[stubs] Port ToName stub to TurboFan.

src/code-stub-assembler.cc

Index: src/code-stub-assembler.cc
diff --git a/src/code-stub-assembler.cc b/src/code-stub-assembler.cc
index 7ec5a88e5610048c7d9f54a990c39a50ea4b92a6..fe0123ef00ac35832611291cabd1968dbc79b155 100644
--- a/src/code-stub-assembler.cc
+++ b/src/code-stub-assembler.cc
@@ -2216,6 +2216,54 @@ Node* CodeStubAssembler::StringFromCharCode(Node* code) {
   return var_result.value();
 }
 
+Node* CodeStubAssembler::ToName(Node* context, Node* value) {
+  typedef CodeStubAssembler::Label Label;
+  typedef CodeStubAssembler::Variable Variable;
+
+  Label end(this);
+  Variable var_result(this, MachineRepresentation::kTagged);
+
+  Label is_number(this, Label::kDeferred);

[Igor Sheludko, 2016/09/06 08:23:04]

I would suggest not to use deferred labels when rewriting hand written assembly
to TurboFan since the deferred blocks are in most cases penalized by gap moves.
Please check what kind of assembly does TF generate.

+  GotoIf(WordIsSmi(value), &is_number);
+
+  Label not_name(this, Label::kDeferred);

[Igor Sheludko, 2016/09/06 08:23:04]

Same here.

+  Node* value_instance_type = LoadInstanceType(value);

[Igor Sheludko, 2016/09/06 08:23:04]

Please add
  STATIC_ASSERT(FIRST_NAME_TYPE == FIRST_TYPE);

+  GotoIf(Int32GreaterThan(value_instance_type, Int32Constant(LAST_NAME_TYPE)),
+         &not_name);
+
+  var_result.Bind(value);
+  Goto(&end);
+
+  Bind(&is_number);
+  {
+    Callable callable = CodeFactory::NumberToString(isolate());
+    var_result.Bind(CallStub(callable, context, value));
+    Goto(&end);
+  }
+
+  Bind(&not_name);
+  {
+    GotoIf(Word32Equal(value_instance_type, Int32Constant(HEAP_NUMBER_TYPE)),
+           &is_number);
+
+    Label not_oddball(this, Label::kDeferred);

[Igor Sheludko, 2016/09/06 08:23:04]

Same here.

+    GotoIf(Word32NotEqual(value_instance_type, Int32Constant(ODDBALL_TYPE)),
+           &not_oddball);
+
+    var_result.Bind(LoadObjectField(value, Oddball::kToStringOffset));
+    Goto(&end);
+
+    Bind(&not_oddball);
+    {
+      var_result.Bind(CallRuntime(Runtime::kToName, context, value));
+      Goto(&end);
+    }
+  }
+
+  Bind(&end);
+  return var_result.value();
+}
+
 Node* CodeStubAssembler::BitFieldDecode(Node* word32, uint32_t shift,
                                         uint32_t mask) {
   return Word32Shr(Word32And(word32, Int32Constant(mask)),