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// Copyright 2006-2008 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// This files contains runtime support implemented in JavaScript.
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// CAUTION: Some of the functions specified in this file are called
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// directly from compiled code. These are the functions with names in
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// ALL CAPS. The compiled code passes the first argument in 'this' and
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// it does not push the function onto the stack. This means that you
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// cannot use contexts in all these functions.
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/* -----------------------------------
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- - - C o m p a r i s o n - - -
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-----------------------------------
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// The following declarations are shared with other native JS files.
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// They are all declared at this one spot to avoid redeclaration errors.
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var $Object = global.Object;
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var $Array = global.Array;
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var $String = global.String;
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var $Number = global.Number;
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var $Function = global.Function;
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var $Boolean = global.Boolean;
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var $NaN = %GetRootNaN();
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// ECMA-262 Section 11.9.3.
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if (IS_STRING(this) && IS_STRING(y)) return %StringEquals(this, y);
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if (IS_NUMBER(y)) return %NumberEquals(x, y);
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if (IS_NULL_OR_UNDEFINED(y)) return 1; // not equal
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if (!IS_SPEC_OBJECT(y)) {
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return %NumberEquals(x, %ToNumber(y));
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y = %ToPrimitive(y, NO_HINT);
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} else if (IS_STRING(x)) {
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if (IS_STRING(y)) return %StringEquals(x, y);
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if (IS_NUMBER(y)) return %NumberEquals(%ToNumber(x), y);
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if (IS_BOOLEAN(y)) return %NumberEquals(%ToNumber(x), %ToNumber(y));
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if (IS_NULL_OR_UNDEFINED(y)) return 1; // not equal
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y = %ToPrimitive(y, NO_HINT);
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} else if (IS_BOOLEAN(x)) {
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if (IS_BOOLEAN(y)) return %_ObjectEquals(x, y) ? 0 : 1;
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if (IS_NULL_OR_UNDEFINED(y)) return 1;
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if (IS_NUMBER(y)) return %NumberEquals(%ToNumber(x), y);
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if (IS_STRING(y)) return %NumberEquals(%ToNumber(x), %ToNumber(y));
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y = %ToPrimitive(y, NO_HINT);
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} else if (IS_NULL_OR_UNDEFINED(x)) {
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return IS_NULL_OR_UNDEFINED(y) ? 0 : 1;
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if (IS_SPEC_OBJECT(y)) {
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return %_ObjectEquals(x, y) ? 0 : 1;
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if (IS_NULL_OR_UNDEFINED(y)) return 1; // not equal
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if (IS_BOOLEAN(y)) y = %ToNumber(y);
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x = %ToPrimitive(x, NO_HINT);
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// ECMA-262, section 11.9.4, page 56.
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function STRICT_EQUALS(x) {
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if (IS_STRING(this)) {
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if (!IS_STRING(x)) return 1; // not equal
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return %StringEquals(this, x);
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if (IS_NUMBER(this)) {
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if (!IS_NUMBER(x)) return 1; // not equal
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return %NumberEquals(this, x);
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// If anything else gets here, we just do simple identity check.
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// Objects (including functions), null, undefined and booleans were
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// checked in the CompareStub, so there should be nothing left.
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return %_ObjectEquals(this, x) ? 0 : 1;
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// ECMA-262, section 11.8.5, page 53. The 'ncr' parameter is used as
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// the result when either (or both) the operands are NaN.
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function COMPARE(x, ncr) {
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// Fast cases for string, numbers and undefined compares.
