mirrored from https://chromium.googlesource.com/v8/v8.git
/
full-codegen-x87.cc
5347 lines (4528 loc) · 181 KB
/
full-codegen-x87.cc
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
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// Copyright 2012 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/v8.h"
#if V8_TARGET_ARCH_X87
#include "src/code-factory.h"
#include "src/code-stubs.h"
#include "src/codegen.h"
#include "src/compiler.h"
#include "src/debug.h"
#include "src/full-codegen/full-codegen.h"
#include "src/ic/ic.h"
#include "src/parser.h"
#include "src/scopes.h"
namespace v8 {
namespace internal {
#define __ ACCESS_MASM(masm_)
class JumpPatchSite BASE_EMBEDDED {
public:
explicit JumpPatchSite(MacroAssembler* masm) : masm_(masm) {
#ifdef DEBUG
info_emitted_ = false;
#endif
}
~JumpPatchSite() {
DCHECK(patch_site_.is_bound() == info_emitted_);
}
void EmitJumpIfNotSmi(Register reg,
Label* target,
Label::Distance distance = Label::kFar) {
__ test(reg, Immediate(kSmiTagMask));
EmitJump(not_carry, target, distance); // Always taken before patched.
}
void EmitJumpIfSmi(Register reg,
Label* target,
Label::Distance distance = Label::kFar) {
__ test(reg, Immediate(kSmiTagMask));
EmitJump(carry, target, distance); // Never taken before patched.
}
void EmitPatchInfo() {
if (patch_site_.is_bound()) {
int delta_to_patch_site = masm_->SizeOfCodeGeneratedSince(&patch_site_);
DCHECK(is_uint8(delta_to_patch_site));
__ test(eax, Immediate(delta_to_patch_site));
#ifdef DEBUG
info_emitted_ = true;
#endif
} else {
__ nop(); // Signals no inlined code.
}
}
private:
// jc will be patched with jz, jnc will become jnz.
void EmitJump(Condition cc, Label* target, Label::Distance distance) {
DCHECK(!patch_site_.is_bound() && !info_emitted_);
DCHECK(cc == carry || cc == not_carry);
__ bind(&patch_site_);
__ j(cc, target, distance);
}
MacroAssembler* masm_;
Label patch_site_;
#ifdef DEBUG
bool info_emitted_;
#endif
};
// Generate code for a JS function. On entry to the function the receiver
// and arguments have been pushed on the stack left to right, with the
// return address on top of them. The actual argument count matches the
// formal parameter count expected by the function.
//
// The live registers are:
// o edi: the JS function object being called (i.e. ourselves)
// o esi: our context
// o ebp: our caller's frame pointer
// o esp: stack pointer (pointing to return address)
//
// The function builds a JS frame. Please see JavaScriptFrameConstants in
// frames-x87.h for its layout.
void FullCodeGenerator::Generate() {
CompilationInfo* info = info_;
profiling_counter_ = isolate()->factory()->NewCell(
Handle<Smi>(Smi::FromInt(FLAG_interrupt_budget), isolate()));
SetFunctionPosition(function());
Comment cmnt(masm_, "[ function compiled by full code generator");
ProfileEntryHookStub::MaybeCallEntryHook(masm_);
#ifdef DEBUG
if (strlen(FLAG_stop_at) > 0 &&
info->function()->name()->IsUtf8EqualTo(CStrVector(FLAG_stop_at))) {
__ int3();
}
#endif
// Sloppy mode functions and builtins need to replace the receiver with the
// global proxy when called as functions (without an explicit receiver
// object).
if (is_sloppy(info->language_mode()) && !info->is_native() &&
info->MayUseThis()) {
Label ok;
// +1 for return address.
int receiver_offset = (info->scope()->num_parameters() + 1) * kPointerSize;
__ mov(ecx, Operand(esp, receiver_offset));
__ cmp(ecx, isolate()->factory()->undefined_value());
__ j(not_equal, &ok, Label::kNear);
__ mov(ecx, GlobalObjectOperand());
__ mov(ecx, FieldOperand(ecx, GlobalObject::kGlobalProxyOffset));
__ mov(Operand(esp, receiver_offset), ecx);
__ bind(&ok);
}
// Open a frame scope to indicate that there is a frame on the stack. The
// MANUAL indicates that the scope shouldn't actually generate code to set up
// the frame (that is done below).
