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) 1992-2019, 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 Fname : constant File_Name_Type := 149 Get_File_Name (Spec_Name, Subunit => False); 150 Pre_Name : constant Boolean := 151 Is_Predefined_File_Name (Fname, Renamings_Included => False); 152 Ren_Name : constant Boolean := 153 Is_Predefined_Renaming_File_Name (Fname); 154 GNAT_Name : constant Boolean := 155 Is_GNAT_File_Name (Fname); 156 Save_CS : constant Boolean := Get_Comes_From_Source_Default; 157 158 begin 159 -- The created dummy package unit does not come from source 160 161 Set_Comes_From_Source_Default (False); 162 163 -- Normal package 164 165 if Nkind (Name (With_Node)) = N_Identifier then 166 Cunit_Entity := 167 Make_Defining_Identifier (No_Location, 168 Chars => Chars (Name (With_Node))); 169 Du_Name := Cunit_Entity; 170 End_Lab := New_Occurrence_Of (Cunit_Entity, No_Location); 171 172 -- Child package 173 174 else 175 Cunit_Entity := 176 Make_Defining_Identifier (No_Location, 177 Chars => Chars (Selector_Name (Name (With_Node)))); 178 Du_Name := 179 Make_Defining_Program_Unit_Name (No_Location, 180 Name => Copy_Separate_Tree (Prefix (Name (With_Node))), 181 Defining_Identifier => Cunit_Entity); 182 183 Set_Is_Child_Unit (Cunit_Entity); 184 185 End_Lab := 186 Make_Designator (No_Location, 187 Name => Copy_Separate_Tree (Prefix (Name (With_Node))), 188 Identifier => New_Occurrence_Of (Cunit_Entity, No_Location)); 189 end if; 190 191 Set_Scope (Cunit_Entity, Standard_Standard); 192 193 Cunit := 194 Make_Compilation_Unit (No_Location, 195 Context_Items => Empty_List, 196 Unit => 197 Make_Package_Declaration (No_Location, 198 Specification => 199 Make_Package_Specification (No_Location, 200 Defining_Unit_Name => Du_Name, 201 Visible_Declarations => Empty_List, 202 End_Label => End_Lab)), 203 Aux_Decls_Node => 204 Make_Compilation_Unit_Aux (No_Location)); 205 206 -- Mark the dummy package as analyzed to prevent analysis of this 207 -- (non-existent) unit in -gnatQ mode because at the moment the 208 -- structure and attributes of this dummy package does not allow 209 -- a normal analysis of this unit 210 211 Set_Analyzed (Cunit); 212 213 Units.Increment_Last; 214 Unum := Units.Last; 215 216 Units.Table (Unum) := 217 (Cunit => Cunit, 218 Cunit_Entity => Cunit_Entity, 219 Dependency_Num => 0, 220 Dynamic_Elab => False, 221 Error_Location => Sloc (With_Node), 222 Expected_Unit => Spec_Name, 223 Fatal_Error => Error_Detected, 224 Generate_Code => False, 225 Has_RACW => False, 226 Filler => False, 227 Ident_String => Empty, 228 229 Is_Predefined_Renaming => Ren_Name, 230 Is_Predefined_Unit => Pre_Name or Ren_Name, 231 Is_Internal_Unit => Pre_Name or Ren_Name or GNAT_Name, 232 Filler2 => False, 233 234 Loading => False, 235 Main_Priority => Default_Main_Priority, 236 Main_CPU => Default_Main_CPU, 237 Primary_Stack_Count => 0, 238 Sec_Stack_Count => 0, 239 Munit_Index => 0, 240 No_Elab_Code_All => False, 241 Serial_Number => 0, 242 Source_Index => No_Source_File, 243 Unit_File_Name => Fname, 244 Unit_Name => Spec_Name, 245 Version => 0, 246 OA_Setting => 'O'); 247 248 Set_Comes_From_Source_Default (Save_CS); 249 Set_Error_Posted (Cunit_Entity); 250 Set_Error_Posted (Cunit); 251 return Unum; 252 end Create_Dummy_Package_Unit; 253 254 ----------------------------- 255 -- From_Limited_With_Chain -- 256 ----------------------------- 257 258 function From_Limited_With_Chain return Boolean is 259 Curr_Num : constant Unit_Number_Type := 260 Load_Stack.Table (Load_Stack.Last).Unit_Number; 261 262 begin 263 -- True if the current load operation is through a limited_with clause 264 -- and we are not within a loop of regular with_clauses. 