Repository navigation
Expand file tree
/
Copy pathJIT.cpp
More file actions
744 lines (636 loc) · 27.8 KB
/
Copy pathJIT.cpp
File metadata and controls
744 lines (636 loc) · 27.8 KB
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
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
/*
* Copyright (C) 2008, 2009, 2012, 2013, 2014 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"
#if ENABLE(JIT)
#include "JIT.h"
// This probably does not belong here; adding here for now as a quick Windows build fix.
#if ENABLE(ASSEMBLER) && CPU(X86) && !OS(MAC_OS_X)
#include "MacroAssembler.h"
JSC::MacroAssemblerX86Common::SSE2CheckState JSC::MacroAssemblerX86Common::s_sse2CheckState = NotCheckedSSE2;
#endif
#include "ArityCheckFailReturnThunks.h"
#include "CodeBlock.h"
#include "DFGCapabilities.h"
#include "Interpreter.h"
#include "JITInlines.h"
#include "JITOperations.h"
#include "JSArray.h"
#include "JSFunction.h"
#include "LinkBuffer.h"
#include "MaxFrameExtentForSlowPathCall.h"
#include "JSCInlines.h"
#include "ProfilerDatabase.h"
#include "RepatchBuffer.h"
#include "ResultType.h"
#include "SamplingTool.h"
#include "SlowPathCall.h"
#include "StackAlignment.h"
#include <wtf/CryptographicallyRandomNumber.h>
using namespace std;
namespace JSC {
void ctiPatchNearCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, MacroAssemblerCodePtr newCalleeFunction)
{
RepatchBuffer repatchBuffer(codeblock);
repatchBuffer.relinkNearCallerToTrampoline(returnAddress, newCalleeFunction);
}
void ctiPatchCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, MacroAssemblerCodePtr newCalleeFunction)
{
RepatchBuffer repatchBuffer(codeblock);
repatchBuffer.relinkCallerToTrampoline(returnAddress, newCalleeFunction);
}
void ctiPatchCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, FunctionPtr newCalleeFunction)
{
RepatchBuffer repatchBuffer(codeblock);
repatchBuffer.relinkCallerToFunction(returnAddress, newCalleeFunction);
}
JIT::JIT(VM* vm, CodeBlock* codeBlock)
: JSInterfaceJIT(vm, codeBlock)
, m_interpreter(vm->interpreter)
, m_labels(codeBlock ? codeBlock->numberOfInstructions() : 0)
, m_bytecodeOffset((unsigned)-1)
, m_getByIdIndex(UINT_MAX)
, m_putByIdIndex(UINT_MAX)
, m_byValInstructionIndex(UINT_MAX)
, m_callLinkInfoIndex(UINT_MAX)
, m_randomGenerator(cryptographicallyRandomNumber())
, m_canBeOptimized(false)
, m_shouldEmitProfiling(false)
{
}
#if ENABLE(DFG_JIT)
void JIT::emitEnterOptimizationCheck()
{
if (!canBeOptimized())
return;
JumpList skipOptimize;
skipOptimize.append(branchAdd32(Signed, TrustedImm32(Options::executionCounterIncrementForEntry()), AbsoluteAddress(m_codeBlock->addressOfJITExecuteCounter())));
ASSERT(!m_bytecodeOffset);
callOperation(operationOptimize, m_bytecodeOffset);
skipOptimize.append(branchTestPtr(Zero, returnValueGPR));
move(returnValueGPR2, stackPointerRegister);
jump(returnValueGPR);
skipOptimize.link(this);
}
#endif
#define NEXT_OPCODE(name) \
m_bytecodeOffset += OPCODE_LENGTH(name); \
break;
#define DEFINE_SLOW_OP(name) \
case op_##name: { \
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_##name); \
slowPathCall.call(); \
NEXT_OPCODE(op_##name); \
}
#define DEFINE_OP(name) \
case name: { \
emit_##name(currentInstruction); \
NEXT_OPCODE(name); \
}
#define DEFINE_SLOWCASE_OP(name) \
case name: { \
emitSlow_##name(currentInstruction, iter); \
NEXT_OPCODE(name); \
}
void JIT::privateCompileMainPass()
{
jitAssertTagsInPlace();
jitAssertArgumentCountSane();
Instruction* instructionsBegin = m_codeBlock->instructions().begin();
unsigned instructionCount = m_codeBlock->instructions().size();
m_callLinkInfoIndex = 0;
for (m_bytecodeOffset = 0; m_bytecodeOffset < instructionCount; ) {
if (m_disassembler)
m_disassembler->setForBytecodeMainPath(m_bytecodeOffset, label());
Instruction* currentInstruction = instructionsBegin + m_bytecodeOffset;
ASSERT_WITH_MESSAGE(m_interpreter->isOpcode(currentInstruction->u.opcode), "privateCompileMainPass gone bad @ %d", m_bytecodeOffset);
#if ENABLE(OPCODE_SAMPLING)
if (m_bytecodeOffset > 0) // Avoid the overhead of sampling op_enter twice.
