Use register allocator for context on x64.

src/x64/lithium-codegen-x64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 248 matching lines @@
       Comment(";;; jump table entry %d.", i);
     } else {
       Comment(";;; jump table entry %d: deoptimization bailout %d.", i, id);
     }
     if (jump_table_[i].needs_frame) {
       __ movq(kScratchRegister, ExternalReference::ForDeoptEntry(entry));
       if (needs_frame.is_bound()) {
         __ jmp(&needs_frame);
       } else {
         __ bind(&needs_frame);
+        __ movq(rsi, MemOperand(rbp, StandardFrameConstants::kContextOffset));
         __ push(rbp);
         __ movq(rbp, rsp);
         __ push(rsi);
         // This variant of deopt can only be used with stubs. Since we don't
         // have a function pointer to install in the stack frame that we're
         // building, install a special marker there instead.
         ASSERT(info()->IsStub());
         __ Move(rsi, Smi::FromInt(StackFrame::STUB));
         __ push(rsi);
         __ movq(rsi, MemOperand(rsp, kPointerSize));
@@ skipping 303 matching lines @@
                            SaveFPRegsMode save_doubles) {
   ASSERT(instr != NULL);
   ASSERT(instr->HasPointerMap());
 
   __ CallRuntime(function, num_arguments, save_doubles);
 
   RecordSafepointWithLazyDeopt(instr, RECORD_SIMPLE_SAFEPOINT, 0);
 }
 
 
+void LCodeGen::LoadContextFromDeferred(LOperand* context) {
+  if (context->IsRegister()) {
+    if (!ToRegister(context).is(rsi)) {
+      __ movq(rsi, ToRegister(context));
+    }
+  } else if (context->IsStackSlot()) {
+    __ movq(rsi, ToOperand(context));
+  } else if (context->IsConstantOperand()) {
+    HConstant* constant =
+        chunk_->LookupConstant(LConstantOperand::cast(context));
+    __ Move(rsi, Handle<Object>::cast(constant->handle(isolate())));
+  } else {
+    UNREACHABLE();
+  }
+}
+
+
+
 void LCodeGen::CallRuntimeFromDeferred(Runtime::FunctionId id,
                                        int argc,
-                                       LInstruction* instr) {
-  __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
+                                       LInstruction* instr,
+                                       LOperand* context) {
+  LoadContextFromDeferred(context);
+
   __ CallRuntimeSaveDoubles(id);
   RecordSafepointWithRegisters(
       instr->pointer_map(), argc, Safepoint::kNoLazyDeopt);
 }
 
 
 void LCodeGen::RegisterEnvironmentForDeoptimization(LEnvironment* environment,
                                                     Safepoint::DeoptMode mode) {
   if (!environment->HasBeenRegistered()) {
     // Physical stack frame layout:
@@ skipping 203 matching lines @@
   Safepoint safepoint = safepoints_.DefineSafepoint(masm(),
       kind, arguments, deopt_mode);
   for (int i = 0; i < operands->length(); i++) {
     LOperand* pointer = operands->at(i);
     if (pointer->IsStackSlot()) {
       safepoint.DefinePointerSlot(pointer->index(), zone());
     } else if (pointer->IsRegister() && (kind & Safepoint::kWithRegisters)) {
       safepoint.DefinePointerRegister(ToRegister(pointer), zone());
     }
   }
-  if (kind & Safepoint::kWithRegisters) {
-    // Register rsi always contains a pointer to the context.
-    safepoint.DefinePointerRegister(rsi, zone());
-  }
 }
 
 
 void LCodeGen::RecordSafepoint(LPointerMap* pointers,
                                Safepoint::DeoptMode deopt_mode) {
   RecordSafepoint(pointers, Safepoint::kSimple, 0, deopt_mode);
 }
 
 
 void LCodeGen::RecordSafepoint(Safepoint::DeoptMode deopt_mode) {
@@ skipping 55 matching lines @@
   DoGap(instr);
 }
 
 
 void LCodeGen::DoParameter(LParameter* instr) {
   // Nothing to do.
 }
 
 
 void LCodeGen::DoCallStub(LCallStub* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   ASSERT(ToRegister(instr->result()).is(rax));
   switch (instr->hydrogen()->major_key()) {
     case CodeStub::RegExpConstructResult: {
       RegExpConstructResultStub stub;
       CallCode(stub.GetCode(isolate()), RelocInfo::CODE_TARGET, instr);
       break;
     }
     case CodeStub::RegExpExec: {
       RegExpExecStub stub;
       CallCode(stub.GetCode(isolate()), RelocInfo::CODE_TARGET, instr);
@@ skipping 711 matching lines @@
       __ j(not_equal, &runtime, Label::kNear);
       __ movq(result, FieldOperand(object, JSDate::kValueOffset +
                                            kPointerSize * index->value()));
       __ jmp(&done);
     }
     __ bind(&runtime);
     __ PrepareCallCFunction(2);
     __ movq(arg_reg_1, object);
     __ movq(arg_reg_2, index, RelocInfo::NONE64);
     __ CallCFunction(ExternalReference::get_date_field_function(isolate()), 2);
-    __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
     __ bind(&done);
   }
 }
 
 
 void LCodeGen::DoSeqStringSetChar(LSeqStringSetChar* instr) {
   Register string = ToRegister(instr->string());
   Register index = ToRegister(instr->index());
   Register value = ToRegister(instr->value());
   String::Encoding encoding = instr->encoding();
@@ skipping 17 matching lines @@
             value);
   } else {
     __ movw(FieldOperand(string, index, times_2, SeqString::kHeaderSize),
             value);
   }
 }
 
