InjectedScriptBase.cpp   [plain text]

/*
 * Copyright (C) 2013 Apple Inc. All rights reserved.
 * Copyright (C) 2012 Google Inc. 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 "InjectedScriptBase.h"

#include "DebuggerEvalEnabler.h"
#include "InspectorValues.h"
#include "JSCInlines.h"
#include "JSGlobalObject.h"
#include "ScriptFunctionCall.h"
#include <wtf/text/WTFString.h>

namespace Inspector {

InjectedScriptBase::InjectedScriptBase(const String& name)
    : m_name(name)
    , m_environment(nullptr)
{
}

InjectedScriptBase::InjectedScriptBase(const String& name, Deprecated::ScriptObject injectedScriptObject, InspectorEnvironment* environment)
    : m_name(name)
    , m_injectedScriptObject(injectedScriptObject)
    , m_environment(environment)
{
}

InjectedScriptBase::~InjectedScriptBase()
{
}

bool InjectedScriptBase::hasAccessToInspectedScriptState() const
{
    return m_environment && m_environment->canAccessInspectedScriptState(m_injectedScriptObject.scriptState());
}

const Deprecated::ScriptObject& InjectedScriptBase::injectedScriptObject() const
{
    return m_injectedScriptObject;
}

JSC::JSValue InjectedScriptBase::callFunctionWithEvalEnabled(Deprecated::ScriptFunctionCall& function, bool& hadException) const
{
    JSC::ExecState* scriptState = m_injectedScriptObject.scriptState();
    JSC::DebuggerEvalEnabler evalEnabler(scriptState);
    return function.call(hadException);
}

void InjectedScriptBase::makeCall(Deprecated::ScriptFunctionCall& function, RefPtr<InspectorValue>* result)
{
    if (hasNoValue() || !hasAccessToInspectedScriptState()) {
        *result = InspectorValue::null();
        return;
    }

    bool hadException = false;
    auto resultValue = callFunctionWithEvalEnabled(function, hadException);

    ASSERT(!hadException);
    if (!hadException) {
        *result = toInspectorValue(*m_injectedScriptObject.scriptState(), resultValue);
        if (!*result)
            *result = InspectorValue::create(String::format("Object has too long reference chain (must not be longer than %d)", InspectorValue::maxDepth));
    } else
        *result = InspectorValue::create("Exception while making a call.");
}

void InjectedScriptBase::makeEvalCall(ErrorString& errorString, Deprecated::ScriptFunctionCall& function, RefPtr<Protocol::Runtime::RemoteObject>* objectResult, Protocol::OptOutput<bool>* wasThrown, Protocol::OptOutput<int>* savedResultIndex)
{
    RefPtr<InspectorValue> result;
    makeCall(function, &result);
    if (!result) {
        errorString = ASCIILiteral("Internal error: result value is empty");
        return;
    }

    if (result->type() == InspectorValue::Type::String) {
        result->asString(errorString);
        ASSERT(errorString.length());
        return;
    }

    RefPtr<InspectorObject> resultTuple;
    if (!result->asObject(resultTuple)) {
        errorString = ASCIILiteral("Internal error: result is not an Object");
        return;
    }

    RefPtr<InspectorObject> resultObject;
    if (!resultTuple->getObject(ASCIILiteral("result"), resultObject)) {
        errorString = ASCIILiteral("Internal error: result is not a pair of value and wasThrown flag");
        return;
    }

    bool wasThrownValue = false;
    if (!resultTuple->getBoolean(ASCIILiteral("wasThrown"), wasThrownValue)) {
        errorString = ASCIILiteral("Internal error: result is not a pair of value and wasThrown flag");
        return;
    }

    *objectResult = BindingTraits<Protocol::Runtime::RemoteObject>::runtimeCast(resultObject);
    *wasThrown = wasThrownValue;

    if (savedResultIndex) {
        int savedIndex = 0;
        if (resultTuple->getInteger(ASCIILiteral("savedResultIndex"), savedIndex))
            *savedResultIndex = savedIndex;
    }
}

} // namespace Inspector