Mercurial > hg > graal-jvmci-8
diff graal/com.oracle.max.cri/src/com/sun/cri/ci/CiCodePos.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
parents | |
children | bc8527f3071c |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.max.cri/src/com/sun/cri/ci/CiCodePos.java Sat Dec 17 19:59:18 2011 +0100 @@ -0,0 +1,100 @@ +/* + * Copyright (c) 2009, 2011, 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 com.sun.cri.ci; + +import java.io.*; + +import com.sun.cri.ri.*; + +/** + * Represents a code position, that is, a chain of inlined methods with bytecode + * locations, that is communicated from the compiler to the runtime system. A code position + * can be used by the runtime system to reconstruct a source-level stack trace + * for exceptions and to create {@linkplain CiFrame frames} for deoptimization. + */ +public class CiCodePos implements Serializable { + /** + * The position where this position has been called, {@code null} if none. + */ + public final CiCodePos caller; + + /** + * The runtime interface method for this position. + */ + public final RiResolvedMethod method; + + /** + * The location within the method, as a bytecode index. The constant + * {@code -1} may be used to indicate the location is unknown, for example + * within code synthesized by the compiler. + */ + public final int bci; + + /** + * Constructs a new object representing a given parent/caller, a given method, and a given BCI. + * + * @param caller the parent position + * @param method the method + * @param bci a BCI within the method + */ + public CiCodePos(CiCodePos caller, RiResolvedMethod method, int bci) { + assert method != null; + this.caller = caller; + this.method = method; + this.bci = bci; + } + + /** + * Converts this code position to a string representation. + * @return a string representation of this code position + */ + @Override + public String toString() { + return CiUtil.append(new StringBuilder(100), this).toString(); + } + + /** + * Deep equality test. + */ + @Override + public boolean equals(Object obj) { + if (obj == this) { + return true; + } + if (obj instanceof CiCodePos) { + CiCodePos other = (CiCodePos) obj; + if (other.method.equals(method) && other.bci == bci) { + if (caller == null) { + return other.caller == null; + } + return caller.equals(other.caller); + } + } + return false; + } + + @Override + public int hashCode() { + return bci; + } +}