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) 1992-2020, Free Software Foundation, Inc. -- 10-- -- 11-- GNAT is free software; you can redistribute it and/or modify it under -- 12-- terms of the GNU General Public License as published by the Free Soft- -- 13-- ware Foundation; either version 3, or (at your option) any later ver- -- 14-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 15-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 16-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- 17-- for more details. You should have received a copy of the GNU General -- 18-- Public License distributed with GNAT; see file COPYING3. If not, go to -- 19-- http://www.gnu.org/licenses for a complete copy of the license. -- 20-- -- 21-- GNAT was originally developed by the GNAT team at New York University. -- 22-- Extensive contributions were provided by Ada Core Technologies Inc. -- 23-- -- 24------------------------------------------------------------------------------ 25 26with Atree; use Atree; 27with 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 Present (Parent_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 -- The following subtypes include all the proper descendants of each unit 544 -- that has such descendants. For example, Ada_Calendar_Descendant includes 545 -- all the descendents of Ada.Calendar (except Ada.Calendar itself). These 546 -- are used by Get_Unit_Name to know where to change "_" to ".", and by 547 -- Is_Text_IO_Special_Package to detect the special generic pseudo-children 548 -- of [[Wide_]Wide_]Text_IO. 549 550 subtype Ada_Descendant is RTU_Id 551 range Ada_Calendar .. Ada_Wide_Wide_Text_IO_Modular_IO; 552 553 subtype Ada_Calendar_Descendant is Ada_Descendant 554 range Ada_Calendar_Delays .. Ada_Calendar_Delays; 555 556 subtype Ada_Dispatching_Descendant is Ada_Descendant 557 range Ada_Dispatching_EDF .. Ada_Dispatching_EDF; 558 559 subtype Ada_Interrupts_Descendant is Ada_Descendant range 560 Ada_Interrupts_Names .. Ada_Interrupts_Names; 561 562 subtype Ada_Numerics_Descendant is Ada_Descendant 563 range Ada_Numerics_Generic_Elementary_Functions .. 564 Ada_Numerics_Generic_Elementary_Functions; 565 566 subtype Ada_Real_Time_Descendant is Ada_Descendant 567 range Ada_Real_Time_Delays .. Ada_Real_Time_Timing_Events; 568 569 subtype Ada_Streams_Descendant is Ada_Descendant 570 range Ada_Streams_Stream_IO .. Ada_Streams_Stream_IO; 571 572 subtype Ada_Strings_Descendant is Ada_Descendant 573 range Ada_Strings_Superbounded .. Ada_Strings_Text_Output_Buffers; 574 575 subtype Ada_Strings_Text_Output_Descendant is Ada_Strings_Descendant 576 range Ada_Strings_Text_Output_Utils .. Ada_Strings_Text_Output_Buffers; 577 578 subtype Ada_Text_IO_Descendant is Ada_Descendant 579 range Ada_Text_IO_Decimal_IO .. Ada_Text_IO_Modular_IO; 580 581 subtype Ada_Wide_Text_IO_Descendant is Ada_Descendant 582 range Ada_Wide_Text_IO_Decimal_IO .. Ada_Wide_Text_IO_Modular_IO; 583 584 subtype Ada_Wide_Wide_Text_IO_Descendant is Ada_Descendant 585 range Ada_Wide_Wide_Text_IO_Decimal_IO .. 586 Ada_Wide_Wide_Text_IO_Modular_IO; 587 588 subtype CUDA_Descendant is RTU_Id 589 range CUDA_Driver_Types .. CUDA_Vector_Types; 590 591 subtype Interfaces_Descendant is RTU_Id 592 range Interfaces_C .. Interfaces_C_Strings; 593 594 subtype Interfaces_C_Descendant is Interfaces_Descendant 595 range Interfaces_C_Strings .. Interfaces_C_Strings; 596 597 subtype System_Descendant is RTU_Id 598 range System_Address_Image .. System_Tasking_Stages; 599 600 subtype System_Dim_Descendant is System_Descendant 601 range System_Dim_Float_IO .. System_Dim_Integer_IO; 602 603 subtype System_Multiprocessors_Descendant is System_Descendant 604 range System_Multiprocessors_Dispatching_Domains .. 605 System_Multiprocessors_Dispatching_Domains; 606 607 subtype System_Storage_Pools_Descendant is System_Descendant 608 range System_Storage_Pools_Subpools .. System_Storage_Pools_Subpools; 609 610 subtype System_Strings_Descendant is System_Descendant 611 range System_Strings_Stream_Ops .. System_Strings_Stream_Ops; 612 613 subtype System_Tasking_Descendant is System_Descendant 614 range System_Tasking_Async_Delays .. System_Tasking_Stages; 615 616 subtype System_Tasking_Protected_Objects_Descendant is 617 System_Tasking_Descendant 618 range System_Tasking_Protected_Objects_Entries .. 619 System_Tasking_Protected_Objects_Single_Entry; 620 621 subtype System_Tasking_Restricted_Descendant is System_Tasking_Descendant 622 range System_Tasking_Restricted_Stages .. 623 System_Tasking_Restricted_Stages; 624 625 subtype System_Tasking_Async_Delays_Descendant is System_Tasking_Descendant 626 range System_Tasking_Async_Delays_Enqueue_Calendar .. 627 System_Tasking_Async_Delays_Enqueue_RT; 628 629 function Get_Unit_Name (U_Id : RTU_Id) return Unit_Name_Type is 630 Uname_Chars : constant String := RTU_Id'Image (U_Id); 631 begin 632 Name_Len := Uname_Chars'Length; 633 Name_Buffer (1 .. Name_Len) := Uname_Chars; 634 Set_Casing (All_Lower_Case); 635 636 if U_Id in Ada_Descendant then 637 Name_Buffer (4) := '.'; 638 639 if U_Id in Ada_Calendar_Descendant then 640 Name_Buffer (13) := '.'; 641 642 elsif U_Id in Ada_Dispatching_Descendant then 643 Name_Buffer (16) := '.'; 644 645 elsif U_Id in Ada_Interrupts_Descendant then 646 Name_Buffer (15) := '.'; 647 648 elsif U_Id in Ada_Numerics_Descendant then 649 Name_Buffer (13) := '.'; 650 651 elsif U_Id in Ada_Real_Time_Descendant then 652 Name_Buffer (14) := '.'; 653 654 elsif U_Id in Ada_Streams_Descendant then 655 Name_Buffer (12) := '.'; 656 657 elsif U_Id in Ada_Strings_Descendant then 658 Name_Buffer (12) := '.'; 659 660 if U_Id in Ada_Strings_Text_Output_Descendant then 661 Name_Buffer (24) := '.'; 662 end if; 663 664 elsif U_Id in Ada_Text_IO_Descendant then 665 Name_Buffer (12) := '.'; 666 667 elsif U_Id in Ada_Wide_Text_IO_Descendant then 668 Name_Buffer (17) := '.'; 669 670 elsif U_Id in Ada_Wide_Wide_Text_IO_Descendant then 671 Name_Buffer (22) := '.'; 672 end if; 673 674 elsif U_Id in CUDA_Descendant then 675 Name_Buffer (5) := '.'; 676 677 elsif U_Id in Interfaces_Descendant then 678 Name_Buffer (11) := '.'; 679 680 if U_Id in Interfaces_C_Descendant then 681 Name_Buffer (13) := '.'; 682 end if; 683 684 elsif U_Id in System_Descendant then 685 Name_Buffer (7) := '.'; 686 687 if U_Id in System_Dim_Descendant then 688 Name_Buffer (11) := '.'; 689 end if; 690 691 if U_Id in System_Multiprocessors_Descendant then 692 Name_Buffer (23) := '.'; 693 end if; 694 695 if U_Id in System_Storage_Pools_Descendant then 696 Name_Buffer (21) := '.'; 697 end if; 698 699 if U_Id in System_Strings_Descendant then 700 Name_Buffer (15) := '.'; 701 end if; 702 703 if U_Id in System_Tasking_Descendant then 704 Name_Buffer (15) := '.'; 705 end if; 706 707 if U_Id in System_Tasking_Restricted_Descendant then 708 Name_Buffer (26) := '.'; 709 end if; 710 711 if U_Id in System_Tasking_Protected_Objects_Descendant then 712 Name_Buffer (33) := '.'; 713 end if; 714 715 if U_Id in System_Tasking_Async_Delays_Descendant then 716 Name_Buffer (28) := '.'; 717 end if; 718 end if; 719 720 -- Add %s at end for spec 721 722 Name_Buffer (Name_Len + 1) := '%'; 723 Name_Buffer (Name_Len + 2) := 's'; 724 Name_Len := Name_Len + 2; 725 726 return Name_Find; 727 end Get_Unit_Name; 728 729 ---------------- 730 -- Initialize -- 731 ---------------- 732 733 procedure Initialize is 734 begin 735 -- Initialize the unit table 736 737 for J in RTU_Id loop 738 RT_Unit_Table (J).Entity := Empty; 739 RT_Unit_Table (J).First_Implicit_With := Empty; 740 end loop; 741 742 for J in RE_Id loop 743 RE_Table (J) := Empty; 744 end loop; 745 746 RTE_Is_Available := False; 747 end Initialize; 748 749 ------------ 750 -- Is_RTE -- 751 ------------ 752 753 function Is_RTE (Ent : Entity_Id; E : RE_Id) return Boolean is 754 E_Unit_Name : Unit_Name_Type; 755 Ent_Unit_Name : Unit_Name_Type; 756 757 S : Entity_Id; 758 E1 : Entity_Id; 759 E2 : Entity_Id; 760 761 begin 762 if No (Ent) then 763 return False; 764 765 -- If E has already a corresponding entity, check it directly, 766 -- going to full views if they exist to deal with the incomplete 767 -- and private type cases properly. 768 769 elsif Present (RE_Table (E)) then 770 E1 := Ent; 771 772 if Is_Type (E1) and then Present (Full_View (E1)) then 773 E1 := Full_View (E1); 774 end if; 775 776 E2 := RE_Table (E); 777 778 if Is_Type (E2) and then Present (Full_View (E2)) then 779 E2 := Full_View (E2); 780 end if; 781 782 return E1 = E2; 783 end if; 784 785 -- If the unit containing E is not loaded, we already know that the 786 -- entity we have cannot have come from this unit. 787 788 E_Unit_Name := Get_Unit_Name (RE_Unit_Table (E)); 789 790 if not Is_Loaded (E_Unit_Name) then 791 return False; 792 end if; 793 794 -- Here the unit containing the entity is loaded. We have not made 795 -- an explicit call to RTE to get the entity in question, but we may 796 -- have obtained a reference to it indirectly from some other entity 797 -- in the same unit, or some other unit that references it. 798 799 -- Get the defining unit of the entity 800 801 S := Scope (Ent); 802 803 if No (S) or else Ekind (S) /= E_Package then 804 return False; 805 end if; 806 807 Ent_Unit_Name := Get_Unit_Name (Unit_Declaration_Node (S)); 808 809 -- If the defining unit of the entity we are testing is not the 810 -- unit containing E, then they cannot possibly match. 811 812 if Ent_Unit_Name /= E_Unit_Name then 813 return False; 814 end if; 815 816 -- If the units match, then compare the names (remember that no 817 -- overloading is permitted in entities fetched using Rtsfind). 818 819 if RE_Chars (E) = Chars (Ent) then 820 RE_Table (E) := Ent; 821 822 -- If front-end inlining is enabled, we may be within a body that 823 -- contains inlined functions, which has not been retrieved through 824 -- rtsfind, and therefore is not yet recorded in the RT_Unit_Table. 