trace: teach lttng backend to use format strings

This makes the UST backend pay attention to the format string arguments
that are defined when defining payload data. With this you can now
ensure integers are reported in hex mode if you want.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

scripts/tracetool/__init__.py

@@ -136,6 +136,8 @@ class Event(object):
         Properties of the event.
     args : Arguments
         The event arguments.
+    arg_fmts : str
+        The format strings for each argument.
     """
 
     _CRE = re.compile("((?P<props>.*)\s+)?"
@@ -144,10 +146,11 @@ class Event(object):
                       "\s*"
                       "(?:(?:(?P<fmt_trans>\".+),)?\s*(?P<fmt>\".+))?"
                       "\s*")
+    _FMT = re.compile("(%\w+|%.*PRI\S+)")
 
     _VALID_PROPS = set(["disable", "tcg", "tcg-trans", "tcg-exec"])
 
-    def __init__(self, name, props, fmt, args, orig=None):
+    def __init__(self, name, props, fmt, args, arg_fmts, orig=None):
         """
         Parameters
         ----------
@@ -159,13 +162,17 @@ class Event(object):
             Event printing format (or formats).
         args : Arguments
             Event arguments.
+        arg_fmts : list of str
+            Format strings for each argument.
         orig : Event or None
             Original Event before transformation.
+
         """
         self.name = name
         self.properties = props
         self.fmt = fmt
         self.args = args
+        self.arg_fmts = arg_fmts
 
         if orig is None:
             self.original = weakref.ref(self)
@@ -203,6 +210,7 @@ class Event(object):
         if len(fmt_trans) > 0:
             fmt = [fmt_trans, fmt]
         args = Arguments.build(groups["args"])
+        arg_fmts = Event._FMT.findall(fmt)
 
         if "tcg-trans" in props:
             raise ValueError("Invalid property 'tcg-trans'")
@@ -213,7 +221,7 @@ class Event(object):
         if "tcg" in props and isinstance(fmt, str):
             raise ValueError("Events with 'tcg' property must have two formats")
 
-        return Event(name, props, fmt, args)
+        return Event(name, props, fmt, args, arg_fmts)
 
     def __repr__(self):
         """Evaluable string representation for this object."""

scripts/tracetool/format/ust_events_h.py

@@ -63,13 +63,20 @@ def generate(events, backend):
                 name=e.name,
                 args=", ".join(", ".join(i) for i in e.args))
 
-            for t, n in e.args:
-                if ('int' in t) or ('long' in t) or ('unsigned' in t) or ('size_t' in t):
+            types = e.args.types()
+            names = e.args.names()
+            fmts = e.arg_fmts
+            for t,n,f in zip(types, names, fmts):
+                if ('char *' in t) or ('char*' in t):
+                    out('       ctf_string(' + n + ', ' + n + ')')
+                elif ("%p" in f) or ("x" in f) or ("PRIx" in f):
+                    out('       ctf_integer_hex('+ t + ', ' + n + ', ' + n + ')')
+                elif ("ptr" in t) or ("*" in t):
+                    out('       ctf_integer_hex('+ t + ', ' + n + ', ' + n + ')')
+                elif ('int' in t) or ('long' in t) or ('unsigned' in t) or ('size_t' in t):
                     out('       ctf_integer(' + t + ', ' + n + ', ' + n + ')')
                 elif ('double' in t) or ('float' in t):
                     out('       ctf_float(' + t + ', ' + n + ', ' + n + ')')
-                elif ('char *' in t) or ('char*' in t):
-                    out('       ctf_string(' + n + ', ' + n + ')')
                 elif ('void *' in t) or ('void*' in t):
                     out('       ctf_integer_hex(unsigned long, ' + n + ', ' + n + ')')