git://gcc.gnu.org / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| 19590d70 | 1 | ----------------------------------------------------------------------------- |
| 70482933 RK |
2 | -- -- |
| 3 | -- GNAT COMPILER COMPONENTS -- | |
| 4 | -- -- | |
| 5 | -- F R E E Z E -- | |
| 6 | -- -- | |
| 7 | -- B o d y -- | |
| 8 | -- -- | |
| 748086b7 | 9 | -- Copyright (C) 1992-2009, 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- -- | |
| 748086b7 | 13 | -- ware Foundation; either version 3, or (at your option) any later ver- -- |
| 70482933 RK |
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 -- | |
| 748086b7 JJ |
16 | -- or FITNESS FOR A PARTICULAR PURPOSE. -- |
| 17 | -- -- | |
| 18 | -- You should have received a copy of the GNU General Public License along -- | |
| 19 | -- with this program; see file COPYING3. If not see -- | |
| 20 | -- <http://www.gnu.org/licenses/>. -- | |
| 70482933 RK |
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; | |
| 1ce1f005 | 32 | with Exp_Ch3; use Exp_Ch3; |
| 70482933 | 33 | with Exp_Ch7; use Exp_Ch7; |
| ce2b6ba5 | 34 | with Exp_Disp; use Exp_Disp; |
| 70482933 RK |
35 | with Exp_Pakd; use Exp_Pakd; |
| 36 | with Exp_Util; use Exp_Util; | |
| fbf5a39b | 37 | with Exp_Tss; use Exp_Tss; |
| 70482933 | 38 | with Layout; use Layout; |
| 7d8b9c99 | 39 | with Namet; use Namet; |
| 70482933 RK |
40 | with Nlists; use Nlists; |
| 41 | with Nmake; use Nmake; | |
| 42 | with Opt; use Opt; | |
| 43 | with Restrict; use Restrict; | |
| 6e937c1c | 44 | with Rident; use Rident; |
| 70482933 | 45 | with Sem; use Sem; |
| a4100e55 | 46 | with Sem_Aux; use Sem_Aux; |
| 70482933 RK |
47 | with Sem_Cat; use Sem_Cat; |
| 48 | with Sem_Ch6; use Sem_Ch6; | |
| 49 | with Sem_Ch7; use Sem_Ch7; | |
| 50 | with Sem_Ch8; use Sem_Ch8; | |
| 51 | with Sem_Ch13; use Sem_Ch13; | |
| 52 | with Sem_Eval; use Sem_Eval; | |
| 53 | with Sem_Mech; use Sem_Mech; | |
| 54 | with Sem_Prag; use Sem_Prag; | |
| 55 | with Sem_Res; use Sem_Res; | |
| 56 | with Sem_Util; use Sem_Util; | |
| 57 | with Sinfo; use Sinfo; | |
| 58 | with Snames; use Snames; | |
| 59 | with Stand; use Stand; | |
| 60 | with Targparm; use Targparm; | |
| 61 | with Tbuild; use Tbuild; | |
| 62 | with Ttypes; use Ttypes; | |
| 63 | with Uintp; use Uintp; | |
| 64 | with Urealp; use Urealp; | |
| 65 | ||
| 66 | package body Freeze is | |
| 67 | ||
| 68 | ----------------------- | |
| 69 | -- Local Subprograms -- | |
| 70 | ----------------------- | |
| 71 | ||
| 72 | procedure Adjust_Esize_For_Alignment (Typ : Entity_Id); | |
| 73 | -- Typ is a type that is being frozen. If no size clause is given, | |
| 74 | -- but a default Esize has been computed, then this default Esize is | |
| 75 | -- adjusted up if necessary to be consistent with a given alignment, | |
| 76 | -- but never to a value greater than Long_Long_Integer'Size. This | |
| 77 | -- is used for all discrete types and for fixed-point types. | |
| 78 | ||
| 79 | procedure Build_And_Analyze_Renamed_Body | |
| 80 | (Decl : Node_Id; | |
| 81 | New_S : Entity_Id; | |
| 82 | After : in out Node_Id); | |
| 49e90211 | 83 | -- Build body for a renaming declaration, insert in tree and analyze |
| 70482933 | 84 | |
| fbf5a39b AC |
85 | procedure Check_Address_Clause (E : Entity_Id); |
| 86 | -- Apply legality checks to address clauses for object declarations, | |
| 2c9beb8a | 87 | -- at the point the object is frozen. |
| fbf5a39b | 88 | |
| 70482933 RK |
89 | procedure Check_Strict_Alignment (E : Entity_Id); |
| 90 | -- E is a base type. If E is tagged or has a component that is aliased | |
| 91 | -- or tagged or contains something this is aliased or tagged, set | |
| 92 | -- Strict_Alignment. | |
| 93 | ||
| 94 | procedure Check_Unsigned_Type (E : Entity_Id); | |
| 95 | pragma Inline (Check_Unsigned_Type); | |
| 96 | -- If E is a fixed-point or discrete type, then all the necessary work | |
| 97 | -- to freeze it is completed except for possible setting of the flag | |
| 98 | -- Is_Unsigned_Type, which is done by this procedure. The call has no | |
| 99 | -- effect if the entity E is not a discrete or fixed-point type. | |
| 100 | ||
| 101 | procedure Freeze_And_Append | |
| 102 | (Ent : Entity_Id; | |
| 103 | Loc : Source_Ptr; | |
| 104 | Result : in out List_Id); | |
| 105 | -- Freezes Ent using Freeze_Entity, and appends the resulting list of | |
| 106 | -- nodes to Result, modifying Result from No_List if necessary. | |
| 107 | ||
| 108 | procedure Freeze_Enumeration_Type (Typ : Entity_Id); | |
| 109 | -- Freeze enumeration type. The Esize field is set as processing | |
| 110 | -- proceeds (i.e. set by default when the type is declared and then | |
| 111 | -- adjusted by rep clauses. What this procedure does is to make sure | |
| 112 | -- that if a foreign convention is specified, and no specific size | |
| 113 | -- is given, then the size must be at least Integer'Size. | |
| 114 | ||
| 70482933 RK |
115 | procedure Freeze_Static_Object (E : Entity_Id); |
| 116 | -- If an object is frozen which has Is_Statically_Allocated set, then | |
| 117 | -- all referenced types must also be marked with this flag. This routine | |
| 118 | -- is in charge of meeting this requirement for the object entity E. | |
| 119 | ||
| 120 | procedure Freeze_Subprogram (E : Entity_Id); | |
| 121 | -- Perform freezing actions for a subprogram (create extra formals, | |
| 122 | -- and set proper default mechanism values). Note that this routine | |
| 123 | -- is not called for internal subprograms, for which neither of these | |
| 124 | -- actions is needed (or desirable, we do not want for example to have | |
| 125 | -- these extra formals present in initialization procedures, where they | |
| 126 | -- would serve no purpose). In this call E is either a subprogram or | |
| 127 | -- a subprogram type (i.e. an access to a subprogram). | |
| 128 | ||
| 129 | function Is_Fully_Defined (T : Entity_Id) return Boolean; | |
| bde58e32 | 130 | -- True if T is not private and has no private components, or has a full |
| 657a9dd9 AC |
131 | -- view. Used to determine whether the designated type of an access type |
| 132 | -- should be frozen when the access type is frozen. This is done when an | |
| 133 | -- allocator is frozen, or an expression that may involve attributes of | |
| 134 | -- the designated type. Otherwise freezing the access type does not freeze | |
| 135 | -- the designated type. | |
| 70482933 RK |
136 | |
| 137 | procedure Process_Default_Expressions | |
| 138 | (E : Entity_Id; | |
| 139 | After : in out Node_Id); | |
| 140 | -- This procedure is called for each subprogram to complete processing | |
| 141 | -- of default expressions at the point where all types are known to be | |
| 142 | -- frozen. The expressions must be analyzed in full, to make sure that | |
| 143 | -- all error processing is done (they have only been pre-analyzed). If | |
| 144 | -- the expression is not an entity or literal, its analysis may generate | |
| 145 | -- code which must not be executed. In that case we build a function | |
| 146 | -- body to hold that code. This wrapper function serves no other purpose | |
| 147 | -- (it used to be called to evaluate the default, but now the default is | |
| 148 | -- inlined at each point of call). | |
| 149 | ||
| 150 | procedure Set_Component_Alignment_If_Not_Set (Typ : Entity_Id); | |
| 151 | -- Typ is a record or array type that is being frozen. This routine | |
| 152 | -- sets the default component alignment from the scope stack values | |
| 153 | -- if the alignment is otherwise not specified. | |
| 154 | ||
| 155 | procedure Check_Debug_Info_Needed (T : Entity_Id); | |
| 156 | -- As each entity is frozen, this routine is called to deal with the | |
| 157 | -- setting of Debug_Info_Needed for the entity. This flag is set if | |
| 158 | -- the entity comes from source, or if we are in Debug_Generated_Code | |
| 159 | -- mode or if the -gnatdV debug flag is set. However, it never sets | |
| 1b24ada5 RD |
160 | -- the flag if Debug_Info_Off is set. This procedure also ensures that |
| 161 | -- subsidiary entities have the flag set as required. | |
| 70482933 | 162 | |
| c6823a20 EB |
163 | procedure Undelay_Type (T : Entity_Id); |
| 164 | -- T is a type of a component that we know to be an Itype. | |
| 165 | -- We don't want this to have a Freeze_Node, so ensure it doesn't. | |
| 166 | -- Do the same for any Full_View or Corresponding_Record_Type. | |
| 167 | ||
| fbf5a39b AC |
168 | procedure Warn_Overlay |
| 169 | (Expr : Node_Id; | |
| 170 | Typ : Entity_Id; | |
| 171 | Nam : Node_Id); | |
| 172 | -- Expr is the expression for an address clause for entity Nam whose type | |
| 173 | -- is Typ. If Typ has a default initialization, and there is no explicit | |
| 174 | -- initialization in the source declaration, check whether the address | |
| 175 | -- clause might cause overlaying of an entity, and emit a warning on the | |
| 176 | -- side effect that the initialization will cause. | |
| 177 | ||
| 70482933 RK |
178 | ------------------------------- |
| 179 | -- Adjust_Esize_For_Alignment -- | |
| 180 | ------------------------------- | |
| 181 | ||
| 182 | procedure Adjust_Esize_For_Alignment (Typ : Entity_Id) is | |
| 183 | Align : Uint; | |
| 184 | ||
| 185 | begin | |
| 186 | if Known_Esize (Typ) and then Known_Alignment (Typ) then | |
| 187 | Align := Alignment_In_Bits (Typ); | |
| 188 | ||
| 189 | if Align > Esize (Typ) | |
| 190 | and then Align <= Standard_Long_Long_Integer_Size | |
| 191 | then | |
| 192 | Set_Esize (Typ, Align); | |
| 193 | end if; | |
| 194 | end if; | |
| 195 | end Adjust_Esize_For_Alignment; | |
| 196 | ||
| 197 | ------------------------------------ | |
| 198 | -- Build_And_Analyze_Renamed_Body -- | |
| 199 | ------------------------------------ | |
| 200 | ||
| 201 | procedure Build_And_Analyze_Renamed_Body | |
| 202 | (Decl : Node_Id; | |
| 203 | New_S : Entity_Id; | |
| 204 | After : in out Node_Id) | |
| 205 | is | |
| 206 | Body_Node : constant Node_Id := Build_Renamed_Body (Decl, New_S); | |
| 70482933 RK |
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 | ||
| def46b54 RD |
242 | Pref : Node_Id := Empty; |
| 243 | -- If the renamed entity is a primitive operation given in prefix form, | |
| 244 | -- the prefix is the target object and it has to be added as the first | |
| 245 | -- actual in the generated call. | |
| 246 | ||
| 70482933 | 247 | begin |
| def46b54 RD |
248 | -- Determine the entity being renamed, which is the target of the call |
| 249 | -- statement. If the name is an explicit dereference, this is a renaming | |
| 250 | -- of a subprogram type rather than a subprogram. The name itself is | |
| 251 | -- fully analyzed. | |
| 70482933 RK |
252 | |
| 253 | if Nkind (Nam) = N_Selected_Component then | |
| 254 | Old_S := Entity (Selector_Name (Nam)); | |
| 255 | ||
| 256 | elsif Nkind (Nam) = N_Explicit_Dereference then | |
| 257 | Old_S := Etype (Nam); | |
| 258 | ||
| 259 | elsif Nkind (Nam) = N_Indexed_Component then | |
| 70482933 RK |
260 | if Is_Entity_Name (Prefix (Nam)) then |
| 261 | Old_S := Entity (Prefix (Nam)); | |
| 262 | else | |
| 263 | Old_S := Entity (Selector_Name (Prefix (Nam))); | |
| 264 | end if; | |
| 265 | ||
| 266 | elsif Nkind (Nam) = N_Character_Literal then | |
| 267 | Old_S := Etype (New_S); | |
| 268 | ||
| 269 | else | |
| 270 | Old_S := Entity (Nam); | |
| 271 | end if; | |
| 272 | ||
| 273 | if Is_Entity_Name (Nam) then | |
| 07fc65c4 | 274 | |
| def46b54 RD |
275 | -- If the renamed entity is a predefined operator, retain full name |
| 276 | -- to ensure its visibility. | |
| 07fc65c4 GB |
277 | |
| 278 | if Ekind (Old_S) = E_Operator | |
| 279 | and then Nkind (Nam) = N_Expanded_Name | |
| 280 | then | |
| 281 | Call_Name := New_Copy (Name (N)); | |
| 282 | else | |
| 283 | Call_Name := New_Reference_To (Old_S, Loc); | |
| 284 | end if; | |
| 285 | ||
| 70482933 | 286 | else |
| def46b54 RD |
287 | if Nkind (Nam) = N_Selected_Component |
| 288 | and then Present (First_Formal (Old_S)) | |
| 289 | and then | |
| 290 | (Is_Controlling_Formal (First_Formal (Old_S)) | |
| 291 | or else Is_Class_Wide_Type (Etype (First_Formal (Old_S)))) | |
| 292 | then | |
| 293 | ||
| 294 | -- Retrieve the target object, to be added as a first actual | |
| 295 | -- in the call. | |
| 296 | ||
| 297 | Call_Name := New_Occurrence_Of (Old_S, Loc); | |
| 298 | Pref := Prefix (Nam); | |
| 299 | ||
| 300 | else | |
| 301 | Call_Name := New_Copy (Name (N)); | |
| 302 | end if; | |
| 70482933 RK |
303 | |
| 304 | -- The original name may have been overloaded, but | |
| 305 | -- is fully resolved now. | |
| 306 | ||
| 307 | Set_Is_Overloaded (Call_Name, False); | |
| 308 | end if; | |
| 309 | ||
| def46b54 RD |
310 | -- For simple renamings, subsequent calls can be expanded directly as |
| 311 | -- called to the renamed entity. The body must be generated in any case | |
| 312 | -- for calls they may appear elsewhere. | |
| 70482933 RK |
313 | |
| 314 | if (Ekind (Old_S) = E_Function | |
| 315 | or else Ekind (Old_S) = E_Procedure) | |
| 316 | and then Nkind (Decl) = N_Subprogram_Declaration | |
| 317 | then | |
| 318 | Set_Body_To_Inline (Decl, Old_S); | |
| 319 | end if; | |
| 320 | ||
| 321 | -- The body generated for this renaming is an internal artifact, and | |
| 322 | -- does not constitute a freeze point for the called entity. | |
| 323 | ||
| 324 | Set_Must_Not_Freeze (Call_Name); | |
| 325 | ||
| 326 | Formal := First_Formal (Defining_Entity (Decl)); | |
| 327 | ||
| def46b54 RD |
328 | if Present (Pref) then |
| 329 | declare | |
| 330 | Pref_Type : constant Entity_Id := Etype (Pref); | |
| 331 | Form_Type : constant Entity_Id := Etype (First_Formal (Old_S)); | |
| 332 | ||
| 333 | begin | |
| 334 | ||
| 335 | -- The controlling formal may be an access parameter, or the | |
| e14c931f | 336 | -- actual may be an access value, so adjust accordingly. |
| def46b54 RD |
337 | |
| 338 | if Is_Access_Type (Pref_Type) | |
| 339 | and then not Is_Access_Type (Form_Type) | |
| 340 | then | |
| 341 | Actuals := New_List | |
| 342 | (Make_Explicit_Dereference (Loc, Relocate_Node (Pref))); | |
| 343 | ||
| 344 | elsif Is_Access_Type (Form_Type) | |
| 345 | and then not Is_Access_Type (Pref) | |
| 346 | then | |
| 347 | Actuals := New_List | |
| 348 | (Make_Attribute_Reference (Loc, | |
| 349 | Attribute_Name => Name_Access, | |
| 350 | Prefix => Relocate_Node (Pref))); | |
| 351 | else | |
| 352 | Actuals := New_List (Pref); | |
| 353 | end if; | |
| 354 | end; | |
| 355 | ||
| 356 | elsif Present (Formal) then | |
| 70482933 RK |
357 | Actuals := New_List; |
| 358 | ||
| def46b54 RD |
359 | else |
| 360 | Actuals := No_List; | |
| 361 | end if; | |
| 362 | ||
| 363 | if Present (Formal) then | |
| 70482933 RK |
364 | while Present (Formal) loop |
| 365 | Append (New_Reference_To (Formal, Loc), Actuals); | |
| 366 | Next_Formal (Formal); | |
| 367 | end loop; | |
| 368 | end if; | |
| 369 | ||
| def46b54 RD |
370 | -- If the renamed entity is an entry, inherit its profile. For other |
| 371 | -- renamings as bodies, both profiles must be subtype conformant, so it | |
| 372 | -- is not necessary to replace the profile given in the declaration. | |
| 373 | -- However, default values that are aggregates are rewritten when | |
| 374 | -- partially analyzed, so we recover the original aggregate to insure | |
| 375 | -- that subsequent conformity checking works. Similarly, if the default | |
| 376 | -- expression was constant-folded, recover the original expression. | |
| 70482933 RK |
377 | |
| 378 | Formal := First_Formal (Defining_Entity (Decl)); | |
| 379 | ||
| 380 | if Present (Formal) then | |
| 381 | O_Formal := First_Formal (Old_S); | |
| 382 | Param_Spec := First (Parameter_Specifications (Spec)); | |
| 383 | ||
| 384 | while Present (Formal) loop | |
| 385 | if Is_Entry (Old_S) then | |
| 386 | ||
| 387 | if Nkind (Parameter_Type (Param_Spec)) /= | |
| 388 | N_Access_Definition | |
| 389 | then | |
| 390 | Set_Etype (Formal, Etype (O_Formal)); | |
| 391 | Set_Entity (Parameter_Type (Param_Spec), Etype (O_Formal)); | |
| 392 | end if; | |
| 393 | ||
| 07fc65c4 GB |
394 | elsif Nkind (Default_Value (O_Formal)) = N_Aggregate |
| 395 | or else Nkind (Original_Node (Default_Value (O_Formal))) /= | |
| 396 | Nkind (Default_Value (O_Formal)) | |
| 397 | then | |
| 70482933 RK |
398 | Set_Expression (Param_Spec, |
| 399 | New_Copy_Tree (Original_Node (Default_Value (O_Formal)))); | |
| 400 | end if; | |
| 401 | ||
| 402 | Next_Formal (Formal); | |
| 403 | Next_Formal (O_Formal); | |
| 404 | Next (Param_Spec); | |
| 405 | end loop; | |
| 406 | end if; | |
| 407 | ||
| 408 | -- If the renamed entity is a function, the generated body contains a | |
| 409 | -- return statement. Otherwise, build a procedure call. If the entity is | |
| 410 | -- an entry, subsequent analysis of the call will transform it into the | |
| 411 | -- proper entry or protected operation call. If the renamed entity is | |
| 412 | -- a character literal, return it directly. | |
| 413 | ||
| 414 | if Ekind (Old_S) = E_Function | |
| 415 | or else Ekind (Old_S) = E_Operator | |
| 416 | or else (Ekind (Old_S) = E_Subprogram_Type | |
| 417 | and then Etype (Old_S) /= Standard_Void_Type) | |
| 418 | then | |
| 419 | Call_Node := | |
| 86cde7b1 | 420 | Make_Simple_Return_Statement (Loc, |
| 70482933 RK |
421 | Expression => |
| 422 | Make_Function_Call (Loc, | |
| 423 | Name => Call_Name, | |
| 424 | Parameter_Associations => Actuals)); | |
| 425 | ||
| 426 | elsif Ekind (Old_S) = E_Enumeration_Literal then | |
| 427 | Call_Node := | |
| 86cde7b1 | 428 | Make_Simple_Return_Statement (Loc, |
| 70482933 RK |
429 | Expression => New_Occurrence_Of (Old_S, Loc)); |
| 430 | ||
| 431 | elsif Nkind (Nam) = N_Character_Literal then | |
| 432 | Call_Node := | |
| 86cde7b1 | 433 | Make_Simple_Return_Statement (Loc, |
| 70482933 RK |
434 | Expression => Call_Name); |
| 435 | ||
| 436 | else | |
| 437 | Call_Node := | |
| 438 | Make_Procedure_Call_Statement (Loc, | |
| 439 | Name => Call_Name, | |
| 440 | Parameter_Associations => Actuals); | |
| 441 | end if; | |
| 442 | ||
| 49e90211 | 443 | -- Create entities for subprogram body and formals |
| 70482933 RK |
444 | |
| 445 | Set_Defining_Unit_Name (Spec, | |
| 446 | Make_Defining_Identifier (Loc, Chars => Chars (New_S))); | |
| 447 | ||
| 448 | Param_Spec := First (Parameter_Specifications (Spec)); | |
| 449 | ||
| 450 | while Present (Param_Spec) loop | |
| 451 | Set_Defining_Identifier (Param_Spec, | |
| 452 | Make_Defining_Identifier (Loc, | |
| 453 | Chars => Chars (Defining_Identifier (Param_Spec)))); | |
| 454 | Next (Param_Spec); | |
| 455 | end loop; | |
| 456 | ||
| 457 | Body_Node := | |
| 458 | Make_Subprogram_Body (Loc, | |
| 459 | Specification => Spec, | |
| 460 | Declarations => New_List, | |
| 461 | Handled_Statement_Sequence => | |
| 462 | Make_Handled_Sequence_Of_Statements (Loc, | |
| 463 | Statements => New_List (Call_Node))); | |
| 464 | ||
| 465 | if Nkind (Decl) /= N_Subprogram_Declaration then | |
| 466 | Rewrite (N, | |
| 467 | Make_Subprogram_Declaration (Loc, | |
| 468 | Specification => Specification (N))); | |
| 469 | end if; | |
| 470 | ||
| 471 | -- Link the body to the entity whose declaration it completes. If | |
| def46b54 RD |
472 | -- the body is analyzed when the renamed entity is frozen, it may |
| 473 | -- be necessary to restore the proper scope (see package Exp_Ch13). | |
| 70482933 RK |
474 | |
| 475 | if Nkind (N) = N_Subprogram_Renaming_Declaration | |
| 476 | and then Present (Corresponding_Spec (N)) | |
| 477 | then | |
| 478 | Set_Corresponding_Spec (Body_Node, Corresponding_Spec (N)); | |
| 479 | else | |
| 480 | Set_Corresponding_Spec (Body_Node, New_S); | |
| 481 | end if; | |
| 482 | ||
| 483 | return Body_Node; | |
| 484 | end Build_Renamed_Body; | |
| 485 | ||
| fbf5a39b AC |
486 | -------------------------- |
| 487 | -- Check_Address_Clause -- | |
| 488 | -------------------------- | |
| 489 | ||
| 490 | procedure Check_Address_Clause (E : Entity_Id) is | |
| 491 | Addr : constant Node_Id := Address_Clause (E); | |
| 492 | Expr : Node_Id; | |
| 493 | Decl : constant Node_Id := Declaration_Node (E); | |
| 494 | Typ : constant Entity_Id := Etype (E); | |
| 495 | ||
| 496 | begin | |
| 497 | if Present (Addr) then | |
| 498 | Expr := Expression (Addr); | |
| 499 | ||
| def46b54 RD |
500 | -- If we have no initialization of any kind, then we don't need to |
| 501 | -- place any restrictions on the address clause, because the object | |
| 502 | -- will be elaborated after the address clause is evaluated. This | |
| 503 | -- happens if the declaration has no initial expression, or the type | |
| 504 | -- has no implicit initialization, or the object is imported. | |
| fbf5a39b | 505 | |
| def46b54 RD |
506 | -- The same holds for all initialized scalar types and all access |
| 507 | -- types. Packed bit arrays of size up to 64 are represented using a | |
| 508 | -- modular type with an initialization (to zero) and can be processed | |
| 509 | -- like other initialized scalar types. | |
| fbf5a39b AC |
510 | |
| 511 | -- If the type is controlled, code to attach the object to a | |
| 512 | -- finalization chain is generated at the point of declaration, | |
| 513 | -- and therefore the elaboration of the object cannot be delayed: | |
| 514 | -- the address expression must be a constant. | |
| 515 | ||
| 516 | if (No (Expression (Decl)) | |
| 048e5cef | 517 | and then not Needs_Finalization (Typ) |
| fbf5a39b AC |
518 | and then |
| 519 | (not Has_Non_Null_Base_Init_Proc (Typ) | |
| 520 | or else Is_Imported (E))) | |
| 521 | ||
| 522 | or else | |
| 523 | (Present (Expression (Decl)) | |
| 524 | and then Is_Scalar_Type (Typ)) | |
| 525 | ||
| 526 | or else | |
| 527 | Is_Access_Type (Typ) | |
| 528 | ||
| 529 | or else | |
| 530 | (Is_Bit_Packed_Array (Typ) | |
| 531 | and then | |
| 532 | Is_Modular_Integer_Type (Packed_Array_Type (Typ))) | |
| 533 | then | |
| 534 | null; | |
| 535 | ||
| def46b54 RD |
536 | -- Otherwise, we require the address clause to be constant because |
| 537 | -- the call to the initialization procedure (or the attach code) has | |
| 538 | -- to happen at the point of the declaration. | |
| fbf5a39b AC |
539 | |
| 540 | else | |
| 541 | Check_Constant_Address_Clause (Expr, E); | |
| 542 | Set_Has_Delayed_Freeze (E, False); | |
| 543 | end if; | |
| 544 | ||
| 545 | if not Error_Posted (Expr) | |
| 048e5cef | 546 | and then not Needs_Finalization (Typ) |
| fbf5a39b AC |
547 | then |
| 548 | Warn_Overlay (Expr, Typ, Name (Addr)); | |
| 549 | end if; | |
| 550 | end if; | |
| 551 | end Check_Address_Clause; | |
| 552 | ||
| 70482933 RK |
553 | ----------------------------- |
| 554 | -- Check_Compile_Time_Size -- | |
| 555 | ----------------------------- | |
| 556 | ||
| 557 | procedure Check_Compile_Time_Size (T : Entity_Id) is | |
| 558 | ||
| c6823a20 | 559 | procedure Set_Small_Size (T : Entity_Id; S : Uint); |
| 70482933 | 560 | -- Sets the compile time known size (32 bits or less) in the Esize |
| c6823a20 | 561 | -- field, of T checking for a size clause that was given which attempts |
| 70482933 RK |
562 | -- to give a smaller size. |
| 563 | ||
| 564 | function Size_Known (T : Entity_Id) return Boolean; | |
| 07fc65c4 | 565 | -- Recursive function that does all the work |
| 70482933 RK |
566 | |
| 567 | function Static_Discriminated_Components (T : Entity_Id) return Boolean; | |
| 568 | -- If T is a constrained subtype, its size is not known if any of its | |
| 569 | -- discriminant constraints is not static and it is not a null record. | |
| fbf5a39b | 570 | -- The test is conservative and doesn't check that the components are |
| 70482933 RK |
571 | -- in fact constrained by non-static discriminant values. Could be made |
| 572 | -- more precise ??? | |
| 573 | ||
| 574 | -------------------- | |
| 575 | -- Set_Small_Size -- | |
| 576 | -------------------- | |
| 577 | ||
| c6823a20 | 578 | procedure Set_Small_Size (T : Entity_Id; S : Uint) is |
| 70482933 RK |
579 | begin |
| 580 | if S > 32 then | |
| 581 | return; | |
| 582 | ||
| 583 | elsif Has_Size_Clause (T) then | |
| 584 | if RM_Size (T) < S then | |
| 585 | Error_Msg_Uint_1 := S; | |
| 586 | Error_Msg_NE | |
| 7d8b9c99 | 587 | ("size for & too small, minimum allowed is ^", |
| 70482933 RK |
588 | Size_Clause (T), T); |
| 589 | ||
| 590 | elsif Unknown_Esize (T) then | |
| 591 | Set_Esize (T, S); | |
| 592 | end if; | |
| 593 | ||
| 594 | -- Set sizes if not set already | |
| 595 | ||
| 596 | else | |
| 597 | if Unknown_Esize (T) then | |
| 598 | Set_Esize (T, S); | |
| 599 | end if; | |
| 600 | ||
| 601 | if Unknown_RM_Size (T) then | |
| 602 | Set_RM_Size (T, S); | |
| 603 | end if; | |
| 604 | end if; | |
| 605 | end Set_Small_Size; | |
| 606 | ||
| 607 | ---------------- | |
| 608 | -- Size_Known -- | |
| 609 | ---------------- | |
| 610 | ||
| 611 | function Size_Known (T : Entity_Id) return Boolean is | |
| 612 | Index : Entity_Id; | |
| 613 | Comp : Entity_Id; | |
| 614 | Ctyp : Entity_Id; | |
| 615 | Low : Node_Id; | |
| 616 | High : Node_Id; | |
| 617 | ||
| 618 | begin | |
| 619 | if Size_Known_At_Compile_Time (T) then | |
| 620 | return True; | |
| 621 | ||
| c6a9797e RD |
622 | -- Always True for scalar types. This is true even for generic formal |
| 623 | -- scalar types. We used to return False in the latter case, but the | |
| 624 | -- size is known at compile time, even in the template, we just do | |
| 625 | -- not know the exact size but that's not the point of this routine. | |
| 626 | ||
| 70482933 RK |
627 | elsif Is_Scalar_Type (T) |
| 628 | or else Is_Task_Type (T) | |
| 629 | then | |
| c6a9797e RD |
630 | return True; |
| 631 | ||
| 632 | -- Array types | |
| 70482933 RK |
633 | |
| 634 | elsif Is_Array_Type (T) then | |
| c6a9797e RD |
635 | |
| 636 | -- String literals always have known size, and we can set it | |
| 637 | ||
| 70482933 | 638 | if Ekind (T) = E_String_Literal_Subtype then |
| c6823a20 EB |
639 | Set_Small_Size (T, Component_Size (T) |
| 640 | * String_Literal_Length (T)); | |
| 70482933 RK |
641 | return True; |
| 642 | ||
| c6a9797e RD |
643 | -- Unconstrained types never have known at compile time size |
| 644 | ||
| 70482933 RK |
645 | elsif not Is_Constrained (T) then |
| 646 | return False; | |
| 647 | ||
| def46b54 RD |
648 | -- Don't do any recursion on type with error posted, since we may |
| 649 | -- have a malformed type that leads us into a loop. | |
| 07fc65c4 GB |
650 | |
| 651 | elsif Error_Posted (T) then | |
| 652 | return False; | |
| 653 | ||
| c6a9797e RD |
654 | -- Otherwise if component size unknown, then array size unknown |
| 655 | ||
| 70482933 RK |
656 | elsif not Size_Known (Component_Type (T)) then |
| 657 | return False; | |
| 658 | end if; | |
| 659 | ||
| def46b54 RD |
660 | -- Check for all indexes static, and also compute possible size |
| 661 | -- (in case it is less than 32 and may be packable). | |
| 70482933 RK |
662 | |
| 663 | declare | |
| 664 | Esiz : Uint := Component_Size (T); | |
| 665 | Dim : Uint; | |
| 666 | ||
| 667 | begin | |
| 668 | Index := First_Index (T); | |
| 70482933 RK |
669 | while Present (Index) loop |
| 670 | if Nkind (Index) = N_Range then | |
| 671 | Get_Index_Bounds (Index, Low, High); | |
| 672 | ||
| 673 | elsif Error_Posted (Scalar_Range (Etype (Index))) then | |
| 674 | return False; | |
| 675 | ||
| 676 | else | |
| 677 | Low := Type_Low_Bound (Etype (Index)); | |
| 678 | High := Type_High_Bound (Etype (Index)); | |
| 679 | end if; | |
| 680 | ||
| 681 | if not Compile_Time_Known_Value (Low) | |
| 682 | or else not Compile_Time_Known_Value (High) | |
| 683 | or else Etype (Index) = Any_Type | |
| 684 | then | |
| 685 | return False; | |
| 686 | ||
| 687 | else | |
| 688 | Dim := Expr_Value (High) - Expr_Value (Low) + 1; | |
| 689 | ||
| 690 | if Dim >= 0 then | |
| 691 | Esiz := Esiz * Dim; | |
| 692 | else | |
| 693 | Esiz := Uint_0; | |
| 694 | end if; | |
| 695 | end if; | |
| 696 | ||
| 697 | Next_Index (Index); | |
| 698 | end loop; | |
| 699 | ||
| c6823a20 | 700 | Set_Small_Size (T, Esiz); |
| 70482933 RK |
701 | return True; |
| 702 | end; | |
| 703 | ||
| c6a9797e RD |
704 | -- Access types always have known at compile time sizes |
| 705 | ||
| 70482933 RK |
706 | elsif Is_Access_Type (T) then |
| 707 | return True; | |
| 708 | ||
| c6a9797e RD |
709 | -- For non-generic private types, go to underlying type if present |
| 710 | ||
| 70482933 RK |
711 | elsif Is_Private_Type (T) |
| 712 | and then not Is_Generic_Type (T) | |
| 713 | and then Present (Underlying_Type (T)) | |
| 714 | then | |
| def46b54 RD |
715 | -- Don't do any recursion on type with error posted, since we may |
| 716 | -- have a malformed type that leads us into a loop. | |
| 07fc65c4 GB |
717 | |
| 718 | if Error_Posted (T) then | |
| 719 | return False; | |
| 720 | else | |
| 721 | return Size_Known (Underlying_Type (T)); | |
| 722 | end if; | |
| 70482933 | 723 | |
| c6a9797e RD |
724 | -- Record types |
| 725 | ||
| 70482933 | 726 | elsif Is_Record_Type (T) then |
| fbf5a39b AC |
727 | |
| 728 | -- A class-wide type is never considered to have a known size | |
| 729 | ||
| 70482933 RK |
730 | if Is_Class_Wide_Type (T) then |
| 731 | return False; | |
| 732 | ||
| fbf5a39b AC |
733 | -- A subtype of a variant record must not have non-static |
| 734 | -- discriminanted components. | |
| 735 | ||
| 736 | elsif T /= Base_Type (T) | |
| 737 | and then not Static_Discriminated_Components (T) | |
| 738 | then | |
| 739 | return False; | |
| 70482933 | 740 | |
| def46b54 RD |
741 | -- Don't do any recursion on type with error posted, since we may |
| 742 | -- have a malformed type that leads us into a loop. | |
| 07fc65c4 GB |
743 | |
| 744 | elsif Error_Posted (T) then | |
| 745 | return False; | |
| fbf5a39b | 746 | end if; |
| 07fc65c4 | 747 | |
| fbf5a39b | 748 | -- Now look at the components of the record |
| 70482933 | 749 | |
| fbf5a39b | 750 | declare |
| def46b54 RD |
751 | -- The following two variables are used to keep track of the |
| 752 | -- size of packed records if we can tell the size of the packed | |
| 753 | -- record in the front end. Packed_Size_Known is True if so far | |
| 754 | -- we can figure out the size. It is initialized to True for a | |
| 755 | -- packed record, unless the record has discriminants. The | |
| 756 | -- reason we eliminate the discriminated case is that we don't | |
| 757 | -- know the way the back end lays out discriminated packed | |
| 758 | -- records. If Packed_Size_Known is True, then Packed_Size is | |
| 759 | -- the size in bits so far. | |
| fbf5a39b AC |
760 | |
| 761 | Packed_Size_Known : Boolean := | |
| 762 | Is_Packed (T) | |
| 763 | and then not Has_Discriminants (T); | |
| 764 | ||
| 765 | Packed_Size : Uint := Uint_0; | |
| 766 | ||
| 767 | begin | |
| 768 | -- Test for variant part present | |
| 769 | ||
| 770 | if Has_Discriminants (T) | |
| 771 | and then Present (Parent (T)) | |
| 772 | and then Nkind (Parent (T)) = N_Full_Type_Declaration | |
| 773 | and then Nkind (Type_Definition (Parent (T))) = | |
| 774 | N_Record_Definition | |
| 775 | and then not Null_Present (Type_Definition (Parent (T))) | |
| 776 | and then Present (Variant_Part | |
| 777 | (Component_List (Type_Definition (Parent (T))))) | |
| 778 | then | |
| 779 | -- If variant part is present, and type is unconstrained, | |
| 780 | -- then we must have defaulted discriminants, or a size | |
| 781 | -- clause must be present for the type, or else the size | |
| 782 | -- is definitely not known at compile time. | |
| 783 | ||
| 784 | if not Is_Constrained (T) | |
| 785 | and then | |
| 786 | No (Discriminant_Default_Value | |
| 787 | (First_Discriminant (T))) | |
| 788 | and then Unknown_Esize (T) | |
| 70482933 | 789 | then |
| fbf5a39b AC |
790 | return False; |
| 791 | end if; | |
| 792 | end if; | |
| 70482933 | 793 | |
| fbf5a39b AC |
794 | -- Loop through components |
| 795 | ||
| fea9e956 | 796 | Comp := First_Component_Or_Discriminant (T); |
| fbf5a39b | 797 | while Present (Comp) loop |
| fea9e956 | 798 | Ctyp := Etype (Comp); |
| fbf5a39b | 799 | |
| fea9e956 ES |
800 | -- We do not know the packed size if there is a component |
| 801 | -- clause present (we possibly could, but this would only | |
| 802 | -- help in the case of a record with partial rep clauses. | |
| 803 | -- That's because in the case of full rep clauses, the | |
| 804 | -- size gets figured out anyway by a different circuit). | |
| fbf5a39b | 805 | |
| fea9e956 ES |
806 | if Present (Component_Clause (Comp)) then |
| 807 | Packed_Size_Known := False; | |
| 808 | end if; | |
| 70482933 | 809 | |
| fea9e956 ES |
810 | -- We need to identify a component that is an array where |
| 811 | -- the index type is an enumeration type with non-standard | |
| 812 | -- representation, and some bound of the type depends on a | |
| 813 | -- discriminant. | |
| 70482933 | 814 | |
| fea9e956 | 815 | -- This is because gigi computes the size by doing a |
| e14c931f | 816 | -- substitution of the appropriate discriminant value in |
| fea9e956 ES |
817 | -- the size expression for the base type, and gigi is not |
| 818 | -- clever enough to evaluate the resulting expression (which | |
| 819 | -- involves a call to rep_to_pos) at compile time. | |
| fbf5a39b | 820 | |
| fea9e956 ES |
821 | -- It would be nice if gigi would either recognize that |
| 822 | -- this expression can be computed at compile time, or | |
| 823 | -- alternatively figured out the size from the subtype | |
| 824 | -- directly, where all the information is at hand ??? | |
| fbf5a39b | 825 | |
| fea9e956 ES |
826 | if Is_Array_Type (Etype (Comp)) |
| 827 | and then Present (Packed_Array_Type (Etype (Comp))) | |
| 828 | then | |
| 829 | declare | |
| 830 | Ocomp : constant Entity_Id := | |
| 831 | Original_Record_Component (Comp); | |
| 832 | OCtyp : constant Entity_Id := Etype (Ocomp); | |
| 833 | Ind : Node_Id; | |
| 834 | Indtyp : Entity_Id; | |
| 835 | Lo, Hi : Node_Id; | |
| 70482933 | 836 | |
| fea9e956 ES |
837 | begin |
| 838 | Ind := First_Index (OCtyp); | |
| 839 | while Present (Ind) loop | |
| 840 | Indtyp := Etype (Ind); | |
| 70482933 | 841 | |
| fea9e956 ES |
842 | if Is_Enumeration_Type (Indtyp) |
| 843 | and then Has_Non_Standard_Rep (Indtyp) | |
| 844 | then | |
| 845 | Lo := Type_Low_Bound (Indtyp); | |
| 846 | Hi := Type_High_Bound (Indtyp); | |
| fbf5a39b | 847 | |
| fea9e956 ES |
848 | if Is_Entity_Name (Lo) |
| 849 | and then Ekind (Entity (Lo)) = E_Discriminant | |
| 850 | then | |
| 851 | return False; | |
| fbf5a39b | 852 | |
| fea9e956 ES |
853 | elsif Is_Entity_Name (Hi) |
| 854 | and then Ekind (Entity (Hi)) = E_Discriminant | |
| 855 | then | |
| 856 | return False; | |
| 857 | end if; | |
| 858 | end if; | |
| fbf5a39b | 859 | |
| fea9e956 ES |
860 | Next_Index (Ind); |
| 861 | end loop; | |
| 862 | end; | |
| 863 | end if; | |
| 70482933 | 864 | |
| def46b54 RD |
865 | -- Clearly size of record is not known if the size of one of |
| 866 | -- the components is not known. | |
| 70482933 | 867 | |
| fea9e956 ES |
868 | if not Size_Known (Ctyp) then |
| 869 | return False; | |
| 870 | end if; | |
| 70482933 | 871 | |
| fea9e956 | 872 | -- Accumulate packed size if possible |
| 70482933 | 873 | |
| fea9e956 | 874 | if Packed_Size_Known then |
| 70482933 | 875 | |
| fea9e956 ES |
876 | -- We can only deal with elementary types, since for |
| 877 | -- non-elementary components, alignment enters into the | |
| 878 | -- picture, and we don't know enough to handle proper | |
| 879 | -- alignment in this context. Packed arrays count as | |
| 880 | -- elementary if the representation is a modular type. | |
| fbf5a39b | 881 | |
| fea9e956 ES |
882 | if Is_Elementary_Type (Ctyp) |
| 883 | or else (Is_Array_Type (Ctyp) | |
| 884 | and then Present (Packed_Array_Type (Ctyp)) | |
| 885 | and then Is_Modular_Integer_Type | |
| 886 | (Packed_Array_Type (Ctyp))) | |
| 887 | then | |
| 888 | -- If RM_Size is known and static, then we can | |
| 889 | -- keep accumulating the packed size. | |
| 70482933 | 890 | |
| fea9e956 | 891 | if Known_Static_RM_Size (Ctyp) then |
| 70482933 | 892 | |
| fea9e956 ES |
893 | -- A little glitch, to be removed sometime ??? |
| 894 | -- gigi does not understand zero sizes yet. | |
| 895 | ||
| 896 | if RM_Size (Ctyp) = Uint_0 then | |
| 70482933 | 897 | Packed_Size_Known := False; |
| fea9e956 ES |
898 | |
| 899 | -- Normal case where we can keep accumulating the | |
| 900 | -- packed array size. | |
| 901 | ||
| 902 | else | |
| 903 | Packed_Size := Packed_Size + RM_Size (Ctyp); | |
| 70482933 | 904 | end if; |
| fbf5a39b | 905 | |
| fea9e956 ES |
906 | -- If we have a field whose RM_Size is not known then |
| 907 | -- we can't figure out the packed size here. | |
| fbf5a39b AC |
908 | |
| 909 | else | |
| 910 | Packed_Size_Known := False; | |
| 70482933 | 911 | end if; |
| fea9e956 ES |
912 | |
| 913 | -- If we have a non-elementary type we can't figure out | |
| 914 | -- the packed array size (alignment issues). | |
| 915 | ||
| 916 | else | |
| 917 | Packed_Size_Known := False; | |
| 70482933 | 918 | end if; |
| fbf5a39b | 919 | end if; |
| 70482933 | 920 | |
| fea9e956 | 921 | Next_Component_Or_Discriminant (Comp); |
| fbf5a39b | 922 | end loop; |
| 70482933 | 923 | |
| fbf5a39b | 924 | if Packed_Size_Known then |
| c6823a20 | 925 | Set_Small_Size (T, Packed_Size); |
| fbf5a39b | 926 | end if; |
| 70482933 | 927 | |
| fbf5a39b AC |
928 | return True; |
| 929 | end; | |
| 70482933 | 930 | |
| c6a9797e RD |
931 | -- All other cases, size not known at compile time |
| 932 | ||
| 70482933 RK |
933 | else |
| 934 | return False; | |
| 935 | end if; | |
| 936 | end Size_Known; | |
| 937 | ||
| 938 | ------------------------------------- | |
| 939 | -- Static_Discriminated_Components -- | |
| 940 | ------------------------------------- | |
| 941 | ||
| 942 | function Static_Discriminated_Components | |
| 0da2c8ac | 943 | (T : Entity_Id) return Boolean |
| 70482933 RK |
944 | is |
| 945 | Constraint : Elmt_Id; | |
| 946 | ||
| 947 | begin | |
| 948 | if Has_Discriminants (T) | |
| 949 | and then Present (Discriminant_Constraint (T)) | |
| 950 | and then Present (First_Component (T)) | |
| 951 | then | |
| 952 | Constraint := First_Elmt (Discriminant_Constraint (T)); | |
| 70482933 RK |
953 | while Present (Constraint) loop |
| 954 | if not Compile_Time_Known_Value (Node (Constraint)) then | |
| 955 | return False; | |
| 956 | end if; | |
| 957 | ||
| 958 | Next_Elmt (Constraint); | |
| 959 | end loop; | |
| 960 | end if; | |
| 961 | ||
| 962 | return True; | |
| 963 | end Static_Discriminated_Components; | |
| 964 | ||
| 965 | -- Start of processing for Check_Compile_Time_Size | |
| 966 | ||
| 967 | begin | |
| 968 | Set_Size_Known_At_Compile_Time (T, Size_Known (T)); | |
| 969 | end Check_Compile_Time_Size; | |
| 970 | ||
| 971 | ----------------------------- | |
| 972 | -- Check_Debug_Info_Needed -- | |
| 973 | ----------------------------- | |
| 974 | ||
| 975 | procedure Check_Debug_Info_Needed (T : Entity_Id) is | |
| 976 | begin | |
| 1b24ada5 | 977 | if Debug_Info_Off (T) then |
| 70482933 RK |
978 | return; |
| 979 | ||
| 980 | elsif Comes_From_Source (T) | |
| 981 | or else Debug_Generated_Code | |
| 982 | or else Debug_Flag_VV | |
| 1b24ada5 | 983 | or else Needs_Debug_Info (T) |
| 70482933 RK |
984 | then |
| 985 | Set_Debug_Info_Needed (T); | |
| 986 | end if; | |
| 987 | end Check_Debug_Info_Needed; | |
| 988 | ||
| 989 | ---------------------------- | |
| 990 | -- Check_Strict_Alignment -- | |
| 991 | ---------------------------- | |
| 992 | ||
| 993 | procedure Check_Strict_Alignment (E : Entity_Id) is | |
| 994 | Comp : Entity_Id; | |
| 995 | ||
| 996 | begin | |
| 997 | if Is_Tagged_Type (E) or else Is_Concurrent_Type (E) then | |
| 998 | Set_Strict_Alignment (E); | |
| 999 | ||
| 1000 | elsif Is_Array_Type (E) then | |
| 1001 | Set_Strict_Alignment (E, Strict_Alignment (Component_Type (E))); | |
| 1002 | ||
| 1003 | elsif Is_Record_Type (E) then | |
| 1004 | if Is_Limited_Record (E) then | |
| 1005 | Set_Strict_Alignment (E); | |
| 1006 | return; | |
| 1007 | end if; | |
| 1008 | ||
| 1009 | Comp := First_Component (E); | |
| 1010 | ||
| 1011 | while Present (Comp) loop | |
| 1012 | if not Is_Type (Comp) | |
| 1013 | and then (Strict_Alignment (Etype (Comp)) | |
| fbf5a39b | 1014 | or else Is_Aliased (Comp)) |
| 70482933 RK |
1015 | then |
| 1016 | Set_Strict_Alignment (E); | |
| 1017 | return; | |
| 1018 | end if; | |
| 1019 | ||
| 1020 | Next_Component (Comp); | |
| 1021 | end loop; | |
| 1022 | end if; | |
| 1023 | end Check_Strict_Alignment; | |
| 1024 | ||
| 1025 | ------------------------- | |
| 1026 | -- Check_Unsigned_Type -- | |
| 1027 | ------------------------- | |
| 1028 | ||
| 1029 | procedure Check_Unsigned_Type (E : Entity_Id) is | |
| 1030 | Ancestor : Entity_Id; | |
| 1031 | Lo_Bound : Node_Id; | |
| 1032 | Btyp : Entity_Id; | |
| 1033 | ||
| 1034 | begin | |
| 1035 | if not Is_Discrete_Or_Fixed_Point_Type (E) then | |
| 1036 | return; | |
| 1037 | end if; | |
| 1038 | ||
| 1039 | -- Do not attempt to analyze case where range was in error | |
| 1040 | ||
| 1041 | if Error_Posted (Scalar_Range (E)) then | |
| 1042 | return; | |
| 1043 | end if; | |
| 1044 | ||
| 1045 | -- The situation that is non trivial is something like | |
| 1046 | ||
| 1047 | -- subtype x1 is integer range -10 .. +10; | |
| 1048 | -- subtype x2 is x1 range 0 .. V1; | |
| 1049 | -- subtype x3 is x2 range V2 .. V3; | |
| 1050 | -- subtype x4 is x3 range V4 .. V5; | |
| 1051 | ||
| 1052 | -- where Vn are variables. Here the base type is signed, but we still | |
| 1053 | -- know that x4 is unsigned because of the lower bound of x2. | |
| 1054 | ||
| 1055 | -- The only way to deal with this is to look up the ancestor chain | |
| 1056 | ||
| 1057 | Ancestor := E; | |
| 1058 | loop | |
| 1059 | if Ancestor = Any_Type or else Etype (Ancestor) = Any_Type then | |
| 1060 | return; | |
| 1061 | end if; | |
| 1062 | ||
| 1063 | Lo_Bound := Type_Low_Bound (Ancestor); | |
| 1064 | ||
| 1065 | if Compile_Time_Known_Value (Lo_Bound) then | |
| 1066 | ||
| 1067 | if Expr_Rep_Value (Lo_Bound) >= 0 then | |
| 1068 | Set_Is_Unsigned_Type (E, True); | |
| 1069 | end if; | |
| 1070 | ||
| 1071 | return; | |
| 1072 | ||
| 1073 | else | |
| 1074 | Ancestor := Ancestor_Subtype (Ancestor); | |
| 1075 | ||
| 1076 | -- If no ancestor had a static lower bound, go to base type | |
| 1077 | ||
| 1078 | if No (Ancestor) then | |
| 1079 | ||
| 1080 | -- Note: the reason we still check for a compile time known | |
| 1081 | -- value for the base type is that at least in the case of | |
| 1082 | -- generic formals, we can have bounds that fail this test, | |
| 1083 | -- and there may be other cases in error situations. | |
| 1084 | ||
| 1085 | Btyp := Base_Type (E); | |
| 1086 | ||
| 1087 | if Btyp = Any_Type or else Etype (Btyp) = Any_Type then | |
| 1088 | return; | |
| 1089 | end if; | |
| 1090 | ||
| 1091 | Lo_Bound := Type_Low_Bound (Base_Type (E)); | |
| 1092 | ||
| 1093 | if Compile_Time_Known_Value (Lo_Bound) | |
| 1094 | and then Expr_Rep_Value (Lo_Bound) >= 0 | |
| 1095 | then | |
| 1096 | Set_Is_Unsigned_Type (E, True); | |
| 1097 | end if; | |
| 1098 | ||
| 1099 | return; | |
| 70482933 RK |
1100 | end if; |
| 1101 | end if; | |
| 1102 | end loop; | |
| 1103 | end Check_Unsigned_Type; | |
| 1104 | ||
| fbf5a39b AC |
1105 | ----------------------------- |
| 1106 | -- Expand_Atomic_Aggregate -- | |
| 1107 | ----------------------------- | |
| 1108 | ||
| 1109 | procedure Expand_Atomic_Aggregate (E : Entity_Id; Typ : Entity_Id) is | |
| 1110 | Loc : constant Source_Ptr := Sloc (E); | |
| 1111 | New_N : Node_Id; | |
| 1112 | Temp : Entity_Id; | |
| 1113 | ||
| 1114 | begin | |
| 1115 | if (Nkind (Parent (E)) = N_Object_Declaration | |
| 1116 | or else Nkind (Parent (E)) = N_Assignment_Statement) | |
| 1117 | and then Comes_From_Source (Parent (E)) | |
| fbf5a39b AC |
1118 | then |
| 1119 | Temp := | |
| 1120 | Make_Defining_Identifier (Loc, | |
| 1121 | New_Internal_Name ('T')); | |
| 1122 | ||
| 1123 | New_N := | |
| 1124 | Make_Object_Declaration (Loc, | |
| 1125 | Defining_Identifier => Temp, | |
| c6a9797e RD |
1126 | Object_Definition => New_Occurrence_Of (Typ, Loc), |
| 1127 | Expression => Relocate_Node (E)); | |
| fbf5a39b AC |
1128 | Insert_Before (Parent (E), New_N); |
| 1129 | Analyze (New_N); | |
| 1130 | ||
| 1131 | Set_Expression (Parent (E), New_Occurrence_Of (Temp, Loc)); | |
| 1132 | ||
| fbf5a39b AC |
1133 | end if; |
| 1134 | end Expand_Atomic_Aggregate; | |
| 1135 | ||
| 70482933 RK |
1136 | ---------------- |
| 1137 | -- Freeze_All -- | |
| 1138 | ---------------- | |
| 1139 | ||
| 1140 | -- Note: the easy coding for this procedure would be to just build a | |
| 1141 | -- single list of freeze nodes and then insert them and analyze them | |
| 1142 | -- all at once. This won't work, because the analysis of earlier freeze | |
| 1143 | -- nodes may recursively freeze types which would otherwise appear later | |
| 1144 | -- on in the freeze list. So we must analyze and expand the freeze nodes | |
| 1145 | -- as they are generated. | |
| 1146 | ||
| 1147 | procedure Freeze_All (From : Entity_Id; After : in out Node_Id) is | |
| 1148 | Loc : constant Source_Ptr := Sloc (After); | |
| 1149 | E : Entity_Id; | |
| 1150 | Decl : Node_Id; | |
| 1151 | ||
| 1152 | procedure Freeze_All_Ent (From : Entity_Id; After : in out Node_Id); | |
| def46b54 RD |
1153 | -- This is the internal recursive routine that does freezing of entities |
| 1154 | -- (but NOT the analysis of default expressions, which should not be | |
| 1155 | -- recursive, we don't want to analyze those till we are sure that ALL | |
| 1156 | -- the types are frozen). | |
| 70482933 | 1157 | |
| fbf5a39b AC |
1158 | -------------------- |
| 1159 | -- Freeze_All_Ent -- | |
| 1160 | -------------------- | |
| 1161 | ||
| 70482933 RK |
1162 | procedure Freeze_All_Ent |
| 1163 | (From : Entity_Id; | |
| 1164 | After : in out Node_Id) | |
| 1165 | is | |
| 1166 | E : Entity_Id; | |
| 1167 | Flist : List_Id; | |
| 1168 | Lastn : Node_Id; | |
| 1169 | ||
| 1170 | procedure Process_Flist; | |
| def46b54 RD |
1171 | -- If freeze nodes are present, insert and analyze, and reset cursor |
| 1172 | -- for next insertion. | |
| 70482933 | 1173 | |
| fbf5a39b AC |
1174 | ------------------- |
| 1175 | -- Process_Flist -- | |
| 1176 | ------------------- | |
| 1177 | ||
| 70482933 RK |
1178 | procedure Process_Flist is |
| 1179 | begin | |
| 1180 | if Is_Non_Empty_List (Flist) then | |
| 1181 | Lastn := Next (After); | |
| 1182 | Insert_List_After_And_Analyze (After, Flist); | |
| 1183 | ||
| 1184 | if Present (Lastn) then | |
| 1185 | After := Prev (Lastn); | |
| 1186 | else | |
| 1187 | After := Last (List_Containing (After)); | |
| 1188 | end if; | |
| 1189 | end if; | |
| 1190 | end Process_Flist; | |
| 1191 | ||
| fbf5a39b AC |
1192 | -- Start or processing for Freeze_All_Ent |
| 1193 | ||
| 70482933 RK |
1194 | begin |
| 1195 | E := From; | |
| 1196 | while Present (E) loop | |
| 1197 | ||
| 1198 | -- If the entity is an inner package which is not a package | |
| def46b54 RD |
1199 | -- renaming, then its entities must be frozen at this point. Note |
| 1200 | -- that such entities do NOT get frozen at the end of the nested | |
| 1201 | -- package itself (only library packages freeze). | |
| 70482933 RK |
1202 | |
| 1203 | -- Same is true for task declarations, where anonymous records | |
| 1204 | -- created for entry parameters must be frozen. | |
| 1205 | ||
| 1206 | if Ekind (E) = E_Package | |
| 1207 | and then No (Renamed_Object (E)) | |
| 1208 | and then not Is_Child_Unit (E) | |
| 1209 | and then not Is_Frozen (E) | |
| 1210 | then | |
| 7d8b9c99 | 1211 | Push_Scope (E); |
| 70482933 RK |
1212 | Install_Visible_Declarations (E); |
| 1213 | Install_Private_Declarations (E); | |
| 1214 | ||
| 1215 | Freeze_All (First_Entity (E), After); | |
| 1216 | ||
| 1217 | End_Package_Scope (E); | |
| 1218 | ||
| 1219 | elsif Ekind (E) in Task_Kind | |
| 1220 | and then | |
| 1221 | (Nkind (Parent (E)) = N_Task_Type_Declaration | |
| fbf5a39b | 1222 | or else |
| 70482933 RK |
1223 | Nkind (Parent (E)) = N_Single_Task_Declaration) |
| 1224 | then | |
| 7d8b9c99 | 1225 | Push_Scope (E); |
| 70482933 RK |
1226 | Freeze_All (First_Entity (E), After); |
| 1227 | End_Scope; | |
| 1228 | ||
| 1229 | -- For a derived tagged type, we must ensure that all the | |
| def46b54 RD |
1230 | -- primitive operations of the parent have been frozen, so that |
| 1231 | -- their addresses will be in the parent's dispatch table at the | |
| 1232 | -- point it is inherited. | |
| 70482933 RK |
1233 | |
| 1234 | elsif Ekind (E) = E_Record_Type | |
| 1235 | and then Is_Tagged_Type (E) | |
| 1236 | and then Is_Tagged_Type (Etype (E)) | |
| 1237 | and then Is_Derived_Type (E) | |
| 1238 | then | |
| 1239 | declare | |
| 1240 | Prim_List : constant Elist_Id := | |
| 1241 | Primitive_Operations (Etype (E)); | |
| fbf5a39b AC |
1242 | |
| 1243 | Prim : Elmt_Id; | |
| 1244 | Subp : Entity_Id; | |
| 70482933 RK |
1245 | |
| 1246 | begin | |
| 1247 | Prim := First_Elmt (Prim_List); | |
| 1248 | ||
| 1249 | while Present (Prim) loop | |
| 1250 | Subp := Node (Prim); | |
| 1251 | ||
| 1252 | if Comes_From_Source (Subp) | |
| 1253 | and then not Is_Frozen (Subp) | |
| 1254 | then | |
| 1255 | Flist := Freeze_Entity (Subp, Loc); | |
| 1256 | Process_Flist; | |
| 1257 | end if; | |
| 1258 | ||
| 1259 | Next_Elmt (Prim); | |
| 1260 | end loop; | |
| 1261 | end; | |
| 1262 | end if; | |
| 1263 | ||
| 1264 | if not Is_Frozen (E) then | |
| 1265 | Flist := Freeze_Entity (E, Loc); | |
| 1266 | Process_Flist; | |
| 1267 | end if; | |
| 1268 | ||
| def46b54 RD |
1269 | -- If an incomplete type is still not frozen, this may be a |
| 1270 | -- premature freezing because of a body declaration that follows. | |
| 1271 | -- Indicate where the freezing took place. | |
| fbf5a39b | 1272 | |
| def46b54 RD |
1273 | -- If the freezing is caused by the end of the current declarative |
| 1274 | -- part, it is a Taft Amendment type, and there is no error. | |
| fbf5a39b AC |
1275 | |
| 1276 | if not Is_Frozen (E) | |
| 1277 | and then Ekind (E) = E_Incomplete_Type | |
| 1278 | then | |
| 1279 | declare | |
| 1280 | Bod : constant Node_Id := Next (After); | |
| 1281 | ||
| 1282 | begin | |
| 1283 | if (Nkind (Bod) = N_Subprogram_Body | |
| 1284 | or else Nkind (Bod) = N_Entry_Body | |
| 1285 | or else Nkind (Bod) = N_Package_Body | |
| 1286 | or else Nkind (Bod) = N_Protected_Body | |
| 1287 | or else Nkind (Bod) = N_Task_Body | |
| 1288 | or else Nkind (Bod) in N_Body_Stub) | |
| 1289 | and then | |
| 1290 | List_Containing (After) = List_Containing (Parent (E)) | |
| 1291 | then | |
| 1292 | Error_Msg_Sloc := Sloc (Next (After)); | |
| 1293 | Error_Msg_NE | |
| 1294 | ("type& is frozen# before its full declaration", | |
| 1295 | Parent (E), E); | |
| 1296 | end if; | |
| 1297 | end; | |
| 1298 | end if; | |
| 1299 | ||
| 70482933 RK |
1300 | Next_Entity (E); |
| 1301 | end loop; | |
| 1302 | end Freeze_All_Ent; | |
| 1303 | ||
| 1304 | -- Start of processing for Freeze_All | |
| 1305 | ||
| 1306 | begin | |
| 1307 | Freeze_All_Ent (From, After); | |
| 1308 | ||
| 1309 | -- Now that all types are frozen, we can deal with default expressions | |
| 1310 | -- that require us to build a default expression functions. This is the | |
| 1311 | -- point at which such functions are constructed (after all types that | |
| 1312 | -- might be used in such expressions have been frozen). | |
| fbf5a39b | 1313 | |
| 70482933 RK |
1314 | -- We also add finalization chains to access types whose designated |
| 1315 | -- types are controlled. This is normally done when freezing the type, | |
| 1316 | -- but this misses recursive type definitions where the later members | |
| c6a9797e | 1317 | -- of the recursion introduce controlled components. |
| 70482933 RK |
1318 | |
| 1319 | -- Loop through entities | |
| 1320 | ||
| 1321 | E := From; | |
| 1322 | while Present (E) loop | |
| 70482933 RK |
1323 | if Is_Subprogram (E) then |
| 1324 | ||
| 1325 | if not Default_Expressions_Processed (E) then | |
| 1326 | Process_Default_Expressions (E, After); | |
| 1327 | end if; | |
| 1328 | ||
| 1329 | if not Has_Completion (E) then | |
| 1330 | Decl := Unit_Declaration_Node (E); | |
| 1331 | ||
| 1332 | if Nkind (Decl) = N_Subprogram_Renaming_Declaration then | |
| 1333 | Build_And_Analyze_Renamed_Body (Decl, E, After); | |
| 1334 | ||
| 1335 | elsif Nkind (Decl) = N_Subprogram_Declaration | |
| 1336 | and then Present (Corresponding_Body (Decl)) | |
| 1337 | and then | |
| 1338 | Nkind (Unit_Declaration_Node (Corresponding_Body (Decl))) | |
| fbf5a39b | 1339 | = N_Subprogram_Renaming_Declaration |
| 70482933 RK |
1340 | then |
| 1341 | Build_And_Analyze_Renamed_Body | |
| 1342 | (Decl, Corresponding_Body (Decl), After); | |
| 1343 | end if; | |
| 1344 | end if; | |
| 1345 | ||
| 1346 | elsif Ekind (E) in Task_Kind | |
| 1347 | and then | |
| 1348 | (Nkind (Parent (E)) = N_Task_Type_Declaration | |
| fbf5a39b | 1349 | or else |
| 70482933 RK |
1350 | Nkind (Parent (E)) = N_Single_Task_Declaration) |
| 1351 | then | |
| 1352 | declare | |
| 1353 | Ent : Entity_Id; | |
| 70482933 RK |
1354 | begin |
| 1355 | Ent := First_Entity (E); | |
| 1356 | ||
| 1357 | while Present (Ent) loop | |
| 1358 | ||
| 1359 | if Is_Entry (Ent) | |
| 1360 | and then not Default_Expressions_Processed (Ent) | |
| 1361 | then | |
| 1362 | Process_Default_Expressions (Ent, After); | |
| 1363 | end if; | |
| 1364 | ||
| 1365 | Next_Entity (Ent); | |
| 1366 | end loop; | |
| 1367 | end; | |
| 1368 | ||
| 1369 | elsif Is_Access_Type (E) | |
| 1370 | and then Comes_From_Source (E) | |
| 1371 | and then Ekind (Directly_Designated_Type (E)) = E_Incomplete_Type | |
| 048e5cef | 1372 | and then Needs_Finalization (Designated_Type (E)) |
| 70482933 RK |
1373 | and then No (Associated_Final_Chain (E)) |
| 1374 | then | |
| 1375 | Build_Final_List (Parent (E), E); | |
| 1376 | end if; | |
| 1377 | ||
| 1378 | Next_Entity (E); | |
| 1379 | end loop; | |
| 70482933 RK |
1380 | end Freeze_All; |
| 1381 | ||
| 1382 | ----------------------- | |
| 1383 | -- Freeze_And_Append -- | |
| 1384 | ----------------------- | |
| 1385 | ||
| 1386 | procedure Freeze_And_Append | |
| 1387 | (Ent : Entity_Id; | |
| 1388 | Loc : Source_Ptr; | |
| 1389 | Result : in out List_Id) | |
| 1390 | is | |
| 1391 | L : constant List_Id := Freeze_Entity (Ent, Loc); | |
| 70482933 RK |
1392 | begin |
| 1393 | if Is_Non_Empty_List (L) then | |
| 1394 | if Result = No_List then | |
| 1395 | Result := L; | |
| 1396 | else | |
| 1397 | Append_List (L, Result); | |
| 1398 | end if; | |
| 1399 | end if; | |
| 1400 | end Freeze_And_Append; | |
| 1401 | ||
| 1402 | ------------------- | |
| 1403 | -- Freeze_Before -- | |
| 1404 | ------------------- | |
| 1405 | ||
| 1406 | procedure Freeze_Before (N : Node_Id; T : Entity_Id) is | |
| 1407 | Freeze_Nodes : constant List_Id := Freeze_Entity (T, Sloc (N)); | |
| 70482933 RK |
1408 | begin |
| 1409 | if Is_Non_Empty_List (Freeze_Nodes) then | |
| fbf5a39b | 1410 | Insert_Actions (N, Freeze_Nodes); |
| 70482933 RK |
1411 | end if; |
| 1412 | end Freeze_Before; | |
| 1413 | ||
| 1414 | ------------------- | |
| 1415 | -- Freeze_Entity -- | |
| 1416 | ------------------- | |
| 1417 | ||
| 1418 | function Freeze_Entity (E : Entity_Id; Loc : Source_Ptr) return List_Id is | |
| c6823a20 | 1419 | Test_E : Entity_Id := E; |
| 70482933 RK |
1420 | Comp : Entity_Id; |
| 1421 | F_Node : Node_Id; | |
| 1422 | Result : List_Id; | |
| 1423 | Indx : Node_Id; | |
| 1424 | Formal : Entity_Id; | |
| 1425 | Atype : Entity_Id; | |
| 1426 | ||
| 4c8a5bb8 AC |
1427 | Has_Default_Initialization : Boolean := False; |
| 1428 | -- This flag gets set to true for a variable with default initialization | |
| 1429 | ||
| 70482933 | 1430 | procedure Check_Current_Instance (Comp_Decl : Node_Id); |
| edd63e9b ES |
1431 | -- Check that an Access or Unchecked_Access attribute with a prefix |
| 1432 | -- which is the current instance type can only be applied when the type | |
| 1433 | -- is limited. | |
| 70482933 RK |
1434 | |
| 1435 | function After_Last_Declaration return Boolean; | |
| 1436 | -- If Loc is a freeze_entity that appears after the last declaration | |
| 1437 | -- in the scope, inhibit error messages on late completion. | |