FrameScope frame_scope(masm_, StackFrame::MANUAL);
info->set_prologue_offset(masm_->pc_offset());
__ Prologue(info->IsCodePreAgingActive());
info->AddNoFrameRange(0, masm_->pc_offset());
{ Comment cmnt(masm_, "[ Allocate locals");
int locals_count = info->scope()->num_stack_slots();
// Generators allocate locals, if any, in context slots.
DCHECK(!IsGeneratorFunction(info->function()->kind()) || locals_count == 0);
if (locals_count == 1) {
__ push(Immediate(isolate()->factory()->undefined_value()));
} else if (locals_count > 1) {
if (locals_count >= 128) {
Label ok;
__ mov(ecx, esp);
__ sub(ecx, Immediate(locals_count * kPointerSize));
ExternalReference stack_limit =
ExternalReference::address_of_real_stack_limit(isolate());
__ cmp(ecx, Operand::StaticVariable(stack_limit));
__ j(above_equal, &ok, Label::kNear);
__ InvokeBuiltin(Builtins::STACK_OVERFLOW, CALL_FUNCTION);
__ bind(&ok);
}
__ mov(eax, Immediate(isolate()->factory()->undefined_value()));
const int kMaxPushes = 32;
if (locals_count >= kMaxPushes) {
int loop_iterations = locals_count / kMaxPushes;
__ mov(ecx, loop_iterations);
Label loop_header;
__ bind(&loop_header);
// Do pushes.
for (int i = 0; i < kMaxPushes; i++) {
__ push(eax);
}
__ dec(ecx);
__ j(not_zero, &loop_header, Label::kNear);
}
int remaining = locals_count % kMaxPushes;
// Emit the remaining pushes.
for (int i = 0; i < remaining; i++) {
__ push(eax);
}
}
}
bool function_in_register = true;
// Possibly allocate a local context.
if (info->scope()->num_heap_slots() > 0) {
Comment cmnt(masm_, "[ Allocate context");
bool need_write_barrier = true;
int slots = info->scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
// Argument to NewContext is the function, which is still in edi.
if (info->scope()->is_script_scope()) {
__ push(edi);
__ Push(info->scope()->GetScopeInfo(info->isolate()));
__ CallRuntime(Runtime::kNewScriptContext, 2);
} else if (slots <= FastNewContextStub::kMaximumSlots) {
FastNewContextStub stub(isolate(), slots);
__ CallStub(&stub);
// Result of FastNewContextStub is always in new space.
need_write_barrier = false;
} else {
__ push(edi);
__ CallRuntime(Runtime::kNewFunctionContext, 1);
}
function_in_register = false;
// Context is returned in eax. It replaces the context passed to us.
// It's saved in the stack and kept live in esi.
__ mov(esi, eax);
__ mov(Operand(ebp, StandardFrameConstants::kContextOffset), eax);
// Copy parameters into context if necessary.
int num_parameters = info->scope()->num_parameters();
int first_parameter = info->scope()->has_this_declaration() ? -1 : 0;
for (int i = first_parameter; i < num_parameters; i++) {
Variable* var = (i == -1) ? scope()->receiver() : scope()->parameter(i);
if (var->IsContextSlot()) {
int parameter_offset = StandardFrameConstants::kCallerSPOffset +
(num_parameters - 1 - i) * kPointerSize;
// Load parameter from stack.
__ mov(eax, Operand(ebp, parameter_offset));
// Store it in the context.
int context_offset = Context::SlotOffset(var->index());
__ mov(Operand(esi, context_offset), eax);
// Update the write barrier. This clobbers eax and ebx.
if (need_write_barrier) {
__ RecordWriteContextSlot(esi, context_offset, eax, ebx,
kDontSaveFPRegs);
} else if (FLAG_debug_code) {
Label done;
__ JumpIfInNewSpace(esi, eax, &done, Label::kNear);
__ Abort(kExpectedNewSpaceObject);
__ bind(&done);
}
}
}
}
// Possibly set up a local binding to the this function which is used in
// derived constructors with super calls.
Variable* this_function_var = scope()->this_function_var();
if (this_function_var != nullptr) {
Comment cmnt(masm_, "[ This function");
if (!function_in_register) {
__ mov(edi, Operand(ebp, JavaScriptFrameConstants::kFunctionOffset));
// The write barrier clobbers register again, keep is marked as such.