265 266 for U in reverse Load_Stack.First .. Load_Stack.Last - 1 loop 267 if Load_Stack.Table (U).Unit_Number = Curr_Num then 268 return False; 269 270 elsif Present (Load_Stack.Table (U).With_Node) 271 and then Limited_Present (Load_Stack.Table (U).With_Node) 272 then 273 return True; 274 end if; 275 end loop; 276 277 return False; 278 end From_Limited_With_Chain; 279 280 ---------------- 281 -- Initialize -- 282 ---------------- 283 284 procedure Initialize is 285 begin 286 Units.Init; 287 Load_Stack.Init; 288 end Initialize; 289 290 ------------------------ 291 -- Initialize_Version -- 292 ------------------------ 293 294 procedure Initialize_Version (U : Unit_Number_Type) is 295 begin 296 Units.Table (U).Version := Source_Checksum (Source_Index (U)); 297 end Initialize_Version; 298 299 ---------------------- 300 -- Load_Main_Source -- 301 ---------------------- 302 303 procedure Load_Main_Source is 304 Fname : constant File_Name_Type := Next_Main_Source; 305 Pre_Name : constant Boolean := 306 Is_Predefined_File_Name (Fname, Renamings_Included => False); 307 Ren_Name : constant Boolean := 308 Is_Predefined_Renaming_File_Name (Fname); 309 GNAT_Name : constant Boolean := 310 Is_GNAT_File_Name (Fname); 311 Version : Word := 0; 312 313 begin 314 Load_Stack.Increment_Last; 315 Load_Stack.Table (Load_Stack.Last) := (Main_Unit, Empty); 316 317 -- Initialize unit table entry for Main_Unit. Note that we don't know 318 -- the unit name yet, that gets filled in when the parser parses the 319 -- main unit, at which time a check is made that it matches the main 320 -- file name, and then the Unit_Name field is set. The Cunit and 321 -- Cunit_Entity fields also get filled in later by the parser. 322 323 Units.Increment_Last; 324 325 Units.Table (Main_Unit).Unit_File_Name := Fname; 326 327 if Fname /= No_File then 328 Main_Source_File := Load_Source_File (Fname); 329 Current_Error_Source_File := Main_Source_File; 330 331 if Main_Source_File > No_Source_File then 332 Version := Source_Checksum (Main_Source_File); 333 334 else 335 -- To avoid emitting a source location (since there is no file), 336 -- we write a custom error message instead of using the machinery 337 -- in errout.adb. 338 339 Set_Standard_Error; 340 341 if Main_Source_File = No_Access_To_Source_File then 342 Write_Str 343 ("no read access for file """ & Get_Name_String (Fname) 344 & """"); 345 else 346 Write_Str 347 ("file """ & Get_Name_String (Fname) & """ not found"); 348 end if; 349 350 Write_Eol; 351 Set_Standard_Output; 352 end if; 353 354 Units.Table (Main_Unit) := 355 (Cunit => Empty, 356 Cunit_Entity => Empty, 357 Dependency_Num => 0, 358 Dynamic_Elab => False, 359 Error_Location => No_Location, 360 Expected_Unit => No_Unit_Name, 361 Fatal_Error => None, 362 Generate_Code => False, 363 Has_RACW => False, 364 Filler => False, 365 Ident_String => Empty, 366 367 Is_Predefined_Renaming => Ren_Name, 368 Is_Predefined_Unit => Pre_Name or Ren_Name, 369 Is_Internal_Unit => Pre_Name or Ren_Name or GNAT_Name, 370 Filler2 => False, 371 372 Loading => True, 373 Main_Priority => Default_Main_Priority, 374 Main_CPU => Default_Main_CPU, 375 Primary_Stack_Count => 0, 376 Sec_Stack_Count => 0, 377 378 Munit_Index => 0, 379 