1------------------------------------------------------------------------------ 2-- -- 3-- GNAT COMPILER COMPONENTS -- 4-- -- 5-- R T S F I N D -- 6-- -- 7-- B o d y -- 8-- -- 9-- Copyright (C) 1992-2015, Free Software Foundation, Inc. -- 10-- -- 11-- GNAT is free software; you can redistribute it and/or modify it under -- 12-- terms of the GNU General Public License as published by the Free Soft- -- 13-- ware Foundation; either version 3, or (at your option) any later ver- -- 14-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 15-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 16-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- 17-- for more details. You should have received a copy of the GNU General -- 18-- Public License distributed with GNAT; see file COPYING3. If not, go to -- 19-- http://www.gnu.org/licenses for a complete copy of the license. -- 20-- -- 21-- GNAT was originally developed by the GNAT team at New York University. -- 22-- Extensive contributions were provided by Ada Core Technologies Inc. -- 23-- -- 24------------------------------------------------------------------------------ 25 26with Atree; use Atree; 27with Casing; use Casing; 28with Csets; use Csets; 29with Debug; use Debug; 30with Einfo; use Einfo; 31with Elists; use Elists; 32with Errout; use Errout; 33with Exp_Dist; use Exp_Dist; 34with Fname; use Fname; 35with Fname.UF; use Fname.UF; 36with Lib; use Lib; 37with Lib.Load; use Lib.Load; 38with Namet; use Namet; 39with Nlists; use Nlists; 40with Nmake; use Nmake; 41with Output; use Output; 42with Opt; use Opt; 43with Restrict; use Restrict; 44with Sem; use Sem; 45with Sem_Aux; use Sem_Aux; 46with Sem_Ch7; use Sem_Ch7; 47with Sem_Dist; use Sem_Dist; 48with Sem_Util; use Sem_Util; 49with Sinfo; use Sinfo; 50with Stand; use Stand; 51with Snames; use Snames; 52with Tbuild; use Tbuild; 53with Uname; use Uname; 54 55package body Rtsfind is 56 57 RTE_Available_Call : Boolean := False; 58 -- Set True during call to RTE from RTE_Available (or from call to 59 -- RTE_Record_Component from RTE_Record_Component_Available). Tells 60 -- the called subprogram to set RTE_Is_Available to False rather than 61 -- generating an error message. 62 63 RTE_Is_Available : Boolean; 64 -- Set True by RTE_Available on entry. When RTE_Available_Call is set 65 -- True, set False if RTE would otherwise generate an error message. 66 67 ---------------- 68 -- Unit table -- 69 ---------------- 70 71 -- The unit table has one entry for each unit included in the definition 72 -- of the type RTU_Id in the spec. The table entries are initialized in 73 -- Initialize to set the Entity field to Empty, indicating that the 74 -- corresponding unit has not yet been loaded. The fields are set when 75 -- a unit is loaded to contain the defining entity for the unit, the 76 -- unit name, and the unit number. 77 78 -- Note that a unit can be loaded either by a call to find an entity 79 -- within the unit (e.g. RTE), or by an explicit with of the unit. In 80 -- the latter case it is critical to make a call to Set_RTU_Loaded to 81 -- ensure that the entry in this table reflects the load. 82 83 -- A unit retrieved through rtsfind may end up in the context of several 84 -- other units, in addition to the main unit. These additional with_clauses 85 -- are needed to generate a proper traversal order for CodePeer. To 86 -- minimize somewhat the redundancy created by numerous calls to rtsfind 87 -- from different units, we keep track of the list of implicit with_clauses 88 -- already created for the current loaded unit. 89 90 type RT_Unit_Table_Record is record 91 Entity : Entity_Id; 92 Uname : Unit_Name_Type; 93 First_Implicit_With : Node_Id; 94 Unum : Unit_Number_Type; 95 end record; 96 97 RT_Unit_Table : array (RTU_Id) of RT_Unit_Table_Record; 98 99 -------------------------- 100 -- Runtime Entity Table -- 101 -------------------------- 102 103 -- There is one entry in the runtime entity table for each entity that is 104 -- included in the definition of the RE_Id type in the spec. The entries 105 -- are set by Initialize_Rtsfind to contain Empty, indicating that the 106 -- entity has not yet been located. Once the entity is located for the 107 -- first time, its ID is stored in this array, so that subsequent calls 108 -- for the same entity can be satisfied immediately. 109 110 -- NOTE: In order to avoid conflicts between record components and subprgs 111 -- that have the same name (i.e. subprogram External_Tag and 112 -- component External_Tag of package Ada.Tags) this table is not used 113 -- with Record_Components. 114 115 RE_Table : array (RE_Id) of Entity_Id; 116 117 -------------------------------- 118 -- Generation of with_clauses -- 119 -------------------------------- 120 121 -- When a unit is implicitly loaded as a result of a call to RTE, it is 122 -- necessary to create one or two implicit with_clauses. We add such 123 -- with_clauses to the extended main unit if needed, and also to whatever 124 -- unit needs them, which is not necessarily the main unit. The former 125 -- ensures that the object is correctly loaded by the binder. The latter 126 -- is necessary for CodePeer. 127 128 -- The field First_Implicit_With in the unit table record are used to 129 -- avoid creating duplicate with_clauses. 130 131 ---------------------------------------------- 132 -- Table of Predefined RE_Id Error Messages -- 133 ---------------------------------------------- 134 135 -- If an attempt is made to load an entity, given an RE_Id value, and the 136 -- entity is not available in the current configuration, an error message 137 -- is given (see Entity_Not_Defined below). The general form of such an 138 -- error message is for example: 139 140 -- entity "System.Pack_43.Bits_43" not defined 141 142 -- The following table defines a set of RE_Id image values for which this 143 -- error message is specialized and replaced by specific text indicating 144 -- the exact message to be output. For example, in the case above, for the 145 -- RE_Id value RE_Bits_43, we do indeed specialize the message, and the 146 -- above generic message is replaced by: 147 148 -- packed component size of 43 is not supported 149 150 type CString_Ptr is access constant String; 151 152 type PRE_Id_Entry is record 153 Str : CString_Ptr; 154 -- Pointer to string with the RE_Id image. The sequence ?? may appear 155 -- in which case it will match any characters in the RE_Id image value. 