1------------------------------------------------------------------------------ 2-- -- 3-- GNAT COMPILER COMPONENTS -- 4-- -- 5-- S E M _ P R A G -- 6-- -- 7-- S p e c -- 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 26-- Pragma handling is isolated in a separate package 27-- (logically this processing belongs in chapter 4) 28 29with Namet; use Namet; 30with Opt; use Opt; 31with Snames; use Snames; 32with Types; use Types; 33 34package Sem_Prag is 35 36 -- The following table lists all pragmas that emulate an Ada 2012 aspect 37 38 Aspect_Specifying_Pragma : constant array (Pragma_Id) of Boolean := 39 (Pragma_Abstract_State => True, 40 Pragma_All_Calls_Remote => True, 41 Pragma_Annotate => True, 42 Pragma_Async_Readers => True, 43 Pragma_Async_Writers => True, 44 Pragma_Asynchronous => True, 45 Pragma_Atomic => True, 46 Pragma_Atomic_Components => True, 47 Pragma_Attach_Handler => True, 48 Pragma_Constant_After_Elaboration => True, 49 Pragma_Contract_Cases => True, 50 Pragma_Convention => True, 51 Pragma_CPU => True, 52 Pragma_Default_Initial_Condition => True, 53 Pragma_Default_Storage_Pool => True, 54 Pragma_Depends => True, 55 Pragma_Discard_Names => True, 56 Pragma_Dispatching_Domain => True, 57 Pragma_Effective_Reads => True, 58 Pragma_Effective_Writes => True, 59 Pragma_Elaborate_Body => True, 60 Pragma_Export => True, 61 Pragma_Extensions_Visible => True, 62 Pragma_Favor_Top_Level => True, 63 Pragma_Ghost => True, 64 Pragma_Global => True, 65 Pragma_Import => True, 66 Pragma_Independent => True, 67 Pragma_Independent_Components => True, 68 Pragma_Initial_Condition => True, 69 Pragma_Initializes => True, 70 Pragma_Inline => True, 71 Pragma_Inline_Always => True, 72 Pragma_Interrupt_Handler => True, 73 Pragma_Interrupt_Priority => True, 74 Pragma_Invariant => True, 75 Pragma_Linker_Section => True, 76 Pragma_Lock_Free => True, 77 Pragma_No_Elaboration_Code_All => True, 78 Pragma_No_Return => True, 79 Pragma_Obsolescent => True, 80 Pragma_Pack => True, 81 Pragma_Part_Of => True, 82 Pragma_Persistent_BSS => True, 83 Pragma_Post => True, 84 Pragma_Post_Class => True, 85 Pragma_Postcondition => True, 86 Pragma_Pre => True, 87 Pragma_Pre_Class => True, 88 Pragma_Precondition => True, 89 Pragma_Predicate => True, 90 Pragma_Preelaborable_Initialization => True, 91 Pragma_Preelaborate => True, 92 Pragma_Priority => True, 93 Pragma_Pure => True, 94 Pragma_Pure_Function => True, 95 Pragma_Refined_Depends => True, 96 Pragma_Refined_Global => True, 97 Pragma_Refined_Post => True, 98 Pragma_Refined_State => True, 99 Pragma_Relative_Deadline => True, 100 Pragma_Remote_Access_Type => True, 101 Pragma_Remote_Call_Interface => True, 102 Pragma_Remote_Types => True, 103 Pragma_Secondary_Stack_Size => True, 104 Pragma_Shared => True, 105 Pragma_Shared_Passive => True, 106 Pragma_Simple_Storage_Pool_Type => True, 107 Pragma_SPARK_Mode => True, 108 Pragma_Storage_Size => True, 109 Pragma_Suppress => True, 110 Pragma_Suppress_Debug_Info => True, 111 Pragma_Suppress_Initialization => True, 112 Pragma_Test_Case => True, 113 Pragma_Thread_Local_Storage => True, 114 Pragma_Type_Invariant => True, 115 Pragma_Unchecked_Union => True, 116 Pragma_Universal_Aliasing => True, 117 Pragma_Universal_Data => True, 118 Pragma_Unmodified => True, 119 Pragma_Unreferenced => True, 120 Pragma_Unreferenced_Objects => True, 121 Pragma_Unsuppress => True, 122 Pragma_Volatile => True, 123 Pragma_Volatile_Components => True, 124 Pragma_Volatile_Full_Access => True, 125 Pragma_Warnings => True, 126 others => False); 127 128 -- The following table lists all pragmas that act as an assertion 129 -- expression. 