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if (IS_STRING(this)) {
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if (IS_STRING(x)) return %_StringCompare(this, x);
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if (IS_UNDEFINED(x)) return ncr;
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} else if (IS_NUMBER(this)) {
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if (IS_NUMBER(x)) return %NumberCompare(this, x, ncr);
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if (IS_UNDEFINED(x)) return ncr;
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} else if (IS_UNDEFINED(this)) {
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if (!IS_UNDEFINED(x)) {
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%ToPrimitive(x, NUMBER_HINT);
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} else if (IS_UNDEFINED(x)) {
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%ToPrimitive(this, NUMBER_HINT);
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left = %ToPrimitive(this, NUMBER_HINT);
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right = %ToPrimitive(x, NUMBER_HINT);
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if (IS_STRING(left) && IS_STRING(right)) {
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return %_StringCompare(left, right);
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var left_number = %ToNumber(left);
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var right_number = %ToNumber(right);
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if (NUMBER_IS_NAN(left_number) || NUMBER_IS_NAN(right_number)) return ncr;
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return %NumberCompare(left_number, right_number, ncr);
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/* -----------------------------------
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- - - A r i t h m e t i c - - -
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-----------------------------------
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// ECMA-262, section 11.6.1, page 50.
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// Fast case: Check for number operands and do the addition.
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if (IS_NUMBER(this) && IS_NUMBER(x)) return %NumberAdd(this, x);
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if (IS_STRING(this) && IS_STRING(x)) return %_StringAdd(this, x);
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// Default implementation.
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var a = %ToPrimitive(this, NO_HINT);
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var b = %ToPrimitive(x, NO_HINT);
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return %_StringAdd(a, %ToString(b));
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} else if (IS_STRING(b)) {
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return %_StringAdd(%NonStringToString(a), b);
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return %NumberAdd(%ToNumber(a), %ToNumber(b));
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// Left operand (this) is already a string.
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function STRING_ADD_LEFT(y) {
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if (IS_STRING_WRAPPER(y) && %_IsStringWrapperSafeForDefaultValueOf(y)) {
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? %_NumberToString(y)
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: %ToString(%ToPrimitive(y, NO_HINT));
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return %_StringAdd(this, y);
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// Right operand (y) is already a string.
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function STRING_ADD_RIGHT(y) {
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if (IS_STRING_WRAPPER(x) && %_IsStringWrapperSafeForDefaultValueOf(x)) {
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? %_NumberToString(x)
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: %ToString(%ToPrimitive(x, NO_HINT));
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return %_StringAdd(x, y);
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// ECMA-262, section 11.6.2, page 50.
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var x = IS_NUMBER(this) ? this : %NonNumberToNumber(this);
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if (!IS_NUMBER(y)) y = %NonNumberToNumber(y);
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return %NumberSub(x, y);
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// ECMA-262, section 11.5.1, page 48.
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var x = IS_NUMBER(this) ? this : %NonNumberToNumber(this);
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if (!IS_NUMBER(y)) y = %NonNumberToNumber(y);
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return %NumberMul(x, y);
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// ECMA-262, section 11.5.2, page 49.
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var x = IS_NUMBER(this) ? this : %NonNumberToNumber(this);
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if (!IS_NUMBER(y)) y = %NonNumberToNumber(y);
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return %NumberDiv(x, y);
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// ECMA-262, section 11.5.3, page 49.
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var x = IS_NUMBER(this) ? this : %NonNumberToNumber(this);
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if (!IS_NUMBER(y)) y = %NonNumberToNumber(y);
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return %NumberMod(x, y);
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/* -------------------------------------------
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- - - B i t o p e r a t i o n s - - -
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-------------------------------------------
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// ECMA-262, section 11.10, page 57.
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var x = IS_NUMBER(this) ? this : %NonNumberToNumber(this);
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if (!IS_NUMBER(y)) y = %NonNumberToNumber(y);
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return %NumberOr(x, y);
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// ECMA-262, section 11.10, page 57.
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function BIT_AND(y) {
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if (IS_NUMBER(this)) {
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if (!IS_NUMBER(y)) y = %NonNumberToNumber(y);
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x = %NonNumberToNumber(this);
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// Make sure to convert the right operand to a number before
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// bailing out in the fast case, but after converting the
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// left operand. This ensures that valueOf methods on the right
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// operand are always executed.
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if (!IS_NUMBER(y)) y = %NonNumberToNumber(y);
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// Optimize for the case where we end up AND'ing a value
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// that doesn't convert to a number. This is common in
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// certain benchmarks.
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if (NUMBER_IS_NAN(x)) return 0;
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return %NumberAnd(x, y);
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// ECMA-262, section 11.10, page 57.