156 -- This is used to avoid the need for dozens of entries for RE_Bits_??. 157 158 Msg : CString_Ptr; 159 -- Pointer to string with the corresponding error text. The sequence 160 -- ?? may appear, in which case, it is replaced by the corresponding 161 -- sequence ?? in the Str value (if the first ? is zero, then it is 162 -- omitted from the message). 163 end record; 164 165 Str1 : aliased constant String := "RE_BITS_??"; 166 Str2 : aliased constant String := "RE_GET_??"; 167 Str3 : aliased constant String := "RE_SET_??"; 168 Str4 : aliased constant String := "RE_CALL_SIMPLE"; 169 170 MsgPack : aliased constant String := 171 "packed component size of ?? is not supported"; 172 MsgRV : aliased constant String := 173 "task rendezvous is not supported"; 174 175 PRE_Id_Table : constant array (Natural range <>) of PRE_Id_Entry := 176 (1 => (Str1'Access, MsgPack'Access), 177 2 => (Str2'Access, MsgPack'Access), 178 3 => (Str3'Access, MsgPack'Access), 179 4 => (Str4'Access, MsgRV'Access)); 180 -- We will add entries to this table as we find cases where it is a good 181 -- idea to do so. By no means all the RE_Id values need entries, because 182 -- the expander often gives clear messages before it makes the Rtsfind 183 -- call expecting to find the entity. 184 185 ----------------------- 186 -- Local Subprograms -- 187 ----------------------- 188 189 function Check_CRT (E : RE_Id; Eid : Entity_Id) return Entity_Id; 190 -- Check entity Eid to ensure that configurable run-time restrictions are 191 -- met. May generate an error message (if RTE_Available_Call is false) and 192 -- raise RE_Not_Available if entity E does not exist (e.g. Eid is Empty). 193 -- Also check that entity is not overloaded. 194 195 procedure Entity_Not_Defined (Id : RE_Id); 196 -- Outputs error messages for an entity that is not defined in the run-time 197 -- library (the form of the error message is tailored for no run time or 198 -- configurable run time mode as required). See also table of pre-defined 199 -- messages for entities above (RE_Id_Messages). 200 201 function Get_Unit_Name (U_Id : RTU_Id) return Unit_Name_Type; 202 -- Retrieves the Unit Name given a unit id represented by its enumeration 203 -- value in RTU_Id. 204 205 procedure Load_Fail (S : String; U_Id : RTU_Id; Id : RE_Id); 206 pragma No_Return (Load_Fail); 207 -- Internal procedure called if we can't successfully locate or process a 208 -- run-time unit. The parameters give information about the error message 209 -- to be given. S is a reason for failing to compile the file and U_Id is 210 -- the unit id. RE_Id is the RE_Id originally passed to RTE. The message in 211 -- S is one of the following: 212 -- 213 -- "not found" 214 -- "had parser errors" 215 -- "had semantic errors" 216 -- 217 -- The "not found" case is treated specially in that it is considered 218 -- a normal situation in configurable run-time mode, and generates 219 -- a warning, but is otherwise ignored. 220 221 procedure Load_RTU 222 (U_Id : RTU_Id; 223 Id : RE_Id := RE_Null; 224 Use_Setting : Boolean := False); 225 -- Load the unit whose Id is given if not already loaded. The unit is 226 -- loaded and analyzed, and the entry in RT_Unit_Table is updated to 227 -- reflect the load. Use_Setting is used to indicate the initial setting 228 -- for the Is_Potentially_Use_Visible flag of the entity for the loaded 229 -- unit (if it is indeed loaded). A value of False means nothing special 230 -- need be done. A value of True indicates that this flag must be set to 231 -- True. It is needed only in the Check_Text_IO_Special_Unit procedure, 232 -- which may materialize an entity of Text_IO (or [Wide_]Wide_Text_IO) that 233 -- was previously unknown. Id is the RE_Id value of the entity which was 234 -- originally requested. Id is used only for error message detail, and if 235 -- it is RE_Null, then the attempt to output the entity name is ignored. 236 237 function Make_Unit_Name 238 (U : RT_Unit_Table_Record; 239 N : Node_Id) return Node_Id; 240 -- If the unit is a child unit, build fully qualified name for use in 241 -- With_Clause. 242 243 procedure Maybe_Add_With (U : in out RT_Unit_Table_Record); 244 -- If necessary, add an implicit with_clause from the current unit to the 245 -- one represented by U. 246 247 procedure Output_Entity_Name (Id : RE_Id; Msg : String); 248 -- Output continuation error message giving qualified name of entity 249 -- corresponding to Id, appending the string given by Msg. 250 251 function RE_Chars (E : RE_Id) return Name_Id; 252 -- Given a RE_Id value returns the Chars of the corresponding entity 253 254 procedure RTE_Error_Msg (Msg : String); 255 -- Generates a message by calling Error_Msg_N specifying Current_Error_Node 256 -- as the node location using the given Msg text. Special processing in the 257 -- case where RTE_Available_Call is set. In this case, no message is output 258 -- and instead RTE_Is_Available is set to False. Note that this can only be 259 -- used if you are sure that the message comes directly or indirectly from 260 -- a call to the RTE function. 261 262 --------------- 263 -- Check_CRT -- 264 --------------- 265 266 function Check_CRT (E : RE_Id; Eid : Entity_Id) return Entity_Id is 267 U_Id : constant RTU_Id := RE_Unit_Table (E); 268 269 begin 270 if No (Eid) then 271 if RTE_Available_Call then 272 RTE_Is_Available := False; 273 else 274 Entity_Not_Defined (E); 275 end if; 276 277 raise RE_Not_Available; 278 279 -- Entity is available 280 281 else 282 -- If in No_Run_Time mode and entity is neither in the current unit 283 -- nor in one of the specially permitted units, raise the exception. 284 285 if No_Run_Time_Mode 286 and then not OK_No_Run_Time_Unit (U_Id) 287 288 -- If the entity being referenced is defined in the current scope, 289 -- using it is always fine as such usage can never introduce any 290 -- dependency on an additional unit. The presence of this test 291 -- helps generating meaningful error messages for CRT violations. 