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) 1992-2021, 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_CUDA_Device => True, 53 Pragma_CUDA_Global => True, 54 Pragma_Default_Initial_Condition => True, 55 Pragma_Default_Storage_Pool => True, 56 Pragma_Depends => True, 57 Pragma_Discard_Names => True, 58 Pragma_Dispatching_Domain => True, 59 Pragma_Effective_Reads => True, 60 Pragma_Effective_Writes => True, 61 Pragma_Elaborate_Body => True, 62 Pragma_Export => True, 63 Pragma_Extensions_Visible => True, 64 Pragma_Favor_Top_Level => True, 65 Pragma_Ghost => True, 66 Pragma_Global => True, 67 Pragma_GNAT_Annotate => True, 68 Pragma_Import => True, 69 Pragma_Independent => True, 70 Pragma_Independent_Components => True, 71 Pragma_Initial_Condition => True, 72 Pragma_Initializes => True, 73 Pragma_Inline => True, 74 Pragma_Inline_Always => True, 75 Pragma_Interrupt_Handler => True, 76 Pragma_Interrupt_Priority => True, 77 Pragma_Invariant => True, 78 Pragma_Linker_Section => True, 79 Pragma_Lock_Free => True, 80 Pragma_No_Elaboration_Code_All => True, 81 Pragma_No_Return => True, 82 Pragma_Obsolescent => True, 83 Pragma_Pack => True, 84 Pragma_Part_Of => True, 85 Pragma_Persistent_BSS => True, 86 Pragma_Post => True, 87 Pragma_Post_Class => True, 88 Pragma_Postcondition => True, 89 Pragma_Pre => True, 90 Pragma_Pre_Class => True, 91 Pragma_Precondition => True, 92 Pragma_Predicate => True, 93 Pragma_Preelaborable_Initialization => True, 94 Pragma_Preelaborate => True, 95 Pragma_Priority => True, 96 Pragma_Pure => True, 97 Pragma_Pure_Function => True, 98 Pragma_Refined_Depends => True, 99 Pragma_Refined_Global => True, 100 Pragma_Refined_Post => True, 101 Pragma_Refined_State => True, 102 Pragma_Relative_Deadline => True, 103 Pragma_Remote_Access_Type => True, 104 Pragma_Remote_Call_Interface => True, 105 Pragma_Remote_Types => True, 106 Pragma_Secondary_Stack_Size => True, 107 Pragma_Shared => True, 108 Pragma_Shared_Passive => True, 109 Pragma_Simple_Storage_Pool_Type => True, 110 Pragma_SPARK_Mode => True, 111 Pragma_Storage_Size => True, 112 Pragma_Suppress => True, 113 Pragma_Suppress_Debug_Info => True, 114 Pragma_Suppress_Initialization => True, 115 Pragma_Test_Case => True, 116 Pragma_Thread_Local_Storage => True, 117 Pragma_Type_Invariant => True, 118 Pragma_Unchecked_Union => True, 119 Pragma_Universal_Aliasing => True, 120 Pragma_Unmodified => True, 121 Pragma_Unreferenced => True, 122 Pragma_Unreferenced_Objects => True, 123 Pragma_Unsuppress => True, 124 Pragma_Volatile => True, 125 Pragma_Volatile_Components => True, 126 Pragma_Volatile_Full_Access => True, 127 Pragma_Warnings => True, 128 others => False); 129 130 -- The following table lists all pragmas that act as an assertion 131 -- expression. 132 133 Assertion_Expression_Pragma : constant array (Pragma_Id) of Boolean := 134 (Pragma_Assert => True, 135 Pragma_Assert_And_Cut => True, 136 Pragma_Assume => True, 137 Pragma_Check => True, 138 Pragma_Contract_Cases => True, 139 Pragma_Default_Initial_Condition => True, 140 Pragma_Initial_Condition => True, 141 Pragma_Invariant => True, 142 Pragma_Loop_Invariant => True, 143 Pragma_Loop_Variant => True, 144 Pragma_Post => True, 145 Pragma_Post_Class => True, 146 Pragma_Postcondition => True, 147 Pragma_Pre => True, 148 Pragma_Pre_Class => True, 149 Pragma_Precondition => True, 150 Pragma_Predicate => True, 151 Pragma_Refined_Post => True, 152 Pragma_Test_Case => True, 153 Pragma_Type_Invariant => True, 154 Pragma_Type_Invariant_Class => True, 155 others => False); 156 157 -- The following table lists all the implementation-defined pragmas that 158 -- should apply to the anonymous object produced by the analysis of a 159 -- single protected or task type. The table should be synchronized with 160 -- Aspect_On_Anonymous_Object_OK in unit Aspects. 