forked from objcode/v8
-
Notifications
You must be signed in to change notification settings - Fork 0
/
macro-assembler-ia32.cc
1924 lines (1608 loc) · 64.1 KB
/
macro-assembler-ia32.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 2010 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "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 THE COPYRIGHT
// OWNER 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 "v8.h"
#if defined(V8_TARGET_ARCH_IA32)
#include "bootstrapper.h"
#include "codegen-inl.h"
#include "debug.h"
#include "runtime.h"
#include "serialize.h"
namespace v8 {
namespace internal {
// -------------------------------------------------------------------------
// MacroAssembler implementation.
MacroAssembler::MacroAssembler(void* buffer, int size)
: Assembler(buffer, size),
generating_stub_(false),
allow_stub_calls_(true),
code_object_(Heap::undefined_value()) {
}
void MacroAssembler::RecordWriteHelper(Register object,
Register addr,
Register scratch) {
if (FLAG_debug_code) {
// Check that the object is not in new space.
Label not_in_new_space;
InNewSpace(object, scratch, not_equal, ¬_in_new_space);
Abort("new-space object passed to RecordWriteHelper");
bind(¬_in_new_space);
}
// Compute the page start address from the heap object pointer, and reuse
// the 'object' register for it.
and_(object, ~Page::kPageAlignmentMask);
// Compute number of region covering addr. See Page::GetRegionNumberForAddress
// method for more details.
and_(addr, Page::kPageAlignmentMask);
shr(addr, Page::kRegionSizeLog2);
// Set dirty mark for region.
bts(Operand(object, Page::kDirtyFlagOffset), addr);
}
void MacroAssembler::InNewSpace(Register object,
Register scratch,
Condition cc,
Label* branch) {
ASSERT(cc == equal || cc == not_equal);
if (Serializer::enabled()) {
// Can't do arithmetic on external references if it might get serialized.
mov(scratch, Operand(object));
// The mask isn't really an address. We load it as an external reference in
// case the size of the new space is different between the snapshot maker
// and the running system.
and_(Operand(scratch), Immediate(ExternalReference::new_space_mask()));
cmp(Operand(scratch), Immediate(ExternalReference::new_space_start()));
j(cc, branch);
} else {
int32_t new_space_start = reinterpret_cast<int32_t>(
ExternalReference::new_space_start().address());
lea(scratch, Operand(object, -new_space_start));
and_(scratch, Heap::NewSpaceMask());
j(cc, branch);
}
}
void MacroAssembler::RecordWrite(Register object,
int offset,
Register value,
Register scratch) {
// The compiled code assumes that record write doesn't change the
// context register, so we check that none of the clobbered
// registers are esi.
ASSERT(!object.is(esi) && !value.is(esi) && !scratch.is(esi));
// First, check if a write barrier is even needed. The tests below
// catch stores of Smis and stores into young gen.
Label done;
// Skip barrier if writing a smi.
ASSERT_EQ(0, kSmiTag);
test(value, Immediate(kSmiTagMask));
j(zero, &done);
InNewSpace(object, value, equal, &done);
// The offset is relative to a tagged or untagged HeapObject pointer,
// so either offset or offset + kHeapObjectTag must be a
// multiple of kPointerSize.
ASSERT(IsAligned(offset, kPointerSize) ||
IsAligned(offset + kHeapObjectTag, kPointerSize));
Register dst = scratch;
if (offset != 0) {
lea(dst, Operand(object, offset));
} else {
// Array access: calculate the destination address in the same manner as
// KeyedStoreIC::GenerateGeneric. Multiply a smi by 2 to get an offset
// into an array of words.
