| // Copyright 2014 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/snapshot-source-sink.h" |
| |
| #include "src/base/logging.h" |
| #include "src/handles-inl.h" |
| #include "src/serialize.h" // for SerializerDeserializer::nop() in AtEOF() |
| |
| |
| namespace v8 { |
| namespace internal { |
| |
| int32_t SnapshotByteSource::GetUnalignedInt() { |
| DCHECK(position_ < length_); // Require at least one byte left. |
| int32_t answer = data_[position_]; |
| answer |= data_[position_ + 1] << 8; |
| answer |= data_[position_ + 2] << 16; |
| answer |= data_[position_ + 3] << 24; |
| return answer; |
| } |
| |
| |
| void SnapshotByteSource::CopyRaw(byte* to, int number_of_bytes) { |
| MemCopy(to, data_ + position_, number_of_bytes); |
| position_ += number_of_bytes; |
| } |
| |
| |
| void SnapshotByteSink::PutInt(uintptr_t integer, const char* description) { |
| DCHECK(integer < 1 << 30); |
| integer <<= 2; |
| int bytes = 1; |
| if (integer > 0xff) bytes = 2; |
| if (integer > 0xffff) bytes = 3; |
| if (integer > 0xffffff) bytes = 4; |
| integer |= (bytes - 1); |
| Put(static_cast<int>(integer & 0xff), "IntPart1"); |
| if (bytes > 1) Put(static_cast<int>((integer >> 8) & 0xff), "IntPart2"); |
| if (bytes > 2) Put(static_cast<int>((integer >> 16) & 0xff), "IntPart3"); |
| if (bytes > 3) Put(static_cast<int>((integer >> 24) & 0xff), "IntPart4"); |
| } |
| |
| |
| void SnapshotByteSink::PutRaw(const byte* data, int number_of_bytes, |
| const char* description) { |
| data_.AddAll(Vector<byte>(const_cast<byte*>(data), number_of_bytes)); |
| } |
| |
| |
| bool SnapshotByteSource::AtEOF() { |
| if (0u + length_ - position_ > 2 * sizeof(uint32_t)) return false; |
| for (int x = position_; x < length_; x++) { |
| if (data_[x] != SerializerDeserializer::nop()) return false; |
| } |
| return true; |
| } |
| |
| |
| bool SnapshotByteSource::GetBlob(const byte** data, int* number_of_bytes) { |
| int size = GetInt(); |
| *number_of_bytes = size; |
| |
| if (position_ + size <= length_) { |
| *data = &data_[position_]; |
| Advance(size); |
| return true; |
| } else { |
| Advance(length_ - position_); // proceed until end. |
| return false; |
| } |
| } |
| |
| } // namespace v8::internal |
| } // namespace v8 |