/*
* Copyright (c) 2001, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* questions.
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*/
package sun.jvm.hotspot.interpreter;
import java.util.*;
import sun.jvm.hotspot.oops.*;
import sun.jvm.hotspot.utilities.*;
class OopMapForCacheEntry extends GenerateOopMap {
private OopMapCacheEntry entry;
private int bci;
private int stackTop;
OopMapForCacheEntry(Method method, int bci, OopMapCacheEntry entry) {
super(method);
this.entry = entry;
this.bci = bci;
this.stackTop = -1;
}
public boolean reportResults() { return false; }
public boolean possibleGCPoint(BytecodeStream bcs) {
return false; // We are not reporting any result. We call resultForBasicblock directly
}
public void fillStackmapProlog(int nof_gc_points) {
// Do nothing
}
public void fillStackmapEpilog() {
// Do nothing
}
public void fillStackmapForOpcodes(BytecodeStream bcs,
CellTypeStateList vars,
CellTypeStateList stack,
int stackTop) {
// Only interested in one specific bci
if (bcs.bci() == bci) {
entry.setMask(vars, stack, stackTop);
this.stackTop = stackTop;
}
}
public void fillInitVars(List/*<Integer>*/ initVars) {
// Do nothing
}
public void computeMap() {
if (Assert.ASSERTS_ENABLED) {
Assert.that(!method().isNative(), "cannot compute oop map for native methods");
}
// First check if it is a method where the stackmap is always empty
if (method().getCodeSize() == 0 || method().getMaxLocals() + method().getMaxStack() == 0) {
entry.setEmptyMask();
} else {
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