1------------------------------------------------------------------------------ 2-- -- 3-- GNAT COMPILER COMPONENTS -- 4-- -- 5-- S E M _ P R A G -- 6-- -- 7-- S p e c -- 8-- -- 9-- Copyright (C) 1992-2012, Free Software Foundation, Inc. -- 10-- -- 11-- GNAT is free software; you can redistribute it and/or modify it under -- 12-- terms of the GNU General Public License as published by the Free Soft- -- 13-- ware Foundation; either version 3, or (at your option) any later ver- -- 14-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 15-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 16-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- 17-- for more details. You should have received a copy of the GNU General -- 18-- Public License distributed with GNAT; see file COPYING3. If not, go to -- 19-- http://www.gnu.org/licenses for a complete copy of the license. -- 20-- -- 21-- GNAT was originally developed by the GNAT team at New York University. -- 22-- Extensive contributions were provided by Ada Core Technologies Inc. -- 23-- -- 24------------------------------------------------------------------------------ 25 26-- Pragma handling is isolated in a separate package 27-- (logically this processing belongs in chapter 4) 28 29with Namet; use Namet; 30with Types; use Types; 31 32package Sem_Prag is 33 34 ----------------- 35 -- Subprograms -- 36 ----------------- 37 38 procedure Analyze_Pragma (N : Node_Id); 39 -- Analyze procedure for pragma reference node N 40 41 procedure Analyze_CTC_In_Decl_Part (N : Node_Id; S : Entity_Id); 42 -- Special analyze routine for contract-case and test-case pragmas that 43 -- appears within a declarative part where the pragma is associated with 44 -- a subprogram specification. N is the pragma node, and S is the entity 45 -- for the related subprogram. This procedure does a preanalysis of the 46 -- expressions in the pragma as "spec expressions" (see section in Sem 47 -- "Handling of Default and Per-Object Expressions..."). 48 49 procedure Analyze_PPC_In_Decl_Part (N : Node_Id; S : Entity_Id); 50 -- Special analyze routine for precondition/postcondition pragma that 51 -- appears within a declarative part where the pragma is associated 52 -- with a subprogram specification. N is the pragma node, and S is the 53 -- entity for the related subprogram. This procedure does a preanalysis 54 -- of the expressions in the pragma as "spec expressions" (see section 55 -- in Sem "Handling of Default and Per-Object Expressions..."). 56 57 function Check_Disabled (Nam : Name_Id) return Boolean; 58 -- This function is used in connection with pragmas Assertion, Check, 59 -- Precondition, and Postcondition, to determine if Check pragmas (or 60 -- corresponding Assert, Precondition, or Postcondition pragmas) are 61 -- currently disabled (as set by a Check_Policy or Assertion_Policy pragma 62 -- with the Disable argument). 63 64 function Check_Enabled (Nam : Name_Id) return Boolean; 65 -- This function is used in connection with pragmas Assertion, Check, 66 -- Precondition, and Postcondition, to determine if Check pragmas (or 67 -- corresponding Assert, Precondition, or Postcondition pragmas) are 68 -- currently active, as determined by the presence of -gnata on the 69 -- command line (which sets the default), and the appearance of pragmas 70 -- Check_Policy and Assertion_Policy as configuration pragmas either in 71 -- a configuration pragma file, or at the start of the current unit. 72 -- True is returned if the specified check is enabled. 73 74 function Delay_Config_Pragma_Analyze (N : Node_Id) return Boolean; 75 -- N is a pragma appearing in a configuration pragma file. Most such 76 -- pragmas are analyzed when the file is read, before parsing and analyzing 77 -- the main unit. However, the analysis of certain pragmas results in 78 -- adding information to the compiled main unit, and this cannot be done 79 -- till the main unit is processed. Such pragmas return True from this 80 -- function and in Frontend pragmas where Delay_Config_Pragma_Analyze is 81 -- True have their analysis delayed until after the main program is parsed 82 -- and analyzed. 83 84 procedure Initialize; 85 -- Initializes data structures used for pragma processing. Must be called 86 -- before analyzing each new main source program. 87 88 function Is_Non_Significant_Pragma_Reference (N : Node_Id) return Boolean; 89 -- The node N is a node for an entity and the issue is whether the 90 -- occurrence is a reference for the purposes of giving warnings about 91 -- unreferenced variables. This function returns True if the reference is 92 -- not a reference from this point of view (e.g. the occurrence in a pragma 93 -- Pack) and False if it is a real reference (e.g. the occurrence in a 94 -- pragma Export); 95 96 function Is_Pragma_String_Literal (Par : Node_Id) return Boolean; 97 -- Given an N_Pragma_Argument_Association node, Par, which has the form of 98 -- an operator symbol, determines whether or not it should be treated as an 99 -- string literal. This is called by Sem_Ch6.Analyze_Operator_Symbol. If 100 -- True is returned, the argument is converted to a string literal. If 101 -- False is returned, then the argument is treated as an entity reference 102 -- to the operator. 103 104 function Is_Config_Static_String (Arg : Node_Id) return Boolean; 105 -- This is called for a configuration pragma that requires either string 106 -- literal or a concatenation of string literals. We cannot use normal 107 -- static string processing because it is too early in the case of the 108 -- pragma appearing in a configuration pragmas file. If Arg is of an 109 -- appropriate form, then this call obtains the string (doing any necessary 110 -- concatenations) and places it in Name_Buffer, setting Name_Len to its 111 -- length, and then returns True. If it is not of the correct form, then an 112 -- appropriate error message is posted, and False is returned. 113 114 procedure Make_Aspect_For_PPC_In_Gen_Sub_Decl (Decl : Node_Id); 115 -- This routine makes aspects from precondition or postcondition pragmas 116 -- that appear within a generic subprogram declaration. Decl is the generic 117 -- subprogram declaration node. Note that the aspects are attached to the 118 -- generic copy and also to the orginal tree. 119 120 procedure Process_Compilation_Unit_Pragmas (N : Node_Id); 121 -- Called at the start of processing compilation unit N to deal with any 122 -- special issues regarding pragmas. In particular, we have to deal with 123 -- Suppress_All at this stage, since it can appear after the unit instead 124 -- of before (actually we allow it to appear anywhere). 125 126 procedure Set_Encoded_Interface_Name (E : Entity_Id; S : Node_Id); 127 -- This routine is used to set an encoded interface name. The node S is an 128 -- N_String_Literal node for the external name to be set, and E is an 129 -- entity whose Interface_Name field is to be set. In the normal case where 130 -- S contains a name that is a valid C identifier, then S is simply set as 131 -- the value of the Interface_Name. Otherwise it is encoded. See the body 132 -- for details of the encoding. This encoding is only done on VMS systems, 133 -- since it seems pretty silly, but is needed to pass some dubious tests in 134 -- the test suite. 135 136end Sem_Prag; 137