1// Copyright 2012 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "src/v8.h"
6
7#if V8_TARGET_ARCH_MIPS
8
9#include "src/hydrogen-osr.h"
10#include "src/lithium-inl.h"
11#include "src/mips/lithium-codegen-mips.h"
12
13namespace v8 {
14namespace internal {
15
16#define DEFINE_COMPILE(type)                            \
17  void L##type::CompileToNative(LCodeGen* generator) {  \
18    generator->Do##type(this);                          \
19  }
20LITHIUM_CONCRETE_INSTRUCTION_LIST(DEFINE_COMPILE)
21#undef DEFINE_COMPILE
22
23#ifdef DEBUG
24void LInstruction::VerifyCall() {
25  // Call instructions can use only fixed registers as temporaries and
26  // outputs because all registers are blocked by the calling convention.
27  // Inputs operands must use a fixed register or use-at-start policy or
28  // a non-register policy.
29  DCHECK(Output() == NULL ||
30         LUnallocated::cast(Output())->HasFixedPolicy() ||
31         !LUnallocated::cast(Output())->HasRegisterPolicy());
32  for (UseIterator it(this); !it.Done(); it.Advance()) {
33    LUnallocated* operand = LUnallocated::cast(it.Current());
34    DCHECK(operand->HasFixedPolicy() ||
35           operand->IsUsedAtStart());
36  }
37  for (TempIterator it(this); !it.Done(); it.Advance()) {
38    LUnallocated* operand = LUnallocated::cast(it.Current());
39    DCHECK(operand->HasFixedPolicy() ||!operand->HasRegisterPolicy());
40  }
41}
42#endif
43
44
45void LInstruction::PrintTo(StringStream* stream) {
46  stream->Add("%s ", this->Mnemonic());
47
48  PrintOutputOperandTo(stream);
49
50  PrintDataTo(stream);
51
52  if (HasEnvironment()) {
53    stream->Add(" ");
54    environment()->PrintTo(stream);
55  }
56
57  if (HasPointerMap()) {
58    stream->Add(" ");
59    pointer_map()->PrintTo(stream);
60  }
61}
62
63
64void LInstruction::PrintDataTo(StringStream* stream) {
65  stream->Add("= ");
66  for (int i = 0; i < InputCount(); i++) {
67    if (i > 0) stream->Add(" ");
68    if (InputAt(i) == NULL) {
69      stream->Add("NULL");
70    } else {
71      InputAt(i)->PrintTo(stream);
72    }
73  }
74}
75
76
77void LInstruction::PrintOutputOperandTo(StringStream* stream) {
78  if (HasResult()) result()->PrintTo(stream);
79}
80
81
82void LLabel::PrintDataTo(StringStream* stream) {
83  LGap::PrintDataTo(stream);
84  LLabel* rep = replacement();
85  if (rep != NULL) {
86    stream->Add(" Dead block replaced with B%d", rep->block_id());
87  }
88}
89
90
91bool LGap::IsRedundant() const {
92  for (int i = 0; i < 4; i++) {
93    if (parallel_moves_[i] != NULL && !parallel_moves_[i]->IsRedundant()) {
94      return false;
95    }
96  }
97
98  return true;
99}
100
101
102void LGap::PrintDataTo(StringStream* stream) {
103  for (int i = 0; i < 4; i++) {
104    stream->Add("(");
105    if (parallel_moves_[i] != NULL) {
106      parallel_moves_[i]->PrintDataTo(stream);
107    }
108    stream->Add(") ");
109  }
110}
111
112
113const char* LArithmeticD::Mnemonic() const {
114  switch (op()) {
115    case Token::ADD: return "add-d";
116    case Token::SUB: return "sub-d";
117    case Token::MUL: return "mul-d";
118    case Token::DIV: return "div-d";
119    case Token::MOD: return "mod-d";
120    default:
121      UNREACHABLE();
122      return NULL;
123  }
124}
125
126
127const char* LArithmeticT::Mnemonic() const {
128  switch (op()) {
129    case Token::ADD: return "add-t";
130    case Token::SUB: return "sub-t";
131    case Token::MUL: return "mul-t";
132    case Token::MOD: return "mod-t";
133    case Token::DIV: return "div-t";
134    case Token::BIT_AND: return "bit-and-t";
135    case Token::BIT_OR: return "bit-or-t";
136    case Token::BIT_XOR: return "bit-xor-t";
137    case Token::ROR: return "ror-t";
138    case Token::SHL: return "sll-t";
139    case Token::SAR: return "sra-t";
140    case Token::SHR: return "srl-t";
141    default:
142      UNREACHABLE();
143      return NULL;
144  }
145}
146
147
148bool LGoto::HasInterestingComment(LCodeGen* gen) const {
149  return !gen->IsNextEmittedBlock(block_id());
150}
151
152
153void LGoto::PrintDataTo(StringStream* stream) {
154  stream->Add("B%d", block_id());
155}
156
157
158void LBranch::PrintDataTo(StringStream* stream) {
159  stream->Add("B%d | B%d on ", true_block_id(), false_block_id());
160  value()->PrintTo(stream);
161}
162
163
164LInstruction* LChunkBuilder::DoDebugBreak(HDebugBreak* instr) {
165  return new(zone()) LDebugBreak();
166}
167
168
169void LCompareNumericAndBranch::PrintDataTo(StringStream* stream) {
170  stream->Add("if ");
171  left()->PrintTo(stream);
172  stream->Add(" %s ", Token::String(op()));
173  right()->PrintTo(stream);
174  stream->Add(" then B%d else B%d", true_block_id(), false_block_id());
175}
176
177
178void LIsObjectAndBranch::PrintDataTo(StringStream* stream) {
179  stream->Add("if is_object(");
180  value()->PrintTo(stream);
181  stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
182}
183
184
185void LIsStringAndBranch::PrintDataTo(StringStream* stream) {
186  stream->Add("if is_string(");
187  value()->PrintTo(stream);
188  stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
189}
190
191
192void LIsSmiAndBranch::PrintDataTo(StringStream* stream) {
193  stream->Add("if is_smi(");
194  value()->PrintTo(stream);
195  stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
196}
197
198
199void LIsUndetectableAndBranch::PrintDataTo(StringStream* stream) {
200  stream->Add("if is_undetectable(");
201  value()->PrintTo(stream);
202  stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
203}
204
205
206void LStringCompareAndBranch::PrintDataTo(StringStream* stream) {
207  stream->Add("if string_compare(");
208  left()->PrintTo(stream);
209  right()->PrintTo(stream);
210  stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
211}
212
213
214void LHasInstanceTypeAndBranch::PrintDataTo(StringStream* stream) {
215  stream->Add("if has_instance_type(");
216  value()->PrintTo(stream);
217  stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
218}
219
220
221void LHasCachedArrayIndexAndBranch::PrintDataTo(StringStream* stream) {
222  stream->Add("if has_cached_array_index(");
223  value()->PrintTo(stream);
224  stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
225}
226
227
228void LClassOfTestAndBranch::PrintDataTo(StringStream* stream) {
229  stream->Add("if class_of_test(");
230  value()->PrintTo(stream);
231  stream->Add(", \"%o\") then B%d else B%d",
232              *hydrogen()->class_name(),
233              true_block_id(),
234              false_block_id());
235}
236
237
238void LTypeofIsAndBranch::PrintDataTo(StringStream* stream) {
239  stream->Add("if typeof ");
240  value()->PrintTo(stream);
241  stream->Add(" == \"%s\" then B%d else B%d",
242              hydrogen()->type_literal()->ToCString().get(),
243              true_block_id(), false_block_id());
244}
245
246
247void LStoreCodeEntry::PrintDataTo(StringStream* stream) {
248  stream->Add(" = ");
249  function()->PrintTo(stream);
250  stream->Add(".code_entry = ");
251  code_object()->PrintTo(stream);
252}
253
254
255void LInnerAllocatedObject::PrintDataTo(StringStream* stream) {
256  stream->Add(" = ");
257  base_object()->PrintTo(stream);
258  stream->Add(" + ");
259  offset()->PrintTo(stream);
260}
261
262
263void LCallJSFunction::PrintDataTo(StringStream* stream) {
264  stream->Add("= ");
265  function()->PrintTo(stream);
266  stream->Add("#%d / ", arity());
267}
268
269
270void LCallWithDescriptor::PrintDataTo(StringStream* stream) {
271  for (int i = 0; i < InputCount(); i++) {
272    InputAt(i)->PrintTo(stream);
273    stream->Add(" ");
274  }
275  stream->Add("#%d / ", arity());
276}
277
278
279void LLoadContextSlot::PrintDataTo(StringStream* stream) {
280  context()->PrintTo(stream);
281  stream->Add("[%d]", slot_index());
282}
283
284
285void LStoreContextSlot::PrintDataTo(StringStream* stream) {
286  context()->PrintTo(stream);
287  stream->Add("[%d] <- ", slot_index());
288  value()->PrintTo(stream);
289}
290
291
292void LInvokeFunction::PrintDataTo(StringStream* stream) {
293  stream->Add("= ");
294  function()->PrintTo(stream);
295  stream->Add(" #%d / ", arity());
296}
297
298
299void LCallNew::PrintDataTo(StringStream* stream) {
300  stream->Add("= ");
301  constructor()->PrintTo(stream);
302  stream->Add(" #%d / ", arity());
303}
304
305
306void LCallNewArray::PrintDataTo(StringStream* stream) {
307  stream->Add("= ");
308  constructor()->PrintTo(stream);
309  stream->Add(" #%d / ", arity());
310  ElementsKind kind = hydrogen()->elements_kind();
311  stream->Add(" (%s) ", ElementsKindToString(kind));
312}
313
314
315void LAccessArgumentsAt::PrintDataTo(StringStream* stream) {
316  arguments()->PrintTo(stream);
317  stream->Add(" length ");
318  length()->PrintTo(stream);
319  stream->Add(" index ");
320  index()->PrintTo(stream);
321}
322
323
324void LStoreNamedField::PrintDataTo(StringStream* stream) {
325  object()->PrintTo(stream);
326  OStringStream os;
327  os << hydrogen()->access() << " <- ";
328  stream->Add(os.c_str());
329  value()->PrintTo(stream);
330}
331
332
333void LStoreNamedGeneric::PrintDataTo(StringStream* stream) {
334  object()->PrintTo(stream);
335  stream->Add(".");
336  stream->Add(String::cast(*name())->ToCString().get());
337  stream->Add(" <- ");
338  value()->PrintTo(stream);
339}
340
341
342void LLoadKeyed::PrintDataTo(StringStream* stream) {
343  elements()->PrintTo(stream);
344  stream->Add("[");
345  key()->PrintTo(stream);
346  if (hydrogen()->IsDehoisted()) {
347    stream->Add(" + %d]", base_offset());
348  } else {
349    stream->Add("]");
350  }
351}
352
353
354void LStoreKeyed::PrintDataTo(StringStream* stream) {
355  elements()->PrintTo(stream);
356  stream->Add("[");
357  key()->PrintTo(stream);
358  if (hydrogen()->IsDehoisted()) {
359    stream->Add(" + %d] <-", base_offset());
360  } else {
361    stream->Add("] <- ");
362  }
363
364  if (value() == NULL) {
365    DCHECK(hydrogen()->IsConstantHoleStore() &&
366           hydrogen()->value()->representation().IsDouble());
367    stream->Add("<the hole(nan)>");
368  } else {
369    value()->PrintTo(stream);
370  }
371}
372
373
374void LStoreKeyedGeneric::PrintDataTo(StringStream* stream) {
375  object()->PrintTo(stream);
376  stream->Add("[");
377  key()->PrintTo(stream);
378  stream->Add("] <- ");
379  value()->PrintTo(stream);
380}
381
382
383void LTransitionElementsKind::PrintDataTo(StringStream* stream) {
384  object()->PrintTo(stream);
385  stream->Add(" %p -> %p", *original_map(), *transitioned_map());
386}
387
388
389int LPlatformChunk::GetNextSpillIndex(RegisterKind kind) {
390  // Skip a slot if for a double-width slot.
391  if (kind == DOUBLE_REGISTERS) spill_slot_count_++;
392  return spill_slot_count_++;
393}
394
395
396LOperand* LPlatformChunk::GetNextSpillSlot(RegisterKind kind)  {
397  int index = GetNextSpillIndex(kind);
398  if (kind == DOUBLE_REGISTERS) {
399    return LDoubleStackSlot::Create(index, zone());
400  } else {
401    DCHECK(kind == GENERAL_REGISTERS);
402    return LStackSlot::Create(index, zone());
403  }
404}
405
406
407LPlatformChunk* LChunkBuilder::Build() {
408  DCHECK(is_unused());
409  chunk_ = new(zone()) LPlatformChunk(info(), graph());
410  LPhase phase("L_Building chunk", chunk_);
411  status_ = BUILDING;
412
413  // If compiling for OSR, reserve space for the unoptimized frame,
414  // which will be subsumed into this frame.
415  if (graph()->has_osr()) {
416    for (int i = graph()->osr()->UnoptimizedFrameSlots(); i > 0; i--) {
417      chunk_->GetNextSpillIndex(GENERAL_REGISTERS);
418    }
419  }
420
421  const ZoneList<HBasicBlock*>* blocks = graph()->blocks();
422  for (int i = 0; i < blocks->length(); i++) {
423    HBasicBlock* next = NULL;
424    if (i < blocks->length() - 1) next = blocks->at(i + 1);
425    DoBasicBlock(blocks->at(i), next);
426    if (is_aborted()) return NULL;
427  }
428  status_ = DONE;
429  return chunk_;
430}
431
432
433LUnallocated* LChunkBuilder::ToUnallocated(Register reg) {
434  return new(zone()) LUnallocated(LUnallocated::FIXED_REGISTER,
435                                  Register::ToAllocationIndex(reg));
436}
437
438
439LUnallocated* LChunkBuilder::ToUnallocated(DoubleRegister reg) {
440  return new(zone()) LUnallocated(LUnallocated::FIXED_DOUBLE_REGISTER,
441                                  DoubleRegister::ToAllocationIndex(reg));
442}
443
444
445LOperand* LChunkBuilder::UseFixed(HValue* value, Register fixed_register) {
446  return Use(value, ToUnallocated(fixed_register));
447}
448
449
450LOperand* LChunkBuilder::UseFixedDouble(HValue* value, DoubleRegister reg) {
451  return Use(value, ToUnallocated(reg));
452}
453
454
455LOperand* LChunkBuilder::UseRegister(HValue* value) {
456  return Use(value, new(zone()) LUnallocated(LUnallocated::MUST_HAVE_REGISTER));
457}
458
459
460LOperand* LChunkBuilder::UseRegisterAtStart(HValue* value) {
461  return Use(value,
462             new(zone()) LUnallocated(LUnallocated::MUST_HAVE_REGISTER,
463                                      LUnallocated::USED_AT_START));
464}
465
466
467LOperand* LChunkBuilder::UseTempRegister(HValue* value) {
468  return Use(value, new(zone()) LUnallocated(LUnallocated::WRITABLE_REGISTER));
469}
470
471
472LOperand* LChunkBuilder::Use(HValue* value) {
473  return Use(value, new(zone()) LUnallocated(LUnallocated::NONE));
474}
475
476
477LOperand* LChunkBuilder::UseAtStart(HValue* value) {
478  return Use(value, new(zone()) LUnallocated(LUnallocated::NONE,
479                                     LUnallocated::USED_AT_START));
480}
481
482
483LOperand* LChunkBuilder::UseOrConstant(HValue* value) {
484  return value->IsConstant()
485      ? chunk_->DefineConstantOperand(HConstant::cast(value))
486      : Use(value);
487}
488
489
490LOperand* LChunkBuilder::UseOrConstantAtStart(HValue* value) {
491  return value->IsConstant()
492      ? chunk_->DefineConstantOperand(HConstant::cast(value))
493      : UseAtStart(value);
494}
495
496
497LOperand* LChunkBuilder::UseRegisterOrConstant(HValue* value) {
498  return value->IsConstant()
499      ? chunk_->DefineConstantOperand(HConstant::cast(value))
500      : UseRegister(value);
501}
502
503
504LOperand* LChunkBuilder::UseRegisterOrConstantAtStart(HValue* value) {
505  return value->IsConstant()
506      ? chunk_->DefineConstantOperand(HConstant::cast(value))
507      : UseRegisterAtStart(value);
508}
509
510
511LOperand* LChunkBuilder::UseConstant(HValue* value) {
512  return chunk_->DefineConstantOperand(HConstant::cast(value));
513}
514
515
516LOperand* LChunkBuilder::UseAny(HValue* value) {
517  return value->IsConstant()
518      ? chunk_->DefineConstantOperand(HConstant::cast(value))
519      :  Use(value, new(zone()) LUnallocated(LUnallocated::ANY));
520}
521
522
523LOperand* LChunkBuilder::Use(HValue* value, LUnallocated* operand) {
524  if (value->EmitAtUses()) {
525    HInstruction* instr = HInstruction::cast(value);
526    VisitInstruction(instr);
527  }
528  operand->set_virtual_register(value->id());
529  return operand;
530}
531
532
533LInstruction* LChunkBuilder::Define(LTemplateResultInstruction<1>* instr,
534                                    LUnallocated* result) {
535  result->set_virtual_register(current_instruction_->id());
536  instr->set_result(result);
537  return instr;
538}
539
540
541LInstruction* LChunkBuilder::DefineAsRegister(
542    LTemplateResultInstruction<1>* instr) {
543  return Define(instr,
544                new(zone()) LUnallocated(LUnallocated::MUST_HAVE_REGISTER));
545}
546
547
548LInstruction* LChunkBuilder::DefineAsSpilled(
549    LTemplateResultInstruction<1>* instr, int index) {
550  return Define(instr,
551                new(zone()) LUnallocated(LUnallocated::FIXED_SLOT, index));
552}
553
554
555LInstruction* LChunkBuilder::DefineSameAsFirst(
556    LTemplateResultInstruction<1>* instr) {
557  return Define(instr,
558                new(zone()) LUnallocated(LUnallocated::SAME_AS_FIRST_INPUT));
559}
560
561
562LInstruction* LChunkBuilder::DefineFixed(
563    LTemplateResultInstruction<1>* instr, Register reg) {
564  return Define(instr, ToUnallocated(reg));
565}
566
567
568LInstruction* LChunkBuilder::DefineFixedDouble(
569    LTemplateResultInstruction<1>* instr, DoubleRegister reg) {
570  return Define(instr, ToUnallocated(reg));
571}
572
573
574LInstruction* LChunkBuilder::AssignEnvironment(LInstruction* instr) {
575  HEnvironment* hydrogen_env = current_block_->last_environment();
576  int argument_index_accumulator = 0;
577  ZoneList<HValue*> objects_to_materialize(0, zone());
578  instr->set_environment(CreateEnvironment(hydrogen_env,
579                                           &argument_index_accumulator,
580                                           &objects_to_materialize));
581  return instr;
582}
583
584
585LInstruction* LChunkBuilder::MarkAsCall(LInstruction* instr,
586                                        HInstruction* hinstr,
587                                        CanDeoptimize can_deoptimize) {
588  info()->MarkAsNonDeferredCalling();
589#ifdef DEBUG
590  instr->VerifyCall();
591#endif
592  instr->MarkAsCall();
593  instr = AssignPointerMap(instr);
594
595  // If instruction does not have side-effects lazy deoptimization
596  // after the call will try to deoptimize to the point before the call.
597  // Thus we still need to attach environment to this call even if
598  // call sequence can not deoptimize eagerly.
599  bool needs_environment =
600      (can_deoptimize == CAN_DEOPTIMIZE_EAGERLY) ||
601      !hinstr->HasObservableSideEffects();
602  if (needs_environment && !instr->HasEnvironment()) {
603    instr = AssignEnvironment(instr);
604    // We can't really figure out if the environment is needed or not.
605    instr->environment()->set_has_been_used();
606  }
607
608  return instr;
609}
610
611
612LInstruction* LChunkBuilder::AssignPointerMap(LInstruction* instr) {
613  DCHECK(!instr->HasPointerMap());
614  instr->set_pointer_map(new(zone()) LPointerMap(zone()));
615  return instr;
616}
617
618
619LUnallocated* LChunkBuilder::TempRegister() {
620  LUnallocated* operand =
621      new(zone()) LUnallocated(LUnallocated::MUST_HAVE_REGISTER);
622  int vreg = allocator_->GetVirtualRegister();
623  if (!allocator_->AllocationOk()) {
624    Abort(kOutOfVirtualRegistersWhileTryingToAllocateTempRegister);
625    vreg = 0;
626  }
627  operand->set_virtual_register(vreg);
628  return operand;
629}
630
631
632LUnallocated* LChunkBuilder::TempDoubleRegister() {
633  LUnallocated* operand =
634      new(zone()) LUnallocated(LUnallocated::MUST_HAVE_DOUBLE_REGISTER);
635  int vreg = allocator_->GetVirtualRegister();
636  if (!allocator_->AllocationOk()) {
637    Abort(kOutOfVirtualRegistersWhileTryingToAllocateTempRegister);
638    vreg = 0;
639  }
640  operand->set_virtual_register(vreg);
641  return operand;
642}
643
644
645LOperand* LChunkBuilder::FixedTemp(Register reg) {
646  LUnallocated* operand = ToUnallocated(reg);
647  DCHECK(operand->HasFixedPolicy());
648  return operand;
649}
650
651
652LOperand* LChunkBuilder::FixedTemp(DoubleRegister reg) {
653  LUnallocated* operand = ToUnallocated(reg);
654  DCHECK(operand->HasFixedPolicy());
655  return operand;
656}
657
658
659LInstruction* LChunkBuilder::DoBlockEntry(HBlockEntry* instr) {
660  return new(zone()) LLabel(instr->block());
661}
662
663
664LInstruction* LChunkBuilder::DoDummyUse(HDummyUse* instr) {
665  return DefineAsRegister(new(zone()) LDummyUse(UseAny(instr->value())));
666}
667
668
669LInstruction* LChunkBuilder::DoEnvironmentMarker(HEnvironmentMarker* instr) {
670  UNREACHABLE();
671  return NULL;
672}
673
674
675LInstruction* LChunkBuilder::DoDeoptimize(HDeoptimize* instr) {
676  return AssignEnvironment(new(zone()) LDeoptimize);
677}
678
679
680LInstruction* LChunkBuilder::DoShift(Token::Value op,
681                                     HBitwiseBinaryOperation* instr) {
682  if (instr->representation().IsSmiOrInteger32()) {
683    DCHECK(instr->left()->representation().Equals(instr->representation()));
684    DCHECK(instr->right()->representation().Equals(instr->representation()));
685    LOperand* left = UseRegisterAtStart(instr->left());
686
687    HValue* right_value = instr->right();
688    LOperand* right = NULL;
689    int constant_value = 0;
690    bool does_deopt = false;
691    if (right_value->IsConstant()) {
692      HConstant* constant = HConstant::cast(right_value);
693      right = chunk_->DefineConstantOperand(constant);
694      constant_value = constant->Integer32Value() & 0x1f;
695      // Left shifts can deoptimize if we shift by > 0 and the result cannot be
696      // truncated to smi.
697      if (instr->representation().IsSmi() && constant_value > 0) {
698        does_deopt = !instr->CheckUsesForFlag(HValue::kTruncatingToSmi);
699      }
700    } else {
701      right = UseRegisterAtStart(right_value);
702    }
703
704    // Shift operations can only deoptimize if we do a logical shift
705    // by 0 and the result cannot be truncated to int32.
706    if (op == Token::SHR && constant_value == 0) {
707      if (FLAG_opt_safe_uint32_operations) {
708        does_deopt = !instr->CheckFlag(HInstruction::kUint32);
709      } else {
710        does_deopt = !instr->CheckUsesForFlag(HValue::kTruncatingToInt32);
711      }
712    }
713
714    LInstruction* result =
715        DefineAsRegister(new(zone()) LShiftI(op, left, right, does_deopt));
716    return does_deopt ? AssignEnvironment(result) : result;
717  } else {
718    return DoArithmeticT(op, instr);
719  }
720}
721
722
723LInstruction* LChunkBuilder::DoArithmeticD(Token::Value op,
724                                           HArithmeticBinaryOperation* instr) {
725  DCHECK(instr->representation().IsDouble());
726  DCHECK(instr->left()->representation().IsDouble());
727  DCHECK(instr->right()->representation().IsDouble());
728  if (op == Token::MOD) {
729    LOperand* left = UseFixedDouble(instr->left(), f2);
730    LOperand* right = UseFixedDouble(instr->right(), f4);
731    LArithmeticD* result = new(zone()) LArithmeticD(op, left, right);
732    // We call a C function for double modulo. It can't trigger a GC. We need
733    // to use fixed result register for the call.
734    // TODO(fschneider): Allow any register as input registers.
735    return MarkAsCall(DefineFixedDouble(result, f2), instr);
736  } else {
737    LOperand* left = UseRegisterAtStart(instr->left());
738    LOperand* right = UseRegisterAtStart(instr->right());
739    LArithmeticD* result = new(zone()) LArithmeticD(op, left, right);
740    return DefineAsRegister(result);
741  }
742}
743
744
745LInstruction* LChunkBuilder::DoArithmeticT(Token::Value op,
746                                           HBinaryOperation* instr) {
747  HValue* left = instr->left();
748  HValue* right = instr->right();
749  DCHECK(left->representation().IsTagged());
750  DCHECK(right->representation().IsTagged());
751  LOperand* context = UseFixed(instr->context(), cp);
752  LOperand* left_operand = UseFixed(left, a1);
753  LOperand* right_operand = UseFixed(right, a0);
754  LArithmeticT* result =
755      new(zone()) LArithmeticT(op, context, left_operand, right_operand);
756  return MarkAsCall(DefineFixed(result, v0), instr);
757}
758
759
760void LChunkBuilder::DoBasicBlock(HBasicBlock* block, HBasicBlock* next_block) {
761  DCHECK(is_building());
762  current_block_ = block;
763  next_block_ = next_block;
764  if (block->IsStartBlock()) {
765    block->UpdateEnvironment(graph_->start_environment());
766    argument_count_ = 0;
767  } else if (block->predecessors()->length() == 1) {
768    // We have a single predecessor => copy environment and outgoing
769    // argument count from the predecessor.
770    DCHECK(block->phis()->length() == 0);
771    HBasicBlock* pred = block->predecessors()->at(0);
772    HEnvironment* last_environment = pred->last_environment();
773    DCHECK(last_environment != NULL);
774    // Only copy the environment, if it is later used again.
775    if (pred->end()->SecondSuccessor() == NULL) {
776      DCHECK(pred->end()->FirstSuccessor() == block);
777    } else {
778      if (pred->end()->FirstSuccessor()->block_id() > block->block_id() ||
779          pred->end()->SecondSuccessor()->block_id() > block->block_id()) {
780        last_environment = last_environment->Copy();
781      }
782    }
783    block->UpdateEnvironment(last_environment);
784    DCHECK(pred->argument_count() >= 0);
785    argument_count_ = pred->argument_count();
786  } else {
787    // We are at a state join => process phis.
