| /* |
| * Copyright (c) 2000, 2004, 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.runtime; |
| |
| import sun.jvm.hotspot.utilities.*; |
| |
| /** <P> StackFrameStream iterates through the frames of a thread |
| starting from top most frame. It automatically takes care of |
| updating the location of all (callee-saved) registers. Notice: If |
| a thread is stopped at a safepoint, all registers are saved, not |
| only the callee-saved ones. </P> |
| |
| <P> Use: </P> |
| |
| <PRE> |
| for(StackFrameStream fst = new StackFrameStream(thread); !fst.isDone(); fst.next()) { |
| ... |
| } |
| </PRE> |
| */ |
| |
| public class StackFrameStream { |
| private Frame fr; |
| private RegisterMap regMap; |
| private boolean isDone; |
| |
| /** Equivalent to StackFrameStream(thread, true) */ |
| public StackFrameStream(JavaThread thread) { |
| this(thread, true); |
| } |
| |
| public StackFrameStream(JavaThread thread, boolean update) { |
| if (!VM.getVM().isDebugging()) { |
| if (Assert.ASSERTS_ENABLED) { |
| Assert.that(thread.hasLastJavaFrame(), "sanity check"); |
| } |
| fr = thread.getLastFrame(); |
| regMap = thread.newRegisterMap(update); |
| isDone = false; |
| } else { |
| // Special case code to find the topmost Java frame |
| // FIXME: should check to see whether we're at safepoint, and if |
| // so, skip the "current frame guess" call and unnecessary |
| // stackwalking work |
| fr = thread.getCurrentFrameGuess(); |
| regMap = thread.newRegisterMap(update); |
| while ((fr != null) && (!fr.isJavaFrame())) { |
| if (fr.isFirstFrame()) { |
| fr = null; |
| } else { |
| fr = fr.sender(regMap); |
| } |
| } |
| if (fr == null) { |
| isDone = true; |
| } |
| } |
| } |
| |
| /** Iteration */ |
| public boolean isDone() { |
| if (isDone) { |
| return true; |
| } else { |
| if (fr == null) { |
| isDone = true; |
| return true; |
| } |
| isDone = fr.isFirstFrame(); |
| return false; |
| } |
| } |
| |
| public void next() { |
| if (!isDone) { |
| fr = fr.sender(regMap); |
| } |
| } |
| |
| /** Query */ |
| public Frame getCurrent() { return fr; } |
| public RegisterMap getRegisterMap() { return regMap; } |
| } |