[turbofan] Introduce JSToInteger and JSToLength operators.

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 "src/base/flags.h"
 #include "src/bootstrapper.h"
 #include "src/compilation-dependencies.h"
 #include "src/compiler/common-operator.h"
@@ skipping 403 matching lines @@
   }
   return Type::Boolean();
 }
 
 
 // static
 Type* Typer::Visitor::ToInteger(Type* type, Typer* t) {
   // ES6 section 7.1.4 ToInteger ( argument )
   type = ToNumber(type, t);
   if (type->Is(t->cache_.kIntegerOrMinusZero)) return type;
+  if (type->Is(t->cache_.kIntegerOrMinusZeroOrNaN)) {
+    return Type::Union(
+        Type::Intersect(type, t->cache_.kIntegerOrMinusZero, t->zone()),
+        t->cache_.kSingletonZero, t->zone());
+  }
   return t->cache_.kIntegerOrMinusZero;
 }
 
 
 // static
 Type* Typer::Visitor::ToLength(Type* type, Typer* t) {
   // ES6 section 7.1.15 ToLength ( argument )
   type = ToInteger(type, t);
   double min = type->Min();
   double max = type->Max();
@@ skipping 804 matching lines @@
 }
 
 
 // JS conversion operators.
 
 
 Type* Typer::Visitor::TypeJSToBoolean(Node* node) {
   return TypeUnaryOp(node, ToBoolean);
 }
 
+Type* Typer::Visitor::TypeJSToInteger(Node* node) {
+  return TypeUnaryOp(node, ToInteger);
+}
+
+Type* Typer::Visitor::TypeJSToLength(Node* node) {
+  return TypeUnaryOp(node, ToLength);
+}
+
+Type* Typer::Visitor::TypeJSToName(Node* node) {
+  return TypeUnaryOp(node, ToName);
+}
 
 Type* Typer::Visitor::TypeJSToNumber(Node* node) {
   return TypeUnaryOp(node, ToNumber);
 }
 
+Type* Typer::Visitor::TypeJSToObject(Node* node) {
+  return TypeUnaryOp(node, ToObject);
+}
 
 Type* Typer::Visitor::TypeJSToString(Node* node) {
   return TypeUnaryOp(node, ToString);
 }
 
-
-Type* Typer::Visitor::TypeJSToName(Node* node) {
-  return TypeUnaryOp(node, ToName);
-}
-
-
-Type* Typer::Visitor::TypeJSToObject(Node* node) {
-  return TypeUnaryOp(node, ToObject);
-}
-
-
 // JS object operators.
 
 
 Type* Typer::Visitor::TypeJSCreate(Node* node) { return Type::Object(); }
 
 
 Type* Typer::Visitor::TypeJSCreateArguments(Node* node) {
   return Type::OtherObject();
 }
 
@@ skipping 1245 matching lines @@
   }
   if (Type::IsInteger(*value)) {
     return Type::Range(value->Number(), value->Number(), zone());
   }
   return Type::Constant(value, zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8