Reland [heap] Avoid the use of cells to point from code to new-space objects.

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 2577 matching lines @@
   // The registers are pushed starting with the lowest encoding,
   // which means that lowest encodings are furthest away from
   // the stack pointer.
   DCHECK(reg_code >= 0 && reg_code < kNumSafepointRegisters);
   return kNumSafepointRegisters - reg_code - 1;
 }
 
 
 void MacroAssembler::LoadHeapObject(Register result,
                                     Handle<HeapObject> object) {
-  AllowDeferredHandleDereference embedding_raw_address;
-  if (isolate()->heap()->InNewSpace(*object)) {
-    Handle<Cell> cell = isolate()->factory()->NewCell(object);
-    mov(result, Operand::ForCell(cell));
-  } else {
-    mov(result, object);
-  }
+  mov(result, object);
 }
 
 
 void MacroAssembler::CmpHeapObject(Register reg, Handle<HeapObject> object) {
-  AllowDeferredHandleDereference using_raw_address;
-  if (isolate()->heap()->InNewSpace(*object)) {
-    Handle<Cell> cell = isolate()->factory()->NewCell(object);
-    cmp(reg, Operand::ForCell(cell));
-  } else {
-    cmp(reg, object);
-  }
+  cmp(reg, object);
 }
 
-
-void MacroAssembler::PushHeapObject(Handle<HeapObject> object) {
-  AllowDeferredHandleDereference using_raw_address;
-  if (isolate()->heap()->InNewSpace(*object)) {
-    Handle<Cell> cell = isolate()->factory()->NewCell(object);
-    push(Operand::ForCell(cell));
-  } else {
-    Push(object);
-  }
-}
-
+void MacroAssembler::PushHeapObject(Handle<HeapObject> object) { Push(object); }
 
 void MacroAssembler::CmpWeakValue(Register value, Handle<WeakCell> cell,
                                   Register scratch) {
   mov(scratch, cell);
   cmp(value, FieldOperand(scratch, WeakCell::kValueOffset));
 }
 
 
 void MacroAssembler::GetWeakValue(Register value, Handle<WeakCell> cell) {
   mov(value, cell);
@@ skipping 817 matching lines @@
   mov(eax, dividend);
   shr(eax, 31);
   add(edx, eax);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32