================
@@ -1120,6 +1120,22 @@ class QualType {
/// Return true if this is a trivially copyable type (C++0x [basic.types]p9)
bool isTriviallyCopyableType(const ASTContext &Context) const;
+ /// Return true if the type is safe to bitwise copy using memcpy/memmove.
+ ///
+ /// This is an extension in clang: bitwise clonable types act as trivially
+ /// copyable types, meaning their underlying bytes can be safely copied by
+ /// memcpy or memmove. After the copy, the destination object has the same
+ /// object representation.
+ ///
+ /// However, there are cases where it is not safe to copy:
+ /// - When sanitizers, such as AddressSanitizer, add padding with poison,
+ /// which can cause issues if those poisoned padding bits are accessed.
+ /// - Types with Objective-C lifetimes, where specific runtime
+ /// semantics may not be preserved during a bitwise copy.
+ ///
+ // FIXME: each call will trigger a full computation, cache the result.
----------------
ilya-biryukov wrote:
NIT: move this FIXME into the implementation. I don't think it's relevant to
the public API contract of this method.
https://github.com/llvm/llvm-project/pull/86512
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