292 293 and then Scope (Eid) /= Current_Scope 294 then 295 Entity_Not_Defined (E); 296 raise RE_Not_Available; 297 end if; 298 299 -- Check entity is not overloaded, checking for special exceptions 300 301 if Has_Homonym (Eid) 302 and then E /= RE_Save_Occurrence 303 then 304 Set_Standard_Error; 305 Write_Str ("Run-time configuration error ("); 306 Write_Str ("rtsfind entity """); 307 Get_Decoded_Name_String (Chars (Eid)); 308 Set_Casing (Mixed_Case); 309 Write_Str (Name_Buffer (1 .. Name_Len)); 310 Write_Str (""" is overloaded)"); 311 Write_Eol; 312 raise Unrecoverable_Error; 313 end if; 314 315 -- Otherwise entity is accessible 316 317 return Eid; 318 end if; 319 end Check_CRT; 320 321 -------------------------------- 322 -- Check_Text_IO_Special_Unit -- 323 -------------------------------- 324 325 procedure Check_Text_IO_Special_Unit (Nam : Node_Id) is 326 Chrs : Name_Id; 327 328 type Name_Map_Type is array (Text_IO_Package_Name) of RTU_Id; 329 330 Name_Map : constant Name_Map_Type := Name_Map_Type'( 331 Name_Decimal_IO => Ada_Text_IO_Decimal_IO, 332 Name_Enumeration_IO => Ada_Text_IO_Enumeration_IO, 333 Name_Fixed_IO => Ada_Text_IO_Fixed_IO, 334 Name_Float_IO => Ada_Text_IO_Float_IO, 335 Name_Integer_IO => Ada_Text_IO_Integer_IO, 336 Name_Modular_IO => Ada_Text_IO_Modular_IO); 337 338 Wide_Name_Map : constant Name_Map_Type := Name_Map_Type'( 339 Name_Decimal_IO => Ada_Wide_Text_IO_Decimal_IO, 340 Name_Enumeration_IO => Ada_Wide_Text_IO_Enumeration_IO, 341 Name_Fixed_IO => Ada_Wide_Text_IO_Fixed_IO, 342 Name_Float_IO => Ada_Wide_Text_IO_Float_IO, 343 Name_Integer_IO => Ada_Wide_Text_IO_Integer_IO, 344 Name_Modular_IO => Ada_Wide_Text_IO_Modular_IO); 345 346 Wide_Wide_Name_Map : constant Name_Map_Type := Name_Map_Type'( 347 Name_Decimal_IO => Ada_Wide_Wide_Text_IO_Decimal_IO, 348 Name_Enumeration_IO => Ada_Wide_Wide_Text_IO_Enumeration_IO, 349 Name_Fixed_IO => Ada_Wide_Wide_Text_IO_Fixed_IO, 350 Name_Float_IO => Ada_Wide_Wide_Text_IO_Float_IO, 351 Name_Integer_IO => Ada_Wide_Wide_Text_IO_Integer_IO, 352 Name_Modular_IO => Ada_Wide_Wide_Text_IO_Modular_IO); 353 354 To_Load : RTU_Id; 355 -- Unit to be loaded, from one of the above maps 356 357 begin 358 -- Nothing to do if name is not an identifier or a selected component 359 -- whose selector_name is an identifier. 360 361 if Nkind (Nam) = N_Identifier then 362 Chrs := Chars (Nam); 363 364 elsif Nkind (Nam) = N_Selected_Component 365 and then Nkind (Selector_Name (Nam)) = N_Identifier 366 then 367 Chrs := Chars (Selector_Name (Nam)); 368 369 else 370 return; 371 end if; 372 373 -- Nothing to do if name is not one of the Text_IO subpackages 374 -- Otherwise look through loaded units, and if we find Text_IO 375 -- or [Wide_]Wide_Text_IO already loaded, then load the proper child. 376 377 if Chrs in Text_IO_Package_Name then 378 for U in Main_Unit .. Last_Unit loop 379 Get_Name_String (Unit_File_Name (U)); 380 381 if Name_Len = 12 then 382 383 -- Here is where we do the loads if we find one of the units 384 -- Ada.Text_IO or Ada.[Wide_]Wide_Text_IO. An interesting 385 -- detail is that these units may already be used (i.e. their 386 -- In_Use flags may be set). Normally when the In_Use flag is 387 -- set, the Is_Potentially_Use_Visible flag of all entities in 388 -- the package is set, but the new entity we are mysteriously 389 -- adding was not there to have its flag set at the time. So 390 -- that's why we pass the extra parameter to RTU_Find, to make 391 -- sure the flag does get set now. Given that those generic 392 -- packages are in fact child units, we must indicate that 393 -- they are visible. 394 395 if Name_Buffer (1 .. 12) = "a-textio.ads" then 396 To_Load := Name_Map (Chrs); 397 398 elsif Name_Buffer (1 .. 12) = "a-witeio.ads" then 399 To_Load := Wide_Name_Map (Chrs); 400 401 elsif Name_Buffer (1 .. 12) = "a-ztexio.ads" then 402 To_Load := Wide_Wide_Name_Map (Chrs); 403 404 else 405 goto Continue; 406 end if; 407 408 Load_RTU (To_Load, Use_Setting => In_Use (Cunit_Entity (U))); 409 Set_Is_Visible_Lib_Unit (RT_Unit_Table (To_Load).Entity); 410 411 -- Prevent creation of an implicit 'with' from (for example) 412 -- Ada.Wide_Text_IO.Integer_IO to Ada.Text_IO.Integer_IO, 413 -- because these could create cycles. First check whether the 414 -- simple names match ("integer_io" = "integer_io"), and then 415 -- check whether the parent is indeed one of the 416 -- [[Wide_]Wide_]Text_IO packages. 417 418 if Chrs = Chars (Cunit_Entity (Current_Sem_Unit)) then 419 declare 420 Parent_Name : constant Unit_Name_Type := 421 Get_Parent_Spec_Name 422 (Unit_Name (Current_Sem_Unit)); 423 424 begin 425 if Parent_Name /= No_Unit_Name then 426 Get_Name_String (Parent_Name); 427 428 declare 429 P : String renames Name_Buffer (1 .. Name_Len); 430 begin 431 if P = "ada.text_io%s" or else 432 P = "ada.wide_text_io%s" or else 433 P = "ada.wide_wide_text_io%s" 434 then 435 goto Continue; 436 end if; 437 end; 438 end if; 439 end; 440 end if; 441 442 -- Add an implicit with clause from the current unit to the 443 -- [[Wide_]Wide_]Text_IO child (if necessary). 444 445 Maybe_Add_With (RT_Unit_Table (To_Load)); 446 end if; 447 448 <<Continue>> null; 449 end loop; 450 end if; 451 452 exception 453 -- Generate error message if run-time unit not available 454 455 when RE_Not_Available => 456 Error_Msg_N ("& not available", Nam); 457 end Check_Text_IO_Special_Unit; 458 459 ------------------------ 460 -- Entity_Not_Defined -- 461 ------------------------ 462 463 procedure Entity_Not_Defined (Id : RE_Id) is 464 begin 465 if No_Run_Time_Mode then 466 467 -- If the error occurs when compiling the body of a predefined 468 -- unit for inlining purposes, the body must be illegal in this 469 -- mode, and there is no point in continuing. 470 471 if Is_Predefined_File_Name 472 (Unit_File_Name (Get_Source_Unit (Sloc (Current_Error_Node)))) 473 then 474 Error_Msg_N 475 ("construct not allowed in no run time mode!", 476 Current_Error_Node); 477 raise Unrecoverable_Error; 478 479 else 480 RTE_Error_Msg ("|construct not allowed in no run time mode"); 481 end if; 482 483 elsif Configurable_Run_Time_Mode then 484 RTE_Error_Msg ("|construct not allowed in this configuration>"); 485 else 486 RTE_Error_Msg ("run-time configuration error"); 487 end if; 488 489 -- See if this entry is to be found in the PRE_Id table that provides 490 -- specialized messages for some RE_Id values. 491 492 for J in PRE_Id_Table'Range loop 493 declare 494 TStr : constant String := PRE_Id_Table (J).Str.all; 495 RStr : constant String := RE_Id'Image (Id); 496 TMsg : String := PRE_Id_Table (J).Msg.all; 497 LMsg : Natural := TMsg'Length; 498 499 begin 500 if TStr'Length = RStr'Length then 501 for J in TStr'Range loop 502 if TStr (J) /= RStr (J) and then TStr (J) /= '?' then 503 goto Continue; 504 end if; 505 end loop; 506 507 for J in TMsg'First .. TMsg'Last - 1 loop 508 if TMsg (J) = '?' then 509 for K in 1 .. TStr'Last loop 510 if TStr (K) = '?' then 511 if RStr (K) = '0' then 512 TMsg (J) := RStr (K + 1); 513 TMsg (J + 1 .. LMsg - 1) := TMsg (J + 2 .. LMsg); 514 LMsg := LMsg - 1; 515 else 516 TMsg (J .. J + 1) := RStr (K .. K + 1); 517 end if; 518 519 exit; 520 end if; 521 end loop; 522 end if; 523 end loop; 524 525 RTE_Error_Msg (TMsg (1 .. LMsg)); 526 return; 527 end if; 528 end; 529 530 <<Continue>> null; 531 end loop; 532 533 -- We did not find an entry in the table, so output the generic entity 534 -- not found message, where the name of the entity corresponds to the 535 -- given RE_Id value. 536 537 Output_Entity_Name (Id, "not defined"); 538 end Entity_Not_Defined; 539 540 ------------------- 541 -- Get_Unit_Name -- 542 ------------------- 543 544 function Get_Unit_Name (U_Id : RTU_Id) return Unit_Name_Type is 545 Uname_Chars : constant String := RTU_Id'Image (U_Id); 546 547 begin 548 Name_Len := Uname_Chars'Length; 549 Name_Buffer (1 .. Name_Len) := Uname_Chars; 550 Set_Casing (All_Lower_Case); 551 552 if U_Id in Ada_Child then 553 Name_Buffer (4) := '.'; 554 555 if U_Id in Ada_Calendar_Child then 556 Name_Buffer (13) := '.'; 557 558 elsif U_Id in Ada_Dispatching_Child then 559 Name_Buffer (16) := '.'; 560 561 elsif U_Id in Ada_Interrupts_Child then 562 Name_Buffer (15) := '.'; 563 564 elsif U_Id in Ada_Numerics_Child then 565 Name_Buffer (13) := '.'; 566 567 elsif U_Id in Ada_Real_Time_Child then 568 Name_Buffer (14) := '.'; 569 570 elsif U_Id in Ada_Streams_Child then 571 Name_Buffer (12) := '.'; 572 573 elsif U_Id in Ada_Strings_Child then 574 Name_Buffer (12) := '.'; 575 576 elsif U_Id in Ada_Text_IO_Child then 577 Name_Buffer (12) := '.'; 578 579 elsif U_Id in Ada_Wide_Text_IO_Child then 580 Name_Buffer (17) := '.'; 581 582 elsif U_Id in Ada_Wide_Wide_Text_IO_Child then 583 Name_Buffer (22) := '.'; 584 end if; 585 586 elsif U_Id in Interfaces_Child then 587 Name_Buffer (11) := '.'; 588 589 elsif U_Id in System_Child then 590 Name_Buffer (7) := '.'; 591 592 if U_Id in System_Dim_Child then 593 Name_Buffer (11) := '.'; 594 end if; 595 596 if U_Id in System_Multiprocessors_Child then 597 Name_Buffer (23) := '.'; 598 end if; 599 600 if U_Id in System_Storage_Pools_Child then 601 Name_Buffer (21) := '.'; 602 end if; 603 604 if U_Id in System_Strings_Child then 605 Name_Buffer (15) := '.'; 606 end if; 607 608 if U_Id in System_Tasking_Child then 609 Name_Buffer (15) := '.'; 610 end if; 611 612 if U_Id in System_Tasking_Restricted_Child then 613 Name_Buffer (26) := '.'; 614 end if; 615 616 if U_Id in System_Tasking_Protected_Objects_Child then 617 Name_Buffer (33) := '.'; 618 end if; 619 620 if U_Id in System_Tasking_Async_Delays_Child then 621 Name_Buffer (28) := '.'; 622 end if; 623 end if; 624 625 -- Add %s at end for spec 626 627 Name_Buffer (Name_Len + 1) := '%'; 628 Name_Buffer (Name_Len + 2) := 's'; 629 Name_Len := Name_Len + 2; 630 631 return Name_Find; 632 end Get_Unit_Name; 633 634 ---------------- 635 -- Initialize -- 636 ---------------- 637 638 procedure Initialize is 639 begin 640 -- Initialize the unit table 641 642 for J in RTU_Id loop 643 RT_Unit_Table (J).Entity := Empty; 644 end loop; 645 646 for J in RE_Id loop 647 RE_Table (J) := Empty; 648 end loop; 649 650 RTE_Is_Available := False; 651 end Initialize; 652 653 ------------ 654 -- Is_RTE -- 655 ------------ 656 657 function Is_RTE (Ent : Entity_Id; E : RE_Id) return Boolean is 658 E_Unit_Name : Unit_Name_Type; 659 Ent_Unit_Name : Unit_Name_Type; 660 661 S : Entity_Id; 662 E1 : Entity_Id; 663 E2 : Entity_Id; 664 665 begin 666 if No (Ent) then 667 return False; 668 669 -- If E has already a corresponding entity, check it directly, 670 -- going to full views if they exist to deal with the incomplete 671 -- and private type cases properly. 672 673 elsif Present (RE_Table (E)) then 674 E1 := Ent; 675 676 if Is_Type (E1) and then Present (Full_View (E1)) then 677 E1 := Full_View (E1); 678 end if; 679 680 E2 := RE_Table (E); 681 682 if Is_Type (E2) and then Present (Full_View (E2)) then 683 E2 := Full_View (E2); 684 end if; 685 686 return E1 = E2; 687 end if; 688 689 -- If the unit containing E is not loaded, we already know that the 690 -- entity we have cannot have come from this unit. 691 692 E_Unit_Name := Get_Unit_Name (RE_Unit_Table (E)); 693 694 if not Is_Loaded (E_Unit_Name) then 695 return False; 696 end if; 697 698 -- Here the unit containing the entity is loaded. We have not made 699 -- an explicit call to RTE to get the entity in question, but we may 700 -- have obtained a reference to it indirectly from some other entity 701 -- in the same unit, or some other unit that references it. 702 703 -- Get the defining unit of the entity 704 705 S := Scope (Ent); 706 707 if No (S) or else Ekind (S) /= E_Package then 708 return False; 709 end if; 710 711 Ent_Unit_Name := Get_Unit_Name (Unit_Declaration_Node (S)); 712 713 -- If the defining unit of the entity we are testing is not the 714 -- unit containing E, then they cannot possibly match. 715 716 if Ent_Unit_Name /= E_Unit_Name then 717 return False; 718 end if; 719 720 -- If the units match, then compare the names (remember that no 721 -- overloading is permitted in entities fetched using Rtsfind). 722 723 if RE_Chars (E) = Chars (Ent) then 724 RE_Table (E) := Ent; 725 726 -- If front-end inlining is enabled, we may be within a body that 727 -- contains inlined functions, which has not been retrieved through 728 -- rtsfind, and therefore is not yet recorded in the RT_Unit_Table. 729 -- Add the unit information now, it must be fully available. 730 731 declare 732 U : RT_Unit_Table_Record 733 renames RT_Unit_Table (RE_Unit_Table (E)); 734 begin 735 if No (U.Entity) then 736 U.Entity := S; 737 U.Uname := E_Unit_Name; 738 U.Unum := Get_Source_Unit (S); 739 end if; 740 end; 741 742 return True; 743 else 744 return False; 745 end if; 746 end Is_RTE; 747 748 ------------ 749 -- Is_RTU -- 750 ------------ 751 752 function Is_RTU (Ent : Entity_Id; U : RTU_Id) return Boolean is 753 E : constant Entity_Id := RT_Unit_Table (U).Entity; 754 begin 755 return Present (E) and then E = Ent; 756 end Is_RTU; 757 758 ----------------------------- 759 -- Is_Text_IO_Special_Unit -- 760 ----------------------------- 761 762 function Is_Text_IO_Special_Unit (Nam : Node_Id) return Boolean is 763 Prf : Node_Id; 764 Sel : Node_Id; 765 766 begin 767 if Nkind (Nam) /= N_Expanded_Name then 768 return False; 769 end if; 770 771 Prf := Prefix (Nam); 772 Sel := Selector_Name (Nam); 773 774 if Nkind (Sel) /= N_Expanded_Name 775 or else Nkind (Prf) /= N_Identifier 776 or else Chars (Prf) /= Name_Ada 777 then 778 return False; 779 end if; 780 781 Prf := Prefix (Sel); 782 Sel := Selector_Name (Sel); 783 784 return 785 Nkind (Prf) = N_Identifier 786 and then 787 Nam_In (Chars (Prf), Name_Text_IO, 788 Name_Wide_Text_IO, 789 Name_Wide_Wide_Text_IO) 790 and then Nkind (Sel) = N_Identifier 791 and then Chars (Sel) in Text_IO_Package_Name; 792 end Is_Text_IO_Special_Unit; 793 794 --------------- 795 -- Load_Fail -- 796 --------------- 797 798 procedure Load_Fail (S : String; U_Id : RTU_Id; Id : RE_Id) is 799 M : String (1 .. 