1------------------------------------------------------------------------------ 2-- -- 3-- GNAT COMPILER COMPONENTS -- 4-- -- 5-- L I B . L O A D -- 6-- -- 7-- B o d y -- 8-- -- 9-- Copyright (C) 1992-2013, 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 Errout; use Errout; 30with Fname; use Fname; 31with Fname.UF; use Fname.UF; 32with Nlists; use Nlists; 33with Nmake; use Nmake; 34with Opt; use Opt; 35with Osint; use Osint; 36with Osint.C; use Osint.C; 37with Output; use Output; 38with Par; 39with Restrict; use Restrict; 40with Scn; use Scn; 41with Sinfo; use Sinfo; 42with Sinput; use Sinput; 43with Sinput.L; use Sinput.L; 44with Stand; use Stand; 45with Tbuild; use Tbuild; 46with Uname; use Uname; 47 48package body Lib.Load is 49 50 ----------------------- 51 -- Local Subprograms -- 52 ----------------------- 53 54 function From_Limited_With_Chain return Boolean; 55 -- Check whether a possible circular dependence includes units that 56 -- have been loaded through limited_with clauses, in which case there 57 -- is no real circularity. 58 59 function Spec_Is_Irrelevant 60 (Spec_Unit : Unit_Number_Type; 61 Body_Unit : Unit_Number_Type) return Boolean; 62 -- The Spec_Unit and Body_Unit parameters are the unit numbers of the 63 -- spec file that corresponds to the main unit which is a body. This 64 -- function determines if the spec file is irrelevant and will be 65 -- overridden by the body as described in RM 10.1.4(4). See description 66 -- in "Special Handling of Subprogram Bodies" for further details. 67 68 procedure Write_Dependency_Chain; 69 -- This procedure is used to generate error message info lines that 70 -- trace the current dependency chain when a load error occurs. 71 72 ------------------------------ 73 -- Change_Main_Unit_To_Spec -- 74 ------------------------------ 75 76 procedure Change_Main_Unit_To_Spec is 77 U : Unit_Record renames Units.Table (Main_Unit); 78 N : File_Name_Type; 79 X : Source_File_Index; 80 81 begin 82 -- Get name of unit body 83 84 Get_Name_String (U.Unit_File_Name); 85 86 -- Note: for the following we should really generalize and consult the 87 -- file name pattern data, but for now we just deal with the common 88 -- naming cases, which is probably good enough in practice ??? 89 90 -- Change .adb to .ads 91 92 if Name_Len >= 5 93 and then Name_Buffer (Name_Len - 3 .. Name_Len) = ".adb" 94 then 95 Name_Buffer (Name_Len) := 's'; 96 97 -- Change .2.ada to .1.ada (Rational convention) 98 99 elsif Name_Len >= 7 100 and then Name_Buffer (Name_Len - 5 .. Name_Len) = ".2.ada" 101 then 102 Name_Buffer (Name_Len - 4) := '1'; 103 104 -- Change .ada to _.ada (DEC convention) 105 106 elsif Name_Len >= 5 107 and then Name_Buffer (Name_Len - 3 .. Name_Len) = ".ada" 108 then 109 Name_Buffer (Name_Len - 3 .. Name_Len + 1) := "_.ada"; 110 Name_Len := Name_Len + 1; 111 112 -- No match, don't make the change 113 114 else 115 return; 116 end if; 117 118 -- Try loading the spec 119 120 N := Name_Find; 121 X := Load_Source_File (N); 122 123 -- No change if we did not find the spec 124 125 if X = No_Source_File then 126 return; 127 end if; 128 129 -- Otherwise modify Main_Unit entry to point to spec 130 131 U.Unit_File_Name := N; 132 U.Source_Index := X; 133 end Change_Main_Unit_To_Spec; 134 135 ------------------------------- 136 -- Create_Dummy_Package_Unit -- 137 ------------------------------- 138 139 function Create_Dummy_Package_Unit 140 (With_Node : Node_Id; 141 Spec_Name : Unit_Name_Type) return Unit_Number_Type 142 is 143 Unum : Unit_Number_Type; 144 Cunit_Entity : Entity_Id; 145 Cunit : Node_Id; 146 Du_Name : Node_Or_Entity_Id; 147 End_Lab : Node_Id; 148 Save_CS : constant Boolean := Get_Comes_From_Source_Default; 149 150 begin 151 -- The created dummy package unit does not come from source 152 153 Set_Comes_From_Source_Default (False); 154 155 -- Normal package 156 157 if Nkind (Name (With_Node)) = N_Identifier then 158 Cunit_Entity := 159 Make_Defining_Identifier (No_Location, 160 Chars => Chars (Name (With_Node))); 161 Du_Name := Cunit_Entity; 162 End_Lab := New_Occurrence_Of (Cunit_Entity, No_Location); 163 164 -- Child package 165 166 else 167 Cunit_Entity := 168 Make_Defining_Identifier (No_Location, 169 Chars => Chars (Selector_Name (Name (With_Node)))); 170 Du_Name := 171 Make_Defining_Program_Unit_Name (No_Location, 172 Name => Copy_Separate_Tree (Prefix (Name (With_Node))), 173 Defining_Identifier => Cunit_Entity); 174 175 Set_Is_Child_Unit (Cunit_Entity); 176 177 End_Lab := 178 Make_Designator (No_Location, 179 Name => Copy_Separate_Tree (Prefix (Name (With_Node))), 180 Identifier => New_Occurrence_Of (Cunit_Entity, No_Location)); 181 end if; 182 183 Set_Scope (Cunit_Entity, Standard_Standard); 184 185 Cunit := 186 Make_Compilation_Unit (No_Location, 187 Context_Items => Empty_List, 188 Unit => 189 Make_Package_Declaration (No_Location, 190 Specification => 191 Make_Package_Specification (No_Location, 192 Defining_Unit_Name => Du_Name, 193 Visible_Declarations => Empty_List, 194 End_Label => End_Lab)), 195 Aux_Decls_Node => 196 Make_Compilation_Unit_Aux (No_Location)); 197 198 -- Mark the dummy package as analyzed to prevent analysis of this 199 -- (non-existent) unit in -gnatQ mode because at the moment the 200 -- structure and attributes of this dummy package does not allow 201 -- a normal analysis of this unit 202 203 Set_Analyzed (Cunit); 204 205 Units.Increment_Last; 206 Unum := Units.Last; 207 208 Units.Table (Unum) := ( 209 Cunit => Cunit, 210 Cunit_Entity => Cunit_Entity, 211 Dependency_Num => 0, 212 Dynamic_Elab => False, 213 Error_Location => Sloc (With_Node), 214 Expected_Unit => Spec_Name, 215 Fatal_Error => True, 216 Generate_Code => False, 217 Has_Allocator => False, 218 Has_RACW => False, 219 Is_Compiler_Unit => False, 220 Ident_String => Empty, 221 Loading => False, 222 Main_Priority => Default_Main_Priority, 223 Main_CPU => Default_Main_CPU, 224 Munit_Index => 0, 225 Serial_Number => 0, 226 Source_Index => No_Source_File, 227 Unit_File_Name => Get_File_Name (Spec_Name, Subunit => False), 228 Unit_Name => Spec_Name, 229 Version => 0, 230 OA_Setting => 'O', 231 SPARK_Mode_Pragma => Empty); 232 233 Set_Comes_From_Source_Default (Save_CS); 234 Set_Error_Posted (Cunit_Entity); 235 Set_Error_Posted (Cunit); 236 return Unum; 237 end Create_Dummy_Package_Unit; 238 239 ----------------------------- 240 -- From_Limited_With_Chain -- 241 ----------------------------- 242 243 function From_Limited_With_Chain return Boolean is 244 Curr_Num : constant Unit_Number_Type := 245 Load_Stack.Table (Load_Stack.Last).Unit_Number; 246 247 begin 248 -- True if the current load operation is through a limited_with clause 249 -- and we are not within a loop of regular with_clauses. 