788    HBasicBlock* pred = block->predecessors()->at(0);
789    // No need to copy the environment, it cannot be used later.
790    HEnvironment* last_environment = pred->last_environment();
791    for (int i = 0; i < block->phis()->length(); ++i) {
792      HPhi* phi = block->phis()->at(i);
793      if (phi->HasMergedIndex()) {
794        last_environment->SetValueAt(phi->merged_index(), phi);
795      }
796    }
797    for (int i = 0; i < block->deleted_phis()->length(); ++i) {
798      if (block->deleted_phis()->at(i) < last_environment->length()) {
799        last_environment->SetValueAt(block->deleted_phis()->at(i),
800                                     graph_->GetConstantUndefined());
801      }
802    }
803    block->UpdateEnvironment(last_environment);
804    // Pick up the outgoing argument count of one of the predecessors.
805    argument_count_ = pred->argument_count();
806  }
807  HInstruction* current = block->first();
808  int start = chunk_->instructions()->length();
809  while (current != NULL && !is_aborted()) {
810    // Code for constants in registers is generated lazily.
811    if (!current->EmitAtUses()) {
812      VisitInstruction(current);
813    }
814    current = current->next();
815  }
816  int end = chunk_->instructions()->length() - 1;
817  if (end >= start) {
818    block->set_first_instruction_index(start);
819    block->set_last_instruction_index(end);
820  }
821  block->set_argument_count(argument_count_);
822  next_block_ = NULL;
823  current_block_ = NULL;
824}
825
826
827void LChunkBuilder::VisitInstruction(HInstruction* current) {
828  HInstruction* old_current = current_instruction_;
829  current_instruction_ = current;
830
831  LInstruction* instr = NULL;
832  if (current->CanReplaceWithDummyUses()) {
833    if (current->OperandCount() == 0) {
834      instr = DefineAsRegister(new(zone()) LDummy());
835    } else {
836      DCHECK(!current->OperandAt(0)->IsControlInstruction());
837      instr = DefineAsRegister(new(zone())
838          LDummyUse(UseAny(current->OperandAt(0))));
839    }
840    for (int i = 1; i < current->OperandCount(); ++i) {
841      if (current->OperandAt(i)->IsControlInstruction()) continue;
842      LInstruction* dummy =
843          new(zone()) LDummyUse(UseAny(current->OperandAt(i)));
844      dummy->set_hydrogen_value(current);
845      chunk_->AddInstruction(dummy, current_block_);
846    }
847  } else {
848    HBasicBlock* successor;
849    if (current->IsControlInstruction() &&
850        HControlInstruction::cast(current)->KnownSuccessorBlock(&successor) &&
851        successor != NULL) {
852      instr = new(zone()) LGoto(successor);
853    } else {
854      instr = current->CompileToLithium(this);
855    }
856  }
857
858  argument_count_ += current->argument_delta();
859  DCHECK(argument_count_ >= 0);
860
861  if (instr != NULL) {
862    AddInstruction(instr, current);
863  }
864
865  current_instruction_ = old_current;
866}
867
868
869void LChunkBuilder::AddInstruction(LInstruction* instr,
870                                   HInstruction* hydrogen_val) {
871// Associate the hydrogen instruction first, since we may need it for
872  // the ClobbersRegisters() or ClobbersDoubleRegisters() calls below.
873  instr->set_hydrogen_value(hydrogen_val);
874
875#if DEBUG
876  // Make sure that the lithium instruction has either no fixed register
877  // constraints in temps or the result OR no uses that are only used at
878  // start. If this invariant doesn't hold, the register allocator can decide
879  // to insert a split of a range immediately before the instruction due to an
880  // already allocated register needing to be used for the instruction's fixed
881  // register constraint. In this case, The register allocator won't see an
882  // interference between the split child and the use-at-start (it would if
883  // the it was just a plain use), so it is free to move the split child into
884  // the same register that is used for the use-at-start.
885  // See https://code.google.com/p/chromium/issues/detail?id=201590
886  if (!(instr->ClobbersRegisters() &&
887        instr->ClobbersDoubleRegisters(isolate()))) {
888    int fixed = 0;
889    int used_at_start = 0;
890    for (UseIterator it(instr); !it.Done(); it.Advance()) {
891      LUnallocated* operand = LUnallocated::cast(it.Current());
892      if (operand->IsUsedAtStart()) ++used_at_start;
893    }
894    if (instr->Output() != NULL) {
895      if (LUnallocated::cast(instr->Output())->HasFixedPolicy()) ++fixed;
896    }
897    for (TempIterator it(instr); !it.Done(); it.Advance()) {
898      LUnallocated* operand = LUnallocated::cast(it.Current());
899      if (operand->HasFixedPolicy()) ++fixed;
900    }
901    DCHECK(fixed == 0 || used_at_start == 0);
902  }
903#endif
904
905  if (FLAG_stress_pointer_maps && !instr->HasPointerMap()) {
906    instr = AssignPointerMap(instr);
907  }
908  if (FLAG_stress_environments && !instr->HasEnvironment()) {
909    instr = AssignEnvironment(instr);
910  }
911  chunk_->AddInstruction(instr, current_block_);
912
913  if (instr->IsCall()) {
914    HValue* hydrogen_value_for_lazy_bailout = hydrogen_val;
915    LInstruction* instruction_needing_environment = NULL;
916    if (hydrogen_val->HasObservableSideEffects()) {
917      HSimulate* sim = HSimulate::cast(hydrogen_val->next());
918      instruction_needing_environment = instr;
919      sim->ReplayEnvironment(current_block_->last_environment());
920      hydrogen_value_for_lazy_bailout = sim;
921    }
922    LInstruction* bailout = AssignEnvironment(new(zone()) LLazyBailout());
923    bailout->set_hydrogen_value(hydrogen_value_for_lazy_bailout);
924    chunk_->AddInstruction(bailout, current_block_);
925    if (instruction_needing_environment != NULL) {
926      // Store the lazy deopt environment with the instruction if needed.
927      // Right now it is only used for LInstanceOfKnownGlobal.
928      instruction_needing_environment->
929          SetDeferredLazyDeoptimizationEnvironment(bailout->environment());
930    }
931  }
932}
933
934
935LInstruction* LChunkBuilder::DoGoto(HGoto* instr) {
936  return new(zone()) LGoto(instr->FirstSuccessor());
937}
938
939
940LInstruction* LChunkBuilder::DoBranch(HBranch* instr) {
941  HValue* value = instr->value();
942  Representation r = value->representation();
943  HType type = value->type();
944  ToBooleanStub::Types expected = instr->expected_input_types();
945  if (expected.IsEmpty()) expected = ToBooleanStub::Types::Generic();
946
947  bool easy_case = !r.IsTagged() || type.IsBoolean() || type.IsSmi() ||
948      type.IsJSArray() || type.IsHeapNumber() || type.IsString();
949  LInstruction* branch = new(zone()) LBranch(UseRegister(value));
950  if (!easy_case &&
951      ((!expected.Contains(ToBooleanStub::SMI) && expected.NeedsMap()) ||
952       !expected.IsGeneric())) {
953    branch = AssignEnvironment(branch);
954  }
955  return branch;
956}
957
958
959LInstruction* LChunkBuilder::DoCompareMap(HCompareMap* instr) {
960  DCHECK(instr->value()->representation().IsTagged());
961  LOperand* value = UseRegisterAtStart(instr->value());
962  LOperand* temp = TempRegister();
963  return new(zone()) LCmpMapAndBranch(value, temp);
964}
965
966
967LInstruction* LChunkBuilder::DoArgumentsLength(HArgumentsLength* length) {
968  info()->MarkAsRequiresFrame();
969  return DefineAsRegister(
970      new(zone()) LArgumentsLength(UseRegister(length->value())));
971}
972
973
974LInstruction* LChunkBuilder::DoArgumentsElements(HArgumentsElements* elems) {
975  info()->MarkAsRequiresFrame();
976  return DefineAsRegister(new(zone()) LArgumentsElements);
977}
978
979
980LInstruction* LChunkBuilder::DoInstanceOf(HInstanceOf* instr) {
981  LOperand* context = UseFixed(instr->context(), cp);
982  LInstanceOf* result =
983      new(zone()) LInstanceOf(context, UseFixed(instr->left(), a0),
984                              UseFixed(instr->right(), a1));
985  return MarkAsCall(DefineFixed(result, v0), instr);
986}
987
988
989LInstruction* LChunkBuilder::DoInstanceOfKnownGlobal(
990    HInstanceOfKnownGlobal* instr) {
991  LInstanceOfKnownGlobal* result =
992      new(zone()) LInstanceOfKnownGlobal(
993          UseFixed(instr->context(), cp),
994          UseFixed(instr->left(), a0),
995          FixedTemp(t0));
996  return MarkAsCall(DefineFixed(result, v0), instr);
997}
998
999
1000LInstruction* LChunkBuilder::DoWrapReceiver(HWrapReceiver* instr) {
1001  LOperand* receiver = UseRegisterAtStart(instr->receiver());
1002  LOperand* function = UseRegisterAtStart(instr->function());
1003  LWrapReceiver* result = new(zone()) LWrapReceiver(receiver, function);
1004  return AssignEnvironment(DefineAsRegister(result));
1005}
1006
1007
1008LInstruction* LChunkBuilder::DoApplyArguments(HApplyArguments* instr) {
1009  LOperand* function = UseFixed(instr->function(), a1);
1010  LOperand* receiver = UseFixed(instr->receiver(), a0);
1011  LOperand* length = UseFixed(instr->length(), a2);
1012  LOperand* elements = UseFixed(instr->elements(), a3);
1013  LApplyArguments* result = new(zone()) LApplyArguments(function,
1014                                                        receiver,
1015                                                        length,
1016                                                        elements);
1017  return MarkAsCall(DefineFixed(result, v0), instr, CAN_DEOPTIMIZE_EAGERLY);
1018}
1019
1020
1021LInstruction* LChunkBuilder::DoPushArguments(HPushArguments* instr) {
1022  int argc = instr->OperandCount();
1023  for (int i = 0; i < argc; ++i) {
1024    LOperand* argument = Use(instr->argument(i));
1025    AddInstruction(new(zone()) LPushArgument(argument), instr);
1026  }
1027  return NULL;
1028}
1029
1030
1031LInstruction* LChunkBuilder::DoStoreCodeEntry(
1032    HStoreCodeEntry* store_code_entry) {
1033  LOperand* function = UseRegister(store_code_entry->function());
1034  LOperand* code_object = UseTempRegister(store_code_entry->code_object());
1035  return new(zone()) LStoreCodeEntry(function, code_object);
1036}
1037
1038
1039LInstruction* LChunkBuilder::DoInnerAllocatedObject(
1040    HInnerAllocatedObject* instr) {
1041  LOperand* base_object = UseRegisterAtStart(instr->base_object());
1042  LOperand* offset = UseRegisterOrConstantAtStart(instr->offset());
1043  return DefineAsRegister(
1044      new(zone()) LInnerAllocatedObject(base_object, offset));
1045}
1046
1047
1048LInstruction* LChunkBuilder::DoThisFunction(HThisFunction* instr) {
1049  return instr->HasNoUses()
1050      ? NULL
1051      : DefineAsRegister(new(zone()) LThisFunction);
1052}
1053
1054
1055LInstruction* LChunkBuilder::DoContext(HContext* instr) {
1056  if (instr->HasNoUses()) return NULL;
1057
1058  if (info()->IsStub()) {
1059    return DefineFixed(new(zone()) LContext, cp);
1060  }
1061
1062  return DefineAsRegister(new(zone()) LContext);
1063}
1064
1065
1066LInstruction* LChunkBuilder::DoDeclareGlobals(HDeclareGlobals* instr) {
1067  LOperand* context = UseFixed(instr->context(), cp);
1068  return MarkAsCall(new(zone()) LDeclareGlobals(context), instr);
1069}
1070
1071
1072LInstruction* LChunkBuilder::DoCallJSFunction(
1073    HCallJSFunction* instr) {
1074  LOperand* function = UseFixed(instr->function(), a1);
1075
1076  LCallJSFunction* result = new(zone()) LCallJSFunction(function);
1077
1078  return MarkAsCall(DefineFixed(result, v0), instr);
1079}
1080
1081
1082LInstruction* LChunkBuilder::DoCallWithDescriptor(
1083    HCallWithDescriptor* instr) {
1084  CallInterfaceDescriptor descriptor = instr->descriptor();
1085
1086  LOperand* target = UseRegisterOrConstantAtStart(instr->target());
1087  ZoneList<LOperand*> ops(instr->OperandCount(), zone());
1088  ops.Add(target, zone());
1089  for (int i = 1; i < instr->OperandCount(); i++) {
1090    LOperand* op =
1091        UseFixed(instr->OperandAt(i), descriptor.GetParameterRegister(i - 1));
1092    ops.Add(op, zone());
1093  }
1094
1095  LCallWithDescriptor* result = new(zone()) LCallWithDescriptor(
1096      descriptor, ops, zone());
1097  return MarkAsCall(DefineFixed(result, v0), instr);
1098}
1099
1100
1101LInstruction* LChunkBuilder::DoTailCallThroughMegamorphicCache(
1102    HTailCallThroughMegamorphicCache* instr) {
1103  LOperand* context = UseFixed(instr->context(), cp);
1104  LOperand* receiver_register =
1105      UseFixed(instr->receiver(), LoadDescriptor::ReceiverRegister());
1106  LOperand* name_register =
1107      UseFixed(instr->name(), LoadDescriptor::NameRegister());
1108  // Not marked as call. It can't deoptimize, and it never returns.