100); 800 P : Natural := 0; 801 802 begin 803 -- Output header message 804 805 if Configurable_Run_Time_Mode then 806 RTE_Error_Msg ("construct not allowed in configurable run-time mode"); 807 else 808 RTE_Error_Msg ("run-time library configuration error"); 809 end if; 810 811 -- Output file name and reason string 812 813 M (1 .. 6) := "\file "; 814 P := 6; 815 816 Get_Name_String 817 (Get_File_Name (RT_Unit_Table (U_Id).Uname, Subunit => False)); 818 M (P + 1 .. P + Name_Len) := Name_Buffer (1 .. Name_Len); 819 P := P + Name_Len; 820 821 M (P + 1) := ' '; 822 P := P + 1; 823 824 M (P + 1 .. P + S'Length) := S; 825 P := P + S'Length; 826 827 RTE_Error_Msg (M (1 .. P)); 828 829 -- Output entity name 830 831 Output_Entity_Name (Id, "not available"); 832 833 -- In configurable run time mode, we raise RE_Not_Available, and the 834 -- caller is expected to deal gracefully with this. In the case of a 835 -- call to RTE_Available, this exception will be caught in Rtsfind, 836 -- and result in a returned value of False for the call. 837 838 if Configurable_Run_Time_Mode then 839 raise RE_Not_Available; 840 841 -- Here we have a load failure in normal full run time mode. See if we 842 -- are in the context of an RTE_Available call. If so, we just raise 843 -- RE_Not_Available. This can happen if a unit is unavailable, which 844 -- happens for example in the VM case, where the run-time is not 845 -- complete, but we do not regard it as a configurable run-time. 846 -- If the caller has done an explicit call to RTE_Available, then 847 -- clearly the caller is prepared to deal with a result of False. 848 849 elsif RTE_Available_Call then 850 RTE_Is_Available := False; 851 raise RE_Not_Available; 852 853 -- If we are not in the context of an RTE_Available call, we are really 854 -- trying to load an entity that is not there, and that should never 855 -- happen, so in this case we signal a fatal error. 856 857 else 858 raise Unrecoverable_Error; 859 end if; 860 end Load_Fail; 861 862 -------------- 863 -- Load_RTU -- 864 -------------- 865 866 procedure Load_RTU 867 (U_Id : RTU_Id; 868 Id : RE_Id := RE_Null; 869 Use_Setting : Boolean := False) 870 is 871 U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id); 872 Priv_Par : constant Elist_Id := New_Elmt_List; 873 Lib_Unit : Node_Id; 874 875 procedure Save_Private_Visibility; 876 -- If the current unit is the body of child unit or the spec of a 877 -- private child unit, the private declarations of the parent(s) are 878 -- visible. If the unit to be loaded is another public sibling, its 879 -- compilation will affect the visibility of the common ancestors. 880 -- Indicate those that must be restored. 881 882 procedure Restore_Private_Visibility; 883 -- Restore the visibility of ancestors after compiling RTU 884 885 -------------------------------- 886 -- Restore_Private_Visibility -- 887 -------------------------------- 888 889 procedure Restore_Private_Visibility is 890 E_Par : Elmt_Id; 891 892 begin 893 E_Par := First_Elmt (Priv_Par); 894 while Present (E_Par) loop 895 if not In_Private_Part (Node (E_Par)) then 896 Install_Private_Declarations (Node (E_Par)); 897 end if; 898 899 Next_Elmt (E_Par); 900 end loop; 901 end Restore_Private_Visibility; 902 903 ----------------------------- 904 -- Save_Private_Visibility -- 905 ----------------------------- 906 907 procedure Save_Private_Visibility is 908 Par : Entity_Id; 909 910 begin 911 Par := Scope (Current_Scope); 912 while Present (Par) 913 and then Par /= Standard_Standard 914 loop 915 if Ekind (Par) = E_Package 916 and then Is_Compilation_Unit (Par) 917 and then In_Private_Part (Par) 918 then 919 Append_Elmt (Par, Priv_Par); 920 end if; 921 922 Par := Scope (Par); 923 end loop; 924 end Save_Private_Visibility; 925 926 -- Local variables 927 928 Save_Ghost_Mode : constant Ghost_Mode_Type := Ghost_Mode; 929 930 -- Start of processing for Load_RTU 931 932 begin 933 -- Nothing to do if unit is already loaded 934 935 if Present (U.Entity) then 936 return; 937 end if; 938 939 -- Provide a clean environment for the unit 940 941 Ghost_Mode := None; 942 943 -- Note if secondary stack is used 944 945 if U_Id = System_Secondary_Stack then 946 Opt.Sec_Stack_Used := True; 947 end if; 948 949 -- Otherwise we need to load the unit, First build unit name 950 -- from the enumeration literal name in type RTU_Id. 951 952 U.Uname := Get_Unit_Name (U_Id); 953 U. First_Implicit_With := Empty; 954 955 -- Now do the load call, note that setting Error_Node to Empty is 956 -- a signal to Load_Unit that we will regard a failure to find the 957 -- file as a fatal error, and that it should not output any kind 958 -- of diagnostics, since we will take care of it here. 959 960 -- We save style checking switches and turn off style checking for 961 -- loading the unit, since we don't want any style checking. 962 963 declare 964 Save_Style_Check : constant Boolean := Style_Check; 965 begin 966 Style_Check := False; 967 U.Unum := 968 Load_Unit 969 (Load_Name => U.Uname, 970 Required => False, 971 Subunit => False, 972 Error_Node => Empty); 973 Style_Check := Save_Style_Check; 974 end; 975 976 -- Check for bad unit load 977 978 if U.Unum = No_Unit then 979 Load_Fail ("not found", U_Id, Id); 980 elsif Fatal_Error (U.Unum) = Error_Detected then 981 Load_Fail ("had parser errors", U_Id, Id); 982 end if; 983 984 -- Make sure that the unit is analyzed 985 986 declare 987 Was_Analyzed : constant Boolean := 988 Analyzed (Cunit (Current_Sem_Unit)); 989 990 begin 991 -- Pretend that the current unit is analyzed, in case it is System 992 -- or some such. This allows us to put some declarations, such as 993 -- exceptions and packed arrays of Boolean, into System even though 994 -- expanding them requires System... 