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      1 /*
      2  * Copyright (c) 2010 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 "ScriptCallStackFactory.h"
     33 
     34 #include "InspectorValues.h"
     35 #include "ScriptArguments.h"
     36 #include "ScriptCallFrame.h"
     37 #include "ScriptCallStack.h"
     38 #include "ScriptScope.h"
     39 #include "ScriptValue.h"
     40 #include "V8Binding.h"
     41 
     42 #include <v8-debug.h>
     43 
     44 namespace WebCore {
     45 
     46 static ScriptCallFrame toScriptCallFrame(v8::Handle<v8::StackFrame> frame)
     47 {
     48     String sourceName;
     49     v8::Local<v8::String> sourceNameValue(frame->GetScriptNameOrSourceURL());
     50     if (!sourceNameValue.IsEmpty())
     51         sourceName = toWebCoreString(sourceNameValue);
     52 
     53     String functionName;
     54     v8::Local<v8::String> functionNameValue(frame->GetFunctionName());
     55     if (!functionNameValue.IsEmpty())
     56         functionName = toWebCoreString(functionNameValue);
     57 
     58     int sourceLineNumber = frame->GetLineNumber();
     59     int sourceColumn = frame->GetColumn();
     60     return ScriptCallFrame(functionName, sourceName, sourceLineNumber, sourceColumn);
     61 }
     62 
     63 static void toScriptCallFramesVector(v8::Handle<v8::StackTrace> stackTrace, Vector<ScriptCallFrame>& scriptCallFrames, size_t maxStackSize, bool emptyStackIsAllowed)
     64 {
     65     ASSERT(v8::Context::InContext());
     66     int frameCount = stackTrace->GetFrameCount();
     67     if (frameCount > static_cast<int>(maxStackSize))
     68         frameCount = maxStackSize;
     69     for (int i = 0; i < frameCount; i++) {
     70         v8::Local<v8::StackFrame> stackFrame = stackTrace->GetFrame(i);
     71         scriptCallFrames.append(toScriptCallFrame(stackFrame));
     72     }
     73     if (!frameCount && !emptyStackIsAllowed) {
     74         // Successfully grabbed stack trace, but there are no frames. It may happen in case
     75         // when a bound function is called from native code for example.
     76         // Fallback to setting lineNumber to 0, and source and function name to "undefined".
     77         scriptCallFrames.append(ScriptCallFrame("undefined", "undefined", 0));
     78     }
     79 }
     80 
     81 static PassRefPtr<ScriptCallStack> createScriptCallStack(v8::Handle<v8::StackTrace> stackTrace, size_t maxStackSize, bool emptyStackIsAllowed)
     82 {
     83     ASSERT(v8::Context::InContext());
     84     v8::HandleScope scope;
     85     Vector<ScriptCallFrame> scriptCallFrames;
     86     toScriptCallFramesVector(stackTrace, scriptCallFrames, maxStackSize, emptyStackIsAllowed);
     87     return ScriptCallStack::create(scriptCallFrames);
     88 }
     89 
     90 PassRefPtr<ScriptCallStack> createScriptCallStack(v8::Handle<v8::StackTrace> stackTrace, size_t maxStackSize)
     91 {
     92     return createScriptCallStack(stackTrace, maxStackSize, true);
     93 }
     94 
     95 PassRefPtr<ScriptCallStack> createScriptCallStack(size_t maxStackSize, bool emptyStackIsAllowed)
     96 {
     97     if (!v8::Context::InContext())
     98         return 0;
     99     v8::HandleScope handleScope;
    100     v8::Handle<v8::StackTrace> stackTrace(v8::StackTrace::CurrentStackTrace(maxStackSize, stackTraceOptions));
    101     return createScriptCallStack(stackTrace, maxStackSize, emptyStackIsAllowed);
    102 }
    103 
    104 PassRefPtr<ScriptArguments> createScriptArguments(const v8::Arguments& v8arguments, unsigned skipArgumentCount)
    105 {
    106     v8::HandleScope scope;
    107     v8::Local<v8::Context> context = v8::Context::GetCurrent();
    108     ScriptState* state = ScriptState::forContext(context);
    109 
    110     Vector<ScriptValue> arguments;
    111     for (int i = skipArgumentCount; i < v8arguments.Length(); ++i)
    112         arguments.append(ScriptValue(v8arguments[i]));
    113 
    114     return ScriptArguments::create(state, arguments);
    115 }
    116 
    117 } // namespace WebCore
    118