1------------------------------------------------------------------------------ 2-- -- 3-- GNAT COMPILER COMPONENTS -- 4-- -- 5-- S E M _ C H 1 0 -- 6-- -- 7-- B o d y -- 8-- -- 9-- Copyright (C) 1992-2003 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 2, 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 COPYING. If not, write -- 19-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- 20-- MA 02111-1307, USA. -- 21-- -- 22-- GNAT was originally developed by the GNAT team at New York University. -- 23-- Extensive contributions were provided by Ada Core Technologies Inc. -- 24-- -- 25------------------------------------------------------------------------------ 26 27with Atree; use Atree; 28with Debug; use Debug; 29with Einfo; use Einfo; 30with Errout; use Errout; 31with Elists; use Elists; 32with Exp_Util; use Exp_Util; 33with Fname; use Fname; 34with Fname.UF; use Fname.UF; 35with Freeze; use Freeze; 36with Impunit; use Impunit; 37with Inline; use Inline; 38with Lib; use Lib; 39with Lib.Load; use Lib.Load; 40with Lib.Xref; use Lib.Xref; 41with Namet; use Namet; 42with Nlists; use Nlists; 43with Nmake; use Nmake; 44with Opt; use Opt; 45with Output; use Output; 46with Restrict; use Restrict; 47with Sem; use Sem; 48with Sem_Ch6; use Sem_Ch6; 49with Sem_Ch7; use Sem_Ch7; 50with Sem_Ch8; use Sem_Ch8; 51with Sem_Dist; use Sem_Dist; 52with Sem_Prag; use Sem_Prag; 53with Sem_Util; use Sem_Util; 54with Sem_Warn; use Sem_Warn; 55with Stand; use Stand; 56with Sinfo; use Sinfo; 57with Sinfo.CN; use Sinfo.CN; 58with Sinput; use Sinput; 59with Snames; use Snames; 60with Style; use Style; 61with Stylesw; use Stylesw; 62with Tbuild; use Tbuild; 63with Ttypes; use Ttypes; 64with Uname; use Uname; 65 66package body Sem_Ch10 is 67 68 ----------------------- 69 -- Local Subprograms -- 70 ----------------------- 71 72 procedure Analyze_Context (N : Node_Id); 73 -- Analyzes items in the context clause of compilation unit 74 75 procedure Build_Limited_Views (N : Node_Id); 76 -- Build and decorate the list of shadow entities for a package mentioned 77 -- in a limited_with clause. If the package was not previously analyzed 78 -- then it also performs a basic decoration of the real entities; this 79 -- is required to do not pass non-decorated entities to the back-end. 80 -- Implements Ada0Y (AI-50217). 81 82 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id); 83 -- Check whether the source for the body of a compilation unit must 84 -- be included in a standalone library. 85 86 procedure Check_With_Type_Clauses (N : Node_Id); 87 -- If N is a body, verify that any with_type clauses on the spec, or 88 -- on the spec of any parent, have a matching with_clause. 89 90 procedure Check_Private_Child_Unit (N : Node_Id); 91 -- If a with_clause mentions a private child unit, the compilation 92 -- unit must be a member of the same family, as described in 10.1.2 (8). 93 94 procedure Check_Stub_Level (N : Node_Id); 95 -- Verify that a stub is declared immediately within a compilation unit, 96 -- and not in an inner frame. 97 98 procedure Expand_Limited_With_Clause (Nam : Node_Id; N : Node_Id); 99 -- If a child unit appears in a limited_with clause, there are implicit 100 -- limited_with clauses on all parents that are not already visible 101 -- through a regular with clause. This procedure creates the implicit 102 -- limited with_clauses for the parents and loads the corresponding units. 103 -- The shadow entities are created when the inserted clause is analyzed. 104 -- Implements Ada0Y (AI-50217). 105 106 procedure Expand_With_Clause (Nam : Node_Id; N : Node_Id); 107 -- When a child unit appears in a context clause, the implicit withs on 108 -- parents are made explicit, and with clauses are inserted in the context 109 -- clause before the one for the child. If a parent in the with_clause 110 -- is a renaming, the implicit with_clause is on the renaming whose name 111 -- is mentioned in the with_clause, and not on the package it renames. 112 -- N is the compilation unit whose list of context items receives the 113 -- implicit with_clauses. 114 115 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id; 116 -- Get defining entity of parent unit of a child unit. In most cases this 117 -- is the defining entity of the unit, but for a child instance whose 118 -- parent needs a body for inlining, the instantiation node of the parent 119 -- has not yet been rewritten as a package declaration, and the entity has 120 -- to be retrieved from the Instance_Spec of the unit. 121 122 procedure Implicit_With_On_Parent (Child_Unit : Node_Id; N : Node_Id); 123 -- If the main unit is a child unit, implicit withs are also added for 124 -- all its ancestors. 125 126 procedure Install_Context_Clauses (N : Node_Id); 127 -- Subsidiary to previous one. Process only with_ and use_clauses for 128 -- current unit and its library unit if any. 129 130 procedure Install_Limited_Context_Clauses (N : Node_Id); 131 -- Subsidiary to Install_Context. Process only limited with_clauses 132 -- for current unit. Implements Ada0Y (AI-50217). 133 134 procedure Install_Limited_Withed_Unit (N : Node_Id); 135 -- Place shadow entities for a limited_with package in the visibility 136 -- structures for the current compilation. Implements Ada0Y (AI-50217). 137 138 procedure Install_Withed_Unit (With_Clause : Node_Id); 139 -- If the unit is not a child unit, make unit immediately visible. 140 -- The caller ensures that the unit is not already currently installed. 141 142 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean); 143 -- This procedure establishes the context for the compilation of a child 144 -- unit. If Lib_Unit is a child library spec then the context of the parent 145 -- is installed, and the parent itself made immediately visible, so that 146 -- the child unit is processed in the declarative region of the parent. 147 -- Install_Parents makes a recursive call to itself to ensure that all 148 -- parents are loaded in the nested case. If Lib_Unit is a library body, 149 -- the only effect of Install_Parents is to install the private decls of 150 -- the parents, because the visible parent declarations will have been 151 -- installed as part of the context of the corresponding spec. 152 153 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id); 154 -- In the compilation of a child unit, a child of any of the ancestor 155 -- units is directly visible if it is visible, because the parent is in 156 -- an enclosing scope. Iterate over context to find child units of U_Name 157 -- or of some ancestor of it. 158 159 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean; 160 -- Lib_Unit is a library unit which may be a spec or a body. Is_Child_Spec 161 -- returns True if Lib_Unit is a library spec which is a child spec, i.e. 162 -- a library spec that has a parent. If the call to Is_Child_Spec returns 163 -- True, then Parent_Spec (Lib_Unit) is non-Empty and points to the 164 -- compilation unit for the parent spec. 165 -- 166 -- Lib_Unit can also be a subprogram body that acts as its own spec. If 167 -- the Parent_Spec is non-empty, this is also a child unit. 168 169 procedure Remove_With_Type_Clause (Name : Node_Id); 170 -- Remove imported type and its enclosing package from visibility, and 171 -- remove attributes of imported type so they don't interfere with its 172 -- analysis (should it appear otherwise in the context). 173 174 procedure Remove_Context_Clauses (N : Node_Id); 175 -- Subsidiary of previous one. Remove use_ and with_clauses. 176 177 procedure Remove_Limited_With_Clause (N : Node_Id); 178 -- Remove from visibility the shadow entities introduced for a package 179 -- mentioned in a limited_with clause. Implements Ada0Y (AI-50217). 180 181 procedure Remove_Parents (Lib_Unit : Node_Id); 182 -- Remove_Parents checks if Lib_Unit is a child spec. If so then the parent 183 -- contexts established by the corresponding call to Install_Parents are 184 -- removed. Remove_Parents contains a recursive call to itself to ensure 185 -- that all parents are removed in the nested case. 186 187 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id); 188 -- Reset all visibility flags on unit after compiling it, either as a 189 -- main unit or as a unit in the context. 190 191 procedure Unchain (E : Entity_Id); 192 -- Remove single entity from visibility list 193 194 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id); 195 -- Common processing for all stubs (subprograms, tasks, packages, and 196 -- protected cases). N is the stub to be analyzed. Once the subunit 197 -- name is established, load and analyze. Nam is the non-overloadable 198 -- entity for which the proper body provides a completion. Subprogram 199 -- stubs are handled differently because they can be declarations. 200 201 -------------------------- 202 -- Limited_With_Clauses -- 203 -------------------------- 204 205 -- Limited_With clauses are the mechanism chosen for Ada05 to support 206 -- mutually recursive types declared in different units. A limited_with 207 -- clause that names package P in the context of unit U makes the types 208 -- declared in the visible part of P available within U, but with the 209 -- restriction that these types can only be used as incomplete types. 210 -- The limited_with clause does not impose a semantic dependence on P, 211 -- and it is possible for two packages to have limited_with_clauses on 212 -- each other without creating an elaboration circularity. 213 214 -- To support this feature, the analysis of a limited_with clause must 215 -- create an abbreviated view of the package, without performing any 216 -- semantic analysis on it. This "package abstract" contains shadow 217 -- types that are in one-one correspondence with the real types in the 218 -- package, and that have the properties of incomplete types. 219 220 -- The implementation creates two element lists: one to chain the shadow 221 -- entities, and one to chain the corresponding type entities in the tree 222 -- of the package. Links between corresponding entities in both chains 223 -- allow the compiler to select the proper view of a given type, depending 224 -- on the context. Note that in contrast with the handling of private 225 -- types, the limited view and the non-limited view of a type are treated 226 -- as separate entities, and no entity exchange needs to take place, which 227 -- makes the implementation must simpler than could be feared. 228 229 ------------------------------ 230 -- Analyze_Compilation_Unit -- 231 ------------------------------ 232 233 procedure Analyze_Compilation_Unit (N : Node_Id) is 234 Unit_Node : constant Node_Id := Unit (N); 235 Lib_Unit : Node_Id := Library_Unit (N); 236 Spec_Id : Node_Id; 237 Main_Cunit : constant Node_Id := Cunit (Main_Unit); 238 Par_Spec_Name : Unit_Name_Type; 239 Unum : Unit_Number_Type; 240 241 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id); 242 -- Generate cross-reference information for the parents of child units. 243 -- N is a defining_program_unit_name, and P_Id is the immediate parent. 244 245 -------------------------------- 246 -- Generate_Parent_References -- 247 -------------------------------- 248 249 procedure Generate_Parent_References (N : Node_Id; P_Id : Entity_Id) is 250 Pref : Node_Id; 251 P_Name : Entity_Id := P_Id; 252 253 begin 254 Pref := Name (Parent (Defining_Entity (N))); 255 256 if Nkind (Pref) = N_Expanded_Name then 257 258 -- Done already, if the unit has been compiled indirectly as 259 -- part of the closure of its context because of inlining. 260 261 return; 262 end if; 263 264 while Nkind (Pref) = N_Selected_Component loop 265 Change_Selected_Component_To_Expanded_Name (Pref); 266 Set_Entity (Pref, P_Name); 267 Set_Etype (Pref, Etype (P_Name)); 268 Generate_Reference (P_Name, Pref, 'r'); 269 Pref := Prefix (Pref); 270 P_Name := Scope (P_Name); 271 end loop; 272 273 -- The guard here on P_Name is to handle the error condition where 274 -- the parent unit is missing because the file was not found. 275 276 if Present (P_Name) then 277 Set_Entity (Pref, P_Name); 278 Set_Etype (Pref, Etype (P_Name)); 279 Generate_Reference (P_Name, Pref, 'r'); 280 Style.Check_Identifier (Pref, P_Name); 281 end if; 282 end Generate_Parent_References; 283 284 -- Start of processing for Analyze_Compilation_Unit 285 286 begin 287 Process_Compilation_Unit_Pragmas (N); 288 289 -- If the unit is a subunit whose parent has not been analyzed (which 290 -- indicates that the main unit is a subunit, either the current one or 291 -- one of its descendents) then the subunit is compiled as part of the 292 -- analysis of the parent, which we proceed to do. Basically this gets 293 -- handled from the top down and we don't want to do anything at this 294 -- level (i.e. this subunit will be handled on the way down from the 295 -- parent), so at this level we immediately return. If the subunit 296 -- ends up not analyzed, it means that the parent did not contain a 297 -- stub for it, or that there errors were dectected in some ancestor. 298 299 if Nkind (Unit_Node) = N_Subunit 300 and then not Analyzed (Lib_Unit) 301 then 302 Semantics (Lib_Unit); 303 304 if not Analyzed (Proper_Body (Unit_Node)) then 305 if Serious_Errors_Detected > 0 then 306 Error_Msg_N ("subunit not analyzed (errors in parent unit)", N); 307 else 308 Error_Msg_N ("missing stub for subunit", N); 309 end if; 310 end if; 311 312 return; 313 end if; 314 315 -- Analyze context (this will call Sem recursively for with'ed units) 316 317 Analyze_Context (N); 318 319 -- If the unit is a package body, the spec is already loaded and must 320 -- be analyzed first, before we analyze the body. 321 322 if Nkind (Unit_Node) = N_Package_Body then 323 324 -- If no Lib_Unit, then there was a serious previous error, so 325 -- just ignore the entire analysis effort 326 327 if No (Lib_Unit) then 328 return; 329 330 else 331 Semantics (Lib_Unit); 332 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit)); 333 334 -- Verify that the library unit is a package declaration. 335 336 if Nkind (Unit (Lib_Unit)) /= N_Package_Declaration 337 and then 338 Nkind (Unit (Lib_Unit)) /= N_Generic_Package_Declaration 339 then 340 Error_Msg_N 341 ("no legal package declaration for package body", N); 342 return; 343 344 -- Otherwise, the entity in the declaration is visible. Update 345 -- the version to reflect dependence of this body on the spec. 346 347 else 348 Spec_Id := Defining_Entity (Unit (Lib_Unit)); 349 Set_Is_Immediately_Visible (Spec_Id, True); 350 Version_Update (N, Lib_Unit); 351 352 if Nkind (Defining_Unit_Name (Unit_Node)) 353 = N_Defining_Program_Unit_Name 354 then 355 Generate_Parent_References (Unit_Node, Scope (Spec_Id)); 356 end if; 357 end if; 358 end if; 359 360 -- If the unit is a subprogram body, then we similarly need to analyze 361 -- its spec. However, things are a little simpler in this case, because 362 -- here, this analysis is done only for error checking and consistency 363 -- purposes, so there's nothing else to be done. 364 365 elsif Nkind (Unit_Node) = N_Subprogram_Body then 366 if Acts_As_Spec (N) then 367 368 -- If the subprogram body is a child unit, we must create a 369 -- declaration for it, in order to properly load the parent(s). 370 -- After this, the original unit does not acts as a spec, because 371 -- there is an explicit one. If this unit appears in a context 372 -- clause, then an implicit with on the parent will be added when 373 -- installing the context. If this is the main unit, there is no 374 -- Unit_Table entry for the declaration, (It has the unit number 375 -- of the main unit) and code generation is unaffected. 376 377 Unum := Get_Cunit_Unit_Number (N); 378 Par_Spec_Name := Get_Parent_Spec_Name (Unit_Name (Unum)); 379 380 if Par_Spec_Name /= No_Name then 381 Unum := 382 Load_Unit 383 (Load_Name => Par_Spec_Name, 384 Required => True, 385 Subunit => False, 386 Error_Node => N); 387 388 if Unum /= No_Unit then 389 390 -- Build subprogram declaration and attach parent unit to it 391 -- This subprogram declaration does not come from source! 392 393 declare 394 Loc : constant Source_Ptr := Sloc (N); 395 SCS : constant Boolean := 396 Get_Comes_From_Source_Default; 397 398 begin 399 Set_Comes_From_Source_Default (False); 400 Lib_Unit := 401 Make_Compilation_Unit (Loc, 402 Context_Items => New_Copy_List (Context_Items (N)), 403 Unit => 404 Make_Subprogram_Declaration (Sloc (N), 405 Specification => 406 Copy_Separate_Tree 407 (Specification (Unit_Node))), 408 Aux_Decls_Node => 409 Make_Compilation_Unit_Aux (Loc)); 410 411 Set_Library_Unit (N, Lib_Unit); 412 Set_Parent_Spec (Unit (Lib_Unit), Cunit (Unum)); 413 Semantics (Lib_Unit); 414 Set_Acts_As_Spec (N, False); 415 Set_Comes_From_Source_Default (SCS); 416 end; 417 end if; 418 end if; 419 420 -- Here for subprogram with separate declaration 421 422 else 423 Semantics (Lib_Unit); 424 Check_Unused_Withs (Get_Cunit_Unit_Number (Lib_Unit)); 425 Version_Update (N, Lib_Unit); 426 end if; 427 428 if Nkind (Defining_Unit_Name (Specification (Unit_Node))) = 429 N_Defining_Program_Unit_Name 430 then 431 Generate_Parent_References ( 432 Specification (Unit_Node), 433 Scope (Defining_Entity (Unit (Lib_Unit)))); 434 end if; 435 end if; 436 437 -- If it is a child unit, the parent must be elaborated first 438 -- and we update version, since we are dependent on our parent. 439 440 if Is_Child_Spec (Unit_Node) then 441 442 -- The analysis of the parent is done with style checks off 443 444 declare 445 Save_Style_Check : constant Boolean := Style_Check; 446 Save_C_Restrict : constant Save_Compilation_Unit_Restrictions := 447 Compilation_Unit_Restrictions_Save; 448 449 begin 450 if not GNAT_Mode then 451 Style_Check := False; 452 end if; 453 454 Semantics (Parent_Spec (Unit_Node)); 455 Version_Update (N, Parent_Spec (Unit_Node)); 456 Style_Check := Save_Style_Check; 457 Compilation_Unit_Restrictions_Restore (Save_C_Restrict); 458 end; 459 end if; 460 461 -- With the analysis done, install the context. Note that we can't 462 -- install the context from the with clauses as we analyze them, 463 -- because each with clause must be analyzed in a clean visibility 464 -- context, so we have to wait and install them all at once. 465 466 Install_Context (N); 467 468 if Is_Child_Spec (Unit_Node) then 469 470 -- Set the entities of all parents in the program_unit_name. 471 472 Generate_Parent_References ( 473 Unit_Node, Get_Parent_Entity (Unit (Parent_Spec (Unit_Node)))); 474 end if; 475 476 -- All components of the context: with-clauses, library unit, ancestors 477 -- if any, (and their context) are analyzed and installed. Now analyze 478 -- the unit itself, which is either a package, subprogram spec or body. 479 480 Analyze (Unit_Node); 481 482 -- The above call might have made Unit_Node an N_Subprogram_Body 483 -- from something else, so propagate any Acts_As_Spec flag. 484 485 if Nkind (Unit_Node) = N_Subprogram_Body 486 and then Acts_As_Spec (Unit_Node) 487 then 488 Set_Acts_As_Spec (N); 489 end if; 490 491 -- Treat compilation unit pragmas that appear after the library unit 492 493 if Present (Pragmas_After (Aux_Decls_Node (N))) then 494 declare 495 Prag_Node : Node_Id := First (Pragmas_After (Aux_Decls_Node (N))); 496 497 begin 498 while Present (Prag_Node) loop 499 Analyze (Prag_Node); 500 Next (Prag_Node); 501 end loop; 502 end; 503 end if; 504 505 -- Generate distribution stub files if requested and no error 506 507 if N = Main_Cunit 508 and then (Distribution_Stub_Mode = Generate_Receiver_Stub_Body 509 or else 510 Distribution_Stub_Mode = Generate_Caller_Stub_Body) 511 and then not Fatal_Error (Main_Unit) 512 then 513 if Is_RCI_Pkg_Spec_Or_Body (N) then 514 515 -- Regular RCI package 516 517 Add_Stub_Constructs (N); 518 519 elsif (Nkind (Unit_Node) = N_Package_Declaration 520 and then Is_Shared_Passive (Defining_Entity 521 (Specification (Unit_Node)))) 522 or else (Nkind (Unit_Node) = N_Package_Body 523 and then 524 Is_Shared_Passive (Corresponding_Spec (Unit_Node))) 525 then 526 -- Shared passive package 527 528 Add_Stub_Constructs (N); 529 530 elsif Nkind (Unit_Node) = N_Package_Instantiation 531 and then 532 Is_Remote_Call_Interface 533 (Defining_Entity (Specification (Instance_Spec (Unit_Node)))) 534 then 535 -- Instantiation of a RCI generic package 536 537 Add_Stub_Constructs (N); 538 end if; 539 540 -- Reanalyze the unit with the new constructs 541 542 Analyze (Unit_Node); 543 end if; 544 545 if Nkind (Unit_Node) = N_Package_Declaration 546 or else Nkind (Unit_Node) in N_Generic_Declaration 547 or else Nkind (Unit_Node) = N_Package_Renaming_Declaration 548 or else Nkind (Unit_Node) = N_Subprogram_Declaration 549 then 550 Remove_Unit_From_Visibility (Defining_Entity (Unit_Node)); 551 552 -- If the unit is an instantiation whose body will be elaborated 553 -- for inlining purposes, use the the proper entity of the instance. 554 555 elsif Nkind (Unit_Node) = N_Package_Instantiation 556 and then not Error_Posted (Unit_Node) 557 then 558 Remove_Unit_From_Visibility 559 (Defining_Entity (Instance_Spec (Unit_Node))); 560 561 elsif Nkind (Unit_Node) = N_Package_Body 562 or else (Nkind (Unit_Node) = N_Subprogram_Body 563 and then not Acts_As_Spec (Unit_Node)) 564 then 565 -- Bodies that are not the main unit are compiled if they 566 -- are generic or contain generic or inlined units. Their 567 -- analysis brings in the context of the corresponding spec 568 -- (unit declaration) which must be removed as well, to 569 -- return the compilation environment to its proper state. 570 571 Remove_Context (Lib_Unit); 572 Set_Is_Immediately_Visible (Defining_Entity (Unit (Lib_Unit)), False); 573 end if; 574 575 -- Last step is to deinstall the context we just installed 576 -- as well as the unit just compiled. 577 578 Remove_Context (N); 579 580 -- If this is the main unit and we are generating code, we must 581 -- check that all generic units in the context have a body if they 582 -- need it, even if they have not been instantiated. In the absence 583 -- of .ali files for generic units, we must force the load of the body, 584 -- just to produce the proper error if the body is absent. We skip this 585 -- verification if the main unit itself is generic. 586 587 if Get_Cunit_Unit_Number (N) = Main_Unit 588 and then Operating_Mode = Generate_Code 589 and then Expander_Active 590 then 591 -- Check whether the source for the body of the unit must be 592 -- included in a standalone library. 593 594 Check_Body_Needed_For_SAL (Cunit_Entity (Main_Unit)); 595 596 -- Indicate that the main unit is now analyzed, to catch possible 597 -- circularities between it and generic bodies. Remove main unit 598 -- from visibility. This might seem superfluous, but the main unit 599 -- must not be visible in the generic body expansions that follow. 600 601 Set_Analyzed (N, True); 602 Set_Is_Immediately_Visible (Cunit_Entity (Main_Unit), False); 603 604 declare 605 Item : Node_Id; 606 Nam : Entity_Id; 607 Un : Unit_Number_Type; 608 609 Save_Style_Check : constant Boolean := Style_Check; 610 Save_C_Restrict : constant Save_Compilation_Unit_Restrictions := 611 Compilation_Unit_Restrictions_Save; 612 613 begin 614 Item := First (Context_Items (N)); 615 while Present (Item) loop 616 617 -- Ada0Y (AI-50217): Do not consider limited-withed units 618 619 if Nkind (Item) = N_With_Clause 620 and then not Implicit_With (Item) 621 and then not Limited_Present (Item) 622 then 623 Nam := Entity (Name (Item)); 624 625 if (Is_Generic_Subprogram (Nam) 626 and then not Is_Intrinsic_Subprogram (Nam)) 627 or else (Ekind (Nam) = E_Generic_Package 628 and then Unit_Requires_Body (Nam)) 629 then 630 Style_Check := False; 631 632 if Present (Renamed_Object (Nam)) then 633 Un := 634 Load_Unit 635 (Load_Name => Get_Body_Name 636 (Get_Unit_Name 637 (Unit_Declaration_Node 638 (Renamed_Object (Nam)))), 639 Required => False, 640 Subunit => False, 641 Error_Node => N, 642 Renamings => True); 643 else 644 Un := 645 Load_Unit 646 (Load_Name => Get_Body_Name 647 (Get_Unit_Name (Item)), 648 Required => False, 649 Subunit => False, 650 Error_Node => N, 651 Renamings => True); 652 end if; 653 654 if Un = No_Unit then 655 Error_Msg_NE 656 ("body of generic unit& not found", Item, Nam); 657 exit; 658 659 elsif not Analyzed (Cunit (Un)) 660 and then Un /= Main_Unit 661 and then not Fatal_Error (Un) 662 then 663 Style_Check := False; 664 Semantics (Cunit (Un)); 665 end if; 666 end if; 667 end if; 668 669 Next (Item); 670 end loop; 671 672 Style_Check := Save_Style_Check; 673 Compilation_Unit_Restrictions_Restore (Save_C_Restrict); 674 end; 675 end if; 676 677 -- Deal with creating elaboration Boolean if needed. We create an 678 -- elaboration boolean only for units that come from source since 679 -- units manufactured by the compiler never need elab checks. 680 681 if Comes_From_Source (N) 682 and then 683 (Nkind (Unit (N)) = N_Package_Declaration or else 684 Nkind (Unit (N)) = N_Generic_Package_Declaration or else 685 Nkind (Unit (N)) = N_Subprogram_Declaration or else 686 Nkind (Unit (N)) = N_Generic_Subprogram_Declaration) 687 then 688 declare 689 Loc : constant Source_Ptr := Sloc (N); 690 Unum : constant Unit_Number_Type := Get_Source_Unit (Loc); 691 692 begin 693 Spec_Id := Defining_Entity (Unit (N)); 694 Generate_Definition (Spec_Id); 695 696 -- See if an elaboration entity is required for possible 697 -- access before elaboration checking. Note that we must 698 -- allow for this even if -gnatE is not set, since a client 699 -- may be compiled in -gnatE mode and reference the entity. 700 701 -- Case of units which do not require elaboration checks 702 703 if 704 -- Pure units do not need checks 705 706 Is_Pure (Spec_Id) 707 708 -- Preelaborated units do not need checks 709 710 or else Is_Preelaborated (Spec_Id) 711 712 -- No checks needed if pagma Elaborate_Body present 713 714 or else Has_Pragma_Elaborate_Body (Spec_Id) 715 716 -- No checks needed if unit does not require a body 717 718 or else not Unit_Requires_Body (Spec_Id) 719 720 -- No checks needed for predefined files 721 722 or else Is_Predefined_File_Name (Unit_File_Name (Unum)) 723 724 -- No checks required if no separate spec 725 726 or else Acts_As_Spec (N) 727 then 728 -- This is a case where we only need the entity for 729 -- checking to prevent multiple elaboration checks. 730 731 Set_Elaboration_Entity_Required (Spec_Id, False); 732 733 -- Case of elaboration entity is required for access before 734 -- elaboration checking (so certainly we must build it!) 735 736 else 737 Set_Elaboration_Entity_Required (Spec_Id, True); 738 end if; 739 740 Build_Elaboration_Entity (N, Spec_Id); 741 end; 742 end if; 743 744 -- Finally, freeze the compilation unit entity. This for sure is needed 745 -- because of some warnings that can be output (see Freeze_Subprogram), 746 -- but may in general be required. If freezing actions result, place 747 -- them in the compilation unit actions list, and analyze them. 748 749 declare 750 Loc : constant Source_Ptr := Sloc (N); 751 L : constant List_Id := 752 Freeze_Entity (Cunit_Entity (Current_Sem_Unit), Loc); 753 754 begin 755 while Is_Non_Empty_List (L) loop 756 Insert_Library_Level_Action (Remove_Head (L)); 757 end loop; 758 end; 759 760 Set_Analyzed (N); 761 762 if Nkind (Unit_Node) = N_Package_Declaration 763 and then Get_Cunit_Unit_Number (N) /= Main_Unit 764 and then Expander_Active 765 then 766 declare 767 Save_Style_Check : constant Boolean := Style_Check; 768 Save_Warning : constant Warning_Mode_Type := Warning_Mode; 769 Options : Style_Check_Options; 770 771 begin 772 Save_Style_Check_Options (Options); 773 Reset_Style_Check_Options; 774 Opt.Warning_Mode := Suppress; 775 Check_Body_For_Inlining (N, Defining_Entity (Unit_Node)); 776 777 Reset_Style_Check_Options; 778 Set_Style_Check_Options (Options); 779 Style_Check := Save_Style_Check; 780 Warning_Mode := Save_Warning; 781 end; 782 end if; 783 end Analyze_Compilation_Unit; 784 785 --------------------- 786 -- Analyze_Context -- 787 --------------------- 788 789 procedure Analyze_Context (N : Node_Id) is 790 Item : Node_Id; 791 792 begin 793 -- Loop through context items. This is done is three passes: 794 -- a) The first pass analyze non-limited with-clauses. 795 -- b) The second pass add implicit limited_with clauses for 796 -- the parents of child units (Ada0Y: AI-50217) 797 -- c) The third pass analyzes limited_with clauses (Ada0Y: AI-50217) 798 799 Item := First (Context_Items (N)); 800 while Present (Item) loop 801 802 -- For with clause, analyze the with clause, and then update 803 -- the version, since we are dependent on a unit that we with. 804 805 if Nkind (Item) = N_With_Clause 806 and then not Limited_Present (Item) 807 then 808 809 -- Skip analyzing with clause if no unit, nothing to do (this 810 -- happens for a with that references a non-existant unit) 811 812 if Present (Library_Unit (Item)) then 813 Analyze (Item); 814 end if; 815 816 if not Implicit_With (Item) then 817 Version_Update (N, Library_Unit (Item)); 818 end if; 819 820 -- But skip use clauses at this stage, since we don't want to do 821 -- any installing of potentially use visible entities until we 822 -- we actually install the complete context (in Install_Context). 823 -- Otherwise things can get installed in the wrong context. 824 -- Similarly, pragmas are analyzed in Install_Context, after all 825 -- the implicit with's on parent units are generated. 826 827 else 828 null; 829 end if; 830 831 Next (Item); 832 end loop; 833 834 -- Second pass: add implicit limited_with_clauses for parents of 835 -- child units mentioned in limited_with clauses. 836 837 Item := First (Context_Items (N)); 838 839 while Present (Item) loop 840 if Nkind (Item) = N_With_Clause 841 and then Limited_Present (Item) 842 and then Nkind (Name (Item)) = N_Selected_Component 843 then 844 Expand_Limited_With_Clause 845 (Nam => Prefix (Name (Item)), N => Item); 846 end if; 847 848 Next (Item); 849 end loop; 850 851 -- Third pass: examine all limited_with clauses. 852 853 Item := First (Context_Items (N)); 854 855 while Present (Item) loop 856 if Nkind (Item) = N_With_Clause 857 and then Limited_Present (Item) 858 then 859 860 if Nkind (Unit (N)) /= N_Package_Declaration then 861 Error_Msg_N ("limited with_clause only allowed in" 862 & " package specification", Item); 863 end if; 864 865 -- Skip analyzing with clause if no unit, see above. 866 867 if Present (Library_Unit (Item)) then 868 Analyze (Item); 869 end if; 870 871 -- A limited_with does not impose an elaboration order, but 872 -- there is a semantic dependency for recompilation purposes. 873 874 if not Implicit_With (Item) then 875 Version_Update (N, Library_Unit (Item)); 876 end if; 877 end if; 878 879 Next (Item); 880 end loop; 881 end Analyze_Context; 882 883 ------------------------------- 884 -- Analyze_Package_Body_Stub -- 885 ------------------------------- 886 887 procedure Analyze_Package_Body_Stub (N : Node_Id) is 888 Id : constant Entity_Id := Defining_Identifier (N); 889 Nam : Entity_Id; 890 891 begin 892 -- The package declaration must be in the current declarative part. 893 894 Check_Stub_Level (N); 895 Nam := Current_Entity_In_Scope (Id); 896 897 if No (Nam) or else not Is_Package (Nam) then 898 Error_Msg_N ("missing specification for package stub", N); 899 900 elsif Has_Completion (Nam) 901 and then Present (Corresponding_Body (Unit_Declaration_Node (Nam))) 902 then 903 Error_Msg_N ("duplicate or redundant stub for package", N); 904 905 else 906 -- Indicate that the body of the package exists. If we are doing 907 -- only semantic analysis, the stub stands for the body. If we are 908 -- generating code, the existence of the body will be confirmed 909 -- when we load the proper body. 910 911 Set_Has_Completion (Nam); 912 Set_Scope (Defining_Entity (N), Current_Scope); 913 Generate_Reference (Nam, Id, 'b'); 914 Analyze_Proper_Body (N, Nam); 915 end if; 916 end Analyze_Package_Body_Stub; 917 918 ------------------------- 919 -- Analyze_Proper_Body -- 920 ------------------------- 921 922 procedure Analyze_Proper_Body (N : Node_Id; Nam : Entity_Id) is 923 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N); 924 Unum : Unit_Number_Type; 925 926 procedure Optional_Subunit; 927 -- This procedure is called when the main unit is a stub, or when we 928 -- are not generating code. In such a case, we analyze the subunit if 929 -- present, which is user-friendly and in fact required for ASIS, but 930 -- we don't complain if the subunit is missing. 931 932 ---------------------- 933 -- Optional_Subunit -- 934 ---------------------- 935 936 procedure Optional_Subunit is 937 Comp_Unit : Node_Id; 938 939 begin 940 -- Try to load subunit, but ignore any errors that occur during 941 -- the loading of the subunit, by using the special feature in 942 -- Errout to ignore all errors. Note that Fatal_Error will still 943 -- be set, so we will be able to check for this case below. 944 945 Ignore_Errors_Enable := Ignore_Errors_Enable + 1; 946 Unum := 947 Load_Unit 948 (Load_Name => Subunit_Name, 949 Required => False, 950 Subunit => True, 951 Error_Node => N); 952 Ignore_Errors_Enable := Ignore_Errors_Enable - 1; 953 954 -- All done if we successfully loaded the subunit 955 956 if Unum /= No_Unit 957 and then (not Fatal_Error (Unum) or else Try_Semantics) 958 then 959 Comp_Unit := Cunit (Unum); 960 961 Set_Corresponding_Stub (Unit (Comp_Unit), N); 962 Analyze_Subunit (Comp_Unit); 963 Set_Library_Unit (N, Comp_Unit); 964 965 elsif Unum = No_Unit 966 and then Present (Nam) 967 then 968 if Is_Protected_Type (Nam) then 969 Set_Corresponding_Body (Parent (Nam), Defining_Identifier (N)); 970 else 971 Set_Corresponding_Body ( 972 Unit_Declaration_Node (Nam), Defining_Identifier (N)); 973 end if; 974 end if; 975 end Optional_Subunit; 976 977 -- Start of processing for Analyze_Proper_Body 978 979 begin 980 -- If the subunit is already loaded, it means that the main unit 981 -- is a subunit, and that the current unit is one of its parents 982 -- which was being analyzed to provide the needed context for the 983 -- analysis of the subunit. In this case we analyze the subunit and 984 -- continue with the parent, without looking a subsequent subunits. 985 986 if Is_Loaded (Subunit_Name) then 987 988 -- If the proper body is already linked to the stub node, 989 -- the stub is in a generic unit and just needs analyzing. 990 991 if Present (Library_Unit (N)) then 992 Set_Corresponding_Stub (Unit (Library_Unit (N)), N); 993 Analyze_Subunit (Library_Unit (N)); 994 995 -- Otherwise we must load the subunit and link to it 996 997 else 998 -- Load the subunit, this must work, since we originally 999 -- loaded the subunit earlier on. So this will not really 1000 -- load it, just give access to it. 1001 1002 Unum := 1003 Load_Unit 1004 (Load_Name => Subunit_Name, 1005 Required => True, 1006 Subunit => False, 1007 Error_Node => N); 1008 1009 -- And analyze the subunit in the parent context (note that we 1010 -- do not call Semantics, since that would remove the parent 1011 -- context). Because of this, we have to manually reset the 1012 -- compiler state to Analyzing since it got destroyed by Load. 1013 1014 if Unum /= No_Unit then 1015 Compiler_State := Analyzing; 1016 1017 -- Check that the proper body is a subunit and not a child 1018 -- unit. If the unit was previously loaded, the error will 1019 -- have been emitted when copying the generic node, so we 1020 -- just return to avoid cascaded errors. 1021 1022 if Nkind (Unit (Cunit (Unum))) /= N_Subunit then 1023 return; 1024 end if; 1025 1026 Set_Corresponding_Stub (Unit (Cunit (Unum)), N); 1027 Analyze_Subunit (Cunit (Unum)); 1028 Set_Library_Unit (N, Cunit (Unum)); 1029 end if; 1030 end if; 1031 1032 -- If the main unit is a subunit, then we are just performing semantic 1033 -- analysis on that subunit, and any other subunits of any parent unit 1034 -- should be ignored, except that if we are building trees for ASIS 1035 -- usage we want to annotate the stub properly. 1036 1037 elsif Nkind (Unit (Cunit (Main_Unit))) = N_Subunit 1038 and then Subunit_Name /= Unit_Name (Main_Unit) 1039 then 1040 if ASIS_Mode then 1041 Optional_Subunit; 1042 end if; 1043 1044 -- But before we return, set the flag for unloaded subunits. This 1045 -- will suppress junk warnings of variables in the same declarative 1046 -- part (or a higher level one) that are in danger of looking unused 1047 -- when in fact there might be a declaration in the subunit that we 1048 -- do not intend to load. 1049 1050 Unloaded_Subunits := True; 1051 return; 1052 1053 -- If the subunit is not already loaded, and we are generating code, 1054 -- then this is the case where compilation started from the parent, 1055 -- and we are generating code for an entire subunit tree. In that 1056 -- case we definitely need to load the subunit. 1057 1058 -- In order to continue the analysis with the rest of the parent, 1059 -- and other subunits, we load the unit without requiring its 1060 -- presence, and emit a warning if not found, rather than terminating 1061 -- the compilation abruptly, as for other missing file problems. 1062 1063 elsif Original_Operating_Mode = Generate_Code then 1064 1065 -- If the proper body is already linked to the stub node, 1066 -- the stub is in a generic unit and just needs analyzing. 1067 1068 -- We update the version. Although we are not technically 1069 -- semantically dependent on the subunit, given our approach 1070 -- of macro substitution of subunits, it makes sense to 1071 -- include it in the version identification. 1072 1073 if Present (Library_Unit (N)) then 1074 Set_Corresponding_Stub (Unit (Library_Unit (N)), N); 1075 Analyze_Subunit (Library_Unit (N)); 1076 Version_Update (Cunit (Main_Unit), Library_Unit (N)); 1077 1078 -- Otherwise we must load the subunit and link to it 1079 1080 else 1081 Unum := 1082 Load_Unit 1083 (Load_Name => Subunit_Name, 1084 Required => False, 1085 Subunit => True, 1086 Error_Node => N); 1087 1088 if Original_Operating_Mode = Generate_Code 1089 and then Unum = No_Unit 1090 then 1091 Error_Msg_Name_1 := Subunit_Name; 1092 Error_Msg_Name_2 := 1093 Get_File_Name (Subunit_Name, Subunit => True); 1094 Error_Msg_N 1095 ("subunit% in file{ not found!?", N); 1096 Subunits_Missing := True; 1097 end if; 1098 1099 -- Load_Unit may reset Compiler_State, since it may have been 1100 -- necessary to parse an additional units, so we make sure 1101 -- that we reset it to the Analyzing state. 1102 1103 Compiler_State := Analyzing; 1104 1105 if Unum /= No_Unit 1106 and then (not Fatal_Error (Unum) or else Try_Semantics) 1107 then 1108 if Debug_Flag_L then 1109 Write_Str ("*** Loaded subunit from stub. Analyze"); 1110 Write_Eol; 1111 end if; 1112 1113 declare 1114 Comp_Unit : constant Node_Id := Cunit (Unum); 1115 1116 begin 1117 -- Check for child unit instead of subunit 1118 1119 if Nkind (Unit (Comp_Unit)) /= N_Subunit then 1120 Error_Msg_N 1121 ("expected SEPARATE subunit, found child unit", 1122 Cunit_Entity (Unum)); 1123 1124 -- OK, we have a subunit, so go ahead and analyze it, 1125 -- and set Scope of entity in stub, for ASIS use. 1126 1127 else 1128 Set_Corresponding_Stub (Unit (Comp_Unit), N); 1129 Analyze_Subunit (Comp_Unit); 1130 Set_Library_Unit (N, Comp_Unit); 1131 1132 -- We update the version. Although we are not technically 1133 -- semantically dependent on the subunit, given our 1134 -- approach of macro substitution of subunits, it makes 1135 -- sense to include it in the version identification. 1136 1137 Version_Update (Cunit (Main_Unit), Comp_Unit); 1138 end if; 1139 end; 1140 end if; 1141 end if; 1142 1143 -- The remaining case is when the subunit is not already loaded and 1144 -- we are not generating code. In this case we are just performing 1145 -- semantic analysis on the parent, and we are not interested in 1146 -- the subunit. For subprograms, analyze the stub as a body. For 1147 -- other entities the stub has already been marked as completed. 1148 1149 else 1150 Optional_Subunit; 1151 end if; 1152 1153 end Analyze_Proper_Body; 1154 1155 ---------------------------------- 1156 -- Analyze_Protected_Body_Stub -- 1157 ---------------------------------- 1158 1159 procedure Analyze_Protected_Body_Stub (N : Node_Id) is 1160 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N)); 1161 1162 begin 1163 Check_Stub_Level (N); 1164 1165 -- First occurence of name may have been as an incomplete type. 1166 1167 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then 1168 Nam := Full_View (Nam); 1169 end if; 1170 1171 if No (Nam) 1172 or else not Is_Protected_Type (Etype (Nam)) 1173 then 1174 Error_Msg_N ("missing specification for Protected body", N); 1175 else 1176 Set_Scope (Defining_Entity (N), Current_Scope); 1177 Set_Has_Completion (Etype (Nam)); 1178 Generate_Reference (Nam, Defining_Identifier (N), 'b'); 1179 Analyze_Proper_Body (N, Etype (Nam)); 1180 end if; 1181 end Analyze_Protected_Body_Stub; 1182 1183 ---------------------------------- 1184 -- Analyze_Subprogram_Body_Stub -- 1185 ---------------------------------- 1186 1187 -- A subprogram body stub can appear with or without a previous 1188 -- specification. If there is one, the analysis of the body will 1189 -- find it and verify conformance. The formals appearing in the 1190 -- specification of the stub play no role, except for requiring an 1191 -- additional conformance check. If there is no previous subprogram 1192 -- declaration, the stub acts as a spec, and provides the defining 1193 -- entity for the subprogram. 1194 1195 procedure Analyze_Subprogram_Body_Stub (N : Node_Id) is 1196 Decl : Node_Id; 1197 1198 begin 1199 Check_Stub_Level (N); 1200 1201 -- Verify that the identifier for the stub is unique within this 1202 -- declarative part. 1203 1204 if Nkind (Parent (N)) = N_Block_Statement 1205 or else Nkind (Parent (N)) = N_Package_Body 1206 or else Nkind (Parent (N)) = N_Subprogram_Body 1207 then 1208 Decl := First (Declarations (Parent (N))); 1209 1210 while Present (Decl) 1211 and then Decl /= N 1212 loop 1213 if Nkind (Decl) = N_Subprogram_Body_Stub 1214 and then (Chars (Defining_Unit_Name (Specification (Decl))) 1215 = Chars (Defining_Unit_Name (Specification (N)))) 1216 then 1217 Error_Msg_N ("identifier for stub is not unique", N); 1218 end if; 1219 1220 Next (Decl); 1221 end loop; 1222 end if; 1223 1224 -- Treat stub as a body, which checks conformance if there is a previous 1225 -- declaration, or else introduces entity and its signature. 1226 1227 Analyze_Subprogram_Body (N); 1228 Analyze_Proper_Body (N, Empty); 1229 end Analyze_Subprogram_Body_Stub; 1230 1231 --------------------- 1232 -- Analyze_Subunit -- 1233 --------------------- 1234 1235 -- A subunit is compiled either by itself (for semantic checking) 1236 -- or as part of compiling the parent (for code generation). In 1237 -- either case, by the time we actually process the subunit, the 1238 -- parent has already been installed and analyzed. The node N is 1239 -- a compilation unit, whose context needs to be treated here, 1240 -- because we come directly here from the parent without calling 1241 -- Analyze_Compilation_Unit. 1242 1243 -- The compilation context includes the explicit context of the 1244 -- subunit, and the context of the parent, together with the parent 1245 -- itself. In order to compile the current context, we remove the 1246 -- one inherited from the parent, in order to have a clean visibility 1247 -- table. We restore the parent context before analyzing the proper 1248 -- body itself. On exit, we remove only the explicit context of the 1249 -- subunit. 1250 1251 procedure Analyze_Subunit (N : Node_Id) is 1252 Lib_Unit : constant Node_Id := Library_Unit (N); 1253 Par_Unit : constant Entity_Id := Current_Scope; 1254 1255 Lib_Spec : Node_Id := Library_Unit (Lib_Unit); 1256 Num_Scopes : Int := 0; 1257 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id; 1258 Enclosing_Child : Entity_Id := Empty; 1259 Svg : constant Suppress_Array := Scope_Suppress; 1260 1261 procedure Analyze_Subunit_Context; 1262 -- Capture names in use clauses of the subunit. This must be done 1263 -- before re-installing parent declarations, because items in the 1264 -- context must not be hidden by declarations local to the parent. 1265 1266 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id); 1267 -- Recursive procedure to restore scope of all ancestors of subunit, 1268 -- from outermost in. If parent is not a subunit, the call to install 1269 -- context installs context of spec and (if parent is a child unit) 1270 -- the context of its parents as well. It is confusing that parents 1271 -- should be treated differently in both cases, but the semantics are 1272 -- just not identical. 1273 1274 procedure Re_Install_Use_Clauses; 1275 -- As part of the removal of the parent scope, the use clauses are 1276 -- removed, to be reinstalled when the context of the subunit has 1277 -- been analyzed. Use clauses may also have been affected by the 1278 -- analysis of the context of the subunit, so they have to be applied 1279 -- again, to insure that the compilation environment of the rest of 1280 -- the parent unit is identical. 1281 1282 procedure Remove_Scope; 1283 -- Remove current scope from scope stack, and preserve the list 1284 -- of use clauses in it, to be reinstalled after context is analyzed. 1285 1286 ------------------------------ 1287 -- Analyze_Subunit_Context -- 1288 ------------------------------ 1289 1290 procedure Analyze_Subunit_Context is 1291 Item : Node_Id; 1292 Nam : Node_Id; 1293 Unit_Name : Entity_Id; 1294 1295 begin 1296 Analyze_Context (N); 1297 Item := First (Context_Items (N)); 1298 1299 -- make withed units immediately visible. If child unit, make the 1300 -- ultimate parent immediately visible. 1301 1302 while Present (Item) loop 1303 1304 if Nkind (Item) = N_With_Clause then 1305 Unit_Name := Entity (Name (Item)); 1306 1307 while Is_Child_Unit (Unit_Name) loop 1308 Set_Is_Visible_Child_Unit (Unit_Name); 1309 Unit_Name := Scope (Unit_Name); 1310 end loop; 1311 1312 if not Is_Immediately_Visible (Unit_Name) then 1313 Set_Is_Immediately_Visible (Unit_Name); 1314 Set_Context_Installed (Item); 1315 end if; 1316 1317 elsif Nkind (Item) = N_Use_Package_Clause then 1318 Nam := First (Names (Item)); 1319 1320 while Present (Nam) loop 1321 Analyze (Nam); 1322 Next (Nam); 1323 end loop; 1324 1325 elsif Nkind (Item) = N_Use_Type_Clause then 1326 Nam := First (Subtype_Marks (Item)); 1327 1328 while Present (Nam) loop 1329 Analyze (Nam); 1330 Next (Nam); 1331 end loop; 1332 end if; 1333 1334 Next (Item); 1335 end loop; 1336 1337 Item := First (Context_Items (N)); 1338 1339 -- reset visibility of withed units. They will be made visible 1340 -- again when we install the subunit context. 1341 1342 while Present (Item) loop 1343 1344 if Nkind (Item) = N_With_Clause then 1345 Unit_Name := Entity (Name (Item)); 1346 1347 while Is_Child_Unit (Unit_Name) loop 1348 Set_Is_Visible_Child_Unit (Unit_Name, False); 1349 Unit_Name := Scope (Unit_Name); 1350 end loop; 1351 1352 if Context_Installed (Item) then 1353 Set_Is_Immediately_Visible (Unit_Name, False); 1354 Set_Context_Installed (Item, False); 1355 end if; 1356 end if; 1357 1358 Next (Item); 1359 end loop; 1360 1361 end Analyze_Subunit_Context; 1362 1363 ------------------------ 1364 -- Re_Install_Parents -- 1365 ------------------------ 1366 1367 procedure Re_Install_Parents (L : Node_Id; Scop : Entity_Id) is 1368 E : Entity_Id; 1369 1370 begin 1371 if Nkind (Unit (L)) = N_Subunit then 1372 Re_Install_Parents (Library_Unit (L), Scope (Scop)); 1373 end if; 1374 1375 Install_Context (L); 1376 1377 -- If the subunit occurs within a child unit, we must restore the 1378 -- immediate visibility of any siblings that may occur in context. 1379 1380 if Present (Enclosing_Child) then 1381 Install_Siblings (Enclosing_Child, L); 1382 end if; 1383 1384 New_Scope (Scop); 1385 1386 if Scop /= Par_Unit then 1387 Set_Is_Immediately_Visible (Scop); 1388 end if; 1389 1390 E := First_Entity (Current_Scope); 1391 1392 while Present (E) loop 1393 Set_Is_Immediately_Visible (E); 1394 Next_Entity (E); 1395 end loop; 1396 1397 -- A subunit appears within a body, and for a nested subunits 1398 -- all the parents are bodies. Restore full visibility of their 1399 -- private entities. 1400 1401 if Ekind (Scop) = E_Package then 1402 Set_In_Package_Body (Scop); 1403 Install_Private_Declarations (Scop); 1404 end if; 1405 end Re_Install_Parents; 1406 1407 ---------------------------- 1408 -- Re_Install_Use_Clauses -- 1409 ---------------------------- 1410 1411 procedure Re_Install_Use_Clauses is 1412 U : Node_Id; 1413 1414 begin 1415 for J in reverse 1 .. Num_Scopes loop 1416 U := Use_Clauses (J); 1417 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause := U; 1418 Install_Use_Clauses (U); 1419 end loop; 1420 end Re_Install_Use_Clauses; 1421 1422 ------------------ 1423 -- Remove_Scope -- 1424 ------------------ 1425 1426 procedure Remove_Scope is 1427 E : Entity_Id; 1428 1429 begin 1430 Num_Scopes := Num_Scopes + 1; 1431 Use_Clauses (Num_Scopes) := 1432 Scope_Stack.Table (Scope_Stack.Last).First_Use_Clause; 1433 E := First_Entity (Current_Scope); 1434 1435 while Present (E) loop 1436 Set_Is_Immediately_Visible (E, False); 1437 Next_Entity (E); 1438 end loop; 1439 1440 if Is_Child_Unit (Current_Scope) then 1441 Enclosing_Child := Current_Scope; 1442 end if; 1443 1444 Pop_Scope; 1445 end Remove_Scope; 1446 1447 -- Start of processing for Analyze_Subunit 1448 1449 begin 1450 if not Is_Empty_List (Context_Items (N)) then 1451 1452 -- Save current use clauses. 1453 1454 Remove_Scope; 1455 Remove_Context (Lib_Unit); 1456 1457 -- Now remove parents and their context, including enclosing 1458 -- subunits and the outer parent body which is not a subunit. 