995 996 -- This is a bit odd but works fine. If the RTS unit does not depend 997 -- in any way on the current unit, then it never gets back into the 998 -- current unit's tree, and the change we make to the current unit 999 -- tree is never noticed by anyone (it is undone in a moment). That 1000 -- is the normal situation. 1001 1002 -- If the RTS Unit *does* depend on the current unit, for instance, 1003 -- when you are compiling System, then you had better have finished 1004 -- analyzing the part of System that is depended on before you try to 1005 -- load the RTS Unit. This means having the code in System ordered in 1006 -- an appropriate manner. 1007 1008 Set_Analyzed (Cunit (Current_Sem_Unit), True); 1009 1010 if not Analyzed (Cunit (U.Unum)) then 1011 1012 -- If the unit is already loaded through a limited_with_clause, 1013 -- the relevant entities must already be available. We do not 1014 -- want to load and analyze the unit because this would create 1015 -- a real semantic dependence when the purpose of the limited_with 1016 -- is precisely to avoid such. 1017 1018 if From_Limited_With (Cunit_Entity (U.Unum)) then 1019 null; 1020 1021 else 1022 Save_Private_Visibility; 1023 Semantics (Cunit (U.Unum)); 1024 Restore_Private_Visibility; 1025 1026 if Fatal_Error (U.Unum) = Error_Detected then 1027 Load_Fail ("had semantic errors", U_Id, Id); 1028 end if; 1029 end if; 1030 end if; 1031 1032 -- Undo the pretence 1033 1034 Set_Analyzed (Cunit (Current_Sem_Unit), Was_Analyzed); 1035 end; 1036 1037 Lib_Unit := Unit (Cunit (U.Unum)); 1038 U.Entity := Defining_Entity (Lib_Unit); 1039 1040 if Use_Setting then 1041 Set_Is_Potentially_Use_Visible (U.Entity, True); 1042 end if; 1043 1044 Ghost_Mode := Save_Ghost_Mode; 1045 end Load_RTU; 1046 1047 -------------------- 1048 -- Make_Unit_Name -- 1049 -------------------- 1050 1051 function Make_Unit_Name 1052 (U : RT_Unit_Table_Record; 1053 N : Node_Id) return Node_Id is 1054 1055 Nam : Node_Id; 1056 Scop : Entity_Id; 1057 1058 begin 1059 Nam := New_Occurrence_Of (U.Entity, Standard_Location); 1060 Scop := Scope (U.Entity); 1061 1062 if Nkind (N) = N_Defining_Program_Unit_Name then 1063 while Scop /= Standard_Standard loop 1064 Nam := 1065 Make_Expanded_Name (Standard_Location, 1066 Chars => Chars (U.Entity), 1067 Prefix => New_Occurrence_Of (Scop, Standard_Location), 1068 Selector_Name => Nam); 1069 Set_Entity (Nam, U.Entity); 1070 1071 Scop := Scope (Scop); 1072 end loop; 1073 end if; 1074 1075 return Nam; 1076 end Make_Unit_Name; 1077 1078 -------------------- 1079 -- Maybe_Add_With -- 1080 -------------------- 1081 1082 procedure Maybe_Add_With (U : in out RT_Unit_Table_Record) is 1083 begin 1084 -- We do not need to generate a with_clause for a call issued from 1085 -- RTE_Component_Available. However, for CodePeer, we need these 1086 -- additional with's, because for a sequence like "if RTE_Available (X) 1087 -- then ... RTE (X)" the RTE call fails to create some necessary with's. 1088 1089 if RTE_Available_Call and not Generate_SCIL then 1090 return; 1091 end if; 1092 1093 -- Avoid creating directly self-referential with clauses 1094 1095 if Current_Sem_Unit = U.Unum then 1096 return; 1097 end if; 1098 1099 -- Add the with_clause, if we have not already added an implicit with 1100 -- for this unit to the current compilation unit. 1101 1102 declare 1103 LibUnit : constant Node_Id := Unit (Cunit (U.Unum)); 1104 Clause : Node_Id; 1105 Withn : Node_Id; 1106 1107 begin 1108 Clause := U.First_Implicit_With; 1109 while Present (Clause) loop 1110 if Parent (Clause) = Cunit (Current_Sem_Unit) then 1111 return; 1112 end if; 1113 1114 Clause := Next_Implicit_With (Clause); 1115 end loop; 1116 1117 Withn := 1118 Make_With_Clause (Standard_Location, 1119 Name => 1120 Make_Unit_Name 1121 (U, Defining_Unit_Name (Specification (LibUnit)))); 1122 1123 Set_Library_Unit (Withn, Cunit (U.Unum)); 1124 Set_Corresponding_Spec (Withn, U.Entity); 1125 Set_First_Name (Withn, True); 1126 Set_Implicit_With (Withn, True); 1127 Set_Next_Implicit_With (Withn, U.First_Implicit_With); 1128 1129 U.First_Implicit_With := Withn; 1130 1131 Mark_Rewrite_Insertion (Withn); 1132 Append (Withn, Context_Items (Cunit (Current_Sem_Unit))); 1133 Check_Restriction_No_Dependence (Name (Withn), Current_Error_Node); 1134 end; 1135 end Maybe_Add_With; 1136 1137 ------------------------ 1138 -- Output_Entity_Name -- 1139 ------------------------ 1140 1141 procedure Output_Entity_Name (Id : RE_Id; Msg : String) is 1142 M : String (1 .. 2048); 1143 P : Natural := 0; 1144 -- M (1 .. P) is current message to be output 1145 1146 RE_Image : constant String := RE_Id'Image (Id); 1147 1148 begin 1149 if Id = RE_Null then 1150 return; 1151 end if; 1152 1153 M (1 .. 9) := "\entity """; 1154 P := 9; 1155 1156 -- Add unit name to message, excluding %s or %b at end 1157 1158 Get_Name_String (Get_Unit_Name (RE_Unit_Table (Id))); 1159 Name_Len := Name_Len - 2; 1160 Set_Casing (Mixed_Case); 1161 M (P + 1 .. P + Name_Len) := Name_Buffer (1 .. Name_Len); 1162 P := P + Name_Len; 1163 1164 -- Add a qualifying period 1165 1166 M (P + 1) := '.'; 1167 P := P + 1; 1168 1169 -- Add entity name and closing quote to message 1170 1171 Name_Len := RE_Image'Length - 3; 1172 Name_Buffer (1 .. Name_Len) := RE_Image (4 .. RE_Image'Length); 1173 Set_Casing (Mixed_Case); 1174 M (P + 1 .. P + Name_Len) := Name_Buffer (1 .. Name_Len); 1175 P := P + Name_Len; 1176 M (P + 1) := '"'; 1177 P := P + 1; 1178 1179 -- Add message 1180 1181 M (P + 1) := ' '; 1182 P := P + 1; 1183 M (P + 1 .. P + Msg'Length) := Msg; 1184 P := P + Msg'Length; 1185 1186 -- Output message at current error node location 1187 1188 RTE_Error_Msg (M (1 .. P)); 1189 end Output_Entity_Name; 1190 1191 -------------- 1192 -- RE_Chars -- 1193 -------------- 1194 1195 function RE_Chars (E : RE_Id) return Name_Id is 1196 RE_Name_Chars : constant String := RE_Id'Image (E); 1197 1198 begin 1199 -- Copy name skipping initial RE_ or RO_XX characters 1200 1201 if RE_Name_Chars (1 .. 2) = "RE" then 1202 for J in 4 .. RE_Name_Chars'Last loop 1203 Name_Buffer (J - 3) := Fold_Lower (RE_Name_Chars (J)); 1204 end loop; 1205 1206 Name_Len := RE_Name_Chars'Length - 3; 1207 1208 else 1209 for J in 7 .. RE_Name_Chars'Last loop 1210 Name_Buffer (J - 6) := Fold_Lower (RE_Name_Chars (J)); 1211 end loop; 1212 1213 Name_Len := RE_Name_Chars'Length - 6; 1214 end if; 1215 1216 return Name_Find; 1217 end RE_Chars; 1218 1219 --------- 1220 -- RTE -- 1221 --------- 1222 1223 function RTE (E : RE_Id) return Entity_Id is 1224 U_Id : constant RTU_Id := RE_Unit_Table (E); 1225 U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id); 1226 1227 Lib_Unit : Node_Id; 1228 Pkg_Ent : Entity_Id; 1229 Ename : Name_Id; 1230 1231 -- The following flag is used to disable front-end inlining when RTE 1232 -- is invoked. This prevents the analysis of other runtime bodies when 1233 -- a particular spec is loaded through Rtsfind. This is both efficient, 1234 -- and it prevents spurious visibility conflicts between use-visible 1235 -- user entities, and entities in run-time packages. 