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function BIT_XOR(y) {
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var x = IS_NUMBER(this) ? this : %NonNumberToNumber(this);
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if (!IS_NUMBER(y)) y = %NonNumberToNumber(y);
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return %NumberXor(x, y);
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// ECMA-262, section 11.4.7, page 47.
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function UNARY_MINUS() {
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var x = IS_NUMBER(this) ? this : %NonNumberToNumber(this);
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return %NumberUnaryMinus(x);
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// ECMA-262, section 11.4.8, page 48.
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var x = IS_NUMBER(this) ? this : %NonNumberToNumber(this);
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return %NumberNot(x);
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// ECMA-262, section 11.7.1, page 51.
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var x = IS_NUMBER(this) ? this : %NonNumberToNumber(this);
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if (!IS_NUMBER(y)) y = %NonNumberToNumber(y);
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return %NumberShl(x, y);
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// ECMA-262, section 11.7.2, page 51.
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if (IS_NUMBER(this)) {
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if (!IS_NUMBER(y)) y = %NonNumberToNumber(y);
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x = %NonNumberToNumber(this);
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// Make sure to convert the right operand to a number before
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// bailing out in the fast case, but after converting the
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// left operand. This ensures that valueOf methods on the right
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// operand are always executed.
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if (!IS_NUMBER(y)) y = %NonNumberToNumber(y);
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// Optimize for the case where we end up shifting a value
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// that doesn't convert to a number. This is common in
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// certain benchmarks.
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if (NUMBER_IS_NAN(x)) return 0;
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return %NumberSar(x, y);
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// ECMA-262, section 11.7.3, page 52.
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var x = IS_NUMBER(this) ? this : %NonNumberToNumber(this);
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if (!IS_NUMBER(y)) y = %NonNumberToNumber(y);
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return %NumberShr(x, y);
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/* -----------------------------
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- - - H e l p e r s - - -
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-----------------------------
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// ECMA-262, section 11.4.1, page 46.
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function DELETE(key, strict) {
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return %DeleteProperty(%ToObject(this), %ToString(key), strict);
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// ECMA-262, section 11.8.7, page 54.
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if (!IS_SPEC_OBJECT(x)) {
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throw %MakeTypeError('invalid_in_operator_use', [this, x]);
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return %_IsNonNegativeSmi(this) ?
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%HasElement(x, this) : %HasProperty(x, %ToString(this));
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// ECMA-262, section 11.8.6, page 54. To make the implementation more
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// efficient, the return value should be zero if the 'this' is an
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// instance of F, and non-zero if not. This makes it possible to avoid
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// an expensive ToBoolean conversion in the generated code.
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function INSTANCE_OF(F) {
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if (!IS_SPEC_FUNCTION(F)) {
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throw %MakeTypeError('instanceof_function_expected', [V]);
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// If V is not an object, return false.
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if (!IS_SPEC_OBJECT(V)) {
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// Check if function is bound, if so, get [[BoundFunction]] from it
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// and use that instead of F.
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var bindings = %BoundFunctionGetBindings(F);
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F = bindings[kBoundFunctionIndex]; // Always a non-bound function.
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// Get the prototype of F; if it is not an object, throw an error.
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if (!IS_SPEC_OBJECT(O)) {
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throw %MakeTypeError('instanceof_nonobject_proto', [O]);
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// Return whether or not O is in the prototype chain of V.
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return %IsInPrototypeChain(O, V) ? 0 : 1;
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// Filter a given key against an object by checking if the object
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// has a property with the given key; return the key as a string if
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// it has. Otherwise returns 0 (smi). Used in for-in statements.