 
 void LCodeGen::DoThrow(LThrow* instr) {
   __ push(ToRegister(instr->value()));
+  ASSERT(ToRegister(instr->context()).is(rsi));
   CallRuntime(Runtime::kThrow, 1, instr);
 
   if (FLAG_debug_code) {
     Comment("Unreachable code.");
     __ int3();
   }
 }
 
 
 void LCodeGen::DoAddI(LAddI* instr) {
@@ skipping 134 matching lines @@
       // when there is a mulsd depending on the result
       __ movaps(left, left);
       break;
     case Token::MOD: {
       XMMRegister xmm_scratch = double_scratch0();
       __ PrepareCallCFunction(2);
       __ movaps(xmm_scratch, left);
       ASSERT(right.is(xmm1));
       __ CallCFunction(
           ExternalReference::double_fp_operation(Token::MOD, isolate()), 2);
-      __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
       __ movaps(result, xmm_scratch);
       break;
     }
     default:
       UNREACHABLE();
       break;
   }
 }
 
 
 void LCodeGen::DoArithmeticT(LArithmeticT* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   ASSERT(ToRegister(instr->left()).is(rdx));
   ASSERT(ToRegister(instr->right()).is(rax));
   ASSERT(ToRegister(instr->result()).is(rax));
 
   BinaryOpStub stub(instr->op(), NO_OVERWRITE);
   CallCode(stub.GetCode(isolate()), RelocInfo::CODE_TARGET, instr);
   __ nop();  // Signals no inlined code.
 }
 
 
@@ skipping 394 matching lines @@
     __ JumpIfSmi(input, instr->FalseLabel(chunk_));
   }
   __ movq(temp, FieldOperand(input, HeapObject::kMapOffset));
   __ testb(FieldOperand(temp, Map::kBitFieldOffset),
            Immediate(1 << Map::kIsUndetectable));
   EmitBranch(instr, not_zero);
 }
 
 
 void LCodeGen::DoStringCompareAndBranch(LStringCompareAndBranch* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   Token::Value op = instr->op();
 
   Handle<Code> ic = CompareIC::GetUninitialized(isolate(), op);
   CallCode(ic, RelocInfo::CODE_TARGET, instr);
 
   Condition condition = TokenToCondition(op, false);
   __ testq(rax, rax);
 
   EmitBranch(instr, condition);
 }
@@ skipping 136 matching lines @@
 
 void LCodeGen::DoCmpMapAndBranch(LCmpMapAndBranch* instr) {
   Register reg = ToRegister(instr->value());
 
   __ Cmp(FieldOperand(reg, HeapObject::kMapOffset), instr->map());
   EmitBranch(instr, equal);
 }
 
 
 void LCodeGen::DoInstanceOf(LInstanceOf* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   InstanceofStub stub(InstanceofStub::kNoFlags);
   __ push(ToRegister(instr->left()));
   __ push(ToRegister(instr->right()));
   CallCode(stub.GetCode(isolate()), RelocInfo::CODE_TARGET, instr);
   Label true_value, done;
   __ testq(rax, rax);
   __ j(zero, &true_value, Label::kNear);
   __ LoadRoot(ToRegister(instr->result()), Heap::kFalseValueRootIndex);
   __ jmp(&done, Label::kNear);
   __ bind(&true_value);
@@ skipping 11 matching lines @@
     virtual void Generate() V8_OVERRIDE {
       codegen()->DoDeferredInstanceOfKnownGlobal(instr_, &map_check_);
     }
     virtual LInstruction* instr() V8_OVERRIDE { return instr_; }
     Label* map_check() { return &map_check_; }
    private:
     LInstanceOfKnownGlobal* instr_;
     Label map_check_;
   };
 
-
+  ASSERT(ToRegister(instr->context()).is(rsi));
   DeferredInstanceOfKnownGlobal* deferred;
   deferred = new(zone()) DeferredInstanceOfKnownGlobal(this, instr);
 
   Label done, false_result;
   Register object = ToRegister(instr->value());
 
   // A Smi is not an instance of anything.
   __ JumpIfSmi(object, &false_result);
 
   // This is the inlined call site instanceof cache. The two occurences of the
@@ skipping 74 matching lines @@
   __ j(not_zero, &load_false);
   __ LoadRoot(rax, Heap::kTrueValueRootIndex);
   __ jmp(&done);
   __ bind(&load_false);
   __ LoadRoot(rax, Heap::kFalseValueRootIndex);
   __ bind(&done);
 }
 
 
 void LCodeGen::DoCmpT(LCmpT* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   Token::Value op = instr->op();
 
   Handle<Code> ic = CompareIC::GetUninitialized(isolate(), op);
   CallCode(ic, RelocInfo::CODE_TARGET, instr);
 
