freeze type of expression if not frozen already
6574 -- Base type may be an derived numeric type that is frozen at
6575 -- the point of declaration, but first_subtype is still unfrozen.
6582 -- For entity name, freeze entity if not frozen already. A special
6583 -- exception occurs for an identifier that did not come from source.
6584 -- We don't let such identifiers freeze a non-internal entity, i.e.
6585 -- an entity that did come from source, since such an identifier was
6586 -- generated by the expander, and cannot have any semantic effect on
6587 -- the freezing semantics. For example, this stops the parameter of
6588 -- an initialization procedure from freezing the variable.
6595 then
6602 else
6606 -- For an allocator freeze designated type if not frozen already
6608 -- For an aggregate whose component type is an access type, freeze the
6609 -- designated type now, so that its freeze does not appear within the
6610 -- loop that might be created in the expansion of the aggregate. If the
6611 -- designated type is a private type without full view, the expression
6612 -- cannot contain an allocator, so the type is not frozen.
6614 -- For a function, we freeze the entity when the subprogram declaration
6615 -- is frozen, but a function call may appear in an initialization proc.
6616 -- before the declaration is frozen. We need to generate the extra
6617 -- formals, if any, to ensure that the expansion of the call includes
6618 -- the proper actuals. This only applies to Ada subprograms, not to
6619 -- imported ones.
6630 then
6632 -- Check whether aggregate includes allocators.
6637 when N_Selected_Component |
6638 N_Indexed_Component |
6639 N_Slice =>
6650 then
6661 then
6665 -- All done if nothing needs freezing
6670 then
6674 -- Examine the enclosing context by climbing the parent chain. The
6675 -- traversal serves two purposes - to detect scenarios where freezeing
6676 -- is not needed and to find the proper insertion point for the freeze
6677 -- nodes. Although somewhat similar to Insert_Actions, this traversal
6678 -- is freezing semantics-sensitive. Inserting freeze nodes blindly in
6679 -- the tree may result in types being frozen too early.
6682 loop
6685 -- If we don't have a parent, then we are not in a well-formed tree.
6686 -- This is an unusual case, but there are some legitimate situations
6687 -- in which this occurs, notably when the expressions in the range of
6688 -- a type declaration are resolved. We simply ignore the freeze
6689 -- request in this case. Is this right ???
6695 -- See if we have got to an appropriate point in the tree
6699 -- A special test for the exception of (RM 13.14(8)) for the case
6700 -- of per-object expressions (RM 3.8(18)) occurring in component
6701 -- definition or a discrete subtype definition. Note that we test
6702 -- for a component declaration which includes both cases we are
6703 -- interested in, and furthermore the tree does not have explicit
6704 -- nodes for either of these two constructs.
6708 -- The case we want to test for here is an identifier that is
6709 -- a per-object expression, this is either a discriminant that
6710 -- appears in a context other than the component declaration
6711 -- or it is a reference to the type of the enclosing construct.
6713 -- For either of these cases, we skip the freezing
6715 if not In_Spec_Expression
6718 then
6719 -- We recognize the discriminant case by just looking for
6720 -- a reference to a discriminant. It can only be one for
6721 -- the enclosing construct. Skip freezing in this case.
6726 -- For the case of a reference to the enclosing record,
6727 -- (or task or protected type), we look for a type that
6728 -- matches the current scope.
6735 -- If we have an enumeration literal that appears as the choice in
6736 -- the aggregate of an enumeration representation clause, then
6737 -- freezing does not occur (RM 13.14(10)).
6741 -- The case we are looking for is an enumeration literal
6745 then
6746 -- If enumeration literal appears directly as the choice,
6747 -- do not freeze (this is the normal non-overloaded case)
6751 then
6754 -- If enumeration literal appears as the name of function
6755 -- which is the choice, then also do not freeze. This
6756 -- happens in the overloaded literal case, where the
6757 -- enumeration literal is temporarily changed to a function
6758 -- call for overloading analysis purposes.
6761 and then
6763 and then
6765 then
6770 -- Normally if the parent is a handled sequence of statements,
6771 -- then the current node must be a statement, and that is an
6772 -- appropriate place to insert a freeze node.
