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
|
// Copyright 2019 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.
#include "src/compiler/map-inference.h"
#include "src/compiler/compilation-dependencies.h"
#include "src/compiler/feedback-source.h"
#include "src/compiler/js-graph.h"
#include "src/compiler/simplified-operator.h"
#include "src/objects/map-inl.h"
namespace v8 {
namespace internal {
namespace compiler {
MapInference::MapInference(JSHeapBroker* broker, Node* object, Effect effect)
: broker_(broker), object_(object), maps_(broker->zone()) {
ZoneRefUnorderedSet<MapRef> maps(broker->zone());
auto result =
NodeProperties::InferMapsUnsafe(broker_, object_, effect, &maps);
maps_.insert(maps_.end(), maps.begin(), maps.end());
maps_state_ = (result == NodeProperties::kUnreliableMaps)
? kUnreliableDontNeedGuard
: kReliableOrGuarded;
DCHECK_EQ(maps_.empty(), result == NodeProperties::kNoMaps);
}
MapInference::~MapInference() { CHECK(Safe()); }
bool MapInference::Safe() const { return maps_state_ != kUnreliableNeedGuard; }
void MapInference::SetNeedGuardIfUnreliable() {
CHECK(HaveMaps());
if (maps_state_ == kUnreliableDontNeedGuard) {
maps_state_ = kUnreliableNeedGuard;
}
}
void MapInference::SetGuarded() { maps_state_ = kReliableOrGuarded; }
bool MapInference::HaveMaps() const { return !maps_.empty(); }
bool MapInference::AllOfInstanceTypesAreJSReceiver() const {
return AllOfInstanceTypesUnsafe(
static_cast<bool (*)(InstanceType)>(&InstanceTypeChecker::IsJSReceiver));
}
bool MapInference::AllOfInstanceTypesAre(InstanceType type) const {
CHECK(!InstanceTypeChecker::IsString(type));
return AllOfInstanceTypesUnsafe(
[type](InstanceType other) { return type == other; });
}
bool MapInference::AnyOfInstanceTypesAre(InstanceType type) const {
CHECK(!InstanceTypeChecker::IsString(type));
return AnyOfInstanceTypesUnsafe(
[type](InstanceType other) { return type == other; });
}
bool MapInference::AllOfInstanceTypes(std::function<bool(InstanceType)> f) {
SetNeedGuardIfUnreliable();
return AllOfInstanceTypesUnsafe(f);
}
bool MapInference::AllOfInstanceTypesUnsafe(
std::function<bool(InstanceType)> f) const {
CHECK(HaveMaps());
auto instance_type = [f](const MapRef& map) {
return f(map.instance_type());
};
return std::all_of(maps_.begin(), maps_.end(), instance_type);
}
bool MapInference::AnyOfInstanceTypesUnsafe(
std::function<bool(InstanceType)> f) const {
CHECK(HaveMaps());
auto instance_type = [f](const MapRef& map) {
return f(map.instance_type());
};
return std::any_of(maps_.begin(), maps_.end(), instance_type);
}
ZoneVector<MapRef> const& MapInference::GetMaps() {
SetNeedGuardIfUnreliable();
return maps_;
}
bool MapInference::Is(const MapRef& expected_map) {
if (!HaveMaps()) return false;
const ZoneVector<MapRef>& maps = GetMaps();
if (maps.size() != 1) return false;
return maps[0].equals(expected_map);
}
void MapInference::InsertMapChecks(JSGraph* jsgraph, Effect* effect,
Control control,
const FeedbackSource& feedback) {
CHECK(HaveMaps());
CHECK(feedback.IsValid());
ZoneHandleSet<Map> maps;
for (const MapRef& map : maps_) {
maps.insert(map.object(), jsgraph->graph()->zone());
}
*effect = jsgraph->graph()->NewNode(
jsgraph->simplified()->CheckMaps(CheckMapsFlag::kNone, maps, feedback),
object_, *effect, control);
SetGuarded();
}
bool MapInference::RelyOnMapsViaStability(
CompilationDependencies* dependencies) {
CHECK(HaveMaps());
return RelyOnMapsHelper(dependencies, nullptr, nullptr, Control{nullptr}, {});
}
bool MapInference::RelyOnMapsPreferStability(
CompilationDependencies* dependencies, JSGraph* jsgraph, Effect* effect,
Control control, const FeedbackSource& feedback) {
CHECK(HaveMaps());
if (Safe()) return false;
if (RelyOnMapsViaStability(dependencies)) return true;
CHECK(RelyOnMapsHelper(nullptr, jsgraph, effect, control, feedback));
return false;
}
bool MapInference::RelyOnMapsHelper(CompilationDependencies* dependencies,
JSGraph* jsgraph, Effect* effect,
Control control,
const FeedbackSource& feedback) {
if (Safe()) return true;
auto is_stable = [](const MapRef& map) { return map.is_stable(); };
if (dependencies != nullptr &&
std::all_of(maps_.cbegin(), maps_.cend(), is_stable)) {
for (const MapRef& map : maps_) {
dependencies->DependOnStableMap(map);
}
SetGuarded();
return true;
} else if (feedback.IsValid()) {
InsertMapChecks(jsgraph, effect, control, feedback);
return true;
} else {
return false;
}
}
Reduction MapInference::NoChange() {
SetGuarded();
maps_.clear(); // Just to make some CHECKs fail if {this} gets used after.
return Reducer::NoChange();
}
} // namespace compiler
} // namespace internal
} // namespace v8
|