161 162 Pragma_On_Anonymous_Object_OK : constant array (Pragma_Id) of Boolean := 163 (Pragma_Depends => True, 164 Pragma_Global => True, 165 Pragma_Part_Of => True, 166 others => False); 167 168 -- The following table lists all the implementation-defined pragmas that 169 -- may apply to a body stub (no language defined pragmas apply). The table 170 -- should be synchronized with Aspect_On_Body_Or_Stub_OK in unit Aspects. 171 172 Pragma_On_Body_Or_Stub_OK : constant array (Pragma_Id) of Boolean := 173 (Pragma_Refined_Depends => True, 174 Pragma_Refined_Global => True, 175 Pragma_Refined_Post => True, 176 Pragma_SPARK_Mode => True, 177 Pragma_Warnings => True, 178 others => False); 179 180 -- The following table lists all pragmas which are significant in SPARK and 181 -- as a result get translated into verification conditions. The table is an 182 -- amalgamation of the pragmas listed in SPARK RM 16.1 and internally added 183 -- entries. 184 185 Pragma_Significant_In_SPARK : constant array (Pragma_Id) of Boolean := 186 (Pragma_All_Calls_Remote => False, 187 Pragma_Asynchronous => False, 188 Pragma_Default_Storage_Pool => False, 189 Pragma_Discard_Names => False, 190 Pragma_Dispatching_Domain => False, 191 Pragma_Priority_Specific_Dispatching => False, 192 Pragma_Remote_Call_Interface => False, 193 Pragma_Remote_Types => False, 194 Pragma_Shared_Passive => False, 195 Pragma_Task_Dispatching_Policy => False, 196 Pragma_Unmodified => False, 197 Pragma_Unreferenced => False, 198 Pragma_Warnings => False, 199 others => True); 200 201 ----------------- 202 -- Subprograms -- 203 ----------------- 204 205 procedure Analyze_Pragma (N : Node_Id); 206 -- Analyze procedure for pragma reference node N 207 208 procedure Analyze_Contract_Cases_In_Decl_Part 209 (N : Node_Id; 210 Freeze_Id : Entity_Id := Empty); 211 -- Perform full analysis of delayed pragma Contract_Cases. Freeze_Id is the 212 -- entity of [generic] package body or [generic] subprogram body which 213 -- caused "freezing" of the related contract where the pragma resides. 214 215 procedure Analyze_Depends_In_Decl_Part (N : Node_Id); 216 -- Perform full analysis of delayed pragma Depends. This routine is also 217 -- capable of performing basic analysis of pragma Refined_Depends. 218 219 procedure Analyze_External_Property_In_Decl_Part 220 (N : Node_Id; 221 Expr_Val : out Boolean); 222 -- Perform full analysis of delayed pragmas Async_Readers, Async_Writers, 223 -- Effective_Reads, Effective_Writes and No_Caching. Flag Expr_Val contains 224 -- the Boolean argument of the pragma or a default True if no argument 225 -- is present. 226 227 procedure Analyze_Global_In_Decl_Part (N : Node_Id); 228 -- Perform full analysis of delayed pragma Global. This routine is also 229 -- capable of performing basic analysis of pragma Refined_Global. 230 231 procedure Analyze_Initial_Condition_In_Decl_Part (N : Node_Id); 232 -- Perform full analysis of delayed pragma Initial_Condition 233 234 procedure Analyze_Initializes_In_Decl_Part (N : Node_Id); 235 -- Perform full analysis of delayed pragma Initializes 236 237 procedure Analyze_Part_Of_In_Decl_Part 238 (N : Node_Id; 239 Freeze_Id : Entity_Id := Empty); 240 -- Perform full analysis of delayed pragma Part_Of. Freeze_Id is the entity 241 -- of [generic] package body or [generic] subprogram body which caused the 242 -- "freezing" of the related contract where the pragma resides. 243 244 procedure Analyze_Pre_Post_Condition_In_Decl_Part 245 (N : Node_Id; 246 Freeze_Id : Entity_Id := Empty); 247 -- Perform full analysis of pragmas Precondition and Postcondition. 248 -- Freeze_Id denotes the entity of [generic] package body or [generic] 249 -- subprogram body which caused "freezing" of the related contract where 250 -- the pragma resides. 251 252 procedure Analyze_Refined_Depends_In_Decl_Part (N : Node_Id); 253 -- Preform full analysis of delayed pragma Refined_Depends. This routine 254 -- uses Analyze_Depends_In_Decl_Part as a starting point, then performs 255 -- various consistency checks between Depends and Refined_Depends. 