825 -- Add the unit information now, it must be fully available. 826 827 declare 828 U : RT_Unit_Table_Record 829 renames RT_Unit_Table (RE_Unit_Table (E)); 830 begin 831 if No (U.Entity) then 832 U.Entity := S; 833 U.Uname := E_Unit_Name; 834 U.Unum := Get_Source_Unit (S); 835 end if; 836 end; 837 838 return True; 839 else 840 return False; 841 end if; 842 end Is_RTE; 843 844 ------------ 845 -- Is_RTU -- 846 ------------ 847 848 function Is_RTU (Ent : Entity_Id; U : RTU_Id) return Boolean is 849 E : constant Entity_Id := RT_Unit_Table (U).Entity; 850 begin 851 return Present (E) and then E = Ent; 852 end Is_RTU; 853 854 -------------------------------- 855 -- Is_Text_IO_Special_Package -- 856 -------------------------------- 857 858 function Is_Text_IO_Special_Package (E : Entity_Id) return Boolean is 859 begin 860 pragma Assert (Is_Package_Or_Generic_Package (E)); 861 862 -- ??? detection with a scope climbing might be more efficient 863 864 for U in Ada_Text_IO_Descendant loop 865 if Is_RTU (E, U) then 866 return True; 867 end if; 868 end loop; 869 870 for U in Ada_Wide_Text_IO_Descendant loop 871 if Is_RTU (E, U) then 872 return True; 873 end if; 874 end loop; 875 876 for U in Ada_Wide_Wide_Text_IO_Descendant loop 877 if Is_RTU (E, U) then 878 return True; 879 end if; 880 end loop; 881 882 return False; 883 end Is_Text_IO_Special_Package; 884 885 ----------------------------- 886 -- Is_Text_IO_Special_Unit -- 887 ----------------------------- 888 889 function Is_Text_IO_Special_Unit (Nam : Node_Id) return Boolean is 890 Prf : Node_Id; 891 Sel : Node_Id; 892 893 begin 894 if Nkind (Nam) /= N_Expanded_Name then 895 return False; 896 end if; 897 898 Prf := Prefix (Nam); 899 Sel := Selector_Name (Nam); 900 901 if Nkind (Sel) /= N_Expanded_Name 902 or else Nkind (Prf) /= N_Identifier 903 or else Chars (Prf) /= Name_Ada 904 then 905 return False; 906 end if; 907 908 Prf := Prefix (Sel); 909 Sel := Selector_Name (Sel); 910 911 return 912 Nkind (Prf) = N_Identifier 913 and then 914 Chars (Prf) in Name_Text_IO 915 | Name_Wide_Text_IO 916 | Name_Wide_Wide_Text_IO 917 and then Nkind (Sel) = N_Identifier 918 and then Chars (Sel) in Text_IO_Package_Name; 919 end Is_Text_IO_Special_Unit; 920 921 --------------- 922 -- Load_Fail -- 923 --------------- 924 925 procedure Load_Fail (S : String; U_Id : RTU_Id; Id : RE_Id) is 926 M : String (1 .. 100); 927 P : Natural := 0; 928 929 begin 930 -- Output header message 931 932 if Configurable_Run_Time_Mode then 933 RTE_Error_Msg ("construct not allowed in configurable run-time mode"); 934 else 935 RTE_Error_Msg ("run-time library configuration error"); 936 end if; 937 938 -- Output file name and reason string 939 940 M (1 .. 6) := "\file "; 941 P := 6; 942 943 Get_Name_String 944 (Get_File_Name (RT_Unit_Table (U_Id).Uname, Subunit => False)); 945 M (P + 1 .. P + Name_Len) := Name_Buffer (1 .. Name_Len); 946 P := P + Name_Len; 947 948 M (P + 1) := ' '; 949 P := P + 1; 950 951 M (P + 1 .. P + S'Length) := S; 952 P := P + S'Length; 953 954 RTE_Error_Msg (M (1 .. P)); 955 956 -- Output entity name 957 958 Output_Entity_Name (Id, "not available"); 959 960 -- In configurable run time mode, we raise RE_Not_Available, and the 961 -- caller is expected to deal gracefully with this. In the case of a 962 -- call to RTE_Available, this exception will be caught in Rtsfind, 963 -- and result in a returned value of False for the call. 964 965 if Configurable_Run_Time_Mode then 966 raise RE_Not_Available; 967 968 -- Here we have a load failure in normal full run time mode. See if we 969 -- are in the context of an RTE_Available call. If so, we just raise 970 -- RE_Not_Available. This can happen if a unit is unavailable, which 971 -- happens for example in the VM case, where the run-time is not 972 -- complete, but we do not regard it as a configurable run-time. 973 -- If the caller has done an explicit call to RTE_Available, then 974 -- clearly the caller is prepared to deal with a result of False. 975 976 elsif RTE_Available_Call then 977 RTE_Is_Available := False; 978 raise RE_Not_Available; 979 980 -- If we are not in the context of an RTE_Available call, we are really 981 -- trying to load an entity that is not there, and that should never 982 -- happen, so in this case we signal a fatal error. 983 984 else 985 raise Unrecoverable_Error; 986 end if; 987 end Load_Fail; 988 989 -------------- 990 -- Load_RTU -- 991 -------------- 992 993 -- WARNING: This routine manages Ghost and SPARK regions. Return statements 994 -- must be replaced by gotos which jump to the end of the routine in order 995 -- to restore the Ghost and SPARK modes. 996 997 procedure Load_RTU 998 (U_Id : RTU_Id; 999 Id : RE_Id := RE_Null; 1000 Use_Setting : Boolean := False) 1001 is 1002 U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id); 1003 Priv_Par : constant Elist_Id := New_Elmt_List; 1004 Lib_Unit : Node_Id; 1005 1006 procedure Save_Private_Visibility; 1007 -- If the current unit is the body of child unit or the spec of a 1008 -- private child unit, the private declarations of the parent(s) are 1009 -- visible. If the unit to be loaded is another public sibling, its 1010 -- compilation will affect the visibility of the common ancestors. 1011 -- Indicate those that must be restored. 1012 1013 procedure Restore_Private_Visibility; 1014 -- Restore the visibility of ancestors after compiling RTU 1015 1016 -------------------------------- 1017 -- Restore_Private_Visibility -- 1018 -------------------------------- 1019 1020 procedure Restore_Private_Visibility is 1021 E_Par : Elmt_Id; 1022 1023 begin 1024 E_Par := First_Elmt (Priv_Par); 1025 while Present (E_Par) loop 1026 if not In_Private_Part (Node (E_Par)) then 1027 Install_Private_Declarations (Node (E_Par)); 1028 end if; 1029 1030 Next_Elmt (E_Par); 1031 end loop; 1032 end Restore_Private_Visibility; 1033 1034 ----------------------------- 1035 -- Save_Private_Visibility -- 1036 ----------------------------- 1037 1038 procedure Save_Private_Visibility is 1039 Par : Entity_Id; 1040 1041 begin 1042 Par := Scope (Current_Scope); 1043 while Present (Par) 1044 and then Par /= Standard_Standard 1045 loop 1046 if Ekind (Par) = E_Package 1047 and then Is_Compilation_Unit (Par) 1048 and then In_Private_Part (Par) 1049 then 1050 Append_Elmt (Par, Priv_Par); 1051 end if; 1052 1053 Par := Scope (Par); 1054 end loop; 1055 end Save_Private_Visibility; 1056 1057 -- Local variables 1058 1059 Saved_GM : constant Ghost_Mode_Type := Ghost_Mode; 1060 Saved_IGR : constant Node_Id := Ignored_Ghost_Region; 1061 Saved_ISMP : constant Boolean := 1062 Ignore_SPARK_Mode_Pragmas_In_Instance; 1063 Saved_SM : constant SPARK_Mode_Type := SPARK_Mode; 1064 Saved_SMP : constant Node_Id := SPARK_Mode_Pragma; 1065 -- Save Ghost and SPARK mode-related data to restore on exit 1066 1067 -- Start of processing for Load_RTU 1068 1069 begin 1070 -- Nothing to do if unit is already loaded 1071 1072 if Present (U.Entity) then 1073 return; 1074 end if; 1075 1076 -- Provide a clean environment for the unit 1077 1078 Ignore_SPARK_Mode_Pragmas_In_Instance := False; 1079 Install_Ghost_Region (None, Empty); 1080 Install_SPARK_Mode (None, Empty); 1081 1082 -- Otherwise we need to load the unit, First build unit name from the 1083 -- enumeration literal name in type RTU_Id. 1084 1085 U.Uname := Get_Unit_Name (U_Id); 1086 U.First_Implicit_With := Empty; 1087 1088 -- Now do the load call, note that setting Error_Node to Empty is a 1089 -- signal to Load_Unit that we will regard a failure to find the file as 1090 -- a fatal error, and that it should not output any kind of diagnostics, 1091 -- since we will take care of it here. 1092 1093 -- We save style checking switches and turn off style checking for 1094 -- loading the unit, since we don't want any style checking. 1095 1096 declare 1097 Save_Style_Check : constant Boolean := Style_Check; 1098 begin 1099 Style_Check := False; 1100 U.Unum := 1101 Load_Unit 1102 (Load_Name => U.Uname, 1103 Required => False, 1104 Subunit => False, 1105 Error_Node => Empty); 1106 Style_Check := Save_Style_Check; 1107 end; 1108 1109 -- Check for bad unit load 1110 1111 if U.Unum = No_Unit then 1112 Load_Fail ("not found", U_Id, Id); 1113 elsif Fatal_Error (U.Unum) = Error_Detected then 1114 Load_Fail ("had parser errors", U_Id, Id); 1115 end if; 1116 1117 -- Make sure that the unit is analyzed 1118 1119 declare 1120 Was_Analyzed : constant Boolean := 1121 Analyzed (Cunit (Current_Sem_Unit)); 1122 1123 begin 1124 -- Pretend that the current unit is analyzed, in case it is System 1125 -- or some such. This allows us to put some declarations, such as 1126 -- exceptions and packed arrays of Boolean, into System even though 1127 -- expanding them requires System... 1128 1129 -- This is a bit odd but works fine. If the RTS unit does not depend 1130 -- in any way on the current unit, then it never gets back into the 1131 -- current unit's tree, and the change we make to the current unit 1132 -- tree is never noticed by anyone (it is undone in a moment). That 1133 -- is the normal situation. 1134 1135 -- If the RTS Unit *does* depend on the current unit, for instance, 1136 -- when you are compiling System, then you had better have finished 1137 -- analyzing the part of System that is depended on before you try to 1138 -- load the RTS Unit. This means having the code in System ordered in 1139 -- an appropriate manner. 