sampleInstruction(currentInstruction);
#endif
m_labels[m_bytecodeOffset] = label();
#if ENABLE(JIT_VERBOSE)
dataLogF("Old JIT emitting code for bc#%u at offset 0x%lx.\n", m_bytecodeOffset, (long)debugOffset());
#endif
OpcodeID opcodeID = m_interpreter->getOpcodeID(currentInstruction->u.opcode);
if (m_compilation) {
add64(
TrustedImm32(1),
AbsoluteAddress(m_compilation->executionCounterFor(Profiler::OriginStack(Profiler::Origin(
m_compilation->bytecodes(), m_bytecodeOffset)))->address()));
}
if (Options::eagerlyUpdateTopCallFrame())
updateTopCallFrame();
switch (opcodeID) {
DEFINE_SLOW_OP(del_by_val)
DEFINE_SLOW_OP(in)
DEFINE_SLOW_OP(less)
DEFINE_SLOW_OP(lesseq)
DEFINE_SLOW_OP(greater)
DEFINE_SLOW_OP(greatereq)
DEFINE_SLOW_OP(is_function)
DEFINE_SLOW_OP(is_object)
DEFINE_SLOW_OP(typeof)
DEFINE_OP(op_touch_entry)
DEFINE_OP(op_add)
DEFINE_OP(op_bitand)
DEFINE_OP(op_bitor)
DEFINE_OP(op_bitxor)
DEFINE_OP(op_call)
DEFINE_OP(op_call_eval)
DEFINE_OP(op_call_varargs)
DEFINE_OP(op_construct_varargs)
DEFINE_OP(op_catch)
DEFINE_OP(op_construct)
DEFINE_OP(op_get_callee)
DEFINE_OP(op_create_this)
DEFINE_OP(op_to_this)
DEFINE_OP(op_init_lazy_reg)
DEFINE_OP(op_create_arguments)
DEFINE_OP(op_debug)
DEFINE_OP(op_del_by_id)
DEFINE_OP(op_div)
DEFINE_OP(op_end)
DEFINE_OP(op_enter)
DEFINE_OP(op_create_activation)
DEFINE_OP(op_eq)
DEFINE_OP(op_eq_null)
case op_get_by_id_out_of_line:
case op_get_array_length:
DEFINE_OP(op_get_by_id)
DEFINE_OP(op_get_arguments_length)
DEFINE_OP(op_get_by_val)
DEFINE_OP(op_get_argument_by_val)
DEFINE_OP(op_get_by_pname)
DEFINE_OP(op_get_pnames)
DEFINE_OP(op_check_has_instance)
DEFINE_OP(op_instanceof)
DEFINE_OP(op_is_undefined)
DEFINE_OP(op_is_boolean)
DEFINE_OP(op_is_number)
DEFINE_OP(op_is_string)
DEFINE_OP(op_jeq_null)
DEFINE_OP(op_jfalse)
DEFINE_OP(op_jmp)
DEFINE_OP(op_jneq_null)
DEFINE_OP(op_jneq_ptr)
DEFINE_OP(op_jless)
DEFINE_OP(op_jlesseq)
DEFINE_OP(op_jgreater)
DEFINE_OP(op_jgreatereq)
DEFINE_OP(op_jnless)
DEFINE_OP(op_jnlesseq)
DEFINE_OP(op_jngreater)
DEFINE_OP(op_jngreatereq)
DEFINE_OP(op_jtrue)
DEFINE_OP(op_loop_hint)
DEFINE_OP(op_lshift)
DEFINE_OP(op_mod)
DEFINE_OP(op_captured_mov)
DEFINE_OP(op_mov)
DEFINE_OP(op_mul)
DEFINE_OP(op_negate)
DEFINE_OP(op_neq)
DEFINE_OP(op_neq_null)
DEFINE_OP(op_new_array)
DEFINE_OP(op_new_array_with_size)
DEFINE_OP(op_new_array_buffer)
DEFINE_OP(op_new_func)
DEFINE_OP(op_new_captured_func)
DEFINE_OP(op_new_func_exp)
DEFINE_OP(op_new_object)
