projects / thirdparty / gcc.git / blame
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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 | -- -- | |
| 91b1417d | 9 | -- Copyright (C) 1992-2004, Free Software Foundation, Inc. -- |
| 70482933 RK |
10 | -- -- |
| 11 | -- GNAT is free software; you can redistribute it and/or modify it under -- | |
| 12 | -- terms of the GNU General Public License as published by the Free Soft- -- | |
| 13 | -- ware Foundation; either version 2, or (at your option) any later ver- -- | |
| 14 | -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- | |
| 15 | -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- | |
| 16 | -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- | |
| 17 | -- for more details. You should have received a copy of the GNU General -- | |
| 18 | -- Public License distributed with GNAT; see file COPYING. If not, write -- | |
| 19 | -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- | |
| 20 | -- MA 02111-1307, USA. -- | |
| 21 | -- -- | |
| 22 | -- GNAT was originally developed by the GNAT team at New York University. -- | |
| 71ff80dc | 23 | -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| 70482933 RK |
24 | -- -- |
| 25 | ------------------------------------------------------------------------------ | |
| 26 | ||
| 27 | with Atree; use Atree; | |
| 28 | with Debug; use Debug; | |
| 29 | with Einfo; use Einfo; | |
| 30 | with Elists; use Elists; | |
| 31 | with Errout; use Errout; | |
| 32 | with Exp_Ch7; use Exp_Ch7; | |
| 33 | with Exp_Ch11; use Exp_Ch11; | |
| 34 | with Exp_Pakd; use Exp_Pakd; | |
| 35 | with Exp_Util; use Exp_Util; | |
| fbf5a39b | 36 | with Exp_Tss; use Exp_Tss; |
| 70482933 | 37 | with Layout; use Layout; |
| 07fc65c4 | 38 | with Lib.Xref; use Lib.Xref; |
| 70482933 RK |
39 | with Nlists; use Nlists; |
| 40 | with Nmake; use Nmake; | |
| 41 | with Opt; use Opt; | |
| 42 | with Restrict; use Restrict; | |
| 6e937c1c | 43 | with Rident; use Rident; |
| 70482933 RK |
44 | with Sem; use Sem; |
| 45 | with Sem_Cat; use Sem_Cat; | |
| 46 | with Sem_Ch6; use Sem_Ch6; | |
| 47 | with Sem_Ch7; use Sem_Ch7; | |
| 48 | with Sem_Ch8; use Sem_Ch8; | |
| 49 | with Sem_Ch13; use Sem_Ch13; | |
| 50 | with Sem_Eval; use Sem_Eval; | |
| 51 | with Sem_Mech; use Sem_Mech; | |
| 52 | with Sem_Prag; use Sem_Prag; | |
| 53 | with Sem_Res; use Sem_Res; | |
| 54 | with Sem_Util; use Sem_Util; | |
| 55 | with Sinfo; use Sinfo; | |
| 56 | with Snames; use Snames; | |
| 57 | with Stand; use Stand; | |
| 58 | with Targparm; use Targparm; | |
| 59 | with Tbuild; use Tbuild; | |
| 60 | with Ttypes; use Ttypes; | |
| 61 | with Uintp; use Uintp; | |
| 62 | with Urealp; use Urealp; | |
| 63 | ||
| 64 | package body Freeze is | |
| 65 | ||
| 66 | ----------------------- | |
| 67 | -- Local Subprograms -- | |
| 68 | ----------------------- | |
| 69 | ||
| 70 | procedure Adjust_Esize_For_Alignment (Typ : Entity_Id); | |
| 71 | -- Typ is a type that is being frozen. If no size clause is given, | |
| 72 | -- but a default Esize has been computed, then this default Esize is | |
| 73 | -- adjusted up if necessary to be consistent with a given alignment, | |
| 74 | -- but never to a value greater than Long_Long_Integer'Size. This | |
| 75 | -- is used for all discrete types and for fixed-point types. | |
| 76 | ||
| 77 | procedure Build_And_Analyze_Renamed_Body | |
| 78 | (Decl : Node_Id; | |
| 79 | New_S : Entity_Id; | |
| 80 | After : in out Node_Id); | |
| 81 | -- Build body for a renaming declaration, insert in tree and analyze. | |
| 82 | ||
| fbf5a39b AC |
83 | procedure Check_Address_Clause (E : Entity_Id); |
| 84 | -- Apply legality checks to address clauses for object declarations, | |
| 85 | -- at the point the object is frozen. | |
| 86 | ||
| 70482933 RK |
87 | procedure Check_Strict_Alignment (E : Entity_Id); |
| 88 | -- E is a base type. If E is tagged or has a component that is aliased | |
| 89 | -- or tagged or contains something this is aliased or tagged, set | |
| 90 | -- Strict_Alignment. | |
| 91 | ||
| 92 | procedure Check_Unsigned_Type (E : Entity_Id); | |
| 93 | pragma Inline (Check_Unsigned_Type); | |
| 94 | -- If E is a fixed-point or discrete type, then all the necessary work | |
| 95 | -- to freeze it is completed except for possible setting of the flag | |
| 96 | -- Is_Unsigned_Type, which is done by this procedure. The call has no | |
| 97 | -- effect if the entity E is not a discrete or fixed-point type. | |
| 98 | ||
| 99 | procedure Freeze_And_Append | |
| 100 | (Ent : Entity_Id; | |
| 101 | Loc : Source_Ptr; | |
| 102 | Result : in out List_Id); | |
| 103 | -- Freezes Ent using Freeze_Entity, and appends the resulting list of | |
| 104 | -- nodes to Result, modifying Result from No_List if necessary. | |
| 105 | ||
| 106 | procedure Freeze_Enumeration_Type (Typ : Entity_Id); | |
| 107 | -- Freeze enumeration type. The Esize field is set as processing | |
| 108 | -- proceeds (i.e. set by default when the type is declared and then | |
| 109 | -- adjusted by rep clauses. What this procedure does is to make sure | |
| 110 | -- that if a foreign convention is specified, and no specific size | |
| 111 | -- is given, then the size must be at least Integer'Size. | |
| 112 | ||
| 70482933 RK |
113 | procedure Freeze_Static_Object (E : Entity_Id); |
| 114 | -- If an object is frozen which has Is_Statically_Allocated set, then | |
| 115 | -- all referenced types must also be marked with this flag. This routine | |
| 116 | -- is in charge of meeting this requirement for the object entity E. | |
| 117 | ||
| 118 | procedure Freeze_Subprogram (E : Entity_Id); | |
| 119 | -- Perform freezing actions for a subprogram (create extra formals, | |
| 120 | -- and set proper default mechanism values). Note that this routine | |
| 121 | -- is not called for internal subprograms, for which neither of these | |
| 122 | -- actions is needed (or desirable, we do not want for example to have | |
| 123 | -- these extra formals present in initialization procedures, where they | |
| 124 | -- would serve no purpose). In this call E is either a subprogram or | |
| 125 | -- a subprogram type (i.e. an access to a subprogram). | |
| 126 | ||
| 127 | function Is_Fully_Defined (T : Entity_Id) return Boolean; | |
| bde58e32 | 128 | -- True if T is not private and has no private components, or has a full |
| 657a9dd9 AC |
129 | -- view. Used to determine whether the designated type of an access type |
| 130 | -- should be frozen when the access type is frozen. This is done when an | |
| 131 | -- allocator is frozen, or an expression that may involve attributes of | |
| 132 | -- the designated type. Otherwise freezing the access type does not freeze | |
| 133 | -- the designated type. | |
| 70482933 RK |
134 | |
| 135 | procedure Process_Default_Expressions | |
| 136 | (E : Entity_Id; | |
| 137 | After : in out Node_Id); | |
| 138 | -- This procedure is called for each subprogram to complete processing | |
| 139 | -- of default expressions at the point where all types are known to be | |
| 140 | -- frozen. The expressions must be analyzed in full, to make sure that | |
| 141 | -- all error processing is done (they have only been pre-analyzed). If | |
| 142 | -- the expression is not an entity or literal, its analysis may generate | |
| 143 | -- code which must not be executed. In that case we build a function | |
| 144 | -- body to hold that code. This wrapper function serves no other purpose | |
| 145 | -- (it used to be called to evaluate the default, but now the default is | |
| 146 | -- inlined at each point of call). | |
| 147 | ||
| 148 | procedure Set_Component_Alignment_If_Not_Set (Typ : Entity_Id); | |
| 149 | -- Typ is a record or array type that is being frozen. This routine | |
| 150 | -- sets the default component alignment from the scope stack values | |
| 151 | -- if the alignment is otherwise not specified. | |
| 152 | ||
| 153 | procedure Check_Debug_Info_Needed (T : Entity_Id); | |
| 154 | -- As each entity is frozen, this routine is called to deal with the | |
| 155 | -- setting of Debug_Info_Needed for the entity. This flag is set if | |
| 156 | -- the entity comes from source, or if we are in Debug_Generated_Code | |
| 157 | -- mode or if the -gnatdV debug flag is set. However, it never sets | |
| 158 | -- the flag if Debug_Info_Off is set. | |
| 159 | ||
| 160 | procedure Set_Debug_Info_Needed (T : Entity_Id); | |
| 161 | -- Sets the Debug_Info_Needed flag on entity T if not already set, and | |
| 162 | -- also on any entities that are needed by T (for an object, the type | |
| 163 | -- of the object is needed, and for a type, the subsidiary types are | |
| 164 | -- needed -- see body for details). Never has any effect on T if the | |
| 165 | -- Debug_Info_Off flag is set. | |
| 166 | ||
| fbf5a39b AC |
167 | procedure Warn_Overlay |
| 168 | (Expr : Node_Id; | |
| 169 | Typ : Entity_Id; | |
| 170 | Nam : Node_Id); | |
| 171 | -- Expr is the expression for an address clause for entity Nam whose type | |
| 172 | -- is Typ. If Typ has a default initialization, and there is no explicit | |
| 173 | -- initialization in the source declaration, check whether the address | |
| 174 | -- clause might cause overlaying of an entity, and emit a warning on the | |
| 175 | -- side effect that the initialization will cause. | |
| 176 | ||
| 70482933 RK |
177 | ------------------------------- |
| 178 | -- Adjust_Esize_For_Alignment -- | |
| 179 | ------------------------------- | |
| 180 | ||
| 181 | procedure Adjust_Esize_For_Alignment (Typ : Entity_Id) is | |
| 182 | Align : Uint; | |
| 183 | ||
| 184 | begin | |
| 185 | if Known_Esize (Typ) and then Known_Alignment (Typ) then | |
| 186 | Align := Alignment_In_Bits (Typ); | |
| 187 | ||
| 188 | if Align > Esize (Typ) | |
| 189 | and then Align <= Standard_Long_Long_Integer_Size | |
| 190 | then | |
| 191 | Set_Esize (Typ, Align); | |
| 192 | end if; | |
| 193 | end if; | |
| 194 | end Adjust_Esize_For_Alignment; | |
| 195 | ||
| 196 | ------------------------------------ | |
| 197 | -- Build_And_Analyze_Renamed_Body -- | |
| 198 | ------------------------------------ | |
| 199 | ||
| 200 | procedure Build_And_Analyze_Renamed_Body | |
| 201 | (Decl : Node_Id; | |
| 202 | New_S : Entity_Id; | |
| 203 | After : in out Node_Id) | |
| 204 | is | |
| 205 | Body_Node : constant Node_Id := Build_Renamed_Body (Decl, New_S); | |
| 206 | ||
| 207 | begin | |
| 208 | Insert_After (After, Body_Node); | |
| 209 | Mark_Rewrite_Insertion (Body_Node); | |
| 210 | Analyze (Body_Node); | |
| 211 | After := Body_Node; | |
| 212 | end Build_And_Analyze_Renamed_Body; | |
| 213 | ||
| 214 | ------------------------ | |
| 215 | -- Build_Renamed_Body -- | |
| 216 | ------------------------ | |
| 217 | ||
| 218 | function Build_Renamed_Body | |
| 219 | (Decl : Node_Id; | |
| fbf5a39b | 220 | New_S : Entity_Id) return Node_Id |
| 70482933 RK |
221 | is |
| 222 | Loc : constant Source_Ptr := Sloc (New_S); | |
| 223 | -- We use for the source location of the renamed body, the location | |
| 224 | -- of the spec entity. It might seem more natural to use the location | |
| 225 | -- of the renaming declaration itself, but that would be wrong, since | |
| 226 | -- then the body we create would look as though it was created far | |
| 227 | -- too late, and this could cause problems with elaboration order | |
| 228 | -- analysis, particularly in connection with instantiations. | |
| 229 | ||
| 230 | N : constant Node_Id := Unit_Declaration_Node (New_S); | |
| 231 | Nam : constant Node_Id := Name (N); | |
| 232 | Old_S : Entity_Id; | |
| 233 | Spec : constant Node_Id := New_Copy_Tree (Specification (Decl)); | |
| 234 | Actuals : List_Id := No_List; | |
| 235 | Call_Node : Node_Id; | |
| 236 | Call_Name : Node_Id; | |
| 237 | Body_Node : Node_Id; | |
| 238 | Formal : Entity_Id; | |
| 239 | O_Formal : Entity_Id; | |
| 240 | Param_Spec : Node_Id; | |
| 241 | ||
| 242 | begin | |
| 243 | -- Determine the entity being renamed, which is the target of the | |
| 244 | -- call statement. If the name is an explicit dereference, this is | |
| 245 | -- a renaming of a subprogram type rather than a subprogram. The | |
| 246 | -- name itself is fully analyzed. | |
| 247 | ||
| 248 | if Nkind (Nam) = N_Selected_Component then | |
| 249 | Old_S := Entity (Selector_Name (Nam)); | |
| 250 | ||
| 251 | elsif Nkind (Nam) = N_Explicit_Dereference then | |
| 252 | Old_S := Etype (Nam); | |
| 253 | ||
| 254 | elsif Nkind (Nam) = N_Indexed_Component then | |
| 70482933 RK |
255 | if Is_Entity_Name (Prefix (Nam)) then |
| 256 | Old_S := Entity (Prefix (Nam)); | |
| 257 | else | |
| 258 | Old_S := Entity (Selector_Name (Prefix (Nam))); | |
| 259 | end if; | |
| 260 | ||
| 261 | elsif Nkind (Nam) = N_Character_Literal then | |
| 262 | Old_S := Etype (New_S); | |
| 263 | ||
| 264 | else | |
| 265 | Old_S := Entity (Nam); | |
| 266 | end if; | |
| 267 | ||
| 268 | if Is_Entity_Name (Nam) then | |
| 07fc65c4 GB |
269 | |
| 270 | -- If the renamed entity is a predefined operator, retain full | |
| 271 | -- name to ensure its visibility. | |
| 272 | ||
| 273 | if Ekind (Old_S) = E_Operator | |
| 274 | and then Nkind (Nam) = N_Expanded_Name | |
| 275 | then | |
| 276 | Call_Name := New_Copy (Name (N)); | |
| 277 | else | |
| 278 | Call_Name := New_Reference_To (Old_S, Loc); | |
| 279 | end if; | |
| 280 | ||
| 70482933 RK |
281 | else |
| 282 | Call_Name := New_Copy (Name (N)); | |
| 283 | ||
| 284 | -- The original name may have been overloaded, but | |
| 285 | -- is fully resolved now. | |
| 286 | ||
| 287 | Set_Is_Overloaded (Call_Name, False); | |
| 288 | end if; | |
| 289 | ||
| 290 | -- For simple renamings, subsequent calls can be expanded directly | |
| 291 | -- as called to the renamed entity. The body must be generated in | |
| 292 | -- any case for calls they may appear elsewhere. | |
| 293 | ||
| 294 | if (Ekind (Old_S) = E_Function | |
| 295 | or else Ekind (Old_S) = E_Procedure) | |
| 296 | and then Nkind (Decl) = N_Subprogram_Declaration | |
| 297 | then | |
| 298 | Set_Body_To_Inline (Decl, Old_S); | |
| 299 | end if; | |
| 300 | ||
| 301 | -- The body generated for this renaming is an internal artifact, and | |
| 302 | -- does not constitute a freeze point for the called entity. | |
| 303 | ||
| 304 | Set_Must_Not_Freeze (Call_Name); | |
| 305 | ||
| 306 | Formal := First_Formal (Defining_Entity (Decl)); | |
| 307 | ||
| 308 | if Present (Formal) then | |
| 309 | Actuals := New_List; | |
| 310 | ||
| 311 | while Present (Formal) loop | |
| 312 | Append (New_Reference_To (Formal, Loc), Actuals); | |
| 313 | Next_Formal (Formal); | |
| 314 | end loop; | |
| 315 | end if; | |
| 316 | ||
| 317 | -- If the renamed entity is an entry, inherit its profile. For | |
| 318 | -- other renamings as bodies, both profiles must be subtype | |
| 319 | -- conformant, so it is not necessary to replace the profile given | |
| 320 | -- in the declaration. However, default values that are aggregates | |
| 321 | -- are rewritten when partially analyzed, so we recover the original | |
| 322 | -- aggregate to insure that subsequent conformity checking works. | |
| 07fc65c4 GB |
323 | -- Similarly, if the default expression was constant-folded, recover |
| 324 | -- the original expression. | |
| 70482933 RK |
325 | |
| 326 | Formal := First_Formal (Defining_Entity (Decl)); | |
| 327 | ||
| 328 | if Present (Formal) then | |
| 329 | O_Formal := First_Formal (Old_S); | |
| 330 | Param_Spec := First (Parameter_Specifications (Spec)); | |
| 331 | ||
| 332 | while Present (Formal) loop | |
| 333 | if Is_Entry (Old_S) then | |
| 334 | ||
| 335 | if Nkind (Parameter_Type (Param_Spec)) /= | |
| 336 | N_Access_Definition | |
| 337 | then | |
| 338 | Set_Etype (Formal, Etype (O_Formal)); | |
| 339 | Set_Entity (Parameter_Type (Param_Spec), Etype (O_Formal)); | |
| 340 | end if; | |
| 341 | ||
| 07fc65c4 GB |
342 | elsif Nkind (Default_Value (O_Formal)) = N_Aggregate |
| 343 | or else Nkind (Original_Node (Default_Value (O_Formal))) /= | |
| 344 | Nkind (Default_Value (O_Formal)) | |
| 345 | then | |
| 70482933 RK |
346 | Set_Expression (Param_Spec, |
| 347 | New_Copy_Tree (Original_Node (Default_Value (O_Formal)))); | |
| 348 | end if; | |
| 349 | ||
| 350 | Next_Formal (Formal); | |
| 351 | Next_Formal (O_Formal); | |
| 352 | Next (Param_Spec); | |
| 353 | end loop; | |
| 354 | end if; | |
| 355 | ||
| 356 | -- If the renamed entity is a function, the generated body contains a | |
| 357 | -- return statement. Otherwise, build a procedure call. If the entity is | |
| 358 | -- an entry, subsequent analysis of the call will transform it into the | |
| 359 | -- proper entry or protected operation call. If the renamed entity is | |
| 360 | -- a character literal, return it directly. | |
| 361 | ||
| 362 | if Ekind (Old_S) = E_Function | |
| 363 | or else Ekind (Old_S) = E_Operator | |
| 364 | or else (Ekind (Old_S) = E_Subprogram_Type | |
| 365 | and then Etype (Old_S) /= Standard_Void_Type) | |
| 366 | then | |
| 367 | Call_Node := | |
| 368 | Make_Return_Statement (Loc, | |
| 369 | Expression => | |
| 370 | Make_Function_Call (Loc, | |
| 371 | Name => Call_Name, | |
| 372 | Parameter_Associations => Actuals)); | |
| 373 | ||
| 374 | elsif Ekind (Old_S) = E_Enumeration_Literal then | |
| 375 | Call_Node := | |
| 376 | Make_Return_Statement (Loc, | |
| 377 | Expression => New_Occurrence_Of (Old_S, Loc)); | |
| 378 | ||
| 379 | elsif Nkind (Nam) = N_Character_Literal then | |
| 380 | Call_Node := | |
| 381 | Make_Return_Statement (Loc, | |
| 382 | Expression => Call_Name); | |
| 383 | ||
| 384 | else | |
| 385 | Call_Node := | |
| 386 | Make_Procedure_Call_Statement (Loc, | |
| 387 | Name => Call_Name, | |
| 388 | Parameter_Associations => Actuals); | |
| 389 | end if; | |
| 390 | ||
| 391 | -- Create entities for subprogram body and formals. | |
| 392 | ||
| 393 | Set_Defining_Unit_Name (Spec, | |
| 394 | Make_Defining_Identifier (Loc, Chars => Chars (New_S))); | |
| 395 | ||
| 396 | Param_Spec := First (Parameter_Specifications (Spec)); | |
| 397 | ||
| 398 | while Present (Param_Spec) loop | |
| 399 | Set_Defining_Identifier (Param_Spec, | |
| 400 | Make_Defining_Identifier (Loc, | |
| 401 | Chars => Chars (Defining_Identifier (Param_Spec)))); | |
| 402 | Next (Param_Spec); | |
| 403 | end loop; | |
| 404 | ||
| 405 | Body_Node := | |
| 406 | Make_Subprogram_Body (Loc, | |
| 407 | Specification => Spec, | |
| 408 | Declarations => New_List, | |
| 409 | Handled_Statement_Sequence => | |
| 410 | Make_Handled_Sequence_Of_Statements (Loc, | |
| 411 | Statements => New_List (Call_Node))); | |
| 412 | ||
| 413 | if Nkind (Decl) /= N_Subprogram_Declaration then | |
| 414 | Rewrite (N, | |
| 415 | Make_Subprogram_Declaration (Loc, | |
| 416 | Specification => Specification (N))); | |
| 417 | end if; | |
| 418 | ||
| 419 | -- Link the body to the entity whose declaration it completes. If | |
| 420 | -- the body is analyzed when the renamed entity is frozen, it may be | |
| 421 | -- necessary to restore the proper scope (see package Exp_Ch13). | |
| 422 | ||
| 423 | if Nkind (N) = N_Subprogram_Renaming_Declaration | |
| 424 | and then Present (Corresponding_Spec (N)) | |
| 425 | then | |
| 426 | Set_Corresponding_Spec (Body_Node, Corresponding_Spec (N)); | |
| 427 | else | |
| 428 | Set_Corresponding_Spec (Body_Node, New_S); | |
| 429 | end if; | |
| 430 | ||
| 431 | return Body_Node; | |
| 432 | end Build_Renamed_Body; | |
| 433 | ||
| fbf5a39b AC |
434 | -------------------------- |
| 435 | -- Check_Address_Clause -- | |
| 436 | -------------------------- | |
| 437 | ||
| 438 | procedure Check_Address_Clause (E : Entity_Id) is | |
| 439 | Addr : constant Node_Id := Address_Clause (E); | |
| 440 | Expr : Node_Id; | |
| 441 | Decl : constant Node_Id := Declaration_Node (E); | |
| 442 | Typ : constant Entity_Id := Etype (E); | |
| 443 | ||
| 444 | begin | |
| 445 | if Present (Addr) then | |
| 446 | Expr := Expression (Addr); | |
| 447 | ||
| 448 | -- If we have no initialization of any kind, then we don't | |
| 449 | -- need to place any restrictions on the address clause, because | |
| 450 | -- the object will be elaborated after the address clause is | |
| 451 | -- evaluated. This happens if the declaration has no initial | |
| 452 | -- expression, or the type has no implicit initialization, or | |
| 453 | -- the object is imported. | |
| 454 | ||
| 455 | -- The same holds for all initialized scalar types and all | |
| 456 | -- access types. Packed bit arrays of size up to 64 are | |
| 457 | -- represented using a modular type with an initialization | |
| 458 | -- (to zero) and can be processed like other initialized | |
| 459 | -- scalar types. | |
| 460 | ||
| 461 | -- If the type is controlled, code to attach the object to a | |
| 462 | -- finalization chain is generated at the point of declaration, | |
| 463 | -- and therefore the elaboration of the object cannot be delayed: | |
| 464 | -- the address expression must be a constant. | |
| 465 | ||
| 466 | if (No (Expression (Decl)) | |
| 467 | and then not Controlled_Type (Typ) | |
| 468 | and then | |
| 469 | (not Has_Non_Null_Base_Init_Proc (Typ) | |
| 470 | or else Is_Imported (E))) | |
| 471 | ||
| 472 | or else | |
| 473 | (Present (Expression (Decl)) | |
| 474 | and then Is_Scalar_Type (Typ)) | |
| 475 | ||
| 476 | or else | |
| 477 | Is_Access_Type (Typ) | |
| 478 | ||
| 479 | or else | |
| 480 | (Is_Bit_Packed_Array (Typ) | |
| 481 | and then | |
| 482 | Is_Modular_Integer_Type (Packed_Array_Type (Typ))) | |
| 483 | then | |
| 484 | null; | |
| 485 | ||
| 486 | -- Otherwise, we require the address clause to be constant | |
| 487 | -- because the call to the initialization procedure (or the | |
| 488 | -- attach code) has to happen at the point of the declaration. | |
| 489 | ||
| 490 | else | |
| 491 | Check_Constant_Address_Clause (Expr, E); | |
| 492 | Set_Has_Delayed_Freeze (E, False); | |
| 493 | end if; | |
| 494 | ||
| 495 | if not Error_Posted (Expr) | |
| 496 | and then not Controlled_Type (Typ) | |
| 497 | then | |
| 498 | Warn_Overlay (Expr, Typ, Name (Addr)); | |
| 499 | end if; | |
| 500 | end if; | |
| 501 | end Check_Address_Clause; | |
| 502 | ||
| 70482933 RK |
503 | ----------------------------- |
| 504 | -- Check_Compile_Time_Size -- | |
| 505 | ----------------------------- | |
| 506 | ||
| 507 | procedure Check_Compile_Time_Size (T : Entity_Id) is | |
| 508 | ||
| 509 | procedure Set_Small_Size (S : Uint); | |
| 510 | -- Sets the compile time known size (32 bits or less) in the Esize | |
| 511 | -- field, checking for a size clause that was given which attempts | |
| 512 | -- to give a smaller size. | |
| 513 | ||
| 514 | function Size_Known (T : Entity_Id) return Boolean; | |
| 07fc65c4 | 515 | -- Recursive function that does all the work |
| 70482933 RK |
516 | |
| 517 | function Static_Discriminated_Components (T : Entity_Id) return Boolean; | |
| 518 | -- If T is a constrained subtype, its size is not known if any of its | |
| 519 | -- discriminant constraints is not static and it is not a null record. | |
| fbf5a39b | 520 | -- The test is conservative and doesn't check that the components are |
| 70482933 RK |
521 | -- in fact constrained by non-static discriminant values. Could be made |
