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Issue 2744383002: Revert of [wasm] Initial signal handler (Closed)
Patch Set: Created 3 years, 9 months ago
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1 // Copyright 2017 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 // PLEASE READ BEFORE CHANGING THIS FILE!
6 //
7 // This file contains code that is used both inside and outside the out of
8 // bounds signal handler. Because this code runs in a signal handler context,
9 // use extra care when modifying this file. Here are some rules to follow.
10 //
11 // 1. Do not introduce any new external dependencies. This file needs
12 // to be self contained so it is easy to audit everything that a
13 // signal handler might do.
14 //
15 // 2. Any changes must be reviewed by someone from the crash reporting
16 // or security team. See OWNERS for suggested reviewers.
17 //
18 // For more information, see https://goo.gl/yMeyUY.
19
20 #include "src/trap-handler/trap-handler-internal.h"
21
22 namespace v8 {
23 namespace internal {
24 namespace trap_handler {
25
26 THREAD_LOCAL bool g_thread_in_wasm_code = false;
27
28 size_t gNumCodeObjects = 0;
29 CodeProtectionInfoListEntry* gCodeObjects = nullptr;
30
31 std::atomic_flag MetadataLock::spinlock_ = ATOMIC_FLAG_INIT;
32
33 MetadataLock::MetadataLock() {
34 if (g_thread_in_wasm_code) {
35 abort();
36 }
37
38 while (spinlock_.test_and_set(std::memory_order::memory_order_acquire)) {
39 }
40 }
41
42 MetadataLock::~MetadataLock() {
43 if (g_thread_in_wasm_code) {
44 abort();
45 }
46
47 spinlock_.clear(std::memory_order::memory_order_release);
48 }
49
50 } // namespace trap_handler
51 } // namespace internal
52 } // namespace v8
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