Improve write barriers in optimized code.

src/arm/lithium-codegen-arm.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.
 
 #include "src/v8.h"
 
 #include "src/arm/lithium-codegen-arm.h"
 #include "src/arm/lithium-gap-resolver-arm.h"
 #include "src/code-stubs.h"
 #include "src/stub-cache.h"
@@ skipping 4066 matching lines @@
   }
 
   if (instr->hydrogen()->has_transition()) {
     Handle<Map> transition = instr->hydrogen()->transition_map();
     AddDeprecationDependency(transition);
     __ mov(scratch, Operand(transition));
     __ str(scratch, FieldMemOperand(object, HeapObject::kMapOffset));
     if (instr->hydrogen()->NeedsWriteBarrierForMap()) {
       Register temp = ToRegister(instr->temp());
       // Update the write barrier for the map field.
-      __ RecordWriteField(object,
-                          HeapObject::kMapOffset,
-                          scratch,
-                          temp,
-                          GetLinkRegisterState(),
-                          kSaveFPRegs,
-                          OMIT_REMEMBERED_SET,
-                          OMIT_SMI_CHECK);
+      __ RecordWriteForMap(object,
+                           scratch,
+                           temp,
+                           GetLinkRegisterState(),
+                           kSaveFPRegs);
     }
   }
 
   // Do the store.
   Register value = ToRegister(instr->value());
   if (access.IsInobject()) {
     MemOperand operand = FieldMemOperand(object, offset);
     __ Store(value, operand, representation);
     if (instr->hydrogen()->NeedsWriteBarrier()) {
       // Update the write barrier for the object for in-object properties.
       __ RecordWriteField(object,
                           offset,
                           value,
                           scratch,
                           GetLinkRegisterState(),
                           kSaveFPRegs,
                           EMIT_REMEMBERED_SET,
-                          instr->hydrogen()->SmiCheckForWriteBarrier());
+                          instr->hydrogen()->SmiCheckForWriteBarrier(),
+                          instr->hydrogen()->PointersToHereCheckForValue());
     }
   } else {
     __ ldr(scratch, FieldMemOperand(object, JSObject::kPropertiesOffset));
     MemOperand operand = FieldMemOperand(scratch, offset);
     __ Store(value, operand, representation);
     if (instr->hydrogen()->NeedsWriteBarrier()) {
       // Update the write barrier for the properties array.
       // object is used as a scratch register.
       __ RecordWriteField(scratch,
                           offset,
                           value,
                           object,
                           GetLinkRegisterState(),
                           kSaveFPRegs,
                           EMIT_REMEMBERED_SET,
-                          instr->hydrogen()->SmiCheckForWriteBarrier());
+                          instr->hydrogen()->SmiCheckForWriteBarrier(),
+                          instr->hydrogen()->PointersToHereCheckForValue());
     }
   }
 }
 
 
 void LCodeGen::DoStoreNamedGeneric(LStoreNamedGeneric* instr) {
   ASSERT(ToRegister(instr->context()).is(cp));
   ASSERT(ToRegister(instr->object()).is(r1));
   ASSERT(ToRegister(instr->value()).is(r0));
 
@@ skipping 189 matching lines @@
         instr->hydrogen()->value()->type().IsHeapObject()
             ? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
     // Compute address of modified element and store it into key register.
     __ add(key, store_base, Operand(offset));
     __ RecordWrite(elements,
                    key,
                    value,
                    GetLinkRegisterState(),
                    kSaveFPRegs,
                    EMIT_REMEMBERED_SET,
-                   check_needed);
+                   check_needed,
+                   instr->hydrogen()->PointersToHereCheckForValue());
   }
 }
 
 
 void LCodeGen::DoStoreKeyed(LStoreKeyed* instr) {
   // By cases: external, fast double
   if (instr->is_typed_elements()) {
     DoStoreKeyedExternalArray(instr);
   } else if (instr->hydrogen()->value()->representation().IsDouble()) {
     DoStoreKeyedFixedDoubleArray(instr);
@@ skipping 28 matching lines @@
   Label not_applicable;
   __ ldr(scratch, FieldMemOperand(object_reg, HeapObject::kMapOffset));
   __ cmp(scratch, Operand(from_map));
   __ b(ne, &not_applicable);
 
   if (IsSimpleMapChangeTransition(from_kind, to_kind)) {
     Register new_map_reg = ToRegister(instr->new_map_temp());
     __ mov(new_map_reg, Operand(to_map));
     __ str(new_map_reg, FieldMemOperand(object_reg, HeapObject::kMapOffset));
     // Write barrier.
-    __ RecordWriteField(object_reg, HeapObject::kMapOffset, new_map_reg,
-                        scratch, GetLinkRegisterState(), kDontSaveFPRegs);
+    __ RecordWriteForMap(object_reg,
+                         new_map_reg,
+                         scratch,
+                         GetLinkRegisterState(),
+                         kDontSaveFPRegs);
   } else {
     ASSERT(ToRegister(instr->context()).is(cp));
     ASSERT(object_reg.is(r0));
     PushSafepointRegistersScope scope(
         this, Safepoint::kWithRegistersAndDoubles);
     __ Move(r1, to_map);
     bool is_js_array = from_map->instance_type() == JS_ARRAY_TYPE;
     TransitionElementsKindStub stub(isolate(), from_kind, to_kind, is_js_array);
     __ CallStub(&stub);
     RecordSafepointWithRegistersAndDoubles(
@@ skipping 1412 matching lines @@
   __ ldr(result, FieldMemOperand(scratch,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ bind(deferred->exit());
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal