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) 1992-2019, Free Software Foundation, Inc. -- 10-- -- 11-- GNAT is free software; you can redistribute it and/or modify it under -- 12-- terms of the GNU General Public License as published by the Free Soft- -- 13-- ware Foundation; either version 3, or (at your option) any later ver- -- 14-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 15-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 16-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- 17-- for more details. You should have received a copy of the GNU General -- 18-- Public License distributed with GNAT; see file COPYING3. If not, go to -- 19-- http://www.gnu.org/licenses for a complete copy of the license. -- 20-- -- 21-- GNAT was originally developed by the GNAT team at New York University. -- 22-- Extensive contributions were provided by Ada Core Technologies Inc. -- 23-- -- 24------------------------------------------------------------------------------ 25 26with Atree; use Atree; 27with 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; 34with Fname; use Fname; 35with Fname.UF; use Fname.UF; 36with Ghost; use Ghost; 37with Lib; use Lib; 38with Lib.Load; use Lib.Load; 39with Namet; use Namet; 40with Nlists; use Nlists; 41with Nmake; use Nmake; 42with Output; use Output; 43with Opt; use Opt; 44with Restrict; use Restrict; 45with Sem; use Sem; 46with Sem_Aux; use Sem_Aux; 47with Sem_Ch7; use Sem_Ch7; 48with Sem_Dist; use Sem_Dist; 49with Sem_Util; use Sem_Util; 50with Sinfo; use Sinfo; 51with Stand; use Stand; 52with Snames; use Snames; 53with Tbuild; use Tbuild; 54with Uname; use Uname; 55 56package body Rtsfind is 57 58 RTE_Available_Call : Boolean := False; 59 -- Set True during call to RTE from RTE_Available (or from call to 60 -- RTE_Record_Component from RTE_Record_Component_Available). Tells 61 -- the called subprogram to set RTE_Is_Available to False rather than 62 -- generating an error message. 63 64 RTE_Is_Available : Boolean; 65 -- Set True by RTE_Available on entry. When RTE_Available_Call is set 66 -- True, set False if RTE would otherwise generate an error message. 67 68 ---------------- 69 -- Unit table -- 70 ---------------- 71 72 -- The unit table has one entry for each unit included in the definition 73 -- of the type RTU_Id in the spec. The table entries are initialized in 74 -- Initialize to set the Entity field to Empty, indicating that the 75 -- corresponding unit has not yet been loaded. The fields are set when 76 -- a unit is loaded to contain the defining entity for the unit, the 77 -- unit name, and the unit number. 78 79 -- Note that a unit can be loaded either by a call to find an entity 80 -- within the unit (e.g. RTE), or by an explicit with of the unit. In 81 -- the latter case it is critical to make a call to Set_RTU_Loaded to 82 -- ensure that the entry in this table reflects the load. 83 84 -- A unit retrieved through rtsfind may end up in the context of several 85 -- other units, in addition to the main unit. These additional with_clauses 86 -- are needed to generate a proper traversal order for CodePeer. To 87 -- minimize somewhat the redundancy created by numerous calls to rtsfind 88 -- from different units, we keep track of the list of implicit with_clauses 89 -- already created for the current loaded unit. 90 91 type RT_Unit_Table_Record is record 92 Entity : Entity_Id; 93 Uname : Unit_Name_Type; 94 First_Implicit_With : Node_Id; 95 Unum : Unit_Number_Type; 96 end record; 97 98 RT_Unit_Table : array (RTU_Id) of RT_Unit_Table_Record; 99 100 -------------------------- 101 -- Runtime Entity Table -- 102 -------------------------- 103 104 -- There is one entry in the runtime entity table for each entity that is 105 -- included in the definition of the RE_Id type in the spec. The entries 106 -- are set by Initialize_Rtsfind to contain Empty, indicating that the 107 -- entity has not yet been located. Once the entity is located for the 108 -- first time, its ID is stored in this array, so that subsequent calls 109 -- for the same entity can be satisfied immediately. 110 111 -- NOTE: In order to avoid conflicts between record components and subprgs 112 -- that have the same name (i.e. subprogram External_Tag and 113 -- component External_Tag of package Ada.Tags) this table is not used 114 -- with Record_Components. 115 116 RE_Table : array (RE_Id) of Entity_Id; 117 118 -------------------------------- 119 -- Generation of with_clauses -- 120 -------------------------------- 121 122 -- When a unit is implicitly loaded as a result of a call to RTE, it is 123 -- necessary to create one or two implicit with_clauses. We add such 124 -- with_clauses to the extended main unit if needed, and also to whatever 125 -- unit needs them, which is not necessarily the main unit. The former 126 -- ensures that the object is correctly loaded by the binder. The latter 127 -- is necessary for CodePeer. 128 129 -- The field First_Implicit_With in the unit table record are used to 130 -- avoid creating duplicate with_clauses. 131 132 ---------------------------------------------- 133 -- Table of Predefined RE_Id Error Messages -- 134 ---------------------------------------------- 135 136 -- If an attempt is made to load an entity, given an RE_Id value, and the 137 -- entity is not available in the current configuration, an error message 138 -- is given (see Entity_Not_Defined below). The general form of such an 139 -- error message is for example: 140 141 -- entity "System.Pack_43.Bits_43" not defined 142 143 -- The following table defines a set of RE_Id image values for which this 144 -- error message is specialized and replaced by specific text indicating 145 -- the exact message to be output. For example, in the case above, for the 146 -- RE_Id value RE_Bits_43, we do indeed specialize the message, and the 147 -- above generic message is replaced by: 148 149 -- packed component size of 43 is not supported 150 151 type CString_Ptr is access constant String; 152 153 type PRE_Id_Entry is record 154 Str : CString_Ptr; 155 -- Pointer to string with the RE_Id image. The sequence ?? may appear 156 -- in which case it will match any characters in the RE_Id image value. 