From 75552bd3bb4e7f3cf4dab81a5c81cf73b1d3fb99 Mon Sep 17 00:00:00 2001
From: Scott Lystig Fritchie <slfritchie@snookles.com>
Date: Fri, 17 Aug 2012 03:24:20 -0500
Subject: Relocate bodies of DTrace probes to the statically-linked VM.

Due to various operating systems (in both the DTrace and SystemTap
worlds) not fully supporting DTrace probes (or SystemTap-compatibility
mode probes) in shared libraries, we relocate those probes to the
statically-linked virtual machine.  This could be seen as pollution
of the pristine VM by a (yet) experimental feature.  However:

1. This code can be eliminated completely by the C preprocessor.
2. Leaving the probes in the dyntrace NIF shared library simply
   does not work correctly on too many platforms.

*Many* thanks to Macneil Shonle at Basho for assisting when my
RSI-injured fingers gave out.

Tested on:

* CentOS 5, SystemTap 1.3
* Solaris 10 (note)
* Solaris 11
* OpenIndiana 151
* SmartOS 20120809T221258Z
* FreeBSD 9.0-RELEASE (note)

I had hoped to be able to test CentOS 6 + SystemTap 1.7, but the
details of dealing with all dependencies for a 2.6.32-279.5.1.el6.x86_64
kernel are too time consuming right now.

(note: Solaris 10 and FreeBSD 9.0-RELEASE can take a long time to compile)
---
 lib/runtime_tools/examples/user-probe-n.systemtap | 53 +++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 lib/runtime_tools/examples/user-probe-n.systemtap

(limited to 'lib/runtime_tools/examples/user-probe-n.systemtap')

diff --git a/lib/runtime_tools/examples/user-probe-n.systemtap b/lib/runtime_tools/examples/user-probe-n.systemtap
new file mode 100644
index 0000000000..6aa415bb67
--- /dev/null
+++ b/lib/runtime_tools/examples/user-probe-n.systemtap
@@ -0,0 +1,53 @@
+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Scott Lystig Fritchie and Andreas Schultz, 2011-2012. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * %CopyrightEnd%
+ */
+/*
+ * Note: This file assumes that you're using the non-SMP-enabled Erlang
+ *       virtual machine, "beam".  The SMP-enabled VM is called "beam.smp".
+ *       Note that other variations of the virtual machine also have
+ *       different names, e.g. the debug build of the SMP-enabled VM
+ *       is "beam.debug.smp".
+ *
+ *       To use a different virtual machine, replace each instance of
+ *       "beam" with "beam.smp" or the VM name appropriate to your
+ *       environment.
+ */
+
+probe process("beam").mark("user_trace-n0")
+{
+    printf("probe n0: %s %s %d %d %d %d '%s' '%s' '%s' '%s'\n",
+           user_string($arg1),
+           $arg2 == NULL ? "" : user_string($arg2),
+           $arg3, $arg4, $arg5, $arg6,
+           $arg7 == NULL ? "" : user_string($arg7),
+           $arg8 == NULL ? "" : user_string($arg8),
+           $arg9 == NULL ? "" : user_string($arg9),
+           $arg9 == NULL ? "" : user_string($arg9));
+}
+
+probe process("beam").mark("user_trace-n1")
+{
+    printf("probe n1: %s %s %d %d %d %d '%s' '%s' '%s' '%s'\n",
+           user_string($arg1),
+           $arg2 == NULL ? "" : user_string($arg2),
+           $arg3, $arg4, $arg5, $arg6,
+           $arg7 == NULL ? "" : user_string($arg7),
+           $arg8 == NULL ? "" : user_string($arg8),
+           $arg9 == NULL ? "" : user_string($arg9),
+           $arg9 == NULL ? "" : user_string($arg9));
+}
-- 
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