DEFINE_OP(op_new_regexp)
DEFINE_OP(op_next_pname)
DEFINE_OP(op_not)
DEFINE_OP(op_nstricteq)
DEFINE_OP(op_pop_scope)
DEFINE_OP(op_dec)
DEFINE_OP(op_inc)
DEFINE_OP(op_profile_did_call)
DEFINE_OP(op_profile_will_call)
DEFINE_OP(op_push_name_scope)
DEFINE_OP(op_push_with_scope)
case op_put_by_id_out_of_line:
case op_put_by_id_transition_direct:
case op_put_by_id_transition_normal:
case op_put_by_id_transition_direct_out_of_line:
case op_put_by_id_transition_normal_out_of_line:
DEFINE_OP(op_put_by_id)
DEFINE_OP(op_put_by_index)
case op_put_by_val_direct:
DEFINE_OP(op_put_by_val)
DEFINE_OP(op_put_getter_setter)
case op_init_global_const_nop:
NEXT_OPCODE(op_init_global_const_nop);
DEFINE_OP(op_init_global_const)
DEFINE_OP(op_ret)
DEFINE_OP(op_ret_object_or_this)
DEFINE_OP(op_rshift)
DEFINE_OP(op_unsigned)
DEFINE_OP(op_urshift)
DEFINE_OP(op_strcat)
DEFINE_OP(op_stricteq)
DEFINE_OP(op_sub)
DEFINE_OP(op_switch_char)
DEFINE_OP(op_switch_imm)
DEFINE_OP(op_switch_string)
DEFINE_OP(op_tear_off_activation)
DEFINE_OP(op_tear_off_arguments)
DEFINE_OP(op_throw)
DEFINE_OP(op_throw_static_error)
DEFINE_OP(op_to_number)
DEFINE_OP(op_to_primitive)
DEFINE_OP(op_resolve_scope)
DEFINE_OP(op_get_from_scope)
DEFINE_OP(op_put_to_scope)
default:
RELEASE_ASSERT_NOT_REACHED();
}
}
RELEASE_ASSERT(m_callLinkInfoIndex == m_callCompilationInfo.size());
#ifndef NDEBUG
// Reset this, in order to guard its use with ASSERTs.
m_bytecodeOffset = (unsigned)-1;
#endif
}
void JIT::privateCompileLinkPass()
{
unsigned jmpTableCount = m_jmpTable.size();
for (unsigned i = 0; i < jmpTableCount; ++i)
m_jmpTable[i].from.linkTo(m_labels[m_jmpTable[i].toBytecodeOffset], this);
m_jmpTable.clear();
}
void JIT::privateCompileSlowCases()
{
Instruction* instructionsBegin = m_codeBlock->instructions().begin();
m_getByIdIndex = 0;
m_putByIdIndex = 0;
m_byValInstructionIndex = 0;
m_callLinkInfoIndex = 0;
// Use this to assert that slow-path code associates new profiling sites with existing
// ValueProfiles rather than creating new ones. This ensures that for a given instruction
// (say, get_by_id) we get combined statistics for both the fast-path executions of that
// instructions and the slow-path executions. Furthermore, if the slow-path code created
// new ValueProfiles then the ValueProfiles would no longer be sorted by bytecode offset,
// which would break the invariant necessary to use CodeBlock::valueProfileForBytecodeOffset().