1109  return new (zone()) LTailCallThroughMegamorphicCache(
1110      context, receiver_register, name_register);
1111}
1112
1113
1114LInstruction* LChunkBuilder::DoInvokeFunction(HInvokeFunction* instr) {
1115  LOperand* context = UseFixed(instr->context(), cp);
1116  LOperand* function = UseFixed(instr->function(), a1);
1117  LInvokeFunction* result = new(zone()) LInvokeFunction(context, function);
1118  return MarkAsCall(DefineFixed(result, v0), instr, CANNOT_DEOPTIMIZE_EAGERLY);
1119}
1120
1121
1122LInstruction* LChunkBuilder::DoUnaryMathOperation(HUnaryMathOperation* instr) {
1123  switch (instr->op()) {
1124    case kMathFloor:
1125      return DoMathFloor(instr);
1126    case kMathRound:
1127      return DoMathRound(instr);
1128    case kMathFround:
1129      return DoMathFround(instr);
1130    case kMathAbs:
1131      return DoMathAbs(instr);
1132    case kMathLog:
1133      return DoMathLog(instr);
1134    case kMathExp:
1135      return DoMathExp(instr);
1136    case kMathSqrt:
1137      return DoMathSqrt(instr);
1138    case kMathPowHalf:
1139      return DoMathPowHalf(instr);
1140    case kMathClz32:
1141      return DoMathClz32(instr);
1142    default:
1143      UNREACHABLE();
1144      return NULL;
1145  }
1146}
1147
1148
1149LInstruction* LChunkBuilder::DoMathLog(HUnaryMathOperation* instr) {
1150  DCHECK(instr->representation().IsDouble());
1151  DCHECK(instr->value()->representation().IsDouble());
1152  LOperand* input = UseFixedDouble(instr->value(), f4);
1153  return MarkAsCall(DefineFixedDouble(new(zone()) LMathLog(input), f4), instr);
1154}
1155
1156
1157LInstruction* LChunkBuilder::DoMathClz32(HUnaryMathOperation* instr) {
1158  LOperand* input = UseRegisterAtStart(instr->value());
1159  LMathClz32* result = new(zone()) LMathClz32(input);
1160  return DefineAsRegister(result);
1161}
1162
1163
1164LInstruction* LChunkBuilder::DoMathExp(HUnaryMathOperation* instr) {
1165  DCHECK(instr->representation().IsDouble());
1166  DCHECK(instr->value()->representation().IsDouble());
1167  LOperand* input = UseRegister(instr->value());
1168  LOperand* temp1 = TempRegister();
1169  LOperand* temp2 = TempRegister();
1170  LOperand* double_temp = TempDoubleRegister();
1171  LMathExp* result = new(zone()) LMathExp(input, double_temp, temp1, temp2);
1172  return DefineAsRegister(result);
1173}
1174
1175
1176LInstruction* LChunkBuilder::DoMathPowHalf(HUnaryMathOperation* instr) {
1177  // Input cannot be the same as the result, see LCodeGen::DoMathPowHalf.
1178  LOperand* input = UseFixedDouble(instr->value(), f8);
1179  LOperand* temp = TempDoubleRegister();
1180  LMathPowHalf* result = new(zone()) LMathPowHalf(input, temp);
1181  return DefineFixedDouble(result, f4);
1182}
1183
1184
1185LInstruction* LChunkBuilder::DoMathFround(HUnaryMathOperation* instr) {
1186  LOperand* input = UseRegister(instr->value());
1187  LMathFround* result = new (zone()) LMathFround(input);
1188  return DefineAsRegister(result);
1189}
1190
1191
1192LInstruction* LChunkBuilder::DoMathAbs(HUnaryMathOperation* instr) {
1193  Representation r = instr->value()->representation();
1194  LOperand* context = (r.IsDouble() || r.IsSmiOrInteger32())
1195      ? NULL
1196      : UseFixed(instr->context(), cp);
1197  LOperand* input = UseRegister(instr->value());
1198  LInstruction* result =
1199      DefineAsRegister(new(zone()) LMathAbs(context, input));
1200  if (!r.IsDouble() && !r.IsSmiOrInteger32()) result = AssignPointerMap(result);
1201  if (!r.IsDouble()) result = AssignEnvironment(result);
1202  return result;
1203}
1204
1205
1206LInstruction* LChunkBuilder::DoMathFloor(HUnaryMathOperation* instr) {
1207  LOperand* input = UseRegister(instr->value());
1208  LOperand* temp = TempRegister();
1209  LMathFloor* result = new(zone()) LMathFloor(input, temp);
1210  return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
1211}
1212
1213
1214LInstruction* LChunkBuilder::DoMathSqrt(HUnaryMathOperation* instr) {
1215  LOperand* input = UseRegister(instr->value());
1216  LMathSqrt* result = new(zone()) LMathSqrt(input);
1217  return DefineAsRegister(result);
1218}
1219
1220
1221LInstruction* LChunkBuilder::DoMathRound(HUnaryMathOperation* instr) {
1222  LOperand* input = UseRegister(instr->value());
1223  LOperand* temp = TempDoubleRegister();
1224  LMathRound* result = new(zone()) LMathRound(input, temp);
1225  return AssignEnvironment(DefineAsRegister(result));
1226}
1227
1228
1229LInstruction* LChunkBuilder::DoCallNew(HCallNew* instr) {
1230  LOperand* context = UseFixed(instr->context(), cp);
1231  LOperand* constructor = UseFixed(instr->constructor(), a1);
1232  LCallNew* result = new(zone()) LCallNew(context, constructor);
1233  return MarkAsCall(DefineFixed(result, v0), instr);
1234}
1235
1236
1237LInstruction* LChunkBuilder::DoCallNewArray(HCallNewArray* instr) {
1238  LOperand* context = UseFixed(instr->context(), cp);
1239  LOperand* constructor = UseFixed(instr->constructor(), a1);
1240  LCallNewArray* result = new(zone()) LCallNewArray(context, constructor);
1241  return MarkAsCall(DefineFixed(result, v0), instr);
1242}
1243
1244
1245LInstruction* LChunkBuilder::DoCallFunction(HCallFunction* instr) {
1246  LOperand* context = UseFixed(instr->context(), cp);
1247  LOperand* function = UseFixed(instr->function(), a1);
1248  LCallFunction* call = new(zone()) LCallFunction(context, function);
1249  return MarkAsCall(DefineFixed(call, v0), instr);
1250}
1251
1252
1253LInstruction* LChunkBuilder::DoCallRuntime(HCallRuntime* instr) {
1254  LOperand* context = UseFixed(instr->context(), cp);
1255  return MarkAsCall(DefineFixed(new(zone()) LCallRuntime(context), v0), instr);
1256}
1257
1258
1259LInstruction* LChunkBuilder::DoRor(HRor* instr) {
1260  return DoShift(Token::ROR, instr);
1261}
1262
1263
1264LInstruction* LChunkBuilder::DoShr(HShr* instr) {
1265  return DoShift(Token::SHR, instr);
1266}
1267
1268
1269LInstruction* LChunkBuilder::DoSar(HSar* instr) {
1270  return DoShift(Token::SAR, instr);
1271}
1272
1273
1274LInstruction* LChunkBuilder::DoShl(HShl* instr) {
1275  return DoShift(Token::SHL, instr);
1276}
1277
1278
1279LInstruction* LChunkBuilder::DoBitwise(HBitwise* instr) {
1280  if (instr->representation().IsSmiOrInteger32()) {
1281    DCHECK(instr->left()->representation().Equals(instr->representation()));
1282    DCHECK(instr->right()->representation().Equals(instr->representation()));
1283    DCHECK(instr->CheckFlag(HValue::kTruncatingToInt32));
1284
1285    LOperand* left = UseRegisterAtStart(instr->BetterLeftOperand());
1286    LOperand* right = UseOrConstantAtStart(instr->BetterRightOperand());
1287    return DefineAsRegister(new(zone()) LBitI(left, right));
1288  } else {
1289    return DoArithmeticT(instr->op(), instr);
1290  }
1291}
1292
1293
1294LInstruction* LChunkBuilder::DoDivByPowerOf2I(HDiv* instr) {
1295  DCHECK(instr->representation().IsSmiOrInteger32());
1296  DCHECK(instr->left()->representation().Equals(instr->representation()));
1297  DCHECK(instr->right()->representation().Equals(instr->representation()));
1298  LOperand* dividend = UseRegister(instr->left());
1299  int32_t divisor = instr->right()->GetInteger32Constant();
1300  LInstruction* result = DefineAsRegister(new(zone()) LDivByPowerOf2I(
1301          dividend, divisor));
1302  if ((instr->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0) ||
1303      (instr->CheckFlag(HValue::kCanOverflow) && divisor == -1) ||
1304      (!instr->CheckFlag(HInstruction::kAllUsesTruncatingToInt32) &&
1305       divisor != 1 && divisor != -1)) {
1306    result = AssignEnvironment(result);
1307  }
1308  return result;
1309}
1310
1311
1312LInstruction* LChunkBuilder::DoDivByConstI(HDiv* instr) {
1313  DCHECK(instr->representation().IsInteger32());
1314  DCHECK(instr->left()->representation().Equals(instr->representation()));
1315  DCHECK(instr->right()->representation().Equals(instr->representation()));
1316  LOperand* dividend = UseRegister(instr->left());
1317  int32_t divisor = instr->right()->GetInteger32Constant();
1318  LInstruction* result = DefineAsRegister(new(zone()) LDivByConstI(
1319          dividend, divisor));
1320  if (divisor == 0 ||
1321      (instr->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0) ||
1322      !instr->CheckFlag(HInstruction::kAllUsesTruncatingToInt32)) {
1323    result = AssignEnvironment(result);
1324  }
1325  return result;
1326}
1327
1328
1329LInstruction* LChunkBuilder::DoDivI(HDiv* instr) {
1330  DCHECK(instr->representation().IsSmiOrInteger32());
1331  DCHECK(instr->left()->representation().Equals(instr->representation()));
1332  DCHECK(instr->right()->representation().Equals(instr->representation()));
1333  LOperand* dividend = UseRegister(instr->left());
1334  LOperand* divisor = UseRegister(instr->right());
1335  LOperand* temp = TempRegister();
1336  LInstruction* result =
1337      DefineAsRegister(new(zone()) LDivI(dividend, divisor, temp));
1338  if (instr->CheckFlag(HValue::kCanBeDivByZero) ||
1339      instr->CheckFlag(HValue::kBailoutOnMinusZero) ||
1340      (instr->CheckFlag(HValue::kCanOverflow) &&
1341       !instr->CheckFlag(HValue::kAllUsesTruncatingToInt32)) ||
1342      (!instr->IsMathFloorOfDiv() &&
1343       !instr->CheckFlag(HValue::kAllUsesTruncatingToInt32))) {
1344    result = AssignEnvironment(result);
1345  }
1346  return result;
1347}
1348
1349
1350LInstruction* LChunkBuilder::DoDiv(HDiv* instr) {
1351  if (instr->representation().IsSmiOrInteger32()) {
1352    if (instr->RightIsPowerOf2()) {
1353      return DoDivByPowerOf2I(instr);
1354    } else if (instr->right()->IsConstant()) {
1355      return DoDivByConstI(instr);
1356    } else {
1357      return DoDivI(instr);
1358    }
1359  } else if (instr->representation().IsDouble()) {
1360    return DoArithmeticD(Token::DIV, instr);
1361  } else {
1362    return DoArithmeticT(Token::DIV, instr);
1363  }
1364}
1365
1366
1367LInstruction* LChunkBuilder::DoFlooringDivByPowerOf2I(HMathFloorOfDiv* instr) {
1368  LOperand* dividend = UseRegisterAtStart(instr->left());
1369  int32_t divisor = instr->right()->GetInteger32Constant();
1370  LInstruction* result = DefineAsRegister(new(zone()) LFlooringDivByPowerOf2I(
1371          dividend, divisor));
1372  if ((instr->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0) ||
1373      (instr->CheckFlag(HValue::kLeftCanBeMinInt) && divisor == -1)) {
1374    result = AssignEnvironment(result);
1375  }
1376  return result;
1377}
1378
1379
1380LInstruction* LChunkBuilder::DoFlooringDivByConstI(HMathFloorOfDiv* instr) {
1381  DCHECK(instr->representation().IsInteger32());
1382  DCHECK(instr->left()->representation().Equals(instr->representation()));
1383  DCHECK(instr->right()->representation().Equals(instr->representation()));
1384  LOperand* dividend = UseRegister(instr->left());
1385  int32_t divisor = instr->right()->GetInteger32Constant();
1386  LOperand* temp =
1387      ((divisor > 0 && !instr->CheckFlag(HValue::kLeftCanBeNegative)) ||
1388       (divisor < 0 && !instr->CheckFlag(HValue::kLeftCanBePositive))) ?