No_Elab_Code_All => False, 380 Serial_Number => 0, 381 Source_Index => Main_Source_File, 382 Unit_File_Name => Fname, 383 Unit_Name => No_Unit_Name, 384 Version => Version, 385 OA_Setting => 'O'); 386 end if; 387 end Load_Main_Source; 388 389 --------------- 390 -- Load_Unit -- 391 --------------- 392 393 function Load_Unit 394 (Load_Name : Unit_Name_Type; 395 Required : Boolean; 396 Error_Node : Node_Id; 397 Subunit : Boolean; 398 Corr_Body : Unit_Number_Type := No_Unit; 399 Renamings : Boolean := False; 400 With_Node : Node_Id := Empty; 401 PMES : Boolean := False) return Unit_Number_Type 402 is 403 Calling_Unit : Unit_Number_Type; 404 Uname_Actual : Unit_Name_Type; 405 Unum : Unit_Number_Type; 406 Unump : Unit_Number_Type; 407 Fname : File_Name_Type; 408 Pre_Name : Boolean; 409 Ren_Name : Boolean; 410 GNAT_Name : Boolean; 411 Src_Ind : Source_File_Index; 412 Save_PMES : constant Boolean := Parsing_Main_Extended_Source; 413 414 Save_Cunit_Restrictions : constant Save_Cunit_Boolean_Restrictions := 415 Cunit_Boolean_Restrictions_Save; 416 -- Save current restrictions for restore at end 417 418 begin 419 Parsing_Main_Extended_Source := PMES; 420 421 -- Initialize restrictions to config restrictions for unit to load if 422 -- it is part of the main extended source, otherwise reset them. 423 424 -- Note: it's a bit odd but PMES is False for subunits, which is why 425 -- we have the OR here. Should be investigated some time??? 426 427 if PMES or Subunit then 428 Restore_Config_Cunit_Boolean_Restrictions; 429 else 430 Reset_Cunit_Boolean_Restrictions; 431 end if; 432 433 -- If renamings are allowed and we have a child unit name, then we 434 -- must first load the parent to deal with finding the real name. 435 -- Retain the with_clause that names the child, so that if it is 436 -- limited, the parent is loaded under the same condition. 437 438 if Renamings and then Is_Child_Name (Load_Name) then 439 Unump := 440 Load_Unit 441 (Load_Name => Get_Parent_Spec_Name (Load_Name), 442 Required => Required, 443 Subunit => False, 444 Renamings => True, 445 Error_Node => Error_Node, 446 With_Node => With_Node); 447 448 if Unump = No_Unit then 449 Parsing_Main_Extended_Source := Save_PMES; 450 return No_Unit; 451 end if; 452 453 -- If parent is a renaming, then we use the renamed package as 454 -- the actual parent for the subsequent load operation. 455 456 if Nkind (Unit (Cunit (Unump))) = N_Package_Renaming_Declaration then 457 Uname_Actual := 458 New_Child 459 (Load_Name, Get_Unit_Name (Name (Unit (Cunit (Unump))))); 460 461 -- If the load is for a with_clause, for visibility purposes both 462 -- the renamed entity and renaming one must be available in the 463 -- current unit: the renamed one in order to retrieve the child 464 -- unit, and the original one because it may be used as a prefix 465 -- in the body of the current unit. We add an explicit with_clause 466 -- for the original parent so that the renaming declaration is 467 -- properly loaded and analyzed. 468 469 if Present (With_Node) then 470 Insert_After (With_Node, 471 Make_With_Clause (Sloc (With_Node), 472 Name => Copy_Separate_Tree (Prefix (Name (With_Node))))); 473 end if; 474 475 -- Save the renaming entity, to establish its visibility when 476 -- installing the context. The implicit with is on this entity, 477 -- not on the package it renames. This is somewhat redundant given 478 -- the with_clause just created, but it simplifies subsequent 479 -- expansion of the current with_clause. Optimizable ??? 