250 251 for U in reverse Load_Stack.First .. Load_Stack.Last - 1 loop 252 if Load_Stack.Table (U).Unit_Number = Curr_Num then 253 return False; 254 255 elsif Present (Load_Stack.Table (U).With_Node) 256 and then Limited_Present (Load_Stack.Table (U).With_Node) 257 then 258 return True; 259 end if; 260 end loop; 261 262 return False; 263 end From_Limited_With_Chain; 264 265 ---------------- 266 -- Initialize -- 267 ---------------- 268 269 procedure Initialize is 270 begin 271 Units.Init; 272 Load_Stack.Init; 273 end Initialize; 274 275 ------------------------ 276 -- Initialize_Version -- 277 ------------------------ 278 279 procedure Initialize_Version (U : Unit_Number_Type) is 280 begin 281 Units.Table (U).Version := Source_Checksum (Source_Index (U)); 282 end Initialize_Version; 283 284 ---------------------- 285 -- Load_Main_Source -- 286 ---------------------- 287 288 procedure Load_Main_Source is 289 Fname : File_Name_Type; 290 Version : Word := 0; 291 292 begin 293 Load_Stack.Increment_Last; 294 Load_Stack.Table (Load_Stack.Last) := (Main_Unit, Empty); 295 296 -- Initialize unit table entry for Main_Unit. Note that we don't know 297 -- the unit name yet, that gets filled in when the parser parses the 298 -- main unit, at which time a check is made that it matches the main 299 -- file name, and then the Unit_Name field is set. The Cunit and 300 -- Cunit_Entity fields also get filled in later by the parser. 301 302 Units.Increment_Last; 303 Fname := Next_Main_Source; 304 305 Units.Table (Main_Unit).Unit_File_Name := Fname; 306 307 if Fname /= No_File then 308 Main_Source_File := Load_Source_File (Fname); 309 Current_Error_Source_File := Main_Source_File; 310 311 if Main_Source_File /= No_Source_File then 312 Version := Source_Checksum (Main_Source_File); 313 end if; 314 315 Units.Table (Main_Unit) := ( 316 Cunit => Empty, 317 Cunit_Entity => Empty, 318 Dependency_Num => 0, 319 Dynamic_Elab => False, 320 Error_Location => No_Location, 321 Expected_Unit => No_Unit_Name, 322 Fatal_Error => False, 323 Generate_Code => False, 324 Has_Allocator => False, 325 Has_RACW => False, 326 Is_Compiler_Unit => False, 327 Ident_String => Empty, 328 Loading => True, 329 Main_Priority => Default_Main_Priority, 330 Main_CPU => Default_Main_CPU, 331 Munit_Index => 0, 332 Serial_Number => 0, 333 Source_Index => Main_Source_File, 334 Unit_File_Name => Fname, 335 Unit_Name => No_Unit_Name, 336 Version => Version, 337 OA_Setting => 'O', 338 SPARK_Mode_Pragma => Empty); 339 end if; 340 end Load_Main_Source; 341 342 --------------- 343 -- Load_Unit -- 344 --------------- 345 346 function Load_Unit 347 (Load_Name : Unit_Name_Type; 348 Required : Boolean; 349 Error_Node : Node_Id; 350 Subunit : Boolean; 351 Corr_Body : Unit_Number_Type := No_Unit; 352 Renamings : Boolean := False; 353 With_Node : Node_Id := Empty; 354 PMES : Boolean := False) return Unit_Number_Type 355 is 356 Calling_Unit : Unit_Number_Type; 357 Uname_Actual : Unit_Name_Type; 358 Unum : Unit_Number_Type; 359 Unump : Unit_Number_Type; 360 Fname : File_Name_Type; 361 Src_Ind : Source_File_Index; 362 Save_PMES : constant Boolean := Parsing_Main_Extended_Source; 363 364 Save_Cunit_Restrictions : constant Save_Cunit_Boolean_Restrictions := 365 Cunit_Boolean_Restrictions_Save; 366 -- Save current restrictions for restore at end 367 368 begin 369 Parsing_Main_Extended_Source := PMES; 370 371 -- Initialize restrictions to config restrictions for unit to load if 372 -- it is part of the main extended source, otherwise reset them. 373 374 -- Note: it's a bit odd but PMES is False for subunits, which is why 375 -- we have the OR here. Should be investigated some time??? 376 377 if PMES or Subunit then 378 Restore_Config_Cunit_Boolean_Restrictions; 379 else 380 Reset_Cunit_Boolean_Restrictions; 381 end if; 382 383 -- If renamings are allowed and we have a child unit name, then we 384 -- must first load the parent to deal with finding the real name. 385 -- Retain the with_clause that names the child, so that if it is 386 -- limited, the parent is loaded under the same condition. 387 388 if Renamings and then Is_Child_Name (Load_Name) then 389 Unump := 390 Load_Unit 391 (Load_Name => Get_Parent_Spec_Name (Load_Name), 392 Required => Required, 393 Subunit => False, 394 Renamings => True, 395 Error_Node => Error_Node, 396 With_Node => With_Node); 397 398 if Unump = No_Unit then 399 Parsing_Main_Extended_Source := Save_PMES; 400 return No_Unit; 401 end if; 402 403 -- If parent is a renaming, then we use the renamed package as 404 -- the actual parent for the subsequent load operation. 405 406 if Nkind (Unit (Cunit (Unump))) = N_Package_Renaming_Declaration then 407 Uname_Actual := 408 New_Child 409 (Load_Name, Get_Unit_Name (Name (Unit (Cunit (Unump))))); 410 411 -- If the load is for a with_clause, for visibility purposes both 412 -- the renamed entity and renaming one must be available in the 413 -- current unit: the renamed one in order to retrieve the child 414 -- unit, and the original one because it may be used as a prefix 415 -- in the body of the current unit. We add an explicit with_clause 416 -- for the original parent so that the renaming declaration is 417 -- properly loaded and analyzed. 418 419 if Present (With_Node) then 420 Insert_After (With_Node, 421 Make_With_Clause (Sloc (With_Node), 422 Name => Copy_Separate_Tree (Prefix (Name (With_Node))))); 423 end if; 424 425 -- Save the renaming entity, to establish its visibility when 426 -- installing the context. The implicit with is on this entity, 427 -- not on the package it renames. This is somewhat redundant given 428 -- the with_clause just created, but it simplifies subsequent 429 -- expansion of the current with_clause. Optimizable ??? 430 431 if Nkind (Error_Node) = N_With_Clause 432 and then Nkind (Name (Error_Node)) = N_Selected_Component 433 then 434 declare 435 Par : Node_Id := Name (Error_Node); 436 437 begin 438 while Nkind (Par) = N_Selected_Component 439 and then Chars (Selector_Name (Par)) /= 440 Chars (Cunit_Entity (Unump)) 441 loop 442 Par := Prefix (Par); 443 end loop; 444 445 -- Case of some intermediate parent is a renaming 446 447 if Nkind (Par) = N_Selected_Component then 448 Set_Entity (Selector_Name (Par), Cunit_Entity (Unump)); 449 450 -- Case where the ultimate parent is a renaming 451 452 else 453 Set_Entity (Par, Cunit_Entity (Unump)); 454 end if; 455 end; 456 end if; 457 458 -- If the parent is not a renaming, then get its name (this may 459 -- be different from the parent spec name obtained above because 460 -- of renamings higher up in the hierarchy). 461 462 else 463 Uname_Actual := New_Child (Load_Name, Unit_Name (Unump)); 464 end if; 465 466 -- Here if unit to be loaded is not a child unit 467 468 else 469 Uname_Actual := Load_Name; 470 end if; 471 472 Fname := Get_File_Name (Uname_Actual, Subunit); 473 474 if Debug_Flag_L then 475 Write_Eol; 476 Write_Str ("*** Load request for unit: "); 477 Write_Unit_Name (Load_Name); 478 479 if Required then 480 Write_Str (" (Required = True)"); 481 else 482 Write_Str (" (Required = False)"); 483 end if; 484 485 Write_Eol; 486 487 if Uname_Actual /= Load_Name then 488 Write_Str ("*** Actual unit loaded: "); 489 Write_Unit_Name (Uname_Actual); 490 end if; 491 end if; 492 493 -- Capture error location if it is for the main unit. The idea is to 494 -- post errors on the main unit location, not the most recent unit. 495 -- Note: Unit_Name (Main_Unit) is not set if we are parsing gnat.adc. 496 497 if Present (Error_Node) 498 and then Unit_Name (Main_Unit) /= No_Unit_Name 499 then 500 -- It seems like In_Extended_Main_Source_Unit (Error_Node) would 501 -- do the trick here, but that's wrong, it is much too early to 502 -- call this routine. We are still in the parser, and the required 503 -- semantic information is not established yet. So we base the 504 -- judgment on unit names. 505 506 Get_External_Unit_Name_String (Unit_Name (Main_Unit)); 507 508 declare 509 Main_Unit_Name : constant String := Name_Buffer (1 .. Name_Len); 510 511 begin 512 Get_External_Unit_Name_String 513 (Unit_Name (Get_Source_Unit (Error_Node))); 514 515 -- If the two names are identical, then for sure we are part 516 -- of the extended main unit 517 518 if Main_Unit_Name = Name_Buffer (1 .. Name_Len) then 519 Load_Msg_Sloc := Sloc (Error_Node); 520 521 -- If the load is called from a with_type clause, the error 522 -- node is correct. 523 524 -- Otherwise, check for the subunit case, and if so, consider 525 -- we have a match if one name is a prefix of the other name. 526 527 else 528 if Nkind (Unit (Cunit (Main_Unit))) = N_Subunit 529 or else 530 Nkind (Unit (Cunit (Get_Source_Unit (Error_Node)))) = 531 N_Subunit 532 then 533 Name_Len := Integer'Min (Name_Len, Main_Unit_Name'Length); 534 535 if Name_Buffer (1 .. Name_Len) 536 = 537 Main_Unit_Name (1 .. Name_Len) 538 then 539 Load_Msg_Sloc := Sloc (Error_Node); 540 end if; 541 end if; 542 end if; 543 end; 544 end if; 545 546 -- If we are generating error messages, then capture calling unit 547 548 if Present (Error_Node) then 549 Calling_Unit := Get_Source_Unit (Error_Node); 550 else 551 Calling_Unit := No_Unit; 552 end if; 553 554 -- See if we already have an entry for this unit 555 556 Unum := Main_Unit; 557 while Unum <= Units.Last loop 558 exit when Uname_Actual = Units.Table (Unum).Unit_Name; 559 Unum := Unum + 1; 560 end loop; 561 562 -- Whether or not the entry was found, Unum is now the right value, 563 -- since it is one more than Units.Last (i.e. the index of the new 564 -- entry we will create) in the not found case. 565 566 -- A special check is necessary in the unit not found case. If the unit 567 -- is not found, but the file in which it lives has already been loaded, 568 -- then we have the problem that the file does not contain the unit that 569 -- is needed. We simply treat this as a file not found condition. 570 571 -- We skip this test in multiple unit per file mode since in this 572 -- case we can have multiple units from the same source file. 573 574 if Unum > Units.Last and then Get_Unit_Index (Uname_Actual) = 0 then 575 for J in Units.First .. Units.Last loop 576 if Fname = Units.Table (J).Unit_File_Name then 577 if Debug_Flag_L then 578 Write_Str (" file does not contain unit, Unit_Number = "); 579 Write_Int (Int (Unum)); 580 Write_Eol; 581 Write_Eol; 582 end if; 583 584 if Present (Error_Node) then 585 if Is_Predefined_File_Name (Fname) then 586 Error_Msg_Unit_1 := Uname_Actual; 587 Error_Msg 588 ("$$ is not a language defined unit", Load_Msg_Sloc); 589 else 590 Error_Msg_File_1 := Fname; 591 Error_Msg_Unit_1 := Uname_Actual; 592 Error_Msg ("File{ does not contain unit$", Load_Msg_Sloc); 593 end if; 594 595 Write_Dependency_Chain; 596 Unum := No_Unit; 597 goto Done; 598 599 else 600 Unum := No_Unit; 601 goto Done; 602 end if; 603 end if; 604 end loop; 605 end if; 606 607 -- If we are proceeding with load, then make load stack entry, 608 -- and indicate the kind of with_clause responsible for the load. 609 610 Load_Stack.Increment_Last; 611 Load_Stack.Table (Load_Stack.Last) := (Unum, With_Node); 612 613 -- Case of entry already in table 614 615 if Unum <= Units.Last then 616 617 -- Here is where we check for a circular dependency, which is 618 -- an attempt to load a unit which is currently in the process 619 -- of being loaded. We do *not* care about a circular chain that 620 -- leads back to a body, because this kind of circular dependence 621 -- legitimately occurs (e.g. two package bodies that contain 622 -- inlined subprogram referenced by the other). 