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main_repo / deps / v8 / src / runtime.js @ 40c0f755
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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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// met:
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//
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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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//
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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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*/
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// The following const declarations are shared with other native JS files.
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// They are all declared at this one spot to avoid const redeclaration errors.
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const $Object = global.Object;
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const $Array = global.Array;
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const $String = global.String;
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const $Number = global.Number;
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const $Function = global.Function;
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const $Boolean = global.Boolean;
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const $NaN = 0/0; |
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// ECMA-262, section 11.9.1, page 55.
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function EQUALS(y) { |
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if (IS_STRING(this) && IS_STRING(y)) return %StringEquals(this, y); |
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var x = this; |
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// NOTE: We use iteration instead of recursion, because it is
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// difficult to call EQUALS with the correct setting of 'this' in
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// an efficient way.
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while (true) { |
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if (IS_NUMBER(x)) {
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if (y == null) return 1; // not equal |
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return %NumberEquals(x, %ToNumber(y));
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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 (y == null) 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)) {
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return %_ObjectEquals(x, y) ? 0 : 1; |
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} |
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if (y == null) return 1; // not equal |
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return %NumberEquals(%ToNumber(x), %ToNumber(y));
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} else if (x == null) { |
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// NOTE: This checks for both null and undefined.
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return (y == null) ? 0 : 1; |
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} else {
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// x is not a number, boolean, null or undefined.
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if (y == null) return 1; // not equal |
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if (IS_OBJECT(y)) {
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return %_ObjectEquals(x, y) ? 0 : 1; |
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} |
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if (IS_FUNCTION(y)) {
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return %_ObjectEquals(x, y) ? 0 : 1; |
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} |
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x = %ToPrimitive(x, NO_HINT); |
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} |
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} |
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} |
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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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} |
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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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} |
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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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} |
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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 case for numbers and strings.
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if (IS_NUMBER(this) && IS_NUMBER(x)) { |
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return %NumberCompare(this, x, ncr); |
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} |
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if (IS_STRING(this) && IS_STRING(x)) { |
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return %StringCompare(this, x); |
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} |
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// Default implementation.
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var a = %ToPrimitive(this, NUMBER_HINT); |
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var b = %ToPrimitive(x, NUMBER_HINT);
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if (IS_STRING(a) && IS_STRING(b)) {
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return %StringCompare(a, b);
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} else {
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return %NumberCompare(%ToNumber(a), %ToNumber(b), ncr);
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} |
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} |
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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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*/
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// ECMA-262, section 11.6.1, page 50.
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function ADD(x) { |
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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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if (IS_STRING(a)) {
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return %StringAdd(a, %ToString(b));
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} else if (IS_STRING(b)) { |
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return %StringAdd(%ToString(a), b);
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} else {
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return %NumberAdd(%ToNumber(a), %ToNumber(b));
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} |
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} |
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// Left operand (this) is already a string.
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function STRING_ADD_LEFT(x) { |
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x = %ToString(%ToPrimitive(x, NO_HINT)); |
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return %StringAdd(this, x); |
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} |
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// Right operand (x) is already a string.
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function STRING_ADD_RIGHT(x) { |
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var a = %ToString(%ToPrimitive(this, NO_HINT)); |
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return %StringAdd(a, x);
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} |
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// ECMA-262, section 11.6.2, page 50.
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function SUB(x) { |
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return %NumberSub(%ToNumber(this), %ToNumber(x)); |
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} |
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// ECMA-262, section 11.5.1, page 48.
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function MUL(x) { |
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return %NumberMul(%ToNumber(this), %ToNumber(x)); |
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} |
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// ECMA-262, section 11.5.2, page 49.
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function DIV(x) { |
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return %NumberDiv(%ToNumber(this), %ToNumber(x)); |
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} |
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// ECMA-262, section 11.5.3, page 49.
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function MOD(x) { |
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return %NumberMod(%ToNumber(this), %ToNumber(x)); |
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} |
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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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*/
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// ECMA-262, section 11.10, page 57.
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function BIT_OR(x) { |
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return %NumberOr(%ToNumber(this), %ToNumber(x)); |
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} |
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// ECMA-262, section 11.10, page 57.
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function BIT_AND(x) { |
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return %NumberAnd(%ToNumber(this), %ToNumber(x)); |
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} |
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// ECMA-262, section 11.10, page 57.
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function BIT_XOR(x) { |
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return %NumberXor(%ToNumber(this), %ToNumber(x)); |
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} |
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// ECMA-262, section 11.4.7, page 47.