256 257 procedure Analyze_Refined_Global_In_Decl_Part (N : Node_Id); 258 -- Perform full analysis of delayed pragma Refined_Global. This routine 259 -- uses Analyze_Global_In_Decl_Part as a starting point, then performs 260 -- various consistency checks between Global and Refined_Global. 261 262 procedure Analyze_Refined_State_In_Decl_Part 263 (N : Node_Id; 264 Freeze_Id : Entity_Id := Empty); 265 -- Perform full analysis of delayed pragma Refined_State. Freeze_Id denotes 266 -- the entity of [generic] package body or [generic] subprogram body which 267 -- caused "freezing" of the related contract where the pragma resides. 268 269 procedure Analyze_Subprogram_Variant_In_Decl_Part 270 (N : Node_Id; 271 Freeze_Id : Entity_Id := Empty); 272 -- Perform full analysis of delayed pragma Subprogram_Variant. Freeze_Id is 273 -- the entity of [generic] package body or [generic] subprogram body which 274 -- caused "freezing" of the related contract where the pragma resides. 275 276 procedure Analyze_Test_Case_In_Decl_Part (N : Node_Id); 277 -- Perform preanalysis of pragma Test_Case 278 279 function Build_Pragma_Check_Equivalent 280 (Prag : Node_Id; 281 Subp_Id : Entity_Id := Empty; 282 Inher_Id : Entity_Id := Empty; 283 Keep_Pragma_Id : Boolean := False) return Node_Id; 284 -- Transform a pre- or [refined] postcondition denoted by Prag into an 285 -- equivalent pragma Check. When the pre- or postcondition is inherited, 286 -- the routine replaces the references of all formals of Inher_Id 287 -- and primitive operations of its controlling type by references 288 -- to the corresponding entities of Subp_Id and the descendant type. 289 -- Keep_Pragma_Id is True when the newly created pragma should be 290 -- in fact of the same kind as the source pragma Prag. This is used 291 -- in GNATprove_Mode to generate the inherited pre- and postconditions. 292 293 procedure Check_Applicable_Policy (N : Node_Id); 294 -- N is either an N_Aspect or an N_Pragma node. There are two cases. If 295 -- the name of the aspect or pragma is not one of those recognized as 296 -- an assertion kind by an Assertion_Policy pragma, then the call has 297 -- no effect. Note that in the case of a pragma derived from an aspect, 298 -- the name we use for the purpose of this procedure is the aspect name, 299 -- which may be different from the pragma name (e.g. Precondition for 300 -- Pre aspect). In addition, 'Class aspects are recognized (and the 301 -- corresponding special names used in the processing). 302 -- 303 -- If the name is a valid assertion kind name, then the Check_Policy pragma 304 -- chain is checked for a matching entry (or for an Assertion entry which 305 -- matches all possibilities). If a matching entry is found then the policy 306 -- is checked. If it is On or Check, then the Is_Checked flag is set in 307 -- the aspect or pragma node. If it is Off, Ignore, or Disable, then the 308 -- Is_Ignored flag is set in the aspect or pragma node. Additionally for 309 -- policy Disable, the Is_Disabled flag is set. 310 -- 311 -- If no matching Check_Policy pragma is found then the effect depends on 312 -- whether -gnata was used, if so, then the call has no effect, otherwise 313 -- Is_Ignored (but not Is_Disabled) is set True. 314 315 procedure Check_External_Properties 316 (Item : Node_Id; 317 AR : Boolean; 318 AW : Boolean; 319 ER : Boolean; 320 EW : Boolean); 321 -- Flags AR, AW, ER and EW denote the static values of external properties 322 -- Async_Readers, Async_Writers, Effective_Reads and Effective_Writes. Item 323 -- is the related variable or state. Ensure legality of the combination and 324 -- issue an error for an illegal combination. 