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) 1992-2021, 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 Einfo.Entities; use Einfo.Entities; 30with Errout; use Errout; 31with Fname; use Fname; 32with Fname.UF; use Fname.UF; 33with Nlists; use Nlists; 34with Nmake; use Nmake; 35with Opt; use Opt; 36with Osint; use Osint; 37with Osint.C; use Osint.C; 38with Output; use Output; 39with Par; 40with Restrict; use Restrict; 41with Scn; use Scn; 42with Sinfo; use Sinfo; 43with Sinfo.Nodes; use Sinfo.Nodes; 44with Sinfo.Utils; use Sinfo.Utils; 45with Sinput; use Sinput; 46with Sinput.L; use Sinput.L; 47with Stand; use Stand; 48with Tbuild; use Tbuild; 49with Uname; use Uname; 50 51package body Lib.Load is 52 53 ----------------------- 54 -- Local Subprograms -- 55 ----------------------- 56 57 function From_Limited_With_Chain return Boolean; 58 -- Check whether a possible circular dependence includes units that 59 -- have been loaded through limited_with clauses, in which case there 60 -- is no real circularity. 61 62 function Spec_Is_Irrelevant 63 (Spec_Unit : Unit_Number_Type; 64 Body_Unit : Unit_Number_Type) return Boolean; 65 -- The Spec_Unit and Body_Unit parameters are the unit numbers of the 66 -- spec file that corresponds to the main unit which is a body. This 67 -- function determines if the spec file is irrelevant and will be 68 -- overridden by the body as described in RM 10.1.4(4). See description 69 -- in "Special Handling of Subprogram Bodies" for further details. 70 71 procedure Write_Dependency_Chain; 72 -- This procedure is used to generate error message info lines that 73 -- trace the current dependency chain when a load error occurs. 74 75 ------------------------------ 76 -- Change_Main_Unit_To_Spec -- 77 ------------------------------ 78 79 procedure Change_Main_Unit_To_Spec is 80 U : Unit_Record renames Units.Table (Main_Unit); 81 N : File_Name_Type; 82 X : Source_File_Index; 83 84 begin 85 -- Get name of unit body 86 87 Get_Name_String (U.Unit_File_Name); 88 89 -- Note: for the following we should really generalize and consult the 90 -- file name pattern data, but for now we just deal with the common 91 -- naming cases, which is good enough in practice. 92 93 -- Change .adb to .ads 94 95 if Name_Len >= 5 96 and then Name_Buffer (Name_Len - 3 .. Name_Len) = ".adb" 97 then 98 Name_Buffer (Name_Len) := 's'; 99 100 -- Change .2.ada to .1.ada (Rational convention) 101 102 elsif Name_Len >= 7 103 and then Name_Buffer (Name_Len - 5 .. Name_Len) = ".2.ada" 104 then 105 Name_Buffer (Name_Len - 4) := '1'; 106 107 -- Change .ada to _.ada (DEC convention) 108 109 elsif Name_Len >= 5 110 and then Name_Buffer (Name_Len - 3 .. Name_Len) = ".ada" 111 then 112 Name_Buffer (Name_Len - 3 .. Name_Len + 1) := "_.ada"; 113 Name_Len := Name_Len + 1; 114 115 -- No match, don't make the change 116 117 else 118 return; 119 end if; 120 121 -- Try loading the spec 122 123 N := Name_Find; 124 X := Load_Source_File (N); 125 126 -- No change if we did not find the spec 127 128 if X <= No_Source_File then 129 return; 130 end if; 131 132 -- Otherwise modify Main_Unit entry to point to spec 133 134 U.Unit_File_Name := N; 135 U.Source_Index := X; 136 end Change_Main_Unit_To_Spec; 137 138 ------------------------------- 139 -- Create_Dummy_Package_Unit -- 140 ------------------------------- 141 142 function Create_Dummy_Package_Unit 143 (With_Node : Node_Id; 144 Spec_Name : Unit_Name_Type) return Unit_Number_Type 145 is 146 Unum : Unit_Number_Type; 147 Cunit_Entity : Entity_Id; 148 Cunit : Node_Id; 149 Du_Name : Node_Or_Entity_Id; 150 End_Lab : Node_Id; 151 Fname : constant File_Name_Type := 152 Get_File_Name (Spec_Name, Subunit => False); 153 Pre_Name : constant Boolean := 154 Is_Predefined_File_Name (Fname, Renamings_Included => False); 155 Ren_Name : constant Boolean := 156 Is_Predefined_Renaming_File_Name (Fname); 157 GNAT_Name : constant Boolean := 158 Is_GNAT_File_Name (Fname); 159 Save_CS : constant Boolean := Get_Comes_From_Source_Default; 160 161 begin 162 -- The created dummy package unit does not come from source 163 164 Set_Comes_From_Source_Default (False); 165 166 -- Normal package 167 168 if Nkind (Name (With_Node)) = N_Identifier then 169 Cunit_Entity := 170 Make_Defining_Identifier (No_Location, 171 Chars => Chars (Name (With_Node))); 172 Du_Name := Cunit_Entity; 173 End_Lab := New_Occurrence_Of (Cunit_Entity, No_Location); 174 175 -- Child package 176 177 else 178 Cunit_Entity := 179 Make_Defining_Identifier (No_Location, 180 Chars => Chars (Selector_Name (Name (With_Node)))); 181 Du_Name := 182 Make_Defining_Program_Unit_Name (No_Location, 183 Name => Copy_Separate_Tree (Prefix (Name (With_Node))), 184 Defining_Identifier => Cunit_Entity); 185 186 Set_Is_Child_Unit (Cunit_Entity); 187 188 End_Lab := 189 Make_Designator (No_Location, 190 Name => Copy_Separate_Tree (Prefix (Name (With_Node))), 191 Identifier => New_Occurrence_Of (Cunit_Entity, No_Location)); 192 end if; 193 194 Set_Scope (Cunit_Entity, Standard_Standard); 195 196 Cunit := 197 Make_Compilation_Unit (No_Location, 198 Context_Items => Empty_List, 199 Unit => 200 Make_Package_Declaration (No_Location, 201 Specification => 202 Make_Package_Specification (No_Location, 203 Defining_Unit_Name => Du_Name, 204 Visible_Declarations => Empty_List, 205 End_Label => End_Lab)), 206 Aux_Decls_Node => 207 Make_Compilation_Unit_Aux (No_Location)); 208 209 -- Mark the dummy package as analyzed to prevent analysis of this 210 -- (non-existent) unit in -gnatQ mode because at the moment the 211 -- structure and attributes of this dummy package does not allow 212 -- a normal analysis of this unit 213 214 Set_Analyzed (Cunit); 215 216 Units.Increment_Last; 217 Unum := Units.Last; 218 219 Units.Table (Unum) := 220 (Cunit => Cunit, 221 Cunit_Entity => Cunit_Entity, 222 Dependency_Num => 0, 223 Dynamic_Elab => False, 224 Error_Location => Sloc (With_Node), 225 Expected_Unit => Spec_Name, 226 Fatal_Error => Error_Detected, 227 Generate_Code => False, 228 Has_RACW => False, 229 Filler => False, 230 Ident_String => Empty, 231 232 Is_Predefined_Renaming => Ren_Name, 233 Is_Predefined_Unit => Pre_Name or Ren_Name, 234 Is_Internal_Unit => Pre_Name or Ren_Name or GNAT_Name, 235 Filler2 => False, 236 237 Loading => False, 238 Main_Priority => Default_Main_Priority, 239 Main_CPU => Default_Main_CPU, 240 Primary_Stack_Count => 0, 241 Sec_Stack_Count => 0, 242 Munit_Index => 0, 243 No_Elab_Code_All => False, 244 Serial_Number => 0, 245 Source_Index => No_Source_File, 246 Unit_File_Name => Fname, 247 Unit_Name => Spec_Name, 248 Version => 0, 249 OA_Setting => 'O'); 250 251 Init_Unit_Name (Unum, Spec_Name); 252 253 Set_Comes_From_Source_Default (Save_CS); 254 Set_Error_Posted (Cunit_Entity); 255 Set_Error_Posted (Cunit); 256 return Unum; 257 end Create_Dummy_Package_Unit; 258 259 ----------------------------- 260 -- From_Limited_With_Chain -- 261 ----------------------------- 262 263 function From_Limited_With_Chain return Boolean is 264 Curr_Num : constant Unit_Number_Type := 265 Load_Stack.Table (Load_Stack.Last).Unit_Number; 266 267 begin 268 -- True if the current load operation is through a limited_with clause 269 -- and we are not within a loop of regular with_clauses. 