1  /*
 2   * Copyright (C) 2015-2019 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 "Exception.h"
28  
29  #include "Interpreter.h"
30  #include "JSCJSValueInlines.h"
31  #include "JSObjectInlines.h"
32  #include "StructureInlines.h"
33  
34  namespace JSC {
35  
36  const ClassInfo Exception::s_info = { "Exception", nullptr, nullptr, nullptr, CREATE_METHOD_TABLE(Exception) };
37  
38  Exception* Exception::create(VM& vm, JSValue thrownValue, StackCaptureAction action)
39  {
40      Exception* result = new (NotNull, allocateCell<Exception>(vm.heap)) Exception(vm);
41      result->finishCreation(vm, thrownValue, action);
42      return result;
43  }
44  
45  void Exception::destroy(JSCell* cell)
46  {
47      Exception* exception = static_cast<Exception*>(cell);
48      exception->~Exception();
49  }
50  
51  Structure* Exception::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
52  {
53      return Structure::create(vm, globalObject, prototype, TypeInfo(CellType, StructureFlags), info());
54  }
55  
56  void Exception::visitChildren(JSCell* cell, SlotVisitor& visitor)
57  {
58      Exception* thisObject = jsCast<Exception*>(cell);
59      ASSERT_GC_OBJECT_INHERITS(thisObject, info());
60      Base::visitChildren(thisObject, visitor);
61  
62      visitor.append(thisObject->m_value);
63      for (StackFrame& frame : thisObject->m_stack)
64          frame.visitChildren(visitor);
65  }
66  
67  Exception::Exception(VM& vm)
68      : Base(vm, vm.exceptionStructure.get())
69  {
70  }
71  
72  Exception::~Exception()
73  {
74  }
75  
76  void Exception::finishCreation(VM& vm, JSValue thrownValue, StackCaptureAction action)
77  {
78      Base::finishCreation(vm);
79  
80      m_value.set(vm, this, thrownValue);
81  
82      Vector<StackFrame> stackTrace;
83      if (action == StackCaptureAction::CaptureStack)
84          vm.interpreter->getStackTrace(this, stackTrace, 0, Options::exceptionStackTraceLimit());
85      m_stack = WTFMove(stackTrace);
86  }
87  
88  } // namespace JSC