tracetool: Add support for the 'dtrace' backend

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

scripts/tracetool/__init__.py

@@ -212,7 +212,8 @@ def try_import(mod_name, attr_name = None, attr_default = None):
         return False, None
 
 
-def generate(fevents, format, backend):
+def generate(fevents, format, backend,
+             binary = None, probe_prefix = None):
     """Generate the output for the given (format, backend) pair.
 
     Parameters
@@ -223,6 +224,10 @@ def generate(fevents, format, backend):
         Output format name.
     backend : str
         Output backend name.
+    binary : str or None
+        See tracetool.backend.dtrace.BINARY.
+    probe_prefix : str or None
+        See tracetool.backend.dtrace.PROBEPREFIX.
     """
     # fix strange python error (UnboundLocalError tracetool)
     import tracetool
@@ -245,6 +250,10 @@ def generate(fevents, format, backend):
         raise TracetoolError("backend '%s' not compatible with format '%s'" %
                              (backend, format))
 
+    import tracetool.backend.dtrace
+    tracetool.backend.dtrace.BINARY = binary
+    tracetool.backend.dtrace.PROBEPREFIX = probe_prefix
+
     events = _read_events(fevents)
 
     if backend == "nop":

scripts/tracetool/backend/dtrace.py

@@ -0,0 +1,97 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+DTrace/SystemTAP backend.
+"""
+
+__author__     = "Lluís Vilanova <vilanova@ac.upc.edu>"
+__copyright__  = "Copyright 2012, Lluís Vilanova <vilanova@ac.upc.edu>"
+__license__    = "GPL version 2 or (at your option) any later version"
+
+__maintainer__ = "Stefan Hajnoczi"
+__email__      = "stefanha@linux.vnet.ibm.com"
+
+
+from tracetool import out
+
+
+PROBEPREFIX = None
+
+def _probeprefix():
+    if PROBEPREFIX is None:
+        raise ValueError("you must set PROBEPREFIX")
+    return PROBEPREFIX
+
+
+BINARY = None
+
+def _binary():
+    if BINARY is None:
+        raise ValueError("you must set BINARY")
+    return BINARY
+
+
+def c(events):
+    pass
+
+
+def h(events):
+    out('#include "trace-dtrace.h"',
+        '')
+
+    for e in events:
+        out('static inline void trace_%(name)s(%(args)s) {',
+            '    QEMU_%(uppername)s(%(argnames)s);',
+            '}',
+            name = e.name,
+            args = e.args,
+            uppername = e.name.upper(),
+            argnames = ", ".join(e.args.names()),
+            )
+
+
+def d(events):
+    out('provider qemu {')
+
+    for e in events:
+        args = str(e.args)
+
+        # DTrace provider syntax expects foo() for empty
+        # params, not foo(void)
+        if args == 'void':
+            args = ''
+
+        # Define prototype for probe arguments
+        out('',
+            'probe %(name)s(%(args)s);',
+            name = e.name,
+            args = args,
+            )
+
+    out('',
+        '};')
+
+
+def stap(events):
+    for e in events:
+        # Define prototype for probe arguments
+        out('probe %(probeprefix)s.%(name)s = process("%(binary)s").mark("%(name)s")',
+            '{',
+            probeprefix = _probeprefix(),
+            name = e.name,
+            binary = _binary(),
+            )
+
+        i = 1
+        if len(e.args) > 0:
+            for name in e.args.names():
+                # 'limit' is a reserved keyword
+                if name == 'limit':
+                    name = '_limit'
+                out('  %s = $arg%d;' % (name.lstrip(), i))
+                i += 1
+
+        out('}')
+
+    out()

scripts/tracetool/format/d.py

@@ -0,0 +1,20 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Generate .d file (DTrace only).
+"""
+
+__author__     = "Lluís Vilanova <vilanova@ac.upc.edu>"
+__copyright__  = "Copyright 2012, Lluís Vilanova <vilanova@ac.upc.edu>"
+__license__    = "GPL version 2 or (at your option) any later version"
+
+__maintainer__ = "Stefan Hajnoczi"
+__email__      = "stefanha@linux.vnet.ibm.com"
+
+
+from tracetool import out
+
+
+def begin(events):
+    out('/* This file is autogenerated by tracetool, do not edit. */')

scripts/tracetool/format/stap.py

@@ -0,0 +1,20 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Generate .stp file (DTrace with SystemTAP only).
+"""
+
+__author__     = "Lluís Vilanova <vilanova@ac.upc.edu>"
+__copyright__  = "Copyright 2012, Lluís Vilanova <vilanova@ac.upc.edu>"
+__license__    = "GPL version 2 or (at your option) any later version"
+
+__maintainer__ = "Stefan Hajnoczi"
+__email__      = "stefanha@linux.vnet.ibm.com"
+
+
+from tracetool import out
+
+
+def begin(events):
+    out('/* This file is autogenerated by tracetool, do not edit. */')