1------------------------------------------------------------------------------ 2-- -- 3-- GNAT COMPILER COMPONENTS -- 4-- -- 5-- S E M _ C A T -- 6-- -- 7-- B o d y -- 8-- -- 9-- Copyright (C) 1992-2015, Free Software Foundation, Inc. -- 10-- -- 11-- GNAT is free software; you can redistribute it and/or modify it under -- 12-- terms of the GNU General Public License as published by the Free Soft- -- 13-- ware Foundation; either version 3, or (at your option) any later ver- -- 14-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 15-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 16-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- 17-- for more details. You should have received a copy of the GNU General -- 18-- Public License distributed with GNAT; see file COPYING3. If not, go to -- 19-- http://www.gnu.org/licenses for a complete copy of the license. -- 20-- -- 21-- GNAT was originally developed by the GNAT team at New York University. -- 22-- Extensive contributions were provided by Ada Core Technologies Inc. -- 23-- -- 24------------------------------------------------------------------------------ 25 26with Atree; use Atree; 27with Debug; use Debug; 28with Einfo; use Einfo; 29with Elists; use Elists; 30with Errout; use Errout; 31with Exp_Disp; use Exp_Disp; 32with Fname; use Fname; 33with Lib; use Lib; 34with Namet; use Namet; 35with Nlists; use Nlists; 36with Opt; use Opt; 37with Sem; use Sem; 38with Sem_Attr; use Sem_Attr; 39with Sem_Aux; use Sem_Aux; 40with Sem_Dist; use Sem_Dist; 41with Sem_Eval; use Sem_Eval; 42with Sem_Util; use Sem_Util; 43with Sinfo; use Sinfo; 44with Snames; use Snames; 45with Stand; use Stand; 46 47package body Sem_Cat is 48 49 ----------------------- 50 -- Local Subprograms -- 51 ----------------------- 52 53 procedure Check_Categorization_Dependencies 54 (Unit_Entity : Entity_Id; 55 Depended_Entity : Entity_Id; 56 Info_Node : Node_Id; 57 Is_Subunit : Boolean); 58 -- This procedure checks that the categorization of a lib unit and that 59 -- of the depended unit satisfy dependency restrictions. 60 -- The depended_entity can be the entity in a with_clause item, in which 61 -- case Info_Node denotes that item. The depended_entity can also be the 62 -- parent unit of a child unit, in which case Info_Node is the declaration 63 -- of the child unit. The error message is posted on Info_Node, and is 64 -- specialized if Is_Subunit is true. 65 66 procedure Check_Non_Static_Default_Expr 67 (Type_Def : Node_Id; 68 Obj_Decl : Node_Id); 69 -- Iterate through the component list of a record definition, check 70 -- that no component is declared with a nonstatic default value. 71 -- If a nonstatic default exists, report an error on Obj_Decl. 72 73 function Has_Read_Write_Attributes (E : Entity_Id) return Boolean; 74 -- Return True if entity has attribute definition clauses for Read and 75 -- Write attributes that are visible at some place. 76 77 function Is_Non_Remote_Access_Type (E : Entity_Id) return Boolean; 78 -- Returns true if the entity is a type whose full view is a non-remote 79 -- access type, for the purpose of enforcing E.2.2(8) rules. 80 81 function Has_Non_Remote_Access (Typ : Entity_Id) return Boolean; 82 -- Return true if Typ or the type of any of its subcomponents is a non 83 -- remote access type and doesn't have user-defined stream attributes. 84 85 function No_External_Streaming (E : Entity_Id) return Boolean; 86 -- Return True if the entity or one of its subcomponents does not support 87 -- external streaming. 88 89 function In_RCI_Declaration return Boolean; 90 function In_RT_Declaration return Boolean; 91 -- Determine if current scope is within the declaration of a Remote Call 92 -- Interface or Remote Types unit, for semantic checking purposes. 93 94 function In_Package_Declaration return Boolean; 95 -- Shared supporting routine for In_RCI_Declaration and In_RT_Declaration 96 97 function In_Shared_Passive_Unit return Boolean; 98 -- Determines if current scope is within a Shared Passive compilation unit 99 100 function Static_Discriminant_Expr (L : List_Id) return Boolean; 101 -- Iterate through the list of discriminants to check if any of them 102 -- contains non-static default expression, which is a violation in 103 -- a preelaborated library unit. 104 105 procedure Validate_Remote_Access_Object_Type_Declaration (T : Entity_Id); 106 -- Check validity of declaration if RCI or RT unit. It should not contain 107 -- the declaration of an access-to-object type unless it is a general 108 -- access type that designates a class-wide limited private type. There are 109 -- also constraints about the primitive subprograms of the class-wide type. 110 -- RM E.2 (9, 13, 14) 111 112 procedure Validate_RACW_Primitive 113 (Subp : Entity_Id; 114 RACW : Entity_Id); 115 -- Check legality of the declaration of primitive Subp of the designated 116 -- type of the given RACW type. 117 118 --------------------------------------- 119 -- Check_Categorization_Dependencies -- 120 --------------------------------------- 121 122 procedure Check_Categorization_Dependencies 123 (Unit_Entity : Entity_Id; 124 Depended_Entity : Entity_Id; 125 Info_Node : Node_Id; 126 Is_Subunit : Boolean) 127 is 128 N : constant Node_Id := Info_Node; 129 Err : Boolean; 130 131 -- Here we define an enumeration type to represent categorization types, 132 -- ordered so that a unit with a given categorization can only WITH 133 -- units with lower or equal categorization type. 134 135 type Categorization is 136 (Pure, 137 Shared_Passive, 138 Remote_Types, 139 Remote_Call_Interface, 140 Normal); 141 142 function Get_Categorization (E : Entity_Id) return Categorization; 143 -- Check categorization flags from entity, and return in the form 144 -- of the lowest value of the Categorization type that applies to E. 145 146 ------------------------ 147 -- Get_Categorization -- 148 ------------------------ 149 150 function Get_Categorization (E : Entity_Id) return Categorization is 151 begin 152 -- Get the lowest categorization that corresponds to E. Note that 153 -- nothing prevents several (different) categorization pragmas 154 -- to apply to the same library unit, in which case the unit has 155 -- all associated categories, so we need to be careful here to 156 -- check pragmas in proper Categorization order in order to 157 -- return the lowest applicable value. 158 159 -- Ignore Pure specification if set by pragma Pure_Function 160 161 if Is_Pure (E) 162 and then not 163 (Has_Pragma_Pure_Function (E) and not Has_Pragma_Pure (E)) 164 then 165 return Pure; 166 167 elsif Is_Shared_Passive (E) then 168 return Shared_Passive; 169 170 elsif Is_Remote_Types (E) then 171 return Remote_Types; 172 173 elsif Is_Remote_Call_Interface (E) then 174 return Remote_Call_Interface; 175 176 else 177 return Normal; 178 end if; 179 end Get_Categorization; 180 181 Unit_Category : Categorization; 182 With_Category : Categorization; 183 184 -- Start of processing for Check_Categorization_Dependencies 185 186 begin 187 -- Intrinsic subprograms are preelaborated, so do not impose any 188 -- categorization dependencies. Also, ignore categorization 189 -- dependencies when compilation switch -gnatdu is used. 190 191 if Is_Intrinsic_Subprogram (Depended_Entity) or else Debug_Flag_U then 192 return; 193 end if; 194 195 -- First check 10.2.1 (11/1) rules on preelaborate packages 196 197 if Is_Preelaborated (Unit_Entity) 198 and then not Is_Preelaborated (Depended_Entity) 199 and then not Is_Pure (Depended_Entity) 200 then 201 Err := True; 202 else 203 Err := False; 204 end if; 205 206 -- Check categorization rules of RM E.2(5) 207 208 Unit_Category := Get_Categorization (Unit_Entity); 209 With_Category := Get_Categorization (Depended_Entity); 210 211 if With_Category > Unit_Category then 212 213 -- Special case: Remote_Types and Remote_Call_Interface are allowed 214 -- to WITH anything in the package body, per (RM E.2(5)). 215 216 if (Unit_Category = Remote_Types 217 or else Unit_Category = Remote_Call_Interface) 218 and then In_Package_Body (Unit_Entity) 219 then 220 null; 221 222 -- Special case: Remote_Types and Remote_Call_Interface declarations 223 -- can depend on a preelaborated unit via a private with_clause, per 224 -- AI05-0206. 225 226 elsif (Unit_Category = Remote_Types 227 or else 228 Unit_Category = Remote_Call_Interface) 229 and then Nkind (N) = N_With_Clause 230 and then Private_Present (N) 231 and then Is_Preelaborated (Depended_Entity) 232 then 233 null; 234 235 -- All other cases, we do have an error 236 237 else 238 Err := True; 239 end if; 240 end if; 241 242 -- Here if we have an error 243 244 if Err then 245 246 -- These messages are warnings in GNAT mode or if the -gnateP switch 247 -- was set. Otherwise these are real errors for real illegalities. 248 249 -- The reason we suppress these errors in GNAT mode is that the run- 250 -- time has several instances of violations of the categorization 251 -- errors (e.g. Pure units withing Preelaborate units. All these 252 -- violations are harmless in the cases where we intend them, and 253 -- we suppress the warnings with Warnings (Off). In cases where we 254 -- do not intend the violation, warnings are errors in GNAT mode 255 -- anyway, so we will still get an error. 256 257 Error_Msg_Warn := 258 Treat_Categorization_Errors_As_Warnings or GNAT_Mode; 259 260 -- Don't give error if main unit is not an internal unit, and the 261 -- unit generating the message is an internal unit. This is the 262 -- situation in which such messages would be ignored in any case, 263 -- so it is convenient not to generate them (since it causes 264 -- annoying interference with debugging). 265 266 if Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit)) 267 and then not Is_Internal_File_Name (Unit_File_Name (Main_Unit)) 268 then 269 return; 270 271 -- Dependence of Remote_Types or Remote_Call_Interface declaration 272 -- on a preelaborated unit with a normal with_clause. 273 274 elsif (Unit_Category = Remote_Types 275 or else 276 Unit_Category = Remote_Call_Interface) 277 and then Is_Preelaborated (Depended_Entity) 278 then 279 Error_Msg_NE 280 ("<<must use private with clause for preelaborated unit& ", 281 N, Depended_Entity); 282 283 -- Subunit case 284 285 elsif Is_Subunit then 286 Error_Msg_NE 287 ("<subunit cannot depend on& " & 288 "(parent has wrong categorization)", N, Depended_Entity); 289 290 -- Normal unit, not subunit 291 292 else 293 Error_Msg_NE 294 ("<<cannot depend on& " & 295 "(wrong categorization)", N, Depended_Entity); 296 end if; 297 298 -- Add further explanation for Pure/Preelaborate common cases 299 300 if Unit_Category = Pure then 301 Error_Msg_NE 302 ("\<<pure unit cannot depend on non-pure unit", 303 N, Depended_Entity); 304 305 elsif Is_Preelaborated (Unit_Entity) 306 and then not Is_Preelaborated (Depended_Entity) 307 and then not Is_Pure (Depended_Entity) 308 then 309 Error_Msg_NE 310 ("\<<preelaborated unit cannot depend on " 311 & "non-preelaborated unit", 312 N, Depended_Entity); 313 end if; 314 end if; 315 end Check_Categorization_Dependencies; 316 317 ----------------------------------- 318 -- Check_Non_Static_Default_Expr -- 319 ----------------------------------- 320 321 procedure Check_Non_Static_Default_Expr 322 (Type_Def : Node_Id; 323 Obj_Decl : Node_Id) 324 is 325 Recdef : Node_Id; 326 Component_Decl : Node_Id; 327 328 begin 329 if Nkind (Type_Def) = N_Derived_Type_Definition then 330 Recdef := Record_Extension_Part (Type_Def); 331 332 if No (Recdef) then 333 return; 334 end if; 335 336 else 337 Recdef := Type_Def; 338 end if; 339 340 -- Check that component declarations do not involve: 341 342 -- a. a non-static default expression, where the object is 343 -- declared to be default initialized. 344 345 -- b. a dynamic Itype (discriminants and constraints) 346 347 if Null_Present (Recdef) then 348 return; 349 else 350 Component_Decl := First (Component_Items (Component_List (Recdef))); 351 end if; 352 353 while Present (Component_Decl) 354 and then Nkind (Component_Decl) = N_Component_Declaration 355 loop 356 if Present (Expression (Component_Decl)) 357 and then Nkind (Expression (Component_Decl)) /= N_Null 358 and then not Is_OK_Static_Expression (Expression (Component_Decl)) 359 then 360 Error_Msg_Sloc := Sloc (Component_Decl); 361 Error_Msg_F 362 ("object in preelaborated unit has non-static default#", 363 Obj_Decl); 364 365 -- Fix this later ??? 366 367 -- elsif Has_Dynamic_Itype (Component_Decl) then 368 -- Error_Msg_N 369 -- ("dynamic type discriminant," & 370 -- " constraint in preelaborated unit", 371 -- Component_Decl); 372 end if; 373 374 Next (Component_Decl); 375 end loop; 376 end Check_Non_Static_Default_Expr; 377 378 --------------------------- 379 -- Has_Non_Remote_Access -- 380 --------------------------- 381 382 function Has_Non_Remote_Access (Typ : Entity_Id) return Boolean is 383 Component : Entity_Id; 384 Comp_Type : Entity_Id; 385 U_Typ : constant Entity_Id := Underlying_Type (Typ); 386 387 begin 388 if No (U_Typ) then 389 return False; 390 391 elsif Has_Read_Write_Attributes (Typ) 392 or else Has_Read_Write_Attributes (U_Typ) 393 then 394 return False; 395 396 elsif Is_Non_Remote_Access_Type (U_Typ) then 397 return True; 398 end if; 399 400 if Is_Record_Type (U_Typ) then 401 Component := First_Entity (U_Typ); 402 while Present (Component) loop 403 if not Is_Tag (Component) then 404 Comp_Type := Etype (Component); 405 406 if Has_Non_Remote_Access (Comp_Type) then 407 return True; 408 end if; 409 end if; 410 411 Next_Entity (Component); 412 end loop; 413 414 elsif Is_Array_Type (U_Typ) then 415 return Has_Non_Remote_Access (Component_Type (U_Typ)); 416 417 end if; 418 419 return False; 420 end Has_Non_Remote_Access; 421 422 ------------------------------- 423 -- Has_Read_Write_Attributes -- 424 ------------------------------- 425 426 function Has_Read_Write_Attributes (E : Entity_Id) return Boolean is 427 begin 428 return True 429 and then Has_Stream_Attribute_Definition 430 (E, TSS_Stream_Read, At_Any_Place => True) 431 and then Has_Stream_Attribute_Definition 432 (E, TSS_Stream_Write, At_Any_Place => True); 433 end Has_Read_Write_Attributes; 434 435 ------------------------------------- 436 -- Has_Stream_Attribute_Definition -- 437 ------------------------------------- 438 439 function Has_Stream_Attribute_Definition 440 (Typ : Entity_Id; 441 Nam : TSS_Name_Type; 442 At_Any_Place : Boolean := False) return Boolean 443 is 444 Rep_Item : Node_Id; 445 446 Real_Rep : Node_Id; 447 -- The stream operation may be specified by an attribute definition 448 -- clause in the source, or by an aspect that generates such an 449 -- attribute definition. For an aspect, the generated attribute 450 -- definition may be placed at the freeze point of the full view of 451 -- the type, but the aspect specification makes the operation visible 452 -- to a client wherever the partial view is visible. 453 454 begin 455 -- We start from the declaration node and then loop until the end of 456 -- the list until we find the requested attribute definition clause. 457 -- In Ada 2005 mode, clauses are ignored if they are not currently 458 -- visible (this is tested using the corresponding Entity, which is 459 -- inserted by the expander at the point where the clause occurs), 460 -- unless At_Any_Place is true. 461 462 Rep_Item := First_Rep_Item (Typ); 463 while Present (Rep_Item) loop 464 Real_Rep := Rep_Item; 465 466 -- If the representation item is an aspect specification, retrieve 467 -- the corresponding pragma or attribute definition. 468 469 if Nkind (Rep_Item) = N_Aspect_Specification then 470 Real_Rep := Aspect_Rep_Item (Rep_Item); 471 end if; 472 473 if Nkind (Real_Rep) = N_Attribute_Definition_Clause then 474 case Chars (Real_Rep) is 475 when Name_Read => 476 exit when Nam = TSS_Stream_Read; 477 478 when Name_Write => 479 exit when Nam = TSS_Stream_Write; 480 481 when Name_Input => 482 exit when Nam = TSS_Stream_Input; 483 484 when Name_Output => 485 exit when Nam = TSS_Stream_Output; 486 487 when others => 488 null; 489 490 end case; 491 end if; 492 493 Next_Rep_Item (Rep_Item); 494 end loop; 495 496 -- If not found, and the type is derived from a private view, check 497 -- for a stream attribute inherited from parent. Any specified stream 498 -- attributes will be attached to the derived type's underlying type 499 -- rather the derived type entity itself (which is itself private). 500 501 if No (Rep_Item) 502 and then Is_Private_Type (Typ) 503 and then Is_Derived_Type (Typ) 504 and then Present (Full_View (Typ)) 505 then 506 return Has_Stream_Attribute_Definition 507 (Underlying_Type (Typ), Nam, At_Any_Place); 508 509 -- Otherwise, if At_Any_Place is true, return True if the attribute is 510 -- available at any place; if it is false, return True only if the 511 -- attribute is currently visible. 512 513 else 514 return Present (Rep_Item) 515 and then (Ada_Version < Ada_2005 516 or else At_Any_Place 517 or else not Is_Hidden (Entity (Rep_Item))); 518 end if; 519 end Has_Stream_Attribute_Definition; 520 521 ---------------------------- 522 -- In_Package_Declaration -- 523 ---------------------------- 524 525 function In_Package_Declaration return Boolean is 526 Unit_Kind : constant Node_Kind := 527 Nkind (Unit (Cunit (Current_Sem_Unit))); 528 529 begin 530 -- There are no restrictions on the body of an RCI or RT unit 531 532 return Is_Package_Or_Generic_Package (Current_Scope) 533 and then Unit_Kind /= N_Package_Body 534 and then not In_Package_Body (Current_Scope) 535 and then not In_Instance; 536 end In_Package_Declaration; 537 538 --------------------------- 539 -- In_Preelaborated_Unit -- 540 --------------------------- 541 542 function In_Preelaborated_Unit return Boolean is 543 Unit_Entity : Entity_Id := Current_Scope; 544 Unit_Kind : constant Node_Kind := 545 Nkind (Unit (Cunit (Current_Sem_Unit))); 546 547 begin 548 -- If evaluating actuals for a child unit instantiation, then ignore 549 -- the preelaboration status of the parent; use the child instead. 