130 131 Assertion_Expression_Pragma : constant array (Pragma_Id) of Boolean := 132 (Pragma_Assert => True, 133 Pragma_Assert_And_Cut => True, 134 Pragma_Assume => True, 135 Pragma_Check => True, 136 Pragma_Contract_Cases => True, 137 Pragma_Default_Initial_Condition => True, 138 Pragma_Initial_Condition => True, 139 Pragma_Invariant => True, 140 Pragma_Loop_Invariant => True, 141 Pragma_Loop_Variant => True, 142 Pragma_Post => True, 143 Pragma_Post_Class => True, 144 Pragma_Postcondition => True, 145 Pragma_Pre => True, 146 Pragma_Pre_Class => True, 147 Pragma_Precondition => True, 148 Pragma_Predicate => True, 149 Pragma_Refined_Post => True, 150 Pragma_Test_Case => True, 151 Pragma_Type_Invariant => True, 152 Pragma_Type_Invariant_Class => True, 153 others => False); 154 155 -- The following table lists all the implementation-defined pragmas that 156 -- should apply to the anonymous object produced by the analysis of a 157 -- single protected or task type. The table should be synchronized with 158 -- Aspect_On_Anonymous_Object_OK in unit Aspects. 159 160 Pragma_On_Anonymous_Object_OK : constant array (Pragma_Id) of Boolean := 161 (Pragma_Depends => True, 162 Pragma_Global => True, 163 Pragma_Part_Of => True, 164 others => False); 165 166 -- The following table lists all the implementation-defined pragmas that 167 -- may apply to a body stub (no language defined pragmas apply). The table 168 -- should be synchronized with Aspect_On_Body_Or_Stub_OK in unit Aspects. 169 170 Pragma_On_Body_Or_Stub_OK : constant array (Pragma_Id) of Boolean := 171 (Pragma_Refined_Depends => True, 172 Pragma_Refined_Global => True, 173 Pragma_Refined_Post => True, 174 Pragma_SPARK_Mode => True, 175 Pragma_Warnings => True, 176 others => False); 177 178 -- The following table lists all pragmas which are significant in SPARK and 179 -- as a result get translated into verification conditions. The table is an 180 -- amalgamation of the pragmas listed in SPARK RM 16.1 and internally added 181 -- entries. 182 183 Pragma_Significant_In_SPARK : constant array (Pragma_Id) of Boolean := 184 (Pragma_All_Calls_Remote => False, 185 Pragma_Asynchronous => False, 186 Pragma_Default_Storage_Pool => False, 187 Pragma_Discard_Names => False, 188 Pragma_Dispatching_Domain => False, 189 Pragma_Priority_Specific_Dispatching => False, 190 Pragma_Remote_Call_Interface => False, 191 Pragma_Remote_Types => False, 192 Pragma_Shared_Passive => False, 193 Pragma_Task_Dispatching_Policy => False, 194 Pragma_Unmodified => False, 195 Pragma_Unreferenced => False, 196 Pragma_Warnings => False, 197 others => True); 198 199 ----------------- 200 -- Subprograms -- 201 ----------------- 202 203 procedure Analyze_Pragma (N : Node_Id); 204 -- Analyze procedure for pragma reference node N 205 206 procedure Analyze_Contract_Cases_In_Decl_Part 207 (N : Node_Id; 208 Freeze_Id : Entity_Id := Empty); 209 -- Perform full analysis of delayed pragma Contract_Cases. Freeze_Id is the 210 -- entity of [generic] package body or [generic] subprogram body which 211 -- caused "freezing" of the related contract where the pragma resides. 212 213 procedure Analyze_Depends_In_Decl_Part (N : Node_Id); 214 -- Perform full analysis of delayed pragma Depends. This routine is also 215 -- capable of performing basic analysis of pragma Refined_Depends. 216 217 procedure Analyze_External_Property_In_Decl_Part 218 (N : Node_Id; 219 Expr_Val : out Boolean); 220 -- Perform full analysis of delayed pragmas Async_Readers, Async_Writers, 221 -- Effective_Reads, Effective_Writes and No_Caching. Flag Expr_Val contains 222 -- the Boolean argument of the pragma or a default True if no argument 223 -- is present. 224 225 procedure Analyze_Global_In_Decl_Part (N : Node_Id); 226 -- Perform full analysis of delayed pragma Global. This routine is also 227 -- capable of performing basic analysis of pragma Refined_Global. 228 229 procedure Analyze_Initial_Condition_In_Decl_Part (N : Node_Id); 230 -- Perform full analysis of delayed pragma Initial_Condition 231 232 procedure Analyze_Initializes_In_Decl_Part (N : Node_Id); 233 -- Perform full analysis of delayed pragma Initializes 234 235 procedure Analyze_Part_Of_In_Decl_Part 236 (N : Node_Id; 237 Freeze_Id : Entity_Id := Empty); 238 -- Perform full analysis of delayed pragma Part_Of. Freeze_Id is the entity 239 -- of [generic] package body or [generic] subprogram body which caused the 240 -- "freezing" of the related contract where the pragma resides. 