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      1 // Copyright 2012 the V8 project authors. All rights reserved.
      2 // Redistribution and use in source and binary forms, with or without
      3 // modification, are permitted provided that the following conditions are
      4 // met:
      5 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 #include "v8.h"
     29 
     30 #include "lithium-allocator-inl.h"
     31 #include "arm/lithium-arm.h"
     32 #include "arm/lithium-codegen-arm.h"
     33 
     34 namespace v8 {
     35 namespace internal {
     36 
     37 #define DEFINE_COMPILE(type)                            \
     38   void L##type::CompileToNative(LCodeGen* generator) {  \
     39     generator->Do##type(this);                          \
     40   }
     41 LITHIUM_CONCRETE_INSTRUCTION_LIST(DEFINE_COMPILE)
     42 #undef DEFINE_COMPILE
     43 
     44 LOsrEntry::LOsrEntry() {
     45   for (int i = 0; i < Register::kNumAllocatableRegisters; ++i) {
     46     register_spills_[i] = NULL;
     47   }
     48   for (int i = 0; i < DoubleRegister::kNumAllocatableRegisters; ++i) {
     49     double_register_spills_[i] = NULL;
     50   }
     51 }
     52 
     53 
     54 void LOsrEntry::MarkSpilledRegister(int allocation_index,
     55                                     LOperand* spill_operand) {
     56   ASSERT(spill_operand->IsStackSlot());
     57   ASSERT(register_spills_[allocation_index] == NULL);
     58   register_spills_[allocation_index] = spill_operand;
     59 }
     60 
     61 
     62 #ifdef DEBUG
     63 void LInstruction::VerifyCall() {
     64   // Call instructions can use only fixed registers as temporaries and
     65   // outputs because all registers are blocked by the calling convention.
     66   // Inputs operands must use a fixed register or use-at-start policy or
     67   // a non-register policy.
     68   ASSERT(Output() == NULL ||
     69          LUnallocated::cast(Output())->HasFixedPolicy() ||
     70          !LUnallocated::cast(Output())->HasRegisterPolicy());
     71   for (UseIterator it(this); !it.Done(); it.Advance()) {
     72     LUnallocated* operand = LUnallocated::cast(it.Current());
     73     ASSERT(operand->HasFixedPolicy() ||
     74            operand->IsUsedAtStart());
     75   }
     76   for (TempIterator it(this); !it.Done(); it.Advance()) {
     77     LUnallocated* operand = LUnallocated::cast(it.Current());
     78     ASSERT(operand->HasFixedPolicy() ||!operand->HasRegisterPolicy());
     79   }
     80 }
     81 #endif
     82 
     83 
     84 void LOsrEntry::MarkSpilledDoubleRegister(int allocation_index,
     85                                           LOperand* spill_operand) {
     86   ASSERT(spill_operand->IsDoubleStackSlot());
     87   ASSERT(double_register_spills_[allocation_index] == NULL);
     88   double_register_spills_[allocation_index] = spill_operand;
     89 }
     90 
     91 
     92 void LInstruction::PrintTo(StringStream* stream) {
     93   stream->Add("%s ", this->Mnemonic());
     94 
     95   PrintOutputOperandTo(stream);
     96 
     97   PrintDataTo(stream);
     98 
     99   if (HasEnvironment()) {
    100     stream->Add(" ");
    101     environment()->PrintTo(stream);
    102   }
    103 
    104   if (HasPointerMap()) {
    105     stream->Add(" ");
    106     pointer_map()->PrintTo(stream);
    107   }
    108 }
    109 
    110 
    111 template<int R, int I, int T>
    112 void LTemplateInstruction<R, I, T>::PrintDataTo(StringStream* stream) {
    113   stream->Add("= ");
    114   for (int i = 0; i < inputs_.length(); i++) {
    115     if (i > 0) stream->Add(" ");
    116     inputs_[i]->PrintTo(stream);
    117   }
    118 }
    119 
    120 
    121 template<int R, int I, int T>
    122 void LTemplateInstruction<R, I, T>::PrintOutputOperandTo(StringStream* stream) {
    123   for (int i = 0; i < results_.length(); i++) {
    124     if (i > 0) stream->Add(" ");
    125     results_[i]->PrintTo(stream);
    126   }
    127 }
    128 
    129 
    130 void LLabel::PrintDataTo(StringStream* stream) {
    131   LGap::PrintDataTo(stream);
    132   LLabel* rep = replacement();
    133   if (rep != NULL) {
    134     stream->Add(" Dead block replaced with B%d", rep->block_id());
    135   }
    136 }
    137 
    138 
    139 bool LGap::IsRedundant() const {
    140   for (int i = 0; i < 4; i++) {
    141     if (parallel_moves_[i] != NULL && !parallel_moves_[i]->IsRedundant()) {
    142       return false;
    143     }
    144   }
    145 
    146   return true;
    147 }
    148 
    149 
    150 void LGap::PrintDataTo(StringStream* stream) {
    151   for (int i = 0; i < 4; i++) {
    152     stream->Add("(");
    153     if (parallel_moves_[i] != NULL) {
    154       parallel_moves_[i]->PrintDataTo(stream);
    155     }
    156     stream->Add(") ");
    157   }
    158 }
    159 
    160 
    161 const char* LArithmeticD::Mnemonic() const {
    162   switch (op()) {
    163     case Token::ADD: return "add-d";
    164     case Token::SUB: return "sub-d";
    165     case Token::MUL: return "mul-d";
    166     case Token::DIV: return "div-d";
    167     case Token::MOD: return "mod-d";
    168     default:
    169       UNREACHABLE();
    170       return NULL;
    171   }
    172 }
    173 
    174 
    175 const char* LArithmeticT::Mnemonic() const {
    176   switch (op()) {
    177     case Token::ADD: return "add-t";
    178     case Token::SUB: return "sub-t";
    179     case Token::MUL: return "mul-t";
    180     case Token::MOD: return "mod-t";
    181     case Token::DIV: return "div-t";
    182     case Token::BIT_AND: return "bit-and-t";
    183     case Token::BIT_OR: return "bit-or-t";
    184     case Token::BIT_XOR: return "bit-xor-t";
    185     case Token::SHL: return "shl-t";
    186     case Token::SAR: return "sar-t";
    187     case Token::SHR: return "shr-t";
    188     default:
    189       UNREACHABLE();
    190       return NULL;
    191   }
    192 }
    193 
    194 
    195 void LGoto::PrintDataTo(StringStream* stream) {
    196   stream->Add("B%d", block_id());
    197 }
    198 
    199 
    200 void LBranch::PrintDataTo(StringStream* stream) {
    201   stream->Add("B%d | B%d on ", true_block_id(), false_block_id());
    202   InputAt(0)->PrintTo(stream);
    203 }
    204 
    205 
    206 void LCmpIDAndBranch::PrintDataTo(StringStream* stream) {
    207   stream->Add("if ");
    208   InputAt(0)->PrintTo(stream);
    209   stream->Add(" %s ", Token::String(op()));
    210   InputAt(1)->PrintTo(stream);
    211   stream->Add(" then B%d else B%d", true_block_id(), false_block_id());
    212 }
    213 
    214 
    215 void LIsNilAndBranch::PrintDataTo(StringStream* stream) {
    216   stream->Add("if ");
    217   InputAt(0)->PrintTo(stream);
    218   stream->Add(kind() == kStrictEquality ? " === " : " == ");
    219   stream->Add(nil() == kNullValue ? "null" : "undefined");
    220   stream->Add(" then B%d else B%d", true_block_id(), false_block_id());
    221 }
    222 
    223 
    224 void LIsObjectAndBranch::PrintDataTo(StringStream* stream) {
    225   stream->Add("if is_object(");
    226   InputAt(0)->PrintTo(stream);
    227   stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
    228 }
    229 
    230 
    231 void LIsStringAndBranch::PrintDataTo(StringStream* stream) {
    232   stream->Add("if is_string(");
    233   InputAt(0)->PrintTo(stream);
    234   stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
    235 }
    236 
    237 
    238 void LIsSmiAndBranch::PrintDataTo(StringStream* stream) {
    239   stream->Add("if is_smi(");
    240   InputAt(0)->PrintTo(stream);
    241   stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
    242 }
    243 
    244 
    245 void LIsUndetectableAndBranch::PrintDataTo(StringStream* stream) {
    246   stream->Add("if is_undetectable(");
    247   InputAt(0)->PrintTo(stream);
    248   stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
    249 }
    250 
    251 
    252 void LStringCompareAndBranch::PrintDataTo(StringStream* stream) {
    253   stream->Add("if string_compare(");
    254   InputAt(0)->PrintTo(stream);
    255   InputAt(1)->PrintTo(stream);
    256   stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
    257 }
    258 
    259 
    260 void LHasInstanceTypeAndBranch::PrintDataTo(StringStream* stream) {
    261   stream->Add("if has_instance_type(");
    262   InputAt(0)->PrintTo(stream);
    263   stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
    264 }
    265 
    266 
    267 void LHasCachedArrayIndexAndBranch::PrintDataTo(StringStream* stream) {
    268   stream->Add("if has_cached_array_index(");
    269   InputAt(0)->PrintTo(stream);
    270   stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
    271 }
    272 
    273 
    274 void LClassOfTestAndBranch::PrintDataTo(StringStream* stream) {
    275   stream->Add("if class_of_test(");
    276   InputAt(0)->PrintTo(stream);
    277   stream->Add(", \"%o\") then B%d else B%d",
    278               *hydrogen()->class_name(),
    279               true_block_id(),
    280               false_block_id());
    281 }
    282 
    283 
    284 void LTypeofIsAndBranch::PrintDataTo(StringStream* stream) {
    285   stream->Add("if typeof ");
    286   InputAt(0)->PrintTo(stream);
    287   stream->Add(" == \"%s\" then B%d else B%d",
    288               *hydrogen()->type_literal()->ToCString(),
    289               true_block_id(), false_block_id());
    290 }
    291 
    292 
    293 void LCallConstantFunction::PrintDataTo(StringStream* stream) {
    294   stream->Add("#%d / ", arity());
    295 }
    296 
    297 
    298 void LUnaryMathOperation::PrintDataTo(StringStream* stream) {
    299   stream->Add("/%s ", hydrogen()->OpName());
    300   InputAt(0)->PrintTo(stream);
    301 }
    302 
    303 
    304 void LLoadContextSlot::PrintDataTo(StringStream* stream) {
    305   InputAt(0)->PrintTo(stream);
    306   stream->Add("[%d]", slot_index());
    307 }
    308 
    309 
    310 void LStoreContextSlot::PrintDataTo(StringStream* stream) {
    311   InputAt(0)->PrintTo(stream);
    312   stream->Add("[%d] <- ", slot_index());
    313   InputAt(1)->PrintTo(stream);
    314 }
    315 
    316 
    317 void LInvokeFunction::PrintDataTo(StringStream* stream) {
    318   stream->Add("= ");
    319   InputAt(0)->PrintTo(stream);
    320   stream->Add(" #%d / ", arity());
    321 }
    322 
    323 
    324 void LCallKeyed::PrintDataTo(StringStream* stream) {
    325   stream->Add("[r2] #%d / ", arity());
    326 }
    327 
    328 
    329 void LCallNamed::PrintDataTo(StringStream* stream) {
    330   SmartArrayPointer<char> name_string = name()->ToCString();
    331   stream->Add("%s #%d / ", *name_string, arity());
    332 }
    333 
    334 
    335 void LCallGlobal::PrintDataTo(StringStream* stream) {
    336   SmartArrayPointer<char> name_string = name()->ToCString();
    337   stream->Add("%s #%d / ", *name_string, arity());
    338 }
    339 
    340 
    341 void LCallKnownGlobal::PrintDataTo(StringStream* stream) {
    342   stream->Add("#%d / ", arity());
    343 }
    344 
    345 
    346 void LCallNew::PrintDataTo(StringStream* stream) {
    347   stream->Add("= ");
    348   InputAt(0)->PrintTo(stream);
    349   stream->Add(" #%d / ", arity());
    350 }
    351 
    352 
    353 void LAccessArgumentsAt::PrintDataTo(StringStream* stream) {
    354   arguments()->PrintTo(stream);
    355 
    356   stream->Add(" length ");
    357   length()->PrintTo(stream);
    358 
    359   stream->Add(" index ");
    360   index()->PrintTo(stream);
    361 }
    362 
    363 
    364 void LStoreNamedField::PrintDataTo(StringStream* stream) {
    365   object()->PrintTo(stream);
    366   stream->Add(".");
    367   stream->Add(*String::cast(*name())->ToCString());
    368   stream->Add(" <- ");
    369   value()->PrintTo(stream);
    370 }
    371 
    372 
    373 void LStoreNamedGeneric::PrintDataTo(StringStream* stream) {
    374   object()->PrintTo(stream);
    375   stream->Add(".");
    376   stream->Add(*String::cast(*name())->ToCString());
    377   stream->Add(" <- ");
    378   value()->PrintTo(stream);
    379 }
    380 
    381 
    382 void LStoreKeyedFastElement::PrintDataTo(StringStream* stream) {
    383   object()->PrintTo(stream);
    384   stream->Add("[");
    385   key()->PrintTo(stream);
    386   stream->Add("] <- ");
    387   value()->PrintTo(stream);
    388 }
    389 
    390 
    391 void LStoreKeyedFastDoubleElement::PrintDataTo(StringStream* stream) {
    392   elements()->PrintTo(stream);
    393   stream->Add("[");
    394   key()->PrintTo(stream);
    395   stream->Add("] <- ");
    396   value()->PrintTo(stream);
    397 }
    398 
    399 
    400 void LStoreKeyedGeneric::PrintDataTo(StringStream* stream) {
    401   object()->PrintTo(stream);
    402   stream->Add("[");
    403   key()->PrintTo(stream);
    404   stream->Add("] <- ");
    405   value()->PrintTo(stream);
    406 }
    407 
    408 
    409 void LTransitionElementsKind::PrintDataTo(StringStream* stream) {
    410   object()->PrintTo(stream);
    411   stream->Add(" %p -> %p", *original_map(), *transitioned_map());
    412 }
    413 
    414 
    415 LChunk::LChunk(CompilationInfo* info, HGraph* graph)
    416     : spill_slot_count_(0),
    417       info_(info),
    418       graph_(graph),
    419       instructions_(32),
    420       pointer_maps_(8),
    421       inlined_closures_(1) {
    422 }
    423 
    424 
    425 int LChunk::GetNextSpillIndex(bool is_double) {
    426   // Skip a slot if for a double-width slot.
