Index: Python/ceval.c
===================================================================
--- Python/ceval.c	(revision 78334)
+++ Python/ceval.c	(working copy)
@@ -19,6 +19,10 @@
 
 #include <ctype.h>
 
+#ifdef WITH_DTRACE
+#include "pydtrace.h"
+#endif
+
 #ifndef WITH_TSC
 
 #define READ_TIMESTAMP(var)
@@ -671,7 +675,56 @@
 			  NULL);
 }
 
+#ifdef WITH_DTRACE
+static void
+dtrace_entry(PyFrameObject *f)
+{
+	const char *filename;
+	const char *fname;
+	int lineno;
+	
+	filename = PyString_AsString(f->f_code->co_filename);
+	fname = PyString_AsString(f->f_code->co_name);
+	lineno = PyCode_Addr2Line(f->f_code, f->f_lasti);
 
+	PYTHON_FUNCTION_ENTRY((char *)filename, (char *)fname, lineno);
+
+	/*
+	 * Currently a USDT tail-call will not receive the correct arguments.
+	 * Disable the tail call here.
+	 */
+#if defined(__sparc)
+	asm("nop");
+#endif
+}
+
+static void
+dtrace_return(PyFrameObject *f)
+{
+	const char *filename;
+	const char *fname;
+	int lineno;
+	
+	filename = PyString_AsString(f->f_code->co_filename);
+	fname = PyString_AsString(f->f_code->co_name);
+	lineno = PyCode_Addr2Line(f->f_code, f->f_lasti);
+	PYTHON_FUNCTION_RETURN((char *)filename, (char *)fname, lineno);
+
+	/*
+	 * Currently a USDT tail-call will not receive the correct arguments.
+	 * Disable the tail call here.
+	 */
+#if defined(__sparc)
+	asm("nop");
+#endif
+}
+#else
+#define	PYTHON_FUNCTION_ENTRY_ENABLED() 0
+#define	PYTHON_FUNCTION_RETURN_ENABLED() 0
+#define	dtrace_entry(f)
+#define	dtrace_return(f)
+#endif
+
 /* Interpreter main loop */
 
 PyObject *
@@ -909,6 +962,9 @@
 		}
 	}
 
+        if (PYTHON_FUNCTION_ENTRY_ENABLED())
+                dtrace_entry(f);
+
 	co = f->f_code;
 	names = co->co_names;
 	consts = co->co_consts;
@@ -3001,6 +3057,8 @@
 
 	/* pop frame */
 exit_eval_frame:
+	if (PYTHON_FUNCTION_RETURN_ENABLED())
+		dtrace_return(f);
 	Py_LeaveRecursiveCall();
 	tstate->frame = f->f_back;
 
Index: configure
===================================================================
--- configure	(revision 78334)
+++ configure	(working copy)
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in Revision: 78194 .
+# From configure.in Revision: 78202 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.61 for python 2.7.
 #
@@ -724,6 +724,8 @@
 USE_THREAD_MODULE
 LDLAST
 THREADOBJ
+DTRACEOBJS
+DTRACEHDRS
 DLINCLDIR
 DYNLOADFILE
 MACHDEP_OBJS
@@ -1368,6 +1370,7 @@
   --with(out)-tsc         enable/disable timestamp counter profile
   --with(out)-pymalloc    disable/enable specialized mallocs
   --with-valgrind         Enable Valgrind support
+  --with(out)-dtrace      disable/enable dtrace support
   --with-wctype-functions use wctype.h functions
   --with-fpectl           enable SIGFPE catching
   --with-libm=STRING      math library
@@ -17992,6 +17995,50 @@
 
 fi
 
+# Check for dtrace support
+{ echo "$as_me:$LINENO: checking for --with-dtrace" >&5
+echo $ECHO_N "checking for --with-dtrace... $ECHO_C" >&6; }
+
+# Check whether --with-dtrace was given.
+if test "${with_dtrace+set}" = set; then
+  withval=$with_dtrace;
+fi
+
+
+if test ! -z "$with_dtrace"
+then
+    if dtrace -G -o /dev/null -s $srcdir/Include/pydtrace.d 2>/dev/null
+    then
+
+cat >>confdefs.h <<\_ACEOF
+#define WITH_DTRACE 1
+_ACEOF
+
+	with_dtrace="Sun"
+	DTRACEOBJS="Python/dtrace.o"
+	DTRADEHDRS=""
+    elif dtrace -h -o /dev/null -s $srcdir/Include/pydtrace.d
+    then
+
+cat >>confdefs.h <<\_ACEOF
+#define WITH_DTRACE 1
+_ACEOF
+
+	with_dtrace="Apple"
+	DTRACEOBJS=""
+	DTRADEHDRS="pydtrace.h"
+    else
+	with_dtrace="no"
+    fi
+else
+    with_dtrace="no"
+fi
+
+{ echo "$as_me:$LINENO: result: $with_dtrace" >&5
+echo "${ECHO_T}$with_dtrace" >&6; }
+
+
+
 # Check for --with-wctype-functions
 { echo "$as_me:$LINENO: checking for --with-wctype-functions" >&5
 echo $ECHO_N "checking for --with-wctype-functions... $ECHO_C" >&6; }
@@ -28557,6 +28604,8 @@
 USE_THREAD_MODULE!$USE_THREAD_MODULE$ac_delim
 LDLAST!$LDLAST$ac_delim
 THREADOBJ!$THREADOBJ$ac_delim
+DTRACEOBJS!$DTRACEOBJS$ac_delim
+DTRACEHDRS!$DTRACEHDRS$ac_delim
 DLINCLDIR!$DLINCLDIR$ac_delim
 DYNLOADFILE!$DYNLOADFILE$ac_delim
 MACHDEP_OBJS!$MACHDEP_OBJS$ac_delim
@@ -28575,7 +28624,7 @@
 LTLIBOBJS!$LTLIBOBJS$ac_delim
 _ACEOF
 
