------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- S E M _ P R A G -- -- -- -- S p e c -- -- -- -- Copyright (C) 1992-2013, Free Software Foundation, Inc. -- -- -- -- GNAT is free software; you can redistribute it and/or modify it under -- -- terms of the GNU General Public License as published by the Free Soft- -- -- ware Foundation; either version 3, or (at your option) any later ver- -- -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- -- for more details. You should have received a copy of the GNU General -- -- Public License distributed with GNAT; see file COPYING3. If not, go to -- -- http://www.gnu.org/licenses for a complete copy of the license. -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ -- Pragma handling is isolated in a separate package -- (logically this processing belongs in chapter 4) with Namet; use Namet; with Types; use Types; package Sem_Prag is ----------------- -- Subprograms -- ----------------- procedure Analyze_Pragma (N : Node_Id); -- Analyze procedure for pragma reference node N procedure Analyze_Contract_Cases_In_Decl_Part (N : Node_Id); -- Perform full analysis and expansion of delayed pragma Contract_Cases procedure Analyze_Depends_In_Decl_Part (N : Node_Id); -- Perform full analysis of delayed pragma Depends procedure Analyze_Global_In_Decl_Part (N : Node_Id); -- Perform full analysis of delayed pragma Global procedure Analyze_PPC_In_Decl_Part (N : Node_Id; S : Entity_Id); -- Special analyze routine for precondition/postcondition pragma that -- appears within a declarative part where the pragma is associated -- with a subprogram specification. N is the pragma node, and S is the -- entity for the related subprogram. This procedure does a preanalysis -- of the expressions in the pragma as "spec expressions" (see section -- in Sem "Handling of Default and Per-Object Expressions..."). procedure Analyze_Test_Case_In_Decl_Part (N : Node_Id; S : Entity_Id); -- Special analyze routine for contract-case and test-case pragmas that -- appears within a declarative part where the pragma is associated with -- a subprogram specification. N is the pragma node, and S is the entity -- for the related subprogram. This procedure does a preanalysis of the -- expressions in the pragma as "spec expressions" (see section in Sem -- "Handling of Default and Per-Object Expressions..."). function Check_Kind (Nam : Name_Id) return Name_Id; -- This function is used in connection with pragmas Assert, Check, -- and assertion aspects and pragmas, to determine if Check pragmas -- (or corresponding assertion aspects or pragmas) are currently active -- as determined by the presence of -gnata on the command line (which -- sets the default), and the appearance of pragmas Check_Policy and -- Assertion_Policy as configuration pragmas either in a configuration -- pragma file, or at the start of the current unit, or locally given -- Check_Policy and Assertion_Policy pragmas that are currently active. -- -- The value returned is one of the names Check, Ignore, Disable (On -- returns Check, and Off returns Ignore). -- -- Note: for assertion kinds Pre'Class, Post'Class, Invariant'Class, -- and Type_Invariant'Class, the name passed is Name_uPre, Name_uPost, -- Name_uInvariant, or Name_uType_Invariant, which corresponds to _Pre, -- _Post, _Invariant, or _Type_Invariant, which are special names used -- in identifiers to represent these attribute references. procedure Check_Applicable_Policy (N : Node_Id); -- N is either an N_Aspect or an N_Pragma node. There are two cases. If -- the name of the aspect or pragma is not one of those recognized as -- an assertion kind by an Assertion_Policy pragma, then the call has -- no effect. Note that in the case of a pragma derived from an aspect, -- the name we use for the purpose of this procedure is the aspect name, -- which may be different from the pragma name (e.g. Precondition for -- Pre aspect). In addition, 'Class aspects are recognized (and the -- corresponding special names used in the processing). -- -- If the name is a valid assertion kind name, then the Check_Policy pragma -- chain is checked for a matching entry (or for an Assertion entry which -- matches all possibilities). If a matching entry is found then the policy -- is checked. If it is Off, Ignore, or Disable, then the Is_Ignored flag -- is set in the aspect or pragma node. Additionally for policy Disable, -- the Is_Disabled flag is set. -- -- If no matching Check_Policy pragma is found then the effect depends on -- whether -gnata was used, if so, then the call has no effect, otherwise -- Is_Ignored (but not Is_Disabled) is set True. function Delay_Config_Pragma_Analyze (N : Node_Id) return Boolean; -- N is a pragma appearing in a configuration pragma file. Most such -- pragmas are analyzed when the file is read, before parsing and analyzing -- the main unit. However, the analysis of certain pragmas results in -- adding information to the compiled main unit, and this cannot be done -- till the main unit is processed. Such pragmas return True from this -- function and in Frontend pragmas where Delay_Config_Pragma_Analyze is -- True have their analysis delayed until after the main program is parsed -- and analyzed. procedure Initialize; -- Initializes data structures used for pragma processing. Must be called -- before analyzing each new main source program. function Is_Config_Static_String (Arg : Node_Id) return Boolean; -- This is called for a configuration pragma that requires either string -- literal or a concatenation of string literals. We cannot use normal -- static string processing because it is too early in the case of the -- pragma appearing in a configuration pragmas file. If Arg is of an -- appropriate form, then this call obtains the string (doing any necessary -- concatenations) and places it in Name_Buffer, setting Name_Len to its -- length, and then returns True. If it is not of the correct form, then an -- appropriate error message is posted, and False is returned. function Is_Non_Significant_Pragma_Reference (N : Node_Id) return Boolean; -- The node N is a node for an entity and the issue is whether the -- occurrence is a reference for the purposes of giving warnings about -- unreferenced variables. This function returns True if the reference is -- not a reference from this point of view (e.g. the occurrence in a pragma -- Pack) and False if it is a real reference (e.g. the occurrence in a -- pragma Export); function Is_Pragma_String_Literal (Par : Node_Id) return Boolean; -- Given an N_Pragma_Argument_Association node, Par, which has the form of -- an operator symbol, determines whether or not it should be treated as an -- string literal. This is called by Sem_Ch6.Analyze_Operator_Symbol. If -- True is returned, the argument is converted to a string literal. If -- False is returned, then the argument is treated as an entity reference -- to the operator. function Is_Valid_Assertion_Kind (Nam : Name_Id) return Boolean; -- Returns True if Nam is one of the names recognized as a valid assertion -- kind by the Assertion_Policy pragma. Note that the 'Class cases are -- represented by the corresponding special names Name_uPre, Name_uPost, -- Name_uInviarnat, and Name_uType_Invariant (_Pre, _Post, _Invariant, -- and _Type_Invariant). procedure Make_Aspect_For_PPC_In_Gen_Sub_Decl (Decl : Node_Id); -- This routine makes aspects from precondition or postcondition pragmas -- that appear within a generic subprogram declaration. Decl is the generic -- subprogram declaration node. Note that the aspects are attached to the -- generic copy and also to the orginal tree. procedure Process_Compilation_Unit_Pragmas (N : Node_Id); -- Called at the start of processing compilation unit N to deal with any -- special issues regarding pragmas. In particular, we have to deal with -- Suppress_All at this stage, since it can appear after the unit instead -- of before (actually we allow it to appear anywhere). procedure Set_Encoded_Interface_Name (E : Entity_Id; S : Node_Id); -- This routine is used to set an encoded interface name. The node S is an -- N_String_Literal node for the external name to be set, and E is an -- entity whose Interface_Name field is to be set. In the normal case where -- S contains a name that is a valid C identifier, then S is simply set as -- the value of the Interface_Name. Otherwise it is encoded. See the body -- for details of the encoding. This encoding is only done on VMS systems, -- since it seems pretty silly, but is needed to pass some dubious tests in -- the test suite. end Sem_Prag;