unsigned numberOfValueProfiles = m_codeBlock->numberOfValueProfiles();
for (Vector<SlowCaseEntry>::iterator iter = m_slowCases.begin(); iter != m_slowCases.end();) {
m_bytecodeOffset = iter->to;
unsigned firstTo = m_bytecodeOffset;
Instruction* currentInstruction = instructionsBegin + m_bytecodeOffset;
RareCaseProfile* rareCaseProfile = 0;
if (shouldEmitProfiling())
rareCaseProfile = m_codeBlock->addRareCaseProfile(m_bytecodeOffset);
#if ENABLE(JIT_VERBOSE)
dataLogF("Old JIT emitting slow code for bc#%u at offset 0x%lx.\n", m_bytecodeOffset, (long)debugOffset());
#endif
if (m_disassembler)
m_disassembler->setForBytecodeSlowPath(m_bytecodeOffset, label());
switch (m_interpreter->getOpcodeID(currentInstruction->u.opcode)) {
DEFINE_SLOWCASE_OP(op_add)
DEFINE_SLOWCASE_OP(op_bitand)
DEFINE_SLOWCASE_OP(op_bitor)
DEFINE_SLOWCASE_OP(op_bitxor)
DEFINE_SLOWCASE_OP(op_call)
DEFINE_SLOWCASE_OP(op_call_eval)
DEFINE_SLOWCASE_OP(op_call_varargs)
DEFINE_SLOWCASE_OP(op_construct_varargs)
DEFINE_SLOWCASE_OP(op_construct)
DEFINE_SLOWCASE_OP(op_to_this)
DEFINE_SLOWCASE_OP(op_create_this)
DEFINE_SLOWCASE_OP(op_captured_mov)
DEFINE_SLOWCASE_OP(op_div)
DEFINE_SLOWCASE_OP(op_eq)
DEFINE_SLOWCASE_OP(op_get_callee)
case op_get_by_id_out_of_line:
case op_get_array_length:
DEFINE_SLOWCASE_OP(op_get_by_id)
DEFINE_SLOWCASE_OP(op_get_arguments_length)
DEFINE_SLOWCASE_OP(op_get_by_val)
DEFINE_SLOWCASE_OP(op_get_argument_by_val)
DEFINE_SLOWCASE_OP(op_get_by_pname)
DEFINE_SLOWCASE_OP(op_check_has_instance)
DEFINE_SLOWCASE_OP(op_instanceof)
DEFINE_SLOWCASE_OP(op_jfalse)
DEFINE_SLOWCASE_OP(op_jless)
DEFINE_SLOWCASE_OP(op_jlesseq)
DEFINE_SLOWCASE_OP(op_jgreater)
DEFINE_SLOWCASE_OP(op_jgreatereq)
DEFINE_SLOWCASE_OP(op_jnless)
DEFINE_SLOWCASE_OP(op_jnlesseq)
DEFINE_SLOWCASE_OP(op_jngreater)
DEFINE_SLOWCASE_OP(op_jngreatereq)
DEFINE_SLOWCASE_OP(op_jtrue)
DEFINE_SLOWCASE_OP(op_loop_hint)
DEFINE_SLOWCASE_OP(op_lshift)
DEFINE_SLOWCASE_OP(op_mod)
DEFINE_SLOWCASE_OP(op_mul)
DEFINE_SLOWCASE_OP(op_negate)
DEFINE_SLOWCASE_OP(op_neq)
DEFINE_SLOWCASE_OP(op_new_object)
DEFINE_SLOWCASE_OP(op_not)
DEFINE_SLOWCASE_OP(op_nstricteq)
DEFINE_SLOWCASE_OP(op_dec)
DEFINE_SLOWCASE_OP(op_inc)
case op_put_by_id_out_of_line:
case op_put_by_id_transition_direct:
case op_put_by_id_transition_normal:
case op_put_by_id_transition_direct_out_of_line:
case op_put_by_id_transition_normal_out_of_line:
DEFINE_SLOWCASE_OP(op_put_by_id)
case op_put_by_val_direct:
DEFINE_SLOWCASE_OP(op_put_by_val)
DEFINE_SLOWCASE_OP(op_rshift)
DEFINE_SLOWCASE_OP(op_unsigned)
DEFINE_SLOWCASE_OP(op_urshift)
DEFINE_SLOWCASE_OP(op_stricteq)
DEFINE_SLOWCASE_OP(op_sub)
DEFINE_SLOWCASE_OP(op_to_number)
DEFINE_SLOWCASE_OP(op_to_primitive)
DEFINE_SLOWCASE_OP(op_resolve_scope)
DEFINE_SLOWCASE_OP(op_get_from_scope)
DEFINE_SLOWCASE_OP(op_put_to_scope)
default:
RELEASE_ASSERT_NOT_REACHED();