| 1438 | ||
| 1439 | procedure Freeze_Record_Type (Rec : Entity_Id); | |
| edd63e9b ES |
1440 | -- Freeze each component, handle some representation clauses, and freeze |
| 1441 | -- primitive operations if this is a tagged type. | |
| 70482933 RK |
1442 | |
| 1443 | ---------------------------- | |
| 1444 | -- After_Last_Declaration -- | |
| 1445 | ---------------------------- | |
| 1446 | ||
| 1447 | function After_Last_Declaration return Boolean is | |
| fbf5a39b | 1448 | Spec : constant Node_Id := Parent (Current_Scope); |
| 70482933 RK |
1449 | begin |
| 1450 | if Nkind (Spec) = N_Package_Specification then | |
| 1451 | if Present (Private_Declarations (Spec)) then | |
| 1452 | return Loc >= Sloc (Last (Private_Declarations (Spec))); | |
| 70482933 RK |
1453 | elsif Present (Visible_Declarations (Spec)) then |
| 1454 | return Loc >= Sloc (Last (Visible_Declarations (Spec))); | |
| 1455 | else | |
| 1456 | return False; | |
| 1457 | end if; | |
| 70482933 RK |
1458 | else |
| 1459 | return False; | |
| 1460 | end if; | |
| 1461 | end After_Last_Declaration; | |
| 1462 | ||
| 1463 | ---------------------------- | |
| 1464 | -- Check_Current_Instance -- | |
| 1465 | ---------------------------- | |
| 1466 | ||
| 1467 | procedure Check_Current_Instance (Comp_Decl : Node_Id) is | |
| 1468 | ||
| 32c760e6 ES |
1469 | Rec_Type : constant Entity_Id := |
| 1470 | Scope (Defining_Identifier (Comp_Decl)); | |
| 1471 | ||
| 1472 | Decl : constant Node_Id := Parent (Rec_Type); | |
| 1473 | ||
| 70482933 | 1474 | function Process (N : Node_Id) return Traverse_Result; |
| 49e90211 | 1475 | -- Process routine to apply check to given node |
| 70482933 | 1476 | |
| fbf5a39b AC |
1477 | ------------- |
| 1478 | -- Process -- | |
| 1479 | ------------- | |
| 1480 | ||
| 70482933 RK |
1481 | function Process (N : Node_Id) return Traverse_Result is |
| 1482 | begin | |
| 1483 | case Nkind (N) is | |
| 1484 | when N_Attribute_Reference => | |
| def46b54 | 1485 | if (Attribute_Name (N) = Name_Access |
| 70482933 RK |
1486 | or else |
| 1487 | Attribute_Name (N) = Name_Unchecked_Access) | |
| 1488 | and then Is_Entity_Name (Prefix (N)) | |
| 1489 | and then Is_Type (Entity (Prefix (N))) | |
| 1490 | and then Entity (Prefix (N)) = E | |
| 1491 | then | |
| 1492 | Error_Msg_N | |
| 1493 | ("current instance must be a limited type", Prefix (N)); | |
| 1494 | return Abandon; | |
| 1495 | else | |
| 1496 | return OK; | |
| 1497 | end if; | |
| 1498 | ||
| 1499 | when others => return OK; | |
| 1500 | end case; | |
| 1501 | end Process; | |
| 1502 | ||
| 1503 | procedure Traverse is new Traverse_Proc (Process); | |
| 1504 | ||
| 1505 | -- Start of processing for Check_Current_Instance | |
| 1506 | ||
| 1507 | begin | |
| 32c760e6 ES |
1508 | -- In Ada95, the (imprecise) rule is that the current instance of a |
| 1509 | -- limited type is aliased. In Ada2005, limitedness must be explicit: | |
| 1510 | -- either a tagged type, or a limited record. | |
| 1511 | ||
| 1512 | if Is_Limited_Type (Rec_Type) | |
| 1513 | and then | |
| 1514 | (Ada_Version < Ada_05 | |
| 1515 | or else Is_Tagged_Type (Rec_Type)) | |
| 1516 | then | |
| 1517 | return; | |
| 1518 | ||
| 1519 | elsif Nkind (Decl) = N_Full_Type_Declaration | |
| 1520 | and then Limited_Present (Type_Definition (Decl)) | |
| 1521 | then | |
| 1522 | return; | |
| 1523 | ||
| 1524 | else | |
| 1525 | Traverse (Comp_Decl); | |
| 1526 | end if; | |
| 70482933 RK |
1527 | end Check_Current_Instance; |
| 1528 | ||
| 1529 | ------------------------ | |
| 1530 | -- Freeze_Record_Type -- | |
| 1531 | ------------------------ | |
| 1532 | ||
| 1533 | procedure Freeze_Record_Type (Rec : Entity_Id) is | |
| 1534 | Comp : Entity_Id; | |
| fbf5a39b | 1535 | IR : Node_Id; |
| 70482933 | 1536 | ADC : Node_Id; |
| c6823a20 | 1537 | Prev : Entity_Id; |
| 70482933 | 1538 | |
| 67ce0d7e RD |
1539 | Junk : Boolean; |
| 1540 | pragma Warnings (Off, Junk); | |
| 1541 | ||
| 70482933 RK |
1542 | Unplaced_Component : Boolean := False; |
| 1543 | -- Set True if we find at least one component with no component | |
| 1544 | -- clause (used to warn about useless Pack pragmas). | |
| 1545 | ||
| 1546 | Placed_Component : Boolean := False; | |
| 1547 | -- Set True if we find at least one component with a component | |
| 1548 | -- clause (used to warn about useless Bit_Order pragmas). | |
| 1549 | ||
| e18d6a15 JM |
1550 | function Check_Allocator (N : Node_Id) return Node_Id; |
| 1551 | -- If N is an allocator, possibly wrapped in one or more level of | |
| 1552 | -- qualified expression(s), return the inner allocator node, else | |
| 1553 | -- return Empty. | |
| 19590d70 | 1554 | |
| 7d8b9c99 RD |
1555 | procedure Check_Itype (Typ : Entity_Id); |
| 1556 | -- If the component subtype is an access to a constrained subtype of | |
| 1557 | -- an already frozen type, make the subtype frozen as well. It might | |
| 1558 | -- otherwise be frozen in the wrong scope, and a freeze node on | |
| 1559 | -- subtype has no effect. Similarly, if the component subtype is a | |
| 1560 | -- regular (not protected) access to subprogram, set the anonymous | |
| 1561 | -- subprogram type to frozen as well, to prevent an out-of-scope | |
| 1562 | -- freeze node at some eventual point of call. Protected operations | |
| 1563 | -- are handled elsewhere. | |
| 6e059adb | 1564 | |
| 19590d70 GD |
1565 | --------------------- |
| 1566 | -- Check_Allocator -- | |
| 1567 | --------------------- | |
| 1568 | ||
| e18d6a15 JM |
1569 | function Check_Allocator (N : Node_Id) return Node_Id is |
| 1570 | Inner : Node_Id; | |
| 19590d70 | 1571 | begin |
| e18d6a15 | 1572 | Inner := N; |
| e18d6a15 JM |
1573 | loop |
| 1574 | if Nkind (Inner) = N_Allocator then | |
| 1575 | return Inner; | |
| e18d6a15 JM |
1576 | elsif Nkind (Inner) = N_Qualified_Expression then |
| 1577 | Inner := Expression (Inner); | |
| e18d6a15 JM |
1578 | else |
| 1579 | return Empty; | |
| 1580 | end if; | |
| 1581 | end loop; | |
| 19590d70 GD |
1582 | end Check_Allocator; |
| 1583 | ||
| 6871ba5f AC |
1584 | ----------------- |
| 1585 | -- Check_Itype -- | |
| 1586 | ----------------- | |
| 1587 | ||
| 7d8b9c99 RD |
1588 | procedure Check_Itype (Typ : Entity_Id) is |
| 1589 | Desig : constant Entity_Id := Designated_Type (Typ); | |
| 1590 | ||
| 6e059adb AC |
1591 | begin |
| 1592 | if not Is_Frozen (Desig) | |
| 1593 | and then Is_Frozen (Base_Type (Desig)) | |
| 1594 | then | |
| 1595 | Set_Is_Frozen (Desig); | |
| 1596 | ||
| 1597 | -- In addition, add an Itype_Reference to ensure that the | |
| 7d8b9c99 RD |
1598 | -- access subtype is elaborated early enough. This cannot be |
| 1599 | -- done if the subtype may depend on discriminants. | |
| 6e059adb AC |
1600 | |
| 1601 | if Ekind (Comp) = E_Component | |
| 1602 | and then Is_Itype (Etype (Comp)) | |
| 1603 | and then not Has_Discriminants (Rec) | |
| 1604 | then | |
| 1605 | IR := Make_Itype_Reference (Sloc (Comp)); | |
| 1606 | Set_Itype (IR, Desig); | |
| 1607 | ||
| 1608 | if No (Result) then | |
| 1609 | Result := New_List (IR); | |
| 1610 | else | |
| 1611 | Append (IR, Result); | |
| 1612 | end if; | |
| 1613 | end if; | |
| 7d8b9c99 RD |
1614 | |
| 1615 | elsif Ekind (Typ) = E_Anonymous_Access_Subprogram_Type | |
| 1616 | and then Convention (Desig) /= Convention_Protected | |
| 1617 | then | |
| 1618 | Set_Is_Frozen (Desig); | |
| 6e059adb AC |
1619 | end if; |
| 1620 | end Check_Itype; | |
| 1621 | ||
| 1622 | -- Start of processing for Freeze_Record_Type | |
| 1623 | ||
| 70482933 | 1624 | begin |
| 7d8b9c99 RD |
1625 | -- If this is a subtype of a controlled type, declared without a |
| 1626 | -- constraint, the _controller may not appear in the component list | |
| 1627 | -- if the parent was not frozen at the point of subtype declaration. | |
| 1628 | -- Inherit the _controller component now. | |
| fbf5a39b AC |
1629 | |
| 1630 | if Rec /= Base_Type (Rec) | |
| 1631 | and then Has_Controlled_Component (Rec) | |
| 1632 | then | |
| 1633 | if Nkind (Parent (Rec)) = N_Subtype_Declaration | |
| 1634 | and then Is_Entity_Name (Subtype_Indication (Parent (Rec))) | |
| 1635 | then | |
| 1636 | Set_First_Entity (Rec, First_Entity (Base_Type (Rec))); | |
| 1637 | ||
| 49e90211 | 1638 | -- If this is an internal type without a declaration, as for |
| 6871ba5f AC |
1639 | -- record component, the base type may not yet be frozen, and its |
| 1640 | -- controller has not been created. Add an explicit freeze node | |
| 49e90211 ES |
1641 | -- for the itype, so it will be frozen after the base type. This |
| 1642 | -- freeze node is used to communicate with the expander, in order | |
| 1643 | -- to create the controller for the enclosing record, and it is | |
| 1644 | -- deleted afterwards (see exp_ch3). It must not be created when | |
| 1645 | -- expansion is off, because it might appear in the wrong context | |
| 1646 | -- for the back end. | |
| fbf5a39b AC |
1647 | |
| 1648 | elsif Is_Itype (Rec) | |
| 1649 | and then Has_Delayed_Freeze (Base_Type (Rec)) | |
| 1650 | and then | |
| 1651 | Nkind (Associated_Node_For_Itype (Rec)) = | |
| 49e90211 ES |
1652 | N_Component_Declaration |
| 1653 | and then Expander_Active | |
| fbf5a39b AC |
1654 | then |
| 1655 | Ensure_Freeze_Node (Rec); | |
| 1656 | end if; | |
| 1657 | end if; | |
| 1658 | ||
| 49e90211 | 1659 | -- Freeze components and embedded subtypes |
| 70482933 RK |
1660 | |
| 1661 | Comp := First_Entity (Rec); | |
| c6823a20 | 1662 | Prev := Empty; |
| c6823a20 | 1663 | while Present (Comp) loop |
| 70482933 | 1664 | |
| 49e90211 | 1665 | -- First handle the (real) component case |
| 70482933 RK |
1666 | |
| 1667 | if Ekind (Comp) = E_Component | |
| 1668 | or else Ekind (Comp) = E_Discriminant | |
| 1669 | then | |
| 70482933 RK |
1670 | declare |
| 1671 | CC : constant Node_Id := Component_Clause (Comp); | |
| 1672 | ||
| 1673 | begin | |
| c6823a20 EB |
1674 | -- Freezing a record type freezes the type of each of its |
| 1675 | -- components. However, if the type of the component is | |
| 1676 | -- part of this record, we do not want or need a separate | |
| 1677 | -- Freeze_Node. Note that Is_Itype is wrong because that's | |
| 1678 | -- also set in private type cases. We also can't check for | |
| 1679 | -- the Scope being exactly Rec because of private types and | |
| 1680 | -- record extensions. | |
| 1681 | ||
| 1682 | if Is_Itype (Etype (Comp)) | |
| 1683 | and then Is_Record_Type (Underlying_Type | |
| 1684 | (Scope (Etype (Comp)))) | |
| 1685 | then | |
| 1686 | Undelay_Type (Etype (Comp)); | |
| 1687 | end if; | |
| 1688 | ||
| 1689 | Freeze_And_Append (Etype (Comp), Loc, Result); | |
| 1690 | ||
| 0da2c8ac AC |
1691 | -- Check for error of component clause given for variable |
| 1692 | -- sized type. We have to delay this test till this point, | |
| 1693 | -- since the component type has to be frozen for us to know | |
| 1694 | -- if it is variable length. We omit this test in a generic | |
| 1695 | -- context, it will be applied at instantiation time. | |
| 1696 | ||
| 70482933 RK |
1697 | if Present (CC) then |
| 1698 | Placed_Component := True; | |
| 1699 | ||
| 07fc65c4 GB |
1700 | if Inside_A_Generic then |
| 1701 | null; | |
| 1702 | ||
| 7d8b9c99 RD |
1703 | elsif not |
| 1704 | Size_Known_At_Compile_Time | |
| 1705 | (Underlying_Type (Etype (Comp))) | |
| 70482933 RK |
1706 | then |
| 1707 | Error_Msg_N | |
| 1708 | ("component clause not allowed for variable " & | |
| 1709 | "length component", CC); | |
| 1710 | end if; | |
| 1711 | ||
| 1712 | else | |
| 1713 | Unplaced_Component := True; | |
| 1714 | end if; | |
| 70482933 | 1715 | |
| 0da2c8ac | 1716 | -- Case of component requires byte alignment |
| 70482933 | 1717 | |
| 0da2c8ac | 1718 | if Must_Be_On_Byte_Boundary (Etype (Comp)) then |
| 70482933 | 1719 | |
| 0da2c8ac | 1720 | -- Set the enclosing record to also require byte align |
| 70482933 | 1721 | |
| 0da2c8ac | 1722 | Set_Must_Be_On_Byte_Boundary (Rec); |
| 70482933 | 1723 | |
| 7d8b9c99 RD |
1724 | -- Check for component clause that is inconsistent with |
| 1725 | -- the required byte boundary alignment. | |
| 70482933 | 1726 | |
| 0da2c8ac AC |
1727 | if Present (CC) |
| 1728 | and then Normalized_First_Bit (Comp) mod | |
| 1729 | System_Storage_Unit /= 0 | |
| 1730 | then | |
| 1731 | Error_Msg_N | |
| 1732 | ("component & must be byte aligned", | |
| 1733 | Component_Name (Component_Clause (Comp))); | |
| 1734 | end if; | |
| 1735 | end if; | |
| 70482933 | 1736 | |
| 7d8b9c99 RD |
1737 | -- If component clause is present, then deal with the non- |
| 1738 | -- default bit order case for Ada 95 mode. The required | |
| fea9e956 ES |
1739 | -- processing for Ada 2005 mode is handled separately after |
| 1740 | -- processing all components. | |
| 70482933 | 1741 | |
| 0da2c8ac AC |
1742 | -- We only do this processing for the base type, and in |
| 1743 | -- fact that's important, since otherwise if there are | |
| 1744 | -- record subtypes, we could reverse the bits once for | |
| 1745 | -- each subtype, which would be incorrect. | |
| 70482933 | 1746 | |
| 0da2c8ac AC |
1747 | if Present (CC) |
| 1748 | and then Reverse_Bit_Order (Rec) | |
| 1749 | and then Ekind (E) = E_Record_Type | |
| fea9e956 | 1750 | and then Ada_Version <= Ada_95 |
| 0da2c8ac AC |
1751 | then |
| 1752 | declare | |
| 1753 | CFB : constant Uint := Component_Bit_Offset (Comp); | |
| 1754 | CSZ : constant Uint := Esize (Comp); | |
| 1755 | CLC : constant Node_Id := Component_Clause (Comp); | |
| 1756 | Pos : constant Node_Id := Position (CLC); | |
| 1757 | FB : constant Node_Id := First_Bit (CLC); | |
| 1758 | ||
| 1759 | Storage_Unit_Offset : constant Uint := | |
| 1760 | CFB / System_Storage_Unit; | |
| 1761 | ||
| 1762 | Start_Bit : constant Uint := | |
| 1763 | CFB mod System_Storage_Unit; | |
| 1764 | ||
| 1765 | begin | |
| 1766 | -- Cases where field goes over storage unit boundary | |
| 1767 | ||
| 1768 | if Start_Bit + CSZ > System_Storage_Unit then | |
| 70482933 | 1769 | |
| 0da2c8ac AC |
1770 | -- Allow multi-byte field but generate warning |
| 1771 | ||
| 1772 | if Start_Bit mod System_Storage_Unit = 0 | |
| 1773 | and then CSZ mod System_Storage_Unit = 0 | |
| 1774 | then | |
| 70482933 | 1775 | Error_Msg_N |
| 0da2c8ac AC |
1776 | ("multi-byte field specified with non-standard" |
| 1777 | & " Bit_Order?", CLC); | |
| 1778 | ||
| 1779 | if Bytes_Big_Endian then | |
| 1780 | Error_Msg_N | |
| 1781 | ("bytes are not reversed " | |
| 1782 | & "(component is big-endian)?", CLC); | |
| 1783 | else | |
| 1784 | Error_Msg_N | |
| 1785 | ("bytes are not reversed " | |
| 1786 | & "(component is little-endian)?", CLC); | |
| 1787 | end if; | |
| 1788 | ||
| c6084ae0 | 1789 | -- Do not allow non-contiguous field |
| 0da2c8ac | 1790 | |
| 70482933 RK |
1791 | else |
| 1792 | Error_Msg_N | |
| c6084ae0 AC |
1793 | ("attempt to specify non-contiguous field " |
| 1794 | & "not permitted", CLC); | |
| 0da2c8ac | 1795 | Error_Msg_N |
| c6084ae0 AC |
1796 | ("\caused by non-standard Bit_Order " |
| 1797 | & "specified", CLC); | |
| 1798 | Error_Msg_N | |
| 1799 | ("\consider possibility of using " | |
| 1800 | & "Ada 2005 mode here", CLC); | |
| 70482933 RK |
1801 | end if; |
| 1802 | ||
| c6084ae0 | 1803 | -- Case where field fits in one storage unit |
| 70482933 RK |
1804 | |
| 1805 | else | |
| 0da2c8ac | 1806 | -- Give warning if suspicious component clause |
| 70482933 | 1807 | |
| fea9e956 ES |
1808 | if Intval (FB) >= System_Storage_Unit |
| 1809 | and then Warn_On_Reverse_Bit_Order | |
| 1810 | then | |
| 0da2c8ac AC |
1811 | Error_Msg_N |
| 1812 | ("?Bit_Order clause does not affect " & | |
| 1813 | "byte ordering", Pos); | |
| 1814 | Error_Msg_Uint_1 := | |
| 1815 | Intval (Pos) + Intval (FB) / | |
| 1816 | System_Storage_Unit; | |
| 1817 | Error_Msg_N | |
| 1818 | ("?position normalized to ^ before bit " & | |
| 1819 | "order interpreted", Pos); | |
| 1820 | end if; | |
| 70482933 | 1821 | |
| 0da2c8ac AC |
1822 | -- Here is where we fix up the Component_Bit_Offset |
| 1823 | -- value to account for the reverse bit order. | |
| 1824 | -- Some examples of what needs to be done are: | |
| 70482933 | 1825 | |
| 0da2c8ac AC |
1826 | -- First_Bit .. Last_Bit Component_Bit_Offset |
| 1827 | -- old new old new | |
| 70482933 | 1828 | |
| 0da2c8ac AC |
1829 | -- 0 .. 0 7 .. 7 0 7 |
| 1830 | -- 0 .. 1 6 .. 7 0 6 | |
| 1831 | -- 0 .. 2 5 .. 7 0 5 | |
| 1832 | -- 0 .. 7 0 .. 7 0 4 | |
| 70482933 | 1833 | |
| 0da2c8ac AC |
1834 | -- 1 .. 1 6 .. 6 1 6 |
| 1835 | -- 1 .. 4 3 .. 6 1 3 | |
| 1836 | -- 4 .. 7 0 .. 3 4 0 | |
| 70482933 | 1837 | |
| 0da2c8ac AC |
1838 | -- The general rule is that the first bit is |
| 1839 | -- is obtained by subtracting the old ending bit | |
| 1840 | -- from storage_unit - 1. | |
| 70482933 | 1841 | |
| 0da2c8ac AC |
1842 | Set_Component_Bit_Offset |
| 1843 | (Comp, | |
| 1844 | (Storage_Unit_Offset * System_Storage_Unit) + | |
| 1845 | (System_Storage_Unit - 1) - | |
| 1846 | (Start_Bit + CSZ - 1)); | |
| 70482933 | 1847 | |
| 0da2c8ac AC |
1848 | Set_Normalized_First_Bit |
| 1849 | (Comp, | |
| 1850 | Component_Bit_Offset (Comp) mod | |
| 1851 | System_Storage_Unit); | |
| 1852 | end if; | |
| 1853 | end; | |
| 1854 | end if; | |
| 1855 | end; | |
| 70482933 RK |
1856 | end if; |
| 1857 | ||
| c6823a20 EB |
1858 | -- If the component is an Itype with Delayed_Freeze and is either |
| 1859 | -- a record or array subtype and its base type has not yet been | |
| 1860 | -- frozen, we must remove this from the entity list of this | |
| 1861 | -- record and put it on the entity list of the scope of its base | |
| 1862 | -- type. Note that we know that this is not the type of a | |
| 1863 | -- component since we cleared Has_Delayed_Freeze for it in the | |
| 1864 | -- previous loop. Thus this must be the Designated_Type of an | |
| 1865 | -- access type, which is the type of a component. | |
| 1866 | ||
| 1867 | if Is_Itype (Comp) | |
| 1868 | and then Is_Type (Scope (Comp)) | |
| 1869 | and then Is_Composite_Type (Comp) | |
| 1870 | and then Base_Type (Comp) /= Comp | |
| 1871 | and then Has_Delayed_Freeze (Comp) | |
| 1872 | and then not Is_Frozen (Base_Type (Comp)) | |
| 1873 | then | |
| 1874 | declare | |
| 1875 | Will_Be_Frozen : Boolean := False; | |
| 1b24ada5 | 1876 | S : Entity_Id; |
| c6823a20 EB |
1877 | |
| 1878 | begin | |
| fea9e956 ES |
1879 | -- We have a pretty bad kludge here. Suppose Rec is subtype |
| 1880 | -- being defined in a subprogram that's created as part of | |
| 1881 | -- the freezing of Rec'Base. In that case, we know that | |
| 1882 | -- Comp'Base must have already been frozen by the time we | |
| 1883 | -- get to elaborate this because Gigi doesn't elaborate any | |
| 1884 | -- bodies until it has elaborated all of the declarative | |
| 1885 | -- part. But Is_Frozen will not be set at this point because | |
| 1886 | -- we are processing code in lexical order. | |
| 1887 | ||
| 1888 | -- We detect this case by going up the Scope chain of Rec | |
| 1889 | -- and seeing if we have a subprogram scope before reaching | |
| 1890 | -- the top of the scope chain or that of Comp'Base. If we | |
| 1891 | -- do, then mark that Comp'Base will actually be frozen. If | |
| 1892 | -- so, we merely undelay it. | |
| c6823a20 | 1893 | |
| 1b24ada5 | 1894 | S := Scope (Rec); |
| c6823a20 EB |
1895 | while Present (S) loop |
| 1896 | if Is_Subprogram (S) then | |
| 1897 | Will_Be_Frozen := True; | |
| 1898 | exit; | |
| 1899 | elsif S = Scope (Base_Type (Comp)) then | |
| 1900 | exit; | |
| 1901 | end if; | |
| 1902 | ||
| 1903 | S := Scope (S); | |
| 1904 | end loop; | |
| 1905 | ||
| 1906 | if Will_Be_Frozen then | |
| 1907 | Undelay_Type (Comp); | |
| 1908 | else | |
| 1909 | if Present (Prev) then | |
| 1910 | Set_Next_Entity (Prev, Next_Entity (Comp)); | |
| 1911 | else | |
| 1912 | Set_First_Entity (Rec, Next_Entity (Comp)); | |
| 1913 | end if; | |
| 1914 | ||
| 1915 | -- Insert in entity list of scope of base type (which | |
| 1916 | -- must be an enclosing scope, because still unfrozen). | |
| 1917 | ||
| 1918 | Append_Entity (Comp, Scope (Base_Type (Comp))); | |
| 1919 | end if; | |
| 1920 | end; | |
| 1921 | ||
| def46b54 RD |
1922 | -- If the component is an access type with an allocator as default |
| 1923 | -- value, the designated type will be frozen by the corresponding | |
| 1924 | -- expression in init_proc. In order to place the freeze node for | |
| 1925 | -- the designated type before that for the current record type, | |
| 1926 | -- freeze it now. | |
| c6823a20 EB |
1927 | |
| 1928 | -- Same process if the component is an array of access types, | |
| 1929 | -- initialized with an aggregate. If the designated type is | |
| def46b54 RD |
1930 | -- private, it cannot contain allocators, and it is premature |
| 1931 | -- to freeze the type, so we check for this as well. | |
| c6823a20 EB |
1932 | |
| 1933 | elsif Is_Access_Type (Etype (Comp)) | |
| 1934 | and then Present (Parent (Comp)) | |
| 1935 | and then Present (Expression (Parent (Comp))) | |
| c6823a20 EB |
1936 | then |
| 1937 | declare | |
| e18d6a15 JM |
1938 | Alloc : constant Node_Id := |
| 1939 | Check_Allocator (Expression (Parent (Comp))); | |
| c6823a20 EB |
1940 | |
| 1941 | begin | |
| e18d6a15 | 1942 | if Present (Alloc) then |
| 19590d70 | 1943 | |
| e18d6a15 JM |
1944 | -- If component is pointer to a classwide type, freeze |
| 1945 | -- the specific type in the expression being allocated. | |
| 1946 | -- The expression may be a subtype indication, in which | |
| 1947 | -- case freeze the subtype mark. | |
| c6823a20 | 1948 | |
| e18d6a15 JM |
1949 | if Is_Class_Wide_Type |
| 1950 | (Designated_Type (Etype (Comp))) | |
| 0f4cb75c | 1951 | then |
| e18d6a15 JM |
1952 | if Is_Entity_Name (Expression (Alloc)) then |
| 1953 | Freeze_And_Append | |
| 1954 | (Entity (Expression (Alloc)), Loc, Result); | |
| 1955 | elsif | |
| 1956 | Nkind (Expression (Alloc)) = N_Subtype_Indication | |
| 1957 | then | |
| 1958 | Freeze_And_Append | |
| 1959 | (Entity (Subtype_Mark (Expression (Alloc))), | |
| 1960 | Loc, Result); | |
| 1961 | end if; | |
| 0f4cb75c | 1962 | |
| e18d6a15 JM |
1963 | elsif Is_Itype (Designated_Type (Etype (Comp))) then |
| 1964 | Check_Itype (Etype (Comp)); | |
| 0f4cb75c | 1965 | |
| e18d6a15 JM |
1966 | else |
| 1967 | Freeze_And_Append | |
| 1968 | (Designated_Type (Etype (Comp)), Loc, Result); | |
| 1969 | end if; | |
| c6823a20 EB |
1970 | end if; |
| 1971 | end; | |
| 1972 | ||
| 1973 | elsif Is_Access_Type (Etype (Comp)) | |
| 1974 | and then Is_Itype (Designated_Type (Etype (Comp))) | |
| 1975 | then | |
| 7d8b9c99 | 1976 | Check_Itype (Etype (Comp)); |
| c6823a20 EB |
1977 | |
| 1978 | elsif Is_Array_Type (Etype (Comp)) | |
| 1979 | and then Is_Access_Type (Component_Type (Etype (Comp))) | |
| 1980 | and then Present (Parent (Comp)) | |
| 1981 | and then Nkind (Parent (Comp)) = N_Component_Declaration | |
| 1982 | and then Present (Expression (Parent (Comp))) | |
| 1983 | and then Nkind (Expression (Parent (Comp))) = N_Aggregate | |
| 1984 | and then Is_Fully_Defined | |
| 1985 | (Designated_Type (Component_Type (Etype (Comp)))) | |
| 1986 | then | |
| 1987 | Freeze_And_Append | |
| 1988 | (Designated_Type | |
| 1989 | (Component_Type (Etype (Comp))), Loc, Result); | |
| 1990 | end if; | |
| 1991 | ||
| 1992 | Prev := Comp; | |
| 70482933 RK |
1993 | Next_Entity (Comp); |
| 1994 | end loop; | |
| 1995 | ||
| fea9e956 ES |
1996 | -- Deal with pragma Bit_Order |
| 1997 | ||
| 1998 | if Reverse_Bit_Order (Rec) and then Base_Type (Rec) = Rec then | |
| 1999 | if not Placed_Component then | |
| 2000 | ADC := | |
| 2001 | Get_Attribute_Definition_Clause (Rec, Attribute_Bit_Order); | |
| 2002 | Error_Msg_N | |
| 2003 | ("?Bit_Order specification has no effect", ADC); | |
| 2004 | Error_Msg_N | |
| 2005 | ("\?since no component clauses were specified", ADC); | |
| 2006 | ||
| def46b54 RD |
2007 | -- Here is where we do Ada 2005 processing for bit order (the Ada |
| 2008 | -- 95 case was already taken care of above). | |
| 70482933 | 2009 | |
| fea9e956 ES |
2010 | elsif Ada_Version >= Ada_05 then |
| 2011 | Adjust_Record_For_Reverse_Bit_Order (Rec); | |
| 2012 | end if; | |
| 70482933 RK |
2013 | end if; |
| 2014 | ||
| 1b24ada5 RD |
2015 | -- Set OK_To_Reorder_Components depending on debug flags |
| 2016 | ||
| 2017 | if Rec = Base_Type (Rec) | |
| 2018 | and then Convention (Rec) = Convention_Ada | |
| 2019 | then | |
| 2020 | if (Has_Discriminants (Rec) and then Debug_Flag_Dot_V) | |
| 2021 | or else | |
| 2022 | (not Has_Discriminants (Rec) and then Debug_Flag_Dot_R) | |
| 2023 | then | |
| 2024 | Set_OK_To_Reorder_Components (Rec); | |
| 2025 | end if; | |
| 2026 | end if; | |
| 2027 | ||
| ee094616 RD |
2028 | -- Check for useless pragma Pack when all components placed. We only |
| 2029 | -- do this check for record types, not subtypes, since a subtype may | |
| 2030 | -- have all its components placed, and it still makes perfectly good | |
| 1b24ada5 RD |
2031 | -- sense to pack other subtypes or the parent type. We do not give |
| 2032 | -- this warning if Optimize_Alignment is set to Space, since the | |
| 2033 | -- pragma Pack does have an effect in this case (it always resets | |
| 2034 | -- the alignment to one). | |
| 70482933 | 2035 | |
| ee094616 RD |
2036 | if Ekind (Rec) = E_Record_Type |
| 2037 | and then Is_Packed (Rec) | |
| 70482933 | 2038 | and then not Unplaced_Component |
| 1b24ada5 | 2039 | and then Optimize_Alignment /= 'S' |
| 70482933 | 2040 | then |
| def46b54 RD |
2041 | -- Reset packed status. Probably not necessary, but we do it so |
| 2042 | -- that there is no chance of the back end doing something strange | |
| 2043 | -- with this redundant indication of packing. | |
| ee094616 | 2044 | |
| 70482933 | 2045 | Set_Is_Packed (Rec, False); |
| ee094616 RD |
2046 | |
| 2047 | -- Give warning if redundant constructs warnings on | |
| 2048 | ||
| 2049 | if Warn_On_Redundant_Constructs then | |
| 2050 | Error_Msg_N | |
| 2051 | ("?pragma Pack has no effect, no unplaced components", | |
| 2052 | Get_Rep_Pragma (Rec, Name_Pack)); | |
| 2053 | end if; | |
| 70482933 RK |
2054 | end if; |
| 2055 | ||
| ee094616 RD |
2056 | -- If this is the record corresponding to a remote type, freeze the |
| 2057 | -- remote type here since that is what we are semantically freezing. | |
| 2058 | -- This prevents the freeze node for that type in an inner scope. | |
| 70482933 RK |
2059 | |
| 2060 | -- Also, Check for controlled components and unchecked unions. | |
| ee094616 RD |
2061 | -- Finally, enforce the restriction that access attributes with a |
| 2062 | -- current instance prefix can only apply to limited types. | |
| 70482933 RK |
2063 | |
| 2064 | if Ekind (Rec) = E_Record_Type then | |
| 70482933 RK |
2065 | if Present (Corresponding_Remote_Type (Rec)) then |
| 2066 | Freeze_And_Append | |
| 2067 | (Corresponding_Remote_Type (Rec), Loc, Result); | |
| 2068 | end if; | |
| 2069 | ||
| 2070 | Comp := First_Component (Rec); | |
| 70482933 RK |
2071 | while Present (Comp) loop |
| 2072 | if Has_Controlled_Component (Etype (Comp)) | |
| 2073 | or else (Chars (Comp) /= Name_uParent | |
| 2074 | and then Is_Controlled (Etype (Comp))) | |
| 2075 | or else (Is_Protected_Type (Etype (Comp)) | |
| 2076 | and then Present | |
| 2077 | (Corresponding_Record_Type (Etype (Comp))) | |
| 2078 | and then Has_Controlled_Component | |
| 2079 | (Corresponding_Record_Type (Etype (Comp)))) | |
| 2080 | then | |
| 2081 | Set_Has_Controlled_Component (Rec); | |
| 2082 | exit; | |
| 2083 | end if; | |
| 2084 | ||
| 2085 | if Has_Unchecked_Union (Etype (Comp)) then | |
| 2086 | Set_Has_Unchecked_Union (Rec); | |
| 2087 | end if; | |
| 2088 | ||
| 32c760e6 ES |
2089 | if Has_Per_Object_Constraint (Comp) then |
| 2090 | ||
| ee094616 RD |
2091 | -- Scan component declaration for likely misuses of current |
| 2092 | -- instance, either in a constraint or a default expression. | |
| 70482933 RK |
2093 | |
| 2094 | Check_Current_Instance (Parent (Comp)); | |
| 2095 | end if; | |
| 2096 | ||
| 2097 | Next_Component (Comp); | |
| 2098 | end loop; | |
| 2099 | end if; | |
| 2100 | ||
| 2101 | Set_Component_Alignment_If_Not_Set (Rec); | |
| 2102 | ||
| ee094616 RD |