550 551 if Is_Compilation_Unit (Unit_Entity) 552 and then Unit_Kind in N_Generic_Instantiation 553 and then not In_Same_Source_Unit (Unit_Entity, 554 Cunit (Current_Sem_Unit)) 555 then 556 Unit_Entity := Cunit_Entity (Current_Sem_Unit); 557 end if; 558 559 -- There are no constraints on the body of Remote_Call_Interface or 560 -- Remote_Types packages. 561 562 return (Unit_Entity /= Standard_Standard) 563 and then (Is_Preelaborated (Unit_Entity) 564 or else Is_Pure (Unit_Entity) 565 or else Is_Shared_Passive (Unit_Entity) 566 or else 567 ((Is_Remote_Types (Unit_Entity) 568 or else Is_Remote_Call_Interface (Unit_Entity)) 569 and then Ekind (Unit_Entity) = E_Package 570 and then Unit_Kind /= N_Package_Body 571 and then not In_Package_Body (Unit_Entity) 572 and then not In_Instance)); 573 end In_Preelaborated_Unit; 574 575 ------------------ 576 -- In_Pure_Unit -- 577 ------------------ 578 579 function In_Pure_Unit return Boolean is 580 begin 581 return Is_Pure (Current_Scope); 582 end In_Pure_Unit; 583 584 ------------------------ 585 -- In_RCI_Declaration -- 586 ------------------------ 587 588 function In_RCI_Declaration return Boolean is 589 begin 590 return Is_Remote_Call_Interface (Current_Scope) 591 and then In_Package_Declaration; 592 end In_RCI_Declaration; 593 594 ----------------------- 595 -- In_RT_Declaration -- 596 ----------------------- 597 598 function In_RT_Declaration return Boolean is 599 begin 600 return Is_Remote_Types (Current_Scope) and then In_Package_Declaration; 601 end In_RT_Declaration; 602 603 ---------------------------- 604 -- In_Shared_Passive_Unit -- 605 ---------------------------- 606 607 function In_Shared_Passive_Unit return Boolean is 608 Unit_Entity : constant Entity_Id := Current_Scope; 609 610 begin 611 return Is_Shared_Passive (Unit_Entity); 612 end In_Shared_Passive_Unit; 613 614 --------------------------------------- 615 -- In_Subprogram_Task_Protected_Unit -- 616 --------------------------------------- 617 618 function In_Subprogram_Task_Protected_Unit return Boolean is 619 E : Entity_Id; 620 621 begin 622 -- The following is to verify that a declaration is inside 623 -- subprogram, generic subprogram, task unit, protected unit. 624 -- Used to validate if a lib. unit is Pure. RM 10.2.1(16). 625 626 -- Use scope chain to check successively outer scopes 627 628 E := Current_Scope; 629 loop 630 if Is_Subprogram_Or_Generic_Subprogram (E) 631 or else 632 Is_Concurrent_Type (E) 633 then 634 return True; 635 636 elsif E = Standard_Standard then 637 return False; 638 end if; 639 640 E := Scope (E); 641 end loop; 642 end In_Subprogram_Task_Protected_Unit; 643 644 ------------------------------- 645 -- Is_Non_Remote_Access_Type -- 646 ------------------------------- 647 648 function Is_Non_Remote_Access_Type (E : Entity_Id) return Boolean is 649 U_E : constant Entity_Id := Underlying_Type (Base_Type (E)); 650 -- Use full view of base type to handle subtypes properly. 651 652 begin 653 if No (U_E) then 654 655 -- This case arises for the case of a generic formal type, in which 656 -- case E.2.2(8) rules will be enforced at instantiation time. 657 658 return False; 659 end if; 660 661 return Is_Access_Type (U_E) 662 and then not Is_Remote_Access_To_Class_Wide_Type (U_E) 663 and then not Is_Remote_Access_To_Subprogram_Type (U_E); 664 end Is_Non_Remote_Access_Type; 665 666 --------------------------- 667 -- No_External_Streaming -- 668 --------------------------- 669 670 function No_External_Streaming (E : Entity_Id) return Boolean is 671 U_E : constant Entity_Id := Underlying_Type (E); 672 673 begin 674 if No (U_E) then 675 return False; 676 677 elsif Has_Read_Write_Attributes (E) then 678 679 -- Note: availability of stream attributes is tested on E, not U_E. 680 -- There may be stream attributes defined on U_E that are not visible 681 -- at the place where support of external streaming is tested. 682 683 return False; 684 685 elsif Has_Non_Remote_Access (U_E) then 686 return True; 687 end if; 688 689 return Is_Limited_Type (E); 690 end No_External_Streaming; 691 692 ------------------------------------- 693 -- Set_Categorization_From_Pragmas -- 694 ------------------------------------- 695 696 procedure Set_Categorization_From_Pragmas (N : Node_Id) is 697 P : constant Node_Id := Parent (N); 698 S : constant Entity_Id := Current_Scope; 699 700 procedure Set_Parents (Visibility : Boolean); 701 -- If this is a child instance, the parents are not immediately 702 -- visible during analysis. Make them momentarily visible so that 703 -- the argument of the pragma can be resolved properly, and reset 704 -- afterwards. 705 706 ----------------- 707 -- Set_Parents -- 708 ----------------- 709 710 procedure Set_Parents (Visibility : Boolean) is 711 Par : Entity_Id; 712 begin 713 Par := Scope (S); 714 while Present (Par) and then Par /= Standard_Standard loop 715 Set_Is_Immediately_Visible (Par, Visibility); 716 Par := Scope (Par); 717 end loop; 718 end Set_Parents; 719 720 -- Start of processing for Set_Categorization_From_Pragmas 721 722 begin 723 -- Deal with categorization pragmas in Pragmas of Compilation_Unit. 724 -- The purpose is to set categorization flags before analyzing the 725 -- unit itself, so as to diagnose violations of categorization as 726 -- we process each declaration, even though the pragma appears after 727 -- the unit. 728 729 if Nkind (P) /= N_Compilation_Unit then 730 return; 731 end if; 732 733 declare 734 PN : Node_Id; 735 736 begin 737 if Is_Child_Unit (S) and then Is_Generic_Instance (S) then 738 Set_Parents (True); 739 end if; 740 741 PN := First (Pragmas_After (Aux_Decls_Node (P))); 742 while Present (PN) loop 743 744 -- Skip implicit types that may have been introduced by 745 -- previous analysis. 746 747 if Nkind (PN) = N_Pragma then 748 case Get_Pragma_Id (PN) is 749 when Pragma_All_Calls_Remote | 750 Pragma_Preelaborate | 751 Pragma_Pure | 752 Pragma_Remote_Call_Interface | 753 Pragma_Remote_Types | 754 Pragma_Shared_Passive => Analyze (PN); 755 when others => null; 756 end case; 757 end if; 758 759 Next (PN); 760 end loop; 761 762 if Is_Child_Unit (S) and then Is_Generic_Instance (S) then 763 Set_Parents (False); 764 end if; 765 end; 766 end Set_Categorization_From_Pragmas; 767 768 ----------------------------------- 769 -- Set_Categorization_From_Scope -- 770 ----------------------------------- 771 772 procedure Set_Categorization_From_Scope (E : Entity_Id; Scop : Entity_Id) is 773 Declaration : Node_Id := Empty; 774 Specification : Node_Id := Empty; 775 776 begin 777 Set_Is_Pure 778 (E, Is_Pure (Scop) and then Is_Library_Level_Entity (E)); 779 780 if not Is_Remote_Call_Interface (E) then 781 if Ekind (E) in Subprogram_Kind then 782 Declaration := Unit_Declaration_Node (E); 783 784 if Nkind_In (Declaration, N_Subprogram_Body, 785 N_Subprogram_Renaming_Declaration) 786 then 787 Specification := Corresponding_Spec (Declaration); 788 end if; 789 end if; 790 791 -- A subprogram body or renaming-as-body is a remote call interface 792 -- if it serves as the completion of a subprogram declaration that 793 -- is a remote call interface. 794 795 if Nkind (Specification) in N_Entity then 796 Set_Is_Remote_Call_Interface 797 (E, Is_Remote_Call_Interface (Specification)); 798 799 -- A subprogram declaration is a remote call interface when it is 800 -- declared within the visible part of, or declared by, a library 801 -- unit declaration that is a remote call interface. 802 803 else 804 Set_Is_Remote_Call_Interface 805 (E, Is_Remote_Call_Interface (Scop) 806 and then not (In_Private_Part (Scop) 807 or else In_Package_Body (Scop))); 808 end if; 809 end if; 810 811 Set_Is_Remote_Types 812 (E, Is_Remote_Types (Scop) 813 and then not (In_Private_Part (Scop) 814 or else In_Package_Body (Scop))); 815 end Set_Categorization_From_Scope; 816 817 ------------------------------ 818 -- Static_Discriminant_Expr -- 819 ------------------------------ 820 821 -- We need to accommodate a Why_Not_Static call somehow here ??? 822 823 function Static_Discriminant_Expr (L : List_Id) return Boolean is 824 Discriminant_Spec : Node_Id; 825 826 begin 827 Discriminant_Spec := First (L); 828 while Present (Discriminant_Spec) loop 829 if Present (Expression (Discriminant_Spec)) 830 and then 831 not Is_OK_Static_Expression (Expression (Discriminant_Spec)) 832 then 833 return False; 834 end if; 835 836 Next (Discriminant_Spec); 837 end loop; 838 839 return True; 840 end Static_Discriminant_Expr; 841 842 -------------------------------------- 843 -- Validate_Access_Type_Declaration -- 844 -------------------------------------- 845 846 procedure Validate_Access_Type_Declaration (T : Entity_Id; N : Node_Id) is 847 Def : constant Node_Id := Type_Definition (N); 848 849 begin 850 case Nkind (Def) is 851 852 -- Access to subprogram case 853 854 when N_Access_To_Subprogram_Definition => 855 856 -- A pure library_item must not contain the declaration of a 857 -- named access type, except within a subprogram, generic 858 -- subprogram, task unit, or protected unit (RM 10.2.1(16)). 