}
RELEASE_ASSERT_WITH_MESSAGE(iter == m_slowCases.end() || firstTo != iter->to, "Not enough jumps linked in slow case codegen.");
RELEASE_ASSERT_WITH_MESSAGE(firstTo == (iter - 1)->to, "Too many jumps linked in slow case codegen.");
if (shouldEmitProfiling())
add32(TrustedImm32(1), AbsoluteAddress(&rareCaseProfile->m_counter));
emitJumpSlowToHot(jump(), 0);
}
RELEASE_ASSERT(m_getByIdIndex == m_getByIds.size());
RELEASE_ASSERT(m_putByIdIndex == m_putByIds.size());
RELEASE_ASSERT(m_callLinkInfoIndex == m_callCompilationInfo.size());
RELEASE_ASSERT(numberOfValueProfiles == m_codeBlock->numberOfValueProfiles());
#ifndef NDEBUG
// Reset this, in order to guard its use with ASSERTs.
m_bytecodeOffset = (unsigned)-1;
#endif
}
CompilationResult JIT::privateCompile(JITCompilationEffort effort)
{
DFG::CapabilityLevel level = m_codeBlock->capabilityLevel();
switch (level) {
case DFG::CannotCompile:
m_canBeOptimized = false;
m_canBeOptimizedOrInlined = false;
m_shouldEmitProfiling = false;
break;
case DFG::CanInline:
m_canBeOptimized = false;
m_canBeOptimizedOrInlined = true;
m_shouldEmitProfiling = true;
break;
case DFG::CanCompile:
case DFG::CanCompileAndInline:
m_canBeOptimized = true;
m_canBeOptimizedOrInlined = true;
m_shouldEmitProfiling = true;
break;
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
switch (m_codeBlock->codeType()) {
case GlobalCode:
case EvalCode:
m_codeBlock->m_shouldAlwaysBeInlined = false;
break;
case FunctionCode:
// We could have already set it to false because we detected an uninlineable call.
// Don't override that observation.
m_codeBlock->m_shouldAlwaysBeInlined &= canInline(level) && DFG::mightInlineFunction(m_codeBlock);
break;
}
if (Options::showDisassembly() || m_vm->m_perBytecodeProfiler)
m_disassembler = adoptPtr(new JITDisassembler(m_codeBlock));
if (m_vm->m_perBytecodeProfiler) {
m_compilation = adoptRef(
new Profiler::Compilation(
m_vm->m_perBytecodeProfiler->ensureBytecodesFor(m_codeBlock),
Profiler::Baseline));
m_compilation->addProfiledBytecodes(*m_vm->m_perBytecodeProfiler, m_codeBlock);
}
if (m_disassembler)
m_disassembler->setStartOfCode(label());
// Just add a little bit of randomness to the codegen
if (m_randomGenerator.getUint32() & 1)
nop();
emitFunctionPrologue();
emitPutImmediateToCallFrameHeader(m_codeBlock, JSStack::CodeBlock);
Label beginLabel(this);
sampleCodeBlock(m_codeBlock);
#if ENABLE(OPCODE_SAMPLING)
sampleInstruction(m_codeBlock->instructions().begin());
#endif
Jump stackOverflow;
if (m_codeBlock->codeType() == FunctionCode) {
ASSERT(m_bytecodeOffset == (unsigned)-1);
if (shouldEmitProfiling()) {
for (int argument = 0; argument < m_codeBlock->numParameters(); ++argument) {
// If this is a constructor, then we want to put in a dummy profiling site (to
// keep things consistent) but we don't actually want to record the dummy value.
if (m_codeBlock->m_isConstructor && !argument)
continue;
int offset = CallFrame::argumentOffsetIncludingThis(argument) * static_cast<int>(sizeof(Register));
#if USE(JSVALUE64)
load64(Address(callFrameRegister, offset), regT0);
#elif USE(JSVALUE32_64)
load32(Address(callFrameRegister, offset + OBJECT_OFFSETOF(JSValue, u.asBits.payload)), regT0);
load32(Address(callFrameRegister, offset + OBJECT_OFFSETOF(JSValue, u.asBits.tag)), regT1);
#endif
emitValueProfilingSite(m_codeBlock->valueProfileForArgument(argument));
}
}
addPtr(TrustedImm32(stackPointerOffsetFor(m_codeBlock) * sizeof(Register)), callFrameRegister, regT1);
stackOverflow = branchPtr(Above, AbsoluteAddress(m_vm->addressOfStackLimit()), regT1);
}
addPtr(TrustedImm32(stackPointerOffsetFor(m_codeBlock) * sizeof(Register)), callFrameRegister, stackPointerRegister);
checkStackPointerAlignment();
privateCompileMainPass();
privateCompileLinkPass();
privateCompileSlowCases();
if (m_disassembler)
m_disassembler->setEndOfSlowPath(label());
Label arityCheck;
if (m_codeBlock->codeType() == FunctionCode) {
stackOverflow.link(this);
m_bytecodeOffset = 0;
if (maxFrameExtentForSlowPathCall)
addPtr(TrustedImm32(-maxFrameExtentForSlowPathCall), stackPointerRegister);
callOperationWithCallFrameRollbackOnException(operationThrowStackOverflowError, m_codeBlock);
arityCheck = label();
store8(TrustedImm32(0), &m_codeBlock->m_shouldAlwaysBeInlined);
emitFunctionPrologue();
emitPutImmediateToCallFrameHeader(m_codeBlock, JSStack::CodeBlock);
load32(payloadFor(JSStack::ArgumentCount), regT1);
branch32(AboveOrEqual, regT1, TrustedImm32(m_codeBlock->m_numParameters)).linkTo(beginLabel, this);
m_bytecodeOffset = 0;
if (maxFrameExtentForSlowPathCall)
addPtr(TrustedImm32(-maxFrameExtentForSlowPathCall), stackPointerRegister);
callOperationWithCallFrameRollbackOnException(m_codeBlock->m_isConstructor ? operationConstructArityCheck : operationCallArityCheck);
if (maxFrameExtentForSlowPathCall)
addPtr(TrustedImm32(maxFrameExtentForSlowPathCall), stackPointerRegister);
if (returnValueGPR != regT0)
move(returnValueGPR, regT0);
branchTest32(Zero, regT0).linkTo(beginLabel, this);
GPRReg thunkReg;
#if USE(JSVALUE64)
thunkReg = GPRInfo::regT7;
#else
thunkReg = GPRInfo::regT5;
#endif
move(TrustedImmPtr(m_vm->arityCheckFailReturnThunks->returnPCsFor(*m_vm, m_codeBlock->numParameters())), thunkReg);
loadPtr(BaseIndex(thunkReg, regT0, timesPtr()), thunkReg);
emitNakedCall(m_vm->getCTIStub(arityFixup).code());
#if !ASSERT_DISABLED
m_bytecodeOffset = (unsigned)-1; // Reset this, in order to guard its use with ASSERTs.