157 -- This is used to avoid the need for dozens of entries for RE_Bits_??. 158 159 Msg : CString_Ptr; 160 -- Pointer to string with the corresponding error text. The sequence 161 -- ?? may appear, in which case, it is replaced by the corresponding 162 -- sequence ?? in the Str value (if the first ? is zero, then it is 163 -- omitted from the message). 164 end record; 165 166 Str1 : aliased constant String := "RE_BITS_??"; 167 Str2 : aliased constant String := "RE_GET_??"; 168 Str3 : aliased constant String := "RE_SET_??"; 169 Str4 : aliased constant String := "RE_CALL_SIMPLE"; 170 171 MsgPack : aliased constant String := 172 "packed component size of ?? is not supported"; 173 MsgRV : aliased constant String := 174 "task rendezvous is not supported"; 175 176 PRE_Id_Table : constant array (Natural range <>) of PRE_Id_Entry := 177 (1 => (Str1'Access, MsgPack'Access), 178 2 => (Str2'Access, MsgPack'Access), 179 3 => (Str3'Access, MsgPack'Access), 180 4 => (Str4'Access, MsgRV'Access)); 181 -- We will add entries to this table as we find cases where it is a good 182 -- idea to do so. By no means all the RE_Id values need entries, because 183 -- the expander often gives clear messages before it makes the Rtsfind 184 -- call expecting to find the entity. 185 186 ----------------------- 187 -- Local Subprograms -- 188 ----------------------- 189 190 function Check_CRT (E : RE_Id; Eid : Entity_Id) return Entity_Id; 191 -- Check entity Eid to ensure that configurable run-time restrictions are 192 -- met. May generate an error message (if RTE_Available_Call is false) and 193 -- raise RE_Not_Available if entity E does not exist (e.g. Eid is Empty). 194 -- Also check that entity is not overloaded. 195 196 procedure Entity_Not_Defined (Id : RE_Id); 197 -- Outputs error messages for an entity that is not defined in the run-time 198 -- library (the form of the error message is tailored for no run time or 199 -- configurable run time mode as required). See also table of pre-defined 200 -- messages for entities above (RE_Id_Messages). 201 202 function Get_Unit_Name (U_Id : RTU_Id) return Unit_Name_Type; 203 -- Retrieves the Unit Name given a unit id represented by its enumeration 204 -- value in RTU_Id. 205 206 procedure Load_Fail (S : String; U_Id : RTU_Id; Id : RE_Id); 207 pragma No_Return (Load_Fail); 208 -- Internal procedure called if we can't successfully locate or process a 209 -- run-time unit. The parameters give information about the error message 210 -- to be given. S is a reason for failing to compile the file and U_Id is 211 -- the unit id. RE_Id is the RE_Id originally passed to RTE. The message in 212 -- S is one of the following: 213 -- 214 -- "not found" 215 -- "had parser errors" 216 -- "had semantic errors" 217 -- 218 -- The "not found" case is treated specially in that it is considered 219 -- a normal situation in configurable run-time mode, and generates 220 -- a warning, but is otherwise ignored. 221 222 procedure Load_RTU 223 (U_Id : RTU_Id; 224 Id : RE_Id := RE_Null; 225 Use_Setting : Boolean := False); 226 -- Load the unit whose Id is given if not already loaded. The unit is 227 -- loaded and analyzed, and the entry in RT_Unit_Table is updated to 228 -- reflect the load. Use_Setting is used to indicate the initial setting 229 -- for the Is_Potentially_Use_Visible flag of the entity for the loaded 230 -- unit (if it is indeed loaded). A value of False means nothing special 231 -- need be done. A value of True indicates that this flag must be set to 232 -- True. It is needed only in the Check_Text_IO_Special_Unit procedure, 233 -- which may materialize an entity of Text_IO (or [Wide_]Wide_Text_IO) that 234 -- was previously unknown. Id is the RE_Id value of the entity which was 235 -- originally requested. Id is used only for error message detail, and if 236 -- it is RE_Null, then the attempt to output the entity name is ignored. 237 238 function Make_Unit_Name 239 (U : RT_Unit_Table_Record; 240 N : Node_Id) return Node_Id; 241 -- If the unit is a child unit, build fully qualified name for use in 242 -- With_Clause. 243 244 procedure Maybe_Add_With (U : in out RT_Unit_Table_Record); 245 -- If necessary, add an implicit with_clause from the current unit to the 246 -- one represented by U. 247 248 procedure Output_Entity_Name (Id : RE_Id; Msg : String); 249 -- Output continuation error message giving qualified name of entity 250 -- corresponding to Id, appending the string given by Msg. 251 252 function RE_Chars (E : RE_Id) return Name_Id; 253 -- Given a RE_Id value returns the Chars of the corresponding entity 254 255 procedure RTE_Error_Msg (Msg : String); 256 -- Generates a message by calling Error_Msg_N specifying Current_Error_Node 257 -- as the node location using the given Msg text. Special processing in the 258 -- case where RTE_Available_Call is set. In this case, no message is output 259 -- and instead RTE_Is_Available is set to False. Note that this can only be 260 -- used if you are sure that the message comes directly or indirectly from 261 -- a call to the RTE function. 262 263 --------------- 264 -- Check_CRT -- 265 --------------- 266 267 function Check_CRT (E : RE_Id; Eid : Entity_Id) return Entity_Id is 268 U_Id : constant RTU_Id := RE_Unit_Table (E); 269 270 begin 271 if No (Eid) then 272 if RTE_Available_Call then 273 RTE_Is_Available := False; 274 else 275 Entity_Not_Defined (E); 276 end if; 277 278 raise RE_Not_Available; 279 280 -- Entity is available 281 282 else 283 -- If in No_Run_Time mode and entity is neither in the current unit 284 -- nor in one of the specially permitted units, raise the exception. 