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function FILTER_KEY(key) {
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var string = %ToString(key);
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if (%HasProperty(this, string)) return string;
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function CALL_NON_FUNCTION() {
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var delegate = %GetFunctionDelegate(this);
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if (!IS_FUNCTION(delegate)) {
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throw %MakeTypeError('called_non_callable', [typeof this]);
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return %Apply(delegate, this, arguments, 0, %_ArgumentsLength());
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function CALL_NON_FUNCTION_AS_CONSTRUCTOR() {
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var delegate = %GetConstructorDelegate(this);
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if (!IS_FUNCTION(delegate)) {
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throw %MakeTypeError('called_non_callable', [typeof this]);
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return %Apply(delegate, this, arguments, 0, %_ArgumentsLength());
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function CALL_FUNCTION_PROXY() {
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var arity = %_ArgumentsLength() - 1;
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var proxy = %_Arguments(arity); // The proxy comes in as an additional arg.
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var trap = %GetCallTrap(proxy);
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return %Apply(trap, this, arguments, 0, arity);
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function CALL_FUNCTION_PROXY_AS_CONSTRUCTOR() {
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var trap = %GetConstructTrap(proxy);
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return %Apply(trap, this, arguments, 0, %_ArgumentsLength());
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function APPLY_PREPARE(args) {
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// First check whether length is a positive Smi and args is an
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// array. This is the fast case. If this fails, we do the slow case
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// that takes care of more eventualities.
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if (IS_ARRAY(args)) {
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length = args.length;
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if (%_IsSmi(length) && length >= 0 && length < 0x800000 &&
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IS_SPEC_FUNCTION(this)) {
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length = (args == null) ? 0 : %ToUint32(args.length);
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// We can handle any number of apply arguments if the stack is
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// big enough, but sanity check the value to avoid overflow when
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// multiplying with pointer size.
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if (length > 0x800000) {
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throw %MakeRangeError('stack_overflow', []);
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if (!IS_SPEC_FUNCTION(this)) {
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throw %MakeTypeError('apply_non_function',
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[ %ToString(this), typeof this ]);
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// Make sure the arguments list has the right type.
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if (args != null && !IS_SPEC_OBJECT(args)) {
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throw %MakeTypeError('apply_wrong_args', []);
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// Return the length which is the number of arguments to copy to the
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// stack. It is guaranteed to be a small integer at this point.
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function APPLY_OVERFLOW(length) {
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throw %MakeRangeError('stack_overflow', []);
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// Convert the receiver to an object - forward to ToObject.
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function TO_OBJECT() {
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return %ToObject(this);
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// Convert the receiver to a number - forward to ToNumber.
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function TO_NUMBER() {
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return %ToNumber(this);
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// Convert the receiver to a string - forward to ToString.
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function TO_STRING() {
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return %ToString(this);
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/* -------------------------------------
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- - - C o n v e r s i o n s - - -
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-------------------------------------
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// ECMA-262, section 9.1, page 30. Use null/undefined for no hint,
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// (1) for number hint, and (2) for string hint.
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function ToPrimitive(x, hint) {
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if (IS_STRING(x)) return x;
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if (!IS_SPEC_OBJECT(x)) return x;
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if (hint == NO_HINT) hint = (IS_DATE(x)) ? STRING_HINT : NUMBER_HINT;
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return (hint == NUMBER_HINT) ? %DefaultNumber(x) : %DefaultString(x);
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// ECMA-262, section 9.2, page 30
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function ToBoolean(x) {
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if (IS_BOOLEAN(x)) return x;
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if (IS_STRING(x)) return x.length != 0;
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if (x == null) return false;
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if (IS_NUMBER(x)) return !((x == 0) || NUMBER_IS_NAN(x));
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// ECMA-262, section 9.3, page 31.
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function ToNumber(x) {
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if (IS_NUMBER(x)) return x;
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return %_HasCachedArrayIndex(x) ? %_GetCachedArrayIndex(x)
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: %StringToNumber(x);
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if (IS_BOOLEAN(x)) return x ? 1 : 0;
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if (IS_UNDEFINED(x)) return $NaN;
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return (IS_NULL(x)) ? 0 : ToNumber(%DefaultNumber(x));
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function NonNumberToNumber(x) {
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return %_HasCachedArrayIndex(x) ? %_GetCachedArrayIndex(x)
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: %StringToNumber(x);
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if (IS_BOOLEAN(x)) return x ? 1 : 0;
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if (IS_UNDEFINED(x)) return $NaN;
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return (IS_NULL(x)) ? 0 : ToNumber(%DefaultNumber(x));
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// ECMA-262, section 9.8, page 35.