}
SetVar(this_function_var, edi, ebx, edx);
}
Variable* new_target_var = scope()->new_target_var();
if (new_target_var != nullptr) {
Comment cmnt(masm_, "[ new.target");
__ mov(eax, Operand(ebp, StandardFrameConstants::kCallerFPOffset));
Label non_adaptor_frame;
__ cmp(Operand(eax, StandardFrameConstants::kContextOffset),
Immediate(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
__ j(not_equal, &non_adaptor_frame);
__ mov(eax, Operand(eax, StandardFrameConstants::kCallerFPOffset));
__ bind(&non_adaptor_frame);
__ cmp(Operand(eax, StandardFrameConstants::kMarkerOffset),
Immediate(Smi::FromInt(StackFrame::CONSTRUCT)));
Label non_construct_frame, done;
__ j(not_equal, &non_construct_frame);
// Construct frame
__ mov(eax,
Operand(eax, ConstructFrameConstants::kOriginalConstructorOffset));
__ jmp(&done);
// Non-construct frame
__ bind(&non_construct_frame);
__ mov(eax, Immediate(isolate()->factory()->undefined_value()));
__ bind(&done);
SetVar(new_target_var, eax, ebx, edx);
}
// Possibly allocate RestParameters
int rest_index;
Variable* rest_param = scope()->rest_parameter(&rest_index);
if (rest_param) {
Comment cmnt(masm_, "[ Allocate rest parameter array");
int num_parameters = info->scope()->num_parameters();
int offset = num_parameters * kPointerSize;
__ lea(edx,
Operand(ebp, StandardFrameConstants::kCallerSPOffset + offset));
__ push(edx);
__ push(Immediate(Smi::FromInt(num_parameters)));
__ push(Immediate(Smi::FromInt(rest_index)));
__ push(Immediate(Smi::FromInt(language_mode())));
RestParamAccessStub stub(isolate());
__ CallStub(&stub);
SetVar(rest_param, eax, ebx, edx);
}
Variable* arguments = scope()->arguments();
if (arguments != NULL) {
// Function uses arguments object.
Comment cmnt(masm_, "[ Allocate arguments object");
if (function_in_register) {
__ push(edi);
} else {
__ push(Operand(ebp, JavaScriptFrameConstants::kFunctionOffset));
}
// Receiver is just before the parameters on the caller's stack.
int num_parameters = info->scope()->num_parameters();
int offset = num_parameters * kPointerSize;
__ lea(edx,
Operand(ebp, StandardFrameConstants::kCallerSPOffset + offset));
__ push(edx);
__ push(Immediate(Smi::FromInt(num_parameters)));
// Arguments to ArgumentsAccessStub:
// function, receiver address, parameter count.
// The stub will rewrite receiver and parameter count if the previous
// stack frame was an arguments adapter frame.
ArgumentsAccessStub::Type type;
if (is_strict(language_mode()) || !is_simple_parameter_list()) {
type = ArgumentsAccessStub::NEW_STRICT;
} else if (function()->has_duplicate_parameters()) {
type = ArgumentsAccessStub::NEW_SLOPPY_SLOW;
} else {
type = ArgumentsAccessStub::NEW_SLOPPY_FAST;
}
ArgumentsAccessStub stub(isolate(), type);
__ CallStub(&stub);
SetVar(arguments, eax, ebx, edx);
}
if (FLAG_trace) {
__ CallRuntime(Runtime::kTraceEnter, 0);
}
// Visit the declarations and body unless there is an illegal
// redeclaration.
if (scope()->HasIllegalRedeclaration()) {
Comment cmnt(masm_, "[ Declarations");
scope()->VisitIllegalRedeclaration(this);
} else {
PrepareForBailoutForId(BailoutId::FunctionEntry(), NO_REGISTERS);
{ Comment cmnt(masm_, "[ Declarations");
VisitDeclarations(scope()->declarations());
}
{ Comment cmnt(masm_, "[ Stack check");
PrepareForBailoutForId(BailoutId::Declarations(), NO_REGISTERS);
Label ok;
ExternalReference stack_limit
= ExternalReference::address_of_stack_limit(isolate());
__ cmp(esp, Operand::StaticVariable(stack_limit));
__ j(above_equal, &ok, Label::kNear);
__ call(isolate()->builtins()->StackCheck(), RelocInfo::CODE_TARGET);
__ bind(&ok);
}
{ Comment cmnt(masm_, "[ Body");
DCHECK(loop_depth() == 0);
VisitStatements(function()->body());
DCHECK(loop_depth() == 0);
}
}
// Always emit a 'return undefined' in case control fell off the end of
// the body.
