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// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/inspector/v8-value-copier.h"
namespace v8_inspector {
namespace {
static int kMaxDepth = 20;
static int kMaxCalls = 1000;
class V8ValueCopier {
public:
v8::MaybeLocal<v8::Value> copy(v8::Local<v8::Value> value, int depth) {
if (++m_calls > kMaxCalls || depth > kMaxDepth)
return v8::MaybeLocal<v8::Value>();
if (value.IsEmpty()) return v8::MaybeLocal<v8::Value>();
if (value->IsNull() || value->IsUndefined() || value->IsBoolean() ||
value->IsString() || value->IsNumber())
return value;
if (!value->IsObject()) return v8::MaybeLocal<v8::Value>();
v8::Local<v8::Object> object = value.As<v8::Object>();
if (object->CreationContext() != m_from) return value;
if (object->IsArray()) {
v8::Local<v8::Array> array = object.As<v8::Array>();
v8::Local<v8::Array> result = v8::Array::New(m_isolate, array->Length());
if (!result->SetPrototype(m_to, v8::Null(m_isolate)).FromMaybe(false))
return v8::MaybeLocal<v8::Value>();
for (uint32_t i = 0; i < array->Length(); ++i) {
v8::Local<v8::Value> item;
if (!array->Get(m_from, i).ToLocal(&item))
return v8::MaybeLocal<v8::Value>();
v8::Local<v8::Value> copied;
if (!copy(item, depth + 1).ToLocal(&copied))
return v8::MaybeLocal<v8::Value>();
if (!createDataProperty(m_to, result, i, copied).FromMaybe(false))
return v8::MaybeLocal<v8::Value>();
}
return result;
}
v8::Local<v8::Object> result = v8::Object::New(m_isolate);
if (!result->SetPrototype(m_to, v8::Null(m_isolate)).FromMaybe(false))
return v8::MaybeLocal<v8::Value>();
v8::Local<v8::Array> properties;
if (!object->GetOwnPropertyNames(m_from).ToLocal(&properties))
return v8::MaybeLocal<v8::Value>();
for (uint32_t i = 0; i < properties->Length(); ++i) {
v8::Local<v8::Value> name;
if (!properties->Get(m_from, i).ToLocal(&name) || !name->IsString())
return v8::MaybeLocal<v8::Value>();
v8::Local<v8::Value> property;
if (!object->Get(m_from, name).ToLocal(&property))
return v8::MaybeLocal<v8::Value>();
v8::Local<v8::Value> copied;
if (!copy(property, depth + 1).ToLocal(&copied))
return v8::MaybeLocal<v8::Value>();
if (!createDataProperty(m_to, result, v8::Local<v8::String>::Cast(name),
copied)
.FromMaybe(false))
return v8::MaybeLocal<v8::Value>();
}
return result;
}
v8::Isolate* m_isolate;
v8::Local<v8::Context> m_from;
v8::Local<v8::Context> m_to;
int m_calls;
};
protocol::Response toProtocolValue(v8::Local<v8::Context> context,
v8::Local<v8::Value> value, int maxDepth,
std::unique_ptr<protocol::Value>* result) {
using protocol::Response;
if (value.IsEmpty()) {
UNREACHABLE();
return Response::InternalError();
}
if (!maxDepth) return Response::Error("Object reference chain is too long");
maxDepth--;
if (value->IsNull() || value->IsUndefined()) {
*result = protocol::Value::null();
return Response::OK();
}
if (value->IsBoolean()) {
*result =
protocol::FundamentalValue::create(value.As<v8::Boolean>()->Value());
return Response::OK();
}
if (value->IsNumber()) {
double doubleValue = value.As<v8::Number>()->Value();
int intValue = static_cast<int>(doubleValue);
if (intValue == doubleValue) {
*result = protocol::FundamentalValue::create(intValue);
return Response::OK();
}
*result = protocol::FundamentalValue::create(doubleValue);
return Response::OK();
}
if (value->IsString()) {
*result =
protocol::StringValue::create(toProtocolString(value.As<v8::String>()));
return Response::OK();
}
