Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/interpreter/BytecodeIf.java @ 271:818a18cd69a8
6730514: assertion failure in mangling code when expanding by 0 bytes
Summary: An expansion by 0 bytes was not anticipated when the assertion was composed.
Reviewed-by: jjh, jcoomes, apetrusenko
author | jmasa |
---|---|
date | Wed, 30 Jul 2008 11:54:00 -0700 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
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/* * Copyright 2002 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 sun.jvm.hotspot.oops.*; import sun.jvm.hotspot.utilities.*; public class BytecodeIf extends BytecodeJmp { BytecodeIf(Method method, int bci) { super(method, bci); } public int getTargetBCI() { return bci() + javaShortAt(1); } public void verify() { if (Assert.ASSERTS_ENABLED) { Assert.that(isValid(), "check if"); } } public boolean isValid() { int jcode = javaCode(); return (jcode >= Bytecodes._ifeq && jcode <= Bytecodes._if_acmpne) || jcode == Bytecodes._ifnull || jcode == Bytecodes._ifnonnull; } public static BytecodeIf at(Method method, int bci) { BytecodeIf b = new BytecodeIf(method, bci); if (Assert.ASSERTS_ENABLED) { b.verify(); } return b; } /** Like at, but returns null if the BCI is not at some ifxxx bytecode */ public static BytecodeIf atCheck(Method method, int bci) { BytecodeIf b = new BytecodeIf(method, bci); return (b.isValid() ? b : null); } public static BytecodeIf at(BytecodeStream bcs) { return new BytecodeIf(bcs.method(), bcs.bci()); } }