[stubs] Remove unused StoreGlobalViaContextStub.

src/arm64/code-stubs-arm64.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_ARM64
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 4658 matching lines @@
   }
   __ B(&done_allocate);
 
   // Fall back to %NewStrictArguments.
   __ Bind(&too_big_for_new_space);
   __ Push(x1);
   __ TailCallRuntime(Runtime::kNewStrictArguments);
 }
 
 
-void StoreGlobalViaContextStub::Generate(MacroAssembler* masm) {
-  Register context = cp;
-  Register value = x0;
-  Register slot = x2;
-  Register context_temp = x10;
-  Register cell = x10;
-  Register cell_details = x11;
-  Register cell_value = x12;
-  Register cell_value_map = x13;
-  Register value_map = x14;
-  Label fast_heapobject_case, fast_smi_case, slow_case;
-
-  if (FLAG_debug_code) {
-    __ CompareRoot(value, Heap::kTheHoleValueRootIndex);
-    __ Check(ne, kUnexpectedValue);
-  }
-
-  // Go up the context chain to the script context.
-  for (int i = 0; i < depth(); i++) {
-    __ Ldr(context_temp, ContextMemOperand(context, Context::PREVIOUS_INDEX));
-    context = context_temp;
-  }
-
-  // Load the PropertyCell at the specified slot.
-  __ Add(cell, context, Operand(slot, LSL, kPointerSizeLog2));
-  __ Ldr(cell, ContextMemOperand(cell));
-
-  // Load PropertyDetails for the cell (actually only the cell_type and kind).
-  __ Ldr(cell_details,
-         UntagSmiFieldMemOperand(cell, PropertyCell::kDetailsOffset));
-  __ And(cell_details, cell_details,
-         PropertyDetails::PropertyCellTypeField::kMask |
-             PropertyDetails::KindField::kMask |
-             PropertyDetails::kAttributesReadOnlyMask);
-
-  // Check if PropertyCell holds mutable data.
-  Label not_mutable_data;
-  __ Cmp(cell_details, PropertyDetails::PropertyCellTypeField::encode(
-                           PropertyCellType::kMutable) |
-                           PropertyDetails::KindField::encode(kData));
-  __ B(ne, &not_mutable_data);
-  __ JumpIfSmi(value, &fast_smi_case);
-  __ Bind(&fast_heapobject_case);
-  __ Str(value, FieldMemOperand(cell, PropertyCell::kValueOffset));
-  // RecordWriteField clobbers the value register, so we copy it before the
-  // call.
-  __ Mov(x11, value);
-  __ RecordWriteField(cell, PropertyCell::kValueOffset, x11, x12,
-                      kLRHasNotBeenSaved, kDontSaveFPRegs, EMIT_REMEMBERED_SET,
-                      OMIT_SMI_CHECK);
-  __ Ret();
-
-  __ Bind(&not_mutable_data);
-  // Check if PropertyCell value matches the new value (relevant for Constant,
-  // ConstantType and Undefined cells).
-  Label not_same_value;
-  __ Ldr(cell_value, FieldMemOperand(cell, PropertyCell::kValueOffset));
-  __ Cmp(cell_value, value);
-  __ B(ne, &not_same_value);
-
-  // Make sure the PropertyCell is not marked READ_ONLY.
-  __ Tst(cell_details, PropertyDetails::kAttributesReadOnlyMask);
-  __ B(ne, &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.
-    __ Cmp(cell_details, PropertyDetails::PropertyCellTypeField::encode(
-                             PropertyCellType::kConstant) |
-                             PropertyDetails::KindField::encode(kData));
-    __ B(eq, &done);
-    __ Cmp(cell_details, PropertyDetails::PropertyCellTypeField::encode(
-                             PropertyCellType::kConstantType) |
-                             PropertyDetails::KindField::encode(kData));
-    __ B(eq, &done);
-    __ Cmp(cell_details, PropertyDetails::PropertyCellTypeField::encode(
-                             PropertyCellType::kUndefined) |
-                             PropertyDetails::KindField::encode(kData));
-    __ Check(eq, kUnexpectedValue);
-    __ Bind(&done);
-  }
-  __ Ret();
-  __ Bind(&not_same_value);
-
-  // Check if PropertyCell contains data with constant type (and is not
-  // READ_ONLY).
-  __ Cmp(cell_details, PropertyDetails::PropertyCellTypeField::encode(
-                           PropertyCellType::kConstantType) |
-                           PropertyDetails::KindField::encode(kData));
-  __ B(ne, &slow_case);
-
-  // 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, &value_is_heap_object);
-  __ JumpIfNotSmi(cell_value, &slow_case);
-  // Old and new values are smis, no need for a write barrier here.
-  __ Bind(&fast_smi_case);
-  __ Str(value, FieldMemOperand(cell, PropertyCell::kValueOffset));
-  __ Ret();
-
-  __ Bind(&value_is_heap_object);
-  __ JumpIfSmi(cell_value, &slow_case);
-
-  __ Ldr(cell_value_map, FieldMemOperand(cell_value, HeapObject::kMapOffset));
-  __ Ldr(value_map, FieldMemOperand(value, HeapObject::kMapOffset));
-  __ Cmp(cell_value_map, value_map);
-  __ B(eq, &fast_heapobject_case);
-
-  // Fall back to the runtime.
-  __ Bind(&slow_case);
-  __ SmiTag(slot);
-  __ Push(slot, value);
-  __ TailCallRuntime(is_strict(language_mode())
-                         ? Runtime::kStoreGlobalViaContext_Strict
-                         : Runtime::kStoreGlobalViaContext_Sloppy);
-}
-
-
 // The number of register that CallApiFunctionAndReturn will need to save on
 // the stack. The space for these registers need to be allocated in the
 // ExitFrame before calling CallApiFunctionAndReturn.
 static const int kCallApiFunctionSpillSpace = 4;
 
 
 static int AddressOffset(ExternalReference ref0, ExternalReference ref1) {
   return static_cast<int>(ref0.address() - ref1.address());
 }
 
@@ skipping 328 matching lines @@
                            kStackUnwindSpace, NULL, spill_offset,
                            return_value_operand, NULL);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64