270 271 for U in reverse Load_Stack.First .. Load_Stack.Last - 1 loop 272 if Load_Stack.Table (U).Unit_Number = Curr_Num then 273 return False; 274 275 elsif Present (Load_Stack.Table (U).With_Node) 276 and then Limited_Present (Load_Stack.Table (U).With_Node) 277 then 278 return True; 279 end if; 280 end loop; 281 282 return False; 283 end From_Limited_With_Chain; 284 285 ---------------- 286 -- Initialize -- 287 ---------------- 288 289 procedure Initialize is 290 begin 291 Units.Init; 292 Load_Stack.Init; 293 end Initialize; 294 295 ------------------------ 296 -- Initialize_Version -- 297 ------------------------ 298 299 procedure Initialize_Version (U : Unit_Number_Type) is 300 begin 301 Units.Table (U).Version := Source_Checksum (Source_Index (U)); 302 end Initialize_Version; 303 304 ---------------------- 305 -- Load_Main_Source -- 306 ---------------------- 307 308 procedure Load_Main_Source is 309 Fname : constant File_Name_Type := Next_Main_Source; 310 Pre_Name : constant Boolean := 311 Is_Predefined_File_Name (Fname, Renamings_Included => False); 312 Ren_Name : constant Boolean := 313 Is_Predefined_Renaming_File_Name (Fname); 314 GNAT_Name : constant Boolean := 315 Is_GNAT_File_Name (Fname); 316 Version : Word := 0; 317 318 begin 319 Load_Stack.Increment_Last; 320 Load_Stack.Table (Load_Stack.Last) := (Main_Unit, Empty); 321 322 -- Initialize unit table entry for Main_Unit. Note that we don't know 323 -- the unit name yet, that gets filled in when the parser parses the 324 -- main unit, at which time a check is made that it matches the main 325 -- file name, and then the Unit_Name field is set. The Cunit and 326 -- Cunit_Entity fields also get filled in later by the parser. 327 328 Units.Increment_Last; 329 330 Units.Table (Main_Unit).Unit_File_Name := Fname; 331 332 if Fname /= No_File then 333 Main_Source_File := Load_Source_File (Fname); 334 Current_Error_Source_File := Main_Source_File; 335 336 if Main_Source_File > No_Source_File then 337 Version := Source_Checksum (Main_Source_File); 338 339 else 340 -- To avoid emitting a source location (since there is no file), 341 -- we write a custom error message instead of using the machinery 342 -- in errout.adb. 343 344 Set_Standard_Error; 345 346 if Main_Source_File = No_Access_To_Source_File then 347 Write_Str 348 ("no read access for file """ & Get_Name_String (Fname) 349 & """"); 350 else 351 Write_Str 352 ("file """ & Get_Name_String (Fname) & """ not found"); 353 end if; 354 355 Write_Eol; 356 Set_Standard_Output; 357 end if; 358 359 Units.Table (Main_Unit) := 360 (Cunit => Empty, 361 Cunit_Entity => Empty, 362 Dependency_Num => 0, 363 Dynamic_Elab => False, 364 Error_Location => No_Location, 365 Expected_Unit => No_Unit_Name, 366 Fatal_Error => None, 367 Generate_Code => True, 368 Has_RACW => False, 369 Filler => False, 370 Ident_String => Empty, 371 372 Is_Predefined_Renaming => Ren_Name, 373 Is_Predefined_Unit => Pre_Name or Ren_Name, 374 Is_Internal_Unit => Pre_Name or Ren_Name or GNAT_Name, 375 Filler2 => False, 376 377 Loading => True, 378 Main_Priority => Default_Main_Priority, 379 Main_CPU => Default_Main_CPU, 380 Primary_Stack_Count => 0, 381 Sec_Stack_Count => 0, 382 383 Munit_Index => 0, 384 No_Elab_Code_All => False, 385 Serial_Number => 0, 386 Source_Index => Main_Source_File, 387 Unit_File_Name => Fname, 388 Unit_Name => No_Unit_Name, 389 Version => Version, 390 OA_Setting => 'O'); 391 end if; 392 end Load_Main_Source; 393 394 --------------- 395 -- Load_Unit -- 396 --------------- 397 398 function Load_Unit 399 (Load_Name : Unit_Name_Type; 400 Required : Boolean; 401 Error_Node : Node_Id; 402 Subunit : Boolean; 403 Corr_Body : Unit_Number_Type := No_Unit; 404 Renamings : Boolean := False; 405 With_Node : Node_Id := Empty; 406 PMES : Boolean := False) return Unit_Number_Type 407 is 408 Calling_Unit : Unit_Number_Type; 409 Uname_Actual : Unit_Name_Type; 410 Unum : Unit_Number_Type; 411 Unump : Unit_Number_Type; 412 Fname : File_Name_Type; 413 Pre_Name : Boolean; 414 Ren_Name : Boolean; 415 GNAT_Name : Boolean; 416 Src_Ind : Source_File_Index; 417 Save_PMES : constant Boolean := Parsing_Main_Extended_Source; 418 419 Save_Cunit_Restrictions : constant Save_Cunit_Boolean_Restrictions := 420 Cunit_Boolean_Restrictions_Save; 421 -- Save current restrictions for restore at end 422 423 begin 424 Parsing_Main_Extended_Source := PMES; 425 426 -- Initialize restrictions to config restrictions for unit to load if 427 -- it is part of the main extended source, otherwise reset them. 428 429 -- Note: it's a bit odd but PMES is False for subunits, which is why 430 -- we have the OR here. 431 432 if PMES or Subunit then 433 Restore_Config_Cunit_Boolean_Restrictions; 434 else 435 Reset_Cunit_Boolean_Restrictions; 436 end if; 437 438 -- If renamings are allowed and we have a child unit name, then we 439 -- must first load the parent to deal with finding the real name. 440 -- Retain the with_clause that names the child, so that if it is 441 -- limited, the parent is loaded under the same condition. 442 443 if Renamings and then Is_Child_Name (Load_Name) then 444 Unump := 445 Load_Unit 446 (Load_Name => Get_Parent_Spec_Name (Load_Name), 447 Required => Required, 448 Subunit => False, 449 Renamings => True, 450 Error_Node => Error_Node, 451 With_Node => With_Node); 452 453 if Unump = No_Unit then 454 Unum := No_Unit; 455 goto Done; 456 end if; 457 458 -- If parent is a renaming, then we use the renamed package as 459 -- the actual parent for the subsequent load operation. 460 461 if Nkind (Unit (Cunit (Unump))) = N_Package_Renaming_Declaration then 462 Uname_Actual := 463 New_Child 464 (Load_Name, Get_Unit_Name (Name (Unit (Cunit (Unump))))); 465 466 -- If the load is for a with_clause, for visibility purposes both 467 -- the renamed entity and renaming one must be available in the 468 -- current unit: the renamed one in order to retrieve the child 469 -- unit, and the original one because it may be used as a prefix 470 -- in the body of the current unit. We add an explicit with_clause 471 -- for the original parent so that the renaming declaration is 472 -- properly loaded and analyzed. 473 474 if Present (With_Node) then 475 Insert_After (With_Node, 476 Make_With_Clause (Sloc (With_Node), 477 Name => Copy_Separate_Tree (Prefix (Name (With_Node))))); 478 end if; 479 480 -- Save the renaming entity, to establish its visibility when 481 -- installing the context. The implicit with is on this entity, 482 -- not on the package it renames. This is somewhat redundant given 483 -- the with_clause just created, but it simplifies subsequent 484 -- expansion of the current with_clause. 485 486 if Nkind (Error_Node) = N_With_Clause 487 and then Nkind (Name (Error_Node)) = N_Selected_Component 488 then 489 declare 490 Par : Node_Id := Name (Error_Node); 491 492 begin 493 while Nkind (Par) = N_Selected_Component 494 and then Chars (Selector_Name (Par)) /= 495 Chars (Cunit_Entity (Unump)) 496 loop 497 Par := Prefix (Par); 498 end loop; 499 500 -- Case of some intermediate parent is a renaming 501 502 if Nkind (Par) = N_Selected_Component then 503 Set_Entity (Selector_Name (Par), Cunit_Entity (Unump)); 504 505 -- Case where the ultimate parent is a renaming 506 507 else 508 Set_Entity (Par, Cunit_Entity (Unump)); 509 end if; 510 end; 511 end if; 512 513 -- If the parent is not a renaming, then get its name (this may 514 -- be different from the parent spec name obtained above because 515 -- of renamings higher up in the hierarchy). 516 517 else 518 Uname_Actual := New_Child (Load_Name, Unit_Name (Unump)); 519 end if; 520 521 -- Here if unit to be loaded is not a child unit 522 523 else 524 Uname_Actual := Load_Name; 525 end if; 526 527 Fname := Get_File_Name (Uname_Actual, Subunit); 528 Pre_Name := 529 Is_Predefined_File_Name (Fname, Renamings_Included => False); 530 Ren_Name := Is_Predefined_Renaming_File_Name (Fname); 531 GNAT_Name := Is_GNAT_File_Name (Fname); 532 533 if Debug_Flag_L then 534 Write_Eol; 535 Write_Str ("*** Load request for unit: "); 536 Write_Unit_Name (Load_Name); 537 538 if Required then 539 Write_Str (" (Required = True)"); 540 else 541 Write_Str (" (Required = False)"); 542 end if; 543 544 Write_Eol; 545 546 if Uname_Actual /= Load_Name then 547 Write_Str ("*** Actual unit loaded: "); 548 Write_Unit_Name (Uname_Actual); 