    427   if (is_double) spill_slot_count_++;
    428   return spill_slot_count_++;
    429 }
    430 
    431 
    432 LOperand* LChunk::GetNextSpillSlot(bool is_double)  {
    433   int index = GetNextSpillIndex(is_double);
    434   if (is_double) {
    435     return LDoubleStackSlot::Create(index);
    436   } else {
    437     return LStackSlot::Create(index);
    438   }
    439 }
    440 
    441 
    442 void LChunk::MarkEmptyBlocks() {
    443   HPhase phase("L_Mark empty blocks", this);
    444   for (int i = 0; i < graph()->blocks()->length(); ++i) {
    445     HBasicBlock* block = graph()->blocks()->at(i);
    446     int first = block->first_instruction_index();
    447     int last = block->last_instruction_index();
    448     LInstruction* first_instr = instructions()->at(first);
    449     LInstruction* last_instr = instructions()->at(last);
    450 
    451     LLabel* label = LLabel::cast(first_instr);
    452     if (last_instr->IsGoto()) {
    453       LGoto* goto_instr = LGoto::cast(last_instr);
    454       if (label->IsRedundant() &&
    455           !label->is_loop_header()) {
    456         bool can_eliminate = true;
    457         for (int i = first + 1; i < last && can_eliminate; ++i) {
    458           LInstruction* cur = instructions()->at(i);
    459           if (cur->IsGap()) {
    460             LGap* gap = LGap::cast(cur);
    461             if (!gap->IsRedundant()) {
    462               can_eliminate = false;
    463             }
    464           } else {
    465             can_eliminate = false;
    466           }
    467         }
    468 
    469         if (can_eliminate) {
    470           label->set_replacement(GetLabel(goto_instr->block_id()));
    471         }
    472       }
    473     }
    474   }
    475 }
    476 
    477 
    478 void LChunk::AddInstruction(LInstruction* instr, HBasicBlock* block) {
    479   LInstructionGap* gap = new(graph_->zone()) LInstructionGap(block);
    480   int index = -1;
    481   if (instr->IsControl()) {
    482     instructions_.Add(gap);
    483     index = instructions_.length();
    484     instructions_.Add(instr);
    485   } else {
    486     index = instructions_.length();
    487     instructions_.Add(instr);
    488     instructions_.Add(gap);
    489   }
    490   if (instr->HasPointerMap()) {
    491     pointer_maps_.Add(instr->pointer_map());
    492     instr->pointer_map()->set_lithium_position(index);
    493   }
    494 }
    495 
    496 
    497 LConstantOperand* LChunk::DefineConstantOperand(HConstant* constant) {
    498   return LConstantOperand::Create(constant->id());
    499 }
    500 
    501 
    502 int LChunk::GetParameterStackSlot(int index) const {
    503   // The receiver is at index 0, the first parameter at index 1, so we
    504   // shift all parameter indexes down by the number of parameters, and
    505   // make sure they end up negative so they are distinguishable from
    506   // spill slots.
    507   int result = index - info()->scope()->num_parameters() - 1;
    508   ASSERT(result < 0);
    509   return result;
    510 }
    511 
    512 // A parameter relative to ebp in the arguments stub.
    513 int LChunk::ParameterAt(int index) {
    514   ASSERT(-1 <= index);  // -1 is the receiver.
    515   return (1 + info()->scope()->num_parameters() - index) *
    516       kPointerSize;
    517 }
    518 
    519 
    520 LGap* LChunk::GetGapAt(int index) const {
    521   return LGap::cast(instructions_[index]);
    522 }
    523 
    524 
    525 bool LChunk::IsGapAt(int index) const {
    526   return instructions_[index]->IsGap();
    527 }
    528 
    529 
    530 int LChunk::NearestGapPos(int index) const {
    531   while (!IsGapAt(index)) index--;
    532   return index;
    533 }
    534 
    535 
    536 void LChunk::AddGapMove(int index, LOperand* from, LOperand* to) {
    537   GetGapAt(index)->GetOrCreateParallelMove(LGap::START)->AddMove(from, to);
    538 }
    539 
    540 
    541 Handle<Object> LChunk::LookupLiteral(LConstantOperand* operand) const {
    542   return HConstant::cast(graph_->LookupValue(operand->index()))->handle();
    543 }
    544 
    545 
    546 Representation LChunk::LookupLiteralRepresentation(
    547     LConstantOperand* operand) const {
    548   return graph_->LookupValue(operand->index())->representation();
    549 }
    550 
    551 
    552 LChunk* LChunkBuilder::Build() {
    553   ASSERT(is_unused());
    554   chunk_ = new(zone()) LChunk(info(), graph());
    555   HPhase phase("L_Building chunk", chunk_);
    556   status_ = BUILDING;
    557   const ZoneList<HBasicBlock*>* blocks = graph()->blocks();
    558   for (int i = 0; i < blocks->length(); i++) {
    559     HBasicBlock* next = NULL;
    560     if (i < blocks->length() - 1) next = blocks->at(i + 1);
    561     DoBasicBlock(blocks->at(i), next);
    562     if (is_aborted()) return NULL;
    563   }
    564   status_ = DONE;
    565   return chunk_;
    566 }
    567 
    568 
    569 void LChunkBuilder::Abort(const char* format, ...) {
    570   if (FLAG_trace_bailout) {
    571     SmartArrayPointer<char> name(
    572         info()->shared_info()->DebugName()->ToCString());
    573     PrintF("Aborting LChunk building in @\"%s\": ", *name);
    574     va_list arguments;
    575     va_start(arguments, format);
    576     OS::VPrint(format, arguments);
    577     va_end(arguments);
    578     PrintF("\n");
    579   }
    580   status_ = ABORTED;
    581 }
    582 
    583 
    584 LUnallocated* LChunkBuilder::ToUnallocated(Register reg) {
    585   return new(zone()) LUnallocated(LUnallocated::FIXED_REGISTER,
    586                                   Register::ToAllocationIndex(reg));
    587 }
    588 
    589 
    590 LUnallocated* LChunkBuilder::ToUnallocated(DoubleRegister reg) {
    591   return new(zone()) LUnallocated(LUnallocated::FIXED_DOUBLE_REGISTER,
    592                                   DoubleRegister::ToAllocationIndex(reg));
    593 }
    594 
    595 
    596 LOperand* LChunkBuilder::UseFixed(HValue* value, Register fixed_register) {
    597   return Use(value, ToUnallocated(fixed_register));
    598 }
    599 
    600 
    601 LOperand* LChunkBuilder::UseFixedDouble(HValue* value, DoubleRegister reg) {
    602   return Use(value, ToUnallocated(reg));
    603 }
    604 
    605 
    606 LOperand* LChunkBuilder::UseRegister(HValue* value) {
    607   return Use(value, new(zone()) LUnallocated(LUnallocated::MUST_HAVE_REGISTER));
    608 }
    609 
    610 
    611 LOperand* LChunkBuilder::UseRegisterAtStart(HValue* value) {
    612   return Use(value,
    613              new(zone()) LUnallocated(LUnallocated::MUST_HAVE_REGISTER,
    614                                       LUnallocated::USED_AT_START));
    615 }
    616 
    617 
    618 LOperand* LChunkBuilder::UseTempRegister(HValue* value) {
    619   return Use(value, new(zone()) LUnallocated(LUnallocated::WRITABLE_REGISTER));
    620 }
    621 
    622 
    623 LOperand* LChunkBuilder::Use(HValue* value) {
    624   return Use(value, new(zone()) LUnallocated(LUnallocated::NONE));
    625 }
    626 
    627 
    628 LOperand* LChunkBuilder::UseAtStart(HValue* value) {
    629   return Use(value, new(zone()) LUnallocated(LUnallocated::NONE,
    630                                              LUnallocated::USED_AT_START));
    631 }
    632 
    633 
    634 LOperand* LChunkBuilder::UseOrConstant(HValue* value) {
    635   return value->IsConstant()
    636       ? chunk_->DefineConstantOperand(HConstant::cast(value))
    637       : Use(value);
    638 }
    639 
    640 
    641 LOperand* LChunkBuilder::UseOrConstantAtStart(HValue* value) {
    642   return value->IsConstant()
    643       ? chunk_->DefineConstantOperand(HConstant::cast(value))
    644       : UseAtStart(value);
    645 }
    646 
    647 
    648 LOperand* LChunkBuilder::UseRegisterOrConstant(HValue* value) {
    649   return value->IsConstant()
    650       ? chunk_->DefineConstantOperand(HConstant::cast(value))
    651       : UseRegister(value);
    652 }
    653 
    654 
    655 LOperand* LChunkBuilder::UseRegisterOrConstantAtStart(HValue* value) {
    656   return value->IsConstant()
    657       ? chunk_->DefineConstantOperand(HConstant::cast(value))
    658       : UseRegisterAtStart(value);
    659 }
    660 
    661 
    662 LOperand* LChunkBuilder::UseAny(HValue* value) {
    663   return value->IsConstant()
    664       ? chunk_->DefineConstantOperand(HConstant::cast(value))
    665       :  Use(value, new(zone()) LUnallocated(LUnallocated::ANY));
    666 }
    667 
    668 
    669 LOperand* LChunkBuilder::Use(HValue* value, LUnallocated* operand) {
    670   if (value->EmitAtUses()) {
    671     HInstruction* instr = HInstruction::cast(value);
    672     VisitInstruction(instr);
    673   }
    674   operand->set_virtual_register(value->id());
    675   return operand;
    676 }
    677 
    678 
    679 template<int I, int T>
    680 LInstruction* LChunkBuilder::Define(LTemplateInstruction<1, I, T>* instr,
    681                                     LUnallocated* result) {
    682   result->set_virtual_register(current_instruction_->id());
    683   instr->set_result(result);
    684   return instr;
    685 }
    686 
    687 
    688 template<int I, int T>
    689 LInstruction* LChunkBuilder::DefineAsRegister(
    690     LTemplateInstruction<1, I, T>* instr) {
    691   return Define(instr,
    692                 new(zone()) LUnallocated(LUnallocated::MUST_HAVE_REGISTER));
    693 }
    694 
    695 
    696 template<int I, int T>
    697 LInstruction* LChunkBuilder::DefineAsSpilled(
    698     LTemplateInstruction<1, I, T>* instr, int index) {
    699   return Define(instr,
    700                 new(zone()) LUnallocated(LUnallocated::FIXED_SLOT, index));
    701 }
    702 
    703 
    704 template<int I, int T>
    705 LInstruction* LChunkBuilder::DefineSameAsFirst(
    706     LTemplateInstruction<1, I, T>* instr) {
    707   return Define(instr,
    708                 new(zone()) LUnallocated(LUnallocated::SAME_AS_FIRST_INPUT));
    709 }
    710 
    711 
    712 template<int I, int T>
    713 LInstruction* LChunkBuilder::DefineFixed(
    714     LTemplateInstruction<1, I, T>* instr, Register reg) {
    715   return Define(instr, ToUnallocated(reg));
    716 }
    717 
    718 
    719 template<int I, int T>
    720 LInstruction* LChunkBuilder::DefineFixedDouble(
    721     LTemplateInstruction<1, I, T>* instr, DoubleRegister reg) {
    722   return Define(instr, ToUnallocated(reg));
    723 }
    724 
    725 
    726 LInstruction* LChunkBuilder::AssignEnvironment(LInstruction* instr) {
    727   HEnvironment* hydrogen_env = current_block_->last_environment();
    728   int argument_index_accumulator = 0;
    729   instr->set_environment(CreateEnvironment(hydrogen_env,
    730                                            &argument_index_accumulator));
    731   return instr;
    732 }
    733 
    734 
    735 LInstruction* LChunkBuilder::SetInstructionPendingDeoptimizationEnvironment(
    736     LInstruction* instr, int ast_id) {
    737   ASSERT(instruction_pending_deoptimization_environment_ == NULL);
    738   ASSERT(pending_deoptimization_ast_id_ == AstNode::kNoNumber);
    739   instruction_pending_deoptimization_environment_ = instr;
    740   pending_deoptimization_ast_id_ = ast_id;
    741   return instr;
    742 }
    743 
    744 
    745 void LChunkBuilder::ClearInstructionPendingDeoptimizationEnvironment() {
    746   instruction_pending_deoptimization_environment_ = NULL;
    747   pending_deoptimization_ast_id_ = AstNode::kNoNumber;
    748 }
    749 
    750 
    751 LInstruction* LChunkBuilder::MarkAsCall(LInstruction* instr,
    752                                         HInstruction* hinstr,
    753                                         CanDeoptimize can_deoptimize) {
    754 #ifdef DEBUG
    755   instr->VerifyCall();
    756 #endif
    757   instr->MarkAsCall();
    758   instr = AssignPointerMap(instr);
    759 
    760   if (hinstr->HasObservableSideEffects()) {
    761     ASSERT(hinstr->next()->IsSimulate());
    762     HSimulate* sim = HSimulate::cast(hinstr->next());
    763     instr = SetInstructionPendingDeoptimizationEnvironment(
    764         instr, sim->ast_id());
    765   }
    766 
    767   // If instruction does not have side-effects lazy deoptimization
    768   // after the call will try to deoptimize to the point before the call.