| 522 | -- more precise ??? | |
| 523 | ||
| 524 | -------------------- | |
| 525 | -- Set_Small_Size -- | |
| 526 | -------------------- | |
| 527 | ||
| 528 | procedure Set_Small_Size (S : Uint) is | |
| 529 | begin | |
| 530 | if S > 32 then | |
| 531 | return; | |
| 532 | ||
| 533 | elsif Has_Size_Clause (T) then | |
| 534 | if RM_Size (T) < S then | |
| 535 | Error_Msg_Uint_1 := S; | |
| 536 | Error_Msg_NE | |
| 537 | ("size for & is too small, minimum is ^", | |
| 538 | Size_Clause (T), T); | |
| 539 | ||
| 540 | elsif Unknown_Esize (T) then | |
| 541 | Set_Esize (T, S); | |
| 542 | end if; | |
| 543 | ||
| 544 | -- Set sizes if not set already | |
| 545 | ||
| 546 | else | |
| 547 | if Unknown_Esize (T) then | |
| 548 | Set_Esize (T, S); | |
| 549 | end if; | |
| 550 | ||
| 551 | if Unknown_RM_Size (T) then | |
| 552 | Set_RM_Size (T, S); | |
| 553 | end if; | |
| 554 | end if; | |
| 555 | end Set_Small_Size; | |
| 556 | ||
| 557 | ---------------- | |
| 558 | -- Size_Known -- | |
| 559 | ---------------- | |
| 560 | ||
| 561 | function Size_Known (T : Entity_Id) return Boolean is | |
| 562 | Index : Entity_Id; | |
| 563 | Comp : Entity_Id; | |
| 564 | Ctyp : Entity_Id; | |
| 565 | Low : Node_Id; | |
| 566 | High : Node_Id; | |
| 567 | ||
| 568 | begin | |
| 569 | if Size_Known_At_Compile_Time (T) then | |
| 570 | return True; | |
| 571 | ||
| 70482933 RK |
572 | elsif Is_Scalar_Type (T) |
| 573 | or else Is_Task_Type (T) | |
| 574 | then | |
| 575 | return not Is_Generic_Type (T); | |
| 576 | ||
| 577 | elsif Is_Array_Type (T) then | |
| 70482933 RK |
578 | if Ekind (T) = E_String_Literal_Subtype then |
| 579 | Set_Small_Size (Component_Size (T) * String_Literal_Length (T)); | |
| 580 | return True; | |
| 581 | ||
| 582 | elsif not Is_Constrained (T) then | |
| 583 | return False; | |
| 584 | ||
| 07fc65c4 GB |
585 | -- Don't do any recursion on type with error posted, since |
| 586 | -- we may have a malformed type that leads us into a loop | |
| 587 | ||
| 588 | elsif Error_Posted (T) then | |
| 589 | return False; | |
| 590 | ||
| 70482933 RK |
591 | elsif not Size_Known (Component_Type (T)) then |
| 592 | return False; | |
| 593 | end if; | |
| 594 | ||
| 595 | -- Check for all indexes static, and also compute possible | |
| 596 | -- size (in case it is less than 32 and may be packable). | |
| 597 | ||
| 598 | declare | |
| 599 | Esiz : Uint := Component_Size (T); | |
| 600 | Dim : Uint; | |
| 601 | ||
| 602 | begin | |
| 603 | Index := First_Index (T); | |
| 604 | ||
| 605 | while Present (Index) loop | |
| 606 | if Nkind (Index) = N_Range then | |
| 607 | Get_Index_Bounds (Index, Low, High); | |
| 608 | ||
| 609 | elsif Error_Posted (Scalar_Range (Etype (Index))) then | |
| 610 | return False; | |
| 611 | ||
| 612 | else | |
| 613 | Low := Type_Low_Bound (Etype (Index)); | |
| 614 | High := Type_High_Bound (Etype (Index)); | |
| 615 | end if; | |
| 616 | ||
| 617 | if not Compile_Time_Known_Value (Low) | |
| 618 | or else not Compile_Time_Known_Value (High) | |
| 619 | or else Etype (Index) = Any_Type | |
| 620 | then | |
| 621 | return False; | |
| 622 | ||
| 623 | else | |
| 624 | Dim := Expr_Value (High) - Expr_Value (Low) + 1; | |
| 625 | ||
| 626 | if Dim >= 0 then | |
| 627 | Esiz := Esiz * Dim; | |
| 628 | else | |
| 629 | Esiz := Uint_0; | |
| 630 | end if; | |
| 631 | end if; | |
| 632 | ||
| 633 | Next_Index (Index); | |
| 634 | end loop; | |
| 635 | ||
| 636 | Set_Small_Size (Esiz); | |
| 637 | return True; | |
| 638 | end; | |
| 639 | ||
| 640 | elsif Is_Access_Type (T) then | |
| 641 | return True; | |
| 642 | ||
| 643 | elsif Is_Private_Type (T) | |
| 644 | and then not Is_Generic_Type (T) | |
| 645 | and then Present (Underlying_Type (T)) | |
| 646 | then | |
| 07fc65c4 GB |
647 | -- Don't do any recursion on type with error posted, since |
| 648 | -- we may have a malformed type that leads us into a loop | |
| 649 | ||
| 650 | if Error_Posted (T) then | |
| 651 | return False; | |
| 652 | else | |
| 653 | return Size_Known (Underlying_Type (T)); | |
| 654 | end if; | |
| 70482933 RK |
655 | |
| 656 | elsif Is_Record_Type (T) then | |
| fbf5a39b AC |
657 | |
| 658 | -- A class-wide type is never considered to have a known size | |
| 659 | ||
| 70482933 RK |
660 | if Is_Class_Wide_Type (T) then |
| 661 | return False; | |
| 662 | ||
| fbf5a39b AC |
663 | -- A subtype of a variant record must not have non-static |
| 664 | -- discriminanted components. | |
| 665 | ||
| 666 | elsif T /= Base_Type (T) | |
| 667 | and then not Static_Discriminated_Components (T) | |
| 668 | then | |
| 669 | return False; | |
| 70482933 | 670 | |
| 07fc65c4 GB |
671 | -- Don't do any recursion on type with error posted, since |
| 672 | -- we may have a malformed type that leads us into a loop | |
| 673 | ||
| 674 | elsif Error_Posted (T) then | |
| 675 | return False; | |
| fbf5a39b | 676 | end if; |
| 07fc65c4 | 677 | |
| fbf5a39b | 678 | -- Now look at the components of the record |
| 70482933 | 679 | |
| fbf5a39b AC |
680 | declare |
| 681 | -- The following two variables are used to keep track of | |
| 682 | -- the size of packed records if we can tell the size of | |
| 683 | -- the packed record in the front end. Packed_Size_Known | |
| 684 | -- is True if so far we can figure out the size. It is | |
| 685 | -- initialized to True for a packed record, unless the | |
| 686 | -- record has discriminants. The reason we eliminate the | |
| 687 | -- discriminated case is that we don't know the way the | |
| 688 | -- back end lays out discriminated packed records. If | |
| 689 | -- Packed_Size_Known is True, then Packed_Size is the | |
| 690 | -- size in bits so far. | |
| 691 | ||
| 692 | Packed_Size_Known : Boolean := | |
| 693 | Is_Packed (T) | |
| 694 | and then not Has_Discriminants (T); | |
| 695 | ||
| 696 | Packed_Size : Uint := Uint_0; | |
| 697 | ||
| 698 | begin | |
| 699 | -- Test for variant part present | |
| 700 | ||
| 701 | if Has_Discriminants (T) | |
| 702 | and then Present (Parent (T)) | |
| 703 | and then Nkind (Parent (T)) = N_Full_Type_Declaration | |
| 704 | and then Nkind (Type_Definition (Parent (T))) = | |
| 705 | N_Record_Definition | |
| 706 | and then not Null_Present (Type_Definition (Parent (T))) | |
| 707 | and then Present (Variant_Part | |
| 708 | (Component_List (Type_Definition (Parent (T))))) | |
| 709 | then | |
| 710 | -- If variant part is present, and type is unconstrained, | |
| 711 | -- then we must have defaulted discriminants, or a size | |
| 712 | -- clause must be present for the type, or else the size | |
| 713 | -- is definitely not known at compile time. | |
| 714 | ||
| 715 | if not Is_Constrained (T) | |
| 716 | and then | |
| 717 | No (Discriminant_Default_Value | |
| 718 | (First_Discriminant (T))) | |
| 719 | and then Unknown_Esize (T) | |
| 70482933 | 720 | then |
| fbf5a39b AC |
721 | return False; |
| 722 | end if; | |
| 723 | end if; | |
| 70482933 | 724 | |
| fbf5a39b AC |
725 | -- Loop through components |
| 726 | ||
| 727 | Comp := First_Entity (T); | |
| 728 | while Present (Comp) loop | |
| 729 | if Ekind (Comp) = E_Component | |
| 730 | or else | |
| 731 | Ekind (Comp) = E_Discriminant | |
| 732 | then | |
| 733 | Ctyp := Etype (Comp); | |
| 734 | ||
| 735 | -- We do not know the packed size if there is a | |
| 736 | -- component clause present (we possibly could, | |
| 737 | -- but this would only help in the case of a record | |
| 738 | -- with partial rep clauses. That's because in the | |
| 739 | -- case of full rep clauses, the size gets figured | |
| 740 | -- out anyway by a different circuit). | |
| 741 | ||
| 742 | if Present (Component_Clause (Comp)) then | |
| 70482933 RK |
743 | Packed_Size_Known := False; |
| 744 | end if; | |
| 70482933 | 745 | |
| fbf5a39b AC |
746 | -- We need to identify a component that is an array |
| 747 | -- where the index type is an enumeration type with | |
| 748 | -- non-standard representation, and some bound of the | |
| 749 | -- type depends on a discriminant. | |
| 750 | ||
| 751 | -- This is because gigi computes the size by doing a | |
| 752 | -- substituation of the appropriate discriminant value | |
| 753 | -- in the size expression for the base type, and gigi | |
| 754 | -- is not clever enough to evaluate the resulting | |
| 755 | -- expression (which involves a call to rep_to_pos) | |
| 756 | -- at compile time. | |
| 757 | ||
| 758 | -- It would be nice if gigi would either recognize that | |
| 759 | -- this expression can be computed at compile time, or | |
| 760 | -- alternatively figured out the size from the subtype | |
| 761 | -- directly, where all the information is at hand ??? | |
| 762 | ||
| 763 | if Is_Array_Type (Etype (Comp)) | |
| 764 | and then Present (Packed_Array_Type (Etype (Comp))) | |
| 70482933 | 765 | then |
| fbf5a39b AC |
766 | declare |
| 767 | Ocomp : constant Entity_Id := | |
| 768 | Original_Record_Component (Comp); | |
| 769 | OCtyp : constant Entity_Id := Etype (Ocomp); | |
| 770 | Ind : Node_Id; | |
| 771 | Indtyp : Entity_Id; | |
| 772 | Lo, Hi : Node_Id; | |
| 70482933 | 773 | |
| fbf5a39b AC |
774 | begin |
| 775 | Ind := First_Index (OCtyp); | |
| 776 | while Present (Ind) loop | |
| 777 | Indtyp := Etype (Ind); | |
| 778 | ||
| 779 | if Is_Enumeration_Type (Indtyp) | |
| 780 | and then Has_Non_Standard_Rep (Indtyp) | |
| 781 | then | |
| 782 | Lo := Type_Low_Bound (Indtyp); | |
| 783 | Hi := Type_High_Bound (Indtyp); | |
| 784 | ||
| 785 | if Is_Entity_Name (Lo) | |
| 786 | and then | |
| 787 | Ekind (Entity (Lo)) = E_Discriminant | |
| 788 | then | |
| 789 | return False; | |
| 790 | ||
| 791 | elsif Is_Entity_Name (Hi) | |
| 792 | and then | |
| 793 | Ekind (Entity (Hi)) = E_Discriminant | |
| 794 | then | |
| 795 | return False; | |
| 796 | end if; | |
| 797 | end if; | |
| 798 | ||
| 799 | Next_Index (Ind); | |
| 800 | end loop; | |
| 801 | end; | |
| 802 | end if; | |
| 70482933 | 803 | |
| fbf5a39b AC |
804 | -- Clearly size of record is not known if the size of |
| 805 | -- one of the components is not known. | |
| 70482933 | 806 | |
| fbf5a39b AC |
807 | if not Size_Known (Ctyp) then |
| 808 | return False; | |
| 809 | end if; | |
| 810 | ||
| 811 | -- Accumulate packed size if possible | |
| 812 | ||
| 813 | if Packed_Size_Known then | |
| 814 | ||
| 815 | -- We can only deal with elementary types, since for | |
| 816 | -- non-elementary components, alignment enters into | |
| 817 | -- the picture, and we don't know enough to handle | |
| 818 | -- proper alignment in this context. Packed arrays | |
| 819 | -- count as elementary if the representation is a | |
| 820 | -- modular type. | |
| 70482933 | 821 | |
| fbf5a39b AC |
822 | if Is_Elementary_Type (Ctyp) |
| 823 | or else (Is_Array_Type (Ctyp) | |
| 824 | and then | |
| 825 | Present (Packed_Array_Type (Ctyp)) | |
| 826 | and then | |
| 827 | Is_Modular_Integer_Type | |
| 828 | (Packed_Array_Type (Ctyp))) | |
| 829 | then | |
| 70482933 RK |
830 | -- If RM_Size is known and static, then we can |
| 831 | -- keep accumulating the packed size. | |
| 832 | ||
| 833 | if Known_Static_RM_Size (Ctyp) then | |
| 834 | ||
| 835 | -- A little glitch, to be removed sometime ??? | |
| 836 | -- gigi does not understand zero sizes yet. | |
| 837 | ||
| 838 | if RM_Size (Ctyp) = Uint_0 then | |
| 839 | Packed_Size_Known := False; | |
| 70482933 | 840 | |
| fbf5a39b AC |
841 | -- Normal case where we can keep accumulating |
| 842 | -- the packed array size. | |
| 843 | ||
| 844 | else | |
| 845 | Packed_Size := Packed_Size + RM_Size (Ctyp); | |
| 846 | end if; | |
| 70482933 RK |
847 | |
| 848 | -- If we have a field whose RM_Size is not known | |
| 849 | -- then we can't figure out the packed size here. | |
| 850 | ||
| 851 | else | |
| 852 | Packed_Size_Known := False; | |
| 853 | end if; | |
| fbf5a39b AC |
854 | |
| 855 | -- If we have a non-elementary type we can't figure | |
| 856 | -- out the packed array size (alignment issues). | |
| 857 | ||
| 858 | else | |
| 859 | Packed_Size_Known := False; | |
| 70482933 RK |
860 | end if; |
| 861 | end if; | |
| fbf5a39b | 862 | end if; |
| 70482933 | 863 | |
| fbf5a39b AC |
864 | Next_Entity (Comp); |
| 865 | end loop; | |
| 70482933 | 866 | |
| fbf5a39b AC |
867 | if Packed_Size_Known then |
| 868 | Set_Small_Size (Packed_Size); | |
| 869 | end if; | |
| 70482933 | 870 | |
| fbf5a39b AC |
871 | return True; |
| 872 | end; | |
| 70482933 RK |
873 | |
| 874 | else | |
| 875 | return False; | |
| 876 | end if; | |
| 877 | end Size_Known; | |
| 878 | ||
| 879 | ------------------------------------- | |
| 880 | -- Static_Discriminated_Components -- | |
| 881 | ------------------------------------- | |
| 882 | ||
| 883 | function Static_Discriminated_Components | |
| 884 | (T : Entity_Id) | |
| 885 | return Boolean | |
| 886 | is | |
| 887 | Constraint : Elmt_Id; | |
| 888 | ||
| 889 | begin | |
| 890 | if Has_Discriminants (T) | |
| 891 | and then Present (Discriminant_Constraint (T)) | |
| 892 | and then Present (First_Component (T)) | |
| 893 | then | |
| 894 | Constraint := First_Elmt (Discriminant_Constraint (T)); | |
| 70482933 RK |
895 | while Present (Constraint) loop |
| 896 | if not Compile_Time_Known_Value (Node (Constraint)) then | |
| 897 | return False; | |
| 898 | end if; | |
| 899 | ||
| 900 | Next_Elmt (Constraint); | |
| 901 | end loop; | |
| 902 | end if; | |
| 903 | ||
| 904 | return True; | |
| 905 | end Static_Discriminated_Components; | |
| 906 | ||
| 907 | -- Start of processing for Check_Compile_Time_Size | |
| 908 | ||
| 909 | begin | |
| 910 | Set_Size_Known_At_Compile_Time (T, Size_Known (T)); | |
| 911 | end Check_Compile_Time_Size; | |
| 912 | ||
| 913 | ----------------------------- | |
| 914 | -- Check_Debug_Info_Needed -- | |
| 915 | ----------------------------- | |
| 916 | ||
| 917 | procedure Check_Debug_Info_Needed (T : Entity_Id) is | |
| 918 | begin | |
| 919 | if Needs_Debug_Info (T) or else Debug_Info_Off (T) then | |
| 920 | return; | |
| 921 | ||
| 922 | elsif Comes_From_Source (T) | |
| 923 | or else Debug_Generated_Code | |
| 924 | or else Debug_Flag_VV | |
| 925 | then | |
| 926 | Set_Debug_Info_Needed (T); | |
| 927 | end if; | |
| 928 | end Check_Debug_Info_Needed; | |
| 929 | ||
| 930 | ---------------------------- | |
| 931 | -- Check_Strict_Alignment -- | |
| 932 | ---------------------------- | |
| 933 | ||
| 934 | procedure Check_Strict_Alignment (E : Entity_Id) is | |
| 935 | Comp : Entity_Id; | |
| 936 | ||
| 937 | begin | |
| 938 | if Is_Tagged_Type (E) or else Is_Concurrent_Type (E) then | |
| 939 | Set_Strict_Alignment (E); | |
| 940 | ||
| 941 | elsif Is_Array_Type (E) then | |
| 942 | Set_Strict_Alignment (E, Strict_Alignment (Component_Type (E))); | |
| 943 | ||
| 944 | elsif Is_Record_Type (E) then | |
| 945 | if Is_Limited_Record (E) then | |
| 946 | Set_Strict_Alignment (E); | |
| 947 | return; | |
| 948 | end if; | |
| 949 | ||
| 950 | Comp := First_Component (E); | |
| 951 | ||
| 952 | while Present (Comp) loop | |
| 953 | if not Is_Type (Comp) | |
| 954 | and then (Strict_Alignment (Etype (Comp)) | |
| fbf5a39b | 955 | or else Is_Aliased (Comp)) |
| 70482933 RK |
956 | then |
| 957 | Set_Strict_Alignment (E); | |
| 958 | return; | |
| 959 | end if; | |
| 960 | ||
| 961 | Next_Component (Comp); | |
| 962 | end loop; | |
| 963 | end if; | |
| 964 | end Check_Strict_Alignment; | |
| 965 | ||
| 966 | ------------------------- | |
| 967 | -- Check_Unsigned_Type -- | |
| 968 | ------------------------- | |
| 969 | ||
| 970 | procedure Check_Unsigned_Type (E : Entity_Id) is | |
| 971 | Ancestor : Entity_Id; | |
| 972 | Lo_Bound : Node_Id; | |
| 973 | Btyp : Entity_Id; | |
| 974 | ||
| 975 | begin | |
| 976 | if not Is_Discrete_Or_Fixed_Point_Type (E) then | |
| 977 | return; | |
| 978 | end if; | |
| 979 | ||
| 980 | -- Do not attempt to analyze case where range was in error | |
| 981 | ||
| 982 | if Error_Posted (Scalar_Range (E)) then | |
| 983 | return; | |
| 984 | end if; | |
| 985 | ||
| 986 | -- The situation that is non trivial is something like | |
| 987 | ||
| 988 | -- subtype x1 is integer range -10 .. +10; | |
| 989 | -- subtype x2 is x1 range 0 .. V1; | |
| 990 | -- subtype x3 is x2 range V2 .. V3; | |
| 991 | -- subtype x4 is x3 range V4 .. V5; | |
| 992 | ||
| 993 | -- where Vn are variables. Here the base type is signed, but we still | |
| 994 | -- know that x4 is unsigned because of the lower bound of x2. | |
| 995 | ||
| 996 | -- The only way to deal with this is to look up the ancestor chain | |
| 997 | ||
| 998 | Ancestor := E; | |
| 999 | loop | |
| 1000 | if Ancestor = Any_Type or else Etype (Ancestor) = Any_Type then | |
| 1001 | return; | |
| 1002 | end if; | |
| 1003 | ||
| 1004 | Lo_Bound := Type_Low_Bound (Ancestor); | |
| 1005 | ||
| 1006 | if Compile_Time_Known_Value (Lo_Bound) then | |
| 1007 | ||
| 1008 | if Expr_Rep_Value (Lo_Bound) >= 0 then | |
| 1009 | Set_Is_Unsigned_Type (E, True); | |
| 1010 | end if; | |
| 1011 | ||
| 1012 | return; | |
| 1013 | ||
| 1014 | else | |
| 1015 | Ancestor := Ancestor_Subtype (Ancestor); | |
| 1016 | ||
| 1017 | -- If no ancestor had a static lower bound, go to base type | |
| 1018 | ||
| 1019 | if No (Ancestor) then | |
| 1020 | ||
| 1021 | -- Note: the reason we still check for a compile time known | |
| 1022 | -- value for the base type is that at least in the case of | |
| 1023 | -- generic formals, we can have bounds that fail this test, | |
| 1024 | -- and there may be other cases in error situations. | |
| 1025 | ||
| 1026 | Btyp := Base_Type (E); | |
| 1027 | ||
| 1028 | if Btyp = Any_Type or else Etype (Btyp) = Any_Type then | |
| 1029 | return; | |
| 1030 | end if; | |
| 1031 | ||
| 1032 | Lo_Bound := Type_Low_Bound (Base_Type (E)); | |
| 1033 | ||
| 1034 | if Compile_Time_Known_Value (Lo_Bound) | |
| 1035 | and then Expr_Rep_Value (Lo_Bound) >= 0 | |
| 1036 | then | |
| 1037 | Set_Is_Unsigned_Type (E, True); | |
| 1038 | end if; | |
| 1039 | ||
| 1040 | return; | |
| 70482933 RK |
1041 | end if; |
| 1042 | end if; | |
| 1043 | end loop; | |
| 1044 | end Check_Unsigned_Type; | |
| 1045 | ||
| fbf5a39b AC |
1046 | ----------------------------- |
| 1047 | -- Expand_Atomic_Aggregate -- | |
| 1048 | ----------------------------- | |
| 1049 | ||
| 1050 | procedure Expand_Atomic_Aggregate (E : Entity_Id; Typ : Entity_Id) is | |
| 1051 | Loc : constant Source_Ptr := Sloc (E); | |
| 1052 | New_N : Node_Id; | |
| 1053 | Temp : Entity_Id; | |
| 1054 | ||
| 1055 | begin | |
| 1056 | if (Nkind (Parent (E)) = N_Object_Declaration | |
| 1057 | or else Nkind (Parent (E)) = N_Assignment_Statement) | |
| 1058 | and then Comes_From_Source (Parent (E)) | |
| 1059 | and then Nkind (E) = N_Aggregate | |
| 1060 | then | |
| 1061 | Temp := | |
| 1062 | Make_Defining_Identifier (Loc, | |
| 1063 | New_Internal_Name ('T')); | |
| 1064 | ||
| 1065 | New_N := | |
| 1066 | Make_Object_Declaration (Loc, | |
| 1067 | Defining_Identifier => Temp, | |
| 1068 | Object_definition => New_Occurrence_Of (Typ, Loc), | |
| 1069 | Expression => Relocate_Node (E)); | |
| 1070 | Insert_Before (Parent (E), New_N); | |
| 1071 | Analyze (New_N); | |
| 1072 | ||
| 1073 | Set_Expression (Parent (E), New_Occurrence_Of (Temp, Loc)); | |
| 1074 | ||
| 1075 | -- To prevent the temporary from being constant-folded (which | |
| 1076 | -- would lead to the same piecemeal assignment on the original | |
| 1077 | -- target) indicate to the back-end that the temporary is a | |
| 1078 | -- variable with real storage. See description of this flag | |
| 1079 | -- in Einfo, and the notes on N_Assignment_Statement and | |
| 1080 | -- N_Object_Declaration in Sinfo. | |
| 1081 | ||
| 1082 | Set_Is_True_Constant (Temp, False); | |
| 1083 | end if; | |
| 1084 | end Expand_Atomic_Aggregate; | |
| 1085 | ||
| 70482933 RK |
1086 | ---------------- |
| 1087 | -- Freeze_All -- | |
| 1088 | ---------------- | |
| 1089 | ||
| 1090 | -- Note: the easy coding for this procedure would be to just build a | |
| 1091 | -- single list of freeze nodes and then insert them and analyze them | |
| 1092 | -- all at once. This won't work, because the analysis of earlier freeze | |
| 1093 | -- nodes may recursively freeze types which would otherwise appear later | |
| 1094 | -- on in the freeze list. So we must analyze and expand the freeze nodes | |
| 1095 | -- as they are generated. | |
| 1096 | ||
| 1097 | procedure Freeze_All (From : Entity_Id; After : in out Node_Id) is | |
| 1098 | Loc : constant Source_Ptr := Sloc (After); | |
| 1099 | E : Entity_Id; | |
| 1100 | Decl : Node_Id; | |
| 1101 | ||
| 1102 | procedure Freeze_All_Ent (From : Entity_Id; After : in out Node_Id); | |
| 1103 | -- This is the internal recursive routine that does freezing of | |
| 1104 | -- entities (but NOT the analysis of default expressions, which | |
| 1105 | -- should not be recursive, we don't want to analyze those till | |
| 1106 | -- we are sure that ALL the types are frozen). | |
| 1107 | ||
| fbf5a39b AC |
1108 | -------------------- |
| 1109 | -- Freeze_All_Ent -- | |
| 1110 | -------------------- | |
| 1111 | ||
| 70482933 RK |
1112 | procedure Freeze_All_Ent |
| 1113 | (From : Entity_Id; | |
| 1114 | After : in out Node_Id) | |
| 1115 | is | |
| 1116 | E : Entity_Id; | |
| 1117 | Flist : List_Id; | |
| 1118 | Lastn : Node_Id; | |
| 1119 | ||
| 1120 | procedure Process_Flist; | |
| 1121 | -- If freeze nodes are present, insert and analyze, and reset | |
| 1122 | -- cursor for next insertion. | |
| 1123 | ||
| fbf5a39b AC |
1124 | ------------------- |
| 1125 | -- Process_Flist -- | |
| 1126 | ------------------- | |
| 1127 | ||
| 70482933 RK |
1128 | procedure Process_Flist is |
| 1129 | begin | |
| 1130 | if Is_Non_Empty_List (Flist) then | |
| 1131 | Lastn := Next (After); | |
| 1132 | Insert_List_After_And_Analyze (After, Flist); | |
| 1133 | ||
| 1134 | if Present (Lastn) then | |
| 1135 | After := Prev (Lastn); | |
| 1136 | else | |
| 1137 | After := Last (List_Containing (After)); | |
| 1138 | end if; | |
| 1139 | end if; | |
| 1140 | end Process_Flist; | |
| 1141 | ||
| fbf5a39b AC |
1142 | -- Start or processing for Freeze_All_Ent |
| 1143 | ||
| 70482933 RK |
1144 | begin |
| 1145 | E := From; | |
| 1146 | while Present (E) loop | |
| 1147 | ||
| 1148 | -- If the entity is an inner package which is not a package | |
| 1149 | -- renaming, then its entities must be frozen at this point. | |
| 1150 | -- Note that such entities do NOT get frozen at the end of | |
| 1151 | -- the nested package itself (only library packages freeze). | |
| 1152 | ||
| 1153 | -- Same is true for task declarations, where anonymous records | |
| 1154 | -- created for entry parameters must be frozen. | |
| 1155 | ||
| 1156 | if Ekind (E) = E_Package | |
| 1157 | and then No (Renamed_Object (E)) | |
| 1158 | and then not Is_Child_Unit (E) | |
| 1159 | and then not Is_Frozen (E) | |
| 1160 | then | |
| 1161 | New_Scope (E); | |
| 1162 | Install_Visible_Declarations (E); | |
| 1163 | Install_Private_Declarations (E); | |
| 1164 | ||
| 1165 | Freeze_All (First_Entity (E), After); | |
| 1166 | ||
| 1167 | End_Package_Scope (E); | |
| 1168 | ||
| 1169 | elsif Ekind (E) in Task_Kind | |
| 1170 | and then | |
| 1171 | (Nkind (Parent (E)) = N_Task_Type_Declaration | |
| fbf5a39b | 1172 | or else |