   Condition condition = TokenToCondition(op, false);
   Label true_value, done;
   __ testq(rax, rax);
   __ j(condition, &true_value, Label::kNear);
   __ LoadRoot(ToRegister(instr->result()), Heap::kFalseValueRootIndex);
   __ jmp(&done, Label::kNear);
   __ bind(&true_value);
   __ LoadRoot(ToRegister(instr->result()), Heap::kTrueValueRootIndex);
   __ bind(&done);
 }
 
 
 void LCodeGen::DoReturn(LReturn* instr) {
   if (FLAG_trace && info()->IsOptimizing()) {
-    // Preserve the return value on the stack and rely on the runtime
-    // call to return the value in the same register.
+    // Preserve the return value on the stack and rely on the runtime call
+    // to return the value in the same register.  We're leaving the code
+    // managed by the register allocator and tearing down the frame, it's
+    // safe to write to the context register.
     __ push(rax);
+    __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
     __ CallRuntime(Runtime::kTraceExit, 1);
   }
   if (info()->saves_caller_doubles()) {
     ASSERT(NeedsEagerFrame());
     BitVector* doubles = chunk()->allocated_double_registers();
     BitVector::Iterator save_iterator(doubles);
     int count = 0;
     while (!save_iterator.Done()) {
       __ movsd(XMMRegister::FromAllocationIndex(save_iterator.Current()),
                MemOperand(rsp, count * kDoubleSize));
@@ skipping 30 matching lines @@
   Register result = ToRegister(instr->result());
   __ LoadGlobalCell(result, instr->hydrogen()->cell().handle());
   if (instr->hydrogen()->RequiresHoleCheck()) {
     __ CompareRoot(result, Heap::kTheHoleValueRootIndex);
     DeoptimizeIf(equal, instr->environment());
   }
 }
 
 
 void LCodeGen::DoLoadGlobalGeneric(LLoadGlobalGeneric* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   ASSERT(ToRegister(instr->global_object()).is(rax));
   ASSERT(ToRegister(instr->result()).is(rax));
 
   __ Move(rcx, instr->name());
   RelocInfo::Mode mode = instr->for_typeof() ? RelocInfo::CODE_TARGET :
                                                RelocInfo::CODE_TARGET_CONTEXT;
   Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
   CallCode(ic, mode, instr);
 }
 
@@ skipping 18 matching lines @@
   } else {
     // Store the value.
     __ movq(kScratchRegister, cell_handle, RelocInfo::CELL);
     __ movq(Operand(kScratchRegister, 0), value);
   }
   // Cells are always rescanned, so no write barrier here.
 }
 
 
 void LCodeGen::DoStoreGlobalGeneric(LStoreGlobalGeneric* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   ASSERT(ToRegister(instr->global_object()).is(rdx));
   ASSERT(ToRegister(instr->value()).is(rax));
 
   __ Move(rcx, instr->name());
   Handle<Code> ic = (instr->strict_mode_flag() == kStrictMode)
       ? isolate()->builtins()->StoreIC_Initialize_Strict()
       : isolate()->builtins()->StoreIC_Initialize();
   CallCode(ic, RelocInfo::CODE_TARGET_CONTEXT, instr);
 }
 
@@ skipping 79 matching lines @@
   Register result = ToRegister(instr->result());
   if (!access.IsInobject()) {
     __ movq(result, FieldOperand(object, JSObject::kPropertiesOffset));
     object = result;
   }
   __ Load(result, FieldOperand(object, offset), access.representation());
 }
 
 
 void LCodeGen::DoLoadNamedGeneric(LLoadNamedGeneric* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   ASSERT(ToRegister(instr->object()).is(rax));
   ASSERT(ToRegister(instr->result()).is(rax));
 
   __ Move(rcx, instr->name());
   Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize();
   CallCode(ic, RelocInfo::CODE_TARGET, instr);
 }
 
 
 void LCodeGen::DoLoadFunctionPrototype(LLoadFunctionPrototype* instr) {
@@ skipping 259 matching lines @@
     ScaleFactor scale_factor = static_cast<ScaleFactor>(shift_size);
     return Operand(elements_pointer_reg,
                    ToRegister(key),
                    scale_factor,
                    offset + (additional_index << shift_size));
   }
 }
 
 
 void LCodeGen::DoLoadKeyedGeneric(LLoadKeyedGeneric* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   ASSERT(ToRegister(instr->object()).is(rdx));
   ASSERT(ToRegister(instr->key()).is(rax));
 
   Handle<Code> ic = isolate()->builtins()->KeyedLoadIC_Initialize();
   CallCode(ic, RelocInfo::CODE_TARGET, instr);
 }
 
 
 void LCodeGen::DoArgumentsElements(LArgumentsElements* instr) {
   Register result = ToRegister(instr->result());
@@ skipping 82 matching lines @@
   Condition is_smi = __ CheckSmi(receiver);
   DeoptimizeIf(is_smi, instr->environment());
   __ CmpObjectType(receiver, FIRST_SPEC_OBJECT_TYPE, kScratchRegister);
   DeoptimizeIf(below, instr->environment());
   __ jmp(&receiver_ok, Label::kNear);
 
   __ bind(&global_object);
   // TODO(kmillikin): We have a hydrogen value for the global object.  See
   // if it's better to use it than to explicitly fetch it from the context
   // here.
-  __ movq(receiver, ContextOperand(rsi, Context::GLOBAL_OBJECT_INDEX));
+  __ movq(receiver, Operand(rbp, StandardFrameConstants::kContextOffset));
+  __ movq(receiver, ContextOperand(receiver, Context::GLOBAL_OBJECT_INDEX));
   __ movq(receiver,
           FieldOperand(receiver, JSGlobalObject::kGlobalReceiverOffset));
   __ bind(&receiver_ok);
 }
 
 
 void LCodeGen::DoApplyArguments(LApplyArguments* instr) {
   Register receiver = ToRegister(instr->receiver());
   Register function = ToRegister(instr->function());
   Register length = ToRegister(instr->length());
@@ skipping 26 matching lines @@
 