6776 -- An exception occurs when the sequence of statements is for
6777 -- an expander generated body that did not do the usual freeze
6778 -- all operation. In this case we usually want to freeze
6779 -- outside this body, not inside it, and we skip past the
6780 -- subprogram body that we are inside.
6783 declare
6787 begin
6788 -- Freeze the entity only when it is declared inside the
6789 -- body of the expander generated procedure. This case
6790 -- is recognized by the scope of the entity or its type,
6791 -- which is either the spec for some enclosing body, or
6792 -- (in the case of init_procs, for which there are no
6793 -- separate specs) the current scope.
6799 or else
6801 then
6807 then
6812 -- An expression function may act as a completion of
6813 -- a function declaration. As such, it can reference
6814 -- entities declared between the two views:
6816 -- Hidden []; -- 1
6817 -- function F return ...;
6818 -- private
6819 -- function Hidden return ...;
6820 -- function F return ... is (Hidden); -- 2
6822 -- Refering to the example above, freezing the expression
6823 -- of F (2) would place Hidden's freeze node (1) in the
6824 -- wrong place. Avoid explicit freezing and let the usual
6825 -- scenarios do the job - for example, reaching the end
6826 -- of the private declarations, or a call to F.
6829 N_Expression_Function
6830 then
6833 -- Freeze outside the body
6835 else
6841 -- Here if normal case where we are in handled statement
6842 -- sequence and want to do the insertion right there.
6844 else
6848 -- If parent is a body or a spec or a block, then the current node
6849 -- is a statement or declaration and we can insert the freeze node
6850 -- before it.
6852 when N_Block_Statement |
6853 N_Entry_Body |
6854 N_Package_Body |
6855 N_Package_Specification |
6856 N_Protected_Body |
6857 N_Subprogram_Body |
6860 -- The expander is allowed to define types in any statements list,
6861 -- so any of the following parent nodes also mark a freezing point
6862 -- if the actual node is in a list of statements or declarations.
6864 when N_Abortable_Part |
6865 N_Accept_Alternative |
6866 N_And_Then |
6867 N_Case_Statement_Alternative |
6868 N_Compilation_Unit_Aux |
6869 N_Conditional_Entry_Call |
6870 N_Delay_Alternative |
6871 N_Elsif_Part |
6872 N_Entry_Call_Alternative |
6873 N_Exception_Handler |
6874 N_Extended_Return_Statement |
6875 N_Freeze_Entity |
6876 N_If_Statement |
6877 N_Or_Else |
6878 N_Selective_Accept |
6879 N_Triggering_Alternative =>
6883 -- Freeze nodes produced by an expression coming from the Actions
6884 -- list of a N_Expression_With_Actions node must remain within the
6885 -- Actions list. Inserting the freeze nodes further up the tree
6886 -- may lead to use before declaration issues in the case of array
6887 -- types.
6892 then
6896 -- Note: N_Loop_Statement is a special case. A type that appears
6897 -- in the source can never be frozen in a loop (this occurs only
6898 -- because of a loop expanded by the expander), so we keep on
6899 -- going. Otherwise we terminate the search. Same is true of any
6900 -- entity which comes from source. (if they have predefined type,
6901 -- that type does not appear to come from source, but the entity
6902 -- should not be frozen here).
6908 -- For all other cases, keep looking at parents
6914 -- We fall through the case if we did not yet find the proper
6915 -- place in the free for inserting the freeze node, so climb.
6920 -- If the expression appears in a record or an initialization procedure,
6921 -- the freeze nodes are collected and attached to the current scope, to
6922 -- be inserted and analyzed on exit from the scope, to insure that
6923 -- generated entities appear in the correct scope. If the expression is
6924 -- a default for a discriminant specification, the scope is still void.
6925 -- The expression can also appear in the discriminant part of a private
6926 -- or concurrent type.
6928 -- If the expression appears in a constrained subcomponent of an
6929 -- enclosing record declaration, the freeze nodes must be attached to
6930 -- the outer record type so they can eventually be placed in the
6931 -- enclosing declaration list.
6933 -- The other case requiring this special handling is if we are in a
6934 -- default expression, since in that case we are about to freeze a
6935 -- static type, and the freeze scope needs to be the outer scope, not
6936 -- the scope of the subprogram with the default parameter.
