[stubs] Remove unused StoreGlobalViaContextStub.

src/x64/code-stubs-x64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 4255 matching lines @@
 
   // Fall back to %NewStrictArguments.
   __ bind(&too_big_for_new_space);
   __ PopReturnAddressTo(kScratchRegister);
   __ Push(rdi);
   __ PushReturnAddressFrom(kScratchRegister);
   __ TailCallRuntime(Runtime::kNewStrictArguments);
 }
 
 
-void StoreGlobalViaContextStub::Generate(MacroAssembler* masm) {
-  Register context_reg = rsi;
-  Register slot_reg = rbx;
-  Register value_reg = rax;
-  Register cell_reg = r8;
-  Register cell_details_reg = rdx;
-  Register cell_value_reg = r9;
-  Label fast_heapobject_case, fast_smi_case, slow_case;
-
-  if (FLAG_debug_code) {
-    __ CompareRoot(value_reg, Heap::kTheHoleValueRootIndex);
-    __ Check(not_equal, kUnexpectedValue);
-  }
-
-  // Go up context chain to the script context.
-  for (int i = 0; i < depth(); ++i) {
-    __ movp(rdi, ContextOperand(context_reg, Context::PREVIOUS_INDEX));
-    context_reg = rdi;
-  }
-
-  // Load the PropertyCell at the specified slot.
-  __ movp(cell_reg, ContextOperand(context_reg, slot_reg));
-
-  // Load PropertyDetails for the cell (actually only the cell_type, kind and
-  // READ_ONLY bit of attributes).
-  __ SmiToInteger32(cell_details_reg,
-                    FieldOperand(cell_reg, PropertyCell::kDetailsOffset));
-  __ andl(cell_details_reg,
-          Immediate(PropertyDetails::PropertyCellTypeField::kMask |
-                    PropertyDetails::KindField::kMask |
-                    PropertyDetails::kAttributesReadOnlyMask));
-
-  // Check if PropertyCell holds mutable data.
-  Label not_mutable_data;
-  __ cmpl(cell_details_reg,
-          Immediate(PropertyDetails::PropertyCellTypeField::encode(
-                        PropertyCellType::kMutable) |
-                    PropertyDetails::KindField::encode(kData)));
-  __ j(not_equal, &not_mutable_data);
-  __ JumpIfSmi(value_reg, &fast_smi_case);
-  __ bind(&fast_heapobject_case);
-  __ movp(FieldOperand(cell_reg, PropertyCell::kValueOffset), value_reg);
-  __ RecordWriteField(cell_reg, PropertyCell::kValueOffset, value_reg,
-                      cell_value_reg, kDontSaveFPRegs, EMIT_REMEMBERED_SET,
-                      OMIT_SMI_CHECK);
-  // RecordWriteField clobbers the value register, so we need to reload.
-  __ movp(value_reg, FieldOperand(cell_reg, PropertyCell::kValueOffset));
-  __ Ret();
-  __ bind(&not_mutable_data);
-
-  // Check if PropertyCell value matches the new value (relevant for Constant,
-  // ConstantType and Undefined cells).
-  Label not_same_value;
-  __ movp(cell_value_reg, FieldOperand(cell_reg, PropertyCell::kValueOffset));
-  __ cmpp(cell_value_reg, value_reg);
-  __ j(not_equal, &not_same_value,
-       FLAG_debug_code ? Label::kFar : Label::kNear);
-  // Make sure the PropertyCell is not marked READ_ONLY.
-  __ testl(cell_details_reg,
-           Immediate(PropertyDetails::kAttributesReadOnlyMask));
-  __ j(not_zero, &slow_case);
-  if (FLAG_debug_code) {
-    Label done;
-    // This can only be true for Constant, ConstantType and Undefined cells,
-    // because we never store the_hole via this stub.
-    __ cmpl(cell_details_reg,
-            Immediate(PropertyDetails::PropertyCellTypeField::encode(
-                          PropertyCellType::kConstant) |
-                      PropertyDetails::KindField::encode(kData)));
-    __ j(equal, &done);
-    __ cmpl(cell_details_reg,
-            Immediate(PropertyDetails::PropertyCellTypeField::encode(
-                          PropertyCellType::kConstantType) |
-                      PropertyDetails::KindField::encode(kData)));
-    __ j(equal, &done);
-    __ cmpl(cell_details_reg,
-            Immediate(PropertyDetails::PropertyCellTypeField::encode(
-                          PropertyCellType::kUndefined) |
-                      PropertyDetails::KindField::encode(kData)));
-    __ Check(equal, kUnexpectedValue);
-    __ bind(&done);
-  }
-  __ Ret();
-  __ bind(&not_same_value);
-
-  // Check if PropertyCell contains data with constant type (and is not
-  // READ_ONLY).
-  __ cmpl(cell_details_reg,
-          Immediate(PropertyDetails::PropertyCellTypeField::encode(
-                        PropertyCellType::kConstantType) |
-                    PropertyDetails::KindField::encode(kData)));
-  __ j(not_equal, &slow_case, Label::kNear);
-
-  // Now either both old and new values must be SMIs or both must be heap
-  // objects with same map.
-  Label value_is_heap_object;
-  __ JumpIfNotSmi(value_reg, &value_is_heap_object, Label::kNear);
-  __ JumpIfNotSmi(cell_value_reg, &slow_case, Label::kNear);
-  // Old and new values are SMIs, no need for a write barrier here.
-  __ bind(&fast_smi_case);
-  __ movp(FieldOperand(cell_reg, PropertyCell::kValueOffset), value_reg);
-  __ Ret();
-  __ bind(&value_is_heap_object);
-  __ JumpIfSmi(cell_value_reg, &slow_case, Label::kNear);
-  Register cell_value_map_reg = cell_value_reg;
-  __ movp(cell_value_map_reg,
-          FieldOperand(cell_value_reg, HeapObject::kMapOffset));
-  __ cmpp(cell_value_map_reg, FieldOperand(value_reg, HeapObject::kMapOffset));
-  __ j(equal, &fast_heapobject_case);
-
-  // Fallback to the runtime.
-  __ bind(&slow_case);
-  __ Integer32ToSmi(slot_reg, slot_reg);
-  __ PopReturnAddressTo(kScratchRegister);
-  __ Push(slot_reg);
-  __ Push(value_reg);
-  __ Push(kScratchRegister);
-  __ TailCallRuntime(is_strict(language_mode())
-                         ? Runtime::kStoreGlobalViaContext_Strict
-                         : Runtime::kStoreGlobalViaContext_Sloppy);
-}
-
-
 static int Offset(ExternalReference ref0, ExternalReference ref1) {
   int64_t offset = (ref0.address() - ref1.address());
   // Check that fits into int.
   DCHECK(static_cast<int>(offset) == offset);
   return static_cast<int>(offset);
 }
 
 
 // Prepares stack to put arguments (aligns and so on).  WIN64 calling
 // convention requires to put the pointer to the return value slot into
@@ skipping 371 matching lines @@
                            kStackUnwindSpace, nullptr, return_value_operand,
                            NULL);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64