325 326 function Check_Kind (Nam : Name_Id) return Name_Id; 327 -- This function is used in connection with pragmas Assert, Check, 328 -- and assertion aspects and pragmas, to determine if Check pragmas 329 -- (or corresponding assertion aspects or pragmas) are currently active 330 -- as determined by the presence of -gnata on the command line (which 331 -- sets the default), and the appearance of pragmas Check_Policy and 332 -- Assertion_Policy as configuration pragmas either in a configuration 333 -- pragma file, or at the start of the current unit, or locally given 334 -- Check_Policy and Assertion_Policy pragmas that are currently active. 335 -- 336 -- The value returned is one of the names Check, Ignore, Disable (On 337 -- returns Check, and Off returns Ignore). 338 -- 339 -- Note: for assertion kinds Pre'Class, Post'Class, Invariant'Class, 340 -- and Type_Invariant'Class, the name passed is Name_uPre, Name_uPost, 341 -- Name_uInvariant, or Name_uType_Invariant, which corresponds to _Pre, 342 -- _Post, _Invariant, or _Type_Invariant, which are special names used 343 -- in identifiers to represent these attribute references. 344 345 procedure Check_Missing_Part_Of (Item_Id : Entity_Id); 346 -- Determine whether the placement within the state space of an abstract 347 -- state, variable or package instantiation denoted by Item_Id requires the 348 -- use of indicator/option Part_Of. If this is the case, emit an error. 349 350 procedure Collect_Inherited_Class_Wide_Conditions (Subp : Entity_Id); 351 -- In GNATprove mode, when analyzing an overriding subprogram, check 352 -- whether the overridden operations have class-wide pre/postconditions, 353 -- and generate the corresponding pragmas. The pragmas are inserted after 354 -- the subprogram declaration, together with those generated for other 355 -- aspects of the subprogram. 356 357 procedure Collect_Subprogram_Inputs_Outputs 358 (Subp_Id : Entity_Id; 359 Synthesize : Boolean := False; 360 Subp_Inputs : in out Elist_Id; 361 Subp_Outputs : in out Elist_Id; 362 Global_Seen : out Boolean); 363 -- Subsidiary to the analysis of pragmas Depends, Global, Refined_Depends 364 -- and Refined_Global. Collect all inputs and outputs of subprogram Subp_Id 365 -- in lists Subp_Inputs (inputs) and Subp_Outputs (outputs). The inputs and 366 -- outputs are gathered from: 367 -- 1) The formal parameters of the subprogram 368 -- 2) The generic formal parameters of the generic subprogram 369 -- 3) The current instance of a concurrent type 370 -- 4) The items of pragma [Refined_]Global 371 -- or 372 -- 5) The items of pragma [Refined_]Depends if there is no pragma 373 -- [Refined_]Global present and flag Synthesize is set to True. 374 -- If the subprogram has no inputs and/or outputs, then the returned list 375 -- is No_Elist. Flag Global_Seen is set when the related subprogram has 376 -- pragma [Refined_]Global. 377 378 function Delay_Config_Pragma_Analyze (N : Node_Id) return Boolean; 379 -- N is a pragma appearing in a configuration pragma file. Most such 380 -- pragmas are analyzed when the file is read, before parsing and analyzing 381 -- the main unit. However, the analysis of certain pragmas results in 382 -- adding information to the compiled main unit, and this cannot be done 383 -- till the main unit is processed. Such pragmas return True from this 384 -- function and in Frontend pragmas where Delay_Config_Pragma_Analyze is 385 -- True have their analysis delayed until after the main program is parsed 386 -- and analyzed. 387 388 function Find_Related_Package_Or_Body 389 (Prag : Node_Id; 390 Do_Checks : Boolean := False) return Node_Id; 391 -- Subsidiary to the analysis of pragmas 392 -- Abstract_State 393 -- Initial_Condition 394 -- Initializes 395 -- Refined_State 396 -- Find the declaration of the related package [body] subject to pragma 397 -- Prag. The return value is either N_Package_Declaration, N_Package_Body, 398 -- or Empty if the placement of the pragma is illegal. If flag Do_Checks is 399 -- set, the routine reports duplicate pragmas. 