2103 | -- For first subtypes, check if there are any fixed-point fields with |
| 2104 | -- component clauses, where we must check the size. This is not done | |
| 2105 | -- till the freeze point, since for fixed-point types, we do not know | |
| 2106 | -- the size until the type is frozen. Similar processing applies to | |
| 2107 | -- bit packed arrays. | |
| 70482933 RK |
2108 | |
| 2109 | if Is_First_Subtype (Rec) then | |
| 2110 | Comp := First_Component (Rec); | |
| 2111 | ||
| 2112 | while Present (Comp) loop | |
| 2113 | if Present (Component_Clause (Comp)) | |
| d05ef0ab AC |
2114 | and then (Is_Fixed_Point_Type (Etype (Comp)) |
| 2115 | or else | |
| 2116 | Is_Bit_Packed_Array (Etype (Comp))) | |
| 70482933 RK |
2117 | then |
| 2118 | Check_Size | |
| d05ef0ab | 2119 | (Component_Name (Component_Clause (Comp)), |
| 70482933 RK |
2120 | Etype (Comp), |
| 2121 | Esize (Comp), | |
| 2122 | Junk); | |
| 2123 | end if; | |
| 2124 | ||
| 2125 | Next_Component (Comp); | |
| 2126 | end loop; | |
| 2127 | end if; | |
| 7d8b9c99 RD |
2128 | |
| 2129 | -- Generate warning for applying C or C++ convention to a record | |
| 2130 | -- with discriminants. This is suppressed for the unchecked union | |
| 1b24ada5 RD |
2131 | -- case, since the whole point in this case is interface C. We also |
| 2132 | -- do not generate this within instantiations, since we will have | |
| 2133 | -- generated a message on the template. | |
| 7d8b9c99 RD |
2134 | |
| 2135 | if Has_Discriminants (E) | |
| 2136 | and then not Is_Unchecked_Union (E) | |
| 7d8b9c99 RD |
2137 | and then (Convention (E) = Convention_C |
| 2138 | or else | |
| 2139 | Convention (E) = Convention_CPP) | |
| 2140 | and then Comes_From_Source (E) | |
| 1b24ada5 RD |
2141 | and then not In_Instance |
| 2142 | and then not Has_Warnings_Off (E) | |
| 2143 | and then not Has_Warnings_Off (Base_Type (E)) | |
| 7d8b9c99 RD |
2144 | then |
| 2145 | declare | |
| 2146 | Cprag : constant Node_Id := Get_Rep_Pragma (E, Name_Convention); | |
| 2147 | A2 : Node_Id; | |
| 2148 | ||
| 2149 | begin | |
| 2150 | if Present (Cprag) then | |
| 2151 | A2 := Next (First (Pragma_Argument_Associations (Cprag))); | |
| 2152 | ||
| 2153 | if Convention (E) = Convention_C then | |
| 2154 | Error_Msg_N | |
| 2155 | ("?variant record has no direct equivalent in C", A2); | |
| 2156 | else | |
| 2157 | Error_Msg_N | |
| 2158 | ("?variant record has no direct equivalent in C++", A2); | |
| 2159 | end if; | |
| 2160 | ||
| 2161 | Error_Msg_NE | |
| 2162 | ("\?use of convention for type& is dubious", A2, E); | |
| 2163 | end if; | |
| 2164 | end; | |
| 2165 | end if; | |
| 70482933 RK |
2166 | end Freeze_Record_Type; |
| 2167 | ||
| 2168 | -- Start of processing for Freeze_Entity | |
| 2169 | ||
| 2170 | begin | |
| c6823a20 EB |
2171 | -- We are going to test for various reasons why this entity need not be |
| 2172 | -- frozen here, but in the case of an Itype that's defined within a | |
| 2173 | -- record, that test actually applies to the record. | |
| 2174 | ||
| 2175 | if Is_Itype (E) and then Is_Record_Type (Scope (E)) then | |
| 2176 | Test_E := Scope (E); | |
| 2177 | elsif Is_Itype (E) and then Present (Underlying_Type (Scope (E))) | |
| 2178 | and then Is_Record_Type (Underlying_Type (Scope (E))) | |
| 2179 | then | |
| 2180 | Test_E := Underlying_Type (Scope (E)); | |
| 2181 | end if; | |
| 2182 | ||
| fbf5a39b | 2183 | -- Do not freeze if already frozen since we only need one freeze node |
| 70482933 RK |
2184 | |
| 2185 | if Is_Frozen (E) then | |
| 2186 | return No_List; | |
| 2187 | ||
| c6823a20 EB |
2188 | -- It is improper to freeze an external entity within a generic because |
| 2189 | -- its freeze node will appear in a non-valid context. The entity will | |
| 2190 | -- be frozen in the proper scope after the current generic is analyzed. | |
| 70482933 | 2191 | |
| c6823a20 | 2192 | elsif Inside_A_Generic and then External_Ref_In_Generic (Test_E) then |
| 70482933 RK |
2193 | return No_List; |
| 2194 | ||
| 2195 | -- Do not freeze a global entity within an inner scope created during | |
| 2196 | -- expansion. A call to subprogram E within some internal procedure | |
| 2197 | -- (a stream attribute for example) might require freezing E, but the | |
| 2198 | -- freeze node must appear in the same declarative part as E itself. | |
| 2199 | -- The two-pass elaboration mechanism in gigi guarantees that E will | |
| 2200 | -- be frozen before the inner call is elaborated. We exclude constants | |
| 2201 | -- from this test, because deferred constants may be frozen early, and | |
| 19590d70 GD |
2202 | -- must be diagnosed (e.g. in the case of a deferred constant being used |
| 2203 | -- in a default expression). If the enclosing subprogram comes from | |
| 2204 | -- source, or is a generic instance, then the freeze point is the one | |
| 2205 | -- mandated by the language, and we freeze the entity. A subprogram that | |
| 2206 | -- is a child unit body that acts as a spec does not have a spec that | |
| 2207 | -- comes from source, but can only come from source. | |
| 70482933 | 2208 | |
| c6823a20 EB |
2209 | elsif In_Open_Scopes (Scope (Test_E)) |
| 2210 | and then Scope (Test_E) /= Current_Scope | |
| 2211 | and then Ekind (Test_E) /= E_Constant | |
| 70482933 RK |
2212 | then |
| 2213 | declare | |
| 2214 | S : Entity_Id := Current_Scope; | |
| 2215 | ||
| 2216 | begin | |
| 2217 | while Present (S) loop | |
| 2218 | if Is_Overloadable (S) then | |
| 2219 | if Comes_From_Source (S) | |
| 2220 | or else Is_Generic_Instance (S) | |
| fea9e956 | 2221 | or else Is_Child_Unit (S) |
| 70482933 RK |
2222 | then |
| 2223 | exit; | |
| 2224 | else | |
| 2225 | return No_List; | |
| 2226 | end if; | |
| 2227 | end if; | |
| 2228 | ||
| 2229 | S := Scope (S); | |
| 2230 | end loop; | |
| 2231 | end; | |
| 555360a5 AC |
2232 | |
| 2233 | -- Similarly, an inlined instance body may make reference to global | |
| 2234 | -- entities, but these references cannot be the proper freezing point | |
| def46b54 RD |
2235 | -- for them, and in the absence of inlining freezing will take place in |
| 2236 | -- their own scope. Normally instance bodies are analyzed after the | |
| 2237 | -- enclosing compilation, and everything has been frozen at the proper | |
| 2238 | -- place, but with front-end inlining an instance body is compiled | |
| 2239 | -- before the end of the enclosing scope, and as a result out-of-order | |
| 2240 | -- freezing must be prevented. | |
| 555360a5 AC |
2241 | |
| 2242 | elsif Front_End_Inlining | |
| 7d8b9c99 | 2243 | and then In_Instance_Body |
| c6823a20 | 2244 | and then Present (Scope (Test_E)) |
| 555360a5 AC |
2245 | then |
| 2246 | declare | |
| c6823a20 EB |
2247 | S : Entity_Id := Scope (Test_E); |
| 2248 | ||
| 555360a5 AC |
2249 | begin |
| 2250 | while Present (S) loop | |
| 2251 | if Is_Generic_Instance (S) then | |
| 2252 | exit; | |
| 2253 | else | |
| 2254 | S := Scope (S); | |
| 2255 | end if; | |
| 2256 | end loop; | |
| 2257 | ||
| 2258 | if No (S) then | |
| 2259 | return No_List; | |
| 2260 | end if; | |
| 2261 | end; | |
| 70482933 RK |
2262 | end if; |
| 2263 | ||
| 2264 | -- Here to freeze the entity | |
| 2265 | ||
| 2266 | Result := No_List; | |
| 2267 | Set_Is_Frozen (E); | |
| 2268 | ||
| 2269 | -- Case of entity being frozen is other than a type | |
| 2270 | ||
| 2271 | if not Is_Type (E) then | |
| 2272 | ||
| 2273 | -- If entity is exported or imported and does not have an external | |
| 2274 | -- name, now is the time to provide the appropriate default name. | |
| 2275 | -- Skip this if the entity is stubbed, since we don't need a name | |
| 2276 | -- for any stubbed routine. | |
| 2277 | ||
| 2278 | if (Is_Imported (E) or else Is_Exported (E)) | |
| 2279 | and then No (Interface_Name (E)) | |
| 2280 | and then Convention (E) /= Convention_Stubbed | |
| 2281 | then | |
| 2282 | Set_Encoded_Interface_Name | |
| 2283 | (E, Get_Default_External_Name (E)); | |
| fbf5a39b | 2284 | |
| bbaba73f EB |
2285 | -- If entity is an atomic object appearing in a declaration and |
| 2286 | -- the expression is an aggregate, assign it to a temporary to | |
| 2287 | -- ensure that the actual assignment is done atomically rather | |
| 2288 | -- than component-wise (the assignment to the temp may be done | |
| 2289 | -- component-wise, but that is harmless). | |
| fbf5a39b AC |
2290 | |
| 2291 | elsif Is_Atomic (E) | |
| 2292 | and then Nkind (Parent (E)) = N_Object_Declaration | |
| 2293 | and then Present (Expression (Parent (E))) | |
| bbaba73f | 2294 | and then Nkind (Expression (Parent (E))) = N_Aggregate |
| fbf5a39b | 2295 | then |
| bbaba73f | 2296 | Expand_Atomic_Aggregate (Expression (Parent (E)), Etype (E)); |
| 70482933 RK |
2297 | end if; |
| 2298 | ||
| 2299 | -- For a subprogram, freeze all parameter types and also the return | |
| fbf5a39b | 2300 | -- type (RM 13.14(14)). However skip this for internal subprograms. |
| 70482933 RK |
2301 | -- This is also the point where any extra formal parameters are |
| 2302 | -- created since we now know whether the subprogram will use | |
| 2303 | -- a foreign convention. | |
| 2304 | ||
| 2305 | if Is_Subprogram (E) then | |
| 70482933 | 2306 | if not Is_Internal (E) then |
| 70482933 | 2307 | declare |
| 6d11af89 | 2308 | F_Type : Entity_Id; |
| def46b54 | 2309 | R_Type : Entity_Id; |
| 6d11af89 | 2310 | Warn_Node : Node_Id; |
| 70482933 | 2311 | |
| 70482933 RK |
2312 | begin |
| 2313 | -- Loop through formals | |
| 2314 | ||
| 2315 | Formal := First_Formal (E); | |
| 70482933 | 2316 | while Present (Formal) loop |
| 70482933 RK |
2317 | F_Type := Etype (Formal); |
| 2318 | Freeze_And_Append (F_Type, Loc, Result); | |
| 2319 | ||
| 2320 | if Is_Private_Type (F_Type) | |
| 2321 | and then Is_Private_Type (Base_Type (F_Type)) | |
| 2322 | and then No (Full_View (Base_Type (F_Type))) | |
| 2323 | and then not Is_Generic_Type (F_Type) | |
| 2324 | and then not Is_Derived_Type (F_Type) | |
| 2325 | then | |
| 2326 | -- If the type of a formal is incomplete, subprogram | |
| 2327 | -- is being frozen prematurely. Within an instance | |
| 2328 | -- (but not within a wrapper package) this is an | |
| 2329 | -- an artifact of our need to regard the end of an | |
| 2330 | -- instantiation as a freeze point. Otherwise it is | |
| 2331 | -- a definite error. | |
| fbf5a39b | 2332 | |
| 70482933 RK |
2333 | -- and then not Is_Wrapper_Package (Current_Scope) ??? |
| 2334 | ||
| 2335 | if In_Instance then | |
| 2336 | Set_Is_Frozen (E, False); | |
| 2337 | return No_List; | |
| 2338 | ||
| 86cde7b1 RD |
2339 | elsif not After_Last_Declaration |
| 2340 | and then not Freezing_Library_Level_Tagged_Type | |
| 2341 | then | |
| 70482933 RK |
2342 | Error_Msg_Node_1 := F_Type; |
| 2343 | Error_Msg | |
| 2344 | ("type& must be fully defined before this point", | |
| 2345 | Loc); | |
| 2346 | end if; | |
| 2347 | end if; | |
| 2348 | ||
| def46b54 | 2349 | -- Check suspicious parameter for C function. These tests |
| 1b24ada5 | 2350 | -- apply only to exported/imported subprograms. |
| 70482933 | 2351 | |
| def46b54 | 2352 | if Warn_On_Export_Import |
| 1b24ada5 | 2353 | and then Comes_From_Source (E) |
| def46b54 RD |
2354 | and then (Convention (E) = Convention_C |
| 2355 | or else | |
| 2356 | Convention (E) = Convention_CPP) | |
| def46b54 | 2357 | and then (Is_Imported (E) or else Is_Exported (E)) |
| 1b24ada5 RD |
2358 | and then Convention (E) /= Convention (Formal) |
| 2359 | and then not Has_Warnings_Off (E) | |
| 2360 | and then not Has_Warnings_Off (F_Type) | |
| 2361 | and then not Has_Warnings_Off (Formal) | |
| fbf5a39b | 2362 | then |
| 70482933 | 2363 | Error_Msg_Qual_Level := 1; |
| def46b54 RD |
2364 | |
| 2365 | -- Check suspicious use of fat C pointer | |
| 2366 | ||
| 2367 | if Is_Access_Type (F_Type) | |
| 2368 | and then Esize (F_Type) > Ttypes.System_Address_Size | |
| 2369 | then | |
| 2370 | Error_Msg_N | |
| 2371 | ("?type of & does not correspond " | |
| 2372 | & "to C pointer!", Formal); | |
| 2373 | ||
| 2374 | -- Check suspicious return of boolean | |
| 2375 | ||
| 2376 | elsif Root_Type (F_Type) = Standard_Boolean | |
| 2377 | and then Convention (F_Type) = Convention_Ada | |
| 67198556 RD |
2378 | and then not Has_Warnings_Off (F_Type) |
| 2379 | and then not Has_Size_Clause (F_Type) | |
| def46b54 RD |
2380 | then |
| 2381 | Error_Msg_N | |
| 2382 | ("?& is an 8-bit Ada Boolean, " | |
| 2383 | & "use char in C!", Formal); | |
| 2384 | ||
| 2385 | -- Check suspicious tagged type | |
| 2386 | ||
| 2387 | elsif (Is_Tagged_Type (F_Type) | |
| 2388 | or else (Is_Access_Type (F_Type) | |
| 2389 | and then | |
| 2390 | Is_Tagged_Type | |
| 2391 | (Designated_Type (F_Type)))) | |
| 2392 | and then Convention (E) = Convention_C | |
| 2393 | then | |
| 2394 | Error_Msg_N | |
| 2395 | ("?& is a tagged type which does not " | |
| 2396 | & "correspond to any C type!", Formal); | |
| 2397 | ||
| 2398 | -- Check wrong convention subprogram pointer | |
| 2399 | ||
| 2400 | elsif Ekind (F_Type) = E_Access_Subprogram_Type | |
| 2401 | and then not Has_Foreign_Convention (F_Type) | |
| 2402 | then | |
| 2403 | Error_Msg_N | |
| 2404 | ("?subprogram pointer & should " | |
| 2405 | & "have foreign convention!", Formal); | |
| 2406 | Error_Msg_Sloc := Sloc (F_Type); | |
| 2407 | Error_Msg_NE | |
| 2408 | ("\?add Convention pragma to declaration of &#", | |
| 2409 | Formal, F_Type); | |
| 2410 | end if; | |
| 2411 | ||
| 70482933 RK |
2412 | Error_Msg_Qual_Level := 0; |
| 2413 | end if; | |
| 2414 | ||
| 2415 | -- Check for unconstrained array in exported foreign | |
| 2416 | -- convention case. | |
| 2417 | ||
| def46b54 | 2418 | if Has_Foreign_Convention (E) |
| 70482933 RK |
2419 | and then not Is_Imported (E) |
| 2420 | and then Is_Array_Type (F_Type) | |
| 2421 | and then not Is_Constrained (F_Type) | |
| fbf5a39b | 2422 | and then Warn_On_Export_Import |
| 70482933 RK |
2423 | then |
| 2424 | Error_Msg_Qual_Level := 1; | |
| 6d11af89 AC |
2425 | |
| 2426 | -- If this is an inherited operation, place the | |
| 2427 | -- warning on the derived type declaration, rather | |
| 2428 | -- than on the original subprogram. | |
| 2429 | ||
| 2430 | if Nkind (Original_Node (Parent (E))) = | |
| 2431 | N_Full_Type_Declaration | |
| 2432 | then | |
| 2433 | Warn_Node := Parent (E); | |
| 2434 | ||
| 2435 | if Formal = First_Formal (E) then | |
| 2436 | Error_Msg_NE | |
| add9f797 | 2437 | ("?in inherited operation&", Warn_Node, E); |
| 6d11af89 AC |
2438 | end if; |
| 2439 | else | |
| 2440 | Warn_Node := Formal; | |
| 2441 | end if; | |
| 2442 | ||
| 2443 | Error_Msg_NE | |
| 70482933 | 2444 | ("?type of argument& is unconstrained array", |
| 6d11af89 AC |
2445 | Warn_Node, Formal); |
| 2446 | Error_Msg_NE | |
| 70482933 | 2447 | ("?foreign caller must pass bounds explicitly", |
| 6d11af89 | 2448 | Warn_Node, Formal); |
| 70482933 RK |
2449 | Error_Msg_Qual_Level := 0; |
| 2450 | end if; | |
| 2451 | ||
| d8db0bca JM |
2452 | if not From_With_Type (F_Type) then |
| 2453 | if Is_Access_Type (F_Type) then | |
| 2454 | F_Type := Designated_Type (F_Type); | |
| 2455 | end if; | |
| 2456 | ||
| 7d8b9c99 RD |
2457 | -- If the formal is an anonymous_access_to_subprogram |
| 2458 | -- freeze the subprogram type as well, to prevent | |
| 2459 | -- scope anomalies in gigi, because there is no other | |
| 2460 | -- clear point at which it could be frozen. | |
| 2461 | ||
| 93bcda23 | 2462 | if Is_Itype (Etype (Formal)) |
| 7d8b9c99 RD |
2463 | and then Ekind (F_Type) = E_Subprogram_Type |
| 2464 | then | |
| 57747aec | 2465 | Freeze_And_Append (F_Type, Loc, Result); |
| d8db0bca JM |
2466 | end if; |
| 2467 | end if; | |
| 2468 | ||
| 70482933 RK |
2469 | Next_Formal (Formal); |
| 2470 | end loop; | |
| 2471 | ||
| 5e39baa6 | 2472 | -- Case of function: similar checks on return type |
| 70482933 RK |
2473 | |
| 2474 | if Ekind (E) = E_Function then | |
| def46b54 RD |
2475 | |
| 2476 | -- Freeze return type | |
| 2477 | ||
| 2478 | R_Type := Etype (E); | |
| 2479 | Freeze_And_Append (R_Type, Loc, Result); | |
| 2480 | ||
| 2481 | -- Check suspicious return type for C function | |
| 70482933 | 2482 | |
| fbf5a39b | 2483 | if Warn_On_Export_Import |
| def46b54 RD |
2484 | and then (Convention (E) = Convention_C |
| 2485 | or else | |
| 2486 | Convention (E) = Convention_CPP) | |
| def46b54 | 2487 | and then (Is_Imported (E) or else Is_Exported (E)) |
| fbf5a39b | 2488 | then |
| def46b54 RD |
2489 | -- Check suspicious return of fat C pointer |
| 2490 | ||
| 2491 | if Is_Access_Type (R_Type) | |
| 2492 | and then Esize (R_Type) > Ttypes.System_Address_Size | |
| 1b24ada5 RD |
2493 | and then not Has_Warnings_Off (E) |
| 2494 | and then not Has_Warnings_Off (R_Type) | |
| def46b54 RD |
2495 | then |
| 2496 | Error_Msg_N | |
| 2497 | ("?return type of& does not " | |
| 2498 | & "correspond to C pointer!", E); | |
| 2499 | ||
| 2500 | -- Check suspicious return of boolean | |
| 2501 | ||
| 2502 | elsif Root_Type (R_Type) = Standard_Boolean | |
| 2503 | and then Convention (R_Type) = Convention_Ada | |
| 1b24ada5 RD |
2504 | and then not Has_Warnings_Off (E) |
| 2505 | and then not Has_Warnings_Off (R_Type) | |
| 67198556 | 2506 | and then not Has_Size_Clause (R_Type) |
| def46b54 RD |
2507 | then |
| 2508 | Error_Msg_N | |
| 2509 | ("?return type of & is an 8-bit " | |
| 2510 | & "Ada Boolean, use char in C!", E); | |
| 70482933 | 2511 | |
| def46b54 RD |
2512 | -- Check suspicious return tagged type |
| 2513 | ||
| 2514 | elsif (Is_Tagged_Type (R_Type) | |
| 2515 | or else (Is_Access_Type (R_Type) | |
| 2516 | and then | |
| 2517 | Is_Tagged_Type | |
| 2518 | (Designated_Type (R_Type)))) | |
| 2519 | and then Convention (E) = Convention_C | |
| 1b24ada5 RD |
2520 | and then not Has_Warnings_Off (E) |
| 2521 | and then not Has_Warnings_Off (R_Type) | |
| def46b54 RD |
2522 | then |
| 2523 | Error_Msg_N | |
| 2524 | ("?return type of & does not " | |
| 2525 | & "correspond to C type!", E); | |
| 2526 | ||
| 2527 | -- Check return of wrong convention subprogram pointer | |
| 2528 | ||
| 2529 | elsif Ekind (R_Type) = E_Access_Subprogram_Type | |
| 2530 | and then not Has_Foreign_Convention (R_Type) | |
| 1b24ada5 RD |
2531 | and then not Has_Warnings_Off (E) |
| 2532 | and then not Has_Warnings_Off (R_Type) | |
| def46b54 RD |
2533 | then |
| 2534 | Error_Msg_N | |
| 2535 | ("?& should return a foreign " | |
| 2536 | & "convention subprogram pointer", E); | |
| 2537 | Error_Msg_Sloc := Sloc (R_Type); | |
| 2538 | Error_Msg_NE | |
| 2539 | ("\?add Convention pragma to declaration of& #", | |
| 2540 | E, R_Type); | |
| 2541 | end if; | |
| 2542 | end if; | |
| 2543 | ||
| 93bcda23 AC |
2544 | if Is_Array_Type (R_Type) |
| 2545 | and then not Is_Constrained (R_Type) | |
| 70482933 | 2546 | and then not Is_Imported (E) |
| def46b54 | 2547 | and then Has_Foreign_Convention (E) |
| fbf5a39b | 2548 | and then Warn_On_Export_Import |
| 1b24ada5 | 2549 | and then not Has_Warnings_Off (E) |
| 93bcda23 | 2550 | and then not Has_Warnings_Off (R_Type) |
| 70482933 RK |
2551 | then |
| 2552 | Error_Msg_N | |
| fbf5a39b | 2553 | ("?foreign convention function& should not " & |
| 1b24ada5 | 2554 | "return unconstrained array!", E); |
| 70482933 RK |
2555 | end if; |
| 2556 | end if; | |
| 2557 | end; | |
| 2558 | end if; | |
| 2559 | ||
| 2560 | -- Must freeze its parent first if it is a derived subprogram | |
| 2561 | ||
| 2562 | if Present (Alias (E)) then | |
| 2563 | Freeze_And_Append (Alias (E), Loc, Result); | |
| 2564 | end if; | |
| 2565 | ||
| 19590d70 GD |
2566 | -- We don't freeze internal subprograms, because we don't normally |
| 2567 | -- want addition of extra formals or mechanism setting to happen | |
| 2568 | -- for those. However we do pass through predefined dispatching | |
| 2569 | -- cases, since extra formals may be needed in some cases, such as | |
| 2570 | -- for the stream 'Input function (build-in-place formals). | |
| 2571 | ||
| 2572 | if not Is_Internal (E) | |
| 2573 | or else Is_Predefined_Dispatching_Operation (E) | |
| 2574 | then | |
| 70482933 RK |
2575 | Freeze_Subprogram (E); |
| 2576 | end if; | |
| 2577 | ||
| 2578 | -- Here for other than a subprogram or type | |
| 2579 | ||
| 2580 | else | |
| 2581 | -- If entity has a type, and it is not a generic unit, then | |
| 7d8b9c99 | 2582 | -- freeze it first (RM 13.14(10)). |
| 70482933 | 2583 | |
| ac72c9c5 | 2584 | if Present (Etype (E)) |
| 70482933 RK |
2585 | and then Ekind (E) /= E_Generic_Function |
| 2586 | then | |
| 2587 | Freeze_And_Append (Etype (E), Loc, Result); | |
| 2588 | end if; | |
| 2589 | ||
| 2c9beb8a | 2590 | -- Special processing for objects created by object declaration |
| 70482933 RK |
2591 | |
| 2592 | if Nkind (Declaration_Node (E)) = N_Object_Declaration then | |
| 2c9beb8a RD |
2593 | |
| 2594 | -- For object created by object declaration, perform required | |
| 2595 | -- categorization (preelaborate and pure) checks. Defer these | |
| 2596 | -- checks to freeze time since pragma Import inhibits default | |
| 2597 | -- initialization and thus pragma Import affects these checks. | |
| 2598 | ||
| 70482933 | 2599 | Validate_Object_Declaration (Declaration_Node (E)); |
| 2c9beb8a | 2600 | |
| 1ce1f005 | 2601 | -- If there is an address clause, check that it is valid |
| 2c9beb8a | 2602 | |
| fbf5a39b | 2603 | Check_Address_Clause (E); |
| 2c9beb8a | 2604 | |
| 1ce1f005 GD |
2605 | -- If the object needs any kind of default initialization, an |
| 2606 | -- error must be issued if No_Default_Initialization applies. | |
| 2607 | -- The check doesn't apply to imported objects, which are not | |
| 2608 | -- ever default initialized, and is why the check is deferred | |
| 2609 | -- until freezing, at which point we know if Import applies. | |
| 4fec4e7a ES |
2610 | -- Deferred constants are also exempted from this test because |
| 2611 | -- their completion is explicit, or through an import pragma. | |
| 1ce1f005 | 2612 | |
| 4fec4e7a ES |
2613 | if Ekind (E) = E_Constant |
| 2614 | and then Present (Full_View (E)) | |
| 2615 | then | |
| 2616 | null; | |
| 2617 | ||
| 2618 | elsif Comes_From_Source (E) | |
| b6e209b5 | 2619 | and then not Is_Imported (E) |
| 1ce1f005 GD |
2620 | and then not Has_Init_Expression (Declaration_Node (E)) |
| 2621 | and then | |
| 2622 | ((Has_Non_Null_Base_Init_Proc (Etype (E)) | |
| 2623 | and then not No_Initialization (Declaration_Node (E)) | |
| 2624 | and then not Is_Value_Type (Etype (E)) | |
| 2625 | and then not Suppress_Init_Proc (Etype (E))) | |
| 2626 | or else | |
| 2627 | (Needs_Simple_Initialization (Etype (E)) | |
| 2628 | and then not Is_Internal (E))) | |
| 2629 | then | |
| 4c8a5bb8 | 2630 | Has_Default_Initialization := True; |
| 1ce1f005 GD |
2631 | Check_Restriction |
| 2632 | (No_Default_Initialization, Declaration_Node (E)); | |
| 2633 | end if; | |
| 2634 | ||
| 4c8a5bb8 AC |
2635 | -- Check that a Thread_Local_Storage variable does not have |
| 2636 | -- default initialization, and any explicit initialization must | |
| 2637 | -- either be the null constant or a static constant. | |
| 2638 | ||
| 2639 | if Has_Pragma_Thread_Local_Storage (E) then | |
| 2640 | declare | |
| 2641 | Decl : constant Node_Id := Declaration_Node (E); | |
| 2642 | begin | |
| 2643 | if Has_Default_Initialization | |
| 2644 | or else | |
| 2645 | (Has_Init_Expression (Decl) | |
| 2646 | and then | |
| 2647 | (No (Expression (Decl)) | |
| 2648 | or else not | |
| 2649 | (Is_Static_Expression (Expression (Decl)) | |
| 2650 | or else | |
| 2651 | Nkind (Expression (Decl)) = N_Null))) | |
| 2652 | then | |
| 2653 | Error_Msg_NE | |
| 2654 | ("Thread_Local_Storage variable& is " | |
| 2655 | & "improperly initialized", Decl, E); | |
| 2656 | Error_Msg_NE | |
| 2657 | ("\only allowed initialization is explicit " | |
| 2658 | & "NULL or static expression", Decl, E); | |
| 2659 | end if; | |
| 2660 | end; | |
| 2661 | end if; | |
| 2662 | ||
| def46b54 RD |
2663 | -- For imported objects, set Is_Public unless there is also an |
| 2664 | -- address clause, which means that there is no external symbol | |
| 2665 | -- needed for the Import (Is_Public may still be set for other | |
| 2666 | -- unrelated reasons). Note that we delayed this processing | |
| 2667 | -- till freeze time so that we can be sure not to set the flag | |
| 2668 | -- if there is an address clause. If there is such a clause, | |
| 2669 | -- then the only purpose of the Import pragma is to suppress | |
| 2670 | -- implicit initialization. | |
| 2c9beb8a RD |
2671 | |
| 2672 | if Is_Imported (E) | |
| add9f797 | 2673 | and then No (Address_Clause (E)) |
| 2c9beb8a RD |
2674 | then |
| 2675 | Set_Is_Public (E); | |
| 2676 | end if; | |
| 7d8b9c99 RD |
2677 | |
| 2678 | -- For convention C objects of an enumeration type, warn if | |
| 2679 | -- the size is not integer size and no explicit size given. | |
| 2680 | -- Skip warning for Boolean, and Character, assume programmer | |
| 2681 | -- expects 8-bit sizes for these cases. | |
| 2682 | ||
| 2683 | if (Convention (E) = Convention_C | |
| 2684 | or else | |
| 2685 | Convention (E) = Convention_CPP) | |
| 2686 | and then Is_Enumeration_Type (Etype (E)) | |
| 2687 | and then not Is_Character_Type (Etype (E)) | |
| 2688 | and then not Is_Boolean_Type (Etype (E)) | |
| 2689 | and then Esize (Etype (E)) < Standard_Integer_Size | |
| 2690 | and then not Has_Size_Clause (E) | |
| 2691 | then | |
| 2692 | Error_Msg_Uint_1 := UI_From_Int (Standard_Integer_Size); | |
| 2693 | Error_Msg_N | |
| 2694 | ("?convention C enumeration object has size less than ^", | |
| 2695 | E); | |
| 2696 | Error_Msg_N ("\?use explicit size clause to set size", E); | |
| 2697 | end if; | |
| 70482933 RK |
2698 | end if; |
| 2699 | ||
| 2700 | -- Check that a constant which has a pragma Volatile[_Components] | |
| 7d8b9c99 | 2701 | -- or Atomic[_Components] also has a pragma Import (RM C.6(13)). |
| 70482933 RK |
2702 | |
| 2703 | -- Note: Atomic[_Components] also sets Volatile[_Components] | |
| 2704 | ||
| 2705 | if Ekind (E) = E_Constant | |
| 2706 | and then (Has_Volatile_Components (E) or else Is_Volatile (E)) | |
| 2707 | and then not Is_Imported (E) | |
| 2708 | then | |
| 2709 | -- Make sure we actually have a pragma, and have not merely | |
| 2710 | -- inherited the indication from elsewhere (e.g. an address | |
| 2711 | -- clause, which is not good enough in RM terms!) | |
| 2712 | ||
| 1d571f3b | 2713 | if Has_Rep_Pragma (E, Name_Atomic) |
| 91b1417d | 2714 | or else |
| 1d571f3b | 2715 | Has_Rep_Pragma (E, Name_Atomic_Components) |
| 70482933 RK |
2716 | then |
| 2717 | Error_Msg_N | |
| 91b1417d | 2718 | ("stand alone atomic constant must be " & |
| def46b54 | 2719 | "imported (RM C.6(13))", E); |
| 91b1417d | 2720 | |
| 1d571f3b | 2721 | elsif Has_Rep_Pragma (E, Name_Volatile) |
| 91b1417d | 2722 | or else |
| 1d571f3b | 2723 | Has_Rep_Pragma (E, Name_Volatile_Components) |
| 91b1417d AC |
2724 | then |
| 2725 | Error_Msg_N | |
| 2726 | ("stand alone volatile constant must be " & | |
| 86cde7b1 | 2727 | "imported (RM C.6(13))", E); |
| 70482933 RK |
2728 | end if; |
| 2729 | end if; | |
| 2730 | ||
| 2731 | -- Static objects require special handling | |
| 2732 | ||
| 2733 | if (Ekind (E) = E_Constant or else Ekind (E) = E_Variable) | |
| 2734 | and then Is_Statically_Allocated (E) | |
| 2735 | then | |
| 2736 | Freeze_Static_Object (E); | |
| 2737 | end if; | |
| 2738 | ||
| 2739 | -- Remaining step is to layout objects | |
| 2740 | ||
| 2741 | if Ekind (E) = E_Variable | |
| 2742 | or else | |
| 2743 | Ekind (E) = E_Constant | |
| 2744 | or else | |
| 2745 | Ekind (E) = E_Loop_Parameter | |
| 2746 | or else | |
| 2747 | Is_Formal (E) | |
| 2748 | then | |
| 2749 | Layout_Object (E); | |
| 2750 | end if; | |
| 2751 | end if; | |
| 2752 | ||
| 2753 | -- Case of a type or subtype being frozen | |
| 2754 | ||
| 2755 | else | |
| 31b5873d GD |
2756 | -- We used to check here that a full type must have preelaborable |
| 2757 | -- initialization if it completes a private type specified with | |
| 2758 | -- pragma Preelaborable_Intialization, but that missed cases where | |
| 2759 | -- the types occur within a generic package, since the freezing | |
| 2760 | -- that occurs within a containing scope generally skips traversal | |
