1/*
2 * Copyright (C) 2016-2017 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "ExceptionScope.h"
28
29#include "Exception.h"
30#include "ExceptionHelpers.h"
31#include <wtf/StackTrace.h>
32#include <wtf/StringPrintStream.h>
33#include <wtf/Threading.h>
34
35namespace JSC {
36
37#if ENABLE(EXCEPTION_SCOPE_VERIFICATION)
38
39ExceptionScope::ExceptionScope(VM& vm, ExceptionEventLocation location)
40 : m_vm(vm)
41 , m_previousScope(vm.m_topExceptionScope)
42 , m_location(location)
43 , m_recursionDepth(m_previousScope ? m_previousScope->m_recursionDepth + 1 : 0)
44{
45 m_vm.m_topExceptionScope = this;
46}
47
48ExceptionScope::~ExceptionScope()
49{
50 RELEASE_ASSERT(m_vm.m_topExceptionScope);
51 m_vm.m_topExceptionScope = m_previousScope;
52}
53
54CString ExceptionScope::unexpectedExceptionMessage()
55{
56 StringPrintStream out;
57
58 out.println("Unexpected exception observed on thread ", Thread::current(), " at:");
59 auto currentStack = StackTrace::captureStackTrace(Options::unexpectedExceptionStackTraceLimit(), 1);
60 currentStack->dump(out, " ");
61
62 if (!m_vm.nativeStackTraceOfLastThrow())
63 return CString();
64
65 out.println("The exception was thrown from thread ", *m_vm.throwingThread(), " at:");
66 m_vm.nativeStackTraceOfLastThrow()->dump(out, " ");
67
68 return out.toCString();
69}
70
71#endif // ENABLE(EXCEPTION_SCOPE_VERIFICATION)
72
73} // namespace JSC
74