241 242 procedure Analyze_Pre_Post_Condition_In_Decl_Part 243 (N : Node_Id; 244 Freeze_Id : Entity_Id := Empty); 245 -- Perform full analysis of pragmas Precondition and Postcondition. 246 -- Freeze_Id denotes the entity of [generic] package body or [generic] 247 -- subprogram body which caused "freezing" of the related contract where 248 -- the pragma resides. 249 250 procedure Analyze_Refined_Depends_In_Decl_Part (N : Node_Id); 251 -- Preform full analysis of delayed pragma Refined_Depends. This routine 252 -- uses Analyze_Depends_In_Decl_Part as a starting point, then performs 253 -- various consistency checks between Depends and Refined_Depends. 254 255 procedure Analyze_Refined_Global_In_Decl_Part (N : Node_Id); 256 -- Perform full analysis of delayed pragma Refined_Global. This routine 257 -- uses Analyze_Global_In_Decl_Part as a starting point, then performs 258 -- various consistency checks between Global and Refined_Global. 259 260 procedure Analyze_Refined_State_In_Decl_Part 261 (N : Node_Id; 262 Freeze_Id : Entity_Id := Empty); 263 -- Perform full analysis of delayed pragma Refined_State. Freeze_Id denotes 264 -- the entity of [generic] package body or [generic] subprogram body which 265 -- caused "freezing" of the related contract where the pragma resides. 266 267 procedure Analyze_Test_Case_In_Decl_Part (N : Node_Id); 268 -- Perform preanalysis of pragma Test_Case 269 270 function Build_Pragma_Check_Equivalent 271 (Prag : Node_Id; 272 Subp_Id : Entity_Id := Empty; 273 Inher_Id : Entity_Id := Empty; 274 Keep_Pragma_Id : Boolean := False) return Node_Id; 275 -- Transform a pre- or [refined] postcondition denoted by Prag into an 276 -- equivalent pragma Check. When the pre- or postcondition is inherited, 277 -- the routine replaces the references of all formals of Inher_Id 278 -- and primitive operations of its controlling type by references 279 -- to the corresponding entities of Subp_Id and the descendant type. 280 -- Keep_Pragma_Id is True when the newly created pragma should be 281 -- in fact of the same kind as the source pragma Prag. This is used 282 -- in GNATprove_Mode to generate the inherited pre- and postconditions. 283 284 procedure Check_Applicable_Policy (N : Node_Id); 285 -- N is either an N_Aspect or an N_Pragma node. There are two cases. If 286 -- the name of the aspect or pragma is not one of those recognized as 287 -- an assertion kind by an Assertion_Policy pragma, then the call has 288 -- no effect. Note that in the case of a pragma derived from an aspect, 289 -- the name we use for the purpose of this procedure is the aspect name, 290 -- which may be different from the pragma name (e.g. Precondition for 291 -- Pre aspect). In addition, 'Class aspects are recognized (and the 292 -- corresponding special names used in the processing). 293 -- 294 -- If the name is a valid assertion kind name, then the Check_Policy pragma 295 -- chain is checked for a matching entry (or for an Assertion entry which 296 -- matches all possibilities). If a matching entry is found then the policy 297 -- is checked. If it is On or Check, then the Is_Checked flag is set in 298 -- the aspect or pragma node. If it is Off, Ignore, or Disable, then the 299 -- Is_Ignored flag is set in the aspect or pragma node. Additionally for 300 -- policy Disable, the Is_Disabled flag is set. 301 -- 302 -- If no matching Check_Policy pragma is found then the effect depends on 303 -- whether -gnata was used, if so, then the call has no effect, otherwise 304 -- Is_Ignored (but not Is_Disabled) is set True. 305 306 procedure Check_External_Properties 307 (Item : Node_Id; 308 AR : Boolean; 309 AW : Boolean; 310 ER : Boolean; 311 EW : Boolean); 312 -- Flags AR, AW, ER and EW denote the static values of external properties 313 -- Async_Readers, Async_Writers, Effective_Reads and Effective_Writes. Item 314 -- is the related variable or state. Ensure legality of the combination and 315 -- issue an error for an illegal combination. 