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//===--- MacroInfo.cpp - Information about #defined identifiers -----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the MacroInfo interface.
//
//===----------------------------------------------------------------------===//
#include "clang/Lex/MacroInfo.h"
#include "clang/Lex/Preprocessor.h"
using namespace clang;
MacroInfo::MacroInfo(SourceLocation DefLoc) : Location(DefLoc) {
IsFunctionLike = false;
IsC99Varargs = false;
IsGNUVarargs = false;
IsBuiltinMacro = false;
IsFromAST = false;
ChangedAfterLoad = false;
IsDisabled = false;
IsUsed = false;
IsAllowRedefinitionsWithoutWarning = false;
IsWarnIfUnused = false;
IsDefinitionLengthCached = false;
ArgumentList = 0;
NumArguments = 0;
}
MacroInfo::MacroInfo(const MacroInfo &MI, llvm::BumpPtrAllocator &PPAllocator) {
Location = MI.Location;
EndLocation = MI.EndLocation;
ReplacementTokens = MI.ReplacementTokens;
IsFunctionLike = MI.IsFunctionLike;
IsC99Varargs = MI.IsC99Varargs;
IsGNUVarargs = MI.IsGNUVarargs;
IsBuiltinMacro = MI.IsBuiltinMacro;
IsFromAST = MI.IsFromAST;
ChangedAfterLoad = MI.ChangedAfterLoad;
IsDisabled = MI.IsDisabled;
IsUsed = MI.IsUsed;
IsAllowRedefinitionsWithoutWarning = MI.IsAllowRedefinitionsWithoutWarning;
IsWarnIfUnused = MI.IsWarnIfUnused;
IsDefinitionLengthCached = MI.IsDefinitionLengthCached;
DefinitionLength = MI.DefinitionLength;
ArgumentList = 0;
NumArguments = 0;
setArgumentList(MI.ArgumentList, MI.NumArguments, PPAllocator);
}
unsigned MacroInfo::getDefinitionLengthSlow(SourceManager &SM) const {
assert(!IsDefinitionLengthCached);
IsDefinitionLengthCached = true;
if (ReplacementTokens.empty())
return (DefinitionLength = 0);
const Token &firstToken = ReplacementTokens.front();
const Token &lastToken = ReplacementTokens.back();
SourceLocation macroStart = firstToken.getLocation();
SourceLocation macroEnd = lastToken.getLocation();
assert(macroStart.isValid() && macroEnd.isValid());
assert((macroStart.isFileID() || firstToken.is(tok::comment)) &&
"Macro defined in macro?");
assert((macroEnd.isFileID() || lastToken.is(tok::comment)) &&
"Macro defined in macro?");
std::pair<FileID, unsigned>
startInfo = SM.getDecomposedExpansionLoc(macroStart);
std::pair<FileID, unsigned>
endInfo = SM.getDecomposedExpansionLoc(macroEnd);
assert(startInfo.first == endInfo.first &&
"Macro definition spanning multiple FileIDs ?");
assert(startInfo.second <= endInfo.second);
DefinitionLength = endInfo.second - startInfo.second;
DefinitionLength += lastToken.getLength();
return DefinitionLength;
}
/// isIdenticalTo - Return true if the specified macro definition is equal to
/// this macro in spelling, arguments, and whitespace. This is used to emit
/// duplicate definition warnings. This implements the rules in C99 6.10.3.
///
bool MacroInfo::isIdenticalTo(const MacroInfo &Other, Preprocessor &PP) const {
// Check # tokens in replacement, number of args, and various flags all match.
if (ReplacementTokens.size() != Other.ReplacementTokens.size() ||
getNumArgs() != Other.getNumArgs() ||
isFunctionLike() != Other.isFunctionLike() ||
isC99Varargs() != Other.isC99Varargs() ||
isGNUVarargs() != Other.isGNUVarargs())
return false;
// Check arguments.
for (arg_iterator I = arg_begin(), OI = Other.arg_begin(), E = arg_end();
I != E; ++I, ++OI)
if (*I != *OI) return false;
// Check all the tokens.
for (unsigned i = 0, e = ReplacementTokens.size(); i != e; ++i) {
const Token &A = ReplacementTokens[i];
const Token &B = Other.ReplacementTokens[i];
if (A.getKind() != B.getKind())
return false;
// If this isn't the first first token, check that the whitespace and
// start-of-line characteristics match.
if (i != 0 &&
(A.isAtStartOfLine() != B.isAtStartOfLine() ||
A.hasLeadingSpace() != B.hasLeadingSpace()))
return false;
// If this is an identifier, it is easy.
if (A.getIdentifierInfo() || B.getIdentifierInfo()) {
if (A.getIdentifierInfo() != B.getIdentifierInfo())
return false;
continue;
}
// Otherwise, check the spelling.
if (PP.getSpelling(A) != PP.getSpelling(B))
return false;
}
return true;
}
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