{ Comment cmnt(masm_, "[ return <undefined>;");
__ mov(eax, isolate()->factory()->undefined_value());
EmitReturnSequence();
}
}
void FullCodeGenerator::ClearAccumulator() {
__ Move(eax, Immediate(Smi::FromInt(0)));
}
void FullCodeGenerator::EmitProfilingCounterDecrement(int delta) {
__ mov(ebx, Immediate(profiling_counter_));
__ sub(FieldOperand(ebx, Cell::kValueOffset),
Immediate(Smi::FromInt(delta)));
}
void FullCodeGenerator::EmitProfilingCounterReset() {
int reset_value = FLAG_interrupt_budget;
__ mov(ebx, Immediate(profiling_counter_));
__ mov(FieldOperand(ebx, Cell::kValueOffset),
Immediate(Smi::FromInt(reset_value)));
}
void FullCodeGenerator::EmitBackEdgeBookkeeping(IterationStatement* stmt,
Label* back_edge_target) {
Comment cmnt(masm_, "[ Back edge bookkeeping");
Label ok;
DCHECK(back_edge_target->is_bound());
int distance = masm_->SizeOfCodeGeneratedSince(back_edge_target);
int weight = Min(kMaxBackEdgeWeight,
Max(1, distance / kCodeSizeMultiplier));
EmitProfilingCounterDecrement(weight);
__ j(positive, &ok, Label::kNear);
__ call(isolate()->builtins()->InterruptCheck(), RelocInfo::CODE_TARGET);
// Record a mapping of this PC offset to the OSR id. This is used to find
// the AST id from the unoptimized code in order to use it as a key into
// the deoptimization input data found in the optimized code.
RecordBackEdge(stmt->OsrEntryId());
EmitProfilingCounterReset();
__ bind(&ok);
PrepareForBailoutForId(stmt->EntryId(), NO_REGISTERS);
// Record a mapping of the OSR id to this PC. This is used if the OSR
// entry becomes the target of a bailout. We don't expect it to be, but
// we want it to work if it is.
PrepareForBailoutForId(stmt->OsrEntryId(), NO_REGISTERS);
}
void FullCodeGenerator::EmitReturnSequence() {
Comment cmnt(masm_, "[ Return sequence");
if (return_label_.is_bound()) {
__ jmp(&return_label_);
} else {
// Common return label
__ bind(&return_label_);
if (FLAG_trace) {
__ push(eax);
__ CallRuntime(Runtime::kTraceExit, 1);
}
// Pretend that the exit is a backwards jump to the entry.
int weight = 1;
if (info_->ShouldSelfOptimize()) {
weight = FLAG_interrupt_budget / FLAG_self_opt_count;
} else {
int distance = masm_->pc_offset();
weight = Min(kMaxBackEdgeWeight,
Max(1, distance / kCodeSizeMultiplier));
}
EmitProfilingCounterDecrement(weight);
Label ok;
__ j(positive, &ok, Label::kNear);
__ push(eax);
__ call(isolate()->builtins()->InterruptCheck(),
RelocInfo::CODE_TARGET);
__ pop(eax);
EmitProfilingCounterReset();
__ bind(&ok);
SetReturnPosition(function());
int no_frame_start = masm_->pc_offset();
__ leave();
int arg_count = info_->scope()->num_parameters() + 1;
int arguments_bytes = arg_count * kPointerSize;
__ Ret(arguments_bytes, ecx);
info_->AddNoFrameRange(no_frame_start, masm_->pc_offset());
}
}
void FullCodeGenerator::StackValueContext::Plug(Variable* var) const {
DCHECK(var->IsStackAllocated() || var->IsContextSlot());
MemOperand operand = codegen()->VarOperand(var, result_register());
// Memory operands can be pushed directly.
__ push(operand);
}
void FullCodeGenerator::EffectContext::Plug(Heap::RootListIndex index) const {
UNREACHABLE(); // Not used on X87.