623 624 -- Ada 2005 (AI-50217): We also ignore limited_with clauses, because 625 -- their purpose is precisely to create legal circular structures. 626 627 if Loading (Unum) 628 and then (Is_Spec_Name (Units.Table (Unum).Unit_Name) 629 or else Acts_As_Spec (Units.Table (Unum).Cunit)) 630 and then (Nkind (Error_Node) /= N_With_Clause 631 or else not Limited_Present (Error_Node)) 632 and then not From_Limited_With_Chain 633 then 634 if Debug_Flag_L then 635 Write_Str (" circular dependency encountered"); 636 Write_Eol; 637 end if; 638 639 if Present (Error_Node) then 640 Error_Msg ("circular unit dependency", Load_Msg_Sloc); 641 Write_Dependency_Chain; 642 else 643 Load_Stack.Decrement_Last; 644 end if; 645 646 Unum := No_Unit; 647 goto Done; 648 end if; 649 650 if Debug_Flag_L then 651 Write_Str (" unit already in file table, Unit_Number = "); 652 Write_Int (Int (Unum)); 653 Write_Eol; 654 end if; 655 656 Load_Stack.Decrement_Last; 657 goto Done; 658 659 -- Unit is not already in table, so try to open the file 660 661 else 662 if Debug_Flag_L then 663 Write_Str (" attempt unit load, Unit_Number = "); 664 Write_Int (Int (Unum)); 665 Write_Eol; 666 end if; 667 668 Src_Ind := Load_Source_File (Fname); 669 670 -- Make a partial entry in the file table, used even in the file not 671 -- found case to print the dependency chain including the last entry 672 673 Units.Increment_Last; 674 Units.Table (Unum).Unit_Name := Uname_Actual; 675 676 -- File was found 677 678 if Src_Ind /= No_Source_File then 679 Units.Table (Unum) := ( 680 Cunit => Empty, 681 Cunit_Entity => Empty, 682 Dependency_Num => 0, 683 Dynamic_Elab => False, 684 Error_Location => Sloc (Error_Node), 685 Expected_Unit => Uname_Actual, 686 Fatal_Error => False, 687 Generate_Code => False, 688 Has_Allocator => False, 689 Has_RACW => False, 690 Is_Compiler_Unit => False, 691 Ident_String => Empty, 692 Loading => True, 693 Main_Priority => Default_Main_Priority, 694 Main_CPU => Default_Main_CPU, 695 Munit_Index => 0, 696 Serial_Number => 0, 697 Source_Index => Src_Ind, 698 Unit_File_Name => Fname, 699 Unit_Name => Uname_Actual, 700 Version => Source_Checksum (Src_Ind), 701 OA_Setting => 'O', 702 SPARK_Mode_Pragma => Empty); 703 704 -- Parse the new unit 705 706 declare 707 Save_Index : constant Nat := Multiple_Unit_Index; 708 Save_PMES : constant Boolean := Parsing_Main_Extended_Source; 709 710 begin 711 Multiple_Unit_Index := Get_Unit_Index (Uname_Actual); 712 Units.Table (Unum).Munit_Index := Multiple_Unit_Index; 713 Initialize_Scanner (Unum, Source_Index (Unum)); 714 715 if Calling_Unit = Main_Unit and then Subunit then 716 Parsing_Main_Extended_Source := True; 717 end if; 718 719 Discard_List (Par (Configuration_Pragmas => False)); 720 721 Parsing_Main_Extended_Source := Save_PMES; 722 723 Multiple_Unit_Index := Save_Index; 724 Set_Loading (Unum, False); 725 end; 726 727 -- If spec is irrelevant, then post errors and quit 728 729 if Corr_Body /= No_Unit 730 and then Spec_Is_Irrelevant (Unum, Corr_Body) 731 then 732 Error_Msg_File_1 := Unit_File_Name (Corr_Body); 733 Error_Msg 734 ("cannot