| 2761 | -- of a generic unit's declarations (those will be frozen within | |
| 2762 | -- instances). This check was moved to Analyze_Package_Specification. | |
| 3f1ede06 | 2763 | |
| 70482933 RK |
2764 | -- The type may be defined in a generic unit. This can occur when |
| 2765 | -- freezing a generic function that returns the type (which is | |
| 2766 | -- defined in a parent unit). It is clearly meaningless to freeze | |
| 2767 | -- this type. However, if it is a subtype, its size may be determi- | |
| 2768 | -- nable and used in subsequent checks, so might as well try to | |
| 2769 | -- compute it. | |
| 2770 | ||
| 2771 | if Present (Scope (E)) | |
| 2772 | and then Is_Generic_Unit (Scope (E)) | |
| 2773 | then | |
| 2774 | Check_Compile_Time_Size (E); | |
| 2775 | return No_List; | |
| 2776 | end if; | |
| 2777 | ||
| 2778 | -- Deal with special cases of freezing for subtype | |
| 2779 | ||
| 2780 | if E /= Base_Type (E) then | |
| 2781 | ||
| 86cde7b1 RD |
2782 | -- Before we do anything else, a specialized test for the case of |
| 2783 | -- a size given for an array where the array needs to be packed, | |
| 2784 | -- but was not so the size cannot be honored. This would of course | |
| 2785 | -- be caught by the backend, and indeed we don't catch all cases. | |
| 2786 | -- The point is that we can give a better error message in those | |
| 2787 | -- cases that we do catch with the circuitry here. Also if pragma | |
| 2788 | -- Implicit_Packing is set, this is where the packing occurs. | |
| 2789 | ||
| 2790 | -- The reason we do this so early is that the processing in the | |
| 2791 | -- automatic packing case affects the layout of the base type, so | |
| 2792 | -- it must be done before we freeze the base type. | |
| 2793 | ||
| 2794 | if Is_Array_Type (E) then | |
| 2795 | declare | |
| 2796 | Lo, Hi : Node_Id; | |
| 2797 | Ctyp : constant Entity_Id := Component_Type (E); | |
| 2798 | ||
| 2799 | begin | |
| 2800 | -- Check enabling conditions. These are straightforward | |
| 2801 | -- except for the test for a limited composite type. This | |
| 2802 | -- eliminates the rare case of a array of limited components | |
| 2803 | -- where there are issues of whether or not we can go ahead | |
| 2804 | -- and pack the array (since we can't freely pack and unpack | |
| 2805 | -- arrays if they are limited). | |
| 2806 | ||
| 2807 | -- Note that we check the root type explicitly because the | |
| 2808 | -- whole point is we are doing this test before we have had | |
| 2809 | -- a chance to freeze the base type (and it is that freeze | |
| 2810 | -- action that causes stuff to be inherited). | |
| 2811 | ||
| 2812 | if Present (Size_Clause (E)) | |
| 2813 | and then Known_Static_Esize (E) | |
| 2814 | and then not Is_Packed (E) | |
| 2815 | and then not Has_Pragma_Pack (E) | |
| 2816 | and then Number_Dimensions (E) = 1 | |
| 2817 | and then not Has_Component_Size_Clause (E) | |
| 2818 | and then Known_Static_Esize (Ctyp) | |
| 2819 | and then not Is_Limited_Composite (E) | |
| 2820 | and then not Is_Packed (Root_Type (E)) | |
| 2821 | and then not Has_Component_Size_Clause (Root_Type (E)) | |
| 2822 | then | |
| 2823 | Get_Index_Bounds (First_Index (E), Lo, Hi); | |
| 2824 | ||
| 2825 | if Compile_Time_Known_Value (Lo) | |
| 2826 | and then Compile_Time_Known_Value (Hi) | |
| 2827 | and then Known_Static_RM_Size (Ctyp) | |
| 2828 | and then RM_Size (Ctyp) < 64 | |
| 2829 | then | |
| 2830 | declare | |
| 2831 | Lov : constant Uint := Expr_Value (Lo); | |
| 2832 | Hiv : constant Uint := Expr_Value (Hi); | |
| 2833 | Len : constant Uint := UI_Max | |
| 2834 | (Uint_0, | |
| 2835 | Hiv - Lov + 1); | |
| 2836 | Rsiz : constant Uint := RM_Size (Ctyp); | |
| 2837 | SZ : constant Node_Id := Size_Clause (E); | |
| 2838 | Btyp : constant Entity_Id := Base_Type (E); | |
| 2839 | ||
| 2840 | -- What we are looking for here is the situation where | |
| 2841 | -- the RM_Size given would be exactly right if there | |
| 2842 | -- was a pragma Pack (resulting in the component size | |
| 2843 | -- being the same as the RM_Size). Furthermore, the | |
| 2844 | -- component type size must be an odd size (not a | |
| 2845 | -- multiple of storage unit) | |
| 2846 | ||
| 2847 | begin | |
| 2848 | if RM_Size (E) = Len * Rsiz | |
| 2849 | and then Rsiz mod System_Storage_Unit /= 0 | |
| 2850 | then | |
| 2851 | -- For implicit packing mode, just set the | |
| fd366a46 | 2852 | -- component size silently. |
| 86cde7b1 RD |
2853 | |
| 2854 | if Implicit_Packing then | |
| 2855 | Set_Component_Size (Btyp, Rsiz); | |
| 2856 | Set_Is_Bit_Packed_Array (Btyp); | |
| 2857 | Set_Is_Packed (Btyp); | |
| 2858 | Set_Has_Non_Standard_Rep (Btyp); | |
| 2859 | ||
| 2860 | -- Otherwise give an error message | |
| 2861 | ||
| 2862 | else | |
| 2863 | Error_Msg_NE | |
| 2864 | ("size given for& too small", SZ, E); | |
| 2865 | Error_Msg_N | |
| 2866 | ("\use explicit pragma Pack " | |
| 2867 | & "or use pragma Implicit_Packing", SZ); | |
| 2868 | end if; | |
| 2869 | end if; | |
| 2870 | end; | |
| 2871 | end if; | |
| 2872 | end if; | |
| 2873 | end; | |
| 2874 | end if; | |
| 2875 | ||
| def46b54 RD |
2876 | -- If ancestor subtype present, freeze that first. Note that this |
| 2877 | -- will also get the base type frozen. | |
| 70482933 RK |
2878 | |
| 2879 | Atype := Ancestor_Subtype (E); | |
| 2880 | ||
| 2881 | if Present (Atype) then | |
| 2882 | Freeze_And_Append (Atype, Loc, Result); | |
| 2883 | ||
| def46b54 RD |
2884 | -- Otherwise freeze the base type of the entity before freezing |
| 2885 | -- the entity itself (RM 13.14(15)). | |
| 70482933 RK |
2886 | |
| 2887 | elsif E /= Base_Type (E) then | |
| 2888 | Freeze_And_Append (Base_Type (E), Loc, Result); | |
| 2889 | end if; | |
| 2890 | ||
| fbf5a39b | 2891 | -- For a derived type, freeze its parent type first (RM 13.14(15)) |
| 70482933 RK |
2892 | |
| 2893 | elsif Is_Derived_Type (E) then | |
| 2894 | Freeze_And_Append (Etype (E), Loc, Result); | |
| 2895 | Freeze_And_Append (First_Subtype (Etype (E)), Loc, Result); | |
| 2896 | end if; | |
| 2897 | ||
| 2898 | -- For array type, freeze index types and component type first | |
| fbf5a39b | 2899 | -- before freezing the array (RM 13.14(15)). |
| 70482933 RK |
2900 | |
| 2901 | if Is_Array_Type (E) then | |
| 2902 | declare | |
| fbf5a39b | 2903 | Ctyp : constant Entity_Id := Component_Type (E); |
| 70482933 RK |
2904 | |
| 2905 | Non_Standard_Enum : Boolean := False; | |
| 7d8b9c99 RD |
2906 | -- Set true if any of the index types is an enumeration type |
| 2907 | -- with a non-standard representation. | |
| 70482933 RK |
2908 | |
| 2909 | begin | |
| 2910 | Freeze_And_Append (Ctyp, Loc, Result); | |
| 2911 | ||
| 2912 | Indx := First_Index (E); | |
| 2913 | while Present (Indx) loop | |
| 2914 | Freeze_And_Append (Etype (Indx), Loc, Result); | |
| 2915 | ||
| 2916 | if Is_Enumeration_Type (Etype (Indx)) | |
| 2917 | and then Has_Non_Standard_Rep (Etype (Indx)) | |
| 2918 | then | |
| 2919 | Non_Standard_Enum := True; | |
| 2920 | end if; | |
| 2921 | ||
| 2922 | Next_Index (Indx); | |
| 2923 | end loop; | |
| 2924 | ||
| 07fc65c4 | 2925 | -- Processing that is done only for base types |
| 70482933 RK |
2926 | |
| 2927 | if Ekind (E) = E_Array_Type then | |
| 07fc65c4 GB |
2928 | |
| 2929 | -- Propagate flags for component type | |
| 2930 | ||
| 70482933 RK |
2931 | if Is_Controlled (Component_Type (E)) |
| 2932 | or else Has_Controlled_Component (Ctyp) | |
| 2933 | then | |
| 2934 | Set_Has_Controlled_Component (E); | |
| 2935 | end if; | |
| 2936 | ||
| 2937 | if Has_Unchecked_Union (Component_Type (E)) then | |
| 2938 | Set_Has_Unchecked_Union (E); | |
| 2939 | end if; | |
| 70482933 | 2940 | |
| 07fc65c4 GB |
2941 | -- If packing was requested or if the component size was set |
| 2942 | -- explicitly, then see if bit packing is required. This | |
| 2943 | -- processing is only done for base types, since all the | |
| 2944 | -- representation aspects involved are type-related. This | |
| 2945 | -- is not just an optimization, if we start processing the | |
| e14c931f | 2946 | -- subtypes, they interfere with the settings on the base |
| 07fc65c4 GB |
2947 | -- type (this is because Is_Packed has a slightly different |
| 2948 | -- meaning before and after freezing). | |
| 70482933 | 2949 | |
| 70482933 RK |
2950 | declare |
| 2951 | Csiz : Uint; | |
| 2952 | Esiz : Uint; | |
| 2953 | ||
| 2954 | begin | |
| 2955 | if (Is_Packed (E) or else Has_Pragma_Pack (E)) | |
| 2956 | and then not Has_Atomic_Components (E) | |
| 2957 | and then Known_Static_RM_Size (Ctyp) | |
| 2958 | then | |
| 2959 | Csiz := UI_Max (RM_Size (Ctyp), 1); | |
| 2960 | ||
| 2961 | elsif Known_Component_Size (E) then | |
| 2962 | Csiz := Component_Size (E); | |
| 2963 | ||
| 2964 | elsif not Known_Static_Esize (Ctyp) then | |
| 2965 | Csiz := Uint_0; | |
| 2966 | ||
| 2967 | else | |
| 2968 | Esiz := Esize (Ctyp); | |
| 2969 | ||
| 2970 | -- We can set the component size if it is less than | |
| 2971 | -- 16, rounding it up to the next storage unit size. | |
| 2972 | ||
| 2973 | if Esiz <= 8 then | |
| 2974 | Csiz := Uint_8; | |
| 2975 | elsif Esiz <= 16 then | |
| 2976 | Csiz := Uint_16; | |
| 2977 | else | |
| 2978 | Csiz := Uint_0; | |
| 2979 | end if; | |
| 2980 | ||
| 7d8b9c99 RD |
2981 | -- Set component size up to match alignment if it |
| 2982 | -- would otherwise be less than the alignment. This | |
| 2983 | -- deals with cases of types whose alignment exceeds | |
| 2984 | -- their size (padded types). | |
| 70482933 RK |
2985 | |
| 2986 | if Csiz /= 0 then | |
| 2987 | declare | |
| 2988 | A : constant Uint := Alignment_In_Bits (Ctyp); | |
| 70482933 RK |
2989 | begin |
| 2990 | if Csiz < A then | |
| 2991 | Csiz := A; | |
| 2992 | end if; | |
| 2993 | end; | |
| 2994 | end if; | |
| 70482933 RK |
2995 | end if; |
| 2996 | ||
| 86cde7b1 RD |
2997 | -- Case of component size that may result in packing |
| 2998 | ||
| 70482933 | 2999 | if 1 <= Csiz and then Csiz <= 64 then |
| 86cde7b1 RD |
3000 | declare |
| 3001 | Ent : constant Entity_Id := | |
| 3002 | First_Subtype (E); | |
| 3003 | Pack_Pragma : constant Node_Id := | |
| 3004 | Get_Rep_Pragma (Ent, Name_Pack); | |
| 3005 | Comp_Size_C : constant Node_Id := | |
| 3006 | Get_Attribute_Definition_Clause | |
| 3007 | (Ent, Attribute_Component_Size); | |
| 3008 | begin | |
| 3009 | -- Warn if we have pack and component size so that | |
| 3010 | -- the pack is ignored. | |
| 70482933 | 3011 | |
| 86cde7b1 RD |
3012 | -- Note: here we must check for the presence of a |
| 3013 | -- component size before checking for a Pack pragma | |
| 3014 | -- to deal with the case where the array type is a | |
| 3015 | -- derived type whose parent is currently private. | |
| 3016 | ||
| 3017 | if Present (Comp_Size_C) | |
| 3018 | and then Has_Pragma_Pack (Ent) | |
| 3019 | then | |
| 3020 | Error_Msg_Sloc := Sloc (Comp_Size_C); | |
| 3021 | Error_Msg_NE | |
| 3022 | ("?pragma Pack for& ignored!", | |
| 3023 | Pack_Pragma, Ent); | |
| 3024 | Error_Msg_N | |
| 3025 | ("\?explicit component size given#!", | |
| 3026 | Pack_Pragma); | |
| 3027 | end if; | |
| 70482933 | 3028 | |
| 86cde7b1 RD |
3029 | -- Set component size if not already set by a |
| 3030 | -- component size clause. | |
| 70482933 | 3031 | |
| 86cde7b1 RD |
3032 | if not Present (Comp_Size_C) then |
| 3033 | Set_Component_Size (E, Csiz); | |
| 3034 | end if; | |
| fbf5a39b | 3035 | |
| 86cde7b1 RD |
3036 | -- Check for base type of 8, 16, 32 bits, where an |
| 3037 | -- unsigned subtype has a length one less than the | |
| 3038 | -- base type (e.g. Natural subtype of Integer). | |
| fbf5a39b | 3039 | |
| 86cde7b1 RD |
3040 | -- In such cases, if a component size was not set |
| 3041 | -- explicitly, then generate a warning. | |
| fbf5a39b | 3042 | |
| 86cde7b1 RD |
3043 | if Has_Pragma_Pack (E) |
| 3044 | and then not Present (Comp_Size_C) | |
| 3045 | and then | |
| 3046 | (Csiz = 7 or else Csiz = 15 or else Csiz = 31) | |
| 3047 | and then Esize (Base_Type (Ctyp)) = Csiz + 1 | |
| 3048 | then | |
| 3049 | Error_Msg_Uint_1 := Csiz; | |
| 3050 | ||
| 3051 | if Present (Pack_Pragma) then | |
| 3052 | Error_Msg_N | |
| 3053 | ("?pragma Pack causes component size " | |
| 3054 | & "to be ^!", Pack_Pragma); | |
| 3055 | Error_Msg_N | |
| 3056 | ("\?use Component_Size to set " | |
| 3057 | & "desired value!", Pack_Pragma); | |
| 3058 | end if; | |
| fbf5a39b | 3059 | end if; |
| fbf5a39b | 3060 | |
| 86cde7b1 RD |
3061 | -- Actual packing is not needed for 8, 16, 32, 64. |
| 3062 | -- Also not needed for 24 if alignment is 1. | |
| 70482933 | 3063 | |
| 86cde7b1 RD |
3064 | if Csiz = 8 |
| 3065 | or else Csiz = 16 | |
| 3066 | or else Csiz = 32 | |
| 3067 | or else Csiz = 64 | |
| 3068 | or else (Csiz = 24 and then Alignment (Ctyp) = 1) | |
| 3069 | then | |
| 3070 | -- Here the array was requested to be packed, | |
| 3071 | -- but the packing request had no effect, so | |
| 3072 | -- Is_Packed is reset. | |
| 70482933 | 3073 | |
| 86cde7b1 RD |
3074 | -- Note: semantically this means that we lose |
| 3075 | -- track of the fact that a derived type | |
| 3076 | -- inherited a pragma Pack that was non- | |
| 3077 | -- effective, but that seems fine. | |
| 70482933 | 3078 | |
| 86cde7b1 RD |
3079 | -- We regard a Pack pragma as a request to set |
| 3080 | -- a representation characteristic, and this | |
| 3081 | -- request may be ignored. | |
| 70482933 | 3082 | |
| 86cde7b1 | 3083 | Set_Is_Packed (Base_Type (E), False); |
| 70482933 | 3084 | |
| 86cde7b1 | 3085 | -- In all other cases, packing is indeed needed |
| 70482933 | 3086 | |
| 86cde7b1 RD |
3087 | else |
| 3088 | Set_Has_Non_Standard_Rep (Base_Type (E)); | |
| 3089 | Set_Is_Bit_Packed_Array (Base_Type (E)); | |
| 3090 | Set_Is_Packed (Base_Type (E)); | |
| 3091 | end if; | |
| 3092 | end; | |
| 70482933 RK |
3093 | end if; |
| 3094 | end; | |
| 07fc65c4 GB |
3095 | |
| 3096 | -- Processing that is done only for subtypes | |
| 3097 | ||
| 3098 | else | |
| 3099 | -- Acquire alignment from base type | |
| 3100 | ||
| 3101 | if Unknown_Alignment (E) then | |
| 3102 | Set_Alignment (E, Alignment (Base_Type (E))); | |
| 7d8b9c99 | 3103 | Adjust_Esize_Alignment (E); |
| 07fc65c4 GB |
3104 | end if; |
| 3105 | end if; | |
| 3106 | ||
| d05ef0ab AC |
3107 | -- For bit-packed arrays, check the size |
| 3108 | ||
| 3109 | if Is_Bit_Packed_Array (E) | |
| 7d8b9c99 | 3110 | and then Known_RM_Size (E) |
| d05ef0ab AC |
3111 | then |
| 3112 | declare | |
| 67ce0d7e RD |
3113 | SizC : constant Node_Id := Size_Clause (E); |
| 3114 | ||
| d05ef0ab | 3115 | Discard : Boolean; |
| 67ce0d7e | 3116 | pragma Warnings (Off, Discard); |
| d05ef0ab AC |
3117 | |
| 3118 | begin | |
| 3119 | -- It is not clear if it is possible to have no size | |
| 7d8b9c99 RD |
3120 | -- clause at this stage, but it is not worth worrying |
| 3121 | -- about. Post error on the entity name in the size | |
| d05ef0ab AC |
3122 | -- clause if present, else on the type entity itself. |
| 3123 | ||
| 3124 | if Present (SizC) then | |
| 7d8b9c99 | 3125 | Check_Size (Name (SizC), E, RM_Size (E), Discard); |
| d05ef0ab | 3126 | else |
| 7d8b9c99 | 3127 | Check_Size (E, E, RM_Size (E), Discard); |
| d05ef0ab AC |
3128 | end if; |
| 3129 | end; | |
| 3130 | end if; | |
| 3131 | ||
| 70482933 RK |
3132 | -- If any of the index types was an enumeration type with |
| 3133 | -- a non-standard rep clause, then we indicate that the | |
| 3134 | -- array type is always packed (even if it is not bit packed). | |
| 3135 | ||
| 3136 | if Non_Standard_Enum then | |
| 3137 | Set_Has_Non_Standard_Rep (Base_Type (E)); | |
| 3138 | Set_Is_Packed (Base_Type (E)); | |
| 3139 | end if; | |
| 70482933 | 3140 | |
| 0da2c8ac | 3141 | Set_Component_Alignment_If_Not_Set (E); |
| 70482933 | 3142 | |
| 0da2c8ac AC |
3143 | -- If the array is packed, we must create the packed array |
| 3144 | -- type to be used to actually implement the type. This is | |
| 3145 | -- only needed for real array types (not for string literal | |
| 3146 | -- types, since they are present only for the front end). | |
| 70482933 | 3147 | |
| 0da2c8ac AC |
3148 | if Is_Packed (E) |
| 3149 | and then Ekind (E) /= E_String_Literal_Subtype | |
| 3150 | then | |
| 3151 | Create_Packed_Array_Type (E); | |
| 3152 | Freeze_And_Append (Packed_Array_Type (E), Loc, Result); | |
| 70482933 | 3153 | |
| 0da2c8ac | 3154 | -- Size information of packed array type is copied to the |
| fea9e956 | 3155 | -- array type, since this is really the representation. But |
| def46b54 RD |
3156 | -- do not override explicit existing size values. If the |
| 3157 | -- ancestor subtype is constrained the packed_array_type | |
| 3158 | -- will be inherited from it, but the size may have been | |
| 3159 | -- provided already, and must not be overridden either. | |
| fea9e956 | 3160 | |
| def46b54 RD |
3161 | if not Has_Size_Clause (E) |
| 3162 | and then | |
| 3163 | (No (Ancestor_Subtype (E)) | |
| 3164 | or else not Has_Size_Clause (Ancestor_Subtype (E))) | |
| 3165 | then | |
| fea9e956 ES |
3166 | Set_Esize (E, Esize (Packed_Array_Type (E))); |
| 3167 | Set_RM_Size (E, RM_Size (Packed_Array_Type (E))); | |
| 3168 | end if; | |
| 70482933 | 3169 | |
| fea9e956 ES |
3170 | if not Has_Alignment_Clause (E) then |
| 3171 | Set_Alignment (E, Alignment (Packed_Array_Type (E))); | |
| 3172 | end if; | |
| 0da2c8ac AC |
3173 | end if; |
| 3174 | ||
| def46b54 RD |
3175 | -- For non-packed arrays set the alignment of the array to the |
| 3176 | -- alignment of the component type if it is unknown. Skip this | |
| 3177 | -- in atomic case (atomic arrays may need larger alignments). | |
| 0da2c8ac AC |
3178 | |
| 3179 | if not Is_Packed (E) | |
| 3180 | and then Unknown_Alignment (E) | |
| 3181 | and then Known_Alignment (Ctyp) | |
| 3182 | and then Known_Static_Component_Size (E) | |
| 3183 | and then Known_Static_Esize (Ctyp) | |
| 3184 | and then Esize (Ctyp) = Component_Size (E) | |
| 3185 | and then not Is_Atomic (E) | |
| 3186 | then | |
| 3187 | Set_Alignment (E, Alignment (Component_Type (E))); | |
| 3188 | end if; | |
| 3189 | end; | |
| 70482933 | 3190 | |
| fbf5a39b AC |
3191 | -- For a class-wide type, the corresponding specific type is |
| 3192 | -- frozen as well (RM 13.14(15)) | |
| 70482933 RK |
3193 | |
| 3194 | elsif Is_Class_Wide_Type (E) then | |
| 3195 | Freeze_And_Append (Root_Type (E), Loc, Result); | |
| 3196 | ||
| 86cde7b1 RD |
3197 | -- If the base type of the class-wide type is still incomplete, |
| 3198 | -- the class-wide remains unfrozen as well. This is legal when | |
| 3199 | -- E is the formal of a primitive operation of some other type | |
| 3200 | -- which is being frozen. | |
| 3201 | ||
| 3202 | if not Is_Frozen (Root_Type (E)) then | |
| 3203 | Set_Is_Frozen (E, False); | |
| 3204 | return Result; | |
| 3205 | end if; | |
| 3206 | ||
| 70482933 RK |
3207 | -- If the Class_Wide_Type is an Itype (when type is the anonymous |
| 3208 | -- parent of a derived type) and it is a library-level entity, | |
| 3209 | -- generate an itype reference for it. Otherwise, its first | |
| 3210 | -- explicit reference may be in an inner scope, which will be | |
| 3211 | -- rejected by the back-end. | |
| 3212 | ||
| 3213 | if Is_Itype (E) | |
| 3214 | and then Is_Compilation_Unit (Scope (E)) | |
| 3215 | then | |
| 70482933 | 3216 | declare |
| fbf5a39b | 3217 | Ref : constant Node_Id := Make_Itype_Reference (Loc); |
| 70482933 RK |
3218 | |
| 3219 | begin | |
| 3220 | Set_Itype (Ref, E); | |
| 3221 | if No (Result) then | |
| 3222 | Result := New_List (Ref); | |
| 3223 | else | |
| 3224 | Append (Ref, Result); | |
| 3225 | end if; | |
| 3226 | end; | |
| 3227 | end if; | |
| 3228 | ||
| def46b54 RD |
3229 | -- The equivalent type associated with a class-wide subtype needs |
| 3230 | -- to be frozen to ensure that its layout is done. Class-wide | |
| 3231 | -- subtypes are currently only frozen on targets requiring | |
| 3232 | -- front-end layout (see New_Class_Wide_Subtype and | |
| 3233 | -- Make_CW_Equivalent_Type in exp_util.adb). | |
| fbf5a39b AC |
3234 | |
| 3235 | if Ekind (E) = E_Class_Wide_Subtype | |
| 3236 | and then Present (Equivalent_Type (E)) | |
| 3237 | then | |
| 3238 | Freeze_And_Append (Equivalent_Type (E), Loc, Result); | |
| 3239 | end if; | |
| 3240 | ||
| 3241 | -- For a record (sub)type, freeze all the component types (RM | |
| def46b54 RD |
3242 | -- 13.14(15). We test for E_Record_(sub)Type here, rather than using |
| 3243 | -- Is_Record_Type, because we don't want to attempt the freeze for | |
| 3244 | -- the case of a private type with record extension (we will do that | |
| 3245 | -- later when the full type is frozen). | |
| 70482933 RK |
3246 | |
| 3247 | elsif Ekind (E) = E_Record_Type | |
| fd366a46 | 3248 | or else Ekind (E) = E_Record_Subtype |
| 70482933 RK |
3249 | then |
| 3250 | Freeze_Record_Type (E); | |
| 3251 | ||
| 3252 | -- For a concurrent type, freeze corresponding record type. This | |
| e14c931f | 3253 | -- does not correspond to any specific rule in the RM, but the |
| 70482933 RK |
3254 | -- record type is essentially part of the concurrent type. |
| 3255 | -- Freeze as well all local entities. This includes record types | |
| 3256 | -- created for entry parameter blocks, and whatever local entities | |
| 3257 | -- may appear in the private part. | |
| 3258 | ||
| 3259 | elsif Is_Concurrent_Type (E) then | |
| 3260 | if Present (Corresponding_Record_Type (E)) then | |
| 3261 | Freeze_And_Append | |
| 3262 | (Corresponding_Record_Type (E), Loc, Result); | |
| 3263 | end if; | |
| 3264 | ||
| 3265 | Comp := First_Entity (E); | |
| 70482933 RK |
3266 | while Present (Comp) loop |
| 3267 | if Is_Type (Comp) then | |
| 3268 | Freeze_And_Append (Comp, Loc, Result); | |
| 3269 | ||
| 3270 | elsif (Ekind (Comp)) /= E_Function then | |
| c6823a20 EB |
3271 | if Is_Itype (Etype (Comp)) |
| 3272 | and then Underlying_Type (Scope (Etype (Comp))) = E | |
| 3273 | then | |
| 3274 | Undelay_Type (Etype (Comp)); | |
| 3275 | end if; | |
| 3276 | ||
| 70482933 RK |
3277 | Freeze_And_Append (Etype (Comp), Loc, Result); |
| 3278 | end if; | |
| 3279 | ||
| 3280 | Next_Entity (Comp); | |
| 3281 | end loop; | |
| 3282 | ||
| ee094616 RD |
3283 | -- Private types are required to point to the same freeze node as |
| 3284 | -- their corresponding full views. The freeze node itself has to | |
| 3285 | -- point to the partial view of the entity (because from the partial | |
| 3286 | -- view, we can retrieve the full view, but not the reverse). | |
| 3287 | -- However, in order to freeze correctly, we need to freeze the full | |
| 3288 | -- view. If we are freezing at the end of a scope (or within the | |
| 3289 | -- scope of the private type), the partial and full views will have | |
| 3290 | -- been swapped, the full view appears first in the entity chain and | |
| 3291 | -- the swapping mechanism ensures that the pointers are properly set | |
| 3292 | -- (on scope exit). | |
| 3293 | ||
| 3294 | -- If we encounter the partial view before the full view (e.g. when | |
| 3295 | -- freezing from another scope), we freeze the full view, and then | |
| 3296 | -- set the pointers appropriately since we cannot rely on swapping to | |
| 3297 | -- fix things up (subtypes in an outer scope might not get swapped). | |
| 70482933 RK |
3298 | |
| 3299 | elsif Is_Incomplete_Or_Private_Type (E) | |
| 3300 | and then not Is_Generic_Type (E) | |
| 3301 | then | |
| 86cde7b1 RD |
3302 | -- The construction of the dispatch table associated with library |
| 3303 | -- level tagged types forces freezing of all the primitives of the | |
| 3304 | -- type, which may cause premature freezing of the partial view. | |
| 3305 | -- For example: | |
| 3306 | ||
| 3307 | -- package Pkg is | |
| 3308 | -- type T is tagged private; | |
| 3309 | -- type DT is new T with private; | |
| 3310 | -- procedure Prim (X : in out T; Y : in out DT'class); | |
| 3311 | -- private | |
| 3312 | -- type T is tagged null record; | |
| 3313 | -- Obj : T; | |
| 3314 | -- type DT is new T with null record; | |
| 3315 | -- end; | |
| 3316 | ||
| 3317 | -- In this case the type will be frozen later by the usual | |
| 3318 | -- mechanism: an object declaration, an instantiation, or the | |
| 3319 | -- end of a declarative part. | |
| 3320 | ||
| 3321 | if Is_Library_Level_Tagged_Type (E) | |
| 3322 | and then not Present (Full_View (E)) | |
| 3323 | then | |
| 3324 | Set_Is_Frozen (E, False); | |
| 3325 | return Result; | |
| 3326 | ||
| 70482933 RK |
3327 | -- Case of full view present |
| 3328 | ||
| 86cde7b1 | 3329 | elsif Present (Full_View (E)) then |
| 70482933 | 3330 | |
| ee094616 RD |
3331 | -- If full view has already been frozen, then no further |
| 3332 | -- processing is required | |
| 70482933 RK |
3333 | |
| 3334 | if Is_Frozen (Full_View (E)) then | |
| 3335 | ||
| 3336 | Set_Has_Delayed_Freeze (E, False); | |
| 3337 | Set_Freeze_Node (E, Empty); | |
| 3338 | Check_Debug_Info_Needed (E); | |
| 3339 | ||
| ee094616 RD |
3340 | -- Otherwise freeze full view and patch the pointers so that |
| 3341 | -- the freeze node will elaborate both views in the back-end. | |
| 70482933 RK |
3342 | |
| 3343 | else | |
| fbf5a39b AC |
3344 | declare |
| 3345 | Full : constant Entity_Id := Full_View (E); | |
| 70482933 | 3346 | |
| fbf5a39b AC |
3347 | begin |
| 3348 | if Is_Private_Type (Full) | |
| 3349 | and then Present (Underlying_Full_View (Full)) | |
| 3350 | then | |
| 3351 | Freeze_And_Append | |
| 3352 | (Underlying_Full_View (Full), Loc, Result); | |
| 3353 | end if; | |
| 70482933 | 3354 | |
| fbf5a39b | 3355 | Freeze_And_Append (Full, Loc, Result); |
| 70482933 | 3356 | |
| fbf5a39b AC |
3357 | if Has_Delayed_Freeze (E) then |
| 3358 | F_Node := Freeze_Node (Full); | |
| 70482933 | 3359 | |
| fbf5a39b AC |
3360 | if Present (F_Node) then |
| 3361 | Set_Freeze_Node (E, F_Node); | |
| 3362 | Set_Entity (F_Node, E); | |
| 3363 | ||
| 3364 | else | |
| def46b54 RD |
3365 | -- {Incomplete,Private}_Subtypes with Full_Views |
| 3366 | -- constrained by discriminants. | |
| fbf5a39b AC |
3367 | |
| 3368 | Set_Has_Delayed_Freeze (E, False); | |
| 3369 | Set_Freeze_Node (E, Empty); | |
| 3370 | end if; | |
| 70482933 | 3371 | end if; |
| fbf5a39b | 3372 | end; |
| 70482933 RK |
3373 | |
| 3374 | Check_Debug_Info_Needed (E); | |
| 3375 | end if; | |
| 3376 | ||
| ee094616 RD |
3377 | -- AI-117 requires that the convention of a partial view be the |
| 3378 | -- same as the convention of the full view. Note that this is a | |
| 3379 | -- recognized breach of privacy, but it's essential for logical | |
| 3380 | -- consistency of representation, and the lack of a rule in | |
| 3381 | -- RM95 was an oversight. | |
| 70482933 RK |
3382 | |
| 3383 | Set_Convention (E, Convention (Full_View (E))); | |
| 3384 | ||
| 3385 | Set_Size_Known_At_Compile_Time (E, | |
| 3386 | Size_Known_At_Compile_Time (Full_View (E))); | |
| 3387 | ||
| 3388 | -- Size information is copied from the full view to the | |
| def46b54 | 3389 | -- incomplete or private view for consistency. |
| 70482933 | 3390 | |
| ee094616 RD |
3391 | -- We skip this is the full view is not a type. This is very |
| 3392 | -- strange of course, and can only happen as a result of | |
| 3393 | -- certain illegalities, such as a premature attempt to derive | |
| 3394 | -- from an incomplete type. | |
| 70482933 RK |
3395 | |
| 3396 | if Is_Type (Full_View (E)) then | |
| 3397 | Set_Size_Info (E, Full_View (E)); | |
| 3398 | Set_RM_Size (E, RM_Size (Full_View (E))); | |
| 3399 | end if; | |
| 3400 | ||
| 3401 | return Result; | |
| 3402 | ||
| 3403 | -- Case of no full view present. If entity is derived or subtype, | |
| 3404 | -- it is safe to freeze, correctness depends on the frozen status | |
| 3405 | -- of parent. Otherwise it is either premature usage, or a Taft | |
| 3406 | -- amendment type, so diagnosis is at the point of use and the | |
| 3407 | -- type might be frozen later. | |
| 3408 | ||
| 3409 | elsif E /= Base_Type (E) | |
| 3410 | or else Is_Derived_Type (E) | |
| 3411 | then | |
| 3412 | null; | |
| 3413 | ||
| 3414 | else | |
| 3415 | Set_Is_Frozen (E, False); | |
| 3416 | return No_List; | |
| 3417 | end if; | |