6938 -- For default expressions and other spec expressions in generic units,
6939 -- the Move_Freeze_Nodes mechanism (see sem_ch12.adb) takes care of
6940 -- placing them at the proper place, after the generic unit.
6943 or else Freeze_Outside
6948 then
6949 declare
6954 begin
6967 -- The current scope may be that of a constrained component of
6968 -- an enclosing record declaration, or of a loop of an enclosing
6969 -- quantified expression, which is above the current scope in the
6970 -- scope stack. Indeed in the context of a quantified expression,
6971 -- a scope is created and pushed above the current scope in order
6972 -- to emulate the loop-like behavior of the quantified expression.
6973 -- If the expression is within a top-level pragma, as for a pre-
6974 -- condition on a library-level subprogram, nothing to do.
6979 N_Quantified_Expression)
6980 then
6987 Freeze_Nodes;
6988 else
6998 -- Now we have the right place to do the freezing. First, a special
6999 -- adjustment, if we are in spec-expression analysis mode, these freeze
7000 -- actions must not be thrown away (normally all inserted actions are
7001 -- thrown away in this mode. However, the freeze actions are from static
7002 -- expressions and one of the important reasons we are doing this
7003 -- special analysis is to get these freeze actions. Therefore we turn
7004 -- off the In_Spec_Expression mode to propagate these freeze actions.
7005 -- This also means they get properly analyzed and expanded.
7009 -- Freeze the designated type of an allocator (RM 13.14(13))
7015 -- Freeze type of expression (RM 13.14(10)). Note that we took care of
7016 -- the enumeration representation clause exception in the loop above.
7022 -- Freeze name if one is present (RM 13.14(11))
7028 -- Restore In_Spec_Expression flag
7033 -----------------------------
7034 -- Freeze_Fixed_Point_Type --
7035 -----------------------------
7037 -- Certain fixed-point types and subtypes, including implicit base types
7038 -- and declared first subtypes, have not yet set up a range. This is
7039 -- because the range cannot be set until the Small and Size values are
7040 -- known, and these are not known till the type is frozen.
7042 -- To signal this case, Scalar_Range contains an unanalyzed syntactic range
7043 -- whose bounds are unanalyzed real literals. This routine will recognize
7044 -- this case, and transform this range node into a properly typed range
7045 -- with properly analyzed and resolved values.
7062 -- Save original bounds (for shaving tests)
7065 -- Actual size chosen
7068 -- Returns size of type with given bounds. Also leaves these
7069 -- bounds set as the current bounds of the Typ.
7071 -----------
7072 -- Fsize --
7073 -----------
7076 begin
7082 -- Start of processing for Freeze_Fixed_Point_Type
7084 begin
7085 -- If Esize of a subtype has not previously been set, set it now
7092 else
7097 -- Immediate return if the range is already analyzed. This means that
7098 -- the range is already set, and does not need to be computed by this
7099 -- routine.
7105 -- Immediate return if either of the bounds raises Constraint_Error
7109 then
7119 -- Ordinary fixed-point case
7123 -- For the ordinary fixed-point case, we are allowed to fudge the
7124 -- end-points up or down by small. Generally we prefer to fudge up,
7125 -- i.e. widen the bounds for non-model numbers so that the end points
7126 -- are included. However there are cases in which this cannot be
7127 -- done, and indeed cases in which we may need to narrow the bounds.
7128 -- The following circuit makes the decision.
7130 -- Note: our terminology here is that Incl_EP means that the bounds
7131 -- are widened by Small if necessary to include the end points, and
7132 -- Excl_EP means that the bounds are narrowed by Small to exclude the
7133 -- end-points if this reduces the size.
7135 -- Note that in the Incl case, all we care about is including the
7136 -- end-points. In the Excl case, we want to narrow the bounds as
7137 -- much as permitted by the RM, to give the smallest possible size.
7154 begin
7155 -- First step. Base types are required to be symmetrical. Right
7156 -- now, the base type range is a copy of the first subtype range.
7157 -- This will be corrected before we are done, but right away we
7158 -- need to deal with the case where both bounds are non-negative.