#endif
jump(beginLabel);
}
ASSERT(m_jmpTable.isEmpty());
privateCompileExceptionHandlers();
if (m_disassembler)
m_disassembler->setEndOfCode(label());
LinkBuffer patchBuffer(*m_vm, *this, m_codeBlock, effort);
if (patchBuffer.didFailToAllocate())
return CompilationFailed;
// Translate vPC offsets into addresses in JIT generated code, for switch tables.
for (unsigned i = 0; i < m_switches.size(); ++i) {
SwitchRecord record = m_switches[i];
unsigned bytecodeOffset = record.bytecodeOffset;
if (record.type != SwitchRecord::String) {
ASSERT(record.type == SwitchRecord::Immediate || record.type == SwitchRecord::Character);
ASSERT(record.jumpTable.simpleJumpTable->branchOffsets.size() == record.jumpTable.simpleJumpTable->ctiOffsets.size());
record.jumpTable.simpleJumpTable->ctiDefault = patchBuffer.locationOf(m_labels[bytecodeOffset + record.defaultOffset]);
for (unsigned j = 0; j < record.jumpTable.simpleJumpTable->branchOffsets.size(); ++j) {
unsigned offset = record.jumpTable.simpleJumpTable->branchOffsets[j];
record.jumpTable.simpleJumpTable->ctiOffsets[j] = offset ? patchBuffer.locationOf(m_labels[bytecodeOffset + offset]) : record.jumpTable.simpleJumpTable->ctiDefault;
}
} else {
ASSERT(record.type == SwitchRecord::String);
record.jumpTable.stringJumpTable->ctiDefault = patchBuffer.locationOf(m_labels[bytecodeOffset + record.defaultOffset]);
StringJumpTable::StringOffsetTable::iterator end = record.jumpTable.stringJumpTable->offsetTable.end();
for (StringJumpTable::StringOffsetTable::iterator it = record.jumpTable.stringJumpTable->offsetTable.begin(); it != end; ++it) {
unsigned offset = it->value.branchOffset;
it->value.ctiOffset = offset ? patchBuffer.locationOf(m_labels[bytecodeOffset + offset]) : record.jumpTable.stringJumpTable->ctiDefault;
}
}
}
for (size_t i = 0; i < m_codeBlock->numberOfExceptionHandlers(); ++i) {
HandlerInfo& handler = m_codeBlock->exceptionHandler(i);
handler.nativeCode = patchBuffer.locationOf(m_labels[handler.target]);
}
for (Vector<CallRecord>::iterator iter = m_calls.begin(); iter != m_calls.end(); ++iter) {
if (iter->to)
patchBuffer.link(iter->from, FunctionPtr(iter->to));
}
for (unsigned i = m_getByIds.size(); i--;)
m_getByIds[i].finalize(patchBuffer);
for (unsigned i = m_putByIds.size(); i--;)
m_putByIds[i].finalize(patchBuffer);
m_codeBlock->setNumberOfByValInfos(m_byValCompilationInfo.size());
for (unsigned i = 0; i < m_byValCompilationInfo.size(); ++i) {
CodeLocationJump badTypeJump = CodeLocationJump(patchBuffer.locationOf(m_byValCompilationInfo[i].badTypeJump));
CodeLocationLabel doneTarget = patchBuffer.locationOf(m_byValCompilationInfo[i].doneTarget);
CodeLocationLabel slowPathTarget = patchBuffer.locationOf(m_byValCompilationInfo[i].slowPathTarget);
CodeLocationCall returnAddress = patchBuffer.locationOf(m_byValCompilationInfo[i].returnAddress);
m_codeBlock->byValInfo(i) = ByValInfo(
m_byValCompilationInfo[i].bytecodeIndex,
badTypeJump,
m_byValCompilationInfo[i].arrayMode,
differenceBetweenCodePtr(badTypeJump, doneTarget),
differenceBetweenCodePtr(returnAddress, slowPathTarget));
}
for (unsigned i = 0; i < m_callCompilationInfo.size(); ++i) {
