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) 1992-2020, 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 Init_Unit_Name (Unum, Spec_Name); 249 250 Set_Comes_From_Source_Default (Save_CS); 251 Set_Error_Posted (Cunit_Entity); 252 Set_Error_Posted (Cunit); 253 return Unum; 254 end Create_Dummy_Package_Unit; 255 256 ----------------------------- 257 -- From_Limited_With_Chain -- 258 ----------------------------- 259 260 function From_Limited_With_Chain return Boolean is 261 Curr_Num : constant Unit_Number_Type := 262 Load_Stack.Table (Load_Stack.Last).Unit_Number; 263 264 begin 265 -- True if the current load operation is through a limited_with clause 266 -- and we are not within a loop of regular with_clauses. 267 268 for U in reverse Load_Stack.First .. Load_Stack.Last - 1 loop 269 if Load_Stack.Table (U).Unit_Number = Curr_Num then 270 return False; 271 272 elsif Present (Load_Stack.Table (U).With_Node) 273 and then Limited_Present (Load_Stack.Table (U).With_Node) 274 then 275 return True; 276 end if; 277 end loop; 278 279 return False; 280 end From_Limited_With_Chain; 281 282 ---------------- 283 -- Initialize -- 284 ---------------- 285 286 procedure Initialize is 287 begin 288 Units.Init; 289 Load_Stack.Init; 290 end Initialize; 291 292 ------------------------ 293 -- Initialize_Version -- 294 ------------------------ 295 296 procedure Initialize_Version (U : Unit_Number_Type) is 297 begin 298 Units.Table (U).Version := Source_Checksum (Source_Index (U)); 299 end Initialize_Version; 300 301 ---------------------- 302 -- Load_Main_Source -- 303 ---------------------- 304 305 procedure Load_Main_Source is 306 Fname : constant File_Name_Type := Next_Main_Source; 307 Pre_Name : constant Boolean := 308 Is_Predefined_File_Name (Fname, Renamings_Included => False); 309 Ren_Name : constant Boolean := 310 Is_Predefined_Renaming_File_Name (Fname); 311 GNAT_Name : constant Boolean := 312 Is_GNAT_File_Name (Fname); 313 Version : Word := 0; 314 315 begin 316 Load_Stack.Increment_Last; 317 Load_Stack.Table (Load_Stack.Last) := (Main_Unit, Empty); 318 319 -- Initialize unit table entry for Main_Unit. Note that we don't know 320 -- the unit name yet, that gets filled in when the parser parses the 321 -- main unit, at which time a check is made that it matches the main 322 -- file name, and then the Unit_Name field is set. The Cunit and 323 -- Cunit_Entity fields also get filled in later by the parser. 324 325 Units.Increment_Last; 326 327 Units.Table (Main_Unit).Unit_File_Name := Fname; 328 329 if Fname /= No_File then 330 Main_Source_File := Load_Source_File (Fname); 331 Current_Error_Source_File := Main_Source_File; 332 333 if Main_Source_File > No_Source_File then 334 Version := Source_Checksum (Main_Source_File); 335 336 else 337 -- To avoid emitting a source location (since there is no file), 338 -- we write a custom error message instead of using the machinery 339 -- in errout.adb. 340 341 Set_Standard_Error; 342 343 if Main_Source_File = No_Access_To_Source_File then 344 Write_Str 345 ("no read access for file """ & Get_Name_String (Fname) 346 & """"); 347 else 348 Write_Str 349 ("file """ & Get_Name_String (Fname) & """ not found"); 350 end if; 351 352 Write_Eol; 353 Set_Standard_Output; 354 end if; 355 356 Units.Table (Main_Unit) := 357 (Cunit => Empty, 358 Cunit_Entity => Empty, 359 Dependency_Num => 0, 360 Dynamic_Elab => False, 361 Error_Location => No_Location, 362 Expected_Unit => No_Unit_Name, 363 Fatal_Error => None, 364 Generate_Code => False, 365 Has_RACW => False, 366 Filler => False, 367 Ident_String => Empty, 368 369 Is_Predefined_Renaming => Ren_Name, 370 Is_Predefined_Unit => Pre_Name or Ren_Name, 371 Is_Internal_Unit => Pre_Name or Ren_Name or GNAT_Name, 372 Filler2 => False, 373 374 Loading => True, 375 Main_Priority => Default_Main_Priority, 376 Main_CPU => Default_Main_CPU, 377 Primary_Stack_Count => 0, 378 Sec_Stack_Count => 0, 379 380 Munit_Index => 0, 381 No_Elab_Code_All => False, 382 Serial_Number => 0, 383 Source_Index => Main_Source_File, 384 Unit_File_Name => Fname, 385 Unit_Name => No_Unit_Name, 386 Version => Version, 387 OA_Setting => 'O'); 388 end if; 389 end Load_Main_Source; 390 391 --------------- 392 -- Load_Unit -- 393 --------------- 394 395 function Load_Unit 396 (Load_Name : Unit_Name_Type; 397 Required : Boolean; 398 Error_Node : Node_Id; 399 Subunit : Boolean; 400 Corr_Body : Unit_Number_Type := No_Unit; 401 Renamings : Boolean := False; 402 With_Node : Node_Id := Empty; 403 PMES : Boolean := False) return Unit_Number_Type 404 is 405 Calling_Unit : Unit_Number_Type; 406 Uname_Actual : Unit_Name_Type; 407 Unum : Unit_Number_Type; 408 Unump : Unit_Number_Type; 409 Fname : File_Name_Type; 410 Pre_Name : Boolean; 411 Ren_Name : Boolean; 412 GNAT_Name : Boolean; 413 Src_Ind : Source_File_Index; 414 Save_PMES : constant Boolean := Parsing_Main_Extended_Source; 415 416 Save_Cunit_Restrictions : constant Save_Cunit_Boolean_Restrictions := 417 Cunit_Boolean_Restrictions_Save; 418 -- Save current restrictions for restore at end 419 420 begin 421 Parsing_Main_Extended_Source := PMES; 422 423 -- Initialize restrictions to config restrictions for unit to load if 424 -- it is part of the main extended source, otherwise reset them. 425 426 -- Note: it's a bit odd but PMES is False for subunits, which is why 427 -- we have the OR here. Should be investigated some time??? 428 429 if PMES or Subunit then 430 Restore_Config_Cunit_Boolean_Restrictions; 431 else 432 Reset_Cunit_Boolean_Restrictions; 433 end if; 434 435 -- If renamings are allowed and we have a child unit name, then we 436 -- must first load the parent to deal with finding the real name. 437 -- Retain the with_clause that names the child, so that if it is 438 -- limited, the parent is loaded under the same condition. 439 440 if Renamings and then Is_Child_Name (Load_Name) then 441 Unump := 442 Load_Unit 443 (Load_Name => Get_Parent_Spec_Name (Load_Name), 444 Required => Required, 445 Subunit => False, 446 Renamings => True, 447 Error_Node => Error_Node, 448 With_Node => With_Node); 449 450 if Unump = No_Unit then 451 Parsing_Main_Extended_Source := Save_PMES; 452 return No_Unit; 453 end if; 454 455 -- If parent is a renaming, then we use the renamed package as 456 -- the actual parent for the subsequent load operation. 457 458 if Nkind (Unit (Cunit (Unump))) = N_Package_Renaming_Declaration then 459 Uname_Actual := 460 New_Child 461 (Load_Name, Get_Unit_Name (Name (Unit (Cunit (Unump))))); 462 463 -- If the load is for a with_clause, for visibility purposes both 464 -- the renamed entity and renaming one must be available in the 465 -- current unit: the renamed one in order to retrieve the child 466 -- unit, and the original one because it may be used as a prefix 467 -- in the body of the current unit. We add an explicit with_clause 468 -- for the original parent so that the renaming declaration is 469 -- properly loaded and analyzed. 