Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/interpreter/BytecodeTableswitch.java @ 19491:4d66c000d253
Truffle/Instrumentation: more cleanup in Probe
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
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date | Wed, 18 Feb 2015 18:30:49 -0800 |
parents | c18cbe5936b8 |
children |
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/* * Copyright (c) 2001, 2003, 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 * or visit www.oracle.com if you need additional information or have any * questions. * */ package sun.jvm.hotspot.interpreter; import sun.jvm.hotspot.oops.*; import sun.jvm.hotspot.utilities.*; public class BytecodeTableswitch extends Bytecode { BytecodeTableswitch(Method method, int bci) { super(method, bci); } // Attributes public int defaultOffset() { return javaSignedWordAt(alignedOffset(1 + 0*jintSize)); } public int lowKey() { return javaSignedWordAt(alignedOffset(1 + 1*jintSize)); } public int highKey() { return javaSignedWordAt(alignedOffset(1 + 2*jintSize)); } public int length() { return highKey()-lowKey()+1; } public int destOffsetAt(int i) { int x2 = alignedOffset(1 + (3 + i)*jintSize); int val = javaSignedWordAt(x2); return javaSignedWordAt(alignedOffset(1 + (3 + i)*jintSize)); } public void verify() { if (Assert.ASSERTS_ENABLED) { Assert.that(isValid(), "check tableswitch"); } } public boolean isValid() { boolean result = javaCode() == Bytecodes._tableswitch; if (result == false) return false; int lo = lowKey(); int hi = highKey(); if (hi < lo) // incorrect hi/lo values in tableswitch return false; int i = hi - lo - 1 ; while (i-- > 0) { // no special check needed } return true; } public static BytecodeTableswitch at(Method method, int bci) { BytecodeTableswitch b = new BytecodeTableswitch(method, bci); if (Assert.ASSERTS_ENABLED) { b.verify(); } return b; } /** Like at, but returns null if the BCI is not at tableswitch */ public static BytecodeTableswitch atCheck(Method method, int bci) { BytecodeTableswitch b = new BytecodeTableswitch(method, bci); return (b.isValid() ? b : null); } public static BytecodeTableswitch at(BytecodeStream bcs) { return new BytecodeTableswitch(bcs.method(), bcs.bci()); } public String toString() { StringBuffer buf = new StringBuffer(); buf.append("tableswitch"); buf.append(spaces); buf.append("default: "); buf.append(Integer.toString(bci() + defaultOffset())); buf.append(comma); int lo = lowKey(); int hi = highKey(); int i = hi - lo - 1 ; while (i-- > 0) { buf.append("case "); buf.append(Integer.toString(lo + i)); buf.append(':'); buf.append(Integer.toString(bci() + destOffsetAt(i))); buf.append(comma); } return buf.toString(); } }