Source/JavaScriptCore/inspector/ScriptCallStackFactory.cpp - WebKit - Git at Google

 /*
  * Copyright (C) 2014, 2016 Apple Inc. All rights reserved.
  * Copyright (c) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2012 Research In Motion Limited. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #include "config.h"
 #include "ScriptCallStackFactory.h"

 #include "CallFrame.h"
 #include "CatchScope.h"
 #include "CodeBlock.h"
 #include "Exception.h"
 #include "JSCJSValue.h"
 #include "JSCInlines.h"
 #include "ScriptArguments.h"
 #include "ScriptCallFrame.h"
 #include "StackVisitor.h"
 #include <wtf/text/WTFString.h>

 using namespace JSC;

 namespace Inspector {

 class CreateScriptCallStackFunctor {
 public:
     CreateScriptCallStackFunctor(bool needToSkipAFrame, Vector<ScriptCallFrame>& frames, size_t remainingCapacity)
         : m_needToSkipAFrame(needToSkipAFrame)
         , m_frames(frames)
         , m_remainingCapacityForFrameCapture(remainingCapacity)
     {
     }

     StackVisitor::Status operator()(StackVisitor& visitor) const
     {
         if (m_needToSkipAFrame) {
             m_needToSkipAFrame = false;
             return StackVisitor::Continue;
         }

         if (m_remainingCapacityForFrameCapture) {
             unsigned line;
             unsigned column;
             visitor->computeLineAndColumn(line, column);
             m_frames.append(ScriptCallFrame(visitor->functionName(), visitor->sourceURL(), static_cast<SourceID>(visitor->sourceID()), line, column));

             m_remainingCapacityForFrameCapture--;
             return StackVisitor::Continue;
         }

         return StackVisitor::Done;
     }

 private:
     mutable bool m_needToSkipAFrame;
     Vector<ScriptCallFrame>& m_frames;
     mutable size_t m_remainingCapacityForFrameCapture;
 };

 Ref<ScriptCallStack> createScriptCallStack(JSC::ExecState* exec, size_t maxStackSize)
 {
     if (!exec)
         return ScriptCallStack::create();

     JSLockHolder locker(exec);
     Vector<ScriptCallFrame> frames;

     CallFrame* frame = exec->vm().topCallFrame;
     if (!frame)
         return ScriptCallStack::create();
     CreateScriptCallStackFunctor functor(false, frames, maxStackSize);
     frame->iterate(functor);

     return ScriptCallStack::create(frames);
 }

 Ref<ScriptCallStack> createScriptCallStackForConsole(JSC::ExecState* exec, size_t maxStackSize)
 {
     if (!exec)
         return ScriptCallStack::create();

     JSLockHolder locker(exec);
     Vector<ScriptCallFrame> frames;

     CallFrame* frame = exec->vm().topCallFrame;
     if (!frame)
         return ScriptCallStack::create();
     CreateScriptCallStackFunctor functor(true, frames, maxStackSize);
     frame->iterate(functor);

     if (frames.isEmpty()) {
         CreateScriptCallStackFunctor functor(false, frames, maxStackSize);
         frame->iterate(functor);
     }

     return ScriptCallStack::create(frames);
 }

 static bool extractSourceInformationFromException(JSC::ExecState* exec, JSObject* exceptionObject, int* lineNumber, int* columnNumber, String* sourceURL)
 {
     VM& vm = exec->vm();
     auto scope = DECLARE_CATCH_SCOPE(vm);