480 481 if Nkind (Error_Node) = N_With_Clause 482 and then Nkind (Name (Error_Node)) = N_Selected_Component 483 then 484 declare 485 Par : Node_Id := Name (Error_Node); 486 487 begin 488 while Nkind (Par) = N_Selected_Component 489 and then Chars (Selector_Name (Par)) /= 490 Chars (Cunit_Entity (Unump)) 491 loop 492 Par := Prefix (Par); 493 end loop; 494 495 -- Case of some intermediate parent is a renaming 496 497 if Nkind (Par) = N_Selected_Component then 498 Set_Entity (Selector_Name (Par), Cunit_Entity (Unump)); 499 500 -- Case where the ultimate parent is a renaming 501 502 else 503 Set_Entity (Par, Cunit_Entity (Unump)); 504 end if; 505 end; 506 end if; 507 508 -- If the parent is not a renaming, then get its name (this may 509 -- be different from the parent spec name obtained above because 510 -- of renamings higher up in the hierarchy). 511 512 else 513 Uname_Actual := New_Child (Load_Name, Unit_Name (Unump)); 514 end if; 515 516 -- Here if unit to be loaded is not a child unit 517 518 else 519 Uname_Actual := Load_Name; 520 end if; 521 522 Fname := Get_File_Name (Uname_Actual, Subunit); 523 Pre_Name := 524 Is_Predefined_File_Name (Fname, Renamings_Included => False); 525 Ren_Name := Is_Predefined_Renaming_File_Name (Fname); 526 GNAT_Name := Is_GNAT_File_Name (Fname); 527 528 if Debug_Flag_L then 529 Write_Eol; 530 Write_Str ("*** Load request for unit: "); 531 Write_Unit_Name (Load_Name); 532 533 if Required then 534 Write_Str (" (Required = True)"); 535 else 536 Write_Str (" (Required = False)"); 537 end if; 538 539 Write_Eol; 540 541 if Uname_Actual /= Load_Name then 542 Write_Str ("*** Actual unit loaded: "); 543 Write_Unit_Name (Uname_Actual); 544 end if; 545 end if; 546 547 -- Capture error location if it is for the main unit. The idea is to 548 -- post errors on the main unit location, not the most recent unit. 549 -- Note: Unit_Name (Main_Unit) is not set if we are parsing gnat.adc. 550 551 if Present (Error_Node) 552 and then Unit_Name (Main_Unit) /= No_Unit_Name 553 then 554 -- It seems like In_Extended_Main_Source_Unit (Error_Node) would 555 -- do the trick here, but that's wrong, it is much too early to 556 -- call this routine. We are still in the parser, and the required 557 -- semantic information is not established yet. So we base the 558 -- judgment on unit names. 559 560 Get_External_Unit_Name_String (Unit_Name (Main_Unit)); 561 562 declare 563 Main_Unit_Name : constant String := Name_Buffer (1 .. Name_Len); 564 565 begin 566 Get_External_Unit_Name_String 567 (Unit_Name (Get_Source_Unit (Error_Node))); 568 569 -- If the two names are identical, then for sure we are part 570 -- of the extended main unit 571 572 if Main_Unit_Name = Name_Buffer (1 .. Name_Len) then 573 Load_Msg_Sloc := Sloc (Error_Node); 574 575 -- If the load is called from a with_type clause, the error 576 -- node is correct. 577 578 -- Otherwise, check for the subunit case, and if so, consider 579 -- we have a match if one name is a prefix of the other name. 580 581 else 582 if Nkind (Unit (Cunit (Main_Unit))) = N_Subunit 583 or else 584 Nkind (Unit (Cunit (Get_Source_Unit (Error_Node)))) = 585 N_Subunit 586 then 587 Name_Len := Integer'Min (Name_Len, Main_Unit_Name'Length); 588 589 if Name_Buffer (1 .. Name_Len) 590 = 591 Main_Unit_Name (1 .. Name_Len) 592 then 593 Load_Msg_Sloc := Sloc (Error_Node); 594 end if; 595 end if; 596 end if; 597 end; 598 end if; 599 600 -- If we are