[stubs] Remove unused StoreGlobalViaContextStub.

src/mips64/code-stubs-mips64.cc

 // Copyright 2012 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_MIPS64
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 4582 matching lines @@
   }
   __ jmp(&done_allocate);
 
   // Fall back to %NewStrictArguments.
   __ bind(&too_big_for_new_space);
   __ Push(a1);
   __ TailCallRuntime(Runtime::kNewStrictArguments);
 }
 
 
-void StoreGlobalViaContextStub::Generate(MacroAssembler* masm) {
-  Register context_reg = cp;
-  Register slot_reg = a2;
-  Register value_reg = a0;
-  Register cell_reg = a4;
-  Register cell_value_reg = a5;
-  Register cell_details_reg = a6;
-  Label fast_heapobject_case, fast_smi_case, slow_case;
-
-  if (FLAG_debug_code) {
-    __ LoadRoot(at, Heap::kTheHoleValueRootIndex);
-    __ Check(ne, kUnexpectedValue, value_reg, Operand(at));
-  }
-
-  // Go up context chain to the script context.
-  for (int i = 0; i < depth(); ++i) {
-    __ ld(cell_reg, ContextMemOperand(context_reg, Context::PREVIOUS_INDEX));
-    context_reg = cell_reg;
-  }
-
-  // Load the PropertyCell at the specified slot.
-  __ Dlsa(at, context_reg, slot_reg, kPointerSizeLog2);
-  __ ld(cell_reg, ContextMemOperand(at, 0));
-
-  // Load PropertyDetails for the cell (actually only the cell_type and kind).
-  __ ld(cell_details_reg,
-        FieldMemOperand(cell_reg, PropertyCell::kDetailsOffset));
-  __ SmiUntag(cell_details_reg);
-  __ And(cell_details_reg, cell_details_reg,
-         PropertyDetails::PropertyCellTypeField::kMask |
-             PropertyDetails::KindField::kMask |
-             PropertyDetails::kAttributesReadOnlyMask);
-
-  // Check if PropertyCell holds mutable data.
-  Label not_mutable_data;
-  __ Branch(&not_mutable_data, ne, cell_details_reg,
-            Operand(PropertyDetails::PropertyCellTypeField::encode(
-                        PropertyCellType::kMutable) |
-                    PropertyDetails::KindField::encode(kData)));
-  __ JumpIfSmi(value_reg, &fast_smi_case);
-  __ bind(&fast_heapobject_case);
-  __ sd(value_reg, FieldMemOperand(cell_reg, PropertyCell::kValueOffset));
-  __ RecordWriteField(cell_reg, PropertyCell::kValueOffset, value_reg,
-                      cell_details_reg, kRAHasNotBeenSaved, kDontSaveFPRegs,
-                      EMIT_REMEMBERED_SET, OMIT_SMI_CHECK);
-  // RecordWriteField clobbers the value register, so we need to reload.
-  __ Ret(USE_DELAY_SLOT);
-  __ ld(value_reg, FieldMemOperand(cell_reg, PropertyCell::kValueOffset));
-  __ bind(&not_mutable_data);
-
-  // Check if PropertyCell value matches the new value (relevant for Constant,
-  // ConstantType and Undefined cells).
-  Label not_same_value;
-  __ ld(cell_value_reg, FieldMemOperand(cell_reg, PropertyCell::kValueOffset));
-  __ Branch(&not_same_value, ne, value_reg, Operand(cell_value_reg));
-  // Make sure the PropertyCell is not marked READ_ONLY.
-  __ And(at, cell_details_reg, PropertyDetails::kAttributesReadOnlyMask);
-  __ Branch(&slow_case, ne, at, Operand(zero_reg));
-  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.
-    __ Branch(&done, eq, cell_details_reg,
-              Operand(PropertyDetails::PropertyCellTypeField::encode(
-                          PropertyCellType::kConstant) |
-                      PropertyDetails::KindField::encode(kData)));
-    __ Branch(&done, eq, cell_details_reg,
-              Operand(PropertyDetails::PropertyCellTypeField::encode(
-                          PropertyCellType::kConstantType) |
-                      PropertyDetails::KindField::encode(kData)));
-    __ Check(eq, kUnexpectedValue, cell_details_reg,
-             Operand(PropertyDetails::PropertyCellTypeField::encode(
-                         PropertyCellType::kUndefined) |
-                     PropertyDetails::KindField::encode(kData)));
-    __ bind(&done);
-  }
-  __ Ret();
-  __ bind(&not_same_value);
-
-  // Check if PropertyCell contains data with constant type (and is not
-  // READ_ONLY).
-  __ Branch(&slow_case, ne, cell_details_reg,
-            Operand(PropertyDetails::PropertyCellTypeField::encode(
-                        PropertyCellType::kConstantType) |
-                    PropertyDetails::KindField::encode(kData)));
-
-  // 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);
-  __ JumpIfNotSmi(cell_value_reg, &slow_case);
-  // Old and new values are SMIs, no need for a write barrier here.
-  __ bind(&fast_smi_case);
-  __ Ret(USE_DELAY_SLOT);
-  __ sd(value_reg, FieldMemOperand(cell_reg, PropertyCell::kValueOffset));
-  __ bind(&value_is_heap_object);
-  __ JumpIfSmi(cell_value_reg, &slow_case);
-  Register cell_value_map_reg = cell_value_reg;
-  __ ld(cell_value_map_reg,
-        FieldMemOperand(cell_value_reg, HeapObject::kMapOffset));
-  __ Branch(&fast_heapobject_case, eq, cell_value_map_reg,
-            FieldMemOperand(value_reg, HeapObject::kMapOffset));
-
-  // Fallback to the runtime.
-  __ bind(&slow_case);
-  __ SmiTag(slot_reg);
-  __ Push(slot_reg, value_reg);
-  __ TailCallRuntime(is_strict(language_mode())
-                         ? Runtime::kStoreGlobalViaContext_Strict
-                         : Runtime::kStoreGlobalViaContext_Sloppy);
-}
-
-
 static int AddressOffset(ExternalReference ref0, ExternalReference ref1) {
   int64_t offset = (ref0.address() - ref1.address());
   DCHECK(static_cast<int>(offset) == offset);
   return static_cast<int>(offset);
 }
 
 
 // Calls an API function.  Allocates HandleScope, extracts returned value
 // from handle and propagates exceptions.  Restores context.  stack_space
 // - space to be unwound on exit (includes the call JS arguments space and
@@ skipping 297 matching lines @@
                            kStackUnwindSpace, kInvalidStackOffset,
                            return_value_operand, NULL);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS64