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//===--- BitwisePointerCastCheck.cpp - clang-tidy -------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "BitwisePointerCastCheck.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
using namespace clang::ast_matchers;
namespace clang::tidy::bugprone {
void BitwisePointerCastCheck::registerMatchers(MatchFinder *Finder) {
if (getLangOpts().CPlusPlus20) {
auto IsPointerType = refersToType(qualType(isAnyPointer()));
Finder->addMatcher(callExpr(hasDeclaration(functionDecl(allOf(
hasName("::std::bit_cast"),
hasTemplateArgument(0, IsPointerType),
hasTemplateArgument(1, IsPointerType)))))
.bind("bit_cast"),
this);
}
auto IsDoublePointerType =
hasType(qualType(pointsTo(qualType(isAnyPointer()))));
Finder->addMatcher(callExpr(hasArgument(0, IsDoublePointerType),
hasArgument(1, IsDoublePointerType),
hasDeclaration(functionDecl(hasName("::memcpy"))))
.bind("memcpy"),
this);
}
void BitwisePointerCastCheck::check(const MatchFinder::MatchResult &Result) {
if (const auto *Call = Result.Nodes.getNodeAs<CallExpr>("bit_cast"))
diag(Call->getBeginLoc(),
"do not use 'std::bit_cast' to cast between pointers")
<< Call->getSourceRange();
else if (const auto *Call = Result.Nodes.getNodeAs<CallExpr>("memcpy"))
diag(Call->getBeginLoc(), "do not use 'memcpy' to cast between pointers")
<< Call->getSourceRange();
}
} // namespace clang::tidy::bugprone
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