generating error messages, then capture calling unit 601 602 if Present (Error_Node) then 603 Calling_Unit := Get_Source_Unit (Error_Node); 604 else 605 Calling_Unit := No_Unit; 606 end if; 607 608 -- See if we already have an entry for this unit 609 610 Unum := Main_Unit; 611 while Unum <= Units.Last loop 612 exit when Uname_Actual = Units.Table (Unum).Unit_Name; 613 Unum := Unum + 1; 614 end loop; 615 616 -- Whether or not the entry was found, Unum is now the right value, 617 -- since it is one more than Units.Last (i.e. the index of the new 618 -- entry we will create) in the not found case. 619 620 -- A special check is necessary in the unit not found case. If the unit 621 -- is not found, but the file in which it lives has already been loaded, 622 -- then we have the problem that the file does not contain the unit that 623 -- is needed. We simply treat this as a file not found condition. 624 625 -- We skip this test in multiple unit per file mode since in this 626 -- case we can have multiple units from the same source file. 627 628 if Unum > Units.Last and then Get_Unit_Index (Uname_Actual) = 0 then 629 for J in Units.First .. Units.Last loop 630 if Fname = Units.Table (J).Unit_File_Name then 631 if Debug_Flag_L then 632 Write_Str (" file does not contain unit, Unit_Number = "); 633 Write_Int (Int (Unum)); 634 Write_Eol; 635 Write_Eol; 636 end if; 637 638 if Present (Error_Node) then 639 Get_Name_String (Fname); 640 641 if Is_Predefined_File_Name (Fname) then 642 Error_Msg_Unit_1 := Uname_Actual; 643 Error_Msg 644 ("$$ is not a language defined unit", Load_Msg_Sloc); 645 else 646 Error_Msg_File_1 := Fname; 647 Error_Msg_Unit_1 := Uname_Actual; 648 Error_Msg ("File{ does not contain unit$", Load_Msg_Sloc); 649 end if; 650 651 Write_Dependency_Chain; 652 Unum := No_Unit; 653 goto Done; 654 655 else 656 Unum := No_Unit; 657 goto Done; 658 end if; 659 end if; 660 end loop; 661 end if; 662 663 -- If we are proceeding with load, then make load stack entry, 664 -- and indicate the kind of with_clause responsible for the load. 665 666 Load_Stack.Increment_Last; 667 Load_Stack.Table (Load_Stack.Last) := (Unum, With_Node); 668 669 -- Case of entry already in table 670 671 if Unum <= Units.Last then 672 673 -- Here is where we check for a circular dependency, which is 674 -- an attempt to load a unit which is currently in the process 675 -- of being loaded. We do *not* care about a circular chain that 676 -- leads back to a body, because this kind of circular dependence 677 -- legitimately occurs (e.g. two package bodies that contain 678 -- inlined subprogram referenced by the other). 679 680 -- Ada 2005 (AI-50217): We also ignore limited_with clauses, because 681 -- their purpose is precisely to create legal circular structures. 682 683 if Loading (Unum) 684 and then (Is_Spec_Name (Units.Table (Unum).Unit_Name) 685 or else Acts_As_Spec (Units.Table (Unum).Cunit)) 686 and then (Nkind (Error_Node) /= N_With_Clause 687 or else not Limited_Present (Error_Node)) 688 and then not From_Limited_With_Chain 689 then 690 if Debug_Flag_L then 691 Write_Str (" circular dependency encountered"); 692 Write_Eol; 693 end if; 694 695 if Present (Error_Node) then 696 Error_Msg ("circular unit dependency", Load_Msg_Sloc); 697 Write_Dependency_Chain; 698 else 699 Load_Stack.Decrement_Last; 700 end if; 701 702 Unum := No_Unit; 703 goto Done; 704 end if; 705 706 if Debug_Flag_L then 707 Write_Str (" unit already in file table, Unit_Number = "); 708 Write_Int (Int (Unum)); 709 Write_Eol; 710 end if; 711 712 Load_Stack.Decrement_Last; 713 goto Done; 714 715 -- Unit is not already in table, so try to open the file 716 717 else 718 if Debug_Flag_L then 719 Write_Str (" attempt unit load, Unit_Number = "); 720 Write_Int (Int (Unum)); 721 Write_Eol; 722 end if; 723 724 Src_Ind := Load_Source_File (Fname); 725 726 -- Make a partial entry in the file table, used even in the file not 727 -- found case to print the dependency chain including the last entry 728 729 Units.Increment_Last; 730 Units.Table (Unum).Unit_Name := Uname_Actual; 731 732 -- File was found 733 734 if Src_Ind > No_Source_File then 735 Units.Table (Unum) := 736 (Cunit => Empty, 737 Cunit_Entity => Empty, 738 Dependency_Num => 0, 739 Dynamic_Elab => False, 740 Error_Location => Sloc (Error_Node), 741 Expected_Unit => Uname_Actual, 742 Fatal_Error => None, 743 Generate_Code => False, 744 Has_RACW => False, 745 Filler => False, 746 Ident_String => Empty, 747 748 Is_Predefined_Renaming => Ren_Name, 749 Is_Predefined_Unit => Pre_Name or Ren_Name, 750 Is_Internal_Unit => Pre_Name or Ren_Name or GNAT_Name, 751 Filler2 => False, 752 753 Loading => True, 754 Main_Priority => Default_Main_Priority, 755 Main_CPU => Default_Main_CPU, 756 Primary_Stack_Count => 0, 757 Sec_Stack_Count => 0, 758 Munit_Index => 0, 759 No_Elab_Code_All => False, 760 Serial_Number => 0, 761 Source_Index => Src_Ind, 762 Unit_File_Name => Fname, 763 Unit_Name => Uname_Actual, 764 Version => Source_Checksum (Src_Ind), 765 OA_Setting => 'O'); 766 767 -- Parse the new unit 768 769 declare 770 Save_Index : constant Nat := Multiple_Unit_Index; 771 Save_PMES : constant Boolean := Parsing_Main_Extended_Source; 772 773 begin 774 Multiple_Unit_Index := Get_Unit_Index (Uname_Actual); 775 Units.Table (Unum).Munit_Index := Multiple_Unit_Index; 776 Initialize_Scanner (Unum, Source_Index (Unum)); 777 778 if Calling_Unit = Main_Unit and then Subunit then 779 Parsing_Main_Extended_Source := True; 780 end if; 781 782 Discard_List (Par (Configuration_Pragmas => False)); 783 784 Parsing_Main_Extended_Source := Save_PMES; 785 786 Multiple_Unit_Index := Save_Index; 787 Set_Loading (Unum, False); 788 end; 789 790 -- If spec is irrelevant, then post errors and quit 791 792 if Corr_Body /= No_Unit 793 and then Spec_Is_Irrelevant (Unum, Corr_Body) 794 then 795 Error_Msg_File_1 := Unit_File_Name (Corr_Body); 796 Error_Msg 797 ("cannot compile subprogram in file {!", Load_Msg_Sloc); 798 Error_Msg_File_1 := Unit_File_Name (Unum); 799 Error_Msg 800 ("\incorrect spec in file { must be removed first!", 801 Load_Msg_Sloc); 802 Unum := No_Unit; 803 goto Done; 804 end if; 805 806 -- If loaded unit had an error, then caller inherits setting 807 808 if Present (Error_Node) then 809 case Units.Table (Unum).Fatal_Error is 810 811 -- Nothing to do if with'ed unit had no error 812 813 when None => 814 null; 815 816 -- If with'ed unit had a detected fatal error, propagate it 817 818 when Error_Detected => 819 Units.Table (Calling_Unit).Fatal_Error := Error_Detected; 820 821 -- If with'ed unit had an ignored error, then propagate it 822 -- but do not overide an existring setting. 