[wasm] Refactor wasm-serialization to fix alignment
- Alignment of code sections is only relative to start of header. Code should be aligned in the buffer. - Rewrites Reader/Writer classes to make global alignment easier. - Rewrites the native serialization to simplify things in preparation for switch to streaming serialization APIs. Bug: chromium:719007 Change-Id: I0397bc84a8d009b4fd7f5286bb5abc527bb0db95 Reviewed-on: https://chromium-review.googlesource.com/1027433 Commit-Queue: Bill Budge <bbudge@chromium.org> Reviewed-by: Clemens Hammacher <clemensh@chromium.org> Cr-Commit-Position: refs/heads/master@{#52860}
This commit is contained in:
Bill Budge
Commit Bot
parent
441e6d4a3c
commit
28e015dbaf
@ -28,102 +28,92 @@ namespace wasm {
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namespace {
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// TODO(bbudge) Try to unify the various implementations of readers and writers
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// in WASM, e.g. StreamProcessor and ZoneBuffer, with these.
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class Writer {
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public:
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explicit Writer(Vector<byte> buffer)
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: buffer_(buffer), start_(buffer_.start()) {}
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: start_(buffer.start()), end_(buffer.end()), pos_(buffer.start()) {}
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size_t bytes_written() const { return pos_ - start_; }
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byte* current_location() const { return pos_; }
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size_t current_size() const { return end_ - pos_; }
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Vector<byte> current_buffer() const {
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return {current_location(), current_size()};
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}
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template <typename T>
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void Write(const T& value) {
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DCHECK_GE(current_size(), sizeof(T));
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WriteUnalignedValue(reinterpret_cast<Address>(current_location()), value);
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pos_ += sizeof(T);
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if (FLAG_wasm_trace_serialization) {
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OFStream os(stdout);
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os << "wrote: " << (size_t)value << " sized: " << sizeof(T) << std::endl;
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}
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DCHECK_GE(buffer_.size(), sizeof(T));
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WriteUnalignedValue(reinterpret_cast<Address>(buffer_.start()), value);
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buffer_ = buffer_ + sizeof(T);
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}
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void WriteVector(const Vector<const byte> data) {
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DCHECK_GE(buffer_.size(), data.size());
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if (data.size() > 0) {
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memcpy(buffer_.start(), data.start(), data.size());
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buffer_ = buffer_ + data.size();
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void WriteVector(const Vector<const byte> v) {
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DCHECK_GE(current_size(), v.size());
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if (v.size() > 0) {
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memcpy(current_location(), v.start(), v.size());
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pos_ += v.size();
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}
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if (FLAG_wasm_trace_serialization) {
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OFStream os(stdout);
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os << "wrote vector of " << data.size() << " elements" << std::endl;
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}
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}
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Vector<byte> current_buffer() const { return buffer_; }
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void Align(size_t alignment) {
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size_t num_written_bytes = static_cast<size_t>(buffer_.start() - start_);
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if (num_written_bytes % alignment) {
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size_t padding = alignment - num_written_bytes % alignment;
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buffer_ = buffer_ + padding;
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if (FLAG_wasm_trace_serialization) {
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OFStream os(stdout);
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os << "wrote padding, sized: " << padding << std::endl;
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}
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os << "wrote vector of " << v.size() << " elements" << std::endl;
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}
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}
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private:
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Vector<byte> buffer_;
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byte* const start_;
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byte* const end_;
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byte* pos_;
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};
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class Reader {
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public:
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explicit Reader(Vector<const byte> buffer)
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: buffer_(buffer), start_(buffer_.start()) {}
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: start_(buffer.start()), end_(buffer.end()), pos_(buffer.start()) {}
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size_t bytes_read() const { return pos_ - start_; }
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const byte* current_location() const { return pos_; }
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size_t current_size() const { return end_ - pos_; }
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Vector<const byte> current_buffer() const {
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return {current_location(), current_size()};
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}
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template <typename T>
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T Read() {
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DCHECK_GE(buffer_.size(), sizeof(T));
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T ret = ReadUnalignedValue<T>(reinterpret_cast<Address>(buffer_.start()));
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buffer_ = buffer_ + sizeof(T);
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DCHECK_GE(current_size(), sizeof(T));
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T value =
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ReadUnalignedValue<T>(reinterpret_cast<Address>(current_location()));
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pos_ += sizeof(T);
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if (FLAG_wasm_trace_serialization) {
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OFStream os(stdout);
