Mercurial > hg > truffle
view graal/com.oracle.max.cri/src/com/oracle/max/cri/ci/CiFrame.java @ 5151:5717fc2be01c
Merge
author | Christian Haeubl <christian.haeubl@oracle.com> |
---|---|
date | Thu, 22 Mar 2012 19:06:04 -0700 |
parents | 51111665eda6 |
children | 2fac5abf145f |
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/* * Copyright (c) 2009, 2012, 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.oracle.max.cri.ci; import java.io.*; import com.oracle.max.cri.ri.*; /** * Represents the Java bytecode frame state(s) at a given position * including {@link CiValue locations} where to find the local variables, * operand stack values and locked objects of the bytecode frame(s). */ public class CiFrame extends CiCodePos implements Serializable { private static final long serialVersionUID = -345025397165977565L; /** * An array of values representing how to reconstruct the state of the Java frame. * This is array is partitioned as follows: * <p> * <table border="1" cellpadding="5" frame="void", rules="all"> * <tr><th>Start index (inclusive)</th><th>End index (exclusive)</th><th>Description</th></tr> * <tr><td>0</td> <td>numLocals</td> <td>Local variables</td></tr> * <tr><td>numLocals</td> <td>numLocals + numStack</td><td>Operand stack</td></tr> * <tr><td>numLocals + numStack</td><td>values.length</td> <td>Locked objects</td></tr> * </table> * <p> * Note that the number of locals and the number of stack slots may be smaller than the * maximum number of locals and stack slots as specified in the compiled method. */ public final CiValue[] values; /** * The number of locals in the values array. */ public final int numLocals; /** * The number of stack slots in the values array. */ public final int numStack; /** * The number of locks in the values array. */ public final int numLocks; public final long leafGraphId; public final boolean rethrowException; public final boolean duringCall; /** * Creates a new frame object. * * @param caller the caller frame (which may be {@code null}) * @param method the method * @param bci a BCI within the method * @param rethrowException specifies if the VM should re-throw the pending exception when deopt'ing using this frame * @param values the frame state {@link #values} * @param numLocals the number of local variables * @param numStack the depth of the stack * @param numLocks the number of locked objects */ public CiFrame(CiFrame caller, RiResolvedMethod method, int bci, boolean rethrowException, boolean duringCall, CiValue[] values, int numLocals, int numStack, int numLocks, long leafGraphId) { super(caller, method, bci); assert values != null; this.rethrowException = rethrowException; this.duringCall = duringCall; this.values = values; this.numLocals = numLocals; this.numStack = numStack; this.numLocks = numLocks; this.leafGraphId = leafGraphId; assert !rethrowException || numStack == 1 : "must have exception on top of the stack"; } /** * Gets the value representing the specified local variable. * @param i the local variable index * @return the value that can be used to reconstruct the local's current value */ public CiValue getLocalValue(int i) { return values[i]; } /** * Gets the value representing the specified stack slot. * @param i the stack index * @return the value that can be used to reconstruct the stack slot's current value */ public CiValue getStackValue(int i) { return values[i + numLocals]; } /** * Gets the value representing the specified lock. * @param i the lock index * @return the value that can be used to reconstruct the lock's current value */ public CiValue getLockValue(int i) { return values[i + numLocals + numStack]; } /** * Gets the caller of this frame. * * @return {@code null} if this frame has no caller */ public CiFrame caller() { return (CiFrame) caller; } @Override public String toString() { return CiUtil.append(new StringBuilder(100), this).toString(); } }