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view agent/src/share/classes/sun/jvm/hotspot/interpreter/OopMapForCacheEntry.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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/* * Copyright 2001 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ 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 { super.computeMap(); resultForBasicblock(bci); } } public int size() { if (Assert.ASSERTS_ENABLED) { Assert.that(stackTop != -1, "computeMap must be called first"); } return (int) ((method().isStatic() ? 0 : 1) + method().getMaxLocals() + stackTop); } }