forked from v8/v8
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathbytecode-offset-iterator.h
More file actions
98 lines (79 loc) · 2.83 KB
/
bytecode-offset-iterator.h
File metadata and controls
98 lines (79 loc) · 2.83 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
// Copyright 2021 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.
#ifndef V8_BASELINE_BYTECODE_OFFSET_ITERATOR_H_
#define V8_BASELINE_BYTECODE_OFFSET_ITERATOR_H_
#include "src/base/vlq.h"
#include "src/common/globals.h"
#include "src/interpreter/bytecode-array-iterator.h"
#include "src/objects/code.h"
#include "src/objects/fixed-array.h"
namespace v8 {
namespace internal {
class BytecodeArray;
namespace baseline {
class V8_EXPORT_PRIVATE BytecodeOffsetIterator {
public:
explicit BytecodeOffsetIterator(Handle<ByteArray> mapping_table,
Handle<BytecodeArray> bytecodes);
// Non-handlified version for use when no GC can happen.
explicit BytecodeOffsetIterator(ByteArray mapping_table,
BytecodeArray bytecodes);
~BytecodeOffsetIterator();
inline void Advance() {
DCHECK(!done());
current_pc_start_offset_ = current_pc_end_offset_;
current_pc_end_offset_ += ReadPosition();
current_bytecode_offset_ = bytecode_iterator_.current_offset();
bytecode_iterator_.Advance();
}
inline void AdvanceToBytecodeOffset(int bytecode_offset) {
while (current_bytecode_offset() < bytecode_offset) {
Advance();
}
DCHECK_EQ(bytecode_offset, current_bytecode_offset());
}
inline void AdvanceToPCOffset(Address pc_offset) {
while (current_pc_end_offset() < pc_offset) {
Advance();
}
DCHECK_GT(pc_offset, current_pc_start_offset());
DCHECK_LE(pc_offset, current_pc_end_offset());
}
// For this iterator, done() means that it is not safe to Advance().
// Values are cached, so reads are always allowed.
inline bool done() const { return current_index_ >= data_length_; }
inline Address current_pc_start_offset() const {
return current_pc_start_offset_;
}
inline Address current_pc_end_offset() const {
return current_pc_end_offset_;
}
inline int current_bytecode_offset() const {
return current_bytecode_offset_;
}
static void UpdatePointersCallback(void* iterator) {
reinterpret_cast<BytecodeOffsetIterator*>(iterator)->UpdatePointers();
}
void UpdatePointers();
private:
void Initialize();
inline int ReadPosition() {
return base::VLQDecodeUnsigned(data_start_address_, ¤t_index_);
}
Handle<ByteArray> mapping_table_;
byte* data_start_address_;
int data_length_;
int current_index_;
Address current_pc_start_offset_;
Address current_pc_end_offset_;
int current_bytecode_offset_;
BytecodeArray bytecode_handle_storage_;
interpreter::BytecodeArrayIterator bytecode_iterator_;
LocalHeap* local_heap_;
base::Optional<DisallowGarbageCollection> no_gc_;
};
} // namespace baseline
} // namespace internal
} // namespace v8
#endif // V8_BASELINE_BYTECODE_OFFSET_ITERATOR_H_