549 end if; 550 end if; 551 552 -- Capture error location if it is for the main unit. The idea is to 553 -- post errors on the main unit location, not the most recent unit. 554 -- Note: Unit_Name (Main_Unit) is not set if we are parsing gnat.adc. 555 556 if Present (Error_Node) 557 and then Present (Unit_Name (Main_Unit)) 558 then 559 -- It seems like In_Extended_Main_Source_Unit (Error_Node) would 560 -- do the trick here, but that's wrong, it is much too early to 561 -- call this routine. We are still in the parser, and the required 562 -- semantic information is not established yet. So we base the 563 -- judgment on unit names. 564 565 Get_External_Unit_Name_String (Unit_Name (Main_Unit)); 566 567 declare 568 Main_Unit_Name : constant String := Name_Buffer (1 .. Name_Len); 569 570 begin 571 Get_External_Unit_Name_String 572 (Unit_Name (Get_Source_Unit (Error_Node))); 573 574 -- If the two names are identical, then for sure we are part 575 -- of the extended main unit 576 577 if Main_Unit_Name = Name_Buffer (1 .. Name_Len) then 578 Load_Msg_Sloc := Sloc (Error_Node); 579 580 -- If the load is called from a with_type clause, the error 581 -- node is correct. 582 583 -- Otherwise, check for the subunit case, and if so, consider 584 -- we have a match if one name is a prefix of the other name. 585 586 else 587 if Nkind (Unit (Cunit (Main_Unit))) = N_Subunit 588 or else 589 Nkind (Unit (Cunit (Get_Source_Unit (Error_Node)))) = 590 N_Subunit 591 then 592 Name_Len := Integer'Min (Name_Len, Main_Unit_Name'Length); 593 594 if Name_Buffer (1 .. Name_Len) 595 = 596 Main_Unit_Name (1 .. Name_Len) 597 then 598 Load_Msg_Sloc := Sloc (Error_Node); 599 end if; 600 end if; 601 end if; 602 end; 603 end if; 604 605 -- If we are generating error messages, then capture calling unit 606 607 if Present (Error_Node) then 608 Calling_Unit := Get_Source_Unit (Error_Node); 609 else 610 Calling_Unit := No_Unit; 611 end if; 612 613 -- See if we already have an entry for this unit 614 615 Unum := Unit_Names.Get (Uname_Actual); 616 if Unum = No_Unit then 617 Unum := Units.Last + 1; 618 end if; 619 620 -- Whether or not the entry was found, Unum is now the right value, 621 -- since it is one more than Units.Last (i.e. the index of the new 622 -- entry we will create) in the not found case. 623 624 -- A special check is necessary in the unit not found case. If the unit 625 -- is not found, but the file in which it lives has already been loaded, 626 -- then we have the problem that the file does not contain the unit that 627 -- is needed. We simply treat this as a file not found condition. 628 629 -- We skip this test in multiple unit per file mode since in this 630 -- case we can have multiple units from the same source file. 631 632 if Unum > Units.Last and then Get_Unit_Index (Uname_Actual) = 0 then 633 for J in Units.First .. Units.Last loop 634 if Fname = Units.Table (J).Unit_File_Name then 635 if Debug_Flag_L then 636 Write_Str (" file does not contain unit, Unit_Number = "); 637 Write_Int (Int (Unum)); 638 Write_Eol; 639 Write_Eol; 640 end if; 641 642 if Present (Error_Node) then 643 Get_Name_String (Fname); 644 645 if Is_Predefined_File_Name (Fname) then 646 Error_Msg_Unit_1 := Uname_Actual; 647 Error_Msg 648 ("$$ is not a language defined unit", Load_Msg_Sloc); 649 else 650 Error_Msg_File_1 := Fname; 651 Error_Msg_Unit_1 := Uname_Actual; 652 Error_Msg ("file{ does not contain unit$", Load_Msg_Sloc); 653 end if; 654 655 Write_Dependency_Chain; 656 Unum := No_Unit; 657 goto Done; 658 659 else 660 Unum := No_Unit; 661 goto Done; 662 end if; 663 end if; 664 end loop; 665 end if; 666 667 -- If we are proceeding with load, then make load stack entry, 668 -- and indicate the kind of with_clause responsible for the load. 669 670 Load_Stack.Increment_Last; 671 Load_Stack.Table (Load_Stack.Last) := (Unum, With_Node); 672 673 -- Case of entry already in table 674 675 if Unum <= Units.Last then 676 677 -- Here is where we check for a circular dependency, which is 678 -- an attempt to load a unit which is currently in the process 679 -- of being loaded. We do *not* care about a circular chain that 680 -- leads back to a body, because this kind of circular dependence 681 -- legitimately occurs (e.g. two package bodies that contain 682 -- inlined subprogram referenced by the other). 