}
void FullCodeGenerator::AccumulatorValueContext::Plug(
Heap::RootListIndex index) const {
UNREACHABLE(); // Not used on X87.
}
void FullCodeGenerator::StackValueContext::Plug(
Heap::RootListIndex index) const {
UNREACHABLE(); // Not used on X87.
}
void FullCodeGenerator::TestContext::Plug(Heap::RootListIndex index) const {
UNREACHABLE(); // Not used on X87.
}
void FullCodeGenerator::EffectContext::Plug(Handle<Object> lit) const {
}
void FullCodeGenerator::AccumulatorValueContext::Plug(
Handle<Object> lit) const {
if (lit->IsSmi()) {
__ SafeMove(result_register(), Immediate(lit));
} else {
__ Move(result_register(), Immediate(lit));
}
}
void FullCodeGenerator::StackValueContext::Plug(Handle<Object> lit) const {
if (lit->IsSmi()) {
__ SafePush(Immediate(lit));
} else {
__ push(Immediate(lit));
}
}
void FullCodeGenerator::TestContext::Plug(Handle<Object> lit) const {
codegen()->PrepareForBailoutBeforeSplit(condition(),
true,
true_label_,
false_label_);
DCHECK(!lit->IsUndetectableObject()); // There are no undetectable literals.
if (lit->IsUndefined() || lit->IsNull() || lit->IsFalse()) {
if (false_label_ != fall_through_) __ jmp(false_label_);
} else if (lit->IsTrue() || lit->IsJSObject()) {
if (true_label_ != fall_through_) __ jmp(true_label_);
} else if (lit->IsString()) {
if (String::cast(*lit)->length() == 0) {
if (false_label_ != fall_through_) __ jmp(false_label_);
} else {
if (true_label_ != fall_through_) __ jmp(true_label_);
}
} else if (lit->IsSmi()) {
if (Smi::cast(*lit)->value() == 0) {
if (false_label_ != fall_through_) __ jmp(false_label_);
} else {
if (true_label_ != fall_through_) __ jmp(true_label_);
}
} else {
// For simplicity we always test the accumulator register.
__ mov(result_register(), lit);
codegen()->DoTest(this);
}
}
void FullCodeGenerator::EffectContext::DropAndPlug(int count,
Register reg) const {
DCHECK(count > 0);
__ Drop(count);
}
void FullCodeGenerator::AccumulatorValueContext::DropAndPlug(
int count,
Register reg) const {
DCHECK(count > 0);
__ Drop(count);
__ Move(result_register(), reg);
}
void FullCodeGenerator::StackValueContext::DropAndPlug(int count,
Register reg) const {
DCHECK(count > 0);
if (count > 1) __ Drop(count - 1);
__ mov(Operand(esp, 0), reg);
}
void FullCodeGenerator::TestContext::DropAndPlug(int count,
Register reg) const {
DCHECK(count > 0);
// For simplicity we always test the accumulator register.
__ Drop(count);
__ Move(result_register(), reg);
codegen()->PrepareForBailoutBeforeSplit(condition(), false, NULL, NULL);
codegen()->DoTest(this);
}
void FullCodeGenerator::EffectContext::Plug(Label* materialize_true,
Label* materialize_false) const {
DCHECK(materialize_true == materialize_false);
__ bind(materialize_true);
}
void FullCodeGenerator::AccumulatorValueContext::Plug(
Label* materialize_true,
Label* materialize_false) const {
Label done;
__ bind(materialize_true);
__ mov(result_register(), isolate()->factory()->true_value());
__ jmp(&done, Label::kNear);
__ bind(materialize_false);
__ mov(result_register(), isolate()->factory()->false_value());
__ bind(&done);
}
void FullCodeGenerator::StackValueContext::Plug(
Label* materialize_true,
Label* materialize_false) const {
Label done;
__ bind(materialize_true);
__ push(Immediate(isolate()->factory()->true_value()));
__ jmp(&done, Label::kNear);
__ bind(materialize_false);
__ push(Immediate(isolate()->factory()->false_value()));
__ bind(&done);
}
void FullCodeGenerator::TestContext::Plug(Label* materialize_true,
Label* materialize_false) const {
DCHECK(materialize_true == true_label_);
DCHECK(materialize_false == false_label_);
}
void FullCodeGenerator::AccumulatorValueContext::Plug(bool flag) const {
Handle<Object> value = flag
? isolate()->factory()->true_value()
: isolate()->factory()->false_value();
__ mov(result_register(), value);
}
void FullCodeGenerator::StackValueContext::Plug(bool flag) const {
Handle<Object> value = flag
? isolate()->factory()->true_value()
: isolate()->factory()->false_value();
__ push(Immediate(value));
}
void FullCodeGenerator::TestContext::Plug(bool flag) const {
codegen()->PrepareForBailoutBeforeSplit(condition(),
true,
true_label_,
false_label_);
if (flag) {
if (true_label_ != fall_through_) __ jmp(true_label_);
} else {
if (false_label_ != fall_through_) __ jmp(false_label_);
}
}
void FullCodeGenerator::DoTest(Expression* condition,
Label* if_true,
Label* if_false,
Label* fall_through) {
Handle<Code> ic = ToBooleanStub::GetUninitialized(isolate());
CallIC(ic, condition->test_id());
__ test(result_register(), result_register());
// The stub returns nonzero for true.