859 860 -- This test is skipped in Ada 2005 (see AI-366) 861 862 if Ada_Version < Ada_2005 863 and then Comes_From_Source (T) 864 and then In_Pure_Unit 865 and then not In_Subprogram_Task_Protected_Unit 866 then 867 Error_Msg_N ("named access type not allowed in pure unit", T); 868 end if; 869 870 -- Access to object case 871 872 when N_Access_To_Object_Definition => 873 if Comes_From_Source (T) 874 and then In_Pure_Unit 875 and then not In_Subprogram_Task_Protected_Unit 876 then 877 -- We can't give the message yet, since the type is not frozen 878 -- and in Ada 2005 mode, access types are allowed in pure units 879 -- if the type has no storage pool (see AI-366). So we set a 880 -- flag which will be checked at freeze time. 881 882 Set_Is_Pure_Unit_Access_Type (T); 883 end if; 884 885 -- Check for RCI or RT unit type declaration: declaration of an 886 -- access-to-object type is illegal unless it is a general access 887 -- type that designates a class-wide limited private type. 888 -- Note that constraints on the primitive subprograms of the 889 -- designated tagged type are not enforced here but in 890 -- Validate_RACW_Primitives, which is done separately because the 891 -- designated type might not be frozen (and therefore its 892 -- primitive operations might not be completely known) at the 893 -- point of the RACW declaration. 894 895 Validate_Remote_Access_Object_Type_Declaration (T); 896 897 -- Check for shared passive unit type declaration. It should 898 -- not contain the declaration of access to class wide type, 899 -- access to task type and access to protected type with entry. 900 901 Validate_SP_Access_Object_Type_Decl (T); 902 903 when others => 904 null; 905 end case; 906 907 -- Set categorization flag from package on entity as well, to allow 908 -- easy checks later on for required validations of RCI or RT units. 909 -- This is only done for entities that are in the original source. 910 911 if Comes_From_Source (T) 912 and then not (In_Package_Body (Scope (T)) 913 or else In_Private_Part (Scope (T))) 914 then 915 Set_Is_Remote_Call_Interface 916 (T, Is_Remote_Call_Interface (Scope (T))); 917 Set_Is_Remote_Types 918 (T, Is_Remote_Types (Scope (T))); 919 end if; 920 end Validate_Access_Type_Declaration; 921 922 ---------------------------- 923 -- Validate_Ancestor_Part -- 924 ---------------------------- 925 926 procedure Validate_Ancestor_Part (N : Node_Id) is 927 A : constant Node_Id := Ancestor_Part (N); 928 T : constant Entity_Id := Entity (A); 929 930 begin 931 if In_Preelaborated_Unit 932 and then not In_Subprogram_Or_Concurrent_Unit 933 and then (not Inside_A_Generic 934 or else Present (Enclosing_Generic_Body (N))) 935 then 936 -- If the type is private, it must have the Ada 2005 pragma 937 -- Has_Preelaborable_Initialization. 938 939 -- The check is omitted within predefined units. This is probably 940 -- obsolete code to fix the Ada 95 weakness in this area ??? 941 942 if Is_Private_Type (T) 943 and then not Has_Pragma_Preelab_Init (T) 944 and then not Is_Internal_File_Name 945 (Unit_File_Name (Get_Source_Unit (N))) 946 then 947 Error_Msg_N 948 ("private ancestor type not allowed in preelaborated unit", A); 949 950 elsif Is_Record_Type (T) then 951 if Nkind (Parent (T)) = N_Full_Type_Declaration then 952 Check_Non_Static_Default_Expr 953 (Type_Definition (Parent (T)), A); 954 end if; 955 end if; 956 end if; 957 end Validate_Ancestor_Part; 958 959 ---------------------------------------- 960 -- Validate_Categorization_Dependency -- 961 ---------------------------------------- 962 963 procedure Validate_Categorization_Dependency 964 (N : Node_Id; 965 E : Entity_Id) 966 is 967 K : constant Node_Kind := Nkind (N); 968 P : Node_Id := Parent (N); 969 U : Entity_Id := E; 970 Is_Subunit : constant Boolean := Nkind (P) = N_Subunit; 971 972 begin 973 -- Only validate library units and subunits. For subunits, checks 974 -- concerning withed units apply to the parent compilation unit. 975 976 if Is_Subunit then 977 P := Parent (P); 978 U := Scope (E); 979 980 while Present (U) 981 and then not Is_Compilation_Unit (U) 982 and then not Is_Child_Unit (U) 983 loop 984 U := Scope (U); 985 end loop; 986 end if; 987 988 if Nkind (P) /= N_Compilation_Unit then 989 return; 990 end if; 991 992 -- Body of RCI unit does not need validation 993 994 if Is_Remote_Call_Interface (E) 995 and then Nkind_In (N, N_Package_Body, N_Subprogram_Body) 996 then 997 return; 998 end if; 999 1000 -- Ada 2005 (AI-50217): Process explicit non-limited with_clauses 1001 1002 declare 1003 Item : Node_Id; 1004 Entity_Of_Withed : Entity_Id; 1005 1006 begin 1007 Item := First (Context_Items (P)); 1008 while Present (Item) loop 1009 if Nkind (Item) = N_With_Clause 1010 and then not (Implicit_With (Item) 1011 or else Limited_Present (Item) 1012 1013 -- Skip if error already posted on the WITH 1014 -- clause (in which case the Name attribute 1015 -- may be invalid). In particular, this fixes 1016 -- the problem of hanging in the presence of a 1017 -- WITH clause on a child that is an illegal 1018 -- generic instantiation. 1019 1020 or else Error_Posted (Item)) 1021 then 1022 Entity_Of_Withed := Entity (Name (Item)); 1023 Check_Categorization_Dependencies 1024 (U, Entity_Of_Withed, Item, Is_Subunit); 1025 end if; 1026 1027 Next (Item); 1028 end loop; 1029 end; 1030 1031 -- Child depends on parent; therefore parent should also be categorized 1032 -- and satisfy the dependency hierarchy. 1033 1034 -- Check if N is a child spec 1035 1036 if (K in N_Generic_Declaration or else 1037 K in N_Generic_Instantiation or else 1038 K in N_Generic_Renaming_Declaration or else 1039 K = N_Package_Declaration or else 1040 K = N_Package_Renaming_Declaration or else 1041 K = N_Subprogram_Declaration or else 1042 K = N_Subprogram_Renaming_Declaration) 1043 and then Present (Parent_Spec (N)) 1044 then 1045 Check_Categorization_Dependencies (E, Scope (E), N, False); 1046 1047 -- Verify that public child of an RCI library unit must also be an 1048 -- RCI library unit (RM E.2.3(15)). 1049 1050 if Is_Remote_Call_Interface (Scope (E)) 1051 and then not Private_Present (P) 1052 and then not Is_Remote_Call_Interface (E) 1053 then 1054 Error_Msg_N ("public child of rci unit must also be rci unit", N); 1055 end if; 1056 end if; 1057 end Validate_Categorization_Dependency; 1058 1059 -------------------------------- 1060 -- Validate_Controlled_Object -- 1061 -------------------------------- 1062 1063 procedure Validate_Controlled_Object (E : Entity_Id) is 1064 begin 1065 -- Don't need this check in Ada 2005 mode, where this is all taken 1066 -- care of by the mechanism for Preelaborable Initialization. 1067 1068 if Ada_Version >= Ada_2005 then 1069 return; 1070 end if; 1071 1072 -- For now, never apply this check for internal GNAT units, since we 1073 -- have a number of cases in the library where we are stuck with objects 1074 -- of this type, and the RM requires Preelaborate. 1075 1076 -- For similar reasons, we only do this check for source entities, since 1077 -- we generate entities of this type in some situations. 1078 1079 -- Note that the 10.2.1(9) restrictions are not relevant to us anyway. 1080 -- We have to enforce them for RM compatibility, but we have no trouble 1081 -- accepting these objects and doing the right thing. Note that there is 1082 -- no requirement that Preelaborate not actually generate any code. 1083 1084 if In_Preelaborated_Unit 1085 and then not Debug_Flag_PP 1086 and then Comes_From_Source (E) 1087 and then not 1088 Is_Internal_File_Name (Unit_File_Name (Get_Source_Unit (E))) 1089 and then (not Inside_A_Generic 1090 or else Present (Enclosing_Generic_Body (E))) 1091 and then not Is_Protected_Type (Etype (E)) 1092 then 1093 Error_Msg_N 1094 ("library level controlled object not allowed in " & 1095 "preelaborated unit", E); 1096 end if; 1097 end Validate_Controlled_Object; 1098 1099 -------------------------------------- 1100 -- Validate_Null_Statement_Sequence -- 1101 -------------------------------------- 1102 1103 procedure Validate_Null_Statement_Sequence (N : Node_Id) is 1104 Item : Node_Id; 1105 1106 begin 1107 if In_Preelaborated_Unit then 1108 Item := First (Statements (Handled_Statement_Sequence (N))); 1109 while Present (Item) loop 1110 if Nkind (Item) /= N_Label 1111 and then Nkind (Item) /= N_Null_Statement 1112 then 1113 -- In GNAT mode, this is a warning, allowing the run-time 1114 -- to judiciously bypass this error condition. 