1*fb0ef6b6SCarlos Galvez //===--- BitwisePointerCastCheck.cpp - clang-tidy -------------------------===// 2*fb0ef6b6SCarlos Galvez // 3*fb0ef6b6SCarlos Galvez // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*fb0ef6b6SCarlos Galvez // See https://llvm.org/LICENSE.txt for license information. 5*fb0ef6b6SCarlos Galvez // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*fb0ef6b6SCarlos Galvez // 7*fb0ef6b6SCarlos Galvez //===----------------------------------------------------------------------===// 8*fb0ef6b6SCarlos Galvez 9*fb0ef6b6SCarlos Galvez #include "BitwisePointerCastCheck.h" 10*fb0ef6b6SCarlos Galvez #include "clang/ASTMatchers/ASTMatchFinder.h" 11*fb0ef6b6SCarlos Galvez 12*fb0ef6b6SCarlos Galvez using namespace clang::ast_matchers; 13*fb0ef6b6SCarlos Galvez 14*fb0ef6b6SCarlos Galvez namespace clang::tidy::bugprone { 15*fb0ef6b6SCarlos Galvez 16*fb0ef6b6SCarlos Galvez void BitwisePointerCastCheck::registerMatchers(MatchFinder *Finder) { 17*fb0ef6b6SCarlos Galvez if (getLangOpts().CPlusPlus20) { 18*fb0ef6b6SCarlos Galvez auto IsPointerType = refersToType(qualType(isAnyPointer())); 19*fb0ef6b6SCarlos Galvez Finder->addMatcher(callExpr(hasDeclaration(functionDecl(allOf( 20*fb0ef6b6SCarlos Galvez hasName("::std::bit_cast"), 21*fb0ef6b6SCarlos Galvez hasTemplateArgument(0, IsPointerType), 22*fb0ef6b6SCarlos Galvez hasTemplateArgument(1, IsPointerType))))) 23*fb0ef6b6SCarlos Galvez .bind("bit_cast"), 24*fb0ef6b6SCarlos Galvez this); 25*fb0ef6b6SCarlos Galvez } 26*fb0ef6b6SCarlos Galvez 27*fb0ef6b6SCarlos Galvez auto IsDoublePointerType = 28*fb0ef6b6SCarlos Galvez hasType(qualType(pointsTo(qualType(isAnyPointer())))); 29*fb0ef6b6SCarlos Galvez Finder->addMatcher(callExpr(hasArgument(0, IsDoublePointerType), 30*fb0ef6b6SCarlos Galvez hasArgument(1, IsDoublePointerType), 31*fb0ef6b6SCarlos Galvez hasDeclaration(functionDecl(hasName("::memcpy")))) 32*fb0ef6b6SCarlos Galvez .bind("memcpy"), 33*fb0ef6b6SCarlos Galvez this); 34*fb0ef6b6SCarlos Galvez } 35*fb0ef6b6SCarlos Galvez 36*fb0ef6b6SCarlos Galvez void BitwisePointerCastCheck::check(const MatchFinder::MatchResult &Result) { 37*fb0ef6b6SCarlos Galvez if (const auto *Call = Result.Nodes.getNodeAs<CallExpr>("bit_cast")) 38*fb0ef6b6SCarlos Galvez diag(Call->getBeginLoc(), 39*fb0ef6b6SCarlos Galvez "do not use 'std::bit_cast' to cast between pointers") 40*fb0ef6b6SCarlos Galvez << Call->getSourceRange(); 41*fb0ef6b6SCarlos Galvez else if (const auto *Call = Result.Nodes.getNodeAs<CallExpr>("memcpy")) 42*fb0ef6b6SCarlos Galvez diag(Call->getBeginLoc(), "do not use 'memcpy' to cast between pointers") 43*fb0ef6b6SCarlos Galvez << Call->getSourceRange(); 44*fb0ef6b6SCarlos Galvez } 45*fb0ef6b6SCarlos Galvez 46*fb0ef6b6SCarlos Galvez } // namespace clang::tidy::bugprone 47