[heap] User safer root set accessor when possible.

src/ia32/macro-assembler-ia32.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_IA32
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 48 matching lines @@
     } else if (r.IsSmi()) {
       AssertSmi(src);
     }
     mov(dst, src);
   }
 }
 
 
 void MacroAssembler::LoadRoot(Register destination, Heap::RootListIndex index) {
   if (isolate()->heap()->RootCanBeTreatedAsConstant(index)) {
-    Handle<Object> value(&isolate()->heap()->roots_array_start()[index]);
-    mov(destination, value);
+    mov(destination, isolate()->heap()->root_handle(index));
     return;
   }
   ExternalReference roots_array_start =
       ExternalReference::roots_array_start(isolate());
   mov(destination, Immediate(index));
   mov(destination, Operand::StaticArray(destination,
                                         times_pointer_size,
                                         roots_array_start));
 }
 
@@ skipping 17 matching lines @@
       ExternalReference::roots_array_start(isolate());
   mov(scratch, Immediate(index));
   cmp(with, Operand::StaticArray(scratch,
                                 times_pointer_size,
                                 roots_array_start));
 }
 
 
 void MacroAssembler::CompareRoot(Register with, Heap::RootListIndex index) {
   DCHECK(isolate()->heap()->RootCanBeTreatedAsConstant(index));
-  Handle<Object> value(&isolate()->heap()->roots_array_start()[index]);
-  cmp(with, value);
+  cmp(with, isolate()->heap()->root_handle(index));
 }
 
 
 void MacroAssembler::CompareRoot(const Operand& with,
                                  Heap::RootListIndex index) {
   DCHECK(isolate()->heap()->RootCanBeTreatedAsConstant(index));
-  Handle<Object> value(&isolate()->heap()->roots_array_start()[index]);
-  cmp(with, value);
+  cmp(with, isolate()->heap()->root_handle(index));
 }
 
 
 void MacroAssembler::InNewSpace(
     Register object,
     Register scratch,
     Condition cc,
     Label* condition_met,
     Label::Distance condition_met_distance) {
   DCHECK(cc == equal || cc == not_equal);
@@ skipping 3058 matching lines @@
   mov(eax, dividend);
   shr(eax, 31);
   add(edx, eax);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32