debug ps(x) and psf(x)

[Christian Thalinger]

During debugging of MethodHandle invokes, where some stacks were
corrupted because of bugs, I found it very useful to print stacktraces
of particular threads.  As I couldn't find similar methods I added these
(psx and psfx) myself:

diff --git a/src/share/vm/utilities/debug.cpp b/src/share/vm/utilities/debug.cpp
--- a/src/share/vm/utilities/debug.cpp
+++ b/src/share/vm/utilities/debug.cpp
@@ -396,12 +396,9 @@
 extern "C" void pa(intptr_t p)   { ((AllocatedObj*) p)->print(); }
 extern "C" void findpc(intptr_t x);
 
-extern "C" void ps() { // print stack
-  Command c("ps");
-
-
-  // Prints the stack of the current Java thread
-  JavaThread* p = JavaThread::active();
+extern "C" void psx(intptr_t x) { // print stack
+  Command c("psx");
+  JavaThread* p = (JavaThread*) x;
   tty->print(" for thread: ");
   p->print();
   tty->cr();
@@ -416,25 +413,34 @@
     f = f.sender(&reg_map);
     tty->print("(guessing starting frame id=%#p based on current fp)\n", f.id());
     p->trace_stack_from(vframe::new_vframe(&f, &reg_map, p));
-  pd_ps(f);
+    pd_ps(f);
   }
-
 }
 
+extern "C" void ps() { // print stack of current Java thread
+  Command c("ps");
+  JavaThread* p = JavaThread::active();
+  psx((intptr_t) p);
+}
 
-extern "C" void psf() { // print stack frames
-  {
-    Command c("psf");
-    JavaThread* p = JavaThread::active();
-    tty->print(" for thread: ");
-    p->print();
-    tty->cr();
-    if (p->has_last_Java_frame()) {
-      p->trace_frames();
-    }
+
+extern "C" void psfx(intptr_t x) { // print stack frames
+  Command c("psfx");
+  JavaThread* p = (JavaThread*) x;
+  tty->print(" for thread: ");
+  p->print();
+  tty->cr();
+  if (p->has_last_Java_frame()) {
+    p->trace_frames();
   }
 }
 
+extern "C" void psf() { // print stack frames of current Java thread
+  Command c("psf");
+  JavaThread* p = JavaThread::active();
+  psfx((intptr_t) p);
+}
+
 
 extern "C" void threads() {
   Command c("threads");

Could we add these or did I miss any methods which are exactly doing
that?

-- Christian