    769   // Thus we still need to attach environment to this call even if
    770   // call sequence can not deoptimize eagerly.
    771   bool needs_environment =
    772       (can_deoptimize == CAN_DEOPTIMIZE_EAGERLY) ||
    773       !hinstr->HasObservableSideEffects();
    774   if (needs_environment && !instr->HasEnvironment()) {
    775     instr = AssignEnvironment(instr);
    776   }
    777 
    778   return instr;
    779 }
    780 
    781 
    782 LInstruction* LChunkBuilder::MarkAsSaveDoubles(LInstruction* instr) {
    783   instr->MarkAsSaveDoubles();
    784   return instr;
    785 }
    786 
    787 
    788 LInstruction* LChunkBuilder::AssignPointerMap(LInstruction* instr) {
    789   ASSERT(!instr->HasPointerMap());
    790   instr->set_pointer_map(new(zone()) LPointerMap(position_));
    791   return instr;
    792 }
    793 
    794 
    795 LUnallocated* LChunkBuilder::TempRegister() {
    796   LUnallocated* operand =
    797       new(zone()) LUnallocated(LUnallocated::MUST_HAVE_REGISTER);
    798   operand->set_virtual_register(allocator_->GetVirtualRegister());
    799   if (!allocator_->AllocationOk()) Abort("Not enough virtual registers.");
    800   return operand;
    801 }
    802 
    803 
    804 LOperand* LChunkBuilder::FixedTemp(Register reg) {
    805   LUnallocated* operand = ToUnallocated(reg);
    806   ASSERT(operand->HasFixedPolicy());
    807   return operand;
    808 }
    809 
    810 
    811 LOperand* LChunkBuilder::FixedTemp(DoubleRegister reg) {
    812   LUnallocated* operand = ToUnallocated(reg);
    813   ASSERT(operand->HasFixedPolicy());
    814   return operand;
    815 }
    816 
    817 
    818 LInstruction* LChunkBuilder::DoBlockEntry(HBlockEntry* instr) {
    819   return new(zone()) LLabel(instr->block());
    820 }
    821 
    822 
    823 LInstruction* LChunkBuilder::DoSoftDeoptimize(HSoftDeoptimize* instr) {
    824   return AssignEnvironment(new(zone()) LDeoptimize);
    825 }
    826 
    827 
    828 LInstruction* LChunkBuilder::DoDeoptimize(HDeoptimize* instr) {
    829   return AssignEnvironment(new(zone()) LDeoptimize);
    830 }
    831 
    832 
    833 LInstruction* LChunkBuilder::DoShift(Token::Value op,
    834                                      HBitwiseBinaryOperation* instr) {
    835   if (instr->representation().IsTagged()) {
    836     ASSERT(instr->left()->representation().IsTagged());
    837     ASSERT(instr->right()->representation().IsTagged());
    838 
    839     LOperand* left = UseFixed(instr->left(), r1);
    840     LOperand* right = UseFixed(instr->right(), r0);
    841     LArithmeticT* result = new(zone()) LArithmeticT(op, left, right);
    842     return MarkAsCall(DefineFixed(result, r0), instr);
    843   }
    844 
    845   ASSERT(instr->representation().IsInteger32());
    846   ASSERT(instr->left()->representation().IsInteger32());
    847   ASSERT(instr->right()->representation().IsInteger32());
    848   LOperand* left = UseRegisterAtStart(instr->left());
    849 
    850   HValue* right_value = instr->right();
    851   LOperand* right = NULL;
    852   int constant_value = 0;
    853   if (right_value->IsConstant()) {
    854     HConstant* constant = HConstant::cast(right_value);
    855     right = chunk_->DefineConstantOperand(constant);
    856     constant_value = constant->Integer32Value() & 0x1f;
    857   } else {
    858     right = UseRegisterAtStart(right_value);
    859   }
    860 
    861   // Shift operations can only deoptimize if we do a logical shift
    862   // by 0 and the result cannot be truncated to int32.
    863   bool may_deopt = (op == Token::SHR && constant_value == 0);
    864   bool does_deopt = false;
    865   if (may_deopt) {
    866     for (HUseIterator it(instr->uses()); !it.Done(); it.Advance()) {
    867       if (!it.value()->CheckFlag(HValue::kTruncatingToInt32)) {
    868         does_deopt = true;
    869         break;
    870       }
    871     }
    872   }
    873 
    874   LInstruction* result =
    875       DefineAsRegister(new(zone()) LShiftI(op, left, right, does_deopt));
    876   return does_deopt ? AssignEnvironment(result) : result;
    877 }
    878 
    879 
    880 LInstruction* LChunkBuilder::DoArithmeticD(Token::Value op,
    881                                            HArithmeticBinaryOperation* instr) {
    882   ASSERT(instr->representation().IsDouble());
    883   ASSERT(instr->left()->representation().IsDouble());
    884   ASSERT(instr->right()->representation().IsDouble());
    885   ASSERT(op != Token::MOD);
    886   LOperand* left = UseRegisterAtStart(instr->left());
    887   LOperand* right = UseRegisterAtStart(instr->right());
    888   LArithmeticD* result = new(zone()) LArithmeticD(op, left, right);
    889   return DefineAsRegister(result);
    890 }
    891 
    892 
    893 LInstruction* LChunkBuilder::DoArithmeticT(Token::Value op,
    894                                            HArithmeticBinaryOperation* instr) {
    895   ASSERT(op == Token::ADD ||
    896          op == Token::DIV ||
    897          op == Token::MOD ||
    898          op == Token::MUL ||
    899          op == Token::SUB);
    900   HValue* left = instr->left();
    901   HValue* right = instr->right();
    902   ASSERT(left->representation().IsTagged());
    903   ASSERT(right->representation().IsTagged());
    904   LOperand* left_operand = UseFixed(left, r1);
    905   LOperand* right_operand = UseFixed(right, r0);
    906   LArithmeticT* result =
    907       new(zone()) LArithmeticT(op, left_operand, right_operand);
    908   return MarkAsCall(DefineFixed(result, r0), instr);
    909 }
    910 
    911 
    912 void LChunkBuilder::DoBasicBlock(HBasicBlock* block, HBasicBlock* next_block) {
    913   ASSERT(is_building());
    914   current_block_ = block;
    915   next_block_ = next_block;
    916   if (block->IsStartBlock()) {
    917     block->UpdateEnvironment(graph_->start_environment());
    918     argument_count_ = 0;
    919   } else if (block->predecessors()->length() == 1) {
    920     // We have a single predecessor => copy environment and outgoing
    921     // argument count from the predecessor.
    922     ASSERT(block->phis()->length() == 0);
    923     HBasicBlock* pred = block->predecessors()->at(0);
    924     HEnvironment* last_environment = pred->last_environment();
    925     ASSERT(last_environment != NULL);
    926     // Only copy the environment, if it is later used again.
    927     if (pred->end()->SecondSuccessor() == NULL) {
    928       ASSERT(pred->end()->FirstSuccessor() == block);
    929     } else {
    930       if (pred->end()->FirstSuccessor()->block_id() > block->block_id() ||
    931           pred->end()->SecondSuccessor()->block_id() > block->block_id()) {
    932         last_environment = last_environment->Copy();
    933       }
    934     }
    935     block->UpdateEnvironment(last_environment);
    936     ASSERT(pred->argument_count() >= 0);
    937     argument_count_ = pred->argument_count();
    938   } else {
    939     // We are at a state join => process phis.
    940     HBasicBlock* pred = block->predecessors()->at(0);
    941     // No need to copy the environment, it cannot be used later.
    942     HEnvironment* last_environment = pred->last_environment();
    943     for (int i = 0; i < block->phis()->length(); ++i) {
    944       HPhi* phi = block->phis()->at(i);
    945       last_environment->SetValueAt(phi->merged_index(), phi);
    946     }
    947     for (int i = 0; i < block->deleted_phis()->length(); ++i) {
    948       last_environment->SetValueAt(block->deleted_phis()->at(i),
    949                                    graph_->GetConstantUndefined());
    950     }
    951     block->UpdateEnvironment(last_environment);
    952     // Pick up the outgoing argument count of one of the predecessors.
    953     argument_count_ = pred->argument_count();
    954   }
    955   HInstruction* current = block->first();
    956   int start = chunk_->instructions()->length();
    957   while (current != NULL && !is_aborted()) {
    958     // Code for constants in registers is generated lazily.
    959     if (!current->EmitAtUses()) {
    960       VisitInstruction(current);
    961     }
    962     current = current->next();
    963   }
    964   int end = chunk_->instructions()->length() - 1;
    965   if (end >= start) {
    966     block->set_first_instruction_index(start);
    967     block->set_last_instruction_index(end);
    968   }
    969   block->set_argument_count(argument_count_);
    970   next_block_ = NULL;
    971   current_block_ = NULL;
    972 }
    973 
    974 
    975 void LChunkBuilder::VisitInstruction(HInstruction* current) {
    976   HInstruction* old_current = current_instruction_;
    977   current_instruction_ = current;
    978   if (current->has_position()) position_ = current->position();
    979   LInstruction* instr = current->CompileToLithium(this);
    980 
    981   if (instr != NULL) {
    982     if (FLAG_stress_pointer_maps && !instr->HasPointerMap()) {
    983       instr = AssignPointerMap(instr);
    984     }
    985     if (FLAG_stress_environments && !instr->HasEnvironment()) {
    986       instr = AssignEnvironment(instr);
    987     }
    988     instr->set_hydrogen_value(current);
    989     chunk_->AddInstruction(instr, current_block_);
    990   }
    991   current_instruction_ = old_current;
    992 }
    993 
    994 
    995 LEnvironment* LChunkBuilder::CreateEnvironment(
    996     HEnvironment* hydrogen_env,
    997     int* argument_index_accumulator) {
    998   if (hydrogen_env == NULL) return NULL;
    999 
   1000   LEnvironment* outer =
   1001       CreateEnvironment(hydrogen_env->outer(), argument_index_accumulator);
   1002   int ast_id = hydrogen_env->ast_id();
   1003   ASSERT(ast_id != AstNode::kNoNumber ||
   1004          hydrogen_env->frame_type() != JS_FUNCTION);
   1005   int value_count = hydrogen_env->length();
   1006   LEnvironment* result = new(zone()) LEnvironment(
   1007       hydrogen_env->closure(),
   1008       hydrogen_env->frame_type(),
   1009       ast_id,
   1010       hydrogen_env->parameter_count(),
   1011       argument_count_,
   1012       value_count,
   1013       outer);
   1014   int argument_index = *argument_index_accumulator;
   1015   for (int i = 0; i < value_count; ++i) {
   1016     if (hydrogen_env->is_special_index(i)) continue;
   1017 
   1018     HValue* value = hydrogen_env->values()->at(i);
   1019     LOperand* op = NULL;
   1020     if (value->IsArgumentsObject()) {
   1021       op = NULL;
   1022     } else if (value->IsPushArgument()) {
   1023       op = new(zone()) LArgument(argument_index++);
   1024     } else {
   1025       op = UseAny(value);
   1026     }
   1027     result->AddValue(op, value->representation());
   1028   }
   1029 
   1030   if (hydrogen_env->frame_type() == JS_FUNCTION) {
   1031     *argument_index_accumulator = argument_index;
   1032   }
   1033 
   1034   return result;
   1035 }
   1036 
   1037 
   1038 LInstruction* LChunkBuilder::DoGoto(HGoto* instr) {
   1039   return new(zone()) LGoto(instr->FirstSuccessor()->block_id());
   1040 }
   1041 
   1042 
   1043 LInstruction* LChunkBuilder::DoBranch(HBranch* instr) {
   1044   HValue* value = instr->value();
   1045   if (value->EmitAtUses()) {
   1046     HBasicBlock* successor = HConstant::cast(value)->ToBoolean()
   1047         ? instr->FirstSuccessor()
   1048         : instr->SecondSuccessor();
   1049     return new(zone()) LGoto(successor->block_id());
   1050   }
   1051 
   1052   LBranch* result = new(zone()) LBranch(UseRegister(value));
   1053   // Tagged values that are not known smis or booleans require a
   1054   // deoptimization environment.
