forked from OSchip/llvm-project
66 lines
2.3 KiB
C++
66 lines
2.3 KiB
C++
//===--- TwineLocalCheck.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 "TwineLocalCheck.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/ASTMatchers/ASTMatchers.h"
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#include "clang/Lex/Lexer.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 llvm_check {
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void TwineLocalCheck::registerMatchers(MatchFinder *Finder) {
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auto TwineType =
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qualType(hasDeclaration(recordDecl(hasName("::llvm::Twine"))));
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Finder->addMatcher(varDecl(hasType(TwineType)).bind("variable"), this);
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}
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void TwineLocalCheck::check(const MatchFinder::MatchResult &Result) {
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const auto *VD = Result.Nodes.getNodeAs<VarDecl>("variable");
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auto Diag = diag(VD->getLocation(),
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"twine variables are prone to use-after-free bugs");
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// If this VarDecl has an initializer try to fix it.
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if (VD->hasInit()) {
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// Peel away implicit constructors and casts so we can see the actual type
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// of the initializer.
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const Expr *C = VD->getInit()->IgnoreImplicit();
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while (isa<CXXConstructExpr>(C)) {
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if (cast<CXXConstructExpr>(C)->getNumArgs() == 0)
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break;
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C = cast<CXXConstructExpr>(C)->getArg(0)->IgnoreParenImpCasts();
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}
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SourceRange TypeRange =
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VD->getTypeSourceInfo()->getTypeLoc().getSourceRange();
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// A real Twine, turn it into a std::string.
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if (VD->getType()->getCanonicalTypeUnqualified() ==
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C->getType()->getCanonicalTypeUnqualified()) {
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SourceLocation EndLoc = Lexer::getLocForEndOfToken(
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VD->getInit()->getEndLoc(), 0, *Result.SourceManager, getLangOpts());
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Diag << FixItHint::CreateReplacement(TypeRange, "std::string")
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<< FixItHint::CreateInsertion(VD->getInit()->getBeginLoc(), "(")
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<< FixItHint::CreateInsertion(EndLoc, ").str()");
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} else {
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// Just an implicit conversion. Insert the real type.
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Diag << FixItHint::CreateReplacement(
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TypeRange,
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C->getType().getAsString(Result.Context->getPrintingPolicy()));
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}
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}
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}
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} // namespace llvm_check
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} // namespace tidy
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} // namespace clang
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