Split(not_zero, if_true, if_false, fall_through);
}
void FullCodeGenerator::Split(Condition cc,
Label* if_true,
Label* if_false,
Label* fall_through) {
if (if_false == fall_through) {
__ j(cc, if_true);
} else if (if_true == fall_through) {
__ j(NegateCondition(cc), if_false);
} else {
__ j(cc, if_true);
__ jmp(if_false);
}
}
MemOperand FullCodeGenerator::StackOperand(Variable* var) {
DCHECK(var->IsStackAllocated());
// Offset is negative because higher indexes are at lower addresses.
int offset = -var->index() * kPointerSize;
// Adjust by a (parameter or local) base offset.
if (var->IsParameter()) {
offset += (info_->scope()->num_parameters() + 1) * kPointerSize;
} else {
offset += JavaScriptFrameConstants::kLocal0Offset;
}
return Operand(ebp, offset);
}
MemOperand FullCodeGenerator::VarOperand(Variable* var, Register scratch) {
DCHECK(var->IsContextSlot() || var->IsStackAllocated());
if (var->IsContextSlot()) {
int context_chain_length = scope()->ContextChainLength(var->scope());
__ LoadContext(scratch, context_chain_length);
return ContextOperand(scratch, var->index());
} else {
return StackOperand(var);
}
}
void FullCodeGenerator::GetVar(Register dest, Variable* var) {
DCHECK(var->IsContextSlot() || var->IsStackAllocated());
MemOperand location = VarOperand(var, dest);
__ mov(dest, location);
}
void FullCodeGenerator::SetVar(Variable* var,
Register src,
Register scratch0,
Register scratch1) {
DCHECK(var->IsContextSlot() || var->IsStackAllocated());
DCHECK(!scratch0.is(src));
DCHECK(!scratch0.is(scratch1));
DCHECK(!scratch1.is(src));
MemOperand location = VarOperand(var, scratch0);
__ mov(location, src);
// Emit the write barrier code if the location is in the heap.
if (var->IsContextSlot()) {
int offset = Context::SlotOffset(var->index());
DCHECK(!scratch0.is(esi) && !src.is(esi) && !scratch1.is(esi));
__ RecordWriteContextSlot(scratch0, offset, src, scratch1, kDontSaveFPRegs);
}
}
void FullCodeGenerator::PrepareForBailoutBeforeSplit(Expression* expr,
bool should_normalize,
Label* if_true,
Label* if_false) {
// Only prepare for bailouts before splits if we're in a test
// context. Otherwise, we let the Visit function deal with the
// preparation to avoid preparing with the same AST id twice.
if (!context()->IsTest() || !info_->IsOptimizable()) return;
Label skip;
if (should_normalize) __ jmp(&skip, Label::kNear);
PrepareForBailout(expr, TOS_REG);
if (should_normalize) {
__ cmp(eax, isolate()->factory()->true_value());
Split(equal, if_true, if_false, NULL);
__ bind(&skip);
}
}
void FullCodeGenerator::EmitDebugCheckDeclarationContext(Variable* variable) {
// The variable in the declaration always resides in the current context.
DCHECK_EQ(0, scope()->ContextChainLength(variable->scope()));
if (generate_debug_code_) {
// Check that we're not inside a with or catch context.
