1------------------------------------------------------------------------------ 2-- -- 3-- GNAT COMPILER COMPONENTS -- 4-- -- 5-- S E M _ U T I L -- 6-- -- 7-- S p e c -- 8-- -- 9-- Copyright (C) 1992-2013, 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-- Package containing utility procedures used throughout the semantics 27 28with Einfo; use Einfo; 29with Exp_Tss; use Exp_Tss; 30with Namet; use Namet; 31with Snames; use Snames; 32with Types; use Types; 33with Uintp; use Uintp; 34with Urealp; use Urealp; 35 36package Sem_Util is 37 38 function Abstract_Interface_List (Typ : Entity_Id) return List_Id; 39 -- Given a type that implements interfaces look for its associated 40 -- definition node and return its list of interfaces. 41 42 procedure Add_Access_Type_To_Process (E : Entity_Id; A : Entity_Id); 43 -- Add A to the list of access types to process when expanding the 44 -- freeze node of E. 45 46 procedure Add_Global_Declaration (N : Node_Id); 47 -- These procedures adds a declaration N at the library level, to be 48 -- elaborated before any other code in the unit. It is used for example 49 -- for the entity that marks whether a unit has been elaborated. The 50 -- declaration is added to the Declarations list of the Aux_Decls_Node 51 -- for the current unit. The declarations are added in the current scope, 52 -- so the caller should push a new scope as required before the call. 53 54 function Addressable (V : Uint) return Boolean; 55 function Addressable (V : Int) return Boolean; 56 pragma Inline (Addressable); 57 -- Returns True if the value of V is the word size of an addressable 58 -- factor of the word size (typically 8, 16, 32 or 64). 59 60 function Alignment_In_Bits (E : Entity_Id) return Uint; 61 -- If the alignment of the type or object E is currently known to the 62 -- compiler, then this function returns the alignment value in bits. 63 -- Otherwise Uint_0 is returned, indicating that the alignment of the 64 -- entity is not yet known to the compiler. 65 66 procedure Append_Inherited_Subprogram (S : Entity_Id); 67 -- If the parent of the operation is declared in the visible part of 68 -- the current scope, the inherited operation is visible even though the 69 -- derived type that inherits the operation may be completed in the private 70 -- part of the current package. 71 72 procedure Apply_Compile_Time_Constraint_Error 73 (N : Node_Id; 74 Msg : String; 75 Reason : RT_Exception_Code; 76 Ent : Entity_Id := Empty; 77 Typ : Entity_Id := Empty; 78 Loc : Source_Ptr := No_Location; 79 Rep : Boolean := True; 80 Warn : Boolean := False); 81 -- N is a subexpression which will raise constraint error when evaluated 82 -- at runtime. Msg is a message that explains the reason for raising the 83 -- exception. The last character is ? if the message is always a warning, 84 -- even in Ada 95, and is not a ? if the message represents an illegality 85 -- (because of violation of static expression rules) in Ada 95 (but not 86 -- in Ada 83). Typically this routine posts all messages at the Sloc of 87 -- node N. However, if Loc /= No_Location, Loc is the Sloc used to output 88 -- the message. After posting the appropriate message, and if the flag 89 -- Rep is set, this routine replaces the expression with an appropriate 90 -- N_Raise_Constraint_Error node using the given Reason code. This node 91 -- is then marked as being static if the original node is static, but 92 -- sets the flag Raises_Constraint_Error, preventing further evaluation. 93 -- The error message may contain a } or & insertion character. This 94 -- normally references Etype (N), unless the Ent argument is given 95 -- explicitly, in which case it is used instead. The type of the raise 96 -- node that is built is normally Etype (N), but if the Typ parameter 97 -- is present, this is used instead. Warn is normally False. If it is 98 -- True then the message is treated as a warning even though it does 99 -- not end with a ? (this is used when the caller wants to parameterize 100 -- whether an error or warning is given. 101 102 function Available_Full_View_Of_Component (T : Entity_Id) return Boolean; 103 -- If at the point of declaration an array type has a private or limited 104 -- component, several array operations are not avaiable on the type, and 105 -- the array type is flagged accordingly. If in the immediate scope of 106 -- the array type the component becomes non-private or non-limited, these 107 -- operations become avaiable. This can happen if the scopes of both types 108 -- are open, and the scope of the array is not outside the scope of the 109 -- component. 110 111 procedure Bad_Attribute 112 (N : Node_Id; 113 Nam : Name_Id; 114 Warn : Boolean := False); 115 -- Called when node N is expected to contain a valid attribute name, and 116 -- Nam is found instead. If Warn is set True this is a warning, else this 117 -- is an error. 118 119 procedure Bad_Predicated_Subtype_Use 120 (Msg : String; 121 N : Node_Id; 122 Typ : Entity_Id); 123 -- This is called when Typ, a predicated subtype, is used in a context 124 -- which does not allow the use of a predicated subtype. Msg is passed 125 -- to Error_Msg_FE to output an appropriate message using N as the 126 -- location, and Typ as the entity. The caller must set up any insertions 127 -- other than the & for the type itself. Note that if Typ is a generic 128 -- actual type, then the message will be output as a warning, and a 129 -- raise Program_Error is inserted using Insert_Action with node N as 130 -- the insertion point. Node N also supplies the source location for 131 -- construction of the raise node. If Typ is NOT a type with predicates 132 -- this call has no effect. 133 134 function Build_Actual_Subtype 135 (T : Entity_Id; 136 N : Node_Or_Entity_Id) return Node_Id; 137 -- Build an anonymous subtype for an entity or expression, using the 138 -- bounds of the entity or the discriminants of the enclosing record. 139 -- T is the type for which the actual subtype is required, and N is either 140 -- a defining identifier, or any subexpression. 141 142 function Build_Actual_Subtype_Of_Component 143 (T : Entity_Id; 144 N : Node_Id) return Node_Id; 145 -- Determine whether a selected component has a type that depends on 146 -- discriminants, and build actual subtype for it if so. 147 148 function Build_Default_Subtype 149 (T : Entity_Id; 150 N : Node_Id) return Entity_Id; 151 -- If T is an unconstrained type with defaulted discriminants, build a 152 -- subtype constrained by the default values, insert the subtype 153 -- declaration in the tree before N, and return the entity of that 154 -- subtype. Otherwise, simply return T. 155 156 function Build_Discriminal_Subtype_Of_Component 157 (T : Entity_Id) return Node_Id; 158 -- Determine whether a record component has a type that depends on 159 -- discriminants, and build actual subtype for it if so. 160 161 procedure Build_Elaboration_Entity (N : Node_Id; Spec_Id : Entity_Id); 162 -- Given a compilation unit node N, allocate an elaboration counter for 163 -- the compilation unit, and install it in the Elaboration_Entity field 164 -- of Spec_Id, the entity for the compilation unit. 165 166 procedure Build_Explicit_Dereference 167 (Expr : Node_Id; 168 Disc : Entity_Id); 169 -- AI05-139: Names with implicit dereference. If the expression N is a 170 -- reference type and the context imposes the corresponding designated 171 -- type, convert N into N.Disc.all. Such expressions are always over- 172 -- loaded with both interpretations, and the dereference interpretation 173 -- carries the name of the reference discriminant. 174 175 function Cannot_Raise_Constraint_Error (Expr : Node_Id) return Boolean; 176 -- Returns True if the expression cannot possibly raise Constraint_Error. 177 -- The response is conservative in the sense that a result of False does 178 -- not necessarily mean that CE could be raised, but a response of True 179 -- means that for sure CE cannot be raised. 180 181 procedure Check_Function_Writable_Actuals (N : Node_Id); 182 -- (Ada 2012): If the construct N has two or more direct constituents that 183 -- are names or expressions whose evaluation may occur in an arbitrary 184 -- order, at least one of which contains a function call with an in out or 185 -- out parameter, then the construct is legal only if: for each name that 186 -- is passed as a parameter of mode in out or out to some inner function 187 -- call C2 (not including the construct N itself), there is no other name 188 -- anywhere within a direct constituent of the construct C other than 189 -- the one containing C2, that is known to refer to the same object (RM 190 -- 6.4.1(6.17/3)). 191 192 procedure Check_Implicit_Dereference (Nam : Node_Id; Typ : Entity_Id); 193 -- AI05-139-2: Accessors and iterators for containers. This procedure 194 -- checks whether T is a reference type, and if so it adds an interprettion 195 -- to Expr whose type is the designated type of the reference_discriminant. 196 197 procedure Check_Internal_Protected_Use (N : Node_Id; Nam : Entity_Id); 198 -- Within a protected function, the current object is a constant, and 199 -- internal calls to a procedure or entry are illegal. Similarly, other 200 -- uses of a protected procedure in a renaming or a generic instantiation 201 -- in the context of a protected function are illegal (AI05-0225). 202 203 procedure Check_Later_Vs_Basic_Declarations 204 (Decls : List_Id; 205 During_Parsing : Boolean); 206 -- If During_Parsing is True, check for misplacement of later vs basic 207 -- declarations in Ada 83. If During_Parsing is False, and the SPARK 208 -- restriction is set, do the same: although SPARK 95 removes the 209 -- distinction between initial and later declarative items, the distinction 210 -- remains in the Examiner (JB01-005). Note that the Examiner does not 211 -- count package declarations in later declarative items. 212 213 procedure Check_Dynamically_Tagged_Expression 214 (Expr : Node_Id; 215 Typ : Entity_Id; 216 Related_Nod : Node_Id); 217 -- Check wrong use of dynamically tagged expression 218 219 procedure Check_Fully_Declared (T : Entity_Id; N : Node_Id); 220 -- Verify that the full declaration of type T has been seen. If not, place 221 -- error message on node N. Used in object declarations, type conversions 222 -- and qualified expressions. 