| //===--- 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(0), |
| NumArguments(0), |
| IsDefinitionLengthCached(false), |
| IsFunctionLike(false), |
| IsC99Varargs(false), |
| IsGNUVarargs(false), |
| IsBuiltinMacro(false), |
| HasCommaPasting(false), |
| IsDisabled(false), |
| IsUsed(false), |
| IsAllowRedefinitionsWithoutWarning(false), |
| IsWarnIfUnused(false), |
| FromASTFile(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; |
| } |
| |
| // 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; |
| } |
| |
| MacroDirective::DefInfo MacroDirective::getDefinition(bool AllowHidden) { |
| MacroDirective *MD = this; |
| SourceLocation UndefLoc; |
| Optional<bool> isPublic; |
| for (; MD; MD = MD->getPrevious()) { |
| if (!AllowHidden && MD->isHidden()) |
| continue; |
| |
| 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(); |
| } |
| |
| 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(); |
| } |