1 /*

     2  * Copyright (c) 2008, Google 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 are

     6  * met:

     7  * 

     8  *     * Redistributions of source code must retain the above copyright

     9  * notice, this list of conditions and the following disclaimer.

    10  *     * Redistributions in binary form must reproduce the above

    11  * copyright notice, this list of conditions and the following disclaimer

    12  * in the documentation and/or other materials provided with the

    13  * distribution.

    14  *     * Neither the name of Google Inc. nor the names of its

    15  * contributors may be used to endorse or promote products derived from

    16  * this software without specific prior written permission.

    17  * 

    18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

    19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

    20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

    21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

    22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

    23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

    24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

    25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

    26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

    28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    29  */

    30 

    31 #include "config.h"

    32 #include "ScriptCallStack.h"

    33 

    34 #include <interpreter/CallFrame.h>

    35 #include <interpreter/Interpreter.h>

    36 #include <runtime/JSFunction.h>

    37 #include <runtime/JSValue.h>

    38 #include <runtime/UString.h>

    39 #include <runtime/JSGlobalData.h>

    40 

    41 using namespace JSC;

    42 

    43 namespace WebCore {

    44 

    45 ScriptCallStack::ScriptCallStack(ExecState* exec, unsigned skipArgumentCount)

    46     : m_initialized(false)

    47     , m_exec(exec)

    48     , m_caller(0)

    49 {

    50     int signedLineNumber;

    51     intptr_t sourceID;

    52     UString urlString;

    53     JSValue function;

    54 

    55     exec->interpreter()->retrieveLastCaller(exec, signedLineNumber, sourceID, urlString, function);

    56 

    57     unsigned lineNumber = signedLineNumber >= 0 ? signedLineNumber : 0;

    58 

    59     if (function) {

    60         m_caller = asFunction(function);

    61         m_frames.append(ScriptCallFrame(m_caller->name(m_exec), urlString, lineNumber, m_exec, skipArgumentCount));

    62     } else {

    63         // Caller is unknown, but we should still add the frame, because

    64         // something called us, and gave us arguments.

    65         m_frames.append(ScriptCallFrame(UString(), urlString, lineNumber, m_exec, skipArgumentCount));

    66     }

    67 }

    68 

    69 ScriptCallStack::~ScriptCallStack()

    70 {

    71 }

    72 

    73 const ScriptCallFrame &ScriptCallStack::at(unsigned index)

    74 {

    75     // First frame is pre-populated in constructor, so don't trigger

    76     // initialization unless looking beyond the first frame.

    77     if (index > 0)

    78         initialize();

    79     ASSERT(m_frames.size() > index);

    80     return m_frames[index];

    81 }

    82 

    83 unsigned ScriptCallStack::size()

    84 {

    85     initialize();

    86     return m_frames.size();

    87 }

    88 

    89 void ScriptCallStack::initialize()

    90 {

    91     if (!m_caller || m_initialized)

    92         return;

    93 

    94     int signedLineNumber;

    95     intptr_t sourceID;

    96     UString urlString;

    97     JSValue function;

    98     // callFrame must exist if m_caller is not null.

    99     CallFrame* callFrame = m_exec->callerFrame();

   100     while (true) {

   101         ASSERT(callFrame);

   102         m_exec->interpreter()->retrieveLastCaller(callFrame, signedLineNumber, sourceID, urlString, function);

   103         if (!function)

   104             break;

   105         JSFunction* jsFunction = asFunction(function);

   106         unsigned lineNumber = signedLineNumber >= 0 ? signedLineNumber : 0;

   107         m_frames.append(ScriptCallFrame(jsFunction->name(m_exec), urlString, lineNumber, m_exec, 0));

   108         callFrame = callFrame->callerFrame();

   109     }

   110     m_initialized = true;

   111 }

   112 

   113 bool ScriptCallStack::stackTrace(int, const RefPtr<InspectorArray>&)

   114 {

   115     return false;

   116 }

   117 

   118 } // namespace WebCore