if (value->IsArray()) {
v8::Local<v8::Array> array = value.As<v8::Array>();
std::unique_ptr<protocol::ListValue> inspectorArray =
protocol::ListValue::create();
uint32_t length = array->Length();
for (uint32_t i = 0; i < length; i++) {
v8::Local<v8::Value> value;
if (!array->Get(context, i).ToLocal(&value))
return Response::InternalError();
std::unique_ptr<protocol::Value> element;
Response response = toProtocolValue(context, value, maxDepth, &element);
if (!response.isSuccess()) return response;
inspectorArray->pushValue(std::move(element));
}
*result = std::move(inspectorArray);
return Response::OK();
}
if (value->IsObject()) {
std::unique_ptr<protocol::DictionaryValue> jsonObject =
protocol::DictionaryValue::create();
v8::Local<v8::Object> object = v8::Local<v8::Object>::Cast(value);
v8::Local<v8::Array> propertyNames;
if (!object->GetPropertyNames(context).ToLocal(&propertyNames))
return Response::InternalError();
uint32_t length = propertyNames->Length();
for (uint32_t i = 0; i < length; i++) {
v8::Local<v8::Value> name;
if (!propertyNames->Get(context, i).ToLocal(&name))
return Response::InternalError();
// FIXME(yurys): v8::Object should support GetOwnPropertyNames
if (name->IsString()) {
v8::Maybe<bool> hasRealNamedProperty = object->HasRealNamedProperty(
context, v8::Local<v8::String>::Cast(name));
if (!hasRealNamedProperty.IsJust() || !hasRealNamedProperty.FromJust())
continue;
}
v8::Local<v8::String> propertyName;
if (!name->ToString(context).ToLocal(&propertyName)) continue;
v8::Local<v8::Value> property;
if (!object->Get(context, name).ToLocal(&property))
return Response::InternalError();
std::unique_ptr<protocol::Value> propertyValue;
Response response =
toProtocolValue(context, property, maxDepth, &propertyValue);
if (!response.isSuccess()) return response;
jsonObject->setValue(toProtocolString(propertyName),
std::move(propertyValue));
}
*result = std::move(jsonObject);
return Response::OK();
}
return Response::Error("Object couldn't be returned by value");
}
} // namespace
v8::MaybeLocal<v8::Value> copyValueFromDebuggerContext(
v8::Isolate* isolate, v8::Local<v8::Context> debuggerContext,
v8::Local<v8::Context> toContext, v8::Local<v8::Value> value) {
V8ValueCopier copier;
copier.m_isolate = isolate;
copier.m_from = debuggerContext;
copier.m_to = toContext;
copier.m_calls = 0;
return copier.copy(value, 0);
}
v8::Maybe<bool> createDataProperty(v8::Local<v8::Context> context,
v8::Local<v8::Object> object,
v8::Local<v8::Name> key,
v8::Local<v8::Value> value) {
v8::TryCatch tryCatch(context->GetIsolate());
v8::Isolate::DisallowJavascriptExecutionScope throwJs(
context->GetIsolate(),
v8::Isolate::DisallowJavascriptExecutionScope::THROW_ON_FAILURE);
return object->CreateDataProperty(context, key, value);
}
v8::Maybe<bool> createDataProperty(v8::Local<v8::Context> context,
v8::Local<v8::Array> array, int index,
v8::Local<v8::Value> value) {
v8::TryCatch tryCatch(context->GetIsolate());
v8::Isolate::DisallowJavascriptExecutionScope throwJs(
context->GetIsolate(),
v8::Isolate::DisallowJavascriptExecutionScope::THROW_ON_FAILURE);
return array->CreateDataProperty(context, index, value);
}
protocol::Response toProtocolValue(v8::Local<v8::Context> context,
v8::Local<v8::Value> value,
std::unique_ptr<protocol::Value>* result) {
return toProtocolValue(context, value, 1000, result);
}
} // namespace v8_inspector
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