ASSERT_EQ(1, kSmiTagSize);
ASSERT_EQ(0, kSmiTag);
lea(dst, Operand(object, dst, times_half_pointer_size,
FixedArray::kHeaderSize - kHeapObjectTag));
}
RecordWriteHelper(object, dst, value);
bind(&done);
// Clobber all input registers when running with the debug-code flag
// turned on to provoke errors.
if (FLAG_debug_code) {
mov(object, Immediate(BitCast<int32_t>(kZapValue)));
mov(value, Immediate(BitCast<int32_t>(kZapValue)));
mov(scratch, Immediate(BitCast<int32_t>(kZapValue)));
}
}
void MacroAssembler::RecordWrite(Register object,
Register address,
Register value) {
// The compiled code assumes that record write doesn't change the
// context register, so we check that none of the clobbered
// registers are esi.
ASSERT(!object.is(esi) && !value.is(esi) && !address.is(esi));
// First, check if a write barrier is even needed. The tests below
// catch stores of Smis and stores into young gen.
Label done;
// Skip barrier if writing a smi.
ASSERT_EQ(0, kSmiTag);
test(value, Immediate(kSmiTagMask));
j(zero, &done);
InNewSpace(object, value, equal, &done);
RecordWriteHelper(object, address, value);
bind(&done);
// Clobber all input registers when running with the debug-code flag
// turned on to provoke errors.
if (FLAG_debug_code) {
mov(object, Immediate(BitCast<int32_t>(kZapValue)));
mov(address, Immediate(BitCast<int32_t>(kZapValue)));
mov(value, Immediate(BitCast<int32_t>(kZapValue)));
}
}
#ifdef ENABLE_DEBUGGER_SUPPORT
void MacroAssembler::DebugBreak() {
Set(eax, Immediate(0));
mov(ebx, Immediate(ExternalReference(Runtime::kDebugBreak)));
CEntryStub ces(1);
call(ces.GetCode(), RelocInfo::DEBUG_BREAK);
}
#endif
void MacroAssembler::Set(Register dst, const Immediate& x) {
if (x.is_zero()) {
xor_(dst, Operand(dst)); // shorter than mov
} else {
mov(dst, x);
}
}
void MacroAssembler::Set(const Operand& dst, const Immediate& x) {
mov(dst, x);
}
void MacroAssembler::CmpObjectType(Register heap_object,
InstanceType type,
Register map) {
mov(map, FieldOperand(heap_object, HeapObject::kMapOffset));
CmpInstanceType(map, type);
}
void MacroAssembler::CmpInstanceType(Register map, InstanceType type) {
cmpb(FieldOperand(map, Map::kInstanceTypeOffset),
static_cast<int8_t>(type));
}
void MacroAssembler::CheckMap(Register obj,
Handle<Map> map,
Label* fail,
bool is_heap_object) {
if (!is_heap_object) {
test(obj, Immediate(kSmiTagMask));
j(zero, fail);
}
cmp(FieldOperand(obj, HeapObject::kMapOffset), Immediate(map));
j(not_equal, fail);
}
Condition MacroAssembler::IsObjectStringType(Register heap_object,
Register map,
Register instance_type) {
mov(map, FieldOperand(heap_object, HeapObject::kMapOffset));
movzx_b(instance_type, FieldOperand(map, Map::kInstanceTypeOffset));
ASSERT(kNotStringTag != 0);
test(instance_type, Immediate(kIsNotStringMask));
return zero;
}
void MacroAssembler::IsObjectJSObjectType(Register heap_object,
Register map,
Register scratch,
Label* fail) {
mov(map, FieldOperand(heap_object, HeapObject::kMapOffset));
IsInstanceJSObjectType(map, scratch, fail);
}
void MacroAssembler::IsInstanceJSObjectType(Register map,
Register scratch,
Label* fail) {
movzx_b(scratch, FieldOperand(map, Map::kInstanceTypeOffset));
sub(Operand(scratch), Immediate(FIRST_JS_OBJECT_TYPE));
cmp(scratch, LAST_JS_OBJECT_TYPE - FIRST_JS_OBJECT_TYPE);
j(above, fail);
}
void MacroAssembler::FCmp() {
