Mercurial > hg > truffle
diff agent/src/share/classes/sun/jvm/hotspot/interpreter/OopMapForCacheEntry.java @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/agent/src/share/classes/sun/jvm/hotspot/interpreter/OopMapForCacheEntry.java Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,91 @@ +/* + * 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); + } +}