WebKit/Source/JavaScriptCore/inspector/InjectedScriptBase.cpp at main · WebKit/WebKit · GitHub

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* 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 "JSCInlines.h"

#include "JSGlobalObject.h"

#include "JSLock.h"

#include "JSNativeStdFunction.h"

#include "ScriptFunctionCall.h"

#include <wtf/JSONValues.h>

#include <wtf/text/MakeString.h>

namespace Inspector {

static RefPtr<JSON::Value> jsToInspectorValue(JSC::JSGlobalObject* globalObject, JSC::JSValue value, int maxDepth)

{

if (!value) {

ASSERT_NOT_REACHED();

return nullptr;

}

if (!maxDepth)

return nullptr;

maxDepth--;

if (value.isUndefinedOrNull())

return JSON::Value::null();

if (value.isBoolean())

return JSON::Value::create(value.asBoolean());

if (value.isDouble())

return JSON::Value::create(value.asDouble());

if (value.isInt32())

return JSON::Value::create(value.asInt32());

if (value.isString())

return JSON::Value::create(asString(value)->value(globalObject).data);

if (value.isObject()) {

if (isJSArray(value)) {

auto inspectorArray = JSON::Array::create();

auto& array = *asArray(value);

unsigned length = array.length();

for (unsigned i = 0; i < length; i++) {

auto elementValue = jsToInspectorValue(globalObject, array.getIndex(globalObject, i), maxDepth);

if (!elementValue)

return nullptr;

inspectorArray->pushValue(elementValue.releaseNonNull());

}

return inspectorArray;

}

JSC::VM& vm = globalObject->vm();

auto inspectorObject = JSON::Object::create();

auto& object = *value.getObject();

JSC::PropertyNameArrayBuilder propertyNames(vm, JSC::PropertyNameMode::Strings, JSC::PrivateSymbolMode::Exclude);

object.methodTable()->getOwnPropertyNames(&object, globalObject, propertyNames, JSC::DontEnumPropertiesMode::Exclude);

for (auto& name : propertyNames) {

auto inspectorValue = jsToInspectorValue(globalObject, object.get(globalObject, name), maxDepth);

if (!inspectorValue)

return nullptr;

inspectorObject->setValue(name.string(), inspectorValue.releaseNonNull());

}

return inspectorObject;

}

ASSERT_NOT_REACHED();

return nullptr;

}

RefPtr<JSON::Value> toInspectorValue(JSC::JSGlobalObject* globalObject, JSC::JSValue value)

{

// FIXME: Maybe we should move the JSLockHolder stuff to the callers since this function takes a JSValue directly.

// Doing the locking here made sense when we were trying to abstract the difference between multiple JavaScript engines.

JSC::JSLockHolder holder(globalObject);

return jsToInspectorValue(globalObject, value, JSON::Value::maxDepth);

}

InjectedScriptBase::InjectedScriptBase(const InjectedScriptBase&) = default;

InjectedScriptBase& InjectedScriptBase::operator=(const InjectedScriptBase&) = default;

InjectedScriptBase::InjectedScriptBase(const String& name)

: m_name(name)

{

}

InjectedScriptBase::InjectedScriptBase(const String& name, JSC::JSGlobalObject* globalObject, JSC::JSObject* injectedScriptObject, InspectorEnvironment* environment)

: m_name(name)

, m_globalObject(globalObject)

, m_injectedScriptObject(globalObject->vm(), injectedScriptObject)

, m_environment(environment)

{

}

InjectedScriptBase::~InjectedScriptBase() = default;

bool InjectedScriptBase::hasAccessToInspectedScriptState() const

{

if (CheckedPtr environment = m_environment)

return environment->canAccessInspectedScriptState(m_globalObject);

return false;

}

JSC::JSObject* InjectedScriptBase::injectedScriptObject() const

{

return m_injectedScriptObject.get();

}

Expected<JSC::JSValue, NakedPtr<JSC::Exception>> InjectedScriptBase::callFunctionWithEvalEnabled(ScriptFunctionCall& function) const

{

JSC::DebuggerEvalEnabler evalEnabler(m_globalObject);

return function.call();

}

Ref<JSON::Value> InjectedScriptBase::makeCall(ScriptFunctionCall& function)

{

if (hasNoValue() || !hasAccessToInspectedScriptState())

return JSON::Value::null();

auto globalObject = m_globalObject;

auto result = callFunctionWithEvalEnabled(function);

if (!result) {

auto& error = result.error();

