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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
/*
* Copyright (C) 2014, 2015 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "DFGStructureRegistrationPhase.h"
#if ENABLE(DFG_JIT)
#include "DFGBasicBlockInlines.h"
#include "DFGGraph.h"
#include "DFGPhase.h"
#include "JSCInlines.h"
namespace JSC { namespace DFG {
class StructureRegistrationPhase : public Phase {
public:
StructureRegistrationPhase(Graph& graph)
: Phase(graph, "structure registration")
{
}
bool run()
{
// FIXME: This phase shouldn't exist. We should have registered all structures by now, since
// we may already have done optimizations that rely on structures having been registered.
// Currently, we still have places where we don't register structures prior to this phase,
// but structures don't end up being used for optimization prior to this phase. That's a
// pretty fragile situation and we should fix it eventually.
// https://bugs.webkit.org/show_bug.cgi?id=147889
// We need to set this before this phase finishes. This phase doesn't do anything
// conditioned on this field, except for assertIsRegistered() below. We intend for that
// method to behave as if the phase was already finished. So, we set this up here.
m_graph.m_structureRegistrationState = AllStructuresAreRegistered;
// These are pretty dumb, but needed to placate subsequent assertions. We don't actually
// have to watch these because there is no way to transition away from it, but they are
// watchable and so we will assert if they aren't watched.
registerStructure(m_graph.m_vm.structureStructure.get());
registerStructure(m_graph.m_vm.stringStructure.get());
registerStructure(m_graph.m_vm.symbolStructure.get());
registerStructure(m_graph.m_vm.getterSetterStructure.get());
for (FrozenValue* value : m_graph.m_frozenValues)
assertIsRegistered(value->structure());
for (BlockIndex blockIndex = m_graph.numBlocks(); blockIndex--;) {
BasicBlock* block = m_graph.block(blockIndex);
if (!block)
continue;
for (unsigned nodeIndex = 0; nodeIndex < block->size(); ++nodeIndex) {
Node* node = block->at(nodeIndex);
switch (node->op()) {
case CheckStructure:
assertAreRegistered(node->structureSet());
break;
case NewObject:
case ArrayifyToStructure:
case NewStringObject:
registerStructure(node->structure());
break;
case PutStructure:
case AllocatePropertyStorage:
case ReallocatePropertyStorage:
registerStructure(node->transition()->previous);
registerStructure(node->transition()->next);
break;
case MultiGetByOffset:
for (const MultiGetByOffsetCase& getCase : node->multiGetByOffsetData().cases)
registerStructures(getCase.set());
break;
case MultiPutByOffset:
for (unsigned i = node->multiPutByOffsetData().variants.size(); i--;) {
PutByIdVariant& variant = node->multiPutByOffsetData().variants[i];
registerStructures(variant.oldStructure());
if (variant.kind() == PutByIdVariant::Transition)
registerStructure(variant.newStructure());
}
break;
case NewArray:
case NewArrayBuffer:
case NewArrayWithSize: {
JSGlobalObject* globalObject = m_graph.globalObjectFor(node->origin.semantic);
registerStructure(globalObject->arrayStructureForIndexingTypeDuringAllocation(node->indexingType()));
registerStructure(globalObject->originalArrayStructureForIndexingType(ArrayWithSlowPutArrayStorage));
break;
}
case NewTypedArray:
registerStructure(m_graph.globalObjectFor(node->origin.semantic)->typedArrayStructure(node->typedArrayType()));
break;
case ToString:
case CallStringConstructor:
registerStructure(m_graph.globalObjectFor(node->origin.semantic)->stringObjectStructure());
break;
case CreateActivation:
registerStructure(m_graph.globalObjectFor(node->origin.semantic)->activationStructure());
break;
case CreateDirectArguments:
registerStructure(m_graph.globalObjectFor(node->origin.semantic)->directArgumentsStructure());
break;
case CreateScopedArguments:
registerStructure(m_graph.globalObjectFor(node->origin.semantic)->scopedArgumentsStructure());
break;
case NewRegexp:
registerStructure(m_graph.globalObjectFor(node->origin.semantic)->regExpStructure());
break;
case NewArrowFunction:
registerStructure(m_graph.globalObjectFor(node->origin.semantic)->functionStructure());
break;
case NewFunction:
registerStructure(m_graph.globalObjectFor(node->origin.semantic)->functionStructure());
break;
case NewGeneratorFunction:
registerStructure(m_graph.globalObjectFor(node->origin.semantic)->generatorFunctionStructure());
break;
default:
break;
}
}
}
return true;
}
private:
void registerStructures(const StructureSet& set)
{
for (Structure* structure : set)
registerStructure(structure);
}
void registerStructure(Structure* structure)
{
if (structure)
m_graph.registerStructure(structure);
}
void assertAreRegistered(const StructureSet& set)
{
for (Structure* structure : set)
assertIsRegistered(structure);
}
void assertIsRegistered(Structure* structure)
{
if (structure)
m_graph.assertIsRegistered(structure);
}
};
bool performStructureRegistration(Graph& graph)
{
SamplingRegion samplingRegion("DFG Structure Registration Phase");
return runPhase<StructureRegistrationPhase>(graph);
}
} } // namespace JSC::DFG
#endif // ENABLE(DFG_JIT)
|