7159 -- In this case, we set the low bound to the negative of the high
7160 -- bound, to make sure that the size is computed to include the
7161 -- required sign. Note that we do not need to worry about the
7162 -- case of both bounds negative, because the sign will be dealt
7163 -- with anyway. Furthermore we can't just go making such a bound
7164 -- symmetrical, since in a twos-complement system, there is an
7165 -- extra negative value which could not be accommodated on the
7166 -- positive side.
7171 then
7176 -- Compute the fudged bounds. If the number is a model number,
7177 -- then we do nothing to include it, but we are allowed to backoff
7178 -- to the next adjacent model number when we exclude it. If it is
7179 -- not a model number then we straddle the two values with the
7180 -- model numbers on either side.
7186 else
7190 -- The low value excluding the end point is Small greater, but
7191 -- we do not do this exclusion if the low value is positive,
7192 -- since it can't help the size and could actually hurt by
7193 -- crossing the high bound.
7198 -- If the value went from negative to zero, then we have the
7199 -- case where Loval_Incl_EP is the model number just below
7200 -- zero, so we want to stick to the negative value for the
7201 -- base type to maintain the condition that the size will
7202 -- include signed values.
7206 then
7210 else
7214 -- Similar processing for upper bound and high value
7220 else
7226 else
7230 -- One further adjustment is needed. In the case of subtypes, we
7231 -- cannot go outside the range of the base type, or we get
7232 -- peculiarities, and the base type range is already set. This
7233 -- only applies to the Incl values, since clearly the Excl values
7234 -- are already as restricted as they are allowed to be.
7241 -- Get size including and excluding end points
7246 -- No need to exclude end-points if it does not reduce size
7256 -- Now we set the actual size to be used. We want to use the
7257 -- bounds fudged up to include the end-points but only if this
7258 -- can be done without violating a specifically given size
7259 -- size clause or causing an unacceptable increase in size.
7261 -- Case of size clause given
7265 -- Use the inclusive size only if it is consistent with
7266 -- the explicitly specified size.
7273 -- If the inclusive size is too large, we try excluding
7274 -- the end-points (will be caught later if does not work).
7276 else
7282 -- Case of size clause not given
7284 else
7285 -- If we have a base type whose corresponding first subtype
7286 -- has an explicit size that is large enough to include our
7287 -- end-points, then do so. There is no point in working hard
7288 -- to get a base type whose size is smaller than the specified
7289 -- size of the first subtype.
7295 then
7300 -- If excluding the end-points makes the size smaller and
7301 -- results in a size of 8,16,32,64, then we take the smaller
7302 -- size. For the 64 case, this is compulsory. For the other
7303 -- cases, it seems reasonable. We like to include end points
7304 -- if we can, but not at the expense of moving to the next
7305 -- natural boundary of size.
7309 then
7314 -- Otherwise we can definitely include the end points
7316 else
7322 -- One pathological case: normally we never fudge a low bound
7323 -- down, since it would seem to increase the size (if it has
7324 -- any effect), but for ranges containing single value, or no
7325 -- values, the high bound can be small too large. Consider:
7327 -- type t is delta 2.0**(-14)
7328 -- range 131072.0 .. 0;
7330 -- That lower bound is *just* outside the range of 32 bits, and
7331 -- does need fudging down in this case. Note that the bounds
7332 -- will always have crossed here, since the high bound will be
7333 -- fudged down if necessary, as in the case of:
7335 -- type t is delta 2.0**(-14)
7336 -- range 131072.0 .. 131072.0;
7338 -- So we detect the situation by looking for crossed bounds,
7339 -- and if the bounds are crossed, and the low bound is greater
7340 -- than zero, we will always back it off by small, since this
7341 -- is completely harmless.
7348 -- And of course, we need to do exactly the same parallel
7349 -- fudge for flat ranges in the negative region.
7362 -- For the decimal case, none of this fudging is required, since there
7363 -- are no end-point problems in the decimal case (the end-points are
7364 -- always included).
7366 else
7370 -- At this stage, the actual size has been calculated and the proper
7371 -- required bounds are stored in the low and high bounds.
7375 Error_Msg_N
7377 Typ);
7381 -- Check size against explicit given size
7387 Error_Msg_NE
7391 else
7395 -- Increase size to next natural boundary if no size clause given
7397 else
7404 else
7412 -- If we have a base type, then expand the bounds so that they extend to
7413 -- the full width of the allocated size in bits, to avoid junk range
7414 -- checks on intermediate computations.
7421 -- Final step is to reanalyze the bounds using the proper type
7422 -- and set the Corresponding_Integer_Value fields of the literals.
7428 -- Resolve with universal fixed if the base type, and the base type if
7429 -- it is a subtype. Note we can't resolve the base type with itself,
7430 -- that would be a reference before definition.
7434 else
7438 -- Set corresponding integer value for bound
7440 Set_Corresponding_Integer_Value
7443 -- Similar processing for high bound
7451 else
7455 Set_Corresponding_Integer_Value
7458 -- Set type of range to correspond to bounds
7462 -- Set Esize to calculated size if not set already
7468 -- Set RM_Size if not already set. If already set, check value
7470 declare
7473 begin
7478 Error_Msg_NE
7483 else
7488 -- Check for shaving
7492 Error_Msg_N
7494 Error_Msg_N
7499 Error_Msg_N
7501 Error_Msg_N
7507 ------------------
7508 -- Freeze_Itype --
7509 ------------------
7514 begin
7523 --------------------------
7524 -- Freeze_Static_Object --
7525 --------------------------
7530 -- Exception raised if the type of a static object cannot be made
7531 -- static. This happens if the type depends on non-global objects.
7534 -- Called to ensure that an expression used as part of a type definition
7535 -- is statically allocatable, which means that the expression type is
7536 -- statically allocatable, and the expression is either static, or a
7537 -- reference to a library level constant.
7540 -- Called to mark a type as static, checking that it is possible
7541 -- to set the type as static. If it is not possible, then the
7542 -- exception Cannot_Be_Static is raised.
7544 -----------------------------
7545 -- Ensure_Expression_Is_SA --
7546 -----------------------------
7551 begin
7563 then
7571 -----------------------
7572 -- Ensure_Type_Is_SA --
7573 -----------------------
7579 begin
7580 -- If type is library level, we are all set
7586 -- We are also OK if the type already marked as statically allocated,
7587 -- which means we processed it before.
7593 -- Mark type as statically allocated
7597 -- Check that it is safe to statically allocate this type
7615 declare
7619 begin
7631 else
7640 then
7659 else
7664 -- Start of processing for Freeze_Static_Object
7666 begin
7669 exception
7672 -- If the object that cannot be static is imported or exported, then
7673 -- issue an error message saying that this object cannot be imported
7674 -- or exported. If it has an address clause it is an overlay in the
7675 -- current partition and the static requirement is not relevant.
7676 -- Do not issue any error message when ignoring rep clauses.
7683 Error_Msg_N
7687 -- Otherwise must be exported, something is wrong if compiler
7688 -- is marking something as statically allocated which cannot be).
7691 Error_Msg_N
7696 -----------------------
7697 -- Freeze_Subprogram --
7698 -----------------------
7704 begin
7705 -- Subprogram may not have an address clause unless it is imported
7709 Error_Msg_N
7716 -- Reset the Pure indication on an imported subprogram unless an
7717 -- explicit Pure_Function pragma was present or the subprogram is an
7718 -- intrinsic. We do this because otherwise it is an insidious error
7719 -- to call a non-pure function from pure unit and have calls
7720 -- mysteriously optimized away. What happens here is that the Import
7721 -- can bypass the normal check to ensure that pure units call only pure
7722 -- subprograms.
7724 -- The reason for the intrinsic exception is that in general, intrinsic
7725 -- functions (such as shifts) are pure anyway. The only exceptions are
7726 -- the intrinsics in GNAT.Source_Info, and that unit is not marked Pure
7727 -- in any case, so no problem arises.
7733 then
7737 -- We also reset the Pure indication on a subprogram with an Address
7738 -- parameter, because the parameter may be used as a pointer and the
7739 -- referenced data may change even if the address value does not.
7741 -- Note that if the programmer gave an explicit Pure_Function pragma,
7742 -- then we believe the programmer, and leave the subprogram Pure.
7743 -- We also suppress this check on run-time files.
7749 then
7753 -- For non-foreign convention subprograms, this is where we create
7754 -- the extra formals (for accessibility level and constrained bit
7755 -- information). We delay this till the freeze point precisely so
7756 -- that we know the convention.
7762 -- If this is convention Ada and a Valued_Procedure, that's odd
7767 and then Warn_On_Export_Import
7768 then
7769 Error_Msg_N
7774 -- Case of foreign convention
7776 else
7779 -- For foreign conventions, warn about return of unconstrained array
7784 -- If no return type, probably some other error, e.g. a
7785 -- missing full declaration, so ignore.
7790 -- If the return type is generic, we have emitted a warning
7791 -- earlier on, and there is nothing else to check here. Specific
7792 -- instantiations may lead to erroneous behavior.
7797 -- Display warning if returning unconstrained array
7802 -- Check appropriate warning is enabled (should we check for
7803 -- Warnings (Off) on specific entities here, probably so???)
7805 and then Warn_On_Export_Import
7806 then
7807 Error_Msg_N
7814 -- If any of the formals for an exported foreign convention
7815 -- subprogram have defaults, then emit an appropriate warning since
7816 -- this is odd (default cannot be used from non-Ada code)
7821 if Warn_On_Export_Import
7823 then
7824 Error_Msg_N
7834 -- Pragma Inline_Always is disallowed for dispatching subprograms
7835 -- because the address of such subprograms is saved in the dispatch
7836 -- table to support dispatching calls, and dispatching calls cannot
7837 -- be inlined. This is consistent with the restriction against using
7838 -- 'Access or 'Address on an Inline_Always subprogram.
7842 then
7843 Error_Msg_N
7847 -- Because of the implicit representation of inherited predefined
7848 -- operators in the front-end, the overriding status of the operation
7849 -- may be affected when a full view of a type is analyzed, and this is
7850 -- not captured by the analysis of the corresponding type declaration.
7851 -- Therefore the correctness of a not-overriding indicator must be
7852 -- rechecked when the subprogram is frozen.
7856 then
7861 ----------------------
7862 -- Is_Fully_Defined --
7863 ----------------------
7866 begin
7875 then
7876 -- Verify that the record type has no components with private types
7877 -- without completion.
7879 declare
7882 begin
7894 -- For the designated type of an access to subprogram, all types in
7895 -- the profile must be fully defined.
7898 declare
7901 begin
7914 else
7920 ---------------------------------
7921 -- Process_Default_Expressions --
7922 ---------------------------------
7924 procedure Process_Default_Expressions
7927 is
7934 begin
7937 -- A subprogram instance and its associated anonymous subprogram share
7938 -- their signature. The default expression functions are defined in the
7939 -- wrapper packages for the anonymous subprogram, and should not be
7940 -- generated again for the instance.
7945 then
7953 -- We work with a copy of the default expression because we
7954 -- do not want to disturb the original, since this would mess
7955 -- up the conformance checking.
7959 -- The analysis of the expression may generate insert actions,
7960 -- which of course must not be executed. We wrap those actions
7961 -- in a procedure that is not called, and later on eliminated.
7962 -- The following cases have no side-effects, and are analyzed
7963 -- directly.
7967 N_Integer_Literal,
7968 N_Character_Literal,
7969 N_String_Literal,
7970 N_Real_Literal)
7974 then
7975 -- If there is no default function, we must still do a full
7976 -- analyze call on the default value, to ensure that all error
7977 -- checks are performed, e.g. those associated with static
7978 -- evaluation. Note: this branch will always be taken if the
7979 -- analyzer is turned off (but we still need the error checks).
7981 -- Note: the setting of parent here is to meet the requirement
7982 -- that we can only analyze the expression while attached to
7983 -- the tree. Really the requirement is that the parent chain
7984 -- be set, we don't actually need to be in the tree.
7989 -- Default expressions are resolved with their own type if the
7990 -- context is generic, to avoid anomalies with private types.
7994 else
7998 -- If that resolved expression will raise constraint error,
7999 -- then flag the default value as raising constraint error.
8000 -- This allows a proper error message on the calls.
8006 -- If the default is a parameterless call, we use the name of
8007 -- the called function directly, and there is no body to build.
8011 then
8014 -- Else construct and analyze the body of a wrapper procedure
8015 -- that contains an object declaration to hold the expression.