if (CpuFeatures::IsSupported(CMOV)) {
fucomip();
ffree(0);
fincstp();
} else {
fucompp();
push(eax);
fnstsw_ax();
sahf();
pop(eax);
}
}
void MacroAssembler::AbortIfNotNumber(Register object) {
Label ok;
test(object, Immediate(kSmiTagMask));
j(zero, &ok);
cmp(FieldOperand(object, HeapObject::kMapOffset),
Factory::heap_number_map());
Assert(equal, "Operand not a number");
bind(&ok);
}
void MacroAssembler::AbortIfNotSmi(Register object) {
test(object, Immediate(kSmiTagMask));
Assert(equal, "Operand is not a smi");
}
void MacroAssembler::AbortIfNotString(Register object) {
test(object, Immediate(kSmiTagMask));
Assert(not_equal, "Operand is not a string");
push(object);
mov(object, FieldOperand(object, HeapObject::kMapOffset));
CmpInstanceType(object, FIRST_NONSTRING_TYPE);
pop(object);
Assert(below, "Operand is not a string");
}
void MacroAssembler::AbortIfSmi(Register object) {
test(object, Immediate(kSmiTagMask));
Assert(not_equal, "Operand is a smi");
}
void MacroAssembler::EnterFrame(StackFrame::Type type) {
push(ebp);
mov(ebp, Operand(esp));
push(esi);
push(Immediate(Smi::FromInt(type)));
push(Immediate(CodeObject()));
if (FLAG_debug_code) {
cmp(Operand(esp, 0), Immediate(Factory::undefined_value()));
Check(not_equal, "code object not properly patched");
}
}
void MacroAssembler::LeaveFrame(StackFrame::Type type) {
if (FLAG_debug_code) {
cmp(Operand(ebp, StandardFrameConstants::kMarkerOffset),
Immediate(Smi::FromInt(type)));
Check(equal, "stack frame types must match");
}
leave();
}
void MacroAssembler::EnterExitFramePrologue() {
// Setup the frame structure on the stack.
ASSERT(ExitFrameConstants::kCallerSPDisplacement == +2 * kPointerSize);
ASSERT(ExitFrameConstants::kCallerPCOffset == +1 * kPointerSize);
ASSERT(ExitFrameConstants::kCallerFPOffset == 0 * kPointerSize);
push(ebp);
mov(ebp, Operand(esp));
// Reserve room for entry stack pointer and push the code object.
ASSERT(ExitFrameConstants::kSPOffset == -1 * kPointerSize);
push(Immediate(0)); // Saved entry sp, patched before call.
push(Immediate(CodeObject())); // Accessed from ExitFrame::code_slot.
// Save the frame pointer and the context in top.
ExternalReference c_entry_fp_address(Top::k_c_entry_fp_address);
ExternalReference context_address(Top::k_context_address);
mov(Operand::StaticVariable(c_entry_fp_address), ebp);
mov(Operand::StaticVariable(context_address), esi);
}
void MacroAssembler::EnterExitFrameEpilogue(int argc, bool save_doubles) {
// Optionally save all XMM registers.
if (save_doubles) {
CpuFeatures::Scope scope(SSE2);
int space = XMMRegister::kNumRegisters * kDoubleSize + argc * kPointerSize;
sub(Operand(esp), Immediate(space));
int offset = -2 * kPointerSize;
for (int i = 0; i < XMMRegister::kNumRegisters; i++) {
XMMRegister reg = XMMRegister::from_code(i);
movdbl(Operand(ebp, offset - ((i + 1) * kDoubleSize)), reg);
}
} else {
sub(Operand(esp), Immediate(argc * kPointerSize));
}
// Get the required frame alignment for the OS.
static const int kFrameAlignment = OS::ActivationFrameAlignment();
if (kFrameAlignment > 0) {
ASSERT(IsPowerOf2(kFrameAlignment));
and_(esp, -kFrameAlignment);
}
// Patch the saved entry sp.
mov(Operand(ebp, ExitFrameConstants::kSPOffset), esp);
}
void MacroAssembler::EnterExitFrame(bool save_doubles) {
EnterExitFramePrologue();
// Setup argc and argv in callee-saved registers.