1389      NULL : TempRegister();
1390  LInstruction* result = DefineAsRegister(
1391      new(zone()) LFlooringDivByConstI(dividend, divisor, temp));
1392  if (divisor == 0 ||
1393      (instr->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0)) {
1394    result = AssignEnvironment(result);
1395  }
1396  return result;
1397}
1398
1399
1400LInstruction* LChunkBuilder::DoFlooringDivI(HMathFloorOfDiv* instr) {
1401  DCHECK(instr->representation().IsSmiOrInteger32());
1402  DCHECK(instr->left()->representation().Equals(instr->representation()));
1403  DCHECK(instr->right()->representation().Equals(instr->representation()));
1404  LOperand* dividend = UseRegister(instr->left());
1405  LOperand* divisor = UseRegister(instr->right());
1406  LFlooringDivI* div = new(zone()) LFlooringDivI(dividend, divisor);
1407  return AssignEnvironment(DefineAsRegister(div));
1408}
1409
1410
1411LInstruction* LChunkBuilder::DoMathFloorOfDiv(HMathFloorOfDiv* instr) {
1412  if (instr->RightIsPowerOf2()) {
1413    return DoFlooringDivByPowerOf2I(instr);
1414  } else if (instr->right()->IsConstant()) {
1415    return DoFlooringDivByConstI(instr);
1416  } else {
1417    return DoFlooringDivI(instr);
1418  }
1419}
1420
1421
1422LInstruction* LChunkBuilder::DoModByPowerOf2I(HMod* instr) {
1423  DCHECK(instr->representation().IsSmiOrInteger32());
1424  DCHECK(instr->left()->representation().Equals(instr->representation()));
1425  DCHECK(instr->right()->representation().Equals(instr->representation()));
1426  LOperand* dividend = UseRegisterAtStart(instr->left());
1427  int32_t divisor = instr->right()->GetInteger32Constant();
1428  LInstruction* result = DefineSameAsFirst(new(zone()) LModByPowerOf2I(
1429          dividend, divisor));
1430  if (instr->CheckFlag(HValue::kLeftCanBeNegative) &&
1431      instr->CheckFlag(HValue::kBailoutOnMinusZero)) {
1432    result = AssignEnvironment(result);
1433  }
1434  return result;
1435}
1436
1437
1438LInstruction* LChunkBuilder::DoModByConstI(HMod* instr) {
1439  DCHECK(instr->representation().IsSmiOrInteger32());
1440  DCHECK(instr->left()->representation().Equals(instr->representation()));
1441  DCHECK(instr->right()->representation().Equals(instr->representation()));
1442  LOperand* dividend = UseRegister(instr->left());
1443  int32_t divisor = instr->right()->GetInteger32Constant();
1444  LInstruction* result = DefineAsRegister(new(zone()) LModByConstI(
1445          dividend, divisor));
1446  if (divisor == 0 || instr->CheckFlag(HValue::kBailoutOnMinusZero)) {
1447    result = AssignEnvironment(result);
1448  }
1449  return result;
1450}
1451
1452
1453LInstruction* LChunkBuilder::DoModI(HMod* instr) {
1454  DCHECK(instr->representation().IsSmiOrInteger32());
1455  DCHECK(instr->left()->representation().Equals(instr->representation()));
1456  DCHECK(instr->right()->representation().Equals(instr->representation()));
1457  LOperand* dividend = UseRegister(instr->left());
1458  LOperand* divisor = UseRegister(instr->right());
1459  LInstruction* result = DefineAsRegister(new(zone()) LModI(
1460      dividend, divisor));
1461  if (instr->CheckFlag(HValue::kCanBeDivByZero) ||
1462      instr->CheckFlag(HValue::kBailoutOnMinusZero)) {
1463    result = AssignEnvironment(result);
1464  }
1465  return result;
1466}
1467
1468
1469LInstruction* LChunkBuilder::DoMod(HMod* instr) {
1470  if (instr->representation().IsSmiOrInteger32()) {
1471    return instr->RightIsPowerOf2() ? DoModByPowerOf2I(instr) : DoModI(instr);
1472  } else if (instr->representation().IsDouble()) {
1473    return DoArithmeticD(Token::MOD, instr);
1474  } else {
1475    return DoArithmeticT(Token::MOD, instr);
1476  }
1477}
1478
1479
1480LInstruction* LChunkBuilder::DoMul(HMul* instr) {
1481  if (instr->representation().IsSmiOrInteger32()) {
1482    DCHECK(instr->left()->representation().Equals(instr->representation()));
1483    DCHECK(instr->right()->representation().Equals(instr->representation()));
1484    HValue* left = instr->BetterLeftOperand();
1485    HValue* right = instr->BetterRightOperand();
1486    LOperand* left_op;
1487    LOperand* right_op;
1488    bool can_overflow = instr->CheckFlag(HValue::kCanOverflow);
1489    bool bailout_on_minus_zero = instr->CheckFlag(HValue::kBailoutOnMinusZero);
1490
1491    if (right->IsConstant()) {
1492      HConstant* constant = HConstant::cast(right);
1493      int32_t constant_value = constant->Integer32Value();
1494      // Constants -1, 0 and 1 can be optimized if the result can overflow.
1495      // For other constants, it can be optimized only without overflow.
1496      if (!can_overflow || ((constant_value >= -1) && (constant_value <= 1))) {
1497        left_op = UseRegisterAtStart(left);
1498        right_op = UseConstant(right);
1499      } else {
1500        if (bailout_on_minus_zero) {
1501          left_op = UseRegister(left);
1502        } else {
1503          left_op = UseRegisterAtStart(left);
1504        }
1505        right_op = UseRegister(right);
1506      }
1507    } else {
1508      if (bailout_on_minus_zero) {
1509        left_op = UseRegister(left);
1510      } else {
1511        left_op = UseRegisterAtStart(left);
1512      }
1513      right_op = UseRegister(right);
1514    }
1515    LMulI* mul = new(zone()) LMulI(left_op, right_op);
1516    if (can_overflow || bailout_on_minus_zero) {
1517      AssignEnvironment(mul);
1518    }
1519    return DefineAsRegister(mul);
1520
1521  } else if (instr->representation().IsDouble()) {
1522    if (IsMipsArchVariant(kMips32r2) || IsMipsArchVariant(kMips32r6)) {
1523      if (instr->HasOneUse() && instr->uses().value()->IsAdd()) {
1524        HAdd* add = HAdd::cast(instr->uses().value());
1525        if (instr == add->left()) {
1526          // This mul is the lhs of an add. The add and mul will be folded
1527          // into a multiply-add.
1528          return NULL;
1529        }
1530        if (instr == add->right() && !add->left()->IsMul()) {
1531          // This mul is the rhs of an add, where the lhs is not another mul.
1532          // The add and mul will be folded into a multiply-add.
1533          return NULL;
1534        }
1535      }
1536    }
1537    return DoArithmeticD(Token::MUL, instr);
1538  } else {
1539    return DoArithmeticT(Token::MUL, instr);
1540  }
1541}
1542
1543
1544LInstruction* LChunkBuilder::DoSub(HSub* instr) {
1545  if (instr->representation().IsSmiOrInteger32()) {
1546    DCHECK(instr->left()->representation().Equals(instr->representation()));
1547    DCHECK(instr->right()->representation().Equals(instr->representation()));
1548    LOperand* left = UseRegisterAtStart(instr->left());
1549    LOperand* right = UseOrConstantAtStart(instr->right());
1550    LSubI* sub = new(zone()) LSubI(left, right);
1551    LInstruction* result = DefineAsRegister(sub);
1552    if (instr->CheckFlag(HValue::kCanOverflow)) {
1553      result = AssignEnvironment(result);
1554    }
1555    return result;
1556  } else if (instr->representation().IsDouble()) {
1557    return DoArithmeticD(Token::SUB, instr);
1558  } else {
1559    return DoArithmeticT(Token::SUB, instr);
1560  }
1561}
1562
1563
1564LInstruction* LChunkBuilder::DoMultiplyAdd(HMul* mul, HValue* addend) {
1565  LOperand* multiplier_op = UseRegisterAtStart(mul->left());
1566  LOperand* multiplicand_op = UseRegisterAtStart(mul->right());
1567  LOperand* addend_op = UseRegisterAtStart(addend);
1568  return DefineSameAsFirst(new(zone()) LMultiplyAddD(addend_op, multiplier_op,
1569                                                     multiplicand_op));
1570}
1571
1572
1573LInstruction* LChunkBuilder::DoAdd(HAdd* instr) {
1574  if (instr->representation().IsSmiOrInteger32()) {
1575    DCHECK(instr->left()->representation().Equals(instr->representation()));
1576    DCHECK(instr->right()->representation().Equals(instr->representation()));
1577    LOperand* left = UseRegisterAtStart(instr->BetterLeftOperand());
1578    LOperand* right = UseOrConstantAtStart(instr->BetterRightOperand());
1579    LAddI* add = new(zone()) LAddI(left, right);
1580    LInstruction* result = DefineAsRegister(add);
1581    if (instr->CheckFlag(HValue::kCanOverflow)) {
1582      result = AssignEnvironment(result);
1583    }
1584    return result;
1585  } else if (instr->representation().IsExternal()) {
1586    DCHECK(instr->left()->representation().IsExternal());
1587    DCHECK(instr->right()->representation().IsInteger32());
1588    DCHECK(!instr->CheckFlag(HValue::kCanOverflow));
1589    LOperand* left = UseRegisterAtStart(instr->left());
1590    LOperand* right = UseOrConstantAtStart(instr->right());
1591    LAddI* add = new(zone()) LAddI(left, right);
1592    LInstruction* result = DefineAsRegister(add);
1593    return result;
1594  } else if (instr->representation().IsDouble()) {
1595    if (IsMipsArchVariant(kMips32r2) || IsMipsArchVariant(kMips32r6)) {
1596      if (instr->left()->IsMul())
1597        return DoMultiplyAdd(HMul::cast(instr->left()), instr->right());
1598
1599      if (instr->right()->IsMul()) {
1600        DCHECK(!instr->left()->IsMul());
1601        return DoMultiplyAdd(HMul::cast(instr->right()), instr->left());
1602      }
1603    }
1604    return DoArithmeticD(Token::ADD, instr);
1605  } else {
1606    return DoArithmeticT(Token::ADD, instr);
1607  }
1608}
1609
1610
1611LInstruction* LChunkBuilder::DoMathMinMax(HMathMinMax* instr) {
1612  LOperand* left = NULL;
1613  LOperand* right = NULL;
1614  if (instr->representation().IsSmiOrInteger32()) {
1615    DCHECK(instr->left()->representation().Equals(instr->representation()));
1616    DCHECK(instr->right()->representation().Equals(instr->representation()));
1617    left = UseRegisterAtStart(instr->BetterLeftOperand());
1618    right = UseOrConstantAtStart(instr->BetterRightOperand());
1619  } else {
1620    DCHECK(instr->representation().IsDouble());
1621    DCHECK(instr->left()->representation().IsDouble());
1622    DCHECK(instr->right()->representation().IsDouble());
1623    left = UseRegisterAtStart(instr->left());
1624    right = UseRegisterAtStart(instr->right());
1625  }
1626  return DefineAsRegister(new(zone()) LMathMinMax(left, right));
1627}
1628
1629
1630LInstruction* LChunkBuilder::DoPower(HPower* instr) {
1631  DCHECK(instr->representation().IsDouble());
1632  // We call a C function for double power. It can't trigger a GC.
1633  // We need to use fixed result register for the call.