8016 -- Given that this is done only to complete the analysis, it
8017 -- simpler to build a procedure than a function which might
8018 -- involve secondary stack expansion.
8020 else
8023 Dbody :=
8025 Specification =>
8032 Object_Definition =>
8036 Handled_Statement_Sequence =>
8053 ----------------------------------------
8054 -- Set_Component_Alignment_If_Not_Set --
8055 ----------------------------------------
8058 begin
8059 -- Ignore if not base type, subtypes don't need anything
8065 -- Do not override existing representation
8076 else
8077 Set_Component_Alignment
8083 --------------------------
8084 -- Set_SSO_From_Default --
8085 --------------------------
8090 begin
8091 -- Set default SSO for an array or record base type, except in case of
8092 -- a type extension (which always inherits the SSO of its parent type).
8099 then
8100 Reversed :=
8102 or else
8107 -- For a record type, if bit order is specified explicitly,
8108 -- then do not set SSO from default if not consistent. Note that
8109 -- we do not want to look at a Bit_Order attribute definition
8110 -- for a parent: if we were to inherit Bit_Order, then both
8111 -- SSO_Set_*_By_Default flags would have been cleared already
8112 -- (by Inherit_Aspects_At_Freeze_Point).
8114 and then not
8116 and then
8119 then
8120 -- If flags cause reverse storage order, then set the result. Note
8121 -- that we would have ignored the pragma setting the non default
8122 -- storage order in any case, hence the assertion at this point.
8124 pragma Assert
8129 -- For a record type, also set reversed bit order. Note: if a bit
8130 -- order has been specified explicitly, then this is a no-op.
8139 ------------------
8140 -- Undelay_Type --
8141 ------------------
8144 begin
8148 -- Since we don't want T to have a Freeze_Node, we don't want its
8149 -- Full_View or Corresponding_Record_Type to have one either.
8151 -- ??? Fundamentally, this whole handling is unpleasant. What we really
8152 -- want is to be sure that for an Itype that's part of record R and is a
8153 -- subtype of type T, that it's frozen after the later of the freeze
8154 -- points of R and T. We have no way of doing that directly, so what we
8155 -- do is force most such Itypes to be frozen as part of freezing R via
8156 -- this procedure and only delay the ones that need to be delayed
8157 -- (mostly the designated types of access types that are defined as part
8158 -- of the record).
8164 then
8172 then
8177 ------------------
8178 -- Warn_Overlay --
8179 ------------------
8183 -- The object to which the address clause applies
8189 begin
8190 -- No warning if address clause overlay warnings are off
8196 -- No warning if there is an explicit initialization
8204 -- We only give the warning for non-imported entities of a type for
8205 -- which a non-null base init proc is defined, or for objects of access
8206 -- types with implicit null initialization, or when Normalize_Scalars
8207 -- applies and the type is scalar or a string type (the latter being
8208 -- tested for because predefined String types are initialized by inline
8209 -- code rather than by an init_proc). Note that we do not give the
8210 -- warning for Initialize_Scalars, since we suppressed initialization
8211 -- in this case. Also, do not warn if Suppress_Initialization is set.
8221 then
8224 then
8229 then
8236 then
8243 -- A function call (most likely to To_Address) is probably not an
8244 -- overlay, so skip warning. Ditto if the function call was inlined
8245 -- and transformed into an entity.
8251 -- If a pragma Import follows, we assume that it is for the current
8252 -- target of the address clause, and skip the warning. There may be
8253 -- a source pragma or an aspect that specifies import and generates
8254 -- the corresponding pragma. These will indicate that the entity is
8255 -- imported and that is checked above so that the spurious warning
8256 -- (generated when the entity is frozen) will be suppressed. The
8257 -- pragma may be attached to the aspect, so it is not yet a list
8258 -- member.
8266 then
8271 -- Otherwise give warning message
8275 Error_Msg_N
8277 Nam);
8278 else
8279 Error_Msg_N
8281 Nam);
8284 -- Add friendly warning if initialization comes from a packed array
8285 -- component.
8288 declare
8291 begin
8296 then
8300 then
8301 Error_Msg_NE
8306 else
8313 Error_Msg_N
8316 Nam);