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os << "read: " << (size_t)ret << " sized: " << sizeof(T) << std::endl;
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os << "read: " << (size_t)value << " sized: " << sizeof(T) << std::endl;
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}
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return ret;
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return value;
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}
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Vector<const byte> GetSubvector(size_t size) {
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Vector<const byte> ret = {buffer_.start(), size};
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buffer_ = buffer_ + size;
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return ret;
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}
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void ReadIntoVector(const Vector<byte> data) {
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if (data.size() > 0) {
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DCHECK_GE(buffer_.size(), data.size());
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memcpy(data.start(), buffer_.start(), data.size());
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buffer_ = buffer_ + data.size();
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void ReadVector(Vector<byte> v) {
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if (v.size() > 0) {
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DCHECK_GE(current_size(), v.size());
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memcpy(v.start(), current_location(), v.size());
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pos_ += v.size();
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}
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if (FLAG_wasm_trace_serialization) {
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OFStream os(stdout);
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os << "read vector of " << data.size() << " elements" << std::endl;
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os << "read vector of " << v.size() << " elements" << std::endl;
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}
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}
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Vector<const byte> current_buffer() const { return buffer_; }
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void Align(size_t alignment) {
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size_t num_read_bytes = static_cast<size_t>(buffer_.start() - start_);
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if (num_read_bytes % alignment) {
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size_t padding = alignment - num_read_bytes % alignment;
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buffer_ = buffer_ + padding;
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if (FLAG_wasm_trace_serialization) {
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OFStream os(stdout);
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os << "read padding, sized: " << padding << std::endl;
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}
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}
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}
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void Skip(size_t size) { pos_ += size; }
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private:
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Vector<const byte> buffer_;
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const byte* const start_;
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const byte* const end_;
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const byte* pos_;
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};
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constexpr size_t kVersionSize = 4 * sizeof(uint32_t);
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@ -131,29 +121,26 @@ constexpr size_t kVersionSize = 4 * sizeof(uint32_t);
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// Start from 1 so an encoded stub id is not confused with an encoded builtin.
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constexpr int kFirstStubId = 1;
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void WriteVersion(Isolate* isolate, Vector<byte> buffer) {
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DCHECK_GE(buffer.size(), kVersionSize);
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Writer writer(buffer);
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writer.Write(SerializedData::ComputeMagicNumber(
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void WriteVersion(Isolate* isolate, Writer* writer) {
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writer->Write(SerializedData::ComputeMagicNumber(
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isolate->heap()->external_reference_table()));
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writer.Write(Version::Hash());
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writer.Write(static_cast<uint32_t>(CpuFeatures::SupportedFeatures()));
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writer.Write(FlagList::Hash());
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writer->Write(Version::Hash());
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writer->Write(static_cast<uint32_t>(CpuFeatures::SupportedFeatures()));
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writer->Write(FlagList::Hash());
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}
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bool IsSupportedVersion(Isolate* isolate, const Vector<const byte> buffer) {
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if (buffer.size() < kVersionSize) return false;
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byte version[kVersionSize];
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WriteVersion(isolate, {version, kVersionSize});
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if (memcmp(buffer.start(), version, kVersionSize) == 0) return true;
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return false;
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bool IsSupportedVersion(Isolate* isolate, const Vector<const byte> version) {
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if (version.size() < kVersionSize) return false;
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byte current_version[kVersionSize];
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Writer writer({current_version, kVersionSize});
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WriteVersion(isolate, &writer);
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return memcmp(version.start(), current_version, kVersionSize) == 0;
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}
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// On Intel, call sites are encoded as a displacement. For linking
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// and for serialization/deserialization, we want to store/retrieve
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// a tag (the function index). On Intel, that means accessing the
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// raw displacement. Everywhere else, that simply means accessing
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// the target address.
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// On Intel, call sites are encoded as a displacement. For linking and for
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// serialization/deserialization, we want to store/retrieve a tag (the function
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// index). On Intel, that means accessing the raw displacement. Everywhere else,
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// that simply means accessing the target address.
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void SetWasmCalleeTag(RelocInfo* rinfo, uint32_t tag) {
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#if V8_TARGET_ARCH_X64 || V8_TARGET_ARCH_IA32
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*(reinterpret_cast<uint32_t*>(rinfo->target_address_address())) = tag;
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@ -178,110 +165,12 @@ uint32_t GetWasmCalleeTag(RelocInfo* rinfo) {
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#endif
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}
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} // namespace
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constexpr size_t kHeaderSize =
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sizeof(uint32_t) + // total wasm function count
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sizeof(uint32_t); // imported functions - i.e. index of first wasm function
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enum SerializationSection { Init, Metadata, Stubs, CodeSection, Done };
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class V8_EXPORT_PRIVATE NativeModuleSerializer {
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public:
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explicit NativeModuleSerializer(Isolate*, const NativeModule*);
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size_t Measure() const;
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size_t Write(Vector<byte>);
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bool IsDone() const { return state_ == Done; }
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private:
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size_t MeasureHeader() const;
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static size_t GetCodeHeaderSize();
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size_t MeasureCode(const WasmCode*) const;
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size_t MeasureCopiedStubs() const;
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void BufferHeader();
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// we buffer all the stubs because they are small
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void BufferCopiedStubs();
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void BufferCodeInAllocatedScratch(const WasmCode*);
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void BufferCurrentWasmCode();
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size_t DrainBuffer(Vector<byte> dest);
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uint32_t EncodeBuiltinOrStub(Address);
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Isolate* const isolate_ = nullptr;
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const NativeModule* const native_module_ = nullptr;
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SerializationSection state_ = Init;
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uint32_t index_ = 0;
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std::vector<byte> scratch_;
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Vector<byte> remaining_;
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// wasm and copied stubs reverse lookup
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std::map<Address, uint32_t> wasm_targets_lookup_;
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// immovable builtins and runtime entries lookup
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std::map<Address, uint32_t> reference_table_lookup_;
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std::map<Address, uint32_t> stub_lookup_;
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std::map<Address, uint32_t> builtin_lookup_;
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};
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class V8_EXPORT_PRIVATE NativeModuleDeserializer {
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public:
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explicit NativeModuleDeserializer(Isolate*, NativeModule*);
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// Currently, we don't support streamed reading, yet albeit the
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// API suggests that.
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bool Read(Vector<const byte>);
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private:
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void ExpectHeader();
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void Expect(size_t size);
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bool ReadHeader();
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bool ReadCode();
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bool ReadStubs();
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Address GetTrampolineOrStubFromTag(uint32_t);
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Isolate* const isolate_ = nullptr;
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NativeModule* const native_module_ = nullptr;
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std::vector<byte> scratch_;
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std::vector<Address> stubs_;
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Vector<const byte> unread_;
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size_t current_expectation_ = 0;
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uint32_t index_ = 0;
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};
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NativeModuleSerializer::NativeModuleSerializer(Isolate* isolate,
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const NativeModule* module)
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: isolate_(isolate), native_module_(module) {
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DCHECK_NOT_NULL(isolate_);
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DCHECK_NOT_NULL(native_module_);
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// TODO(mtrofin): persist the export wrappers. Ideally, we'd only persist
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// the unique ones, i.e. the cache.
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ExternalReferenceTable* table = isolate_->heap()->external_reference_table();
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for (uint32_t i = 0; i < table->size(); ++i) {
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Address addr = table->address(i);
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reference_table_lookup_.insert(std::make_pair(addr, i));
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}
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// defer populating the stub_lookup_ to when we buffer the stubs
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for (auto pair : native_module_->trampolines_) {
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v8::internal::Code* code = Code::GetCodeFromTargetAddress(pair.first);
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int builtin_index = code->builtin_index();
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if (builtin_index >= 0) {
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uint32_t tag = static_cast<uint32_t>(builtin_index);
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builtin_lookup_.insert(std::make_pair(pair.second, tag));
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}
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}
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BufferHeader();
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state_ = Metadata;
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}
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size_t NativeModuleSerializer::MeasureHeader() const {
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return sizeof(uint32_t) + // total wasm fct count
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sizeof(uint32_t); // imported fcts - i.e. index of first wasm function
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}
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void NativeModuleSerializer::BufferHeader() {
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size_t metadata_size = MeasureHeader();
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scratch_.resize(metadata_size);
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remaining_ = {scratch_.data(), metadata_size};
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Writer writer(remaining_);
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writer.Write(native_module_->FunctionCount());
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writer.Write(native_module_->num_imported_functions());
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}
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size_t NativeModuleSerializer::GetCodeHeaderSize() {
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size_t size = sizeof(size_t) + // size of this section
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constexpr size_t kCodeHeaderSize =
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sizeof(size_t) + // size of code section
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sizeof(size_t) + // offset of constant pool
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sizeof(size_t) + // offset of safepoint table
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sizeof(size_t) + // offset of handler table
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@ -291,56 +180,104 @@ size_t NativeModuleSerializer::GetCodeHeaderSize() {
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sizeof(size_t) + // source positions size
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sizeof(size_t) + // protected instructions size
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sizeof(WasmCode::Tier); // tier
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return RoundUp(size, sizeof(size_t));
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} // namespace
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class V8_EXPORT_PRIVATE NativeModuleSerializer {
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public:
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NativeModuleSerializer() = delete;
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NativeModuleSerializer(Isolate*, const NativeModule*);
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size_t Measure() const;
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bool Write(Writer* writer);
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private:
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size_t MeasureCopiedStubs() const;
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size_t MeasureCode(const WasmCode*) const;
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void WriteHeader(Writer* writer);
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void WriteCopiedStubs(Writer* writer);
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void WriteCode(const WasmCode*, Writer* writer);
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uint32_t EncodeBuiltinOrStub(Address);
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Isolate* const isolate_;
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const NativeModule* const native_module_;
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bool write_called_;
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// wasm and copied stubs reverse lookup
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std::map<Address, uint32_t> wasm_targets_lookup_;
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// immovable builtins and runtime entries lookup
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std::map<Address, uint32_t> reference_table_lookup_;
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std::map<Address, uint32_t> stub_lookup_;
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std::map<Address, uint32_t> builtin_lookup_;
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DISALLOW_COPY_AND_ASSIGN(NativeModuleSerializer);
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};
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NativeModuleSerializer::NativeModuleSerializer(Isolate* isolate,
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const NativeModule* module)
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: isolate_(isolate), native_module_(module), write_called_(false) {
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DCHECK_NOT_NULL(isolate_);
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DCHECK_NOT_NULL(native_module_);
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// TODO(mtrofin): persist the export wrappers. Ideally, we'd only persist
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// the unique ones, i.e. the cache.