223 224 procedure Check_Nested_Access (Ent : Entity_Id); 225 -- Check whether Ent denotes an entity declared in an uplevel scope, which 226 -- is accessed inside a nested procedure, and set Has_Up_Level_Access flag 227 -- accordingly. This is currently only enabled for VM_Target /= No_VM. 228 229 procedure Check_Potentially_Blocking_Operation (N : Node_Id); 230 -- N is one of the statement forms that is a potentially blocking 231 -- operation. If it appears within a protected action, emit warning. 232 233 procedure Check_Unprotected_Access 234 (Context : Node_Id; 235 Expr : Node_Id); 236 -- Check whether the expression is a pointer to a protected component, 237 -- and the context is external to the protected operation, to warn against 238 -- a possible unlocked access to data. 239 240 procedure Check_VMS (Construct : Node_Id); 241 -- Check that this the target is OpenVMS, and if so, return with no effect, 242 -- otherwise post an error noting this can only be used with OpenVMS ports. 243 -- The argument is the construct in question and is used to post the error 244 -- message. 245 246 procedure Collect_Interfaces 247 (T : Entity_Id; 248 Ifaces_List : out Elist_Id; 249 Exclude_Parents : Boolean := False; 250 Use_Full_View : Boolean := True); 251 -- Ada 2005 (AI-251): Collect whole list of abstract interfaces that are 252 -- directly or indirectly implemented by T. Exclude_Parents is used to 253 -- avoid the addition of inherited interfaces to the generated list. 254 -- Use_Full_View is used to collect the interfaces using the full-view 255 -- (if available). 256 257 procedure Collect_Interface_Components 258 (Tagged_Type : Entity_Id; 259 Components_List : out Elist_Id); 260 -- Ada 2005 (AI-251): Collect all the tag components associated with the 261 -- secondary dispatch tables of a tagged type. 262 263 procedure Collect_Interfaces_Info 264 (T : Entity_Id; 265 Ifaces_List : out Elist_Id; 266 Components_List : out Elist_Id; 267 Tags_List : out Elist_Id); 268 -- Ada 2005 (AI-251): Collect all the interfaces associated with T plus 269 -- the record component and tag associated with each of these interfaces. 270 -- On exit Ifaces_List, Components_List and Tags_List have the same number 271 -- of elements, and elements at the same position on these tables provide 272 -- information on the same interface type. 273 274 procedure Collect_Parents 275 (T : Entity_Id; 276 List : out Elist_Id; 277 Use_Full_View : Boolean := True); 278 -- Collect all the parents of Typ. Use_Full_View is used to collect them 279 -- using the full-view of private parents (if available). 280 281 function Collect_Primitive_Operations (T : Entity_Id) return Elist_Id; 282 -- Called upon type derivation and extension. We scan the declarative part 283 -- in which the type appears, and collect subprograms that have one 284 -- subsidiary subtype of the type. These subprograms can only appear after 285 -- the type itself. 286 287 function Compile_Time_Constraint_Error 288 (N : Node_Id; 289 Msg : String; 290 Ent : Entity_Id := Empty; 291 Loc : Source_Ptr := No_Location; 292 Warn : Boolean := False) return Node_Id; 293 -- This is similar to Apply_Compile_Time_Constraint_Error in that it 294 -- generates a warning (or error) message in the same manner, but it does 295 -- not replace any nodes. For convenience, the function always returns its 296 -- first argument. The message is a warning if the message ends with ?, or 297 -- we are operating in Ada 83 mode, or the Warn parameter is set to True. 298 299 procedure Conditional_Delay (New_Ent, Old_Ent : Entity_Id); 300 -- Sets the Has_Delayed_Freeze flag of New if the Delayed_Freeze flag of 301 -- Old is set and Old has no yet been Frozen (i.e. Is_Frozen is false). 302 303 function Copy_Parameter_List (Subp_Id : Entity_Id) return List_Id; 304 -- Utility to create a parameter profile for a new subprogram spec, when 305 -- the subprogram has a body that acts as spec. This is done for some cases 306 -- of inlining, and for private protected ops. Also used to create bodies 307 -- for stubbed subprograms. 308 309 function Copy_Component_List 310 (R_Typ : Entity_Id; 311 Loc : Source_Ptr) return List_Id; 312 -- Copy components from record type R_Typ that come from source. Used to 313 -- create a new compatible record type. Loc is the source location assigned 314 -- to the created nodes. 315 316 function Corresponding_Generic_Type (T : Entity_Id) return Entity_Id; 317 -- If a type is a generic actual type, return the corresponding formal in 318 -- the generic parent unit. There is no direct link in the tree for this 319 -- attribute, except in the case of formal private and derived types. 320 -- Possible optimization??? 321 322 function Current_Entity (N : Node_Id) return Entity_Id; 323 pragma Inline (Current_Entity); 324 -- Find the currently visible definition for a given identifier, that is to 325 -- say the first entry in the visibility chain for the Chars of N. 326 327 function Current_Entity_In_Scope (N : Node_Id) return Entity_Id; 328 -- Find whether there is a previous definition for identifier N in the 329 -- current scope. Because declarations for a scope are not necessarily 330 -- contiguous (e.g. for packages) the first entry on the visibility chain 331 -- for N is not necessarily in the current scope. 332 333 function Current_Scope return Entity_Id; 334 -- Get entity representing current scope 335 336 function Current_Subprogram return Entity_Id; 337 -- Returns current enclosing subprogram. If Current_Scope is a subprogram, 338 -- then that is what is returned, otherwise the Enclosing_Subprogram of the 339 -- Current_Scope is returned. The returned value is Empty if this is called 340 -- from a library package which is not within any subprogram. 341 342 function Deepest_Type_Access_Level (Typ : Entity_Id) return Uint; 343 -- Same as Type_Access_Level, except that if the type is the type of an Ada 344 -- 2012 stand-alone object of an anonymous access type, then return the 345 -- static accesssibility level of the object. In that case, the dynamic 346 -- accessibility level of the object may take on values in a range. The low 347 -- bound of of that range is returned by Type_Access_Level; this function 348 -- yields the high bound of that range. Also differs from Type_Access_Level 349 -- in the case of a descendant of a generic formal type (returns Int'Last 350 -- instead of 0). 351 352 function Defining_Entity (N : Node_Id) return Entity_Id; 353 -- Given a declaration N, returns the associated defining entity. If the 354 -- declaration has a specification, the entity is obtained from the 355 -- specification. If the declaration has a defining unit name, then the 356 -- defining entity is obtained from the defining unit name ignoring any 357 -- child unit prefixes. 358 359 function Denotes_Discriminant 360 (N : Node_Id; 361 Check_Concurrent : Boolean := False) return Boolean; 362 -- Returns True if node N is an Entity_Name node for a discriminant. If the 363 -- flag Check_Concurrent is true, function also returns true when N denotes 364 -- the discriminal of the discriminant of a concurrent type. This is needed 365 -- to disable some optimizations on private components of protected types, 366 -- and constraint checks on entry families constrained by discriminants. 367 368 function Denotes_Same_Object (A1, A2 : Node_Id) return Boolean; 369 -- Detect suspicious overlapping between actuals in a call, when both are 370 -- writable (RM 2012 6.4.1(6.4/3)) 371 372 function Denotes_Same_Prefix (A1, A2 : Node_Id) return Boolean; 373 -- Functions to detect suspicious overlapping between actuals in a call, 374 -- when one of them is writable. The predicates are those proposed in 375 -- AI05-0144, to detect dangerous order dependence in complex calls. 376 -- I would add a parameter Warn which enables more extensive testing of 377 -- cases as we find appropriate when we are only warning ??? Or perhaps 378 -- return an indication of (Error, Warn, OK) ??? 379 380 function Denotes_Variable (N : Node_Id) return Boolean; 381 -- Returns True if node N denotes a single variable without parentheses 382 383 function Depends_On_Discriminant (N : Node_Id) return Boolean; 384 -- Returns True if N denotes a discriminant or if N is a range, a subtype 385 -- indication or a scalar subtype where one of the bounds is a 386 -- discriminant. 387 388 function Designate_Same_Unit 389 (Name1 : Node_Id; 390 Name2 : Node_Id) return Boolean; 391 -- Return true if Name1 and Name2 designate the same unit name; each of 392 -- these names is supposed to be a selected component name, an expanded 393 -- name, a defining program unit name or an identifier. 394 395 function Dynamic_Accessibility_Level (Expr : Node_Id) return Node_Id; 396 -- Expr should be an expression of an access type. Builds an integer 397 -- literal except in cases involving anonymous access types where 398 -- accessibility levels are tracked at runtime (access parameters and Ada 399 -- 2012 stand-alone objects). 400 401 function Effective_Extra_Accessibility (Id : Entity_Id) return Entity_Id; 402 -- Same as Einfo.Extra_Accessibility except thtat object renames 403 -- are looked through. 404 405 function Enclosing_Comp_Unit_Node (N : Node_Id) return Node_Id; 406 -- Returns the enclosing N_Compilation_Unit Node that is the root of a 407 -- subtree containing N. 408 409 function Enclosing_CPP_Parent (Typ : Entity_Id) return Entity_Id; 410 -- Returns the closest ancestor of Typ that is a CPP type. 411 412 function Enclosing_Generic_Body 413 (N : Node_Id) return Node_Id; 414 -- Returns the Node_Id associated with the innermost enclosing generic 415 -- body, if any. If none, then returns Empty. 416 417 function Enclosing_Generic_Unit 418 (N : Node_Id) return Node_Id; 419 -- Returns the Node_Id associated with the innermost enclosing generic 420 -- unit, if any. If none, then returns Empty. 421 422 function Enclosing_Lib_Unit_Entity 423 (E : Entity_Id := Current_Scope) return Entity_Id; 424 -- Returns the entity of enclosing library unit node which is the 425 -- root of the current scope (which must not be Standard_Standard, and the 426 -- caller is responsible for ensuring this condition) or other specified 427 -- entity. 