v8natives.js

// Copyright 2012 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.

(function(global, utils) {

%CheckIsBootstrapping();

// ----------------------------------------------------------------------------
// Imports

var GlobalNumber = global.Number;
var GlobalObject = global.Object;
var iteratorSymbol = utils.ImportNow("iterator_symbol");
var NaN = %GetRootNaN();
var ObjectToString = utils.ImportNow("object_to_string");

// ----------------------------------------------------------------------------


// ES6 18.2.5 parseInt(string, radix)
function GlobalParseInt(string, radix) {
  if (IS_UNDEFINED(radix) || radix === 10 || radix === 0) {
    // Some people use parseInt instead of Math.floor.  This
    // optimization makes parseInt on a Smi 12 times faster (60ns
    // vs 800ns).  The following optimization makes parseInt on a
    // non-Smi number 9 times faster (230ns vs 2070ns).  Together
    // they make parseInt on a string 1.4% slower (274ns vs 270ns).
    if (%_IsSmi(string)) return string;
    if (IS_NUMBER(string) &&
        ((0.01 < string && string < 1e9) ||
            (-1e9 < string && string < -0.01))) {
      // Truncate number.
      return string | 0;
    }
    string = TO_STRING(string);
    radix = radix | 0;
  } else {
    // The spec says ToString should be evaluated before ToInt32.
    string = TO_STRING(string);
    radix = TO_INT32(radix);
    if (!(radix == 0 || (2 <= radix && radix <= 36))) {
      return NaN;
    }
  }

  if (%_HasCachedArrayIndex(string) &&
      (radix == 0 || radix == 10)) {
    return %_GetCachedArrayIndex(string);
  }
  return %StringParseInt(string, radix);
}


// ES6 18.2.4 parseFloat(string)
function GlobalParseFloat(string) {
  // 1. Let inputString be ? ToString(string).
  string = TO_STRING(string);
  if (%_HasCachedArrayIndex(string)) return %_GetCachedArrayIndex(string);
  return %StringParseFloat(string);
}


// ----------------------------------------------------------------------------

// Set up global object.
var attributes = DONT_ENUM | DONT_DELETE | READ_ONLY;

utils.InstallConstants(global, [
  // ES6 18.1.1
  "Infinity", INFINITY,
  // ES6 18.1.2
  "NaN", NaN,
  // ES6 18.1.3
  "undefined", UNDEFINED,
]);

// Set up non-enumerable function on the global object.
utils.InstallFunctions(global, DONT_ENUM, [
  "parseInt", GlobalParseInt,
  "parseFloat", GlobalParseFloat,
]);


// ----------------------------------------------------------------------------
// Object

// ES6 19.1.3.5 Object.prototype.toLocaleString([reserved1 [,reserved2]])
function ObjectToLocaleString() {
  CHECK_OBJECT_COERCIBLE(this, "Object.prototype.toLocaleString");
  return this.toString();
}


// ES6 19.1.3.7 Object.prototype.valueOf()
function ObjectValueOf() {
  return TO_OBJECT(this);
}


// ES6 19.1.3.3 Object.prototype.isPrototypeOf(V)
function ObjectIsPrototypeOf(V) {
  if (!IS_RECEIVER(V)) return false;
  var O = TO_OBJECT(this);
  return %HasInPrototypeChain(V, O);
}


// ES6 7.3.9
function GetMethod(obj, p) {
  var func = obj[p];
  if (IS_NULL_OR_UNDEFINED(func)) return UNDEFINED;
  if (IS_CALLABLE(func)) return func;
  throw %make_type_error(kCalledNonCallable, typeof func);
}

// ES6 section 19.1.2.18.
function ObjectSetPrototypeOf(obj, proto) {
  CHECK_OBJECT_COERCIBLE(obj, "Object.setPrototypeOf");

  if (proto !== null && !IS_RECEIVER(proto)) {
    throw %make_type_error(kProtoObjectOrNull, proto);
  }

  if (IS_RECEIVER(obj)) {
    %SetPrototype(obj, proto);
  }

  return obj;
}

// ES6 B.2.2.1.1
function ObjectGetProto() {
  return %object_get_prototype_of(this);
}