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ExternalReferenceTable* table = isolate_->heap()->external_reference_table();
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for (uint32_t i = 0; i < table->size(); ++i) {
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Address addr = table->address(i);
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reference_table_lookup_.insert(std::make_pair(addr, i));
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}
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// Defer populating stub_lookup_ to when we write the stubs.
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for (auto pair : native_module_->trampolines_) {
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v8::internal::Code* code = Code::GetCodeFromTargetAddress(pair.first);
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int builtin_index = code->builtin_index();
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if (builtin_index >= 0) {
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uint32_t tag = static_cast<uint32_t>(builtin_index);
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builtin_lookup_.insert(std::make_pair(pair.second, tag));
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}
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}
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}
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size_t NativeModuleSerializer::MeasureCopiedStubs() const {
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size_t size = sizeof(uint32_t); // number of stubs
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for (auto pair : native_module_->trampolines_) {
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v8::internal::Code* code = Code::GetCodeFromTargetAddress(pair.first);
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int builtin_index = code->builtin_index();
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if (builtin_index < 0) size += sizeof(uint32_t); // stub key
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}
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return size;
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}
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size_t NativeModuleSerializer::MeasureCode(const WasmCode* code) const {
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return GetCodeHeaderSize() + code->instructions().size() + // code
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code->reloc_info().size() + // reloc info
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code->source_positions().size() + // source pos.
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code->protected_instructions().size() * // protected inst.
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return code->instructions().size() + code->reloc_info().size() +
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code->source_positions().size() +
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code->protected_instructions().size() *
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sizeof(trap_handler::ProtectedInstructionData);
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}
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size_t NativeModuleSerializer::Measure() const {
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size_t ret = MeasureHeader() + MeasureCopiedStubs();
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for (uint32_t i = native_module_->num_imported_functions(),
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e = native_module_->FunctionCount();
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i < e; ++i) {
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ret += MeasureCode(native_module_->GetCode(i));
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size_t size = kHeaderSize + MeasureCopiedStubs();
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uint32_t first_wasm_fn = native_module_->num_imported_functions();
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uint32_t total_fns = native_module_->FunctionCount();
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for (uint32_t i = first_wasm_fn; i < total_fns; ++i) {
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size += kCodeHeaderSize;
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size += MeasureCode(native_module_->GetCode(i));
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}
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return ret;
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return size;
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}
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size_t NativeModuleSerializer::DrainBuffer(Vector<byte> dest) {
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size_t to_write = std::min(dest.size(), remaining_.size());
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memcpy(dest.start(), remaining_.start(), to_write);
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DCHECK_GE(remaining_.size(), to_write);
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remaining_ = remaining_ + to_write;
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return to_write;
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void NativeModuleSerializer::WriteHeader(Writer* writer) {
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writer->Write(native_module_->FunctionCount());
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writer->Write(native_module_->num_imported_functions());
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}
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size_t NativeModuleSerializer::MeasureCopiedStubs() const {
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size_t ret = sizeof(uint32_t); // number of stubs
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for (auto pair : native_module_->trampolines_) {
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v8::internal::Code* code = Code::GetCodeFromTargetAddress(pair.first);
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int builtin_index = code->builtin_index();
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if (builtin_index < 0) ret += sizeof(uint32_t);
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}
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return ret;
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||||
}
|
||||
|
||||
void NativeModuleSerializer::BufferCopiedStubs() {
|
||||
// We buffer all the stubs together, because they are very likely
|
||||
// few and small. Each stub is buffered like a WasmCode would,
|
||||
// and in addition prefaced by its stub key. The whole section is prefaced
|
||||
// by the number of stubs.
|
||||
size_t buff_size = MeasureCopiedStubs();
|
||||
scratch_.resize(buff_size);
|
||||
remaining_ = {scratch_.data(), buff_size};
|
||||
Writer writer(remaining_);
|
||||
writer.Write(
|
||||
static_cast<uint32_t>((buff_size - sizeof(uint32_t)) / sizeof(uint32_t)));
|
||||
void NativeModuleSerializer::WriteCopiedStubs(Writer* writer) {
|
||||
// Write the number of stubs and their keys.