1115 1116 Error_Msg_Warn := GNAT_Mode; 1117 Error_Msg_N 1118 ("<<statements not allowed in preelaborated unit", Item); 1119 1120 exit; 1121 end if; 1122 1123 Next (Item); 1124 end loop; 1125 end if; 1126 end Validate_Null_Statement_Sequence; 1127 1128 --------------------------------- 1129 -- Validate_Object_Declaration -- 1130 --------------------------------- 1131 1132 procedure Validate_Object_Declaration (N : Node_Id) is 1133 Id : constant Entity_Id := Defining_Identifier (N); 1134 E : constant Node_Id := Expression (N); 1135 Odf : constant Node_Id := Object_Definition (N); 1136 T : constant Entity_Id := Etype (Id); 1137 1138 begin 1139 -- Verify that any access to subprogram object does not have in its 1140 -- subprogram profile access type parameters or limited parameters 1141 -- without Read and Write attributes (E.2.3(13)). 1142 1143 Validate_RCI_Subprogram_Declaration (N); 1144 1145 -- Check that if we are in preelaborated elaboration code, then we 1146 -- do not have an instance of a default initialized private, task or 1147 -- protected object declaration which would violate (RM 10.2.1(9)). 1148 -- Note that constants are never default initialized (and the test 1149 -- below also filters out deferred constants). A variable is default 1150 -- initialized if it does *not* have an initialization expression. 1151 1152 -- Filter out cases that are not declaration of a variable from source 1153 1154 if Nkind (N) /= N_Object_Declaration 1155 or else Constant_Present (N) 1156 or else not Comes_From_Source (Id) 1157 then 1158 return; 1159 end if; 1160 1161 -- Exclude generic specs from the checks (this will get rechecked 1162 -- on instantiations). 1163 1164 if Inside_A_Generic and then No (Enclosing_Generic_Body (Id)) then 1165 return; 1166 end if; 1167 1168 -- Required checks for declaration that is in a preelaborated package 1169 -- and is not within some subprogram. 1170 1171 if In_Preelaborated_Unit 1172 and then not In_Subprogram_Or_Concurrent_Unit 1173 then 1174 -- Check for default initialized variable case. Note that in 1175 -- accordance with (RM B.1(24)) imported objects are not subject to 1176 -- default initialization. 1177 -- If the initialization does not come from source and is an 1178 -- aggregate, it is a static initialization that replaces an 1179 -- implicit call, and must be treated as such. 1180 1181 if Present (E) 1182 and then (Comes_From_Source (E) or else Nkind (E) /= N_Aggregate) 1183 then 1184 null; 1185 1186 elsif Is_Imported (Id) then 1187 null; 1188 1189 else 1190 declare 1191 Ent : Entity_Id := T; 1192 1193 begin 1194 -- An array whose component type is a record with nonstatic 1195 -- default expressions is a violation, so we get the array's 1196 -- component type. 1197 1198 if Is_Array_Type (Ent) then 1199 declare 1200 Comp_Type : Entity_Id; 1201 1202 begin 1203 Comp_Type := Component_Type (Ent); 1204 while Is_Array_Type (Comp_Type) loop 1205 Comp_Type := Component_Type (Comp_Type); 1206 end loop; 1207 1208 Ent := Comp_Type; 1209 end; 1210 end if; 1211 1212 -- Object decl. that is of record type and has no default expr. 1213 -- should check if there is any non-static default expression 1214 -- in component decl. of the record type decl. 1215 1216 if Is_Record_Type (Ent) then 1217 if Nkind (Parent (Ent)) = N_Full_Type_Declaration then 1218 Check_Non_Static_Default_Expr 1219 (Type_Definition (Parent (Ent)), N); 1220 1221 elsif Nkind (Odf) = N_Subtype_Indication 1222 and then not Is_Array_Type (T) 1223 and then not Is_Private_Type (T) 1224 then 1225 Check_Non_Static_Default_Expr (Type_Definition 1226 (Parent (Entity (Subtype_Mark (Odf)))), N); 1227 end if; 1228 end if; 1229 1230 -- Check for invalid use of private object. Note that Ada 2005 1231 -- AI-161 modifies the rules for Ada 2005, including the use of 1232 -- the new pragma Preelaborable_Initialization. 1233 1234 if Is_Private_Type (Ent) 1235 or else Depends_On_Private (Ent) 1236 then 1237 -- Case where type has preelaborable initialization which 1238 -- means that a pragma Preelaborable_Initialization was 1239 -- given for the private type. 1240 1241 if Relaxed_RM_Semantics then 1242 1243 -- In relaxed mode, do not issue these messages, this 1244 -- is basically similar to the GNAT_Mode test below. 1245 1246 null; 1247 1248 elsif Has_Preelaborable_Initialization (Ent) then 1249 1250 -- But for the predefined units, we will ignore this 1251 -- status unless we are in Ada 2005 mode since we want 1252 -- Ada 95 compatible behavior, in which the entities 1253 -- marked with this pragma in the predefined library are 1254 -- not treated specially. 1255 1256 if Ada_Version < Ada_2005 then 1257 Error_Msg_N 1258 ("private object not allowed in preelaborated unit", 1259 N); 1260 Error_Msg_N ("\(would be legal in Ada 2005 mode)", N); 1261 end if; 1262 1263 -- Type does not have preelaborable initialization 1264 1265 else 1266 -- We allow this when compiling in GNAT mode to make life 1267 -- easier for some cases where it would otherwise be hard 1268 -- to be exactly valid Ada. 1269 1270 if not GNAT_Mode then 1271 Error_Msg_N 1272 ("private object not allowed in preelaborated unit", 1273 N); 1274 1275 -- Add a message if it would help to provide a pragma 1276 -- Preelaborable_Initialization on the type of the 1277 -- object (which would make it legal in Ada 2005). 1278 1279 -- If the type has no full view (generic type, or 1280 -- previous error), the warning does not apply. 1281 1282 if Is_Private_Type (Ent) 1283 and then Present (Full_View (Ent)) 1284 and then 1285 Has_Preelaborable_Initialization (Full_View (Ent)) 1286 then 1287 Error_Msg_Sloc := Sloc (Ent); 1288 1289 if Ada_Version >= Ada_2005 then 1290 Error_Msg_NE 1291 ("\would be legal if pragma Preelaborable_" & 1292 "Initialization given for & #", N, Ent); 1293 else 1294 Error_Msg_NE 1295 ("\would be legal in Ada 2005 if pragma " & 1296 "Preelaborable_Initialization given for & #", 1297 N, Ent); 1298 end if; 1299 end if; 1300 end if; 1301 end if; 1302 1303 -- Access to Task or Protected type 1304 1305 elsif Is_Entity_Name (Odf) 1306 and then Present (Etype (Odf)) 1307 and then Is_Access_Type (Etype (Odf)) 1308 then 1309 Ent := Designated_Type (Etype (Odf)); 1310 1311 elsif Is_Entity_Name (Odf) then 1312 Ent := Entity (Odf); 1313 1314 elsif Nkind (Odf) = N_Subtype_Indication then 1315 Ent := Etype (Subtype_Mark (Odf)); 1316 1317 elsif Nkind (Odf) = N_Constrained_Array_Definition then 1318 Ent := Component_Type (T); 1319 end if; 1320 1321 if Is_Task_Type (Ent) 1322 or else (Is_Protected_Type (Ent) and then Has_Entries (Ent)) 1323 then 1324 Error_Msg_N 1325 ("concurrent object not allowed in preelaborated unit", 1326 N); 1327 return; 1328 end if; 1329 end; 1330 end if; 1331 1332 -- Non-static discriminants not allowed in preelaborated unit. 1333 -- Objects of a controlled type with a user-defined Initialize 1334 -- are forbidden as well. 1335 1336 if Is_Record_Type (Etype (Id)) then 1337 declare 1338 ET : constant Entity_Id := Etype (Id); 1339 EE : constant Entity_Id := Etype (Etype (Id)); 1340 PEE : Node_Id; 1341 1342 begin 1343 if Has_Discriminants (ET) and then Present (EE) then 1344 PEE := Parent (EE); 1345 1346 if Nkind (PEE) = N_Full_Type_Declaration 1347 and then not Static_Discriminant_Expr 1348 (Discriminant_Specifications (PEE)) 1349 then 1350 Error_Msg_N 1351 ("non-static discriminant in preelaborated unit", 1352 PEE); 1353 end if; 1354 end if; 1355 1356 -- For controlled type or type with controlled component, check 1357 -- preelaboration flag, as there may be a non-null Initialize 1358 -- primitive. For language versions earlier than Ada 2005, 1359 -- there is no notion of preelaborable initialization, and 1360 -- Validate_Controlled_Object is used to enforce rules for 1361 -- controlled objects. 1362 1363 if (Is_Controlled (ET) or else Has_Controlled_Component (ET)) 1364 and then Ada_Version >= Ada_2005 1365 and then not Has_Preelaborable_Initialization (ET) 1366 then 1367 Error_Msg_NE 1368 ("controlled type& does not have" 1369 & " preelaborable initialization", N, ET); 1370 end if; 1371 end; 1372 1373 end if; 1374 end if; 1375 1376 -- A pure library_item must not contain the declaration of any variable 1377 -- except within a subprogram, generic subprogram, task unit, or 1378 -- protected unit (RM 10.2.1(16)). 1379 1380 if In_Pure_Unit and then not In_Subprogram_Task_Protected_Unit then 1381 Error_Msg_N ("declaration of variable not allowed in pure unit", N); 1382 1383 elsif not In_Private_Part (Id) then 1384 1385 -- The visible part of an RCI library unit must not contain the 1386 -- declaration of a variable (RM E.1.3(9)). 1387 1388 if In_RCI_Declaration then 1389 Error_Msg_N ("visible variable not allowed in 'R'C'I unit", N); 1390 1391 -- The visible part of a Shared Passive library unit must not contain 1392 -- the declaration of a variable (RM E.2.2(7)). 