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Issue 781443002: Encode reservation meta data in the snapshot blob. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@snapshotformat
Patch Set: rebased Created 6 years ago
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1 // Copyright 2014 the V8 project authors. All rights reserved. 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 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 5
6 #include "src/snapshot-source-sink.h" 6 #include "src/snapshot-source-sink.h"
7 7
8 #include "src/base/logging.h" 8 #include "src/base/logging.h"
9 #include "src/handles-inl.h" 9 #include "src/handles-inl.h"
10 #include "src/serialize.h" // for SerializerDeserializer::nop() in AtEOF() 10 #include "src/serialize.h" // for SerializerDeserializer::nop() in AtEOF()
11 11
12 12
13 namespace v8 { 13 namespace v8 {
14 namespace internal { 14 namespace internal {
15 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() { 16 int32_t SnapshotByteSource::GetUnalignedInt() {
26 DCHECK(position_ < length_); // Require at least one byte left. 17 DCHECK(position_ < length_); // Require at least one byte left.
27 int32_t answer = data_[position_]; 18 int32_t answer = data_[position_];
28 answer |= data_[position_ + 1] << 8; 19 answer |= data_[position_ + 1] << 8;
29 answer |= data_[position_ + 2] << 16; 20 answer |= data_[position_ + 2] << 16;
30 answer |= data_[position_ + 3] << 24; 21 answer |= data_[position_ + 3] << 24;
31 return answer; 22 return answer;
32 } 23 }
33 24
34 25
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45 if (integer > 0xff) bytes = 2; 36 if (integer > 0xff) bytes = 2;
46 if (integer > 0xffff) bytes = 3; 37 if (integer > 0xffff) bytes = 3;
47 if (integer > 0xffffff) bytes = 4; 38 if (integer > 0xffffff) bytes = 4;
48 integer |= (bytes - 1); 39 integer |= (bytes - 1);
49 Put(static_cast<int>(integer & 0xff), "IntPart1"); 40 Put(static_cast<int>(integer & 0xff), "IntPart1");
50 if (bytes > 1) Put(static_cast<int>((integer >> 8) & 0xff), "IntPart2"); 41 if (bytes > 1) Put(static_cast<int>((integer >> 8) & 0xff), "IntPart2");
51 if (bytes > 2) Put(static_cast<int>((integer >> 16) & 0xff), "IntPart3"); 42 if (bytes > 2) Put(static_cast<int>((integer >> 16) & 0xff), "IntPart3");
52 if (bytes > 3) Put(static_cast<int>((integer >> 24) & 0xff), "IntPart4"); 43 if (bytes > 3) Put(static_cast<int>((integer >> 24) & 0xff), "IntPart4");
53 } 44 }
54 45
55 void SnapshotByteSink::PutRaw(byte* data, int number_of_bytes, 46
47 void SnapshotByteSink::PutRaw(const byte* data, int number_of_bytes,
56 const char* description) { 48 const char* description) {
57 data_.AddAll(Vector<byte>(data, number_of_bytes)); 49 data_.AddAll(Vector<byte>(const_cast<byte*>(data), number_of_bytes));
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 } 50 }
65 51
66 52
53 void SnapshotByteSink::PutBlob(Vector<const byte> blob,
54 const char* description) {
55 PutInt(blob.length(), description);
56 PutRaw(blob.start(), blob.length(), description);
57 }
58
59
67 bool SnapshotByteSource::AtEOF() { 60 bool SnapshotByteSource::AtEOF() {
68 if (0u + length_ - position_ > 2 * sizeof(uint32_t)) return false; 61 if (0u + length_ - position_ > 2 * sizeof(uint32_t)) return false;
69 for (int x = position_; x < length_; x++) { 62 for (int x = position_; x < length_; x++) {
70 if (data_[x] != SerializerDeserializer::nop()) return false; 63 if (data_[x] != SerializerDeserializer::nop()) return false;
71 } 64 }
72 return true; 65 return true;
73 } 66 }
74 67
75 68
76 bool SnapshotByteSource::GetBlob(const byte** data, int* number_of_bytes) { 69 bool SnapshotByteSource::GetBlob(const byte** data, int* number_of_bytes) {
77 int size = GetInt(); 70 int size = GetInt();
78 *number_of_bytes = size; 71 *number_of_bytes = size;
79 72
80 if (position_ + size < length_) { 73 if (position_ + size < length_) {
81 *data = &data_[position_]; 74 *data = &data_[position_];
82 Advance(size); 75 Advance(size);
83 return true; 76 return true;
84 } else { 77 } else {
85 Advance(length_ - position_); // proceed until end. 78 Advance(length_ - position_); // proceed until end.
86 return false; 79 return false;
87 } 80 }
88 } 81 }
89 82
90 } // namespace v8::internal 83 } // namespace v8::internal
91 } // namespace v8 84 } // namespace v8
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