Load callback data from weak cell instead of embedding it in handler.

src/ic/mips/handler-compiler-mips.cc

 // Copyright 2014 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"
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/ic/call-optimization.h"
 #include "src/ic/handler-compiler.h"
@@ skipping 541 matching lines @@
   STATIC_ASSERT(PropertyCallbackArguments::kIsolateIndex == 1);
   STATIC_ASSERT(PropertyCallbackArguments::kReturnValueDefaultValueIndex == 2);
   STATIC_ASSERT(PropertyCallbackArguments::kReturnValueOffset == 3);
   STATIC_ASSERT(PropertyCallbackArguments::kDataIndex == 4);
   STATIC_ASSERT(PropertyCallbackArguments::kThisIndex == 5);
   STATIC_ASSERT(PropertyCallbackArguments::kArgsLength == 6);
   DCHECK(!scratch2().is(reg));
   DCHECK(!scratch3().is(reg));
   DCHECK(!scratch4().is(reg));
   __ push(receiver());
-  if (heap()->InNewSpace(callback->data())) {
-    __ li(scratch3(), callback);
-    __ lw(scratch3(),
-          FieldMemOperand(scratch3(), ExecutableAccessorInfo::kDataOffset));
+  Handle<Object> data(callback->data(), isolate());
+  if (data->IsUndefined() || data->IsSmi()) {
+    __ li(scratch3(), data);
   } else {
-    __ li(scratch3(), Handle<Object>(callback->data(), isolate()));
+    Handle<WeakCell> cell =
+        isolate()->factory()->NewWeakCell(Handle<HeapObject>::cast(data));
+    // The callback is alive if this instruction is executed,
+    // so the weak cell is not cleared and points to data.
+    __ GetWeakValue(scratch3(), cell);
   }
   __ Subu(sp, sp, 6 * kPointerSize);
   __ sw(scratch3(), MemOperand(sp, 5 * kPointerSize));
   __ LoadRoot(scratch3(), Heap::kUndefinedValueRootIndex);
   __ sw(scratch3(), MemOperand(sp, 4 * kPointerSize));
   __ sw(scratch3(), MemOperand(sp, 3 * kPointerSize));
   __ li(scratch4(), Operand(ExternalReference::isolate_address(isolate())));
   __ sw(scratch4(), MemOperand(sp, 2 * kPointerSize));
   __ sw(reg, MemOperand(sp, 1 * kPointerSize));
   __ sw(name(), MemOperand(sp, 0 * kPointerSize));
@@ skipping 161 matching lines @@
   // Return the generated code.
   return GetCode(kind(), Code::NORMAL, name);
 }
 
 
 #undef __
 }
 }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS