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