400 401 function Find_Related_Declaration_Or_Body 402 (Prag : Node_Id; 403 Do_Checks : Boolean := False) return Node_Id; 404 -- Subsidiary to the analysis of pragmas 405 -- Contract_Cases 406 -- Depends 407 -- Extensions_Visible 408 -- Global 409 -- Initializes 410 -- Max_Entry_Queue_Depth 411 -- Max_Entry_Queue_Length 412 -- Max_Queue_Length 413 -- Post 414 -- Post_Class 415 -- Postcondition 416 -- Pre 417 -- Pre_Class 418 -- Precondition 419 -- Refined_Depends 420 -- Refined_Global 421 -- Refined_Post 422 -- Refined_State 423 -- Test_Case 424 -- Volatile_Function 425 -- as well as attributes 'Old and 'Result. Find the declaration of the 426 -- related entry, subprogram or task type [body] subject to pragma Prag. 427 -- If flag Do_Checks is set, the routine reports duplicate pragmas and 428 -- detects improper use of refinement pragmas in stand alone expression 429 -- functions. 430 431 function Get_Argument 432 (Prag : Node_Id; 433 Context_Id : Entity_Id := Empty) return Node_Id; 434 -- Obtain the argument of pragma Prag depending on context and the nature 435 -- of the pragma. The argument is extracted in the following manner: 436 -- 437 -- When the pragma is generated from an aspect, return the corresponding 438 -- aspect when Context_Id denotes a generic unit. 439 -- 440 -- Otherwise return the first argument of Prag 441 -- 442 -- Context denotes the entity of the function, package or procedure where 443 -- Prag resides. 444 445 function Get_SPARK_Mode_From_Annotation 446 (N : Node_Id) return SPARK_Mode_Type; 447 -- Given an aspect or pragma SPARK_Mode node, return corresponding mode id 448 449 procedure Initialize; 450 -- Initializes data structures used for pragma processing. Must be called 451 -- before analyzing each new main source program. 452 453 function Is_Config_Static_String (Arg : Node_Id) return Boolean; 454 -- This is called for a configuration pragma that requires either string 455 -- literal or a concatenation of string literals. We cannot use normal 456 -- static string processing because it is too early in the case of the 457 -- pragma appearing in a configuration pragmas file. If Arg is of an 458 -- appropriate form, then this call obtains the string (doing any necessary 459 -- concatenations) and places it in Name_Buffer, setting Name_Len to its 460 -- length, and then returns True. If it is not of the correct form, then an 461 -- appropriate error message is posted, and False is returned. 462 463 function Is_Elaboration_SPARK_Mode (N : Node_Id) return Boolean; 464 -- Determine whether pragma SPARK_Mode appears in the statement part of a 465 -- package body. 466 467 function Is_Enabled_Pragma (Prag : Node_Id) return Boolean; 468 -- Determine whether a Boolean-like SPARK pragma Prag is enabled. To be 469 -- considered enabled, the pragma must either: 470 -- * Appear without its Boolean expression 471 -- * The Boolean expression evaluates to "True" 472 -- 473 -- Boolean-like SPARK pragmas differ from pure Boolean Ada pragmas in that 474 -- their optional Boolean expression must be static and cannot benefit from 475 -- forward references. The following are Boolean-like SPARK pragmas: 476 -- Async_Readers 477 -- Async_Writers 478 -- Constant_After_Elaboration 479 -- Effective_Reads 480 -- Effective_Writes 481 -- Extensions_Visible 482 -- Volatile_Function 483 484 function Is_Non_Significant_Pragma_Reference (N : Node_Id) return Boolean; 485 -- The node N is a node for an entity and the issue is whether the 486 -- occurrence is a reference for the purposes of giving warnings about 487 -- unreferenced variables. This function returns True if the reference is 488 -- not a reference from this point of view (e.g. the occurrence in a pragma 489 -- Pack) and False if it is a real reference (e.g. the occurrence in a 490 -- pragma Export); 491 492 function Is_Pragma_String_Literal (Par : Node_Id) return Boolean; 493 -- Given an N_Pragma_Argument_Association node, Par, which has the form of 494 -- an operator symbol, determines whether or not it should be treated as an 495 -- string literal. This is called by Sem_Ch6.Analyze_Operator_Symbol. If 496 -- True is returned, the argument is converted to a string literal. If 497 -- False is returned, then the argument is treated as an entity reference 498 -- to the operator. 