470 471 if Present (With_Node) then 472 Insert_After (With_Node, 473 Make_With_Clause (Sloc (With_Node), 474 Name => Copy_Separate_Tree (Prefix (Name (With_Node))))); 475 end if; 476 477 -- Save the renaming entity, to establish its visibility when 478 -- installing the context. The implicit with is on this entity, 479 -- not on the package it renames. This is somewhat redundant given 480 -- the with_clause just created, but it simplifies subsequent 481 -- expansion of the current with_clause. Optimizable ??? 482 483 if Nkind (Error_Node) = N_With_Clause 484 and then Nkind (Name (Error_Node)) = N_Selected_Component 485 then 486 declare 487 Par : Node_Id := Name (Error_Node); 488 489 begin 490 while Nkind (Par) = N_Selected_Component 491 and then Chars (Selector_Name (Par)) /= 492 Chars (Cunit_Entity (Unump)) 493 loop 494 Par := Prefix (Par); 495 end loop; 496 497 -- Case of some intermediate parent is a renaming 498 499 if Nkind (Par) = N_Selected_Component then 500 Set_Entity (Selector_Name (Par), Cunit_Entity (Unump)); 501 502 -- Case where the ultimate parent is a renaming 503 504 else 505 Set_Entity (Par, Cunit_Entity (Unump)); 506 end if; 507 end; 508 end if; 509 510 -- If the parent is not a renaming, then get its name (this may 511 -- be different from the parent spec name obtained above because 512 -- of renamings higher up in the hierarchy). 513 514 else 515 Uname_Actual := New_Child (Load_Name, Unit_Name (Unump)); 516 end if; 517 518 -- Here if unit to be loaded is not a child unit 519 520 else 521 Uname_Actual := Load_Name; 522 end if; 523 524 Fname := Get_File_Name (Uname_Actual, Subunit); 525 Pre_Name := 526 Is_Predefined_File_Name (Fname, Renamings_Included => False); 527 Ren_Name := Is_Predefined_Renaming_File_Name (Fname); 528 GNAT_Name := Is_GNAT_File_Name (Fname); 529 530 if Debug_Flag_L then 531 Write_Eol; 532 Write_Str ("*** Load request for unit: "); 533 Write_Unit_Name (Load_Name); 534 535 if Required then 536 Write_Str (" (Required = True)"); 537 else 538 Write_Str (" (Required = False)"); 539 end if; 540 541 Write_Eol; 542 543 if Uname_Actual /= Load_Name then 544 Write_Str ("*** Actual unit loaded: "); 545 Write_Unit_Name (Uname_Actual); 546 end if; 547 end if; 548 549 -- Capture error location if it is for the main unit. The idea is to 550 -- post errors on the main unit location, not the most recent unit. 551 -- Note: Unit_Name (Main_Unit) is not set if we are parsing gnat.adc. 552 553 if Present (Error_Node) 554 and then Present (Unit_Name (Main_Unit)) 555 then 556 -- It seems like In_Extended_Main_Source_Unit (Error_Node) would 557 -- do the trick here, but that's wrong, it is much too early to 558 -- call this routine. We are still in the parser, and the required 559 -- semantic information is not established yet. So we base the 560 -- judgment on unit names. 561 562 Get_External_Unit_Name_String (Unit_Name (Main_Unit)); 563 564 declare 565 Main_Unit_Name : constant String := Name_Buffer (1 .. Name_Len); 566 567 begin 568 Get_External_Unit_Name_String 569 (Unit_Name (Get_Source_Unit (Error_Node))); 570 571 -- If the two names are identical, then for sure we are part 572 -- of the extended main unit 573 574 if Main_Unit_Name = Name_Buffer (1 .. Name_Len) then 575 Load_Msg_Sloc := Sloc (Error_Node); 576 577 -- If the load is called from a with_type clause, the error 578 -- node is correct. 