--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/share/classes/sun/jvm/hotspot/runtime/VFrame.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,206 @@
+/*
+ * Copyright 2000-2006 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.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.isGlueFrame()) {
+          // This is a conversion frame. 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);
+  }
+}