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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
*
* Copyright 2015 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef wasm_serialize_h
#define wasm_serialize_h
#include <type_traits>
#include "js/Vector.h"
namespace js {
namespace wasm {
// Factor out common serialization, cloning and about:memory size-computation
// functions for reuse when serializing wasm and asm.js modules.
static inline uint8_t* WriteBytes(uint8_t* dst, const void* src,
size_t nbytes) {
if (nbytes) {
memcpy(dst, src, nbytes);
}
return dst + nbytes;
}
static inline const uint8_t* ReadBytes(const uint8_t* src, void* dst,
size_t nbytes) {
if (nbytes) {
memcpy(dst, src, nbytes);
}
return src + nbytes;
}
static inline const uint8_t* ReadBytesChecked(const uint8_t* src,
size_t* remain, void* dst,
size_t nbytes) {
if (*remain < nbytes) {
return nullptr;
}
memcpy(dst, src, nbytes);
*remain -= nbytes;
return src + nbytes;
}
template <class T>
static inline uint8_t* WriteScalar(uint8_t* dst, T t) {
memcpy(dst, &t, sizeof(t));
return dst + sizeof(t);
}
template <class T>
static inline const uint8_t* ReadScalar(const uint8_t* src, T* dst) {
memcpy(dst, src, sizeof(*dst));
return src + sizeof(*dst);
}
template <class T>
static inline const uint8_t* ReadScalarChecked(const uint8_t* src,
size_t* remain, T* dst) {
if (*remain < sizeof(*dst)) {
return nullptr;
}
memcpy(dst, src, sizeof(*dst));
*remain -= sizeof(*dst);
return src + sizeof(*dst);
}
template <class T, size_t N>
static inline size_t SerializedVectorSize(
const mozilla::Vector<T, N, SystemAllocPolicy>& vec) {
size_t size = sizeof(uint32_t);
for (size_t i = 0; i < vec.length(); i++) {
size += vec[i].serializedSize();
}
return size;
}
template <class T, size_t N>
static inline uint8_t* SerializeVector(
uint8_t* cursor, const mozilla::Vector<T, N, SystemAllocPolicy>& vec) {
cursor = WriteScalar<uint32_t>(cursor, vec.length());
for (size_t i = 0; i < vec.length(); i++) {
cursor = vec[i].serialize(cursor);
}
return cursor;
}
template <class T, size_t N>
static inline const uint8_t* DeserializeVector(
const uint8_t* cursor, mozilla::Vector<T, N, SystemAllocPolicy>* vec) {
uint32_t length;
cursor = ReadScalar<uint32_t>(cursor, &length);
if (!vec->resize(length)) {
return nullptr;
}
for (size_t i = 0; i < vec->length(); i++) {
if (!(cursor = (*vec)[i].deserialize(cursor))) {
return nullptr;
}
}
return cursor;
}
template <class T, size_t N>
static inline size_t SizeOfVectorExcludingThis(
const mozilla::Vector<T, N, SystemAllocPolicy>& vec,
MallocSizeOf mallocSizeOf) {
size_t size = vec.sizeOfExcludingThis(mallocSizeOf);
for (const T& t : vec) {
size += t.sizeOfExcludingThis(mallocSizeOf);
}
return size;
}
template <class T, size_t N>
static inline size_t SerializedPodVectorSize(
const mozilla::Vector<T, N, SystemAllocPolicy>& vec) {
return sizeof(uint32_t) + vec.length() * sizeof(T);
}
template <class T, size_t N>
static inline uint8_t* SerializePodVector(
uint8_t* cursor, const mozilla::Vector<T, N, SystemAllocPolicy>& vec) {
// This binary format must not change without taking into consideration the
// constraints in Assumptions::serialize.
cursor = WriteScalar<uint32_t>(cursor, vec.length());
cursor = WriteBytes(cursor, vec.begin(), vec.length() * sizeof(T));
return cursor;
}
template <class T, size_t N>
static inline const uint8_t* DeserializePodVector(
const uint8_t* cursor, mozilla::Vector<T, N, SystemAllocPolicy>* vec) {
uint32_t length;
cursor = ReadScalar<uint32_t>(cursor, &length);
if (!vec->initLengthUninitialized(length)) {
return nullptr;
}
cursor = ReadBytes(cursor, vec->begin(), length * sizeof(T));
return cursor;
}
template <class T, size_t N>
static inline const uint8_t* DeserializePodVectorChecked(
const uint8_t* cursor, size_t* remain,
mozilla::Vector<T, N, SystemAllocPolicy>* vec) {
uint32_t length;
cursor = ReadScalarChecked<uint32_t>(cursor, remain, &length);
if (!cursor || !vec->initLengthUninitialized(length)) {
return nullptr;
}
cursor = ReadBytesChecked(cursor, remain, vec->begin(), length * sizeof(T));
return cursor;
}
template <class T>
inline size_t SerializableRefPtr<T>::serializedSize() const {
return (*this)->serializedSize();
}
template <class T>
inline uint8_t* SerializableRefPtr<T>::serialize(uint8_t* cursor) const {
return (*this)->serialize(cursor);
}
template <class T>
inline const uint8_t* SerializableRefPtr<T>::deserialize(
const uint8_t* cursor) {
auto* t = js_new<std::remove_const_t<T>>();
*this = t;
return t->deserialize(cursor);
}
template <class T>
inline size_t SerializableRefPtr<T>::sizeOfExcludingThis(
mozilla::MallocSizeOf mallocSizeOf) const {
return (*this)->sizeOfExcludingThis(mallocSizeOf);
}
} // namespace wasm
} // namespace js
#endif // wasm_serialize_h
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