| 70482933 RK |
1173 | Nkind (Parent (E)) = N_Single_Task_Declaration) |
| 1174 | then | |
| 1175 | New_Scope (E); | |
| 1176 | Freeze_All (First_Entity (E), After); | |
| 1177 | End_Scope; | |
| 1178 | ||
| 1179 | -- For a derived tagged type, we must ensure that all the | |
| 1180 | -- primitive operations of the parent have been frozen, so | |
| 1181 | -- that their addresses will be in the parent's dispatch table | |
| 1182 | -- at the point it is inherited. | |
| 1183 | ||
| 1184 | elsif Ekind (E) = E_Record_Type | |
| 1185 | and then Is_Tagged_Type (E) | |
| 1186 | and then Is_Tagged_Type (Etype (E)) | |
| 1187 | and then Is_Derived_Type (E) | |
| 1188 | then | |
| 1189 | declare | |
| 1190 | Prim_List : constant Elist_Id := | |
| 1191 | Primitive_Operations (Etype (E)); | |
| fbf5a39b AC |
1192 | |
| 1193 | Prim : Elmt_Id; | |
| 1194 | Subp : Entity_Id; | |
| 70482933 RK |
1195 | |
| 1196 | begin | |
| 1197 | Prim := First_Elmt (Prim_List); | |
| 1198 | ||
| 1199 | while Present (Prim) loop | |
| 1200 | Subp := Node (Prim); | |
| 1201 | ||
| 1202 | if Comes_From_Source (Subp) | |
| 1203 | and then not Is_Frozen (Subp) | |
| 1204 | then | |
| 1205 | Flist := Freeze_Entity (Subp, Loc); | |
| 1206 | Process_Flist; | |
| 1207 | end if; | |
| 1208 | ||
| 1209 | Next_Elmt (Prim); | |
| 1210 | end loop; | |
| 1211 | end; | |
| 1212 | end if; | |
| 1213 | ||
| 1214 | if not Is_Frozen (E) then | |
| 1215 | Flist := Freeze_Entity (E, Loc); | |
| 1216 | Process_Flist; | |
| 1217 | end if; | |
| 1218 | ||
| fbf5a39b AC |
1219 | -- If an incomplete type is still not frozen, this may be |
| 1220 | -- a premature freezing because of a body declaration that | |
| 1221 | -- follows. Indicate where the freezing took place. | |
| 1222 | ||
| 1223 | -- If the freezing is caused by the end of the current | |
| 1224 | -- declarative part, it is a Taft Amendment type, and there | |
| 1225 | -- is no error. | |
| 1226 | ||
| 1227 | if not Is_Frozen (E) | |
| 1228 | and then Ekind (E) = E_Incomplete_Type | |
| 1229 | then | |
| 1230 | declare | |
| 1231 | Bod : constant Node_Id := Next (After); | |
| 1232 | ||
| 1233 | begin | |
| 1234 | if (Nkind (Bod) = N_Subprogram_Body | |
| 1235 | or else Nkind (Bod) = N_Entry_Body | |
| 1236 | or else Nkind (Bod) = N_Package_Body | |
| 1237 | or else Nkind (Bod) = N_Protected_Body | |
| 1238 | or else Nkind (Bod) = N_Task_Body | |
| 1239 | or else Nkind (Bod) in N_Body_Stub) | |
| 1240 | and then | |
| 1241 | List_Containing (After) = List_Containing (Parent (E)) | |
| 1242 | then | |
| 1243 | Error_Msg_Sloc := Sloc (Next (After)); | |
| 1244 | Error_Msg_NE | |
| 1245 | ("type& is frozen# before its full declaration", | |
| 1246 | Parent (E), E); | |
| 1247 | end if; | |
| 1248 | end; | |
| 1249 | end if; | |
| 1250 | ||
| 70482933 RK |
1251 | Next_Entity (E); |
| 1252 | end loop; | |
| 1253 | end Freeze_All_Ent; | |
| 1254 | ||
| 1255 | -- Start of processing for Freeze_All | |
| 1256 | ||
| 1257 | begin | |
| 1258 | Freeze_All_Ent (From, After); | |
| 1259 | ||
| 1260 | -- Now that all types are frozen, we can deal with default expressions | |
| 1261 | -- that require us to build a default expression functions. This is the | |
| 1262 | -- point at which such functions are constructed (after all types that | |
| 1263 | -- might be used in such expressions have been frozen). | |
| fbf5a39b | 1264 | |
| 70482933 RK |
1265 | -- We also add finalization chains to access types whose designated |
| 1266 | -- types are controlled. This is normally done when freezing the type, | |
| 1267 | -- but this misses recursive type definitions where the later members | |
| 1268 | -- of the recursion introduce controlled components (e.g. 5624-001). | |
| 1269 | ||
| 1270 | -- Loop through entities | |
| 1271 | ||
| 1272 | E := From; | |
| 1273 | while Present (E) loop | |
| 70482933 RK |
1274 | if Is_Subprogram (E) then |
| 1275 | ||
| 1276 | if not Default_Expressions_Processed (E) then | |
| 1277 | Process_Default_Expressions (E, After); | |
| 1278 | end if; | |
| 1279 | ||
| 1280 | if not Has_Completion (E) then | |
| 1281 | Decl := Unit_Declaration_Node (E); | |
| 1282 | ||
| 1283 | if Nkind (Decl) = N_Subprogram_Renaming_Declaration then | |
| 1284 | Build_And_Analyze_Renamed_Body (Decl, E, After); | |
| 1285 | ||
| 1286 | elsif Nkind (Decl) = N_Subprogram_Declaration | |
| 1287 | and then Present (Corresponding_Body (Decl)) | |
| 1288 | and then | |
| 1289 | Nkind (Unit_Declaration_Node (Corresponding_Body (Decl))) | |
| fbf5a39b | 1290 | = N_Subprogram_Renaming_Declaration |
| 70482933 RK |
1291 | then |
| 1292 | Build_And_Analyze_Renamed_Body | |
| 1293 | (Decl, Corresponding_Body (Decl), After); | |
| 1294 | end if; | |
| 1295 | end if; | |
| 1296 | ||
| 1297 | elsif Ekind (E) in Task_Kind | |
| 1298 | and then | |
| 1299 | (Nkind (Parent (E)) = N_Task_Type_Declaration | |
| fbf5a39b | 1300 | or else |
| 70482933 RK |
1301 | Nkind (Parent (E)) = N_Single_Task_Declaration) |
| 1302 | then | |
| 1303 | declare | |
| 1304 | Ent : Entity_Id; | |
| 70482933 RK |
1305 | begin |
| 1306 | Ent := First_Entity (E); | |
| 1307 | ||
| 1308 | while Present (Ent) loop | |
| 1309 | ||
| 1310 | if Is_Entry (Ent) | |
| 1311 | and then not Default_Expressions_Processed (Ent) | |
| 1312 | then | |
| 1313 | Process_Default_Expressions (Ent, After); | |
| 1314 | end if; | |
| 1315 | ||
| 1316 | Next_Entity (Ent); | |
| 1317 | end loop; | |
| 1318 | end; | |
| 1319 | ||
| 1320 | elsif Is_Access_Type (E) | |
| 1321 | and then Comes_From_Source (E) | |
| 1322 | and then Ekind (Directly_Designated_Type (E)) = E_Incomplete_Type | |
| 1323 | and then Controlled_Type (Designated_Type (E)) | |
| 1324 | and then No (Associated_Final_Chain (E)) | |
| 1325 | then | |
| 1326 | Build_Final_List (Parent (E), E); | |
| 1327 | end if; | |
| 1328 | ||
| 1329 | Next_Entity (E); | |
| 1330 | end loop; | |
| 70482933 RK |
1331 | end Freeze_All; |
| 1332 | ||
| 1333 | ----------------------- | |
| 1334 | -- Freeze_And_Append -- | |
| 1335 | ----------------------- | |
| 1336 | ||
| 1337 | procedure Freeze_And_Append | |
| 1338 | (Ent : Entity_Id; | |
| 1339 | Loc : Source_Ptr; | |
| 1340 | Result : in out List_Id) | |
| 1341 | is | |
| 1342 | L : constant List_Id := Freeze_Entity (Ent, Loc); | |
| 1343 | ||
| 1344 | begin | |
| 1345 | if Is_Non_Empty_List (L) then | |
| 1346 | if Result = No_List then | |
| 1347 | Result := L; | |
| 1348 | else | |
| 1349 | Append_List (L, Result); | |
| 1350 | end if; | |
| 1351 | end if; | |
| 1352 | end Freeze_And_Append; | |
| 1353 | ||
| 1354 | ------------------- | |
| 1355 | -- Freeze_Before -- | |
| 1356 | ------------------- | |
| 1357 | ||
| 1358 | procedure Freeze_Before (N : Node_Id; T : Entity_Id) is | |
| 1359 | Freeze_Nodes : constant List_Id := Freeze_Entity (T, Sloc (N)); | |
| 70482933 RK |
1360 | |
| 1361 | begin | |
| 1362 | if Is_Non_Empty_List (Freeze_Nodes) then | |
| fbf5a39b | 1363 | Insert_Actions (N, Freeze_Nodes); |
| 70482933 RK |
1364 | end if; |
| 1365 | end Freeze_Before; | |
| 1366 | ||
| 1367 | ------------------- | |
| 1368 | -- Freeze_Entity -- | |
| 1369 | ------------------- | |
| 1370 | ||
| 1371 | function Freeze_Entity (E : Entity_Id; Loc : Source_Ptr) return List_Id is | |
| 1372 | Comp : Entity_Id; | |
| 1373 | F_Node : Node_Id; | |
| 1374 | Result : List_Id; | |
| 1375 | Indx : Node_Id; | |
| 1376 | Formal : Entity_Id; | |
| 1377 | Atype : Entity_Id; | |
| 1378 | ||
| 1379 | procedure Check_Current_Instance (Comp_Decl : Node_Id); | |
| 1380 | -- Check that an Access or Unchecked_Access attribute with | |
| 1381 | -- a prefix which is the current instance type can only be | |
| 1382 | -- applied when the type is limited. | |
| 1383 | ||
| 1384 | function After_Last_Declaration return Boolean; | |
| 1385 | -- If Loc is a freeze_entity that appears after the last declaration | |
| 1386 | -- in the scope, inhibit error messages on late completion. | |
| 1387 | ||
| 1388 | procedure Freeze_Record_Type (Rec : Entity_Id); | |
| 1389 | -- Freeze each component, handle some representation clauses, and | |
| 1390 | -- freeze primitive operations if this is a tagged type. | |
| 1391 | ||
| 1392 | ---------------------------- | |
| 1393 | -- After_Last_Declaration -- | |
| 1394 | ---------------------------- | |
| 1395 | ||
| 1396 | function After_Last_Declaration return Boolean is | |
| fbf5a39b | 1397 | Spec : constant Node_Id := Parent (Current_Scope); |
| 70482933 RK |
1398 | |
| 1399 | begin | |
| 1400 | if Nkind (Spec) = N_Package_Specification then | |
| 1401 | if Present (Private_Declarations (Spec)) then | |
| 1402 | return Loc >= Sloc (Last (Private_Declarations (Spec))); | |
| 1403 | ||
| 1404 | elsif Present (Visible_Declarations (Spec)) then | |
| 1405 | return Loc >= Sloc (Last (Visible_Declarations (Spec))); | |
| 1406 | else | |
| 1407 | return False; | |
| 1408 | end if; | |
| 1409 | ||
| 1410 | else | |
| 1411 | return False; | |
| 1412 | end if; | |
| 1413 | end After_Last_Declaration; | |
| 1414 | ||
| 1415 | ---------------------------- | |
| 1416 | -- Check_Current_Instance -- | |
| 1417 | ---------------------------- | |
| 1418 | ||
| 1419 | procedure Check_Current_Instance (Comp_Decl : Node_Id) is | |
| 1420 | ||
| 1421 | function Process (N : Node_Id) return Traverse_Result; | |
| 1422 | -- Process routine to apply check to given node. | |
| 1423 | ||
| fbf5a39b AC |
1424 | ------------- |
| 1425 | -- Process -- | |
| 1426 | ------------- | |
| 1427 | ||
| 70482933 RK |
1428 | function Process (N : Node_Id) return Traverse_Result is |
| 1429 | begin | |
| 1430 | case Nkind (N) is | |
| 1431 | when N_Attribute_Reference => | |
| 1432 | if (Attribute_Name (N) = Name_Access | |
| 1433 | or else | |
| 1434 | Attribute_Name (N) = Name_Unchecked_Access) | |
| 1435 | and then Is_Entity_Name (Prefix (N)) | |
| 1436 | and then Is_Type (Entity (Prefix (N))) | |
| 1437 | and then Entity (Prefix (N)) = E | |
| 1438 | then | |
| 1439 | Error_Msg_N | |
| 1440 | ("current instance must be a limited type", Prefix (N)); | |
| 1441 | return Abandon; | |
| 1442 | else | |
| 1443 | return OK; | |
| 1444 | end if; | |
| 1445 | ||
| 1446 | when others => return OK; | |
| 1447 | end case; | |
| 1448 | end Process; | |
| 1449 | ||
| 1450 | procedure Traverse is new Traverse_Proc (Process); | |
| 1451 | ||
| 1452 | -- Start of processing for Check_Current_Instance | |
| 1453 | ||
| 1454 | begin | |
| 1455 | Traverse (Comp_Decl); | |
| 1456 | end Check_Current_Instance; | |
| 1457 | ||
| 1458 | ------------------------ | |
| 1459 | -- Freeze_Record_Type -- | |
| 1460 | ------------------------ | |
| 1461 | ||
| 1462 | procedure Freeze_Record_Type (Rec : Entity_Id) is | |
| 1463 | Comp : Entity_Id; | |
| fbf5a39b | 1464 | IR : Node_Id; |
| 70482933 RK |
1465 | Junk : Boolean; |
| 1466 | ADC : Node_Id; | |
| 1467 | ||
| 1468 | Unplaced_Component : Boolean := False; | |
| 1469 | -- Set True if we find at least one component with no component | |
| 1470 | -- clause (used to warn about useless Pack pragmas). | |
| 1471 | ||
| 1472 | Placed_Component : Boolean := False; | |
| 1473 | -- Set True if we find at least one component with a component | |
| 1474 | -- clause (used to warn about useless Bit_Order pragmas). | |
| 1475 | ||
| 1476 | begin | |
| fbf5a39b AC |
1477 | -- If this is a subtype of a controlled type, declared without |
| 1478 | -- a constraint, the _controller may not appear in the component | |
| 1479 | -- list if the parent was not frozen at the point of subtype | |
| 1480 | -- declaration. Inherit the _controller component now. | |
| 1481 | ||
| 1482 | if Rec /= Base_Type (Rec) | |
| 1483 | and then Has_Controlled_Component (Rec) | |
| 1484 | then | |
| 1485 | if Nkind (Parent (Rec)) = N_Subtype_Declaration | |
| 1486 | and then Is_Entity_Name (Subtype_Indication (Parent (Rec))) | |
| 1487 | then | |
| 1488 | Set_First_Entity (Rec, First_Entity (Base_Type (Rec))); | |
| 1489 | ||
| 1490 | -- If this is an internal type without a declaration, as for | |
| 1491 | -- a record component, the base type may not yet be frozen, | |
| 1492 | -- and its controller has not been created. Add an explicit | |
| 1493 | -- freeze node for the itype, so it will be frozen after the | |
| 1494 | -- base type. | |
| 1495 | ||
| 1496 | elsif Is_Itype (Rec) | |
| 1497 | and then Has_Delayed_Freeze (Base_Type (Rec)) | |
| 1498 | and then | |
| 1499 | Nkind (Associated_Node_For_Itype (Rec)) = | |
| 1500 | N_Component_Declaration | |
| 1501 | then | |
| 1502 | Ensure_Freeze_Node (Rec); | |
| 1503 | end if; | |
| 1504 | end if; | |
| 1505 | ||
| 70482933 RK |
1506 | -- Freeze components and embedded subtypes |
| 1507 | ||
| 1508 | Comp := First_Entity (Rec); | |
| 70482933 | 1509 | while Present (Comp) loop |
| 70482933 RK |
1510 | if not Is_Type (Comp) then |
| 1511 | Freeze_And_Append (Etype (Comp), Loc, Result); | |
| 1512 | end if; | |
| 1513 | ||
| 1514 | -- If the component is an access type with an allocator | |
| 1515 | -- as default value, the designated type will be frozen | |
| 1516 | -- by the corresponding expression in init_proc. In order | |
| 1517 | -- to place the freeze node for the designated type before | |
| 1518 | -- that for the current record type, freeze it now. | |
| 1519 | ||
| 1520 | -- Same process if the component is an array of access types, | |
| 1521 | -- initialized with an aggregate. If the designated type is | |
| 1522 | -- private, it cannot contain allocators, and it is premature | |
| 1523 | -- to freeze the type, so we check for this as well. | |
| 1524 | ||
| 1525 | if Is_Access_Type (Etype (Comp)) | |
| 1526 | and then Present (Parent (Comp)) | |
| 1527 | and then Present (Expression (Parent (Comp))) | |
| 1528 | and then Nkind (Expression (Parent (Comp))) = N_Allocator | |
| 1529 | then | |
| 1530 | declare | |
| 1531 | Alloc : constant Node_Id := Expression (Parent (Comp)); | |
| 1532 | ||
| 1533 | begin | |
| 1534 | -- If component is pointer to a classwide type, freeze | |
| 1535 | -- the specific type in the expression being allocated. | |
| 1536 | -- The expression may be a subtype indication, in which | |
| 1537 | -- case freeze the subtype mark. | |
| 1538 | ||
| 1539 | if Is_Class_Wide_Type (Designated_Type (Etype (Comp))) then | |
| 70482933 RK |
1540 | if Is_Entity_Name (Expression (Alloc)) then |
| 1541 | Freeze_And_Append | |
| 1542 | (Entity (Expression (Alloc)), Loc, Result); | |
| 1543 | elsif | |
| 1544 | Nkind (Expression (Alloc)) = N_Subtype_Indication | |
| 1545 | then | |
| 1546 | Freeze_And_Append | |
| 1547 | (Entity (Subtype_Mark (Expression (Alloc))), | |
| 1548 | Loc, Result); | |
| 1549 | end if; | |
| fbf5a39b | 1550 | |
| 70482933 RK |
1551 | else |
| 1552 | Freeze_And_Append | |
| 1553 | (Designated_Type (Etype (Comp)), Loc, Result); | |
| 1554 | end if; | |
| 1555 | end; | |
| 1556 | ||
| 07fc65c4 GB |
1557 | -- If this is a constrained subtype of an already frozen type, |
| 1558 | -- make the subtype frozen as well. It might otherwise be frozen | |
| 1559 | -- in the wrong scope, and a freeze node on subtype has no effect. | |
| 1560 | ||
| 1561 | elsif Is_Access_Type (Etype (Comp)) | |
| 1562 | and then not Is_Frozen (Designated_Type (Etype (Comp))) | |
| 1563 | and then Is_Itype (Designated_Type (Etype (Comp))) | |
| 1564 | and then Is_Frozen (Base_Type (Designated_Type (Etype (Comp)))) | |
| 1565 | then | |
| 1566 | Set_Is_Frozen (Designated_Type (Etype (Comp))); | |
| 1567 | ||
| fbf5a39b AC |
1568 | -- In addition, add an Itype_Reference to ensure that the |
| 1569 | -- access subtype is elaborated early enough. This cannot | |
| 1570 | -- be done if the subtype may depend on discriminants. | |
| 1571 | ||
| 1572 | if Ekind (Comp) = E_Component | |
| 1573 | and then Is_Itype (Etype (Comp)) | |
| 1574 | and then not Has_Discriminants (Rec) | |
| 1575 | then | |
| 1576 | IR := Make_Itype_Reference (Sloc (Comp)); | |
| 1577 | Set_Itype (IR, Designated_Type (Etype (Comp))); | |
| 1578 | ||
| 1579 | if No (Result) then | |
| 1580 | Result := New_List (IR); | |
| 1581 | else | |
| 1582 | Append (IR, Result); | |
| 1583 | end if; | |
| 1584 | end if; | |
| 1585 | ||
| 70482933 RK |
1586 | elsif Is_Array_Type (Etype (Comp)) |
| 1587 | and then Is_Access_Type (Component_Type (Etype (Comp))) | |
| 1588 | and then Present (Parent (Comp)) | |
| 1589 | and then Nkind (Parent (Comp)) = N_Component_Declaration | |
| 1590 | and then Present (Expression (Parent (Comp))) | |
| 1591 | and then Nkind (Expression (Parent (Comp))) = N_Aggregate | |
| 1592 | and then Is_Fully_Defined | |
| 1593 | (Designated_Type (Component_Type (Etype (Comp)))) | |
| 1594 | then | |
| 1595 | Freeze_And_Append | |
| 1596 | (Designated_Type | |
| 1597 | (Component_Type (Etype (Comp))), Loc, Result); | |
| 1598 | end if; | |
| 1599 | ||
| 1600 | -- Processing for real components (exclude anonymous subtypes) | |
| 1601 | ||
| 1602 | if Ekind (Comp) = E_Component | |
| 1603 | or else Ekind (Comp) = E_Discriminant | |
| 1604 | then | |
| 1605 | -- Check for error of component clause given for variable | |
| 1606 | -- sized type. We have to delay this test till this point, | |
| 1607 | -- since the component type has to be frozen for us to know | |
| 1608 | -- if it is variable length. We omit this test in a generic | |
| 1609 | -- context, it will be applied at instantiation time. | |
| 1610 | ||
| 1611 | declare | |
| 1612 | CC : constant Node_Id := Component_Clause (Comp); | |
| 1613 | ||
| 1614 | begin | |
| 1615 | if Present (CC) then | |
| 1616 | Placed_Component := True; | |
| 1617 | ||
| 07fc65c4 GB |
1618 | if Inside_A_Generic then |
| 1619 | null; | |
| 1620 | ||
| 1621 | elsif not Size_Known_At_Compile_Time | |
| 70482933 | 1622 | (Underlying_Type (Etype (Comp))) |
| 70482933 RK |
1623 | then |
| 1624 | Error_Msg_N | |
| 1625 | ("component clause not allowed for variable " & | |
| 1626 | "length component", CC); | |
| 1627 | end if; | |
| 1628 | ||
| 1629 | else | |
| 1630 | Unplaced_Component := True; | |
| 1631 | end if; | |
| 1632 | end; | |
| 1633 | ||
| 1634 | -- If component clause is present, then deal with the | |
| 1635 | -- non-default bit order case. We cannot do this before | |
| 1636 | -- the freeze point, because there is no required order | |
| 1637 | -- for the component clause and the bit_order clause. | |
| 1638 | ||
| 1639 | -- We only do this processing for the base type, and in | |
| 1640 | -- fact that's important, since otherwise if there are | |
| 1641 | -- record subtypes, we could reverse the bits once for | |
| 1642 | -- each subtype, which would be incorrect. | |
| 1643 | ||
| 1644 | if Present (Component_Clause (Comp)) | |
| 1645 | and then Reverse_Bit_Order (Rec) | |
| 1646 | and then Ekind (E) = E_Record_Type | |
| 1647 | then | |
| 1648 | declare | |
| 1649 | CFB : constant Uint := Component_Bit_Offset (Comp); | |
| 1650 | CSZ : constant Uint := Esize (Comp); | |
| 1651 | CLC : constant Node_Id := Component_Clause (Comp); | |
| 1652 | Pos : constant Node_Id := Position (CLC); | |
| 1653 | FB : constant Node_Id := First_Bit (CLC); | |
| 1654 | ||
| 1655 | Storage_Unit_Offset : constant Uint := | |
| 1656 | CFB / System_Storage_Unit; | |
| 1657 | ||
| 1658 | Start_Bit : constant Uint := | |
| 1659 | CFB mod System_Storage_Unit; | |
| 1660 | ||
| 1661 | begin | |
| 1662 | -- Cases where field goes over storage unit boundary | |
| 1663 | ||
| 1664 | if Start_Bit + CSZ > System_Storage_Unit then | |
| 1665 | ||
| 1666 | -- Allow multi-byte field but generate warning | |
| 1667 | ||
| 1668 | if Start_Bit mod System_Storage_Unit = 0 | |
| 1669 | and then CSZ mod System_Storage_Unit = 0 | |
| 1670 | then | |
| 1671 | Error_Msg_N | |
| 1672 | ("multi-byte field specified with non-standard" | |
| 1673 | & " Bit_Order?", CLC); | |
| 1674 | ||
| 1675 | if Bytes_Big_Endian then | |
| 1676 | Error_Msg_N | |
| 1677 | ("bytes are not reversed " | |
| 1678 | & "(component is big-endian)?", CLC); | |
| 1679 | else | |
| 1680 | Error_Msg_N | |
| 1681 | ("bytes are not reversed " | |
| 1682 | & "(component is little-endian)?", CLC); | |
| 1683 | end if; | |
| 1684 | ||
| 1685 | -- Do not allow non-contiguous field | |
| 1686 | ||
| 1687 | else | |
| 1688 | Error_Msg_N | |
| 1689 | ("attempt to specify non-contiguous field" | |
| 1690 | & " not permitted", CLC); | |
| 1691 | Error_Msg_N | |
| 1692 | ("\(caused by non-standard Bit_Order " | |
| 1693 | & "specified)", CLC); | |
| 1694 | end if; | |
| 1695 | ||
| 1696 | -- Case where field fits in one storage unit | |
| 1697 | ||
| 1698 | else | |
| 1699 | -- Give warning if suspicious component clause | |
| 1700 | ||
| 1701 | if Intval (FB) >= System_Storage_Unit then | |
| 1702 | Error_Msg_N | |
| 1703 | ("?Bit_Order clause does not affect " & | |
| 1704 | "byte ordering", Pos); | |
| 1705 | Error_Msg_Uint_1 := | |
| 1706 | Intval (Pos) + Intval (FB) / System_Storage_Unit; | |
| 1707 | Error_Msg_N | |
| 1708 | ("?position normalized to ^ before bit " & | |
| 1709 | "order interpreted", Pos); | |
| 1710 | end if; | |
| 1711 | ||
| 1712 | -- Here is where we fix up the Component_Bit_Offset | |
| 1713 | -- value to account for the reverse bit order. | |
| 1714 | -- Some examples of what needs to be done are: | |
| 1715 | ||
| 1716 | -- First_Bit .. Last_Bit Component_Bit_Offset | |
| 1717 | -- old new old new | |
| 1718 | ||
| 1719 | -- 0 .. 0 7 .. 7 0 7 | |
| 1720 | -- 0 .. 1 6 .. 7 0 6 | |
| 1721 | -- 0 .. 2 5 .. 7 0 5 | |
| 1722 | -- 0 .. 7 0 .. 7 0 4 | |
| 1723 | ||
| 1724 | -- 1 .. 1 6 .. 6 1 6 | |
| 1725 | -- 1 .. 4 3 .. 6 1 3 | |
| 1726 | -- 4 .. 7 0 .. 3 4 0 | |
| 1727 | ||
| 1728 | -- The general rule is that the first bit is | |
| 1729 | -- is obtained by subtracting the old ending bit | |
| 1730 | -- from storage_unit - 1. | |
| 1731 | ||
| 1732 | Set_Component_Bit_Offset (Comp, | |
| 1733 | (Storage_Unit_Offset * System_Storage_Unit) | |
| 1734 | + (System_Storage_Unit - 1) | |
| 1735 | - (Start_Bit + CSZ - 1)); | |
| 1736 | ||
| 1737 | Set_Normalized_First_Bit (Comp, | |
| 1738 | Component_Bit_Offset (Comp) mod System_Storage_Unit); | |
| 1739 | end if; | |
| 1740 | end; | |
| 1741 | end if; | |
| 1742 | end if; | |
| 1743 | ||
| 1744 | Next_Entity (Comp); | |
| 1745 | end loop; | |
| 1746 | ||
| 1747 | -- Check for useless pragma Bit_Order | |
| 1748 | ||
| 1749 | if not Placed_Component and then Reverse_Bit_Order (Rec) then | |
| 1750 | ADC := Get_Attribute_Definition_Clause (Rec, Attribute_Bit_Order); | |
| 1751 | Error_Msg_N ("?Bit_Order specification has no effect", ADC); | |
| 1752 | Error_Msg_N ("\?since no component clauses were specified", ADC); | |
| 1753 | end if; | |
| 1754 | ||
| 1755 | -- Check for useless pragma Pack when all components placed | |
| 1756 | ||
| 1757 | if Is_Packed (Rec) | |
| 1758 | and then not Unplaced_Component | |
| 1759 | and then Warn_On_Redundant_Constructs | |
| 1760 | then | |
| 1761 | Error_Msg_N | |
| 1762 | ("?pragma Pack has no effect, no unplaced components", | |
| 1763 | Get_Rep_Pragma (Rec, Name_Pack)); | |
| 1764 | Set_Is_Packed (Rec, False); | |
| 1765 | end if; | |
| 1766 | ||
| 1767 | -- If this is the record corresponding to a remote type, | |
| 1768 | -- freeze the remote type here since that is what we are | |
| fbf5a39b AC |
1769 | -- semantically freezing. This prevents having the freeze |