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function UNARY_MINUS() { |
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return %NumberUnaryMinus(%ToNumber(this)); |
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} |
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// ECMA-262, section 11.4.8, page 48.
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function BIT_NOT() { |
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return %NumberNot(%ToNumber(this)); |
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} |
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// ECMA-262, section 11.7.1, page 51.
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function SHL(x) { |
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return %NumberShl(%ToNumber(this), %ToNumber(x)); |
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} |
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// ECMA-262, section 11.7.2, page 51.
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function SAR(x) { |
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return %NumberSar(%ToNumber(this), %ToNumber(x)); |
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} |
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// ECMA-262, section 11.7.3, page 52.
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function SHR(x) { |
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return %NumberShr(%ToNumber(this), %ToNumber(x)); |
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} |
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/* -----------------------------
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- - - H e l p e r s - - -
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-----------------------------
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*/
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// ECMA-262, section 11.4.1, page 46.
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function DELETE(key) { |
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return %DeleteProperty(%ToObject(this), %ToString(key)); |
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} |
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// ECMA-262, section 11.8.7, page 54.
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function IN(x) { |
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if (x == null || (!IS_OBJECT(x) && !IS_FUNCTION(x))) { |
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throw %MakeTypeError('invalid_in_operator_use', [this, x]); |
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} |
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return %_IsNonNegativeSmi(this) ? %HasElement(x, this) : %HasProperty(x, %ToString(this)); |
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} |
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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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var V = this; |
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if (!IS_FUNCTION(F)) {
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throw %MakeTypeError('instanceof_function_expected', [V]); |
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} |
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// If V is not an object, return false.
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if (IS_NULL(V) || (!IS_OBJECT(V) && !IS_FUNCTION(V))) {
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return 1; |
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} |
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// Get the prototype of F; if it is not an object, throw an error.
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var O = F.prototype;
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if (IS_NULL(O) || (!IS_OBJECT(O) && !IS_FUNCTION(O))) {
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throw %MakeTypeError('instanceof_nonobject_proto', [O]); |
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} |
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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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} |
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// Get an array of property keys for the given object. Used in
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// for-in statements.
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function GET_KEYS() { |
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return %GetPropertyNames(this); |
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} |
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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 null. 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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return null; |
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} |
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function CALL_NON_FUNCTION() { |
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var callee = %GetCalledFunction();
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var delegate = %GetFunctionDelegate(callee);
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if (!IS_FUNCTION(delegate)) {
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throw %MakeTypeError('called_non_callable', [typeof callee]); |
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} |
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var parameters = %NewArguments(delegate);
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return delegate.apply(callee, parameters);
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} |
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function APPLY_PREPARE(args) { |
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var length;
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// First check whether length is a positive Smi and args is an array. This is the
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// fast case. If this fails, we do the slow case that takes care of more eventualities
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if (%_IsArray(args)) {
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length = args.length; |
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if (%_IsSmi(length) && length >= 0 && length < 0x800000 && IS_FUNCTION(this)) { |
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return length;
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} |
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} |
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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('apply_overflow', [length]); |
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} |
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if (!IS_FUNCTION(this)) { |
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throw %MakeTypeError('apply_non_function', [ %ToString(this), typeof this ]); |
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} |
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// Make sure the arguments list has the right type.
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if (args != null && |
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!%HasArrayClass(args) && |
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!%HasArgumentsClass(args)) { |
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throw %MakeTypeError('apply_wrong_args', []); |
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} |
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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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return length;
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} |
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function APPLY_OVERFLOW(length) { |
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throw %MakeRangeError('apply_overflow', [length]); |
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} |
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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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} |
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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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} |
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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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/* -------------------------------------
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- - - C o n v e r s i o n s - - -
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-------------------------------------
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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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// Fast case check.
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if (IS_STRING(x)) return x; |
400 |
// Normal behavior.
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if (!IS_OBJECT(x) && !IS_FUNCTION(x)) return x; |
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if (x == null) return x; // check for null, undefined |
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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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} |
406 |
|
407 |
|
408 |
// ECMA-262, section 9.3, page 31.
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function ToNumber(x) { |
410 |
if (IS_NUMBER(x)) return x; |
411 |
if (IS_STRING(x)) return %StringToNumber(x); |
412 |
if (IS_BOOLEAN(x)) return x ? 1 : 0; |
413 |
if (IS_UNDEFINED(x)) return $NaN; |
414 |
return (IS_NULL(x)) ? 0 : ToNumber(%DefaultNumber(x)); |
415 |
} |
416 |
|
417 |
|
418 |
// ECMA-262, section 9.8, page 35.