| 3418 | ||
| 3419 | -- For access subprogram, freeze types of all formals, the return | |
| 3420 | -- type was already frozen, since it is the Etype of the function. | |
| 8aec446b | 3421 | -- Formal types can be tagged Taft amendment types, but otherwise |
| 205c14b0 | 3422 | -- they cannot be incomplete. |
| 70482933 RK |
3423 | |
| 3424 | elsif Ekind (E) = E_Subprogram_Type then | |
| 3425 | Formal := First_Formal (E); | |
| 8aec446b | 3426 | |
| 70482933 | 3427 | while Present (Formal) loop |
| 8aec446b AC |
3428 | if Ekind (Etype (Formal)) = E_Incomplete_Type |
| 3429 | and then No (Full_View (Etype (Formal))) | |
| 3430 | and then not Is_Value_Type (Etype (Formal)) | |
| 3431 | then | |
| 3432 | if Is_Tagged_Type (Etype (Formal)) then | |
| 3433 | null; | |
| 3434 | else | |
| 3435 | Error_Msg_NE | |
| 3436 | ("invalid use of incomplete type&", E, Etype (Formal)); | |
| 3437 | end if; | |
| 3438 | end if; | |
| 3439 | ||
| 70482933 RK |
3440 | Freeze_And_Append (Etype (Formal), Loc, Result); |
| 3441 | Next_Formal (Formal); | |
| 3442 | end loop; | |
| 3443 | ||
| 70482933 RK |
3444 | Freeze_Subprogram (E); |
| 3445 | ||
| ee094616 RD |
3446 | -- For access to a protected subprogram, freeze the equivalent type |
| 3447 | -- (however this is not set if we are not generating code or if this | |
| 3448 | -- is an anonymous type used just for resolution). | |
| 70482933 | 3449 | |
| fea9e956 | 3450 | elsif Is_Access_Protected_Subprogram_Type (E) then |
| 57747aec | 3451 | if Present (Equivalent_Type (E)) then |
| d8db0bca JM |
3452 | Freeze_And_Append (Equivalent_Type (E), Loc, Result); |
| 3453 | end if; | |
| 70482933 RK |
3454 | end if; |
| 3455 | ||
| 3456 | -- Generic types are never seen by the back-end, and are also not | |
| 3457 | -- processed by the expander (since the expander is turned off for | |
| 3458 | -- generic processing), so we never need freeze nodes for them. | |
| 3459 | ||
| 3460 | if Is_Generic_Type (E) then | |
| 3461 | return Result; | |
| 3462 | end if; | |
| 3463 | ||
| 3464 | -- Some special processing for non-generic types to complete | |
| 3465 | -- representation details not known till the freeze point. | |
| 3466 | ||
| 3467 | if Is_Fixed_Point_Type (E) then | |
| 3468 | Freeze_Fixed_Point_Type (E); | |
| 3469 | ||
| ee094616 RD |
3470 | -- Some error checks required for ordinary fixed-point type. Defer |
| 3471 | -- these till the freeze-point since we need the small and range | |
| 3472 | -- values. We only do these checks for base types | |
| fbf5a39b AC |
3473 | |
| 3474 | if Is_Ordinary_Fixed_Point_Type (E) | |
| 3475 | and then E = Base_Type (E) | |
| 3476 | then | |
| 3477 | if Small_Value (E) < Ureal_2_M_80 then | |
| 3478 | Error_Msg_Name_1 := Name_Small; | |
| 3479 | Error_Msg_N | |
| 7d8b9c99 | 3480 | ("`&''%` too small, minimum allowed is 2.0'*'*(-80)", E); |
| fbf5a39b AC |
3481 | |
| 3482 | elsif Small_Value (E) > Ureal_2_80 then | |
| 3483 | Error_Msg_Name_1 := Name_Small; | |
| 3484 | Error_Msg_N | |
| 7d8b9c99 | 3485 | ("`&''%` too large, maximum allowed is 2.0'*'*80", E); |
| fbf5a39b AC |
3486 | end if; |
| 3487 | ||
| 3488 | if Expr_Value_R (Type_Low_Bound (E)) < Ureal_M_10_36 then | |
| 3489 | Error_Msg_Name_1 := Name_First; | |
| 3490 | Error_Msg_N | |
| 7d8b9c99 | 3491 | ("`&''%` too small, minimum allowed is -10.0'*'*36", E); |
| fbf5a39b AC |
3492 | end if; |
| 3493 | ||
| 3494 | if Expr_Value_R (Type_High_Bound (E)) > Ureal_10_36 then | |
| 3495 | Error_Msg_Name_1 := Name_Last; | |
| 3496 | Error_Msg_N | |
| 7d8b9c99 | 3497 | ("`&''%` too large, maximum allowed is 10.0'*'*36", E); |
| fbf5a39b AC |
3498 | end if; |
| 3499 | end if; | |
| 3500 | ||
| 70482933 RK |
3501 | elsif Is_Enumeration_Type (E) then |
| 3502 | Freeze_Enumeration_Type (E); | |
| 3503 | ||
| 3504 | elsif Is_Integer_Type (E) then | |
| 3505 | Adjust_Esize_For_Alignment (E); | |
| 3506 | ||
| edd63e9b ES |
3507 | elsif Is_Access_Type (E) then |
| 3508 | ||
| 3509 | -- Check restriction for standard storage pool | |
| 3510 | ||
| 3511 | if No (Associated_Storage_Pool (E)) then | |
| 3512 | Check_Restriction (No_Standard_Storage_Pools, E); | |
| 3513 | end if; | |
| 3514 | ||
| 3515 | -- Deal with error message for pure access type. This is not an | |
| 3516 | -- error in Ada 2005 if there is no pool (see AI-366). | |
| 3517 | ||
| 3518 | if Is_Pure_Unit_Access_Type (E) | |
| 3519 | and then (Ada_Version < Ada_05 | |
| c6a9797e | 3520 | or else not No_Pool_Assigned (E)) |
| edd63e9b ES |
3521 | then |
| 3522 | Error_Msg_N ("named access type not allowed in pure unit", E); | |
| c6a9797e RD |
3523 | |
| 3524 | if Ada_Version >= Ada_05 then | |
| 3525 | Error_Msg_N | |
| 3526 | ("\would be legal if Storage_Size of 0 given?", E); | |
| 3527 | ||
| 3528 | elsif No_Pool_Assigned (E) then | |
| 3529 | Error_Msg_N | |
| 3530 | ("\would be legal in Ada 2005?", E); | |
| 3531 | ||
| 3532 | else | |
| 3533 | Error_Msg_N | |
| 3534 | ("\would be legal in Ada 2005 if " | |
| 3535 | & "Storage_Size of 0 given?", E); | |
| 3536 | end if; | |
| edd63e9b | 3537 | end if; |
| 70482933 RK |
3538 | end if; |
| 3539 | ||
| edd63e9b ES |
3540 | -- Case of composite types |
| 3541 | ||
| 70482933 RK |
3542 | if Is_Composite_Type (E) then |
| 3543 | ||
| edd63e9b ES |
3544 | -- AI-117 requires that all new primitives of a tagged type must |
| 3545 | -- inherit the convention of the full view of the type. Inherited | |
| 3546 | -- and overriding operations are defined to inherit the convention | |
| 3547 | -- of their parent or overridden subprogram (also specified in | |
| ee094616 RD |
3548 | -- AI-117), which will have occurred earlier (in Derive_Subprogram |
| 3549 | -- and New_Overloaded_Entity). Here we set the convention of | |
| 3550 | -- primitives that are still convention Ada, which will ensure | |
| def46b54 RD |
3551 | -- that any new primitives inherit the type's convention. Class- |
| 3552 | -- wide types can have a foreign convention inherited from their | |
| 3553 | -- specific type, but are excluded from this since they don't have | |
| 3554 | -- any associated primitives. | |
| 70482933 RK |
3555 | |
| 3556 | if Is_Tagged_Type (E) | |
| 3557 | and then not Is_Class_Wide_Type (E) | |
| 3558 | and then Convention (E) /= Convention_Ada | |
| 3559 | then | |
| 3560 | declare | |
| 3561 | Prim_List : constant Elist_Id := Primitive_Operations (E); | |
| 07fc65c4 | 3562 | Prim : Elmt_Id; |
| 70482933 | 3563 | begin |
| 07fc65c4 | 3564 | Prim := First_Elmt (Prim_List); |
| 70482933 RK |
3565 | while Present (Prim) loop |
| 3566 | if Convention (Node (Prim)) = Convention_Ada then | |
| 3567 | Set_Convention (Node (Prim), Convention (E)); | |
| 3568 | end if; | |
| 3569 | ||
| 3570 | Next_Elmt (Prim); | |
| 3571 | end loop; | |
| 3572 | end; | |
| 3573 | end if; | |
| 3574 | end if; | |
| 3575 | ||
| ee094616 RD |
3576 | -- Now that all types from which E may depend are frozen, see if the |
| 3577 | -- size is known at compile time, if it must be unsigned, or if | |
| 7d8b9c99 | 3578 | -- strict alignment is required |
| 70482933 RK |
3579 | |
| 3580 | Check_Compile_Time_Size (E); | |
| 3581 | Check_Unsigned_Type (E); | |
| 3582 | ||
| 3583 | if Base_Type (E) = E then | |
| 3584 | Check_Strict_Alignment (E); | |
| 3585 | end if; | |
| 3586 | ||
| 3587 | -- Do not allow a size clause for a type which does not have a size | |
| 3588 | -- that is known at compile time | |
| 3589 | ||
| 3590 | if Has_Size_Clause (E) | |
| 3591 | and then not Size_Known_At_Compile_Time (E) | |
| 3592 | then | |
| e14c931f | 3593 | -- Suppress this message if errors posted on E, even if we are |
| 07fc65c4 GB |
3594 | -- in all errors mode, since this is often a junk message |
| 3595 | ||
| 3596 | if not Error_Posted (E) then | |
| 3597 | Error_Msg_N | |
| 3598 | ("size clause not allowed for variable length type", | |
| 3599 | Size_Clause (E)); | |
| 3600 | end if; | |
| 70482933 RK |
3601 | end if; |
| 3602 | ||
| 3603 | -- Remaining process is to set/verify the representation information, | |
| 3604 | -- in particular the size and alignment values. This processing is | |
| 3605 | -- not required for generic types, since generic types do not play | |
| 3606 | -- any part in code generation, and so the size and alignment values | |
| c6823a20 | 3607 | -- for such types are irrelevant. |
| 70482933 RK |
3608 | |
| 3609 | if Is_Generic_Type (E) then | |
| 3610 | return Result; | |
| 3611 | ||
| 3612 | -- Otherwise we call the layout procedure | |
| 3613 | ||
| 3614 | else | |
| 3615 | Layout_Type (E); | |
| 3616 | end if; | |
| 3617 | ||
| 3618 | -- End of freeze processing for type entities | |
| 3619 | end if; | |
| 3620 | ||
| 3621 | -- Here is where we logically freeze the current entity. If it has a | |
| 3622 | -- freeze node, then this is the point at which the freeze node is | |
| 3623 | -- linked into the result list. | |
| 3624 | ||
| 3625 | if Has_Delayed_Freeze (E) then | |
| 3626 | ||
| 3627 | -- If a freeze node is already allocated, use it, otherwise allocate | |
| 3628 | -- a new one. The preallocation happens in the case of anonymous base | |
| 3629 | -- types, where we preallocate so that we can set First_Subtype_Link. | |
| 3630 | -- Note that we reset the Sloc to the current freeze location. | |
| 3631 | ||
| 3632 | if Present (Freeze_Node (E)) then | |
| 3633 | F_Node := Freeze_Node (E); | |
| 3634 | Set_Sloc (F_Node, Loc); | |
| 3635 | ||
| 3636 | else | |
| 3637 | F_Node := New_Node (N_Freeze_Entity, Loc); | |
| 3638 | Set_Freeze_Node (E, F_Node); | |
| 3639 | Set_Access_Types_To_Process (F_Node, No_Elist); | |
| 3640 | Set_TSS_Elist (F_Node, No_Elist); | |
| 3641 | Set_Actions (F_Node, No_List); | |
| 3642 | end if; | |
| 3643 | ||
| 3644 | Set_Entity (F_Node, E); | |
| 3645 | ||
| 3646 | if Result = No_List then | |
| 3647 | Result := New_List (F_Node); | |
| 3648 | else | |
| 3649 | Append (F_Node, Result); | |
| 3650 | end if; | |
| 35ae2ed8 AC |
3651 | |
| 3652 | -- A final pass over record types with discriminants. If the type | |
| 3653 | -- has an incomplete declaration, there may be constrained access | |
| 3654 | -- subtypes declared elsewhere, which do not depend on the discrimi- | |
| 3655 | -- nants of the type, and which are used as component types (i.e. | |
| 3656 | -- the full view is a recursive type). The designated types of these | |
| 3657 | -- subtypes can only be elaborated after the type itself, and they | |
| 3658 | -- need an itype reference. | |
| 3659 | ||
| 3660 | if Ekind (E) = E_Record_Type | |
| 3661 | and then Has_Discriminants (E) | |
| 3662 | then | |
| 3663 | declare | |
| 3664 | Comp : Entity_Id; | |
| 3665 | IR : Node_Id; | |
| 3666 | Typ : Entity_Id; | |
| 3667 | ||
| 3668 | begin | |
| 3669 | Comp := First_Component (E); | |
| 3670 | ||
| 3671 | while Present (Comp) loop | |
| 3672 | Typ := Etype (Comp); | |
| 3673 | ||
| 3674 | if Ekind (Comp) = E_Component | |
| 3675 | and then Is_Access_Type (Typ) | |
| 3676 | and then Scope (Typ) /= E | |
| 3677 | and then Base_Type (Designated_Type (Typ)) = E | |
| 3678 | and then Is_Itype (Designated_Type (Typ)) | |
| 3679 | then | |
| 3680 | IR := Make_Itype_Reference (Sloc (Comp)); | |
| 3681 | Set_Itype (IR, Designated_Type (Typ)); | |
| 3682 | Append (IR, Result); | |
| 3683 | end if; | |
| 3684 | ||
| 3685 | Next_Component (Comp); | |
| 3686 | end loop; | |
| 3687 | end; | |
| 3688 | end if; | |
| 70482933 RK |
3689 | end if; |
| 3690 | ||
| 3691 | -- When a type is frozen, the first subtype of the type is frozen as | |
| 3692 | -- well (RM 13.14(15)). This has to be done after freezing the type, | |
| 3693 | -- since obviously the first subtype depends on its own base type. | |
| 3694 | ||
| 3695 | if Is_Type (E) then | |
| 3696 | Freeze_And_Append (First_Subtype (E), Loc, Result); | |
| 3697 | ||
| 3698 | -- If we just froze a tagged non-class wide record, then freeze the | |
| 3699 | -- corresponding class-wide type. This must be done after the tagged | |
| 3700 | -- type itself is frozen, because the class-wide type refers to the | |
| 3701 | -- tagged type which generates the class. | |
| 3702 | ||
| 3703 | if Is_Tagged_Type (E) | |
| 3704 | and then not Is_Class_Wide_Type (E) | |
| 3705 | and then Present (Class_Wide_Type (E)) | |
| 3706 | then | |
| 3707 | Freeze_And_Append (Class_Wide_Type (E), Loc, Result); | |
| 3708 | end if; | |
| 3709 | end if; | |
| 3710 | ||
| 3711 | Check_Debug_Info_Needed (E); | |
| 3712 | ||
| 3713 | -- Special handling for subprograms | |
| 3714 | ||
| 3715 | if Is_Subprogram (E) then | |
| 3716 | ||
| 3717 | -- If subprogram has address clause then reset Is_Public flag, since | |
| 3718 | -- we do not want the backend to generate external references. | |
| 3719 | ||
| 3720 | if Present (Address_Clause (E)) | |
| 3721 | and then not Is_Library_Level_Entity (E) | |
| 3722 | then | |
| 3723 | Set_Is_Public (E, False); | |
| 3724 | ||
| 3725 | -- If no address clause and not intrinsic, then for imported | |
| 3726 | -- subprogram in main unit, generate descriptor if we are in | |
| 3727 | -- Propagate_Exceptions mode. | |
| 3728 | ||
| 3729 | elsif Propagate_Exceptions | |
| 3730 | and then Is_Imported (E) | |
| 3731 | and then not Is_Intrinsic_Subprogram (E) | |
| 3732 | and then Convention (E) /= Convention_Stubbed | |
| 3733 | then | |
| 3734 | if Result = No_List then | |
| 3735 | Result := Empty_List; | |
| 3736 | end if; | |
| 70482933 | 3737 | end if; |
| 70482933 RK |
3738 | end if; |
| 3739 | ||
| 3740 | return Result; | |
| 3741 | end Freeze_Entity; | |
| 3742 | ||
| 3743 | ----------------------------- | |
| 3744 | -- Freeze_Enumeration_Type -- | |
| 3745 | ----------------------------- | |
| 3746 | ||
| 3747 | procedure Freeze_Enumeration_Type (Typ : Entity_Id) is | |
| 3748 | begin | |
| d677afa9 ES |
3749 | -- By default, if no size clause is present, an enumeration type with |
| 3750 | -- Convention C is assumed to interface to a C enum, and has integer | |
| 3751 | -- size. This applies to types. For subtypes, verify that its base | |
| 3752 | -- type has no size clause either. | |
| 3753 | ||
| 70482933 RK |
3754 | if Has_Foreign_Convention (Typ) |
| 3755 | and then not Has_Size_Clause (Typ) | |
| d677afa9 | 3756 | and then not Has_Size_Clause (Base_Type (Typ)) |
| 70482933 RK |
3757 | and then Esize (Typ) < Standard_Integer_Size |
| 3758 | then | |
| 3759 | Init_Esize (Typ, Standard_Integer_Size); | |
| d677afa9 | 3760 | |
| 70482933 | 3761 | else |
| d677afa9 ES |
3762 | -- If the enumeration type interfaces to C, and it has a size clause |
| 3763 | -- that specifies less than int size, it warrants a warning. The | |
| 3764 | -- user may intend the C type to be an enum or a char, so this is | |
| 3765 | -- not by itself an error that the Ada compiler can detect, but it | |
| 3766 | -- it is a worth a heads-up. For Boolean and Character types we | |
| 3767 | -- assume that the programmer has the proper C type in mind. | |
| 3768 | ||
| 3769 | if Convention (Typ) = Convention_C | |
| 3770 | and then Has_Size_Clause (Typ) | |
| 3771 | and then Esize (Typ) /= Esize (Standard_Integer) | |
| 3772 | and then not Is_Boolean_Type (Typ) | |
| 3773 | and then not Is_Character_Type (Typ) | |
| 3774 | then | |
| 3775 | Error_Msg_N | |
| 3776 | ("C enum types have the size of a C int?", Size_Clause (Typ)); | |
| 3777 | end if; | |
| 3778 | ||
| 70482933 RK |
3779 | Adjust_Esize_For_Alignment (Typ); |
| 3780 | end if; | |
| 3781 | end Freeze_Enumeration_Type; | |
| 3782 | ||
| 3783 | ----------------------- | |
| 3784 | -- Freeze_Expression -- | |
| 3785 | ----------------------- | |
| 3786 | ||
| 3787 | procedure Freeze_Expression (N : Node_Id) is | |
| c6a9797e RD |
3788 | In_Spec_Exp : constant Boolean := In_Spec_Expression; |
| 3789 | Typ : Entity_Id; | |
| 3790 | Nam : Entity_Id; | |
| 3791 | Desig_Typ : Entity_Id; | |
| 3792 | P : Node_Id; | |
| 3793 | Parent_P : Node_Id; | |
| 70482933 RK |
3794 | |
| 3795 | Freeze_Outside : Boolean := False; | |
| 3796 | -- This flag is set true if the entity must be frozen outside the | |
| 3797 | -- current subprogram. This happens in the case of expander generated | |
| 3798 | -- subprograms (_Init_Proc, _Input, _Output, _Read, _Write) which do | |
| 3799 | -- not freeze all entities like other bodies, but which nevertheless | |
| 3800 | -- may reference entities that have to be frozen before the body and | |
| 3801 | -- obviously cannot be frozen inside the body. | |
| 3802 | ||
| 3803 | function In_Exp_Body (N : Node_Id) return Boolean; | |
| 3804 | -- Given an N_Handled_Sequence_Of_Statements node N, determines whether | |
| c6823a20 | 3805 | -- it is the handled statement sequence of an expander-generated |
| 7d8b9c99 RD |
3806 | -- subprogram (init proc, stream subprogram, or renaming as body). |
| 3807 | -- If so, this is not a freezing context. | |
| 70482933 | 3808 | |
| fbf5a39b AC |
3809 | ----------------- |
| 3810 | -- In_Exp_Body -- | |
| 3811 | ----------------- | |
| 3812 | ||
| 70482933 | 3813 | function In_Exp_Body (N : Node_Id) return Boolean is |
| 7d8b9c99 RD |
3814 | P : Node_Id; |
| 3815 | Id : Entity_Id; | |
| 70482933 RK |
3816 | |
| 3817 | begin | |
| 3818 | if Nkind (N) = N_Subprogram_Body then | |
| 3819 | P := N; | |
| 3820 | else | |
| 3821 | P := Parent (N); | |
| 3822 | end if; | |
| 3823 | ||
| 3824 | if Nkind (P) /= N_Subprogram_Body then | |
| 3825 | return False; | |
| 3826 | ||
| 3827 | else | |
| 7d8b9c99 RD |
3828 | Id := Defining_Unit_Name (Specification (P)); |
| 3829 | ||
| 3830 | if Nkind (Id) = N_Defining_Identifier | |
| 3831 | and then (Is_Init_Proc (Id) or else | |
| 3832 | Is_TSS (Id, TSS_Stream_Input) or else | |
| 3833 | Is_TSS (Id, TSS_Stream_Output) or else | |
| 3834 | Is_TSS (Id, TSS_Stream_Read) or else | |
| 3835 | Is_TSS (Id, TSS_Stream_Write) or else | |
| 3836 | Nkind (Original_Node (P)) = | |
| 3837 | N_Subprogram_Renaming_Declaration) | |
| 70482933 RK |
3838 | then |
| 3839 | return True; | |
| 3840 | else | |
| 3841 | return False; | |
| 3842 | end if; | |
| 3843 | end if; | |
| 70482933 RK |
3844 | end In_Exp_Body; |
| 3845 | ||
| 3846 | -- Start of processing for Freeze_Expression | |
| 3847 | ||
| 3848 | begin | |
| edd63e9b ES |
3849 | -- Immediate return if freezing is inhibited. This flag is set by the |
| 3850 | -- analyzer to stop freezing on generated expressions that would cause | |
| 3851 | -- freezing if they were in the source program, but which are not | |
| 3852 | -- supposed to freeze, since they are created. | |
| 70482933 RK |
3853 | |
| 3854 | if Must_Not_Freeze (N) then | |
| 3855 | return; | |
| 3856 | end if; | |
| 3857 | ||
| 3858 | -- If expression is non-static, then it does not freeze in a default | |
| 3859 | -- expression, see section "Handling of Default Expressions" in the | |
| 3860 | -- spec of package Sem for further details. Note that we have to | |
| 3861 | -- make sure that we actually have a real expression (if we have | |
| 3862 | -- a subtype indication, we can't test Is_Static_Expression!) | |
| 3863 | ||
| c6a9797e | 3864 | if In_Spec_Exp |
| 70482933 RK |
3865 | and then Nkind (N) in N_Subexpr |
| 3866 | and then not Is_Static_Expression (N) | |
| 3867 | then | |
| 3868 | return; | |
| 3869 | end if; | |
| 3870 | ||
| 3871 | -- Freeze type of expression if not frozen already | |
| 3872 | ||
| fbf5a39b AC |
3873 | Typ := Empty; |
| 3874 | ||
| 3875 | if Nkind (N) in N_Has_Etype then | |
| 3876 | if not Is_Frozen (Etype (N)) then | |
| 3877 | Typ := Etype (N); | |
| 3878 | ||
| 3879 | -- Base type may be an derived numeric type that is frozen at | |
| 3880 | -- the point of declaration, but first_subtype is still unfrozen. | |
| 3881 | ||
| 3882 | elsif not Is_Frozen (First_Subtype (Etype (N))) then | |
| 3883 | Typ := First_Subtype (Etype (N)); | |
| 3884 | end if; | |
| 70482933 RK |
3885 | end if; |
| 3886 | ||
| 3887 | -- For entity name, freeze entity if not frozen already. A special | |
| 3888 | -- exception occurs for an identifier that did not come from source. | |
| 3889 | -- We don't let such identifiers freeze a non-internal entity, i.e. | |
| 3890 | -- an entity that did come from source, since such an identifier was | |
| 3891 | -- generated by the expander, and cannot have any semantic effect on | |
| 3892 | -- the freezing semantics. For example, this stops the parameter of | |
| 3893 | -- an initialization procedure from freezing the variable. | |
| 3894 | ||
| 3895 | if Is_Entity_Name (N) | |
| 3896 | and then not Is_Frozen (Entity (N)) | |
| 3897 | and then (Nkind (N) /= N_Identifier | |
| 3898 | or else Comes_From_Source (N) | |
| 3899 | or else not Comes_From_Source (Entity (N))) | |
| 3900 | then | |
| 3901 | Nam := Entity (N); | |
| 70482933 RK |
3902 | else |
| 3903 | Nam := Empty; | |
| 3904 | end if; | |
| 3905 | ||
| 49e90211 | 3906 | -- For an allocator freeze designated type if not frozen already |
| 70482933 | 3907 | |
| ee094616 RD |
3908 | -- For an aggregate whose component type is an access type, freeze the |
| 3909 | -- designated type now, so that its freeze does not appear within the | |
| 3910 | -- loop that might be created in the expansion of the aggregate. If the | |
| 3911 | -- designated type is a private type without full view, the expression | |
| 3912 | -- cannot contain an allocator, so the type is not frozen. | |
| 70482933 RK |
3913 | |
| 3914 | Desig_Typ := Empty; | |
| 70482933 | 3915 | |
| fbf5a39b | 3916 | case Nkind (N) is |
| 70482933 RK |
3917 | when N_Allocator => |
| 3918 | Desig_Typ := Designated_Type (Etype (N)); | |
| 3919 | ||
| 3920 | when N_Aggregate => | |
| 3921 | if Is_Array_Type (Etype (N)) | |
| 3922 | and then Is_Access_Type (Component_Type (Etype (N))) | |
| 3923 | then | |
| 3924 | Desig_Typ := Designated_Type (Component_Type (Etype (N))); | |
| 3925 | end if; | |
| 3926 | ||
| 3927 | when N_Selected_Component | | |
| 3928 | N_Indexed_Component | | |
| 3929 | N_Slice => | |
| 3930 | ||
| 3931 | if Is_Access_Type (Etype (Prefix (N))) then | |
| 3932 | Desig_Typ := Designated_Type (Etype (Prefix (N))); | |
| 3933 | end if; | |
| 3934 | ||
| 3935 | when others => | |
| 3936 | null; | |
| 70482933 RK |
3937 | end case; |
| 3938 | ||
| 3939 | if Desig_Typ /= Empty | |
| 3940 | and then (Is_Frozen (Desig_Typ) | |
| 3941 | or else (not Is_Fully_Defined (Desig_Typ))) | |
| 3942 | then | |
| 3943 | Desig_Typ := Empty; | |
| 3944 | end if; | |
| 3945 | ||
| 3946 | -- All done if nothing needs freezing | |
| 3947 | ||
| 3948 | if No (Typ) | |
| 3949 | and then No (Nam) | |
| 3950 | and then No (Desig_Typ) | |
| 3951 | then | |
| 3952 | return; | |
| 3953 | end if; | |
| 3954 | ||
| 3955 | -- Loop for looking at the right place to insert the freeze nodes | |
| 3956 | -- exiting from the loop when it is appropriate to insert the freeze | |
| 3957 | -- node before the current node P. | |
| 3958 | ||
| 3959 | -- Also checks some special exceptions to the freezing rules. These | |
| 3960 | -- cases result in a direct return, bypassing the freeze action. | |
| 3961 | ||
| 3962 | P := N; | |
| 3963 | loop | |
| 3964 | Parent_P := Parent (P); | |
| 3965 | ||
| ee094616 RD |
3966 | -- If we don't have a parent, then we are not in a well-formed tree. |
| 3967 | -- This is an unusual case, but there are some legitimate situations | |
| 3968 | -- in which this occurs, notably when the expressions in the range of | |
| 3969 | -- a type declaration are resolved. We simply ignore the freeze | |
| 3970 | -- request in this case. Is this right ??? | |
| 70482933 RK |
3971 | |
| 3972 | if No (Parent_P) then | |
| 3973 | return; | |
| 3974 | end if; | |
| 3975 | ||
| 3976 | -- See if we have got to an appropriate point in the tree | |
| 3977 | ||
| 3978 | case Nkind (Parent_P) is | |
| 3979 | ||
| edd63e9b ES |
3980 | -- A special test for the exception of (RM 13.14(8)) for the case |
| 3981 | -- of per-object expressions (RM 3.8(18)) occurring in component | |
| 3982 | -- definition or a discrete subtype definition. Note that we test | |
| 3983 | -- for a component declaration which includes both cases we are | |
| 3984 | -- interested in, and furthermore the tree does not have explicit | |
| 3985 | -- nodes for either of these two constructs. | |
| 70482933 RK |
3986 | |
| 3987 | when N_Component_Declaration => | |
| 3988 | ||
| 3989 | -- The case we want to test for here is an identifier that is | |
| 3990 | -- a per-object expression, this is either a discriminant that | |
| 3991 | -- appears in a context other than the component declaration | |
| 3992 | -- or it is a reference to the type of the enclosing construct. | |
| 3993 | ||
| 3994 | -- For either of these cases, we skip the freezing | |
| 3995 | ||
| c6a9797e | 3996 | if not In_Spec_Expression |
| 70482933 RK |
3997 | and then Nkind (N) = N_Identifier |
| 3998 | and then (Present (Entity (N))) | |
| 3999 | then | |
| 4000 | -- We recognize the discriminant case by just looking for | |
| 4001 | -- a reference to a discriminant. It can only be one for | |
| 4002 | -- the enclosing construct. Skip freezing in this case. | |
| 4003 | ||
| 4004 | if Ekind (Entity (N)) = E_Discriminant then | |
| 4005 | return; | |
| 4006 | ||
| 4007 | -- For the case of a reference to the enclosing record, | |
| 4008 | -- (or task or protected type), we look for a type that | |
| 4009 | -- matches the current scope. | |
| 4010 | ||
| 4011 | elsif Entity (N) = Current_Scope then | |
| 4012 | return; | |
| 4013 | end if; | |
| 4014 | end if; | |
| 4015 | ||
| edd63e9b ES |
4016 | -- If we have an enumeration literal that appears as the choice in |
| 4017 | -- the aggregate of an enumeration representation clause, then | |
| 4018 | -- freezing does not occur (RM 13.14(10)). | |
| 70482933 RK |
4019 | |
| 4020 | when N_Enumeration_Representation_Clause => | |
| 4021 | ||
| 4022 | -- The case we are looking for is an enumeration literal | |
| 4023 | ||
| 4024 | if (Nkind (N) = N_Identifier or Nkind (N) = N_Character_Literal) | |
| 4025 | and then Is_Enumeration_Type (Etype (N)) | |
| 4026 | then | |
| 4027 | -- If enumeration literal appears directly as the choice, | |
| e14c931f | 4028 | -- do not freeze (this is the normal non-overloaded case) |
| 70482933 RK |
4029 | |
| 4030 | if Nkind (Parent (N)) = N_Component_Association | |
| 4031 | and then First (Choices (Parent (N))) = N | |
| 4032 | then | |
| 4033 | return; | |
| 4034 | ||
| ee094616 RD |
4035 | -- If enumeration literal appears as the name of function |
| 4036 | -- which is the choice, then also do not freeze. This | |
| 4037 | -- happens in the overloaded literal case, where the | |
| 70482933 RK |
4038 | -- enumeration literal is temporarily changed to a function |
| 4039 | -- call for overloading analysis purposes. | |
| 4040 | ||
| 4041 | elsif Nkind (Parent (N)) = N_Function_Call | |
| 4042 | and then | |
| 4043 | Nkind (Parent (Parent (N))) = N_Component_Association | |
| 4044 | and then | |
| 4045 | First (Choices (Parent (Parent (N)))) = Parent (N) | |
| 4046 | then | |
| 4047 | return; | |
| 4048 | end if; | |
| 4049 | end if; | |
| 4050 | ||
| 4051 | -- Normally if the parent is a handled sequence of statements, | |
| 4052 | -- then the current node must be a statement, and that is an | |
| 4053 | -- appropriate place to insert a freeze node. | |
| 4054 | ||
| 4055 | when N_Handled_Sequence_Of_Statements => | |
| 4056 | ||
| edd63e9b ES |
4057 | -- An exception occurs when the sequence of statements is for |
| 4058 | -- an expander generated body that did not do the usual freeze | |
| 4059 | -- all operation. In this case we usually want to freeze | |
| 4060 | -- outside this body, not inside it, and we skip past the | |
| 4061 | -- subprogram body that we are inside. | |
| 70482933 RK |
4062 | |
| 4063 | if In_Exp_Body (Parent_P) then | |
| 4064 | ||
| 4065 | -- However, we *do* want to freeze at this point if we have | |
| 4066 | -- an entity to freeze, and that entity is declared *inside* | |
| 4067 | -- the body of the expander generated procedure. This case | |
| 4068 | -- is recognized by the scope of the type, which is either | |
| 4069 | -- the spec for some enclosing body, or (in the case of | |
| 4070 | -- init_procs, for which there are no separate specs) the | |
| 4071 | -- current scope. | |
| 4072 | ||
| 4073 | declare | |