1634  Representation exponent_type = instr->right()->representation();
1635  DCHECK(instr->left()->representation().IsDouble());
1636  LOperand* left = UseFixedDouble(instr->left(), f2);
1637  LOperand* right =
1638      exponent_type.IsDouble()
1639          ? UseFixedDouble(instr->right(), f4)
1640          : UseFixed(instr->right(), MathPowTaggedDescriptor::exponent());
1641  LPower* result = new(zone()) LPower(left, right);
1642  return MarkAsCall(DefineFixedDouble(result, f0),
1643                    instr,
1644                    CAN_DEOPTIMIZE_EAGERLY);
1645}
1646
1647
1648LInstruction* LChunkBuilder::DoCompareGeneric(HCompareGeneric* instr) {
1649  DCHECK(instr->left()->representation().IsTagged());
1650  DCHECK(instr->right()->representation().IsTagged());
1651  LOperand* context = UseFixed(instr->context(), cp);
1652  LOperand* left = UseFixed(instr->left(), a1);
1653  LOperand* right = UseFixed(instr->right(), a0);
1654  LCmpT* result = new(zone()) LCmpT(context, left, right);
1655  return MarkAsCall(DefineFixed(result, v0), instr);
1656}
1657
1658
1659LInstruction* LChunkBuilder::DoCompareNumericAndBranch(
1660    HCompareNumericAndBranch* instr) {
1661  Representation r = instr->representation();
1662  if (r.IsSmiOrInteger32()) {
1663    DCHECK(instr->left()->representation().Equals(r));
1664    DCHECK(instr->right()->representation().Equals(r));
1665    LOperand* left = UseRegisterOrConstantAtStart(instr->left());
1666    LOperand* right = UseRegisterOrConstantAtStart(instr->right());
1667    return new(zone()) LCompareNumericAndBranch(left, right);
1668  } else {
1669    DCHECK(r.IsDouble());
1670    DCHECK(instr->left()->representation().IsDouble());
1671    DCHECK(instr->right()->representation().IsDouble());
1672    LOperand* left = UseRegisterAtStart(instr->left());
1673    LOperand* right = UseRegisterAtStart(instr->right());
1674    return new(zone()) LCompareNumericAndBranch(left, right);
1675  }
1676}
1677
1678
1679LInstruction* LChunkBuilder::DoCompareObjectEqAndBranch(
1680    HCompareObjectEqAndBranch* instr) {
1681  LOperand* left = UseRegisterAtStart(instr->left());
1682  LOperand* right = UseRegisterAtStart(instr->right());
1683  return new(zone()) LCmpObjectEqAndBranch(left, right);
1684}
1685
1686
1687LInstruction* LChunkBuilder::DoCompareHoleAndBranch(
1688    HCompareHoleAndBranch* instr) {
1689  LOperand* value = UseRegisterAtStart(instr->value());
1690  return new(zone()) LCmpHoleAndBranch(value);
1691}
1692
1693
1694LInstruction* LChunkBuilder::DoCompareMinusZeroAndBranch(
1695    HCompareMinusZeroAndBranch* instr) {
1696  LOperand* value = UseRegister(instr->value());
1697  LOperand* scratch = TempRegister();
1698  return new(zone()) LCompareMinusZeroAndBranch(value, scratch);
1699}
1700
1701
1702LInstruction* LChunkBuilder::DoIsObjectAndBranch(HIsObjectAndBranch* instr) {
1703  DCHECK(instr->value()->representation().IsTagged());
1704  LOperand* temp = TempRegister();
1705  return new(zone()) LIsObjectAndBranch(UseRegisterAtStart(instr->value()),
1706                                        temp);
1707}
1708
1709
1710LInstruction* LChunkBuilder::DoIsStringAndBranch(HIsStringAndBranch* instr) {
1711  DCHECK(instr->value()->representation().IsTagged());
1712  LOperand* temp = TempRegister();
1713  return new(zone()) LIsStringAndBranch(UseRegisterAtStart(instr->value()),
1714                                        temp);
1715}
1716
1717
1718LInstruction* LChunkBuilder::DoIsSmiAndBranch(HIsSmiAndBranch* instr) {
1719  DCHECK(instr->value()->representation().IsTagged());
1720  return new(zone()) LIsSmiAndBranch(Use(instr->value()));
1721}
1722
1723
1724LInstruction* LChunkBuilder::DoIsUndetectableAndBranch(
1725    HIsUndetectableAndBranch* instr) {
1726  DCHECK(instr->value()->representation().IsTagged());
1727  return new(zone()) LIsUndetectableAndBranch(
1728      UseRegisterAtStart(instr->value()), TempRegister());
1729}
1730
1731
1732LInstruction* LChunkBuilder::DoStringCompareAndBranch(
1733    HStringCompareAndBranch* instr) {
1734  DCHECK(instr->left()->representation().IsTagged());
1735  DCHECK(instr->right()->representation().IsTagged());
1736  LOperand* context = UseFixed(instr->context(), cp);
1737  LOperand* left = UseFixed(instr->left(), a1);
1738  LOperand* right = UseFixed(instr->right(), a0);
1739  LStringCompareAndBranch* result =
1740      new(zone()) LStringCompareAndBranch(context, left, right);
1741  return MarkAsCall(result, instr);
1742}
1743
1744
1745LInstruction* LChunkBuilder::DoHasInstanceTypeAndBranch(
1746    HHasInstanceTypeAndBranch* instr) {
1747  DCHECK(instr->value()->representation().IsTagged());
1748  LOperand* value = UseRegisterAtStart(instr->value());
1749  return new(zone()) LHasInstanceTypeAndBranch(value);
1750}
1751
1752
1753LInstruction* LChunkBuilder::DoGetCachedArrayIndex(
1754    HGetCachedArrayIndex* instr)  {
1755  DCHECK(instr->value()->representation().IsTagged());
1756  LOperand* value = UseRegisterAtStart(instr->value());
1757
1758  return DefineAsRegister(new(zone()) LGetCachedArrayIndex(value));
1759}
1760
1761
1762LInstruction* LChunkBuilder::DoHasCachedArrayIndexAndBranch(
1763    HHasCachedArrayIndexAndBranch* instr) {
1764  DCHECK(instr->value()->representation().IsTagged());
1765  return new(zone()) LHasCachedArrayIndexAndBranch(
1766      UseRegisterAtStart(instr->value()));
1767}
1768
1769
1770LInstruction* LChunkBuilder::DoClassOfTestAndBranch(
1771    HClassOfTestAndBranch* instr) {
1772  DCHECK(instr->value()->representation().IsTagged());
1773  return new(zone()) LClassOfTestAndBranch(UseRegister(instr->value()),
1774                                           TempRegister());
1775}
1776
1777
1778LInstruction* LChunkBuilder::DoMapEnumLength(HMapEnumLength* instr) {
1779  LOperand* map = UseRegisterAtStart(instr->value());
1780  return DefineAsRegister(new(zone()) LMapEnumLength(map));
1781}
1782
1783
1784LInstruction* LChunkBuilder::DoDateField(HDateField* instr) {
1785  LOperand* object = UseFixed(instr->value(), a0);
1786  LDateField* result =
1787      new(zone()) LDateField(object, FixedTemp(a1), instr->index());
1788  return MarkAsCall(DefineFixed(result, v0), instr, CAN_DEOPTIMIZE_EAGERLY);
1789}
1790
1791
1792LInstruction* LChunkBuilder::DoSeqStringGetChar(HSeqStringGetChar* instr) {
1793  LOperand* string = UseRegisterAtStart(instr->string());
1794  LOperand* index = UseRegisterOrConstantAtStart(instr->index());
1795  return DefineAsRegister(new(zone()) LSeqStringGetChar(string, index));
1796}
1797
1798
1799LInstruction* LChunkBuilder::DoSeqStringSetChar(HSeqStringSetChar* instr) {
1800  LOperand* string = UseRegisterAtStart(instr->string());
1801  LOperand* index = FLAG_debug_code
1802      ? UseRegisterAtStart(instr->index())
1803      : UseRegisterOrConstantAtStart(instr->index());
1804  LOperand* value = UseRegisterAtStart(instr->value());
1805  LOperand* context = FLAG_debug_code ? UseFixed(instr->context(), cp) : NULL;
1806  return new(zone()) LSeqStringSetChar(context, string, index, value);
1807}
1808
1809
1810LInstruction* LChunkBuilder::DoBoundsCheck(HBoundsCheck* instr) {
1811  if (!FLAG_debug_code && instr->skip_check()) return NULL;
1812  LOperand* index = UseRegisterOrConstantAtStart(instr->index());
1813  LOperand* length = !index->IsConstantOperand()
1814  ? UseRegisterOrConstantAtStart(instr->length())
1815  : UseRegisterAtStart(instr->length());
1816  LInstruction* result = new(zone()) LBoundsCheck(index, length);
1817  if (!FLAG_debug_code || !instr->skip_check()) {
1818    result = AssignEnvironment(result);
1819  }
1820  return result;
1821}
1822
1823
1824LInstruction* LChunkBuilder::DoBoundsCheckBaseIndexInformation(
1825    HBoundsCheckBaseIndexInformation* instr) {
1826  UNREACHABLE();
1827  return NULL;
1828}
1829
1830
1831LInstruction* LChunkBuilder::DoAbnormalExit(HAbnormalExit* instr) {
1832  // The control instruction marking the end of a block that completed
1833  // abruptly (e.g., threw an exception).  There is nothing specific to do.
1834  return NULL;
1835}
1836
1837
1838LInstruction* LChunkBuilder::DoUseConst(HUseConst* instr) {
1839  return NULL;
1840}
1841
1842
1843LInstruction* LChunkBuilder::DoForceRepresentation(HForceRepresentation* bad) {
1844  // All HForceRepresentation instructions should be eliminated in the
1845  // representation change phase of Hydrogen.
1846  UNREACHABLE();
1847  return NULL;
1848}
1849
1850
1851LInstruction* LChunkBuilder::DoChange(HChange* instr) {
1852  Representation from = instr->from();
1853  Representation to = instr->to();
1854  HValue* val = instr->value();
1855  if (from.IsSmi()) {
1856    if (to.IsTagged()) {
1857      LOperand* value = UseRegister(val);
1858      return DefineSameAsFirst(new(zone()) LDummyUse(value));
1859    }
1860    from = Representation::Tagged();
1861  }
1862  if (from.IsTagged()) {
1863    if (to.IsDouble()) {
1864      LOperand* value = UseRegister(val);
1865      LInstruction* result = DefineAsRegister(new(zone()) LNumberUntagD(value));
1866      if (!val->representation().IsSmi()) result = AssignEnvironment(result);
1867      return result;
1868    } else if (to.IsSmi()) {
1869      LOperand* value = UseRegister(val);
1870      if (val->type().IsSmi()) {
1871        return DefineSameAsFirst(new(zone()) LDummyUse(value));
1872      }
1873      return AssignEnvironment(DefineSameAsFirst(new(zone()) LCheckSmi(value)));
1874    } else {
1875      DCHECK(to.IsInteger32());
1876      if (val->type().IsSmi() || val->representation().IsSmi()) {
1877        LOperand* value = UseRegisterAtStart(val);
1878        return DefineAsRegister(new(zone()) LSmiUntag(value, false));
1879      } else {
1880        LOperand* value = UseRegister(val);
1881        LOperand* temp1 = TempRegister();
1882        LOperand* temp2 = TempDoubleRegister();
1883        LInstruction* result =
1884            DefineSameAsFirst(new(zone()) LTaggedToI(value, temp1, temp2));
1885        if (!val->representation().IsSmi()) result = AssignEnvironment(result);
1886        return result;
1887      }
1888    }
1889  } else if (from.IsDouble()) {
1890    if (to.IsTagged()) {
1891      info()->MarkAsDeferredCalling();
1892      LOperand* value = UseRegister(val);
1893      LOperand* temp1 = TempRegister();
1894      LOperand* temp2 = TempRegister();
1895      LUnallocated* result_temp = TempRegister();
1896      LNumberTagD* result = new(zone()) LNumberTagD(value, temp1, temp2);
1897      return AssignPointerMap(Define(result, result_temp));
1898    } else if (to.IsSmi()) {
1899      LOperand* value = UseRegister(val);
1900      return AssignEnvironment(
1901          DefineAsRegister(new(zone()) LDoubleToSmi(value)));
1902    } else {
1903      DCHECK(to.IsInteger32());
1904      LOperand* value = UseRegister(val);
1905      LInstruction* result = DefineAsRegister(new(zone()) LDoubleToI(value));
1906      if (!instr->CanTruncateToInt32()) result = AssignEnvironment(result);
1907      return result;
1908    }
1909  } else if (from.IsInteger32()) {
1910    info()->MarkAsDeferredCalling();
1911    if (to.IsTagged()) {
1912      if (!instr->CheckFlag(HValue::kCanOverflow)) {
1913        LOperand* value = UseRegisterAtStart(val);
1914        return DefineAsRegister(new(zone()) LSmiTag(value));
1915      } else if (val->CheckFlag(HInstruction::kUint32)) {
1916        LOperand* value = UseRegisterAtStart(val);
1917        LOperand* temp1 = TempRegister();
1918        LOperand* temp2 = TempRegister();
1919        LNumberTagU* result = new(zone()) LNumberTagU(value, temp1, temp2);
1920        return AssignPointerMap(DefineAsRegister(result));
1921      } else {
1922        LOperand* value = UseRegisterAtStart(val);
1923        LOperand* temp1 = TempRegister();
1924        LOperand* temp2 = TempRegister();
1925        LNumberTagI* result = new(zone()) LNumberTagI(value, temp1, temp2);
1926        return AssignPointerMap(DefineAsRegister(result));
1927      }
1928    } else if (to.IsSmi()) {
1929      LOperand* value = UseRegister(val);
1930      LInstruction* result = DefineAsRegister(new(zone()) LSmiTag(value));
1931      if (instr->CheckFlag(HValue::kCanOverflow)) {
1932        result = AssignEnvironment(result);
1933      }
1934      return result;
1935    } else {
1936      DCHECK(to.IsDouble());
1937      if (val->CheckFlag(HInstruction::kUint32)) {
1938        return DefineAsRegister(new(zone()) LUint32ToDouble(UseRegister(val)));
1939      } else {
1940        return DefineAsRegister(new(zone()) LInteger32ToDouble(Use(val)));
1941      }
1942    }
1943  }
1944  UNREACHABLE();
1945  return NULL;
1946}
1947
1948
1949LInstruction* LChunkBuilder::DoCheckHeapObject(HCheckHeapObject* instr) {
1950  LOperand* value = UseRegisterAtStart(instr->value());
1951  LInstruction* result = new(zone()) LCheckNonSmi(value);
1952  if (!instr->value()->type().IsHeapObject()) {
1953    result = AssignEnvironment(result);
1954  }
1955  return result;
1956}
1957
1958
1959LInstruction* LChunkBuilder::DoCheckSmi(HCheckSmi* instr) {
1960  LOperand* value = UseRegisterAtStart(instr->value());
1961  return AssignEnvironment(new(zone()) LCheckSmi(value));
1962}
1963
1964
1965LInstruction* LChunkBuilder::DoCheckInstanceType(HCheckInstanceType* instr) {
1966  LOperand* value = UseRegisterAtStart(instr->value());
1967  LInstruction* result = new(zone()) LCheckInstanceType(value);
1968  return AssignEnvironment(result);
1969}
1970
1971
1972LInstruction* LChunkBuilder::DoCheckValue(HCheckValue* instr) {
1973  LOperand* value = UseRegisterAtStart(instr->value());
1974  return AssignEnvironment(new(zone()) LCheckValue(value));
1975}
1976
1977
1978LInstruction* LChunkBuilder::DoCheckMaps(HCheckMaps* instr) {
1979  if (instr->IsStabilityCheck()) return new(zone()) LCheckMaps;
1980  LOperand* value = UseRegisterAtStart(instr->value());
1981  LInstruction* result = AssignEnvironment(new(zone()) LCheckMaps(value));
1982  if (instr->HasMigrationTarget()) {
1983    info()->MarkAsDeferredCalling();
1984    result = AssignPointerMap(result);
1985  }
1986  return result;
1987}
1988
1989
1990LInstruction* LChunkBuilder::DoClampToUint8(HClampToUint8* instr) {
1991  HValue* value = instr->value();
1992  Representation input_rep = value->representation();
1993  LOperand* reg = UseRegister(value);
1994  if (input_rep.IsDouble()) {
1995    // Revisit this decision, here and 8 lines below.