1236 1237 Save_Front_End_Inlining : Boolean; 1238 1239 procedure Check_RPC; 1240 -- Reject programs that make use of distribution features not supported 1241 -- on the current target. Also check that the PCS is compatible with the 1242 -- code generator version. On such targets (Vxworks, others?) we provide 1243 -- a minimal body for System.Rpc that only supplies an implementation of 1244 -- Partition_Id. 1245 1246 function Find_Local_Entity (E : RE_Id) return Entity_Id; 1247 -- This function is used when entity E is in this compilation's main 1248 -- unit. It gets the value from the already compiled declaration. 1249 1250 --------------- 1251 -- Check_RPC -- 1252 --------------- 1253 1254 procedure Check_RPC is 1255 begin 1256 -- Bypass this check if debug flag -gnatdR set 1257 1258 if Debug_Flag_RR then 1259 return; 1260 end if; 1261 1262 -- Otherwise we need the check if we are going after one of the 1263 -- critical entities in System.RPC / System.Partition_Interface. 1264 1265 if E = RE_Do_Rpc 1266 or else 1267 E = RE_Do_Apc 1268 or else 1269 E = RE_Params_Stream_Type 1270 or else 1271 E = RE_Request_Access 1272 then 1273 -- If generating RCI stubs, check that we have a real PCS 1274 1275 if (Distribution_Stub_Mode = Generate_Receiver_Stub_Body 1276 or else 1277 Distribution_Stub_Mode = Generate_Caller_Stub_Body) 1278 and then Get_PCS_Name = Name_No_DSA 1279 then 1280 Set_Standard_Error; 1281 Write_Str ("distribution feature not supported"); 1282 Write_Eol; 1283 raise Unrecoverable_Error; 1284 1285 -- In all cases, check Exp_Dist and System.Partition_Interface 1286 -- consistency. 1287 1288 elsif Get_PCS_Version /= 1289 Exp_Dist.PCS_Version_Number (Get_PCS_Name) 1290 then 1291 Set_Standard_Error; 1292 Write_Str ("PCS version mismatch: expander "); 1293 Write_Int (Exp_Dist.PCS_Version_Number (Get_PCS_Name)); 1294 Write_Str (", PCS ("); 1295 Write_Name (Get_PCS_Name); 1296 Write_Str (") "); 1297 Write_Int (Get_PCS_Version); 1298 Write_Eol; 1299 raise Unrecoverable_Error; 1300 end if; 1301 end if; 1302 end Check_RPC; 1303 1304 ----------------------- 1305 -- Find_Local_Entity -- 1306 ----------------------- 1307 1308 function Find_Local_Entity (E : RE_Id) return Entity_Id is 1309 RE_Str : constant String := RE_Id'Image (E); 1310 Nam : Name_Id; 1311 Ent : Entity_Id; 1312 1313 Save_Nam : constant String := Name_Buffer (1 .. Name_Len); 1314 -- Save name buffer and length over call 1315 1316 begin 1317 Name_Len := Natural'Max (0, RE_Str'Length - 3); 1318 Name_Buffer (1 .. Name_Len) := 1319 RE_Str (RE_Str'First + 3 .. RE_Str'Last); 1320 1321 Nam := Name_Find; 1322 Ent := Entity_Id (Get_Name_Table_Int (Nam)); 1323 1324 Name_Len := Save_Nam'Length; 1325 Name_Buffer (1 .. Name_Len) := Save_Nam; 1326 1327 return Ent; 1328 end Find_Local_Entity; 1329 1330 -- Start of processing for RTE 1331 1332 begin 1333 -- Doing a rtsfind in system.ads is special, as we cannot do this 1334 -- when compiling System itself. So if we are compiling system then 1335 -- we should already have acquired and processed the declaration 1336 -- of the entity. The test is to see if this compilation's main unit 1337 -- is System. If so, return the value from the already compiled 1338 -- declaration and otherwise do a regular find. 1339 1340 -- Not pleasant, but these kinds of annoying recursion when 1341 -- writing an Ada compiler in Ada have to be broken somewhere. 1342 1343 if Present (Main_Unit_Entity) 1344 and then Chars (Main_Unit_Entity) = Name_System 1345 and then Analyzed (Main_Unit_Entity) 1346 and then not Is_Child_Unit (Main_Unit_Entity) 1347 then 1348 return Check_CRT (E, Find_Local_Entity (E)); 1349 end if; 1350 1351 Save_Front_End_Inlining := Front_End_Inlining; 1352 Front_End_Inlining := False; 1353 1354 -- Load unit if unit not previously loaded 1355 1356 if No (RE_Table (E)) then 1357 Load_RTU (U_Id, Id => E); 1358 Lib_Unit := Unit (Cunit (U.Unum)); 1359 1360 -- In the subprogram case, we are all done, the entity we want 1361 -- is the entity for the subprogram itself. Note that we do not 1362 -- bother to check that it is the entity that was requested. 1363 -- the only way that could fail to be the case is if runtime is 1364 -- hopelessly misconfigured, and it isn't worth testing for this. 1365 1366 if Nkind (Lib_Unit) = N_Subprogram_Declaration then 1367 RE_Table (E) := U.Entity; 1368 1369 -- Otherwise we must have the package case. First check package 1370 -- entity itself (e.g. RTE_Name for System.Interrupts.Name) 1371 1372 else 1373 pragma Assert (Nkind (Lib_Unit) = N_Package_Declaration); 1374 Ename := RE_Chars (E); 1375 1376 -- First we search the package entity chain. If the package 1377 -- only has a limited view, scan the corresponding list of 1378 -- incomplete types. 1379 1380 if From_Limited_With (U.Entity) then 1381 Pkg_Ent := First_Entity (Limited_View (U.Entity)); 1382 else 1383 Pkg_Ent := First_Entity (U.Entity); 1384 end if; 1385 1386 while Present (Pkg_Ent) loop 1387 if Ename = Chars (Pkg_Ent) then 1388 RE_Table (E) := Pkg_Ent; 1389 Check_RPC; 1390 goto Found; 1391 end if; 1392 1393 Next_Entity (Pkg_Ent); 1394 end loop; 1395 1396 -- If we did not find the entity in the package entity chain, 1397 -- then check if the package entity itself matches. Note that 1398 -- we do this check after searching the entity chain, since 1399 -- the rule is that in case of ambiguity, we prefer the entity 1400 -- defined within the package, rather than the package itself. 1401 1402 if Ename = Chars (U.Entity) then 1403 RE_Table (E) := U.Entity; 1404 end if; 1405 1406 -- If we didn't find the entity we want, something is wrong. 