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package com.oracle.truffle.js.runtime.util;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.api.nodes.NodeCloneable;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.js.runtime.Boundaries;
import com.oracle.truffle.js.runtime.builtins.JSClass;
import com.oracle.truffle.js.runtime.objects.JSShape;
public abstract class JSClassProfile extends NodeCloneable {
JSClassProfile() {
}
public static JSClassProfile create() {
return new JSClassProfile.Cached();
}
public static JSClassProfile getUncached() {
return UNCACHED;
}
public JSClass getJSClass(DynamicObject jsobject) {
return (JSClass) JSShape.getJSClassNoCast(jsobject.getShape());
}
public JSClass profile(JSClass jsobjectClass) {
return jsobjectClass;
}
private static final class Cached extends JSClassProfile {
@CompilationFinal private JSClass expectedJSClass;
@CompilationFinal private boolean polymorphicJSClass;
@Override
public JSClass getJSClass(DynamicObject jsobject) {
Object jsobjectClass = JSShape.getJSClassNoCast(jsobject.getShape());
if (!polymorphicJSClass) {
if (jsobjectClass == expectedJSClass) {
return expectedJSClass;
} else {
CompilerDirectives.transferToInterpreterAndInvalidate();
if (expectedJSClass == null) {
expectedJSClass = (JSClass) jsobjectClass;
} else {
polymorphicJSClass = true;
}
}
}
return (JSClass) jsobjectClass;
}
@Override
public JSClass profile(JSClass jsobjectClass) {
if (!polymorphicJSClass) {
if (jsobjectClass == expectedJSClass) {
return expectedJSClass;
} else {
CompilerDirectives.transferToInterpreterAndInvalidate();
if (expectedJSClass == null) {
expectedJSClass = jsobjectClass;
} else {
polymorphicJSClass = true;
}
}
}
return jsobjectClass;
}
@Override
public String toString() {
return "JSClass(" + (polymorphicJSClass ? "polymorphic" : Boundaries.stringValueOf(expectedJSClass)) + ")";
}
}
private static final JSClassProfile UNCACHED = new JSClassProfile() {
@Override
public String toString() {
return "JSClass(uncached)";
}
};
}