823 824 when Error_Ignored => 825 if Units.Table (Calling_Unit).Fatal_Error = None then 826 Units.Table (Calling_Unit).Fatal_Error := 827 Error_Ignored; 828 end if; 829 end case; 830 end if; 831 832 -- Remove load stack entry and return the entry in the file table 833 834 Load_Stack.Decrement_Last; 835 836 -- All done, return unit number 837 838 goto Done; 839 840 -- Case of file not found 841 842 else 843 if Debug_Flag_L then 844 if Src_Ind = No_Access_To_Source_File then 845 Write_Str (" no read access to file, load failed"); 846 else 847 Write_Str (" file was not found, load failed"); 848 end if; 849 850 Write_Eol; 851 end if; 852 853 -- Generate message if unit required 854 855 if Required then 856 Get_Name_String (Fname); 857 858 if Is_Predefined_File_Name (Fname) then 859 860 -- This is a predefined library unit which is not present 861 -- in the run time. If a predefined unit is not available 862 -- it may very likely be the case that there is also pragma 863 -- Restriction forbidding its usage. This is typically the 864 -- case when building a configurable run time, where the 865 -- usage of certain run-time units is restricted by means 866 -- of both the corresponding pragma Restriction (such as 867 -- No_Calendar), and by not including the unit. Hence, we 868 -- check whether this predefined unit is forbidden, so that 869 -- the message about the restriction violation is generated, 870 -- if needed. 871 872 if Present (Error_Node) then 873 Check_Restricted_Unit (Load_Name, Error_Node); 874 end if; 875 876 Error_Msg_Unit_1 := Uname_Actual; 877 Error_Msg -- CODEFIX 878 ("$$ is not a predefined library unit", Load_Msg_Sloc); 879 880 else 881 Error_Msg_File_1 := Fname; 882 883 if Src_Ind = No_Access_To_Source_File then 884 Error_Msg ("no read access to file{", Load_Msg_Sloc); 885 else 886 Error_Msg ("file{ not found", Load_Msg_Sloc); 887 end if; 888 end if; 889 890 Write_Dependency_Chain; 891 892 -- Remove unit from stack, to avoid cascaded errors on 893 -- subsequent missing files. 894 895 Load_Stack.Decrement_Last; 896 Units.Decrement_Last; 897 898 -- If unit not required, remove load stack entry and the junk 899 -- file table entry, and return No_Unit to indicate not found, 900 901 else 902 Load_Stack.Decrement_Last; 903 Units.Decrement_Last; 904 end if; 905 906 Unum := No_Unit; 907 goto Done; 908 end if; 909 end if; 910 911 -- Here to exit, with result in Unum 912 913 <<Done>> 914 Parsing_Main_Extended_Source := Save_PMES; 915 Cunit_Boolean_Restrictions_Restore (Save_Cunit_Restrictions); 916 return Unum; 917 end Load_Unit; 918 919 -------------------------- 920 -- Make_Child_Decl_Unit -- 921 -------------------------- 922 923 procedure Make_Child_Decl_Unit (N : Node_Id) is 924 Unit_Decl : constant Node_Id := Library_Unit (N); 925 926 begin 927 Units.Increment_Last; 928 Units.Table (Units.Last) := Units.Table (Get_Cunit_Unit_Number (N)); 929 Units.Table (Units.Last).Unit_Name := 930 Get_Spec_Name (Unit_Name (Get_Cunit_Unit_Number (N))); 931 Units.Table (Units.Last).Cunit := Unit_Decl; 932 Units.Table (Units.Last).Cunit_Entity := 933 Defining_Identifier 934 (Defining_Unit_Name (Specification (Unit (Unit_Decl)))); 935 936 -- The library unit created for of a child subprogram unit plays no 937 -- role in code generation and binding, so label it accordingly. 