1459 1460 if Present (Lib_Spec) then 1461 Remove_Context (Lib_Spec); 1462 1463 while Nkind (Unit (Lib_Spec)) = N_Subunit loop 1464 Lib_Spec := Library_Unit (Lib_Spec); 1465 Remove_Scope; 1466 Remove_Context (Lib_Spec); 1467 end loop; 1468 1469 if Nkind (Unit (Lib_Unit)) = N_Subunit then 1470 Remove_Scope; 1471 end if; 1472 1473 if Nkind (Unit (Lib_Spec)) = N_Package_Body then 1474 Remove_Context (Library_Unit (Lib_Spec)); 1475 end if; 1476 end if; 1477 1478 Analyze_Subunit_Context; 1479 Re_Install_Parents (Lib_Unit, Par_Unit); 1480 1481 -- If the context includes a child unit of the parent of the 1482 -- subunit, the parent will have been removed from visibility, 1483 -- after compiling that cousin in the context. The visibility 1484 -- of the parent must be restored now. This also applies if the 1485 -- context includes another subunit of the same parent which in 1486 -- turn includes a child unit in its context. 1487 1488 if Ekind (Par_Unit) = E_Package then 1489 if not Is_Immediately_Visible (Par_Unit) 1490 or else (Present (First_Entity (Par_Unit)) 1491 and then not Is_Immediately_Visible 1492 (First_Entity (Par_Unit))) 1493 then 1494 Set_Is_Immediately_Visible (Par_Unit); 1495 Install_Visible_Declarations (Par_Unit); 1496 Install_Private_Declarations (Par_Unit); 1497 end if; 1498 end if; 1499 1500 Re_Install_Use_Clauses; 1501 Install_Context (N); 1502 1503 -- Restore state of suppress flags for current body. 1504 1505 Scope_Suppress := Svg; 1506 1507 -- If the subunit is within a child unit, then siblings of any 1508 -- parent unit that appear in the context clause of the subunit 1509 -- must also be made immediately visible. 1510 1511 if Present (Enclosing_Child) then 1512 Install_Siblings (Enclosing_Child, N); 1513 end if; 1514 1515 end if; 1516 1517 Analyze (Proper_Body (Unit (N))); 1518 Remove_Context (N); 1519 end Analyze_Subunit; 1520 1521 ---------------------------- 1522 -- Analyze_Task_Body_Stub -- 1523 ---------------------------- 1524 1525 procedure Analyze_Task_Body_Stub (N : Node_Id) is 1526 Nam : Entity_Id := Current_Entity_In_Scope (Defining_Identifier (N)); 1527 Loc : constant Source_Ptr := Sloc (N); 1528 1529 begin 1530 Check_Stub_Level (N); 1531 1532 -- First occurence of name may have been as an incomplete type. 1533 1534 if Present (Nam) and then Ekind (Nam) = E_Incomplete_Type then 1535 Nam := Full_View (Nam); 1536 end if; 1537 1538 if No (Nam) 1539 or else not Is_Task_Type (Etype (Nam)) 1540 then 1541 Error_Msg_N ("missing specification for task body", N); 1542 else 1543 Set_Scope (Defining_Entity (N), Current_Scope); 1544 Generate_Reference (Nam, Defining_Identifier (N), 'b'); 1545 Set_Has_Completion (Etype (Nam)); 1546 Analyze_Proper_Body (N, Etype (Nam)); 1547 1548 -- Set elaboration flag to indicate that entity is callable. 1549 -- This cannot be done in the expansion of the body itself, 1550 -- because the proper body is not in a declarative part. This 1551 -- is only done if expansion is active, because the context 1552 -- may be generic and the flag not defined yet. 1553 1554 if Expander_Active then 1555 Insert_After (N, 1556 Make_Assignment_Statement (Loc, 1557 Name => 1558 Make_Identifier (Loc, 1559 New_External_Name (Chars (Etype (Nam)), 'E')), 1560 Expression => New_Reference_To (Standard_True, Loc))); 1561 end if; 1562 1563 end if; 1564 end Analyze_Task_Body_Stub; 1565 1566 ------------------------- 1567 -- Analyze_With_Clause -- 1568 ------------------------- 1569 1570 -- Analyze the declaration of a unit in a with clause. At end, 1571 -- label the with clause with the defining entity for the unit. 1572 1573 procedure Analyze_With_Clause (N : Node_Id) is 1574 1575 -- Retrieve the original kind of the unit node, before analysis. 1576 -- If it is a subprogram instantiation, its analysis below will 1577 -- rewrite as the declaration of the wrapper package. If the same 1578 -- instantiation appears indirectly elsewhere in the context, it 1579 -- will have been analyzed already. 1580 1581 Unit_Kind : constant Node_Kind := 1582 Nkind (Original_Node (Unit (Library_Unit (N)))); 1583 1584 E_Name : Entity_Id; 1585 Par_Name : Entity_Id; 1586 Pref : Node_Id; 1587 U : Node_Id; 1588 1589 Intunit : Boolean; 1590 -- Set True if the unit currently being compiled is an internal unit 1591 1592 Save_Style_Check : constant Boolean := Opt.Style_Check; 1593 Save_C_Restrict : constant Save_Compilation_Unit_Restrictions := 1594 Compilation_Unit_Restrictions_Save; 1595 1596 begin 1597 if Limited_Present (N) then 1598 -- Ada0Y (AI-50217): Build visibility structures but do not 1599 -- analyze unit 1600 1601 Build_Limited_Views (N); 1602 return; 1603 end if; 1604 1605 -- We reset ordinary style checking during the analysis of a with'ed 1606 -- unit, but we do NOT reset GNAT special analysis mode (the latter 1607 -- definitely *does* apply to with'ed units). 1608 1609 if not GNAT_Mode then 1610 Style_Check := False; 1611 end if; 1612 1613 -- If the library unit is a predefined unit, and we are in high 1614 -- integrity mode, then temporarily reset Configurable_Run_Time_Mode 1615 -- for the analysis of the with'ed unit. This mode does not prevent 1616 -- explicit with'ing of run-time units. 1617 1618 if Configurable_Run_Time_Mode 1619 and then 1620 Is_Predefined_File_Name 1621 (Unit_File_Name (Get_Source_Unit (Unit (Library_Unit (N))))) 1622 then 1623 Configurable_Run_Time_Mode := False; 1624 Semantics (Library_Unit (N)); 1625 Configurable_Run_Time_Mode := True; 1626 1627 else 1628 Semantics (Library_Unit (N)); 1629 end if; 1630 1631 U := Unit (Library_Unit (N)); 1632 Intunit := Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit)); 1633 1634 -- Following checks are skipped for dummy packages (those supplied 1635 -- for with's where no matching file could be found). Such packages 1636 -- are identified by the Sloc value being set to No_Location 1637 1638 if Sloc (U) /= No_Location then 1639 1640 -- Check restrictions, except that we skip the check if this 1641 -- is an internal unit unless we are compiling the internal 1642 -- unit as the main unit. We also skip this for dummy packages. 1643 1644 if not Intunit or else Current_Sem_Unit = Main_Unit then 1645 Check_Restricted_Unit (Unit_Name (Get_Source_Unit (U)), N); 1646 end if; 1647 1648 -- Check for inappropriate with of internal implementation unit 1649 -- if we are currently compiling the main unit and the main unit 1650 -- is itself not an internal unit. We do not issue this message 1651 -- for implicit with's generated by the compiler itself. 1652 1653 if Implementation_Unit_Warnings 1654 and then Current_Sem_Unit = Main_Unit 1655 and then Implementation_Unit (Get_Source_Unit (U)) 1656 and then not Intunit 1657 and then not Implicit_With (N) 1658 then 1659 Error_Msg_N ("& is an internal 'G'N'A'T unit?", Name (N)); 1660 Error_Msg_N 1661 ("\use of this unit is non-portable and version-dependent?", 1662 Name (N)); 1663 end if; 1664 end if; 1665 1666 -- Semantic analysis of a generic unit is performed on a copy of 1667 -- the original tree. Retrieve the entity on which semantic info 1668 -- actually appears. 1669 1670 if Unit_Kind in N_Generic_Declaration then 1671 E_Name := Defining_Entity (U); 1672 1673 -- Note: in the following test, Unit_Kind is the original Nkind, but 1674 -- in the case of an instantiation, semantic analysis above will 1675 -- have replaced the unit by its instantiated version. If the instance 1676 -- body has been generated, the instance now denotes the body entity. 1677 -- For visibility purposes we need the entity of its spec. 1678 1679 elsif (Unit_Kind = N_Package_Instantiation 1680 or else Nkind (Original_Node (Unit (Library_Unit (N)))) = 1681 N_Package_Instantiation) 1682 and then Nkind (U) = N_Package_Body 1683 then 1684 E_Name := Corresponding_Spec (U); 1685 1686 elsif Unit_Kind = N_Package_Instantiation 1687 and then Nkind (U) = N_Package_Instantiation 1688 then 1689 -- If the instance has not been rewritten as a package declaration, 1690 -- then it appeared already in a previous with clause. Retrieve 1691 -- the entity from the previous instance. 1692 1693 E_Name := Defining_Entity (Specification (Instance_Spec (U))); 1694 1695 elsif Unit_Kind = N_Procedure_Instantiation 1696 or else Unit_Kind = N_Function_Instantiation 1697 then 1698 -- Instantiation node is replaced with a package that contains 1699 -- renaming declarations and instance itself. The subprogram 1700 -- Instance is declared in the visible part of the wrapper package. 1701 1702 E_Name := First_Entity (Defining_Entity (U)); 1703 1704 while Present (E_Name) loop 1705 exit when Is_Subprogram (E_Name) 1706 and then Is_Generic_Instance (E_Name); 1707 E_Name := Next_Entity (E_Name); 1708 end loop; 1709 1710 elsif Unit_Kind = N_Package_Renaming_Declaration 1711 or else Unit_Kind in N_Generic_Renaming_Declaration 1712 then 1713 E_Name := Defining_Entity (U); 1714 1715 elsif Unit_Kind = N_Subprogram_Body 1716 and then Nkind (Name (N)) = N_Selected_Component 1717 and then not Acts_As_Spec (Library_Unit (N)) 1718 then 1719 -- For a child unit that has no spec, one has been created and 1720 -- analyzed. The entity required is that of the spec. 1721 1722 E_Name := Corresponding_Spec (U); 1723 1724 else 1725 E_Name := Defining_Entity (U); 1726 end if; 1727 1728 if Nkind (Name (N)) = N_Selected_Component then 1729 1730 -- Child unit in a with clause 1731 1732 Change_Selected_Component_To_Expanded_Name (Name (N)); 1733 end if; 1734 1735 -- Restore style checks and restrictions 1736 1737 Style_Check := Save_Style_Check; 1738 Compilation_Unit_Restrictions_Restore (Save_C_Restrict); 1739 1740 -- Record the reference, but do NOT set the unit as referenced, we 1741 -- want to consider the unit as unreferenced if this is the only 1742 -- reference that occurs. 1743 1744 Set_Entity_With_Style_Check (Name (N), E_Name); 1745 Generate_Reference (E_Name, Name (N), 'w', Set_Ref => False); 1746 1747 if Is_Child_Unit (E_Name) then 1748 Pref := Prefix (Name (N)); 1749 Par_Name := Scope (E_Name); 1750 1751 while Nkind (Pref) = N_Selected_Component loop 1752 Change_Selected_Component_To_Expanded_Name (Pref); 1753 Set_Entity_With_Style_Check (Pref, Par_Name); 1754 1755 Generate_Reference (Par_Name, Pref); 1756 Pref := Prefix (Pref); 1757 1758 -- If E_Name is the dummy entity for a nonexistent unit, 1759 -- its scope is set to Standard_Standard, and no attempt 1760 -- should be made to further unwind scopes. 1761 1762 if Par_Name /= Standard_Standard then 1763 Par_Name := Scope (Par_Name); 1764 end if; 1765 end loop; 1766 1767 if Present (Entity (Pref)) 1768 and then not Analyzed (Parent (Parent (Entity (Pref)))) 1769 then 1770 -- If the entity is set without its unit being compiled, 1771 -- the original parent is a renaming, and Par_Name is the 1772 -- renamed entity. For visibility purposes, we need the 1773 -- original entity, which must be analyzed now, because 1774 -- Load_Unit retrieves directly the renamed unit, and the 1775 -- renaming declaration itself has not been analyzed. 1776 1777 Analyze (Parent (Parent (Entity (Pref)))); 1778 pragma Assert (Renamed_Object (Entity (Pref)) = Par_Name); 1779 Par_Name := Entity (Pref); 1780 end if; 1781 1782 Set_Entity_With_Style_Check (Pref, Par_Name); 1783 Generate_Reference (Par_Name, Pref); 1784 end if; 1785 1786 -- If the withed unit is System, and a system extension pragma is 1787 -- present, compile the extension now, rather than waiting for 1788 -- a visibility check on a specific entity. 1789 1790 if Chars (E_Name) = Name_System 1791 and then Scope (E_Name) = Standard_Standard 1792 and then Present (System_Extend_Unit) 1793 and then Present_System_Aux (N) 1794 then 1795 -- If the extension is not present, an error will have been emitted. 1796 1797 null; 1798 end if; 1799 end Analyze_With_Clause; 1800 1801 ------------------------------ 1802 -- Analyze_With_Type_Clause -- 1803 ------------------------------ 1804 1805 procedure Analyze_With_Type_Clause (N : Node_Id) is 1806 Loc : constant Source_Ptr := Sloc (N); 1807 Nam : constant Node_Id := Name (N); 1808 Pack : Node_Id; 1809 Decl : Node_Id; 1810 P : Entity_Id; 1811 Unum : Unit_Number_Type; 1812 Sel : Node_Id; 1813 1814 procedure Decorate_Tagged_Type (T : Entity_Id); 1815 -- Set basic attributes of type, including its class_wide type. 1816 1817 function In_Chain (E : Entity_Id) return Boolean; 1818 -- Check that the imported type is not already in the homonym chain, 1819 -- for example through a with_type clause in a parent unit. 1820 1821 -------------------------- 1822 -- Decorate_Tagged_Type -- 1823 -------------------------- 1824 1825 procedure Decorate_Tagged_Type (T : Entity_Id) is 1826 CW : Entity_Id; 1827 1828 begin 1829 Set_Ekind (T, E_Record_Type); 1830 Set_Is_Tagged_Type (T); 1831 Set_Etype (T, T); 1832 Set_From_With_Type (T); 1833 Set_Scope (T, P); 1834 1835 if not In_Chain (T) then 1836 Set_Homonym (T, Current_Entity (T)); 1837 Set_Current_Entity (T); 1838 end if; 1839 1840 -- Build bogus class_wide type, if not previously done. 1841 1842 if No (Class_Wide_Type (T)) then 1843 CW := Make_Defining_Identifier (Loc, New_Internal_Name ('S')); 1844 1845 Set_Ekind (CW, E_Class_Wide_Type); 1846 Set_Etype (CW, T); 1847 Set_Scope (CW, P); 1848 Set_Is_Tagged_Type (CW); 1849 Set_Is_First_Subtype (CW, True); 1850 Init_Size_Align (CW); 1851 Set_Has_Unknown_Discriminants 1852 (CW, True); 1853 Set_Class_Wide_Type (CW, CW); 1854 Set_Equivalent_Type (CW, Empty); 1855 Set_From_With_Type (CW); 1856 1857 Set_Class_Wide_Type (T, CW); 1858 end if; 1859 end Decorate_Tagged_Type; 1860 1861 -------------- 1862 -- In_Chain -- 1863 -------------- 1864 1865 function In_Chain (E : Entity_Id) return Boolean is 1866 H : Entity_Id := Current_Entity (E); 1867 1868 begin 1869 while Present (H) loop 1870 1871 if H = E then 1872 return True; 1873 else 1874 H := Homonym (H); 1875 end if; 1876 end loop; 1877 1878 return False; 1879 end In_Chain; 1880 1881 -- Start of processing for Analyze_With_Type_Clause 1882 1883 begin 1884 if Nkind (Nam) = N_Selected_Component then 1885 Pack := New_Copy_Tree (Prefix (Nam)); 1886 Sel := Selector_Name (Nam); 1887 1888 else 1889 Error_Msg_N ("illegal name for imported type", Nam); 1890 return; 1891 end if; 1892 1893 Decl := 1894 Make_Package_Declaration (Loc, 1895 Specification => 1896 (Make_Package_Specification (Loc, 1897 Defining_Unit_Name => Pack, 1898 Visible_Declarations => New_List, 1899 End_Label => Empty))); 1900 1901 Unum := 1902 Load_Unit 1903 (Load_Name => Get_Unit_Name (Decl), 1904 Required => True, 1905 Subunit => False, 1906 Error_Node => Nam); 1907 1908 if Unum = No_Unit 1909 or else Nkind (Unit (Cunit (Unum))) /= N_Package_Declaration 1910 then 1911 Error_Msg_N ("imported type must be declared in package", Nam); 1912 return; 1913 1914 elsif Unum = Current_Sem_Unit then 1915 1916 -- If type is defined in unit being analyzed, then the clause 1917 -- is redundant. 1918 1919 return; 1920 1921 else 1922 P := Cunit_Entity (Unum); 1923 end if; 1924 1925 -- Find declaration for imported type, and set its basic attributes 1926 -- if it has not been analyzed (which will be the case if there is 1927 -- circular dependence). 1928 1929 declare 1930 Decl : Node_Id; 1931 Typ : Entity_Id; 1932 1933 begin 1934 if not Analyzed (Cunit (Unum)) 1935 and then not From_With_Type (P) 1936 then 1937 Set_Ekind (P, E_Package); 1938 Set_Etype (P, Standard_Void_Type); 1939 Set_From_With_Type (P); 1940 Set_Scope (P, Standard_Standard); 1941 Set_Homonym (P, Current_Entity (P)); 1942 Set_Current_Entity (P); 1943 1944 elsif Analyzed (Cunit (Unum)) 1945 and then Is_Child_Unit (P) 1946 then 1947 -- If the child unit is already in scope, indicate that it is 1948 -- visible, and remains so after intervening calls to rtsfind. 1949 1950 Set_Is_Visible_Child_Unit (P); 1951 end if; 1952 1953 if Nkind (Parent (P)) = N_Defining_Program_Unit_Name then 1954 1955 -- Make parent packages visible. 1956 1957 declare 1958 Parent_Comp : Node_Id; 1959 Parent_Id : Entity_Id; 1960 Child : Entity_Id; 1961 1962 begin 1963 Child := P; 1964 Parent_Comp := Parent_Spec (Unit (Cunit (Unum))); 1965 1966 loop 1967 Parent_Id := Defining_Entity (Unit (Parent_Comp)); 1968 Set_Scope (Child, Parent_Id); 1969 1970 -- The type may be imported from a child unit, in which 1971 -- case the current compilation appears in the name. Do 1972 -- not change its visibility here because it will conflict 1973 -- with the subsequent normal processing. 1974 1975 if not Analyzed (Unit_Declaration_Node (Parent_Id)) 1976 and then Parent_Id /= Cunit_Entity (Current_Sem_Unit) 1977 then 1978 Set_Ekind (Parent_Id, E_Package); 1979 Set_Etype (Parent_Id, Standard_Void_Type); 1980 1981 -- The same package may appear is several with_type 1982 -- clauses. 