683 684 -- Ada 2005 (AI-50217): We also ignore limited_with clauses, because 685 -- their purpose is precisely to create legal circular structures. 686 687 if Loading (Unum) 688 and then (Is_Spec_Name (Units.Table (Unum).Unit_Name) 689 or else Acts_As_Spec (Units.Table (Unum).Cunit)) 690 and then (Nkind (Error_Node) /= N_With_Clause 691 or else not Limited_Present (Error_Node)) 692 and then not From_Limited_With_Chain 693 then 694 if Debug_Flag_L then 695 Write_Str (" circular dependency encountered"); 696 Write_Eol; 697 end if; 698 699 if Present (Error_Node) then 700 Error_Msg ("circular unit dependency", Load_Msg_Sloc); 701 Write_Dependency_Chain; 702 else 703 Load_Stack.Decrement_Last; 704 end if; 705 706 Unum := No_Unit; 707 goto Done; 708 end if; 709 710 if Debug_Flag_L then 711 Write_Str (" unit already in file table, Unit_Number = "); 712 Write_Int (Int (Unum)); 713 Write_Eol; 714 end if; 715 716 Load_Stack.Decrement_Last; 717 goto Done; 718 719 -- Unit is not already in table, so try to open the file 720 721 else 722 if Debug_Flag_L then 723 Write_Str (" attempt unit load, Unit_Number = "); 724 Write_Int (Int (Unum)); 725 Write_Eol; 726 end if; 727 728 Src_Ind := Load_Source_File (Fname); 729 730 -- Make a partial entry in the file table, used even in the file not 731 -- found case to print the dependency chain including the last entry 732 733 Units.Increment_Last; 734 Init_Unit_Name (Unum, Uname_Actual); 735 736 -- File was found 737 738 if Src_Ind > No_Source_File then 739 Units.Table (Unum) := 740 (Cunit => Empty, 741 Cunit_Entity => Empty, 742 Dependency_Num => 0, 743 Dynamic_Elab => False, 744 Error_Location => Sloc (Error_Node), 745 Expected_Unit => Uname_Actual, 746 Fatal_Error => None, 747 Generate_Code => False, 748 Has_RACW => False, 749 Filler => False, 750 Ident_String => Empty, 751 752 Is_Predefined_Renaming => Ren_Name, 753 Is_Predefined_Unit => Pre_Name or Ren_Name, 754 Is_Internal_Unit => Pre_Name or Ren_Name or GNAT_Name, 755 Filler2 => False, 756 757 Loading => True, 758 Main_Priority => Default_Main_Priority, 759 Main_CPU => Default_Main_CPU, 760 Primary_Stack_Count => 0, 761 Sec_Stack_Count => 0, 762 Munit_Index => 0, 763 No_Elab_Code_All => False, 764 Serial_Number => 0, 765 Source_Index => Src_Ind, 766 Unit_File_Name => Fname, 767 Unit_Name => Uname_Actual, 768 Version => Source_Checksum (Src_Ind), 769 OA_Setting => 'O'); 770 771 -- Parse the new unit 772 773 declare 774 Save_Index : constant Nat := Multiple_Unit_Index; 775 Save_PMES : constant Boolean := Parsing_Main_Extended_Source; 776 777 begin 778 Multiple_Unit_Index := Get_Unit_Index (Uname_Actual); 779 Units.Table (Unum).Munit_Index := Multiple_Unit_Index; 780 Initialize_Scanner (Unum, Source_Index (Unum)); 781 782 if Calling_Unit = Main_Unit and then Subunit then 783 Parsing_Main_Extended_Source := True; 784 end if; 785 786 Discard_List (Par (Configuration_Pragmas => False)); 787 788 Parsing_Main_Extended_Source := Save_PMES; 789 790 Multiple_Unit_Index := Save_Index; 791 Set_Loading (Unum, False); 792 end; 793 794 -- If spec is irrelevant, then post errors and quit 795 796 if Corr_Body /= No_Unit 797 and then Spec_Is_Irrelevant (Unum, Corr_Body) 798 then 799 Error_Msg_File_1 := Unit_File_Name (Corr_Body); 800 Error_Msg 801 ("cannot compile subprogram in file {!", Load_Msg_Sloc); 802 Error_Msg_File_1 := Unit_File_Name (Unum); 803 Error_Msg 804 ("\incorrect spec in file { must be removed first!", 805 Load_Msg_Sloc); 806 Unum := No_Unit; 807 goto Done; 808 end if; 809 810 -- If loaded unit had an error, then caller inherits setting 811 812 if Present (Error_Node) then 813 case Units.Table (Unum).Fatal_Error is 814 815 -- Nothing to do if with'ed unit had no error 816 817 when None => 818 null; 819 820 -- If with'ed unit had a detected fatal error, propagate it 821 822 when Error_Detected => 823 Units.Table (Calling_Unit).Fatal_Error := Error_Detected; 824 825 -- If with'ed unit had an ignored error, then propagate it 826 -- but do not overide an existing setting. 827 828 when Error_Ignored => 829 if Units.Table (Calling_Unit).Fatal_Error = None then 830 Units.Table (Calling_Unit).Fatal_Error := 831 Error_Ignored; 832 end if; 833 end case; 834 end if; 835 836 -- Remove load stack entry and return the entry in the file table 837 838 Load_Stack.Decrement_Last; 839 840 -- All done, return unit number 841 842 goto Done; 843 844 -- Case of file not found 845 846 else 847 if Debug_Flag_L then 848 if Src_Ind = No_Access_To_Source_File then 849 Write_Str (" no read access to file, load failed"); 850 else 851 Write_Str (" file was not found, load failed"); 852 end if; 853 854 Write_Eol; 855 end if; 856 857 -- Generate message if unit required 858 859 if Required then 860 Get_Name_String (Fname); 861 862 if Is_Predefined_File_Name (Fname) then 863 864 -- This is a predefined library unit which is not present 865 -- in the run time. If a predefined unit is not available 866 -- it may very likely be the case that there is also pragma 867 -- Restriction forbidding its usage. This is typically the 868 -- case when building a configurable run time, where the 869 -- usage of certain run-time units is restricted by means 870 -- of both the corresponding pragma Restriction (such as 871 -- No_Calendar), and by not including the unit. Hence, we 872 -- check whether this predefined unit is forbidden, so that 873 -- the message about the restriction violation is generated, 874 -- if needed. 875 876 if Present (Error_Node) then 877 Check_Restricted_Unit (Load_Name, Error_Node); 878 end if; 879 880 Error_Msg_Unit_1 := Uname_Actual; 881 Error_Msg -- CODEFIX 882 ("$$ is not a predefined library unit", Load_Msg_Sloc); 883 884 else 885 Error_Msg_File_1 := Fname; 886 887 if Src_Ind = No_Access_To_Source_File then 888 Error_Msg ("no read access to file{", Load_Msg_Sloc); 889 else 890 Error_Msg ("file{ not found", Load_Msg_Sloc); 891 end if; 892 end if; 893 894 Write_Dependency_Chain; 895 896 -- Remove unit from stack, to avoid cascaded errors on 897 -- subsequent missing files. 898 899 Load_Stack.Decrement_Last; 900 Remove_Unit (Unum); 901 902 -- If unit not required, remove load stack entry and the junk 903 -- file table entry, and return No_Unit to indicate not found. 904 905 else 906 Load_Stack.Decrement_Last; 907 Remove_Unit (Unum); 908 end if; 909 910 Unum := No_Unit; 911 goto Done; 912 end if; 913 end if; 914 915 -- Here to exit, with result in Unum 916 917 <<Done>> 918 Parsing_Main_Extended_Source := Save_PMES; 919 Cunit_Boolean_Restrictions_Restore (Save_Cunit_Restrictions); 920 return Unum; 921 end Load_Unit; 922 923 -------------------------- 924 -- Make_Child_Decl_Unit -- 925 -------------------------- 926 927 procedure Make_Child_Decl_Unit (N : Node_Id) is 928 Unit_Decl : constant Node_Id := Library_Unit (N); 929 Unit_Num : constant Unit_Number_Type := Get_Cunit_Unit_Number (N); 930 931 begin 932 Units.Increment_Last; 933 Units.Table (Units.Last) := Units.Table (Unit_Num); 934 Units.Table (Units.Last).Cunit := Unit_Decl; 935 Units.Table (Units.Last).Cunit_Entity := 936 Defining_Identifier 937 (Defining_Unit_Name (Specification (Unit (Unit_Decl)))); 938 Init_Unit_Name (Units.Last, Get_Spec_Name (Unit_Name (Unit_Num))); 939 940 -- The library unit created for of a child subprogram unit plays no 941 -- role in code generation and binding, so label it accordingly. 