428 429 function Enclosing_Package (E : Entity_Id) return Entity_Id; 430 -- Utility function to return the Ada entity of the package enclosing 431 -- the entity E, if any. Returns Empty if no enclosing package. 432 433 function Enclosing_Subprogram (E : Entity_Id) return Entity_Id; 434 -- Utility function to return the Ada entity of the subprogram enclosing 435 -- the entity E, if any. Returns Empty if no enclosing subprogram. 436 437 procedure Ensure_Freeze_Node (E : Entity_Id); 438 -- Make sure a freeze node is allocated for entity E. If necessary, build 439 -- and initialize a new freeze node and set Has_Delayed_Freeze True for E. 440 441 procedure Enter_Name (Def_Id : Entity_Id); 442 -- Insert new name in symbol table of current scope with check for 443 -- duplications (error message is issued if a conflict is found). 444 -- Note: Enter_Name is not used for overloadable entities, instead these 445 -- are entered using Sem_Ch6.Enter_Overloadable_Entity. 446 447 procedure Explain_Limited_Type (T : Entity_Id; N : Node_Id); 448 -- This procedure is called after issuing a message complaining about an 449 -- inappropriate use of limited type T. If useful, it adds additional 450 -- continuation lines to the message explaining why type T is limited. 451 -- Messages are placed at node N. 452 453 procedure Find_Actual 454 (N : Node_Id; 455 Formal : out Entity_Id; 456 Call : out Node_Id); 457 -- Determines if the node N is an actual parameter of a function of a 458 -- procedure call. If so, then Formal points to the entity for the formal 459 -- (Ekind is E_In_Parameter, E_Out_Parameter, or E_In_Out_Parameter) and 460 -- Call is set to the node for the corresponding call. If the node N is not 461 -- an actual parameter then Formal and Call are set to Empty. 462 463 function Find_Corresponding_Discriminant 464 (Id : Node_Id; 465 Typ : Entity_Id) return Entity_Id; 466 -- Because discriminants may have different names in a generic unit and in 467 -- an instance, they are resolved positionally when possible. A reference 468 -- to a discriminant carries the discriminant that it denotes when it is 469 -- analyzed. Subsequent uses of this id on a different type denotes the 470 -- discriminant at the same position in this new type. 471 472 procedure Find_Overlaid_Entity 473 (N : Node_Id; 474 Ent : out Entity_Id; 475 Off : out Boolean); 476 -- The node N should be an address representation clause. Determines if 477 -- the target expression is the address of an entity with an optional 478 -- offset. If so, set Ent to the entity and, if there is an offset, set 479 -- Off to True, otherwise to False. If N is not an address representation 480 -- clause, or if it is not possible to determine that the address is of 481 -- this form, then set Ent to Empty. 482 483 function Find_Parameter_Type (Param : Node_Id) return Entity_Id; 484 -- Return the type of formal parameter Param as determined by its 485 -- specification. 486 487 function Find_Static_Alternative (N : Node_Id) return Node_Id; 488 -- N is a case statement whose expression is a compile-time value. 489 -- Determine the alternative chosen, so that the code of non-selected 490 -- alternatives, and the warnings that may apply to them, are removed. 491 492 function Find_Body_Discriminal 493 (Spec_Discriminant : Entity_Id) return Entity_Id; 494 -- Given a discriminant of the record type that implements a task or 495 -- protected type, return the discriminal of the corresponding discriminant 496 -- of the actual concurrent type. 497 498 function First_Actual (Node : Node_Id) return Node_Id; 499 -- Node is an N_Function_Call or N_Procedure_Call_Statement node. The 500 -- result returned is the first actual parameter in declaration order 501 -- (not the order of parameters as they appeared in the source, which 502 -- can be quite different as a result of the use of named parameters). 503 -- Empty is returned for a call with no parameters. The procedure for 504 -- iterating through the actuals in declaration order is to use this 505 -- function to find the first actual, and then use Next_Actual to obtain 506 -- the next actual in declaration order. Note that the value returned 507 -- is always the expression (not the N_Parameter_Association nodes, 508 -- even if named association is used). 509 510 procedure Gather_Components 511 (Typ : Entity_Id; 512 Comp_List : Node_Id; 513 Governed_By : List_Id; 514 Into : Elist_Id; 515 Report_Errors : out Boolean); 516 -- The purpose of this procedure is to gather the valid components in a 517 -- record type according to the values of its discriminants, in order to 518 -- validate the components of a record aggregate. 519 -- 520 -- Typ is the type of the aggregate when its constrained discriminants 521 -- need to be collected, otherwise it is Empty. 522 -- 523 -- Comp_List is an N_Component_List node. 524 -- 525 -- Governed_By is a list of N_Component_Association nodes, where each 526 -- choice list contains the name of a discriminant and the expression 527 -- field gives its value. The values of the discriminants governing 528 -- the (possibly nested) variant parts in Comp_List are found in this 529 -- Component_Association List. 530 -- 531 -- Into is the list where the valid components are appended. Note that 532 -- Into need not be an Empty list. If it's not, components are attached 533 -- to its tail. 534 -- 535 -- Report_Errors is set to True if the values of the discriminants are 536 -- non-static. 537 -- 538 -- This procedure is also used when building a record subtype. If the 539 -- discriminant constraint of the subtype is static, the components of the 540 -- subtype are only those of the variants selected by the values of the 541 -- discriminants. Otherwise all components of the parent must be included 542 -- in the subtype for semantic analysis. 543 544 function Get_Actual_Subtype (N : Node_Id) return Entity_Id; 545 -- Given a node for an expression, obtain the actual subtype of the 546 -- expression. In the case of a parameter where the formal is an 547 -- unconstrained array or discriminated type, this will be the previously 548 -- constructed subtype of the actual. Note that this is not quite the 549 -- "Actual Subtype" of the RM, since it is always a constrained type, i.e. 550 -- it is the subtype of the value of the actual. The actual subtype is also 551 -- returned in other cases where it has already been constructed for an 552 -- object. Otherwise the expression type is returned unchanged, except for 553 -- the case of an unconstrained array type, where an actual subtype is 554 -- created, using Insert_Actions if necessary to insert any associated 555 -- actions. 556 557 function Get_Actual_Subtype_If_Available (N : Node_Id) return Entity_Id; 558 -- This is like Get_Actual_Subtype, except that it never constructs an 559 -- actual subtype. If an actual subtype is already available, i.e. the 560 -- Actual_Subtype field of the corresponding entity is set, then it is 561 -- returned. Otherwise the Etype of the node is returned. 562 563 function Get_Body_From_Stub (N : Node_Id) return Node_Id; 564 -- Return the body node for a stub (subprogram or package) 565 566 function Get_Default_External_Name (E : Node_Or_Entity_Id) return Node_Id; 567 -- This is used to construct the string literal node representing a 568 -- default external name, i.e. one that is constructed from the name of an 569 -- entity, or (in the case of extended DEC import/export pragmas, an 570 -- identifier provided as the external name. Letters in the name are 571 -- according to the setting of Opt.External_Name_Default_Casing. 572 573 function Get_Enclosing_Object (N : Node_Id) return Entity_Id; 574 -- If expression N references a part of an object, return this object. 575 -- Otherwise return Empty. Expression N should have been resolved already. 576 577 function Get_Ensures_From_CTC_Pragma (N : Node_Id) return Node_Id; 578 -- Return the Ensures component of Contract_Case or Test_Case pragma N, or 579 -- Empty otherwise. 580 581 function Get_Generic_Entity (N : Node_Id) return Entity_Id; 582 -- Returns the true generic entity in an instantiation. If the name in the 583 -- instantiation is a renaming, the function returns the renamed generic. 584 585 procedure Get_Index_Bounds (N : Node_Id; L, H : out Node_Id); 586 -- This procedure assigns to L and H respectively the values of the low and 587 -- high bounds of node N, which must be a range, subtype indication, or the 588 -- name of a scalar subtype. The result in L, H may be set to Error if 589 -- there was an earlier error in the range. 590 591 function Get_Enum_Lit_From_Pos 592 (T : Entity_Id; 593 Pos : Uint; 594 Loc : Source_Ptr) return Node_Id; 595 -- This function returns an identifier denoting the E_Enumeration_Literal 596 -- entity for the specified value from the enumeration type or subtype T. 597 -- The second argument is the Pos value, which is assumed to be in range. 598 -- The third argument supplies a source location for constructed nodes 599 -- returned by this function. 600 601 procedure Get_Library_Unit_Name_String (Decl_Node : Node_Id); 602 -- Retrieve the fully expanded name of the library unit declared by 603 -- Decl_Node into the name buffer. 604 605 function Get_Name_Entity_Id (Id : Name_Id) return Entity_Id; 606 pragma Inline (Get_Name_Entity_Id); 607 -- An entity value is associated with each name in the name table. The 608 -- Get_Name_Entity_Id function fetches the Entity_Id of this entity, which 609 -- is the innermost visible entity with the given name. See the body of 610 -- Sem_Ch8 for further details on handling of entity visibility. 611 612 function Get_Name_From_CTC_Pragma (N : Node_Id) return String_Id; 613 -- Return the Name component of Contract_Case or Test_Case pragma N 614 615 function Get_Pragma_Id (N : Node_Id) return Pragma_Id; 616 pragma Inline (Get_Pragma_Id); 617 -- Obtains the Pragma_Id from the Chars field of Pragma_Identifier (N) 618 619 function Get_Referenced_Object (N : Node_Id) return Node_Id; 620 -- Given a node, return the renamed object if the node represents a renamed 621 -- object, otherwise return the node unchanged. The node may represent an 622 -- arbitrary expression. 623 624 function Get_Renamed_Entity (E : Entity_Id) return Entity_Id; 625 -- Given an entity for an exception, package, subprogram or generic unit, 626 -- returns the ultimately renamed entity if this is a renaming. If this is 627 -- not a renamed entity, returns its argument. It is an error to call this 628 -- with any other kind of entity. 