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
99
100
101
102
103
|
// Copyright 2015 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_SIGNATURE_H_
#define V8_SIGNATURE_H_
#include "src/base/iterator.h"
#include "src/zone/zone.h"
namespace v8 {
namespace internal {
// Describes the inputs and outputs of a function or call.
template <typename T>
class Signature : public ZoneObject {
public:
Signature(size_t return_count, size_t parameter_count, const T* reps)
: return_count_(return_count),
parameter_count_(parameter_count),
reps_(reps) {}
size_t return_count() const { return return_count_; }
size_t parameter_count() const { return parameter_count_; }
T GetParam(size_t index) const {
DCHECK(index < parameter_count_);
return reps_[return_count_ + index];
}
T GetReturn(size_t index = 0) const {
DCHECK(index < return_count_);
return reps_[index];
}
// Iteration support.
base::iterator_range<const T*> parameters() const {
return {reps_ + return_count_, reps_ + return_count_ + parameter_count_};
}
base::iterator_range<const T*> returns() const {
return {reps_, reps_ + return_count_};
}
base::iterator_range<const T*> all() const {
return {reps_, reps_ + return_count_ + parameter_count_};
}
bool Equals(const Signature* that) const {
if (this == that) return true;
if (this->parameter_count() != that->parameter_count()) return false;
if (this->return_count() != that->return_count()) return false;
size_t size = this->return_count() + this->parameter_count();
for (size_t i = 0; i < size; i++) {
if (this->reps_[i] != that->reps_[i]) return false;
}
return true;
}
// For incrementally building signatures.
class Builder {
public:
Builder(Zone* zone, size_t return_count, size_t parameter_count)
: return_count_(return_count),
parameter_count_(parameter_count),
zone_(zone),
rcursor_(0),
pcursor_(0),
buffer_(zone->NewArray<T>(
static_cast<int>(return_count + parameter_count))) {}
const size_t return_count_;
const size_t parameter_count_;
void AddReturn(T val) {
DCHECK(rcursor_ < return_count_);
buffer_[rcursor_++] = val;
}
void AddParam(T val) {
DCHECK(pcursor_ < parameter_count_);
buffer_[return_count_ + pcursor_++] = val;
}
Signature<T>* Build() {
DCHECK(rcursor_ == return_count_);
DCHECK(pcursor_ == parameter_count_);
return new (zone_) Signature<T>(return_count_, parameter_count_, buffer_);
}
private:
Zone* zone_;
size_t rcursor_;
size_t pcursor_;
T* buffer_;
};
protected:
size_t return_count_;
size_t parameter_count_;
const T* reps_;
};
} // namespace internal
} // namespace v8
#endif // V8_SIGNATURE_H_
|