1983 1984 if not From_With_Type (Parent_Id) then 1985 Set_Homonym (Parent_Id, Current_Entity (Parent_Id)); 1986 Set_Current_Entity (Parent_Id); 1987 Set_From_With_Type (Parent_Id); 1988 end if; 1989 end if; 1990 1991 Set_Is_Immediately_Visible (Parent_Id); 1992 1993 Child := Parent_Id; 1994 Parent_Comp := Parent_Spec (Unit (Parent_Comp)); 1995 exit when No (Parent_Comp); 1996 end loop; 1997 1998 Set_Scope (Parent_Id, Standard_Standard); 1999 end; 2000 end if; 2001 2002 -- Even if analyzed, the package may not be currently visible. It 2003 -- must be while the with_type clause is active. 2004 2005 Set_Is_Immediately_Visible (P); 2006 2007 Decl := 2008 First (Visible_Declarations (Specification (Unit (Cunit (Unum))))); 2009 2010 while Present (Decl) loop 2011 2012 if Nkind (Decl) = N_Full_Type_Declaration 2013 and then Chars (Defining_Identifier (Decl)) = Chars (Sel) 2014 then 2015 Typ := Defining_Identifier (Decl); 2016 2017 if Tagged_Present (N) then 2018 2019 -- The declaration must indicate that this is a tagged 2020 -- type or a type extension. 2021 2022 if (Nkind (Type_Definition (Decl)) = N_Record_Definition 2023 and then Tagged_Present (Type_Definition (Decl))) 2024 or else 2025 (Nkind (Type_Definition (Decl)) 2026 = N_Derived_Type_Definition 2027 and then Present 2028 (Record_Extension_Part (Type_Definition (Decl)))) 2029 then 2030 null; 2031 else 2032 Error_Msg_N ("imported type is not a tagged type", Nam); 2033 return; 2034 end if; 2035 2036 if not Analyzed (Decl) then 2037 2038 -- Unit is not currently visible. Add basic attributes 2039 -- to type and build its class-wide type. 2040 2041 Init_Size_Align (Typ); 2042 Decorate_Tagged_Type (Typ); 2043 end if; 2044 2045 else 2046 if Nkind (Type_Definition (Decl)) 2047 /= N_Access_To_Object_Definition 2048 then 2049 Error_Msg_N 2050 ("imported type is not an access type", Nam); 2051 2052 elsif not Analyzed (Decl) then 2053 Set_Ekind (Typ, E_Access_Type); 2054 Set_Etype (Typ, Typ); 2055 Set_Scope (Typ, P); 2056 Init_Size (Typ, System_Address_Size); 2057 Init_Alignment (Typ); 2058 Set_Directly_Designated_Type (Typ, Standard_Integer); 2059 Set_From_With_Type (Typ); 2060 2061 if not In_Chain (Typ) then 2062 Set_Homonym (Typ, Current_Entity (Typ)); 2063 Set_Current_Entity (Typ); 2064 end if; 2065 end if; 2066 end if; 2067 2068 Set_Entity (Sel, Typ); 2069 return; 2070 2071 elsif ((Nkind (Decl) = N_Private_Type_Declaration 2072 and then Tagged_Present (Decl)) 2073 or else (Nkind (Decl) = N_Private_Extension_Declaration)) 2074 and then Chars (Defining_Identifier (Decl)) = Chars (Sel) 2075 then 2076 Typ := Defining_Identifier (Decl); 2077 2078 if not Tagged_Present (N) then 2079 Error_Msg_N ("type must be declared tagged", N); 2080 2081 elsif not Analyzed (Decl) then 2082 Decorate_Tagged_Type (Typ); 2083 end if; 2084 2085 Set_Entity (Sel, Typ); 2086 Set_From_With_Type (Typ); 2087 return; 2088 end if; 2089 2090 Decl := Next (Decl); 2091 end loop; 2092 2093 Error_Msg_NE ("not a visible access or tagged type in&", Nam, P); 2094 end; 2095 end Analyze_With_Type_Clause; 2096 2097 ----------------------------- 2098 -- Check_With_Type_Clauses -- 2099 ----------------------------- 2100 2101 procedure Check_With_Type_Clauses (N : Node_Id) is 2102 Lib_Unit : constant Node_Id := Unit (N); 2103 2104 procedure Check_Parent_Context (U : Node_Id); 2105 -- Examine context items of parent unit to locate with_type clauses. 2106 2107 -------------------------- 2108 -- Check_Parent_Context -- 2109 -------------------------- 2110 2111 procedure Check_Parent_Context (U : Node_Id) is 2112 Item : Node_Id; 2113 2114 begin 2115 Item := First (Context_Items (U)); 2116 while Present (Item) loop 2117 if Nkind (Item) = N_With_Type_Clause 2118 and then not Error_Posted (Item) 2119 and then 2120 From_With_Type (Scope (Entity (Selector_Name (Name (Item))))) 2121 then 2122 Error_Msg_Sloc := Sloc (Item); 2123 Error_Msg_N ("Missing With_Clause for With_Type_Clause#", N); 2124 end if; 2125 2126 Next (Item); 2127 end loop; 2128 end Check_Parent_Context; 2129 2130 -- Start of processing for Check_With_Type_Clauses 2131 2132 begin 2133 if Extensions_Allowed 2134 and then (Nkind (Lib_Unit) = N_Package_Body 2135 or else Nkind (Lib_Unit) = N_Subprogram_Body) 2136 then 2137 Check_Parent_Context (Library_Unit (N)); 2138 if Is_Child_Spec (Unit (Library_Unit (N))) then 2139 Check_Parent_Context (Parent_Spec (Unit (Library_Unit (N)))); 2140 end if; 2141 end if; 2142 end Check_With_Type_Clauses; 2143 2144 ------------------------------ 2145 -- Check_Private_Child_Unit -- 2146 ------------------------------ 2147 2148 procedure Check_Private_Child_Unit (N : Node_Id) is 2149 Lib_Unit : constant Node_Id := Unit (N); 2150 Item : Node_Id; 2151 Curr_Unit : Entity_Id; 2152 Sub_Parent : Node_Id; 2153 Priv_Child : Entity_Id; 2154 Par_Lib : Entity_Id; 2155 Par_Spec : Node_Id; 2156 2157 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean; 2158 -- Returns true if and only if the library unit is declared with 2159 -- an explicit designation of private. 2160 2161 function Is_Private_Library_Unit (Unit : Entity_Id) return Boolean is 2162 Comp_Unit : constant Node_Id := Parent (Unit_Declaration_Node (Unit)); 2163 2164 begin 2165 return Private_Present (Comp_Unit); 2166 end Is_Private_Library_Unit; 2167 2168 -- Start of processing for Check_Private_Child_Unit 2169 2170 begin 2171 if Nkind (Lib_Unit) = N_Package_Body 2172 or else Nkind (Lib_Unit) = N_Subprogram_Body 2173 then 2174 Curr_Unit := Defining_Entity (Unit (Library_Unit (N))); 2175 Par_Lib := Curr_Unit; 2176 2177 elsif Nkind (Lib_Unit) = N_Subunit then 2178 2179 -- The parent is itself a body. The parent entity is to be found 2180 -- in the corresponding spec. 2181 2182 Sub_Parent := Library_Unit (N); 2183 Curr_Unit := Defining_Entity (Unit (Library_Unit (Sub_Parent))); 2184 2185 -- If the parent itself is a subunit, Curr_Unit is the entity 2186 -- of the enclosing body, retrieve the spec entity which is 2187 -- the proper ancestor we need for the following tests. 2188 2189 if Ekind (Curr_Unit) = E_Package_Body then 2190 Curr_Unit := Spec_Entity (Curr_Unit); 2191 end if; 2192 2193 Par_Lib := Curr_Unit; 2194 2195 else 2196 Curr_Unit := Defining_Entity (Lib_Unit); 2197 2198 Par_Lib := Curr_Unit; 2199 Par_Spec := Parent_Spec (Lib_Unit); 2200 2201 if No (Par_Spec) then 2202 Par_Lib := Empty; 2203 else 2204 Par_Lib := Defining_Entity (Unit (Par_Spec)); 2205 end if; 2206 end if; 2207 2208 -- Loop through context items 2209 2210 Item := First (Context_Items (N)); 2211 while Present (Item) loop 2212 2213 if Nkind (Item) = N_With_Clause 2214 and then not Implicit_With (Item) 2215 and then Is_Private_Descendant (Entity (Name (Item))) 2216 then 2217 Priv_Child := Entity (Name (Item)); 2218 2219 declare 2220 Curr_Parent : Entity_Id := Par_Lib; 2221 Child_Parent : Entity_Id := Scope (Priv_Child); 2222 Prv_Ancestor : Entity_Id := Child_Parent; 2223 Curr_Private : Boolean := Is_Private_Library_Unit (Curr_Unit); 2224 2225 begin 2226 -- If the child unit is a public child then locate 2227 -- the nearest private ancestor; Child_Parent will 2228 -- then be set to the parent of that ancestor. 2229 2230 if not Is_Private_Library_Unit (Priv_Child) then 2231 while Present (Prv_Ancestor) 2232 and then not Is_Private_Library_Unit (Prv_Ancestor) 2233 loop 2234 Prv_Ancestor := Scope (Prv_Ancestor); 2235 end loop; 2236 2237 if Present (Prv_Ancestor) then 2238 Child_Parent := Scope (Prv_Ancestor); 2239 end if; 2240 end if; 2241 2242 while Present (Curr_Parent) 2243 and then Curr_Parent /= Standard_Standard 2244 and then Curr_Parent /= Child_Parent 2245 loop 2246 Curr_Private := 2247 Curr_Private or else Is_Private_Library_Unit (Curr_Parent); 2248 Curr_Parent := Scope (Curr_Parent); 2249 end loop; 2250 2251 if not Present (Curr_Parent) then 2252 Curr_Parent := Standard_Standard; 2253 end if; 2254 2255 if Curr_Parent /= Child_Parent then 2256 2257 if Ekind (Priv_Child) = E_Generic_Package 2258 and then Chars (Priv_Child) in Text_IO_Package_Name 2259 and then Chars (Scope (Scope (Priv_Child))) = Name_Ada 2260 then 2261 Error_Msg_NE 2262 ("& is a nested package, not a compilation unit", 2263 Name (Item), Priv_Child); 2264 2265 else 2266 Error_Msg_N 2267 ("unit in with clause is private child unit!", Item); 2268 Error_Msg_NE 2269 ("current unit must also have parent&!", 2270 Item, Child_Parent); 2271 end if; 2272 2273 elsif not Curr_Private 2274 and then Nkind (Lib_Unit) /= N_Package_Body 2275 and then Nkind (Lib_Unit) /= N_Subprogram_Body 2276 and then Nkind (Lib_Unit) /= N_Subunit 2277 then 2278 Error_Msg_NE 2279 ("current unit must also be private descendant of&", 2280 Item, Child_Parent); 2281 end if; 2282 end; 2283 end if; 2284 2285 Next (Item); 2286 end loop; 2287 2288 end Check_Private_Child_Unit; 2289 2290 ---------------------- 2291 -- Check_Stub_Level -- 2292 ---------------------- 2293 2294 procedure Check_Stub_Level (N : Node_Id) is 2295 Par : constant Node_Id := Parent (N); 2296 Kind : constant Node_Kind := Nkind (Par); 2297 2298 begin 2299 if (Kind = N_Package_Body 2300 or else Kind = N_Subprogram_Body 2301 or else Kind = N_Task_Body 2302 or else Kind = N_Protected_Body) 2303 2304 and then (Nkind (Parent (Par)) = N_Compilation_Unit 2305 or else Nkind (Parent (Par)) = N_Subunit) 2306 then 2307 null; 2308 2309 -- In an instance, a missing stub appears at any level. A warning 2310 -- message will have been emitted already for the missing file. 2311 2312 elsif not In_Instance then 2313 Error_Msg_N ("stub cannot appear in an inner scope", N); 2314 2315 elsif Expander_Active then 2316 Error_Msg_N ("missing proper body", N); 2317 end if; 2318 end Check_Stub_Level; 2319 2320 ------------------------ 2321 -- Expand_With_Clause -- 2322 ------------------------ 2323 2324 procedure Expand_With_Clause (Nam : Node_Id; N : Node_Id) is 2325 Loc : constant Source_Ptr := Sloc (Nam); 2326 Ent : constant Entity_Id := Entity (Nam); 2327 Withn : Node_Id; 2328 P : Node_Id; 2329 2330 function Build_Unit_Name (Nam : Node_Id) return Node_Id; 2331 2332 function Build_Unit_Name (Nam : Node_Id) return Node_Id is 2333 Result : Node_Id; 2334 2335 begin 2336 if Nkind (Nam) = N_Identifier then 2337 return New_Occurrence_Of (Entity (Nam), Loc); 2338 2339 else 2340 Result := 2341 Make_Expanded_Name (Loc, 2342 Chars => Chars (Entity (Nam)), 2343 Prefix => Build_Unit_Name (Prefix (Nam)), 2344 Selector_Name => New_Occurrence_Of (Entity (Nam), Loc)); 2345 Set_Entity (Result, Entity (Nam)); 2346 return Result; 2347 end if; 2348 end Build_Unit_Name; 2349 2350 begin 2351 New_Nodes_OK := New_Nodes_OK + 1; 2352 Withn := 2353 Make_With_Clause (Loc, Name => Build_Unit_Name (Nam)); 2354 2355 P := Parent (Unit_Declaration_Node (Ent)); 2356 Set_Library_Unit (Withn, P); 2357 Set_Corresponding_Spec (Withn, Ent); 2358 Set_First_Name (Withn, True); 2359 Set_Implicit_With (Withn, True); 2360 2361 Prepend (Withn, Context_Items (N)); 2362 Mark_Rewrite_Insertion (Withn); 2363 Install_Withed_Unit (Withn); 2364 2365 if Nkind (Nam) = N_Expanded_Name then 2366 Expand_With_Clause (Prefix (Nam), N); 2367 end if; 2368 2369 New_Nodes_OK := New_Nodes_OK - 1; 2370 end Expand_With_Clause; 2371 2372 -------------------------------- 2373 -- Expand_Limited_With_Clause -- 2374 -------------------------------- 2375 2376 procedure Expand_Limited_With_Clause (Nam : Node_Id; N : Node_Id) is 2377 Loc : constant Source_Ptr := Sloc (Nam); 2378 Unum : Unit_Number_Type; 2379 Withn : Node_Id; 2380 2381 begin 2382 New_Nodes_OK := New_Nodes_OK + 1; 2383 2384 if Nkind (Nam) = N_Identifier then 2385 Withn := 2386 Make_With_Clause (Loc, Name => Nam); 2387 Set_Limited_Present (Withn); 2388 Set_First_Name (Withn); 2389 Set_Implicit_With (Withn); 2390 2391 -- Load the corresponding parent unit 2392 2393 Unum := 2394 Load_Unit 2395 (Load_Name => Get_Spec_Name (Get_Unit_Name (Nam)), 2396 Required => True, 2397 Subunit => False, 2398 Error_Node => Nam); 2399 2400 if not Analyzed (Cunit (Unum)) then 2401 Set_Library_Unit (Withn, Cunit (Unum)); 2402 Set_Corresponding_Spec 2403 (Withn, Specification (Unit (Cunit (Unum)))); 2404 2405 Prepend (Withn, Context_Items (Parent (N))); 2406 Mark_Rewrite_Insertion (Withn); 2407 end if; 2408 2409 elsif Nkind (Nam) = N_Selected_Component then 2410 Withn := 2411 Make_With_Clause 2412 (Loc, 2413 Name => 2414 Make_Selected_Component 2415 (Loc, 2416 Prefix => Prefix (Nam), 2417 Selector_Name => Selector_Name (Nam))); 2418 2419 Set_Parent (Withn, Parent (N)); 2420 Set_Limited_Present (Withn); 2421 Set_First_Name (Withn); 2422 Set_Implicit_With (Withn); 2423 2424 Unum := 2425 Load_Unit 2426 (Load_Name => Get_Spec_Name (Get_Unit_Name (Nam)), 2427 Required => True, 2428 Subunit => False, 2429 Error_Node => Nam); 2430 2431 if not Analyzed (Cunit (Unum)) then 2432 Set_Library_Unit (Withn, Cunit (Unum)); 2433 Set_Corresponding_Spec 2434 (Withn, Specification (Unit (Cunit (Unum)))); 2435 Prepend (Withn, Context_Items (Parent (N))); 2436 Mark_Rewrite_Insertion (Withn); 2437 2438 Expand_Limited_With_Clause (Prefix (Nam), N); 2439 end if; 2440 2441 else 2442 null; 2443 pragma Assert (False); 2444 end if; 2445 2446 New_Nodes_OK := New_Nodes_OK - 1; 2447 end Expand_Limited_With_Clause; 2448 2449 ----------------------- 2450 -- Get_Parent_Entity -- 2451 ----------------------- 2452 2453 function Get_Parent_Entity (Unit : Node_Id) return Entity_Id is 2454 begin 2455 if Nkind (Unit) = N_Package_Instantiation then 2456 return Defining_Entity (Specification (Instance_Spec (Unit))); 2457 else 2458 return Defining_Entity (Unit); 2459 end if; 2460 end Get_Parent_Entity; 2461 2462 ----------------------------- 2463 -- Implicit_With_On_Parent -- 2464 ----------------------------- 2465 2466 procedure Implicit_With_On_Parent 2467 (Child_Unit : Node_Id; 2468 N : Node_Id) 2469 is 2470 Loc : constant Source_Ptr := Sloc (N); 2471 P : constant Node_Id := Parent_Spec (Child_Unit); 2472 P_Unit : constant Node_Id := Unit (P); 2473 P_Name : constant Entity_Id := Get_Parent_Entity (P_Unit); 2474 Withn : Node_Id; 2475 2476 function Build_Ancestor_Name (P : Node_Id) return Node_Id; 2477 -- Build prefix of child unit name. Recurse if needed. 2478 2479 function Build_Unit_Name return Node_Id; 2480 -- If the unit is a child unit, build qualified name with all 2481 -- ancestors. 2482 2483 ------------------------- 2484 -- Build_Ancestor_Name -- 2485 ------------------------- 2486 2487 function Build_Ancestor_Name (P : Node_Id) return Node_Id is 2488 P_Ref : constant Node_Id := 2489 New_Reference_To (Defining_Entity (P), Loc); 2490 2491 begin 2492 if No (Parent_Spec (P)) then 2493 return P_Ref; 2494 else 2495 return 2496 Make_Selected_Component (Loc, 2497 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P))), 2498 Selector_Name => P_Ref); 2499 end if; 2500 end Build_Ancestor_Name; 2501 2502 --------------------- 2503 -- Build_Unit_Name -- 2504 --------------------- 2505 2506 function Build_Unit_Name return Node_Id is 2507 Result : Node_Id; 2508 2509 begin 2510 if No (Parent_Spec (P_Unit)) then 2511 return New_Reference_To (P_Name, Loc); 2512 else 2513 Result := 2514 Make_Expanded_Name (Loc, 2515 Chars => Chars (P_Name), 2516 Prefix => Build_Ancestor_Name (Unit (Parent_Spec (P_Unit))), 2517 Selector_Name => New_Reference_To (P_Name, Loc)); 2518 Set_Entity (Result, P_Name); 2519 return Result; 2520 end if; 2521 end Build_Unit_Name; 2522 2523 -- Start of processing for Implicit_With_On_Parent 2524 2525 begin 2526 New_Nodes_OK := New_Nodes_OK + 1; 2527 Withn := Make_With_Clause (Loc, Name => Build_Unit_Name); 2528 2529 Set_Library_Unit (Withn, P); 2530 Set_Corresponding_Spec (Withn, P_Name); 2531 Set_First_Name (Withn, True); 2532 Set_Implicit_With (Withn, True); 2533 2534 -- Node is placed at the beginning of the context items, so that 2535 -- subsequent use clauses on the parent can be validated. 2536 2537 Prepend (Withn, Context_Items (N)); 2538 Mark_Rewrite_Insertion (Withn); 2539 Install_Withed_Unit (Withn); 2540 2541 if Is_Child_Spec (P_Unit) then 2542 Implicit_With_On_Parent (P_Unit, N); 2543 end if; 2544 New_Nodes_OK := New_Nodes_OK - 1; 2545 end Implicit_With_On_Parent; 2546 2547 --------------------- 2548 -- Install_Context -- 2549 --------------------- 2550 2551 procedure Install_Context (N : Node_Id) is 2552 Lib_Unit : constant Node_Id := Unit (N); 2553 2554 begin 2555 Install_Context_Clauses (N); 2556 2557 if Is_Child_Spec (Lib_Unit) then 2558 Install_Parents (Lib_Unit, Private_Present (Parent (Lib_Unit))); 2559 end if; 2560 2561 Install_Limited_Context_Clauses (N); 2562 2563 Check_With_Type_Clauses (N); 2564 end Install_Context; 2565 2566 ----------------------------- 2567 -- Install_Context_Clauses -- 2568 ----------------------------- 2569 2570 procedure Install_Context_Clauses (N : Node_Id) is 2571 Lib_Unit : constant Node_Id := Unit (N); 2572 Item : Node_Id; 2573 Uname_Node : Entity_Id; 2574 Check_Private : Boolean := False; 2575 Decl_Node : Node_Id; 2576 Lib_Parent : Entity_Id; 2577 2578 begin 2579 -- Loop through context clauses to find the with/use clauses. 