285 286 if No_Run_Time_Mode 287 and then not OK_No_Run_Time_Unit (U_Id) 288 289 -- If the entity being referenced is defined in the current scope, 290 -- using it is always fine as such usage can never introduce any 291 -- dependency on an additional unit. The presence of this test 292 -- helps generating meaningful error messages for CRT violations. 293 294 and then Scope (Eid) /= Current_Scope 295 then 296 Entity_Not_Defined (E); 297 raise RE_Not_Available; 298 end if; 299 300 -- Check entity is not overloaded, checking for special exceptions 301 302 if Has_Homonym (Eid) 303 and then E /= RE_Save_Occurrence 304 then 305 Set_Standard_Error; 306 Write_Str ("Run-time configuration error ("); 307 Write_Str ("rtsfind entity """); 308 Get_Decoded_Name_String (Chars (Eid)); 309 Set_Casing (Mixed_Case); 310 Write_Str (Name_Buffer (1 .. Name_Len)); 311 Write_Str (""" is overloaded)"); 312 Write_Eol; 313 raise Unrecoverable_Error; 314 end if; 315 316 -- Otherwise entity is accessible 317 318 return Eid; 319 end if; 320 end Check_CRT; 321 322 -------------------------------- 323 -- Check_Text_IO_Special_Unit -- 324 -------------------------------- 325 326 procedure Check_Text_IO_Special_Unit (Nam : Node_Id) is 327 Chrs : Name_Id; 328 329 type Name_Map_Type is array (Text_IO_Package_Name) of RTU_Id; 330 331 Name_Map : constant Name_Map_Type := Name_Map_Type'( 332 Name_Decimal_IO => Ada_Text_IO_Decimal_IO, 333 Name_Enumeration_IO => Ada_Text_IO_Enumeration_IO, 334 Name_Fixed_IO => Ada_Text_IO_Fixed_IO, 335 Name_Float_IO => Ada_Text_IO_Float_IO, 336 Name_Integer_IO => Ada_Text_IO_Integer_IO, 337 Name_Modular_IO => Ada_Text_IO_Modular_IO); 338 339 Wide_Name_Map : constant Name_Map_Type := Name_Map_Type'( 340 Name_Decimal_IO => Ada_Wide_Text_IO_Decimal_IO, 341 Name_Enumeration_IO => Ada_Wide_Text_IO_Enumeration_IO, 342 Name_Fixed_IO => Ada_Wide_Text_IO_Fixed_IO, 343 Name_Float_IO => Ada_Wide_Text_IO_Float_IO, 344 Name_Integer_IO => Ada_Wide_Text_IO_Integer_IO, 345 Name_Modular_IO => Ada_Wide_Text_IO_Modular_IO); 346 347 Wide_Wide_Name_Map : constant Name_Map_Type := Name_Map_Type'( 348 Name_Decimal_IO => Ada_Wide_Wide_Text_IO_Decimal_IO, 349 Name_Enumeration_IO => Ada_Wide_Wide_Text_IO_Enumeration_IO, 350 Name_Fixed_IO => Ada_Wide_Wide_Text_IO_Fixed_IO, 351 Name_Float_IO => Ada_Wide_Wide_Text_IO_Float_IO, 352 Name_Integer_IO => Ada_Wide_Wide_Text_IO_Integer_IO, 353 Name_Modular_IO => Ada_Wide_Wide_Text_IO_Modular_IO); 354 355 To_Load : RTU_Id; 356 -- Unit to be loaded, from one of the above maps 357 358 begin 359 -- Nothing to do if name is not an identifier or a selected component 360 -- whose selector_name is an identifier. 361 362 if Nkind (Nam) = N_Identifier then 363 Chrs := Chars (Nam); 364 365 elsif Nkind (Nam) = N_Selected_Component 366 and then Nkind (Selector_Name (Nam)) = N_Identifier 367 then 368 Chrs := Chars (Selector_Name (Nam)); 369 370 else 371 return; 372 end if; 373 374 -- Nothing to do if name is not one of the Text_IO subpackages 375 -- Otherwise look through loaded units, and if we find Text_IO 376 -- or [Wide_]Wide_Text_IO already loaded, then load the proper child. 377 378 if Chrs in Text_IO_Package_Name then 379 for U in Main_Unit .. Last_Unit loop 380 Get_Name_String (Unit_File_Name (U)); 381 382 if Name_Len = 12 then 383 384 -- Here is where we do the loads if we find one of the units 385 -- Ada.Text_IO or Ada.[Wide_]Wide_Text_IO. An interesting 386 -- detail is that these units may already be used (i.e. their 387 -- In_Use flags may be set). Normally when the In_Use flag is 388 -- set, the Is_Potentially_Use_Visible flag of all entities in 389 -- the package is set, but the new entity we are mysteriously 390 -- adding was not there to have its flag set at the time. So 391 -- that's why we pass the extra parameter to RTU_Find, to make 392 -- sure the flag does get set now. Given that those generic 393 -- packages are in fact child units, we must indicate that 394 -- they are visible. 395 396 if Name_Buffer (1 .. 12) = "a-textio.ads" then 397 To_Load := Name_Map (Chrs); 398 399 elsif Name_Buffer (1 .. 12) = "a-witeio.ads" then 400 To_Load := Wide_Name_Map (Chrs); 401 402 elsif Name_Buffer (1 .. 12) = "a-ztexio.ads" then 403 To_Load := Wide_Wide_Name_Map (Chrs); 404 405 else 406 goto Continue; 407 end if; 408 409 Load_RTU (To_Load, Use_Setting => In_Use (Cunit_Entity (U))); 410 Set_Is_Visible_Lib_Unit (RT_Unit_Table (To_Load).Entity); 411 412 -- Prevent creation of an implicit 'with' from (for example) 413 -- Ada.Wide_Text_IO.Integer_IO to Ada.Text_IO.Integer_IO, 414 -- because these could create cycles. First check whether the 415 -- simple names match ("integer_io" = "integer_io"), and then 416 -- check whether the parent is indeed one of the 417 -- [[Wide_]Wide_]Text_IO packages. 418 419 if Chrs = Chars (Cunit_Entity (Current_Sem_Unit)) then 420 declare 421 Parent_Name : constant Unit_Name_Type := 422 Get_Parent_Spec_Name 423 (Unit_Name (Current_Sem_Unit)); 424 425 begin 426 if Parent_Name /= No_Unit_Name then 427 Get_Name_String (Parent_Name); 428 429 declare 430 P : String renames Name_Buffer (1 .. Name_Len); 431 begin 432 if P = "ada.text_io%s" or else 433 P = "ada.wide_text_io%s" or else 434 P = "ada.wide_wide_text_io%s" 435 then 436 goto Continue; 437 end if; 438 end; 439 end if; 440 end; 441 end if; 442 443 -- Add an implicit with clause from the current unit to the 444 -- [[Wide_]Wide_]Text_IO child (if necessary). 