1393 1394 elsif In_RT_Declaration then 1395 Error_Msg_N 1396 ("visible variable not allowed in remote types unit", N); 1397 end if; 1398 end if; 1399 end Validate_Object_Declaration; 1400 1401 ----------------------------- 1402 -- Validate_RACW_Primitive -- 1403 ----------------------------- 1404 1405 procedure Validate_RACW_Primitive 1406 (Subp : Entity_Id; 1407 RACW : Entity_Id) 1408 is 1409 procedure Illegal_Remote_Subp (Msg : String; N : Node_Id); 1410 -- Diagnose illegality on N. If RACW is present, report the error on it 1411 -- rather than on N. 1412 1413 ------------------------- 1414 -- Illegal_Remote_Subp -- 1415 ------------------------- 1416 1417 procedure Illegal_Remote_Subp (Msg : String; N : Node_Id) is 1418 begin 1419 if Present (RACW) then 1420 if not Error_Posted (RACW) then 1421 Error_Msg_N 1422 ("illegal remote access to class-wide type&", RACW); 1423 end if; 1424 1425 Error_Msg_Sloc := Sloc (N); 1426 Error_Msg_NE ("\\" & Msg & " in primitive& #", RACW, Subp); 1427 1428 else 1429 Error_Msg_NE (Msg & " in remote subprogram&", N, Subp); 1430 end if; 1431 end Illegal_Remote_Subp; 1432 1433 Rtyp : Entity_Id; 1434 Param : Node_Id; 1435 Param_Spec : Node_Id; 1436 Param_Type : Entity_Id; 1437 1438 -- Start of processing for Validate_RACW_Primitive 1439 1440 begin 1441 -- Check return type 1442 1443 if Ekind (Subp) = E_Function then 1444 Rtyp := Etype (Subp); 1445 1446 -- AI05-0101 (Binding Interpretation): The result type of a remote 1447 -- function must either support external streaming or be a 1448 -- controlling access result type. 1449 1450 if Has_Controlling_Result (Subp) then 1451 null; 1452 1453 elsif Ekind (Rtyp) = E_Anonymous_Access_Type then 1454 Illegal_Remote_Subp ("anonymous access result", Rtyp); 1455 1456 elsif Is_Limited_Type (Rtyp) then 1457 if No (TSS (Rtyp, TSS_Stream_Read)) 1458 or else 1459 No (TSS (Rtyp, TSS_Stream_Write)) 1460 then 1461 Illegal_Remote_Subp 1462 ("limited return type must have Read and Write attributes", 1463 Parent (Subp)); 1464 Explain_Limited_Type (Rtyp, Parent (Subp)); 1465 end if; 1466 1467 -- Check that the return type supports external streaming 1468 1469 elsif No_External_Streaming (Rtyp) 1470 and then not Error_Posted (Rtyp) 1471 then 1472 Illegal_Remote_Subp ("return type containing non-remote access " 1473 & "must have Read and Write attributes", 1474 Parent (Subp)); 1475 end if; 1476 end if; 1477 1478 Param := First_Formal (Subp); 1479 while Present (Param) loop 1480 1481 -- Now find out if this parameter is a controlling parameter 1482 1483 Param_Spec := Parent (Param); 1484 Param_Type := Etype (Param); 1485 1486 if Is_Controlling_Formal (Param) then 1487 1488 -- It is a controlling parameter, so specific checks below do not 1489 -- apply. 1490 1491 null; 1492 1493 elsif Ekind_In (Param_Type, E_Anonymous_Access_Type, 1494 E_Anonymous_Access_Subprogram_Type) 1495 then 1496 -- From RM E.2.2(14), no anonymous access parameter other than 1497 -- controlling ones may be used (because an anonymous access 1498 -- type never supports external streaming). 1499 1500 Illegal_Remote_Subp 1501 ("non-controlling access parameter", Param_Spec); 1502 1503 elsif No_External_Streaming (Param_Type) 1504 and then not Error_Posted (Param_Type) 1505 then 1506 Illegal_Remote_Subp ("formal parameter in remote subprogram must " 1507 & "support external streaming", Param_Spec); 1508 end if; 1509 1510 -- Check next parameter in this subprogram 1511 1512 Next_Formal (Param); 1513 end loop; 1514 end Validate_RACW_Primitive; 1515 1516 ------------------------------ 1517 -- Validate_RACW_Primitives -- 1518 ------------------------------ 1519 1520 procedure Validate_RACW_Primitives (T : Entity_Id) is 1521 Desig_Type : Entity_Id; 1522 Primitive_Subprograms : Elist_Id; 1523 Subprogram_Elmt : Elmt_Id; 1524 Subprogram : Entity_Id; 1525 1526 begin 1527 Desig_Type := Etype (Designated_Type (T)); 1528 1529 -- No action needed for concurrent types 1530 1531 if Is_Concurrent_Type (Desig_Type) then 1532 return; 1533 end if; 1534 1535 Primitive_Subprograms := Primitive_Operations (Desig_Type); 1536 1537 Subprogram_Elmt := First_Elmt (Primitive_Subprograms); 1538 while Subprogram_Elmt /= No_Elmt loop 1539 Subprogram := Node (Subprogram_Elmt); 1540 1541 if Is_Predefined_Dispatching_Operation (Subprogram) 1542 or else Is_Hidden (Subprogram) 1543 then 1544 goto Next_Subprogram; 1545 end if; 1546 1547 Validate_RACW_Primitive (Subp => Subprogram, RACW => T); 1548 1549 <<Next_Subprogram>> 1550 Next_Elmt (Subprogram_Elmt); 1551 end loop; 1552 end Validate_RACW_Primitives; 1553 1554 ------------------------------- 1555 -- Validate_RCI_Declarations -- 1556 ------------------------------- 1557 1558 procedure Validate_RCI_Declarations (P : Entity_Id) is 1559 E : Entity_Id; 1560 1561 begin 1562 E := First_Entity (P); 1563 while Present (E) loop 1564 if Comes_From_Source (E) then 1565 if Is_Limited_Type (E) then 1566 Error_Msg_N 1567 ("limited type not allowed in rci unit", Parent (E)); 1568 Explain_Limited_Type (E, Parent (E)); 1569 1570 elsif Ekind_In (E, E_Generic_Function, 1571 E_Generic_Package, 1572 E_Generic_Procedure) 1573 then 1574 Error_Msg_N ("generic declaration not allowed in rci unit", 1575 Parent (E)); 1576 1577 elsif (Ekind (E) = E_Function or else Ekind (E) = E_Procedure) 1578 and then Has_Pragma_Inline (E) 1579 then 1580 Error_Msg_N 1581 ("inlined subprogram not allowed in rci unit", Parent (E)); 1582 1583 -- Inner packages that are renamings need not be checked. Generic 1584 -- RCI packages are subject to the checks, but entities that come 1585 -- from formal packages are not part of the visible declarations 1586 -- of the package and are not checked. 1587 1588 elsif Ekind (E) = E_Package then 1589 if Present (Renamed_Entity (E)) then 1590 null; 1591 1592 elsif Ekind (P) /= E_Generic_Package 1593 or else List_Containing (Unit_Declaration_Node (E)) /= 1594 Generic_Formal_Declarations 1595 (Unit_Declaration_Node (P)) 1596 then 1597 Validate_RCI_Declarations (E); 1598 end if; 1599 end if; 1600 end if; 1601 1602 Next_Entity (E); 1603 end loop; 1604 end Validate_RCI_Declarations; 1605 1606 ----------------------------------------- 1607 -- Validate_RCI_Subprogram_Declaration -- 1608 ----------------------------------------- 1609 1610 procedure Validate_RCI_Subprogram_Declaration (N : Node_Id) is 1611 K : constant Node_Kind := Nkind (N); 1612 Profile : List_Id; 1613 Id : constant Entity_Id := Defining_Entity (N); 1614 Param_Spec : Node_Id; 1615 Param_Type : Entity_Id; 1616 Error_Node : Node_Id := N; 1617 1618 begin 1619 -- This procedure enforces rules on subprogram and access to subprogram 1620 -- declarations in RCI units. These rules do not apply to expander 1621 -- generated routines, which are not remote subprograms. It is called: 1622 1623 -- 1. from Analyze_Subprogram_Declaration. 1624 -- 2. from Validate_Object_Declaration (access to subprogram). 1625 1626 if not (Comes_From_Source (N) 1627 and then In_RCI_Declaration 1628 and then not In_Private_Part (Scope (Id))) 1629 then 1630 return; 1631 end if; 1632 1633 if K = N_Subprogram_Declaration then 1634 Profile := Parameter_Specifications (Specification (N)); 1635 1636 else 1637 pragma Assert (K = N_Object_Declaration); 1638 1639 -- The above assertion is dubious, the visible declarations of an 1640 -- RCI unit never contain an object declaration, this should be an 1641 -- ACCESS-to-object declaration??? 1642 1643 if Nkind (Id) = N_Defining_Identifier 1644 and then Nkind (Parent (Etype (Id))) = N_Full_Type_Declaration 1645 and then Ekind (Etype (Id)) = E_Access_Subprogram_Type 1646 then 1647 Profile := 1648 Parameter_Specifications (Type_Definition (Parent (Etype (Id)))); 1649 else 1650 return; 1651 end if; 1652 end if; 1653 1654 -- Iterate through the parameter specification list, checking that 1655 -- no access parameter and no limited type parameter in the list. 1656 -- RM E.2.3(14). 1657 1658 if Present (Profile) then 1659 Param_Spec := First (Profile); 1660 while Present (Param_Spec) loop 1661 Param_Type := Etype (Defining_Identifier (Param_Spec)); 1662 1663 if Ekind (Param_Type) = E_Anonymous_Access_Type then 1664 if K = N_Subprogram_Declaration then 1665 Error_Node := Param_Spec; 1666 end if; 1667 1668 -- Report error only if declaration is in source program 1669 1670 if Comes_From_Source (Id) then 1671 Error_Msg_N 1672 ("subprogram in 'R'C'I unit cannot have access parameter", 1673 Error_Node); 1674 end if; 1675 1676 -- For a limited private type parameter, we check only the private 1677 -- declaration and ignore full type declaration, unless this is 1678 -- the only declaration for the type, e.g., as a limited record. 