int offset = StandardFrameConstants::kCallerSPOffset - kPointerSize;
mov(edi, Operand(eax));
lea(esi, Operand(ebp, eax, times_4, offset));
EnterExitFrameEpilogue(2, save_doubles);
}
void MacroAssembler::EnterApiExitFrame(int argc) {
EnterExitFramePrologue();
EnterExitFrameEpilogue(argc, false);
}
void MacroAssembler::LeaveExitFrame(bool save_doubles) {
// Optionally restore all XMM registers.
if (save_doubles) {
CpuFeatures::Scope scope(SSE2);
int offset = -2 * kPointerSize;
for (int i = 0; i < XMMRegister::kNumRegisters; i++) {
XMMRegister reg = XMMRegister::from_code(i);
movdbl(reg, Operand(ebp, offset - ((i + 1) * kDoubleSize)));
}
}
// Get the return address from the stack and restore the frame pointer.
mov(ecx, Operand(ebp, 1 * kPointerSize));
mov(ebp, Operand(ebp, 0 * kPointerSize));
// Pop the arguments and the receiver from the caller stack.
lea(esp, Operand(esi, 1 * kPointerSize));
// Push the return address to get ready to return.
push(ecx);
LeaveExitFrameEpilogue();
}
void MacroAssembler::LeaveExitFrameEpilogue() {
// Restore current context from top and clear it in debug mode.
ExternalReference context_address(Top::k_context_address);
mov(esi, Operand::StaticVariable(context_address));
#ifdef DEBUG
mov(Operand::StaticVariable(context_address), Immediate(0));
#endif
// Clear the top frame.
ExternalReference c_entry_fp_address(Top::k_c_entry_fp_address);
mov(Operand::StaticVariable(c_entry_fp_address), Immediate(0));
}
void MacroAssembler::LeaveApiExitFrame() {
mov(esp, Operand(ebp));
pop(ebp);
LeaveExitFrameEpilogue();
}
void MacroAssembler::PushTryHandler(CodeLocation try_location,
HandlerType type) {
// Adjust this code if not the case.
ASSERT(StackHandlerConstants::kSize == 4 * kPointerSize);
// The pc (return address) is already on TOS.
if (try_location == IN_JAVASCRIPT) {
if (type == TRY_CATCH_HANDLER) {
push(Immediate(StackHandler::TRY_CATCH));
} else {
push(Immediate(StackHandler::TRY_FINALLY));
}
push(ebp);
} else {
ASSERT(try_location == IN_JS_ENTRY);
// The frame pointer does not point to a JS frame so we save NULL
// for ebp. We expect the code throwing an exception to check ebp
// before dereferencing it to restore the context.
push(Immediate(StackHandler::ENTRY));
push(Immediate(0)); // NULL frame pointer.
}
// Save the current handler as the next handler.
push(Operand::StaticVariable(ExternalReference(Top::k_handler_address)));
// Link this handler as the new current one.
mov(Operand::StaticVariable(ExternalReference(Top::k_handler_address)), esp);
}
void MacroAssembler::PopTryHandler() {
ASSERT_EQ(0, StackHandlerConstants::kNextOffset);
pop(Operand::StaticVariable(ExternalReference(Top::k_handler_address)));
add(Operand(esp), Immediate(StackHandlerConstants::kSize - kPointerSize));
}
void MacroAssembler::CheckAccessGlobalProxy(Register holder_reg,
Register scratch,
Label* miss) {
Label same_contexts;
ASSERT(!holder_reg.is(scratch));
// Load current lexical context from the stack frame.
mov(scratch, Operand(ebp, StandardFrameConstants::kContextOffset));
// When generating debug code, make sure the lexical context is set.
if (FLAG_debug_code) {
cmp(Operand(scratch), Immediate(0));
Check(not_equal, "we should not have an empty lexical context");
}
// Load the global context of the current context.