   // Invoke the function.
   __ bind(&invoke);
   ASSERT(instr->HasPointerMap());
   LPointerMap* pointers = instr->pointer_map();
   SafepointGenerator safepoint_generator(
       this, pointers, Safepoint::kLazyDeopt);
   ParameterCount actual(rax);
   __ InvokeFunction(function, actual, CALL_FUNCTION,
                     safepoint_generator, CALL_AS_METHOD);
-  __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
 }
 
 
 void LCodeGen::DoPushArgument(LPushArgument* instr) {
   LOperand* argument = instr->value();
   EmitPushTaggedOperand(argument);
 }
 
 
 void LCodeGen::DoDrop(LDrop* instr) {
   __ Drop(instr->count());
 }
 
 
 void LCodeGen::DoThisFunction(LThisFunction* instr) {
   Register result = ToRegister(instr->result());
   __ movq(result, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
 }
 
 
 void LCodeGen::DoContext(LContext* instr) {
   Register result = ToRegister(instr->result());
-  __ movq(result, rsi);
+  if (info()->IsOptimizing()) {
+    __ movq(result, Operand(rbp, StandardFrameConstants::kContextOffset));
+  } else {
+    // If there is no frame, the context must be in rsi.
+    ASSERT(result.is(rsi));
+  }
 }
 
 
 void LCodeGen::DoOuterContext(LOuterContext* instr) {
   Register context = ToRegister(instr->context());
   Register result = ToRegister(instr->result());
   __ movq(result,
           Operand(context, Context::SlotOffset(Context::PREVIOUS_INDEX)));
 }
 
 
 void LCodeGen::DoDeclareGlobals(LDeclareGlobals* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   __ push(rsi);  // The context is the first argument.
   __ Push(instr->hydrogen()->pairs());
   __ Push(Smi::FromInt(instr->hydrogen()->flags()));
   CallRuntime(Runtime::kDeclareGlobals, 3, instr);
 }
 
 
 void LCodeGen::DoGlobalObject(LGlobalObject* instr) {
+  Register context = ToRegister(instr->context());
   Register result = ToRegister(instr->result());
-  __ movq(result, GlobalObjectOperand());
+  __ movq(result,
+          Operand(context, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
 }
 
 
 void LCodeGen::DoGlobalReceiver(LGlobalReceiver* instr) {
   Register global = ToRegister(instr->global());
   Register result = ToRegister(instr->result());
   __ movq(result, FieldOperand(global, GlobalObject::kGlobalReceiverOffset));
 }
 
 
@@ skipping 36 matching lines @@
     RecordSafepointWithLazyDeopt(instr, RECORD_SIMPLE_SAFEPOINT, 0);
   } else {
     // We need to adapt arguments.
     SafepointGenerator generator(
         this, pointers, Safepoint::kLazyDeopt);
     ParameterCount count(arity);
     ParameterCount expected(formal_parameter_count);
     __ InvokeFunction(
         function, expected, count, CALL_FUNCTION, generator, call_kind);
   }
-
-  // Restore context.
-  __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
 }
 
 
 void LCodeGen::DoCallConstantFunction(LCallConstantFunction* instr) {
   ASSERT(ToRegister(instr->result()).is(rax));
   CallKnownFunction(instr->hydrogen()->function(),
                     instr->hydrogen()->formal_parameter_count(),
                     instr->arity(),
                     instr,
                     CALL_AS_METHOD,
@@ skipping 20 matching lines @@
   // |result| are the same register and |input| will be restored
   // unchanged by popping safepoint registers.
   __ testl(tmp, Immediate(HeapNumber::kSignMask));
   __ j(zero, &done);
 
   __ AllocateHeapNumber(tmp, tmp2, &slow);
   __ jmp(&allocated, Label::kNear);
 
   // Slow case: Call the runtime system to do the number allocation.
   __ bind(&slow);
-  CallRuntimeFromDeferred(Runtime::kAllocateHeapNumber, 0, instr);
+  CallRuntimeFromDeferred(
+      Runtime::kAllocateHeapNumber, 0, instr, instr->context());
   // Set the pointer to the new heap number in tmp.
   if (!tmp.is(rax)) __ movq(tmp, rax);
   // Restore input_reg after call to runtime.
   __ LoadFromSafepointRegisterSlot(input_reg, input_reg);
 
   __ bind(&allocated);
   __ MoveDouble(tmp2, FieldOperand(input_reg, HeapNumber::kValueOffset));
   __ shl(tmp2, Immediate(1));
   __ shr(tmp2, Immediate(1));
   __ MoveDouble(FieldOperand(tmp, HeapNumber::kValueOffset), tmp2);
@@ skipping 358 matching lines @@
   __ fyl2x();
   __ fstp_d(Operand(rsp, 0));
   __ movsd(input_reg, Operand(rsp, 0));
   __ addq(rsp, Immediate(kDoubleSize));
   __ bind(&done);
 }
 
 
 void LCodeGen::DoMathTan(LMathTan* instr) {
   ASSERT(ToDoubleRegister(instr->result()).is(xmm1));
+  // Set the context register to a GC-safe fake value. Clobbering it is
+  // OK because this instruction is marked as a call.
+  __ Set(rsi, 0);
   TranscendentalCacheStub stub(TranscendentalCache::TAN,
                                TranscendentalCacheStub::UNTAGGED);
   CallCode(stub.GetCode(isolate()), RelocInfo::CODE_TARGET, instr);
 }
 