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function ToString(x) { |
420 |
if (IS_STRING(x)) return x; |
421 |
if (IS_NUMBER(x)) return %NumberToString(x); |
422 |
if (IS_BOOLEAN(x)) return x ? 'true' : 'false'; |
423 |
if (IS_UNDEFINED(x)) return 'undefined'; |
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return (IS_NULL(x)) ? 'null' : %ToString(%DefaultString(x)); |
425 |
} |
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|
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|
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// ... where did this come from?
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function ToBoolean(x) { |
430 |
if (IS_BOOLEAN(x)) return x; |
431 |
if (IS_STRING(x)) return x.length != 0; |
432 |
if (x == null) return false; |
433 |
if (IS_NUMBER(x)) return !((x == 0) || NUMBER_IS_NAN(x)); |
434 |
return true; |
435 |
} |
436 |
|
437 |
|
438 |
// ECMA-262, section 9.9, page 36.
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function ToObject(x) { |
440 |
if (IS_STRING(x)) return new $String(x); |
441 |
if (IS_NUMBER(x)) return new $Number(x); |
442 |
if (IS_BOOLEAN(x)) return new $Boolean(x); |
443 |
if (x == null) throw %MakeTypeError('null_to_object', []); |
444 |
return x;
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445 |
} |
446 |
|
447 |
|
448 |
// ECMA-262, section 9.4, page 34.
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449 |
function ToInteger(x) { |
450 |
if (%_IsSmi(x)) return x; |
451 |
return %NumberToInteger(ToNumber(x));
|
452 |
} |
453 |
|
454 |
|
455 |
// ECMA-262, section 9.6, page 34.
|
456 |
function ToUint32(x) { |
457 |
if (%_IsSmi(x) && x >= 0) return x; |
458 |
return %NumberToJSUint32(ToNumber(x));
|
459 |
} |
460 |
|
461 |
|
462 |
// ECMA-262, section 9.5, page 34
|
463 |
function ToInt32(x) { |
464 |
if (%_IsSmi(x)) return x; |
465 |
return %NumberToJSInt32(ToNumber(x));
|
466 |
} |
467 |
|
468 |
|
469 |
|
470 |
/* ---------------------------------
|
471 |
- - - U t i l i t i e s - - -
|
472 |
---------------------------------
|
473 |
*/
|
474 |
|
475 |
// Returns if the given x is a primitive value - not an object or a
|
476 |
// function.
|
477 |
function IsPrimitive(x) { |
478 |
if (!IS_OBJECT(x) && !IS_FUNCTION(x)) {
|
479 |
return true; |
480 |
} else {
|
481 |
// Even though the type of null is "object", null is still
|
482 |
// considered a primitive value.
|
483 |
return IS_NULL(x);
|
484 |
} |
485 |
} |
486 |
|
487 |
|
488 |
// ECMA-262, section 8.6.2.6, page 28.
|
489 |
function DefaultNumber(x) { |
490 |
if (IS_FUNCTION(x.valueOf)) {
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491 |
var v = x.valueOf();
|
492 |
if (%IsPrimitive(v)) return v; |
493 |
} |
494 |
|
495 |
if (IS_FUNCTION(x.toString)) {
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496 |
var s = x.toString();
|
497 |
if (%IsPrimitive(s)) return s; |
498 |
} |
499 |
|
500 |
throw %MakeTypeError('cannot_convert_to_primitive', []); |
501 |
} |
502 |
|
503 |
|
504 |
// ECMA-262, section 8.6.2.6, page 28.
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505 |
function DefaultString(x) { |
506 |
if (IS_FUNCTION(x.toString)) {
|
507 |
var s = x.toString();
|
508 |
if (%IsPrimitive(s)) return s; |
509 |
} |
510 |
|
511 |
if (IS_FUNCTION(x.valueOf)) {
|
512 |
var v = x.valueOf();
|
513 |
if (%IsPrimitive(v)) return v; |
514 |
} |
515 |
|
516 |
throw %MakeTypeError('cannot_convert_to_primitive', []); |
517 |
} |
518 |
|
519 |
|
520 |
// NOTE: Setting the prototype for Array must take place as early as
|
521 |
// possible due to code generation for array literals. When
|
522 |
// generating code for a array literal a boilerplate array is created
|
523 |
// that is cloned when running the code. It is essiential that the
|
524 |
// boilerplate gets the right prototype.
|
525 |
%FunctionSetPrototype($Array, new $Array(0)); |