ASSERT(error);

return JSON::Value::create(error->value().toWTFString(globalObject));

}

auto value = result.value();

if (!value)

return JSON::Value::null();

auto resultJSONValue = toInspectorValue(globalObject, value);

if (!resultJSONValue)

return JSON::Value::create(makeString("Object has too long reference chain (must not be longer than "_s, JSON::Value::maxDepth, ')'));

return resultJSONValue.releaseNonNull();

}

void InjectedScriptBase::makeEvalCall(Protocol::ErrorString& errorString, ScriptFunctionCall& function, RefPtr<Protocol::Runtime::RemoteObject>& resultObject, std::optional<bool>& wasThrown, std::optional<int>& savedResultIndex)

{

checkCallResult(errorString, makeCall(function), resultObject, wasThrown, savedResultIndex);

}

void InjectedScriptBase::makeAsyncCall(ScriptFunctionCall& function, AsyncCallCallback&& callback)

{

if (hasNoValue() || !hasAccessToInspectedScriptState()) {

checkAsyncCallResult(JSON::Value::null(), callback);

return;

}

auto* globalObject = m_globalObject;

JSC::VM& vm = globalObject->vm();

JSC::JSNativeStdFunction* jsFunction = nullptr;

{

JSC::JSLockHolder locker(vm);

jsFunction = JSC::JSNativeStdFunction::create(vm, globalObject, 1, String(), [&, callback = WTF::move(callback)] (JSC::JSGlobalObject* globalObject, JSC::CallFrame* callFrame) {

if (!callFrame)

checkAsyncCallResult(JSON::Value::create(makeString("Exception while making a call."_s)), callback);

else if (auto resultJSONValue = toInspectorValue(globalObject, callFrame->argument(0)))

checkAsyncCallResult(resultJSONValue, callback);

else

checkAsyncCallResult(JSON::Value::create(makeString("Object has too long reference chain (must not be longer than "_s, JSON::Value::maxDepth, ')')), callback);

return JSC::JSValue::encode(JSC::jsUndefined());

});

}

function.appendArgument(JSC::JSValue(jsFunction));

auto result = callFunctionWithEvalEnabled(function);

ASSERT_UNUSED(result, result && result.value() && result.value().isUndefined());

if (!result || !result.value()) {

// Since `callback` is moved above, we can't call it if there's an exception while trying to

// execute the `JSNativeStdFunction` inside InjectedScriptSource.js.

jsFunction->function()(globalObject, nullptr);

}

void InjectedScriptBase::checkCallResult(Protocol::ErrorString& errorString, RefPtr<JSON::Value> result, RefPtr<Protocol::Runtime::RemoteObject>& resultObject, std::optional<bool>& wasThrown, std::optional<int>& savedResultIndex)

{

if (!result) {

errorString = "Internal error: result value is empty"_s;

return;

}

if (result->type() == JSON::Value::Type::String) {

errorString = result->asString();

return;

}

auto resultTuple = result->asObject();

if (!resultTuple) {

errorString = "Internal error: result is not an Object"_s;

return;

}

auto typelessResultObject = resultTuple->getObject("result"_s);

if (!typelessResultObject) {

// FIXME: Why do we bother checking for null here, but not checking that the type is Protocol::Runtime::RemoteObject? Surely the two possible errors go hand in hand.

errorString = "Internal error: result is not a pair of value and wasThrown flag"_s;

return;

}

wasThrown = resultTuple->getBoolean("wasThrown"_s);

if (!wasThrown) {

errorString = "Internal error: result is not a pair of value and wasThrown flag"_s;

return;

}

resultObject = Protocol::BindingTraits<Protocol::Runtime::RemoteObject>::runtimeCast(typelessResultObject.releaseNonNull());

savedResultIndex = resultTuple->getInteger("savedResultIndex"_s);

}

void InjectedScriptBase::checkAsyncCallResult(RefPtr<JSON::Value> result, const AsyncCallCallback& callback)

{

Protocol::ErrorString errorString;

RefPtr<Protocol::Runtime::RemoteObject> resultObject;

std::optional<bool> wasThrown;

std::optional<int> savedResultIndex;

checkCallResult(errorString, result, resultObject, wasThrown, savedResultIndex);

callback(errorString, WTF::move(resultObject), WTF::move(wasThrown), WTF::move(savedResultIndex));

}

} // namespace Inspector

WebKit/Source/JavaScriptCore/inspector/InjectedScriptBase.cpp at main · WebKit/WebKit · GitHub

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