2580 -- This is done twice, first for everything except limited_with 2581 -- clauses, and then for those, if any are present. 2582 2583 Item := First (Context_Items (N)); 2584 while Present (Item) loop 2585 2586 -- Case of explicit WITH clause 2587 2588 if Nkind (Item) = N_With_Clause 2589 and then not Implicit_With (Item) 2590 then 2591 if Limited_Present (Item) then 2592 2593 -- Limited withed units will be installed later. 2594 2595 goto Continue; 2596 2597 -- If Name (Item) is not an entity name, something is wrong, and 2598 -- this will be detected in due course, for now ignore the item 2599 2600 elsif not Is_Entity_Name (Name (Item)) then 2601 goto Continue; 2602 2603 elsif No (Entity (Name (Item))) then 2604 Set_Entity (Name (Item), Any_Id); 2605 goto Continue; 2606 end if; 2607 2608 Uname_Node := Entity (Name (Item)); 2609 2610 if Is_Private_Descendant (Uname_Node) then 2611 Check_Private := True; 2612 end if; 2613 2614 Install_Withed_Unit (Item); 2615 2616 Decl_Node := Unit_Declaration_Node (Uname_Node); 2617 2618 -- If the unit is a subprogram instance, it appears nested 2619 -- within a package that carries the parent information. 2620 2621 if Is_Generic_Instance (Uname_Node) 2622 and then Ekind (Uname_Node) /= E_Package 2623 then 2624 Decl_Node := Parent (Parent (Decl_Node)); 2625 end if; 2626 2627 if Is_Child_Spec (Decl_Node) then 2628 if Nkind (Name (Item)) = N_Expanded_Name then 2629 Expand_With_Clause (Prefix (Name (Item)), N); 2630 else 2631 -- if not an expanded name, the child unit must be a 2632 -- renaming, nothing to do. 2633 2634 null; 2635 end if; 2636 2637 elsif Nkind (Decl_Node) = N_Subprogram_Body 2638 and then not Acts_As_Spec (Parent (Decl_Node)) 2639 and then Is_Child_Spec (Unit (Library_Unit (Parent (Decl_Node)))) 2640 then 2641 Implicit_With_On_Parent 2642 (Unit (Library_Unit (Parent (Decl_Node))), N); 2643 end if; 2644 2645 -- Check license conditions unless this is a dummy unit 2646 2647 if Sloc (Library_Unit (Item)) /= No_Location then 2648 License_Check : declare 2649 Withl : constant License_Type := 2650 License (Source_Index 2651 (Get_Source_Unit 2652 (Library_Unit (Item)))); 2653 2654 Unitl : constant License_Type := 2655 License (Source_Index (Current_Sem_Unit)); 2656 2657 procedure License_Error; 2658 -- Signal error of bad license 2659 2660 ------------------- 2661 -- License_Error -- 2662 ------------------- 2663 2664 procedure License_Error is 2665 begin 2666 Error_Msg_N 2667 ("?license of with'ed unit & is incompatible", 2668 Name (Item)); 2669 end License_Error; 2670 2671 -- Start of processing for License_Check 2672 2673 begin 2674 case Unitl is 2675 when Unknown => 2676 null; 2677 2678 when Restricted => 2679 if Withl = GPL then 2680 License_Error; 2681 end if; 2682 2683 when GPL => 2684 if Withl = Restricted then 2685 License_Error; 2686 end if; 2687 2688 when Modified_GPL => 2689 if Withl = Restricted or else Withl = GPL then 2690 License_Error; 2691 end if; 2692 2693 when Unrestricted => 2694 null; 2695 end case; 2696 end License_Check; 2697 end if; 2698 2699 -- Case of USE PACKAGE clause 2700 2701 elsif Nkind (Item) = N_Use_Package_Clause then 2702 Analyze_Use_Package (Item); 2703 2704 -- Case of USE TYPE clause 2705 2706 elsif Nkind (Item) = N_Use_Type_Clause then 2707 Analyze_Use_Type (Item); 2708 2709 -- Case of WITH TYPE clause 2710 2711 -- A With_Type_Clause is processed when installing the context, 2712 -- because it is a visibility mechanism and does not create a 2713 -- semantic dependence on other units, as a With_Clause does. 2714 2715 elsif Nkind (Item) = N_With_Type_Clause then 2716 Analyze_With_Type_Clause (Item); 2717 2718 -- case of PRAGMA 2719 2720 elsif Nkind (Item) = N_Pragma then 2721 Analyze (Item); 2722 end if; 2723 2724 <<Continue>> 2725 Next (Item); 2726 end loop; 2727 2728 if Is_Child_Spec (Lib_Unit) then 2729 2730 -- The unit also has implicit withs on its own parents 2731 2732 if No (Context_Items (N)) then 2733 Set_Context_Items (N, New_List); 2734 end if; 2735 2736 Implicit_With_On_Parent (Lib_Unit, N); 2737 end if; 2738 2739 -- If the unit is a body, the context of the specification must also 2740 -- be installed. 2741 2742 if Nkind (Lib_Unit) = N_Package_Body 2743 or else (Nkind (Lib_Unit) = N_Subprogram_Body 2744 and then not Acts_As_Spec (N)) 2745 then 2746 Install_Context (Library_Unit (N)); 2747 2748 if Is_Child_Spec (Unit (Library_Unit (N))) then 2749 2750 -- If the unit is the body of a public child unit, the private 2751 -- declarations of the parent must be made visible. If the child 2752 -- unit is private, the private declarations have been installed 2753 -- already in the call to Install_Parents for the spec. Installing 2754 -- private declarations must be done for all ancestors of public 2755 -- child units. In addition, sibling units mentioned in the 2756 -- context clause of the body are directly visible. 2757 2758 declare 2759 Lib_Spec : Node_Id := Unit (Library_Unit (N)); 2760 P : Node_Id; 2761 P_Name : Entity_Id; 2762 2763 begin 2764 while Is_Child_Spec (Lib_Spec) loop 2765 P := Unit (Parent_Spec (Lib_Spec)); 2766 2767 if not (Private_Present (Parent (Lib_Spec))) then 2768 P_Name := Defining_Entity (P); 2769 Install_Private_Declarations (P_Name); 2770 Set_Use (Private_Declarations (Specification (P))); 2771 end if; 2772 2773 Lib_Spec := P; 2774 end loop; 2775 end; 2776 end if; 2777 2778 -- For a package body, children in context are immediately visible 2779 2780 Install_Siblings (Defining_Entity (Unit (Library_Unit (N))), N); 2781 end if; 2782 2783 if Nkind (Lib_Unit) = N_Generic_Package_Declaration 2784 or else Nkind (Lib_Unit) = N_Generic_Subprogram_Declaration 2785 or else Nkind (Lib_Unit) = N_Package_Declaration 2786 or else Nkind (Lib_Unit) = N_Subprogram_Declaration 2787 then 2788 if Is_Child_Spec (Lib_Unit) then 2789 Lib_Parent := Defining_Entity (Unit (Parent_Spec (Lib_Unit))); 2790 Set_Is_Private_Descendant 2791 (Defining_Entity (Lib_Unit), 2792 Is_Private_Descendant (Lib_Parent) 2793 or else Private_Present (Parent (Lib_Unit))); 2794 2795 else 2796 Set_Is_Private_Descendant 2797 (Defining_Entity (Lib_Unit), 2798 Private_Present (Parent (Lib_Unit))); 2799 end if; 2800 end if; 2801 2802 if Check_Private then 2803 Check_Private_Child_Unit (N); 2804 end if; 2805 end Install_Context_Clauses; 2806 2807 ------------------------------------- 2808 -- Install_Limited_Context_Clauses -- 2809 ------------------------------------- 2810 2811 procedure Install_Limited_Context_Clauses (N : Node_Id) is 2812 Item : Node_Id; 2813 2814 procedure Check_Parent (P : Node_Id; W : Node_Id); 2815 -- Check that the unlimited view of a given compilation_unit is not 2816 -- already visible in the parents (neither immediately through the 2817 -- context clauses, nor indirectly through "use + renamings"). 2818 2819 procedure Check_Private_Limited_Withed_Unit (N : Node_Id); 2820 -- Check that if a limited_with clause of a given compilation_unit 2821 -- mentions a private child of some library unit, then the given 2822 -- compilation_unit shall be the declaration of a private descendant 2823 -- of that library unit. 2824 2825 procedure Check_Withed_Unit (W : Node_Id); 2826 -- Check that a limited with_clause does not appear in the same 2827 -- context_clause as a nonlimited with_clause that mentions 2828 -- the same library. 2829 2830 -------------------- 2831 -- Check_Parent -- 2832 -------------------- 2833 2834 procedure Check_Parent (P : Node_Id; W : Node_Id) is 2835 Item : Node_Id; 2836 Spec : Node_Id; 2837 WEnt : Entity_Id; 2838 Nam : Node_Id; 2839 E : Entity_Id; 2840 E2 : Entity_Id; 2841 2842 begin 2843 pragma Assert (Nkind (W) = N_With_Clause); 2844 2845 -- Step 1: Check if the unlimited view is installed in the parent 2846 2847 Item := First (Context_Items (P)); 2848 while Present (Item) loop 2849 if Nkind (Item) = N_With_Clause 2850 and then not Limited_Present (Item) 2851 and then not Implicit_With (Item) 2852 and then Library_Unit (Item) = Library_Unit (W) 2853 then 2854 Error_Msg_N ("unlimited view visible in ancestor", W); 2855 return; 2856 end if; 2857 2858 Next (Item); 2859 end loop; 2860 2861 -- Step 2: Check "use + renamings" 2862 2863 WEnt := Defining_Unit_Name (Specification (Unit (Library_Unit (W)))); 2864 Spec := Specification (Unit (P)); 2865 2866 -- We tried to traverse the list of entities corresponding to the 2867 -- defining entity of the package spec. However, first_entity was 2868 -- found to be 'empty'. Don't know why??? 2869 2870 -- Def := Defining_Unit_Name (Spec); 2871 -- Ent := First_Entity (Def); 2872 2873 -- As a workaround we traverse the list of visible declarations ??? 2874 2875 Item := First (Visible_Declarations (Spec)); 2876 while Present (Item) loop 2877 2878 if Nkind (Item) = N_Use_Package_Clause then 2879 2880 -- Traverse the list of packages 2881 2882 Nam := First (Names (Item)); 2883 2884 while Present (Nam) loop 2885 E := Entity (Nam); 2886 2887 pragma Assert (Present (Parent (E))); 2888 2889 if Nkind (Parent (E)) 2890 = N_Package_Renaming_Declaration 2891 and then Renamed_Entity (E) = WEnt 2892 then 2893 Error_Msg_N ("unlimited view visible through " 2894 & "use_clause + renamings", W); 2895 return; 2896 2897 elsif Nkind (Parent (E)) = N_Package_Specification then 2898 2899 -- The use clause may refer to a local package. 2900 -- Check all the enclosing scopes. 2901 2902 E2 := E; 2903 while E2 /= Standard_Standard 2904 and then E2 /= WEnt loop 2905 E2 := Scope (E2); 2906 end loop; 2907 2908 if E2 = WEnt then 2909 Error_Msg_N ("unlimited view visible through " 2910 & "use_clause ", W); 2911 return; 2912 end if; 2913 2914 end if; 2915 Next (Nam); 2916 end loop; 2917 2918 end if; 2919 2920 Next (Item); 2921 end loop; 2922 2923 -- Recursive call to check all the ancestors 2924 2925 if Is_Child_Spec (Unit (P)) then 2926 Check_Parent (P => Parent_Spec (Unit (P)), W => W); 2927 end if; 2928 end Check_Parent; 2929 2930 --------------------------------------- 2931 -- Check_Private_Limited_Withed_Unit -- 2932 --------------------------------------- 2933 2934 procedure Check_Private_Limited_Withed_Unit (N : Node_Id) is 2935 C : Node_Id; 2936 P : Node_Id; 2937 Found : Boolean := False; 2938 2939 begin 2940 -- If the current compilation unit is not private we don't 2941 -- need to check anything else. 2942 2943 if not Private_Present (Parent (N)) then 2944 Found := False; 2945 2946 else 2947 -- Compilation unit of the parent of the withed library unit 2948 2949 P := Parent_Spec (Unit (Library_Unit (N))); 2950 2951 -- Traverse all the ancestors of the current compilation 2952 -- unit to check if it is a descendant of named library unit. 2953 2954 C := Parent (N); 2955 while Present (Parent_Spec (Unit (C))) loop 2956 C := Parent_Spec (Unit (C)); 2957 2958 if C = P then 2959 Found := True; 2960 exit; 2961 end if; 2962 end loop; 2963 end if; 2964 2965 if not Found then 2966 Error_Msg_N ("current unit is not a private descendant" 2967 & " of the withed unit ('R'M 10.1.2(8)", N); 2968 end if; 2969 end Check_Private_Limited_Withed_Unit; 2970 2971 ----------------------- 2972 -- Check_Withed_Unit -- 2973 ----------------------- 2974 2975 procedure Check_Withed_Unit (W : Node_Id) is 2976 Item : Node_Id; 2977 2978 begin 2979 -- A limited with_clause can not appear in the same context_clause 2980 -- as a nonlimited with_clause which mentions the same library. 2981 2982 Item := First (Context_Items (N)); 2983 while Present (Item) loop 2984 if Nkind (Item) = N_With_Clause 2985 and then not Limited_Present (Item) 2986 and then not Implicit_With (Item) 2987 and then Library_Unit (Item) = Library_Unit (W) 2988 then 2989 Error_Msg_N ("limited and unlimited view " 2990 & "not allowed in the same context clauses", W); 2991 return; 2992 end if; 2993 2994 Next (Item); 2995 end loop; 2996 end Check_Withed_Unit; 2997 2998 -- Start of processing for Install_Limited_Context_Clauses 2999 3000 begin 3001 Item := First (Context_Items (N)); 3002 while Present (Item) loop 3003 if Nkind (Item) = N_With_Clause 3004 and then Limited_Present (Item) 3005 then 3006 3007 Check_Withed_Unit (Item); 3008 3009 if Private_Present (Library_Unit (Item)) then 3010 Check_Private_Limited_Withed_Unit (Item); 3011 end if; 3012 3013 if Is_Child_Spec (Unit (N)) then 3014 Check_Parent (Parent_Spec (Unit (N)), Item); 3015 end if; 3016 3017 Install_Limited_Withed_Unit (Item); 3018 end if; 3019 3020 Next (Item); 3021 end loop; 3022 end Install_Limited_Context_Clauses; 3023 3024 --------------------- 3025 -- Install_Parents -- 3026 --------------------- 3027 3028 procedure Install_Parents (Lib_Unit : Node_Id; Is_Private : Boolean) is 3029 P : Node_Id; 3030 E_Name : Entity_Id; 3031 P_Name : Entity_Id; 3032 P_Spec : Node_Id; 3033 3034 begin 3035 P := Unit (Parent_Spec (Lib_Unit)); 3036 P_Name := Get_Parent_Entity (P); 3037 3038 if Etype (P_Name) = Any_Type then 3039 return; 3040 end if; 3041 3042 if Ekind (P_Name) = E_Generic_Package 3043 and then Nkind (Lib_Unit) /= N_Generic_Subprogram_Declaration 3044 and then Nkind (Lib_Unit) /= N_Generic_Package_Declaration 3045 and then Nkind (Lib_Unit) not in N_Generic_Renaming_Declaration 3046 then 3047 Error_Msg_N 3048 ("child of a generic package must be a generic unit", Lib_Unit); 3049 3050 elsif not Is_Package (P_Name) then 3051 Error_Msg_N 3052 ("parent unit must be package or generic package", Lib_Unit); 3053 raise Unrecoverable_Error; 3054 3055 elsif Present (Renamed_Object (P_Name)) then 3056 Error_Msg_N ("parent unit cannot be a renaming", Lib_Unit); 3057 raise Unrecoverable_Error; 3058 3059 -- Verify that a child of an instance is itself an instance, or 3060 -- the renaming of one. Given that an instance that is a unit is 3061 -- replaced with a package declaration, check against the original 3062 -- node. 3063 3064 elsif Nkind (Original_Node (P)) = N_Package_Instantiation 3065 and then Nkind (Lib_Unit) 3066 not in N_Renaming_Declaration 3067 and then Nkind (Original_Node (Lib_Unit)) 3068 not in N_Generic_Instantiation 3069 then 3070 Error_Msg_N 3071 ("child of an instance must be an instance or renaming", Lib_Unit); 3072 end if; 3073 3074 -- This is the recursive call that ensures all parents are loaded 3075 3076 if Is_Child_Spec (P) then 3077 Install_Parents (P, 3078 Is_Private or else Private_Present (Parent (Lib_Unit))); 3079 end if; 3080 3081 -- Now we can install the context for this parent 3082 3083 Install_Context_Clauses (Parent_Spec (Lib_Unit)); 3084 Install_Siblings (P_Name, Parent (Lib_Unit)); 3085 3086 -- The child unit is in the declarative region of the parent. The 3087 -- parent must therefore appear in the scope stack and be visible, 3088 -- as when compiling the corresponding body. If the child unit is 3089 -- private or it is a package body, private declarations must be 3090 -- accessible as well. Use declarations in the parent must also 3091 -- be installed. Finally, other child units of the same parent that 3092 -- are in the context are immediately visible. 3093 3094 -- Find entity for compilation unit, and set its private descendant 3095 -- status as needed. 3096 3097 E_Name := Defining_Entity (Lib_Unit); 3098 3099 Set_Is_Child_Unit (E_Name); 3100 3101 Set_Is_Private_Descendant (E_Name, 3102 Is_Private_Descendant (P_Name) 3103 or else Private_Present (Parent (Lib_Unit))); 3104 3105 P_Spec := Specification (Unit_Declaration_Node (P_Name)); 3106 New_Scope (P_Name); 3107 3108 -- Save current visibility of unit 3109 3110 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility := 3111 Is_Immediately_Visible (P_Name); 3112 Set_Is_Immediately_Visible (P_Name); 3113 Install_Visible_Declarations (P_Name); 3114 Set_Use (Visible_Declarations (P_Spec)); 3115 3116 -- If the parent is a generic unit, its formal part may contain 3117 -- formal packages and use clauses for them. 3118 3119 if Ekind (P_Name) = E_Generic_Package then 3120 Set_Use (Generic_Formal_Declarations (Parent (P_Spec))); 3121 end if; 3122 3123 if Is_Private 3124 or else Private_Present (Parent (Lib_Unit)) 3125 then 3126 Install_Private_Declarations (P_Name); 3127 Set_Use (Private_Declarations (P_Spec)); 3128 end if; 3129 end Install_Parents; 3130 3131 ---------------------- 3132 -- Install_Siblings -- 3133 ---------------------- 3134 3135 procedure Install_Siblings (U_Name : Entity_Id; N : Node_Id) is 3136 Item : Node_Id; 3137 Id : Entity_Id; 3138 Prev : Entity_Id; 3139 3140 function Is_Ancestor (E : Entity_Id) return Boolean; 3141 -- Determine whether the scope of a child unit is an ancestor of 3142 -- the current unit. 3143 -- Shouldn't this be somewhere more general ??? 