 
 void LCodeGen::DoMathCos(LMathCos* instr) {
   ASSERT(ToDoubleRegister(instr->result()).is(xmm1));
+  // Set the context register to a GC-safe fake value. Clobbering it is
+  // OK because this instruction is marked as a call.
+  __ Set(rsi, 0);
   TranscendentalCacheStub stub(TranscendentalCache::COS,
                                TranscendentalCacheStub::UNTAGGED);
   CallCode(stub.GetCode(isolate()), RelocInfo::CODE_TARGET, instr);
 }
 
 
 void LCodeGen::DoMathSin(LMathSin* instr) {
   ASSERT(ToDoubleRegister(instr->result()).is(xmm1));
+  // Set the context register to a GC-safe fake value. Clobbering it is
+  // OK because this instruction is marked as a call.
+  __ Set(rsi, 0);
   TranscendentalCacheStub stub(TranscendentalCache::SIN,
                                TranscendentalCacheStub::UNTAGGED);
   CallCode(stub.GetCode(isolate()), RelocInfo::CODE_TARGET, instr);
 }
 
 
 void LCodeGen::DoInvokeFunction(LInvokeFunction* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   ASSERT(ToRegister(instr->function()).is(rdi));
   ASSERT(instr->HasPointerMap());
 
   Handle<JSFunction> known_function = instr->hydrogen()->known_function();
   if (known_function.is_null()) {
     LPointerMap* pointers = instr->pointer_map();
     SafepointGenerator generator(this, pointers, Safepoint::kLazyDeopt);
     ParameterCount count(instr->arity());
     __ InvokeFunction(rdi, count, CALL_FUNCTION, generator, CALL_AS_METHOD);
-    __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
   } else {
     CallKnownFunction(known_function,
                       instr->hydrogen()->formal_parameter_count(),
                       instr->arity(),
                       instr,
                       CALL_AS_METHOD,
                       RDI_CONTAINS_TARGET);
   }
 }
 
 
 void LCodeGen::DoCallKeyed(LCallKeyed* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   ASSERT(ToRegister(instr->key()).is(rcx));
   ASSERT(ToRegister(instr->result()).is(rax));
 
   int arity = instr->arity();
   Handle<Code> ic =
       isolate()->stub_cache()->ComputeKeyedCallInitialize(arity);
   CallCode(ic, RelocInfo::CODE_TARGET, instr);
-  __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
 }
 
 
 void LCodeGen::DoCallNamed(LCallNamed* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   ASSERT(ToRegister(instr->result()).is(rax));
 
   int arity = instr->arity();
   RelocInfo::Mode mode = RelocInfo::CODE_TARGET;
   Handle<Code> ic =
       isolate()->stub_cache()->ComputeCallInitialize(arity, mode);
   __ Move(rcx, instr->name());
   CallCode(ic, mode, instr);
-  __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
 }
 
 
 void LCodeGen::DoCallFunction(LCallFunction* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   ASSERT(ToRegister(instr->function()).is(rdi));
   ASSERT(ToRegister(instr->result()).is(rax));
 
   int arity = instr->arity();
   CallFunctionStub stub(arity, NO_CALL_FUNCTION_FLAGS);
   CallCode(stub.GetCode(isolate()), RelocInfo::CODE_TARGET, instr);
-  __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
 }
 
 
 void LCodeGen::DoCallGlobal(LCallGlobal* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   ASSERT(ToRegister(instr->result()).is(rax));
   int arity = instr->arity();
   RelocInfo::Mode mode = RelocInfo::CODE_TARGET_CONTEXT;
   Handle<Code> ic =
       isolate()->stub_cache()->ComputeCallInitialize(arity, mode);
   __ Move(rcx, instr->name());
   CallCode(ic, mode, instr);
-  __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
 }
 
 
 void LCodeGen::DoCallKnownGlobal(LCallKnownGlobal* instr) {
   ASSERT(ToRegister(instr->result()).is(rax));
   CallKnownFunction(instr->hydrogen()->target(),
                     instr->hydrogen()->formal_parameter_count(),
                     instr->arity(),
                     instr,
                     CALL_AS_FUNCTION,
                     RDI_UNINITIALIZED);
 }
 
 
 void LCodeGen::DoCallNew(LCallNew* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   ASSERT(ToRegister(instr->constructor()).is(rdi));
   ASSERT(ToRegister(instr->result()).is(rax));
 
   __ Set(rax, instr->arity());
   // No cell in ebx for construct type feedback in optimized code
   Handle<Object> undefined_value(isolate()->factory()->undefined_value());
   __ Move(rbx, undefined_value);
   CallConstructStub stub(NO_CALL_FUNCTION_FLAGS);
   CallCode(stub.GetCode(isolate()), RelocInfo::CONSTRUCT_CALL, instr);
 }
 
 
 void LCodeGen::DoCallNewArray(LCallNewArray* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   ASSERT(ToRegister(instr->constructor()).is(rdi));
   ASSERT(ToRegister(instr->result()).is(rax));
 