| 1770 | -- node for that type in an inner scope. | |
| 70482933 RK |
1771 | |
| 1772 | -- Also, Check for controlled components and unchecked unions. | |
| 1773 | -- Finally, enforce the restriction that access attributes with | |
| 1774 | -- a current instance prefix can only apply to limited types. | |
| 1775 | ||
| 1776 | if Ekind (Rec) = E_Record_Type then | |
| 70482933 RK |
1777 | if Present (Corresponding_Remote_Type (Rec)) then |
| 1778 | Freeze_And_Append | |
| 1779 | (Corresponding_Remote_Type (Rec), Loc, Result); | |
| 1780 | end if; | |
| 1781 | ||
| 1782 | Comp := First_Component (Rec); | |
| 70482933 RK |
1783 | while Present (Comp) loop |
| 1784 | if Has_Controlled_Component (Etype (Comp)) | |
| 1785 | or else (Chars (Comp) /= Name_uParent | |
| 1786 | and then Is_Controlled (Etype (Comp))) | |
| 1787 | or else (Is_Protected_Type (Etype (Comp)) | |
| 1788 | and then Present | |
| 1789 | (Corresponding_Record_Type (Etype (Comp))) | |
| 1790 | and then Has_Controlled_Component | |
| 1791 | (Corresponding_Record_Type (Etype (Comp)))) | |
| 1792 | then | |
| 1793 | Set_Has_Controlled_Component (Rec); | |
| 1794 | exit; | |
| 1795 | end if; | |
| 1796 | ||
| 1797 | if Has_Unchecked_Union (Etype (Comp)) then | |
| 1798 | Set_Has_Unchecked_Union (Rec); | |
| 1799 | end if; | |
| 1800 | ||
| 1801 | if Has_Per_Object_Constraint (Comp) | |
| 1802 | and then not Is_Limited_Type (Rec) | |
| 1803 | then | |
| 1804 | -- Scan component declaration for likely misuses of | |
| 1805 | -- current instance, either in a constraint or in a | |
| 1806 | -- default expression. | |
| 1807 | ||
| 1808 | Check_Current_Instance (Parent (Comp)); | |
| 1809 | end if; | |
| 1810 | ||
| 1811 | Next_Component (Comp); | |
| 1812 | end loop; | |
| 1813 | end if; | |
| 1814 | ||
| 1815 | Set_Component_Alignment_If_Not_Set (Rec); | |
| 1816 | ||
| 1817 | -- For first subtypes, check if there are any fixed-point | |
| 1818 | -- fields with component clauses, where we must check the size. | |
| 1819 | -- This is not done till the freeze point, since for fixed-point | |
| 1820 | -- types, we do not know the size until the type is frozen. | |
| d05ef0ab | 1821 | -- Similar processing applies to bit packed arrays. |
| 70482933 RK |
1822 | |
| 1823 | if Is_First_Subtype (Rec) then | |
| 1824 | Comp := First_Component (Rec); | |
| 1825 | ||
| 1826 | while Present (Comp) loop | |
| 1827 | if Present (Component_Clause (Comp)) | |
| d05ef0ab AC |
1828 | and then (Is_Fixed_Point_Type (Etype (Comp)) |
| 1829 | or else | |
| 1830 | Is_Bit_Packed_Array (Etype (Comp))) | |
| 70482933 RK |
1831 | then |
| 1832 | Check_Size | |
| d05ef0ab | 1833 | (Component_Name (Component_Clause (Comp)), |
| 70482933 RK |
1834 | Etype (Comp), |
| 1835 | Esize (Comp), | |
| 1836 | Junk); | |
| 1837 | end if; | |
| 1838 | ||
| 1839 | Next_Component (Comp); | |
| 1840 | end loop; | |
| 1841 | end if; | |
| 1842 | end Freeze_Record_Type; | |
| 1843 | ||
| 1844 | -- Start of processing for Freeze_Entity | |
| 1845 | ||
| 1846 | begin | |
| fbf5a39b | 1847 | -- Do not freeze if already frozen since we only need one freeze node |
| 70482933 RK |
1848 | |
| 1849 | if Is_Frozen (E) then | |
| 1850 | return No_List; | |
| 1851 | ||
| 1852 | -- It is improper to freeze an external entity within a generic | |
| 1853 | -- because its freeze node will appear in a non-valid context. | |
| 1854 | -- ??? We should probably freeze the entity at that point and insert | |
| 1855 | -- the freeze node in a proper place but this proper place is not | |
| 1856 | -- easy to find, and the proper scope is not easy to restore. For | |
| 1857 | -- now, just wait to get out of the generic to freeze ??? | |
| 1858 | ||
| 1859 | elsif Inside_A_Generic and then External_Ref_In_Generic (E) then | |
| 1860 | return No_List; | |
| 1861 | ||
| 1862 | -- Do not freeze a global entity within an inner scope created during | |
| 1863 | -- expansion. A call to subprogram E within some internal procedure | |
| 1864 | -- (a stream attribute for example) might require freezing E, but the | |
| 1865 | -- freeze node must appear in the same declarative part as E itself. | |
| 1866 | -- The two-pass elaboration mechanism in gigi guarantees that E will | |
| 1867 | -- be frozen before the inner call is elaborated. We exclude constants | |
| 1868 | -- from this test, because deferred constants may be frozen early, and | |
| 1869 | -- must be diagnosed (see e.g. 1522-005). If the enclosing subprogram | |
| 1870 | -- comes from source, or is a generic instance, then the freeze point | |
| 1871 | -- is the one mandated by the language. and we freze the entity. | |
| 1872 | ||
| 1873 | elsif In_Open_Scopes (Scope (E)) | |
| 1874 | and then Scope (E) /= Current_Scope | |
| 1875 | and then Ekind (E) /= E_Constant | |
| 1876 | then | |
| 1877 | declare | |
| 1878 | S : Entity_Id := Current_Scope; | |
| 1879 | ||
| 1880 | begin | |
| 1881 | while Present (S) loop | |
| 1882 | if Is_Overloadable (S) then | |
| 1883 | if Comes_From_Source (S) | |
| 1884 | or else Is_Generic_Instance (S) | |
| 1885 | then | |
| 1886 | exit; | |
| 1887 | else | |
| 1888 | return No_List; | |
| 1889 | end if; | |
| 1890 | end if; | |
| 1891 | ||
| 1892 | S := Scope (S); | |
| 1893 | end loop; | |
| 1894 | end; | |
| 1895 | end if; | |
| 1896 | ||
| 1897 | -- Here to freeze the entity | |
| 1898 | ||
| 1899 | Result := No_List; | |
| 1900 | Set_Is_Frozen (E); | |
| 1901 | ||
| 1902 | -- Case of entity being frozen is other than a type | |
| 1903 | ||
| 1904 | if not Is_Type (E) then | |
| 1905 | ||
| 1906 | -- If entity is exported or imported and does not have an external | |
| 1907 | -- name, now is the time to provide the appropriate default name. | |
| 1908 | -- Skip this if the entity is stubbed, since we don't need a name | |
| 1909 | -- for any stubbed routine. | |
| 1910 | ||
| 1911 | if (Is_Imported (E) or else Is_Exported (E)) | |
| 1912 | and then No (Interface_Name (E)) | |
| 1913 | and then Convention (E) /= Convention_Stubbed | |
| 1914 | then | |
| 1915 | Set_Encoded_Interface_Name | |
| 1916 | (E, Get_Default_External_Name (E)); | |
| fbf5a39b AC |
1917 | |
| 1918 | -- Special processing for atomic objects appearing in object decls | |
| 1919 | ||
| 1920 | elsif Is_Atomic (E) | |
| 1921 | and then Nkind (Parent (E)) = N_Object_Declaration | |
| 1922 | and then Present (Expression (Parent (E))) | |
| 1923 | then | |
| 1924 | declare | |
| 1925 | Expr : constant Node_Id := Expression (Parent (E)); | |
| 1926 | ||
| 1927 | begin | |
| 1928 | -- If expression is an aggregate, assign to a temporary to | |
| 1929 | -- ensure that the actual assignment is done atomically rather | |
| 1930 | -- than component-wise (the assignment to the temp may be done | |
| 1931 | -- component-wise, but that is harmless. | |
| 1932 | ||
| 1933 | if Nkind (Expr) = N_Aggregate then | |
| 1934 | Expand_Atomic_Aggregate (Expr, Etype (E)); | |
| 1935 | ||
| 1936 | -- If the expression is a reference to a record or array | |
| 1937 | -- object entity, then reset Is_True_Constant to False so | |
| 1938 | -- that the compiler will not optimize away the intermediate | |
| 1939 | -- object, which we need in this case for the same reason | |
| 1940 | -- (to ensure that the actual assignment is atomic, rather | |
| 1941 | -- than component-wise). | |
| 1942 | ||
| 1943 | elsif Is_Entity_Name (Expr) | |
| 1944 | and then (Is_Record_Type (Etype (Expr)) | |
| 1945 | or else | |
| 1946 | Is_Array_Type (Etype (Expr))) | |
| 1947 | then | |
| 1948 | Set_Is_True_Constant (Entity (Expr), False); | |
| 1949 | end if; | |
| 1950 | end; | |
| 70482933 RK |
1951 | end if; |
| 1952 | ||
| 1953 | -- For a subprogram, freeze all parameter types and also the return | |
| fbf5a39b | 1954 | -- type (RM 13.14(14)). However skip this for internal subprograms. |
| 70482933 RK |
1955 | -- This is also the point where any extra formal parameters are |
| 1956 | -- created since we now know whether the subprogram will use | |
| 1957 | -- a foreign convention. | |
| 1958 | ||
| 1959 | if Is_Subprogram (E) then | |
| 70482933 | 1960 | if not Is_Internal (E) then |
| 70482933 RK |
1961 | declare |
| 1962 | F_Type : Entity_Id; | |
| 1963 | ||
| 1964 | function Is_Fat_C_Ptr_Type (T : Entity_Id) return Boolean; | |
| 1965 | -- Determines if given type entity is a fat pointer type | |
| 1966 | -- used as an argument type or return type to a subprogram | |
| 1967 | -- with C or C++ convention set. | |
| 1968 | ||
| 1969 | -------------------------- | |
| 1970 | -- Is_Fat_C_Access_Type -- | |
| 1971 | -------------------------- | |
| 1972 | ||
| 1973 | function Is_Fat_C_Ptr_Type (T : Entity_Id) return Boolean is | |
| 1974 | begin | |
| 1975 | return (Convention (E) = Convention_C | |
| 1976 | or else | |
| 1977 | Convention (E) = Convention_CPP) | |
| 1978 | and then Is_Access_Type (T) | |
| 1979 | and then Esize (T) > Ttypes.System_Address_Size; | |
| 1980 | end Is_Fat_C_Ptr_Type; | |
| 1981 | ||
| 1982 | begin | |
| 1983 | -- Loop through formals | |
| 1984 | ||
| 1985 | Formal := First_Formal (E); | |
| 1986 | ||
| 1987 | while Present (Formal) loop | |
| 70482933 RK |
1988 | F_Type := Etype (Formal); |
| 1989 | Freeze_And_Append (F_Type, Loc, Result); | |
| 1990 | ||
| 1991 | if Is_Private_Type (F_Type) | |
| 1992 | and then Is_Private_Type (Base_Type (F_Type)) | |
| 1993 | and then No (Full_View (Base_Type (F_Type))) | |
| 1994 | and then not Is_Generic_Type (F_Type) | |
| 1995 | and then not Is_Derived_Type (F_Type) | |
| 1996 | then | |
| 1997 | -- If the type of a formal is incomplete, subprogram | |
| 1998 | -- is being frozen prematurely. Within an instance | |
| 1999 | -- (but not within a wrapper package) this is an | |
| 2000 | -- an artifact of our need to regard the end of an | |
| 2001 | -- instantiation as a freeze point. Otherwise it is | |
| 2002 | -- a definite error. | |
| fbf5a39b | 2003 | |
| 70482933 RK |
2004 | -- and then not Is_Wrapper_Package (Current_Scope) ??? |
| 2005 | ||
| 2006 | if In_Instance then | |
| 2007 | Set_Is_Frozen (E, False); | |
| 2008 | return No_List; | |
| 2009 | ||
| 2010 | elsif not After_Last_Declaration then | |
| 2011 | Error_Msg_Node_1 := F_Type; | |
| 2012 | Error_Msg | |
| 2013 | ("type& must be fully defined before this point", | |
| 2014 | Loc); | |
| 2015 | end if; | |
| 2016 | end if; | |
| 2017 | ||
| 2018 | -- Check bad use of fat C pointer | |
| 2019 | ||
| fbf5a39b AC |
2020 | if Warn_On_Export_Import and then |
| 2021 | Is_Fat_C_Ptr_Type (F_Type) | |
| 2022 | then | |
| 70482933 RK |
2023 | Error_Msg_Qual_Level := 1; |
| 2024 | Error_Msg_N | |
| 2025 | ("?type of & does not correspond to C pointer", | |
| 2026 | Formal); | |
| 2027 | Error_Msg_Qual_Level := 0; | |
| 2028 | end if; | |
| 2029 | ||
| 2030 | -- Check for unconstrained array in exported foreign | |
| 2031 | -- convention case. | |
| 2032 | ||
| 2033 | if Convention (E) in Foreign_Convention | |
| 2034 | and then not Is_Imported (E) | |
| 2035 | and then Is_Array_Type (F_Type) | |
| 2036 | and then not Is_Constrained (F_Type) | |
| fbf5a39b | 2037 | and then Warn_On_Export_Import |
| 70482933 RK |
2038 | then |
| 2039 | Error_Msg_Qual_Level := 1; | |
| 2040 | Error_Msg_N | |
| 2041 | ("?type of argument& is unconstrained array", | |
| 2042 | Formal); | |
| 2043 | Error_Msg_N | |
| 2044 | ("?foreign caller must pass bounds explicitly", | |
| 2045 | Formal); | |
| 2046 | Error_Msg_Qual_Level := 0; | |
| 2047 | end if; | |
| 2048 | ||
| 2049 | Next_Formal (Formal); | |
| 2050 | end loop; | |
| 2051 | ||
| 2052 | -- Check return type | |
| 2053 | ||
| 2054 | if Ekind (E) = E_Function then | |
| 2055 | Freeze_And_Append (Etype (E), Loc, Result); | |
| 2056 | ||
| fbf5a39b AC |
2057 | if Warn_On_Export_Import |
| 2058 | and then Is_Fat_C_Ptr_Type (Etype (E)) | |
| 2059 | then | |
| 70482933 RK |
2060 | Error_Msg_N |
| 2061 | ("?return type of& does not correspond to C pointer", | |
| 2062 | E); | |
| 2063 | ||
| 2064 | elsif Is_Array_Type (Etype (E)) | |
| 2065 | and then not Is_Constrained (Etype (E)) | |
| 2066 | and then not Is_Imported (E) | |
| 2067 | and then Convention (E) in Foreign_Convention | |
| fbf5a39b | 2068 | and then Warn_On_Export_Import |
| 70482933 RK |
2069 | then |
| 2070 | Error_Msg_N | |
| fbf5a39b | 2071 | ("?foreign convention function& should not " & |
| 70482933 RK |
2072 | "return unconstrained array", E); |
| 2073 | end if; | |
| 2074 | end if; | |
| 2075 | end; | |
| 2076 | end if; | |
| 2077 | ||
| 2078 | -- Must freeze its parent first if it is a derived subprogram | |
| 2079 | ||
| 2080 | if Present (Alias (E)) then | |
| 2081 | Freeze_And_Append (Alias (E), Loc, Result); | |
| 2082 | end if; | |
| 2083 | ||
| 2084 | -- If the return type requires a transient scope, and we are on | |
| 2085 | -- a target allowing functions to return with a depressed stack | |
| 2086 | -- pointer, then we mark the function as requiring this treatment. | |
| 2087 | ||
| 2088 | if Ekind (E) = E_Function | |
| 2089 | and then Functions_Return_By_DSP_On_Target | |
| 2090 | and then Requires_Transient_Scope (Etype (E)) | |
| 2091 | then | |
| 2092 | Set_Function_Returns_With_DSP (E); | |
| 2093 | end if; | |
| 2094 | ||
| 2095 | if not Is_Internal (E) then | |
| 2096 | Freeze_Subprogram (E); | |
| 2097 | end if; | |
| 2098 | ||
| 2099 | -- Here for other than a subprogram or type | |
| 2100 | ||
| 2101 | else | |
| 2102 | -- If entity has a type, and it is not a generic unit, then | |
| 2103 | -- freeze it first (RM 13.14(10)) | |
| 2104 | ||
| 2105 | if Present (Etype (E)) | |
| 2106 | and then Ekind (E) /= E_Generic_Function | |
| 2107 | then | |
| 2108 | Freeze_And_Append (Etype (E), Loc, Result); | |
| 2109 | end if; | |
| 2110 | ||
| 2111 | -- For object created by object declaration, perform required | |
| 2112 | -- categorization (preelaborate and pure) checks. Defer these | |
| 2113 | -- checks to freeze time since pragma Import inhibits default | |
| 2114 | -- initialization and thus pragma Import affects these checks. | |
| 2115 | ||
| 2116 | if Nkind (Declaration_Node (E)) = N_Object_Declaration then | |
| 2117 | Validate_Object_Declaration (Declaration_Node (E)); | |
| fbf5a39b | 2118 | Check_Address_Clause (E); |
| 70482933 RK |
2119 | end if; |
| 2120 | ||
| 2121 | -- Check that a constant which has a pragma Volatile[_Components] | |
| 2122 | -- or Atomic[_Components] also has a pragma Import (RM C.6(13)) | |
| 2123 | ||
| 2124 | -- Note: Atomic[_Components] also sets Volatile[_Components] | |
| 2125 | ||
| 2126 | if Ekind (E) = E_Constant | |
| 2127 | and then (Has_Volatile_Components (E) or else Is_Volatile (E)) | |
| 2128 | and then not Is_Imported (E) | |
| 2129 | then | |
| 2130 | -- Make sure we actually have a pragma, and have not merely | |
| 2131 | -- inherited the indication from elsewhere (e.g. an address | |
| 2132 | -- clause, which is not good enough in RM terms!) | |
| 2133 | ||
| 91b1417d AC |
2134 | if Present (Get_Rep_Pragma (E, Name_Atomic)) |
| 2135 | or else | |
| 2136 | Present (Get_Rep_Pragma (E, Name_Atomic_Components)) | |
| 70482933 RK |
2137 | then |
| 2138 | Error_Msg_N | |
| 91b1417d AC |
2139 | ("stand alone atomic constant must be " & |
| 2140 | "imported ('R'M 'C.6(13))", E); | |
| 2141 | ||
| 2142 | elsif Present (Get_Rep_Pragma (E, Name_Volatile)) | |
| 2143 | or else | |
| 2144 | Present (Get_Rep_Pragma (E, Name_Volatile_Components)) | |
| 2145 | then | |
| 2146 | Error_Msg_N | |
| 2147 | ("stand alone volatile constant must be " & | |
| 2148 | "imported ('R'M 'C.6(13))", E); | |
| 70482933 RK |
2149 | end if; |
| 2150 | end if; | |
| 2151 | ||
| 2152 | -- Static objects require special handling | |
| 2153 | ||
| 2154 | if (Ekind (E) = E_Constant or else Ekind (E) = E_Variable) | |
| 2155 | and then Is_Statically_Allocated (E) | |
| 2156 | then | |
| 2157 | Freeze_Static_Object (E); | |
| 2158 | end if; | |
| 2159 | ||
| 2160 | -- Remaining step is to layout objects | |
| 2161 | ||
| 2162 | if Ekind (E) = E_Variable | |
| 2163 | or else | |
| 2164 | Ekind (E) = E_Constant | |
| 2165 | or else | |
| 2166 | Ekind (E) = E_Loop_Parameter | |
| 2167 | or else | |
| 2168 | Is_Formal (E) | |
| 2169 | then | |
| 2170 | Layout_Object (E); | |
| 2171 | end if; | |
| 2172 | end if; | |
| 2173 | ||
| 2174 | -- Case of a type or subtype being frozen | |
| 2175 | ||
| 2176 | else | |
| 2177 | -- The type may be defined in a generic unit. This can occur when | |
| 2178 | -- freezing a generic function that returns the type (which is | |
| 2179 | -- defined in a parent unit). It is clearly meaningless to freeze | |
| 2180 | -- this type. However, if it is a subtype, its size may be determi- | |
| 2181 | -- nable and used in subsequent checks, so might as well try to | |
| 2182 | -- compute it. | |
| 2183 | ||
| 2184 | if Present (Scope (E)) | |
| 2185 | and then Is_Generic_Unit (Scope (E)) | |
| 2186 | then | |
| 2187 | Check_Compile_Time_Size (E); | |
| 2188 | return No_List; | |
| 2189 | end if; | |
| 2190 | ||
| 2191 | -- Deal with special cases of freezing for subtype | |
| 2192 | ||
| 2193 | if E /= Base_Type (E) then | |
| 2194 | ||
| 2195 | -- If ancestor subtype present, freeze that first. | |
| 2196 | -- Note that this will also get the base type frozen. | |
| 2197 | ||
| 2198 | Atype := Ancestor_Subtype (E); | |
| 2199 | ||
| 2200 | if Present (Atype) then | |
| 2201 | Freeze_And_Append (Atype, Loc, Result); | |
| 2202 | ||
| 2203 | -- Otherwise freeze the base type of the entity before | |
| fbf5a39b | 2204 | -- freezing the entity itself, (RM 13.14(15)). |
| 70482933 RK |
2205 | |
| 2206 | elsif E /= Base_Type (E) then | |
| 2207 | Freeze_And_Append (Base_Type (E), Loc, Result); | |
| 2208 | end if; | |
| 2209 | ||
| fbf5a39b | 2210 | -- For a derived type, freeze its parent type first (RM 13.14(15)) |
| 70482933 RK |
2211 | |
| 2212 | elsif Is_Derived_Type (E) then | |
| 2213 | Freeze_And_Append (Etype (E), Loc, Result); | |
| 2214 | Freeze_And_Append (First_Subtype (Etype (E)), Loc, Result); | |
| 2215 | end if; | |
| 2216 | ||
| 2217 | -- For array type, freeze index types and component type first | |
| fbf5a39b | 2218 | -- before freezing the array (RM 13.14(15)). |
| 70482933 RK |
2219 | |
| 2220 | if Is_Array_Type (E) then | |
| 2221 | declare | |
| fbf5a39b AC |
2222 | Ctyp : constant Entity_Id := Component_Type (E); |
| 2223 | Pnod : Node_Id; | |
| 70482933 RK |
2224 | |
| 2225 | Non_Standard_Enum : Boolean := False; | |
| 2226 | -- Set true if any of the index types is an enumeration | |
| 2227 | -- type with a non-standard representation. | |
| 2228 | ||
| 2229 | begin | |
| 2230 | Freeze_And_Append (Ctyp, Loc, Result); | |
| 2231 | ||
| 2232 | Indx := First_Index (E); | |
| 2233 | while Present (Indx) loop | |
| 2234 | Freeze_And_Append (Etype (Indx), Loc, Result); | |
| 2235 | ||
| 2236 | if Is_Enumeration_Type (Etype (Indx)) | |
| 2237 | and then Has_Non_Standard_Rep (Etype (Indx)) | |
| 2238 | then | |
| 2239 | Non_Standard_Enum := True; | |
| 2240 | end if; | |
| 2241 | ||
| 2242 | Next_Index (Indx); | |
| 2243 | end loop; | |
| 2244 | ||
| 07fc65c4 | 2245 | -- Processing that is done only for base types |
| 70482933 RK |
2246 | |
| 2247 | if Ekind (E) = E_Array_Type then | |
| 07fc65c4 GB |
2248 | |
| 2249 | -- Propagate flags for component type | |
| 2250 | ||
| 70482933 RK |
2251 | if Is_Controlled (Component_Type (E)) |
| 2252 | or else Has_Controlled_Component (Ctyp) | |
| 2253 | then | |
| 2254 | Set_Has_Controlled_Component (E); | |
| 2255 | end if; | |
| 2256 | ||
| 2257 | if Has_Unchecked_Union (Component_Type (E)) then | |
| 2258 | Set_Has_Unchecked_Union (E); | |
| 2259 | end if; | |
| 70482933 | 2260 | |
| 07fc65c4 GB |
2261 | -- If packing was requested or if the component size was set |
| 2262 | -- explicitly, then see if bit packing is required. This | |
| 2263 | -- processing is only done for base types, since all the | |
| 2264 | -- representation aspects involved are type-related. This | |
| 2265 | -- is not just an optimization, if we start processing the | |
| 2266 | -- subtypes, they intefere with the settings on the base | |
| 2267 | -- type (this is because Is_Packed has a slightly different | |
| 2268 | -- meaning before and after freezing). | |
| 70482933 | 2269 | |
| 70482933 RK |
2270 | declare |
| 2271 | Csiz : Uint; | |
| 2272 | Esiz : Uint; | |
| 2273 | ||
| 2274 | begin | |
| 2275 | if (Is_Packed (E) or else Has_Pragma_Pack (E)) | |
| 2276 | and then not Has_Atomic_Components (E) | |
| 2277 | and then Known_Static_RM_Size (Ctyp) | |
| 2278 | then | |
| 2279 | Csiz := UI_Max (RM_Size (Ctyp), 1); | |
| 2280 | ||
| 2281 | elsif Known_Component_Size (E) then | |
| 2282 | Csiz := Component_Size (E); | |
| 2283 | ||
| 2284 | elsif not Known_Static_Esize (Ctyp) then | |
| 2285 | Csiz := Uint_0; | |
| 2286 | ||
| 2287 | else | |
| 2288 | Esiz := Esize (Ctyp); | |
| 2289 | ||
| 2290 | -- We can set the component size if it is less than | |
| 2291 | -- 16, rounding it up to the next storage unit size. | |
| 2292 | ||
| 2293 | if Esiz <= 8 then | |
| 2294 | Csiz := Uint_8; | |
| 2295 | elsif Esiz <= 16 then | |
| 2296 | Csiz := Uint_16; | |
| 2297 | else | |
| 2298 | Csiz := Uint_0; | |
| 2299 | end if; | |
| 2300 | ||
| 2301 | -- Set component size up to match alignment if | |
| 2302 | -- it would otherwise be less than the alignment. | |
| 2303 | -- This deals with cases of types whose alignment | |
| 2304 | -- exceeds their sizes (padded types). | |
| 2305 | ||
| 2306 | if Csiz /= 0 then | |
| 2307 | declare | |
| 2308 | A : constant Uint := Alignment_In_Bits (Ctyp); | |
| 2309 | ||
| 2310 | begin | |
| 2311 | if Csiz < A then | |
| 2312 | Csiz := A; | |
| 2313 | end if; | |
| 2314 | end; | |
| 2315 | end if; | |
| 2316 | ||
| 2317 | end if; | |
| 2318 | ||
| 2319 | if 1 <= Csiz and then Csiz <= 64 then | |
| 2320 | ||
| 2321 | -- We set the component size for all cases 1-64 | |
| 2322 | ||
| 2323 | Set_Component_Size (Base_Type (E), Csiz); | |
| 2324 | ||
| fbf5a39b AC |
2325 | -- Check for base type of 8,16,32 bits, where the |
| 2326 | -- subtype has a length one less than the base type | |
| 2327 | -- and is unsigned (e.g. Natural subtype of Integer) | |
| 2328 | ||
| 2329 | -- In such cases, if a component size was not set | |
| 2330 | -- explicitly, then generate a warning. | |
| 2331 | ||
| 2332 | if Has_Pragma_Pack (E) | |
| 2333 | and then not Has_Component_Size_Clause (E) | |
| 2334 | and then | |
| 2335 | (Csiz = 7 or else Csiz = 15 or else Csiz = 31) | |
| 2336 | and then Esize (Base_Type (Ctyp)) = Csiz + 1 | |
| 2337 | then | |
| 2338 | Error_Msg_Uint_1 := Csiz; | |
| 2339 | Pnod := | |
| 2340 | Get_Rep_Pragma (First_Subtype (E), Name_Pack); | |
| 2341 | ||
| 2342 | if Present (Pnod) then | |
| 2343 | Error_Msg_N | |
| 2344 | ("pragma Pack causes component size to be ^?", | |
| 2345 | Pnod); | |
| 2346 | Error_Msg_N | |
| 2347 | ("\use Component_Size to set desired value", | |
| 2348 | Pnod); | |
| 2349 | end if; | |
| 2350 | end if; | |
| 2351 | ||
| 70482933 RK |
2352 | -- Actual packing is not needed for 8,16,32,64 |
| 2353 | -- Also not needed for 24 if alignment is 1 | |
| 2354 | ||
| 2355 | if Csiz = 8 | |
| 2356 | or else Csiz = 16 | |
| 2357 | or else Csiz = 32 | |
| 2358 | or else Csiz = 64 | |
