From 99d9712bb0fbc6e6dfab9f483a36e097ac253b2e Mon Sep 17 00:00:00 2001
From: "yangguo@chromium.org"
 <yangguo@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Date: Tue, 29 Apr 2014 13:18:27 +0000
Subject: [PATCH] Return MaybeHandle from Object::ToSmi.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/260083011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@21047 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---
 src/elements.cc             | 5 +++--
 src/ic.cc                   | 5 ++---
 src/objects-inl.h           | 6 +++---
 src/objects.h               | 5 ++---
 test/cctest/test-strings.cc | 2 +-
 5 files changed, 11 insertions(+), 12 deletions(-)

diff --git a/src/elements.cc b/src/elements.cc
index 26b722b..580a718 100644
--- a/src/elements.cc
+++ b/src/elements.cc
@@ -1848,9 +1848,10 @@ MaybeHandle<Object> ElementsAccessorBase<ElementsAccessorSubclass,
   Handle<JSArray> array = Handle<JSArray>::cast(obj);
 
   // Fast case: The new length fits into a Smi.
-  Handle<Object> smi_length = Object::ToSmi(isolate, length);
+  Handle<Object> smi_length;
 
-  if (!smi_length.is_null() && smi_length->IsSmi()) {
+  if (Object::ToSmi(isolate, length).ToHandle(&smi_length) &&
+      smi_length->IsSmi()) {
     const int value = Handle<Smi>::cast(smi_length)->value();
     if (value >= 0) {
       Handle<Object> new_length = ElementsAccessorSubclass::
diff --git a/src/ic.cc b/src/ic.cc
index 475db79..f442427 100644
--- a/src/ic.cc
+++ b/src/ic.cc
@@ -1614,9 +1614,8 @@ bool IsOutOfBoundsAccess(Handle<JSObject> receiver,
 KeyedAccessStoreMode KeyedStoreIC::GetStoreMode(Handle<JSObject> receiver,
                                                 Handle<Object> key,
                                                 Handle<Object> value) {
-  Handle<Object> smi_key = Object::ToSmi(isolate(), key);
-  ASSERT(!smi_key.is_null() && smi_key->IsSmi());
-  int index = Handle<Smi>::cast(smi_key)->value();
+  Handle<Smi> smi_key = Object::ToSmi(isolate(), key).ToHandleChecked();
+  int index = smi_key->value();
   bool oob_access = IsOutOfBoundsAccess(receiver, index);
   // Don't consider this a growing store if the store would send the receiver to
   // dictionary mode.
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 3939802..de77da0 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -1037,8 +1037,8 @@ bool Object::IsNaN() {
 }
 
 
-Handle<Object> Object::ToSmi(Isolate* isolate, Handle<Object> object) {
-  if (object->IsSmi()) return object;
+MaybeHandle<Smi> Object::ToSmi(Isolate* isolate, Handle<Object> object) {
+  if (object->IsSmi()) return Handle<Smi>::cast(object);
   if (object->IsHeapNumber()) {
     double value = Handle<HeapNumber>::cast(object)->value();
     int int_value = FastD2I(value);
@@ -1046,7 +1046,7 @@ Handle<Object> Object::ToSmi(Isolate* isolate, Handle<Object> object) {
       return handle(Smi::FromInt(int_value), isolate);
     }
   }
-  return Handle<Object>();
+  return Handle<Smi>();
 }
 
 
diff --git a/src/objects.h b/src/objects.h
index 86042ac..5347309 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1490,9 +1490,8 @@ class Object : public MaybeObject {
                                           Handle<Context> context);
 
   // Converts this to a Smi if possible.
-  // Failure is returned otherwise.
-  static MUST_USE_RESULT inline Handle<Object> ToSmi(Isolate* isolate,
-                                                     Handle<Object> object);
+  static MUST_USE_RESULT inline MaybeHandle<Smi> ToSmi(Isolate* isolate,
+                                                       Handle<Object> object);
 
   void Lookup(Name* name, LookupResult* result);
 
diff --git a/test/cctest/test-strings.cc b/test/cctest/test-strings.cc
index f95000e..81294e8 100644
--- a/test/cctest/test-strings.cc
+++ b/test/cctest/test-strings.cc
@@ -1078,7 +1078,7 @@ TEST(CachedHashOverflow) {
     CHECK_EQ(results[i]->IsUndefined(), result->IsUndefined());
     CHECK_EQ(results[i]->IsNumber(), result->IsNumber());
     if (result->IsNumber()) {
-      CHECK_EQ(Handle<Smi>::cast(Object::ToSmi(isolate, results[i]))->value(),
+      CHECK_EQ(Object::ToSmi(isolate, results[i]).ToHandleChecked()->value(),
                result->ToInt32()->Value());
     }
   }
-- 
2.7.4