org.mozilla.javascript.optimizer.OptRuntime Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of js Show documentation
Show all versions of js Show documentation
Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.
The newest version!
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Rhino code, released
* May 6, 1999.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1997-2000
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Norris Boyd
* Roger Lawrence
* Hannes Wallnoefer
*
* Alternatively, the contents of this file may be used under the terms of
* the GNU General Public License Version 2 or later (the "GPL"), in which
* case the provisions of the GPL are applicable instead of those above. If
* you wish to allow use of your version of this file only under the terms of
* the GPL and not to allow others to use your version of this file under the
* MPL, indicate your decision by deleting the provisions above and replacing
* them with the notice and other provisions required by the GPL. If you do
* not delete the provisions above, a recipient may use your version of this
* file under either the MPL or the GPL.
*
* ***** END LICENSE BLOCK ***** */
package org.mozilla.javascript.optimizer;
import org.mozilla.javascript.*;
public final class OptRuntime extends ScriptRuntime
{
public static final Double zeroObj = new Double(0.0);
public static final Double oneObj = new Double(1.0);
public static final Double minusOneObj = new Double(-1.0);
/**
* Implement ....() call shrinking optimizer code.
*/
public static Object call0(Callable fun, Scriptable thisObj,
Context cx, Scriptable scope)
{
return fun.call(cx, scope, thisObj, ScriptRuntime.emptyArgs);
}
/**
* Implement ....(arg) call shrinking optimizer code.
*/
public static Object call1(Callable fun, Scriptable thisObj, Object arg0,
Context cx, Scriptable scope)
{
return fun.call(cx, scope, thisObj, new Object[] { arg0 } );
}
/**
* Implement ....(arg0, arg1) call shrinking optimizer code.
*/
public static Object call2(Callable fun, Scriptable thisObj,
Object arg0, Object arg1,
Context cx, Scriptable scope)
{
return fun.call(cx, scope, thisObj, new Object[] { arg0, arg1 });
}
/**
* Implement ....(arg0, arg1, ...) call shrinking optimizer code.
*/
public static Object callN(Callable fun, Scriptable thisObj,
Object[] args,
Context cx, Scriptable scope)
{
return fun.call(cx, scope, thisObj, args);
}
/**
* Implement name(args) call shrinking optimizer code.
*/
public static Object callName(Object[] args, String name,
Context cx, Scriptable scope)
{
Callable f = getNameFunctionAndThis(name, cx, scope);
Scriptable thisObj = lastStoredScriptable(cx);
return f.call(cx, scope, thisObj, args);
}
/**
* Implement name() call shrinking optimizer code.
*/
public static Object callName0(String name,
Context cx, Scriptable scope)
{
Callable f = getNameFunctionAndThis(name, cx, scope);
Scriptable thisObj = lastStoredScriptable(cx);
return f.call(cx, scope, thisObj, ScriptRuntime.emptyArgs);
}
/**
* Implement x.property() call shrinking optimizer code.
*/
public static Object callProp0(Object value, String property,
Context cx, Scriptable scope)
{
Callable f = getPropFunctionAndThis(value, property, cx, scope);
Scriptable thisObj = lastStoredScriptable(cx);
return f.call(cx, scope, thisObj, ScriptRuntime.emptyArgs);
}
public static Object add(Object val1, double val2)
{
if (val1 instanceof Scriptable)
val1 = ((Scriptable) val1).getDefaultValue(null);
if (!(val1 instanceof String))
return wrapDouble(toNumber(val1) + val2);
return ((String)val1).concat(toString(val2));
}
public static Object add(double val1, Object val2)
{
if (val2 instanceof Scriptable)
val2 = ((Scriptable) val2).getDefaultValue(null);
if (!(val2 instanceof String))
return wrapDouble(toNumber(val2) + val1);
return toString(val1).concat((String)val2);
}
public static Object elemIncrDecr(Object obj, double index,
Context cx, int incrDecrMask)
{
return ScriptRuntime.elemIncrDecr(obj, new Double(index), cx,
incrDecrMask);
}
public static Object[] padStart(Object[] currentArgs, int count) {
Object[] result = new Object[currentArgs.length + count];
