interpret.cc (_Jv_InterpMethod::check_handler): New method.

2007-02-15  Kyle Galloway  <kgallowa@redhat.com>
	
	* interpret.cc (_Jv_InterpMethod::check_handler): New method.
    * interpret-run.cc: Change the catch section to report exception
    events and to use the new check_handler method.
    * include/java-interp.h (_Jv_InterpMethod): Add check_handler.
    * gnu/gcj/jvmti/ExceptionEvent.java: New file.
    * gnu/gcj/jvmti/ExceptionEvent.h: New file.
    * gnu/gcj/jvmti/natExceptionEvent.cc: New file.
    * libjava/classpath/lib/gnu/gcj/jvmti/ExceptionEvent.class: New
    file.
    * sources.am: Added ExceptionEvent.java.
    * Makefile.am: Added natExceptionEvent.cc
    * Makefile.in: Regenerated.
    * include/Makefile.in: Regenerated.
    * gcj/Makefile.in: Regenerated.

From-SVN: r122019

3 files changed, 199 insertions, 0 deletions

diff --git a/libjava/gnu/gcj/jvmti/ExceptionEvent.h b/libjava/gnu/gcj/jvmti/ExceptionEvent.h
new file mode 100644
index 0000000..825c339
--- /dev/null
+++ b/libjava/gnu/gcj/jvmti/ExceptionEvent.h
@@ -0,0 +1,44 @@
+
+// DO NOT EDIT THIS FILE - it is machine generated -*- c++ -*-
+
+#ifndef __gnu_gcj_jvmti_ExceptionEvent__
+#define __gnu_gcj_jvmti_ExceptionEvent__
+
+#pragma interface
+
+#include <java/lang/Object.h>
+extern "Java"
+{
+  namespace gnu
+  {
+    namespace gcj
+    {
+      namespace jvmti
+      {
+          class ExceptionEvent;
+      }
+    }
+  }
+}
+
+class gnu::gcj::jvmti::ExceptionEvent : public ::java::lang::Object
+{
+
+  ExceptionEvent(::java::lang::Thread *, jlong, jlong, ::java::lang::Throwable *, jlong, jlong);
+public:
+  static void postExceptionEvent(::java::lang::Thread *, jlong, jlong, ::java::lang::Throwable *, jlong, jlong);
+  virtual void sendEvent();
+  virtual void checkCatch();
+private:
+  jlong __attribute__((aligned(__alignof__( ::java::lang::Object)))) _throwMeth;
+  jlong _throwLoc;
+  jlong _catchMeth;
+  jlong _catchLoc;
+  ::java::lang::Thread * _thread;
+  ::java::lang::Throwable * _ex;
+  static ::java::util::WeakHashMap * _exMap;
+public:
+  static ::java::lang::Class class$;
+};
+
+#endif // __gnu_gcj_jvmti_ExceptionEvent__
diff --git a/libjava/gnu/gcj/jvmti/ExceptionEvent.java b/libjava/gnu/gcj/jvmti/ExceptionEvent.java
new file mode 100644
index 0000000..26ddec2
--- /dev/null
+++ b/libjava/gnu/gcj/jvmti/ExceptionEvent.java
@@ -0,0 +1,96 @@
+// ExceptionEvent - an exception event for JVMTI
+
+/* Copyright (C) 2007  Free Software Foundation
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+
+package gnu.gcj.jvmti;
+
+import java.util.WeakHashMap;
+
+/**
+ * Class to create and send JVMTI Exception events
+ *
+ * @author Kyle Galloway (kgallowa@redhat.com)
+ */
+public class ExceptionEvent
+{
+  // Information about where the exception was thrown
+  private long _throwMeth, _throwLoc;
+  
+  // Information about where the exception was or can be caught
+  private long _catchMeth, _catchLoc;
+  
+  // Thread where the exception occurred
+  private Thread _thread;
+  
+  // The exception
+  private Throwable _ex;
+  
+  // A hash map of the exceptions we've already seen in a thread's call stack
+  private static WeakHashMap<Thread, Throwable> _exMap = new WeakHashMap<Thread, Throwable>();
+  
+  /**
+   * Constructs a new ExceptionEvent and sends it.  If it is not caught
+   * within the frame where it was thrown (catchMeth and catchLoc are null),
+   * check_catch will check for a possible catch further up the call stack 
+   * before marking it uncaught.
+   * 
+   * @param thr the thread where the exception occurred
+   * @param throwMeth the method of the throw (a jmethodID)
+   * @param throwLoc the location of the throw (a jlocation)
+   * @param ex the exception