__ mov(ebx, FieldOperand(esi, HeapObject::kMapOffset));
__ cmp(ebx, isolate()->factory()->with_context_map());
__ Check(not_equal, kDeclarationInWithContext);
__ cmp(ebx, isolate()->factory()->catch_context_map());
__ Check(not_equal, kDeclarationInCatchContext);
}
}
void FullCodeGenerator::VisitVariableDeclaration(
VariableDeclaration* declaration) {
// If it was not possible to allocate the variable at compile time, we
// need to "declare" it at runtime to make sure it actually exists in the
// local context.
VariableProxy* proxy = declaration->proxy();
VariableMode mode = declaration->mode();
Variable* variable = proxy->var();
bool hole_init = mode == LET || mode == CONST || mode == CONST_LEGACY;
switch (variable->location()) {
case VariableLocation::GLOBAL:
case VariableLocation::UNALLOCATED:
globals_->Add(variable->name(), zone());
globals_->Add(variable->binding_needs_init()
? isolate()->factory()->the_hole_value()
: isolate()->factory()->undefined_value(), zone());
break;
case VariableLocation::PARAMETER:
case VariableLocation::LOCAL:
if (hole_init) {
Comment cmnt(masm_, "[ VariableDeclaration");
__ mov(StackOperand(variable),
Immediate(isolate()->factory()->the_hole_value()));
}
break;
case VariableLocation::CONTEXT:
if (hole_init) {
Comment cmnt(masm_, "[ VariableDeclaration");
EmitDebugCheckDeclarationContext(variable);
__ mov(ContextOperand(esi, variable->index()),
Immediate(isolate()->factory()->the_hole_value()));
// No write barrier since the hole value is in old space.
PrepareForBailoutForId(proxy->id(), NO_REGISTERS);
}
break;
case VariableLocation::LOOKUP: {
Comment cmnt(masm_, "[ VariableDeclaration");
__ push(esi);
__ push(Immediate(variable->name()));
// VariableDeclaration nodes are always introduced in one of four modes.
DCHECK(IsDeclaredVariableMode(mode));
PropertyAttributes attr =
IsImmutableVariableMode(mode) ? READ_ONLY : NONE;
__ push(Immediate(Smi::FromInt(attr)));
// Push initial value, if any.
// Note: For variables we must not push an initial value (such as
// 'undefined') because we may have a (legal) redeclaration and we
// must not destroy the current value.
if (hole_init) {
__ push(Immediate(isolate()->factory()->the_hole_value()));
} else {
__ push(Immediate(Smi::FromInt(0))); // Indicates no initial value.
}
__ CallRuntime(Runtime::kDeclareLookupSlot, 4);
break;
}
}
}
void FullCodeGenerator::VisitFunctionDeclaration(
FunctionDeclaration* declaration) {
VariableProxy* proxy = declaration->proxy();
Variable* variable = proxy->var();
switch (variable->location()) {
case VariableLocation::GLOBAL:
case VariableLocation::UNALLOCATED: {
globals_->Add(variable->name(), zone());
Handle<SharedFunctionInfo> function =
Compiler::GetSharedFunctionInfo(declaration->fun(), script(), info_);
// Check for stack-overflow exception.
if (function.is_null()) return SetStackOverflow();
globals_->Add(function, zone());
break;
}
case VariableLocation::PARAMETER:
case VariableLocation::LOCAL: {
Comment cmnt(masm_, "[ FunctionDeclaration");
VisitForAccumulatorValue(declaration->fun());
__ mov(StackOperand(variable), result_register());
break;
}
case VariableLocation::CONTEXT: {
Comment cmnt(masm_, "[ FunctionDeclaration");
EmitDebugCheckDeclarationContext(variable);
VisitForAccumulatorValue(declaration->fun());
__ mov(ContextOperand(esi, variable->index()), result_register());
// We know that we have written a function, which is not a smi.
__ RecordWriteContextSlot(esi, Context::SlotOffset(variable->index()),
result_register(), ecx, kDontSaveFPRegs,
EMIT_REMEMBERED_SET, OMIT_SMI_CHECK);
PrepareForBailoutForId(proxy->id(), NO_REGISTERS);
break;
}
case VariableLocation::LOOKUP: {
Comment cmnt(masm_, "[ FunctionDeclaration");
__ push(esi);
__ push(Immediate(variable->name()));
__ push(Immediate(Smi::FromInt(NONE)));
VisitForStackValue(declaration->fun());
__ CallRuntime(Runtime::kDeclareLookupSlot, 4);
break;
}
}
}
void FullCodeGenerator::DeclareGlobals(Handle<FixedArray> pairs) {
// Call the runtime to declare the globals.
