--- /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);
+ }
+}