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function ToString(x) {
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if (IS_STRING(x)) return x;
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if (IS_NUMBER(x)) return %_NumberToString(x);
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if (IS_BOOLEAN(x)) return x ? 'true' : 'false';
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if (IS_UNDEFINED(x)) return 'undefined';
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return (IS_NULL(x)) ? 'null' : %ToString(%DefaultString(x));
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function NonStringToString(x) {
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if (IS_NUMBER(x)) return %_NumberToString(x);
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if (IS_BOOLEAN(x)) return x ? 'true' : 'false';
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if (IS_UNDEFINED(x)) return 'undefined';
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return (IS_NULL(x)) ? 'null' : %ToString(%DefaultString(x));
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// ECMA-262, section 9.9, page 36.
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function ToObject(x) {
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if (IS_STRING(x)) return new $String(x);
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if (IS_NUMBER(x)) return new $Number(x);
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if (IS_BOOLEAN(x)) return new $Boolean(x);
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if (IS_NULL_OR_UNDEFINED(x) && !IS_UNDETECTABLE(x)) {
572
throw %MakeTypeError('null_to_object', []);
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// ECMA-262, section 9.4, page 34.
579
function ToInteger(x) {
580
if (%_IsSmi(x)) return x;
581
return %NumberToInteger(ToNumber(x));
585
// ECMA-262, section 9.6, page 34.
586
function ToUint32(x) {
587
if (%_IsSmi(x) && x >= 0) return x;
588
return %NumberToJSUint32(ToNumber(x));
592
// ECMA-262, section 9.5, page 34
593
function ToInt32(x) {
594
if (%_IsSmi(x)) return x;
595
return %NumberToJSInt32(ToNumber(x));
600
function SameValue(x, y) {
601
if (typeof x != typeof y) return false;
603
if (NUMBER_IS_NAN(x) && NUMBER_IS_NAN(y)) return true;
604
// x is +0 and y is -0 or vice versa.
605
if (x === 0 && y === 0 && (1 / x) != (1 / y)) return false;
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/* ---------------------------------
612
- - - U t i l i t i e s - - -
613
---------------------------------
616
// Returns if the given x is a primitive value - not an object or a
618
function IsPrimitive(x) {
619
// Even though the type of null is "object", null is still
620
// considered a primitive value. IS_SPEC_OBJECT handles this correctly
621
// (i.e., it will return false if x is null).
622
return !IS_SPEC_OBJECT(x);
626
// ECMA-262, section 8.6.2.6, page 28.
627
function DefaultNumber(x) {
628
var valueOf = x.valueOf;
629
if (IS_SPEC_FUNCTION(valueOf)) {
630
var v = %_CallFunction(x, valueOf);
631
if (%IsPrimitive(v)) return v;
634
var toString = x.toString;
635
if (IS_SPEC_FUNCTION(toString)) {
636
var s = %_CallFunction(x, toString);
637
if (%IsPrimitive(s)) return s;
640
throw %MakeTypeError('cannot_convert_to_primitive', []);
644
// ECMA-262, section 8.6.2.6, page 28.
645
function DefaultString(x) {
646
var toString = x.toString;
647
if (IS_SPEC_FUNCTION(toString)) {
648
var s = %_CallFunction(x, toString);
649
if (%IsPrimitive(s)) return s;
652
var valueOf = x.valueOf;
653
if (IS_SPEC_FUNCTION(valueOf)) {
654
var v = %_CallFunction(x, valueOf);
655
if (%IsPrimitive(v)) return v;
658
throw %MakeTypeError('cannot_convert_to_primitive', []);
662
// NOTE: Setting the prototype for Array must take place as early as
663
// possible due to code generation for array literals. When
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// generating code for a array literal a boilerplate array is created
665
// that is cloned when running the code. It is essential that the
666
// boilerplate gets the right prototype.
667
%FunctionSetPrototype($Array, new $Array(0));
added
removed
src/third_party/v8/src/runtime.js