compile subprogram in file {!", Load_Msg_Sloc); 735 Error_Msg_File_1 := Unit_File_Name (Unum); 736 Error_Msg 737 ("\incorrect spec in file { must be removed first!", 738 Load_Msg_Sloc); 739 Unum := No_Unit; 740 goto Done; 741 end if; 742 743 -- If loaded unit had a fatal error, then caller inherits it 744 745 if Units.Table (Unum).Fatal_Error 746 and then Present (Error_Node) 747 then 748 Units.Table (Calling_Unit).Fatal_Error := True; 749 end if; 750 751 -- Remove load stack entry and return the entry in the file table 752 753 Load_Stack.Decrement_Last; 754 755 -- All done, return unit number 756 757 goto Done; 758 759 -- Case of file not found 760 761 else 762 if Debug_Flag_L then 763 Write_Str (" file was not found, load failed"); 764 Write_Eol; 765 end if; 766 767 -- Generate message if unit required 768 769 if Required and then Present (Error_Node) then 770 if Is_Predefined_File_Name (Fname) then 771 772 -- This is a predefined library unit which is not present 773 -- in the run time. If a predefined unit is not available 774 -- it may very likely be the case that there is also pragma 775 -- Restriction forbidding its usage. This is typically the 776 -- case when building a configurable run time, where the 777 -- usage of certain run-time units is restricted by means 778 -- of both the corresponding pragma Restriction (such as 779 -- No_Calendar), and by not including the unit. Hence, we 780 -- check whether this predefined unit is forbidden, so that 781 -- the message about the restriction violation is generated, 782 -- if needed. 783 784 Check_Restricted_Unit (Load_Name, Error_Node); 785 786 Error_Msg_Unit_1 := Uname_Actual; 787 Error_Msg -- CODEFIX 788 ("$$ is not a predefined library unit", Load_Msg_Sloc); 789 790 else 791 Error_Msg_File_1 := Fname; 792 Error_Msg ("file{ not found", Load_Msg_Sloc); 793 end if; 794 795 Write_Dependency_Chain; 796 797 -- Remove unit from stack, to avoid cascaded errors on 798 -- subsequent missing files. 799 800 Load_Stack.Decrement_Last; 801 Units.Decrement_Last; 802 803 -- If unit not required, remove load stack entry and the junk 804 -- file table entry, and return No_Unit to indicate not found, 805 806 else 807 Load_Stack.Decrement_Last; 808 Units.Decrement_Last; 809 end if; 810 811 Unum := No_Unit; 812 goto Done; 813 end if; 814 end if; 815 816 -- Here to exit, with result in Unum 817 818 <<Done>> 819 Parsing_Main_Extended_Source := Save_PMES; 820 Cunit_Boolean_Restrictions_Restore (Save_Cunit_Restrictions); 821 return Unum; 822 end Load_Unit; 823 824 -------------------------- 825 -- Make_Child_Decl_Unit -- 826 -------------------------- 827 828 procedure Make_Child_Decl_Unit (N : Node_Id) is 829 Unit_Decl : constant Node_Id := Library_Unit (N); 830 831 begin 832 Units.Increment_Last; 833 Units.Table (Units.Last) := Units.Table (Get_Cunit_Unit_Number (N)); 834 Units.Table (Units.Last).Unit_Name := 835 Get_Spec_Name (Unit_Name (Get_Cunit_Unit_Number (N))); 836 Units.Table (Units.Last).Cunit := Unit_Decl; 837 Units.Table (Units.Last).Cunit_Entity := 838 Defining_Identifier 839 (Defining_Unit_Name (Specification (Unit (Unit_Decl)))); 840 841 -- The library unit created for of a child subprogram unit plays no 842 -- role in code generation and binding, so label it accordingly. 