|
||||
// TODO(all) Serialize the stubs as WasmCode.
|
||||
size_t stubs_size = MeasureCopiedStubs();
|
||||
// Get the stub count from the number of keys.
|
||||
size_t num_stubs = (stubs_size - sizeof(uint32_t)) / sizeof(uint32_t);
|
||||
writer->Write(static_cast<uint32_t>(num_stubs));
|
||||
uint32_t stub_id = kFirstStubId;
|
||||
|
||||
for (auto pair : native_module_->trampolines_) {
|
||||
@ -348,48 +285,35 @@ void NativeModuleSerializer::BufferCopiedStubs() {
|
||||
int builtin_index = code->builtin_index();
|
||||
if (builtin_index < 0) {
|
||||
stub_lookup_.insert(std::make_pair(pair.second, stub_id));
|
||||
writer.Write(code->stub_key());
|
||||
writer->Write(code->stub_key());
|
||||
++stub_id;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void NativeModuleSerializer::BufferCurrentWasmCode() {
|
||||
const WasmCode* code = native_module_->GetCode(index_);
|
||||
size_t size = MeasureCode(code);
|
||||
scratch_.resize(size);
|
||||
remaining_ = {scratch_.data(), size};
|
||||
BufferCodeInAllocatedScratch(code);
|
||||
}
|
||||
|
||||
void NativeModuleSerializer::BufferCodeInAllocatedScratch(
|
||||
const WasmCode* code) {
|
||||
// We write the address, the size, and then copy the code as-is, followed
|
||||
// by reloc info, followed by source positions.
|
||||
Writer writer(remaining_);
|
||||
// write the header
|
||||
writer.Write(MeasureCode(code));
|
||||
writer.Write(code->constant_pool_offset());
|
||||
writer.Write(code->safepoint_table_offset());
|
||||
writer.Write(code->handler_table_offset());
|
||||
writer.Write(code->stack_slots());
|
||||
writer.Write(code->instructions().size());
|
||||
writer.Write(code->reloc_info().size());
|
||||
writer.Write(code->source_positions().size());
|
||||
writer.Write(code->protected_instructions().size());
|
||||
writer.Write(code->tier());
|
||||
writer.Align(kPointerSize);
|
||||
// next is the code, which we have to reloc.
|
||||
byte* serialized_code_start = writer.current_buffer().start();
|
||||
// write the code and everything else
|
||||
writer.WriteVector(code->instructions());
|
||||
writer.WriteVector(code->reloc_info());
|
||||
writer.WriteVector(code->source_positions());
|
||||
writer.WriteVector(
|
||||
void NativeModuleSerializer::WriteCode(const WasmCode* code, Writer* writer) {
|
||||
// Write the size of the entire code section, followed by the code header.
|
||||
writer->Write(MeasureCode(code));
|
||||
writer->Write(code->constant_pool_offset());
|
||||
writer->Write(code->safepoint_table_offset());
|
||||
writer->Write(code->handler_table_offset());
|
||||
writer->Write(code->stack_slots());
|
||||
writer->Write(code->instructions().size());
|
||||
writer->Write(code->reloc_info().size());
|
||||
writer->Write(code->source_positions().size());
|
||||
writer->Write(code->protected_instructions().size());
|
||||
writer->Write(code->tier());
|
||||
// Get a pointer to the code buffer, which we have to relocate.
|
||||
byte* serialized_code_start = writer->current_buffer().start();
|
||||
// Now write the code, reloc info, source positions, and protected code.
|
||||
writer->WriteVector(code->instructions());
|
||||
writer->WriteVector(code->reloc_info());
|
||||
writer->WriteVector(code->source_positions());
|
||||
writer->WriteVector(
|
||||
{reinterpret_cast<const byte*>(code->protected_instructions().data()),
|
||||
sizeof(trap_handler::ProtectedInstructionData) *
|
||||
code->protected_instructions().size()});
|
||||
// now relocate the code
|
||||
// Relocate the code.
|
||||
int mask = RelocInfo::ModeMask(RelocInfo::CODE_TARGET) |
|
||||
RelocInfo::ModeMask(RelocInfo::WASM_CALL) |
|
||||
RelocInfo::ModeMask(RelocInfo::RUNTIME_ENTRY) |
|
||||
@ -451,49 +375,20 @@ uint32_t NativeModuleSerializer::EncodeBuiltinOrStub(Address address) {
|
||||
return tag;
|
||||
}
|
||||
|
||||
size_t NativeModuleSerializer::Write(Vector<byte> dest) {
|
||||
Vector<byte> original = dest;
|
||||
while (dest.size() > 0) {
|
||||
switch (state_) {
|
||||
case Metadata: {
|
||||
dest = dest + DrainBuffer(dest);
|
||||
if (remaining_.size() == 0) {
|
||||
BufferCopiedStubs();
|
||||
state_ = Stubs;
|
||||
bool NativeModuleSerializer::Write(Writer* writer) {
|
||||
DCHECK(!write_called_);
|
||||
write_called_ = true;
|
||||
|
||||
WriteHeader(writer);
|
||||
WriteCopiedStubs(writer);
|
||||
|
||||
uint32_t total_fns = native_module_->FunctionCount();
|
||||
uint32_t first_wasm_fn = native_module_->num_imported_functions();
|
||||
for (uint32_t i = first_wasm_fn; i < total_fns; ++i) {
|
||||
const WasmCode* code = native_module_->GetCode(i);
|
||||
WriteCode(code, writer);
|
||||
}
|
||||
break;
|
||||
}
|
||||
case Stubs: {
|
||||
dest = dest + DrainBuffer(dest);
|
||||
if (remaining_.size() == 0) {
|
||||
index_ = native_module_->num_imported_functions();
|
||||
if (index_ < native_module_->FunctionCount()) {
|
||||
BufferCurrentWasmCode();
|
||||
state_ = CodeSection;
|
||||
} else {
|
||||
state_ = Done;
|
||||
}
|
||||
}
|
||||
break;
|
||||
}
|
||||
case CodeSection: {
|
||||
dest = dest + DrainBuffer(dest);
|
||||
if (remaining_.size() == 0) {
|
||||
++index_; // Move to next code object.
|
||||
if (index_ < native_module_->FunctionCount()) {
|
||||
BufferCurrentWasmCode();
|
||||
} else {
|
||||
state_ = Done;
|
||||
}
|
||||
}
|
||||
break;
|
||||
}
|
||||
default:
|
||||
UNREACHABLE();
|
||||
}
|
||||
}
|
||||
DCHECK_GE(original.size(), dest.size());
|
||||
return original.size() - dest.size();
|
||||
return true;
|
||||
}
|
||||
|
||||
// static
|
||||
@ -501,105 +396,113 @@ std::pair<std::unique_ptr<const byte[]>, size_t> SerializeNativeModule(
|
||||
Isolate* isolate, Handle<WasmCompiledModule> compiled_module) {
|
||||
NativeModule* native_module = compiled_module->GetNativeModule();
|
||||
NativeModuleSerializer serializer(isolate, native_module);
|
||||
size_t version_size = kVersionSize;
|
||||
size_t buff_size = serializer.Measure() + version_size;
|
||||
std::unique_ptr<byte[]> ret(new byte[buff_size]);
|
||||
WriteVersion(isolate, {ret.get(), buff_size});
|
||||
size_t buffer_size = kVersionSize + serializer.Measure();
|
||||
std::unique_ptr<byte[]> buffer(new byte[buffer_size]);
|
||||
|
||||
size_t written =
|
||||
serializer.Write({ret.get() + version_size, buff_size - version_size});
|
||||
if (written != buff_size - version_size) return {};
|
||||
Writer writer({buffer.get(), buffer_size});
|
||||
WriteVersion(isolate, &writer);
|
||||
|
||||
return {std::move(ret), buff_size};
|
||||
if (!serializer.Write(&writer)) return {};
|
||||
if (writer.bytes_written() != buffer_size) return {};
|
||||
|
||||
return {std::move(buffer), buffer_size};
|
||||
}
|
||||
|
||||
class V8_EXPORT_PRIVATE NativeModuleDeserializer {
|
||||
public:
|
||||
NativeModuleDeserializer() = delete;
|
||||
NativeModuleDeserializer(Isolate*, NativeModule*);
|
||||
|
||||
bool Read(Reader* reader);
|
||||
|
||||
private:
|
||||
bool ReadHeader(Reader* reader);
|
||||
bool ReadCode(uint32_t fn_index, Reader* reader);
|
||||
bool ReadStubs(Reader* reader);
|
||||
Address GetTrampolineOrStubFromTag(uint32_t);
|
||||
|
||||
Isolate* const isolate_;
|
||||
NativeModule* const native_module_;
|
||||
|
||||
std::vector<Address> stubs_;
|
||||
bool read_called_;
|
||||
|
||||
DISALLOW_COPY_AND_ASSIGN(NativeModuleDeserializer);
|
||||
};
|
||||
|
||||
NativeModuleDeserializer::NativeModuleDeserializer(Isolate* isolate,
|
||||
NativeModule* native_module)
|
||||
