72 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "UndefinedMemoryManipulationCheck.h"10#include "clang/AST/ASTContext.h"11#include "clang/ASTMatchers/ASTMatchFinder.h"12 13using namespace clang::ast_matchers;14 15namespace clang::tidy::bugprone {16 17namespace {18AST_MATCHER(CXXRecordDecl, isNotTriviallyCopyable) {19 // For incomplete types, assume they are TriviallyCopyable.20 return Node.hasDefinition() ? !Node.isTriviallyCopyable() : false;21}22} // namespace23 24void UndefinedMemoryManipulationCheck::registerMatchers(MatchFinder *Finder) {25 const auto HasNotTriviallyCopyableDecl =26 hasDeclaration(cxxRecordDecl(isNotTriviallyCopyable()));27 const auto ArrayOfNotTriviallyCopyable =28 arrayType(hasElementType(HasNotTriviallyCopyableDecl));29 const auto NotTriviallyCopyableObject = hasType(hasCanonicalType(30 anyOf(pointsTo(qualType(anyOf(HasNotTriviallyCopyableDecl,31 ArrayOfNotTriviallyCopyable))),32 ArrayOfNotTriviallyCopyable)));33 34 // Check whether destination object is not TriviallyCopyable.35 // Applicable to all three memory manipulation functions.36 Finder->addMatcher(callExpr(callee(functionDecl(hasAnyName(37 "::memset", "::memcpy", "::memmove"))),38 hasArgument(0, NotTriviallyCopyableObject))39 .bind("dest"),40 this);41 42 // Check whether source object is not TriviallyCopyable.43 // Only applicable to memcpy() and memmove().44 Finder->addMatcher(45 callExpr(callee(functionDecl(hasAnyName("::memcpy", "::memmove"))),46 hasArgument(1, NotTriviallyCopyableObject))47 .bind("src"),48 this);49}50 51void UndefinedMemoryManipulationCheck::check(52 const MatchFinder::MatchResult &Result) {53 if (const auto *Call = Result.Nodes.getNodeAs<CallExpr>("dest")) {54 QualType DestType = Call->getArg(0)->IgnoreImplicit()->getType();55 if (!DestType->getPointeeType().isNull())56 DestType = DestType->getPointeeType();57 diag(Call->getBeginLoc(), "undefined behavior, destination object type %0 "58 "is not TriviallyCopyable")59 << DestType;60 }61 if (const auto *Call = Result.Nodes.getNodeAs<CallExpr>("src")) {62 QualType SourceType = Call->getArg(1)->IgnoreImplicit()->getType();63 if (!SourceType->getPointeeType().isNull())64 SourceType = SourceType->getPointeeType();65 diag(Call->getBeginLoc(),66 "undefined behavior, source object type %0 is not TriviallyCopyable")67 << SourceType;68 }69}70 71} // namespace clang::tidy::bugprone72