int offset = Context::kHeaderSize + Context::GLOBAL_INDEX * kPointerSize;
mov(scratch, FieldOperand(scratch, offset));
mov(scratch, FieldOperand(scratch, GlobalObject::kGlobalContextOffset));
// Check the context is a global context.
if (FLAG_debug_code) {
push(scratch);
// Read the first word and compare to global_context_map.
mov(scratch, FieldOperand(scratch, HeapObject::kMapOffset));
cmp(scratch, Factory::global_context_map());
Check(equal, "JSGlobalObject::global_context should be a global context.");
pop(scratch);
}
// Check if both contexts are the same.
cmp(scratch, FieldOperand(holder_reg, JSGlobalProxy::kContextOffset));
j(equal, &same_contexts, taken);
// Compare security tokens, save holder_reg on the stack so we can use it
// as a temporary register.
//
// TODO(119): avoid push(holder_reg)/pop(holder_reg)
push(holder_reg);
// Check that the security token in the calling global object is
// compatible with the security token in the receiving global
// object.
mov(holder_reg, FieldOperand(holder_reg, JSGlobalProxy::kContextOffset));
// Check the context is a global context.
if (FLAG_debug_code) {
cmp(holder_reg, Factory::null_value());
Check(not_equal, "JSGlobalProxy::context() should not be null.");
push(holder_reg);
// Read the first word and compare to global_context_map(),
mov(holder_reg, FieldOperand(holder_reg, HeapObject::kMapOffset));
cmp(holder_reg, Factory::global_context_map());
Check(equal, "JSGlobalObject::global_context should be a global context.");
pop(holder_reg);
}
int token_offset = Context::kHeaderSize +
Context::SECURITY_TOKEN_INDEX * kPointerSize;
mov(scratch, FieldOperand(scratch, token_offset));
cmp(scratch, FieldOperand(holder_reg, token_offset));
pop(holder_reg);
j(not_equal, miss, not_taken);
bind(&same_contexts);
}
void MacroAssembler::LoadAllocationTopHelper(Register result,
Register scratch,
AllocationFlags flags) {
ExternalReference new_space_allocation_top =
ExternalReference::new_space_allocation_top_address();
// Just return if allocation top is already known.
if ((flags & RESULT_CONTAINS_TOP) != 0) {
// No use of scratch if allocation top is provided.
ASSERT(scratch.is(no_reg));
#ifdef DEBUG
// Assert that result actually contains top on entry.
cmp(result, Operand::StaticVariable(new_space_allocation_top));
Check(equal, "Unexpected allocation top");
#endif
return;
}
// Move address of new object to result. Use scratch register if available.
if (scratch.is(no_reg)) {
mov(result, Operand::StaticVariable(new_space_allocation_top));
} else {
mov(Operand(scratch), Immediate(new_space_allocation_top));
mov(result, Operand(scratch, 0));
}
}
void MacroAssembler::UpdateAllocationTopHelper(Register result_end,
Register scratch) {
if (FLAG_debug_code) {
test(result_end, Immediate(kObjectAlignmentMask));
Check(zero, "Unaligned allocation in new space");
}
ExternalReference new_space_allocation_top =
ExternalReference::new_space_allocation_top_address();
// Update new top. Use scratch if available.
if (scratch.is(no_reg)) {
mov(Operand::StaticVariable(new_space_allocation_top), result_end);
} else {
mov(Operand(scratch, 0), result_end);
}
}
void MacroAssembler::AllocateInNewSpace(int object_size,
Register result,
Register result_end,
Register scratch,
Label* gc_required,
AllocationFlags flags) {
if (!FLAG_inline_new) {
if (FLAG_debug_code) {
// Trash the registers to simulate an allocation failure.
mov(result, Immediate(0x7091));
if (result_end.is_valid()) {
mov(result_end, Immediate(0x7191));
}
if (scratch.is_valid()) {
mov(scratch, Immediate(0x7291));
}
}
jmp(gc_required);
return;
}
ASSERT(!result.is(result_end));
// Load address of new object into result.