: isolate_(isolate), native_module_(native_module) {}
|
||||
: isolate_(isolate), native_module_(native_module), read_called_(false) {}
|
||||
|
||||
void NativeModuleDeserializer::Expect(size_t size) {
|
||||
scratch_.resize(size);
|
||||
current_expectation_ = size;
|
||||
unread_ = {scratch_.data(), size};
|
||||
}
|
||||
bool NativeModuleDeserializer::Read(Reader* reader) {
|
||||
DCHECK(!read_called_);
|
||||
read_called_ = true;
|
||||
|
||||
bool NativeModuleDeserializer::Read(Vector<const byte> data) {
|
||||
unread_ = data;
|
||||
if (!ReadHeader()) return false;
|
||||
if (!ReadStubs()) return false;
|
||||
index_ = native_module_->num_imported_functions();
|
||||
for (; index_ < native_module_->FunctionCount(); ++index_) {
|
||||
if (!ReadCode()) return false;
|
||||
if (!ReadHeader(reader)) return false;
|
||||
if (!ReadStubs(reader)) return false;
|
||||
uint32_t total_fns = native_module_->FunctionCount();
|
||||
uint32_t first_wasm_fn = native_module_->num_imported_functions();
|
||||
for (uint32_t i = first_wasm_fn; i < total_fns; ++i) {
|
||||
if (!ReadCode(i, reader)) return false;
|
||||
}
|
||||
return data.size() - unread_.size();
|
||||
return reader->current_size() == 0;
|
||||
}
|
||||
|
||||
bool NativeModuleDeserializer::ReadHeader() {
|
||||
size_t start_size = unread_.size();
|
||||
Reader reader(unread_);
|
||||
size_t functions = reader.Read<uint32_t>();
|
||||
size_t imports = reader.Read<uint32_t>();
|
||||
bool ok = functions == native_module_->FunctionCount() &&
|
||||
bool NativeModuleDeserializer::ReadHeader(Reader* reader) {
|
||||
size_t functions = reader->Read<uint32_t>();
|
||||
size_t imports = reader->Read<uint32_t>();
|
||||
return functions == native_module_->FunctionCount() &&
|
||||
imports == native_module_->num_imported_functions();
|
||||
if (!ok) return false;
|
||||
|
||||
unread_ = unread_ + (start_size - reader.current_buffer().size());
|
||||
return true;
|
||||
}
|
||||
|
||||
bool NativeModuleDeserializer::ReadStubs() {
|
||||
size_t start_size = unread_.size();
|
||||
Reader reader(unread_);
|
||||
size_t nr_stubs = reader.Read<uint32_t>();
|
||||
stubs_.reserve(nr_stubs);
|
||||
for (size_t i = 0; i < nr_stubs; ++i) {
|
||||
uint32_t key = reader.Read<uint32_t>();
|
||||
bool NativeModuleDeserializer::ReadStubs(Reader* reader) {
|
||||
size_t num_stubs = reader->Read<uint32_t>();
|
||||
stubs_.reserve(num_stubs);
|
||||
for (size_t i = 0; i < num_stubs; ++i) {
|
||||
uint32_t key = reader->Read<uint32_t>();
|
||||
v8::internal::Code* stub =
|
||||
*(v8::internal::CodeStub::GetCode(isolate_, key).ToHandleChecked());
|
||||
stubs_.push_back(native_module_->GetLocalAddressFor(handle(stub)));
|
||||
}
|
||||
unread_ = unread_ + (start_size - reader.current_buffer().size());
|
||||
return true;
|
||||
}
|
||||
|
||||
bool NativeModuleDeserializer::ReadCode() {
|
||||
size_t start_size = unread_.size();
|
||||
Reader reader(unread_);
|
||||
size_t code_section_size = reader.Read<size_t>();
|
||||
bool NativeModuleDeserializer::ReadCode(uint32_t fn_index, Reader* reader) {
|
||||
size_t code_section_size = reader->Read<size_t>();
|
||||
USE(code_section_size);
|
||||
size_t constant_pool_offset = reader.Read<size_t>();
|
||||
size_t safepoint_table_offset = reader.Read<size_t>();
|
||||
size_t handler_table_offset = reader.Read<size_t>();
|
||||
uint32_t stack_slot_count = reader.Read<uint32_t>();
|
||||
size_t code_size = reader.Read<size_t>();
|
||||
size_t reloc_size = reader.Read<size_t>();
|
||||
size_t source_position_size = reader.Read<size_t>();
|
||||
size_t protected_instructions_size = reader.Read<size_t>();
|
||||
WasmCode::Tier tier = reader.Read<WasmCode::Tier>();
|
||||
reader.Align(kPointerSize);
|
||||
size_t constant_pool_offset = reader->Read<size_t>();
|
||||
size_t safepoint_table_offset = reader->Read<size_t>();
|
||||
size_t handler_table_offset = reader->Read<size_t>();
|
||||
uint32_t stack_slot_count = reader->Read<uint32_t>();