445 446 Maybe_Add_With (RT_Unit_Table (To_Load)); 447 end if; 448 449 <<Continue>> null; 450 end loop; 451 end if; 452 453 exception 454 -- Generate error message if run-time unit not available 455 456 when RE_Not_Available => 457 Error_Msg_N ("& not available", Nam); 458 end Check_Text_IO_Special_Unit; 459 460 ------------------------ 461 -- Entity_Not_Defined -- 462 ------------------------ 463 464 procedure Entity_Not_Defined (Id : RE_Id) is 465 begin 466 if No_Run_Time_Mode then 467 468 -- If the error occurs when compiling the body of a predefined 469 -- unit for inlining purposes, the body must be illegal in this 470 -- mode, and there is no point in continuing. 471 472 if In_Predefined_Unit (Current_Error_Node) then 473 Error_Msg_N 474 ("construct not allowed in no run time mode!", 475 Current_Error_Node); 476 raise Unrecoverable_Error; 477 478 else 479 RTE_Error_Msg ("|construct not allowed in no run time mode"); 480 end if; 481 482 elsif Configurable_Run_Time_Mode then 483 RTE_Error_Msg ("|construct not allowed in this configuration>"); 484 else 485 RTE_Error_Msg ("run-time configuration error"); 486 end if; 487 488 -- See if this entry is to be found in the PRE_Id table that provides 489 -- specialized messages for some RE_Id values. 490 491 for J in PRE_Id_Table'Range loop 492 declare 493 TStr : constant String := PRE_Id_Table (J).Str.all; 494 RStr : constant String := RE_Id'Image (Id); 495 TMsg : String := PRE_Id_Table (J).Msg.all; 496 LMsg : Natural := TMsg'Length; 497 498 begin 499 if TStr'Length = RStr'Length then 500 for J in TStr'Range loop 501 if TStr (J) /= RStr (J) and then TStr (J) /= '?' then 502 goto Continue; 503 end if; 504 end loop; 505 506 for J in TMsg'First .. TMsg'Last - 1 loop 507 if TMsg (J) = '?' then 508 for K in 1 .. TStr'Last loop 509 if TStr (K) = '?' then 510 if RStr (K) = '0' then 511 TMsg (J) := RStr (K + 1); 512 TMsg (J + 1 .. LMsg - 1) := TMsg (J + 2 .. LMsg); 513 LMsg := LMsg - 1; 514 else 515 TMsg (J .. J + 1) := RStr (K .. K + 1); 516 end if; 517 518 exit; 519 end if; 520 end loop; 521 end if; 522 end loop; 523 524 RTE_Error_Msg (TMsg (1 .. LMsg)); 525 return; 526 end if; 527 end; 528 529 <<Continue>> null; 530 end loop; 531 532 -- We did not find an entry in the table, so output the generic entity 533 -- not found message, where the name of the entity corresponds to the 534 -- given RE_Id value. 535 536 Output_Entity_Name (Id, "not defined"); 537 end Entity_Not_Defined; 538 539 ------------------- 540 -- Get_Unit_Name -- 541 ------------------- 542 543 function Get_Unit_Name (U_Id : RTU_Id) return Unit_Name_Type is 544 Uname_Chars : constant String := RTU_Id'Image (U_Id); 545 546 begin 547 Name_Len := Uname_Chars'Length; 548 Name_Buffer (1 .. Name_Len) := Uname_Chars; 549 Set_Casing (All_Lower_Case); 550 551 if U_Id in Ada_Child then 552 Name_Buffer (4) := '.'; 553 554 if U_Id in Ada_Calendar_Child then 555 Name_Buffer (13) := '.'; 556 557 elsif U_Id in Ada_Dispatching_Child then 558 Name_Buffer (16) := '.'; 559 560 elsif U_Id in Ada_Interrupts_Child then 561 Name_Buffer (15) := '.'; 562 563 elsif U_Id in Ada_Numerics_Child then 564 Name_Buffer (13) := '.'; 565 566 elsif U_Id in Ada_Real_Time_Child then 567 Name_Buffer (14) := '.'; 568 569 elsif U_Id in Ada_Streams_Child then 570 Name_Buffer (12) := '.'; 571 572 elsif U_Id in Ada_Strings_Child then 573 Name_Buffer (12) := '.'; 574 575 elsif U_Id in Ada_Text_IO_Child then 576 Name_Buffer (12) := '.'; 577 578 elsif U_Id in Ada_Wide_Text_IO_Child then 579 Name_Buffer (17) := '.'; 580 581 elsif U_Id in Ada_Wide_Wide_Text_IO_Child then 582 Name_Buffer (22) := '.'; 583 end if; 584 585 elsif U_Id in Interfaces_Child then 586 Name_Buffer (11) := '.'; 587 588 elsif U_Id in System_Child then 589 Name_Buffer (7) := '.'; 590 591 if U_Id in System_Dim_Child then 592 Name_Buffer (11) := '.'; 593 end if; 594 595 if U_Id in System_Multiprocessors_Child then 596 Name_Buffer (23) := '.'; 597 end if; 598 599 if U_Id in System_Storage_Pools_Child then 600 Name_Buffer (21) := '.'; 601 end if; 602 603 if U_Id in System_Strings_Child then 604 Name_Buffer (15) := '.'; 605 end if; 606 607 if U_Id in System_Tasking_Child then 608 Name_Buffer (15) := '.'; 609 end if; 610 611 if U_Id in System_Tasking_Restricted_Child then 612 Name_Buffer (26) := '.'; 613 end if; 614 615 if U_Id in System_Tasking_Protected_Objects_Child then 616 Name_Buffer (33) := '.'; 617 end if; 618 619 if U_Id in System_Tasking_Async_Delays_Child then 620 Name_Buffer (28) := '.'; 621 end if; 622 end if; 623 624 -- Add %s at end for spec 625 626 Name_Buffer (Name_Len + 1) := '%'; 627 Name_Buffer (Name_Len + 2) := 's'; 628 Name_Len := Name_Len + 2; 629 630 return Name_Find; 631 end Get_Unit_Name; 632 633 ---------------- 634 -- Initialize -- 635 ---------------- 636 637 procedure Initialize is 638 begin 639 -- Initialize the unit table 640 641 for J in RTU_Id loop 642 RT_Unit_Table (J).Entity := Empty; 643 RT_Unit_Table (J).First_Implicit_With := 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 -- WARNING: This routine manages Ghost and SPARK regions. Return statements 867 -- must be replaced by gotos which jump to the end of the routine in order 868 -- to restore the Ghost and SPARK modes. 869 870 procedure Load_RTU 871 (U_Id : RTU_Id; 872 Id : RE_Id := RE_Null; 873 Use_Setting : Boolean := False) 874 is 875 U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id); 876 Priv_Par : constant Elist_Id := New_Elmt_List; 877 Lib_Unit : Node_Id; 878 879 procedure Save_Private_Visibility; 880 -- If the current unit is the body of child unit or the spec of a 881 -- private child unit, the private declarations of the parent(s) are 882 -- visible. If the unit to be loaded is another public sibling, its 883 -- compilation will affect the visibility of the common ancestors. 884 -- Indicate those that must be restored. 