   1055   Representation rep = value->representation();
   1056   HType type = value->type();
   1057   if (rep.IsTagged() && !type.IsSmi() && !type.IsBoolean()) {
   1058     return AssignEnvironment(result);
   1059   }
   1060   return result;
   1061 }
   1062 
   1063 
   1064 
   1065 LInstruction* LChunkBuilder::DoCompareMap(HCompareMap* instr) {
   1066   ASSERT(instr->value()->representation().IsTagged());
   1067   LOperand* value = UseRegisterAtStart(instr->value());
   1068   LOperand* temp = TempRegister();
   1069   return new(zone()) LCmpMapAndBranch(value, temp);
   1070 }
   1071 
   1072 
   1073 LInstruction* LChunkBuilder::DoArgumentsLength(HArgumentsLength* instr) {
   1074   LOperand* value = UseRegister(instr->value());
   1075   return DefineAsRegister(new(zone()) LArgumentsLength(value));
   1076 }
   1077 
   1078 
   1079 LInstruction* LChunkBuilder::DoArgumentsElements(HArgumentsElements* elems) {
   1080   return DefineAsRegister(new(zone()) LArgumentsElements);
   1081 }
   1082 
   1083 
   1084 LInstruction* LChunkBuilder::DoInstanceOf(HInstanceOf* instr) {
   1085   LInstanceOf* result =
   1086       new(zone()) LInstanceOf(UseFixed(instr->left(), r0),
   1087                       UseFixed(instr->right(), r1));
   1088   return MarkAsCall(DefineFixed(result, r0), instr);
   1089 }
   1090 
   1091 
   1092 LInstruction* LChunkBuilder::DoInstanceOfKnownGlobal(
   1093     HInstanceOfKnownGlobal* instr) {
   1094   LInstanceOfKnownGlobal* result =
   1095       new(zone()) LInstanceOfKnownGlobal(UseFixed(instr->left(), r0),
   1096                                          FixedTemp(r4));
   1097   return MarkAsCall(DefineFixed(result, r0), instr);
   1098 }
   1099 
   1100 
   1101 LInstruction* LChunkBuilder::DoWrapReceiver(HWrapReceiver* instr) {
   1102   LOperand* receiver = UseRegisterAtStart(instr->receiver());
   1103   LOperand* function = UseRegisterAtStart(instr->function());
   1104   LWrapReceiver* result = new(zone()) LWrapReceiver(receiver, function);
   1105   return AssignEnvironment(DefineSameAsFirst(result));
   1106 }
   1107 
   1108 
   1109 LInstruction* LChunkBuilder::DoApplyArguments(HApplyArguments* instr) {
   1110   LOperand* function = UseFixed(instr->function(), r1);
   1111   LOperand* receiver = UseFixed(instr->receiver(), r0);
   1112   LOperand* length = UseFixed(instr->length(), r2);
   1113   LOperand* elements = UseFixed(instr->elements(), r3);
   1114   LApplyArguments* result = new(zone()) LApplyArguments(function,
   1115                                                 receiver,
   1116                                                 length,
   1117                                                 elements);
   1118   return MarkAsCall(DefineFixed(result, r0), instr, CAN_DEOPTIMIZE_EAGERLY);
   1119 }
   1120 
   1121 
   1122 LInstruction* LChunkBuilder::DoPushArgument(HPushArgument* instr) {
   1123   ++argument_count_;
   1124   LOperand* argument = Use(instr->argument());
   1125   return new(zone()) LPushArgument(argument);
   1126 }
   1127 
   1128 
   1129 LInstruction* LChunkBuilder::DoThisFunction(HThisFunction* instr) {
   1130   return instr->HasNoUses()
   1131       ? NULL
   1132       : DefineAsRegister(new(zone()) LThisFunction);
   1133 }
   1134 
   1135 
   1136 LInstruction* LChunkBuilder::DoContext(HContext* instr) {
   1137   return instr->HasNoUses() ? NULL : DefineAsRegister(new(zone()) LContext);
   1138 }
   1139 
   1140 
   1141 LInstruction* LChunkBuilder::DoOuterContext(HOuterContext* instr) {
   1142   LOperand* context = UseRegisterAtStart(instr->value());
   1143   return DefineAsRegister(new(zone()) LOuterContext(context));
   1144 }
   1145 
   1146 
   1147 LInstruction* LChunkBuilder::DoDeclareGlobals(HDeclareGlobals* instr) {
   1148   return MarkAsCall(new(zone()) LDeclareGlobals, instr);
   1149 }
   1150 
   1151 
   1152 LInstruction* LChunkBuilder::DoGlobalObject(HGlobalObject* instr) {
   1153   LOperand* context = UseRegisterAtStart(instr->value());
   1154   return DefineAsRegister(new(zone()) LGlobalObject(context));
   1155 }
   1156 
   1157 
   1158 LInstruction* LChunkBuilder::DoGlobalReceiver(HGlobalReceiver* instr) {
   1159   LOperand* global_object = UseRegisterAtStart(instr->value());
   1160   return DefineAsRegister(new(zone()) LGlobalReceiver(global_object));
   1161 }
   1162 
   1163 
   1164 LInstruction* LChunkBuilder::DoCallConstantFunction(
   1165     HCallConstantFunction* instr) {
   1166   argument_count_ -= instr->argument_count();
   1167   return MarkAsCall(DefineFixed(new(zone()) LCallConstantFunction, r0), instr);
   1168 }
   1169 
   1170 
   1171 LInstruction* LChunkBuilder::DoInvokeFunction(HInvokeFunction* instr) {
   1172   LOperand* function = UseFixed(instr->function(), r1);
   1173   argument_count_ -= instr->argument_count();
   1174   LInvokeFunction* result = new(zone()) LInvokeFunction(function);
   1175   return MarkAsCall(DefineFixed(result, r0), instr, CANNOT_DEOPTIMIZE_EAGERLY);
   1176 }
   1177 
   1178 
   1179 LInstruction* LChunkBuilder::DoUnaryMathOperation(HUnaryMathOperation* instr) {
   1180   BuiltinFunctionId op = instr->op();
   1181   if (op == kMathLog || op == kMathSin || op == kMathCos || op == kMathTan) {
   1182     LOperand* input = UseFixedDouble(instr->value(), d2);
   1183     LUnaryMathOperation* result = new(zone()) LUnaryMathOperation(input, NULL);
   1184     return MarkAsCall(DefineFixedDouble(result, d2), instr);
   1185   } else if (op == kMathPowHalf) {
   1186     LOperand* input = UseFixedDouble(instr->value(), d2);
   1187     LOperand* temp = FixedTemp(d3);
   1188     LUnaryMathOperation* result = new(zone()) LUnaryMathOperation(input, temp);
   1189     return DefineFixedDouble(result, d2);
   1190   } else {
   1191     LOperand* input = UseRegisterAtStart(instr->value());
   1192     LOperand* temp = (op == kMathFloor) ? TempRegister() : NULL;
   1193     LUnaryMathOperation* result = new(zone()) LUnaryMathOperation(input, temp);
   1194     switch (op) {
   1195       case kMathAbs:
   1196         return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
   1197       case kMathFloor:
   1198         return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
   1199       case kMathSqrt:
   1200         return DefineAsRegister(result);
   1201       case kMathRound:
   1202         return AssignEnvironment(DefineAsRegister(result));
   1203       default:
   1204         UNREACHABLE();
   1205         return NULL;
   1206     }
   1207   }
   1208 }
   1209 
   1210 
   1211 LInstruction* LChunkBuilder::DoCallKeyed(HCallKeyed* instr) {
   1212   ASSERT(instr->key()->representation().IsTagged());
   1213   argument_count_ -= instr->argument_count();
   1214   LOperand* key = UseFixed(instr->key(), r2);
   1215   return MarkAsCall(DefineFixed(new(zone()) LCallKeyed(key), r0), instr);
   1216 }
   1217 
   1218 
   1219 LInstruction* LChunkBuilder::DoCallNamed(HCallNamed* instr) {
   1220   argument_count_ -= instr->argument_count();
   1221   return MarkAsCall(DefineFixed(new(zone()) LCallNamed, r0), instr);
   1222 }
   1223 
   1224 
   1225 LInstruction* LChunkBuilder::DoCallGlobal(HCallGlobal* instr) {
   1226   argument_count_ -= instr->argument_count();
   1227   return MarkAsCall(DefineFixed(new(zone()) LCallGlobal, r0), instr);
   1228 }
   1229 
   1230 
   1231 LInstruction* LChunkBuilder::DoCallKnownGlobal(HCallKnownGlobal* instr) {
   1232   argument_count_ -= instr->argument_count();
   1233   return MarkAsCall(DefineFixed(new(zone()) LCallKnownGlobal, r0), instr);
   1234 }
   1235 
   1236 
   1237 LInstruction* LChunkBuilder::DoCallNew(HCallNew* instr) {
   1238   LOperand* constructor = UseFixed(instr->constructor(), r1);
   1239   argument_count_ -= instr->argument_count();
   1240   LCallNew* result = new(zone()) LCallNew(constructor);
   1241   return MarkAsCall(DefineFixed(result, r0), instr);
   1242 }
   1243 
   1244 
   1245 LInstruction* LChunkBuilder::DoCallFunction(HCallFunction* instr) {
   1246   LOperand* function = UseFixed(instr->function(), r1);
   1247   argument_count_ -= instr->argument_count();
   1248   return MarkAsCall(DefineFixed(new(zone()) LCallFunction(function), r0),
   1249                     instr);
   1250 }
   1251 
   1252 
   1253 LInstruction* LChunkBuilder::DoCallRuntime(HCallRuntime* instr) {
   1254   argument_count_ -= instr->argument_count();
   1255   return MarkAsCall(DefineFixed(new(zone()) LCallRuntime, r0), instr);
   1256 }
   1257 
   1258 
   1259 LInstruction* LChunkBuilder::DoShr(HShr* instr) {
   1260   return DoShift(Token::SHR, instr);
   1261 }
   1262 
   1263 
   1264 LInstruction* LChunkBuilder::DoSar(HSar* instr) {
   1265   return DoShift(Token::SAR, instr);
   1266 }
   1267 
   1268 
   1269 LInstruction* LChunkBuilder::DoShl(HShl* instr) {
   1270   return DoShift(Token::SHL, instr);
   1271 }
   1272 
   1273 
   1274 LInstruction* LChunkBuilder::DoBitwise(HBitwise* instr) {
   1275   if (instr->representation().IsInteger32()) {
   1276     ASSERT(instr->left()->representation().IsInteger32());
   1277     ASSERT(instr->right()->representation().IsInteger32());
   1278 
   1279     LOperand* left = UseRegisterAtStart(instr->LeastConstantOperand());
   1280     LOperand* right = UseOrConstantAtStart(instr->MostConstantOperand());
   1281     return DefineAsRegister(new(zone()) LBitI(left, right));
   1282   } else {
   1283     ASSERT(instr->representation().IsTagged());
   1284     ASSERT(instr->left()->representation().IsTagged());
   1285     ASSERT(instr->right()->representation().IsTagged());
   1286 
   1287     LOperand* left = UseFixed(instr->left(), r1);
   1288     LOperand* right = UseFixed(instr->right(), r0);
   1289     LArithmeticT* result = new(zone()) LArithmeticT(instr->op(), left, right);
   1290     return MarkAsCall(DefineFixed(result, r0), instr);
   1291   }
   1292 }
   1293 
   1294 
   1295 LInstruction* LChunkBuilder::DoBitNot(HBitNot* instr) {
   1296   ASSERT(instr->value()->representation().IsInteger32());
   1297   ASSERT(instr->representation().IsInteger32());
   1298   LOperand* value = UseRegisterAtStart(instr->value());
   1299   return DefineAsRegister(new(zone()) LBitNotI(value));
   1300 }
   1301 
   1302 
   1303 LInstruction* LChunkBuilder::DoDiv(HDiv* instr) {
   1304   if (instr->representation().IsDouble()) {
   1305     return DoArithmeticD(Token::DIV, instr);
   1306   } else if (instr->representation().IsInteger32()) {
   1307     // TODO(1042) The fixed register allocation
   1308     // is needed because we call TypeRecordingBinaryOpStub from
   1309     // the generated code, which requires registers r0
   1310     // and r1 to be used. We should remove that
   1311     // when we provide a native implementation.