| 2359 | or else (Csiz = 24 and then Alignment (Ctyp) = 1) | |
| 2360 | then | |
| 2361 | -- Here the array was requested to be packed, but | |
| 2362 | -- the packing request had no effect, so Is_Packed | |
| 2363 | -- is reset. | |
| 2364 | ||
| 2365 | -- Note: semantically this means that we lose | |
| 2366 | -- track of the fact that a derived type inherited | |
| 2367 | -- a pack pragma that was non-effective, but that | |
| 2368 | -- seems fine. | |
| 2369 | ||
| 2370 | -- We regard a Pack pragma as a request to set a | |
| 2371 | -- representation characteristic, and this request | |
| 2372 | -- may be ignored. | |
| 2373 | ||
| 2374 | Set_Is_Packed (Base_Type (E), False); | |
| 2375 | ||
| 2376 | -- In all other cases, packing is indeed needed | |
| 2377 | ||
| 2378 | else | |
| 2379 | Set_Has_Non_Standard_Rep (Base_Type (E)); | |
| 2380 | Set_Is_Bit_Packed_Array (Base_Type (E)); | |
| 2381 | Set_Is_Packed (Base_Type (E)); | |
| 2382 | end if; | |
| 2383 | end if; | |
| 2384 | end; | |
| 07fc65c4 GB |
2385 | |
| 2386 | -- Processing that is done only for subtypes | |
| 2387 | ||
| 2388 | else | |
| 2389 | -- Acquire alignment from base type | |
| 2390 | ||
| 2391 | if Unknown_Alignment (E) then | |
| 2392 | Set_Alignment (E, Alignment (Base_Type (E))); | |
| 2393 | end if; | |
| 2394 | end if; | |
| 2395 | ||
| d05ef0ab AC |
2396 | -- For bit-packed arrays, check the size |
| 2397 | ||
| 2398 | if Is_Bit_Packed_Array (E) | |
| 2399 | and then Known_Esize (E) | |
| 2400 | then | |
| 2401 | declare | |
| 2402 | Discard : Boolean; | |
| 2403 | SizC : constant Node_Id := Size_Clause (E); | |
| 2404 | ||
| 2405 | begin | |
| 2406 | -- It is not clear if it is possible to have no size | |
| 2407 | -- clause at this stage, but this is not worth worrying | |
| 2408 | -- about. Post the error on the entity name in the size | |
| 2409 | -- clause if present, else on the type entity itself. | |
| 2410 | ||
| 2411 | if Present (SizC) then | |
| 2412 | Check_Size (Name (SizC), E, Esize (E), Discard); | |
| 2413 | else | |
| 2414 | Check_Size (E, E, Esize (E), Discard); | |
| 2415 | end if; | |
| 2416 | end; | |
| 2417 | end if; | |
| 2418 | ||
| 07fc65c4 GB |
2419 | -- Check one common case of a size given where the array |
| 2420 | -- needs to be packed, but was not so the size cannot be | |
| 2421 | -- honored. This would of course be caught by the backend, | |
| 2422 | -- and indeed we don't catch all cases. The point is that | |
| 2423 | -- we can give a better error message in those cases that | |
| 2424 | -- we do catch with the circuitry here. | |
| 2425 | ||
| fbf5a39b AC |
2426 | declare |
| 2427 | Lo, Hi : Node_Id; | |
| 2428 | Ctyp : constant Entity_Id := Component_Type (E); | |
| 07fc65c4 | 2429 | |
| fbf5a39b AC |
2430 | begin |
| 2431 | if Present (Size_Clause (E)) | |
| 2432 | and then Known_Static_Esize (E) | |
| 2433 | and then not Is_Bit_Packed_Array (E) | |
| 2434 | and then not Has_Pragma_Pack (E) | |
| 2435 | and then Number_Dimensions (E) = 1 | |
| 2436 | and then not Has_Component_Size_Clause (E) | |
| 2437 | and then Known_Static_Esize (Ctyp) | |
| 2438 | then | |
| 07fc65c4 GB |
2439 | Get_Index_Bounds (First_Index (E), Lo, Hi); |
| 2440 | ||
| 2441 | if Compile_Time_Known_Value (Lo) | |
| 2442 | and then Compile_Time_Known_Value (Hi) | |
| 2443 | and then Known_Static_RM_Size (Ctyp) | |
| 2444 | and then RM_Size (Ctyp) < 64 | |
| 2445 | then | |
| 2446 | declare | |
| fbf5a39b AC |
2447 | Lov : constant Uint := Expr_Value (Lo); |
| 2448 | Hiv : constant Uint := Expr_Value (Hi); | |
| 2449 | Len : constant Uint := | |
| 2450 | UI_Max (Uint_0, Hiv - Lov + 1); | |
| 2451 | Rsiz : constant Uint := RM_Size (Ctyp); | |
| 2452 | ||
| 2453 | -- What we are looking for here is the situation | |
| 2454 | -- where the Esize given would be exactly right | |
| 2455 | -- if there was a pragma Pack (resulting in the | |
| 2456 | -- component size being the same as the RM_Size). | |
| 2457 | -- Furthermore, the component type size must be | |
| 2458 | -- an odd size (not a multiple of storage unit) | |
| 07fc65c4 GB |
2459 | |
| 2460 | begin | |
| fbf5a39b AC |
2461 | if Esize (E) = Len * Rsiz |
| 2462 | and then Rsiz mod System_Storage_Unit /= 0 | |
| 07fc65c4 GB |
2463 | then |
| 2464 | Error_Msg_NE | |
| 2465 | ("size given for& too small", | |
| 2466 | Size_Clause (E), E); | |
| 2467 | Error_Msg_N | |
| 2468 | ("\explicit pragma Pack is required", | |
| 2469 | Size_Clause (E)); | |
| 2470 | end if; | |
| 2471 | end; | |
| 2472 | end if; | |
| fbf5a39b AC |
2473 | end if; |
| 2474 | end; | |
| 70482933 RK |
2475 | |
| 2476 | -- If any of the index types was an enumeration type with | |
| 2477 | -- a non-standard rep clause, then we indicate that the | |
| 2478 | -- array type is always packed (even if it is not bit packed). | |
| 2479 | ||
| 2480 | if Non_Standard_Enum then | |
| 2481 | Set_Has_Non_Standard_Rep (Base_Type (E)); | |
| 2482 | Set_Is_Packed (Base_Type (E)); | |
| 2483 | end if; | |
| 2484 | end; | |
| 2485 | ||
| 2486 | Set_Component_Alignment_If_Not_Set (E); | |
| 2487 | ||
| 2488 | -- If the array is packed, we must create the packed array | |
| 2489 | -- type to be used to actually implement the type. This is | |
| 2490 | -- only needed for real array types (not for string literal | |
| 2491 | -- types, since they are present only for the front end). | |
| 2492 | ||
| 2493 | if Is_Packed (E) | |
| 2494 | and then Ekind (E) /= E_String_Literal_Subtype | |
| 2495 | then | |
| 2496 | Create_Packed_Array_Type (E); | |
| 2497 | Freeze_And_Append (Packed_Array_Type (E), Loc, Result); | |
| 2498 | ||
| 2499 | -- Size information of packed array type is copied to the | |
| 2500 | -- array type, since this is really the representation. | |
| 2501 | ||
| 2502 | Set_Size_Info (E, Packed_Array_Type (E)); | |
| 2503 | Set_RM_Size (E, RM_Size (Packed_Array_Type (E))); | |
| 2504 | end if; | |
| 2505 | ||
| fbf5a39b AC |
2506 | -- For a class-wide type, the corresponding specific type is |
| 2507 | -- frozen as well (RM 13.14(15)) | |
| 70482933 RK |
2508 | |
| 2509 | elsif Is_Class_Wide_Type (E) then | |
| 2510 | Freeze_And_Append (Root_Type (E), Loc, Result); | |
| 2511 | ||
| 2512 | -- If the Class_Wide_Type is an Itype (when type is the anonymous | |
| 2513 | -- parent of a derived type) and it is a library-level entity, | |
| 2514 | -- generate an itype reference for it. Otherwise, its first | |
| 2515 | -- explicit reference may be in an inner scope, which will be | |
| 2516 | -- rejected by the back-end. | |
| 2517 | ||
| 2518 | if Is_Itype (E) | |
| 2519 | and then Is_Compilation_Unit (Scope (E)) | |
| 2520 | then | |
| 70482933 | 2521 | declare |
| fbf5a39b | 2522 | Ref : constant Node_Id := Make_Itype_Reference (Loc); |
| 70482933 RK |
2523 | |
| 2524 | begin | |
| 2525 | Set_Itype (Ref, E); | |
| 2526 | if No (Result) then | |
| 2527 | Result := New_List (Ref); | |
| 2528 | else | |
| 2529 | Append (Ref, Result); | |
| 2530 | end if; | |
| 2531 | end; | |
| 2532 | end if; | |
| 2533 | ||
| fbf5a39b AC |
2534 | -- The equivalent type associated with a class-wide subtype |
| 2535 | -- needs to be frozen to ensure that its layout is done. | |
| 2536 | -- Class-wide subtypes are currently only frozen on targets | |
| 2537 | -- requiring front-end layout (see New_Class_Wide_Subtype | |
| 2538 | -- and Make_CW_Equivalent_Type in exp_util.adb). | |
| 2539 | ||
| 2540 | if Ekind (E) = E_Class_Wide_Subtype | |
| 2541 | and then Present (Equivalent_Type (E)) | |
| 2542 | then | |
| 2543 | Freeze_And_Append (Equivalent_Type (E), Loc, Result); | |
| 2544 | end if; | |
| 2545 | ||
| 2546 | -- For a record (sub)type, freeze all the component types (RM | |
| 2547 | -- 13.14(15). We test for E_Record_(sub)Type here, rather than | |
| 70482933 RK |
2548 | -- using Is_Record_Type, because we don't want to attempt the |
| 2549 | -- freeze for the case of a private type with record extension | |
| 2550 | -- (we will do that later when the full type is frozen). | |
| 2551 | ||
| 2552 | elsif Ekind (E) = E_Record_Type | |
| 2553 | or else Ekind (E) = E_Record_Subtype | |
| 2554 | then | |
| 2555 | Freeze_Record_Type (E); | |
| 2556 | ||
| 2557 | -- For a concurrent type, freeze corresponding record type. This | |
| 2558 | -- does not correpond to any specific rule in the RM, but the | |
| 2559 | -- record type is essentially part of the concurrent type. | |
| 2560 | -- Freeze as well all local entities. This includes record types | |
| 2561 | -- created for entry parameter blocks, and whatever local entities | |
| 2562 | -- may appear in the private part. | |
| 2563 | ||
| 2564 | elsif Is_Concurrent_Type (E) then | |
| 2565 | if Present (Corresponding_Record_Type (E)) then | |
| 2566 | Freeze_And_Append | |
| 2567 | (Corresponding_Record_Type (E), Loc, Result); | |
| 2568 | end if; | |
| 2569 | ||
| 2570 | Comp := First_Entity (E); | |
| 2571 | ||
| 2572 | while Present (Comp) loop | |
| 2573 | if Is_Type (Comp) then | |
| 2574 | Freeze_And_Append (Comp, Loc, Result); | |
| 2575 | ||
| 2576 | elsif (Ekind (Comp)) /= E_Function then | |
| 2577 | Freeze_And_Append (Etype (Comp), Loc, Result); | |
| 2578 | end if; | |
| 2579 | ||
| 2580 | Next_Entity (Comp); | |
| 2581 | end loop; | |
| 2582 | ||
| 2583 | -- Private types are required to point to the same freeze node | |
| 2584 | -- as their corresponding full views. The freeze node itself | |
| 2585 | -- has to point to the partial view of the entity (because | |
| 2586 | -- from the partial view, we can retrieve the full view, but | |
| 2587 | -- not the reverse). However, in order to freeze correctly, | |
| 2588 | -- we need to freeze the full view. If we are freezing at the | |
| 2589 | -- end of a scope (or within the scope of the private type), | |
| 2590 | -- the partial and full views will have been swapped, the | |
| 2591 | -- full view appears first in the entity chain and the swapping | |
| fbf5a39b | 2592 | -- mechanism ensures that the pointers are properly set (on |
| 70482933 RK |
2593 | -- scope exit). |
| 2594 | ||
| 2595 | -- If we encounter the partial view before the full view | |
| 2596 | -- (e.g. when freezing from another scope), we freeze the | |
| 2597 | -- full view, and then set the pointers appropriately since | |
| 2598 | -- we cannot rely on swapping to fix things up (subtypes in an | |
| 2599 | -- outer scope might not get swapped). | |
| 2600 | ||
| 2601 | elsif Is_Incomplete_Or_Private_Type (E) | |
| 2602 | and then not Is_Generic_Type (E) | |
| 2603 | then | |
| 2604 | -- Case of full view present | |
| 2605 | ||
| 2606 | if Present (Full_View (E)) then | |
| 2607 | ||
| 2608 | -- If full view has already been frozen, then no | |
| 2609 | -- further processing is required | |
| 2610 | ||
| 2611 | if Is_Frozen (Full_View (E)) then | |
| 2612 | ||
| 2613 | Set_Has_Delayed_Freeze (E, False); | |
| 2614 | Set_Freeze_Node (E, Empty); | |
| 2615 | Check_Debug_Info_Needed (E); | |
| 2616 | ||
| 2617 | -- Otherwise freeze full view and patch the pointers | |
| fbf5a39b AC |
2618 | -- so that the freeze node will elaborate both views |
| 2619 | -- in the back-end. | |
| 70482933 RK |
2620 | |
| 2621 | else | |
| fbf5a39b AC |
2622 | declare |
| 2623 | Full : constant Entity_Id := Full_View (E); | |
| 70482933 | 2624 | |
| fbf5a39b AC |
2625 | begin |
| 2626 | if Is_Private_Type (Full) | |
| 2627 | and then Present (Underlying_Full_View (Full)) | |
| 2628 | then | |
| 2629 | Freeze_And_Append | |
| 2630 | (Underlying_Full_View (Full), Loc, Result); | |
| 2631 | end if; | |
| 70482933 | 2632 | |
| fbf5a39b | 2633 | Freeze_And_Append (Full, Loc, Result); |
| 70482933 | 2634 | |
| fbf5a39b AC |
2635 | if Has_Delayed_Freeze (E) then |
| 2636 | F_Node := Freeze_Node (Full); | |
| 70482933 | 2637 | |
| fbf5a39b AC |
2638 | if Present (F_Node) then |
| 2639 | Set_Freeze_Node (E, F_Node); | |
| 2640 | Set_Entity (F_Node, E); | |
| 2641 | ||
| 2642 | else | |
| 2643 | -- {Incomplete,Private}_Subtypes | |
| 2644 | -- with Full_Views constrained by discriminants | |
| 2645 | ||
| 2646 | Set_Has_Delayed_Freeze (E, False); | |
| 2647 | Set_Freeze_Node (E, Empty); | |
| 2648 | end if; | |
| 70482933 | 2649 | end if; |
| fbf5a39b | 2650 | end; |
| 70482933 RK |
2651 | |
| 2652 | Check_Debug_Info_Needed (E); | |
| 2653 | end if; | |
| 2654 | ||
| 2655 | -- AI-117 requires that the convention of a partial view | |
| 2656 | -- be the same as the convention of the full view. Note | |
| 2657 | -- that this is a recognized breach of privacy, but it's | |
| 2658 | -- essential for logical consistency of representation, | |
| 2659 | -- and the lack of a rule in RM95 was an oversight. | |
| 2660 | ||
| 2661 | Set_Convention (E, Convention (Full_View (E))); | |
| 2662 | ||
| 2663 | Set_Size_Known_At_Compile_Time (E, | |
| 2664 | Size_Known_At_Compile_Time (Full_View (E))); | |
| 2665 | ||
| 2666 | -- Size information is copied from the full view to the | |
| 2667 | -- incomplete or private view for consistency | |
| 2668 | ||
| 2669 | -- We skip this is the full view is not a type. This is | |
| 2670 | -- very strange of course, and can only happen as a result | |
| 2671 | -- of certain illegalities, such as a premature attempt to | |
| 2672 | -- derive from an incomplete type. | |
| 2673 | ||
| 2674 | if Is_Type (Full_View (E)) then | |
| 2675 | Set_Size_Info (E, Full_View (E)); | |
| 2676 | Set_RM_Size (E, RM_Size (Full_View (E))); | |
| 2677 | end if; | |
| 2678 | ||
| 2679 | return Result; | |
| 2680 | ||
| 2681 | -- Case of no full view present. If entity is derived or subtype, | |
| 2682 | -- it is safe to freeze, correctness depends on the frozen status | |
| 2683 | -- of parent. Otherwise it is either premature usage, or a Taft | |
| 2684 | -- amendment type, so diagnosis is at the point of use and the | |
| 2685 | -- type might be frozen later. | |
| 2686 | ||
| 2687 | elsif E /= Base_Type (E) | |
| 2688 | or else Is_Derived_Type (E) | |
| 2689 | then | |
| 2690 | null; | |
| 2691 | ||
| 2692 | else | |
| 2693 | Set_Is_Frozen (E, False); | |
| 2694 | return No_List; | |
| 2695 | end if; | |
| 2696 | ||
| 2697 | -- For access subprogram, freeze types of all formals, the return | |
| 2698 | -- type was already frozen, since it is the Etype of the function. | |
| 2699 | ||
| 2700 | elsif Ekind (E) = E_Subprogram_Type then | |
| 2701 | Formal := First_Formal (E); | |
| 2702 | while Present (Formal) loop | |
| 2703 | Freeze_And_Append (Etype (Formal), Loc, Result); | |
| 2704 | Next_Formal (Formal); | |
| 2705 | end loop; | |
| 2706 | ||
| 2707 | -- If the return type requires a transient scope, and we are on | |
| 2708 | -- a target allowing functions to return with a depressed stack | |
| 2709 | -- pointer, then we mark the function as requiring this treatment. | |
| 2710 | ||
| 2711 | if Functions_Return_By_DSP_On_Target | |
| 2712 | and then Requires_Transient_Scope (Etype (E)) | |
| 2713 | then | |
| 2714 | Set_Function_Returns_With_DSP (E); | |
| 2715 | end if; | |
| 2716 | ||
| 2717 | Freeze_Subprogram (E); | |
| 2718 | ||
| 2719 | -- For access to a protected subprogram, freeze the equivalent | |
| 2720 | -- type (however this is not set if we are not generating code) | |
| 2721 | -- or if this is an anonymous type used just for resolution). | |
| 2722 | ||
| 2723 | elsif Ekind (E) = E_Access_Protected_Subprogram_Type | |
| 2724 | and then Operating_Mode = Generate_Code | |
| 2725 | and then Present (Equivalent_Type (E)) | |
| 2726 | then | |
| 2727 | Freeze_And_Append (Equivalent_Type (E), Loc, Result); | |
| 2728 | end if; | |
| 2729 | ||
| 2730 | -- Generic types are never seen by the back-end, and are also not | |
| 2731 | -- processed by the expander (since the expander is turned off for | |
| 2732 | -- generic processing), so we never need freeze nodes for them. | |
| 2733 | ||
| 2734 | if Is_Generic_Type (E) then | |
| 2735 | return Result; | |
| 2736 | end if; | |
| 2737 | ||
| 2738 | -- Some special processing for non-generic types to complete | |
| 2739 | -- representation details not known till the freeze point. | |
| 2740 | ||
| 2741 | if Is_Fixed_Point_Type (E) then | |
| 2742 | Freeze_Fixed_Point_Type (E); | |
| 2743 | ||
| fbf5a39b AC |
2744 | -- Some error checks required for ordinary fixed-point type. |
| 2745 | -- Defer these till the freeze-point since we need the small | |
| 2746 | -- and range values. We only do these checks for base types | |
| 2747 | ||
| 2748 | if Is_Ordinary_Fixed_Point_Type (E) | |
| 2749 | and then E = Base_Type (E) | |
| 2750 | then | |
| 2751 | if Small_Value (E) < Ureal_2_M_80 then | |
| 2752 | Error_Msg_Name_1 := Name_Small; | |
| 2753 | Error_Msg_N | |
| 2754 | ("`&''%` is too small, minimum is 2.0'*'*(-80)", E); | |
| 2755 | ||
| 2756 | elsif Small_Value (E) > Ureal_2_80 then | |
| 2757 | Error_Msg_Name_1 := Name_Small; | |
| 2758 | Error_Msg_N | |
| 2759 | ("`&''%` is too large, maximum is 2.0'*'*80", E); | |
| 2760 | end if; | |
| 2761 | ||
| 2762 | if Expr_Value_R (Type_Low_Bound (E)) < Ureal_M_10_36 then | |
| 2763 | Error_Msg_Name_1 := Name_First; | |
| 2764 | Error_Msg_N | |
| 2765 | ("`&''%` is too small, minimum is -10.0'*'*36", E); | |
| 2766 | end if; | |
| 2767 | ||
| 2768 | if Expr_Value_R (Type_High_Bound (E)) > Ureal_10_36 then | |
| 2769 | Error_Msg_Name_1 := Name_Last; | |
| 2770 | Error_Msg_N | |
| 2771 | ("`&''%` is too large, maximum is 10.0'*'*36", E); | |
| 2772 | end if; | |
| 2773 | end if; | |
| 2774 | ||
| 70482933 RK |
2775 | elsif Is_Enumeration_Type (E) then |
| 2776 | Freeze_Enumeration_Type (E); | |
| 2777 | ||
| 2778 | elsif Is_Integer_Type (E) then | |
| 2779 | Adjust_Esize_For_Alignment (E); | |
| 2780 | ||
| 2781 | elsif Is_Access_Type (E) | |
| 2782 | and then No (Associated_Storage_Pool (E)) | |
| 2783 | then | |
| 2784 | Check_Restriction (No_Standard_Storage_Pools, E); | |
| 2785 | end if; | |
| 2786 | ||
| 2787 | -- If the current entity is an array or record subtype and has | |
| 2788 | -- discriminants used to constrain it, it must not freeze, because | |
| 2789 | -- Freeze_Entity nodes force Gigi to process the frozen type. | |
| 2790 | ||
| 2791 | if Is_Composite_Type (E) then | |
| 2792 | ||
| 2793 | if Is_Array_Type (E) then | |
| 70482933 RK |
2794 | declare |
| 2795 | Index : Node_Id := First_Index (E); | |
| 2796 | Expr1 : Node_Id; | |
| 2797 | Expr2 : Node_Id; | |
| 2798 | ||
| 2799 | begin | |
| 2800 | while Present (Index) loop | |
| 2801 | if Etype (Index) /= Any_Type then | |
| 2802 | Get_Index_Bounds (Index, Expr1, Expr2); | |
| 2803 | ||
| 2804 | for J in 1 .. 2 loop | |
| 2805 | if Nkind (Expr1) = N_Identifier | |
| 2806 | and then Ekind (Entity (Expr1)) = E_Discriminant | |
| 2807 | then | |
| 2808 | Set_Has_Delayed_Freeze (E, False); | |
| 2809 | Set_Freeze_Node (E, Empty); | |
| 2810 | Check_Debug_Info_Needed (E); | |
| 2811 | return Result; | |
| 2812 | end if; | |
| 2813 | ||
| 2814 | Expr1 := Expr2; | |
| 2815 | end loop; | |
| 2816 | end if; | |
| 2817 | ||
| 2818 | Next_Index (Index); | |
| 2819 | end loop; | |
| 2820 | end; | |
| 2821 | ||
| 2822 | elsif Has_Discriminants (E) | |
| 2823 | and Is_Constrained (E) | |
| 2824 | then | |
| 70482933 RK |
2825 | declare |
| 2826 | Constraint : Elmt_Id; | |
| 2827 | Expr : Node_Id; | |
| 07fc65c4 | 2828 | |
| 70482933 RK |
2829 | begin |
| 2830 | Constraint := First_Elmt (Discriminant_Constraint (E)); | |
| 70482933 | 2831 | while Present (Constraint) loop |
| 70482933 RK |
2832 | Expr := Node (Constraint); |
| 2833 | if Nkind (Expr) = N_Identifier | |
| 2834 | and then Ekind (Entity (Expr)) = E_Discriminant | |
| 2835 | then | |
| 2836 | Set_Has_Delayed_Freeze (E, False); | |
| 2837 | Set_Freeze_Node (E, Empty); | |
| 2838 | Check_Debug_Info_Needed (E); | |
| 2839 | return Result; | |
| 2840 | end if; | |
| 2841 | ||
| 2842 | Next_Elmt (Constraint); | |
| 2843 | end loop; | |
| 2844 | end; | |
| 70482933 RK |
2845 | end if; |
| 2846 | ||
| 2847 | -- AI-117 requires that all new primitives of a tagged type | |
| 2848 | -- must inherit the convention of the full view of the type. | |
| 2849 | -- Inherited and overriding operations are defined to inherit | |
| 2850 | -- the convention of their parent or overridden subprogram | |
| 2851 | -- (also specified in AI-117), and that will have occurred | |
| 2852 | -- earlier (in Derive_Subprogram and New_Overloaded_Entity). | |
| 2853 | -- Here we set the convention of primitives that are still | |
| 2854 | -- convention Ada, which will ensure that any new primitives | |
| 2855 | -- inherit the type's convention. Class-wide types can have | |
| 2856 | -- a foreign convention inherited from their specific type, | |
| 2857 | -- but are excluded from this since they don't have any | |
| 2858 | -- associated primitives. | |
| 2859 | ||
| 2860 | if Is_Tagged_Type (E) | |
| 2861 | and then not Is_Class_Wide_Type (E) | |
| 2862 | and then Convention (E) /= Convention_Ada | |
| 2863 | then | |
| 2864 | declare | |
| 2865 | Prim_List : constant Elist_Id := Primitive_Operations (E); | |
| 07fc65c4 | 2866 | Prim : Elmt_Id; |
| 70482933 | 2867 | begin |
| 07fc65c4 | 2868 | Prim := First_Elmt (Prim_List); |
| 70482933 RK |
2869 | while Present (Prim) loop |
| 2870 | if Convention (Node (Prim)) = Convention_Ada then | |
| 2871 | Set_Convention (Node (Prim), Convention (E)); | |
| 2872 | end if; | |
| 2873 | ||
| 2874 | Next_Elmt (Prim); | |
| 2875 | end loop; | |
| 2876 | end; | |
| 2877 | end if; | |
| 2878 | end if; | |
| 2879 | ||
| 07fc65c4 GB |
2880 | -- Generate primitive operation references for a tagged type |
| 2881 | ||
| 2882 | if Is_Tagged_Type (E) | |
| 2883 | and then not Is_Class_Wide_Type (E) | |
| 2884 | then | |
| 2885 | declare | |
| 2886 | Prim_List : constant Elist_Id := Primitive_Operations (E); | |
| 2887 | Prim : Elmt_Id; | |
| 2888 | Ent : Entity_Id; | |
| 2889 | ||
| 2890 | begin | |
| 2891 | Prim := First_Elmt (Prim_List); | |
| 2892 | while Present (Prim) loop | |
| 2893 | Ent := Node (Prim); | |
| 2894 | ||
| 2895 | -- If the operation is derived, get the original for | |
| 2896 | -- cross-reference purposes (it is the original for | |
| 2897 | -- which we want the xref, and for which the comes | |
| 2898 | -- from source test needs to be performed). | |
| 2899 | ||
| 2900 | while Present (Alias (Ent)) loop | |
| 2901 | Ent := Alias (Ent); | |
| 2902 | end loop; | |
| 2903 | ||
| 2904 | Generate_Reference (E, Ent, 'p', Set_Ref => False); | |
| 2905 | Next_Elmt (Prim); | |
| 2906 | end loop; | |
| 2907 | ||
| 2908 | -- If we get an exception, then something peculiar has happened | |
| 2909 | -- probably as a result of a previous error. Since this is only | |
| 2910 | -- for non-critical cross-references, ignore the error. | |
| 2911 | ||
| 2912 | exception | |
| 2913 | when others => null; | |
| 2914 | end; | |
| 2915 | end if; | |
| 2916 | ||
| 70482933 RK |
2917 | -- Now that all types from which E may depend are frozen, see |
| 2918 | -- if the size is known at compile time, if it must be unsigned, | |
| 2919 | -- or if strict alignent is required | |
| 2920 | ||
| 2921 | Check_Compile_Time_Size (E); | |
| 2922 | Check_Unsigned_Type (E); | |
| 2923 | ||
| 2924 | if Base_Type (E) = E then | |
| 2925 | Check_Strict_Alignment (E); | |
| 2926 | end if; | |
| 2927 | ||