885 886 procedure Restore_Private_Visibility; 887 -- Restore the visibility of ancestors after compiling RTU 888 889 -------------------------------- 890 -- Restore_Private_Visibility -- 891 -------------------------------- 892 893 procedure Restore_Private_Visibility is 894 E_Par : Elmt_Id; 895 896 begin 897 E_Par := First_Elmt (Priv_Par); 898 while Present (E_Par) loop 899 if not In_Private_Part (Node (E_Par)) then 900 Install_Private_Declarations (Node (E_Par)); 901 end if; 902 903 Next_Elmt (E_Par); 904 end loop; 905 end Restore_Private_Visibility; 906 907 ----------------------------- 908 -- Save_Private_Visibility -- 909 ----------------------------- 910 911 procedure Save_Private_Visibility is 912 Par : Entity_Id; 913 914 begin 915 Par := Scope (Current_Scope); 916 while Present (Par) 917 and then Par /= Standard_Standard 918 loop 919 if Ekind (Par) = E_Package 920 and then Is_Compilation_Unit (Par) 921 and then In_Private_Part (Par) 922 then 923 Append_Elmt (Par, Priv_Par); 924 end if; 925 926 Par := Scope (Par); 927 end loop; 928 end Save_Private_Visibility; 929 930 -- Local variables 931 932 Saved_GM : constant Ghost_Mode_Type := Ghost_Mode; 933 Saved_IGR : constant Node_Id := Ignored_Ghost_Region; 934 Saved_SM : constant SPARK_Mode_Type := SPARK_Mode; 935 Saved_SMP : constant Node_Id := SPARK_Mode_Pragma; 936 -- Save Ghost and SPARK mode-related data to restore on exit 937 938 -- Start of processing for Load_RTU 939 940 begin 941 -- Nothing to do if unit is already loaded 942 943 if Present (U.Entity) then 944 return; 945 end if; 946 947 -- Provide a clean environment for the unit 948 949 Install_Ghost_Region (None, Empty); 950 Install_SPARK_Mode (None, Empty); 951 952 -- Note if secondary stack is used 953 954 if U_Id = System_Secondary_Stack then 955 Opt.Sec_Stack_Used := True; 956 end if; 957 958 -- Otherwise we need to load the unit, First build unit name 959 -- from the enumeration literal name in type RTU_Id. 960 961 U.Uname := Get_Unit_Name (U_Id); 962 U.First_Implicit_With := Empty; 963 964 -- Now do the load call, note that setting Error_Node to Empty is 965 -- a signal to Load_Unit that we will regard a failure to find the 966 -- file as a fatal error, and that it should not output any kind 967 -- of diagnostics, since we will take care of it here. 968 969 -- We save style checking switches and turn off style checking for 970 -- loading the unit, since we don't want any style checking. 971 972 declare 973 Save_Style_Check : constant Boolean := Style_Check; 974 begin 975 Style_Check := False; 976 U.Unum := 977 Load_Unit 978 (Load_Name => U.Uname, 979 Required => False, 980 Subunit => False, 981 Error_Node => Empty); 982 Style_Check := Save_Style_Check; 983 end; 984 985 -- Check for bad unit load 986 987 if U.Unum = No_Unit then 988 Load_Fail ("not found", U_Id, Id); 989 elsif Fatal_Error (U.Unum) = Error_Detected then 990 Load_Fail ("had parser errors", U_Id, Id); 991 end if; 992 993 -- Make sure that the unit is analyzed 994 995 declare 996 Was_Analyzed : constant Boolean := 997 Analyzed (Cunit (Current_Sem_Unit)); 998 999 begin 1000 -- Pretend that the current unit is analyzed, in case it is System 1001 -- or some such. This allows us to put some declarations, such as 1002 -- exceptions and packed arrays of Boolean, into System even though 1003 -- expanding them requires System... 1004 1005 -- This is a bit odd but works fine. If the RTS unit does not depend 1006 -- in any way on the current unit, then it never gets back into the 1007 -- current unit's tree, and the change we make to the current unit 1008 -- tree is never noticed by anyone (it is undone in a moment). That 1009 -- is the normal situation. 1010 1011 -- If the RTS Unit *does* depend on the current unit, for instance, 1012 -- when you are compiling System, then you had better have finished 1013 -- analyzing the part of System that is depended on before you try to 1014 -- load the RTS Unit. This means having the code in System ordered in 1015 -- an appropriate manner. 1016 1017 Set_Analyzed (Cunit (Current_Sem_Unit), True); 1018 1019 if not Analyzed (Cunit (U.Unum)) then 1020 1021 -- If the unit is already loaded through a limited_with_clause, 1022 -- the relevant entities must already be available. We do not 1023 -- want to load and analyze the unit because this would create 1024 -- a real semantic dependence when the purpose of the limited_with 1025 -- is precisely to avoid such. 1026 1027 if From_Limited_With (Cunit_Entity (U.Unum)) then 1028 null; 1029 1030 else 1031 Save_Private_Visibility; 1032 Semantics (Cunit (U.Unum)); 1033 Restore_Private_Visibility; 1034 1035 if Fatal_Error (U.Unum) = Error_Detected then 1036 Load_Fail ("had semantic errors", U_Id, Id); 1037 end if; 1038 end if; 1039 end if; 1040 1041 -- Undo the pretence 1042 1043 Set_Analyzed (Cunit (Current_Sem_Unit), Was_Analyzed); 1044 end; 1045 1046 Lib_Unit := Unit (Cunit (U.Unum)); 1047 U.Entity := Defining_Entity (Lib_Unit); 1048 1049 if Use_Setting then 1050 Set_Is_Potentially_Use_Visible (U.Entity, True); 1051 end if; 1052 1053 Restore_Ghost_Region (Saved_GM, Saved_IGR); 1054 Restore_SPARK_Mode (Saved_SM, Saved_SMP); 1055 end Load_RTU; 1056 1057 -------------------- 1058 -- Make_Unit_Name -- 1059 -------------------- 1060 1061 function Make_Unit_Name 1062 (U : RT_Unit_Table_Record; 1063 N : Node_Id) return Node_Id is 1064 1065 Nam : Node_Id; 1066 Scop : Entity_Id; 1067 1068 begin 1069 Nam := New_Occurrence_Of (U.Entity, Standard_Location); 1070 Scop := Scope (U.Entity); 1071 1072 if Nkind (N) = N_Defining_Program_Unit_Name then 1073 while Scop /= Standard_Standard loop 1074 Nam := 1075 Make_Expanded_Name (Standard_Location, 1076 Chars => Chars (U.Entity), 1077 Prefix => New_Occurrence_Of (Scop, Standard_Location), 1078 Selector_Name => Nam); 1079 Set_Entity (Nam, U.Entity); 1080 1081 Scop := Scope (Scop); 1082 end loop; 1083 end if; 1084 1085 return Nam; 1086 end Make_Unit_Name; 1087 1088 -------------------- 1089 -- Maybe_Add_With -- 1090 -------------------- 1091 1092 procedure Maybe_Add_With (U : in out