LoadAllocationTopHelper(result, scratch, flags);
Register top_reg = result_end.is_valid() ? result_end : result;
// Calculate new top and bail out if new space is exhausted.
ExternalReference new_space_allocation_limit =
ExternalReference::new_space_allocation_limit_address();
if (top_reg.is(result)) {
add(Operand(top_reg), Immediate(object_size));
} else {
lea(top_reg, Operand(result, object_size));
}
cmp(top_reg, Operand::StaticVariable(new_space_allocation_limit));
j(above, gc_required, not_taken);
// Update allocation top.
UpdateAllocationTopHelper(top_reg, scratch);
// Tag result if requested.
if (top_reg.is(result)) {
if ((flags & TAG_OBJECT) != 0) {
sub(Operand(result), Immediate(object_size - kHeapObjectTag));
} else {
sub(Operand(result), Immediate(object_size));
}
} else if ((flags & TAG_OBJECT) != 0) {
add(Operand(result), Immediate(kHeapObjectTag));
}
}
void MacroAssembler::AllocateInNewSpace(int header_size,
ScaleFactor element_size,
Register element_count,
Register result,
Register result_end,
Register scratch,
Label* gc_required,
AllocationFlags flags) {
if (!FLAG_inline_new) {
if (FLAG_debug_code) {
// Trash the registers to simulate an allocation failure.
mov(result, Immediate(0x7091));
mov(result_end, Immediate(0x7191));
if (scratch.is_valid()) {
mov(scratch, Immediate(0x7291));
}
// Register element_count is not modified by the function.
}
jmp(gc_required);
return;
}
ASSERT(!result.is(result_end));
// Load address of new object into result.
LoadAllocationTopHelper(result, scratch, flags);
// Calculate new top and bail out if new space is exhausted.
ExternalReference new_space_allocation_limit =
ExternalReference::new_space_allocation_limit_address();
lea(result_end, Operand(result, element_count, element_size, header_size));
cmp(result_end, Operand::StaticVariable(new_space_allocation_limit));
j(above, gc_required);
// Tag result if requested.
if ((flags & TAG_OBJECT) != 0) {
lea(result, Operand(result, kHeapObjectTag));
}
// Update allocation top.
UpdateAllocationTopHelper(result_end, scratch);
}
void MacroAssembler::AllocateInNewSpace(Register object_size,
Register result,
Register result_end,
Register scratch,
Label* gc_required,
AllocationFlags flags) {
if (!FLAG_inline_new) {
if (FLAG_debug_code) {
// Trash the registers to simulate an allocation failure.
mov(result, Immediate(0x7091));
mov(result_end, Immediate(0x7191));
if (scratch.is_valid()) {
mov(scratch, Immediate(0x7291));
}
// object_size is left unchanged by this function.
}
jmp(gc_required);
return;
}
ASSERT(!result.is(result_end));
// Load address of new object into result.
LoadAllocationTopHelper(result, scratch, flags);
// Calculate new top and bail out if new space is exhausted.
ExternalReference new_space_allocation_limit =
ExternalReference::new_space_allocation_limit_address();
if (!object_size.is(result_end)) {
mov(result_end, object_size);
}
add(result_end, Operand(result));
cmp(result_end, Operand::StaticVariable(new_space_allocation_limit));
j(above, gc_required, not_taken);
// Tag result if requested.
if ((flags & TAG_OBJECT) != 0) {
lea(result, Operand(result, kHeapObjectTag));
}
// Update allocation top.
UpdateAllocationTopHelper(result_end, scratch);
}
void MacroAssembler::UndoAllocationInNewSpace(Register object) {
ExternalReference new_space_allocation_top =
ExternalReference::new_space_allocation_top_address();
// Make sure the object has no tag before resetting top.
and_(Operand(object), Immediate(~kHeapObjectTagMask));
#ifdef DEBUG
cmp(object, Operand::StaticVariable(new_space_allocation_top));
Check(below, "Undo allocation of non allocated memory");
#endif
mov(Operand::StaticVariable(new_space_allocation_top), object);
}
void MacroAssembler::AllocateHeapNumber(Register result,
Register scratch1,
Register scratch2,
Label* gc_required) {
// Allocate heap number in new space.