1679 1680 elsif No_External_Streaming (Param_Type) then 1681 if K = N_Subprogram_Declaration then 1682 Error_Node := Param_Spec; 1683 end if; 1684 1685 Error_Msg_NE 1686 ("formal of remote subprogram& " 1687 & "must support external streaming", 1688 Error_Node, Id); 1689 if Is_Limited_Type (Param_Type) then 1690 Explain_Limited_Type (Param_Type, Error_Node); 1691 end if; 1692 end if; 1693 1694 Next (Param_Spec); 1695 end loop; 1696 end if; 1697 1698 if Ekind (Id) = E_Function 1699 and then Ekind (Etype (Id)) = E_Anonymous_Access_Type 1700 and then Comes_From_Source (Id) 1701 then 1702 Error_Msg_N 1703 ("function in 'R'C'I unit cannot have access result", 1704 Error_Node); 1705 end if; 1706 end Validate_RCI_Subprogram_Declaration; 1707 1708 ---------------------------------------------------- 1709 -- Validate_Remote_Access_Object_Type_Declaration -- 1710 ---------------------------------------------------- 1711 1712 procedure Validate_Remote_Access_Object_Type_Declaration (T : Entity_Id) is 1713 Direct_Designated_Type : Entity_Id; 1714 Desig_Type : Entity_Id; 1715 1716 begin 1717 -- We are called from Analyze_Full_Type_Declaration, and the Nkind of 1718 -- the given node is N_Access_To_Object_Definition. 1719 1720 if not Comes_From_Source (T) 1721 or else (not In_RCI_Declaration and then not In_RT_Declaration) 1722 then 1723 return; 1724 end if; 1725 1726 -- An access definition in the private part of a package is not a 1727 -- remote access type. Restrictions related to external streaming 1728 -- support for non-remote access types are enforced elsewhere. Note 1729 -- that In_Private_Part is never set on type entities: check flag 1730 -- on enclosing scope. 1731 1732 if In_Private_Part (Scope (T)) then 1733 return; 1734 end if; 1735 1736 -- Check RCI or RT unit type declaration. It may not contain the 1737 -- declaration of an access-to-object type unless it is a general access 1738 -- type that designates a class-wide limited private type or subtype. 1739 -- There are also constraints on the primitive subprograms of the 1740 -- class-wide type (RM E.2.2(14), see Validate_RACW_Primitives). 1741 1742 if Ekind (T) /= E_General_Access_Type 1743 or else not Is_Class_Wide_Type (Designated_Type (T)) 1744 then 1745 if In_RCI_Declaration then 1746 Error_Msg_N 1747 ("error in access type in Remote_Call_Interface unit", T); 1748 else 1749 Error_Msg_N 1750 ("error in access type in Remote_Types unit", T); 1751 end if; 1752 1753 Error_Msg_N ("\must be general access to class-wide type", T); 1754 return; 1755 end if; 1756 1757 Direct_Designated_Type := Designated_Type (T); 1758 Desig_Type := Etype (Direct_Designated_Type); 1759 1760 -- Why is this check not in Validate_Remote_Access_To_Class_Wide_Type??? 1761 1762 if not Is_Valid_Remote_Object_Type (Desig_Type) then 1763 Error_Msg_N 1764 ("error in designated type of remote access to class-wide type", T); 1765 Error_Msg_N 1766 ("\must be tagged limited private or private extension", T); 1767 return; 1768 end if; 1769 end Validate_Remote_Access_Object_Type_Declaration; 1770 1771 ----------------------------------------------- 1772 -- Validate_Remote_Access_To_Class_Wide_Type -- 1773 ----------------------------------------------- 1774 1775 procedure Validate_Remote_Access_To_Class_Wide_Type (N : Node_Id) is 1776 K : constant Node_Kind := Nkind (N); 1777 PK : constant Node_Kind := Nkind (Parent (N)); 1778 E : Entity_Id; 1779 1780 begin 1781 -- This subprogram enforces the checks in (RM E.2.2(8)) for certain uses 1782 -- of class-wide limited private types. 1783 1784 -- Storage_Pool and Storage_Size are not defined for such types 1785 -- 1786 -- The expected type of allocator must not be such a type. 1787 1788 -- The actual parameter of generic instantiation must not be such a 1789 -- type if the formal parameter is of an access type. 1790 1791 -- On entry, there are several cases: 1792 1793 -- 1. called from sem_attr Analyze_Attribute where attribute name is 1794 -- either Storage_Pool or Storage_Size. 1795 1796 -- 2. called from exp_ch4 Expand_N_Allocator 1797 1798 -- 3. called from sem_ch4 Analyze_Explicit_Dereference 1799 1800 -- 4. called from sem_res Resolve_Actuals 1801 1802 if K = N_Attribute_Reference then 1803 E := Etype (Prefix (N)); 1804 1805 if Is_Remote_Access_To_Class_Wide_Type (E) then 1806 Error_Msg_N ("incorrect attribute of remote operand", N); 1807 return; 1808 end if; 1809 1810 elsif K = N_Allocator then 1811 E := Etype (N); 1812 1813 if Is_Remote_Access_To_Class_Wide_Type (E) then 1814 Error_Msg_N ("incorrect expected remote type of allocator", N); 1815 return; 1816 end if; 1817 1818 -- This subprogram also enforces the checks in E.2.2(13). A value of 1819 -- such type must not be dereferenced unless as controlling operand of 1820 -- a dispatching call. Explicit dereferences not coming from source are 1821 -- exempted from this checking because the expander produces them in 1822 -- some cases (such as for tag checks on dispatching calls with multiple 1823 -- controlling operands). However we do check in the case of an implicit 1824 -- dereference that is expanded to an explicit dereference (hence the 1825 -- test of whether Original_Node (N) comes from source). 1826 1827 elsif K = N_Explicit_Dereference 1828 and then Comes_From_Source (Original_Node (N)) 1829 then 1830 E := Etype (Prefix (N)); 1831 1832 -- If the class-wide type is not a remote one, the restrictions 1833 -- do not apply. 1834 1835 if not Is_Remote_Access_To_Class_Wide_Type (E) then 1836 return; 1837 end if; 1838 1839 -- If we have a true dereference that comes from source and that 1840 -- is a controlling argument for a dispatching call, accept it. 1841 1842 if Is_Actual_Parameter (N) and then Is_Controlling_Actual (N) then 1843 return; 1844 end if; 1845 1846 -- If we are just within a procedure or function call and the 1847 -- dereference has not been analyzed, return because this procedure 1848 -- will be called again from sem_res Resolve_Actuals. The same can 1849 -- apply in the case of dereference that is the prefix of a selected 1850 -- component, which can be a call given in prefixed form. 1851 1852 if (Is_Actual_Parameter (N) or else PK = N_Selected_Component) 1853 and then not Analyzed (N) 1854 then 1855 return; 1856 end if; 1857 1858 -- We must allow expanded code to generate a reference to the tag of 1859 -- the designated object (may be either the actual tag, or the stub 1860 -- tag in the case of a remote object). 1861 1862 if PK = N_Selected_Component 1863 and then Is_Tag (Entity (Selector_Name (Parent (N)))) 1864 then 1865 return; 1866 end if; 1867 1868 Error_Msg_N 1869 ("invalid dereference of a remote access-to-class-wide value", N); 1870 end if; 1871 end Validate_Remote_Access_To_Class_Wide_Type; 1872 1873 ------------------------------------------ 1874 -- Validate_Remote_Type_Type_Conversion -- 1875 ------------------------------------------ 1876 1877 procedure Validate_Remote_Type_Type_Conversion (N : Node_Id) is 1878 S : constant Entity_Id := Etype (N); 1879 E : constant Entity_Id := Etype (Expression (N)); 1880 1881 begin 1882 -- This test is required in the case where a conversion appears inside a 1883 -- normal package, it does not necessarily have to be inside an RCI, 1884 -- Remote_Types unit (RM E.2.2(9,12)). 1885 1886 if Is_Remote_Access_To_Subprogram_Type (E) 1887 and then not Is_Remote_Access_To_Subprogram_Type (S) 1888 then 1889 Error_Msg_N 1890 ("incorrect conversion of remote operand to local type", N); 1891 return; 1892 1893 elsif not Is_Remote_Access_To_Subprogram_Type (E) 1894 and then Is_Remote_Access_To_Subprogram_Type (S) 1895 then 1896 Error_Msg_N 1897 ("incorrect conversion of local operand to remote type", N); 1898 return; 1899 1900 elsif Is_Remote_Access_To_Class_Wide_Type (E) 1901 and then not Is_Remote_Access_To_Class_Wide_Type (S) 1902 then 1903 Error_Msg_N 1904 ("incorrect conversion of remote operand to local type", N); 1905 return; 1906 end if; 1907 1908 -- If a local access type is converted into a RACW type, then the 1909 -- current unit has a pointer that may now be exported to another 1910 -- partition. 1911 1912 if Is_Remote_Access_To_Class_Wide_Type (S) 1913 and then not Is_Remote_Access_To_Class_Wide_Type (E) 1914 then 1915 Set_Has_RACW (Current_Sem_Unit); 1916 end if; 1917 end Validate_Remote_Type_Type_Conversion; 1918 1919 ------------------------------- 1920 -- Validate_RT_RAT_Component -- 1921 ------------------------------- 1922 1923 procedure Validate_RT_RAT_Component (N : Node_Id) is 1924 Spec : constant Node_Id := Specification (N); 1925 Name_U : constant Entity_Id := Defining_Entity (Spec); 1926 Typ : Entity_Id; 1927 U_Typ : Entity_Id; 1928 First_Priv_Ent : constant Entity_Id := First_Private_Entity (Name_U); 1929 1930 function Stream_Attributes_Available (Typ : Entity_Id) return Boolean; 1931 -- True if any stream attribute is available for Typ 1932 1933 --------------------------------- 1934 -- Stream_Attributes_Available -- 1935 --------------------------------- 1936 1937 function Stream_Attributes_Available (Typ : Entity_Id) return Boolean 1938 is 1939 begin 1940 return Stream_Attribute_Available (Typ, TSS_Stream_Read) 1941 or else 1942 Stream_Attribute_Available (Typ, TSS_Stream_Write) 1943 or else 1944 Stream_Attribute_Available (Typ, TSS_Stream_Input) 1945 or else 1946 Stream_Attribute_Available (Typ, TSS_Stream_Output); 1947 end Stream_Attributes_Available; 1948 1949 -- Start of processing for Validate_RT_RAT_Component 1950 1951 begin 1952 if not Is_Remote_Types (Name_U) then 1953 return; 1954 end if; 1955 1956 Typ := First_Entity (Name_U); 1957 while Present (Typ) and then Typ /= First_Priv_Ent loop 1958 U_Typ := Underlying_Type (Base_Type (Typ)); 1959 1960 if No (U_Typ) then 1961 U_Typ := Typ; 1962 end if; 1963 1964 if Comes_From_Source (Typ) and then Is_Type (Typ) then 1965 1966 -- Check that the type can be meaningfully transmitted to another 1967 -- partition (E.2.2(8)). 