938 939 Units.Table (Units.Last).Generate_Code := False; 940 Set_Has_No_Elaboration_Code (Unit_Decl); 941 end Make_Child_Decl_Unit; 942 943 ------------------------ 944 -- Make_Instance_Unit -- 945 ------------------------ 946 947 -- If the unit is an instance, it appears as a package declaration, but 948 -- contains both declaration and body of the instance. The body becomes 949 -- the main unit of the compilation, and the declaration is inserted 950 -- at the end of the unit table. The main unit now has the name of a 951 -- body, which is constructed from the name of the original spec, 952 -- and is attached to the compilation node of the original unit. The 953 -- declaration has been attached to a new compilation unit node, and 954 -- code will have to be generated for it. 955 956 procedure Make_Instance_Unit (N : Node_Id; In_Main : Boolean) is 957 Sind : constant Source_File_Index := Source_Index (Main_Unit); 958 959 begin 960 Units.Increment_Last; 961 962 if In_Main then 963 Units.Table (Units.Last) := Units.Table (Main_Unit); 964 Units.Table (Units.Last).Cunit := Library_Unit (N); 965 Units.Table (Units.Last).Generate_Code := True; 966 Units.Table (Main_Unit).Cunit := N; 967 Units.Table (Main_Unit).Unit_Name := 968 Get_Body_Name 969 (Unit_Name (Get_Cunit_Unit_Number (Library_Unit (N)))); 970 Units.Table (Main_Unit).Version := Source_Checksum (Sind); 971 972 else 973 -- Duplicate information from instance unit, for the body. The unit 974 -- node N has been rewritten as a body, but it was placed in the 975 -- units table when first loaded as a declaration. 976 977 Units.Table (Units.Last) := Units.Table (Get_Cunit_Unit_Number (N)); 978 Units.Table (Units.Last).Cunit := Library_Unit (N); 979 end if; 980 end Make_Instance_Unit; 981 982 ------------------------ 983 -- Spec_Is_Irrelevant -- 984 ------------------------ 985 986 function Spec_Is_Irrelevant 987 (Spec_Unit : Unit_Number_Type; 988 Body_Unit : Unit_Number_Type) return Boolean 989 is 990 Sunit : constant Node_Id := Cunit (Spec_Unit); 991 Bunit : constant Node_Id := Cunit (Body_Unit); 992 993 begin 994 -- The spec is irrelevant if the body is a subprogram body, and the spec 995 -- is other than a subprogram spec or generic subprogram spec. Note that 996 -- the names must be the same, we don't need to check that, because we 997 -- already know that from the fact that the file names are the same. 998 999 return 1000 Nkind (Unit (Bunit)) = N_Subprogram_Body 1001 and then Nkind (Unit (Sunit)) /= N_Subprogram_Declaration 1002 and then Nkind (Unit (Sunit)) /= N_Generic_Subprogram_Declaration; 1003 end Spec_Is_Irrelevant; 1004 1005 -------------------- 1006 -- Version_Update -- 1007 -------------------- 1008 1009 procedure Version_Update (U : Node_Id; From : Node_Id) is 1010 Unum : constant Unit_Number_Type := Get_Cunit_Unit_Number (U); 1011 Fnum : constant Unit_Number_Type := Get_Cunit_Unit_Number (From); 1012 begin 1013 if Source_Index (Fnum) > No_Source_File then 1014 Units.Table (Unum).Version := 1015 Units.Table (Unum).Version 1016 xor 1017 Source_Checksum (Source_Index (Fnum)); 1018 end if; 1019 end Version_Update; 1020 1021 ---------------------------- 1022 -- Write_Dependency_Chain -- 1023 ---------------------------- 1024 1025 procedure Write_Dependency_Chain is 1026 begin 1027 -- The dependency chain is only written if it is at least two entries 1028 -- deep, otherwise it is trivial (the main unit depending on a unit 1029 -- that it obviously directly depends on). 1030 1031 if Load_Stack.Last - 1 > Load_Stack.First then 1032 for U in Load_Stack.First .. Load_Stack.Last - 1 loop 1033 Error_Msg_Unit_1 := 1034 Unit_Name (Load_Stack.Table (U).Unit_Number); 1035 Error_Msg_Unit_2 := 1036 Unit_Name (Load_Stack.Table (U + 1).Unit_Number); 1037 Error_Msg ("$ depends on $!", Load_Msg_Sloc); 1038 end loop; 1039 end if; 1040 end Write_Dependency_Chain; 1041 1042end Lib.Load; 1043