MacroInfo.cpp revision 193326 
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"
16using namespace clang;
17
18MacroInfo::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///
34bool 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