     // FIXME: <http://webkit.org/b/115087> Web Inspector: Should not need to evaluate JavaScript handling exceptions
     JSValue lineValue = exceptionObject->getDirect(vm, Identifier::fromString(exec, "line"));
     JSValue columnValue = exceptionObject->getDirect(vm, Identifier::fromString(exec, "column"));
     JSValue sourceURLValue = exceptionObject->getDirect(vm, Identifier::fromString(exec, "sourceURL"));

     bool result = false;
     if (lineValue && lineValue.isNumber()
         && sourceURLValue && sourceURLValue.isString()) {
         *lineNumber = int(lineValue.toNumber(exec));
         *columnNumber = columnValue && columnValue.isNumber() ? int(columnValue.toNumber(exec)) : 0;
         *sourceURL = sourceURLValue.toWTFString(exec);
         result = true;
     } else if (ErrorInstance* error = jsDynamicCast<ErrorInstance*>(vm, exceptionObject)) {
         unsigned unsignedLine;
         unsigned unsignedColumn;
         result = getLineColumnAndSource(error->stackTrace(), unsignedLine, unsignedColumn, *sourceURL);
         *lineNumber = static_cast<int>(unsignedLine);
         *columnNumber = static_cast<int>(unsignedColumn);
     }

     if (sourceURL->isEmpty())
         *sourceURL = "undefined"_s;

     scope.clearException();
     return result;
 }

 Ref<ScriptCallStack> createScriptCallStackFromException(JSC::ExecState* exec, JSC::Exception* exception, size_t maxStackSize)
 {
     Vector<ScriptCallFrame> frames;
     auto& stackTrace = exception->stack();
     VM& vm = exec->vm();
     for (size_t i = 0; i < stackTrace.size() && i < maxStackSize; i++) {
         unsigned line;
         unsigned column;
         stackTrace[i].computeLineAndColumn(line, column);
         String functionName = stackTrace[i].functionName(vm);
         frames.append(ScriptCallFrame(functionName, stackTrace[i].sourceURL(), static_cast<SourceID>(stackTrace[i].sourceID()), line, column));
     }

     // Fallback to getting at least the line and sourceURL from the exception object if it has values and the exceptionStack doesn't.
     if (exception->value().isObject()) {
         JSObject* exceptionObject = exception->value().toObject(exec);
         ASSERT(exceptionObject);
         int lineNumber;
         int columnNumber;
         String exceptionSourceURL;
         if (!frames.size()) {
             if (extractSourceInformationFromException(exec, exceptionObject, &lineNumber, &columnNumber, &exceptionSourceURL))
                 frames.append(ScriptCallFrame(String(), exceptionSourceURL, noSourceID, lineNumber, columnNumber));
         } else {
             // FIXME: The typical stack trace will have a native frame at the top, and consumers of
             // this code already know this (see JSDOMExceptionHandling.cpp's reportException, for
             // example - it uses firstNonNativeCallFrame). This looks like it splats something else
             // over it. That something else is probably already at stackTrace[1].
             // https://bugs.webkit.org/show_bug.cgi?id=176663
             if (!stackTrace[0].hasLineAndColumnInfo() || stackTrace[0].sourceURL().isEmpty()) {
                 const ScriptCallFrame& firstCallFrame = frames.first();
                 if (extractSourceInformationFromException(exec, exceptionObject, &lineNumber, &columnNumber, &exceptionSourceURL))
                     frames[0] = ScriptCallFrame(firstCallFrame.functionName(), exceptionSourceURL, stackTrace[0].sourceID(), lineNumber, columnNumber);
             }
         }
     }

     return ScriptCallStack::create(frames);
 }

 Ref<ScriptArguments> createScriptArguments(JSC::ExecState* state, unsigned skipArgumentCount)
 {
     VM& vm = state->vm();
     Vector<JSC::Strong<JSC::Unknown>> arguments;
     size_t argumentCount = state->argumentCount();
     for (size_t i = skipArgumentCount; i < argumentCount; ++i)
         arguments.append({ vm, state->uncheckedArgument(i) });
     return ScriptArguments::create(*state, WTFMove(arguments));
 }