-  if test `sed -n "s/.*$ac_delim\$/X/p" conf$$subs.sed | grep -c X` = 27; then
+  if test `sed -n "s/.*$ac_delim\$/X/p" conf$$subs.sed | grep -c X` = 29; then
     break
   elif $ac_last_try; then
     { { echo "$as_me:$LINENO: error: could not make $CONFIG_STATUS" >&5
Index: configure.in
===================================================================
--- configure.in	(revision 78334)
+++ configure.in	(working copy)
@@ -2570,6 +2570,38 @@
     )
 fi
 
+# Check for dtrace support
+AC_MSG_CHECKING(for --with-dtrace)
+AC_ARG_WITH(dtrace,
+            AC_HELP_STRING(--with(out)-dtrace, disable/enable dtrace support))
+
+if test ! -z "$with_dtrace"
+then
+    if dtrace -G -o /dev/null -s $srcdir/Include/pydtrace.d 2>/dev/null
+    then
+	AC_DEFINE(WITH_DTRACE, 1, 
+	 [Define if you want to compile in Dtrace support])
+	with_dtrace="Sun"
+	DTRACEOBJS="Python/dtrace.o"
+	DTRADEHDRS=""
+    elif dtrace -h -o /dev/null -s $srcdir/Include/pydtrace.d
+    then
+	AC_DEFINE(WITH_DTRACE, 1, 
+	 [Define if you want to compile in Dtrace support])
+	with_dtrace="Apple"
+	DTRACEOBJS=""
+	DTRADEHDRS="pydtrace.h"
+    else
+	with_dtrace="no"
+    fi
+else
+    with_dtrace="no"
+fi
+
+AC_MSG_RESULT($with_dtrace)
+AC_SUBST(DTRACEOBJS)
+AC_SUBST(DTRACEHDRS)
+
 # Check for --with-wctype-functions
 AC_MSG_CHECKING(for --with-wctype-functions)
 AC_ARG_WITH(wctype-functions, 
Index: Makefile.pre.in
===================================================================
--- Makefile.pre.in	(revision 78334)
+++ Makefile.pre.in	(working copy)
@@ -296,6 +296,7 @@
 		Python/formatter_unicode.o \
 		Python/formatter_string.o \
 		Python/$(DYNLOADFILE) \
+		@DTRACEOBJS@ \
 		$(LIBOBJS) \
 		$(MACHDEP_OBJS) \
 		$(THREADOBJ)
@@ -585,6 +586,18 @@
 Python/formatter_string.o: $(srcdir)/Python/formatter_string.c \
 				$(STRINGLIB_HEADERS)
 
+# Only needed with --with-dtrace
+buildinclude:
+	mkdir -p Include
+
+Include/pydtrace.h: buildinclude $(srcdir)/Include/pydtrace.d
+	dtrace -o $@ $(DFLAGS) -C -h -s $(srcdir)/Include/pydtrace.d
+
+Python/ceval.o: Include/pydtrace.h
+
+Python/dtrace.o: buildinclude $(srcdir)/Include/pydtrace.d Python/ceval.o
+	dtrace -o $@ $(DFLAGS) -C -G -s $(srcdir)/Include/pydtrace.d Python/ceval.o
+
 ############################################################################
 # Header files
 
@@ -1232,6 +1245,6 @@
 .PHONY: frameworkinstall frameworkinstallframework frameworkinstallstructure
 .PHONY: frameworkinstallmaclib frameworkinstallapps frameworkinstallunixtools
 .PHONY: frameworkaltinstallunixtools recheck autoconf clean clobber distclean 
-.PHONY: smelly funny patchcheck
+.PHONY: smelly funny patchcheck buildinclude
 
 # IF YOU PUT ANYTHING HERE IT WILL GO AWAY
Index: pyconfig.h.in
===================================================================
--- pyconfig.h.in	(revision 78334)
+++ pyconfig.h.in	(working copy)
@@ -1046,6 +1046,9 @@
 /* Define if you want documentation strings in extension modules */
 #undef WITH_DOC_STRINGS
 
+/* Define if you want to compile in Dtrace support */
+#undef WITH_DTRACE
+
 /* Define if you want to use the new-style (Openstep, Rhapsody, MacOS) dynamic
    linker (dyld) instead of the old-style (NextStep) dynamic linker (rld).
    Dyld is necessary to support frameworks. */