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 98