 } // namespace Inspector
	/*
	* Copyright (C) 2014, 2016 Apple Inc. All rights reserved.
	* Copyright (c) 2010 Google Inc. All rights reserved.
	* Copyright (C) 2012 Research In Motion Limited. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are
	* met:
	*
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above
	* copyright notice, this list of conditions and the following disclaimer
	* in the documentation and/or other materials provided with the
	* distribution.
	* * Neither the name of Google Inc. nor the names of its
	* contributors may be used to endorse or promote products derived from
	* this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include "config.h"
	#include "ScriptCallStackFactory.h"

	#include "CallFrame.h"
	#include "CatchScope.h"
	#include "CodeBlock.h"
	#include "Exception.h"
	#include "JSCJSValue.h"
	#include "JSCInlines.h"
	#include "ScriptArguments.h"
	#include "ScriptCallFrame.h"
	#include "StackVisitor.h"
	#include <wtf/text/WTFString.h>

	using namespace JSC;

	namespace Inspector {

	class CreateScriptCallStackFunctor {
	public:
	CreateScriptCallStackFunctor(bool needToSkipAFrame, Vector<ScriptCallFrame>& frames, size_t remainingCapacity)
	: m_needToSkipAFrame(needToSkipAFrame)
	, m_frames(frames)
	, m_remainingCapacityForFrameCapture(remainingCapacity)
	{
	}

	StackVisitor::Status operator()(StackVisitor& visitor) const
	{
	if (m_needToSkipAFrame) {
	m_needToSkipAFrame = false;
	return StackVisitor::Continue;
	}

	if (m_remainingCapacityForFrameCapture) {
	unsigned line;
	unsigned column;
	visitor->computeLineAndColumn(line, column);
	m_frames.append(ScriptCallFrame(visitor->functionName(), visitor->sourceURL(), static_cast<SourceID>(visitor->sourceID()), line, column));

	m_remainingCapacityForFrameCapture--;
	return StackVisitor::Continue;
	}

	return StackVisitor::Done;
	}

	private:
	mutable bool m_needToSkipAFrame;
	Vector<ScriptCallFrame>& m_frames;
	mutable size_t m_remainingCapacityForFrameCapture;
	};

	Ref<ScriptCallStack> createScriptCallStack(JSC::ExecState* exec, size_t maxStackSize)
	{
	if (!exec)
	return ScriptCallStack::create();

	JSLockHolder locker(exec);
	Vector<ScriptCallFrame> frames;

	CallFrame* frame = exec->vm().topCallFrame;
	if (!frame)
	return ScriptCallStack::create();
	CreateScriptCallStackFunctor functor(false, frames, maxStackSize);
	frame->iterate(functor);

	return ScriptCallStack::create(frames);
	}

	Ref<ScriptCallStack> createScriptCallStackForConsole(JSC::ExecState* exec, size_t maxStackSize)
	{
	if (!exec)
	return ScriptCallStack::create();

	JSLockHolder locker(exec);
	Vector<ScriptCallFrame> frames;

	CallFrame* frame = exec->vm().topCallFrame;
	if (!frame)
	return ScriptCallStack::create();
	CreateScriptCallStackFunctor functor(true, frames, maxStackSize);
	frame->iterate(functor);

	if (frames.isEmpty()) {
	CreateScriptCallStackFunctor functor(false, frames, maxStackSize);
	frame->iterate(functor);
	}

	return ScriptCallStack::create(frames);
	}

	static bool extractSourceInformationFromException(JSC::ExecState* exec, JSObject* exceptionObject, int* lineNumber, int* columnNumber, String* sourceURL)
	{
	VM& vm = exec->vm();
	auto scope = DECLARE_CATCH_SCOPE(vm);