1140 1141 Set_Analyzed (Cunit (Current_Sem_Unit), True); 1142 1143 if not Analyzed (Cunit (U.Unum)) then 1144 1145 -- If the unit is already loaded through a limited_with_clause, 1146 -- the relevant entities must already be available. We do not 1147 -- want to load and analyze the unit because this would create 1148 -- a real semantic dependence when the purpose of the limited_with 1149 -- is precisely to avoid such. 1150 1151 if From_Limited_With (Cunit_Entity (U.Unum)) then 1152 null; 1153 1154 else 1155 Save_Private_Visibility; 1156 Semantics (Cunit (U.Unum)); 1157 Restore_Private_Visibility; 1158 1159 if Fatal_Error (U.Unum) = Error_Detected then 1160 Load_Fail ("had semantic errors", U_Id, Id); 1161 end if; 1162 end if; 1163 end if; 1164 1165 -- Undo the pretence 1166 1167 Set_Analyzed (Cunit (Current_Sem_Unit), Was_Analyzed); 1168 end; 1169 1170 Lib_Unit := Unit (Cunit (U.Unum)); 1171 U.Entity := Defining_Entity (Lib_Unit); 1172 1173 if Use_Setting then 1174 Set_Is_Potentially_Use_Visible (U.Entity, True); 1175 end if; 1176 1177 Ignore_SPARK_Mode_Pragmas_In_Instance := Saved_ISMP; 1178 Restore_Ghost_Region (Saved_GM, Saved_IGR); 1179 Restore_SPARK_Mode (Saved_SM, Saved_SMP); 1180 end Load_RTU; 1181 1182 -------------------- 1183 -- Make_Unit_Name -- 1184 -------------------- 1185 1186 function Make_Unit_Name 1187 (U : RT_Unit_Table_Record; 1188 N : Node_Id) return Node_Id is 1189 1190 Nam : Node_Id; 1191 Scop : Entity_Id; 1192 1193 begin 1194 Nam := New_Occurrence_Of (U.Entity, Standard_Location); 1195 Scop := Scope (U.Entity); 1196 1197 if Nkind (N) = N_Defining_Program_Unit_Name then 1198 while Scop /= Standard_Standard loop 1199 Nam := 1200 Make_Expanded_Name (Standard_Location, 1201 Chars => Chars (U.Entity), 1202 Prefix => New_Occurrence_Of (Scop, Standard_Location), 1203 Selector_Name => Nam); 1204 Set_Entity (Nam, U.Entity); 1205 1206 Scop := Scope (Scop); 1207 end loop; 1208 end if; 1209 1210 return Nam; 1211 end Make_Unit_Name; 1212 1213 -------------------- 1214 -- Maybe_Add_With -- 1215 -------------------- 1216 1217 procedure Maybe_Add_With (U : in out RT_Unit_Table_Record) is 1218 begin 1219 -- We do not need to generate a with_clause for a call issued from 1220 -- RTE_Component_Available. However, for CodePeer, we need these 1221 -- additional with's, because for a sequence like "if RTE_Available (X) 1222 -- then ... RTE (X)" the RTE call fails to create some necessary with's. 1223 1224 if RTE_Available_Call and not Generate_SCIL then 1225 return; 1226 end if; 1227 1228 -- Avoid creating directly self-referential with clauses 1229 1230 if Current_Sem_Unit = U.Unum then 1231 return; 1232 end if; 1233 1234 -- Add the with_clause, if we have not already added an implicit with 1235 -- for this unit to the current compilation unit. 1236 1237 declare 1238 LibUnit : constant Node_Id := Unit (Cunit (U.Unum)); 1239 Clause : Node_Id; 1240 Withn : Node_Id; 1241 1242 begin 1243 Clause := U.First_Implicit_With; 1244 while Present (Clause) loop 1245 if Parent (Clause) = Cunit (Current_Sem_Unit) then 1246 return; 1247 end if; 1248 1249 Clause := Next_Implicit_With (Clause); 1250 end loop; 1251 1252 Withn := 1253 Make_With_Clause (Standard_Location, 1254 Name => 1255 Make_Unit_Name 1256 (U, Defining_Unit_Name (Specification (LibUnit)))); 1257 1258 Set_Corresponding_Spec (Withn, U.Entity); 1259 Set_First_Name (Withn); 1260 Set_Implicit_With (Withn); 1261 Set_Library_Unit (Withn, Cunit (U.Unum)); 1262 Set_Next_Implicit_With (Withn, U.First_Implicit_With); 1263 1264 U.First_Implicit_With := Withn; 1265 1266 Mark_Rewrite_Insertion (Withn); 1267 Append (Withn, Context_Items (Cunit (Current_Sem_Unit))); 1268 Check_Restriction_No_Dependence (Name (Withn), Current_Error_Node); 1269 end; 1270 end Maybe_Add_With; 1271 1272 ------------------------ 1273 -- Output_Entity_Name -- 1274 ------------------------ 1275 1276 procedure Output_Entity_Name (Id : RE_Id; Msg : String) is 1277 M : String (1 .. 2048); 1278 P : Natural := 0; 1279 -- M (1 .. P) is current message to be output 1280 1281 RE_Image : constant String := RE_Id'Image (Id); 1282 S : Natural; 1283 -- RE_Image (S .. RE_Image'Last) is the name of the entity without the 1284 -- "RE_" or "RO_XX_" prefix. 1285 1286 begin 1287 if Id = RE_Null then 1288 return; 1289 end if; 1290 1291 M (1 .. 9) := "\entity """; 1292 P := 9; 1293 1294 -- Add unit name to message, excluding %s or %b at end 1295 1296 Get_Name_String (Get_Unit_Name (RE_Unit_Table (Id))); 1297 Name_Len := Name_Len - 2; 1298 Set_Casing (Mixed_Case); 1299 M (P + 1 .. P + Name_Len) := Name_Buffer (1 .. Name_Len); 1300 P := P + Name_Len; 1301 1302 -- Add a qualifying period 1303 1304 M (P + 1) := '.'; 1305 P := P + 1; 1306 1307 -- Strip "RE" 1308 1309 if RE_Image (2) = 'E' then 1310 S := 4; 1311 1312 -- Strip "RO_XX" 1313 1314 else 1315 S := 7; 1316 end if; 1317 1318 -- Add entity name and closing quote to message 1319 1320 Name_Len := RE_Image'Length - S + 1; 1321 Name_Buffer (1 .. Name_Len) := RE_Image (S .. RE_Image'Last); 1322 Set_Casing (Mixed_Case); 1323 M (P + 1 .. P + Name_Len) := Name_Buffer (1 .. Name_Len); 1324 P := P + Name_Len; 1325 M (P + 1) := '"'; 1326 P := P + 1; 1327 1328 -- Add message 1329 1330 M (P + 1) := ' '; 1331 P := P + 1; 1332 M (P + 1 .. P + Msg'Length) := Msg; 1333 P := P + Msg'Length; 1334 1335 -- Output message at current error node location 1336 1337 RTE_Error_Msg (M (1 .. P)); 1338 end Output_Entity_Name; 1339 1340 -------------- 1341 -- RE_Chars -- 1342 -------------- 1343 1344 function RE_Chars (E : RE_Id) return Name_Id is 1345 RE_Name_Chars : constant String := RE_Id'Image (E); 1346 1347 begin 1348 -- Copy name skipping initial RE_ or RO_XX characters 1349 1350 if RE_Name_Chars (1 .. 