579 580 -- Otherwise, check for the subunit case, and if so, consider 581 -- we have a match if one name is a prefix of the other name. 582 583 else 584 if Nkind (Unit (Cunit (Main_Unit))) = N_Subunit 585 or else 586 Nkind (Unit (Cunit (Get_Source_Unit (Error_Node)))) = 587 N_Subunit 588 then 589 Name_Len := Integer'Min (Name_Len, Main_Unit_Name'Length); 590 591 if Name_Buffer (1 .. Name_Len) 592 = 593 Main_Unit_Name (1 .. Name_Len) 594 then 595 Load_Msg_Sloc := Sloc (Error_Node); 596 end if; 597 end if; 598 end if; 599 end; 600 end if; 601 602 -- If we are generating error messages, then capture calling unit 603 604 if Present (Error_Node) then 605 Calling_Unit := Get_Source_Unit (Error_Node); 606 else 607 Calling_Unit := No_Unit; 608 end if; 609 610 -- See if we already have an entry for this unit 611 612 Unum := Unit_Names.Get (Uname_Actual); 613 if Unum = No_Unit then 614 Unum := Units.Last + 1; 615 end if; 616 617 -- Whether or not the entry was found, Unum is now the right value, 618 -- since it is one more than Units.Last (i.e. the index of the new 619 -- entry we will create) in the not found case. 620 621 -- A special check is necessary in the unit not found case. If the unit 622 -- is not found, but the file in which it lives has already been loaded, 623 -- then we have the problem that the file does not contain the unit that 624 -- is needed. We simply treat this as a file not found condition. 625 626 -- We skip this test in multiple unit per file mode since in this 627 -- case we can have multiple units from the same source file. 628 629 if Unum > Units.Last and then Get_Unit_Index (Uname_Actual) = 0 then 630 for J in Units.First .. Units.Last loop 631 if Fname = Units.Table (J).Unit_File_Name then 632 if Debug_Flag_L then 633 Write_Str (" file does not contain unit, Unit_Number = "); 634 Write_Int (Int (Unum)); 635 Write_Eol; 636 Write_Eol; 637 end if; 638 639 if Present (Error_Node) then 640 Get_Name_String (Fname); 641 642 if Is_Predefined_File_Name (Fname) then 643 Error_Msg_Unit_1 := Uname_Actual; 644 Error_Msg 645 ("$$ is not a language defined unit", Load_Msg_Sloc); 646 else 647 Error_Msg_File_1 := Fname; 648 Error_Msg_Unit_1 := Uname_Actual; 649 Error_Msg ("file{ does not contain unit$", Load_Msg_Sloc); 650 end if; 651 652 Write_Dependency_Chain; 653 Unum := No_Unit; 654 goto Done; 655 656 else 657 Unum := No_Unit; 658 goto Done; 659 end if; 660 end if; 661 end loop; 662 end if; 663 664 -- If we are proceeding with load, then make load stack entry, 665 -- and indicate the kind of with_clause responsible for the load. 666 667 Load_Stack.Increment_Last; 668 Load_Stack.Table (Load_Stack.Last) := (Unum, With_Node); 669 670 -- Case of entry already in table 671 672 if Unum <= Units.Last then 673 674 -- Here is where we check for a circular dependency, which is 675 -- an attempt to load a unit which is currently in the process 676 -- of being loaded. We do *not* care about a circular chain that 677 -- leads back to a body, because this kind of circular dependence 678 -- legitimately occurs (e.g. two package bodies that contain 679 -- inlined subprogram referenced by the other). 680 681 -- Ada 2005 (AI-50217): We also ignore limited_with clauses, because 682 -- their purpose is precisely to create legal circular structures. 