   1312     LOperand* dividend = UseFixed(instr->left(), r0);
   1313     LOperand* divisor = UseFixed(instr->right(), r1);
   1314     return AssignEnvironment(AssignPointerMap(
   1315              DefineFixed(new(zone()) LDivI(dividend, divisor), r0)));
   1316   } else {
   1317     return DoArithmeticT(Token::DIV, instr);
   1318   }
   1319 }
   1320 
   1321 
   1322 LInstruction* LChunkBuilder::DoMod(HMod* instr) {
   1323   if (instr->representation().IsInteger32()) {
   1324     ASSERT(instr->left()->representation().IsInteger32());
   1325     ASSERT(instr->right()->representation().IsInteger32());
   1326 
   1327     LModI* mod;
   1328     if (instr->HasPowerOf2Divisor()) {
   1329       ASSERT(!instr->CheckFlag(HValue::kCanBeDivByZero));
   1330       LOperand* value = UseRegisterAtStart(instr->left());
   1331       mod = new(zone()) LModI(value, UseOrConstant(instr->right()));
   1332     } else {
   1333       LOperand* dividend = UseRegister(instr->left());
   1334       LOperand* divisor = UseRegister(instr->right());
   1335       mod = new(zone()) LModI(dividend,
   1336                               divisor,
   1337                               TempRegister(),
   1338                               FixedTemp(d10),
   1339                               FixedTemp(d11));
   1340     }
   1341 
   1342     if (instr->CheckFlag(HValue::kBailoutOnMinusZero) ||
   1343         instr->CheckFlag(HValue::kCanBeDivByZero)) {
   1344       return AssignEnvironment(DefineAsRegister(mod));
   1345     } else {
   1346       return DefineAsRegister(mod);
   1347     }
   1348   } else if (instr->representation().IsTagged()) {
   1349     return DoArithmeticT(Token::MOD, instr);
   1350   } else {
   1351     ASSERT(instr->representation().IsDouble());
   1352     // We call a C function for double modulo. It can't trigger a GC.
   1353     // We need to use fixed result register for the call.
   1354     // TODO(fschneider): Allow any register as input registers.
   1355     LOperand* left = UseFixedDouble(instr->left(), d1);
   1356     LOperand* right = UseFixedDouble(instr->right(), d2);
   1357     LArithmeticD* result = new(zone()) LArithmeticD(Token::MOD, left, right);
   1358     return MarkAsCall(DefineFixedDouble(result, d1), instr);
   1359   }
   1360 }
   1361 
   1362 
   1363 LInstruction* LChunkBuilder::DoMul(HMul* instr) {
   1364   if (instr->representation().IsInteger32()) {
   1365     ASSERT(instr->left()->representation().IsInteger32());
   1366     ASSERT(instr->right()->representation().IsInteger32());
   1367     LOperand* left;
   1368     LOperand* right = UseOrConstant(instr->MostConstantOperand());
   1369     LOperand* temp = NULL;
   1370     if (instr->CheckFlag(HValue::kBailoutOnMinusZero) &&
   1371         (instr->CheckFlag(HValue::kCanOverflow) ||
   1372         !right->IsConstantOperand())) {
   1373       left = UseRegister(instr->LeastConstantOperand());
   1374       temp = TempRegister();
   1375     } else {
   1376       left = UseRegisterAtStart(instr->LeastConstantOperand());
   1377     }
   1378     LMulI* mul = new(zone()) LMulI(left, right, temp);
   1379     if (instr->CheckFlag(HValue::kCanOverflow) ||
   1380         instr->CheckFlag(HValue::kBailoutOnMinusZero)) {
   1381       AssignEnvironment(mul);
   1382     }
   1383     return DefineAsRegister(mul);
   1384 
   1385   } else if (instr->representation().IsDouble()) {
   1386     return DoArithmeticD(Token::MUL, instr);
   1387 
   1388   } else {
   1389     return DoArithmeticT(Token::MUL, instr);
   1390   }
   1391 }
   1392 
   1393 
   1394 LInstruction* LChunkBuilder::DoSub(HSub* instr) {
   1395   if (instr->representation().IsInteger32()) {
   1396     ASSERT(instr->left()->representation().IsInteger32());
   1397     ASSERT(instr->right()->representation().IsInteger32());
   1398     LOperand* left = UseRegisterAtStart(instr->left());
   1399     LOperand* right = UseOrConstantAtStart(instr->right());
   1400     LSubI* sub = new(zone()) LSubI(left, right);
   1401     LInstruction* result = DefineAsRegister(sub);
   1402     if (instr->CheckFlag(HValue::kCanOverflow)) {
   1403       result = AssignEnvironment(result);
   1404     }
   1405     return result;
   1406   } else if (instr->representation().IsDouble()) {
   1407     return DoArithmeticD(Token::SUB, instr);
   1408   } else {
   1409     return DoArithmeticT(Token::SUB, instr);
   1410   }
   1411 }
   1412 
   1413 
   1414 LInstruction* LChunkBuilder::DoAdd(HAdd* instr) {
   1415   if (instr->representation().IsInteger32()) {
   1416     ASSERT(instr->left()->representation().IsInteger32());
   1417     ASSERT(instr->right()->representation().IsInteger32());
   1418     LOperand* left = UseRegisterAtStart(instr->LeastConstantOperand());
   1419     LOperand* right = UseOrConstantAtStart(instr->MostConstantOperand());
   1420     LAddI* add = new(zone()) LAddI(left, right);
   1421     LInstruction* result = DefineAsRegister(add);
   1422     if (instr->CheckFlag(HValue::kCanOverflow)) {
   1423       result = AssignEnvironment(result);
   1424     }
   1425     return result;
   1426   } else if (instr->representation().IsDouble()) {
   1427     return DoArithmeticD(Token::ADD, instr);
   1428   } else {
   1429     ASSERT(instr->representation().IsTagged());
   1430     return DoArithmeticT(Token::ADD, instr);
   1431   }
   1432 }
   1433 
   1434 
   1435 LInstruction* LChunkBuilder::DoPower(HPower* instr) {
   1436   ASSERT(instr->representation().IsDouble());
   1437   // We call a C function for double power. It can't trigger a GC.
   1438   // We need to use fixed result register for the call.
   1439   Representation exponent_type = instr->right()->representation();
   1440   ASSERT(instr->left()->representation().IsDouble());
   1441   LOperand* left = UseFixedDouble(instr->left(), d1);
   1442   LOperand* right = exponent_type.IsDouble() ?
   1443       UseFixedDouble(instr->right(), d2) :
   1444       UseFixed(instr->right(), r2);
   1445   LPower* result = new(zone()) LPower(left, right);
   1446   return MarkAsCall(DefineFixedDouble(result, d3),
   1447                     instr,
   1448                     CAN_DEOPTIMIZE_EAGERLY);
   1449 }
   1450 
   1451 
   1452 LInstruction* LChunkBuilder::DoRandom(HRandom* instr) {
   1453   ASSERT(instr->representation().IsDouble());
   1454   ASSERT(instr->global_object()->representation().IsTagged());
   1455   LOperand* global_object = UseFixed(instr->global_object(), r0);
   1456   LRandom* result = new(zone()) LRandom(global_object);
   1457   return MarkAsCall(DefineFixedDouble(result, d7), instr);
   1458 }
   1459 
   1460 
   1461 LInstruction* LChunkBuilder::DoCompareGeneric(HCompareGeneric* instr) {
   1462   ASSERT(instr->left()->representation().IsTagged());
   1463   ASSERT(instr->right()->representation().IsTagged());
   1464   LOperand* left = UseFixed(instr->left(), r1);
   1465   LOperand* right = UseFixed(instr->right(), r0);
   1466   LCmpT* result = new(zone()) LCmpT(left, right);
   1467   return MarkAsCall(DefineFixed(result, r0), instr);
   1468 }
   1469 
   1470 
   1471 LInstruction* LChunkBuilder::DoCompareIDAndBranch(
   1472     HCompareIDAndBranch* instr) {
   1473   Representation r = instr->GetInputRepresentation();
   1474   if (r.IsInteger32()) {
   1475     ASSERT(instr->left()->representation().IsInteger32());
   1476     ASSERT(instr->right()->representation().IsInteger32());
   1477     LOperand* left = UseRegisterOrConstantAtStart(instr->left());
   1478     LOperand* right = UseRegisterOrConstantAtStart(instr->right());
   1479     return new(zone()) LCmpIDAndBranch(left, right);
   1480   } else {
   1481     ASSERT(r.IsDouble());
   1482     ASSERT(instr->left()->representation().IsDouble());
   1483     ASSERT(instr->right()->representation().IsDouble());
   1484     LOperand* left = UseRegisterAtStart(instr->left());
   1485     LOperand* right = UseRegisterAtStart(instr->right());
   1486     return new(zone()) LCmpIDAndBranch(left, right);
   1487   }
   1488 }
   1489 
   1490 
   1491 LInstruction* LChunkBuilder::DoCompareObjectEqAndBranch(
   1492     HCompareObjectEqAndBranch* instr) {
   1493   LOperand* left = UseRegisterAtStart(instr->left());
   1494   LOperand* right = UseRegisterAtStart(instr->right());
   1495   return new(zone()) LCmpObjectEqAndBranch(left, right);
   1496 }
   1497 
   1498 
   1499 LInstruction* LChunkBuilder::DoCompareConstantEqAndBranch(
   1500     HCompareConstantEqAndBranch* instr) {
   1501   LOperand* value = UseRegisterAtStart(instr->value());
   1502   return new(zone()) LCmpConstantEqAndBranch(value);
   1503 }
   1504 
   1505 
   1506 LInstruction* LChunkBuilder::DoIsNilAndBranch(HIsNilAndBranch* instr) {
   1507   ASSERT(instr->value()->representation().IsTagged());
   1508   return new(zone()) LIsNilAndBranch(UseRegisterAtStart(instr->value()));
   1509 }
   1510 
   1511 
   1512 LInstruction* LChunkBuilder::DoIsObjectAndBranch(HIsObjectAndBranch* instr) {
   1513   ASSERT(instr->value()->representation().IsTagged());
   1514   LOperand* value = UseRegisterAtStart(instr->value());
   1515   LOperand* temp = TempRegister();
   1516   return new(zone()) LIsObjectAndBranch(value, temp);
   1517 }
   1518 
   1519 
   1520 LInstruction* LChunkBuilder::DoIsStringAndBranch(HIsStringAndBranch* instr) {
   1521   ASSERT(instr->value()->representation().IsTagged());
   1522   LOperand* value = UseRegisterAtStart(instr->value());
   1523   LOperand* temp = TempRegister();
   1524   return new(zone()) LIsStringAndBranch(value, temp);
   1525 }
   1526 
   1527 
   1528 LInstruction* LChunkBuilder::DoIsSmiAndBranch(HIsSmiAndBranch* instr) {
   1529   ASSERT(instr->value()->representation().IsTagged());
   1530   return new(zone()) LIsSmiAndBranch(Use(instr->value()));
   1531 }
   1532 
   1533 
   1534 LInstruction* LChunkBuilder::DoIsUndetectableAndBranch(
   1535     HIsUndetectableAndBranch* instr) {
   1536   ASSERT(instr->value()->representation().IsTagged());
   1537   LOperand* value = UseRegisterAtStart(instr->value());
   1538   return new(zone()) LIsUndetectableAndBranch(value, TempRegister());
   1539 }
   1540 
   1541 
   1542 LInstruction* LChunkBuilder::DoStringCompareAndBranch(
   1543     HStringCompareAndBranch* instr) {
   1544   ASSERT(instr->left()->representation().IsTagged());
   1545   ASSERT(instr->right()->representation().IsTagged());
   1546   LOperand* left = UseFixed(instr->left(), r1);
   1547   LOperand* right = UseFixed(instr->right(), r0);
   1548   LStringCompareAndBranch* result =
   1549       new(zone()) LStringCompareAndBranch(left, right);
   1550   return MarkAsCall(result, instr);
   1551 }
   1552 
   1553 
   1554 LInstruction* LChunkBuilder::DoHasInstanceTypeAndBranch(
   1555     HHasInstanceTypeAndBranch* instr) {
   1556   ASSERT(instr->value()->representation().IsTagged());
