1 //===--- BitwisePointerCastCheck.cpp - clang-tidy -------------------------===// 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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "BitwisePointerCastCheck.h" 10 #include "clang/ASTMatchers/ASTMatchFinder.h" 11 12 using namespace clang::ast_matchers; 13 14 namespace clang::tidy::bugprone { 15 16 void BitwisePointerCastCheck::registerMatchers(MatchFinder *Finder) { 17 if (getLangOpts().CPlusPlus20) { 18 auto IsPointerType = refersToType(qualType(isAnyPointer())); 19 Finder->addMatcher(callExpr(hasDeclaration(functionDecl(allOf( 20 hasName("::std::bit_cast"), 21 hasTemplateArgument(0, IsPointerType), 22 hasTemplateArgument(1, IsPointerType))))) 23 .bind("bit_cast"), 24 this); 25 } 26 27 auto IsDoublePointerType = 28 hasType(qualType(pointsTo(qualType(isAnyPointer())))); 29 Finder->addMatcher(callExpr(hasArgument(0, IsDoublePointerType), 30 hasArgument(1, IsDoublePointerType), 31 hasDeclaration(functionDecl(hasName("::memcpy")))) 32 .bind("memcpy"), 33 this); 34 } 35 36 void BitwisePointerCastCheck::check(const MatchFinder::MatchResult &Result) { 37 if (const auto *Call = Result.Nodes.getNodeAs<CallExpr>("bit_cast")) 38 diag(Call->getBeginLoc(), 39 "do not use 'std::bit_cast' to cast between pointers") 40 << Call->getSourceRange(); 41 else if (const auto *Call = Result.Nodes.getNodeAs<CallExpr>("memcpy")) 42 diag(Call->getBeginLoc(), "do not use 'memcpy' to cast between pointers") 43 << Call->getSourceRange(); 44 } 45 46 } // namespace clang::tidy::bugprone 47