683 684 if Loading (Unum) 685 and then (Is_Spec_Name (Units.Table (Unum).Unit_Name) 686 or else Acts_As_Spec (Units.Table (Unum).Cunit)) 687 and then (Nkind (Error_Node) /= N_With_Clause 688 or else not Limited_Present (Error_Node)) 689 and then not From_Limited_With_Chain 690 then 691 if Debug_Flag_L then 692 Write_Str (" circular dependency encountered"); 693 Write_Eol; 694 end if; 695 696 if Present (Error_Node) then 697 Error_Msg ("circular unit dependency", Load_Msg_Sloc); 698 Write_Dependency_Chain; 699 else 700 Load_Stack.Decrement_Last; 701 end if; 702 703 Unum := No_Unit; 704 goto Done; 705 end if; 706 707 if Debug_Flag_L then 708 Write_Str (" unit already in file table, Unit_Number = "); 709 Write_Int (Int (Unum)); 710 Write_Eol; 711 end if; 712 713 Load_Stack.Decrement_Last; 714 goto Done; 715 716 -- Unit is not already in table, so try to open the file 717 718 else 719 if Debug_Flag_L then 720 Write_Str (" attempt unit load, Unit_Number = "); 721 Write_Int (Int (Unum)); 722 Write_Eol; 723 end if; 724 725 Src_Ind := Load_Source_File (Fname); 726 727 -- Make a partial entry in the file table, used even in the file not 728 -- found case to print the dependency chain including the last entry 729 730 Units.Increment_Last; 731 Init_Unit_Name (Unum, Uname_Actual); 732 733 -- File was found 734 735 if Src_Ind > No_Source_File then 736 Units.Table (Unum) := 737 (Cunit => Empty, 738 Cunit_Entity => Empty, 739 Dependency_Num => 0, 740 Dynamic_Elab => False, 741 Error_Location => Sloc (Error_Node), 742 Expected_Unit => Uname_Actual, 743 Fatal_Error => None, 744 Generate_Code => False, 745 Has_RACW => False, 746 Filler => False, 747 Ident_String => Empty, 748 749 Is_Predefined_Renaming => Ren_Name, 750 Is_Predefined_Unit => Pre_Name or Ren_Name, 751 Is_Internal_Unit => Pre_Name or Ren_Name or GNAT_Name, 752 Filler2 => False, 753 754 Loading => True, 755 Main_Priority => Default_Main_Priority, 756 Main_CPU => Default_Main_CPU, 757 Primary_Stack_Count => 0, 758 Sec_Stack_Count => 0, 759 Munit_Index => 0, 760 No_Elab_Code_All => False, 761 Serial_Number => 0, 762 Source_Index => Src_Ind, 763 Unit_File_Name => Fname, 764 Unit_Name => Uname_Actual, 765 Version => Source_Checksum (Src_Ind), 766 OA_Setting => 'O'); 767 768 -- Parse the new unit 769 770 declare 771 Save_Index : constant Nat := Multiple_Unit_Index; 772 Save_PMES : constant Boolean := Parsing_Main_Extended_Source; 773 774 begin 775 Multiple_Unit_Index := Get_Unit_Index (Uname_Actual); 776 Units.Table (Unum).Munit_Index := Multiple_Unit_Index; 777 Initialize_Scanner (Unum, Source_Index (Unum)); 778 779 if Calling_Unit = Main_Unit and then Subunit then 780 Parsing_Main_Extended_Source := True; 781 end if; 782 783 Discard_List (Par (Configuration_Pragmas => False)); 784 785 Parsing_Main_Extended_Source := Save_PMES; 786 787 Multiple_Unit_Index := Save_Index; 788 Set_Loading (Unum, False); 789 end; 790 791 -- If spec is irrelevant, then post errors and quit 792 793 if Corr_Body /= No_Unit 794 and then Spec_Is_Irrelevant (Unum, Corr_Body) 795 then 796 Error_Msg_File_1 := Unit_File_Name (Corr_Body); 797 Error_Msg 798 ("cannot compile subprogram in file {!", Load_Msg_Sloc); 799 Error_Msg_File_1 := Unit_File_Name (Unum); 800 Error_Msg 801 ("\incorrect spec in file { must be removed first!", 802 Load_Msg_Sloc); 803 Unum := No_Unit; 804 goto Done; 805 end if; 806 807 -- If loaded unit had an error, then caller inherits setting 808 809 if Present (Error_Node) then 810 case Units.Table (Unum).Fatal_Error is 811 812 -- Nothing to do if with'ed unit had no error 813 814 when None => 815 null; 816 817 -- If with'ed unit had a detected fatal error, propagate it 818 819 when Error_Detected => 820 Units.Table (Calling_Unit).Fatal_Error := Error_Detected; 821 822 -- If with'ed unit had an ignored error, then propagate it 823 -- but do not overide an existring setting. 