AllocateInNewSpace(HeapNumber::kSize,
result,
scratch1,
scratch2,
gc_required,
TAG_OBJECT);
// Set the map.
mov(FieldOperand(result, HeapObject::kMapOffset),
Immediate(Factory::heap_number_map()));
}
void MacroAssembler::AllocateTwoByteString(Register result,
Register length,
Register scratch1,
Register scratch2,
Register scratch3,
Label* gc_required) {
// Calculate the number of bytes needed for the characters in the string while
// observing object alignment.
ASSERT((SeqTwoByteString::kHeaderSize & kObjectAlignmentMask) == 0);
ASSERT(kShortSize == 2);
// scratch1 = length * 2 + kObjectAlignmentMask.
lea(scratch1, Operand(length, length, times_1, kObjectAlignmentMask));
and_(Operand(scratch1), Immediate(~kObjectAlignmentMask));
// Allocate two byte string in new space.
AllocateInNewSpace(SeqTwoByteString::kHeaderSize,
times_1,
scratch1,
result,
scratch2,
scratch3,
gc_required,
TAG_OBJECT);
// Set the map, length and hash field.
mov(FieldOperand(result, HeapObject::kMapOffset),
Immediate(Factory::string_map()));
mov(scratch1, length);
SmiTag(scratch1);
mov(FieldOperand(result, String::kLengthOffset), scratch1);
mov(FieldOperand(result, String::kHashFieldOffset),
Immediate(String::kEmptyHashField));
}
void MacroAssembler::AllocateAsciiString(Register result,
Register length,
Register scratch1,
Register scratch2,
Register scratch3,
Label* gc_required) {
// Calculate the number of bytes needed for the characters in the string while
// observing object alignment.
ASSERT((SeqAsciiString::kHeaderSize & kObjectAlignmentMask) == 0);
mov(scratch1, length);
ASSERT(kCharSize == 1);
add(Operand(scratch1), Immediate(kObjectAlignmentMask));
and_(Operand(scratch1), Immediate(~kObjectAlignmentMask));
// Allocate ascii string in new space.
AllocateInNewSpace(SeqAsciiString::kHeaderSize,
times_1,
scratch1,
result,
scratch2,
scratch3,
gc_required,
TAG_OBJECT);
// Set the map, length and hash field.
mov(FieldOperand(result, HeapObject::kMapOffset),
Immediate(Factory::ascii_string_map()));
mov(scratch1, length);
SmiTag(scratch1);
mov(FieldOperand(result, String::kLengthOffset), scratch1);
mov(FieldOperand(result, String::kHashFieldOffset),
Immediate(String::kEmptyHashField));
}
void MacroAssembler::AllocateAsciiString(Register result,
int length,
Register scratch1,
Register scratch2,
Label* gc_required) {
ASSERT(length > 0);
// Allocate ascii string in new space.
AllocateInNewSpace(SeqAsciiString::SizeFor(length),
result,
scratch1,
scratch2,
gc_required,
TAG_OBJECT);
// Set the map, length and hash field.
mov(FieldOperand(result, HeapObject::kMapOffset),
Immediate(Factory::ascii_string_map()));
mov(FieldOperand(result, String::kLengthOffset),
Immediate(Smi::FromInt(length)));
mov(FieldOperand(result, String::kHashFieldOffset),
Immediate(String::kEmptyHashField));
}
void MacroAssembler::AllocateConsString(Register result,
Register scratch1,
Register scratch2,
Label* gc_required) {
// Allocate heap number in new space.