3144 3145 ----------------- 3146 -- Is_Ancestor -- 3147 ----------------- 3148 3149 function Is_Ancestor (E : Entity_Id) return Boolean is 3150 Par : Entity_Id; 3151 3152 begin 3153 Par := U_Name; 3154 3155 while Present (Par) 3156 and then Par /= Standard_Standard 3157 loop 3158 3159 if Par = E then 3160 return True; 3161 end if; 3162 3163 Par := Scope (Par); 3164 end loop; 3165 3166 return False; 3167 end Is_Ancestor; 3168 3169 -- Start of processing for Install_Siblings 3170 3171 begin 3172 -- Iterate over explicit with clauses, and check whether the 3173 -- scope of each entity is an ancestor of the current unit. 3174 3175 Item := First (Context_Items (N)); 3176 3177 while Present (Item) loop 3178 3179 if Nkind (Item) = N_With_Clause 3180 and then not Implicit_With (Item) 3181 and then not Limited_Present (Item) 3182 then 3183 Id := Entity (Name (Item)); 3184 3185 if Is_Child_Unit (Id) 3186 and then Is_Ancestor (Scope (Id)) 3187 then 3188 Set_Is_Immediately_Visible (Id); 3189 Prev := Current_Entity (Id); 3190 3191 -- Check for the presence of another unit in the context, 3192 -- that may be inadvertently hidden by the child. 3193 3194 if Present (Prev) 3195 and then Is_Immediately_Visible (Prev) 3196 and then not Is_Child_Unit (Prev) 3197 then 3198 declare 3199 Clause : Node_Id; 3200 3201 begin 3202 Clause := First (Context_Items (N)); 3203 3204 while Present (Clause) loop 3205 if Nkind (Clause) = N_With_Clause 3206 and then Entity (Name (Clause)) = Prev 3207 then 3208 Error_Msg_NE 3209 ("child unit& hides compilation unit " & 3210 "with the same name?", 3211 Name (Item), Id); 3212 exit; 3213 end if; 3214 3215 Next (Clause); 3216 end loop; 3217 end; 3218 end if; 3219 3220 -- the With_Clause may be on a grand-child, which makes 3221 -- the child immediately visible. 3222 3223 elsif Is_Child_Unit (Scope (Id)) 3224 and then Is_Ancestor (Scope (Scope (Id))) 3225 then 3226 Set_Is_Immediately_Visible (Scope (Id)); 3227 end if; 3228 3229 end if; 3230 3231 Next (Item); 3232 end loop; 3233 end Install_Siblings; 3234 3235 ------------------------------- 3236 -- Install_Limited_With_Unit -- 3237 ------------------------------- 3238 3239 procedure Install_Limited_Withed_Unit (N : Node_Id) is 3240 Unum : constant Unit_Number_Type := 3241 Get_Source_Unit (Library_Unit (N)); 3242 P_Unit : constant Entity_Id := Unit (Library_Unit (N)); 3243 P : Entity_Id; 3244 Lim_Elmt : Elmt_Id; 3245 Lim_Typ : Entity_Id; 3246 Is_Child_Package : Boolean := False; 3247 3248 function In_Chain (E : Entity_Id) return Boolean; 3249 -- Check that the shadow entity is not already in the homonym 3250 -- chain, for example through a limited_with clause in a parent unit. 3251 3252 function In_Chain (E : Entity_Id) return Boolean is 3253 H : Entity_Id := Current_Entity (E); 3254 3255 begin 3256 while Present (H) loop 3257 if H = E then 3258 return True; 3259 else 3260 H := Homonym (H); 3261 end if; 3262 end loop; 3263 3264 return False; 3265 end In_Chain; 3266 3267 -- Start of processing for Install_Limited_Withed_Unit 3268 3269 begin 3270 -- In case of limited with_clause on subprograms, generics, instances, 3271 -- or generic renamings, the corresponding error was previously posted 3272 -- and we have nothing to do here. 3273 3274 case Nkind (P_Unit) is 3275 3276 when N_Package_Declaration => 3277 null; 3278 3279 when N_Subprogram_Declaration | 3280 N_Generic_Package_Declaration | 3281 N_Generic_Subprogram_Declaration | 3282 N_Package_Instantiation | 3283 N_Function_Instantiation | 3284 N_Procedure_Instantiation | 3285 N_Generic_Package_Renaming_Declaration | 3286 N_Generic_Procedure_Renaming_Declaration | 3287 N_Generic_Function_Renaming_Declaration => 3288 return; 3289 3290 when others => 3291 pragma Assert (False); 3292 null; 3293 end case; 3294 3295 P := Defining_Unit_Name (Specification (P_Unit)); 3296 3297 if Nkind (P) = N_Defining_Program_Unit_Name then 3298 3299 -- Retrieve entity of child package 3300 3301 Is_Child_Package := True; 3302 P := Defining_Identifier (P); 3303 end if; 3304 3305 -- A common usage of the limited-with is to have a limited-with 3306 -- in the package spec, and a normal with in its package body. 3307 -- For example: 3308 3309 -- limited with X; -- [1] 3310 -- package A is ... 3311 3312 -- with X; -- [2] 3313 -- package body A is ... 3314 3315 -- The compilation of A's body installs the entities of its 3316 -- withed packages (the context clauses found at [2]) and 3317 -- then the context clauses of its specification (found at [1]). 3318 3319 -- As a consequence, at point [1] the specification of X has been 3320 -- analyzed and it is immediately visible. According to the semantics 3321 -- of the limited-with context clauses we don't install the limited 3322 -- view because the full view of X supersedes its limited view. 3323 3324 if Analyzed (Cunit (Unum)) 3325 and then Is_Immediately_Visible (P) 3326 then 3327 return; 3328 end if; 3329 3330 if Debug_Flag_I then 3331 Write_Str ("install limited view of "); 3332 Write_Name (Chars (P)); 3333 Write_Eol; 3334 end if; 3335 3336 if not Analyzed (Cunit (Unum)) then 3337 Set_Ekind (P, E_Package); 3338 Set_Etype (P, Standard_Void_Type); 3339 Set_Scope (P, Standard_Standard); 3340 3341 -- Place entity on visibility structure 3342 3343 if Current_Entity (P) /= P then 3344 Set_Homonym (P, Current_Entity (P)); 3345 Set_Current_Entity (P); 3346 3347 if Debug_Flag_I then 3348 Write_Str (" (homonym) chain "); 3349 Write_Name (Chars (P)); 3350 Write_Eol; 3351 end if; 3352 3353 end if; 3354 3355 if Is_Child_Package then 3356 Set_Is_Child_Unit (P); 3357 Set_Is_Visible_Child_Unit (P); 3358 3359 declare 3360 Parent_Comp : Node_Id; 3361 Parent_Id : Entity_Id; 3362 3363 begin 3364 Parent_Comp := Parent_Spec (Unit (Cunit (Unum))); 3365 Parent_Id := Defining_Entity (Unit (Parent_Comp)); 3366 3367 Set_Scope (P, Parent_Id); 3368 end; 3369 end if; 3370 3371 else 3372 3373 -- If the unit appears in a previous regular with_clause, the 3374 -- regular entities must be unchained before the shadow ones 3375 -- are made accessible. 3376 3377 declare 3378 Ent : Entity_Id; 3379 begin 3380 Ent := First_Entity (P); 3381 3382 while Present (Ent) loop 3383 Unchain (Ent); 3384 Next_Entity (Ent); 3385 end loop; 3386 end; 3387 3388 end if; 3389 3390 -- The package must be visible while the with_type clause is active, 3391 -- because references to the type P.T must resolve in the usual way. 3392 3393 Set_Is_Immediately_Visible (P); 3394 3395 -- Install each incomplete view 3396 3397 Lim_Elmt := First_Elmt (Limited_Views (P)); 3398 3399 while Present (Lim_Elmt) loop 3400 Lim_Typ := Node (Lim_Elmt); 3401 3402 if not In_Chain (Lim_Typ) then 3403 Set_Homonym (Lim_Typ, Current_Entity (Lim_Typ)); 3404 Set_Current_Entity (Lim_Typ); 3405 3406 if Debug_Flag_I then 3407 Write_Str (" (homonym) chain "); 3408 Write_Name (Chars (Lim_Typ)); 3409 Write_Eol; 3410 end if; 3411 3412 end if; 3413 3414 Next_Elmt (Lim_Elmt); 3415 end loop; 3416 3417 -- The context clause has installed a limited-view, mark it 3418 -- accordingly, to uninstall it when the context is removed. 3419 3420 Set_Limited_View_Installed (N); 3421 Set_From_With_Type (P); 3422 end Install_Limited_Withed_Unit; 3423 3424 ------------------------- 3425 -- Install_Withed_Unit -- 3426 ------------------------- 3427 3428 procedure Install_Withed_Unit (With_Clause : Node_Id) is 3429 Uname : constant Entity_Id := Entity (Name (With_Clause)); 3430 P : constant Entity_Id := Scope (Uname); 3431 3432 begin 3433 3434 if Debug_Flag_I then 3435 Write_Str ("install withed unit "); 3436 Write_Name (Chars (Uname)); 3437 Write_Eol; 3438 end if; 3439 3440 -- We do not apply the restrictions to an internal unit unless 3441 -- we are compiling the internal unit as a main unit. This check 3442 -- is also skipped for dummy units (for missing packages). 3443 3444 if Sloc (Uname) /= No_Location 3445 and then (not Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit)) 3446 or else Current_Sem_Unit = Main_Unit) 3447 then 3448 Check_Restricted_Unit 3449 (Unit_Name (Get_Source_Unit (Uname)), With_Clause); 3450 end if; 3451 3452 if P /= Standard_Standard then 3453 3454 -- If the unit is not analyzed after analysis of the with clause, 3455 -- and it is an instantiation, then it awaits a body and is the main 3456 -- unit. Its appearance in the context of some other unit indicates 3457 -- a circular dependency (DEC suite perversity). 3458 3459 if not Analyzed (Uname) 3460 and then Nkind (Parent (Uname)) = N_Package_Instantiation 3461 then 3462 Error_Msg_N 3463 ("instantiation depends on itself", Name (With_Clause)); 3464 3465 elsif not Is_Visible_Child_Unit (Uname) then 3466 Set_Is_Visible_Child_Unit (Uname); 3467 3468 if Is_Generic_Instance (Uname) 3469 and then Ekind (Uname) in Subprogram_Kind 3470 then 3471 -- Set flag as well on the visible entity that denotes the 3472 -- instance, which renames the current one. 3473 3474 Set_Is_Visible_Child_Unit 3475 (Related_Instance 3476 (Defining_Entity (Unit (Library_Unit (With_Clause))))); 3477 null; 3478 end if; 3479 3480 -- The parent unit may have been installed already, and 3481 -- may have appeared in a use clause. 3482 3483 if In_Use (Scope (Uname)) then 3484 Set_Is_Potentially_Use_Visible (Uname); 3485 end if; 3486 3487 Set_Context_Installed (With_Clause); 3488 end if; 3489 3490 elsif not Is_Immediately_Visible (Uname) then 3491 Set_Is_Immediately_Visible (Uname); 3492 Set_Context_Installed (With_Clause); 3493 end if; 3494 3495 -- A with-clause overrides a with-type clause: there are no restric- 3496 -- tions on the use of package entities. 3497 3498 if Ekind (Uname) = E_Package then 3499 Set_From_With_Type (Uname, False); 3500 end if; 3501 end Install_Withed_Unit; 3502 3503 ------------------- 3504 -- Is_Child_Spec -- 3505 ------------------- 3506 3507 function Is_Child_Spec (Lib_Unit : Node_Id) return Boolean is 3508 K : constant Node_Kind := Nkind (Lib_Unit); 3509 3510 begin 3511 return (K in N_Generic_Declaration or else 3512 K in N_Generic_Instantiation or else 3513 K in N_Generic_Renaming_Declaration or else 3514 K = N_Package_Declaration or else 3515 K = N_Package_Renaming_Declaration or else 3516 K = N_Subprogram_Declaration or else 3517 K = N_Subprogram_Renaming_Declaration) 3518 and then Present (Parent_Spec (Lib_Unit)); 3519 end Is_Child_Spec; 3520 3521 ----------------------- 3522 -- Load_Needed_Body -- 3523 ----------------------- 3524 3525 -- N is a generic unit named in a with clause, or else it is 3526 -- a unit that contains a generic unit or an inlined function. 3527 -- In order to perform an instantiation, the body of the unit 3528 -- must be present. If the unit itself is generic, we assume 3529 -- that an instantiation follows, and load and analyze the body 3530 -- unconditionally. This forces analysis of the spec as well. 3531 3532 -- If the unit is not generic, but contains a generic unit, it 3533 -- is loaded on demand, at the point of instantiation (see ch12). 3534 3535 procedure Load_Needed_Body (N : Node_Id; OK : out Boolean) is 3536 Body_Name : Unit_Name_Type; 3537 Unum : Unit_Number_Type; 3538 3539 Save_Style_Check : constant Boolean := Opt.Style_Check; 3540 -- The loading and analysis is done with style checks off 3541 3542 begin 3543 if not GNAT_Mode then 3544 Style_Check := False; 3545 end if; 3546 3547 Body_Name := Get_Body_Name (Get_Unit_Name (Unit (N))); 3548 Unum := 3549 Load_Unit 3550 (Load_Name => Body_Name, 3551 Required => False, 3552 Subunit => False, 3553 Error_Node => N, 3554 Renamings => True); 3555 3556 if Unum = No_Unit then 3557 OK := False; 3558 3559 else 3560 Compiler_State := Analyzing; -- reset after load 3561 3562 if not Fatal_Error (Unum) or else Try_Semantics then 3563 if Debug_Flag_L then 3564 Write_Str ("*** Loaded generic body"); 3565 Write_Eol; 3566 end if; 3567 3568 Semantics (Cunit (Unum)); 3569 end if; 3570 3571 OK := True; 3572 end if; 3573 3574 Style_Check := Save_Style_Check; 3575 end Load_Needed_Body; 3576 3577 ------------------------- 3578 -- Build_Limited_Views -- 3579 ------------------------- 3580 3581 procedure Build_Limited_Views (N : Node_Id) is 3582 Unum : constant Unit_Number_Type := Get_Source_Unit (Library_Unit (N)); 3583 P : constant Entity_Id := Cunit_Entity (Unum); 3584 3585 Spec : Node_Id; -- To denote a package specification 3586 Lim_Typ : Entity_Id; -- To denote shadow entities. 3587 Comp_Typ : Entity_Id; -- To denote real entities. 3588 3589 procedure Decorate_Incomplete_Type 3590 (E : Entity_Id; 3591 Scop : Entity_Id); 3592 -- Add attributes of an incomplete type to a shadow entity. The same 3593 -- attributes are placed on the real entity, so that gigi receives 3594 -- a consistent view. 3595 3596 procedure Decorate_Package_Specification (P : Entity_Id); 3597 -- Add attributes of a package entity to the entity in a package 3598 -- declaration 3599 3600 procedure Decorate_Tagged_Type 3601 (Loc : Source_Ptr; 3602 T : Entity_Id; 3603 Scop : Entity_Id); 3604 -- Set basic attributes of tagged type T, including its class_wide type. 3605 -- The parameters Loc, Scope are used to decorate the class_wide type. 3606 3607 procedure Build_Chain (Spec : Node_Id; Scope : Entity_Id); 3608 -- Construct list of shadow entities and attach it to entity of 3609 -- package that is mentioned in a limited_with clause. 3610 3611 function New_Internal_Shadow_Entity 3612 (Kind : Entity_Kind; 3613 Sloc_Value : Source_Ptr; 3614 Id_Char : Character) return Entity_Id; 3615 -- This function is similar to New_Internal_Entity, except that the 3616 -- entity is not added to the scope's list of entities. 3617 3618 ------------------------------ 3619 -- Decorate_Incomplete_Type -- 3620 ------------------------------ 3621 3622 procedure Decorate_Incomplete_Type 3623 (E : Entity_Id; 3624 Scop : Entity_Id) 3625 is 3626 begin 3627 Set_Ekind (E, E_Incomplete_Type); 3628 Set_Scope (E, Scop); 3629 Set_Etype (E, E); 3630 Set_Is_First_Subtype (E, True); 3631 Set_Stored_Constraint (E, No_Elist); 3632 Set_Full_View (E, Empty); 3633 Init_Size_Align (E); 3634 end Decorate_Incomplete_Type; 3635 3636 -------------------------- 3637 -- Decorate_Tagged_Type -- 3638 -------------------------- 3639 3640 procedure Decorate_Tagged_Type 3641 (Loc : Source_Ptr; 3642 T : Entity_Id; 3643 Scop : Entity_Id) 3644 is 3645 CW : Entity_Id; 3646 3647 begin 3648 Decorate_Incomplete_Type (T, Scop); 3649 Set_Is_Tagged_Type (T); 3650 3651 -- Build corresponding class_wide type, if not previously done 3652 3653 if No (Class_Wide_Type (T)) then 3654 CW := Make_Defining_Identifier (Loc, New_Internal_Name ('S')); 3655 3656 Set_Ekind (CW, E_Class_Wide_Type); 3657 Set_Etype (CW, T); 3658 Set_Scope (CW, Scop); 3659 Set_Is_Tagged_Type (CW); 3660 Set_Is_First_Subtype (CW, True); 3661 Init_Size_Align (CW); 3662 Set_Has_Unknown_Discriminants (CW, True); 3663 Set_Class_Wide_Type (CW, CW); 3664 Set_Equivalent_Type (CW, Empty); 3665 Set_From_With_Type (CW, From_With_Type (T)); 3666 3667 Set_Class_Wide_Type (T, CW); 3668 end if; 3669 end Decorate_Tagged_Type; 3670 3671 ------------------------------------ 3672 -- Decorate_Package_Specification -- 3673 ------------------------------------ 3674 3675 procedure Decorate_Package_Specification (P : Entity_Id) is 3676 begin 3677 -- Place only the most basic attributes 3678 3679 Set_Ekind (P, E_Package); 3680 Set_Etype (P, Standard_Void_Type); 3681 end Decorate_Package_Specification; 3682 3683 ------------------------- 3684 -- New_Internal_Entity -- 3685 ------------------------- 3686 3687 function New_Internal_Shadow_Entity 3688 (Kind : Entity_Kind; 3689 Sloc_Value : Source_Ptr; 3690 Id_Char : Character) return Entity_Id 3691 is 3692 N : constant Entity_Id := 3693 Make_Defining_Identifier (Sloc_Value, 3694 Chars => New_Internal_Name (Id_Char)); 3695 3696 begin 3697 Set_Ekind (N, Kind); 3698 Set_Is_Internal (N, True); 3699 3700 if Kind in Type_Kind then 3701 Init_Size_Align (N); 3702 end if; 3703 3704 return N; 3705 end New_Internal_Shadow_Entity; 3706 3707 ----------------- 3708 -- Build_Chain -- 3709 ----------------- 3710 3711 -- Could use more comments below ??? 