1968 1969 if (Ada_Version < Ada_2005 and then Has_Non_Remote_Access (U_Typ)) 1970 or else (Stream_Attributes_Available (Typ) 1971 and then No_External_Streaming (U_Typ)) 1972 then 1973 if Is_Non_Remote_Access_Type (Typ) then 1974 Error_Msg_N ("error in non-remote access type", U_Typ); 1975 else 1976 Error_Msg_N 1977 ("error in record type containing a component of a " & 1978 "non-remote access type", U_Typ); 1979 end if; 1980 1981 if Ada_Version >= Ada_2005 then 1982 Error_Msg_N 1983 ("\must have visible Read and Write attribute " & 1984 "definition clauses (RM E.2.2(8))", U_Typ); 1985 else 1986 Error_Msg_N 1987 ("\must have Read and Write attribute " & 1988 "definition clauses (RM E.2.2(8))", U_Typ); 1989 end if; 1990 end if; 1991 end if; 1992 1993 Next_Entity (Typ); 1994 end loop; 1995 end Validate_RT_RAT_Component; 1996 1997 ----------------------------------------- 1998 -- Validate_SP_Access_Object_Type_Decl -- 1999 ----------------------------------------- 2000 2001 procedure Validate_SP_Access_Object_Type_Decl (T : Entity_Id) is 2002 Direct_Designated_Type : Entity_Id; 2003 2004 function Has_Entry_Declarations (E : Entity_Id) return Boolean; 2005 -- Return true if the protected type designated by T has entry 2006 -- declarations. 2007 2008 ---------------------------- 2009 -- Has_Entry_Declarations -- 2010 ---------------------------- 2011 2012 function Has_Entry_Declarations (E : Entity_Id) return Boolean is 2013 Ety : Entity_Id; 2014 2015 begin 2016 if Nkind (Parent (E)) = N_Protected_Type_Declaration then 2017 Ety := First_Entity (E); 2018 while Present (Ety) loop 2019 if Ekind (Ety) = E_Entry then 2020 return True; 2021 end if; 2022 2023 Next_Entity (Ety); 2024 end loop; 2025 end if; 2026 2027 return False; 2028 end Has_Entry_Declarations; 2029 2030 -- Start of processing for Validate_SP_Access_Object_Type_Decl 2031 2032 begin 2033 -- We are called from Sem_Ch3.Analyze_Full_Type_Declaration, and the 2034 -- Nkind of the given entity is N_Access_To_Object_Definition. 2035 2036 if not Comes_From_Source (T) 2037 or else not In_Shared_Passive_Unit 2038 or else In_Subprogram_Task_Protected_Unit 2039 then 2040 return; 2041 end if; 2042 2043 -- Check Shared Passive unit. It should not contain the declaration 2044 -- of an access-to-object type whose designated type is a class-wide 2045 -- type, task type or protected type with entry (RM E.2.1(7)). 2046 2047 Direct_Designated_Type := Designated_Type (T); 2048 2049 if Ekind (Direct_Designated_Type) = E_Class_Wide_Type then 2050 Error_Msg_N 2051 ("invalid access-to-class-wide type in shared passive unit", T); 2052 return; 2053 2054 elsif Ekind (Direct_Designated_Type) in Task_Kind then 2055 Error_Msg_N 2056 ("invalid access-to-task type in shared passive unit", T); 2057 return; 2058 2059 elsif Ekind (Direct_Designated_Type) in Protected_Kind 2060 and then Has_Entry_Declarations (Direct_Designated_Type) 2061 then 2062 Error_Msg_N 2063 ("invalid access-to-protected type in shared passive unit", T); 2064 return; 2065 end if; 2066 end Validate_SP_Access_Object_Type_Decl; 2067 2068 --------------------------------- 2069 -- Validate_Static_Object_Name -- 2070 --------------------------------- 2071 2072 procedure Validate_Static_Object_Name (N : Node_Id) is 2073 E : Entity_Id; 2074 Val : Node_Id; 2075 2076 function Is_Primary (N : Node_Id) return Boolean; 2077 -- Determine whether node is syntactically a primary in an expression 2078 -- This function should probably be somewhere else ??? 2079 -- 2080 -- Also it does not do what it says, e.g if N is a binary operator 2081 -- whose parent is a binary operator, Is_Primary returns True ??? 2082 2083 ---------------- 2084 -- Is_Primary -- 2085 ---------------- 2086 2087 function Is_Primary (N : Node_Id) return Boolean is 2088 K : constant Node_Kind := Nkind (Parent (N)); 2089 2090 begin 2091 case K is 2092 when N_Op | N_Membership_Test => 2093 return True; 2094 2095 when N_Aggregate 2096 | N_Component_Association 2097 | N_Index_Or_Discriminant_Constraint => 2098 return True; 2099 2100 when N_Attribute_Reference => 2101 return Attribute_Name (Parent (N)) /= Name_Address 2102 and then Attribute_Name (Parent (N)) /= Name_Access 2103 and then Attribute_Name (Parent (N)) /= Name_Unchecked_Access 2104 and then 2105 Attribute_Name (Parent (N)) /= Name_Unrestricted_Access; 2106 2107 when N_Indexed_Component => 2108 return (N /= Prefix (Parent (N)) 2109 or else Is_Primary (Parent (N))); 2110 2111 when N_Qualified_Expression | N_Type_Conversion => 2112 return Is_Primary (Parent (N)); 2113 2114 when N_Assignment_Statement | N_Object_Declaration => 2115 return (N = Expression (Parent (N))); 2116 2117 when N_Selected_Component => 2118 return Is_Primary (Parent (N)); 2119 2120 when others => 2121 return False; 2122 end case; 2123 end Is_Primary; 2124 2125 -- Start of processing for Validate_Static_Object_Name 2126 2127 begin 2128 if not In_Preelaborated_Unit 2129 or else not Comes_From_Source (N) 2130 or else In_Subprogram_Or_Concurrent_Unit 2131 or else Ekind (Current_Scope) = E_Block 2132 then 2133 return; 2134 2135 -- Filter out cases where primary is default in a component declaration, 2136 -- discriminant specification, or actual in a record type initialization 2137 -- call. 2138 2139 -- Initialization call of internal types 2140 2141 elsif Nkind (Parent (N)) = N_Procedure_Call_Statement then 2142 2143 if Present (Parent (Parent (N))) 2144 and then Nkind (Parent (Parent (N))) = N_Freeze_Entity 2145 then 2146 return; 2147 end if; 2148 2149 if Nkind (Name (Parent (N))) = N_Identifier 2150 and then not Comes_From_Source (Entity (Name (Parent (N)))) 2151 then 2152 return; 2153 end if; 2154 end if; 2155 2156 -- Error if the name is a primary in an expression. The parent must not 2157 -- be an operator, or a selected component or an indexed component that 2158 -- is itself a primary. Entities that are actuals do not need to be 2159 -- checked, because the call itself will be diagnosed. 2160 2161 if Is_Primary (N) 2162 and then (not Inside_A_Generic 2163 or else Present (Enclosing_Generic_Body (N))) 2164 then 2165 if Ekind (Entity (N)) = E_Variable 2166 or else Ekind (Entity (N)) in Formal_Object_Kind 2167 then 2168 Flag_Non_Static_Expr 2169 ("non-static object name in preelaborated unit", N); 2170 2171 -- Give an error for a reference to a nonstatic constant, unless the 2172 -- constant is in another GNAT library unit that is preelaborable. 2173 2174 elsif Ekind (Entity (N)) = E_Constant 2175 and then not Is_Static_Expression (N) 2176 then 2177 E := Entity (N); 2178 Val := Constant_Value (E); 2179 2180 if Is_Internal_File_Name (Unit_File_Name (Get_Source_Unit (N))) 2181 and then 2182 Enclosing_Comp_Unit_Node (N) /= Enclosing_Comp_Unit_Node (E) 2183 and then (Is_Preelaborated (Scope (E)) 2184 or else Is_Pure (Scope (E)) 2185 or else (Present (Renamed_Object (E)) 2186 and then Is_Entity_Name (Renamed_Object (E)) 2187 and then 2188 (Is_Preelaborated 2189 (Scope (Renamed_Object (E))) 2190 or else 2191 Is_Pure 2192 (Scope (Renamed_Object (E)))))) 2193 then 2194 null; 2195 2196 -- If the value of the constant is a local variable that renames 2197 -- an aggregate, this is in itself legal. The aggregate may be 2198 -- expanded into a loop, but this does not affect preelaborability 2199 -- in itself. If some aggregate components are non-static, that is 2200 -- to say if they involve non static primaries, they will be 2201 -- flagged when analyzed. 2202 2203 elsif Present (Val) 2204 and then Is_Entity_Name (Val) 2205 and then Is_Array_Type (Etype (Val)) 2206 and then not Comes_From_Source (Val) 2207 and then Nkind (Original_Node (Val)) = N_Aggregate 2208 then 2209 null; 2210 2211 -- This is the error case 2212 2213 else 2214 -- In GNAT mode or Relaxed RM Semantic mode, this is just a 2215 -- warning, to allow it to be judiciously turned off. 2216 -- Otherwise it is a real error. 2217 2218 if GNAT_Mode or Relaxed_RM_Semantics then 2219 Error_Msg_N 2220 ("??non-static constant in preelaborated unit", N); 2221 else 2222 Flag_Non_Static_Expr 2223 ("non-static constant in preelaborated unit", N); 2224 end if; 2225 end if; 2226 end if; 2227 end if; 2228 end Validate_Static_Object_Name; 2229 2230end Sem_Cat; 2231