diff -r 4ebc2e2fb97c -r 71c04702a3d5 src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/runtime/VFrame.java --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/runtime/VFrame.java Tue Sep 12 19:03:39 2017 +0200 @@ -0,0 +1,206 @@ +/* + * Copyright (c) 2000, 2006, 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 java.io.*; +import sun.jvm.hotspot.code.*; +import sun.jvm.hotspot.utilities.*; + +public class VFrame { + protected Frame fr; + protected RegisterMap regMap; + protected JavaThread thread; + + protected VFrame(Frame f, RegisterMap regMap, JavaThread thread) { + this.regMap = (RegisterMap) regMap.clone(); + + if (f != null) { + // the frame is null if we create a deoptimizedVFrame from a vframeArray + fr = (Frame) f.clone(); + } + + this.thread = thread; + } + + /** Factory method for creating vframes. The "unsafe" flag turns off + an assertion which the runtime system uses to ensure integrity, + but which must not be applied in the debugging situation. The + "mayBeImprecise" flag should be set to true for the case of the + top frame in the debugging system (obtained via + JavaThread.getCurrentFrameGuess()). */ + public static VFrame newVFrame(Frame f, RegisterMap regMap, JavaThread thread, boolean unsafe, boolean mayBeImprecise) { + if (f.isInterpretedFrame()) { + return new InterpretedVFrame(f, regMap, thread); + } + + if (!VM.getVM().isCore()) { + CodeBlob cb; + if (unsafe) { + cb = VM.getVM().getCodeCache().findBlobUnsafe(f.getPC()); + } else { + cb = VM.getVM().getCodeCache().findBlob(f.getPC()); + } + + if (cb != null) { + if (cb.isNMethod()) { + NMethod nm = (NMethod) cb; + // Compiled method (native stub or Java code) + ScopeDesc scope = null; + // FIXME: should revisit the check of isDebugging(); should not be necessary + if (mayBeImprecise || VM.getVM().isDebugging()) { + scope = nm.getScopeDescNearDbg(f.getPC()); + } else { + scope = nm.getScopeDescAt(f.getPC()); + } + return new CompiledVFrame(f, regMap, thread, scope, mayBeImprecise); + } + + if (f.isRuntimeFrame()) { + // This is a conversion frame or a Stub routine. Skip this frame and try again. + RegisterMap tempMap = regMap.copy(); + Frame s = f.sender(tempMap); + return newVFrame(s, tempMap, thread, unsafe, false); + } + } + } + + // External frame + return new ExternalVFrame(f, regMap, thread, mayBeImprecise); + } + + /** Factory method for creating vframes. This is equivalent to + calling the above version with the "unsafe" and "imprecise" + flags set to false. */ + public static VFrame newVFrame(Frame f, RegisterMap regMap, JavaThread thread) { + return newVFrame(f, regMap, thread, false, false); + } + + /** Accessors */ + public Frame getFrame() { return fr; } + public RegisterMap getRegisterMap() { return regMap; } + public JavaThread getThread() { return thread; } + + /** Returns the sender vframe */ + public VFrame sender() { + if (Assert.ASSERTS_ENABLED) { + Assert.that(isTop(), "just checking"); + } + return sender(false); + } + + /** Returns the sender vframe; takes argument for debugging situation */ + public VFrame sender(boolean mayBeImprecise) { + RegisterMap tempMap = (RegisterMap) getRegisterMap().clone(); + if (fr.isFirstFrame()) { + return null; + } + Frame s = fr.realSender(tempMap); + // ia64 in 1.4.1 only has java frames and no entryFrame + // so "s" can be null here for the first frame. + if (s == null) { + Assert.that(VM.getVM().getCPU().equals("ia64"), "Only ia64 should have null here"); + return null; + } + if (s.isFirstFrame()) { + return null; + } + return VFrame.newVFrame(s, tempMap, getThread(), VM.getVM().isDebugging(), mayBeImprecise); + } + + /** Returns the next javaVFrame on the stack (skipping all other + kinds of frames). In the debugging situation, allows the + "imprecise" flag to propagate up the stack. We must not assert + that a ScopeDesc exists for the topmost compiled frame on the + stack. */ + public JavaVFrame javaSender() { + boolean imprecise = false; + + // Hack for debugging + if (VM.getVM().isDebugging()) { + if (!isJavaFrame()) { + imprecise = mayBeImpreciseDbg(); + } + } + VFrame f = sender(imprecise); + while (f != null) { + if (f.isJavaFrame()) { + return (JavaVFrame) f; + } + f = f.sender(imprecise); + } + return null; + } + + /** Answers if the this is the top vframe in the frame, i.e., if the + sender vframe is in the caller frame */ + public boolean isTop() { + return true; + } + + /** Returns top vframe within same frame (see isTop()) */ + public VFrame top() { + VFrame vf = this; + while (!vf.isTop()) { + vf = vf.sender(); + } + return vf; + } + + /** Type testing operations */ + public boolean isEntryFrame() { return false; } + public boolean isJavaFrame() { return false; } + public boolean isInterpretedFrame() { return false; } + public boolean isCompiledFrame() { return false; } + public boolean isDeoptimized() { return false; } + + /** An indication of whether this VFrame is "precise" or a best + guess. This is used in the debugging system to handle the top + frame on the stack, which, since the system will in general not + be at a safepoint, has to make some guesses about exactly where + in the execution it is. Any debugger should indicate to the user + that the information for this frame may not be 100% correct. + FIXME: may need to move this up into VFrame instead of keeping + it in CompiledVFrame. */ + public boolean mayBeImpreciseDbg() { return false; } + + /** Printing operations */ + public void print() { + printOn(System.out); + } + + public void printOn(PrintStream tty) { + if (VM.getVM().wizardMode()) { + fr.printValueOn(tty); + } + } + + public void printValue() { + printValueOn(System.out); + } + + public void printValueOn(PrintStream tty) { + printOn(tty); + } +}