1407 -- We just leave RE_Table (E) set to Empty and the appropriate 1408 -- action will be taken by Check_CRT when we exit. 1409 1410 end if; 1411 end if; 1412 1413 <<Found>> 1414 Maybe_Add_With (U); 1415 1416 Front_End_Inlining := Save_Front_End_Inlining; 1417 return Check_CRT (E, RE_Table (E)); 1418 end RTE; 1419 1420 ------------------- 1421 -- RTE_Available -- 1422 ------------------- 1423 1424 function RTE_Available (E : RE_Id) return Boolean is 1425 Dummy : Entity_Id; 1426 pragma Warnings (Off, Dummy); 1427 1428 Result : Boolean; 1429 1430 Save_RTE_Available_Call : constant Boolean := RTE_Available_Call; 1431 Save_RTE_Is_Available : constant Boolean := RTE_Is_Available; 1432 -- These are saved recursively because the call to load a unit 1433 -- caused by an upper level call may perform a recursive call 1434 -- to this routine during analysis of the corresponding unit. 1435 1436 begin 1437 RTE_Available_Call := True; 1438 RTE_Is_Available := True; 1439 Dummy := RTE (E); 1440 Result := RTE_Is_Available; 1441 RTE_Available_Call := Save_RTE_Available_Call; 1442 RTE_Is_Available := Save_RTE_Is_Available; 1443 return Result; 1444 1445 exception 1446 when RE_Not_Available => 1447 RTE_Available_Call := Save_RTE_Available_Call; 1448 RTE_Is_Available := Save_RTE_Is_Available; 1449 return False; 1450 end RTE_Available; 1451 1452 -------------------------- 1453 -- RTE_Record_Component -- 1454 -------------------------- 1455 1456 function RTE_Record_Component (E : RE_Id) return Entity_Id is 1457 U_Id : constant RTU_Id := RE_Unit_Table (E); 1458 U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id); 1459 E1 : Entity_Id; 1460 Ename : Name_Id; 1461 Found_E : Entity_Id; 1462 Lib_Unit : Node_Id; 1463 Pkg_Ent : Entity_Id; 1464 1465 -- The following flag is used to disable front-end inlining when 1466 -- RTE_Record_Component is invoked. This prevents the analysis of other 1467 -- runtime bodies when a particular spec is loaded through Rtsfind. This 1468 -- is both efficient, and it prevents spurious visibility conflicts 1469 -- between use-visible user entities, and entities in run-time packages. 1470 1471 Save_Front_End_Inlining : Boolean; 1472 1473 begin 1474 -- Note: Contrary to subprogram RTE, there is no need to do any special 1475 -- management with package system.ads because it has no record type 1476 -- declarations. 1477 1478 Save_Front_End_Inlining := Front_End_Inlining; 1479 Front_End_Inlining := False; 1480 1481 -- Load unit if unit not previously loaded 1482 1483 if not Present (U.Entity) then 1484 Load_RTU (U_Id, Id => E); 1485 end if; 1486 1487 Lib_Unit := Unit (Cunit (U.Unum)); 1488 1489 pragma Assert (Nkind (Lib_Unit) = N_Package_Declaration); 1490 Ename := RE_Chars (E); 1491 1492 -- Search the entity in the components of record type declarations 1493 -- found in the package entity chain. 1494 1495 Found_E := Empty; 1496 Pkg_Ent := First_Entity (U.Entity); 1497 Search : while Present (Pkg_Ent) loop 1498 if Is_Record_Type (Pkg_Ent) then 1499 E1 := First_Entity (Pkg_Ent); 1500 while Present (E1) loop 1501 if Ename = Chars (E1) then 1502 pragma Assert (not Present (Found_E)); 1503 Found_E := E1; 1504 end if; 1505 1506 Next_Entity (E1); 1507 end loop; 1508 end if; 1509 1510 Next_Entity (Pkg_Ent); 1511 end loop Search; 1512 1513 -- If we didn't find the entity we want, something is wrong. The 1514 -- appropriate action will be taken by Check_CRT when we exit. 1515 1516 Maybe_Add_With (U); 1517 1518 Front_End_Inlining := Save_Front_End_Inlining; 1519 return Check_CRT (E, Found_E); 1520 end RTE_Record_Component; 1521 1522 ------------------------------------ 1523 -- RTE_Record_Component_Available -- 1524 ------------------------------------ 1525 1526 function RTE_Record_Component_Available (E : RE_Id) return Boolean is 1527 Dummy : Entity_Id; 1528 pragma Warnings (Off, Dummy); 1529 1530 Result : Boolean; 1531 1532 Save_RTE_Available_Call : constant Boolean := RTE_Available_Call; 1533 Save_RTE_Is_Available : constant Boolean := RTE_Is_Available; 1534 -- These are saved recursively because the call to load a unit 1535 -- caused by an upper level call may perform a recursive call 1536 -- to this routine during analysis of the corresponding unit. 1537 1538 begin 1539 RTE_Available_Call := True; 1540 RTE_Is_Available := True; 1541 Dummy := RTE_Record_Component (E); 1542 Result := RTE_Is_Available; 1543 RTE_Available_Call := Save_RTE_Available_Call; 1544 RTE_Is_Available := Save_RTE_Is_Available; 1545 return Result; 1546 1547 exception 1548 when RE_Not_Available => 1549 RTE_Available_Call := Save_RTE_Available_Call; 1550 RTE_Is_Available := Save_RTE_Is_Available; 1551 return False; 1552 end RTE_Record_Component_Available; 1553 1554 ------------------- 1555 -- RTE_Error_Msg -- 1556 ------------------- 1557 1558 procedure RTE_Error_Msg (Msg : String) is 1559 begin 1560 if RTE_Available_Call then 1561 RTE_Is_Available := False; 1562 else 1563 Error_Msg_N (Msg, Current_Error_Node); 1564 1565 -- Bump count of violations if we are in configurable run-time 1566 -- mode and this is not a continuation message. 1567 1568 if Configurable_Run_Time_Mode and then Msg (Msg'First) /= '\' then 1569 Configurable_Run_Time_Violations := 1570 Configurable_Run_Time_Violations + 1; 1571 end if; 1572 end if; 1573 end RTE_Error_Msg; 1574 1575 ---------------- 1576 -- RTU_Entity -- 1577 ---------------- 1578 1579 function RTU_Entity (U : RTU_Id) return Entity_Id is 1580 begin 1581 return RT_Unit_Table (U).Entity; 1582 end RTU_Entity; 1583 1584 ---------------- 1585 -- RTU_Loaded -- 1586 ---------------- 1587 1588 function RTU_Loaded (U : RTU_Id) return Boolean is 1589 begin 1590 return Present (RT_Unit_Table (U).Entity); 1591 end RTU_Loaded; 1592 1593 -------------------- 1594 -- Set_RTU_Loaded -- 1595 -------------------- 1596 1597 procedure Set_RTU_Loaded (N : Node_Id) is 1598 Loc : constant Source_Ptr := Sloc (N); 1599 Unum : constant Unit_Number_Type := Get_Source_Unit (Loc); 1600 Uname : constant Unit_Name_Type := Unit_Name (Unum); 1601 E : constant Entity_Id := 1602 Defining_Entity (Unit (Cunit (Unum))); 1603 begin 1604 pragma Assert (Is_Predefined_File_Name (Unit_File_Name (Unum))); 1605 1606 -- Loop through entries in RTU table looking for matching entry 1607 1608 for U_Id in RTU_Id'Range loop 1609 1610 -- Here we have a match 1611 1612 if Get_Unit_Name (U_Id) = Uname then 1613 declare 1614 U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id); 1615 -- The RT_Unit_Table entry that may need updating 1616 1617 begin 1618 -- If entry is not set, set it now, and indicate that it was 1619 -- loaded through an explicit context clause. 1620 1621 if No (U.Entity) then 1622 U := (Entity => E, 1623 Uname => Get_Unit_Name (U_Id), 1624 Unum => Unum, 1625 First_Implicit_With => Empty); 1626 end if; 1627 1628 return; 1629 end; 1630 end if; 1631 end loop; 1632 end Set_RTU_Loaded; 1633 1634end Rtsfind; 1635