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
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
// 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_COMPILER_FRAME_STATES_H_
#define V8_COMPILER_FRAME_STATES_H_
#include "src/handles.h"
#include "src/utils.h"
namespace v8 {
namespace internal {
// Forward declarations.
class SharedFunctionInfo;
namespace compiler {
// Flag that describes how to combine the current environment with
// the output of a node to obtain a framestate for lazy bailout.
class OutputFrameStateCombine {
public:
enum Kind {
kPushOutput, // Push the output on the expression stack.
kPokeAt // Poke at the given environment location,
// counting from the top of the stack.
};
static OutputFrameStateCombine Ignore() {
return OutputFrameStateCombine(kPushOutput, 0);
}
static OutputFrameStateCombine Push(size_t count = 1) {
return OutputFrameStateCombine(kPushOutput, count);
}
static OutputFrameStateCombine PokeAt(size_t index) {
return OutputFrameStateCombine(kPokeAt, index);
}
Kind kind() const { return kind_; }
size_t GetPushCount() const {
DCHECK_EQ(kPushOutput, kind());
return parameter_;
}
size_t GetOffsetToPokeAt() const {
DCHECK_EQ(kPokeAt, kind());
return parameter_;
}
bool IsOutputIgnored() const {
return kind_ == kPushOutput && parameter_ == 0;
}
size_t ConsumedOutputCount() const {
return kind_ == kPushOutput ? GetPushCount() : 1;
}
bool operator==(OutputFrameStateCombine const& other) const {
return kind_ == other.kind_ && parameter_ == other.parameter_;
}
bool operator!=(OutputFrameStateCombine const& other) const {
return !(*this == other);
}
friend size_t hash_value(OutputFrameStateCombine const&);
friend std::ostream& operator<<(std::ostream&,
OutputFrameStateCombine const&);
private:
OutputFrameStateCombine(Kind kind, size_t parameter)
: kind_(kind), parameter_(parameter) {}
Kind const kind_;
size_t const parameter_;
};
// The type of stack frame that a FrameState node represents.
enum class FrameStateType {
kJavaScriptFunction, // Represents an unoptimized JavaScriptFrame.
kInterpretedFunction, // Represents an InterpretedFrame.
kArgumentsAdaptor, // Represents an ArgumentsAdaptorFrame.
kTailCallerFunction, // Represents a frame removed by tail call elimination.
kConstructStub // Represents a ConstructStubFrame.
};
class FrameStateFunctionInfo {
public:
FrameStateFunctionInfo(FrameStateType type, int parameter_count,
int local_count,
Handle<SharedFunctionInfo> shared_info)
: type_(type),
parameter_count_(parameter_count),
local_count_(local_count),
shared_info_(shared_info) {}
int local_count() const { return local_count_; }
int parameter_count() const { return parameter_count_; }
Handle<SharedFunctionInfo> shared_info() const { return shared_info_; }
FrameStateType type() const { return type_; }
static bool IsJSFunctionType(FrameStateType type) {
return type == FrameStateType::kJavaScriptFunction ||
type == FrameStateType::kInterpretedFunction;
}
private:
FrameStateType const type_;
int const parameter_count_;
int const local_count_;
Handle<SharedFunctionInfo> const shared_info_;
};
class FrameStateInfo final {
public:
FrameStateInfo(BailoutId bailout_id, OutputFrameStateCombine state_combine,
const FrameStateFunctionInfo* info)
: bailout_id_(bailout_id),
frame_state_combine_(state_combine),
info_(info) {}
FrameStateType type() const {
return info_ == nullptr ? FrameStateType::kJavaScriptFunction
: info_->type();
}
BailoutId bailout_id() const { return bailout_id_; }
OutputFrameStateCombine state_combine() const { return frame_state_combine_; }
MaybeHandle<SharedFunctionInfo> shared_info() const {
return info_ == nullptr ? MaybeHandle<SharedFunctionInfo>()
: info_->shared_info();
}
int parameter_count() const {
return info_ == nullptr ? 0 : info_->parameter_count();
}
int local_count() const {
return info_ == nullptr ? 0 : info_->local_count();
}
const FrameStateFunctionInfo* function_info() const { return info_; }
private:
BailoutId const bailout_id_;
OutputFrameStateCombine const frame_state_combine_;
const FrameStateFunctionInfo* const info_;
};
bool operator==(FrameStateInfo const&, FrameStateInfo const&);
bool operator!=(FrameStateInfo const&, FrameStateInfo const&);
size_t hash_value(FrameStateInfo const&);
std::ostream& operator<<(std::ostream&, FrameStateInfo const&);
static const int kFrameStateParametersInput = 0;
static const int kFrameStateLocalsInput = 1;
static const int kFrameStateStackInput = 2;
static const int kFrameStateContextInput = 3;
static const int kFrameStateFunctionInput = 4;
static const int kFrameStateOuterStateInput = 5;
static const int kFrameStateInputCount = kFrameStateOuterStateInput + 1;
} // namespace compiler
} // namespace internal
} // namespace v8
#endif // V8_COMPILER_FRAME_STATES_H_
|