   1557   LOperand* value = UseRegisterAtStart(instr->value());
   1558   return new(zone()) LHasInstanceTypeAndBranch(value);
   1559 }
   1560 
   1561 
   1562 LInstruction* LChunkBuilder::DoGetCachedArrayIndex(
   1563     HGetCachedArrayIndex* instr)  {
   1564   ASSERT(instr->value()->representation().IsTagged());
   1565   LOperand* value = UseRegisterAtStart(instr->value());
   1566 
   1567   return DefineAsRegister(new(zone()) LGetCachedArrayIndex(value));
   1568 }
   1569 
   1570 
   1571 LInstruction* LChunkBuilder::DoHasCachedArrayIndexAndBranch(
   1572     HHasCachedArrayIndexAndBranch* instr) {
   1573   ASSERT(instr->value()->representation().IsTagged());
   1574   return new(zone()) LHasCachedArrayIndexAndBranch(
   1575       UseRegisterAtStart(instr->value()));
   1576 }
   1577 
   1578 
   1579 LInstruction* LChunkBuilder::DoClassOfTestAndBranch(
   1580     HClassOfTestAndBranch* instr) {
   1581   ASSERT(instr->value()->representation().IsTagged());
   1582   LOperand* value = UseRegister(instr->value());
   1583   return new(zone()) LClassOfTestAndBranch(value, TempRegister());
   1584 }
   1585 
   1586 
   1587 LInstruction* LChunkBuilder::DoJSArrayLength(HJSArrayLength* instr) {
   1588   LOperand* array = UseRegisterAtStart(instr->value());
   1589   return DefineAsRegister(new(zone()) LJSArrayLength(array));
   1590 }
   1591 
   1592 
   1593 LInstruction* LChunkBuilder::DoFixedArrayBaseLength(
   1594     HFixedArrayBaseLength* instr) {
   1595   LOperand* array = UseRegisterAtStart(instr->value());
   1596   return DefineAsRegister(new(zone()) LFixedArrayBaseLength(array));
   1597 }
   1598 
   1599 
   1600 LInstruction* LChunkBuilder::DoElementsKind(HElementsKind* instr) {
   1601   LOperand* object = UseRegisterAtStart(instr->value());
   1602   return DefineAsRegister(new(zone()) LElementsKind(object));
   1603 }
   1604 
   1605 
   1606 LInstruction* LChunkBuilder::DoValueOf(HValueOf* instr) {
   1607   LOperand* object = UseRegister(instr->value());
   1608   LValueOf* result = new(zone()) LValueOf(object, TempRegister());
   1609   return DefineAsRegister(result);
   1610 }
   1611 
   1612 
   1613 LInstruction* LChunkBuilder::DoDateField(HDateField* instr) {
   1614   LOperand* object = UseFixed(instr->value(), r0);
   1615   LDateField* result = new LDateField(object, FixedTemp(r1), instr->index());
   1616   return MarkAsCall(DefineFixed(result, r0), instr);
   1617 }
   1618 
   1619 
   1620 LInstruction* LChunkBuilder::DoBoundsCheck(HBoundsCheck* instr) {
   1621   LOperand* value = UseRegisterAtStart(instr->index());
   1622   LOperand* length = UseRegister(instr->length());
   1623   return AssignEnvironment(new(zone()) LBoundsCheck(value, length));
   1624 }
   1625 
   1626 
   1627 LInstruction* LChunkBuilder::DoAbnormalExit(HAbnormalExit* instr) {
   1628   // The control instruction marking the end of a block that completed
   1629   // abruptly (e.g., threw an exception).  There is nothing specific to do.
   1630   return NULL;
   1631 }
   1632 
   1633 
   1634 LInstruction* LChunkBuilder::DoThrow(HThrow* instr) {
   1635   LOperand* value = UseFixed(instr->value(), r0);
   1636   return MarkAsCall(new(zone()) LThrow(value), instr);
   1637 }
   1638 
   1639 
   1640 LInstruction* LChunkBuilder::DoUseConst(HUseConst* instr) {
   1641   return NULL;
   1642 }
   1643 
   1644 
   1645 LInstruction* LChunkBuilder::DoForceRepresentation(HForceRepresentation* bad) {
   1646   // All HForceRepresentation instructions should be eliminated in the
   1647   // representation change phase of Hydrogen.
   1648   UNREACHABLE();
   1649   return NULL;
   1650 }
   1651 
   1652 
   1653 LInstruction* LChunkBuilder::DoChange(HChange* instr) {
   1654   Representation from = instr->from();
   1655   Representation to = instr->to();
   1656   if (from.IsTagged()) {
   1657     if (to.IsDouble()) {
   1658       LOperand* value = UseRegister(instr->value());
   1659       LNumberUntagD* res = new(zone()) LNumberUntagD(value);
   1660       return AssignEnvironment(DefineAsRegister(res));
   1661     } else {
   1662       ASSERT(to.IsInteger32());
   1663       LOperand* value = UseRegisterAtStart(instr->value());
   1664       bool needs_check = !instr->value()->type().IsSmi();
   1665       LInstruction* res = NULL;
   1666       if (!needs_check) {
   1667         res = DefineAsRegister(new(zone()) LSmiUntag(value, needs_check));
   1668       } else {
   1669         LOperand* temp1 = TempRegister();
   1670         LOperand* temp2 = instr->CanTruncateToInt32() ? TempRegister()
   1671                                                       : NULL;
   1672         LOperand* temp3 = instr->CanTruncateToInt32() ? FixedTemp(d11)
   1673                                                       : NULL;
   1674         res = DefineSameAsFirst(new(zone()) LTaggedToI(value,
   1675                                                        temp1,
   1676                                                        temp2,
   1677                                                        temp3));
   1678         res = AssignEnvironment(res);
   1679       }
   1680       return res;
   1681     }
   1682   } else if (from.IsDouble()) {
   1683     if (to.IsTagged()) {
   1684       LOperand* value = UseRegister(instr->value());
   1685       LOperand* temp1 = TempRegister();
   1686       LOperand* temp2 = TempRegister();
   1687 
   1688       // Make sure that the temp and result_temp registers are
   1689       // different.
   1690       LUnallocated* result_temp = TempRegister();
   1691       LNumberTagD* result = new(zone()) LNumberTagD(value, temp1, temp2);
   1692       Define(result, result_temp);
   1693       return AssignPointerMap(result);
   1694     } else {
   1695       ASSERT(to.IsInteger32());
   1696       LOperand* value = UseRegister(instr->value());
   1697       LOperand* temp1 = TempRegister();
   1698       LOperand* temp2 = instr->CanTruncateToInt32() ? TempRegister() : NULL;
   1699       LDoubleToI* res = new(zone()) LDoubleToI(value, temp1, temp2);
   1700       return AssignEnvironment(DefineAsRegister(res));
   1701     }
   1702   } else if (from.IsInteger32()) {
   1703     if (to.IsTagged()) {
   1704       HValue* val = instr->value();
   1705       LOperand* value = UseRegisterAtStart(val);
   1706       if (val->HasRange() && val->range()->IsInSmiRange()) {
   1707         return DefineAsRegister(new(zone()) LSmiTag(value));
   1708       } else {
   1709         LNumberTagI* result = new(zone()) LNumberTagI(value);
   1710         return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
   1711       }
   1712     } else {
   1713       ASSERT(to.IsDouble());
   1714       LOperand* value = Use(instr->value());
   1715       return DefineAsRegister(new(zone()) LInteger32ToDouble(value));
   1716     }
   1717   }
   1718   UNREACHABLE();
   1719   return NULL;
   1720 }
   1721 
   1722 
   1723 LInstruction* LChunkBuilder::DoCheckNonSmi(HCheckNonSmi* instr) {
   1724   LOperand* value = UseRegisterAtStart(instr->value());
   1725   return AssignEnvironment(new(zone()) LCheckNonSmi(value));
   1726 }
   1727 
   1728 
   1729 LInstruction* LChunkBuilder::DoCheckInstanceType(HCheckInstanceType* instr) {
   1730   LOperand* value = UseRegisterAtStart(instr->value());
   1731   LInstruction* result = new(zone()) LCheckInstanceType(value);
   1732   return AssignEnvironment(result);
   1733 }
   1734 
   1735 
   1736 LInstruction* LChunkBuilder::DoCheckPrototypeMaps(HCheckPrototypeMaps* instr) {
   1737   LOperand* temp1 = TempRegister();
   1738   LOperand* temp2 = TempRegister();
   1739   LInstruction* result = new(zone()) LCheckPrototypeMaps(temp1, temp2);
   1740   return AssignEnvironment(result);
   1741 }
   1742 
   1743 
   1744 LInstruction* LChunkBuilder::DoCheckSmi(HCheckSmi* instr) {
   1745   LOperand* value = UseRegisterAtStart(instr->value());
   1746   return AssignEnvironment(new(zone()) LCheckSmi(value));
   1747 }
   1748 
   1749 
   1750 LInstruction* LChunkBuilder::DoCheckFunction(HCheckFunction* instr) {
   1751   LOperand* value = UseRegisterAtStart(instr->value());
   1752   return AssignEnvironment(new(zone()) LCheckFunction(value));
   1753 }
   1754 
   1755 
   1756 LInstruction* LChunkBuilder::DoCheckMap(HCheckMap* instr) {
   1757   LOperand* value = UseRegisterAtStart(instr->value());
   1758   LInstruction* result = new(zone()) LCheckMap(value);
   1759   return AssignEnvironment(result);
   1760 }
   1761 
   1762 
   1763 LInstruction* LChunkBuilder::DoClampToUint8(HClampToUint8* instr) {
   1764   HValue* value = instr->value();
   1765   Representation input_rep = value->representation();
   1766   LOperand* reg = UseRegister(value);
   1767   if (input_rep.IsDouble()) {
   1768     return DefineAsRegister(new(zone()) LClampDToUint8(reg, FixedTemp(d11)));
   1769   } else if (input_rep.IsInteger32()) {
   1770     return DefineAsRegister(new(zone()) LClampIToUint8(reg));
   1771   } else {
   1772     ASSERT(input_rep.IsTagged());
   1773     // Register allocator doesn't (yet) support allocation of double
   1774     // temps. Reserve d1 explicitly.
   1775     LClampTToUint8* result = new(zone()) LClampTToUint8(reg, FixedTemp(d11));
   1776     return AssignEnvironment(DefineAsRegister(result));
   1777   }
   1778 }
   1779 
   1780 
   1781 LInstruction* LChunkBuilder::DoReturn(HReturn* instr) {
   1782   return new(zone()) LReturn(UseFixed(instr->value(), r0));
   1783 }
   1784 
   1785 
   1786 LInstruction* LChunkBuilder::DoConstant(HConstant* instr) {
   1787   Representation r = instr->representation();
   1788   if (r.IsInteger32()) {
   1789     return DefineAsRegister(new(zone()) LConstantI);
   1790   } else if (r.IsDouble()) {
   1791     return DefineAsRegister(new(zone()) LConstantD);
   1792   } else if (r.IsTagged()) {
   1793     return DefineAsRegister(new(zone()) LConstantT);
   1794   } else {
   1795     UNREACHABLE();
   1796     return NULL;
   1797   }
   1798 }
   1799 
   1800 
   1801 LInstruction* LChunkBuilder::DoLoadGlobalCell(HLoadGlobalCell* instr) {
   1802   LLoadGlobalCell* result = new(zone()) LLoadGlobalCell;
   1803   return instr->RequiresHoleCheck()
   1804       ? AssignEnvironment(DefineAsRegister(result))
   1805       : DefineAsRegister(result);
   1806 }
   1807 
   1808 
   1809 LInstruction* LChunkBuilder::DoLoadGlobalGeneric(HLoadGlobalGeneric* instr) {
   1810   LOperand* global_object = UseFixed(instr->global_object(), r0);
   1811   LLoadGlobalGeneric* result = new(zone()) LLoadGlobalGeneric(global_object);
   1812   return MarkAsCall(DefineFixed(result, r0), instr);
   1813 }
   1814 
   1815 
   1816 LInstruction* LChunkBuilder::DoStoreGlobalCell(HStoreGlobalCell* instr) {
   1817   LOperand* value = UseRegister(instr->value());
   1818   // Use a temp to check the value in the cell in the case where we perform
   1819   // a hole check.