2) = "RE" then 1351 for J in 4 .. RE_Name_Chars'Last loop 1352 Name_Buffer (J - 3) := Fold_Lower (RE_Name_Chars (J)); 1353 end loop; 1354 1355 Name_Len := RE_Name_Chars'Length - 3; 1356 1357 else 1358 for J in 7 .. RE_Name_Chars'Last loop 1359 Name_Buffer (J - 6) := Fold_Lower (RE_Name_Chars (J)); 1360 end loop; 1361 1362 Name_Len := RE_Name_Chars'Length - 6; 1363 end if; 1364 1365 return Name_Find; 1366 end RE_Chars; 1367 1368 --------- 1369 -- RTE -- 1370 --------- 1371 1372 function RTE (E : RE_Id) return Entity_Id is 1373 procedure Check_RPC; 1374 -- Reject programs that make use of distribution features not supported 1375 -- on the current target. Also check that the PCS is compatible with the 1376 -- code generator version. On such targets (Vxworks, others?) we provide 1377 -- a minimal body for System.Rpc that only supplies an implementation of 1378 -- Partition_Id. 1379 1380 function Find_Local_Entity (E : RE_Id) return Entity_Id; 1381 -- This function is used when entity E is in this compilation's main 1382 -- unit. It gets the value from the already compiled declaration. 1383 1384 --------------- 1385 -- Check_RPC -- 1386 --------------- 1387 1388 procedure Check_RPC is 1389 begin 1390 -- Bypass this check if debug flag -gnatdR set 1391 1392 if Debug_Flag_RR then 1393 return; 1394 end if; 1395 1396 -- Otherwise we need the check if we are going after one of the 1397 -- critical entities in System.RPC / System.Partition_Interface. 1398 1399 if E = RE_Do_Rpc 1400 or else 1401 E = RE_Do_Apc 1402 or else 1403 E = RE_Params_Stream_Type 1404 or else 1405 E = RE_Request_Access 1406 then 1407 -- If generating RCI stubs, check that we have a real PCS 1408 1409 if (Distribution_Stub_Mode = Generate_Receiver_Stub_Body 1410 or else 1411 Distribution_Stub_Mode = Generate_Caller_Stub_Body) 1412 and then Get_PCS_Name = Name_No_DSA 1413 then 1414 Set_Standard_Error; 1415 Write_Str ("distribution feature not supported"); 1416 Write_Eol; 1417 raise Unrecoverable_Error; 1418 1419 -- In all cases, check Exp_Dist and System.Partition_Interface 1420 -- consistency. 1421 1422 elsif Get_PCS_Version /= 1423 Exp_Dist.PCS_Version_Number (Get_PCS_Name) 1424 then 1425 Set_Standard_Error; 1426 Write_Str ("PCS version mismatch: expander "); 1427 Write_Int (Exp_Dist.PCS_Version_Number (Get_PCS_Name)); 1428 Write_Str (", PCS ("); 1429 Write_Name (Get_PCS_Name); 1430 Write_Str (") "); 1431 Write_Int (Get_PCS_Version); 1432 Write_Eol; 1433 raise Unrecoverable_Error; 1434 end if; 1435 end if; 1436 end Check_RPC; 1437 1438 ----------------------- 1439 -- Find_Local_Entity -- 1440 ----------------------- 1441 1442 function Find_Local_Entity (E : RE_Id) return Entity_Id is 1443 RE_Str : constant String := RE_Id'Image (E); 1444 Nam : Name_Id; 1445 Ent : Entity_Id; 1446 1447 Save_Nam : constant String := Name_Buffer (1 .. Name_Len); 1448 -- Save name buffer and length over call 1449 1450 begin 1451 Name_Len := Natural'Max (0, RE_Str'Length - 3); 1452 Name_Buffer (1 .. Name_Len) := 1453 RE_Str (RE_Str'First + 3 .. RE_Str'Last); 1454 1455 Nam := Name_Find; 1456 Ent := Entity_Id (Get_Name_Table_Int (Nam)); 1457 1458 Name_Len := Save_Nam'Length; 1459 Name_Buffer (1 .. Name_Len) := Save_Nam; 1460 1461 return Ent; 1462 end Find_Local_Entity; 1463 1464 -- Local variables 1465 1466 U_Id : constant RTU_Id := RE_Unit_Table (E); 1467 U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id); 1468 1469 Ename : Name_Id; 1470 Lib_Unit : Node_Id; 1471 Pkg_Ent : Entity_Id; 1472 1473 Save_Front_End_Inlining : constant Boolean := Front_End_Inlining; 1474 -- This flag is used to disable front-end inlining when RTE is invoked. 1475 -- This prevents the analysis of other runtime bodies when a particular 1476 -- spec is loaded through Rtsfind. This is both efficient, and prevents 1477 -- spurious visibility conflicts between use-visible user entities, and 1478 -- entities in run-time packages. 1479 1480 -- Start of processing for RTE 1481 1482 begin 1483 -- Doing a rtsfind in system.ads is special, as we cannot do this 1484 -- when compiling System itself. So if we are compiling system then 1485 -- we should already have acquired and processed the declaration 1486 -- of the entity. The test is to see if this compilation's main unit 1487 -- is System. If so, return the value from the already compiled 1488 -- declaration and otherwise do a regular find. 1489 1490 -- Not pleasant, but these kinds of annoying recursion scenarios when 1491 -- writing an Ada compiler in Ada have to be broken somewhere. 