824 825 when Error_Ignored => 826 if Units.Table (Calling_Unit).Fatal_Error = None then 827 Units.Table (Calling_Unit).Fatal_Error := 828 Error_Ignored; 829 end if; 830 end case; 831 end if; 832 833 -- Remove load stack entry and return the entry in the file table 834 835 Load_Stack.Decrement_Last; 836 837 -- All done, return unit number 838 839 goto Done; 840 841 -- Case of file not found 842 843 else 844 if Debug_Flag_L then 845 if Src_Ind = No_Access_To_Source_File then 846 Write_Str (" no read access to file, load failed"); 847 else 848 Write_Str (" file was not found, load failed"); 849 end if; 850 851 Write_Eol; 852 end if; 853 854 -- Generate message if unit required 855 856 if Required then 857 Get_Name_String (Fname); 858 859 if Is_Predefined_File_Name (Fname) then 860 861 -- This is a predefined library unit which is not present 862 -- in the run time. If a predefined unit is not available 863 -- it may very likely be the case that there is also pragma 864 -- Restriction forbidding its usage. This is typically the 865 -- case when building a configurable run time, where the 866 -- usage of certain run-time units is restricted by means 867 -- of both the corresponding pragma Restriction (such as 868 -- No_Calendar), and by not including the unit. Hence, we 869 -- check whether this predefined unit is forbidden, so that 870 -- the message about the restriction violation is generated, 871 -- if needed. 872 873 if Present (Error_Node) then 874 Check_Restricted_Unit (Load_Name, Error_Node); 875 end if; 876 877 Error_Msg_Unit_1 := Uname_Actual; 878 Error_Msg -- CODEFIX 879 ("$$ is not a predefined library unit", Load_Msg_Sloc); 880 881 else 882 Error_Msg_File_1 := Fname; 883 884 if Src_Ind = No_Access_To_Source_File then 885 Error_Msg ("no read access to file{", Load_Msg_Sloc); 886 else 887 Error_Msg ("file{ not found", Load_Msg_Sloc); 888 end if; 889 end if; 890 891 Write_Dependency_Chain; 892 893 -- Remove unit from stack, to avoid cascaded errors on 894 -- subsequent missing files. 895 896 Load_Stack.Decrement_Last; 897 Remove_Unit (Unum); 898 899 -- If unit not required, remove load stack entry and the junk 900 -- file table entry, and return No_Unit to indicate not found, 901 902 else 903 Load_Stack.Decrement_Last; 904 Remove_Unit (Unum); 905 end if; 906 907 Unum := No_Unit; 908 goto Done; 909 end if; 910 end if; 911 912 -- Here to exit, with result in Unum 913 914 <<Done>> 915 Parsing_Main_Extended_Source := Save_PMES; 916 Cunit_Boolean_Restrictions_Restore (Save_Cunit_Restrictions); 917 return Unum; 918 end Load_Unit; 919 920 -------------------------- 921 -- Make_Child_Decl_Unit -- 922 -------------------------- 923 924 procedure Make_Child_Decl_Unit (N : Node_Id) is 925 Unit_Decl : constant Node_Id := Library_Unit (N); 926 Unit_Num : constant Unit_Number_Type := Get_Cunit_Unit_Number (N); 927 928 begin 929 Units.Increment_Last; 930 Units.Table (Units.Last) := Units.Table (Unit_Num); 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 Init_Unit_Name (Units.Last, Get_Spec_Name (Unit_Name (Unit_Num))); 936 937 -- The library unit created for of a child subprogram unit plays no 938 -- role in code generation and binding, so label it accordingly. 