From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- js/src/jsapi-tests/hidePointer.cpp | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 js/src/jsapi-tests/hidePointer.cpp (limited to 'js/src/jsapi-tests/hidePointer.cpp') diff --git a/js/src/jsapi-tests/hidePointer.cpp b/js/src/jsapi-tests/hidePointer.cpp new file mode 100644 index 0000000000..144c890359 --- /dev/null +++ b/js/src/jsapi-tests/hidePointer.cpp @@ -0,0 +1,25 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * vim: set ts=8 sts=2 et sw=2 tw=80: + */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "mozilla/Atomics.h" + +// This is an attempt to hide pointer values from the C++ compiler. This might +// not stand up in the presence of PGO but that's probably not important. + +// g_hidden_pointer is public so that it's limited what the compiler can assume +// about it, and atomic so that we don't run afoul of the compiler's UB +// analysis. + +mozilla::Atomic g_hidden_pointer; + +// Call this to install a pointer into the global. + +MOZ_NEVER_INLINE void setHiddenPointer(void* p) { g_hidden_pointer = p; } + +// Call this to retrieve the pointer. + +MOZ_NEVER_INLINE void* getHiddenPointer() { return g_hidden_pointer; } -- cgit v1.2.3