942 943 Units.Table (Units.Last).Generate_Code := False; 944 Set_Has_No_Elaboration_Code (Unit_Decl); 945 end Make_Child_Decl_Unit; 946 947 ------------------------ 948 -- Make_Instance_Unit -- 949 ------------------------ 950 951 -- If the unit is an instance, it appears as a package declaration, but 952 -- contains both declaration and body of the instance. The body becomes 953 -- the main unit of the compilation, and the declaration is inserted 954 -- at the end of the unit table. The main unit now has the name of a 955 -- body, which is constructed from the name of the original spec, 956 -- and is attached to the compilation node of the original unit. The 957 -- declaration has been attached to a new compilation unit node, and 958 -- code will have to be generated for it. 959 960 procedure Make_Instance_Unit (N : Node_Id; In_Main : Boolean) is 961 Sind : constant Source_File_Index := Source_Index (Main_Unit); 962 963 begin 964 Units.Increment_Last; 965 966 if In_Main then 967 Units.Table (Units.Last) := Units.Table (Main_Unit); 968 Units.Table (Units.Last).Cunit := Library_Unit (N); 969 Init_Unit_Name (Units.Last, Unit_Name (Main_Unit)); 970 971 Units.Table (Main_Unit).Cunit := N; 972 Units.Table (Main_Unit).Version := Source_Checksum (Sind); 973 Init_Unit_Name (Main_Unit, 974 Get_Body_Name 975 (Unit_Name (Get_Cunit_Unit_Number (Library_Unit (N))))); 976 977 else 978 -- Duplicate information from instance unit, for the body. The unit 979 -- node N has been rewritten as a body, but it was placed in the 980 -- units table when first loaded as a declaration. 981 982 Units.Table (Units.Last) := Units.Table (Get_Cunit_Unit_Number (N)); 983 Units.Table (Units.Last).Cunit := Library_Unit (N); 984 end if; 985 end Make_Instance_Unit; 986 987 ------------------------ 988 -- Spec_Is_Irrelevant -- 989 ------------------------ 990 991 function Spec_Is_Irrelevant 992 (Spec_Unit : Unit_Number_Type; 993 Body_Unit : Unit_Number_Type) return Boolean 994 is 995 Sunit : constant Node_Id := Cunit (Spec_Unit); 996 Bunit : constant Node_Id := Cunit (Body_Unit); 997 998 begin 999 -- The spec is irrelevant if the body is a subprogram body, and the spec 1000 -- is other than a subprogram spec or generic subprogram spec. Note that 1001 -- the names must be the same, we don't need to check that, because we 1002 -- already know that from the fact that the file names are the same. 1003 1004 return 1005 Nkind (Unit (Bunit)) = N_Subprogram_Body 1006 and then Nkind (Unit (Sunit)) /= N_Subprogram_Declaration 1007 and then Nkind (Unit (Sunit)) /= N_Generic_Subprogram_Declaration; 1008 end Spec_Is_Irrelevant; 1009 1010 -------------------- 1011 -- Version_Update -- 1012 -------------------- 1013 1014 procedure Version_Update (U : Node_Id; From : Node_Id) is 1015 Unum : constant Unit_Number_Type := Get_Cunit_Unit_Number (U); 1016 Fnum : constant Unit_Number_Type := Get_Cunit_Unit_Number (From); 1017 begin 1018 if Source_Index (Fnum) > No_Source_File then 1019 Units.Table (Unum).Version := 1020 Units.Table (Unum).Version 1021 xor 1022 Source_Checksum (Source_Index (Fnum)); 1023 end if; 1024 end Version_Update; 1025 1026 ---------------------------- 1027 -- Write_Dependency_Chain -- 1028 ---------------------------- 1029 1030 procedure Write_Dependency_Chain is 1031 begin 1032 -- The dependency chain is only written if it is at least two entries 1033 -- deep, otherwise it is trivial (the main unit depending on a unit 1034 -- that it obviously directly depends on). 1035 1036 if Load_Stack.Last - 1 > Load_Stack.First then 1037 for U in Load_Stack.First .. Load_Stack.Last - 1 loop 1038 Error_Msg_Unit_1 := 1039 Unit_Name (Load_Stack.Table (U).Unit_Number); 1040 Error_Msg_Unit_2 := 1041 Unit_Name (Load_Stack.Table (U + 1).Unit_Number); 1042 Error_Msg ("$ depends on $!", Load_Msg_Sloc); 1043 end loop; 1044 end if; 1045 end Write_Dependency_Chain; 1046 1047end Lib.Load; 1048