629 630 function Get_Requires_From_CTC_Pragma (N : Node_Id) return Node_Id; 631 -- Return the Requires component of Contract_Case or Test_Case pragma N, or 632 -- Empty otherwise. 633 634 function Get_Subprogram_Entity (Nod : Node_Id) return Entity_Id; 635 -- Nod is either a procedure call statement, or a function call, or an 636 -- accept statement node. This procedure finds the Entity_Id of the related 637 -- subprogram or entry and returns it, or if no subprogram can be found, 638 -- returns Empty. 639 640 function Get_Subprogram_Body (E : Entity_Id) return Node_Id; 641 -- Given the entity for a subprogram (E_Function or E_Procedure), return 642 -- the corresponding N_Subprogram_Body node. If the corresponding body 643 -- is missing (as for an imported subprogram), return Empty. 644 645 function Get_Task_Body_Procedure (E : Entity_Id) return Node_Id; 646 pragma Inline (Get_Task_Body_Procedure); 647 -- Given an entity for a task type or subtype, retrieves the 648 -- Task_Body_Procedure field from the corresponding task type declaration. 649 650 function Has_Access_Values (T : Entity_Id) return Boolean; 651 -- Returns true if type or subtype T is an access type, or has a component 652 -- (at any recursive level) that is an access type. This is a conservative 653 -- predicate, if it is not known whether or not T contains access values 654 -- (happens for generic formals in some cases), then False is returned. 655 -- Note that tagged types return False. Even though the tag is implemented 656 -- as an access type internally, this function tests only for access types 657 -- known to the programmer. See also Has_Tagged_Component. 658 659 type Alignment_Result is (Known_Compatible, Unknown, Known_Incompatible); 660 -- Result of Has_Compatible_Alignment test, description found below. Note 661 -- that the values are arranged in increasing order of problematicness. 662 663 function Has_Compatible_Alignment 664 (Obj : Entity_Id; 665 Expr : Node_Id) return Alignment_Result; 666 -- Obj is an object entity, and expr is a node for an object reference. If 667 -- the alignment of the object referenced by Expr is known to be compatible 668 -- with the alignment of Obj (i.e. is larger or the same), then the result 669 -- is Known_Compatible. If the alignment of the object referenced by Expr 670 -- is known to be less than the alignment of Obj, then Known_Incompatible 671 -- is returned. If neither condition can be reliably established at compile 672 -- time, then Unknown is returned. This is used to determine if alignment 673 -- checks are required for address clauses, and also whether copies must 674 -- be made when objects are passed by reference. 675 -- 676 -- Note: Known_Incompatible does not mean that at run time the alignment 677 -- of Expr is known to be wrong for Obj, just that it can be determined 678 -- that alignments have been explicitly or implicitly specified which are 679 -- incompatible (whereas Unknown means that even this is not known). The 680 -- appropriate reaction of a caller to Known_Incompatible is to treat it as 681 -- Unknown, but issue a warning that there may be an alignment error. 682 683 function Has_Declarations (N : Node_Id) return Boolean; 684 -- Determines if the node can have declarations 685 686 function Has_Denormals (E : Entity_Id) return Boolean; 687 -- Determines if the floating-point type E supports denormal numbers. 688 -- Returns False if E is not a floating-point type. 689 690 function Has_Discriminant_Dependent_Constraint 691 (Comp : Entity_Id) return Boolean; 692 -- Returns True if and only if Comp has a constrained subtype that depends 693 -- on a discriminant. 694 695 function Has_Infinities (E : Entity_Id) return Boolean; 696 -- Determines if the range of the floating-point type E includes 697 -- infinities. Returns False if E is not a floating-point type. 698 699 function Has_Interfaces 700 (T : Entity_Id; 701 Use_Full_View : Boolean := True) return Boolean; 702 -- Where T is a concurrent type or a record type, returns true if T covers 703 -- any abstract interface types. In case of private types the argument 704 -- Use_Full_View controls if the check is done using its full view (if 705 -- available). 706 707 function Has_Null_Exclusion (N : Node_Id) return Boolean; 708 -- Determine whether node N has a null exclusion 709 710 function Has_Overriding_Initialize (T : Entity_Id) return Boolean; 711 -- Predicate to determine whether a controlled type has a user-defined 712 -- Initialize primitive (and, in Ada 2012, whether that primitive is 713 -- non-null), which causes the type to not have preelaborable 714 -- initialization. 715 716 function Has_Preelaborable_Initialization (E : Entity_Id) return Boolean; 717 -- Return True iff type E has preelaborable initialization as defined in 718 -- Ada 2005 (see AI-161 for details of the definition of this attribute). 719 720 function Has_Private_Component (Type_Id : Entity_Id) return Boolean; 721 -- Check if a type has a (sub)component of a private type that has not 722 -- yet received a full declaration. 723 724 function Has_Signed_Zeros (E : Entity_Id) return Boolean; 725 -- Determines if the floating-point type E supports signed zeros. 726 -- Returns False if E is not a floating-point type. 727 728 function Has_Static_Array_Bounds (Typ : Node_Id) return Boolean; 729 -- Return whether an array type has static bounds 730 731 function Has_Stream (T : Entity_Id) return Boolean; 732 -- Tests if type T is derived from Ada.Streams.Root_Stream_Type, or in the 733 -- case of a composite type, has a component for which this predicate is 734 -- True, and if so returns True. Otherwise a result of False means that 735 -- there is no Stream type in sight. For a private type, the test is 736 -- applied to the underlying type (or returns False if there is no 737 -- underlying type). 738 739 function Has_Suffix (E : Entity_Id; Suffix : Character) return Boolean; 740 -- Returns true if the last character of E is Suffix. Used in Assertions. 741 742 function Add_Suffix (E : Entity_Id; Suffix : Character) return Name_Id; 743 -- Returns the name of E adding Suffix 744 745 function Remove_Suffix (E : Entity_Id; Suffix : Character) return Name_Id; 746 -- Returns the name of E without Suffix 747 748 function Has_Tagged_Component (Typ : Entity_Id) return Boolean; 749 -- Returns True if Typ is a composite type (array or record) which is 750 -- either itself a tagged type, or has a component (recursively) which is 751 -- a tagged type. Returns False for non-composite type, or if no tagged 752 -- component is present. This function is used to check if "=" has to be 753 -- expanded into a bunch component comparisons. 754 755 function Implementation_Kind (Subp : Entity_Id) return Name_Id; 756 -- Subp is a subprogram marked with pragma Implemented. Return the specific 757 -- implementation requirement which the pragma imposes. The return value is 758 -- either Name_By_Any, Name_By_Entry or Name_By_Protected_Procedure. 759 760 function Implements_Interface 761 (Typ_Ent : Entity_Id; 762 Iface_Ent : Entity_Id; 763 Exclude_Parents : Boolean := False) return Boolean; 764 -- Returns true if the Typ_Ent implements interface Iface_Ent 765 766 function In_Instance return Boolean; 767 -- Returns True if the current scope is within a generic instance 768 769 function In_Instance_Body return Boolean; 770 -- Returns True if current scope is within the body of an instance, where 771 -- several semantic checks (e.g. accessibility checks) are relaxed. 772 773 function In_Instance_Not_Visible return Boolean; 774 -- Returns True if current scope is with the private part or the body of 775 -- an instance. Other semantic checks are suppressed in this context. 776 777 function In_Instance_Visible_Part return Boolean; 778 -- Returns True if current scope is within the visible part of a package 779 -- instance, where several additional semantic checks apply. 780 781 function In_Package_Body return Boolean; 782 -- Returns True if current scope is within a package body 783 784 function In_Parameter_Specification (N : Node_Id) return Boolean; 785 -- Returns True if node N belongs to a parameter specification 786 787 function In_Reverse_Storage_Order_Object (N : Node_Id) return Boolean; 788 -- Returns True if N denotes a component or subcomponent in a record or 789 -- array that has Reverse_Storage_Order. 790 791 function In_Subprogram_Or_Concurrent_Unit return Boolean; 792 -- Determines if the current scope is within a subprogram compilation unit 793 -- (inside a subprogram declaration, subprogram body, or generic 794 -- subprogram declaration) or within a task or protected body. The test is 795 -- for appearing anywhere within such a construct (that is it does not need 796 -- to be directly within). 797 798 function In_Visible_Part (Scope_Id : Entity_Id) return Boolean; 799 -- Determine whether a declaration occurs within the visible part of a 800 -- package specification. The package must be on the scope stack, and the 801 -- corresponding private part must not. 802 803 function Incomplete_Or_Private_View (Typ : Entity_Id) return Entity_Id; 804 -- Given the entity of a type, retrieve the incomplete or private view of 805 -- the same type. Note that Typ may not have a partial view to begin with, 806 -- in that case the function returns Empty. 807 808 procedure Insert_Explicit_Dereference (N : Node_Id); 809 -- In a context that requires a composite or subprogram type and where a 810 -- prefix is an access type, rewrite the access type node N (which is the 811 -- prefix, e.g. of an indexed component) as an explicit dereference. 