939 940 Units.Table (Units.Last).Generate_Code := False; 941 Set_Has_No_Elaboration_Code (Unit_Decl); 942 end Make_Child_Decl_Unit; 943 944 ------------------------ 945 -- Make_Instance_Unit -- 946 ------------------------ 947 948 -- If the unit is an instance, it appears as a package declaration, but 949 -- contains both declaration and body of the instance. The body becomes 950 -- the main unit of the compilation, and the declaration is inserted 951 -- at the end of the unit table. The main unit now has the name of a 952 -- body, which is constructed from the name of the original spec, 953 -- and is attached to the compilation node of the original unit. The 954 -- declaration has been attached to a new compilation unit node, and 955 -- code will have to be generated for it. 956 957 procedure Make_Instance_Unit (N : Node_Id; In_Main : Boolean) is 958 Sind : constant Source_File_Index := Source_Index (Main_Unit); 959 960 begin 961 Units.Increment_Last; 962 963 if In_Main then 964 Units.Table (Units.Last) := Units.Table (Main_Unit); 965 Units.Table (Units.Last).Cunit := Library_Unit (N); 966 Units.Table (Units.Last).Generate_Code := True; 967 Init_Unit_Name (Units.Last, Unit_Name (Main_Unit)); 968 969 Units.Table (Main_Unit).Cunit := N; 970 Units.Table (Main_Unit).Version := Source_Checksum (Sind); 971 Init_Unit_Name (Main_Unit, 972 Get_Body_Name 973 (Unit_Name (Get_Cunit_Unit_Number (Library_Unit (N))))); 974 975 else 976 -- Duplicate information from instance unit, for the body. The unit 977 -- node N has been rewritten as a body, but it was placed in the 978 -- units table when first loaded as a declaration. 979 980 Units.Table (Units.Last) := Units.Table (Get_Cunit_Unit_Number (N)); 981 Units.Table (Units.Last).Cunit := Library_Unit (N); 982 end if; 983 end Make_Instance_Unit; 984 985 ------------------------ 986 -- Spec_Is_Irrelevant -- 987 ------------------------ 988 989 function Spec_Is_Irrelevant 990 (Spec_Unit : Unit_Number_Type; 991 Body_Unit : Unit_Number_Type) return Boolean 992 is 993 Sunit : constant Node_Id := Cunit (Spec_Unit); 994 Bunit : constant Node_Id := Cunit (Body_Unit); 995 996 begin 997 -- The spec is irrelevant if the body is a subprogram body, and the spec 998 -- is other than a subprogram spec or generic subprogram spec. Note that 999 -- the names must be the same, we don't need to check that, because we 1000 -- already know that from the fact that the file names are the same. 1001 1002 return 1003 Nkind (Unit (Bunit)) = N_Subprogram_Body 1004 and then Nkind (Unit (Sunit)) /= N_Subprogram_Declaration 1005 and then Nkind (Unit (Sunit)) /= N_Generic_Subprogram_Declaration; 1006 end Spec_Is_Irrelevant; 1007 1008 -------------------- 1009 -- Version_Update -- 1010 -------------------- 1011 1012 procedure Version_Update (U : Node_Id; From : Node_Id) is 1013 Unum : constant Unit_Number_Type := Get_Cunit_Unit_Number (U); 1014 Fnum : constant Unit_Number_Type := Get_Cunit_Unit_Number (From); 1015 begin 1016 if Source_Index (Fnum) > No_Source_File then 1017 Units.Table (Unum).Version := 1018 Units.Table (Unum).Version 1019 xor 1020 Source_Checksum (Source_Index (Fnum)); 1021 end if; 1022 end Version_Update; 1023 1024 ---------------------------- 1025 -- Write_Dependency_Chain -- 1026 ---------------------------- 1027 1028 procedure Write_Dependency_Chain is 1029 begin 1030 -- The dependency chain is only written if it is at least two entries 1031 -- deep, otherwise it is trivial (the main unit depending on a unit 1032 -- that it obviously directly depends on). 1033 1034 if Load_Stack.Last - 1 > Load_Stack.First then 1035 for U in Load_Stack.First .. Load_Stack.Last - 1 loop 1036 Error_Msg_Unit_1 := 1037 Unit_Name (Load_Stack.Table (U).Unit_Number); 1038 Error_Msg_Unit_2 := 1039 Unit_Name (Load_Stack.Table (U + 1).Unit_Number); 1040 Error_Msg ("$ depends on $!", Load_Msg_Sloc); 1041 end loop; 1042 end if; 1043 end Write_Dependency_Chain; 1044 1045end Lib.Load; 1046