| 4074 | Subp : constant Node_Id := Parent (Parent_P); | |
| 4075 | Cspc : Entity_Id; | |
| 4076 | ||
| 4077 | begin | |
| 4078 | if Nkind (Subp) = N_Subprogram_Body then | |
| 4079 | Cspc := Corresponding_Spec (Subp); | |
| 4080 | ||
| 4081 | if (Present (Typ) and then Scope (Typ) = Cspc) | |
| 4082 | or else | |
| 4083 | (Present (Nam) and then Scope (Nam) = Cspc) | |
| 4084 | then | |
| 4085 | exit; | |
| 4086 | ||
| 4087 | elsif Present (Typ) | |
| 4088 | and then Scope (Typ) = Current_Scope | |
| 4089 | and then Current_Scope = Defining_Entity (Subp) | |
| 4090 | then | |
| 4091 | exit; | |
| 4092 | end if; | |
| 4093 | end if; | |
| 4094 | end; | |
| 4095 | ||
| 4096 | -- If not that exception to the exception, then this is | |
| 4097 | -- where we delay the freeze till outside the body. | |
| 4098 | ||
| 4099 | Parent_P := Parent (Parent_P); | |
| 4100 | Freeze_Outside := True; | |
| 4101 | ||
| 4102 | -- Here if normal case where we are in handled statement | |
| 4103 | -- sequence and want to do the insertion right there. | |
| 4104 | ||
| 4105 | else | |
| 4106 | exit; | |
| 4107 | end if; | |
| 4108 | ||
| ee094616 RD |
4109 | -- If parent is a body or a spec or a block, then the current node |
| 4110 | -- is a statement or declaration and we can insert the freeze node | |
| 4111 | -- before it. | |
| 70482933 RK |
4112 | |
| 4113 | when N_Package_Specification | | |
| 4114 | N_Package_Body | | |
| 4115 | N_Subprogram_Body | | |
| 4116 | N_Task_Body | | |
| 4117 | N_Protected_Body | | |
| 4118 | N_Entry_Body | | |
| 4119 | N_Block_Statement => exit; | |
| 4120 | ||
| 4121 | -- The expander is allowed to define types in any statements list, | |
| 4122 | -- so any of the following parent nodes also mark a freezing point | |
| 4123 | -- if the actual node is in a list of statements or declarations. | |
| 4124 | ||
| 4125 | when N_Exception_Handler | | |
| 4126 | N_If_Statement | | |
| 4127 | N_Elsif_Part | | |
| 4128 | N_Case_Statement_Alternative | | |
| 4129 | N_Compilation_Unit_Aux | | |
| 4130 | N_Selective_Accept | | |
| 4131 | N_Accept_Alternative | | |
| 4132 | N_Delay_Alternative | | |
| 4133 | N_Conditional_Entry_Call | | |
| 4134 | N_Entry_Call_Alternative | | |
| 4135 | N_Triggering_Alternative | | |
| 4136 | N_Abortable_Part | | |
| 4137 | N_Freeze_Entity => | |
| 4138 | ||
| 4139 | exit when Is_List_Member (P); | |
| 4140 | ||
| 4141 | -- Note: The N_Loop_Statement is a special case. A type that | |
| 4142 | -- appears in the source can never be frozen in a loop (this | |
| edd63e9b ES |
4143 | -- occurs only because of a loop expanded by the expander), so we |
| 4144 | -- keep on going. Otherwise we terminate the search. Same is true | |
| ee094616 RD |
4145 | -- of any entity which comes from source. (if they have predefined |
| 4146 | -- type, that type does not appear to come from source, but the | |
| 4147 | -- entity should not be frozen here). | |
| 70482933 RK |
4148 | |
| 4149 | when N_Loop_Statement => | |
| 4150 | exit when not Comes_From_Source (Etype (N)) | |
| 4151 | and then (No (Nam) or else not Comes_From_Source (Nam)); | |
| 4152 | ||
| 4153 | -- For all other cases, keep looking at parents | |
| 4154 | ||
| 4155 | when others => | |
| 4156 | null; | |
| 4157 | end case; | |
| 4158 | ||
| 4159 | -- We fall through the case if we did not yet find the proper | |
| 4160 | -- place in the free for inserting the freeze node, so climb! | |
| 4161 | ||
| 4162 | P := Parent_P; | |
| 4163 | end loop; | |
| 4164 | ||
| edd63e9b ES |
4165 | -- If the expression appears in a record or an initialization procedure, |
| 4166 | -- the freeze nodes are collected and attached to the current scope, to | |
| 4167 | -- be inserted and analyzed on exit from the scope, to insure that | |
| 4168 | -- generated entities appear in the correct scope. If the expression is | |
| 4169 | -- a default for a discriminant specification, the scope is still void. | |
| 4170 | -- The expression can also appear in the discriminant part of a private | |
| 4171 | -- or concurrent type. | |
| 70482933 | 4172 | |
| c6823a20 | 4173 | -- If the expression appears in a constrained subcomponent of an |
| edd63e9b ES |
4174 | -- enclosing record declaration, the freeze nodes must be attached to |
| 4175 | -- the outer record type so they can eventually be placed in the | |
| c6823a20 EB |
4176 | -- enclosing declaration list. |
| 4177 | ||
| ee094616 RD |
4178 | -- The other case requiring this special handling is if we are in a |
| 4179 | -- default expression, since in that case we are about to freeze a | |
| 4180 | -- static type, and the freeze scope needs to be the outer scope, not | |
| 4181 | -- the scope of the subprogram with the default parameter. | |
| 70482933 | 4182 | |
| c6a9797e RD |
4183 | -- For default expressions and other spec expressions in generic units, |
| 4184 | -- the Move_Freeze_Nodes mechanism (see sem_ch12.adb) takes care of | |
| 4185 | -- placing them at the proper place, after the generic unit. | |
| 70482933 | 4186 | |
| c6a9797e | 4187 | if (In_Spec_Exp and not Inside_A_Generic) |
| 70482933 RK |
4188 | or else Freeze_Outside |
| 4189 | or else (Is_Type (Current_Scope) | |
| 4190 | and then (not Is_Concurrent_Type (Current_Scope) | |
| 4191 | or else not Has_Completion (Current_Scope))) | |
| 4192 | or else Ekind (Current_Scope) = E_Void | |
| 4193 | then | |
| 4194 | declare | |
| 4195 | Loc : constant Source_Ptr := Sloc (Current_Scope); | |
| 4196 | Freeze_Nodes : List_Id := No_List; | |
| c6823a20 | 4197 | Pos : Int := Scope_Stack.Last; |
| 70482933 RK |
4198 | |
| 4199 | begin | |
| 4200 | if Present (Desig_Typ) then | |
| 4201 | Freeze_And_Append (Desig_Typ, Loc, Freeze_Nodes); | |
| 4202 | end if; | |
| 4203 | ||
| 4204 | if Present (Typ) then | |
| 4205 | Freeze_And_Append (Typ, Loc, Freeze_Nodes); | |
| 4206 | end if; | |
| 4207 | ||
| 4208 | if Present (Nam) then | |
| 4209 | Freeze_And_Append (Nam, Loc, Freeze_Nodes); | |
| 4210 | end if; | |
| 4211 | ||
| c6823a20 EB |
4212 | -- The current scope may be that of a constrained component of |
| 4213 | -- an enclosing record declaration, which is above the current | |
| 4214 | -- scope in the scope stack. | |
| 4215 | ||
| 4216 | if Is_Record_Type (Scope (Current_Scope)) then | |
| 4217 | Pos := Pos - 1; | |
| 4218 | end if; | |
| 4219 | ||
| 70482933 | 4220 | if Is_Non_Empty_List (Freeze_Nodes) then |
| c6823a20 EB |
4221 | if No (Scope_Stack.Table (Pos).Pending_Freeze_Actions) then |
| 4222 | Scope_Stack.Table (Pos).Pending_Freeze_Actions := | |
| 70482933 RK |
4223 | Freeze_Nodes; |
| 4224 | else | |
| 4225 | Append_List (Freeze_Nodes, Scope_Stack.Table | |
| c6823a20 | 4226 | (Pos).Pending_Freeze_Actions); |
| 70482933 RK |
4227 | end if; |
| 4228 | end if; | |
| 4229 | end; | |
| 4230 | ||
| 4231 | return; | |
| 4232 | end if; | |
| 4233 | ||
| 4234 | -- Now we have the right place to do the freezing. First, a special | |
| c6a9797e RD |
4235 | -- adjustment, if we are in spec-expression analysis mode, these freeze |
| 4236 | -- actions must not be thrown away (normally all inserted actions are | |
| 4237 | -- thrown away in this mode. However, the freeze actions are from static | |
| 4238 | -- expressions and one of the important reasons we are doing this | |
| ee094616 | 4239 | -- special analysis is to get these freeze actions. Therefore we turn |
| c6a9797e | 4240 | -- off the In_Spec_Expression mode to propagate these freeze actions. |
| ee094616 | 4241 | -- This also means they get properly analyzed and expanded. |
| 70482933 | 4242 | |
| c6a9797e | 4243 | In_Spec_Expression := False; |
| 70482933 | 4244 | |
| fbf5a39b | 4245 | -- Freeze the designated type of an allocator (RM 13.14(13)) |
| 70482933 RK |
4246 | |
| 4247 | if Present (Desig_Typ) then | |
| 4248 | Freeze_Before (P, Desig_Typ); | |
| 4249 | end if; | |
| 4250 | ||
| fbf5a39b | 4251 | -- Freeze type of expression (RM 13.14(10)). Note that we took care of |
| 70482933 RK |
4252 | -- the enumeration representation clause exception in the loop above. |
| 4253 | ||
| 4254 | if Present (Typ) then | |
| 4255 | Freeze_Before (P, Typ); | |
| 4256 | end if; | |
| 4257 | ||
| fbf5a39b | 4258 | -- Freeze name if one is present (RM 13.14(11)) |
| 70482933 RK |
4259 | |
| 4260 | if Present (Nam) then | |
| 4261 | Freeze_Before (P, Nam); | |
| 4262 | end if; | |
| 4263 | ||
| c6a9797e RD |
4264 | -- Restore In_Spec_Expression flag |
| 4265 | ||
| 4266 | In_Spec_Expression := In_Spec_Exp; | |
| 70482933 RK |
4267 | end Freeze_Expression; |
| 4268 | ||
| 4269 | ----------------------------- | |
| 4270 | -- Freeze_Fixed_Point_Type -- | |
| 4271 | ----------------------------- | |
| 4272 | ||
| edd63e9b ES |
4273 | -- Certain fixed-point types and subtypes, including implicit base types |
| 4274 | -- and declared first subtypes, have not yet set up a range. This is | |
| 4275 | -- because the range cannot be set until the Small and Size values are | |
| 4276 | -- known, and these are not known till the type is frozen. | |
| 70482933 | 4277 | |
| edd63e9b ES |
4278 | -- To signal this case, Scalar_Range contains an unanalyzed syntactic range |
| 4279 | -- whose bounds are unanalyzed real literals. This routine will recognize | |
| 4280 | -- this case, and transform this range node into a properly typed range | |
| 4281 | -- with properly analyzed and resolved values. | |
| 70482933 RK |
4282 | |
| 4283 | procedure Freeze_Fixed_Point_Type (Typ : Entity_Id) is | |
| 4284 | Rng : constant Node_Id := Scalar_Range (Typ); | |
| 4285 | Lo : constant Node_Id := Low_Bound (Rng); | |
| 4286 | Hi : constant Node_Id := High_Bound (Rng); | |
| 4287 | Btyp : constant Entity_Id := Base_Type (Typ); | |
| 4288 | Brng : constant Node_Id := Scalar_Range (Btyp); | |
| 4289 | BLo : constant Node_Id := Low_Bound (Brng); | |
| 4290 | BHi : constant Node_Id := High_Bound (Brng); | |
| 4291 | Small : constant Ureal := Small_Value (Typ); | |
| 4292 | Loval : Ureal; | |
| 4293 | Hival : Ureal; | |
| 4294 | Atype : Entity_Id; | |
| 4295 | ||
| 4296 | Actual_Size : Nat; | |
| 4297 | ||
| 4298 | function Fsize (Lov, Hiv : Ureal) return Nat; | |
| 4299 | -- Returns size of type with given bounds. Also leaves these | |
| 4300 | -- bounds set as the current bounds of the Typ. | |
| 4301 | ||
| 0da2c8ac AC |
4302 | ----------- |
| 4303 | -- Fsize -- | |
| 4304 | ----------- | |
| 4305 | ||
| 70482933 RK |
4306 | function Fsize (Lov, Hiv : Ureal) return Nat is |
| 4307 | begin | |
| 4308 | Set_Realval (Lo, Lov); | |
| 4309 | Set_Realval (Hi, Hiv); | |
| 4310 | return Minimum_Size (Typ); | |
| 4311 | end Fsize; | |
| 4312 | ||
| 0da2c8ac | 4313 | -- Start of processing for Freeze_Fixed_Point_Type |
| 70482933 RK |
4314 | |
| 4315 | begin | |
| 4316 | -- If Esize of a subtype has not previously been set, set it now | |
| 4317 | ||
| 4318 | if Unknown_Esize (Typ) then | |
| 4319 | Atype := Ancestor_Subtype (Typ); | |
| 4320 | ||
| 4321 | if Present (Atype) then | |
| fbf5a39b | 4322 | Set_Esize (Typ, Esize (Atype)); |
| 70482933 | 4323 | else |
| fbf5a39b | 4324 | Set_Esize (Typ, Esize (Base_Type (Typ))); |
| 70482933 RK |
4325 | end if; |
| 4326 | end if; | |
| 4327 | ||
| ee094616 RD |
4328 | -- Immediate return if the range is already analyzed. This means that |
| 4329 | -- the range is already set, and does not need to be computed by this | |
| 4330 | -- routine. | |
| 70482933 RK |
4331 | |
| 4332 | if Analyzed (Rng) then | |
| 4333 | return; | |
| 4334 | end if; | |
| 4335 | ||
| 4336 | -- Immediate return if either of the bounds raises Constraint_Error | |
| 4337 | ||
| 4338 | if Raises_Constraint_Error (Lo) | |
| 4339 | or else Raises_Constraint_Error (Hi) | |
| 4340 | then | |
| 4341 | return; | |
| 4342 | end if; | |
| 4343 | ||
| 4344 | Loval := Realval (Lo); | |
| 4345 | Hival := Realval (Hi); | |
| 4346 | ||
| 4347 | -- Ordinary fixed-point case | |
| 4348 | ||
| 4349 | if Is_Ordinary_Fixed_Point_Type (Typ) then | |
| 4350 | ||
| 4351 | -- For the ordinary fixed-point case, we are allowed to fudge the | |
| ee094616 RD |
4352 | -- end-points up or down by small. Generally we prefer to fudge up, |
| 4353 | -- i.e. widen the bounds for non-model numbers so that the end points | |
| 4354 | -- are included. However there are cases in which this cannot be | |
| 4355 | -- done, and indeed cases in which we may need to narrow the bounds. | |
| 4356 | -- The following circuit makes the decision. | |
| 70482933 | 4357 | |
| ee094616 RD |
4358 | -- Note: our terminology here is that Incl_EP means that the bounds |
| 4359 | -- are widened by Small if necessary to include the end points, and | |
| 4360 | -- Excl_EP means that the bounds are narrowed by Small to exclude the | |
| 4361 | -- end-points if this reduces the size. | |
| 70482933 RK |
4362 | |
| 4363 | -- Note that in the Incl case, all we care about is including the | |
| 4364 | -- end-points. In the Excl case, we want to narrow the bounds as | |
| 4365 | -- much as permitted by the RM, to give the smallest possible size. | |
| 4366 | ||
| 4367 | Fudge : declare | |
| 4368 | Loval_Incl_EP : Ureal; | |
| 4369 | Hival_Incl_EP : Ureal; | |
| 4370 | ||
| 4371 | Loval_Excl_EP : Ureal; | |
| 4372 | Hival_Excl_EP : Ureal; | |
| 4373 | ||
| 4374 | Size_Incl_EP : Nat; | |
| 4375 | Size_Excl_EP : Nat; | |
| 4376 | ||
| 4377 | Model_Num : Ureal; | |
| 4378 | First_Subt : Entity_Id; | |
| 4379 | Actual_Lo : Ureal; | |
| 4380 | Actual_Hi : Ureal; | |
| 4381 | ||
| 4382 | begin | |
| 4383 | -- First step. Base types are required to be symmetrical. Right | |
| 4384 | -- now, the base type range is a copy of the first subtype range. | |
| 4385 | -- This will be corrected before we are done, but right away we | |
| 4386 | -- need to deal with the case where both bounds are non-negative. | |
| 4387 | -- In this case, we set the low bound to the negative of the high | |
| 4388 | -- bound, to make sure that the size is computed to include the | |
| 4389 | -- required sign. Note that we do not need to worry about the | |
| 4390 | -- case of both bounds negative, because the sign will be dealt | |
| 4391 | -- with anyway. Furthermore we can't just go making such a bound | |
| 4392 | -- symmetrical, since in a twos-complement system, there is an | |
| e14c931f | 4393 | -- extra negative value which could not be accommodated on the |
| 70482933 RK |
4394 | -- positive side. |
| 4395 | ||
| 4396 | if Typ = Btyp | |
| 4397 | and then not UR_Is_Negative (Loval) | |
| 4398 | and then Hival > Loval | |
| 4399 | then | |
| 4400 | Loval := -Hival; | |
| 4401 | Set_Realval (Lo, Loval); | |
| 4402 | end if; | |
| 4403 | ||
| 4404 | -- Compute the fudged bounds. If the number is a model number, | |
| edd63e9b ES |
4405 | -- then we do nothing to include it, but we are allowed to backoff |
| 4406 | -- to the next adjacent model number when we exclude it. If it is | |
| 4407 | -- not a model number then we straddle the two values with the | |
| 4408 | -- model numbers on either side. | |
| 70482933 RK |
4409 | |
| 4410 | Model_Num := UR_Trunc (Loval / Small) * Small; | |
| 4411 | ||
| 4412 | if Loval = Model_Num then | |
| 4413 | Loval_Incl_EP := Model_Num; | |
| 4414 | else | |
| 4415 | Loval_Incl_EP := Model_Num - Small; | |
| 4416 | end if; | |
| 4417 | ||
| 4418 | -- The low value excluding the end point is Small greater, but | |
| 4419 | -- we do not do this exclusion if the low value is positive, | |
| 4420 | -- since it can't help the size and could actually hurt by | |
| 4421 | -- crossing the high bound. | |
| 4422 | ||
| 4423 | if UR_Is_Negative (Loval_Incl_EP) then | |
| 4424 | Loval_Excl_EP := Loval_Incl_EP + Small; | |
| def46b54 RD |
4425 | |
| 4426 | -- If the value went from negative to zero, then we have the | |
| 4427 | -- case where Loval_Incl_EP is the model number just below | |
| 4428 | -- zero, so we want to stick to the negative value for the | |
| 4429 | -- base type to maintain the condition that the size will | |
| 4430 | -- include signed values. | |
| 4431 | ||
| 4432 | if Typ = Btyp | |
| 4433 | and then UR_Is_Zero (Loval_Excl_EP) | |
| 4434 | then | |
| 4435 | Loval_Excl_EP := Loval_Incl_EP; | |
| 4436 | end if; | |
| 4437 | ||
| 70482933 RK |
4438 | else |
| 4439 | Loval_Excl_EP := Loval_Incl_EP; | |
| 4440 | end if; | |
| 4441 | ||
| 4442 | -- Similar processing for upper bound and high value | |
| 4443 | ||
| 4444 | Model_Num := UR_Trunc (Hival / Small) * Small; | |
| 4445 | ||
| 4446 | if Hival = Model_Num then | |
| 4447 | Hival_Incl_EP := Model_Num; | |
| 4448 | else | |
| 4449 | Hival_Incl_EP := Model_Num + Small; | |
| 4450 | end if; | |
| 4451 | ||
| 4452 | if UR_Is_Positive (Hival_Incl_EP) then | |
| 4453 | Hival_Excl_EP := Hival_Incl_EP - Small; | |
| 4454 | else | |
| 4455 | Hival_Excl_EP := Hival_Incl_EP; | |
| 4456 | end if; | |
| 4457 | ||
| ee094616 RD |
4458 | -- One further adjustment is needed. In the case of subtypes, we |
| 4459 | -- cannot go outside the range of the base type, or we get | |
| 70482933 | 4460 | -- peculiarities, and the base type range is already set. This |
| ee094616 RD |
4461 | -- only applies to the Incl values, since clearly the Excl values |
| 4462 | -- are already as restricted as they are allowed to be. | |
| 70482933 RK |
4463 | |
| 4464 | if Typ /= Btyp then | |
| 4465 | Loval_Incl_EP := UR_Max (Loval_Incl_EP, Realval (BLo)); | |
| 4466 | Hival_Incl_EP := UR_Min (Hival_Incl_EP, Realval (BHi)); | |
| 4467 | end if; | |
| 4468 | ||
| 4469 | -- Get size including and excluding end points | |
| 4470 | ||
| 4471 | Size_Incl_EP := Fsize (Loval_Incl_EP, Hival_Incl_EP); | |
| 4472 | Size_Excl_EP := Fsize (Loval_Excl_EP, Hival_Excl_EP); | |
| 4473 | ||
| 4474 | -- No need to exclude end-points if it does not reduce size | |
| 4475 | ||
| 4476 | if Fsize (Loval_Incl_EP, Hival_Excl_EP) = Size_Excl_EP then | |
| 4477 | Loval_Excl_EP := Loval_Incl_EP; | |
| 4478 | end if; | |
| 4479 | ||
| 4480 | if Fsize (Loval_Excl_EP, Hival_Incl_EP) = Size_Excl_EP then | |
| 4481 | Hival_Excl_EP := Hival_Incl_EP; | |
| 4482 | end if; | |
| 4483 | ||
| 4484 | -- Now we set the actual size to be used. We want to use the | |
| 4485 | -- bounds fudged up to include the end-points but only if this | |
| 4486 | -- can be done without violating a specifically given size | |
| 4487 | -- size clause or causing an unacceptable increase in size. | |
| 4488 | ||
| 4489 | -- Case of size clause given | |
| 4490 | ||
| 4491 | if Has_Size_Clause (Typ) then | |
| 4492 | ||
| 4493 | -- Use the inclusive size only if it is consistent with | |
| 4494 | -- the explicitly specified size. | |
| 4495 | ||
| 4496 | if Size_Incl_EP <= RM_Size (Typ) then | |
| 4497 | Actual_Lo := Loval_Incl_EP; | |
| 4498 | Actual_Hi := Hival_Incl_EP; | |
| 4499 | Actual_Size := Size_Incl_EP; | |
| 4500 | ||
| 4501 | -- If the inclusive size is too large, we try excluding | |
| 4502 | -- the end-points (will be caught later if does not work). | |
| 4503 | ||
| 4504 | else | |
| 4505 | Actual_Lo := Loval_Excl_EP; | |
| 4506 | Actual_Hi := Hival_Excl_EP; | |
| 4507 | Actual_Size := Size_Excl_EP; | |
| 4508 | end if; | |
| 4509 | ||
| 4510 | -- Case of size clause not given | |
| 4511 | ||
| 4512 | else | |
| 4513 | -- If we have a base type whose corresponding first subtype | |
| 4514 | -- has an explicit size that is large enough to include our | |
| 4515 | -- end-points, then do so. There is no point in working hard | |
| 4516 | -- to get a base type whose size is smaller than the specified | |
| 4517 | -- size of the first subtype. | |
| 4518 | ||
| 4519 | First_Subt := First_Subtype (Typ); | |
| 4520 | ||
| 4521 | if Has_Size_Clause (First_Subt) | |
| 4522 | and then Size_Incl_EP <= Esize (First_Subt) | |
| 4523 | then | |
| 4524 | Actual_Size := Size_Incl_EP; | |
| 4525 | Actual_Lo := Loval_Incl_EP; | |
| 4526 | Actual_Hi := Hival_Incl_EP; | |
| 4527 | ||
| 4528 | -- If excluding the end-points makes the size smaller and | |
| 4529 | -- results in a size of 8,16,32,64, then we take the smaller | |
| 4530 | -- size. For the 64 case, this is compulsory. For the other | |
| 4531 | -- cases, it seems reasonable. We like to include end points | |
| 4532 | -- if we can, but not at the expense of moving to the next | |
| 4533 | -- natural boundary of size. | |
| 4534 | ||
| 4535 | elsif Size_Incl_EP /= Size_Excl_EP | |
| 4536 | and then | |
| 4537 | (Size_Excl_EP = 8 or else | |
| 4538 | Size_Excl_EP = 16 or else | |
| 4539 | Size_Excl_EP = 32 or else | |
| 4540 | Size_Excl_EP = 64) | |
| 4541 | then | |
| 4542 | Actual_Size := Size_Excl_EP; | |
| 4543 | Actual_Lo := Loval_Excl_EP; | |
| 4544 | Actual_Hi := Hival_Excl_EP; | |
| 4545 | ||
| 4546 | -- Otherwise we can definitely include the end points | |
| 4547 | ||
| 4548 | else | |
| 4549 | Actual_Size := Size_Incl_EP; | |
| 4550 | Actual_Lo := Loval_Incl_EP; | |
| 4551 | Actual_Hi := Hival_Incl_EP; | |
| 4552 | end if; | |
| 4553 | ||
| edd63e9b ES |
4554 | -- One pathological case: normally we never fudge a low bound |
| 4555 | -- down, since it would seem to increase the size (if it has | |
| 4556 | -- any effect), but for ranges containing single value, or no | |
| 4557 | -- values, the high bound can be small too large. Consider: | |
| 70482933 RK |
4558 | |
| 4559 | -- type t is delta 2.0**(-14) | |
| 4560 | -- range 131072.0 .. 0; | |
| 4561 | ||
| edd63e9b ES |
4562 | -- That lower bound is *just* outside the range of 32 bits, and |
| 4563 | -- does need fudging down in this case. Note that the bounds | |
| 4564 | -- will always have crossed here, since the high bound will be | |
| 4565 | -- fudged down if necessary, as in the case of: | |
| 70482933 RK |
4566 | |
| 4567 | -- type t is delta 2.0**(-14) | |
| 4568 | -- range 131072.0 .. 131072.0; | |
| 4569 | ||
| edd63e9b ES |
4570 | -- So we detect the situation by looking for crossed bounds, |
| 4571 | -- and if the bounds are crossed, and the low bound is greater | |
| 4572 | -- than zero, we will always back it off by small, since this | |
| 4573 | -- is completely harmless. | |
| 70482933 RK |
4574 | |
| 4575 | if Actual_Lo > Actual_Hi then | |
| 4576 | if UR_Is_Positive (Actual_Lo) then | |
| 4577 | Actual_Lo := Loval_Incl_EP - Small; | |
| 4578 | Actual_Size := Fsize (Actual_Lo, Actual_Hi); | |
| 4579 | ||
| 4580 | -- And of course, we need to do exactly the same parallel | |
| 4581 | -- fudge for flat ranges in the negative region. | |
| 4582 | ||
| 4583 | elsif UR_Is_Negative (Actual_Hi) then | |
| 4584 | Actual_Hi := Hival_Incl_EP + Small; | |
| 4585 | Actual_Size := Fsize (Actual_Lo, Actual_Hi); | |
| 4586 | end if; | |
| 4587 | end if; | |
| 4588 | end if; | |
| 4589 | ||
| 4590 | Set_Realval (Lo, Actual_Lo); | |
| 4591 | Set_Realval (Hi, Actual_Hi); | |
| 4592 | end Fudge; | |
| 4593 | ||
| 4594 | -- For the decimal case, none of this fudging is required, since there | |
| 4595 | -- are no end-point problems in the decimal case (the end-points are | |
| 4596 | -- always included). | |
| 4597 | ||
| 4598 | else | |
| 4599 | Actual_Size := Fsize (Loval, Hival); | |
| 4600 | end if; | |
| 4601 | ||
| 4602 | -- At this stage, the actual size has been calculated and the proper | |
| 4603 | -- required bounds are stored in the low and high bounds. | |
| 4604 | ||
| 4605 | if Actual_Size > 64 then | |
| 4606 | Error_Msg_Uint_1 := UI_From_Int (Actual_Size); | |
| 4607 | Error_Msg_N | |
| 7d8b9c99 RD |
4608 | ("size required (^) for type& too large, maximum allowed is 64", |
| 4609 | Typ); | |
| 70482933 RK |
4610 | Actual_Size := 64; |
| 4611 | end if; | |
| 4612 | ||
| 4613 | -- Check size against explicit given size | |
| 4614 | ||
| 4615 | if Has_Size_Clause (Typ) then | |
| 4616 | if Actual_Size > RM_Size (Typ) then | |
| 4617 | Error_Msg_Uint_1 := RM_Size (Typ); | |
| 4618 | Error_Msg_Uint_2 := UI_From_Int (Actual_Size); | |
| 4619 | Error_Msg_NE | |
| 7d8b9c99 | 4620 | ("size given (^) for type& too small, minimum allowed is ^", |
| 70482933 RK |
4621 | Size_Clause (Typ), Typ); |
| 4622 | ||
| 4623 | else | |
| 4624 | Actual_Size := UI_To_Int (Esize (Typ)); | |
| 4625 | end if; | |
| 4626 | ||
| 4627 | -- Increase size to next natural boundary if no size clause given | |
| 4628 | ||
| 4629 | else | |
| 4630 | if Actual_Size <= 8 then | |
| 4631 | Actual_Size := 8; | |
| 4632 | elsif Actual_Size <= 16 then | |
| 4633 | Actual_Size := 16; | |
| 4634 | elsif Actual_Size <= 32 then | |
| 4635 | Actual_Size := 32; | |
| 4636 | else | |
| 4637 | Actual_Size := 64; | |
| 4638 | end if; | |
| 4639 | ||
| 4640 | Init_Esize (Typ, Actual_Size); | |
| 4641 | Adjust_Esize_For_Alignment (Typ); | |
| 4642 | end if; | |
| 4643 | ||
| edd63e9b ES |
4644 | -- If we have a base type, then expand the bounds so that they extend to |
| 4645 | -- the full width of the allocated size in bits, to avoid junk range | |
| 4646 | -- checks on intermediate computations. | |
| 70482933 RK |
4647 | |
| 4648 | if Base_Type (Typ) = Typ then | |
| 4649 | Set_Realval (Lo, -(Small * (Uint_2 ** (Actual_Size - 1)))); | |
| 4650 | Set_Realval (Hi, (Small * (Uint_2 ** (Actual_Size - 1) - 1))); | |
| 4651 | end if; | |
| 4652 | ||
| 4653 | -- Final step is to reanalyze the bounds using the proper type | |
| 4654 | -- and set the Corresponding_Integer_Value fields of the literals. | |
| 4655 | ||
| 4656 | Set_Etype (Lo, Empty); | |
| 4657 | Set_Analyzed (Lo, False); | |
| 4658 | Analyze (Lo); | |
| 4659 | ||
| edd63e9b ES |
4660 | -- Resolve with universal fixed if the base type, and the base type if |
| 4661 | -- it is a subtype. Note we can't resolve the base type with itself, | |
| 4662 | -- that would be a reference before definition. | |
| 70482933 RK |
4663 | |
| 4664 | if Typ = Btyp then | |
| 4665 | Resolve (Lo, Universal_Fixed); | |
| 4666 | else | |
| 4667 | Resolve (Lo, Btyp); | |
| 4668 | end if; | |
| 4669 | ||
| 4670 | -- Set corresponding integer value for bound | |
| 4671 | ||
| 4672 | Set_Corresponding_Integer_Value | |
| 4673 | (Lo, UR_To_Uint (Realval (Lo) / Small)); | |
| 4674 | ||
| 4675 | -- Similar processing for high bound | |
| 4676 | ||
| 4677 | Set_Etype (Hi, Empty); | |
| 4678 | Set_Analyzed (Hi, False); | |
| 4679 | Analyze (Hi); | |
| 4680 | ||
| 4681 | if Typ = Btyp then | |
| 4682 | Resolve (Hi, Universal_Fixed); | |
| 4683 | else | |
| 4684 | Resolve (Hi, Btyp); | |
| 4685 | end if; | |
| 4686 | ||
| 4687 | Set_Corresponding_Integer_Value | |
| 4688 | (Hi, UR_To_Uint (Realval (Hi) / Small)); | |
| 4689 | ||
| 4690 | -- Set type of range to correspond to bounds | |
| 4691 | ||
| 4692 | Set_Etype (Rng, Etype (Lo)); | |
| 4693 | ||
| fbf5a39b | 4694 | -- Set Esize to calculated size if not set already |
| 70482933 | 4695 | |
| fbf5a39b AC |
4696 | if Unknown_Esize (Typ) then |
| 4697 | Init_Esize (Typ, Actual_Size); | |
| 4698 | end if; | |
| 70482933 RK |
4699 | |
| 4700 | -- Set RM_Size if not already set. If already set, check value | |
| 4701 | ||
| 4702 | declare | |
| 4703 | Minsiz : constant Uint := UI_From_Int (Minimum_Size (Typ)); | |
| 4704 | ||
| 4705 | begin | |
| 4706 | if RM_Size (Typ) /= Uint_0 then | |
| 4707 | if RM_Size (Typ) < Minsiz then | |
| 4708 | Error_Msg_Uint_1 := RM_Size (Typ); | |
| 4709 | Error_Msg_Uint_2 := Minsiz; | |
| 4710 | Error_Msg_NE | |
| 7d8b9c99 | 4711 | ("size given (^) for type& too small, minimum allowed is ^", |
| 70482933 RK |
4712 | Size_Clause (Typ), Typ); |
| 4713 | end if; | |
| 4714 | ||
| 4715 | else | |
| 4716 | Set_RM_Size (Typ, Minsiz); | |
| 4717 | end if; | |
| 4718 | end; | |
| 70482933 RK |
4719 | end Freeze_Fixed_Point_Type; |
| 4720 | ||
| 4721 | ------------------ | |
| 4722 | -- Freeze_Itype -- | |
| 4723 | ------------------ | |
| 4724 | ||
| 4725 | procedure Freeze_Itype (T : Entity_Id; N : Node_Id) is | |
| 4726 | L : List_Id; | |
| 4727 | ||
| 4728 | begin | |
| 4729 | Set_Has_Delayed_Freeze (T); | |
| 4730 | L := Freeze_Entity (T, Sloc (N)); | |
| 4731 | ||
| 4732 | if Is_Non_Empty_List (L) then | |
| 4733 | Insert_Actions (N, L); | |
| 4734 | end if; | |
| 4735 | end Freeze_Itype; | |
| 4736 | ||
| 4737 | -------------------------- | |
| 4738 | -- Freeze_Static_Object -- | |
| 4739 | -------------------------- | |
| 4740 | ||
| 4741 | procedure Freeze_Static_Object (E : Entity_Id) is | |
| 4742 | ||
| 4743 | Cannot_Be_Static : exception; | |