   __ Set(rax, instr->arity());
   __ Move(rbx, instr->hydrogen()->property_cell());
   ElementsKind kind = instr->hydrogen()->elements_kind();
   AllocationSiteOverrideMode override_mode =
       (AllocationSite::GetMode(kind) == TRACK_ALLOCATION_SITE)
           ? DISABLE_ALLOCATION_SITES
           : DONT_OVERRIDE;
@@ skipping 24 matching lines @@
     CallCode(stub.GetCode(isolate()), RelocInfo::CONSTRUCT_CALL, instr);
     __ bind(&done);
   } else {
     ArrayNArgumentsConstructorStub stub(kind, context_mode, override_mode);
     CallCode(stub.GetCode(isolate()), RelocInfo::CONSTRUCT_CALL, instr);
   }
 }
 
 
 void LCodeGen::DoCallRuntime(LCallRuntime* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   CallRuntime(instr->function(), instr->arity(), instr, instr->save_doubles());
 }
 
 
 void LCodeGen::DoStoreCodeEntry(LStoreCodeEntry* instr) {
   Register function = ToRegister(instr->function());
   Register code_object = ToRegister(instr->code_object());
   __ lea(code_object, FieldOperand(code_object, Code::kHeaderSize));
   __ movq(FieldOperand(function, JSFunction::kCodeEntryOffset), code_object);
 }
@@ skipping 112 matching lines @@
                         value,
                         temp,
                         kSaveFPRegs,
                         EMIT_REMEMBERED_SET,
                         check_needed);
   }
 }
 
 
 void LCodeGen::DoStoreNamedGeneric(LStoreNamedGeneric* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   ASSERT(ToRegister(instr->object()).is(rdx));
   ASSERT(ToRegister(instr->value()).is(rax));
 
   __ Move(rcx, instr->hydrogen()->name());
   Handle<Code> ic = (instr->strict_mode_flag() == kStrictMode)
       ? isolate()->builtins()->StoreIC_Initialize_Strict()
       : isolate()->builtins()->StoreIC_Initialize();
   CallCode(ic, RelocInfo::CODE_TARGET, instr);
 }
 
@@ skipping 217 matching lines @@
     DoStoreKeyedExternalArray(instr);
   } else if (instr->hydrogen()->value()->representation().IsDouble()) {
     DoStoreKeyedFixedDoubleArray(instr);
   } else {
     DoStoreKeyedFixedArray(instr);
   }
 }
 
 
 void LCodeGen::DoStoreKeyedGeneric(LStoreKeyedGeneric* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   ASSERT(ToRegister(instr->object()).is(rdx));
   ASSERT(ToRegister(instr->key()).is(rcx));
   ASSERT(ToRegister(instr->value()).is(rax));
 
   Handle<Code> ic = (instr->strict_mode_flag() == kStrictMode)
       ? isolate()->builtins()->KeyedStoreIC_Initialize_Strict()
       : isolate()->builtins()->KeyedStoreIC_Initialize();
   CallCode(ic, RelocInfo::CODE_TARGET, instr);
 }
 
@@ skipping 15 matching lines @@
     __ movq(FieldOperand(object_reg, HeapObject::kMapOffset), new_map_reg);
     // Write barrier.
     ASSERT_NE(instr->temp(), NULL);
     __ RecordWriteField(object_reg, HeapObject::kMapOffset, new_map_reg,
                         ToRegister(instr->temp()), kDontSaveFPRegs);
   } else {
     PushSafepointRegistersScope scope(this);
     if (!object_reg.is(rax)) {
       __ movq(rax, object_reg);
     }
+    LoadContextFromDeferred(instr->context());
     __ Move(rbx, to_map);
     TransitionElementsKindStub stub(from_kind, to_kind);
     __ CallStub(&stub);
     RecordSafepointWithRegisters(
         instr->pointer_map(), 0, Safepoint::kNoLazyDeopt);
   }
   __ bind(&not_applicable);
 }
 
 
 void LCodeGen::DoTrapAllocationMemento(LTrapAllocationMemento* instr) {
   Register object = ToRegister(instr->object());
   Register temp = ToRegister(instr->temp());
   Label no_memento_found;
   __ TestJSArrayForAllocationMemento(object, temp, &no_memento_found);
   DeoptimizeIf(equal, instr->environment());
   __ bind(&no_memento_found);
 }
 
 
 void LCodeGen::DoStringAdd(LStringAdd* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   EmitPushTaggedOperand(instr->left());
   EmitPushTaggedOperand(instr->right());
   StringAddStub stub(instr->hydrogen()->flags());
   CallCode(stub.GetCode(isolate()), RelocInfo::CODE_TARGET, instr);
 }
 
 
 void LCodeGen::DoStringCharCodeAt(LStringCharCodeAt* instr) {
   class DeferredStringCharCodeAt V8_FINAL : public LDeferredCode {
    public:
@@ skipping 34 matching lines @@
   // DoStringCharCodeAt above.
   STATIC_ASSERT(String::kMaxLength <= Smi::kMaxValue);
   if (instr->index()->IsConstantOperand()) {
     int32_t const_index = ToInteger32(LConstantOperand::cast(instr->index()));
     __ Push(Smi::FromInt(const_index));
   } else {
     Register index = ToRegister(instr->index());
     __ Integer32ToSmi(index, index);
     __ push(index);
   }
-  CallRuntimeFromDeferred(Runtime::kStringCharCodeAt, 2, instr);
+  CallRuntimeFromDeferred(
+      Runtime::kStringCharCodeAt, 2, instr, instr->context());
   __ AssertSmi(rax);
   __ SmiToInteger32(rax, rax);
   __ StoreToSafepointRegisterSlot(result, rax);
 }
 
 
 void LCodeGen::DoStringCharFromCode(LStringCharFromCode* instr) {
   class DeferredStringCharFromCode V8_FINAL : public LDeferredCode {
    public:
     DeferredStringCharFromCode(LCodeGen* codegen, LStringCharFromCode* instr)
@@ skipping 32 matching lines @@
   Register result = ToRegister(instr->result());
 
