Fix typeof optimization for undetectable

src/compiler/typer.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/compiler/typer.h"
 
 #include <iomanip>
 
 #include "src/base/flags.h"
 #include "src/bootstrapper.h"
@@ skipping 273 matching lines @@
   SIMPLIFIED_SPECULATIVE_NUMBER_BINOP_LIST(DECLARE_METHOD)
 #undef DECLARE_METHOD
 
   static Type* ObjectIsCallable(Type*, Typer*);
   static Type* ObjectIsNonCallable(Type*, Typer*);
   static Type* ObjectIsNumber(Type*, Typer*);
   static Type* ObjectIsReceiver(Type*, Typer*);
   static Type* ObjectIsSmi(Type*, Typer*);
   static Type* ObjectIsString(Type*, Typer*);
   static Type* ObjectIsUndetectable(Type*, Typer*);
+  static Type* TypeOfIsFunction(Type*, Typer*);
 
   static ComparisonOutcome JSCompareTyper(Type*, Type*, Typer*);
 
 #define DECLARE_METHOD(x) static Type* x##Typer(Type*, Type*, Typer*);
   JS_SIMPLE_BINOP_LIST(DECLARE_METHOD)
 #undef DECLARE_METHOD
 
   static Type* JSCallTyper(Type*, Typer*);
 
   static Type* ReferenceEqualTyper(Type*, Type*, Typer*);
@@ skipping 235 matching lines @@
   if (!type->Maybe(Type::String())) return t->singleton_false_;
   return Type::Boolean();
 }
 
 Type* Typer::Visitor::ObjectIsUndetectable(Type* type, Typer* t) {
   if (type->Is(Type::Undetectable())) return t->singleton_true_;
   if (!type->Maybe(Type::Undetectable())) return t->singleton_false_;
   return Type::Boolean();
 }
 
+Type* Typer::Visitor::TypeOfIsFunction(Type* type, Typer* t) {
+  if (type->Is(Type::Function())) return t->singleton_true_;
+  if (!type->Maybe(Type::Function())) return t->singleton_false_;
+  return Type::Boolean();
+}
 
 // -----------------------------------------------------------------------------
 
 
 // Control operators.
 
 Type* Typer::Visitor::TypeStart(Node* node) { return Type::Internal(); }
 
 Type* Typer::Visitor::TypeIfException(Node* node) {
   return Type::NonInternal();
@@ skipping 1360 matching lines @@
 }
 
 Type* Typer::Visitor::TypeObjectIsString(Node* node) {
   return TypeUnaryOp(node, ObjectIsString);
 }
 
 Type* Typer::Visitor::TypeObjectIsUndetectable(Node* node) {
   return TypeUnaryOp(node, ObjectIsUndetectable);
 }
 
+Type* Typer::Visitor::TypeTypeOfIsFunction(Node* node) {
+  return TypeUnaryOp(node, TypeOfIsFunction);
+}
+
 Type* Typer::Visitor::TypeNewUnmappedArgumentsElements(Node* node) {
   return Type::OtherInternal();
 }
 
 Type* Typer::Visitor::TypeNewRestParameterElements(Node* node) {
   return Type::OtherInternal();
 }
 
 Type* Typer::Visitor::TypeArrayBufferWasNeutered(Node* node) {
   return Type::Boolean();
 }
 
 // Heap constants.
 
 Type* Typer::Visitor::TypeConstant(Handle<Object> value) {
   if (Type::IsInteger(*value)) {
     return Type::Range(value->Number(), value->Number(), zone());
   }
   return Type::NewConstant(value, zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8