1 /* 2 * Copyright (c) 2001, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 package sun.jvm.hotspot.interpreter; 26 27 import java.util.*; 28 import sun.jvm.hotspot.oops.*; 29 import sun.jvm.hotspot.utilities.*; 30 31 class OopMapForCacheEntry extends GenerateOopMap { 32 private OopMapCacheEntry entry; 33 private int bci; 34 private int stackTop; 35 OopMapForCacheEntry(Method method, int bci, OopMapCacheEntry entry)36 OopMapForCacheEntry(Method method, int bci, OopMapCacheEntry entry) { 37 super(method); 38 this.entry = entry; 39 this.bci = bci; 40 this.stackTop = -1; 41 } 42 reportResults()43 public boolean reportResults() { return false; } 44 possibleGCPoint(BytecodeStream bcs)45 public boolean possibleGCPoint(BytecodeStream bcs) { 46 return false; // We are not reporting any result. We call resultForBasicblock directly 47 } 48 fillStackmapProlog(int nof_gc_points)49 public void fillStackmapProlog(int nof_gc_points) { 50 // Do nothing 51 } 52 fillStackmapEpilog()53 public void fillStackmapEpilog() { 54 // Do nothing 55 } 56 fillStackmapForOpcodes(BytecodeStream bcs, CellTypeStateList vars, CellTypeStateList stack, int stackTop)57 public void fillStackmapForOpcodes(BytecodeStream bcs, 58 CellTypeStateList vars, 59 CellTypeStateList stack, 60 int stackTop) { 61 // Only interested in one specific bci 62 if (bcs.bci() == bci) { 63 entry.setMask(vars, stack, stackTop); 64 this.stackTop = stackTop; 65 } 66 } 67 fillInitVars(List initVars)68 public void fillInitVars(List/*<Integer>*/ initVars) { 69 // Do nothing 70 } 71 computeMap()72 public void computeMap() { 73 if (Assert.ASSERTS_ENABLED) { 74 Assert.that(!method().isNative(), "cannot compute oop map for native methods"); 75 } 76 // First check if it is a method where the stackmap is always empty 77 if (method().getCodeSize() == 0 || method().getMaxLocals() + method().getMaxStack() == 0) { 78 entry.setEmptyMask(); 79 } else { 80 super.computeMap(); 81 resultForBasicblock(bci); 82 } 83 } 84 size()85 public int size() { 86 if (Assert.ASSERTS_ENABLED) { 87 Assert.that(stackTop != -1, "computeMap must be called first"); 88 } 89 return (int) ((method().isStatic() ? 0 : 1) + method().getMaxLocals() + stackTop); 90 } 91 } 92