   1820   return instr->RequiresHoleCheck()
   1821       ? AssignEnvironment(new(zone()) LStoreGlobalCell(value, TempRegister()))
   1822       : new(zone()) LStoreGlobalCell(value, NULL);
   1823 }
   1824 
   1825 
   1826 LInstruction* LChunkBuilder::DoStoreGlobalGeneric(HStoreGlobalGeneric* instr) {
   1827   LOperand* global_object = UseFixed(instr->global_object(), r1);
   1828   LOperand* value = UseFixed(instr->value(), r0);
   1829   LStoreGlobalGeneric* result =
   1830       new(zone()) LStoreGlobalGeneric(global_object, value);
   1831   return MarkAsCall(result, instr);
   1832 }
   1833 
   1834 
   1835 LInstruction* LChunkBuilder::DoLoadContextSlot(HLoadContextSlot* instr) {
   1836   LOperand* context = UseRegisterAtStart(instr->value());
   1837   LInstruction* result =
   1838       DefineAsRegister(new(zone()) LLoadContextSlot(context));
   1839   return instr->RequiresHoleCheck() ? AssignEnvironment(result) : result;
   1840 }
   1841 
   1842 
   1843 LInstruction* LChunkBuilder::DoStoreContextSlot(HStoreContextSlot* instr) {
   1844   LOperand* context;
   1845   LOperand* value;
   1846   if (instr->NeedsWriteBarrier()) {
   1847     context = UseTempRegister(instr->context());
   1848     value = UseTempRegister(instr->value());
   1849   } else {
   1850     context = UseRegister(instr->context());
   1851     value = UseRegister(instr->value());
   1852   }
   1853   LInstruction* result = new(zone()) LStoreContextSlot(context, value);
   1854   return instr->RequiresHoleCheck() ? AssignEnvironment(result) : result;
   1855 }
   1856 
   1857 
   1858 LInstruction* LChunkBuilder::DoLoadNamedField(HLoadNamedField* instr) {
   1859   return DefineAsRegister(
   1860       new(zone()) LLoadNamedField(UseRegisterAtStart(instr->object())));
   1861 }
   1862 
   1863 
   1864 LInstruction* LChunkBuilder::DoLoadNamedFieldPolymorphic(
   1865     HLoadNamedFieldPolymorphic* instr) {
   1866   ASSERT(instr->representation().IsTagged());
   1867   if (instr->need_generic()) {
   1868     LOperand* obj = UseFixed(instr->object(), r0);
   1869     LLoadNamedFieldPolymorphic* result =
   1870         new(zone()) LLoadNamedFieldPolymorphic(obj);
   1871     return MarkAsCall(DefineFixed(result, r0), instr);
   1872   } else {
   1873     LOperand* obj = UseRegisterAtStart(instr->object());
   1874     LLoadNamedFieldPolymorphic* result =
   1875         new(zone()) LLoadNamedFieldPolymorphic(obj);
   1876     return AssignEnvironment(DefineAsRegister(result));
   1877   }
   1878 }
   1879 
   1880 
   1881 LInstruction* LChunkBuilder::DoLoadNamedGeneric(HLoadNamedGeneric* instr) {
   1882   LOperand* object = UseFixed(instr->object(), r0);
   1883   LInstruction* result = DefineFixed(new(zone()) LLoadNamedGeneric(object), r0);
   1884   return MarkAsCall(result, instr);
   1885 }
   1886 
   1887 
   1888 LInstruction* LChunkBuilder::DoLoadFunctionPrototype(
   1889     HLoadFunctionPrototype* instr) {
   1890   return AssignEnvironment(DefineAsRegister(
   1891       new(zone()) LLoadFunctionPrototype(UseRegister(instr->function()))));
   1892 }
   1893 
   1894 
   1895 LInstruction* LChunkBuilder::DoLoadElements(HLoadElements* instr) {
   1896   LOperand* input = UseRegisterAtStart(instr->value());
   1897   return DefineAsRegister(new(zone()) LLoadElements(input));
   1898 }
   1899 
   1900 
   1901 LInstruction* LChunkBuilder::DoLoadExternalArrayPointer(
   1902     HLoadExternalArrayPointer* instr) {
   1903   LOperand* input = UseRegisterAtStart(instr->value());
   1904   return DefineAsRegister(new(zone()) LLoadExternalArrayPointer(input));
   1905 }
   1906 
   1907 
   1908 LInstruction* LChunkBuilder::DoLoadKeyedFastElement(
   1909     HLoadKeyedFastElement* instr) {
   1910   ASSERT(instr->representation().IsTagged());
   1911   ASSERT(instr->key()->representation().IsInteger32());
   1912   LOperand* obj = UseRegisterAtStart(instr->object());
   1913   LOperand* key = UseRegisterAtStart(instr->key());
   1914   LLoadKeyedFastElement* result = new(zone()) LLoadKeyedFastElement(obj, key);
   1915   if (instr->RequiresHoleCheck()) AssignEnvironment(result);
   1916   return DefineAsRegister(result);
   1917 }
   1918 
   1919 
   1920 LInstruction* LChunkBuilder::DoLoadKeyedFastDoubleElement(
   1921     HLoadKeyedFastDoubleElement* instr) {
   1922   ASSERT(instr->representation().IsDouble());
   1923   ASSERT(instr->key()->representation().IsInteger32());
   1924   LOperand* elements = UseTempRegister(instr->elements());
   1925   LOperand* key = UseRegisterOrConstantAtStart(instr->key());
   1926   LLoadKeyedFastDoubleElement* result =
   1927       new(zone()) LLoadKeyedFastDoubleElement(elements, key);
   1928   return AssignEnvironment(DefineAsRegister(result));
   1929 }
   1930 
   1931 
   1932 LInstruction* LChunkBuilder::DoLoadKeyedSpecializedArrayElement(
   1933     HLoadKeyedSpecializedArrayElement* instr) {
   1934   ElementsKind elements_kind = instr->elements_kind();
   1935   ASSERT(
   1936       (instr->representation().IsInteger32() &&
   1937        (elements_kind != EXTERNAL_FLOAT_ELEMENTS) &&
   1938        (elements_kind != EXTERNAL_DOUBLE_ELEMENTS)) ||
   1939       (instr->representation().IsDouble() &&
   1940        ((elements_kind == EXTERNAL_FLOAT_ELEMENTS) ||
   1941        (elements_kind == EXTERNAL_DOUBLE_ELEMENTS))));
   1942   ASSERT(instr->key()->representation().IsInteger32());
   1943   LOperand* external_pointer = UseRegister(instr->external_pointer());
   1944   LOperand* key = UseRegisterOrConstant(instr->key());
   1945   LLoadKeyedSpecializedArrayElement* result =
   1946       new(zone()) LLoadKeyedSpecializedArrayElement(external_pointer, key);
   1947   LInstruction* load_instr = DefineAsRegister(result);
   1948   // An unsigned int array load might overflow and cause a deopt, make sure it
   1949   // has an environment.
   1950   return (elements_kind == EXTERNAL_UNSIGNED_INT_ELEMENTS) ?
   1951       AssignEnvironment(load_instr) : load_instr;
   1952 }
   1953 
   1954 
   1955 LInstruction* LChunkBuilder::DoLoadKeyedGeneric(HLoadKeyedGeneric* instr) {
   1956   LOperand* object = UseFixed(instr->object(), r1);
   1957   LOperand* key = UseFixed(instr->key(), r0);
   1958 
   1959   LInstruction* result =
   1960       DefineFixed(new(zone()) LLoadKeyedGeneric(object, key), r0);
   1961   return MarkAsCall(result, instr);
   1962 }
   1963 
   1964 
   1965 LInstruction* LChunkBuilder::DoStoreKeyedFastElement(
   1966     HStoreKeyedFastElement* instr) {
   1967   bool needs_write_barrier = instr->NeedsWriteBarrier();
   1968   ASSERT(instr->value()->representation().IsTagged());
   1969   ASSERT(instr->object()->representation().IsTagged());
   1970   ASSERT(instr->key()->representation().IsInteger32());
   1971 
   1972   LOperand* obj = UseTempRegister(instr->object());
   1973   LOperand* val = needs_write_barrier
   1974       ? UseTempRegister(instr->value())
   1975       : UseRegisterAtStart(instr->value());
   1976   LOperand* key = needs_write_barrier
   1977       ? UseTempRegister(instr->key())
   1978       : UseRegisterOrConstantAtStart(instr->key());
   1979   return new(zone()) LStoreKeyedFastElement(obj, key, val);
   1980 }
   1981 
   1982 
   1983 LInstruction* LChunkBuilder::DoStoreKeyedFastDoubleElement(
   1984     HStoreKeyedFastDoubleElement* instr) {
   1985   ASSERT(instr->value()->representation().IsDouble());
   1986   ASSERT(instr->elements()->representation().IsTagged());
   1987   ASSERT(instr->key()->representation().IsInteger32());
   1988 
   1989   LOperand* elements = UseRegisterAtStart(instr->elements());
   1990   LOperand* val = UseTempRegister(instr->value());
   1991   LOperand* key = UseRegisterOrConstantAtStart(instr->key());
   1992 
   1993   return new(zone()) LStoreKeyedFastDoubleElement(elements, key, val);
   1994 }
   1995 
   1996 
   1997 LInstruction* LChunkBuilder::DoStoreKeyedSpecializedArrayElement(
   1998     HStoreKeyedSpecializedArrayElement* instr) {
   1999   ElementsKind elements_kind = instr->elements_kind();
   2000   ASSERT(
   2001       (instr->value()->representation().IsInteger32() &&
   2002        (elements_kind != EXTERNAL_FLOAT_ELEMENTS) &&
   2003        (elements_kind != EXTERNAL_DOUBLE_ELEMENTS)) ||
   2004       (instr->value()->representation().IsDouble() &&
   2005        ((elements_kind == EXTERNAL_FLOAT_ELEMENTS) ||
   2006        (elements_kind == EXTERNAL_DOUBLE_ELEMENTS))));
   2007   ASSERT(instr->external_pointer()->representation().IsExternal());
   2008   ASSERT(instr->key()->representation().IsInteger32());
   2009 
   2010   LOperand* external_pointer = UseRegister(instr->external_pointer());
   2011   bool val_is_temp_register =
   2012       elements_kind == EXTERNAL_PIXEL_ELEMENTS ||
   2013       elements_kind == EXTERNAL_FLOAT_ELEMENTS;
   2014   LOperand* val = val_is_temp_register
   2015       ? UseTempRegister(instr->value())
   2016       : UseRegister(instr->value());
   2017   LOperand* key = UseRegisterOrConstant(instr->key());
   2018 
   2019   return new(zone()) LStoreKeyedSpecializedArrayElement(external_pointer,
   2020                                                         key,
   2021                                                         val);
   2022 }
   2023 
   2024 
   2025 LInstruction* LChunkBuilder::DoStoreKeyedGeneric(HStoreKeyedGeneric* instr) {
   2026   LOperand* obj = UseFixed(instr->object(), r2);
   2027   LOperand* key = UseFixed(instr->key(), r1);
   2028   LOperand* val = UseFixed(instr->value(), r0);
   2029 
   2030   ASSERT(instr->object()->representation().IsTagged());
   2031   ASSERT(instr->key()->representation().IsTagged());
   2032   ASSERT(instr->value()->representation().IsTagged());
   2033 
   2034   return MarkAsCall(new(zone()) LStoreKeyedGeneric(obj, key, val), instr);
   2035 }
   2036 
   2037 
   2038 LInstruction* LChunkBuilder::DoTransitionElementsKind(
   2039     HTransitionElementsKind* instr) {
   2040   if (instr->original_map()->elements_kind() == FAST_SMI_ONLY_ELEMENTS &&
   2041       instr->transitioned_map()->elements_kind() == FAST_ELEMENTS) {
   2042     LOperand* object = UseRegister(instr->object());
   2043     LOperand* new_map_reg = TempRegister();
   2044     LTransitionElementsKind* result =
   2045         new(zone()) LTransitionElementsKind(object, new_map_reg, NULL);
   2046     return DefineSameAsFirst(result);
   2047   } else {
   2048     LOperand* object = UseFixed(instr->object(), r0);
   2049     LOperand* fixed_object_reg = FixedTemp(r2);
   2050     LOperand* new_map_reg = FixedTemp(r3);
   2051     LTransitionElementsKind* result =
   2052         new(zone()) LTransitionElementsKind(object,
   2053                                             new_map_reg,
   2054                                             fixed_object_reg);
   2055     return MarkAsCall(DefineFixed(result, r0), instr);
   2056   }
   2057 }
   2058 
   2059 
   2060 LInstruction* LChunkBuilder::DoStoreNamedField(HStoreNamedField* instr) {
