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
|
/*
* Copyright (C) 2011, 2012, 2013 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 "DFGDriver.h"
#include "JSObject.h"
#include "JSString.h"
#if ENABLE(DFG_JIT)
#include "DFGArgumentsSimplificationPhase.h"
#include "DFGBackwardsPropagationPhase.h"
#include "DFGByteCodeParser.h"
#include "DFGCFAPhase.h"
#include "DFGCFGSimplificationPhase.h"
#include "DFGCPSRethreadingPhase.h"
#include "DFGCSEPhase.h"
#include "DFGConstantFoldingPhase.h"
#include "DFGDCEPhase.h"
#include "DFGFixupPhase.h"
#include "DFGJITCompiler.h"
#include "DFGPredictionInjectionPhase.h"
#include "DFGPredictionPropagationPhase.h"
#include "DFGTypeCheckHoistingPhase.h"
#include "DFGUnificationPhase.h"
#include "DFGValidate.h"
#include "DFGVirtualRegisterAllocationPhase.h"
#include "Operations.h"
#include "Options.h"
namespace JSC { namespace DFG {
static unsigned numCompilations;
unsigned getNumCompilations()
{
return numCompilations;
}
enum CompileMode { CompileFunction, CompileOther };
inline bool compile(CompileMode compileMode, ExecState* exec, CodeBlock* codeBlock, JITCode& jitCode, MacroAssemblerCodePtr* jitCodeWithArityCheck, unsigned osrEntryBytecodeIndex)
{
SamplingRegion samplingRegion("DFG Compilation (Driver)");
numCompilations++;
ASSERT(codeBlock);
ASSERT(codeBlock->alternative());
ASSERT(codeBlock->alternative()->getJITType() == JITCode::BaselineJIT);
ASSERT(osrEntryBytecodeIndex != UINT_MAX);
if (!Options::useDFGJIT())
return false;
if (!Options::bytecodeRangeToDFGCompile().isInRange(codeBlock->instructionCount()))
return false;
if (logCompilationChanges())
dataLog("DFG compiling ", *codeBlock, ", number of instructions = ", codeBlock->instructionCount(), "\n");
// Derive our set of must-handle values. The compilation must be at least conservative
// enough to allow for OSR entry with these values.
unsigned numVarsWithValues;
if (osrEntryBytecodeIndex)
numVarsWithValues = codeBlock->m_numVars;
else
numVarsWithValues = 0;
Operands<JSValue> mustHandleValues(codeBlock->numParameters(), numVarsWithValues);
for (size_t i = 0; i < mustHandleValues.size(); ++i) {
int operand = mustHandleValues.operandForIndex(i);
if (operandIsArgument(operand)
&& !operandToArgument(operand)
&& compileMode == CompileFunction
&& codeBlock->specializationKind() == CodeForConstruct) {
// Ugh. If we're in a constructor, the 'this' argument may hold garbage. It will
// also never be used. It doesn't matter what we put into the value for this,
// but it has to be an actual value that can be grokked by subsequent DFG passes,
// so we sanitize it here by turning it into Undefined.
mustHandleValues[i] = jsUndefined();
} else
mustHandleValues[i] = exec->uncheckedR(operand).jsValue();
}
Graph dfg(exec->vm(), codeBlock, osrEntryBytecodeIndex, mustHandleValues);
if (!parse(exec, dfg))
return false;
// By this point the DFG bytecode parser will have potentially mutated various tables
// in the CodeBlock. This is a good time to perform an early shrink, which is more
// powerful than a late one. It's safe to do so because we haven't generated any code
// that references any of the tables directly, yet.
codeBlock->shrinkToFit(CodeBlock::EarlyShrink);
if (validationEnabled())
validate(dfg);
performCPSRethreading(dfg);
performUnification(dfg);
performPredictionInjection(dfg);
if (validationEnabled())
validate(dfg);
performBackwardsPropagation(dfg);
performPredictionPropagation(dfg);
performFixup(dfg);
performTypeCheckHoisting(dfg);
dfg.m_fixpointState = FixpointNotConverged;
performCSE(dfg);
performArgumentsSimplification(dfg);
performCPSRethreading(dfg); // This should usually be a no-op since CSE rarely dethreads, and arguments simplification rarely does anything.
performCFA(dfg);
performConstantFolding(dfg);
performCFGSimplification(dfg);
dfg.m_fixpointState = FixpointConverged;
performStoreElimination(dfg);
performCPSRethreading(dfg);
performDCE(dfg);
performVirtualRegisterAllocation(dfg);
GraphDumpMode modeForFinalValidate = DumpGraph;
if (verboseCompilationEnabled()) {
dataLogF("Graph after optimization:\n");
dfg.dump();
modeForFinalValidate = DontDumpGraph;
}
if (validationEnabled())
validate(dfg, modeForFinalValidate);
JITCompiler dataFlowJIT(dfg);
bool result;
if (compileMode == CompileFunction) {
ASSERT(jitCodeWithArityCheck);
result = dataFlowJIT.compileFunction(jitCode, *jitCodeWithArityCheck);
} else {
ASSERT(compileMode == CompileOther);
ASSERT(!jitCodeWithArityCheck);
result = dataFlowJIT.compile(jitCode);
}
return result;
}
bool tryCompile(ExecState* exec, CodeBlock* codeBlock, JITCode& jitCode, unsigned bytecodeIndex)
{
return compile(CompileOther, exec, codeBlock, jitCode, 0, bytecodeIndex);
}
bool tryCompileFunction(ExecState* exec, CodeBlock* codeBlock, JITCode& jitCode, MacroAssemblerCodePtr& jitCodeWithArityCheck, unsigned bytecodeIndex)
{
return compile(CompileFunction, exec, codeBlock, jitCode, &jitCodeWithArityCheck, bytecodeIndex);
}
} } // namespace JSC::DFG
#endif // ENABLE(DFG_JIT)
|
