JavaScriptCore-7600.1.4.9.tar.gz

[apple/javascriptcore.git] / inspector / ScriptCallStackFactory.cpp

diff --git a/inspector/ScriptCallStackFactory.cpp b/inspector/ScriptCallStackFactory.cpp
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+/*
+ * Copyright (C) 2014 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 "JSCJSValue.h"
+#include "JSCInlines.h"
+#include "ScriptArguments.h"
+#include "ScriptCallFrame.h"
+#include "ScriptCallStack.h"
+#include "ScriptValue.h"
+#include "StackVisitor.h"
+#include <wtf/RefCountedArray.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)
+    {
+        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(), line, column));
+
+            m_remainingCapacityForFrameCapture--;
+            return StackVisitor::Continue;
+        }
+
+        return StackVisitor::Done;
+    }
+
+private:
+    bool m_needToSkipAFrame;
+    Vector<ScriptCallFrame>& m_frames;
+    size_t m_remainingCapacityForFrameCapture;
+};
+
+PassRefPtr<ScriptCallStack> createScriptCallStack(JSC::ExecState* exec, size_t maxStackSize)
+{
+    if (!exec)
+        return ScriptCallStack::create();
+
+    Vector<ScriptCallFrame> frames;
+
+    CallFrame* frame = exec->vm().topCallFrame;
+    CreateScriptCallStackFunctor functor(false, frames, maxStackSize);
+    frame->iterate(functor);
+
+    return ScriptCallStack::create(frames);
+}
+
+PassRefPtr<ScriptCallStack> createScriptCallStackForConsole(JSC::ExecState* exec, size_t maxStackSize)
+{
+    if (!exec)
+        return ScriptCallStack::create();
+
+    Vector<ScriptCallFrame> frames;
+
+    CallFrame* frame = exec->vm().topCallFrame;
+    CreateScriptCallStackFunctor functor(true, frames, maxStackSize);
+    frame->iterate(functor);
+
+    if (frames.isEmpty()) {
+        CreateScriptCallStackFunctor functor(false, frames, maxStackSize);
+        frame->iterate(functor);
+    }
+
+    return ScriptCallStack::create(frames);
+}
+
+static void extractSourceInformationFromException(JSC::ExecState* exec, JSObject* exceptionObject, int* lineNumber, int* columnNumber, String* sourceURL)
+{
+    // FIXME: <http://webkit.org/b/115087> Web Inspector: Should not need to evaluate JavaScript handling exceptions
+    JSValue lineValue = exceptionObject->getDirect(exec->vm(), Identifier(exec, "line"));
+    *lineNumber = lineValue && lineValue.isNumber() ? int(lineValue.toNumber(exec)) : 0;
+    JSValue columnValue = exceptionObject->getDirect(exec->vm(), Identifier(exec, "column"));
+    *columnNumber = columnValue && columnValue.isNumber() ? int(columnValue.toNumber(exec)) : 0;
+    JSValue sourceURLValue = exceptionObject->getDirect(exec->vm(), Identifier(exec, "sourceURL"));
+    *sourceURL = sourceURLValue && sourceURLValue.isString() ? sourceURLValue.toString(exec)->value(exec) : String("undefined");
+    exec->clearException();
+}
+
+PassRefPtr<ScriptCallStack> createScriptCallStackFromException(JSC::ExecState* exec, JSC::JSValue& exception, size_t maxStackSize)
+{
+    Vector<ScriptCallFrame> frames;
+    RefCountedArray<StackFrame> stackTrace = exec->vm().exceptionStack();
+    for (size_t i = 0; i < stackTrace.size() && i < maxStackSize; i++) {
+        unsigned line;
+        unsigned column;
+        stackTrace[i].computeLineAndColumn(line, column);
+        String functionName = stackTrace[i].friendlyFunctionName(exec);
+        frames.append(ScriptCallFrame(functionName, stackTrace[i].friendlySourceURL(), line, column));
+    }
+
+    // Fallback to getting at least the line and sourceURL from the exception object if it has values and the exceptionStack doesn't.
+    JSObject* exceptionObject = exception.toObject(exec);
+    if (exception.isObject()) {
+        int lineNumber;
+        int columnNumber;
+        String exceptionSourceURL;
+        if (!frames.size()) {
+            extractSourceInformationFromException(exec, exceptionObject, &lineNumber, &columnNumber, &exceptionSourceURL);
+            frames.append(ScriptCallFrame(String(), exceptionSourceURL, lineNumber, columnNumber));
+        } else {
+            if (stackTrace[0].sourceURL.isEmpty()) {
+                const ScriptCallFrame& firstCallFrame = frames.first();
+                extractSourceInformationFromException(exec, exceptionObject, &lineNumber, &columnNumber, &exceptionSourceURL);
+                frames[0] = ScriptCallFrame(firstCallFrame.functionName(), exceptionSourceURL, lineNumber, columnNumber);
+            }
+        }
+    }
+
+    return ScriptCallStack::create(frames);
+}
+
+PassRefPtr<ScriptArguments> createScriptArguments(JSC::ExecState* exec, unsigned skipArgumentCount)
+{
+    Vector<Deprecated::ScriptValue> arguments;
+    size_t argumentCount = exec->argumentCount();
+    for (size_t i = skipArgumentCount; i < argumentCount; ++i)
+        arguments.append(Deprecated::ScriptValue(exec->vm(), exec->uncheckedArgument(i)));
+    return ScriptArguments::create(exec, arguments);
+}
+
+} // namespace Inspector