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 <wtf/StackTrace.h>
30  #include <wtf/StringPrintStream.h>
31  #include <wtf/Threading.h>
32  
33  namespace JSC {
34      
35  #if ENABLE(EXCEPTION_SCOPE_VERIFICATION)
36      
37  ExceptionScope::ExceptionScope(VM& vm, ExceptionEventLocation location)
38      : m_vm(vm)
39      , m_previousScope(vm.m_topExceptionScope)
40      , m_location(location)
41      , m_recursionDepth(m_previousScope ? m_previousScope->m_recursionDepth + 1 : 0)
42  {
43      m_vm.m_topExceptionScope = this;
44  }
45  
46  ExceptionScope::~ExceptionScope()
47  {
48      RELEASE_ASSERT(m_vm.m_topExceptionScope);
49      m_vm.m_topExceptionScope = m_previousScope;
50  }
51  
52  CString ExceptionScope::unexpectedExceptionMessage()
53  {
54      StringPrintStream out;
55  
56      out.println("Unexpected exception observed on thread ", Thread::current(), " at:");
57      auto currentStack = StackTrace::captureStackTrace(Options::unexpectedExceptionStackTraceLimit(), 1);
58      currentStack->dump(out, "    ");
59  
60      if (!m_vm.nativeStackTraceOfLastThrow())
61          return CString();
62      
63      out.println("The exception was thrown from thread ", *m_vm.throwingThread(), " at:");
64      m_vm.nativeStackTraceOfLastThrow()->dump(out, "    ");
65  
66      return out.toCString();
67  }
68  
69  #endif // ENABLE(EXCEPTION_SCOPE_VERIFICATION)
70      
71  } // namespace JSC