|
||||
size_t code_size = reader->Read<size_t>();
|
||||
size_t reloc_size = reader->Read<size_t>();
|
||||
size_t source_position_size = reader->Read<size_t>();
|
||||
size_t protected_instructions_size = reader->Read<size_t>();
|
||||
WasmCode::Tier tier = reader->Read<WasmCode::Tier>();
|
||||
|
||||
std::shared_ptr<ProtectedInstructions> protected_instructions(
|
||||
new ProtectedInstructions(protected_instructions_size));
|
||||
DCHECK_EQ(protected_instructions_size, protected_instructions->size());
|
||||
|
||||
Vector<const byte> code_buffer = reader.GetSubvector(code_size);
|
||||
Vector<const byte> code_buffer = {reader->current_location(), code_size};
|
||||
reader->Skip(code_size);
|
||||
|
||||
std::unique_ptr<byte[]> reloc_info;
|
||||
if (reloc_size > 0) {
|
||||
reloc_info.reset(new byte[reloc_size]);
|
||||
reader.ReadIntoVector({reloc_info.get(), reloc_size});
|
||||
reader->ReadVector({reloc_info.get(), reloc_size});
|
||||
}
|
||||
std::unique_ptr<byte[]> source_pos;
|
||||
if (source_position_size > 0) {
|
||||
source_pos.reset(new byte[source_position_size]);
|
||||
reader.ReadIntoVector({source_pos.get(), source_position_size});
|
||||
reader->ReadVector({source_pos.get(), source_position_size});
|
||||
}
|
||||
WasmCode* ret = native_module_->AddOwnedCode(
|
||||
code_buffer, std::move(reloc_info), reloc_size, std::move(source_pos),
|
||||
source_position_size, Just(index_), WasmCode::kFunction,
|
||||
source_position_size, Just(fn_index), WasmCode::kFunction,
|
||||
constant_pool_offset, stack_slot_count, safepoint_table_offset,
|
||||
handler_table_offset, protected_instructions, tier,
|
||||
WasmCode::kNoFlushICache);
|
||||
native_module_->code_table_[index_] = ret;
|
||||
native_module_->code_table_[fn_index] = ret;
|
||||
|
||||
// now relocate the code
|
||||
int mask = RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT) |
|
||||
@ -649,12 +552,12 @@ bool NativeModuleDeserializer::ReadCode() {
|
||||
ret->instructions().size());
|
||||
|
||||
if (protected_instructions_size > 0) {
|
||||
reader.ReadIntoVector(
|
||||
{reinterpret_cast<byte*>(protected_instructions->data()),
|
||||
sizeof(trap_handler::ProtectedInstructionData) *
|
||||
protected_instructions->size()});
|
||||
size_t size = sizeof(trap_handler::ProtectedInstructionData) *
|
||||
protected_instructions->size();
|
||||
Vector<byte> data(reinterpret_cast<byte*>(protected_instructions->data()),
|
||||
size);
|
||||
reader->ReadVector(data);
|
||||
}
|
||||
unread_ = unread_ + (start_size - reader.current_buffer().size());
|
||||
return true;
|
||||
}
|
||||
|
||||
@ -677,7 +580,6 @@ MaybeHandle<WasmCompiledModule> DeserializeNativeModule(
|
||||
if (!IsSupportedVersion(isolate, data)) {
|
||||
return {};
|
||||
}
|
||||
data = data + kVersionSize;
|
||||
ModuleResult decode_result =
|
||||
SyncDecodeWasmModule(isolate, wire_bytes.start(), wire_bytes.end(), false,
|
||||
i::wasm::kWasmOrigin);
|
||||
@ -716,11 +618,13 @@ MaybeHandle<WasmCompiledModule> DeserializeNativeModule(
|
||||
script->set_wasm_compiled_module(*compiled_module);
|
||||
NativeModuleDeserializer deserializer(isolate,
|
||||
compiled_module->GetNativeModule());
|
||||
if (!deserializer.Read(data)) return {};
|
||||
|
||||
Reader reader(data + kVersionSize);
|
||||
if (!deserializer.Read(&reader)) return {};
|
||||
|
||||
// TODO(6792): Wrappers below might be cloned using {Factory::CopyCode}. This
|
||||
// requires unlocking the code space here. This should be moved into the
|
||||
// allocator eventually.
|
||||
// requires unlocking the code space here. This should eventually be moved
|
||||
// into the allocator.
|
||||
CodeSpaceMemoryModificationScope modification_scope(isolate->heap());
|
||||
CompileJsToWasmWrappers(isolate, compiled_module, isolate->counters());
|
||||
WasmCompiledModule::ReinitializeAfterDeserialization(isolate,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user