Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 1 | // Copyright 2014 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | |
| 6 | #include "src/snapshot-source-sink.h" |
| 7 | |
| 8 | #include "src/base/logging.h" |
| 9 | #include "src/handles-inl.h" |
| 10 | #include "src/serialize.h" // for SerializerDeserializer::nop() in AtEOF() |
| 11 | |
| 12 | |
| 13 | namespace v8 { |
| 14 | namespace internal { |
| 15 | |
| 16 | |
| 17 | SnapshotByteSource::SnapshotByteSource(const byte* array, int length) |
| 18 | : data_(array), length_(length), position_(0) { |
| 19 | } |
| 20 | |
| 21 | |
| 22 | SnapshotByteSource::~SnapshotByteSource() { } |
| 23 | |
| 24 | |
| 25 | int32_t SnapshotByteSource::GetUnalignedInt() { |
| 26 | DCHECK(position_ < length_); // Require at least one byte left. |
| 27 | int32_t answer = data_[position_]; |
| 28 | answer |= data_[position_ + 1] << 8; |
| 29 | answer |= data_[position_ + 2] << 16; |
| 30 | answer |= data_[position_ + 3] << 24; |
| 31 | return answer; |
| 32 | } |
| 33 | |
| 34 | |
| 35 | void SnapshotByteSource::CopyRaw(byte* to, int number_of_bytes) { |
| 36 | MemCopy(to, data_ + position_, number_of_bytes); |
| 37 | position_ += number_of_bytes; |
| 38 | } |
| 39 | |
| 40 | |
| 41 | void SnapshotByteSink::PutInt(uintptr_t integer, const char* description) { |
| 42 | DCHECK(integer < 1 << 22); |
| 43 | integer <<= 2; |
| 44 | int bytes = 1; |
| 45 | if (integer > 0xff) bytes = 2; |
| 46 | if (integer > 0xffff) bytes = 3; |
| 47 | integer |= bytes; |
| 48 | Put(static_cast<int>(integer & 0xff), "IntPart1"); |
| 49 | if (bytes > 1) Put(static_cast<int>((integer >> 8) & 0xff), "IntPart2"); |
| 50 | if (bytes > 2) Put(static_cast<int>((integer >> 16) & 0xff), "IntPart3"); |
| 51 | } |
| 52 | |
| 53 | void SnapshotByteSink::PutRaw(byte* data, int number_of_bytes, |
| 54 | const char* description) { |
| 55 | for (int i = 0; i < number_of_bytes; ++i) { |
| 56 | Put(data[i], description); |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | void SnapshotByteSink::PutBlob(byte* data, int number_of_bytes, |
| 61 | const char* description) { |
| 62 | PutInt(number_of_bytes, description); |
| 63 | PutRaw(data, number_of_bytes, description); |
| 64 | } |
| 65 | |
| 66 | |
| 67 | bool SnapshotByteSource::AtEOF() { |
| 68 | if (0u + length_ - position_ > 2 * sizeof(uint32_t)) return false; |
| 69 | for (int x = position_; x < length_; x++) { |
| 70 | if (data_[x] != SerializerDeserializer::nop()) return false; |
| 71 | } |
| 72 | return true; |
| 73 | } |
| 74 | |
| 75 | |
| 76 | bool SnapshotByteSource::GetBlob(const byte** data, int* number_of_bytes) { |
| 77 | int size = GetInt(); |
| 78 | *number_of_bytes = size; |
| 79 | |
| 80 | if (position_ + size < length_) { |
| 81 | *data = &data_[position_]; |
| 82 | Advance(size); |
| 83 | return true; |
| 84 | } else { |
| 85 | Advance(length_ - position_); // proceed until end. |
| 86 | return false; |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | |
| 91 | void DebugSnapshotSink::Put(byte b, const char* description) { |
| 92 | PrintF("%24s: %x\n", description, b); |
| 93 | sink_->Put(b, description); |
| 94 | } |
| 95 | |
| 96 | } // namespace v8::internal |
| 97 | } // namespace v8 |