CallCompilationInfo& compilationInfo = m_callCompilationInfo[i];
CallLinkInfo& info = *compilationInfo.callLinkInfo;
info.callReturnLocation = patchBuffer.locationOfNearCall(compilationInfo.callReturnLocation);
info.hotPathBegin = patchBuffer.locationOf(compilationInfo.hotPathBegin);
info.hotPathOther = patchBuffer.locationOfNearCall(compilationInfo.hotPathOther);
}
CompactJITCodeMap::Encoder jitCodeMapEncoder;
for (unsigned bytecodeOffset = 0; bytecodeOffset < m_labels.size(); ++bytecodeOffset) {
if (m_labels[bytecodeOffset].isSet())
jitCodeMapEncoder.append(bytecodeOffset, patchBuffer.offsetOf(m_labels[bytecodeOffset]));
}
m_codeBlock->setJITCodeMap(jitCodeMapEncoder.finish());
MacroAssemblerCodePtr withArityCheck;
if (m_codeBlock->codeType() == FunctionCode)
withArityCheck = patchBuffer.locationOf(arityCheck);
if (Options::showDisassembly())
m_disassembler->dump(patchBuffer);
if (m_compilation) {
m_disassembler->reportToProfiler(m_compilation.get(), patchBuffer);
m_vm->m_perBytecodeProfiler->addCompilation(m_compilation);
}
CodeRef result = patchBuffer.finalizeCodeWithoutDisassembly();
m_vm->machineCodeBytesPerBytecodeWordForBaselineJIT.add(
static_cast<double>(result.size()) /
static_cast<double>(m_codeBlock->instructions().size()));
m_codeBlock->shrinkToFit(CodeBlock::LateShrink);
m_codeBlock->setJITCode(
adoptRef(new DirectJITCode(result, withArityCheck, JITCode::BaselineJIT)));
#if ENABLE(JIT_VERBOSE)
dataLogF("JIT generated code for %p at [%p, %p).\n", m_codeBlock, result.executableMemory()->start(), result.executableMemory()->end());
#endif
return CompilationSuccessful;
}
void JIT::privateCompileExceptionHandlers()
{
if (m_exceptionChecks.empty() && m_exceptionChecksWithCallFrameRollback.empty())
return;
Jump doLookup;
if (!m_exceptionChecksWithCallFrameRollback.empty()) {
m_exceptionChecksWithCallFrameRollback.link(this);
emitGetCallerFrameFromCallFrameHeaderPtr(GPRInfo::argumentGPR1);
doLookup = jump();
}
if (!m_exceptionChecks.empty())
m_exceptionChecks.link(this);
// lookupExceptionHandler is passed two arguments, the VM and the exec (the CallFrame*).
move(GPRInfo::callFrameRegister, GPRInfo::argumentGPR1);
if (doLookup.isSet())
doLookup.link(this);
move(TrustedImmPtr(vm()), GPRInfo::argumentGPR0);
#if CPU(X86)
// FIXME: should use the call abstraction, but this is currently in the SpeculativeJIT layer!
poke(GPRInfo::argumentGPR0);
poke(GPRInfo::argumentGPR1, 1);
#endif
m_calls.append(CallRecord(call(), (unsigned)-1, FunctionPtr(lookupExceptionHandler).value()));
jumpToExceptionHandler();
}
unsigned JIT::frameRegisterCountFor(CodeBlock* codeBlock)
{
ASSERT(static_cast<unsigned>(codeBlock->m_numCalleeRegisters) == WTF::roundUpToMultipleOf(stackAlignmentRegisters(), static_cast<unsigned>(codeBlock->m_numCalleeRegisters)));
return roundLocalRegisterCountForFramePointerOffset(codeBlock->m_numCalleeRegisters + maxFrameExtentForSlowPathCallInRegisters);
}
int JIT::stackPointerOffsetFor(CodeBlock* codeBlock)
{
return virtualRegisterForLocal(frameRegisterCountFor(codeBlock) - 1).offset();
}
} // namespace JSC
#endif // ENABLE(JIT)