__ push(esi); // The context is the first argument.
__ Push(pairs);
__ Push(Smi::FromInt(DeclareGlobalsFlags()));
__ CallRuntime(Runtime::kDeclareGlobals, 3);
// Return value is ignored.
}
void FullCodeGenerator::DeclareModules(Handle<FixedArray> descriptions) {
// Call the runtime to declare the modules.
__ Push(descriptions);
__ CallRuntime(Runtime::kDeclareModules, 1);
// Return value is ignored.
}
void FullCodeGenerator::VisitSwitchStatement(SwitchStatement* stmt) {
Comment cmnt(masm_, "[ SwitchStatement");
Breakable nested_statement(this, stmt);
SetStatementPosition(stmt);
// Keep the switch value on the stack until a case matches.
VisitForStackValue(stmt->tag());
PrepareForBailoutForId(stmt->EntryId(), NO_REGISTERS);
ZoneList<CaseClause*>* clauses = stmt->cases();
CaseClause* default_clause = NULL; // Can occur anywhere in the list.
Label next_test; // Recycled for each test.
// Compile all the tests with branches to their bodies.
for (int i = 0; i < clauses->length(); i++) {
CaseClause* clause = clauses->at(i);
clause->body_target()->Unuse();
// The default is not a test, but remember it as final fall through.
if (clause->is_default()) {
default_clause = clause;
continue;
}
Comment cmnt(masm_, "[ Case comparison");
__ bind(&next_test);
next_test.Unuse();
// Compile the label expression.
VisitForAccumulatorValue(clause->label());
// Perform the comparison as if via '==='.
__ mov(edx, Operand(esp, 0)); // Switch value.
bool inline_smi_code = ShouldInlineSmiCase(Token::EQ_STRICT);
JumpPatchSite patch_site(masm_);
if (inline_smi_code) {
Label slow_case;
__ mov(ecx, edx);
__ or_(ecx, eax);
patch_site.EmitJumpIfNotSmi(ecx, &slow_case, Label::kNear);
__ cmp(edx, eax);
__ j(not_equal, &next_test);
__ Drop(1); // Switch value is no longer needed.
__ jmp(clause->body_target());
__ bind(&slow_case);
}
SetExpressionPosition(clause);
Handle<Code> ic = CodeFactory::CompareIC(isolate(), Token::EQ_STRICT,
strength(language_mode())).code();
CallIC(ic, clause->CompareId());
patch_site.EmitPatchInfo();
Label skip;
__ jmp(&skip, Label::kNear);
PrepareForBailout(clause, TOS_REG);
__ cmp(eax, isolate()->factory()->true_value());
__ j(not_equal, &next_test);
__ Drop(1);
__ jmp(clause->body_target());
__ bind(&skip);
__ test(eax, eax);
__ j(not_equal, &next_test);
__ Drop(1); // Switch value is no longer needed.
__ jmp(clause->body_target());
}
// Discard the test value and jump to the default if present, otherwise to
// the end of the statement.
__ bind(&next_test);
__ Drop(1); // Switch value is no longer needed.
if (default_clause == NULL) {
__ jmp(nested_statement.break_label());
} else {
__ jmp(default_clause->body_target());
}
// Compile all the case bodies.
for (int i = 0; i < clauses->length(); i++) {
Comment cmnt(masm_, "[ Case body");
CaseClause* clause = clauses->at(i);
__ bind(clause->body_target());
PrepareForBailoutForId(clause->EntryId(), NO_REGISTERS);
VisitStatements(clause->statements());
}
__ bind(nested_statement.break_label());
PrepareForBailoutForId(stmt->ExitId(), NO_REGISTERS);
}
void FullCodeGenerator::VisitForInStatement(ForInStatement* stmt) {
Comment cmnt(masm_, "[ ForInStatement");
SetStatementPosition(stmt, SKIP_BREAK);
FeedbackVectorSlot slot = stmt->ForInFeedbackSlot();
Label loop, exit;
ForIn loop_statement(this, stmt);