[stubs] Introduce ToNameStub to implement %_ToName.

src/crankshaft/hydrogen.cc

 // Copyright 2013 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/crankshaft/hydrogen.h"
 
 #include <sstream>
 
 #include "src/allocation-site-scopes.h"
 #include "src/ast/ast-numbering.h"
@@ skipping 12273 matching lines @@
       Add<HPushArguments>(input);
       Push(Add<HCallRuntime>(Runtime::FunctionForId(Runtime::kToInteger), 1));
       Add<HSimulate>(call->id(), FIXED_SIMULATE);
     }
     if_inputissmi.End();
     return ast_context()->ReturnValue(Pop());
   }
 }
 
 
+void HOptimizedGraphBuilder::GenerateToName(CallRuntime* call) {
+  DCHECK_EQ(1, call->arguments()->length());
+  CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
+  HValue* input = Pop();
+  if (input->type().IsSmi()) {
+    HValue* result = BuildNumberToString(input, Type::SignedSmall(zone()));
+    return ast_context()->ReturnValue(result);
+  } else if (input->type().IsTaggedNumber()) {
+    HValue* result = BuildNumberToString(input, Type::Number(zone()));
+    return ast_context()->ReturnValue(result);
+  } else if (input->type().IsString()) {
+    return ast_context()->ReturnValue(input);
+  } else {
+    Callable callable = CodeFactory::ToName(isolate());
+    HValue* stub = Add<HConstant>(callable.code());
+    HValue* values[] = {context(), input};
+    HInstruction* result =
+        New<HCallWithDescriptor>(stub, 0, callable.descriptor(),
+                                 Vector<HValue*>(values, arraysize(values)));
+    return ast_context()->ReturnInstruction(result, call->id());
+  }
+}
+
+
 void HOptimizedGraphBuilder::GenerateToObject(CallRuntime* call) {
   DCHECK_EQ(1, call->arguments()->length());
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   HValue* value = Pop();
   HValue* result = BuildToObject(value);
   return ast_context()->ReturnValue(result);
 }
 
 
 void HOptimizedGraphBuilder::GenerateToString(CallRuntime* call) {
   DCHECK_EQ(1, call->arguments()->length());
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
-  Callable callable = CodeFactory::ToString(isolate());
   HValue* input = Pop();
   if (input->type().IsString()) {
     return ast_context()->ReturnValue(input);
   } else {
+    Callable callable = CodeFactory::ToString(isolate());
     HValue* stub = Add<HConstant>(callable.code());
     HValue* values[] = {context(), input};
     HInstruction* result =
         New<HCallWithDescriptor>(stub, 0, callable.descriptor(),
                                  Vector<HValue*>(values, arraysize(values)));
     return ast_context()->ReturnInstruction(result, call->id());
   }
 }
 
 
@@ skipping 1295 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8