316 317 function Check_Kind (Nam : Name_Id) return Name_Id; 318 -- This function is used in connection with pragmas Assert, Check, 319 -- and assertion aspects and pragmas, to determine if Check pragmas 320 -- (or corresponding assertion aspects or pragmas) are currently active 321 -- as determined by the presence of -gnata on the command line (which 322 -- sets the default), and the appearance of pragmas Check_Policy and 323 -- Assertion_Policy as configuration pragmas either in a configuration 324 -- pragma file, or at the start of the current unit, or locally given 325 -- Check_Policy and Assertion_Policy pragmas that are currently active. 326 -- 327 -- The value returned is one of the names Check, Ignore, Disable (On 328 -- returns Check, and Off returns Ignore). 329 -- 330 -- Note: for assertion kinds Pre'Class, Post'Class, Invariant'Class, 331 -- and Type_Invariant'Class, the name passed is Name_uPre, Name_uPost, 332 -- Name_uInvariant, or Name_uType_Invariant, which corresponds to _Pre, 333 -- _Post, _Invariant, or _Type_Invariant, which are special names used 334 -- in identifiers to represent these attribute references. 335 336 procedure Check_Missing_Part_Of (Item_Id : Entity_Id); 337 -- Determine whether the placement within the state space of an abstract 338 -- state, variable or package instantiation denoted by Item_Id requires the 339 -- use of indicator/option Part_Of. If this is the case, emit an error. 340 341 procedure Collect_Inherited_Class_Wide_Conditions (Subp : Entity_Id); 342 -- In GNATprove mode, when analyzing an overriding subprogram, check 343 -- whether the overridden operations have class-wide pre/postconditions, 344 -- and generate the corresponding pragmas. The pragmas are inserted after 345 -- the subprogram declaration, together with those generated for other 346 -- aspects of the subprogram. 347 348 procedure Collect_Subprogram_Inputs_Outputs 349 (Subp_Id : Entity_Id; 350 Synthesize : Boolean := False; 351 Subp_Inputs : in out Elist_Id; 352 Subp_Outputs : in out Elist_Id; 353 Global_Seen : out Boolean); 354 -- Subsidiary to the analysis of pragmas Depends, Global, Refined_Depends 355 -- and Refined_Global. The routine is also used by GNATprove. Collect all 356 -- inputs and outputs of subprogram Subp_Id in lists Subp_Inputs (inputs) 357 -- and Subp_Outputs (outputs). The inputs and outputs are gathered from: 358 -- 1) The formal parameters of the subprogram 359 -- 2) The generic formal parameters of the generic subprogram 360 -- 3) The current instance of a concurrent type 361 -- 4) The items of pragma [Refined_]Global 362 -- or 363 -- 5) The items of pragma [Refined_]Depends if there is no pragma 364 -- [Refined_]Global present and flag Synthesize is set to True. 365 -- If the subprogram has no inputs and/or outputs, then the returned list 366 -- is No_Elist. Flag Global_Seen is set when the related subprogram has 367 -- pragma [Refined_]Global. 368 369 function Delay_Config_Pragma_Analyze (N : Node_Id) return Boolean; 370 -- N is a pragma appearing in a configuration pragma file. Most such 371 -- pragmas are analyzed when the file is read, before parsing and analyzing 372 -- the main unit. However, the analysis of certain pragmas results in 373 -- adding information to the compiled main unit, and this cannot be done 374 -- till the main unit is processed. Such pragmas return True from this 375 -- function and in Frontend pragmas where Delay_Config_Pragma_Analyze is 376 -- True have their analysis delayed until after the main program is parsed 377 -- and analyzed. 378 379 function Find_Related_Package_Or_Body 380 (Prag : Node_Id; 381 Do_Checks : Boolean := False) return Node_Id; 382 -- Subsidiary to the analysis of pragmas 383 -- Abstract_State 384 -- Initial_Condition 385 -- Initializes 386 -- Refined_State 387 -- Find the declaration of the related package [body] subject to pragma 388 -- Prag. The return value is either N_Package_Declaration, N_Package_Body, 389 -- or Empty if the placement of the pragma is illegal. If flag Do_Checks is 390 -- set, the routine reports duplicate pragmas. 