// ES6 B.2.2.1.2
function ObjectSetProto(proto) {
  CHECK_OBJECT_COERCIBLE(this, "Object.prototype.__proto__");

  if ((IS_RECEIVER(proto) || IS_NULL(proto)) && IS_RECEIVER(this)) {
    %SetPrototype(this, proto);
  }
}


// ES6 19.1.1.1
function ObjectConstructor(x) {
  if (GlobalObject != new.target && !IS_UNDEFINED(new.target)) {
    return this;
  }
  if (IS_NULL(x) || IS_UNDEFINED(x)) return {};
  return TO_OBJECT(x);
}


// ----------------------------------------------------------------------------
// Object

%SetNativeFlag(GlobalObject);
%SetCode(GlobalObject, ObjectConstructor);

%AddNamedProperty(GlobalObject.prototype, "constructor", GlobalObject,
                  DONT_ENUM);

// Set up non-enumerable functions on the Object.prototype object.
utils.InstallFunctions(GlobalObject.prototype, DONT_ENUM, [
  "toString", ObjectToString,
  "toLocaleString", ObjectToLocaleString,
  "valueOf", ObjectValueOf,
  "isPrototypeOf", ObjectIsPrototypeOf,
  // propertyIsEnumerable is added in bootstrapper.cc.
  // __defineGetter__ is added in bootstrapper.cc.
  // __lookupGetter__ is added in bootstrapper.cc.
  // __defineSetter__ is added in bootstrapper.cc.
  // __lookupSetter__ is added in bootstrapper.cc.
]);
utils.InstallGetterSetter(
    GlobalObject.prototype, "__proto__", ObjectGetProto, ObjectSetProto);

// Set up non-enumerable functions in the Object object.
utils.InstallFunctions(GlobalObject, DONT_ENUM, [
  "setPrototypeOf", ObjectSetPrototypeOf,
  // getOwnPropertySymbols is added in symbol.js.
  // Others are added in bootstrapper.cc.
]);



// ----------------------------------------------------------------------------
// Number

utils.InstallConstants(GlobalNumber, [
  // ECMA-262 section 15.7.3.1.
  "MAX_VALUE", 1.7976931348623157e+308,
  // ECMA-262 section 15.7.3.2.
  "MIN_VALUE", 5e-324,
  // ECMA-262 section 15.7.3.3.
  "NaN", NaN,
  // ECMA-262 section 15.7.3.4.
  "NEGATIVE_INFINITY", -INFINITY,
  // ECMA-262 section 15.7.3.5.
  "POSITIVE_INFINITY", INFINITY,

  // --- Harmony constants (no spec refs until settled.)

  "MAX_SAFE_INTEGER", 9007199254740991,
  "MIN_SAFE_INTEGER", -9007199254740991,
  "EPSILON", 2.220446049250313e-16,
]);

// Harmony Number constructor additions
utils.InstallFunctions(GlobalNumber, DONT_ENUM, [
  "parseInt", GlobalParseInt,
  "parseFloat", GlobalParseFloat
]);



// ----------------------------------------------------------------------------
// Iterator related spec functions.

// ES6 7.4.1 GetIterator(obj, method)
function GetIterator(obj, method) {
  if (IS_UNDEFINED(method)) {
    method = obj[iteratorSymbol];
  }
  if (!IS_CALLABLE(method)) {
    throw %make_type_error(kNotIterable, obj);
  }
  var iterator = %_Call(method, obj);
  if (!IS_RECEIVER(iterator)) {
    throw %make_type_error(kNotAnIterator, iterator);
  }
  return iterator;
}

// ----------------------------------------------------------------------------
// Exports

utils.Export(function(to) {
  to.GetIterator = GetIterator;
  to.GetMethod = GetMethod;
  to.ObjectHasOwnProperty = GlobalObject.prototype.hasOwnProperty;
});

%InstallToContext([
  "object_value_of", ObjectValueOf,
]);

})