forked from OSchip/llvm-project
99 lines
3.3 KiB
C++
99 lines
3.3 KiB
C++
//===--- LambdaFunctionNameCheck.cpp - clang-tidy--------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "LambdaFunctionNameCheck.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/ASTMatchers/ASTMatchFinder.h"
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#include "clang/Frontend/CompilerInstance.h"
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#include "clang/Lex/MacroInfo.h"
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#include "clang/Lex/Preprocessor.h"
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using namespace clang::ast_matchers;
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namespace clang {
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namespace tidy {
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namespace bugprone {
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namespace {
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// Keep track of macro expansions that contain both __FILE__ and __LINE__. If
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// such a macro also uses __func__ or __FUNCTION__, we don't want to issue a
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// warning because __FILE__ and __LINE__ may be useful even if __func__ or
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// __FUNCTION__ is not, especially if the macro could be used in the context of
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// either a function body or a lambda body.
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class MacroExpansionsWithFileAndLine : public PPCallbacks {
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public:
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explicit MacroExpansionsWithFileAndLine(
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LambdaFunctionNameCheck::SourceRangeSet *SME)
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: SuppressMacroExpansions(SME) {}
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void MacroExpands(const Token &MacroNameTok,
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const MacroDefinition &MD, SourceRange Range,
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const MacroArgs *Args) override {
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bool has_file = false;
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bool has_line = false;
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for (const auto& T : MD.getMacroInfo()->tokens()) {
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if (T.is(tok::identifier)) {
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StringRef IdentName = T.getIdentifierInfo()->getName();
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if (IdentName == "__FILE__") {
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has_file = true;
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} else if (IdentName == "__LINE__") {
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has_line = true;
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}
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}
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}
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if (has_file && has_line) {
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SuppressMacroExpansions->insert(Range);
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}
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}
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private:
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LambdaFunctionNameCheck::SourceRangeSet* SuppressMacroExpansions;
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};
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} // namespace
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void LambdaFunctionNameCheck::registerMatchers(MatchFinder *Finder) {
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// Match on PredefinedExprs inside a lambda.
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Finder->addMatcher(predefinedExpr(hasAncestor(lambdaExpr())).bind("E"),
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this);
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}
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void LambdaFunctionNameCheck::registerPPCallbacks(
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const SourceManager &SM, Preprocessor *PP, Preprocessor *ModuleExpanderPP) {
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PP->addPPCallbacks(std::make_unique<MacroExpansionsWithFileAndLine>(
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&SuppressMacroExpansions));
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}
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void LambdaFunctionNameCheck::check(const MatchFinder::MatchResult &Result) {
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const auto *E = Result.Nodes.getNodeAs<PredefinedExpr>("E");
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if (E->getIdentKind() != PredefinedExpr::Func &&
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E->getIdentKind() != PredefinedExpr::Function) {
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// We don't care about other PredefinedExprs.
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return;
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}
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if (E->getLocation().isMacroID()) {
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auto ER =
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Result.SourceManager->getImmediateExpansionRange(E->getLocation());
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if (SuppressMacroExpansions.find(ER.getAsRange()) !=
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SuppressMacroExpansions.end()) {
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// This is a macro expansion for which we should not warn.
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return;
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}
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}
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diag(E->getLocation(),
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"inside a lambda, '%0' expands to the name of the function call "
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"operator; consider capturing the name of the enclosing function "
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"explicitly")
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<< PredefinedExpr::getIdentKindName(E->getIdentKind());
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}
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} // namespace bugprone
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} // namespace tidy
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} // namespace clang
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