Mercurial > hg > graal-jvmci-8
view jvmci/jdk.vm.ci.code/src/jdk/vm/ci/code/BytecodePosition.java @ 23398:3e8ce13f4e12
minimize diff to jvmci-9
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 17 May 2016 21:10:34 +0200 |
parents | 1bbd4a7c274b |
children | d64936a16a13 |
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/* * 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 jdk.vm.ci.code; import java.util.Objects; import jdk.vm.ci.meta.ResolvedJavaMethod; /** * 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 BytecodeFrame frames} for deoptimization. */ public class BytecodePosition { private final BytecodePosition caller; private final ResolvedJavaMethod method; private 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 BytecodePosition(BytecodePosition caller, ResolvedJavaMethod 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 CodeUtil.append(new StringBuilder(100), this).toString(); } /** * Deep equality test. */ @Override public boolean equals(Object obj) { if (obj == this) { return true; } if (obj != null && getClass() == obj.getClass()) { BytecodePosition that = (BytecodePosition) obj; if (this.bci == that.bci && Objects.equals(this.getMethod(), that.getMethod()) && Objects.equals(this.caller, that.caller)) { return true; } } return false; } @Override public int hashCode() { return getBCI(); } /** * @return 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 int getBCI() { return bci; } /** * @return The runtime interface method for this position. */ public ResolvedJavaMethod getMethod() { return method; } /** * The position where this position has been called, {@code null} if none. */ public BytecodePosition getCaller() { return caller; } /** * Adds a caller to the current position returning the new position. */ public BytecodePosition addCaller(BytecodePosition link) { if (getCaller() == null) { return new BytecodePosition(link, getMethod(), getBCI()); } else { return new BytecodePosition(getCaller().addCaller(link), getMethod(), getBCI()); } } }