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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),
ArgumentList(nullptr),
NumArguments(0),
IsDefinitionLengthCached(false),
IsFunctionLike(false),
IsC99Varargs(false),
IsGNUVarargs(false),
IsBuiltinMacro(false),
HasCommaPasting(false),
IsDisabled(false),
IsUsed(false),
IsAllowRedefinitionsWithoutWarning(false),
IsWarnIfUnused(false),
FromASTFile(false),
UsedForHeaderGuard(false) {
}
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;
}
/// \brief Return true if the specified macro definition is equal to
/// this macro in spelling, arguments, and whitespace.
///
/// \param Syntactically if true, the macro definitions can be identical even
/// if they use different identifiers for the function macro parameters.
/// Otherwise the comparison is lexical and this implements the rules in
/// C99 6.10.3.
bool MacroInfo::isIdenticalTo(const MacroInfo &Other, Preprocessor &PP,
bool Syntactically) const {
bool Lexically = !Syntactically;
// 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;
if (Lexically) {
// 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())
continue;
if (Lexically)
return false;
// With syntactic equivalence the parameter names can be different as long
// as they are used in the same place.
int AArgNum = getArgumentNum(A.getIdentifierInfo());
if (AArgNum == -1)
return false;
if (AArgNum != Other.getArgumentNum(B.getIdentifierInfo()))
return false;
continue;
}
// Otherwise, check the spelling.
if (PP.getSpelling(A) != PP.getSpelling(B))
return false;
}
return true;
}
MacroDirective::DefInfo MacroDirective::getDefinition() {
MacroDirective *MD = this;
SourceLocation UndefLoc;
Optional<bool> isPublic;
for (; MD; MD = MD->getPrevious()) {
if (DefMacroDirective *DefMD = dyn_cast<DefMacroDirective>(MD))
return DefInfo(DefMD, UndefLoc,
!isPublic.hasValue() || isPublic.getValue());
if (UndefMacroDirective *UndefMD = dyn_cast<UndefMacroDirective>(MD)) {
UndefLoc = UndefMD->getLocation();
continue;
}
VisibilityMacroDirective *VisMD = cast<VisibilityMacroDirective>(MD);
if (!isPublic.hasValue())
isPublic = VisMD->isPublic();
}
return DefInfo(nullptr, UndefLoc,
!isPublic.hasValue() || isPublic.getValue());
}
const MacroDirective::DefInfo
MacroDirective::findDirectiveAtLoc(SourceLocation L, SourceManager &SM) const {
assert(L.isValid() && "SourceLocation is invalid.");
for (DefInfo Def = getDefinition(); Def; Def = Def.getPreviousDefinition()) {
if (Def.getLocation().isInvalid() || // For macros defined on the command line.
SM.isBeforeInTranslationUnit(Def.getLocation(), L))
return (!Def.isUndefined() ||
SM.isBeforeInTranslationUnit(L, Def.getUndefLocation()))
? Def : DefInfo();
}
return DefInfo();
}
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