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From 0164c09d4025df2bd1a42f14de29166aa0e7ac7a Mon Sep 17 00:00:00 2001
From: Richard Lau <rlau@redhat.com>
Date: Wed, 26 Apr 2023 15:46:00 -0400
Subject: [PATCH] deps: V8: cherry-pick c5ab3e4f0c5a
Original commit message:
libstdc++: fix incomplete type in v8::internal::is_subtype<T, U>
Using std::convertible with incomplete types is UB. However, till
GCC 12 it was accepted and std::convertible returned false.
This fails now for e.g. v8::internal::WasmArray. Use
std::disjunction and std::conjunction instead which are short-
circuiting, because std::is_base_of<T, T> is already true.
Bug: chromium:957519
Change-Id: Ia26643dbdf0fb00d5586c71ae6b18e8d0f3cf96e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4394663
Commit-Queue: Stephan Hartmann <stha09@googlemail.com>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#86904}
Refs: https://github.com/v8/v8/commit/c5ab3e4f0c5a3ce880941184ef8447c27cd19a93
---
common.gypi | 2 +-
deps/v8/src/codegen/tnode.h | 5 +++--
2 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/deps/v8/src/codegen/tnode.h b/deps/v8/src/codegen/tnode.h
index cd7bd8db98c24..7629e89ad693f 100644
--- a/deps/v8/src/codegen/tnode.h
+++ b/deps/v8/src/codegen/tnode.h
@@ -269,8 +269,9 @@ using BuiltinPtr = Smi;
template <class T, class U>
struct is_subtype {
static const bool value =
- std::is_base_of<U, T>::value || (std::is_same<U, MaybeObject>::value &&
- std::is_convertible<T, Object>::value);
+ std::disjunction<std::is_base_of<U, T>,
+ std::conjunction<std::is_same<U, MaybeObject>,
+ std::is_convertible<T, Object>>>::value;
};
template <class T1, class T2, class U>
struct is_subtype<UnionT<T1, T2>, U> {
|