   // TODO(3095996): Get rid of this. For now, we need to make the
   // result register contain a valid pointer because it is already
   // contained in the register pointer map.
   __ Set(result, 0);
 
   PushSafepointRegistersScope scope(this);
   __ Integer32ToSmi(char_code, char_code);
   __ push(char_code);
-  CallRuntimeFromDeferred(Runtime::kCharFromCode, 1, instr);
+  CallRuntimeFromDeferred(Runtime::kCharFromCode, 1, instr, instr->context());
   __ StoreToSafepointRegisterSlot(result, rax);
 }
 
 
 void LCodeGen::DoInteger32ToDouble(LInteger32ToDouble* instr) {
   LOperand* input = instr->value();
   ASSERT(input->IsRegister() || input->IsStackSlot());
   LOperand* output = instr->result();
   ASSERT(output->IsDoubleRegister());
   if (input->IsRegister()) {
@@ skipping 83 matching lines @@
   }
 
   // Slow case: Call the runtime system to do the number allocation.
   __ bind(&slow);
 
   // Put a valid pointer value in the stack slot where the result
   // register is stored, as this register is in the pointer map, but contains an
   // integer value.
   __ StoreToSafepointRegisterSlot(reg, Immediate(0));
 
-  CallRuntimeFromDeferred(Runtime::kAllocateHeapNumber, 0, instr);
+  // NumberTagU uses the context from the frame, rather than
+  // the environment's HContext or HInlinedContext value.
+  // They only call Runtime::kAllocateHeapNumber.
+  // The corresponding HChange instructions are added in a phase that does
+  // not have easy access to the local context.
+  __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
+  __ CallRuntimeSaveDoubles(Runtime::kAllocateHeapNumber);
+  RecordSafepointWithRegisters(
+      instr->pointer_map(), 0, Safepoint::kNoLazyDeopt);
+
   if (!reg.is(rax)) __ movq(reg, rax);
 
   // Done. Put the value in temp_xmm into the value of the allocated heap
   // number.
   __ bind(&done);
   __ movsd(FieldOperand(reg, HeapNumber::kValueOffset), temp_xmm);
   __ StoreToSafepointRegisterSlot(reg, reg);
 }
 
 
@@ skipping 27 matching lines @@
 
 void LCodeGen::DoDeferredNumberTagD(LNumberTagD* instr) {
   // TODO(3095996): Get rid of this. For now, we need to make the
   // result register contain a valid pointer because it is already
   // contained in the register pointer map.
   Register reg = ToRegister(instr->result());
   __ Move(reg, Smi::FromInt(0));
 
   {
     PushSafepointRegistersScope scope(this);
-    CallRuntimeFromDeferred(Runtime::kAllocateHeapNumber, 0, instr);
-    // Ensure that value in rax survives popping registers.
+    // NumberTagD uses the context from the frame, rather than
+    // the environment's HContext or HInlinedContext value.
+    // They only call Runtime::kAllocateHeapNumber.
+    // The corresponding HChange instructions are added in a phase that does
+    // not have easy access to the local context.
+    __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
+    __ CallRuntimeSaveDoubles(Runtime::kAllocateHeapNumber);
+    RecordSafepointWithRegisters(
+        instr->pointer_map(), 0, Safepoint::kNoLazyDeopt);
     __ movq(kScratchRegister, rax);
   }
   __ movq(reg, kScratchRegister);
 }
 
 
 void LCodeGen::DoSmiTag(LSmiTag* instr) {
   ASSERT(instr->value()->Equals(instr->result()));
   Register input = ToRegister(instr->value());
   ASSERT(!instr->hydrogen_value()->CheckFlag(HValue::kCanOverflow));
@@ skipping 285 matching lines @@
   Register reg = ToRegister(instr->value());
   __ Cmp(reg, instr->hydrogen()->object().handle());
   DeoptimizeIf(not_equal, instr->environment());
 }
 
 
 void LCodeGen::DoDeferredInstanceMigration(LCheckMaps* instr, Register object) {
   {
     PushSafepointRegistersScope scope(this);
     __ push(object);
-    CallRuntimeFromDeferred(Runtime::kMigrateInstance, 1, instr);
+    __ Set(rsi, 0);
+    __ CallRuntimeSaveDoubles(Runtime::kMigrateInstance);
+    RecordSafepointWithRegisters(
+        instr->pointer_map(), 1, Safepoint::kNoLazyDeopt);
+
     __ testq(rax, Immediate(kSmiTagMask));
   }
   DeoptimizeIf(zero, instr->environment());
 }
 
 
 void LCodeGen::DoCheckMaps(LCheckMaps* instr) {
   class DeferredCheckMaps V8_FINAL : public LDeferredCode {
    public:
     DeferredCheckMaps(LCodeGen* codegen, LCheckMaps* instr, Register object)
@@ skipping 171 matching lines @@
     __ Integer32ToSmi(size, size);
     __ push(size);
   } else {
     int32_t size = ToInteger32(LConstantOperand::cast(instr->size()));
     __ Push(Smi::FromInt(size));
   }
 