1996    return DefineAsRegister(new(zone()) LClampDToUint8(reg,
1997        TempDoubleRegister()));
1998  } else if (input_rep.IsInteger32()) {
1999    return DefineAsRegister(new(zone()) LClampIToUint8(reg));
2000  } else {
2001    DCHECK(input_rep.IsSmiOrTagged());
2002    LClampTToUint8* result =
2003        new(zone()) LClampTToUint8(reg, TempDoubleRegister());
2004    return AssignEnvironment(DefineAsRegister(result));
2005  }
2006}
2007
2008
2009LInstruction* LChunkBuilder::DoDoubleBits(HDoubleBits* instr) {
2010  HValue* value = instr->value();
2011  DCHECK(value->representation().IsDouble());
2012  return DefineAsRegister(new(zone()) LDoubleBits(UseRegister(value)));
2013}
2014
2015
2016LInstruction* LChunkBuilder::DoConstructDouble(HConstructDouble* instr) {
2017  LOperand* lo = UseRegister(instr->lo());
2018  LOperand* hi = UseRegister(instr->hi());
2019  return DefineAsRegister(new(zone()) LConstructDouble(hi, lo));
2020}
2021
2022
2023LInstruction* LChunkBuilder::DoReturn(HReturn* instr) {
2024  LOperand* context = info()->IsStub()
2025      ? UseFixed(instr->context(), cp)
2026      : NULL;
2027  LOperand* parameter_count = UseRegisterOrConstant(instr->parameter_count());
2028  return new(zone()) LReturn(UseFixed(instr->value(), v0), context,
2029                             parameter_count);
2030}
2031
2032
2033LInstruction* LChunkBuilder::DoConstant(HConstant* instr) {
2034  Representation r = instr->representation();
2035  if (r.IsSmi()) {
2036    return DefineAsRegister(new(zone()) LConstantS);
2037  } else if (r.IsInteger32()) {
2038    return DefineAsRegister(new(zone()) LConstantI);
2039  } else if (r.IsDouble()) {
2040    return DefineAsRegister(new(zone()) LConstantD);
2041  } else if (r.IsExternal()) {
2042    return DefineAsRegister(new(zone()) LConstantE);
2043  } else if (r.IsTagged()) {
2044    return DefineAsRegister(new(zone()) LConstantT);
2045  } else {
2046    UNREACHABLE();
2047    return NULL;
2048  }
2049}
2050
2051
2052LInstruction* LChunkBuilder::DoLoadGlobalCell(HLoadGlobalCell* instr) {
2053  LLoadGlobalCell* result = new(zone()) LLoadGlobalCell;
2054  return instr->RequiresHoleCheck()
2055      ? AssignEnvironment(DefineAsRegister(result))
2056      : DefineAsRegister(result);
2057}
2058
2059
2060LInstruction* LChunkBuilder::DoLoadGlobalGeneric(HLoadGlobalGeneric* instr) {
2061  LOperand* context = UseFixed(instr->context(), cp);
2062  LOperand* global_object =
2063      UseFixed(instr->global_object(), LoadDescriptor::ReceiverRegister());
2064  LOperand* vector = NULL;
2065  if (FLAG_vector_ics) {
2066    vector = FixedTemp(VectorLoadICDescriptor::VectorRegister());
2067  }
2068  LLoadGlobalGeneric* result =
2069      new(zone()) LLoadGlobalGeneric(context, global_object, vector);
2070  return MarkAsCall(DefineFixed(result, v0), instr);
2071}
2072
2073
2074LInstruction* LChunkBuilder::DoStoreGlobalCell(HStoreGlobalCell* instr) {
2075  LOperand* value = UseRegister(instr->value());
2076  // Use a temp to check the value in the cell in the case where we perform
2077  // a hole check.
2078  return instr->RequiresHoleCheck()
2079      ? AssignEnvironment(new(zone()) LStoreGlobalCell(value, TempRegister()))
2080      : new(zone()) LStoreGlobalCell(value, NULL);
2081}
2082
2083
2084LInstruction* LChunkBuilder::DoLoadContextSlot(HLoadContextSlot* instr) {
2085  LOperand* context = UseRegisterAtStart(instr->value());
2086  LInstruction* result =
2087      DefineAsRegister(new(zone()) LLoadContextSlot(context));
2088  if (instr->RequiresHoleCheck() && instr->DeoptimizesOnHole()) {
2089    result = AssignEnvironment(result);
2090  }
2091  return result;
2092}
2093
2094
2095LInstruction* LChunkBuilder::DoStoreContextSlot(HStoreContextSlot* instr) {
2096  LOperand* context;
2097  LOperand* value;
2098  if (instr->NeedsWriteBarrier()) {
2099    context = UseTempRegister(instr->context());
2100    value = UseTempRegister(instr->value());
2101  } else {
2102    context = UseRegister(instr->context());
2103    value = UseRegister(instr->value());
2104  }
2105  LInstruction* result = new(zone()) LStoreContextSlot(context, value);
2106  if (instr->RequiresHoleCheck() && instr->DeoptimizesOnHole()) {
2107    result = AssignEnvironment(result);
2108  }
2109  return result;
2110}
2111
2112
2113LInstruction* LChunkBuilder::DoLoadNamedField(HLoadNamedField* instr) {
2114  LOperand* obj = UseRegisterAtStart(instr->object());
2115  return DefineAsRegister(new(zone()) LLoadNamedField(obj));
2116}
2117
2118
2119LInstruction* LChunkBuilder::DoLoadNamedGeneric(HLoadNamedGeneric* instr) {
2120  LOperand* context = UseFixed(instr->context(), cp);
2121  LOperand* object =
2122      UseFixed(instr->object(), LoadDescriptor::ReceiverRegister());
2123  LOperand* vector = NULL;
2124  if (FLAG_vector_ics) {
2125    vector = FixedTemp(VectorLoadICDescriptor::VectorRegister());
2126  }
2127
2128  LInstruction* result =
2129      DefineFixed(new(zone()) LLoadNamedGeneric(context, object, vector), v0);
2130  return MarkAsCall(result, instr);
2131}
2132
2133
2134LInstruction* LChunkBuilder::DoLoadFunctionPrototype(
2135    HLoadFunctionPrototype* instr) {
2136  return AssignEnvironment(DefineAsRegister(
2137      new(zone()) LLoadFunctionPrototype(UseRegister(instr->function()))));
2138}
2139
2140
2141LInstruction* LChunkBuilder::DoLoadRoot(HLoadRoot* instr) {
2142  return DefineAsRegister(new(zone()) LLoadRoot);
2143}
2144
2145
2146LInstruction* LChunkBuilder::DoLoadKeyed(HLoadKeyed* instr) {
2147  DCHECK(instr->key()->representation().IsSmiOrInteger32());
2148  ElementsKind elements_kind = instr->elements_kind();
2149  LOperand* key = UseRegisterOrConstantAtStart(instr->key());
2150  LInstruction* result = NULL;
2151
2152  if (!instr->is_typed_elements()) {
2153    LOperand* obj = NULL;
2154    if (instr->representation().IsDouble()) {
2155      obj = UseRegister(instr->elements());
2156    } else {
2157      DCHECK(instr->representation().IsSmiOrTagged());
2158      obj = UseRegisterAtStart(instr->elements());
2159    }
2160    result = DefineAsRegister(new(zone()) LLoadKeyed(obj, key));
2161  } else {
2162    DCHECK(
2163        (instr->representation().IsInteger32() &&
2164         !IsDoubleOrFloatElementsKind(elements_kind)) ||
2165        (instr->representation().IsDouble() &&
2166         IsDoubleOrFloatElementsKind(elements_kind)));
2167    LOperand* backing_store = UseRegister(instr->elements());
2168    result = DefineAsRegister(new(zone()) LLoadKeyed(backing_store, key));
2169  }
2170
2171  if ((instr->is_external() || instr->is_fixed_typed_array()) ?
2172      // see LCodeGen::DoLoadKeyedExternalArray
2173      ((elements_kind == EXTERNAL_UINT32_ELEMENTS ||
2174        elements_kind == UINT32_ELEMENTS) &&
2175       !instr->CheckFlag(HInstruction::kUint32)) :
2176      // see LCodeGen::DoLoadKeyedFixedDoubleArray and
2177      // LCodeGen::DoLoadKeyedFixedArray
2178      instr->RequiresHoleCheck()) {
2179    result = AssignEnvironment(result);
2180  }
2181  return result;
2182}
2183
2184
2185LInstruction* LChunkBuilder::DoLoadKeyedGeneric(HLoadKeyedGeneric* instr) {
2186  LOperand* context = UseFixed(instr->context(), cp);
2187  LOperand* object =
2188      UseFixed(instr->object(), LoadDescriptor::ReceiverRegister());
2189  LOperand* key = UseFixed(instr->key(), LoadDescriptor::NameRegister());
2190  LOperand* vector = NULL;
2191  if (FLAG_vector_ics) {
2192    vector = FixedTemp(VectorLoadICDescriptor::VectorRegister());
2193  }
2194
2195  LInstruction* result =
2196      DefineFixed(new(zone()) LLoadKeyedGeneric(context, object, key, vector),
2197                  v0);
2198  return MarkAsCall(result, instr);
2199}
2200
2201
2202LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
2203  if (!instr->is_typed_elements()) {
2204    DCHECK(instr->elements()->representation().IsTagged());
2205    bool needs_write_barrier = instr->NeedsWriteBarrier();
2206    LOperand* object = NULL;
2207    LOperand* val = NULL;
2208    LOperand* key = NULL;
2209
2210    if (instr->value()->representation().IsDouble()) {
2211      object = UseRegisterAtStart(instr->elements());
2212      key = UseRegisterOrConstantAtStart(instr->key());
2213      val = UseRegister(instr->value());
2214    } else {
2215      DCHECK(instr->value()->representation().IsSmiOrTagged());
2216      if (needs_write_barrier) {
2217        object = UseTempRegister(instr->elements());
2218        val = UseTempRegister(instr->value());
2219        key = UseTempRegister(instr->key());
2220      } else {
2221        object = UseRegisterAtStart(instr->elements());
2222        val = UseRegisterAtStart(instr->value());
2223        key = UseRegisterOrConstantAtStart(instr->key());
2224      }
2225    }
2226
2227    return new(zone()) LStoreKeyed(object, key, val);
2228  }
2229
2230  DCHECK(
2231      (instr->value()->representation().IsInteger32() &&
2232       !IsDoubleOrFloatElementsKind(instr->elements_kind())) ||
2233      (instr->value()->representation().IsDouble() &&
2234       IsDoubleOrFloatElementsKind(instr->elements_kind())));
2235  DCHECK((instr->is_fixed_typed_array() &&
2236          instr->elements()->representation().IsTagged()) ||
2237         (instr->is_external() &&
2238          instr->elements()->representation().IsExternal()));
2239  LOperand* val = UseRegister(instr->value());
2240  LOperand* key = UseRegisterOrConstantAtStart(instr->key());
2241  LOperand* backing_store = UseRegister(instr->elements());
2242  return new(zone()) LStoreKeyed(backing_store, key, val);
2243}
2244
2245
2246LInstruction* LChunkBuilder::DoStoreKeyedGeneric(HStoreKeyedGeneric* instr) {
2247  LOperand* context = UseFixed(instr->context(), cp);
2248  LOperand* obj =
2249      UseFixed(instr->object(), StoreDescriptor::ReceiverRegister());
2250  LOperand* key = UseFixed(instr->key(), StoreDescriptor::NameRegister());
2251  LOperand* val = UseFixed(instr->value(), StoreDescriptor::ValueRegister());
2252
2253  DCHECK(instr->object()->representation().IsTagged());
2254  DCHECK(instr->key()->representation().IsTagged());
2255  DCHECK(instr->value()->representation().IsTagged());
2256
2257  return MarkAsCall(
2258      new(zone()) LStoreKeyedGeneric(context, obj, key, val), instr);
2259}
2260
2261
2262LInstruction* LChunkBuilder::DoTransitionElementsKind(
2263    HTransitionElementsKind* instr) {
2264  if (IsSimpleMapChangeTransition(instr->from_kind(), instr->to_kind())) {
2265    LOperand* object = UseRegister(instr->object());
2266    LOperand* new_map_reg = TempRegister();
2267    LTransitionElementsKind* result =
2268        new(zone()) LTransitionElementsKind(object, NULL, new_map_reg);
2269    return result;
2270  } else {
2271    LOperand* object = UseFixed(instr->object(), a0);
2272    LOperand* context = UseFixed(instr->context(), cp);
2273    LTransitionElementsKind* result =
2274        new(zone()) LTransitionElementsKind(object, context, NULL);
2275    return MarkAsCall(result, instr);
2276  }
2277}
2278
2279
2280LInstruction* LChunkBuilder::DoTrapAllocationMemento(
2281    HTrapAllocationMemento* instr) {
2282  LOperand* object = UseRegister(instr->object());
2283  LOperand* temp = TempRegister();
2284  LTrapAllocationMemento* result =
2285      new(zone()) LTrapAllocationMemento(object, temp);
2286  return AssignEnvironment(result);
2287}
2288
2289
2290LInstruction* LChunkBuilder::DoStoreNamedField(HStoreNamedField* instr) {
2291  bool is_in_object = instr->access().IsInobject();
2292  bool needs_write_barrier = instr->NeedsWriteBarrier();
2293  bool needs_write_barrier_for_map = instr->has_transition() &&
2294      instr->NeedsWriteBarrierForMap();
2295
2296  LOperand* obj;
2297  if (needs_write_barrier) {
2298    obj = is_in_object
2299        ? UseRegister(instr->object())
2300        : UseTempRegister(instr->object());
2301  } else {
2302    obj = needs_write_barrier_for_map
2303        ? UseRegister(instr->object())
2304        : UseRegisterAtStart(instr->object());
2305  }
2306
2307  LOperand* val;
2308  if (needs_write_barrier) {
2309    val = UseTempRegister(instr->value());
2310  } else if (instr->field_representation().IsDouble()) {
2311    val = UseRegisterAtStart(instr->value());
2312  } else {
2313    val = UseRegister(instr->value());
2314  }
2315
2316  // We need a temporary register for write barrier of the map field.
