6939203: JSR 292 needs method handle constants
Summary: Add new CP types CONSTANT_MethodHandle, CONSTANT_MethodType; extend 'ldc' bytecode.
Reviewed-by: twisti, never
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package sun.jvm.hotspot.oops;
import java.io.*;
import java.util.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.types.*;
import sun.jvm.hotspot.utilities.*;
// ConstantPoolCache : A constant pool cache (constantPoolCacheOopDesc).
// See cpCacheOop.hpp for details about this class.
//
public class ConstantPoolCache extends Oop {
static {
VM.registerVMInitializedObserver(new Observer() {
public void update(Observable o, Object data) {
initialize(VM.getVM().getTypeDataBase());
}
});
}
private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
Type type = db.lookupType("constantPoolCacheOopDesc");
constants = new OopField(type.getOopField("_constant_pool"), 0);
baseOffset = type.getSize();
Type elType = db.lookupType("ConstantPoolCacheEntry");
elementSize = elType.getSize();
length = new CIntField(type.getCIntegerField("_length"), 0);
}
ConstantPoolCache(OopHandle handle, ObjectHeap heap) {
super(handle, heap);
}
public boolean isConstantPoolCache() { return true; }
private static OopField constants;
private static long baseOffset;
private static long elementSize;
private static CIntField length;
public ConstantPool getConstants() { return (ConstantPool) constants.getValue(this); }
public long getObjectSize() {
return alignObjectSize(baseOffset + getLength() * elementSize);
}
public ConstantPoolCacheEntry getEntryAt(int i) {
if (Assert.ASSERTS_ENABLED) {
Assert.that(0 <= i && i < getLength(), "index out of bounds");
}
return new ConstantPoolCacheEntry(this, i);
}
public static boolean isSecondaryIndex(int i) { return (i < 0); }
public static int decodeSecondaryIndex(int i) { return isSecondaryIndex(i) ? ~i : i; }
public static int encodeSecondaryIndex(int i) { return !isSecondaryIndex(i) ? ~i : i; }
// secondary entries hold invokedynamic call site bindings
public ConstantPoolCacheEntry getSecondaryEntryAt(int i) {
ConstantPoolCacheEntry e = new ConstantPoolCacheEntry(this, decodeSecondaryIndex(i));
if (Assert.ASSERTS_ENABLED) {
Assert.that(e.isSecondaryEntry(), "must be a secondary entry");
}
return e;
}
public ConstantPoolCacheEntry getMainEntryAt(int i) {
if (isSecondaryIndex(i)) {
// run through an extra level of indirection:
i = getSecondaryEntryAt(i).getMainEntryIndex();
}
ConstantPoolCacheEntry e = new ConstantPoolCacheEntry(this, i);
if (Assert.ASSERTS_ENABLED) {
Assert.that(!e.isSecondaryEntry(), "must not be a secondary entry");
}
return e;
}
public int getIntAt(int entry, int fld) {
//alignObjectSize ?
long offset = baseOffset + /*alignObjectSize*/entry * elementSize + fld* getHeap().getIntSize();
return (int) getHandle().getCIntegerAt(offset, getHeap().getIntSize(), true );
}
public void printValueOn(PrintStream tty) {
tty.print("ConstantPoolCache for " + getConstants().getPoolHolder().getName().asString());
}
public int getLength() {
return (int) length.getValue(this);
}
public void iterateFields(OopVisitor visitor, boolean doVMFields) {
super.iterateFields(visitor, doVMFields);
if (doVMFields) {
visitor.doOop(constants, true);
for (int i = 0; i < getLength(); i++) {
ConstantPoolCacheEntry entry = getEntryAt(i);
entry.iterateFields(visitor);
}
}
}
};