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110 lines
4.1 KiB
110 lines
4.1 KiB
// Copyright 2016 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "src/inspector/v8-value-copier.h"
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namespace v8_inspector {
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namespace {
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static int kMaxDepth = 20;
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static int kMaxCalls = 1000;
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class V8ValueCopier {
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public:
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v8::MaybeLocal<v8::Value> copy(v8::Local<v8::Value> value, int depth) {
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if (++m_calls > kMaxCalls || depth > kMaxDepth)
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return v8::MaybeLocal<v8::Value>();
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if (value.IsEmpty()) return v8::MaybeLocal<v8::Value>();
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if (value->IsNull() || value->IsUndefined() || value->IsBoolean() ||
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value->IsString() || value->IsNumber())
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return value;
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if (!value->IsObject()) return v8::MaybeLocal<v8::Value>();
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v8::Local<v8::Object> object = value.As<v8::Object>();
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if (object->CreationContext() != m_from) return value;
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if (object->IsArray()) {
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v8::Local<v8::Array> array = object.As<v8::Array>();
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v8::Local<v8::Array> result = v8::Array::New(m_isolate, array->Length());
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if (!result->SetPrototype(m_to, v8::Null(m_isolate)).FromMaybe(false))
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return v8::MaybeLocal<v8::Value>();
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for (uint32_t i = 0; i < array->Length(); ++i) {
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v8::Local<v8::Value> item;
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if (!array->Get(m_from, i).ToLocal(&item))
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return v8::MaybeLocal<v8::Value>();
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v8::Local<v8::Value> copied;
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if (!copy(item, depth + 1).ToLocal(&copied))
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return v8::MaybeLocal<v8::Value>();
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if (!createDataProperty(m_to, result, i, copied).FromMaybe(false))
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return v8::MaybeLocal<v8::Value>();
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}
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return result;
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}
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v8::Local<v8::Object> result = v8::Object::New(m_isolate);
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if (!result->SetPrototype(m_to, v8::Null(m_isolate)).FromMaybe(false))
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return v8::MaybeLocal<v8::Value>();
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v8::Local<v8::Array> properties;
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if (!object->GetOwnPropertyNames(m_from).ToLocal(&properties))
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return v8::MaybeLocal<v8::Value>();
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for (uint32_t i = 0; i < properties->Length(); ++i) {
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v8::Local<v8::Value> name;
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if (!properties->Get(m_from, i).ToLocal(&name) || !name->IsString())
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return v8::MaybeLocal<v8::Value>();
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v8::Local<v8::Value> property;
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if (!object->Get(m_from, name).ToLocal(&property))
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return v8::MaybeLocal<v8::Value>();
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v8::Local<v8::Value> copied;
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if (!copy(property, depth + 1).ToLocal(&copied))
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return v8::MaybeLocal<v8::Value>();
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if (!createDataProperty(m_to, result, v8::Local<v8::String>::Cast(name),
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copied)
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.FromMaybe(false))
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return v8::MaybeLocal<v8::Value>();
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}
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return result;
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}
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v8::Isolate* m_isolate;
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v8::Local<v8::Context> m_from;
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v8::Local<v8::Context> m_to;
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int m_calls;
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};
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} // namespace
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v8::MaybeLocal<v8::Value> copyValueFromDebuggerContext(
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v8::Isolate* isolate, v8::Local<v8::Context> debuggerContext,
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v8::Local<v8::Context> toContext, v8::Local<v8::Value> value) {
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V8ValueCopier copier;
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copier.m_isolate = isolate;
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copier.m_from = debuggerContext;
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copier.m_to = toContext;
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copier.m_calls = 0;
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return copier.copy(value, 0);
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}
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v8::Maybe<bool> createDataProperty(v8::Local<v8::Context> context,
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v8::Local<v8::Object> object,
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v8::Local<v8::Name> key,
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v8::Local<v8::Value> value) {
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v8::TryCatch tryCatch(context->GetIsolate());
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v8::Isolate::DisallowJavascriptExecutionScope throwJs(
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context->GetIsolate(),
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v8::Isolate::DisallowJavascriptExecutionScope::THROW_ON_FAILURE);
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return object->CreateDataProperty(context, key, value);
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}
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v8::Maybe<bool> createDataProperty(v8::Local<v8::Context> context,
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v8::Local<v8::Array> array, int index,
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v8::Local<v8::Value> value) {
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v8::TryCatch tryCatch(context->GetIsolate());
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v8::Isolate::DisallowJavascriptExecutionScope throwJs(
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context->GetIsolate(),
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v8::Isolate::DisallowJavascriptExecutionScope::THROW_ON_FAILURE);
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return array->CreateDataProperty(context, index, value);
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}
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} // namespace v8_inspector
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