2317  LOperand* temp = needs_write_barrier_for_map ? TempRegister() : NULL;
2318
2319  return new(zone()) LStoreNamedField(obj, val, temp);
2320}
2321
2322
2323LInstruction* LChunkBuilder::DoStoreNamedGeneric(HStoreNamedGeneric* instr) {
2324  LOperand* context = UseFixed(instr->context(), cp);
2325  LOperand* obj =
2326      UseFixed(instr->object(), StoreDescriptor::ReceiverRegister());
2327  LOperand* val = UseFixed(instr->value(), StoreDescriptor::ValueRegister());
2328
2329  LInstruction* result = new(zone()) LStoreNamedGeneric(context, obj, val);
2330  return MarkAsCall(result, instr);
2331}
2332
2333
2334LInstruction* LChunkBuilder::DoStringAdd(HStringAdd* instr) {
2335  LOperand* context = UseFixed(instr->context(), cp);
2336  LOperand* left = UseFixed(instr->left(), a1);
2337  LOperand* right = UseFixed(instr->right(), a0);
2338  return MarkAsCall(
2339      DefineFixed(new(zone()) LStringAdd(context, left, right), v0),
2340      instr);
2341}
2342
2343
2344LInstruction* LChunkBuilder::DoStringCharCodeAt(HStringCharCodeAt* instr) {
2345  LOperand* string = UseTempRegister(instr->string());
2346  LOperand* index = UseTempRegister(instr->index());
2347  LOperand* context = UseAny(instr->context());
2348  LStringCharCodeAt* result =
2349      new(zone()) LStringCharCodeAt(context, string, index);
2350  return AssignPointerMap(DefineAsRegister(result));
2351}
2352
2353
2354LInstruction* LChunkBuilder::DoStringCharFromCode(HStringCharFromCode* instr) {
2355  LOperand* char_code = UseRegister(instr->value());
2356  LOperand* context = UseAny(instr->context());
2357  LStringCharFromCode* result =
2358      new(zone()) LStringCharFromCode(context, char_code);
2359  return AssignPointerMap(DefineAsRegister(result));
2360}
2361
2362
2363LInstruction* LChunkBuilder::DoAllocate(HAllocate* instr) {
2364  info()->MarkAsDeferredCalling();
2365  LOperand* context = UseAny(instr->context());
2366  LOperand* size = UseRegisterOrConstant(instr->size());
2367  LOperand* temp1 = TempRegister();
2368  LOperand* temp2 = TempRegister();
2369  LAllocate* result = new(zone()) LAllocate(context, size, temp1, temp2);
2370  return AssignPointerMap(DefineAsRegister(result));
2371}
2372
2373
2374LInstruction* LChunkBuilder::DoRegExpLiteral(HRegExpLiteral* instr) {
2375  LOperand* context = UseFixed(instr->context(), cp);
2376  return MarkAsCall(
2377      DefineFixed(new(zone()) LRegExpLiteral(context), v0), instr);
2378}
2379
2380
2381LInstruction* LChunkBuilder::DoFunctionLiteral(HFunctionLiteral* instr) {
2382  LOperand* context = UseFixed(instr->context(), cp);
2383  return MarkAsCall(
2384      DefineFixed(new(zone()) LFunctionLiteral(context), v0), instr);
2385}
2386
2387
2388LInstruction* LChunkBuilder::DoOsrEntry(HOsrEntry* instr) {
2389  DCHECK(argument_count_ == 0);
2390  allocator_->MarkAsOsrEntry();
2391  current_block_->last_environment()->set_ast_id(instr->ast_id());
2392  return AssignEnvironment(new(zone()) LOsrEntry);
2393}
2394
2395
2396LInstruction* LChunkBuilder::DoParameter(HParameter* instr) {
2397  LParameter* result = new(zone()) LParameter;
2398  if (instr->kind() == HParameter::STACK_PARAMETER) {
2399    int spill_index = chunk()->GetParameterStackSlot(instr->index());
2400    return DefineAsSpilled(result, spill_index);
2401  } else {
2402    DCHECK(info()->IsStub());
2403    CallInterfaceDescriptor descriptor =
2404        info()->code_stub()->GetCallInterfaceDescriptor();
2405    int index = static_cast<int>(instr->index());
2406    Register reg = descriptor.GetEnvironmentParameterRegister(index);
2407    return DefineFixed(result, reg);
2408  }
2409}
2410
2411
2412LInstruction* LChunkBuilder::DoUnknownOSRValue(HUnknownOSRValue* instr) {
2413  // Use an index that corresponds to the location in the unoptimized frame,
2414  // which the optimized frame will subsume.
2415  int env_index = instr->index();
2416  int spill_index = 0;
2417  if (instr->environment()->is_parameter_index(env_index)) {
2418    spill_index = chunk()->GetParameterStackSlot(env_index);
2419  } else {
2420    spill_index = env_index - instr->environment()->first_local_index();
2421    if (spill_index > LUnallocated::kMaxFixedSlotIndex) {
2422      Retry(kTooManySpillSlotsNeededForOSR);
2423      spill_index = 0;
2424    }
2425  }
2426  return DefineAsSpilled(new(zone()) LUnknownOSRValue, spill_index);
2427}
2428
2429
2430LInstruction* LChunkBuilder::DoCallStub(HCallStub* instr) {
2431  LOperand* context = UseFixed(instr->context(), cp);
2432  return MarkAsCall(DefineFixed(new(zone()) LCallStub(context), v0), instr);
2433}
2434
2435
2436LInstruction* LChunkBuilder::DoArgumentsObject(HArgumentsObject* instr) {
2437  // There are no real uses of the arguments object.
2438  // arguments.length and element access are supported directly on
2439  // stack arguments, and any real arguments object use causes a bailout.
2440  // So this value is never used.
2441  return NULL;
2442}
2443
2444
2445LInstruction* LChunkBuilder::DoCapturedObject(HCapturedObject* instr) {
2446  instr->ReplayEnvironment(current_block_->last_environment());
2447
2448  // There are no real uses of a captured object.
2449  return NULL;
2450}
2451
2452
2453LInstruction* LChunkBuilder::DoAccessArgumentsAt(HAccessArgumentsAt* instr) {
2454  info()->MarkAsRequiresFrame();
2455  LOperand* args = UseRegister(instr->arguments());
2456  LOperand* length = UseRegisterOrConstantAtStart(instr->length());
2457  LOperand* index = UseRegisterOrConstantAtStart(instr->index());
2458  return DefineAsRegister(new(zone()) LAccessArgumentsAt(args, length, index));
2459}
2460
2461
2462LInstruction* LChunkBuilder::DoToFastProperties(HToFastProperties* instr) {
2463  LOperand* object = UseFixed(instr->value(), a0);
2464  LToFastProperties* result = new(zone()) LToFastProperties(object);
2465  return MarkAsCall(DefineFixed(result, v0), instr);
2466}
2467
2468
2469LInstruction* LChunkBuilder::DoTypeof(HTypeof* instr) {
2470  LOperand* context = UseFixed(instr->context(), cp);
2471  LTypeof* result = new(zone()) LTypeof(context, UseFixed(instr->value(), a0));
2472  return MarkAsCall(DefineFixed(result, v0), instr);
2473}
2474
2475
2476LInstruction* LChunkBuilder::DoTypeofIsAndBranch(HTypeofIsAndBranch* instr) {
2477  return new(zone()) LTypeofIsAndBranch(UseTempRegister(instr->value()));
2478}
2479
2480
2481LInstruction* LChunkBuilder::DoIsConstructCallAndBranch(
2482    HIsConstructCallAndBranch* instr) {
2483  return new(zone()) LIsConstructCallAndBranch(TempRegister());
2484}
2485
2486
2487LInstruction* LChunkBuilder::DoSimulate(HSimulate* instr) {
2488  instr->ReplayEnvironment(current_block_->last_environment());
2489  return NULL;
2490}
2491
2492
2493LInstruction* LChunkBuilder::DoStackCheck(HStackCheck* instr) {
2494  if (instr->is_function_entry()) {
2495    LOperand* context = UseFixed(instr->context(), cp);
2496    return MarkAsCall(new(zone()) LStackCheck(context), instr);
2497  } else {
2498    DCHECK(instr->is_backwards_branch());
2499    LOperand* context = UseAny(instr->context());
2500    return AssignEnvironment(
2501        AssignPointerMap(new(zone()) LStackCheck(context)));
2502  }
2503}
2504
2505
2506LInstruction* LChunkBuilder::DoEnterInlined(HEnterInlined* instr) {
2507  HEnvironment* outer = current_block_->last_environment();
2508  outer->set_ast_id(instr->ReturnId());
2509  HConstant* undefined = graph()->GetConstantUndefined();
2510  HEnvironment* inner = outer->CopyForInlining(instr->closure(),
2511                                               instr->arguments_count(),
2512                                               instr->function(),
2513                                               undefined,
2514                                               instr->inlining_kind());
2515  // Only replay binding of arguments object if it wasn't removed from graph.
2516  if (instr->arguments_var() != NULL && instr->arguments_object()->IsLinked()) {
2517    inner->Bind(instr->arguments_var(), instr->arguments_object());
2518  }
2519  inner->BindContext(instr->closure_context());
2520  inner->set_entry(instr);
2521  current_block_->UpdateEnvironment(inner);
2522  chunk_->AddInlinedClosure(instr->closure());
2523  return NULL;
2524}
2525
2526
2527LInstruction* LChunkBuilder::DoLeaveInlined(HLeaveInlined* instr) {
2528  LInstruction* pop = NULL;
2529
2530  HEnvironment* env = current_block_->last_environment();
2531
2532  if (env->entry()->arguments_pushed()) {
2533    int argument_count = env->arguments_environment()->parameter_count();
2534    pop = new(zone()) LDrop(argument_count);
2535    DCHECK(instr->argument_delta() == -argument_count);
2536  }
2537
2538  HEnvironment* outer = current_block_->last_environment()->
2539      DiscardInlined(false);
2540  current_block_->UpdateEnvironment(outer);
2541
2542  return pop;
2543}
2544
2545
2546LInstruction* LChunkBuilder::DoForInPrepareMap(HForInPrepareMap* instr) {
2547  LOperand* context = UseFixed(instr->context(), cp);
2548  LOperand* object = UseFixed(instr->enumerable(), a0);
2549  LForInPrepareMap* result = new(zone()) LForInPrepareMap(context, object);
2550  return MarkAsCall(DefineFixed(result, v0), instr, CAN_DEOPTIMIZE_EAGERLY);
2551}
2552
2553
2554LInstruction* LChunkBuilder::DoForInCacheArray(HForInCacheArray* instr) {
2555  LOperand* map = UseRegister(instr->map());
2556  return AssignEnvironment(DefineAsRegister(new(zone()) LForInCacheArray(map)));
2557}
2558
2559
2560LInstruction* LChunkBuilder::DoCheckMapValue(HCheckMapValue* instr) {
2561  LOperand* value = UseRegisterAtStart(instr->value());
2562  LOperand* map = UseRegisterAtStart(instr->map());
2563  return AssignEnvironment(new(zone()) LCheckMapValue(value, map));
2564}
2565
2566
2567LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
2568  LOperand* object = UseRegister(instr->object());
2569  LOperand* index = UseTempRegister(instr->index());
2570  LLoadFieldByIndex* load = new(zone()) LLoadFieldByIndex(object, index);
2571  LInstruction* result = DefineSameAsFirst(load);
2572  return AssignPointerMap(result);
2573}
2574
2575
2576
2577LInstruction* LChunkBuilder::DoStoreFrameContext(HStoreFrameContext* instr) {
2578  LOperand* context = UseRegisterAtStart(instr->context());
2579  return new(zone()) LStoreFrameContext(context);
2580}
2581
2582
2583LInstruction* LChunkBuilder::DoAllocateBlockContext(
2584    HAllocateBlockContext* instr) {
2585  LOperand* context = UseFixed(instr->context(), cp);
2586  LOperand* function = UseRegisterAtStart(instr->function());
2587  LAllocateBlockContext* result =
2588      new(zone()) LAllocateBlockContext(context, function);
2589  return MarkAsCall(DefineFixed(result, cp), instr);
2590}
2591
2592} }  // namespace v8::internal
2593
2594#endif  // V8_TARGET_ARCH_MIPS
2595