812 813 procedure Inspect_Deferred_Constant_Completion (Decls : List_Id); 814 -- Examine all deferred constants in the declaration list Decls and check 815 -- whether they have been completed by a full constant declaration or an 816 -- Import pragma. Emit the error message if that is not the case. 817 818 function Is_Actual_Out_Parameter (N : Node_Id) return Boolean; 819 -- Determines if N is an actual parameter of out mode in a subprogram call 820 821 function Is_Actual_Parameter (N : Node_Id) return Boolean; 822 -- Determines if N is an actual parameter in a subprogram call 823 824 function Is_Actual_Tagged_Parameter (N : Node_Id) return Boolean; 825 -- Determines if N is an actual parameter of a formal of tagged type in a 826 -- subprogram call. 827 828 function Is_Aliased_View (Obj : Node_Id) return Boolean; 829 -- Determine if Obj is an aliased view, i.e. the name of an object to which 830 -- 'Access or 'Unchecked_Access can apply. Note that this routine uses the 831 -- rules of the language, it does not take into account the restriction 832 -- No_Implicit_Aliasing, so it can return True if the restriction is active 833 -- and Obj violates the restriction. The caller is responsible for calling 834 -- Restrict.Check_No_Implicit_Aliasing if True is returned, but there is a 835 -- requirement for obeying the restriction in the call context. 836 837 function Is_Ancestor_Package 838 (E1 : Entity_Id; 839 E2 : Entity_Id) return Boolean; 840 -- Determine whether package E1 is an ancestor of E2 841 842 function Is_Atomic_Object (N : Node_Id) return Boolean; 843 -- Determines if the given node denotes an atomic object in the sense of 844 -- the legality checks described in RM C.6(12). 845 846 function Is_Bounded_String (T : Entity_Id) return Boolean; 847 -- True if T is a bounded string type. Used to make sure "=" composes 848 -- properly for bounded string types. 849 850 function Is_Controlling_Limited_Procedure 851 (Proc_Nam : Entity_Id) return Boolean; 852 -- Ada 2005 (AI-345): Determine whether Proc_Nam is a primitive procedure 853 -- of a limited interface with a controlling first parameter. 854 855 function Is_CPP_Constructor_Call (N : Node_Id) return Boolean; 856 -- Returns True if N is a call to a CPP constructor 857 858 function Is_Dependent_Component_Of_Mutable_Object 859 (Object : Node_Id) return Boolean; 860 -- Returns True if Object is the name of a subcomponent that depends on 861 -- discriminants of a variable whose nominal subtype is unconstrained and 862 -- not indefinite, and the variable is not aliased. Otherwise returns 863 -- False. The nodes passed to this function are assumed to denote objects. 864 865 function Is_Dereferenced (N : Node_Id) return Boolean; 866 -- N is a subexpression node of an access type. This function returns true 867 -- if N appears as the prefix of a node that does a dereference of the 868 -- access value (selected/indexed component, explicit dereference or a 869 -- slice), and false otherwise. 870 871 function Is_Descendent_Of (T1 : Entity_Id; T2 : Entity_Id) return Boolean; 872 -- Returns True if type T1 is a descendent of type T2, and false otherwise. 873 -- This is the RM definition, a type is a descendent of another type if it 874 -- is the same type or is derived from a descendent of the other type. 875 876 function Is_Concurrent_Interface (T : Entity_Id) return Boolean; 877 -- First determine whether type T is an interface and then check whether 878 -- it is of protected, synchronized or task kind. 879 880 function Is_Expression_Function (Subp : Entity_Id) return Boolean; 881 -- Predicate to determine whether a function entity comes from a rewritten 882 -- expression function, and should be inlined unconditionally. 883 884 function Is_False (U : Uint) return Boolean; 885 pragma Inline (Is_False); 886 -- The argument is a Uint value which is the Boolean'Pos value of a Boolean 887 -- operand (i.e. is either 0 for False, or 1 for True). This function tests 888 -- if it is False (i.e. zero). 889 890 function Is_Fixed_Model_Number (U : Ureal; T : Entity_Id) return Boolean; 891 -- Returns True iff the number U is a model number of the fixed-point type 892 -- T, i.e. if it is an exact multiple of Small. 893 894 function Is_Fully_Initialized_Type (Typ : Entity_Id) return Boolean; 895 -- Typ is a type entity. This function returns true if this type is fully 896 -- initialized, meaning that an object of the type is fully initialized. 897 -- Note that initialization resulting from use of pragma Normalized_Scalars 898 -- does not count. Note that this is only used for the purpose of issuing 899 -- warnings for objects that are potentially referenced uninitialized. This 900 -- means that the result returned is not crucial, but should err on the 901 -- side of thinking things are fully initialized if it does not know. 902 903 function Is_Inherited_Operation (E : Entity_Id) return Boolean; 904 -- E is a subprogram. Return True is E is an implicit operation inherited 905 -- by a derived type declaration. 906 907 function Is_Inherited_Operation_For_Type 908 (E : Entity_Id; 909 Typ : Entity_Id) return Boolean; 910 -- E is a subprogram. Return True is E is an implicit operation inherited 911 -- by the derived type declaration for type Typ. 912 913 function Is_Iterator (Typ : Entity_Id) return Boolean; 914 -- AI05-0139-2: Check whether Typ is one of the predefined interfaces in 915 -- Ada.Iterator_Interfaces, or it is derived from one. 916 917 function Is_LHS (N : Node_Id) return Boolean; 918 -- Returns True iff N is used as Name in an assignment statement 919 920 function Is_Library_Level_Entity (E : Entity_Id) return Boolean; 921 -- A library-level declaration is one that is accessible from Standard, 922 -- i.e. a library unit or an entity declared in a library package. 923 924 function Is_Limited_Class_Wide_Type (Typ : Entity_Id) return Boolean; 925 -- Determine whether a given arbitrary type is a limited class-wide type 926 927 function Is_Local_Variable_Reference (Expr : Node_Id) return Boolean; 928 -- Determines whether Expr is a reference to a variable or IN OUT mode 929 -- parameter of the current enclosing subprogram. 930 -- Why are OUT parameters not considered here ??? 931 932 function Is_Object_Reference (N : Node_Id) return Boolean; 933 -- Determines if the tree referenced by N represents an object. Both 934 -- variable and constant objects return True (compare Is_Variable). 935 936 function Is_OK_Variable_For_Out_Formal (AV : Node_Id) return Boolean; 937 -- Used to test if AV is an acceptable formal for an OUT or IN OUT formal. 938 -- Note that the Is_Variable function is not quite the right test because 939 -- this is a case in which conversions whose expression is a variable (in 940 -- the Is_Variable sense) with a non-tagged type target are considered view 941 -- conversions and hence variables. 942 943 function Is_Partially_Initialized_Type 944 (Typ : Entity_Id; 945 Include_Implicit : Boolean := True) return Boolean; 946 -- Typ is a type entity. This function returns true if this type is partly 947 -- initialized, meaning that an object of the type is at least partly 948 -- initialized (in particular in the record case, that at least one 949 -- component has an initialization expression). Note that initialization 950 -- resulting from the use of pragma Normalized_Scalars does not count. 951 -- Include_Implicit controls whether implicit initialization of access 952 -- values to null, and of discriminant values, is counted as making the 953 -- type be partially initialized. For the default setting of True, these 954 -- implicit cases do count, and discriminated types or types containing 955 -- access values not explicitly initialized will return True. Otherwise 956 -- if Include_Implicit is False, these cases do not count as making the 957 -- type be partially initialized. 958 959 function Is_Potentially_Persistent_Type (T : Entity_Id) return Boolean; 960 -- Determines if type T is a potentially persistent type. A potentially 961 -- persistent type is defined (recursively) as a scalar type, a non-tagged 962 -- record whose components are all of a potentially persistent type, or an 963 -- array with all static constraints whose component type is potentially 964 -- persistent. A private type is potentially persistent if the full type 965 -- is potentially persistent. 966 967 function Is_Protected_Self_Reference (N : Node_Id) return Boolean; 968 -- Return True if node N denotes a protected type name which represents 969 -- the current instance of a protected object according to RM 9.4(21/2). 970 971 function Is_RCI_Pkg_Spec_Or_Body (Cunit : Node_Id) return Boolean; 972 -- Return True if a compilation unit is the specification or the 973 -- body of a remote call interface package. 974 975 function Is_Remote_Access_To_Class_Wide_Type (E : Entity_Id) return Boolean; 976 -- Return True if E is a remote access-to-class-wide type 977 978 function Is_Remote_Access_To_Subprogram_Type (E : Entity_Id) return Boolean; 979 -- Return True if E is a remote access to subprogram type 980 981 function Is_Remote_Call (N : Node_Id) return Boolean; 982 -- Return True if N denotes a potentially remote call 983 984 function Is_Renamed_Entry (Proc_Nam : Entity_Id) return Boolean; 985 -- Return True if Proc_Nam is a procedure renaming of an entry 986 987 function Is_Reversible_Iterator (Typ : Entity_Id) return Boolean; 988 -- AI05-0139-2: Check whether Typ is derived from the predefined interface 989 -- Ada.Iterator_Interfaces.Reversible_Iterator. 990 991 function Is_Selector_Name (N : Node_Id) return Boolean; 992 -- Given an N_Identifier node N, determines if it is a Selector_Name. 993 -- As described in Sinfo, Selector_Names are special because they 994 -- represent use of the N_Identifier node for a true identifier, when 995 -- normally such nodes represent a direct name. 996 997 function Is_SPARK_Initialization_Expr (N : Node_Id) return Boolean; 998 -- Determines if the tree referenced by N represents an initialization 999 -- expression in SPARK, suitable for initializing an object in an object 1000 -- declaration. 1001 1002 function Is_SPARK_Object_Reference (N : Node_Id) return Boolean; 1003 -- Determines if the tree referenced by N represents an object in SPARK 1004 1005 function Is_Statement (N : Node_Id) return Boolean; 1006 pragma Inline (Is_Statement); 1007 -- Check if the node N is a statement node. Note that this includes 1008 -- the case of procedure call statements (unlike the direct use of 1009 -- the N_Statement_Other_Than_Procedure_Call subtype from Sinfo). 1010 -- Note that a label is *not* a statement, and will return False. 1011 1012 function Is_Subprogram_Stub_Without_Prior_Declaration 1013 (N : Node_Id) return Boolean; 1014 -- Return True if N is a subprogram stub with no prior subprogram 1015 -- declaration. 