| 4744 | -- Exception raised if the type of a static object cannot be made | |
| 4745 | -- static. This happens if the type depends on non-global objects. | |
| 4746 | ||
| 4747 | procedure Ensure_Expression_Is_SA (N : Node_Id); | |
| ee094616 RD |
4748 | -- Called to ensure that an expression used as part of a type definition |
| 4749 | -- is statically allocatable, which means that the expression type is | |
| 4750 | -- statically allocatable, and the expression is either static, or a | |
| 4751 | -- reference to a library level constant. | |
| 70482933 RK |
4752 | |
| 4753 | procedure Ensure_Type_Is_SA (Typ : Entity_Id); | |
| 4754 | -- Called to mark a type as static, checking that it is possible | |
| 4755 | -- to set the type as static. If it is not possible, then the | |
| 4756 | -- exception Cannot_Be_Static is raised. | |
| 4757 | ||
| 4758 | ----------------------------- | |
| 4759 | -- Ensure_Expression_Is_SA -- | |
| 4760 | ----------------------------- | |
| 4761 | ||
| 4762 | procedure Ensure_Expression_Is_SA (N : Node_Id) is | |
| 4763 | Ent : Entity_Id; | |
| 4764 | ||
| 4765 | begin | |
| 4766 | Ensure_Type_Is_SA (Etype (N)); | |
| 4767 | ||
| 4768 | if Is_Static_Expression (N) then | |
| 4769 | return; | |
| 4770 | ||
| 4771 | elsif Nkind (N) = N_Identifier then | |
| 4772 | Ent := Entity (N); | |
| 4773 | ||
| 4774 | if Present (Ent) | |
| 4775 | and then Ekind (Ent) = E_Constant | |
| 4776 | and then Is_Library_Level_Entity (Ent) | |
| 4777 | then | |
| 4778 | return; | |
| 4779 | end if; | |
| 4780 | end if; | |
| 4781 | ||
| 4782 | raise Cannot_Be_Static; | |
| 4783 | end Ensure_Expression_Is_SA; | |
| 4784 | ||
| 4785 | ----------------------- | |
| 4786 | -- Ensure_Type_Is_SA -- | |
| 4787 | ----------------------- | |
| 4788 | ||
| 4789 | procedure Ensure_Type_Is_SA (Typ : Entity_Id) is | |
| 4790 | N : Node_Id; | |
| 4791 | C : Entity_Id; | |
| 4792 | ||
| 4793 | begin | |
| 4794 | -- If type is library level, we are all set | |
| 4795 | ||
| 4796 | if Is_Library_Level_Entity (Typ) then | |
| 4797 | return; | |
| 4798 | end if; | |
| 4799 | ||
| ee094616 RD |
4800 | -- We are also OK if the type already marked as statically allocated, |
| 4801 | -- which means we processed it before. | |
| 70482933 RK |
4802 | |
| 4803 | if Is_Statically_Allocated (Typ) then | |
| 4804 | return; | |
| 4805 | end if; | |
| 4806 | ||
| 4807 | -- Mark type as statically allocated | |
| 4808 | ||
| 4809 | Set_Is_Statically_Allocated (Typ); | |
| 4810 | ||
| 4811 | -- Check that it is safe to statically allocate this type | |
| 4812 | ||
| 4813 | if Is_Scalar_Type (Typ) or else Is_Real_Type (Typ) then | |
| 4814 | Ensure_Expression_Is_SA (Type_Low_Bound (Typ)); | |
| 4815 | Ensure_Expression_Is_SA (Type_High_Bound (Typ)); | |
| 4816 | ||
| 4817 | elsif Is_Array_Type (Typ) then | |
| 4818 | N := First_Index (Typ); | |
| 4819 | while Present (N) loop | |
| 4820 | Ensure_Type_Is_SA (Etype (N)); | |
| 4821 | Next_Index (N); | |
| 4822 | end loop; | |
| 4823 | ||
| 4824 | Ensure_Type_Is_SA (Component_Type (Typ)); | |
| 4825 | ||
| 4826 | elsif Is_Access_Type (Typ) then | |
| 4827 | if Ekind (Designated_Type (Typ)) = E_Subprogram_Type then | |
| 4828 | ||
| 4829 | declare | |
| 4830 | F : Entity_Id; | |
| 4831 | T : constant Entity_Id := Etype (Designated_Type (Typ)); | |
| 4832 | ||
| 4833 | begin | |
| 4834 | if T /= Standard_Void_Type then | |
| 4835 | Ensure_Type_Is_SA (T); | |
| 4836 | end if; | |
| 4837 | ||
| 4838 | F := First_Formal (Designated_Type (Typ)); | |
| 4839 | ||
| 4840 | while Present (F) loop | |
| 4841 | Ensure_Type_Is_SA (Etype (F)); | |
| 4842 | Next_Formal (F); | |
| 4843 | end loop; | |
| 4844 | end; | |
| 4845 | ||
| 4846 | else | |
| 4847 | Ensure_Type_Is_SA (Designated_Type (Typ)); | |
| 4848 | end if; | |
| 4849 | ||
| 4850 | elsif Is_Record_Type (Typ) then | |
| 4851 | C := First_Entity (Typ); | |
| 70482933 RK |
4852 | while Present (C) loop |
| 4853 | if Ekind (C) = E_Discriminant | |
| 4854 | or else Ekind (C) = E_Component | |
| 4855 | then | |
| 4856 | Ensure_Type_Is_SA (Etype (C)); | |
| 4857 | ||
| 4858 | elsif Is_Type (C) then | |
| 4859 | Ensure_Type_Is_SA (C); | |
| 4860 | end if; | |
| 4861 | ||
| 4862 | Next_Entity (C); | |
| 4863 | end loop; | |
| 4864 | ||
| 4865 | elsif Ekind (Typ) = E_Subprogram_Type then | |
| 4866 | Ensure_Type_Is_SA (Etype (Typ)); | |
| 4867 | ||
| 4868 | C := First_Formal (Typ); | |
| 4869 | while Present (C) loop | |
| 4870 | Ensure_Type_Is_SA (Etype (C)); | |
| 4871 | Next_Formal (C); | |
| 4872 | end loop; | |
| 4873 | ||
| 4874 | else | |
| 4875 | raise Cannot_Be_Static; | |
| 4876 | end if; | |
| 4877 | end Ensure_Type_Is_SA; | |
| 4878 | ||
| 4879 | -- Start of processing for Freeze_Static_Object | |
| 4880 | ||
| 4881 | begin | |
| 4882 | Ensure_Type_Is_SA (Etype (E)); | |
| 4883 | ||
| 4884 | exception | |
| 4885 | when Cannot_Be_Static => | |
| 4886 | ||
| 4887 | -- If the object that cannot be static is imported or exported, | |
| 4888 | -- then we give an error message saying that this object cannot | |
| 4889 | -- be imported or exported. | |
| 4890 | ||
| 4891 | if Is_Imported (E) then | |
| 4892 | Error_Msg_N | |
| 4893 | ("& cannot be imported (local type is not constant)", E); | |
| 4894 | ||
| 4895 | -- Otherwise must be exported, something is wrong if compiler | |
| 4896 | -- is marking something as statically allocated which cannot be). | |
| 4897 | ||
| 4898 | else pragma Assert (Is_Exported (E)); | |
| 4899 | Error_Msg_N | |
| 4900 | ("& cannot be exported (local type is not constant)", E); | |
| 4901 | end if; | |
| 4902 | end Freeze_Static_Object; | |
| 4903 | ||
| 4904 | ----------------------- | |
| 4905 | -- Freeze_Subprogram -- | |
| 4906 | ----------------------- | |
| 4907 | ||
| 4908 | procedure Freeze_Subprogram (E : Entity_Id) is | |
| 4909 | Retype : Entity_Id; | |
| 4910 | F : Entity_Id; | |
| 4911 | ||
| 4912 | begin | |
| 4913 | -- Subprogram may not have an address clause unless it is imported | |
| 4914 | ||
| 4915 | if Present (Address_Clause (E)) then | |
| 4916 | if not Is_Imported (E) then | |
| 4917 | Error_Msg_N | |
| 4918 | ("address clause can only be given " & | |
| 4919 | "for imported subprogram", | |
| 4920 | Name (Address_Clause (E))); | |
| 4921 | end if; | |
| 4922 | end if; | |
| 4923 | ||
| 91b1417d AC |
4924 | -- Reset the Pure indication on an imported subprogram unless an |
| 4925 | -- explicit Pure_Function pragma was present. We do this because | |
| ee094616 RD |
4926 | -- otherwise it is an insidious error to call a non-pure function from |
| 4927 | -- pure unit and have calls mysteriously optimized away. What happens | |
| 4928 | -- here is that the Import can bypass the normal check to ensure that | |
| 4929 | -- pure units call only pure subprograms. | |
| 91b1417d AC |
4930 | |
| 4931 | if Is_Imported (E) | |
| 4932 | and then Is_Pure (E) | |
| 4933 | and then not Has_Pragma_Pure_Function (E) | |
| 4934 | then | |
| 4935 | Set_Is_Pure (E, False); | |
| 4936 | end if; | |
| 4937 | ||
| 70482933 RK |
4938 | -- For non-foreign convention subprograms, this is where we create |
| 4939 | -- the extra formals (for accessibility level and constrained bit | |
| 4940 | -- information). We delay this till the freeze point precisely so | |
| 4941 | -- that we know the convention! | |
| 4942 | ||
| 4943 | if not Has_Foreign_Convention (E) then | |
| 4944 | Create_Extra_Formals (E); | |
| 4945 | Set_Mechanisms (E); | |
| 4946 | ||
| 4947 | -- If this is convention Ada and a Valued_Procedure, that's odd | |
| 4948 | ||
| 4949 | if Ekind (E) = E_Procedure | |
| 4950 | and then Is_Valued_Procedure (E) | |
| 4951 | and then Convention (E) = Convention_Ada | |
| fbf5a39b | 4952 | and then Warn_On_Export_Import |
| 70482933 RK |
4953 | then |
| 4954 | Error_Msg_N | |
| 4955 | ("?Valued_Procedure has no effect for convention Ada", E); | |
| 4956 | Set_Is_Valued_Procedure (E, False); | |
| 4957 | end if; | |
| 4958 | ||
| 4959 | -- Case of foreign convention | |
| 4960 | ||
| 4961 | else | |
| 4962 | Set_Mechanisms (E); | |
| 4963 | ||
| fbf5a39b | 4964 | -- For foreign conventions, warn about return of an |
| 70482933 RK |
4965 | -- unconstrained array. |
| 4966 | ||
| 4967 | -- Note: we *do* allow a return by descriptor for the VMS case, | |
| 4968 | -- though here there is probably more to be done ??? | |
| 4969 | ||
| 4970 | if Ekind (E) = E_Function then | |
| 4971 | Retype := Underlying_Type (Etype (E)); | |
| 4972 | ||
| 4973 | -- If no return type, probably some other error, e.g. a | |
| 4974 | -- missing full declaration, so ignore. | |
| 4975 | ||
| 4976 | if No (Retype) then | |
| 4977 | null; | |
| 4978 | ||
| 4979 | -- If the return type is generic, we have emitted a warning | |
| edd63e9b ES |
4980 | -- earlier on, and there is nothing else to check here. Specific |
| 4981 | -- instantiations may lead to erroneous behavior. | |
| 70482933 RK |
4982 | |
| 4983 | elsif Is_Generic_Type (Etype (E)) then | |
| 4984 | null; | |
| 4985 | ||
| 4986 | elsif Is_Array_Type (Retype) | |
| 4987 | and then not Is_Constrained (Retype) | |
| 4988 | and then Mechanism (E) not in Descriptor_Codes | |
| fbf5a39b | 4989 | and then Warn_On_Export_Import |
| 70482933 | 4990 | then |
| fbf5a39b AC |
4991 | Error_Msg_N |
| 4992 | ("?foreign convention function& should not return " & | |
| 4993 | "unconstrained array", E); | |
| 70482933 RK |
4994 | return; |
| 4995 | end if; | |
| 4996 | end if; | |
| 4997 | ||
| 4998 | -- If any of the formals for an exported foreign convention | |
| edd63e9b ES |
4999 | -- subprogram have defaults, then emit an appropriate warning since |
| 5000 | -- this is odd (default cannot be used from non-Ada code) | |
| 70482933 RK |
5001 | |
| 5002 | if Is_Exported (E) then | |
| 5003 | F := First_Formal (E); | |
| 5004 | while Present (F) loop | |
| fbf5a39b AC |
5005 | if Warn_On_Export_Import |
| 5006 | and then Present (Default_Value (F)) | |
| 5007 | then | |
| 70482933 RK |
5008 | Error_Msg_N |
| 5009 | ("?parameter cannot be defaulted in non-Ada call", | |
| 5010 | Default_Value (F)); | |
| 5011 | end if; | |
| 5012 | ||
| 5013 | Next_Formal (F); | |
| 5014 | end loop; | |
| 5015 | end if; | |
| 5016 | end if; | |
| 5017 | ||
| 5018 | -- For VMS, descriptor mechanisms for parameters are allowed only | |
| 7d8b9c99 RD |
5019 | -- for imported/exported subprograms. Moreover, the NCA descriptor |
| 5020 | -- is not allowed for parameters of exported subprograms. | |
| 70482933 RK |
5021 | |
| 5022 | if OpenVMS_On_Target then | |
| 7d8b9c99 RD |
5023 | if Is_Exported (E) then |
| 5024 | F := First_Formal (E); | |
| 5025 | while Present (F) loop | |
| 5026 | if Mechanism (F) = By_Descriptor_NCA then | |
| 5027 | Error_Msg_N | |
| 5028 | ("'N'C'A' descriptor for parameter not permitted", F); | |
| 5029 | Error_Msg_N | |
| 5030 | ("\can only be used for imported subprogram", F); | |
| 5031 | end if; | |
| 5032 | ||
| 5033 | Next_Formal (F); | |
| 5034 | end loop; | |
| 5035 | ||
| 5036 | elsif not Is_Imported (E) then | |
| 70482933 RK |
5037 | F := First_Formal (E); |
| 5038 | while Present (F) loop | |
| 5039 | if Mechanism (F) in Descriptor_Codes then | |
| 5040 | Error_Msg_N | |
| 5041 | ("descriptor mechanism for parameter not permitted", F); | |
| 5042 | Error_Msg_N | |
| 7d8b9c99 | 5043 | ("\can only be used for imported/exported subprogram", F); |
| 70482933 RK |
5044 | end if; |
| 5045 | ||
| 5046 | Next_Formal (F); | |
| 5047 | end loop; | |
| 5048 | end if; | |
| 5049 | end if; | |
| edd63e9b ES |
5050 | |
| 5051 | -- Pragma Inline_Always is disallowed for dispatching subprograms | |
| 5052 | -- because the address of such subprograms is saved in the dispatch | |
| 5053 | -- table to support dispatching calls, and dispatching calls cannot | |
| 5054 | -- be inlined. This is consistent with the restriction against using | |
| 5055 | -- 'Access or 'Address on an Inline_Always subprogram. | |
| 5056 | ||
| def46b54 RD |
5057 | if Is_Dispatching_Operation (E) |
| 5058 | and then Has_Pragma_Inline_Always (E) | |
| 5059 | then | |
| edd63e9b ES |
5060 | Error_Msg_N |
| 5061 | ("pragma Inline_Always not allowed for dispatching subprograms", E); | |
| 5062 | end if; | |
| c6a9797e RD |
5063 | |
| 5064 | -- Because of the implicit representation of inherited predefined | |
| 5065 | -- operators in the front-end, the overriding status of the operation | |
| 5066 | -- may be affected when a full view of a type is analyzed, and this is | |
| 5067 | -- not captured by the analysis of the corresponding type declaration. | |
| 5068 | -- Therefore the correctness of a not-overriding indicator must be | |
| 5069 | -- rechecked when the subprogram is frozen. | |
| 5070 | ||
| 5071 | if Nkind (E) = N_Defining_Operator_Symbol | |
| 5072 | and then not Error_Posted (Parent (E)) | |
| 5073 | then | |
| 5074 | Check_Overriding_Indicator (E, Empty, Is_Primitive (E)); | |
| 5075 | end if; | |
| 70482933 RK |
5076 | end Freeze_Subprogram; |
| 5077 | ||
| 15ce9ca2 AC |
5078 | ---------------------- |
| 5079 | -- Is_Fully_Defined -- | |
| 5080 | ---------------------- | |
| 70482933 | 5081 | |
| 70482933 RK |
5082 | function Is_Fully_Defined (T : Entity_Id) return Boolean is |
| 5083 | begin | |
| 5084 | if Ekind (T) = E_Class_Wide_Type then | |
| 5085 | return Is_Fully_Defined (Etype (T)); | |
| 657a9dd9 AC |
5086 | |
| 5087 | elsif Is_Array_Type (T) then | |
| 5088 | return Is_Fully_Defined (Component_Type (T)); | |
| 5089 | ||
| 5090 | elsif Is_Record_Type (T) | |
| 5091 | and not Is_Private_Type (T) | |
| 5092 | then | |
| ee094616 RD |
5093 | -- Verify that the record type has no components with private types |
| 5094 | -- without completion. | |
| 657a9dd9 AC |
5095 | |
| 5096 | declare | |
| 5097 | Comp : Entity_Id; | |
| bde58e32 | 5098 | |
| 657a9dd9 AC |
5099 | begin |
| 5100 | Comp := First_Component (T); | |
| 5101 | ||
| 5102 | while Present (Comp) loop | |
| 5103 | if not Is_Fully_Defined (Etype (Comp)) then | |
| 5104 | return False; | |
| 5105 | end if; | |
| 5106 | ||
| 5107 | Next_Component (Comp); | |
| 5108 | end loop; | |
| 5109 | return True; | |
| 5110 | end; | |
| 5111 | ||
| 86cde7b1 RD |
5112 | else |
| 5113 | return not Is_Private_Type (T) | |
| 5114 | or else Present (Full_View (Base_Type (T))); | |
| 70482933 RK |
5115 | end if; |
| 5116 | end Is_Fully_Defined; | |
| 5117 | ||
| 70d904ca | 5118 | --------------------------------- |
| 70482933 RK |
5119 | -- Process_Default_Expressions -- |
| 5120 | --------------------------------- | |
| 5121 | ||
| 5122 | procedure Process_Default_Expressions | |
| 5123 | (E : Entity_Id; | |
| 5124 | After : in out Node_Id) | |
| 5125 | is | |
| 5126 | Loc : constant Source_Ptr := Sloc (E); | |
| 5127 | Dbody : Node_Id; | |
| 5128 | Formal : Node_Id; | |
| 5129 | Dcopy : Node_Id; | |
| 5130 | Dnam : Entity_Id; | |
| 5131 | ||
| 5132 | begin | |
| 5133 | Set_Default_Expressions_Processed (E); | |
| 5134 | ||
| ee094616 RD |
5135 | -- A subprogram instance and its associated anonymous subprogram share |
| 5136 | -- their signature. The default expression functions are defined in the | |
| 5137 | -- wrapper packages for the anonymous subprogram, and should not be | |
| 5138 | -- generated again for the instance. | |
| 70482933 RK |
5139 | |
| 5140 | if Is_Generic_Instance (E) | |
| 5141 | and then Present (Alias (E)) | |
| 5142 | and then Default_Expressions_Processed (Alias (E)) | |
| 5143 | then | |
| 5144 | return; | |
| 5145 | end if; | |
| 5146 | ||
| 5147 | Formal := First_Formal (E); | |
| 70482933 RK |
5148 | while Present (Formal) loop |
| 5149 | if Present (Default_Value (Formal)) then | |
| 5150 | ||
| 5151 | -- We work with a copy of the default expression because we | |
| 5152 | -- do not want to disturb the original, since this would mess | |
| 5153 | -- up the conformance checking. | |
| 5154 | ||
| 5155 | Dcopy := New_Copy_Tree (Default_Value (Formal)); | |
| 5156 | ||
| 5157 | -- The analysis of the expression may generate insert actions, | |
| 5158 | -- which of course must not be executed. We wrap those actions | |
| 5159 | -- in a procedure that is not called, and later on eliminated. | |
| 5160 | -- The following cases have no side-effects, and are analyzed | |
| 5161 | -- directly. | |
| 5162 | ||
| 5163 | if Nkind (Dcopy) = N_Identifier | |
| 5164 | or else Nkind (Dcopy) = N_Expanded_Name | |
| 5165 | or else Nkind (Dcopy) = N_Integer_Literal | |
| 5166 | or else (Nkind (Dcopy) = N_Real_Literal | |
| 5167 | and then not Vax_Float (Etype (Dcopy))) | |
| 5168 | or else Nkind (Dcopy) = N_Character_Literal | |
| 5169 | or else Nkind (Dcopy) = N_String_Literal | |
| 86cde7b1 | 5170 | or else Known_Null (Dcopy) |
| 70482933 RK |
5171 | or else (Nkind (Dcopy) = N_Attribute_Reference |
| 5172 | and then | |
| 5173 | Attribute_Name (Dcopy) = Name_Null_Parameter) | |
| 70482933 RK |
5174 | then |
| 5175 | ||
| 5176 | -- If there is no default function, we must still do a full | |
| ee094616 RD |
5177 | -- analyze call on the default value, to ensure that all error |
| 5178 | -- checks are performed, e.g. those associated with static | |
| 5179 | -- evaluation. Note: this branch will always be taken if the | |
| 5180 | -- analyzer is turned off (but we still need the error checks). | |
| 70482933 RK |
5181 | |
| 5182 | -- Note: the setting of parent here is to meet the requirement | |
| 5183 | -- that we can only analyze the expression while attached to | |
| 5184 | -- the tree. Really the requirement is that the parent chain | |
| 5185 | -- be set, we don't actually need to be in the tree. | |
| 5186 | ||
| 5187 | Set_Parent (Dcopy, Declaration_Node (Formal)); | |
| 5188 | Analyze (Dcopy); | |
| 5189 | ||
| 5190 | -- Default expressions are resolved with their own type if the | |
| 5191 | -- context is generic, to avoid anomalies with private types. | |
| 5192 | ||
| 5193 | if Ekind (Scope (E)) = E_Generic_Package then | |
| fbf5a39b | 5194 | Resolve (Dcopy); |
| 70482933 RK |
5195 | else |
| 5196 | Resolve (Dcopy, Etype (Formal)); | |
| 5197 | end if; | |
| 5198 | ||
| 5199 | -- If that resolved expression will raise constraint error, | |
| 5200 | -- then flag the default value as raising constraint error. | |
| 5201 | -- This allows a proper error message on the calls. | |
| 5202 | ||
| 5203 | if Raises_Constraint_Error (Dcopy) then | |
| 5204 | Set_Raises_Constraint_Error (Default_Value (Formal)); | |
| 5205 | end if; | |
| 5206 | ||
| 5207 | -- If the default is a parameterless call, we use the name of | |
| 5208 | -- the called function directly, and there is no body to build. | |
| 5209 | ||
| 5210 | elsif Nkind (Dcopy) = N_Function_Call | |
| 5211 | and then No (Parameter_Associations (Dcopy)) | |
| 5212 | then | |
| 5213 | null; | |
| 5214 | ||
| 5215 | -- Else construct and analyze the body of a wrapper procedure | |
| 5216 | -- that contains an object declaration to hold the expression. | |
| 5217 | -- Given that this is done only to complete the analysis, it | |
| 5218 | -- simpler to build a procedure than a function which might | |
| 5219 | -- involve secondary stack expansion. | |
| 5220 | ||
| 5221 | else | |
| 5222 | Dnam := | |
| 5223 | Make_Defining_Identifier (Loc, New_Internal_Name ('D')); | |
| 5224 | ||
| 5225 | Dbody := | |
| 5226 | Make_Subprogram_Body (Loc, | |
| 5227 | Specification => | |
| 5228 | Make_Procedure_Specification (Loc, | |
| 5229 | Defining_Unit_Name => Dnam), | |
| 5230 | ||
| 5231 | Declarations => New_List ( | |
| 5232 | Make_Object_Declaration (Loc, | |
| 5233 | Defining_Identifier => | |
| 5234 | Make_Defining_Identifier (Loc, | |
| 5235 | New_Internal_Name ('T')), | |
| 5236 | Object_Definition => | |
| 5237 | New_Occurrence_Of (Etype (Formal), Loc), | |
| 5238 | Expression => New_Copy_Tree (Dcopy))), | |
| 5239 | ||
| 5240 | Handled_Statement_Sequence => | |
| 5241 | Make_Handled_Sequence_Of_Statements (Loc, | |
| 5242 | Statements => New_List)); | |
| 5243 | ||
| 5244 | Set_Scope (Dnam, Scope (E)); | |
| 5245 | Set_Assignment_OK (First (Declarations (Dbody))); | |
| 5246 | Set_Is_Eliminated (Dnam); | |
| 5247 | Insert_After (After, Dbody); | |
| 5248 | Analyze (Dbody); | |
| 5249 | After := Dbody; | |
| 5250 | end if; | |
| 5251 | end if; | |
| 5252 | ||
| 5253 | Next_Formal (Formal); | |
| 5254 | end loop; | |
| 70482933 RK |
5255 | end Process_Default_Expressions; |
| 5256 | ||
| 5257 | ---------------------------------------- | |
| 5258 | -- Set_Component_Alignment_If_Not_Set -- | |
| 5259 | ---------------------------------------- | |
| 5260 | ||
| 5261 | procedure Set_Component_Alignment_If_Not_Set (Typ : Entity_Id) is | |
| 5262 | begin | |
| 5263 | -- Ignore if not base type, subtypes don't need anything | |
| 5264 | ||
| 5265 | if Typ /= Base_Type (Typ) then | |
| 5266 | return; | |
| 5267 | end if; | |
| 5268 | ||
| 5269 | -- Do not override existing representation | |
| 5270 | ||
| 5271 | if Is_Packed (Typ) then | |
| 5272 | return; | |
| 5273 | ||
| 5274 | elsif Has_Specified_Layout (Typ) then | |
| 5275 | return; | |
| 5276 | ||
| 5277 | elsif Component_Alignment (Typ) /= Calign_Default then | |
| 5278 | return; | |
| 5279 | ||
| 5280 | else | |
| 5281 | Set_Component_Alignment | |
| 5282 | (Typ, Scope_Stack.Table | |
| 5283 | (Scope_Stack.Last).Component_Alignment_Default); | |
| 5284 | end if; | |
| 5285 | end Set_Component_Alignment_If_Not_Set; | |
| 5286 | ||
| c6823a20 EB |
5287 | ------------------ |
| 5288 | -- Undelay_Type -- | |
| 5289 | ------------------ | |
| 5290 | ||
| 5291 | procedure Undelay_Type (T : Entity_Id) is | |
| 5292 | begin | |
| 5293 | Set_Has_Delayed_Freeze (T, False); | |
| 5294 | Set_Freeze_Node (T, Empty); | |
| 5295 | ||
| 5296 | -- Since we don't want T to have a Freeze_Node, we don't want its | |
| 5297 | -- Full_View or Corresponding_Record_Type to have one either. | |
| 5298 | ||
| 5299 | -- ??? Fundamentally, this whole handling is a kludge. What we really | |
| ee094616 RD |
5300 | -- want is to be sure that for an Itype that's part of record R and is a |
| 5301 | -- subtype of type T, that it's frozen after the later of the freeze | |
| c6823a20 EB |
5302 | -- points of R and T. We have no way of doing that directly, so what we |
| 5303 | -- do is force most such Itypes to be frozen as part of freezing R via | |
| 5304 | -- this procedure and only delay the ones that need to be delayed | |
| ee094616 RD |
5305 | -- (mostly the designated types of access types that are defined as part |
| 5306 | -- of the record). | |
| c6823a20 EB |
5307 | |
| 5308 | if Is_Private_Type (T) | |
| 5309 | and then Present (Full_View (T)) | |
| 5310 | and then Is_Itype (Full_View (T)) | |
| 5311 | and then Is_Record_Type (Scope (Full_View (T))) | |
| 5312 | then | |
| 5313 | Undelay_Type (Full_View (T)); | |
| 5314 | end if; | |
| 5315 | ||
| 5316 | if Is_Concurrent_Type (T) | |
| 5317 | and then Present (Corresponding_Record_Type (T)) | |
| 5318 | and then Is_Itype (Corresponding_Record_Type (T)) | |
| 5319 | and then Is_Record_Type (Scope (Corresponding_Record_Type (T))) | |
| 5320 | then | |
| 5321 | Undelay_Type (Corresponding_Record_Type (T)); | |
| 5322 | end if; | |
| 5323 | end Undelay_Type; | |
| 5324 | ||
| fbf5a39b AC |
5325 | ------------------ |
| 5326 | -- Warn_Overlay -- | |
| 5327 | ------------------ | |
| 5328 | ||
| 5329 | procedure Warn_Overlay | |
| 5330 | (Expr : Node_Id; | |
| 5331 | Typ : Entity_Id; | |
| 5332 | Nam : Entity_Id) | |
| 5333 | is | |
| 5334 | Ent : constant Entity_Id := Entity (Nam); | |
| 49e90211 | 5335 | -- The object to which the address clause applies |
| fbf5a39b AC |
5336 | |
| 5337 | Init : Node_Id; | |
| 5338 | Old : Entity_Id := Empty; | |
| 5339 | Decl : Node_Id; | |
| 5340 | ||
| 5341 | begin | |
| 5342 | -- No warning if address clause overlay warnings are off | |
| 5343 | ||
| 5344 | if not Address_Clause_Overlay_Warnings then | |
| 5345 | return; | |
| 5346 | end if; | |
| 5347 | ||
| 5348 | -- No warning if there is an explicit initialization | |
| 5349 | ||
| 5350 | Init := Original_Node (Expression (Declaration_Node (Ent))); | |
| 5351 | ||
| 5352 | if Present (Init) and then Comes_From_Source (Init) then | |
| 5353 | return; | |
| 5354 | end if; | |
| 5355 | ||
| edd63e9b | 5356 | -- We only give the warning for non-imported entities of a type for |
| 0ac73189 AC |
5357 | -- which a non-null base init proc is defined, or for objects of access |
| 5358 | -- types with implicit null initialization, or when Initialize_Scalars | |
| 5359 | -- applies and the type is scalar or a string type (the latter being | |
| 5360 | -- tested for because predefined String types are initialized by inline | |
| 5361 | -- code rather than by an init_proc). | |
| fbf5a39b AC |
5362 | |
| 5363 | if Present (Expr) | |
| fbf5a39b | 5364 | and then not Is_Imported (Ent) |
| 0ac73189 AC |
5365 | and then (Has_Non_Null_Base_Init_Proc (Typ) |
| 5366 | or else Is_Access_Type (Typ) | |
| 5367 | or else (Init_Or_Norm_Scalars | |
| 5368 | and then (Is_Scalar_Type (Typ) | |
| 5369 | or else Is_String_Type (Typ)))) | |
| fbf5a39b AC |
5370 | then |
| 5371 | if Nkind (Expr) = N_Attribute_Reference | |
| 5372 | and then Is_Entity_Name (Prefix (Expr)) | |
| 5373 | then | |
| 5374 | Old := Entity (Prefix (Expr)); | |
| 5375 | ||
| 5376 | elsif Is_Entity_Name (Expr) | |
| 5377 | and then Ekind (Entity (Expr)) = E_Constant | |
| 5378 | then | |
| 5379 | Decl := Declaration_Node (Entity (Expr)); | |
| 5380 | ||
| 5381 | if Nkind (Decl) = N_Object_Declaration | |
| 5382 | and then Present (Expression (Decl)) | |
| 5383 | and then Nkind (Expression (Decl)) = N_Attribute_Reference | |
| 5384 | and then Is_Entity_Name (Prefix (Expression (Decl))) | |
| 5385 | then | |
| 5386 | Old := Entity (Prefix (Expression (Decl))); | |
| 5387 | ||
| 5388 | elsif Nkind (Expr) = N_Function_Call then | |
| 5389 | return; | |
| 5390 | end if; | |
| 5391 | ||
| ee094616 RD |
5392 | -- A function call (most likely to To_Address) is probably not an |
| 5393 | -- overlay, so skip warning. Ditto if the function call was inlined | |
| 5394 | -- and transformed into an entity. | |
| fbf5a39b AC |
5395 | |
| 5396 | elsif Nkind (Original_Node (Expr)) = N_Function_Call then | |
| 5397 | return; | |
| 5398 | end if; | |
| 5399 | ||
| 5400 | Decl := Next (Parent (Expr)); | |
| 5401 | ||
| 5402 | -- If a pragma Import follows, we assume that it is for the current | |
| 5403 | -- target of the address clause, and skip the warning. | |
| 5404 | ||
| 5405 | if Present (Decl) | |
| 5406 | and then Nkind (Decl) = N_Pragma | |
| 1b24ada5 | 5407 | and then Pragma_Name (Decl) = Name_Import |
| fbf5a39b AC |
5408 | then |
| 5409 | return; | |
| 5410 | end if; | |
| 5411 | ||
| 5412 | if Present (Old) then | |
| 5413 | Error_Msg_Node_2 := Old; | |
| 5414 | Error_Msg_N | |
| 5415 | ("default initialization of & may modify &?", | |
| 5416 | Nam); | |
| 5417 | else | |
| 5418 | Error_Msg_N | |
| 5419 | ("default initialization of & may modify overlaid storage?", | |
| 5420 | Nam); | |
| 5421 | end if; | |
| 5422 | ||
| 5423 | -- Add friendly warning if initialization comes from a packed array | |
| 5424 | -- component. | |
| 5425 | ||
| 5426 | if Is_Record_Type (Typ) then | |
| 5427 | declare | |
| 5428 | Comp : Entity_Id; | |
| 5429 | ||
| 5430 | begin | |
| 5431 | Comp := First_Component (Typ); | |
| 5432 | ||
| 5433 | while Present (Comp) loop | |
| 5434 | if Nkind (Parent (Comp)) = N_Component_Declaration | |
| 5435 | and then Present (Expression (Parent (Comp))) | |
| 5436 | then | |
| 5437 | exit; | |
| 5438 | elsif Is_Array_Type (Etype (Comp)) | |
| 5439 | and then Present (Packed_Array_Type (Etype (Comp))) | |
| 5440 | then | |
| 5441 | Error_Msg_NE | |
| 3f1ede06 RD |
5442 | ("\packed array component& " & |
| 5443 | "will be initialized to zero?", | |
| 5444 | Nam, Comp); | |
| fbf5a39b AC |
5445 | exit; |
| 5446 | else | |
| 5447 | Next_Component (Comp); | |
| 5448 | end if; | |
| 5449 | end loop; | |
| 5450 | end; | |
| 5451 | end if; | |
| 5452 | ||
| 5453 | Error_Msg_N | |
| 3f1ede06 | 5454 | ("\use pragma Import for & to " & |
| 86cde7b1 | 5455 | "suppress initialization (RM B.1(24))?", |
| 3f1ede06 | 5456 | Nam); |
| fbf5a39b AC |
5457 | end if; |
| 5458 | end Warn_Overlay; | |
| 5459 | ||
| 70482933 | 5460 | end Freeze; |