391 392 function Find_Related_Declaration_Or_Body 393 (Prag : Node_Id; 394 Do_Checks : Boolean := False) return Node_Id; 395 -- Subsidiary to the analysis of pragmas 396 -- Contract_Cases 397 -- Depends 398 -- Extensions_Visible 399 -- Global 400 -- Initializes 401 -- Max_Entry_Queue_Depth 402 -- Max_Entry_Queue_Length 403 -- Max_Queue_Length 404 -- Post 405 -- Post_Class 406 -- Postcondition 407 -- Pre 408 -- Pre_Class 409 -- Precondition 410 -- Refined_Depends 411 -- Refined_Global 412 -- Refined_Post 413 -- Refined_State 414 -- Test_Case 415 -- Volatile_Function 416 -- as well as attributes 'Old and 'Result. Find the declaration of the 417 -- related entry, subprogram or task type [body] subject to pragma Prag. 418 -- If flag Do_Checks is set, the routine reports duplicate pragmas and 419 -- detects improper use of refinement pragmas in stand alone expression 420 -- functions. 421 422 function Get_Argument 423 (Prag : Node_Id; 424 Context_Id : Node_Id := Empty) return Node_Id; 425 -- Obtain the argument of pragma Prag depending on context and the nature 426 -- of the pragma. The argument is extracted in the following manner: 427 -- 428 -- When the pragma is generated from an aspect, return the corresponding 429 -- aspect for ASIS or when Context_Id denotes a generic unit. 430 -- 431 -- Otherwise return the first argument of Prag 432 -- 433 -- Context denotes the entity of the function, package or procedure where 434 -- Prag resides. 435 436 function Get_SPARK_Mode_From_Annotation 437 (N : Node_Id) return SPARK_Mode_Type; 438 -- Given an aspect or pragma SPARK_Mode node, return corresponding mode id 439 440 procedure Initialize; 441 -- Initializes data structures used for pragma processing. Must be called 442 -- before analyzing each new main source program. 443 444 function Is_Config_Static_String (Arg : Node_Id) return Boolean; 445 -- This is called for a configuration pragma that requires either string 446 -- literal or a concatenation of string literals. We cannot use normal 447 -- static string processing because it is too early in the case of the 448 -- pragma appearing in a configuration pragmas file. If Arg is of an 449 -- appropriate form, then this call obtains the string (doing any necessary 450 -- concatenations) and places it in Name_Buffer, setting Name_Len to its 451 -- length, and then returns True. If it is not of the correct form, then an 452 -- appropriate error message is posted, and False is returned. 453 454 function Is_Elaboration_SPARK_Mode (N : Node_Id) return Boolean; 455 -- Determine whether pragma SPARK_Mode appears in the statement part of a 456 -- package body. 457 458 function Is_Enabled_Pragma (Prag : Node_Id) return Boolean; 459 -- Determine whether a Boolean-like SPARK pragma Prag is enabled. To be 460 -- considered enabled, the pragma must either: 461 -- * Appear without its Boolean expression 462 -- * The Boolean expression evaluates to "True" 463 -- 464 -- Boolean-like SPARK pragmas differ from pure Boolean Ada pragmas in that 465 -- their optional Boolean expression must be static and cannot benefit from 466 -- forward references. The following are Boolean-like SPARK pragmas: 467 -- Async_Readers 468 -- Async_Writers 469 -- Constant_After_Elaboration 470 -- Effective_Reads 471 -- Effective_Writes 472 -- Extensions_Visible 473 -- Volatile_Function 474 475 function Is_Non_Significant_Pragma_Reference (N : Node_Id) return Boolean; 476 -- The node N is a node for an entity and the issue is whether the 477 -- occurrence is a reference for the purposes of giving warnings about 478 -- unreferenced variables. This function returns True if the reference is 479 -- not a reference from this point of view (e.g. the occurrence in a pragma 480 -- Pack) and False if it is a real reference (e.g. the occurrence in a 481 -- pragma Export); 482 483 function Is_Pragma_String_Literal (Par : Node_Id) return Boolean; 484 -- Given an N_Pragma_Argument_Association node, Par, which has the form of 485 -- an operator symbol, determines whether or not it should be treated as an 486 -- string literal. This is called by Sem_Ch6.Analyze_Operator_Symbol. If 487 -- True is returned, the argument is converted to a string literal. If 488 -- False is returned, then the argument is treated as an entity reference 489 -- to the operator. 