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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.
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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 CharSequence))
return wrapDouble(toNumber(val1) + val2);
return new ConsString((CharSequence)val1, toString(val2));
}
public static Object add(double val1, Object val2)
{
if (val2 instanceof Scriptable)
val2 = ((Scriptable) val2).getDefaultValue(null);
if (!(val2 instanceof CharSequence))
return wrapDouble(toNumber(val2) + val1);
return new ConsString(toString(val1), (CharSequence)val2);
}
/**
* @deprecated Use {@link #elemIncrDecr(Object, double, Context, Scriptable, int)} instead
*/
@Deprecated
public static Object elemIncrDecr(Object obj, double index,
Context cx, int incrDecrMask)
{
return elemIncrDecr(obj, index, cx, getTopCallScope(cx), incrDecrMask);
}
public static Object elemIncrDecr(Object obj, double index,
Context cx, Scriptable scope,
int incrDecrMask)
{
return ScriptRuntime.elemIncrDecr(obj, new Double(index), cx, scope,
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 Function bindThis(NativeFunction fn, Context cx, Scriptable scope, Scriptable thisObj)
{
return new ArrowFunction(cx, scope, fn, thisObj);
}
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;
}
}
}
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