AllocateInNewSpace(ConsString::kSize,
result,
scratch1,
scratch2,
gc_required,
TAG_OBJECT);
// Set the map. The other fields are left uninitialized.
mov(FieldOperand(result, HeapObject::kMapOffset),
Immediate(Factory::cons_string_map()));
}
void MacroAssembler::AllocateAsciiConsString(Register result,
Register scratch1,
Register scratch2,
Label* gc_required) {
// Allocate heap number in new space.
AllocateInNewSpace(ConsString::kSize,
result,
scratch1,
scratch2,
gc_required,
TAG_OBJECT);
// Set the map. The other fields are left uninitialized.
mov(FieldOperand(result, HeapObject::kMapOffset),
Immediate(Factory::cons_ascii_string_map()));
}
// All registers must be distinct. Only current_string needs valid contents
// on entry. All registers may be invalid on exit. result_operand is
// unchanged, padding_chars is updated correctly.
void MacroAssembler::AppendStringToTopOfNewSpace(
Register current_string, // Tagged pointer to string to copy.
Register current_string_length,
Register result_pos,
Register scratch,
Register new_padding_chars,
Operand operand_result,
Operand operand_padding_chars,
Label* bailout) {
mov(current_string_length,
FieldOperand(current_string, String::kLengthOffset));
shr(current_string_length, 1);
sub(current_string_length, operand_padding_chars);
mov(new_padding_chars, current_string_length);
add(Operand(current_string_length), Immediate(kObjectAlignmentMask));
and_(Operand(current_string_length), Immediate(~kObjectAlignmentMask));
sub(new_padding_chars, Operand(current_string_length));
neg(new_padding_chars);
// We need an allocation even if current_string_length is 0, to fetch
// result_pos. Consider using a faster fetch of result_pos in that case.
AllocateInNewSpace(current_string_length, result_pos, scratch, no_reg,
bailout, NO_ALLOCATION_FLAGS);
sub(result_pos, operand_padding_chars);
mov(operand_padding_chars, new_padding_chars);
Register scratch_2 = new_padding_chars; // Used to compute total length.
// Copy string to the end of result.
mov(current_string_length,
FieldOperand(current_string, String::kLengthOffset));
mov(scratch, operand_result);
mov(scratch_2, current_string_length);
add(scratch_2, FieldOperand(scratch, String::kLengthOffset));
mov(FieldOperand(scratch, String::kLengthOffset), scratch_2);
shr(current_string_length, 1);
lea(current_string,
FieldOperand(current_string, SeqAsciiString::kHeaderSize));
// Loop condition: while (--current_string_length >= 0).
Label copy_loop;
Label copy_loop_entry;
jmp(©_loop_entry);
bind(©_loop);
mov_b(scratch, Operand(current_string, current_string_length, times_1, 0));
mov_b(Operand(result_pos, current_string_length, times_1, 0), scratch);
bind(©_loop_entry);
sub(Operand(current_string_length), Immediate(1));
j(greater_equal, ©_loop);
}
void MacroAssembler::NegativeZeroTest(CodeGenerator* cgen,
Register result,
Register op,
JumpTarget* then_target) {
JumpTarget ok;
test(result, Operand(result));
ok.Branch(not_zero, taken);
test(op, Operand(op));
then_target->Branch(sign, not_taken);
ok.Bind();
}
void MacroAssembler::NegativeZeroTest(Register result,
Register op,
Label* then_label) {
Label ok;
test(result, Operand(result));
j(not_zero, &ok, taken);
test(op, Operand(op));
j(sign, then_label, not_taken);
bind(&ok);
}
void MacroAssembler::NegativeZeroTest(Register result,
Register op1,
Register op2,
Register scratch,
Label* then_label) {
Label ok;
test(result, Operand(result));
j(not_zero, &ok, taken);
mov(scratch, Operand(op1));
or_(scratch, Operand(op2));
j(sign, then_label, not_taken);
bind(&ok);
}
void MacroAssembler::TryGetFunctionPrototype(Register function,
Register result,
Register scratch,
Label* miss) {
// Check that the receiver isn't a smi.