490 491 function Is_Private_SPARK_Mode (N : Node_Id) return Boolean; 492 -- Determine whether pragma SPARK_Mode appears in the private part of a 493 -- package. 494 495 function Is_Valid_Assertion_Kind (Nam : Name_Id) return Boolean; 496 -- Returns True if Nam is one of the names recognized as a valid assertion 497 -- kind by the Assertion_Policy pragma. Note that the 'Class cases are 498 -- represented by the corresponding special names Name_uPre, Name_uPost, 499 -- Name_uInvariant, and Name_uType_Invariant (_Pre, _Post, _Invariant, 500 -- and _Type_Invariant). 501 502 procedure Process_Compilation_Unit_Pragmas (N : Node_Id); 503 -- Called at the start of processing compilation unit N to deal with any 504 -- special issues regarding pragmas. In particular, we have to deal with 505 -- Suppress_All at this stage, since it can appear after the unit instead 506 -- of before (actually we allow it to appear anywhere). 507 508 procedure Relocate_Pragmas_To_Anonymous_Object 509 (Typ_Decl : Node_Id; 510 Obj_Decl : Node_Id); 511 -- Relocate all pragmas that appear in the visible declarations of task or 512 -- protected type declaration Typ_Decl after the declaration of anonymous 513 -- object Obj_Decl. Table Pragmas_On_Anonymous_Object_OK contains the list 514 -- of candidate pragmas. 515 516 procedure Relocate_Pragmas_To_Body 517 (Subp_Body : Node_Id; 518 Target_Body : Node_Id := Empty); 519 -- Resocate all pragmas that follow and apply to subprogram body Subp_Body 520 -- to its own declaration list. Candidate pragmas are classified in table 521 -- Pragma_On_Body_Or_Stub_OK. If Target_Body is set, the pragma are moved 522 -- to the declarations of Target_Body. This formal should be set when 523 -- dealing with subprogram body stubs or expression functions. 524 525 procedure Set_Encoded_Interface_Name (E : Entity_Id; S : Node_Id); 526 -- This routine is used to set an encoded interface name. The node S is 527 -- an N_String_Literal node for the external name to be set, and E is an 528 -- entity whose Interface_Name field is to be set. In the normal case where 529 -- S contains a name that is a valid C identifier, then S is simply set as 530 -- the value of the Interface_Name. Otherwise it is encoded as needed by 531 -- particular operating systems. See the body for details of the encoding. 532 533 function Test_Case_Arg 534 (Prag : Node_Id; 535 Arg_Nam : Name_Id; 536 From_Aspect : Boolean := False) return Node_Id; 537 -- Obtain argument "Name", "Mode", "Ensures" or "Requires" from Test_Case 538 -- pragma Prag as denoted by Arg_Nam. When From_Aspect is set, an attempt 539 -- is made to retrieve the argument from the corresponding aspect if there 540 -- is one. The returned argument has several formats: 541 -- 542 -- N_Pragma_Argument_Association if retrieved directly from the pragma 543 -- 544 -- N_Component_Association if retrieved from the corresponding aspect and 545 -- the argument appears in a named association form. 546 -- 547 -- An arbitrary expression if retrieved from the corresponding aspect and 548 -- the argument appears in positional form. 549 -- 550 -- Empty if there is no such argument 551 552 procedure Validate_Compile_Time_Warning_Errors; 553 -- This routine is called after calling the back end to validate pragmas 554 -- Compile_Time_Error and Compile_Time_Warning for size and alignment 555 -- appropriateness. The reason it is called that late is to take advantage 556 -- of any back-annotation of size and alignment performed by the back end. 557 558end Sem_Prag; 559