RT_Unit_Table_Record) is 1093 begin 1094 -- We do not need to generate a with_clause for a call issued from 1095 -- RTE_Component_Available. However, for CodePeer, we need these 1096 -- additional with's, because for a sequence like "if RTE_Available (X) 1097 -- then ... RTE (X)" the RTE call fails to create some necessary with's. 1098 1099 if RTE_Available_Call and not Generate_SCIL then 1100 return; 1101 end if; 1102 1103 -- Avoid creating directly self-referential with clauses 1104 1105 if Current_Sem_Unit = U.Unum then 1106 return; 1107 end if; 1108 1109 -- Add the with_clause, if we have not already added an implicit with 1110 -- for this unit to the current compilation unit. 1111 1112 declare 1113 LibUnit : constant Node_Id := Unit (Cunit (U.Unum)); 1114 Clause : Node_Id; 1115 Withn : Node_Id; 1116 1117 begin 1118 Clause := U.First_Implicit_With; 1119 while Present (Clause) loop 1120 if Parent (Clause) = Cunit (Current_Sem_Unit) then 1121 return; 1122 end if; 1123 1124 Clause := Next_Implicit_With (Clause); 1125 end loop; 1126 1127 Withn := 1128 Make_With_Clause (Standard_Location, 1129 Name => 1130 Make_Unit_Name 1131 (U, Defining_Unit_Name (Specification (LibUnit)))); 1132 1133 Set_Corresponding_Spec (Withn, U.Entity); 1134 Set_First_Name (Withn); 1135 Set_Implicit_With (Withn); 1136 Set_Library_Unit (Withn, Cunit (U.Unum)); 1137 Set_Next_Implicit_With (Withn, U.First_Implicit_With); 1138 1139 U.First_Implicit_With := Withn; 1140 1141 Mark_Rewrite_Insertion (Withn); 1142 Append (Withn, Context_Items (Cunit (Current_Sem_Unit))); 1143 Check_Restriction_No_Dependence (Name (Withn), Current_Error_Node); 1144 end; 1145 end Maybe_Add_With; 1146 1147 ------------------------ 1148 -- Output_Entity_Name -- 1149 ------------------------ 1150 1151 procedure Output_Entity_Name (Id : RE_Id; Msg : String) is 1152 M : String (1 .. 2048); 1153 P : Natural := 0; 1154 -- M (1 .. P) is current message to be output 1155 1156 RE_Image : constant String := RE_Id'Image (Id); 1157 S : Natural; 1158 -- RE_Image (S .. RE_Image'Last) is the name of the entity without the 1159 -- "RE_" or "RO_XX_" prefix. 1160 1161 begin 1162 if Id = RE_Null then 1163 return; 1164 end if; 1165 1166 M (1 .. 9) := "\entity """; 1167 P := 9; 1168 1169 -- Add unit name to message, excluding %s or %b at end 1170 1171 Get_Name_String (Get_Unit_Name (RE_Unit_Table (Id))); 1172 Name_Len := Name_Len - 2; 1173 Set_Casing (Mixed_Case); 1174 M (P + 1 .. P + Name_Len) := Name_Buffer (1 .. Name_Len); 1175 P := P + Name_Len; 1176 1177 -- Add a qualifying period 1178 1179 M (P + 1) := '.'; 1180 P := P + 1; 1181 1182 -- Strip "RE" 1183 1184 if RE_Image (2) = 'E' then 1185 S := 4; 1186 1187 -- Strip "RO_XX" 1188 1189 else 1190 S := 7; 1191 end if; 1192 1193 -- Add entity name and closing quote to message 1194 1195 Name_Len := RE_Image'Length - S + 1; 1196 Name_Buffer (1 .. Name_Len) := RE_Image (S .. RE_Image'Last); 1197 Set_Casing (Mixed_Case); 1198 M (P + 1 .. P + Name_Len) := Name_Buffer (1 .. Name_Len); 1199 P := P + Name_Len; 1200 M (P + 1) := '"'; 1201 P := P + 1; 1202 1203 -- Add message 1204 1205 M (P + 1) := ' '; 1206 P := P + 1; 1207 M (P + 1 .. P + Msg'Length) := Msg; 1208 P := P + Msg'Length; 1209 1210 -- Output message at current error node location 1211 1212 RTE_Error_Msg (M (1 .. P)); 1213 end Output_Entity_Name; 1214 1215 -------------- 1216 -- RE_Chars -- 1217 -------------- 1218 1219 function RE_Chars (E : RE_Id) return Name_Id is 1220 RE_Name_Chars : constant String := RE_Id'Image (E); 1221 1222 begin 1223 -- Copy name skipping initial RE_ or RO_XX characters 1224 1225 if RE_Name_Chars (1 .. 2) = "RE" then 1226 for J in 4 .. RE_Name_Chars'Last loop 1227 Name_Buffer (J - 3) := Fold_Lower (RE_Name_Chars (J)); 1228 end loop; 1229 1230 Name_Len := RE_Name_Chars'Length - 3; 1231 1232 else 1233 for J in 7 .. RE_Name_Chars'Last loop 1234 Name_Buffer (J - 6) := Fold_Lower (RE_Name_Chars (J)); 1235 end loop; 1236 1237 Name_Len := RE_Name_Chars'Length - 6; 1238 end if; 1239 1240 return Name_Find; 1241 end RE_Chars; 1242 1243 --------- 1244 -- RTE -- 1245 --------- 1246 1247 function RTE (E : RE_Id) return Entity_Id is 1248 U_Id : constant RTU_Id := RE_Unit_Table (E); 1249 U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id); 1250 1251 Lib_Unit : Node_Id; 1252 Pkg_Ent : Entity_Id; 1253 Ename : Name_Id; 1254 1255 -- The following flag is used to disable front-end inlining when RTE 1256 -- is invoked. This prevents the analysis of other runtime bodies when 1257 -- a particular spec is loaded through Rtsfind. This is both efficient, 1258 -- and it prevents spurious visibility conflicts between use-visible 1259 -- user entities, and entities in run-time packages. 1260 1261 Save_Front_End_Inlining : Boolean; 1262 1263 procedure Check_RPC; 1264 -- Reject programs that make use of distribution features not supported 1265 -- on the current target. Also check that the PCS is compatible with the 1266 -- code generator version. On such targets (Vxworks, others?) we provide 1267 -- a minimal body for System.Rpc that only supplies an implementation of 1268 -- Partition_Id. 1269 1270 function Find_Local_Entity (E : RE_Id) return Entity_Id; 1271 -- This function is used when entity E is in this compilation's main 1272 -- unit. It gets the value from the already compiled declaration. 1273 1274 --------------- 1275 -- Check_RPC -- 1276 --------------- 1277 1278 procedure Check_RPC is 1279 begin 1280 -- Bypass this check if debug flag -gnatdR set 1281 1282 if Debug_Flag_RR then 1283 return; 1284 end if; 1285 1286 -- Otherwise we need the check if we are going after one of the 1287 -- critical entities in System.RPC / System.Partition_Interface. 