ASTUtils.cpp
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//===---------- ASTUtils.cpp - clang-tidy ---------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "ASTUtils.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/ASTMatchers/ASTMatchers.h"
#include "clang/Lex/Lexer.h"
namespace clang {
namespace tidy {
namespace utils {
using namespace ast_matchers;
const FunctionDecl *getSurroundingFunction(ASTContext &Context,
const Stmt &Statement) {
return selectFirst<const FunctionDecl>(
"function", match(stmt(hasAncestor(functionDecl().bind("function"))),
Statement, Context));
}
bool IsBinaryOrTernary(const Expr *E) {
const Expr *E_base = E->IgnoreImpCasts();
if (clang::isa<clang::BinaryOperator>(E_base) ||
clang::isa<clang::ConditionalOperator>(E_base)) {
return true;
}
if (const auto *Operator =
clang::dyn_cast<clang::CXXOperatorCallExpr>(E_base)) {
return Operator->isInfixBinaryOp();
}
return false;
}
bool exprHasBitFlagWithSpelling(const Expr *Flags, const SourceManager &SM,
const LangOptions &LangOpts,
StringRef FlagName) {
// If the Flag is an integer constant, check it.
if (isa<IntegerLiteral>(Flags)) {
if (!SM.isMacroBodyExpansion(Flags->getBeginLoc()) &&
!SM.isMacroArgExpansion(Flags->getBeginLoc()))
return false;
// Get the macro name.
auto MacroName = Lexer::getSourceText(
CharSourceRange::getTokenRange(Flags->getSourceRange()), SM, LangOpts);
return MacroName == FlagName;
}
// If it's a binary OR operation.
if (const auto *BO = dyn_cast<BinaryOperator>(Flags))
if (BO->getOpcode() == clang::BinaryOperatorKind::BO_Or)
return exprHasBitFlagWithSpelling(BO->getLHS()->IgnoreParenCasts(), SM,
LangOpts, FlagName) ||
exprHasBitFlagWithSpelling(BO->getRHS()->IgnoreParenCasts(), SM,
LangOpts, FlagName);
// Otherwise, assume it has the flag.
return true;
}
bool rangeIsEntirelyWithinMacroArgument(SourceRange Range,
const SourceManager *SM) {
// Check if the range is entirely contained within a macro argument.
SourceLocation MacroArgExpansionStartForRangeBegin;
SourceLocation MacroArgExpansionStartForRangeEnd;
bool RangeIsEntirelyWithinMacroArgument =
SM &&
SM->isMacroArgExpansion(Range.getBegin(),
&MacroArgExpansionStartForRangeBegin) &&
SM->isMacroArgExpansion(Range.getEnd(),
&MacroArgExpansionStartForRangeEnd) &&
MacroArgExpansionStartForRangeBegin == MacroArgExpansionStartForRangeEnd;
return RangeIsEntirelyWithinMacroArgument;
}
bool rangeContainsMacroExpansion(SourceRange Range, const SourceManager *SM) {
return rangeIsEntirelyWithinMacroArgument(Range, SM) ||
Range.getBegin().isMacroID() || Range.getEnd().isMacroID();
}
bool rangeCanBeFixed(SourceRange Range, const SourceManager *SM) {
return utils::rangeIsEntirelyWithinMacroArgument(Range, SM) ||
!utils::rangeContainsMacroExpansion(Range, SM);
}
} // namespace utils
} // namespace tidy
} // namespace clang