================
@@ -0,0 +1,32 @@
+//===--- BitCastPointersCheck.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 "BitCastPointersCheck.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang::tidy::bugprone {
+
+void BitCastPointersCheck::registerMatchers(MatchFinder *Finder) {
+ auto IsPointerType = refersToType(qualType(isAnyPointer()));
+ Finder->addMatcher(callExpr(callee(functionDecl(allOf(
+ hasName("::std::bit_cast"),
+ hasTemplateArgument(0, IsPointerType),
+ hasTemplateArgument(1, IsPointerType)))))
+ .bind("x"),
+ this);
----------------
5chmidti wrote:
Note that this check will currently not detect when the source and target types
are structs that contain pointer types:
```c++
struct A {
uint64_t* ptr;
};
struct B {
double* ptr;
};
A a{};
std::bit_cast<B>(a);
```
As was pointed out in `r0 -> r1` of the paper:
> The pointer-forbidding logic was removed. It was initially there to help
> developers when a better tool is available, but it’s easily worked around
> (e.g. with a struct containing a pointer).
https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0476r2.html
https://github.com/llvm/llvm-project/pull/108083
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