   2061   bool needs_write_barrier = instr->NeedsWriteBarrier();
   2062 
   2063   LOperand* obj = needs_write_barrier
   2064       ? UseTempRegister(instr->object())
   2065       : UseRegisterAtStart(instr->object());
   2066 
   2067   LOperand* val = needs_write_barrier
   2068       ? UseTempRegister(instr->value())
   2069       : UseRegister(instr->value());
   2070 
   2071   return new(zone()) LStoreNamedField(obj, val);
   2072 }
   2073 
   2074 
   2075 LInstruction* LChunkBuilder::DoStoreNamedGeneric(HStoreNamedGeneric* instr) {
   2076   LOperand* obj = UseFixed(instr->object(), r1);
   2077   LOperand* val = UseFixed(instr->value(), r0);
   2078 
   2079   LInstruction* result = new(zone()) LStoreNamedGeneric(obj, val);
   2080   return MarkAsCall(result, instr);
   2081 }
   2082 
   2083 
   2084 LInstruction* LChunkBuilder::DoStringAdd(HStringAdd* instr) {
   2085   LOperand* left = UseRegisterAtStart(instr->left());
   2086   LOperand* right = UseRegisterAtStart(instr->right());
   2087   return MarkAsCall(DefineFixed(new(zone()) LStringAdd(left, right), r0),
   2088                     instr);
   2089 }
   2090 
   2091 
   2092 LInstruction* LChunkBuilder::DoStringCharCodeAt(HStringCharCodeAt* instr) {
   2093   LOperand* string = UseTempRegister(instr->string());
   2094   LOperand* index = UseTempRegister(instr->index());
   2095   LStringCharCodeAt* result = new(zone()) LStringCharCodeAt(string, index);
   2096   return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
   2097 }
   2098 
   2099 
   2100 LInstruction* LChunkBuilder::DoStringCharFromCode(HStringCharFromCode* instr) {
   2101   LOperand* char_code = UseRegister(instr->value());
   2102   LStringCharFromCode* result = new(zone()) LStringCharFromCode(char_code);
   2103   return AssignPointerMap(DefineAsRegister(result));
   2104 }
   2105 
   2106 
   2107 LInstruction* LChunkBuilder::DoStringLength(HStringLength* instr) {
   2108   LOperand* string = UseRegisterAtStart(instr->value());
   2109   return DefineAsRegister(new(zone()) LStringLength(string));
   2110 }
   2111 
   2112 
   2113 LInstruction* LChunkBuilder::DoAllocateObject(HAllocateObject* instr) {
   2114   LAllocateObject* result = new LAllocateObject(TempRegister(), TempRegister());
   2115   return AssignPointerMap(DefineAsRegister(result));
   2116 }
   2117 
   2118 
   2119 LInstruction* LChunkBuilder::DoFastLiteral(HFastLiteral* instr) {
   2120   return MarkAsCall(DefineFixed(new(zone()) LFastLiteral, r0), instr);
   2121 }
   2122 
   2123 
   2124 LInstruction* LChunkBuilder::DoArrayLiteral(HArrayLiteral* instr) {
   2125   return MarkAsCall(DefineFixed(new(zone()) LArrayLiteral, r0), instr);
   2126 }
   2127 
   2128 
   2129 LInstruction* LChunkBuilder::DoObjectLiteral(HObjectLiteral* instr) {
   2130   return MarkAsCall(DefineFixed(new(zone()) LObjectLiteral, r0), instr);
   2131 }
   2132 
   2133 
   2134 LInstruction* LChunkBuilder::DoRegExpLiteral(HRegExpLiteral* instr) {
   2135   return MarkAsCall(DefineFixed(new(zone()) LRegExpLiteral, r0), instr);
   2136 }
   2137 
   2138 
   2139 LInstruction* LChunkBuilder::DoFunctionLiteral(HFunctionLiteral* instr) {
   2140   return MarkAsCall(DefineFixed(new(zone()) LFunctionLiteral, r0), instr);
   2141 }
   2142 
   2143 
   2144 LInstruction* LChunkBuilder::DoDeleteProperty(HDeleteProperty* instr) {
   2145   LOperand* object = UseFixed(instr->object(), r0);
   2146   LOperand* key = UseFixed(instr->key(), r1);
   2147   LDeleteProperty* result = new(zone()) LDeleteProperty(object, key);
   2148   return MarkAsCall(DefineFixed(result, r0), instr);
   2149 }
   2150 
   2151 
   2152 LInstruction* LChunkBuilder::DoOsrEntry(HOsrEntry* instr) {
   2153   allocator_->MarkAsOsrEntry();
   2154   current_block_->last_environment()->set_ast_id(instr->ast_id());
   2155   return AssignEnvironment(new(zone()) LOsrEntry);
   2156 }
   2157 
   2158 
   2159 LInstruction* LChunkBuilder::DoParameter(HParameter* instr) {
   2160   int spill_index = chunk()->GetParameterStackSlot(instr->index());
   2161   return DefineAsSpilled(new(zone()) LParameter, spill_index);
   2162 }
   2163 
   2164 
   2165 LInstruction* LChunkBuilder::DoUnknownOSRValue(HUnknownOSRValue* instr) {
   2166   int spill_index = chunk()->GetNextSpillIndex(false);  // Not double-width.
   2167   if (spill_index > LUnallocated::kMaxFixedIndex) {
   2168     Abort("Too many spill slots needed for OSR");
   2169     spill_index = 0;
   2170   }
   2171   return DefineAsSpilled(new(zone()) LUnknownOSRValue, spill_index);
   2172 }
   2173 
   2174 
   2175 LInstruction* LChunkBuilder::DoCallStub(HCallStub* instr) {
   2176   argument_count_ -= instr->argument_count();
   2177   return MarkAsCall(DefineFixed(new(zone()) LCallStub, r0), instr);
   2178 }
   2179 
   2180 
   2181 LInstruction* LChunkBuilder::DoArgumentsObject(HArgumentsObject* instr) {
   2182   // There are no real uses of the arguments object.
   2183   // arguments.length and element access are supported directly on
   2184   // stack arguments, and any real arguments object use causes a bailout.
   2185   // So this value is never used.
   2186   return NULL;
   2187 }
   2188 
   2189 
   2190 LInstruction* LChunkBuilder::DoAccessArgumentsAt(HAccessArgumentsAt* instr) {
   2191   LOperand* arguments = UseRegister(instr->arguments());
   2192   LOperand* length = UseTempRegister(instr->length());
   2193   LOperand* index = UseRegister(instr->index());
   2194   LAccessArgumentsAt* result =
   2195       new(zone()) LAccessArgumentsAt(arguments, length, index);
   2196   return AssignEnvironment(DefineAsRegister(result));
   2197 }
   2198 
   2199 
   2200 LInstruction* LChunkBuilder::DoToFastProperties(HToFastProperties* instr) {
   2201   LOperand* object = UseFixed(instr->value(), r0);
   2202   LToFastProperties* result = new(zone()) LToFastProperties(object);
   2203   return MarkAsCall(DefineFixed(result, r0), instr);
   2204 }
   2205 
   2206 
   2207 LInstruction* LChunkBuilder::DoTypeof(HTypeof* instr) {
   2208   LTypeof* result = new(zone()) LTypeof(UseFixed(instr->value(), r0));
   2209   return MarkAsCall(DefineFixed(result, r0), instr);
   2210 }
   2211 
   2212 
   2213 LInstruction* LChunkBuilder::DoTypeofIsAndBranch(HTypeofIsAndBranch* instr) {
   2214   return new(zone()) LTypeofIsAndBranch(UseTempRegister(instr->value()));
   2215 }
   2216 
   2217 
   2218 LInstruction* LChunkBuilder::DoIsConstructCallAndBranch(
   2219     HIsConstructCallAndBranch* instr) {
   2220   return new(zone()) LIsConstructCallAndBranch(TempRegister());
   2221 }
   2222 
   2223 
   2224 LInstruction* LChunkBuilder::DoSimulate(HSimulate* instr) {
   2225   HEnvironment* env = current_block_->last_environment();
   2226   ASSERT(env != NULL);
   2227 
   2228   env->set_ast_id(instr->ast_id());
   2229 
   2230   env->Drop(instr->pop_count());
   2231   for (int i = 0; i < instr->values()->length(); ++i) {
   2232     HValue* value = instr->values()->at(i);
   2233     if (instr->HasAssignedIndexAt(i)) {
   2234       env->Bind(instr->GetAssignedIndexAt(i), value);
   2235     } else {
   2236       env->Push(value);
   2237     }
   2238   }
   2239 
   2240   // If there is an instruction pending deoptimization environment create a
   2241   // lazy bailout instruction to capture the environment.
   2242   if (pending_deoptimization_ast_id_ == instr->ast_id()) {
   2243     LInstruction* result = new(zone()) LLazyBailout;
   2244     result = AssignEnvironment(result);
   2245     instruction_pending_deoptimization_environment_->
   2246         set_deoptimization_environment(result->environment());
   2247     ClearInstructionPendingDeoptimizationEnvironment();
   2248     return result;
   2249   }
   2250 
   2251   return NULL;
   2252 }
   2253 
   2254 
   2255 LInstruction* LChunkBuilder::DoStackCheck(HStackCheck* instr) {
   2256   if (instr->is_function_entry()) {
   2257     return MarkAsCall(new(zone()) LStackCheck, instr);
   2258   } else {
   2259     ASSERT(instr->is_backwards_branch());
   2260     return AssignEnvironment(AssignPointerMap(new(zone()) LStackCheck));
   2261   }
   2262 }
   2263 
   2264 
   2265 LInstruction* LChunkBuilder::DoEnterInlined(HEnterInlined* instr) {
   2266   HEnvironment* outer = current_block_->last_environment();
   2267   HConstant* undefined = graph()->GetConstantUndefined();
   2268   HEnvironment* inner = outer->CopyForInlining(instr->closure(),
   2269                                                instr->arguments_count(),
   2270                                                instr->function(),
   2271                                                undefined,
   2272                                                instr->call_kind(),
   2273                                                instr->is_construct());
   2274   if (instr->arguments() != NULL) {
   2275     inner->Bind(instr->arguments(), graph()->GetArgumentsObject());
   2276   }
   2277   current_block_->UpdateEnvironment(inner);
   2278   chunk_->AddInlinedClosure(instr->closure());
   2279   return NULL;
   2280 }
   2281 
   2282 
   2283 LInstruction* LChunkBuilder::DoLeaveInlined(HLeaveInlined* instr) {
   2284   HEnvironment* outer = current_block_->last_environment()->
   2285       DiscardInlined(false);
   2286   current_block_->UpdateEnvironment(outer);
   2287   return NULL;
   2288 }
   2289 
   2290 
   2291 LInstruction* LChunkBuilder::DoIn(HIn* instr) {
   2292   LOperand* key = UseRegisterAtStart(instr->key());
   2293   LOperand* object = UseRegisterAtStart(instr->object());
   2294   LIn* result = new(zone()) LIn(key, object);
   2295   return MarkAsCall(DefineFixed(result, r0), instr);
   2296 }
   2297 
   2298 
   2299 LInstruction* LChunkBuilder::DoForInPrepareMap(HForInPrepareMap* instr) {
   2300   LOperand* object = UseFixed(instr->enumerable(), r0);
   2301   LForInPrepareMap* result = new(zone()) LForInPrepareMap(object);
   2302   return MarkAsCall(DefineFixed(result, r0), instr, CAN_DEOPTIMIZE_EAGERLY);
   2303 }
   2304 
   2305 
   2306 LInstruction* LChunkBuilder::DoForInCacheArray(HForInCacheArray* instr) {
   2307   LOperand* map = UseRegister(instr->map());
   2308   return AssignEnvironment(DefineAsRegister(
   2309       new(zone()) LForInCacheArray(map)));
   2310 }
   2311 
   2312 
   2313 LInstruction* LChunkBuilder::DoCheckMapValue(HCheckMapValue* instr) {
   2314   LOperand* value = UseRegisterAtStart(instr->value());
   2315   LOperand* map = UseRegisterAtStart(instr->map());
   2316   return AssignEnvironment(new(zone()) LCheckMapValue(value, map));
   2317 }
   2318 
   2319 
   2320 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
   2321   LOperand* object = UseRegister(instr->object());
   2322   LOperand* index = UseRegister(instr->index());
   2323   return DefineAsRegister(new(zone()) LLoadFieldByIndex(object, index));
   2324 }
   2325 
   2326 
   2327 } }  // namespace v8::internal
   2328