1016 1017 function Is_Synchronized_Tagged_Type (E : Entity_Id) return Boolean; 1018 -- Returns True if E is a synchronized tagged type (AARM 3.9.4 (6/2)) 1019 1020 function Is_Transfer (N : Node_Id) return Boolean; 1021 -- Returns True if the node N is a statement which is known to cause an 1022 -- unconditional transfer of control at runtime, i.e. the following 1023 -- statement definitely will not be executed. 1024 1025 function Is_True (U : Uint) return Boolean; 1026 pragma Inline (Is_True); 1027 -- The argument is a Uint value which is the Boolean'Pos value of a Boolean 1028 -- operand (i.e. is either 0 for False, or 1 for True). This function tests 1029 -- if it is True (i.e. non-zero). 1030 1031 function Is_Universal_Numeric_Type (T : Entity_Id) return Boolean; 1032 pragma Inline (Is_Universal_Numeric_Type); 1033 -- True if T is Universal_Integer or Universal_Real 1034 1035 function Is_Value_Type (T : Entity_Id) return Boolean; 1036 -- Returns true if type T represents a value type. This is only relevant to 1037 -- CIL, will always return false for other targets. A value type is a CIL 1038 -- object that is accessed directly, as opposed to the other CIL objects 1039 -- that are accessed through managed pointers. 1040 1041 function Is_VMS_Operator (Op : Entity_Id) return Boolean; 1042 -- Determine whether an operator is one of the intrinsics defined 1043 -- in the DEC system extension. 1044 1045 function Is_Delegate (T : Entity_Id) return Boolean; 1046 -- Returns true if type T represents a delegate. A Delegate is the CIL 1047 -- object used to represent access-to-subprogram types. This is only 1048 -- relevant to CIL, will always return false for other targets. 1049 1050 function Is_Variable 1051 (N : Node_Id; 1052 Use_Original_Node : Boolean := True) return Boolean; 1053 -- Determines if the tree referenced by N represents a variable, i.e. can 1054 -- appear on the left side of an assignment. There is one situation (formal 1055 -- parameters) in which non-tagged type conversions are also considered 1056 -- variables, but Is_Variable returns False for such cases, since it has 1057 -- no knowledge of the context. Note that this is the point at which 1058 -- Assignment_OK is checked, and True is returned for any tree thus marked. 1059 -- Use_Original_Node is used to perform the test on Original_Node (N). By 1060 -- default is True since this routine is commonly invoked as part of the 1061 -- semantic analysis and it must not be disturbed by the rewriten nodes. 1062 1063 function Is_Visibly_Controlled (T : Entity_Id) return Boolean; 1064 -- Check whether T is derived from a visibly controlled type. This is true 1065 -- if the root type is declared in Ada.Finalization. If T is derived 1066 -- instead from a private type whose full view is controlled, an explicit 1067 -- Initialize/Adjust/Finalize subprogram does not override the inherited 1068 -- one. 1069 1070 function Is_Volatile_Object (N : Node_Id) return Boolean; 1071 -- Determines if the given node denotes an volatile object in the sense of 1072 -- the legality checks described in RM C.6(12). Note that the test here is 1073 -- for something actually declared as volatile, not for an object that gets 1074 -- treated as volatile (see Einfo.Treat_As_Volatile). 1075 1076 function Itype_Has_Declaration (Id : Entity_Id) return Boolean; 1077 -- Applies to Itypes. True if the Itype is attached to a declaration for 1078 -- the type through its Parent field, which may or not be present in the 1079 -- tree. 1080 1081 procedure Kill_Current_Values (Last_Assignment_Only : Boolean := False); 1082 -- This procedure is called to clear all constant indications from all 1083 -- entities in the current scope and in any parent scopes if the current 1084 -- scope is a block or a package (and that recursion continues to the top 1085 -- scope that is not a block or a package). This is used when the 1086 -- sequential flow-of-control assumption is violated (occurrence of a 1087 -- label, head of a loop, or start of an exception handler). The effect of 1088 -- the call is to clear the Current_Value field (but we do not need to 1089 -- clear the Is_True_Constant flag, since that only gets reset if there 1090 -- really is an assignment somewhere in the entity scope). This procedure 1091 -- also calls Kill_All_Checks, since this is a special case of needing to 1092 -- forget saved values. This procedure also clears the Is_Known_Null and 1093 -- Is_Known_Non_Null and Is_Known_Valid flags in variables, constants or 1094 -- parameters since these are also not known to be trustable any more. 1095 -- 1096 -- The Last_Assignment_Only flag is set True to clear only Last_Assignment 1097 -- fields and leave other fields unchanged. This is used when we encounter 1098 -- an unconditional flow of control change (return, goto, raise). In such 1099 -- cases we don't need to clear the current values, since it may be that 1100 -- the flow of control change occurs in a conditional context, and if it 1101 -- is not taken, then it is just fine to keep the current values. But the 1102 -- Last_Assignment field is different, if we have a sequence assign-to-v, 1103 -- conditional-return, assign-to-v, we do not want to complain that the 1104 -- second assignment clobbers the first. 1105 1106 procedure Kill_Current_Values 1107 (Ent : Entity_Id; 1108 Last_Assignment_Only : Boolean := False); 1109 -- This performs the same processing as described above for the form with 1110 -- no argument, but for the specific entity given. The call has no effect 1111 -- if the entity Ent is not for an object. Last_Assignment_Only has the 1112 -- same meaning as for the call with no Ent. 1113 1114 procedure Kill_Size_Check_Code (E : Entity_Id); 1115 -- Called when an address clause or pragma Import is applied to an entity. 1116 -- If the entity is a variable or a constant, and size check code is 1117 -- present, this size check code is killed, since the object will not be 1118 -- allocated by the program. 1119 1120 function Known_To_Be_Assigned (N : Node_Id) return Boolean; 1121 -- The node N is an entity reference. This function determines whether the 1122 -- reference is for sure an assignment of the entity, returning True if 1123 -- so. This differs from May_Be_Lvalue in that it defaults in the other 1124 -- direction. Cases which may possibly be assignments but are not known to 1125 -- be may return True from May_Be_Lvalue, but False from this function. 1126 1127 function Last_Source_Statement (HSS : Node_Id) return Node_Id; 1128 -- HSS is a handled statement sequence. This function returns the last 1129 -- statement in Statements (HSS) that has Comes_From_Source set. If no 1130 -- such statement exists, Empty is returned. 1131 1132 function Matching_Static_Array_Bounds 1133 (L_Typ : Node_Id; 1134 R_Typ : Node_Id) return Boolean; 1135 -- L_Typ and R_Typ are two array types. Returns True when they have the 1136 -- same number of dimensions, and the same static bounds for each index 1137 -- position. 1138 1139 procedure Mark_Coextensions (Context_Nod : Node_Id; Root_Nod : Node_Id); 1140 -- Given a node which designates the context of analysis and an origin in 1141 -- the tree, traverse from Root_Nod and mark all allocators as either 1142 -- dynamic or static depending on Context_Nod. Any erroneous marking is 1143 -- cleaned up during resolution. 1144 1145 function May_Be_Lvalue (N : Node_Id) return Boolean; 1146 -- Determines if N could be an lvalue (e.g. an assignment left hand side). 1147 -- An lvalue is defined as any expression which appears in a context where 1148 -- a name is required by the syntax, and the identity, rather than merely 1149 -- the value of the node is needed (for example, the prefix of an Access 1150 -- attribute is in this category). Note that, as implied by the name, this 1151 -- test is conservative. If it cannot be sure that N is NOT an lvalue, then 1152 -- it returns True. It tries hard to get the answer right, but it is hard 1153 -- to guarantee this in all cases. Note that it is more possible to give 1154 -- correct answer if the tree is fully analyzed. 1155 1156 function Must_Inline (Subp : Entity_Id) return Boolean; 1157 -- Return true if Subp must be inlined by the frontend 1158 1159 function Needs_One_Actual (E : Entity_Id) return Boolean; 1160 -- Returns True if a function has defaults for all but its first 1161 -- formal. Used in Ada 2005 mode to solve the syntactic ambiguity that 1162 -- results from an indexing of a function call written in prefix form. 1163 1164 function New_Copy_List_Tree (List : List_Id) return List_Id; 1165 -- Copy recursively an analyzed list of nodes. Uses New_Copy_Tree defined 1166 -- below. As for New_Copy_Tree, it is illegal to attempt to copy extended 1167 -- nodes (entities) either directly or indirectly using this function. 1168 1169 function New_Copy_Tree 1170 (Source : Node_Id; 1171 Map : Elist_Id := No_Elist; 1172 New_Sloc : Source_Ptr := No_Location; 1173 New_Scope : Entity_Id := Empty) return Node_Id; 1174 -- Given a node that is the root of a subtree, Copy_Tree copies the entire 1175 -- syntactic subtree, including recursively any descendents whose parent 1176 -- field references a copied node (descendents not linked to a copied node 1177 -- by the parent field are not copied, instead the copied tree references 1178 -- the same descendent as the original in this case, which is appropriate 1179 -- for non-syntactic fields such as Etype). The parent pointers in the 1180 -- copy are properly set. Copy_Tree (Empty/Error) returns Empty/Error. 1181 -- The one exception to the rule of not copying semantic fields is that 1182 -- any implicit types attached to the subtree are duplicated, so that 1183 -- the copy contains a distinct set of implicit type entities. Thus this 1184 -- function is used when it is necessary to duplicate an analyzed tree, 1185 -- declared in the same or some other compilation unit. This function is 1186 -- declared here rather than in atree because it uses semantic information 1187 -- in particular concerning the structure of itypes and the generation of 1188 -- public symbols. 1189 1190 -- The Map argument, if set to a non-empty Elist, specifies a set of 1191 -- mappings to be applied to entities in the tree. The map has the form: 1192 -- 1193 -- old entity 1 1194 -- new entity to replace references to entity 1 1195 -- old entity 2 1196 -- new entity to replace references to entity 2 1197 -- ... 