1492 1493 if Present (Main_Unit_Entity) 1494 and then Chars (Main_Unit_Entity) = Name_System 1495 and then Analyzed (Main_Unit_Entity) 1496 and then not Is_Child_Unit (Main_Unit_Entity) 1497 then 1498 return Check_CRT (E, Find_Local_Entity (E)); 1499 end if; 1500 1501 Front_End_Inlining := False; 1502 1503 -- Load unit if unit not previously loaded 1504 1505 if No (RE_Table (E)) then 1506 Load_RTU (U_Id, Id => E); 1507 Lib_Unit := Unit (Cunit (U.Unum)); 1508 1509 -- In the subprogram case, we are all done, the entity we want 1510 -- is the entity for the subprogram itself. Note that we do not 1511 -- bother to check that it is the entity that was requested. 1512 -- the only way that could fail to be the case is if runtime is 1513 -- hopelessly misconfigured, and it isn't worth testing for this. 1514 1515 if Nkind (Lib_Unit) = N_Subprogram_Declaration then 1516 RE_Table (E) := U.Entity; 1517 1518 -- Otherwise we must have the package case. First check package 1519 -- entity itself (e.g. RTE_Name for System.Interrupts.Name) 1520 1521 else 1522 pragma Assert (Nkind (Lib_Unit) = N_Package_Declaration); 1523 Ename := RE_Chars (E); 1524 1525 -- First we search the package entity chain. If the package 1526 -- only has a limited view, scan the corresponding list of 1527 -- incomplete types. 1528 1529 if From_Limited_With (U.Entity) then 1530 Pkg_Ent := First_Entity (Limited_View (U.Entity)); 1531 else 1532 Pkg_Ent := First_Entity (U.Entity); 1533 end if; 1534 1535 while Present (Pkg_Ent) loop 1536 if Ename = Chars (Pkg_Ent) then 1537 RE_Table (E) := Pkg_Ent; 1538 Check_RPC; 1539 goto Found; 1540 end if; 1541 1542 Next_Entity (Pkg_Ent); 1543 end loop; 1544 1545 -- If we did not find the entity in the package entity chain, 1546 -- then check if the package entity itself matches. Note that 1547 -- we do this check after searching the entity chain, since 1548 -- the rule is that in case of ambiguity, we prefer the entity 1549 -- defined within the package, rather than the package itself. 1550 1551 if Ename = Chars (U.Entity) then 1552 RE_Table (E) := U.Entity; 1553 end if; 1554 1555 -- If we didn't find the entity we want, something is wrong. 1556 -- We just leave RE_Table (E) set to Empty and the appropriate 1557 -- action will be taken by Check_CRT when we exit. 1558 1559 end if; 1560 end if; 1561 1562 <<Found>> 1563 1564 -- Record whether the secondary stack is in use in order to generate 1565 -- the proper binder code. No action is taken when the secondary stack 1566 -- is pulled within an ignored Ghost context because all this code will 1567 -- disappear. 1568 1569 if U_Id = System_Secondary_Stack and then Ghost_Mode /= Ignore then 1570 Sec_Stack_Used := True; 1571 end if; 1572 1573 Maybe_Add_With (U); 1574 Front_End_Inlining := Save_Front_End_Inlining; 1575 1576 return Check_CRT (E, RE_Table (E)); 1577 end RTE; 1578 1579 ------------------- 1580 -- RTE_Available -- 1581 ------------------- 1582 1583 function RTE_Available (E : RE_Id) return Boolean is 1584 Dummy : Entity_Id; 1585 pragma Warnings (Off, Dummy); 1586 1587 Result : Boolean; 1588 1589 Save_RTE_Available_Call : constant Boolean := RTE_Available_Call; 1590 Save_RTE_Is_Available : constant Boolean := RTE_Is_Available; 1591 -- These are saved recursively because the call to load a unit 1592 -- caused by an upper level call may perform a recursive call 1593 -- to this routine during analysis of the corresponding unit. 1594 1595 begin 1596 RTE_Available_Call := True; 1597 RTE_Is_Available := True; 1598 Dummy := RTE (E); 1599 Result := RTE_Is_Available; 1600 RTE_Available_Call := Save_RTE_Available_Call; 1601 RTE_Is_Available := Save_RTE_Is_Available; 1602 return Result; 1603 1604 exception 1605 when RE_Not_Available => 1606 RTE_Available_Call := Save_RTE_Available_Call; 1607 RTE_Is_Available := Save_RTE_Is_Available; 1608 return False; 1609 end RTE_Available; 1610 1611 -------------------------- 1612 -- RTE_Record_Component -- 1613 -------------------------- 1614 1615 function RTE_Record_Component (E : RE_Id) return Entity_Id is 1616 U_Id : constant RTU_Id := RE_Unit_Table (E); 1617 U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id); 1618 E1 : Entity_Id; 1619 Ename : Name_Id; 1620 Found_E : Entity_Id; 1621 Lib_Unit : Node_Id; 1622 Pkg_Ent : Entity_Id; 1623 1624 -- The following flag is used to disable front-end inlining when 1625 -- RTE_Record_Component is invoked. This prevents the analysis of other 1626 -- runtime bodies when a particular spec is loaded through Rtsfind. This 1627 -- is both efficient, and it prevents spurious visibility conflicts 1628 -- between use-visible user entities, and entities in run-time packages. 1629 1630 Save_Front_End_Inlining : Boolean; 1631 1632 begin 1633 -- Note: Contrary to subprogram RTE, there is no need to do any special 1634 -- management with package system.ads because it has no record type 1635 -- declarations. 