System.arraycopy(currentArgs, 0, result, count, currentArgs.length);
return result;
}
public static void initFunction(NativeFunction fn, int functionType,
Scriptable scope, Context cx)
{
ScriptRuntime.initFunction(cx, scope, fn, functionType, false);
}
public static Object callSpecial(Context cx, Callable fun,
Scriptable thisObj, Object[] args,
Scriptable scope,
Scriptable callerThis, int callType,
String fileName, int lineNumber)
{
return ScriptRuntime.callSpecial(cx, fun, thisObj, args, scope,
callerThis, callType,
fileName, lineNumber);
}
public static Object newObjectSpecial(Context cx, Object fun,
Object[] args, Scriptable scope,
Scriptable callerThis, int callType)
{
return ScriptRuntime.newSpecial(cx, fun, args, scope, callType);
}
public static Double wrapDouble(double num)
{
if (num == 0.0) {
if (1 / num > 0) {
// +0.0
return zeroObj;
}
} else if (num == 1.0) {
return oneObj;
} else if (num == -1.0) {
return minusOneObj;
} else if (num != num) {
return NaNobj;
}
return new Double(num);
}
static String encodeIntArray(int[] array)
{
// XXX: this extremely inefficient for small integers
if (array == null) { return null; }
int n = array.length;
char[] buffer = new char[1 + n * 2];
buffer[0] = 1;
for (int i = 0; i != n; ++i) {
int value = array[i];
int shift = 1 + i * 2;
buffer[shift] = (char)(value >>> 16);
buffer[shift + 1] = (char)value;
}
return new String(buffer);
}
private static int[] decodeIntArray(String str, int arraySize)
{
// XXX: this extremely inefficient for small integers
if (arraySize == 0) {
if (str != null) throw new IllegalArgumentException();
return null;
}
if (str.length() != 1 + arraySize * 2 && str.charAt(0) != 1) {
throw new IllegalArgumentException();
}
int[] array = new int[arraySize];
for (int i = 0; i != arraySize; ++i) {
int shift = 1 + i * 2;
array[i] = (str.charAt(shift) << 16) | str.charAt(shift + 1);
}
return array;
}
public static Scriptable newArrayLiteral(Object[] objects,
String encodedInts,
int skipCount,
Context cx,
Scriptable scope)
{
int[] skipIndexces = decodeIntArray(encodedInts, skipCount);
return newArrayLiteral(objects, skipIndexces, cx, scope);
}
public static void main(final Script script, final String[] args)
{
ContextFactory.getGlobal().call(new ContextAction() {
public Object run(Context cx)
{
ScriptableObject global = getGlobal(cx);
// get the command line arguments and define "arguments"
// array in the top-level object
Object[] argsCopy = new Object[args.length];
System.arraycopy(args, 0, argsCopy, 0, args.length);
Scriptable argsObj = cx.newArray(global, argsCopy);
global.defineProperty("arguments", argsObj,
ScriptableObject.DONTENUM);
script.exec(cx, global);
return null;
}
});
}
public static void throwStopIteration(Object obj) {
throw new JavaScriptException(
NativeIterator.getStopIterationObject((Scriptable)obj), "", 0);
}
public static Scriptable createNativeGenerator(NativeFunction funObj,
Scriptable scope,
Scriptable thisObj,
int maxLocals,
int maxStack)
{
return new NativeGenerator(scope, funObj,
new GeneratorState(thisObj, maxLocals, maxStack));
}
public static Object[] getGeneratorStackState(Object obj) {
GeneratorState rgs = (GeneratorState) obj;
if (rgs.stackState == null)
rgs.stackState = new Object[rgs.maxStack];
return rgs.stackState;
}
public static Object[] getGeneratorLocalsState(Object obj) {
GeneratorState rgs = (GeneratorState) obj;
if (rgs.localsState == null)
rgs.localsState = new Object[rgs.maxLocals];
return rgs.localsState;
}
public static class GeneratorState {
static final String CLASS_NAME =
"org/mozilla/javascript/optimizer/OptRuntime$GeneratorState";
public int resumptionPoint;
static final String resumptionPoint_NAME = "resumptionPoint";
static final String resumptionPoint_TYPE = "I";
public Scriptable thisObj;
static final String thisObj_NAME = "thisObj";
static final String thisObj_TYPE =
"Lorg/mozilla/javascript/Scriptable;";
Object[] stackState;
Object[] localsState;
int maxLocals;
int maxStack;
GeneratorState(Scriptable thisObj, int maxLocals, int maxStack) {
this.thisObj = thisObj;
this.maxLocals = maxLocals;
this.maxStack = maxStack;
}
}
}