| 2928 | -- Do not allow a size clause for a type which does not have a size | |
| 2929 | -- that is known at compile time | |
| 2930 | ||
| 2931 | if Has_Size_Clause (E) | |
| 2932 | and then not Size_Known_At_Compile_Time (E) | |
| 2933 | then | |
| 07fc65c4 GB |
2934 | -- Supress this message if errors posted on E, even if we are |
| 2935 | -- in all errors mode, since this is often a junk message | |
| 2936 | ||
| 2937 | if not Error_Posted (E) then | |
| 2938 | Error_Msg_N | |
| 2939 | ("size clause not allowed for variable length type", | |
| 2940 | Size_Clause (E)); | |
| 2941 | end if; | |
| 70482933 RK |
2942 | end if; |
| 2943 | ||
| 2944 | -- Remaining process is to set/verify the representation information, | |
| 2945 | -- in particular the size and alignment values. This processing is | |
| 2946 | -- not required for generic types, since generic types do not play | |
| 2947 | -- any part in code generation, and so the size and alignment values | |
| 2948 | -- for suhc types are irrelevant. | |
| 2949 | ||
| 2950 | if Is_Generic_Type (E) then | |
| 2951 | return Result; | |
| 2952 | ||
| 2953 | -- Otherwise we call the layout procedure | |
| 2954 | ||
| 2955 | else | |
| 2956 | Layout_Type (E); | |
| 2957 | end if; | |
| 2958 | ||
| 2959 | -- End of freeze processing for type entities | |
| 2960 | end if; | |
| 2961 | ||
| 2962 | -- Here is where we logically freeze the current entity. If it has a | |
| 2963 | -- freeze node, then this is the point at which the freeze node is | |
| 2964 | -- linked into the result list. | |
| 2965 | ||
| 2966 | if Has_Delayed_Freeze (E) then | |
| 2967 | ||
| 2968 | -- If a freeze node is already allocated, use it, otherwise allocate | |
| 2969 | -- a new one. The preallocation happens in the case of anonymous base | |
| 2970 | -- types, where we preallocate so that we can set First_Subtype_Link. | |
| 2971 | -- Note that we reset the Sloc to the current freeze location. | |
| 2972 | ||
| 2973 | if Present (Freeze_Node (E)) then | |
| 2974 | F_Node := Freeze_Node (E); | |
| 2975 | Set_Sloc (F_Node, Loc); | |
| 2976 | ||
| 2977 | else | |
| 2978 | F_Node := New_Node (N_Freeze_Entity, Loc); | |
| 2979 | Set_Freeze_Node (E, F_Node); | |
| 2980 | Set_Access_Types_To_Process (F_Node, No_Elist); | |
| 2981 | Set_TSS_Elist (F_Node, No_Elist); | |
| 2982 | Set_Actions (F_Node, No_List); | |
| 2983 | end if; | |
| 2984 | ||
| 2985 | Set_Entity (F_Node, E); | |
| 2986 | ||
| 2987 | if Result = No_List then | |
| 2988 | Result := New_List (F_Node); | |
| 2989 | else | |
| 2990 | Append (F_Node, Result); | |
| 2991 | end if; | |
| 70482933 RK |
2992 | end if; |
| 2993 | ||
| 2994 | -- When a type is frozen, the first subtype of the type is frozen as | |
| 2995 | -- well (RM 13.14(15)). This has to be done after freezing the type, | |
| 2996 | -- since obviously the first subtype depends on its own base type. | |
| 2997 | ||
| 2998 | if Is_Type (E) then | |
| 2999 | Freeze_And_Append (First_Subtype (E), Loc, Result); | |
| 3000 | ||
| 3001 | -- If we just froze a tagged non-class wide record, then freeze the | |
| 3002 | -- corresponding class-wide type. This must be done after the tagged | |
| 3003 | -- type itself is frozen, because the class-wide type refers to the | |
| 3004 | -- tagged type which generates the class. | |
| 3005 | ||
| 3006 | if Is_Tagged_Type (E) | |
| 3007 | and then not Is_Class_Wide_Type (E) | |
| 3008 | and then Present (Class_Wide_Type (E)) | |
| 3009 | then | |
| 3010 | Freeze_And_Append (Class_Wide_Type (E), Loc, Result); | |
| 3011 | end if; | |
| 3012 | end if; | |
| 3013 | ||
| 3014 | Check_Debug_Info_Needed (E); | |
| 3015 | ||
| 3016 | -- Special handling for subprograms | |
| 3017 | ||
| 3018 | if Is_Subprogram (E) then | |
| 3019 | ||
| 3020 | -- If subprogram has address clause then reset Is_Public flag, since | |
| 3021 | -- we do not want the backend to generate external references. | |
| 3022 | ||
| 3023 | if Present (Address_Clause (E)) | |
| 3024 | and then not Is_Library_Level_Entity (E) | |
| 3025 | then | |
| 3026 | Set_Is_Public (E, False); | |
| 3027 | ||
| 3028 | -- If no address clause and not intrinsic, then for imported | |
| 3029 | -- subprogram in main unit, generate descriptor if we are in | |
| 3030 | -- Propagate_Exceptions mode. | |
| 3031 | ||
| 3032 | elsif Propagate_Exceptions | |
| 3033 | and then Is_Imported (E) | |
| 3034 | and then not Is_Intrinsic_Subprogram (E) | |
| 3035 | and then Convention (E) /= Convention_Stubbed | |
| 3036 | then | |
| 3037 | if Result = No_List then | |
| 3038 | Result := Empty_List; | |
| 3039 | end if; | |
| 3040 | ||
| 3041 | Generate_Subprogram_Descriptor_For_Imported_Subprogram | |
| 3042 | (E, Result); | |
| 3043 | end if; | |
| 70482933 RK |
3044 | end if; |
| 3045 | ||
| 3046 | return Result; | |
| 3047 | end Freeze_Entity; | |
| 3048 | ||
| 3049 | ----------------------------- | |
| 3050 | -- Freeze_Enumeration_Type -- | |
| 3051 | ----------------------------- | |
| 3052 | ||
| 3053 | procedure Freeze_Enumeration_Type (Typ : Entity_Id) is | |
| 3054 | begin | |
| 3055 | if Has_Foreign_Convention (Typ) | |
| 3056 | and then not Has_Size_Clause (Typ) | |
| 3057 | and then Esize (Typ) < Standard_Integer_Size | |
| 3058 | then | |
| 3059 | Init_Esize (Typ, Standard_Integer_Size); | |
| 70482933 RK |
3060 | else |
| 3061 | Adjust_Esize_For_Alignment (Typ); | |
| 3062 | end if; | |
| 3063 | end Freeze_Enumeration_Type; | |
| 3064 | ||
| 3065 | ----------------------- | |
| 3066 | -- Freeze_Expression -- | |
| 3067 | ----------------------- | |
| 3068 | ||
| 3069 | procedure Freeze_Expression (N : Node_Id) is | |
| 3070 | In_Def_Exp : constant Boolean := In_Default_Expression; | |
| 3071 | Typ : Entity_Id; | |
| 3072 | Nam : Entity_Id; | |
| 3073 | Desig_Typ : Entity_Id; | |
| 3074 | P : Node_Id; | |
| 3075 | Parent_P : Node_Id; | |
| 3076 | ||
| 3077 | Freeze_Outside : Boolean := False; | |
| 3078 | -- This flag is set true if the entity must be frozen outside the | |
| 3079 | -- current subprogram. This happens in the case of expander generated | |
| 3080 | -- subprograms (_Init_Proc, _Input, _Output, _Read, _Write) which do | |
| 3081 | -- not freeze all entities like other bodies, but which nevertheless | |
| 3082 | -- may reference entities that have to be frozen before the body and | |
| 3083 | -- obviously cannot be frozen inside the body. | |
| 3084 | ||
| 3085 | function In_Exp_Body (N : Node_Id) return Boolean; | |
| 3086 | -- Given an N_Handled_Sequence_Of_Statements node N, determines whether | |
| 3087 | -- it is the handled statement sequence of an expander generated | |
| 3088 | -- subprogram (init proc, or stream subprogram). If so, it returns | |
| 3089 | -- True, otherwise False. | |
| 3090 | ||
| fbf5a39b AC |
3091 | ----------------- |
| 3092 | -- In_Exp_Body -- | |
| 3093 | ----------------- | |
| 3094 | ||
| 70482933 RK |
3095 | function In_Exp_Body (N : Node_Id) return Boolean is |
| 3096 | P : Node_Id; | |
| 3097 | ||
| 3098 | begin | |
| 3099 | if Nkind (N) = N_Subprogram_Body then | |
| 3100 | P := N; | |
| 3101 | else | |
| 3102 | P := Parent (N); | |
| 3103 | end if; | |
| 3104 | ||
| 3105 | if Nkind (P) /= N_Subprogram_Body then | |
| 3106 | return False; | |
| 3107 | ||
| 3108 | else | |
| 3109 | P := Defining_Unit_Name (Specification (P)); | |
| 3110 | ||
| 3111 | if Nkind (P) = N_Defining_Identifier | |
| fbf5a39b AC |
3112 | and then (Is_Init_Proc (P) or else |
| 3113 | Is_TSS (P, TSS_Stream_Input) or else | |
| 3114 | Is_TSS (P, TSS_Stream_Output) or else | |
| 3115 | Is_TSS (P, TSS_Stream_Read) or else | |
| 3116 | Is_TSS (P, TSS_Stream_Write)) | |
| 70482933 RK |
3117 | then |
| 3118 | return True; | |
| 3119 | else | |
| 3120 | return False; | |
| 3121 | end if; | |
| 3122 | end if; | |
| 70482933 RK |
3123 | end In_Exp_Body; |
| 3124 | ||
| 3125 | -- Start of processing for Freeze_Expression | |
| 3126 | ||
| 3127 | begin | |
| 3128 | -- Immediate return if freezing is inhibited. This flag is set by | |
| 3129 | -- the analyzer to stop freezing on generated expressions that would | |
| 3130 | -- cause freezing if they were in the source program, but which are | |
| 3131 | -- not supposed to freeze, since they are created. | |
| 3132 | ||
| 3133 | if Must_Not_Freeze (N) then | |
| 3134 | return; | |
| 3135 | end if; | |
| 3136 | ||
| 3137 | -- If expression is non-static, then it does not freeze in a default | |
| 3138 | -- expression, see section "Handling of Default Expressions" in the | |
| 3139 | -- spec of package Sem for further details. Note that we have to | |
| 3140 | -- make sure that we actually have a real expression (if we have | |
| 3141 | -- a subtype indication, we can't test Is_Static_Expression!) | |
| 3142 | ||
| 3143 | if In_Def_Exp | |
| 3144 | and then Nkind (N) in N_Subexpr | |
| 3145 | and then not Is_Static_Expression (N) | |
| 3146 | then | |
| 3147 | return; | |
| 3148 | end if; | |
| 3149 | ||
| 3150 | -- Freeze type of expression if not frozen already | |
| 3151 | ||
| fbf5a39b AC |
3152 | Typ := Empty; |
| 3153 | ||
| 3154 | if Nkind (N) in N_Has_Etype then | |
| 3155 | if not Is_Frozen (Etype (N)) then | |
| 3156 | Typ := Etype (N); | |
| 3157 | ||
| 3158 | -- Base type may be an derived numeric type that is frozen at | |
| 3159 | -- the point of declaration, but first_subtype is still unfrozen. | |
| 3160 | ||
| 3161 | elsif not Is_Frozen (First_Subtype (Etype (N))) then | |
| 3162 | Typ := First_Subtype (Etype (N)); | |
| 3163 | end if; | |
| 70482933 RK |
3164 | end if; |
| 3165 | ||
| 3166 | -- For entity name, freeze entity if not frozen already. A special | |
| 3167 | -- exception occurs for an identifier that did not come from source. | |
| 3168 | -- We don't let such identifiers freeze a non-internal entity, i.e. | |
| 3169 | -- an entity that did come from source, since such an identifier was | |
| 3170 | -- generated by the expander, and cannot have any semantic effect on | |
| 3171 | -- the freezing semantics. For example, this stops the parameter of | |
| 3172 | -- an initialization procedure from freezing the variable. | |
| 3173 | ||
| 3174 | if Is_Entity_Name (N) | |
| 3175 | and then not Is_Frozen (Entity (N)) | |
| 3176 | and then (Nkind (N) /= N_Identifier | |
| 3177 | or else Comes_From_Source (N) | |
| 3178 | or else not Comes_From_Source (Entity (N))) | |
| 3179 | then | |
| 3180 | Nam := Entity (N); | |
| 70482933 RK |
3181 | else |
| 3182 | Nam := Empty; | |
| 3183 | end if; | |
| 3184 | ||
| 3185 | -- For an allocator freeze designated type if not frozen already. | |
| 3186 | ||
| 3187 | -- For an aggregate whose component type is an access type, freeze | |
| 3188 | -- the designated type now, so that its freeze does not appear within | |
| 3189 | -- the loop that might be created in the expansion of the aggregate. | |
| 3190 | -- If the designated type is a private type without full view, the | |
| 3191 | -- expression cannot contain an allocator, so the type is not frozen. | |
| 3192 | ||
| 3193 | Desig_Typ := Empty; | |
| 70482933 | 3194 | |
| fbf5a39b | 3195 | case Nkind (N) is |
| 70482933 RK |
3196 | when N_Allocator => |
| 3197 | Desig_Typ := Designated_Type (Etype (N)); | |
| 3198 | ||
| 3199 | when N_Aggregate => | |
| 3200 | if Is_Array_Type (Etype (N)) | |
| 3201 | and then Is_Access_Type (Component_Type (Etype (N))) | |
| 3202 | then | |
| 3203 | Desig_Typ := Designated_Type (Component_Type (Etype (N))); | |
| 3204 | end if; | |
| 3205 | ||
| 3206 | when N_Selected_Component | | |
| 3207 | N_Indexed_Component | | |
| 3208 | N_Slice => | |
| 3209 | ||
| 3210 | if Is_Access_Type (Etype (Prefix (N))) then | |
| 3211 | Desig_Typ := Designated_Type (Etype (Prefix (N))); | |
| 3212 | end if; | |
| 3213 | ||
| 3214 | when others => | |
| 3215 | null; | |
| 70482933 RK |
3216 | end case; |
| 3217 | ||
| 3218 | if Desig_Typ /= Empty | |
| 3219 | and then (Is_Frozen (Desig_Typ) | |
| 3220 | or else (not Is_Fully_Defined (Desig_Typ))) | |
| 3221 | then | |
| 3222 | Desig_Typ := Empty; | |
| 3223 | end if; | |
| 3224 | ||
| 3225 | -- All done if nothing needs freezing | |
| 3226 | ||
| 3227 | if No (Typ) | |
| 3228 | and then No (Nam) | |
| 3229 | and then No (Desig_Typ) | |
| 3230 | then | |
| 3231 | return; | |
| 3232 | end if; | |
| 3233 | ||
| 3234 | -- Loop for looking at the right place to insert the freeze nodes | |
| 3235 | -- exiting from the loop when it is appropriate to insert the freeze | |
| 3236 | -- node before the current node P. | |
| 3237 | ||
| 3238 | -- Also checks some special exceptions to the freezing rules. These | |
| 3239 | -- cases result in a direct return, bypassing the freeze action. | |
| 3240 | ||
| 3241 | P := N; | |
| 3242 | loop | |
| 3243 | Parent_P := Parent (P); | |
| 3244 | ||
| 3245 | -- If we don't have a parent, then we are not in a well-formed | |
| 3246 | -- tree. This is an unusual case, but there are some legitimate | |
| 3247 | -- situations in which this occurs, notably when the expressions | |
| 3248 | -- in the range of a type declaration are resolved. We simply | |
| 3249 | -- ignore the freeze request in this case. Is this right ??? | |
| 3250 | ||
| 3251 | if No (Parent_P) then | |
| 3252 | return; | |
| 3253 | end if; | |
| 3254 | ||
| 3255 | -- See if we have got to an appropriate point in the tree | |
| 3256 | ||
| 3257 | case Nkind (Parent_P) is | |
| 3258 | ||
| 3259 | -- A special test for the exception of (RM 13.14(8)) for the | |
| 3260 | -- case of per-object expressions (RM 3.8(18)) occurring in a | |
| 3261 | -- component definition or a discrete subtype definition. Note | |
| 3262 | -- that we test for a component declaration which includes both | |
| 3263 | -- cases we are interested in, and furthermore the tree does not | |
| 3264 | -- have explicit nodes for either of these two constructs. | |
| 3265 | ||
| 3266 | when N_Component_Declaration => | |
| 3267 | ||
| 3268 | -- The case we want to test for here is an identifier that is | |
| 3269 | -- a per-object expression, this is either a discriminant that | |
| 3270 | -- appears in a context other than the component declaration | |
| 3271 | -- or it is a reference to the type of the enclosing construct. | |
| 3272 | ||
| 3273 | -- For either of these cases, we skip the freezing | |
| 3274 | ||
| 3275 | if not In_Default_Expression | |
| 3276 | and then Nkind (N) = N_Identifier | |
| 3277 | and then (Present (Entity (N))) | |
| 3278 | then | |
| 3279 | -- We recognize the discriminant case by just looking for | |
| 3280 | -- a reference to a discriminant. It can only be one for | |
| 3281 | -- the enclosing construct. Skip freezing in this case. | |
| 3282 | ||
| 3283 | if Ekind (Entity (N)) = E_Discriminant then | |
| 3284 | return; | |
| 3285 | ||
| 3286 | -- For the case of a reference to the enclosing record, | |
| 3287 | -- (or task or protected type), we look for a type that | |
| 3288 | -- matches the current scope. | |
| 3289 | ||
| 3290 | elsif Entity (N) = Current_Scope then | |
| 3291 | return; | |
| 3292 | end if; | |
| 3293 | end if; | |
| 3294 | ||
| 3295 | -- If we have an enumeration literal that appears as the | |
| 3296 | -- choice in the aggregate of an enumeration representation | |
| fbf5a39b | 3297 | -- clause, then freezing does not occur (RM 13.14(10)). |
| 70482933 RK |
3298 | |
| 3299 | when N_Enumeration_Representation_Clause => | |
| 3300 | ||
| 3301 | -- The case we are looking for is an enumeration literal | |
| 3302 | ||
| 3303 | if (Nkind (N) = N_Identifier or Nkind (N) = N_Character_Literal) | |
| 3304 | and then Is_Enumeration_Type (Etype (N)) | |
| 3305 | then | |
| 3306 | -- If enumeration literal appears directly as the choice, | |
| 3307 | -- do not freeze (this is the normal non-overloade case) | |
| 3308 | ||
| 3309 | if Nkind (Parent (N)) = N_Component_Association | |
| 3310 | and then First (Choices (Parent (N))) = N | |
| 3311 | then | |
| 3312 | return; | |
| 3313 | ||
| 3314 | -- If enumeration literal appears as the name of a | |
| 3315 | -- function which is the choice, then also do not freeze. | |
| 3316 | -- This happens in the overloaded literal case, where the | |
| 3317 | -- enumeration literal is temporarily changed to a function | |
| 3318 | -- call for overloading analysis purposes. | |
| 3319 | ||
| 3320 | elsif Nkind (Parent (N)) = N_Function_Call | |
| 3321 | and then | |
| 3322 | Nkind (Parent (Parent (N))) = N_Component_Association | |
| 3323 | and then | |
| 3324 | First (Choices (Parent (Parent (N)))) = Parent (N) | |
| 3325 | then | |
| 3326 | return; | |
| 3327 | end if; | |
| 3328 | end if; | |
| 3329 | ||
| 3330 | -- Normally if the parent is a handled sequence of statements, | |
| 3331 | -- then the current node must be a statement, and that is an | |
| 3332 | -- appropriate place to insert a freeze node. | |
| 3333 | ||
| 3334 | when N_Handled_Sequence_Of_Statements => | |
| 3335 | ||
| 3336 | -- An exception occurs when the sequence of statements is | |
| 3337 | -- for an expander generated body that did not do the usual | |
| 3338 | -- freeze all operation. In this case we usually want to | |
| 3339 | -- freeze outside this body, not inside it, and we skip | |
| 3340 | -- past the subprogram body that we are inside. | |
| 3341 | ||
| 3342 | if In_Exp_Body (Parent_P) then | |
| 3343 | ||
| 3344 | -- However, we *do* want to freeze at this point if we have | |
| 3345 | -- an entity to freeze, and that entity is declared *inside* | |
| 3346 | -- the body of the expander generated procedure. This case | |
| 3347 | -- is recognized by the scope of the type, which is either | |
| 3348 | -- the spec for some enclosing body, or (in the case of | |
| 3349 | -- init_procs, for which there are no separate specs) the | |
| 3350 | -- current scope. | |
| 3351 | ||
| 3352 | declare | |
| 3353 | Subp : constant Node_Id := Parent (Parent_P); | |
| 3354 | Cspc : Entity_Id; | |
| 3355 | ||
| 3356 | begin | |
| 3357 | if Nkind (Subp) = N_Subprogram_Body then | |
| 3358 | Cspc := Corresponding_Spec (Subp); | |
| 3359 | ||
| 3360 | if (Present (Typ) and then Scope (Typ) = Cspc) | |
| 3361 | or else | |
| 3362 | (Present (Nam) and then Scope (Nam) = Cspc) | |
| 3363 | then | |
| 3364 | exit; | |
| 3365 | ||
| 3366 | elsif Present (Typ) | |
| 3367 | and then Scope (Typ) = Current_Scope | |
| 3368 | and then Current_Scope = Defining_Entity (Subp) | |
| 3369 | then | |
| 3370 | exit; | |
| 3371 | end if; | |
| 3372 | end if; | |
| 3373 | end; | |
| 3374 | ||
| 3375 | -- If not that exception to the exception, then this is | |
| 3376 | -- where we delay the freeze till outside the body. | |
| 3377 | ||
| 3378 | Parent_P := Parent (Parent_P); | |
| 3379 | Freeze_Outside := True; | |
| 3380 | ||
| 3381 | -- Here if normal case where we are in handled statement | |
| 3382 | -- sequence and want to do the insertion right there. | |
| 3383 | ||
| 3384 | else | |
| 3385 | exit; | |
| 3386 | end if; | |
| 3387 | ||
| 3388 | -- If parent is a body or a spec or a block, then the current | |
| 3389 | -- node is a statement or declaration and we can insert the | |
| 3390 | -- freeze node before it. | |
| 3391 | ||
| 3392 | when N_Package_Specification | | |
| 3393 | N_Package_Body | | |
| 3394 | N_Subprogram_Body | | |
| 3395 | N_Task_Body | | |
| 3396 | N_Protected_Body | | |
| 3397 | N_Entry_Body | | |
| 3398 | N_Block_Statement => exit; | |
| 3399 | ||
| 3400 | -- The expander is allowed to define types in any statements list, | |
| 3401 | -- so any of the following parent nodes also mark a freezing point | |
| 3402 | -- if the actual node is in a list of statements or declarations. | |
| 3403 | ||
| 3404 | when N_Exception_Handler | | |
| 3405 | N_If_Statement | | |
| 3406 | N_Elsif_Part | | |
| 3407 | N_Case_Statement_Alternative | | |
| 3408 | N_Compilation_Unit_Aux | | |
| 3409 | N_Selective_Accept | | |
| 3410 | N_Accept_Alternative | | |
| 3411 | N_Delay_Alternative | | |
| 3412 | N_Conditional_Entry_Call | | |
| 3413 | N_Entry_Call_Alternative | | |
| 3414 | N_Triggering_Alternative | | |
| 3415 | N_Abortable_Part | | |
| 3416 | N_Freeze_Entity => | |
| 3417 | ||
| 3418 | exit when Is_List_Member (P); | |
| 3419 | ||
| 3420 | -- Note: The N_Loop_Statement is a special case. A type that | |
| 3421 | -- appears in the source can never be frozen in a loop (this | |
| 3422 | -- occurs only because of a loop expanded by the expander), | |
| 3423 | -- so we keep on going. Otherwise we terminate the search. | |
| 3424 | -- Same is true of any entity which comes from source. (if they | |
| 3425 | -- have a predefined type, that type does not appear to come | |
| 3426 | -- from source, but the entity should not be frozen here). | |
| 3427 | ||
| 3428 | when N_Loop_Statement => | |
| 3429 | exit when not Comes_From_Source (Etype (N)) | |
| 3430 | and then (No (Nam) or else not Comes_From_Source (Nam)); | |
| 3431 | ||
| 3432 | -- For all other cases, keep looking at parents | |
| 3433 | ||
| 3434 | when others => | |
| 3435 | null; | |
| 3436 | end case; | |
| 3437 | ||
| 3438 | -- We fall through the case if we did not yet find the proper | |
| 3439 | -- place in the free for inserting the freeze node, so climb! | |
| 3440 | ||
| 3441 | P := Parent_P; | |
| 3442 | end loop; | |
| 3443 | ||
| 3444 | -- If the expression appears in a record or an initialization | |
| 3445 | -- procedure, the freeze nodes are collected and attached to | |
| 3446 | -- the current scope, to be inserted and analyzed on exit from | |
| 3447 | -- the scope, to insure that generated entities appear in the | |
| 3448 | -- correct scope. If the expression is a default for a discriminant | |
| 3449 | -- specification, the scope is still void. The expression can also | |
| 3450 | -- appear in the discriminant part of a private or concurrent type. | |
| 3451 | ||
| 3452 | -- The other case requiring this special handling is if we are in | |
| 3453 | -- a default expression, since in that case we are about to freeze | |
| 3454 | -- a static type, and the freeze scope needs to be the outer scope, | |
| 3455 | -- not the scope of the subprogram with the default parameter. | |
| 3456 | ||
| 3457 | -- For default expressions in generic units, the Move_Freeze_Nodes | |
| 3458 | -- mechanism (see sem_ch12.adb) takes care of placing them at the | |
| 3459 | -- proper place, after the generic unit. | |
| 3460 | ||
| 3461 | if (In_Def_Exp and not Inside_A_Generic) | |
| 3462 | or else Freeze_Outside | |
| 3463 | or else (Is_Type (Current_Scope) | |
| 3464 | and then (not Is_Concurrent_Type (Current_Scope) | |
| 3465 | or else not Has_Completion (Current_Scope))) | |
| 3466 | or else Ekind (Current_Scope) = E_Void | |
| 3467 | then | |
| 3468 | declare | |
| 3469 | Loc : constant Source_Ptr := Sloc (Current_Scope); | |
| 3470 | Freeze_Nodes : List_Id := No_List; | |
| 3471 | ||
| 3472 | begin | |
| 3473 | if Present (Desig_Typ) then | |
| 3474 | Freeze_And_Append (Desig_Typ, Loc, Freeze_Nodes); | |
| 3475 | end if; | |
| 3476 | ||
| 3477 | if Present (Typ) then | |
| 3478 | Freeze_And_Append (Typ, Loc, Freeze_Nodes); | |
| 3479 | end if; | |
| 3480 | ||
| 3481 | if Present (Nam) then | |
| 3482 | Freeze_And_Append (Nam, Loc, Freeze_Nodes); | |
| 3483 | end if; | |
| 3484 | ||
| 3485 | if Is_Non_Empty_List (Freeze_Nodes) then | |
| 70482933 RK |
3486 | if No (Scope_Stack.Table |
| 3487 | (Scope_Stack.Last).Pending_Freeze_Actions) | |
| 3488 | then | |
| 3489 | Scope_Stack.Table | |
| 3490 | (Scope_Stack.Last).Pending_Freeze_Actions := | |
| 3491 | Freeze_Nodes; | |
| 3492 | else | |
| 3493 | Append_List (Freeze_Nodes, Scope_Stack.Table | |
| 3494 | (Scope_Stack.Last).Pending_Freeze_Actions); | |
| 3495 | end if; | |
| 3496 | end if; | |
| 3497 | end; | |
| 3498 | ||
| 3499 | return; | |
| 3500 | end if; | |
| 3501 | ||
| 3502 | -- Now we have the right place to do the freezing. First, a special | |
| 3503 | -- adjustment, if we are in default expression analysis mode, these | |
| 3504 | -- freeze actions must not be thrown away (normally all inserted | |
| 3505 | -- actions are thrown away in this mode. However, the freeze actions | |
| 3506 | -- are from static expressions and one of the important reasons we | |
| 3507 | -- are doing this special analysis is to get these freeze actions. | |
| 3508 | -- Therefore we turn off the In_Default_Expression mode to propagate | |
| 3509 | -- these freeze actions. This also means they get properly analyzed | |
| 3510 | -- and expanded. | |
| 3511 | ||
| 3512 | In_Default_Expression := False; | |
| 3513 | ||
| fbf5a39b | 3514 | -- Freeze the designated type of an allocator (RM 13.14(13)) |
| 70482933 RK |
3515 | |
| 3516 | if Present (Desig_Typ) then | |
| 3517 | Freeze_Before (P, Desig_Typ); | |
| 3518 | end if; | |
| 3519 | ||
| fbf5a39b | 3520 | -- Freeze type of expression (RM 13.14(10)). Note that we took care of |
| 70482933 RK |
3521 | -- the enumeration representation clause exception in the loop above. |
| 3522 | ||
| 3523 | if Present (Typ) then | |
| 3524 | Freeze_Before (P, Typ); | |
| 3525 | end if; | |
| 3526 | ||
| fbf5a39b | 3527 | -- Freeze name if one is present (RM 13.14(11)) |
| 70482933 RK |
3528 | |
| 3529 | if Present (Nam) then | |
| 3530 | Freeze_Before (P, Nam); | |
| 3531 | end if; | |
| 3532 | ||
| 3533 | In_Default_Expression := In_Def_Exp; | |
| 3534 | end Freeze_Expression; | |
| 3535 | ||
| 3536 | ----------------------------- | |
| 3537 | -- Freeze_Fixed_Point_Type -- | |
| 3538 | ----------------------------- | |
| 3539 | ||
| 3540 | -- Certain fixed-point types and subtypes, including implicit base | |
| 3541 | -- types and declared first subtypes, have not yet set up a range. | |
| 3542 | -- This is because the range cannot be set until the Small and Size | |
| 3543 | -- values are known, and these are not known till the type is frozen. | |
| 3544 | ||
| 3545 | -- To signal this case, Scalar_Range contains an unanalyzed syntactic | |
| 3546 | -- range whose bounds are unanalyzed real literals. This routine will | |
| 3547 | -- recognize this case, and transform this range node into a properly | |
| 3548 | -- typed range with properly analyzed and resolved values. | |
| 3549 | ||
| 3550 | procedure Freeze_Fixed_Point_Type (Typ : Entity_Id) is | |
| 3551 | Rng : constant Node_Id := Scalar_Range (Typ); | |
| 3552 | Lo : constant Node_Id := Low_Bound (Rng); | |
| 3553 | Hi : constant Node_Id := High_Bound (Rng); | |
| 3554 | Btyp : constant Entity_Id := Base_Type (Typ); | |
| 3555 | Brng : constant Node_Id := Scalar_Range (Btyp); | |
| 3556 | BLo : constant Node_Id := Low_Bound (Brng); | |
| 3557 | BHi : constant Node_Id := High_Bound (Brng); | |
| 3558 | Small : constant Ureal := Small_Value (Typ); | |
| 3559 | Loval : Ureal; | |
| 3560 | Hival : Ureal; | |
| 3561 | Atype : Entity_Id; | |
| 3562 | ||
| 3563 | Actual_Size : Nat; | |
| 3564 | ||
| 3565 | function Fsize (Lov, Hiv : Ureal) return Nat; | |
| 3566 | -- Returns size of type with given bounds. Also leaves these | |
| 3567 | -- bounds set as the current bounds of the Typ. | |
| 3568 | ||
| 3569 | function Fsize (Lov, Hiv : Ureal) return Nat is | |
| 3570 | begin | |
| 3571 | Set_Realval (Lo, Lov); | |
| 3572 | Set_Realval (Hi, Hiv); | |
| 3573 | return Minimum_Size (Typ); | |
| 3574 | end Fsize; | |
| 3575 | ||
| 3576 | -- Start of processing for Freeze_Fixed_Point_Type; | |
| 3577 | ||
| 3578 | begin | |
| 3579 | -- If Esize of a subtype has not previously been set, set it now | |
| 3580 | ||
| 3581 | if Unknown_Esize (Typ) then | |
| 3582 | Atype := Ancestor_Subtype (Typ); | |
| 3583 | ||
| 3584 | if Present (Atype) then | |
| fbf5a39b | 3585 | Set_Esize (Typ, Esize (Atype)); |
| 70482933 | 3586 | else |
| fbf5a39b | 3587 | Set_Esize (Typ, Esize (Base_Type (Typ))); |
| 70482933 RK |
3588 | end if; |
| 3589 | end if; | |
| 3590 | ||
| 3591 | -- Immediate return if the range is already analyzed. This means | |
| 3592 | -- that the range is already set, and does not need to be computed | |
| 3593 | -- by this routine. | |
| 3594 | ||
| 3595 | if Analyzed (Rng) then | |
| 3596 | return; | |
| 3597 | end if; | |
| 3598 | ||
| 3599 | -- Immediate return if either of the bounds raises Constraint_Error | |
| 3600 | ||
| 3601 | if Raises_Constraint_Error (Lo) | |
| 3602 | or else Raises_Constraint_Error (Hi) | |
| 3603 | then | |
| 3604 | return; | |
| 3605 | end if; | |
| 3606 | ||
| 3607 | Loval := Realval (Lo); | |
| 3608 | Hival := Realval (Hi); | |
| 3609 | ||
| 3610 | -- Ordinary fixed-point case | |
| 3611 | ||
| 3612 | if Is_Ordinary_Fixed_Point_Type (Typ) then | |
| 3613 | ||
| 3614 | -- For the ordinary fixed-point case, we are allowed to fudge the | |
| 3615 | -- end-points up or down by small. Generally we prefer to fudge | |
| 3616 | -- up, i.e. widen the bounds for non-model numbers so that the | |
| 3617 | -- end points are included. However there are cases in which this | |
| 3618 | -- cannot be done, and indeed cases in which we may need to narrow | |
| 3619 | -- the bounds. The following circuit makes the decision. | |
| 3620 | ||
| 3621 | -- Note: our terminology here is that Incl_EP means that the | |
| 3622 | -- bounds are widened by Small if necessary to include the end | |
| 3623 | -- points, and Excl_EP means that the bounds are narrowed by | |
| 3624 | -- Small to exclude the end-points if this reduces the size. | |
| 3625 | ||
| 3626 | -- Note that in the Incl case, all we care about is including the | |
| 3627 | -- end-points. In the Excl case, we want to narrow the bounds as | |
| 3628 | -- much as permitted by the RM, to give the smallest possible size. | |
| 3629 | ||
| 3630 | Fudge : declare | |
| 3631 | Loval_Incl_EP : Ureal; | |
| 3632 | Hival_Incl_EP : Ureal; | |
| 3633 | ||
| 3634 | Loval_Excl_EP : Ureal; | |
| 3635 | Hival_Excl_EP : Ureal; | |
| 3636 | ||
| 3637 | Size_Incl_EP : Nat; | |
| 3638 | Size_Excl_EP : Nat; | |
| 3639 | ||
| 3640 | Model_Num : Ureal; | |
| 3641 | First_Subt : Entity_Id; | |
| 3642 | Actual_Lo : Ureal; | |
| 3643 | Actual_Hi : Ureal; | |
| 3644 | ||
| 3645 | begin | |
| 3646 | -- First step. Base types are required to be symmetrical. Right | |
| 3647 | -- now, the base type range is a copy of the first subtype range. | |
| 3648 | -- This will be corrected before we are done, but right away we | |
| 3649 | -- need to deal with the case where both bounds are non-negative. | |
| 3650 | -- In this case, we set the low bound to the negative of the high | |
| 3651 | -- bound, to make sure that the size is computed to include the | |
| 3652 | -- required sign. Note that we do not need to worry about the | |
| 3653 | -- case of both bounds negative, because the sign will be dealt | |
| 3654 | -- with anyway. Furthermore we can't just go making such a bound | |
| 3655 | -- symmetrical, since in a twos-complement system, there is an | |
| 3656 | -- extra negative value which could not be accomodated on the | |
| 3657 | -- positive side. | |
| 3658 | ||
| 3659 | if Typ = Btyp | |
| 3660 | and then not UR_Is_Negative (Loval) | |
| 3661 | and then Hival > Loval | |
| 3662 | then | |
| 3663 | Loval := -Hival; | |
| 3664 | Set_Realval (Lo, Loval); | |
| 3665 | end if; | |
| 3666 | ||
| 3667 | -- Compute the fudged bounds. If the number is a model number, | |
| 3668 | -- then we do nothing to include it, but we are allowed to | |
| 3669 | -- backoff to the next adjacent model number when we exclude | |
| 3670 | -- it. If it is not a model number then we straddle the two | |
| 3671 | -- values with the model numbers on either side. | |
| 3672 | ||
| 3673 | Model_Num := UR_Trunc (Loval / Small) * Small; | |
| 3674 | ||
| 3675 | if Loval = Model_Num then | |
| 3676 | Loval_Incl_EP := Model_Num; | |
| 3677 | else | |
| 3678 | Loval_Incl_EP := Model_Num - Small; | |
| 3679 | end if; | |
| 3680 | ||
| 3681 | -- The low value excluding the end point is Small greater, but | |
| 3682 | -- we do not do this exclusion if the low value is positive, | |
| 3683 | -- since it can't help the size and could actually hurt by | |
| 3684 | -- crossing the high bound. | |
| 3685 | ||
| 3686 | if UR_Is_Negative (Loval_Incl_EP) then | |
| 3687 | Loval_Excl_EP := Loval_Incl_EP + Small; | |
| 3688 | else | |
| 3689 | Loval_Excl_EP := Loval_Incl_EP; | |
| 3690 | end if; | |
| 3691 | ||
| 3692 | -- Similar processing for upper bound and high value | |
| 3693 | ||
| 3694 | Model_Num := UR_Trunc (Hival / Small) * Small; | |
| 3695 | ||
| 3696 | if Hival = Model_Num then | |
| 3697 | Hival_Incl_EP := Model_Num; | |
| 3698 | else | |
| 3699 | Hival_Incl_EP := Model_Num + Small; | |
| 3700 | end if; | |
| 3701 | ||
| 3702 | if UR_Is_Positive (Hival_Incl_EP) then | |
| 3703 | Hival_Excl_EP := Hival_Incl_EP - Small; | |
| 3704 | else | |
| 3705 | Hival_Excl_EP := Hival_Incl_EP; | |
| 3706 | end if; | |
| 3707 | ||
| 3708 | -- One further adjustment is needed. In the case of subtypes, | |
| 3709 | -- we cannot go outside the range of the base type, or we get | |
| 3710 | -- peculiarities, and the base type range is already set. This | |
| 3711 | -- only applies to the Incl values, since clearly the Excl | |
| 3712 | -- values are already as restricted as they are allowed to be. | |
| 3713 | ||
| 3714 | if Typ /= Btyp then | |
| 3715 | Loval_Incl_EP := UR_Max (Loval_Incl_EP, Realval (BLo)); | |
| 3716 | Hival_Incl_EP := UR_Min (Hival_Incl_EP, Realval (BHi)); | |
| 3717 | end if; | |
| 3718 | ||
| 3719 | -- Get size including and excluding end points | |
| 3720 | ||
| 3721 | Size_Incl_EP := Fsize (Loval_Incl_EP, Hival_Incl_EP); | |
| 3722 | Size_Excl_EP := Fsize (Loval_Excl_EP, Hival_Excl_EP); | |
| 3723 | ||
| 3724 | -- No need to exclude end-points if it does not reduce size | |
| 3725 | ||
| 3726 | if Fsize (Loval_Incl_EP, Hival_Excl_EP) = Size_Excl_EP then | |
| 3727 | Loval_Excl_EP := Loval_Incl_EP; | |
| 3728 | end if; | |
| 3729 | ||
| 3730 | if Fsize (Loval_Excl_EP, Hival_Incl_EP) = Size_Excl_EP then | |
| 3731 | Hival_Excl_EP := Hival_Incl_EP; | |
| 3732 | end if; | |
| 3733 | ||
| 3734 | -- Now we set the actual size to be used. We want to use the | |
| 3735 | -- bounds fudged up to include the end-points but only if this | |
| 3736 | -- can be done without violating a specifically given size | |
| 3737 | -- size clause or causing an unacceptable increase in size. | |
| 3738 | ||
| 3739 | -- Case of size clause given | |
| 3740 | ||
| 3741 | if Has_Size_Clause (Typ) then | |
| 3742 | ||
| 3743 | -- Use the inclusive size only if it is consistent with | |
| 3744 | -- the explicitly specified size. | |
| 3745 | ||
| 3746 | if Size_Incl_EP <= RM_Size (Typ) then | |
| 3747 | Actual_Lo := Loval_Incl_EP; | |
| 3748 | Actual_Hi := Hival_Incl_EP; | |
| 3749 | Actual_Size := Size_Incl_EP; | |
| 3750 | ||
| 3751 | -- If the inclusive size is too large, we try excluding | |
| 3752 | -- the end-points (will be caught later if does not work). | |
| 3753 | ||
| 3754 | else | |
| 3755 | Actual_Lo := Loval_Excl_EP; | |
| 3756 | Actual_Hi := Hival_Excl_EP; | |
| 3757 | Actual_Size := Size_Excl_EP; | |
| 3758 | end if; | |
| 3759 | ||
| 3760 | -- Case of size clause not given | |
| 3761 | ||
| 3762 | else | |
| 3763 | -- If we have a base type whose corresponding first subtype | |
| 3764 | -- has an explicit size that is large enough to include our | |
| 3765 | -- end-points, then do so. There is no point in working hard | |
| 3766 | -- to get a base type whose size is smaller than the specified | |
| 3767 | -- size of the first subtype. | |
| 3768 | ||
| 3769 | First_Subt := First_Subtype (Typ); | |
| 3770 | ||
| 3771 | if Has_Size_Clause (First_Subt) | |
| 3772 | and then Size_Incl_EP <= Esize (First_Subt) | |
| 3773 | then | |
| 3774 | Actual_Size := Size_Incl_EP; | |
| 3775 | Actual_Lo := Loval_Incl_EP; | |
| 3776 | Actual_Hi := Hival_Incl_EP; | |
| 3777 | ||
| 3778 | -- If excluding the end-points makes the size smaller and | |
| 3779 | -- results in a size of 8,16,32,64, then we take the smaller | |
| 3780 | -- size. For the 64 case, this is compulsory. For the other | |
| 3781 | -- cases, it seems reasonable. We like to include end points | |
| 3782 | -- if we can, but not at the expense of moving to the next | |
| 3783 | -- natural boundary of size. | |
| 3784 | ||
| 3785 | elsif Size_Incl_EP /= Size_Excl_EP | |
| 3786 | and then | |
| 3787 | (Size_Excl_EP = 8 or else | |
| 3788 | Size_Excl_EP = 16 or else | |
| 3789 | Size_Excl_EP = 32 or else | |
| 3790 | Size_Excl_EP = 64) | |
| 3791 | then | |
| 3792 | Actual_Size := Size_Excl_EP; | |
| 3793 | Actual_Lo := Loval_Excl_EP; | |
| 3794 | Actual_Hi := Hival_Excl_EP; | |
| 3795 | ||
| 3796 | -- Otherwise we can definitely include the end points | |
| 3797 | ||
| 3798 | else | |
| 3799 | Actual_Size := Size_Incl_EP; | |
| 3800 | Actual_Lo := Loval_Incl_EP; | |
| 3801 | Actual_Hi := Hival_Incl_EP; | |
| 3802 | end if; | |
| 3803 | ||
| 3804 | -- One pathological case: normally we never fudge a low | |
| 3805 | -- bound down, since it would seem to increase the size | |
| 3806 | -- (if it has any effect), but for ranges containing a | |
| 3807 | -- single value, or no values, the high bound can be | |
| 3808 | -- small too large. Consider: | |
| 3809 | ||
| 3810 | -- type t is delta 2.0**(-14) | |
| 3811 | -- range 131072.0 .. 0; | |
| 3812 | ||
| 3813 | -- That lower bound is *just* outside the range of 32 | |
| 3814 | -- bits, and does need fudging down in this case. Note | |
| 3815 | -- that the bounds will always have crossed here, since | |
| 3816 | -- the high bound will be fudged down if necessary, as | |
| 3817 | -- in the case of: | |
| 3818 | ||
| 3819 | -- type t is delta 2.0**(-14) | |
| 3820 | -- range 131072.0 .. 131072.0; | |
| 3821 | ||
| 3822 | -- So we can detect the situation by looking for crossed | |
| 3823 | -- bounds, and if the bounds are crossed, and the low | |
| 3824 | -- bound is greater than zero, we will always back it | |
| 3825 | -- off by small, since this is completely harmless. | |
| 3826 | ||
| 3827 | if Actual_Lo > Actual_Hi then | |
| 3828 | if UR_Is_Positive (Actual_Lo) then | |
| 3829 | Actual_Lo := Loval_Incl_EP - Small; | |
| 3830 | Actual_Size := Fsize (Actual_Lo, Actual_Hi); | |
| 3831 | ||
| 3832 | -- And of course, we need to do exactly the same parallel | |
| 3833 | -- fudge for flat ranges in the negative region. | |
| 3834 | ||
| 3835 | elsif UR_Is_Negative (Actual_Hi) then | |
| 3836 | Actual_Hi := Hival_Incl_EP + Small; | |
| 3837 | Actual_Size := Fsize (Actual_Lo, Actual_Hi); | |
| 3838 | end if; | |
| 3839 | end if; | |
| 3840 | end if; | |
| 3841 | ||
| 3842 | Set_Realval (Lo, Actual_Lo); | |
| 3843 | Set_Realval (Hi, Actual_Hi); | |
| 3844 | end Fudge; | |
| 3845 | ||
| 3846 | -- For the decimal case, none of this fudging is required, since there | |
| 3847 | -- are no end-point problems in the decimal case (the end-points are | |
| 3848 | -- always included). | |
| 3849 | ||
| 3850 | else | |
| 3851 | Actual_Size := Fsize (Loval, Hival); | |
| 3852 | end if; | |
| 3853 | ||
| 3854 | -- At this stage, the actual size has been calculated and the proper | |
| 3855 | -- required bounds are stored in the low and high bounds. | |
| 3856 | ||
| 3857 | if Actual_Size > 64 then | |
| 3858 | Error_Msg_Uint_1 := UI_From_Int (Actual_Size); | |
| 3859 | Error_Msg_N | |
| 3860 | ("size required (^) for type& too large, maximum is 64", Typ); | |
| 3861 | Actual_Size := 64; | |
| 3862 | end if; | |
| 3863 | ||
| 3864 | -- Check size against explicit given size | |
| 3865 | ||
| 3866 | if Has_Size_Clause (Typ) then | |
| 3867 | if Actual_Size > RM_Size (Typ) then | |
| 3868 | Error_Msg_Uint_1 := RM_Size (Typ); | |
| 3869 | Error_Msg_Uint_2 := UI_From_Int (Actual_Size); | |
| 3870 | Error_Msg_NE | |
| 3871 | ("size given (^) for type& too small, minimum is ^", | |
| 3872 | Size_Clause (Typ), Typ); | |
| 3873 | ||
| 3874 | else | |
| 3875 | Actual_Size := UI_To_Int (Esize (Typ)); | |
| 3876 | end if; | |
| 3877 | ||
| 3878 | -- Increase size to next natural boundary if no size clause given | |
| 3879 | ||
| 3880 | else | |
| 3881 | if Actual_Size <= 8 then | |
| 3882 | Actual_Size := 8; | |
| 3883 | elsif Actual_Size <= 16 then | |
| 3884 | Actual_Size := 16; | |
| 3885 | elsif Actual_Size <= 32 then | |
| 3886 | Actual_Size := 32; | |
| 3887 | else | |
| 3888 | Actual_Size := 64; | |
| 3889 | end if; | |
| 3890 | ||
| 3891 | Init_Esize (Typ, Actual_Size); | |
| 3892 | Adjust_Esize_For_Alignment (Typ); | |
| 3893 | end if; | |
| 3894 | ||
| 3895 | -- If we have a base type, then expand the bounds so that they | |
| 3896 | -- extend to the full width of the allocated size in bits, to | |
| 3897 | -- avoid junk range checks on intermediate computations. | |
| 3898 | ||
| 3899 | if Base_Type (Typ) = Typ then | |
| 3900 | Set_Realval (Lo, -(Small * (Uint_2 ** (Actual_Size - 1)))); | |
| 3901 | Set_Realval (Hi, (Small * (Uint_2 ** (Actual_Size - 1) - 1))); | |
| 3902 | end if; | |
| 3903 | ||
| 3904 | -- Final step is to reanalyze the bounds using the proper type | |
| 3905 | -- and set the Corresponding_Integer_Value fields of the literals. | |
| 3906 | ||
| 3907 | Set_Etype (Lo, Empty); | |
| 3908 | Set_Analyzed (Lo, False); | |
| 3909 | Analyze (Lo); | |
| 3910 | ||
| 3911 | -- Resolve with universal fixed if the base type, and the base | |
| 3912 | -- type if it is a subtype. Note we can't resolve the base type | |
| 3913 | -- with itself, that would be a reference before definition. | |
| 3914 | ||
| 3915 | if Typ = Btyp then | |
| 3916 | Resolve (Lo, Universal_Fixed); | |
| 3917 | else | |
| 3918 | Resolve (Lo, Btyp); | |
| 3919 | end if; | |
| 3920 | ||
| 3921 | -- Set corresponding integer value for bound | |
| 3922 | ||
| 3923 | Set_Corresponding_Integer_Value | |
| 3924 | (Lo, UR_To_Uint (Realval (Lo) / Small)); | |
| 3925 | ||
| 3926 | -- Similar processing for high bound | |
| 3927 | ||
| 3928 | Set_Etype (Hi, Empty); | |
| 3929 | Set_Analyzed (Hi, False); | |
| 3930 | Analyze (Hi); | |
| 3931 | ||
| 3932 | if Typ = Btyp then | |
| 3933 | Resolve (Hi, Universal_Fixed); | |
| 3934 | else | |
| 3935 | Resolve (Hi, Btyp); | |
| 3936 | end if; | |
| 3937 | ||
| 3938 | Set_Corresponding_Integer_Value | |
| 3939 | (Hi, UR_To_Uint (Realval (Hi) / Small)); | |
| 3940 | ||
| 3941 | -- Set type of range to correspond to bounds | |
| 3942 | ||
| 3943 | Set_Etype (Rng, Etype (Lo)); | |
| 3944 | ||
| fbf5a39b | 3945 | -- Set Esize to calculated size if not set already |
| 70482933 | 3946 | |
| fbf5a39b AC |
3947 | if Unknown_Esize (Typ) then |
| 3948 | Init_Esize (Typ, Actual_Size); | |
| 3949 | end if; | |
| 70482933 RK |
3950 | |
| 3951 | -- Set RM_Size if not already set. If already set, check value | |
| 3952 | ||
| 3953 | declare | |
| 3954 | Minsiz : constant Uint := UI_From_Int (Minimum_Size (Typ)); | |
| 3955 | ||
| 3956 | begin | |
| 3957 | if RM_Size (Typ) /= Uint_0 then | |
| 3958 | if RM_Size (Typ) < Minsiz then | |
| 3959 | Error_Msg_Uint_1 := RM_Size (Typ); | |
| 3960 | Error_Msg_Uint_2 := Minsiz; | |
| 3961 | Error_Msg_NE | |
| 3962 | ("size given (^) for type& too small, minimum is ^", | |
| 3963 | Size_Clause (Typ), Typ); | |
| 3964 | end if; | |
| 3965 | ||
| 3966 | else | |
| 3967 | Set_RM_Size (Typ, Minsiz); | |
| 3968 | end if; | |
| 3969 | end; | |
| 70482933 RK |
3970 | end Freeze_Fixed_Point_Type; |
| 3971 | ||
| 3972 | ------------------ | |
| 3973 | -- Freeze_Itype -- | |
| 3974 | ------------------ | |
| 3975 | ||
| 3976 | procedure Freeze_Itype (T : Entity_Id; N : Node_Id) is | |
| 3977 | L : List_Id; | |
| 3978 | ||
| 3979 | begin | |
| 3980 | Set_Has_Delayed_Freeze (T); | |
| 3981 | L := Freeze_Entity (T, Sloc (N)); | |
| 3982 | ||
| 3983 | if Is_Non_Empty_List (L) then | |
| 3984 | Insert_Actions (N, L); | |
| 3985 | end if; | |
| 3986 | end Freeze_Itype; | |
| 3987 | ||
| 3988 | -------------------------- | |
| 3989 | -- Freeze_Static_Object -- | |
| 3990 | -------------------------- | |
| 3991 | ||
| 3992 | procedure Freeze_Static_Object (E : Entity_Id) is | |
| 3993 | ||
| 3994 | Cannot_Be_Static : exception; | |
| 3995 | -- Exception raised if the type of a static object cannot be made | |
| 3996 | -- static. This happens if the type depends on non-global objects. | |
| 3997 | ||
| 3998 | procedure Ensure_Expression_Is_SA (N : Node_Id); | |
| 3999 | -- Called to ensure that an expression used as part of a type | |
| 4000 | -- definition is statically allocatable, which means that the type | |
| 4001 | -- of the expression is statically allocatable, and the expression | |
| 4002 | -- is either static, or a reference to a library level constant. | |
| 4003 | ||
| 4004 | procedure Ensure_Type_Is_SA (Typ : Entity_Id); | |
| 4005 | -- Called to mark a type as static, checking that it is possible | |
| 4006 | -- to set the type as static. If it is not possible, then the | |
| 4007 | -- exception Cannot_Be_Static is raised. | |
| 4008 | ||
| 4009 | ----------------------------- | |
| 4010 | -- Ensure_Expression_Is_SA -- | |
| 4011 | ----------------------------- | |
| 4012 | ||
| 4013 | procedure Ensure_Expression_Is_SA (N : Node_Id) is | |
| 4014 | Ent : Entity_Id; | |
| 4015 | ||
| 4016 | begin | |
| 4017 | Ensure_Type_Is_SA (Etype (N)); | |
| 4018 | ||
| 4019 | if Is_Static_Expression (N) then | |
| 4020 | return; | |
| 4021 | ||
| 4022 | elsif Nkind (N) = N_Identifier then | |
| 4023 | Ent := Entity (N); | |
| 4024 | ||
| 4025 | if Present (Ent) | |
| 4026 | and then Ekind (Ent) = E_Constant | |
| 4027 | and then Is_Library_Level_Entity (Ent) | |
| 4028 | then | |
| 4029 | return; | |
| 4030 | end if; | |
| 4031 | end if; | |
| 4032 | ||
| 4033 | raise Cannot_Be_Static; | |
| 4034 | end Ensure_Expression_Is_SA; | |
| 4035 | ||
| 4036 | ----------------------- | |
| 4037 | -- Ensure_Type_Is_SA -- | |
| 4038 | ----------------------- | |
| 4039 | ||
| 4040 | procedure Ensure_Type_Is_SA (Typ : Entity_Id) is | |
| 4041 | N : Node_Id; | |
| 4042 | C : Entity_Id; | |
| 4043 | ||
| 4044 | begin | |
| 4045 | -- If type is library level, we are all set | |
| 4046 | ||
| 4047 | if Is_Library_Level_Entity (Typ) then | |
| 4048 | return; | |
| 4049 | end if; | |
| 4050 | ||
| 4051 | -- We are also OK if the type is already marked as statically | |
| 4052 | -- allocated, which means we processed it before. | |
| 4053 | ||
| 4054 | if Is_Statically_Allocated (Typ) then | |
| 4055 | return; | |
| 4056 | end if; | |
| 4057 | ||
| 4058 | -- Mark type as statically allocated | |
| 4059 | ||
| 4060 | Set_Is_Statically_Allocated (Typ); | |
| 4061 | ||
| 4062 | -- Check that it is safe to statically allocate this type | |
| 4063 | ||
| 4064 | if Is_Scalar_Type (Typ) or else Is_Real_Type (Typ) then | |
| 4065 | Ensure_Expression_Is_SA (Type_Low_Bound (Typ)); | |
| 4066 | Ensure_Expression_Is_SA (Type_High_Bound (Typ)); | |
| 4067 | ||
| 4068 | elsif Is_Array_Type (Typ) then | |
| 4069 | N := First_Index (Typ); | |
| 4070 | while Present (N) loop | |
| 4071 | Ensure_Type_Is_SA (Etype (N)); | |
| 4072 | Next_Index (N); | |
| 4073 | end loop; | |
| 4074 | ||
| 4075 | Ensure_Type_Is_SA (Component_Type (Typ)); | |
| 4076 | ||
| 4077 | elsif Is_Access_Type (Typ) then | |
| 4078 | if Ekind (Designated_Type (Typ)) = E_Subprogram_Type then | |
| 4079 | ||
| 4080 | declare | |
| 4081 | F : Entity_Id; | |
| 4082 | T : constant Entity_Id := Etype (Designated_Type (Typ)); | |
| 4083 | ||
| 4084 | begin | |
| 4085 | if T /= Standard_Void_Type then | |
| 4086 | Ensure_Type_Is_SA (T); | |
| 4087 | end if; | |
| 4088 | ||
| 4089 | F := First_Formal (Designated_Type (Typ)); | |
| 4090 | ||
| 4091 | while Present (F) loop | |
| 4092 | Ensure_Type_Is_SA (Etype (F)); | |
| 4093 | Next_Formal (F); | |
| 4094 | end loop; | |
| 4095 | end; | |
| 4096 | ||
| 4097 | else | |
| 4098 | Ensure_Type_Is_SA (Designated_Type (Typ)); | |
| 4099 | end if; | |
| 4100 | ||
| 4101 | elsif Is_Record_Type (Typ) then | |
| 4102 | C := First_Entity (Typ); | |
| 4103 | ||
| 4104 | while Present (C) loop | |
| 4105 | if Ekind (C) = E_Discriminant | |
| 4106 | or else Ekind (C) = E_Component | |
| 4107 | then | |
| 4108 | Ensure_Type_Is_SA (Etype (C)); | |
| 4109 | ||
| 4110 | elsif Is_Type (C) then | |
| 4111 | Ensure_Type_Is_SA (C); | |
| 4112 | end if; | |
| 4113 | ||
| 4114 | Next_Entity (C); | |
| 4115 | end loop; | |
| 4116 | ||
| 4117 | elsif Ekind (Typ) = E_Subprogram_Type then | |
| 4118 | Ensure_Type_Is_SA (Etype (Typ)); | |
| 4119 | ||
| 4120 | C := First_Formal (Typ); | |
| 4121 | while Present (C) loop | |
| 4122 | Ensure_Type_Is_SA (Etype (C)); | |
| 4123 | Next_Formal (C); | |
| 4124 | end loop; | |
| 4125 | ||
| 4126 | else | |
| 4127 | raise Cannot_Be_Static; | |
| 4128 | end if; | |
| 4129 | end Ensure_Type_Is_SA; | |
| 4130 | ||
| 4131 | -- Start of processing for Freeze_Static_Object | |
| 4132 | ||
| 4133 | begin | |
| 4134 | Ensure_Type_Is_SA (Etype (E)); | |
| 4135 | ||
| fbf5a39b AC |
4136 | -- Reset True_Constant flag, since something strange is going on |
| 4137 | -- with the scoping here, and our simple value traceing may not | |
| 4138 | -- be sufficient for this indication to be reliable. We kill the | |
| 4139 | -- Constant_Value indication for the same reason. | |
| 4140 | ||
| 4141 | Set_Is_True_Constant (E, False); | |
| 4142 | Set_Current_Value (E, Empty); | |
| 4143 | ||
| 70482933 RK |
4144 | exception |
| 4145 | when Cannot_Be_Static => | |
| 4146 | ||
| 4147 | -- If the object that cannot be static is imported or exported, | |
| 4148 | -- then we give an error message saying that this object cannot | |
| 4149 | -- be imported or exported. | |
| 4150 | ||
| 4151 | if Is_Imported (E) then | |
| 4152 | Error_Msg_N | |
| 4153 | ("& cannot be imported (local type is not constant)", E); | |
| 4154 | ||
| 4155 | -- Otherwise must be exported, something is wrong if compiler | |
| 4156 | -- is marking something as statically allocated which cannot be). | |
| 4157 | ||
| 4158 | else pragma Assert (Is_Exported (E)); | |
| 4159 | Error_Msg_N | |
| 4160 | ("& cannot be exported (local type is not constant)", E); | |
| 4161 | end if; | |
| 4162 | end Freeze_Static_Object; | |
| 4163 | ||
| 4164 | ----------------------- | |
| 4165 | -- Freeze_Subprogram -- | |
| 4166 | ----------------------- | |
| 4167 | ||
| 4168 | procedure Freeze_Subprogram (E : Entity_Id) is | |
| 4169 | Retype : Entity_Id; | |
| 4170 | F : Entity_Id; | |
| 4171 | ||
| 4172 | begin | |
| 4173 | -- Subprogram may not have an address clause unless it is imported | |
| 4174 | ||
| 4175 | if Present (Address_Clause (E)) then | |
| 4176 | if not Is_Imported (E) then | |
| 4177 | Error_Msg_N | |
| 4178 | ("address clause can only be given " & | |
| 4179 | "for imported subprogram", | |
| 4180 | Name (Address_Clause (E))); | |
| 4181 | end if; | |
| 4182 | end if; | |
| 4183 | ||
| 91b1417d AC |
4184 | -- Reset the Pure indication on an imported subprogram unless an |
| 4185 | -- explicit Pure_Function pragma was present. We do this because | |
| 4186 | -- otherwise it is an insidious error to call a non-pure function | |
| 4187 | -- from a pure unit and have calls mysteriously optimized away. | |
| 4188 | -- What happens here is that the Import can bypass the normal | |
| 4189 | -- check to ensure that pure units call only pure subprograms. | |
| 4190 | ||
| 4191 | if Is_Imported (E) | |
| 4192 | and then Is_Pure (E) | |
| 4193 | and then not Has_Pragma_Pure_Function (E) | |
| 4194 | then | |
| 4195 | Set_Is_Pure (E, False); | |
| 4196 | end if; | |
| 4197 | ||
| 70482933 RK |
4198 | -- For non-foreign convention subprograms, this is where we create |
| 4199 | -- the extra formals (for accessibility level and constrained bit | |
| 4200 | -- information). We delay this till the freeze point precisely so | |
| 4201 | -- that we know the convention! | |
| 4202 | ||
| 4203 | if not Has_Foreign_Convention (E) then | |
| 4204 | Create_Extra_Formals (E); | |
| 4205 | Set_Mechanisms (E); | |
| 4206 | ||
| 4207 | -- If this is convention Ada and a Valued_Procedure, that's odd | |
| 4208 | ||
| 4209 | if Ekind (E) = E_Procedure | |
| 4210 | and then Is_Valued_Procedure (E) | |
| 4211 | and then Convention (E) = Convention_Ada | |
| fbf5a39b | 4212 | and then Warn_On_Export_Import |
| 70482933 RK |
4213 | then |
| 4214 | Error_Msg_N | |
| 4215 | ("?Valued_Procedure has no effect for convention Ada", E); | |
| 4216 | Set_Is_Valued_Procedure (E, False); | |
| 4217 | end if; | |
| 4218 | ||
| 4219 | -- Case of foreign convention | |
| 4220 | ||
| 4221 | else | |
| 4222 | Set_Mechanisms (E); | |
| 4223 | ||
| fbf5a39b | 4224 | -- For foreign conventions, warn about return of an |
| 70482933 RK |
4225 | -- unconstrained array. |
| 4226 | ||
| 4227 | -- Note: we *do* allow a return by descriptor for the VMS case, | |
| 4228 | -- though here there is probably more to be done ??? | |
| 4229 | ||
| 4230 | if Ekind (E) = E_Function then | |
| 4231 | Retype := Underlying_Type (Etype (E)); | |
| 4232 | ||
| 4233 | -- If no return type, probably some other error, e.g. a | |
| 4234 | -- missing full declaration, so ignore. | |
| 4235 | ||
| 4236 | if No (Retype) then | |
| 4237 | null; | |
| 4238 | ||
| 4239 | -- If the return type is generic, we have emitted a warning | |
| 4240 | -- earlier on, and there is nothing else to check here. | |
| 4241 | -- Specific instantiations may lead to erroneous behavior. | |
| 4242 | ||
| 4243 | elsif Is_Generic_Type (Etype (E)) then | |
| 4244 | null; | |
| 4245 | ||
| 4246 | elsif Is_Array_Type (Retype) | |
| 4247 | and then not Is_Constrained (Retype) | |
| 4248 | and then Mechanism (E) not in Descriptor_Codes | |
| fbf5a39b | 4249 | and then Warn_On_Export_Import |
| 70482933 | 4250 | then |
| fbf5a39b AC |
4251 | Error_Msg_N |
| 4252 | ("?foreign convention function& should not return " & | |
| 4253 | "unconstrained array", E); | |
| 70482933 RK |
4254 | return; |
| 4255 | end if; | |
| 4256 | end if; | |
| 4257 | ||
| 4258 | -- If any of the formals for an exported foreign convention | |
| 4259 | -- subprogram have defaults, then emit an appropriate warning | |
| 4260 | -- since this is odd (default cannot be used from non-Ada code) | |
| 4261 | ||
| 4262 | if Is_Exported (E) then | |
| 4263 | F := First_Formal (E); | |
| 4264 | while Present (F) loop | |
| fbf5a39b AC |
4265 | if Warn_On_Export_Import |
| 4266 | and then Present (Default_Value (F)) | |
| 4267 | then | |
| 70482933 RK |
4268 | Error_Msg_N |
| 4269 | ("?parameter cannot be defaulted in non-Ada call", | |
| 4270 | Default_Value (F)); | |
| 4271 | end if; | |
| 4272 | ||
| 4273 | Next_Formal (F); | |
| 4274 | end loop; | |
| 4275 | end if; | |
| 4276 | end if; | |
| 4277 | ||
| 4278 | -- For VMS, descriptor mechanisms for parameters are allowed only | |
| 4279 | -- for imported subprograms. | |
| 4280 | ||
| 4281 | if OpenVMS_On_Target then | |
| 4282 | if not Is_Imported (E) then | |
| 4283 | F := First_Formal (E); | |
| 4284 | while Present (F) loop | |
| 4285 | if Mechanism (F) in Descriptor_Codes then | |
| 4286 | Error_Msg_N | |
| 4287 | ("descriptor mechanism for parameter not permitted", F); | |
| 4288 | Error_Msg_N | |
| 4289 | ("\can only be used for imported subprogram", F); | |
| 4290 | end if; | |
| 4291 | ||
| 4292 | Next_Formal (F); | |
| 4293 | end loop; | |
| 4294 | end if; | |
| 4295 | end if; | |
| 70482933 RK |
4296 | end Freeze_Subprogram; |
| 4297 | ||
| 4298 | ----------------------- | |
| 4299 | -- Is_Fully_Defined -- | |
| 4300 | ----------------------- | |
| 4301 | ||
| 70482933 RK |
4302 | function Is_Fully_Defined (T : Entity_Id) return Boolean is |
| 4303 | begin | |
| 4304 | if Ekind (T) = E_Class_Wide_Type then | |
| 4305 | return Is_Fully_Defined (Etype (T)); | |
| 657a9dd9 AC |
4306 | |
| 4307 | elsif Is_Array_Type (T) then | |
| 4308 | return Is_Fully_Defined (Component_Type (T)); | |
| 4309 | ||
| 4310 | elsif Is_Record_Type (T) | |
| 4311 | and not Is_Private_Type (T) | |
| 4312 | then | |
| 657a9dd9 AC |
4313 | -- Verify that the record type has no components with |
| 4314 | -- private types without completion. | |
| 4315 | ||
| 4316 | declare | |
| 4317 | Comp : Entity_Id; | |
| bde58e32 | 4318 | |
| 657a9dd9 AC |
4319 | begin |
| 4320 | Comp := First_Component (T); | |
| 4321 | ||
| 4322 | while Present (Comp) loop | |
| 4323 | if not Is_Fully_Defined (Etype (Comp)) then | |
| 4324 | return False; | |
| 4325 | end if; | |
| 4326 | ||
| 4327 | Next_Component (Comp); | |
| 4328 | end loop; | |
| 4329 | return True; | |
| 4330 | end; | |
| 4331 | ||
| 4332 | else return not Is_Private_Type (T) | |
| 4333 | or else Present (Full_View (Base_Type (T))); | |
| 70482933 RK |
4334 | end if; |
| 4335 | end Is_Fully_Defined; | |
| 4336 | ||
| 4337 | --------------------------------- | |
| 4338 | -- Process_Default_Expressions -- | |
| 4339 | --------------------------------- | |
| 4340 | ||
| 4341 | procedure Process_Default_Expressions | |
| 4342 | (E : Entity_Id; | |
| 4343 | After : in out Node_Id) | |
| 4344 | is | |
| 4345 | Loc : constant Source_Ptr := Sloc (E); | |
| 4346 | Dbody : Node_Id; | |
| 4347 | Formal : Node_Id; | |
| 4348 | Dcopy : Node_Id; | |
| 4349 | Dnam : Entity_Id; | |
| 4350 | ||
| 4351 | begin | |
| 4352 | Set_Default_Expressions_Processed (E); | |
| 4353 | ||
| 4354 | -- A subprogram instance and its associated anonymous subprogram | |
| 4355 | -- share their signature. The default expression functions are defined | |
| 4356 | -- in the wrapper packages for the anonymous subprogram, and should | |
| 4357 | -- not be generated again for the instance. | |
| 4358 | ||
| 4359 | if Is_Generic_Instance (E) | |
| 4360 | and then Present (Alias (E)) | |
| 4361 | and then Default_Expressions_Processed (Alias (E)) | |
| 4362 | then | |
| 4363 | return; | |
| 4364 | end if; | |
| 4365 | ||
| 4366 | Formal := First_Formal (E); | |
| 4367 | ||
| 4368 | while Present (Formal) loop | |
| 4369 | if Present (Default_Value (Formal)) then | |
| 4370 | ||
| 4371 | -- We work with a copy of the default expression because we | |
| 4372 | -- do not want to disturb the original, since this would mess | |
| 4373 | -- up the conformance checking. | |
| 4374 | ||
| 4375 | Dcopy := New_Copy_Tree (Default_Value (Formal)); | |
| 4376 | ||
| 4377 | -- The analysis of the expression may generate insert actions, | |
| 4378 | -- which of course must not be executed. We wrap those actions | |
| 4379 | -- in a procedure that is not called, and later on eliminated. | |
| 4380 | -- The following cases have no side-effects, and are analyzed | |
| 4381 | -- directly. | |
| 4382 | ||
| 4383 | if Nkind (Dcopy) = N_Identifier | |
| 4384 | or else Nkind (Dcopy) = N_Expanded_Name | |
| 4385 | or else Nkind (Dcopy) = N_Integer_Literal | |
| 4386 | or else (Nkind (Dcopy) = N_Real_Literal | |
| 4387 | and then not Vax_Float (Etype (Dcopy))) | |
| 4388 | or else Nkind (Dcopy) = N_Character_Literal | |
| 4389 | or else Nkind (Dcopy) = N_String_Literal | |
| 4390 | or else Nkind (Dcopy) = N_Null | |
| 4391 | or else (Nkind (Dcopy) = N_Attribute_Reference | |
| 4392 | and then | |
| 4393 | Attribute_Name (Dcopy) = Name_Null_Parameter) | |
| 70482933 RK |
4394 | then |
| 4395 | ||
| 4396 | -- If there is no default function, we must still do a full | |
| 4397 | -- analyze call on the default value, to ensure that all | |
| 4398 | -- error checks are performed, e.g. those associated with | |
| 4399 | -- static evaluation. Note that this branch will always be | |
| 4400 | -- taken if the analyzer is turned off (but we still need the | |
| 4401 | -- error checks). | |
| 4402 | ||
| 4403 | -- Note: the setting of parent here is to meet the requirement | |
| 4404 | -- that we can only analyze the expression while attached to | |
| 4405 | -- the tree. Really the requirement is that the parent chain | |
| 4406 | -- be set, we don't actually need to be in the tree. | |
| 4407 | ||
| 4408 | Set_Parent (Dcopy, Declaration_Node (Formal)); | |
| 4409 | Analyze (Dcopy); | |
| 4410 | ||
| 4411 | -- Default expressions are resolved with their own type if the | |
| 4412 | -- context is generic, to avoid anomalies with private types. | |
| 4413 | ||
| 4414 | if Ekind (Scope (E)) = E_Generic_Package then | |
| fbf5a39b | 4415 | Resolve (Dcopy); |
| 70482933 RK |
4416 | else |
| 4417 | Resolve (Dcopy, Etype (Formal)); | |
| 4418 | end if; | |
| 4419 | ||
| 4420 | -- If that resolved expression will raise constraint error, | |
| 4421 | -- then flag the default value as raising constraint error. | |
| 4422 | -- This allows a proper error message on the calls. | |
| 4423 | ||
| 4424 | if Raises_Constraint_Error (Dcopy) then | |
| 4425 | Set_Raises_Constraint_Error (Default_Value (Formal)); | |
| 4426 | end if; | |
| 4427 | ||
| 4428 | -- If the default is a parameterless call, we use the name of | |
| 4429 | -- the called function directly, and there is no body to build. | |
| 4430 | ||
| 4431 | elsif Nkind (Dcopy) = N_Function_Call | |
| 4432 | and then No (Parameter_Associations (Dcopy)) | |
| 4433 | then | |
| 4434 | null; | |
| 4435 | ||
| 4436 | -- Else construct and analyze the body of a wrapper procedure | |
| 4437 | -- that contains an object declaration to hold the expression. | |
| 4438 | -- Given that this is done only to complete the analysis, it | |
| 4439 | -- simpler to build a procedure than a function which might | |
| 4440 | -- involve secondary stack expansion. | |
| 4441 | ||
| 4442 | else | |
| 4443 | Dnam := | |
| 4444 | Make_Defining_Identifier (Loc, New_Internal_Name ('D')); | |
| 4445 | ||
| 4446 | Dbody := | |
| 4447 | Make_Subprogram_Body (Loc, | |
| 4448 | Specification => | |
| 4449 | Make_Procedure_Specification (Loc, | |
| 4450 | Defining_Unit_Name => Dnam), | |
| 4451 | ||
| 4452 | Declarations => New_List ( | |
| 4453 | Make_Object_Declaration (Loc, | |
| 4454 | Defining_Identifier => | |
| 4455 | Make_Defining_Identifier (Loc, | |
| 4456 | New_Internal_Name ('T')), | |
| 4457 | Object_Definition => | |
| 4458 | New_Occurrence_Of (Etype (Formal), Loc), | |
| 4459 | Expression => New_Copy_Tree (Dcopy))), | |
| 4460 | ||
| 4461 | Handled_Statement_Sequence => | |
| 4462 | Make_Handled_Sequence_Of_Statements (Loc, | |
| 4463 | Statements => New_List)); | |
| 4464 | ||
| 4465 | Set_Scope (Dnam, Scope (E)); | |
| 4466 | Set_Assignment_OK (First (Declarations (Dbody))); | |
| 4467 | Set_Is_Eliminated (Dnam); | |
| 4468 | Insert_After (After, Dbody); | |
| 4469 | Analyze (Dbody); | |
| 4470 | After := Dbody; | |
| 4471 | end if; | |
| 4472 | end if; | |
| 4473 | ||
| 4474 | Next_Formal (Formal); | |
| 4475 | end loop; | |
| 4476 | ||
| 4477 | end Process_Default_Expressions; | |
| 4478 | ||
| 4479 | ---------------------------------------- | |
| 4480 | -- Set_Component_Alignment_If_Not_Set -- | |
| 4481 | ---------------------------------------- | |
| 4482 | ||
| 4483 | procedure Set_Component_Alignment_If_Not_Set (Typ : Entity_Id) is | |
| 4484 | begin | |
| 4485 | -- Ignore if not base type, subtypes don't need anything | |
| 4486 | ||
| 4487 | if Typ /= Base_Type (Typ) then | |
| 4488 | return; | |
| 4489 | end if; | |
| 4490 | ||
| 4491 | -- Do not override existing representation | |
| 4492 | ||
| 4493 | if Is_Packed (Typ) then | |
| 4494 | return; | |
| 4495 | ||
| 4496 | elsif Has_Specified_Layout (Typ) then | |
| 4497 | return; | |
| 4498 | ||
| 4499 | elsif Component_Alignment (Typ) /= Calign_Default then | |
| 4500 | return; | |
| 4501 | ||
| 4502 | else | |
| 4503 | Set_Component_Alignment | |
| 4504 | (Typ, Scope_Stack.Table | |
| 4505 | (Scope_Stack.Last).Component_Alignment_Default); | |
| 4506 | end if; | |
| 4507 | end Set_Component_Alignment_If_Not_Set; | |
| 4508 | ||
| 4509 | --------------------------- | |
| 4510 | -- Set_Debug_Info_Needed -- | |
| 4511 | --------------------------- | |
| 4512 | ||
| 4513 | procedure Set_Debug_Info_Needed (T : Entity_Id) is | |
| 4514 | begin | |
| 4515 | if No (T) | |
| 4516 | or else Needs_Debug_Info (T) | |
| 4517 | or else Debug_Info_Off (T) | |
| 4518 | then | |
| 4519 | return; | |
| 4520 | else | |
| 4521 | Set_Needs_Debug_Info (T); | |
| 4522 | end if; | |
| 4523 | ||
| 4524 | if Is_Object (T) then | |
| 4525 | Set_Debug_Info_Needed (Etype (T)); | |
| 4526 | ||
| 4527 | elsif Is_Type (T) then | |
| 4528 | Set_Debug_Info_Needed (Etype (T)); | |
| 4529 | ||
| 4530 | if Is_Record_Type (T) then | |
| 4531 | declare | |
| 4532 | Ent : Entity_Id := First_Entity (T); | |
| 4533 | begin | |
| 4534 | while Present (Ent) loop | |
| 4535 | Set_Debug_Info_Needed (Ent); | |
| 4536 | Next_Entity (Ent); | |
| 4537 | end loop; | |
| 4538 | end; | |
| 4539 | ||
| 4540 | elsif Is_Array_Type (T) then | |
| 4541 | Set_Debug_Info_Needed (Component_Type (T)); | |
| 4542 | ||
| 4543 | declare | |
| 4544 | Indx : Node_Id := First_Index (T); | |
| 4545 | begin | |
| 4546 | while Present (Indx) loop | |
| 4547 | Set_Debug_Info_Needed (Etype (Indx)); | |
| 4548 | Indx := Next_Index (Indx); | |
| 4549 | end loop; | |
| 4550 | end; | |
| 4551 | ||
| 4552 | if Is_Packed (T) then | |
| 4553 | Set_Debug_Info_Needed (Packed_Array_Type (T)); | |
| 4554 | end if; | |
| 4555 | ||
| 4556 | elsif Is_Access_Type (T) then | |
| 4557 | Set_Debug_Info_Needed (Directly_Designated_Type (T)); | |
| 4558 | ||
| 4559 | elsif Is_Private_Type (T) then | |
| 4560 | Set_Debug_Info_Needed (Full_View (T)); | |
| 4561 | ||
| 4562 | elsif Is_Protected_Type (T) then | |
| 4563 | Set_Debug_Info_Needed (Corresponding_Record_Type (T)); | |
| 4564 | end if; | |
| 4565 | end if; | |
| 70482933 RK |
4566 | end Set_Debug_Info_Needed; |
| 4567 | ||
| fbf5a39b AC |
4568 | ------------------ |
| 4569 | -- Warn_Overlay -- | |
| 4570 | ------------------ | |
| 4571 | ||
| 4572 | procedure Warn_Overlay | |
| 4573 | (Expr : Node_Id; | |
| 4574 | Typ : Entity_Id; | |
| 4575 | Nam : Entity_Id) | |
| 4576 | is | |
| 4577 | Ent : constant Entity_Id := Entity (Nam); | |
| 4578 | -- The object to which the address clause applies. | |
| 4579 | ||
| 4580 | Init : Node_Id; | |
| 4581 | Old : Entity_Id := Empty; | |
| 4582 | Decl : Node_Id; | |
| 4583 | ||
| 4584 | begin | |
| 4585 | -- No warning if address clause overlay warnings are off | |
| 4586 | ||
| 4587 | if not Address_Clause_Overlay_Warnings then | |
| 4588 | return; | |
| 4589 | end if; | |
| 4590 | ||
| 4591 | -- No warning if there is an explicit initialization | |
| 4592 | ||
| 4593 | Init := Original_Node (Expression (Declaration_Node (Ent))); | |
| 4594 | ||
| 4595 | if Present (Init) and then Comes_From_Source (Init) then | |
| 4596 | return; | |
| 4597 | end if; | |
| 4598 | ||
| 4599 | -- We only give the warning for non-imported entities of a type | |
| 4600 | -- for which a non-null base init proc is defined (or for access | |
| 4601 | -- types which have implicit null initialization). | |
| 4602 | ||
| 4603 | if Present (Expr) | |
| 4604 | and then (Has_Non_Null_Base_Init_Proc (Typ) | |
| 4605 | or else Is_Access_Type (Typ)) | |
| 4606 | and then not Is_Imported (Ent) | |
| 4607 | then | |
| 4608 | if Nkind (Expr) = N_Attribute_Reference | |
| 4609 | and then Is_Entity_Name (Prefix (Expr)) | |
| 4610 | then | |
| 4611 | Old := Entity (Prefix (Expr)); | |
| 4612 | ||
| 4613 | elsif Is_Entity_Name (Expr) | |
| 4614 | and then Ekind (Entity (Expr)) = E_Constant | |
| 4615 | then | |
| 4616 | Decl := Declaration_Node (Entity (Expr)); | |
| 4617 | ||
| 4618 | if Nkind (Decl) = N_Object_Declaration | |
| 4619 | and then Present (Expression (Decl)) | |
| 4620 | and then Nkind (Expression (Decl)) = N_Attribute_Reference | |
| 4621 | and then Is_Entity_Name (Prefix (Expression (Decl))) | |
| 4622 | then | |
| 4623 | Old := Entity (Prefix (Expression (Decl))); | |
| 4624 | ||
| 4625 | elsif Nkind (Expr) = N_Function_Call then | |
| 4626 | return; | |
| 4627 | end if; | |
| 4628 | ||
| 4629 | -- A function call (most likely to To_Address) is probably not | |
| 4630 | -- an overlay, so skip warning. Ditto if the function call was | |
| 4631 | -- inlined and transformed into an entity. | |
| 4632 | ||
| 4633 | elsif Nkind (Original_Node (Expr)) = N_Function_Call then | |
| 4634 | return; | |
| 4635 | end if; | |
| 4636 | ||
| 4637 | Decl := Next (Parent (Expr)); | |
| 4638 | ||
| 4639 | -- If a pragma Import follows, we assume that it is for the current | |
| 4640 | -- target of the address clause, and skip the warning. | |
| 4641 | ||
| 4642 | if Present (Decl) | |
| 4643 | and then Nkind (Decl) = N_Pragma | |
| 4644 | and then Chars (Decl) = Name_Import | |
| 4645 | then | |
| 4646 | return; | |
| 4647 | end if; | |
| 4648 | ||
| 4649 | if Present (Old) then | |
| 4650 | Error_Msg_Node_2 := Old; | |
| 4651 | Error_Msg_N | |
| 4652 | ("default initialization of & may modify &?", | |
| 4653 | Nam); | |
| 4654 | else | |
| 4655 | Error_Msg_N | |
| 4656 | ("default initialization of & may modify overlaid storage?", | |
| 4657 | Nam); | |
| 4658 | end if; | |
| 4659 | ||
| 4660 | -- Add friendly warning if initialization comes from a packed array | |
| 4661 | -- component. | |
| 4662 | ||
| 4663 | if Is_Record_Type (Typ) then | |
| 4664 | declare | |
| 4665 | Comp : Entity_Id; | |
| 4666 | ||
| 4667 | begin | |
| 4668 | Comp := First_Component (Typ); | |
| 4669 | ||
| 4670 | while Present (Comp) loop | |
| 4671 | if Nkind (Parent (Comp)) = N_Component_Declaration | |
| 4672 | and then Present (Expression (Parent (Comp))) | |
| 4673 | then | |
| 4674 | exit; | |
| 4675 | elsif Is_Array_Type (Etype (Comp)) | |
| 4676 | and then Present (Packed_Array_Type (Etype (Comp))) | |
| 4677 | then | |
| 4678 | Error_Msg_NE | |
| 4679 | ("packed array component& will be initialized to zero?", | |
| 4680 | Nam, Comp); | |
| 4681 | exit; | |
| 4682 | else | |
| 4683 | Next_Component (Comp); | |
| 4684 | end if; | |
| 4685 | end loop; | |
| 4686 | end; | |
| 4687 | end if; | |
| 4688 | ||
| 4689 | Error_Msg_N | |
| 4690 | ("use pragma Import for & to " & | |
| 4691 | "suppress initialization ('R'M B.1(24))?", | |
| 4692 | Nam); | |
| 4693 | end if; | |
| 4694 | end Warn_Overlay; | |
| 4695 | ||
| 70482933 | 4696 | end Freeze; |