   if (instr->hydrogen()->IsOldPointerSpaceAllocation()) {
     ASSERT(!instr->hydrogen()->IsOldDataSpaceAllocation());
     ASSERT(!instr->hydrogen()->IsNewSpaceAllocation());
-    CallRuntimeFromDeferred(Runtime::kAllocateInOldPointerSpace, 1, instr);
+    CallRuntimeFromDeferred(
+        Runtime::kAllocateInOldPointerSpace, 1, instr, instr->context());
   } else if (instr->hydrogen()->IsOldDataSpaceAllocation()) {
     ASSERT(!instr->hydrogen()->IsNewSpaceAllocation());
-    CallRuntimeFromDeferred(Runtime::kAllocateInOldDataSpace, 1, instr);
+    CallRuntimeFromDeferred(
+        Runtime::kAllocateInOldDataSpace, 1, instr, instr->context());
   } else {
-    CallRuntimeFromDeferred(Runtime::kAllocateInNewSpace, 1, instr);
+    CallRuntimeFromDeferred(
+        Runtime::kAllocateInNewSpace, 1, instr, instr->context());
   }
   __ StoreToSafepointRegisterSlot(result, rax);
 }
 
 
 void LCodeGen::DoToFastProperties(LToFastProperties* instr) {
   ASSERT(ToRegister(instr->value()).is(rax));
   __ push(rax);
   CallRuntime(Runtime::kToFastProperties, 1, instr);
 }
 
 
 void LCodeGen::DoRegExpLiteral(LRegExpLiteral* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   Label materialized;
   // Registers will be used as follows:
   // rcx = literals array.
   // rbx = regexp literal.
   // rax = regexp literal clone.
   int literal_offset =
       FixedArray::OffsetOfElementAt(instr->hydrogen()->literal_index());
   __ Move(rcx, instr->hydrogen()->literals());
   __ movq(rbx, FieldOperand(rcx, literal_offset));
   __ CompareRoot(rbx, Heap::kUndefinedValueRootIndex);
@@ skipping 30 matching lines @@
     __ movq(FieldOperand(rax, i + kPointerSize), rcx);
   }
   if ((size % (2 * kPointerSize)) != 0) {
     __ movq(rdx, FieldOperand(rbx, size - kPointerSize));
     __ movq(FieldOperand(rax, size - kPointerSize), rdx);
   }
 }
 
 
 void LCodeGen::DoFunctionLiteral(LFunctionLiteral* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   // Use the fast case closure allocation code that allocates in new
   // space for nested functions that don't need literals cloning.
   bool pretenure = instr->hydrogen()->pretenure();
   if (!pretenure && instr->hydrogen()->has_no_literals()) {
     FastNewClosureStub stub(instr->hydrogen()->language_mode(),
                             instr->hydrogen()->is_generator());
     __ Move(rbx, instr->hydrogen()->shared_info());
     CallCode(stub.GetCode(isolate()), RelocInfo::CODE_TARGET, instr);
   } else {
     __ push(rsi);
     __ Push(instr->hydrogen()->shared_info());
     __ PushRoot(pretenure ? Heap::kTrueValueRootIndex :
                             Heap::kFalseValueRootIndex);
     CallRuntime(Runtime::kNewClosure, 3, instr);
   }
 }
 
 
 void LCodeGen::DoTypeof(LTypeof* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   LOperand* input = instr->value();
   EmitPushTaggedOperand(input);
   CallRuntime(Runtime::kTypeof, 1, instr);
 }
 
 
 void LCodeGen::EmitPushTaggedOperand(LOperand* operand) {
   ASSERT(!operand->IsDoubleRegister());
   if (operand->IsConstantOperand()) {
     __ Push(ToHandle(LConstantOperand::cast(operand)));
@@ skipping 187 matching lines @@
 
   ASSERT(instr->HasEnvironment());
   LEnvironment* env = instr->environment();
   // There is no LLazyBailout instruction for stack-checks. We have to
   // prepare for lazy deoptimization explicitly here.
   if (instr->hydrogen()->is_function_entry()) {
     // Perform stack overflow check.
     Label done;
     __ CompareRoot(rsp, Heap::kStackLimitRootIndex);
     __ j(above_equal, &done, Label::kNear);
+
+    ASSERT(instr->context()->IsRegister());
+    ASSERT(ToRegister(instr->context()).is(rsi));
     CallCode(isolate()->builtins()->StackCheck(),
              RelocInfo::CODE_TARGET,
              instr);
     EnsureSpaceForLazyDeopt(Deoptimizer::patch_size());
     last_lazy_deopt_pc_ = masm()->pc_offset();
     __ bind(&done);
     RegisterEnvironmentForDeoptimization(env, Safepoint::kLazyDeopt);
     safepoints_.RecordLazyDeoptimizationIndex(env->deoptimization_index());
   } else {
     ASSERT(instr->hydrogen()->is_backwards_branch());
@@ skipping 23 matching lines @@
   // If the environment were already registered, we would have no way of
   // backpatching it with the spill slot operands.
   ASSERT(!environment->HasBeenRegistered());
   RegisterEnvironmentForDeoptimization(environment, Safepoint::kNoLazyDeopt);
 
   GenerateOsrPrologue();
 }
 
 
 void LCodeGen::DoForInPrepareMap(LForInPrepareMap* instr) {
+  ASSERT(ToRegister(instr->context()).is(rsi));
   __ CompareRoot(rax, Heap::kUndefinedValueRootIndex);
   DeoptimizeIf(equal, instr->environment());
 
   Register null_value = rdi;
   __ LoadRoot(null_value, Heap::kNullValueRootIndex);
   __ cmpq(rax, null_value);
   DeoptimizeIf(equal, instr->environment());
 
   Condition cc = masm()->CheckSmi(rax);
   DeoptimizeIf(cc, instr->environment());
@@ skipping 73 matching lines @@
                                FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64