1198 -- 1199 -- The call destroys the contents of Map in this case 1200 -- 1201 -- The parameter New_Sloc, if set to a value other than No_Location, is 1202 -- used as the Sloc value for all nodes in the new copy. If New_Sloc is 1203 -- set to its default value No_Location, then the Sloc values of the 1204 -- nodes in the copy are simply copied from the corresponding original. 1205 -- 1206 -- The Comes_From_Source indication is unchanged if New_Sloc is set to 1207 -- the default No_Location value, but is reset if New_Sloc is given, since 1208 -- in this case the result clearly is neither a source node or an exact 1209 -- copy of a source node. 1210 -- 1211 -- The parameter New_Scope, if set to a value other than Empty, is the 1212 -- value to use as the Scope for any Itypes that are copied. The most 1213 -- typical value for this parameter, if given, is Current_Scope. 1214 1215 function New_External_Entity 1216 (Kind : Entity_Kind; 1217 Scope_Id : Entity_Id; 1218 Sloc_Value : Source_Ptr; 1219 Related_Id : Entity_Id; 1220 Suffix : Character; 1221 Suffix_Index : Nat := 0; 1222 Prefix : Character := ' ') return Entity_Id; 1223 -- This function creates an N_Defining_Identifier node for an internal 1224 -- created entity, such as an implicit type or subtype, or a record 1225 -- initialization procedure. The entity name is constructed with a call 1226 -- to New_External_Name (Related_Id, Suffix, Suffix_Index, Prefix), so 1227 -- that the generated name may be referenced as a public entry, and the 1228 -- Is_Public flag is set if needed (using Set_Public_Status). If the 1229 -- entity is for a type or subtype, the size/align fields are initialized 1230 -- to unknown (Uint_0). 1231 1232 function New_Internal_Entity 1233 (Kind : Entity_Kind; 1234 Scope_Id : Entity_Id; 1235 Sloc_Value : Source_Ptr; 1236 Id_Char : Character) return Entity_Id; 1237 -- This function is similar to New_External_Entity, except that the 1238 -- name is constructed by New_Internal_Name (Id_Char). This is used 1239 -- when the resulting entity does not have to be referenced as a 1240 -- public entity (and in this case Is_Public is not set). 1241 1242 procedure Next_Actual (Actual_Id : in out Node_Id); 1243 pragma Inline (Next_Actual); 1244 -- Next_Actual (N) is equivalent to N := Next_Actual (N). Note that we 1245 -- inline this procedural form, but not the functional form that follows. 1246 1247 function Next_Actual (Actual_Id : Node_Id) return Node_Id; 1248 -- Find next actual parameter in declaration order. As described for 1249 -- First_Actual, this is the next actual in the declaration order, not 1250 -- the call order, so this does not correspond to simply taking the 1251 -- next entry of the Parameter_Associations list. The argument is an 1252 -- actual previously returned by a call to First_Actual or Next_Actual. 1253 -- Note that the result produced is always an expression, not a parameter 1254 -- association node, even if named notation was used. 1255 1256 function No_Scalar_Parts (T : Entity_Id) return Boolean; 1257 -- Tests if type T can be determined at compile time to have no scalar 1258 -- parts in the sense of the Valid_Scalars attribute. Returns True if 1259 -- this is the case, meaning that the result of Valid_Scalars is True. 1260 1261 procedure Normalize_Actuals 1262 (N : Node_Id; 1263 S : Entity_Id; 1264 Report : Boolean; 1265 Success : out Boolean); 1266 -- Reorders lists of actuals according to names of formals, value returned 1267 -- in Success indicates success of reordering. For more details, see body. 1268 -- Errors are reported only if Report is set to True. 1269 1270 procedure Note_Possible_Modification (N : Node_Id; Sure : Boolean); 1271 -- This routine is called if the sub-expression N maybe the target of 1272 -- an assignment (e.g. it is the left side of an assignment, used as 1273 -- an out parameters, or used as prefixes of access attributes). It 1274 -- sets May_Be_Modified in the associated entity if there is one, 1275 -- taking into account the rule that in the case of renamed objects, 1276 -- it is the flag in the renamed object that must be set. 1277 -- 1278 -- The parameter Sure is set True if the modification is sure to occur 1279 -- (e.g. target of assignment, or out parameter), and to False if the 1280 -- modification is only potential (e.g. address of entity taken). 1281 1282 function Original_Corresponding_Operation (S : Entity_Id) return Entity_Id; 1283 -- [Ada 2012: AI05-0125-1]: If S is an inherited dispatching primitive S2, 1284 -- or overrides an inherited dispatching primitive S2, the original 1285 -- corresponding operation of S is the original corresponding operation of 1286 -- S2. Otherwise, it is S itself. 1287 1288 function Object_Access_Level (Obj : Node_Id) return Uint; 1289 -- Return the accessibility level of the view of the object Obj. 1290 -- For convenience, qualified expressions applied to object names 1291 -- are also allowed as actuals for this function. 1292 1293 function Primitive_Names_Match (E1, E2 : Entity_Id) return Boolean; 1294 -- Returns True if the names of both entities correspond with matching 1295 -- primitives. This routine includes support for the case in which one 1296 -- or both entities correspond with entities built by Derive_Subprogram 1297 -- with a special name to avoid being overridden (i.e. return true in case 1298 -- of entities with names "nameP" and "name" or vice versa). 1299 1300 function Private_Component (Type_Id : Entity_Id) return Entity_Id; 1301 -- Returns some private component (if any) of the given Type_Id. 1302 -- Used to enforce the rules on visibility of operations on composite 1303 -- types, that depend on the full view of the component type. For a 1304 -- record type there may be several such components, we just return 1305 -- the first one. 1306 1307 procedure Process_End_Label 1308 (N : Node_Id; 1309 Typ : Character; 1310 Ent : Entity_Id); 1311 -- N is a node whose End_Label is to be processed, generating all 1312 -- appropriate cross-reference entries, and performing style checks 1313 -- for any identifier references in the end label. Typ is either 1314 -- 'e' or 't indicating the type of the cross-reference entity 1315 -- (e for spec, t for body, see Lib.Xref spec for details). The 1316 -- parameter Ent gives the entity to which the End_Label refers, 1317 -- and to which cross-references are to be generated. 1318 1319 function References_Generic_Formal_Type (N : Node_Id) return Boolean; 1320 -- Returns True if the expression Expr contains any references to a 1321 -- generic type. This can only happen within a generic template. 1322 1323 procedure Remove_Homonym (E : Entity_Id); 1324 -- Removes E from the homonym chain 1325 1326 function Rep_To_Pos_Flag (E : Entity_Id; Loc : Source_Ptr) return Node_Id; 1327 -- This is used to construct the second argument in a call to Rep_To_Pos 1328 -- which is Standard_True if range checks are enabled (E is an entity to 1329 -- which the Range_Checks_Suppressed test is applied), and Standard_False 1330 -- if range checks are suppressed. Loc is the location for the node that 1331 -- is returned (which is a New_Occurrence of the appropriate entity). 1332 -- 1333 -- Note: one might think that it would be fine to always use True and 1334 -- to ignore the suppress in this case, but it is generally better to 1335 -- believe a request to suppress exceptions if possible, and further 1336 -- more there is at least one case in the generated code (the code for 1337 -- array assignment in a loop) that depends on this suppression. 1338 1339 procedure Require_Entity (N : Node_Id); 1340 -- N is a node which should have an entity value if it is an entity name. 1341 -- If not, then check if there were previous errors. If so, just fill 1342 -- in with Any_Id and ignore. Otherwise signal a program error exception. 1343 -- This is used as a defense mechanism against ill-formed trees caused by 1344 -- previous errors (particularly in -gnatq mode). 1345 1346 function Requires_Transient_Scope (Id : Entity_Id) return Boolean; 1347 -- Id is a type entity. The result is True when temporaries of this type 1348 -- need to be wrapped in a transient scope to be reclaimed properly when a 1349 -- secondary stack is in use. Examples of types requiring such wrapping are 1350 -- controlled types and variable-sized types including unconstrained 1351 -- arrays. 1352 1353 procedure Reset_Analyzed_Flags (N : Node_Id); 1354 -- Reset the Analyzed flags in all nodes of the tree whose root is N 1355 1356 function Returns_Unconstrained_Type (Subp : Entity_Id) return Boolean; 1357 -- Return true if Subp is a function that returns an unconstrained type 1358 1359 function Safe_To_Capture_Value 1360 (N : Node_Id; 1361 Ent : Entity_Id; 1362 Cond : Boolean := False) return Boolean; 1363 -- The caller is interested in capturing a value (either the current value, 1364 -- or an indication that the value is non-null) for the given entity Ent. 1365 -- This value can only be captured if sequential execution semantics can be 1366 -- properly guaranteed so that a subsequent reference will indeed be sure 1367 -- that this current value indication is correct. The node N is the 1368 -- construct which resulted in the possible capture of the value (this 1369 -- is used to check if we are in a conditional). 1370 -- 1371 -- Cond is used to skip the test for being inside a conditional. It is used 1372 -- in the case of capturing values from if/while tests, which already do a 1373 -- proper job of handling scoping issues without this help. 1374 -- 1375 -- The only entities whose values can be captured are OUT and IN OUT formal 1376 -- parameters, and variables unless Cond is True, in which case we also 1377 -- allow IN formals, loop parameters and constants, where we cannot ever 1378 -- capture actual value information, but we can capture conditional tests. 1379 1380 function Same_Name (N1, N2 : Node_Id) return Boolean; 1381 -- Determine if two (possibly expanded) names are the same name. This is 1382 -- a purely syntactic test, and N1 and N2 need not be analyzed. 1383 1384 function Same_Object (Node1, Node2 : Node_Id) return Boolean; 1385 -- Determine if Node1 and Node2 are known to designate the same object. 