1288 1289 if E = RE_Do_Rpc 1290 or else 1291 E = RE_Do_Apc 1292 or else 1293 E = RE_Params_Stream_Type 1294 or else 1295 E = RE_Request_Access 1296 then 1297 -- If generating RCI stubs, check that we have a real PCS 1298 1299 if (Distribution_Stub_Mode = Generate_Receiver_Stub_Body 1300 or else 1301 Distribution_Stub_Mode = Generate_Caller_Stub_Body) 1302 and then Get_PCS_Name = Name_No_DSA 1303 then 1304 Set_Standard_Error; 1305 Write_Str ("distribution feature not supported"); 1306 Write_Eol; 1307 raise Unrecoverable_Error; 1308 1309 -- In all cases, check Exp_Dist and System.Partition_Interface 1310 -- consistency. 1311 1312 elsif Get_PCS_Version /= 1313 Exp_Dist.PCS_Version_Number (Get_PCS_Name) 1314 then 1315 Set_Standard_Error; 1316 Write_Str ("PCS version mismatch: expander "); 1317 Write_Int (Exp_Dist.PCS_Version_Number (Get_PCS_Name)); 1318 Write_Str (", PCS ("); 1319 Write_Name (Get_PCS_Name); 1320 Write_Str (") "); 1321 Write_Int (Get_PCS_Version); 1322 Write_Eol; 1323 raise Unrecoverable_Error; 1324 end if; 1325 end if; 1326 end Check_RPC; 1327 1328 ----------------------- 1329 -- Find_Local_Entity -- 1330 ----------------------- 1331 1332 function Find_Local_Entity (E : RE_Id) return Entity_Id is 1333 RE_Str : constant String := RE_Id'Image (E); 1334 Nam : Name_Id; 1335 Ent : Entity_Id; 1336 1337 Save_Nam : constant String := Name_Buffer (1 .. Name_Len); 1338 -- Save name buffer and length over call 1339 1340 begin 1341 Name_Len := Natural'Max (0, RE_Str'Length - 3); 1342 Name_Buffer (1 .. Name_Len) := 1343 RE_Str (RE_Str'First + 3 .. RE_Str'Last); 1344 1345 Nam := Name_Find; 1346 Ent := Entity_Id (Get_Name_Table_Int (Nam)); 1347 1348 Name_Len := Save_Nam'Length; 1349 Name_Buffer (1 .. Name_Len) := Save_Nam; 1350 1351 return Ent; 1352 end Find_Local_Entity; 1353 1354 -- Start of processing for RTE 1355 1356 begin 1357 -- Doing a rtsfind in system.ads is special, as we cannot do this 1358 -- when compiling System itself. So if we are compiling system then 1359 -- we should already have acquired and processed the declaration 1360 -- of the entity. The test is to see if this compilation's main unit 1361 -- is System. If so, return the value from the already compiled 1362 -- declaration and otherwise do a regular find. 1363 1364 -- Not pleasant, but these kinds of annoying recursion scenarios when 1365 -- writing an Ada compiler in Ada have to be broken somewhere. 1366 1367 if Present (Main_Unit_Entity) 1368 and then Chars (Main_Unit_Entity) = Name_System 1369 and then Analyzed (Main_Unit_Entity) 1370 and then not Is_Child_Unit (Main_Unit_Entity) 1371 then 1372 return Check_CRT (E, Find_Local_Entity (E)); 1373 end if; 1374 1375 Save_Front_End_Inlining := Front_End_Inlining; 1376 Front_End_Inlining := False; 1377 1378 -- Load unit if unit not previously loaded 1379 1380 if No (RE_Table (E)) then 1381 Load_RTU (U_Id, Id => E); 1382 Lib_Unit := Unit (Cunit (U.Unum)); 1383 1384 -- In the subprogram case, we are all done, the entity we want 1385 -- is the entity for the subprogram itself. Note that we do not 1386 -- bother to check that it is the entity that was requested. 1387 -- the only way that could fail to be the case is if runtime is 1388 -- hopelessly misconfigured, and it isn't worth testing for this. 1389 1390 if Nkind (Lib_Unit) = N_Subprogram_Declaration then 1391 RE_Table (E) := U.Entity; 1392 1393 -- Otherwise we must have the package case. First check package 1394 -- entity itself (e.g. RTE_Name for System.Interrupts.Name) 1395 1396 else 1397 pragma Assert (Nkind (Lib_Unit) = N_Package_Declaration); 1398 Ename := RE_Chars (E); 1399 1400 -- First we search the package entity chain. If the package 1401 -- only has a limited view, scan the corresponding list of 1402 -- incomplete types. 1403 1404 if From_Limited_With (U.Entity) then 1405 Pkg_Ent := First_Entity (Limited_View (U.Entity)); 1406 else 1407 Pkg_Ent := First_Entity (U.Entity); 1408 end if; 1409 1410 while Present (Pkg_Ent) loop 1411 if Ename = Chars (Pkg_Ent) then 1412 RE_Table (E) := Pkg_Ent; 1413 Check_RPC; 1414 goto Found; 1415 end if; 1416 1417 Next_Entity (Pkg_Ent); 1418 end loop; 1419 1420 -- If we did not find the entity in the package entity chain, 1421 -- then check if the package entity itself matches. Note that 1422 -- we do this check after searching the entity chain, since 1423 -- the rule is that in case of ambiguity, we prefer the entity 1424 -- defined within the package, rather than the package itself. 1425 1426 if Ename = Chars (U.Entity) then 1427 RE_Table (E) := U.Entity; 1428 end if; 1429 1430 -- If we didn't find the entity we want, something is wrong. 1431 -- We just leave RE_Table (E) set to Empty and the appropriate 1432 -- action will be taken by Check_CRT when we exit. 1433 1434 end if; 1435 end if; 1436 1437 <<Found>> 1438 Maybe_Add_With (U); 1439 1440 Front_End_Inlining := Save_Front_End_Inlining; 1441 return Check_CRT (E, RE_Table (E)); 1442 end RTE; 1443 1444 ------------------- 1445 -- RTE_Available -- 1446 ------------------- 1447 1448 function RTE_Available (E : RE_Id) return Boolean is 1449 Dummy : Entity_Id; 1450 pragma Warnings (Off, Dummy); 1451 1452 Result : Boolean; 1453 1454 Save_RTE_Available_Call : constant Boolean := RTE_Available_Call; 1455 Save_RTE_Is_Available : constant Boolean := RTE_Is_Available; 1456 -- These are saved recursively because the call to load a unit 1457 -- caused by an upper level call may perform a recursive call 1458 -- to this routine during analysis of the corresponding unit. 1459 1460 begin 1461 RTE_Available_Call := True; 1462 RTE_Is_Available := True; 1463 Dummy := RTE (E); 1464 Result := RTE_Is_Available; 1465 RTE_Available_Call := Save_RTE_Available_Call; 1466 RTE_Is_Available := Save_RTE_Is_Available; 1467 return Result; 1468 1469 exception 1470 when RE_Not_Available => 1471 RTE_Available_Call := Save_RTE_Available_Call; 1472 RTE_Is_Available := Save_RTE_Is_Available; 1473 return False; 1474 end RTE_Available; 1475 1476 -------------------------- 1477 -- RTE_Record_Component -- 1478 -------------------------- 1479 1480 function RTE_Record_Component (E : RE_Id) return Entity_Id is 1481 U_Id : constant RTU_Id := RE_Unit_Table (E); 1482 U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id); 1483 E1 : Entity_Id; 1484 Ename : Name_Id; 1485 Found_E : Entity_Id; 1486 Lib_Unit : Node_Id; 1487 Pkg_Ent : Entity_Id; 1488 1489 -- The following flag is used to disable front-end inlining when 1490 -- RTE_Record_Component is invoked. This prevents the analysis of other 1491 -- runtime bodies when a particular spec is loaded through Rtsfind. This 1492 -- is both efficient, and it prevents spurious visibility conflicts 1493 -- between use-visible user entities, and entities in run-time packages. 