1636 1637 Save_Front_End_Inlining := Front_End_Inlining; 1638 Front_End_Inlining := False; 1639 1640 -- Load unit if unit not previously loaded 1641 1642 if not Present (U.Entity) then 1643 Load_RTU (U_Id, Id => E); 1644 end if; 1645 1646 Lib_Unit := Unit (Cunit (U.Unum)); 1647 1648 pragma Assert (Nkind (Lib_Unit) = N_Package_Declaration); 1649 Ename := RE_Chars (E); 1650 1651 -- Search the entity in the components of record type declarations 1652 -- found in the package entity chain. 1653 1654 Found_E := Empty; 1655 Pkg_Ent := First_Entity (U.Entity); 1656 Search : while Present (Pkg_Ent) loop 1657 if Is_Record_Type (Pkg_Ent) then 1658 E1 := First_Entity (Pkg_Ent); 1659 while Present (E1) loop 1660 if Ename = Chars (E1) then 1661 pragma Assert (not Present (Found_E)); 1662 Found_E := E1; 1663 end if; 1664 1665 Next_Entity (E1); 1666 end loop; 1667 end if; 1668 1669 Next_Entity (Pkg_Ent); 1670 end loop Search; 1671 1672 -- If we didn't find the entity we want, something is wrong. The 1673 -- appropriate action will be taken by Check_CRT when we exit. 1674 1675 Maybe_Add_With (U); 1676 1677 Front_End_Inlining := Save_Front_End_Inlining; 1678 return Check_CRT (E, Found_E); 1679 end RTE_Record_Component; 1680 1681 ------------------------------------ 1682 -- RTE_Record_Component_Available -- 1683 ------------------------------------ 1684 1685 function RTE_Record_Component_Available (E : RE_Id) return Boolean is 1686 Dummy : Entity_Id; 1687 pragma Warnings (Off, Dummy); 1688 1689 Result : Boolean; 1690 1691 Save_RTE_Available_Call : constant Boolean := RTE_Available_Call; 1692 Save_RTE_Is_Available : constant Boolean := RTE_Is_Available; 1693 -- These are saved recursively because the call to load a unit 1694 -- caused by an upper level call may perform a recursive call 1695 -- to this routine during analysis of the corresponding unit. 1696 1697 begin 1698 RTE_Available_Call := True; 1699 RTE_Is_Available := True; 1700 Dummy := RTE_Record_Component (E); 1701 Result := RTE_Is_Available; 1702 RTE_Available_Call := Save_RTE_Available_Call; 1703 RTE_Is_Available := Save_RTE_Is_Available; 1704 return Result; 1705 1706 exception 1707 when RE_Not_Available => 1708 RTE_Available_Call := Save_RTE_Available_Call; 1709 RTE_Is_Available := Save_RTE_Is_Available; 1710 return False; 1711 end RTE_Record_Component_Available; 1712 1713 ------------------- 1714 -- RTE_Error_Msg -- 1715 ------------------- 1716 1717 procedure RTE_Error_Msg (Msg : String) is 1718 begin 1719 if RTE_Available_Call then 1720 RTE_Is_Available := False; 1721 else 1722 Error_Msg_N (Msg, Current_Error_Node); 1723 1724 -- Bump count of violations if we are in configurable run-time 1725 -- mode and this is not a continuation message. 1726 1727 if Configurable_Run_Time_Mode and then Msg (Msg'First) /= '\' then 1728 Configurable_Run_Time_Violations := 1729 Configurable_Run_Time_Violations + 1; 1730 end if; 1731 end if; 1732 end RTE_Error_Msg; 1733 1734 ---------------- 1735 -- RTU_Entity -- 1736 ---------------- 1737 1738 function RTU_Entity (U : RTU_Id) return Entity_Id is 1739 begin 1740 return RT_Unit_Table (U).Entity; 1741 end RTU_Entity; 1742 1743 ---------------- 1744 -- RTU_Loaded -- 1745 ---------------- 1746 1747 function RTU_Loaded (U : RTU_Id) return Boolean is 1748 begin 1749 return Present (RT_Unit_Table (U).Entity); 1750 end RTU_Loaded; 1751 1752 -------------------- 1753 -- Set_RTU_Loaded -- 1754 -------------------- 1755 1756 procedure Set_RTU_Loaded (N : Node_Id) is 1757 Loc : constant Source_Ptr := Sloc (N); 1758 Unum : constant Unit_Number_Type := Get_Source_Unit (Loc); 1759 Uname : constant Unit_Name_Type := Unit_Name (Unum); 1760 E : constant Entity_Id := 1761 Defining_Entity (Unit (Cunit (Unum))); 1762 begin 1763 pragma Assert (Is_Predefined_Unit (Unum)); 1764 1765 -- Loop through entries in RTU table looking for matching entry 1766 1767 for U_Id in RTU_Id'Range loop 1768 1769 -- Here we have a match 1770 1771 if Get_Unit_Name (U_Id) = Uname then 1772 declare 1773 U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id); 1774 -- The RT_Unit_Table entry that may need updating 1775 1776 begin 1777 -- If entry is not set, set it now, and indicate that it was 1778 -- loaded through an explicit context clause. 1779 1780 if No (U.Entity) then 1781 U := (Entity => E, 1782 Uname => Get_Unit_Name (U_Id), 1783 Unum => Unum, 1784 First_Implicit_With => Empty); 1785 end if; 1786 1787 return; 1788 end; 1789 end if; 1790 end loop; 1791 end Set_RTU_Loaded; 1792 1793 ------------------------- 1794 -- SPARK_Implicit_Load -- 1795 ------------------------- 1796 1797 procedure SPARK_Implicit_Load (E : RE_Id) is 1798 Unused : Entity_Id; 1799 1800 begin 1801 pragma Assert (GNATprove_Mode); 1802 1803 -- Force loading of a predefined unit 1804 1805 Unused := RTE (E); 1806 end SPARK_Implicit_Load; 1807 1808end Rtsfind; 1809