3712 3713 procedure Build_Chain (Spec : Node_Id; Scope : Entity_Id) is 3714 Analyzed_Unit : constant Boolean := Analyzed (Cunit (Unum)); 3715 Is_Tagged : Boolean; 3716 Decl : Node_Id; 3717 3718 begin 3719 Decl := First (Visible_Declarations (Spec)); 3720 3721 while Present (Decl) loop 3722 if Nkind (Decl) = N_Full_Type_Declaration then 3723 Is_Tagged := 3724 Nkind (Type_Definition (Decl)) = N_Record_Definition 3725 and then Tagged_Present (Type_Definition (Decl)); 3726 3727 Comp_Typ := Defining_Identifier (Decl); 3728 3729 if not Analyzed_Unit then 3730 if Is_Tagged then 3731 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope); 3732 else 3733 Decorate_Incomplete_Type (Comp_Typ, Scope); 3734 end if; 3735 end if; 3736 3737 -- Create shadow entity for type 3738 3739 Lim_Typ := New_Internal_Shadow_Entity 3740 (Kind => Ekind (Comp_Typ), 3741 Sloc_Value => Sloc (Comp_Typ), 3742 Id_Char => 'Z'); 3743 3744 Set_Chars (Lim_Typ, Chars (Comp_Typ)); 3745 Set_Parent (Lim_Typ, Parent (Comp_Typ)); 3746 Set_From_With_Type (Lim_Typ); 3747 3748 if Is_Tagged then 3749 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope); 3750 else 3751 Decorate_Incomplete_Type (Lim_Typ, Scope); 3752 end if; 3753 3754 Set_Non_Limited_View (Lim_Typ, Comp_Typ); 3755 Append_Elmt (Lim_Typ, To => Limited_Views (P)); 3756 3757 elsif Nkind (Decl) = N_Private_Type_Declaration 3758 and then Tagged_Present (Decl) 3759 then 3760 Comp_Typ := Defining_Identifier (Decl); 3761 3762 if not Analyzed_Unit then 3763 Decorate_Tagged_Type (Sloc (Decl), Comp_Typ, Scope); 3764 end if; 3765 3766 Lim_Typ := New_Internal_Shadow_Entity 3767 (Kind => Ekind (Comp_Typ), 3768 Sloc_Value => Sloc (Comp_Typ), 3769 Id_Char => 'Z'); 3770 3771 Set_Chars (Lim_Typ, Chars (Comp_Typ)); 3772 Set_Parent (Lim_Typ, Parent (Comp_Typ)); 3773 Set_From_With_Type (Lim_Typ); 3774 3775 Decorate_Tagged_Type (Sloc (Decl), Lim_Typ, Scope); 3776 3777 Set_Non_Limited_View (Lim_Typ, Comp_Typ); 3778 Append_Elmt (Lim_Typ, To => Limited_Views (P)); 3779 3780 elsif Nkind (Decl) = N_Package_Declaration then 3781 3782 -- Local package 3783 3784 declare 3785 Spec : constant Node_Id := Specification (Decl); 3786 3787 begin 3788 Comp_Typ := Defining_Unit_Name (Spec); 3789 3790 if not Analyzed (Cunit (Unum)) then 3791 Decorate_Package_Specification (Comp_Typ); 3792 Set_Scope (Comp_Typ, Scope); 3793 end if; 3794 3795 Lim_Typ := New_Internal_Shadow_Entity 3796 (Kind => Ekind (Comp_Typ), 3797 Sloc_Value => Sloc (Comp_Typ), 3798 Id_Char => 'Z'); 3799 3800 Decorate_Package_Specification (Lim_Typ); 3801 Set_Scope (Lim_Typ, Scope); 3802 3803 Set_Chars (Lim_Typ, Chars (Comp_Typ)); 3804 Set_Parent (Lim_Typ, Parent (Comp_Typ)); 3805 Set_From_With_Type (Lim_Typ); 3806 3807 -- Note: The non_limited_view attribute is not used 3808 -- for local packages. 3809 3810 Append_Elmt (Lim_Typ, To => Limited_Views (P)); 3811 3812 Build_Chain (Spec, Scope => Lim_Typ); 3813 end; 3814 end if; 3815 3816 Next (Decl); 3817 end loop; 3818 end Build_Chain; 3819 3820 -- Start of processing for Build_Limited_Views 3821 3822 begin 3823 pragma Assert (Limited_Present (N)); 3824 3825 -- A library_item mentioned in a limited_with_clause shall be 3826 -- a package_declaration, not a subprogram_declaration, 3827 -- generic_declaration, generic_instantiation, or 3828 -- package_renaming_declaration 3829 3830 case Nkind (Unit (Library_Unit (N))) is 3831 3832 when N_Package_Declaration => 3833 null; 3834 3835 when N_Subprogram_Declaration => 3836 Error_Msg_N ("subprograms not allowed in " 3837 & "limited with_clauses", N); 3838 return; 3839 3840 when N_Generic_Package_Declaration | 3841 N_Generic_Subprogram_Declaration => 3842 Error_Msg_N ("generics not allowed in " 3843 & "limited with_clauses", N); 3844 return; 3845 3846 when N_Package_Instantiation | 3847 N_Function_Instantiation | 3848 N_Procedure_Instantiation => 3849 Error_Msg_N ("generic instantiations not allowed in " 3850 & "limited with_clauses", N); 3851 return; 3852 3853 when N_Generic_Package_Renaming_Declaration | 3854 N_Generic_Procedure_Renaming_Declaration | 3855 N_Generic_Function_Renaming_Declaration => 3856 Error_Msg_N ("generic renamings not allowed in " 3857 & "limited with_clauses", N); 3858 return; 3859 3860 when others => 3861 pragma Assert (False); 3862 null; 3863 end case; 3864 3865 -- Check if the chain is already built 3866 3867 Spec := Specification (Unit (Library_Unit (N))); 3868 3869 if Limited_View_Installed (Spec) then 3870 return; 3871 end if; 3872 3873 Set_Ekind (P, E_Package); 3874 Set_Limited_Views (P, New_Elmt_List); 3875 -- Set_Entity (Name (N), P); 3876 3877 -- Create the auxiliary chain 3878 3879 Build_Chain (Spec, Scope => P); 3880 Set_Limited_View_Installed (Spec); 3881 end Build_Limited_Views; 3882 3883 ------------------------------- 3884 -- Check_Body_Needed_For_SAL -- 3885 ------------------------------- 3886 3887 procedure Check_Body_Needed_For_SAL (Unit_Name : Entity_Id) is 3888 3889 function Entity_Needs_Body (E : Entity_Id) return Boolean; 3890 -- Determine whether use of entity E might require the presence 3891 -- of its body. For a package this requires a recursive traversal 3892 -- of all nested declarations. 3893 3894 --------------------------- 3895 -- Entity_Needed_For_SAL -- 3896 --------------------------- 3897 3898 function Entity_Needs_Body (E : Entity_Id) return Boolean is 3899 Ent : Entity_Id; 3900 3901 begin 3902 if Is_Subprogram (E) 3903 and then Has_Pragma_Inline (E) 3904 then 3905 return True; 3906 3907 elsif Ekind (E) = E_Generic_Function 3908 or else Ekind (E) = E_Generic_Procedure 3909 then 3910 return True; 3911 3912 elsif Ekind (E) = E_Generic_Package 3913 and then 3914 Nkind (Unit_Declaration_Node (E)) = N_Generic_Package_Declaration 3915 and then Present (Corresponding_Body (Unit_Declaration_Node (E))) 3916 then 3917 return True; 3918 3919 elsif Ekind (E) = E_Package 3920 and then 3921 Nkind (Unit_Declaration_Node (E)) = N_Package_Declaration 3922 and then Present (Corresponding_Body (Unit_Declaration_Node (E))) 3923 then 3924 Ent := First_Entity (E); 3925 3926 while Present (Ent) loop 3927 if Entity_Needs_Body (Ent) then 3928 return True; 3929 end if; 3930 3931 Next_Entity (Ent); 3932 end loop; 3933 3934 return False; 3935 3936 else 3937 return False; 3938 end if; 3939 end Entity_Needs_Body; 3940 3941 -- Start of processing for Check_Body_Needed_For_SAL 3942 3943 begin 3944 if Ekind (Unit_Name) = E_Generic_Package 3945 and then 3946 Nkind (Unit_Declaration_Node (Unit_Name)) = 3947 N_Generic_Package_Declaration 3948 and then 3949 Present (Corresponding_Body (Unit_Declaration_Node (Unit_Name))) 3950 then 3951 Set_Body_Needed_For_SAL (Unit_Name); 3952 3953 elsif Ekind (Unit_Name) = E_Generic_Procedure 3954 or else Ekind (Unit_Name) = E_Generic_Function 3955 then 3956 Set_Body_Needed_For_SAL (Unit_Name); 3957 3958 elsif Is_Subprogram (Unit_Name) 3959 and then Nkind (Unit_Declaration_Node (Unit_Name)) = 3960 N_Subprogram_Declaration 3961 and then Has_Pragma_Inline (Unit_Name) 3962 then 3963 Set_Body_Needed_For_SAL (Unit_Name); 3964 3965 elsif Ekind (Unit_Name) = E_Subprogram_Body then 3966 Check_Body_Needed_For_SAL 3967 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name))); 3968 3969 elsif Ekind (Unit_Name) = E_Package 3970 and then Entity_Needs_Body (Unit_Name) 3971 then 3972 Set_Body_Needed_For_SAL (Unit_Name); 3973 3974 elsif Ekind (Unit_Name) = E_Package_Body 3975 and then Nkind (Unit_Declaration_Node (Unit_Name)) = N_Package_Body 3976 then 3977 Check_Body_Needed_For_SAL 3978 (Corresponding_Spec (Unit_Declaration_Node (Unit_Name))); 3979 end if; 3980 end Check_Body_Needed_For_SAL; 3981 3982 -------------------- 3983 -- Remove_Context -- 3984 -------------------- 3985 3986 procedure Remove_Context (N : Node_Id) is 3987 Lib_Unit : constant Node_Id := Unit (N); 3988 3989 begin 3990 -- If this is a child unit, first remove the parent units. 3991 3992 if Is_Child_Spec (Lib_Unit) then 3993 Remove_Parents (Lib_Unit); 3994 end if; 3995 3996 Remove_Context_Clauses (N); 3997 end Remove_Context; 3998 3999 ---------------------------- 4000 -- Remove_Context_Clauses -- 4001 ---------------------------- 4002 4003 procedure Remove_Context_Clauses (N : Node_Id) is 4004 Item : Node_Id; 4005 Unit_Name : Entity_Id; 4006 4007 begin 4008 -- Ada0Y (AI-50217): We remove the context clauses in two phases: 4009 -- limited-views first and regular-views later (to maintain the 4010 -- stack model). 4011 4012 -- First Phase: Remove limited_with context clauses 4013 4014 Item := First (Context_Items (N)); 4015 while Present (Item) loop 4016 4017 -- We are interested only in with clauses which got installed 4018 -- on entry. 4019 4020 if Nkind (Item) = N_With_Clause 4021 and then Limited_Present (Item) 4022 and then Limited_View_Installed (Item) 4023 then 4024 Remove_Limited_With_Clause (Item); 4025 4026 end if; 4027 4028 Next (Item); 4029 end loop; 4030 4031 -- Second Phase: Loop through context items and undo regular 4032 -- with_clauses and use_clauses. 4033 4034 Item := First (Context_Items (N)); 4035 while Present (Item) loop 4036 4037 -- We are interested only in with clauses which got installed 4038 -- on entry, as indicated by their Context_Installed flag set 4039 4040 if Nkind (Item) = N_With_Clause 4041 and then Limited_Present (Item) 4042 and then Limited_View_Installed (Item) 4043 then 4044 null; 4045 4046 elsif Nkind (Item) = N_With_Clause 4047 and then Context_Installed (Item) 4048 then 4049 -- Remove items from one with'ed unit 4050 4051 Unit_Name := Entity (Name (Item)); 4052 Remove_Unit_From_Visibility (Unit_Name); 4053 Set_Context_Installed (Item, False); 4054 4055 elsif Nkind (Item) = N_Use_Package_Clause then 4056 End_Use_Package (Item); 4057 4058 elsif Nkind (Item) = N_Use_Type_Clause then 4059 End_Use_Type (Item); 4060 4061 elsif Nkind (Item) = N_With_Type_Clause then 4062 Remove_With_Type_Clause (Name (Item)); 4063 end if; 4064 4065 Next (Item); 4066 end loop; 4067 end Remove_Context_Clauses; 4068 4069 -------------------------------- 4070 -- Remove_Limited_With_Clause -- 4071 -------------------------------- 4072 4073 procedure Remove_Limited_With_Clause (N : Node_Id) is 4074 P_Unit : constant Entity_Id := Unit (Library_Unit (N)); 4075 P : Entity_Id := Defining_Unit_Name (Specification (P_Unit)); 4076 Lim_Elmt : Elmt_Id; 4077 Lim_Typ : Entity_Id; 4078 4079 begin 4080 if Nkind (P) = N_Defining_Program_Unit_Name then 4081 4082 -- Retrieve entity of Child package 4083 4084 P := Defining_Identifier (P); 4085 end if; 4086 4087 if Debug_Flag_I then 4088 Write_Str ("remove limited view of "); 4089 Write_Name (Chars (P)); 4090 Write_Str (" from visibility"); 4091 Write_Eol; 4092 end if; 4093 4094 -- Remove all shadow entities from visibility 4095 4096 Lim_Elmt := First_Elmt (Limited_Views (P)); 4097 4098 while Present (Lim_Elmt) loop 4099 Lim_Typ := Node (Lim_Elmt); 4100 4101 Unchain (Lim_Typ); 4102 Next_Elmt (Lim_Elmt); 4103 end loop; 4104 4105 -- Indicate that the limited view of the package is not installed 4106 4107 Set_From_With_Type (P, False); 4108 Set_Limited_View_Installed (N, False); 4109 4110 -- If the exporting package has previously been analyzed, it 4111 -- has appeared in the closure already and should be left alone. 4112 -- Otherwise, remove package itself from visibility. 4113 4114 if not Analyzed (P_Unit) then 4115 Unchain (P); 4116 Set_First_Entity (P, Empty); 4117 Set_Last_Entity (P, Empty); 4118 Set_Ekind (P, E_Void); 4119 Set_Scope (P, Empty); 4120 Set_Is_Immediately_Visible (P, False); 4121 4122 else 4123 4124 -- Reinstall visible entities (entities removed from visibility in 4125 -- Install_Limited_Withed to install the shadow entities). 4126 4127 declare 4128 Ent : Entity_Id; 4129 4130 begin 4131 Ent := First_Entity (P); 4132 while Present (Ent) and then Ent /= First_Private_Entity (P) loop 4133 4134 -- Shadow entities have not been added to the list of 4135 -- entities associated to the package spec. Therefore we 4136 -- just have to re-chain all its visible entities. 4137 4138 if not Is_Class_Wide_Type (Ent) then 4139 4140 Set_Homonym (Ent, Current_Entity (Ent)); 4141 Set_Current_Entity (Ent); 4142 4143 if Debug_Flag_I then 4144 Write_Str (" (homonym) chain "); 4145 Write_Name (Chars (Ent)); 4146 Write_Eol; 4147 end if; 4148 4149 end if; 4150 4151 Next_Entity (Ent); 4152 end loop; 4153 end; 4154 end if; 4155 end Remove_Limited_With_Clause; 4156 4157 -------------------- 4158 -- Remove_Parents -- 4159 -------------------- 4160 4161 procedure Remove_Parents (Lib_Unit : Node_Id) is 4162 P : Node_Id; 4163 P_Name : Entity_Id; 4164 E : Entity_Id; 4165 Vis : constant Boolean := 4166 Scope_Stack.Table (Scope_Stack.Last).Previous_Visibility; 4167 4168 begin 4169 if Is_Child_Spec (Lib_Unit) then 4170 P := Unit (Parent_Spec (Lib_Unit)); 4171 P_Name := Get_Parent_Entity (P); 4172 4173 Remove_Context_Clauses (Parent_Spec (Lib_Unit)); 4174 End_Package_Scope (P_Name); 4175 Set_Is_Immediately_Visible (P_Name, Vis); 4176 4177 -- Remove from visibility the siblings as well, which are directly 4178 -- visible while the parent is in scope. 4179 4180 E := First_Entity (P_Name); 4181 4182 while Present (E) loop 4183 4184 if Is_Child_Unit (E) then 4185 Set_Is_Immediately_Visible (E, False); 4186 end if; 4187 4188 Next_Entity (E); 4189 end loop; 4190 4191 Set_In_Package_Body (P_Name, False); 4192 4193 -- This is the recursive call to remove the context of any 4194 -- higher level parent. This recursion ensures that all parents 4195 -- are removed in the reverse order of their installation. 4196 4197 Remove_Parents (P); 4198 end if; 4199 end Remove_Parents; 4200 4201 ----------------------------- 4202 -- Remove_With_Type_Clause -- 4203 ----------------------------- 4204 4205 procedure Remove_With_Type_Clause (Name : Node_Id) is 4206 Typ : Entity_Id; 4207 P : Entity_Id; 4208 4209 procedure Unchain (E : Entity_Id); 4210 -- Remove entity from visibility list. 4211 4212 procedure Unchain (E : Entity_Id) is 4213 Prev : Entity_Id; 4214 4215 begin 4216 Prev := Current_Entity (E); 4217 4218 -- Package entity may appear is several with_type_clauses, and 4219 -- may have been removed already. 4220 4221 if No (Prev) then 4222 return; 4223 4224 elsif Prev = E then 4225 Set_Name_Entity_Id (Chars (E), Homonym (E)); 4226 4227 else 4228 while Present (Prev) 4229 and then Homonym (Prev) /= E 4230 loop 4231 Prev := Homonym (Prev); 4232 end loop; 4233 4234 if Present (Prev) then 4235 Set_Homonym (Prev, Homonym (E)); 4236 end if; 4237 end if; 4238 end Unchain; 4239 4240 -- Start of Remove_With_Type_Clause 4241 4242 begin 4243 if Nkind (Name) = N_Selected_Component then 4244 Typ := Entity (Selector_Name (Name)); 4245 4246 if No (Typ) then -- error in declaration. 4247 return; 4248 end if; 4249 else 4250 return; 4251 end if; 4252 4253 P := Scope (Typ); 4254 4255 -- If the exporting package has been analyzed, it has appeared in the 4256 -- context already and should be left alone. Otherwise, remove from 4257 -- visibility. 4258 4259 if not Analyzed (Unit_Declaration_Node (P)) then 4260 Unchain (P); 4261 Unchain (Typ); 4262 Set_Is_Frozen (Typ, False); 4263 end if; 4264 4265 if Ekind (Typ) = E_Record_Type then 4266 Set_From_With_Type (Class_Wide_Type (Typ), False); 4267 Set_From_With_Type (Typ, False); 4268 end if; 4269 4270 Set_From_With_Type (P, False); 4271 4272 -- If P is a child unit, remove parents as well. 4273 4274 P := Scope (P); 4275 4276 while Present (P) 4277 and then P /= Standard_Standard 4278 loop 4279 Set_From_With_Type (P, False); 4280 4281 if not Analyzed (Unit_Declaration_Node (P)) then 4282 Unchain (P); 4283 end if; 4284 4285 P := Scope (P); 4286 end loop; 4287 4288 -- The back-end needs to know that an access type is imported, so it 4289 -- does not need elaboration and can appear in a mutually recursive 4290 -- record definition, so the imported flag on an access type is 4291 -- preserved. 4292 4293 end Remove_With_Type_Clause; 4294 4295 --------------------------------- 4296 -- Remove_Unit_From_Visibility -- 4297 --------------------------------- 4298 4299 procedure Remove_Unit_From_Visibility (Unit_Name : Entity_Id) is 4300 P : constant Entity_Id := Scope (Unit_Name); 4301 4302 begin 4303 4304 if Debug_Flag_I then 4305 Write_Str ("remove unit "); 4306 Write_Name (Chars (Unit_Name)); 4307 Write_Str (" from visibility"); 4308 Write_Eol; 4309 end if; 4310 4311 if P /= Standard_Standard then 4312 Set_Is_Visible_Child_Unit (Unit_Name, False); 4313 end if; 4314 4315 Set_Is_Potentially_Use_Visible (Unit_Name, False); 4316 Set_Is_Immediately_Visible (Unit_Name, False); 4317 4318 end Remove_Unit_From_Visibility; 4319 4320 ------------- 4321 -- Unchain -- 4322 ------------- 4323 4324 procedure Unchain (E : Entity_Id) is 4325 Prev : Entity_Id; 4326 4327 begin 4328 Prev := Current_Entity (E); 4329 4330 if No (Prev) then 4331 return; 4332 4333 elsif Prev = E then 4334 Set_Name_Entity_Id (Chars (E), Homonym (E)); 4335 4336 else 4337 while Present (Prev) 4338 and then Homonym (Prev) /= E 4339 loop 4340 Prev := Homonym (Prev); 4341 end loop; 4342 4343 if Present (Prev) then 4344 Set_Homonym (Prev, Homonym (E)); 4345 end if; 4346 end if; 4347 4348 if Debug_Flag_I then 4349 Write_Str (" (homonym) unchain "); 4350 Write_Name (Chars (E)); 4351 Write_Eol; 4352 end if; 4353 4354 end Unchain; 4355end Sem_Ch10; 4356