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Issue 328693003: Revert "Support external startup data in V8." (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Fix brace. Created 6 years, 6 months ago
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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 #include "src/checks.h"
8
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 ASSERT(position_ < length_); // Require at least one byte left.
27 #if defined(V8_HOST_CAN_READ_UNALIGNED) && __BYTE_ORDER == __LITTLE_ENDIAN
28 int32_t answer = *reinterpret_cast<const int32_t*>(data_ + position_);
29 #else
30 int32_t answer = data_[position_];
31 answer |= data_[position_ + 1] << 8;
32 answer |= data_[position_ + 2] << 16;
33 answer |= data_[position_ + 3] << 24;
34 #endif
35 return answer;
36 }
37
38
39 void SnapshotByteSource::CopyRaw(byte* to, int number_of_bytes) {
40 MemCopy(to, data_ + position_, number_of_bytes);
41 position_ += number_of_bytes;
42 }
43
44
45 void SnapshotByteSink::PutInt(uintptr_t integer, const char* description) {
46 ASSERT(integer < 1 << 22);
47 integer <<= 2;
48 int bytes = 1;
49 if (integer > 0xff) bytes = 2;
50 if (integer > 0xffff) bytes = 3;
51 integer |= bytes;
52 Put(static_cast<int>(integer & 0xff), "IntPart1");
53 if (bytes > 1) Put(static_cast<int>((integer >> 8) & 0xff), "IntPart2");
54 if (bytes > 2) Put(static_cast<int>((integer >> 16) & 0xff), "IntPart3");
55 }
56
57 void SnapshotByteSink::PutRaw(byte* data, int number_of_bytes,
58 const char* description) {
59 for (int i = 0; i < number_of_bytes; ++i) {
60 Put(data[i], description);
61 }
62 }
63
64 void SnapshotByteSink::PutBlob(byte* data, int number_of_bytes,
65 const char* description) {
66 PutInt(number_of_bytes, description);
67 PutRaw(data, number_of_bytes, description);
68 }
69
70
71 bool SnapshotByteSource::AtEOF() {
72 if (0u + length_ - position_ > 2 * sizeof(uint32_t)) return false;
73 for (int x = position_; x < length_; x++) {
74 if (data_[x] != SerializerDeserializer::nop()) return false;
75 }
76 return true;
77 }
78
79
80 bool SnapshotByteSource::GetBlob(const byte** data, int* number_of_bytes) {
81 int size = GetInt();
82 *number_of_bytes = size;
83
84 if (position_ + size < length_) {
85 *data = &data_[position_];
86 Advance(size);
87 return true;
88 } else {
89 Advance(length_ - position_); // proceed until end.
90 return false;
91 }
92 }
93
94 } // namespace v8::internal
95 } // namespace v8
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