+   * @param catchMeth the method of the catch (a jmethodID), null indicates
+   * that the exception was not caught in the frame where it was thrown
+   * @param catchLoc the location of the catch (a jlocation), null indicates
+   * that the exception was not caught in the frame where it was thrown
+   */
+  private ExceptionEvent(Thread thr, long throwMeth, long throwLoc,
+		                 Throwable ex, long catchMeth, long catchLoc)
+  {
+    this._thread = thr;
+    this._ex = ex;
+    this._throwMeth = throwMeth;
+    this._throwLoc = throwLoc;
+    this._catchMeth = catchMeth;
+    this._catchLoc = catchLoc;
+  }
+  
+  public static void postExceptionEvent(Thread thr, long throwMeth,
+		                                long throwLoc, Throwable ex,
+		                                long catchMeth, long catchLoc)
+  {
+    // Check to see if there is an entry for this Thread thr in the has map.
+	// If not, add the thread to the hash map and send an ExceptionEvent.
+	if (_exMap.containsKey(thr))
+	  {
+		// Check to see if we are receiving events for the same exception, or a
+		// new one.  If it is not the same exception beign rethrown, send a new
+		// event.
+	    if (!(_exMap.get(thr) == ex))
+	      {
+            _exMap.put(thr, ex);
+            ExceptionEvent event = new ExceptionEvent(thr, throwMeth,
+            		                                  throwLoc, ex, catchMeth,
+            		                                  catchLoc);  
+            event.sendEvent ();
+          }
+	  }
+	else
+	  {
+	    _exMap.put(thr, ex);
+	    ExceptionEvent event = new ExceptionEvent(thr, throwMeth,
+                                                  throwLoc, ex, catchMeth,
+                                                  catchLoc);
+	    event.sendEvent();
+	  }
+  }
+  
+  public native void sendEvent();
+  
+  public native void checkCatch();
+}
diff --git a/libjava/gnu/gcj/jvmti/natExceptionEvent.cc b/libjava/gnu/gcj/jvmti/natExceptionEvent.cc
new file mode 100644
index 0000000..dfc8e66
--- /dev/null
+++ b/libjava/gnu/gcj/jvmti/natExceptionEvent.cc
@@ -0,0 +1,59 @@
+// natExceptionEvent.cc - C++ code for JVMTI Exception events
+
+/* Copyright (C) 2007  Free Software Foundation
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+
+#include <config.h>
+#include <gcj/cni.h>
+#include <gcj/method.h>
+#include <java-interp.h>
+#include <java-insns.h>
+#include <java-assert.h>
+#include <jvmti.h>
+#include <jvmti-int.h>
+
+#include <gnu/gcj/jvmti/ExceptionEvent.h>
+
+void
+gnu::gcj::jvmti::ExceptionEvent::sendEvent ()
+{
+  // Check if the exception is caught somewhere in the interpreted call stack
+  if (_catchMeth == 0 || _catchLoc == 0)
+    checkCatch ();
+    
+  JNIEnv *jni = _Jv_GetCurrentJNIEnv ();
+
+  _Jv_JVMTI_PostEvent (JVMTI_EVENT_EXCEPTION, _thread, jni,
+                       reinterpret_cast<jmethodID> (_throwMeth),
+                       static_cast<jlocation> (_throwLoc), _ex,
+                       reinterpret_cast<jmethodID> (_catchMeth),
+                       static_cast<jlocation> (_catchLoc)); 
+}
+
+// This method looks up the interpreted call stack to see if the exception will
+// eventually be caught by some java method.
+void
+gnu::gcj::jvmti::ExceptionEvent::checkCatch ()
+{
+  _Jv_InterpFrame *frame 
+    = reinterpret_cast<_Jv_InterpFrame *> (_thread->interp_frame);
+  
+  while ((frame = frame->next_interp))
+    {
+	  _Jv_InterpMethod *meth 
+	    = reinterpret_cast<_Jv_InterpMethod *> (frame->self);
+	  pc_t pc = frame->pc;
+		
+	  if (meth->check_handler (&pc, meth, _ex))
+	    {
+	      _catchMeth = reinterpret_cast<jlong> (meth->get_method ());
+	      _catchLoc = meth->insn_index (pc);
+          break;
+	    }
+    }
+}