499 500 function Is_Private_SPARK_Mode (N : Node_Id) return Boolean; 501 -- Determine whether pragma SPARK_Mode appears in the private part of a 502 -- package. 503 504 function Is_Valid_Assertion_Kind (Nam : Name_Id) return Boolean; 505 -- Returns True if Nam is one of the names recognized as a valid assertion 506 -- kind by the Assertion_Policy pragma. Note that the 'Class cases are 507 -- represented by the corresponding special names Name_uPre, Name_uPost, 508 -- Name_uInvariant, and Name_uType_Invariant (_Pre, _Post, _Invariant, 509 -- and _Type_Invariant). 510 511 procedure Process_Compilation_Unit_Pragmas (N : Node_Id); 512 -- Called at the start of processing compilation unit N to deal with any 513 -- special issues regarding pragmas. In particular, we have to deal with 514 -- Suppress_All at this stage, since it can appear after the unit instead 515 -- of before (actually we allow it to appear anywhere). 516 517 procedure Relocate_Pragmas_To_Anonymous_Object 518 (Typ_Decl : Node_Id; 519 Obj_Decl : Node_Id); 520 -- Relocate all pragmas that appear in the visible declarations of task or 521 -- protected type declaration Typ_Decl after the declaration of anonymous 522 -- object Obj_Decl. Table Pragmas_On_Anonymous_Object_OK contains the list 523 -- of candidate pragmas. 524 525 procedure Relocate_Pragmas_To_Body 526 (Subp_Body : Node_Id; 527 Target_Body : Node_Id := Empty); 528 -- Resocate all pragmas that follow and apply to subprogram body Subp_Body 529 -- to its own declaration list. Candidate pragmas are classified in table 530 -- Pragma_On_Body_Or_Stub_OK. If Target_Body is set, the pragma are moved 531 -- to the declarations of Target_Body. This formal should be set when 532 -- dealing with subprogram body stubs or expression functions. 533 534 procedure Set_Encoded_Interface_Name (E : Entity_Id; S : Node_Id); 535 -- This routine is used to set an encoded interface name. The node S is 536 -- an N_String_Literal node for the external name to be set, and E is an 537 -- entity whose Interface_Name field is to be set. In the normal case where 538 -- S contains a name that is a valid C identifier, then S is simply set as 539 -- the value of the Interface_Name. Otherwise it is encoded as needed by 540 -- particular operating systems. See the body for details of the encoding. 541 542 procedure Set_Overflow_Mode (N : Node_Id); 543 -- Sets Sem.Scope_Suppress according to the overflow modes specified in 544 -- the pragma Overflow_Mode passed in argument. This should only be called 545 -- after N has been successfully analyzed. 546 547 function Test_Case_Arg 548 (Prag : Node_Id; 549 Arg_Nam : Name_Id; 550 From_Aspect : Boolean := False) return Node_Id; 551 -- Obtain argument "Name", "Mode", "Ensures" or "Requires" from Test_Case 552 -- pragma Prag as denoted by Arg_Nam. When From_Aspect is set, an attempt 553 -- is made to retrieve the argument from the corresponding aspect if there 554 -- is one. The returned argument has several formats: 555 -- 556 -- N_Pragma_Argument_Association if retrieved directly from the pragma 557 -- 558 -- N_Component_Association if retrieved from the corresponding aspect and 559 -- the argument appears in a named association form. 560 -- 561 -- An arbitrary expression if retrieved from the corresponding aspect and 562 -- the argument appears in positional form. 563 -- 564 -- Empty if there is no such argument 565 566 procedure Validate_Compile_Time_Warning_Errors; 567 -- This routine is called after calling the back end to validate pragmas 568 -- Compile_Time_Error and Compile_Time_Warning for size and alignment 569 -- appropriateness. The reason it is called that late is to take advantage 570 -- of any back-annotation of size and alignment performed by the back end. 571 572end Sem_Prag; 573