843 844 Units.Table (Units.Last).Generate_Code := False; 845 Set_Has_No_Elaboration_Code (Unit_Decl); 846 end Make_Child_Decl_Unit; 847 848 ------------------------ 849 -- Make_Instance_Unit -- 850 ------------------------ 851 852 -- If the unit is an instance, it appears as a package declaration, but 853 -- contains both declaration and body of the instance. The body becomes 854 -- the main unit of the compilation, and the declaration is inserted 855 -- at the end of the unit table. The main unit now has the name of a 856 -- body, which is constructed from the name of the original spec, 857 -- and is attached to the compilation node of the original unit. The 858 -- declaration has been attached to a new compilation unit node, and 859 -- code will have to be generated for it. 860 861 procedure Make_Instance_Unit (N : Node_Id; In_Main : Boolean) is 862 Sind : constant Source_File_Index := Source_Index (Main_Unit); 863 864 begin 865 Units.Increment_Last; 866 867 if In_Main then 868 Units.Table (Units.Last) := Units.Table (Main_Unit); 869 Units.Table (Units.Last).Cunit := Library_Unit (N); 870 Units.Table (Units.Last).Generate_Code := True; 871 Units.Table (Main_Unit).Cunit := N; 872 Units.Table (Main_Unit).Unit_Name := 873 Get_Body_Name 874 (Unit_Name (Get_Cunit_Unit_Number (Library_Unit (N)))); 875 Units.Table (Main_Unit).Version := Source_Checksum (Sind); 876 877 else 878 -- Duplicate information from instance unit, for the body. The unit 879 -- node N has been rewritten as a body, but it was placed in the 880 -- units table when first loaded as a declaration. 881 882 Units.Table (Units.Last) := Units.Table (Get_Cunit_Unit_Number (N)); 883 Units.Table (Units.Last).Cunit := Library_Unit (N); 884 end if; 885 end Make_Instance_Unit; 886 887 ------------------------ 888 -- Spec_Is_Irrelevant -- 889 ------------------------ 890 891 function Spec_Is_Irrelevant 892 (Spec_Unit : Unit_Number_Type; 893 Body_Unit : Unit_Number_Type) return Boolean 894 is 895 Sunit : constant Node_Id := Cunit (Spec_Unit); 896 Bunit : constant Node_Id := Cunit (Body_Unit); 897 898 begin 899 -- The spec is irrelevant if the body is a subprogram body, and the spec 900 -- is other than a subprogram spec or generic subprogram spec. Note that 901 -- the names must be the same, we don't need to check that, because we 902 -- already know that from the fact that the file names are the same. 903 904 return 905 Nkind (Unit (Bunit)) = N_Subprogram_Body 906 and then Nkind (Unit (Sunit)) /= N_Subprogram_Declaration 907 and then Nkind (Unit (Sunit)) /= N_Generic_Subprogram_Declaration; 908 end Spec_Is_Irrelevant; 909 910 -------------------- 911 -- Version_Update -- 912 -------------------- 913 914 procedure Version_Update (U : Node_Id; From : Node_Id) is 915 Unum : constant Unit_Number_Type := Get_Cunit_Unit_Number (U); 916 Fnum : constant Unit_Number_Type := Get_Cunit_Unit_Number (From); 917 begin 918 if Source_Index (Fnum) /= No_Source_File then 919 Units.Table (Unum).Version := 920 Units.Table (Unum).Version 921 xor 922 Source_Checksum (Source_Index (Fnum)); 923 end if; 924 end Version_Update; 925 926 ---------------------------- 927 -- Write_Dependency_Chain -- 928 ---------------------------- 929 930 procedure Write_Dependency_Chain is 931 begin 932 -- The dependency chain is only written if it is at least two entries 933 -- deep, otherwise it is trivial (the main unit depending on a unit 934 -- that it obviously directly depends on). 935 936 if Load_Stack.Last - 1 > Load_Stack.First then 937 for U in Load_Stack.First .. Load_Stack.Last - 1 loop 938 Error_Msg_Unit_1 := 939 Unit_Name (Load_Stack.Table (U).Unit_Number); 940 Error_Msg_Unit_2 := 941 Unit_Name (Load_Stack.Table (U + 1).Unit_Number); 942 Error_Msg ("$ depends on $!", Load_Msg_Sloc); 943 end loop; 944 end if; 945 end Write_Dependency_Chain; 946 947end Lib.Load; 948