1 //===--- MacroInfo.cpp - Information about #defined identifiers -----------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the MacroInfo interface.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "clang/Lex/MacroInfo.h"
15 #include "clang/Lex/Preprocessor.h"
16 using namespace clang;
17 
18 MacroInfo::MacroInfo(SourceLocation DefLoc) : Location(DefLoc) {
19   IsFunctionLike = false;
20   IsC99Varargs = false;
21   IsGNUVarargs = false;
22   IsBuiltinMacro = false;
23   IsDisabled = false;
24   IsUsed = true;
25 
26   ArgumentList = 0;
27   NumArguments = 0;
28 }
29 
30 /// isIdenticalTo - Return true if the specified macro definition is equal to
31 /// this macro in spelling, arguments, and whitespace.  This is used to emit
32 /// duplicate definition warnings.  This implements the rules in C99 6.10.3.
33 ///
34 bool MacroInfo::isIdenticalTo(const MacroInfo &Other, Preprocessor &PP) const {
35   // Check # tokens in replacement, number of args, and various flags all match.
36   if (ReplacementTokens.size() != Other.ReplacementTokens.size() ||
37       getNumArgs() != Other.getNumArgs() ||
38       isFunctionLike() != Other.isFunctionLike() ||
39       isC99Varargs() != Other.isC99Varargs() ||
40       isGNUVarargs() != Other.isGNUVarargs())
41     return false;
42 
43   // Check arguments.
44   for (arg_iterator I = arg_begin(), OI = Other.arg_begin(), E = arg_end();
45        I != E; ++I, ++OI)
46     if (*I != *OI) return false;
47 
48   // Check all the tokens.
49   for (unsigned i = 0, e = ReplacementTokens.size(); i != e; ++i) {
50     const Token &A = ReplacementTokens[i];
51     const Token &B = Other.ReplacementTokens[i];
52     if (A.getKind() != B.getKind())
53       return false;
54 
55     // If this isn't the first first token, check that the whitespace and
56     // start-of-line characteristics match.
57     if (i != 0 &&
58         (A.isAtStartOfLine() != B.isAtStartOfLine() ||
59          A.hasLeadingSpace() != B.hasLeadingSpace()))
60       return false;
61 
62     // If this is an identifier, it is easy.
63     if (A.getIdentifierInfo() || B.getIdentifierInfo()) {
64       if (A.getIdentifierInfo() != B.getIdentifierInfo())
65         return false;
66       continue;
67     }
68 
69     // Otherwise, check the spelling.
70     if (PP.getSpelling(A) != PP.getSpelling(B))
71       return false;
72   }
73 
74   return true;
75 }
76