	// FIXME: <http://webkit.org/b/115087> Web Inspector: Should not need to evaluate JavaScript handling exceptions
	JSValue lineValue = exceptionObject->getDirect(vm, Identifier::fromString(exec, "line"));
	JSValue columnValue = exceptionObject->getDirect(vm, Identifier::fromString(exec, "column"));
	JSValue sourceURLValue = exceptionObject->getDirect(vm, Identifier::fromString(exec, "sourceURL"));

	bool result = false;
	if (lineValue && lineValue.isNumber()
	&& sourceURLValue && sourceURLValue.isString()) {
	*lineNumber = int(lineValue.toNumber(exec));
	*columnNumber = columnValue && columnValue.isNumber() ? int(columnValue.toNumber(exec)) : 0;
	*sourceURL = sourceURLValue.toWTFString(exec);
	result = true;
	} else if (ErrorInstance* error = jsDynamicCast<ErrorInstance*>(vm, exceptionObject)) {
	unsigned unsignedLine;
	unsigned unsignedColumn;
	result = getLineColumnAndSource(error->stackTrace(), unsignedLine, unsignedColumn, *sourceURL);
	*lineNumber = static_cast<int>(unsignedLine);
	*columnNumber = static_cast<int>(unsignedColumn);
	}

	if (sourceURL->isEmpty())
	*sourceURL = "undefined"_s;

	scope.clearException();
	return result;
	}

	Ref<ScriptCallStack> createScriptCallStackFromException(JSC::ExecState* exec, JSC::Exception* exception, size_t maxStackSize)
	{
	Vector<ScriptCallFrame> frames;
	auto& stackTrace = exception->stack();
	VM& vm = exec->vm();
	for (size_t i = 0; i < stackTrace.size() && i < maxStackSize; i++) {
	unsigned line;
	unsigned column;
	stackTrace[i].computeLineAndColumn(line, column);
	String functionName = stackTrace[i].functionName(vm);
	frames.append(ScriptCallFrame(functionName, stackTrace[i].sourceURL(), static_cast<SourceID>(stackTrace[i].sourceID()), line, column));
	}

	// Fallback to getting at least the line and sourceURL from the exception object if it has values and the exceptionStack doesn't.
	if (exception->value().isObject()) {
	JSObject* exceptionObject = exception->value().toObject(exec);
	ASSERT(exceptionObject);
	int lineNumber;
	int columnNumber;
	String exceptionSourceURL;
	if (!frames.size()) {
	if (extractSourceInformationFromException(exec, exceptionObject, &lineNumber, &columnNumber, &exceptionSourceURL))
	frames.append(ScriptCallFrame(String(), exceptionSourceURL, noSourceID, lineNumber, columnNumber));
	} else {
	// FIXME: The typical stack trace will have a native frame at the top, and consumers of
	// this code already know this (see JSDOMExceptionHandling.cpp's reportException, for
	// example - it uses firstNonNativeCallFrame). This looks like it splats something else
	// over it. That something else is probably already at stackTrace[1].
	// https://bugs.webkit.org/show_bug.cgi?id=176663
	if (!stackTrace[0].hasLineAndColumnInfo() \|\| stackTrace[0].sourceURL().isEmpty()) {
	const ScriptCallFrame& firstCallFrame = frames.first();
	if (extractSourceInformationFromException(exec, exceptionObject, &lineNumber, &columnNumber, &exceptionSourceURL))
	frames[0] = ScriptCallFrame(firstCallFrame.functionName(), exceptionSourceURL, stackTrace[0].sourceID(), lineNumber, columnNumber);
	}
	}
	}

	return ScriptCallStack::create(frames);
	}

	Ref<ScriptArguments> createScriptArguments(JSC::ExecState* state, unsigned skipArgumentCount)
	{
	VM& vm = state->vm();
	Vector<JSC::Strong<JSC::Unknown>> arguments;
	size_t argumentCount = state->argumentCount();
	for (size_t i = skipArgumentCount; i < argumentCount; ++i)
	arguments.append({ vm, state->uncheckedArgument(i) });
	return ScriptArguments::create(*state, WTFMove(arguments));
	}

	} // namespace Inspector