1494 1495 Save_Front_End_Inlining : Boolean; 1496 1497 begin 1498 -- Note: Contrary to subprogram RTE, there is no need to do any special 1499 -- management with package system.ads because it has no record type 1500 -- declarations. 1501 1502 Save_Front_End_Inlining := Front_End_Inlining; 1503 Front_End_Inlining := False; 1504 1505 -- Load unit if unit not previously loaded 1506 1507 if not Present (U.Entity) then 1508 Load_RTU (U_Id, Id => E); 1509 end if; 1510 1511 Lib_Unit := Unit (Cunit (U.Unum)); 1512 1513 pragma Assert (Nkind (Lib_Unit) = N_Package_Declaration); 1514 Ename := RE_Chars (E); 1515 1516 -- Search the entity in the components of record type declarations 1517 -- found in the package entity chain. 1518 1519 Found_E := Empty; 1520 Pkg_Ent := First_Entity (U.Entity); 1521 Search : while Present (Pkg_Ent) loop 1522 if Is_Record_Type (Pkg_Ent) then 1523 E1 := First_Entity (Pkg_Ent); 1524 while Present (E1) loop 1525 if Ename = Chars (E1) then 1526 pragma Assert (not Present (Found_E)); 1527 Found_E := E1; 1528 end if; 1529 1530 Next_Entity (E1); 1531 end loop; 1532 end if; 1533 1534 Next_Entity (Pkg_Ent); 1535 end loop Search; 1536 1537 -- If we didn't find the entity we want, something is wrong. The 1538 -- appropriate action will be taken by Check_CRT when we exit. 1539 1540 Maybe_Add_With (U); 1541 1542 Front_End_Inlining := Save_Front_End_Inlining; 1543 return Check_CRT (E, Found_E); 1544 end RTE_Record_Component; 1545 1546 ------------------------------------ 1547 -- RTE_Record_Component_Available -- 1548 ------------------------------------ 1549 1550 function RTE_Record_Component_Available (E : RE_Id) return Boolean is 1551 Dummy : Entity_Id; 1552 pragma Warnings (Off, Dummy); 1553 1554 Result : Boolean; 1555 1556 Save_RTE_Available_Call : constant Boolean := RTE_Available_Call; 1557 Save_RTE_Is_Available : constant Boolean := RTE_Is_Available; 1558 -- These are saved recursively because the call to load a unit 1559 -- caused by an upper level call may perform a recursive call 1560 -- to this routine during analysis of the corresponding unit. 1561 1562 begin 1563 RTE_Available_Call := True; 1564 RTE_Is_Available := True; 1565 Dummy := RTE_Record_Component (E); 1566 Result := RTE_Is_Available; 1567 RTE_Available_Call := Save_RTE_Available_Call; 1568 RTE_Is_Available := Save_RTE_Is_Available; 1569 return Result; 1570 1571 exception 1572 when RE_Not_Available => 1573 RTE_Available_Call := Save_RTE_Available_Call; 1574 RTE_Is_Available := Save_RTE_Is_Available; 1575 return False; 1576 end RTE_Record_Component_Available; 1577 1578 ------------------- 1579 -- RTE_Error_Msg -- 1580 ------------------- 1581 1582 procedure RTE_Error_Msg (Msg : String) is 1583 begin 1584 if RTE_Available_Call then 1585 RTE_Is_Available := False; 1586 else 1587 Error_Msg_N (Msg, Current_Error_Node); 1588 1589 -- Bump count of violations if we are in configurable run-time 1590 -- mode and this is not a continuation message. 1591 1592 if Configurable_Run_Time_Mode and then Msg (Msg'First) /= '\' then 1593 Configurable_Run_Time_Violations := 1594 Configurable_Run_Time_Violations + 1; 1595 end if; 1596 end if; 1597 end RTE_Error_Msg; 1598 1599 ---------------- 1600 -- RTU_Entity -- 1601 ---------------- 1602 1603 function RTU_Entity (U : RTU_Id) return Entity_Id is 1604 begin 1605 return RT_Unit_Table (U).Entity; 1606 end RTU_Entity; 1607 1608 ---------------- 1609 -- RTU_Loaded -- 1610 ---------------- 1611 1612 function RTU_Loaded (U : RTU_Id) return Boolean is 1613 begin 1614 return Present (RT_Unit_Table (U).Entity); 1615 end RTU_Loaded; 1616 1617 -------------------- 1618 -- Set_RTU_Loaded -- 1619 -------------------- 1620 1621 procedure Set_RTU_Loaded (N : Node_Id) is 1622 Loc : constant Source_Ptr := Sloc (N); 1623 Unum : constant Unit_Number_Type := Get_Source_Unit (Loc); 1624 Uname : constant Unit_Name_Type := Unit_Name (Unum); 1625 E : constant Entity_Id := 1626 Defining_Entity (Unit (Cunit (Unum))); 1627 begin 1628 pragma Assert (Is_Predefined_Unit (Unum)); 1629 1630 -- Loop through entries in RTU table looking for matching entry 1631 1632 for U_Id in RTU_Id'Range loop 1633 1634 -- Here we have a match 1635 1636 if Get_Unit_Name (U_Id) = Uname then 1637 declare 1638 U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id); 1639 -- The RT_Unit_Table entry that may need updating 1640 1641 begin 1642 -- If entry is not set, set it now, and indicate that it was 1643 -- loaded through an explicit context clause. 1644 1645 if No (U.Entity) then 1646 U := (Entity => E, 1647 Uname => Get_Unit_Name (U_Id), 1648 Unum => Unum, 1649 First_Implicit_With => Empty); 1650 end if; 1651 1652 return; 1653 end; 1654 end if; 1655 end loop; 1656 end Set_RTU_Loaded; 1657 1658 ------------------------- 1659 -- SPARK_Implicit_Load -- 1660 ------------------------- 1661 1662 procedure SPARK_Implicit_Load (E : RE_Id) is 1663 Unused : Entity_Id; 1664 1665 begin 1666 pragma Assert (GNATprove_Mode); 1667 1668 -- Force loading of a predefined unit 1669 1670 Unused := RTE (E); 1671 end SPARK_Implicit_Load; 1672 1673end Rtsfind; 1674