1386 -- This is a semantic test and both nodes must be fully analyzed. A result 1387 -- of True is decisively correct. A result of False does not necessarily 1388 -- mean that different objects are designated, just that this could not 1389 -- be reliably determined at compile time. 1390 1391 function Same_Type (T1, T2 : Entity_Id) return Boolean; 1392 -- Determines if T1 and T2 represent exactly the same type. Two types 1393 -- are the same if they are identical, or if one is an unconstrained 1394 -- subtype of the other, or they are both common subtypes of the same 1395 -- type with identical constraints. The result returned is conservative. 1396 -- It is True if the types are known to be the same, but a result of 1397 -- False is indecisive (e.g. the compiler may not be able to tell that 1398 -- two constraints are identical). 1399 1400 function Same_Value (Node1, Node2 : Node_Id) return Boolean; 1401 -- Determines if Node1 and Node2 are known to be the same value, which is 1402 -- true if they are both compile time known values and have the same value, 1403 -- or if they are the same object (in the sense of function Same_Object). 1404 -- A result of False does not necessarily mean they have different values, 1405 -- just that it is not possible to determine they have the same value. 1406 1407 function Scope_Within_Or_Same (Scope1, Scope2 : Entity_Id) return Boolean; 1408 -- Determines if the entity Scope1 is the same as Scope2, or if it is 1409 -- inside it, where both entities represent scopes. Note that scopes 1410 -- are only partially ordered, so Scope_Within_Or_Same (A,B) and 1411 -- Scope_Within_Or_Same (B,A) can both be False for a given pair A,B. 1412 1413 function Scope_Within (Scope1, Scope2 : Entity_Id) return Boolean; 1414 -- Like Scope_Within_Or_Same, except that this function returns 1415 -- False in the case where Scope1 and Scope2 are the same scope. 1416 1417 procedure Set_Convention (E : Entity_Id; Val : Convention_Id); 1418 -- Same as Basic_Set_Convention, but with an extra check for access types. 1419 -- In particular, if E is an access-to-subprogram type, and Val is a 1420 -- foreign convention, then we set Can_Use_Internal_Rep to False on E. 1421 1422 procedure Set_Current_Entity (E : Entity_Id); 1423 pragma Inline (Set_Current_Entity); 1424 -- Establish the entity E as the currently visible definition of its 1425 -- associated name (i.e. the Node_Id associated with its name). 1426 1427 procedure Set_Debug_Info_Needed (T : Entity_Id); 1428 -- Sets the Debug_Info_Needed flag on entity T , and also on any entities 1429 -- that are needed by T (for an object, the type of the object is needed, 1430 -- and for a type, various subsidiary types are needed -- see body for 1431 -- details). Never has any effect on T if the Debug_Info_Off flag is set. 1432 -- This routine should always be used instead of Set_Needs_Debug_Info to 1433 -- ensure that subsidiary entities are properly handled. 1434 1435 procedure Set_Entity_With_Style_Check (N : Node_Id; Val : Entity_Id); 1436 -- This procedure has the same calling sequence as Set_Entity, but 1437 -- if Style_Check is set, then it calls a style checking routine which 1438 -- can check identifier spelling style. 1439 1440 procedure Set_Name_Entity_Id (Id : Name_Id; Val : Entity_Id); 1441 pragma Inline (Set_Name_Entity_Id); 1442 -- Sets the Entity_Id value associated with the given name, which is the 1443 -- Id of the innermost visible entity with the given name. See the body 1444 -- of package Sem_Ch8 for further details on the handling of visibility. 1445 1446 procedure Set_Next_Actual (Ass1_Id : Node_Id; Ass2_Id : Node_Id); 1447 -- The arguments may be parameter associations, whose descendants 1448 -- are the optional formal name and the actual parameter. Positional 1449 -- parameters are already members of a list, and do not need to be 1450 -- chained separately. See also First_Actual and Next_Actual. 1451 1452 procedure Set_Optimize_Alignment_Flags (E : Entity_Id); 1453 pragma Inline (Set_Optimize_Alignment_Flags); 1454 -- Sets Optimize_Alignment_Space/Time flags in E from current settings 1455 1456 procedure Set_Public_Status (Id : Entity_Id); 1457 -- If an entity (visible or otherwise) is defined in a library 1458 -- package, or a package that is itself public, then this subprogram 1459 -- labels the entity public as well. 1460 1461 procedure Set_Referenced_Modified (N : Node_Id; Out_Param : Boolean); 1462 -- N is the node for either a left hand side (Out_Param set to False), 1463 -- or an Out or In_Out parameter (Out_Param set to True). If there is 1464 -- an assignable entity being referenced, then the appropriate flag 1465 -- (Referenced_As_LHS if Out_Param is False, Referenced_As_Out_Parameter 1466 -- if Out_Param is True) is set True, and the other flag set False. 1467 1468 procedure Set_Scope_Is_Transient (V : Boolean := True); 1469 -- Set the flag Is_Transient of the current scope 1470 1471 procedure Set_Size_Info (T1, T2 : Entity_Id); 1472 pragma Inline (Set_Size_Info); 1473 -- Copies the Esize field and Has_Biased_Representation flag from sub(type) 1474 -- entity T2 to (sub)type entity T1. Also copies the Is_Unsigned_Type flag 1475 -- in the fixed-point and discrete cases, and also copies the alignment 1476 -- value from T2 to T1. It does NOT copy the RM_Size field, which must be 1477 -- separately set if this is required to be copied also. 1478 1479 function Scope_Is_Transient return Boolean; 1480 -- True if the current scope is transient 1481 1482 function Static_Boolean (N : Node_Id) return Uint; 1483 -- This function analyzes the given expression node and then resolves it 1484 -- as Standard.Boolean. If the result is static, then Uint_1 or Uint_0 is 1485 -- returned corresponding to the value, otherwise an error message is 1486 -- output and No_Uint is returned. 1487 1488 function Static_Integer (N : Node_Id) return Uint; 1489 -- This function analyzes the given expression node and then resolves it 1490 -- as any integer type. If the result is static, then the value of the 1491 -- universal expression is returned, otherwise an error message is output 1492 -- and a value of No_Uint is returned. 1493 1494 function Statically_Different (E1, E2 : Node_Id) return Boolean; 1495 -- Return True if it can be statically determined that the Expressions 1496 -- E1 and E2 refer to different objects 1497 1498 function Subprogram_Access_Level (Subp : Entity_Id) return Uint; 1499 -- Return the accessibility level of the view denoted by Subp 1500 1501 function Support_Atomic_Primitives (Typ : Entity_Id) return Boolean; 1502 -- Return True if Typ supports the GCC built-in atomic operations (i.e. if 1503 -- Typ is properly sized and aligned). 1504 1505 procedure Trace_Scope (N : Node_Id; E : Entity_Id; Msg : String); 1506 -- Print debugging information on entry to each unit being analyzed 1507 1508 procedure Transfer_Entities (From : Entity_Id; To : Entity_Id); 1509 -- Move a list of entities from one scope to another, and recompute 1510 -- Is_Public based upon the new scope. 1511 1512 function Type_Access_Level (Typ : Entity_Id) return Uint; 1513 -- Return the accessibility level of Typ 1514 1515 function Type_Without_Stream_Operation 1516 (T : Entity_Id; 1517 Op : TSS_Name_Type := TSS_Null) return Entity_Id; 1518 -- AI05-0161: In Ada 2012, if the restriction No_Default_Stream_Attributes 1519 -- is active then we cannot generate stream subprograms for composite types 1520 -- with elementary subcomponents that lack user-defined stream subprograms. 1521 -- This predicate determines whether a type has such an elementary 1522 -- subcomponent. If Op is TSS_Null, a type that lacks either Read or Write 1523 -- prevents the construction of a composite stream operation. If Op is 1524 -- specified we check only for the given stream operation. 1525 1526 function Unique_Defining_Entity (N : Node_Id) return Entity_Id; 1527 -- Return the entity which represents declaration N, so that different 1528 -- views of the same entity have the same unique defining entity: 1529 -- * package spec and body; 1530 -- * subprogram declaration, subprogram stub and subprogram body; 1531 -- * private view and full view of a type; 1532 -- * private view and full view of a deferred constant. 1533 -- In other cases, return the defining entity for N. 1534 1535 function Unique_Entity (E : Entity_Id) return Entity_Id; 1536 -- Return the unique entity for entity E, which would be returned by 1537 -- Unique_Defining_Entity if applied to the enclosing declaration of E. 1538 1539 function Unique_Name (E : Entity_Id) return String; 1540 -- Return a unique name for entity E, which could be used to identify E 1541 -- across compilation units. 1542 1543 function Unit_Is_Visible (U : Entity_Id) return Boolean; 1544 -- Determine whether a compilation unit is visible in the current context, 1545 -- because there is a with_clause that makes the unit available. Used to 1546 -- provide better messages on common visiblity errors on operators. 1547 1548 function Universal_Interpretation (Opnd : Node_Id) return Entity_Id; 1549 -- Yields Universal_Integer or Universal_Real if this is a candidate 1550 1551 function Unqualify (Expr : Node_Id) return Node_Id; 1552 pragma Inline (Unqualify); 1553 -- Removes any qualifications from Expr. For example, for T1'(T2'(X)), this 1554 -- returns X. If Expr is not a qualified expression, returns Expr. 1555 1556 function Visible_Ancestors (Typ : Entity_Id) return Elist_Id; 1557 -- [Ada 2012:AI-0125-1]: Collect all the visible parents and progenitors 1558 -- of a type extension or private extension declaration. If the full-view 1559 -- of private parents and progenitors is available then it is used to 1560 -- generate the list of visible ancestors; otherwise their partial 1561 -- view is added to the resulting list. 1562 1563 function Within_Init_Proc return Boolean; 1564 -- Determines if Current_Scope is within an init proc 1565 1566 procedure Wrong_Type (Expr : Node_Id; Expected_Type : Entity_Id); 1567 -- Output error message for incorrectly typed expression. Expr is the node 1568 -- for the incorrectly typed construct (Etype (Expr) is the type found), 1569 -- and Expected_Type is the entity for the expected type. Note that Expr 1570 -- does not have to be a subexpression, anything with an Etype field may 1571 -- be used. 1572 1573end Sem_Util; 1574