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perf/scripts: Tuple was set from long in both branches in python_process_event() 

This is a fix to the signed/unsigned field handling in the
Python scripting engine, based on a patch from Roel Kluin.

Basically, Python wants to use a PyInt (which is internally a
long) if it can i.e. if the value will fit into that type.  If
not, it stores it into a PyLong, which isn't actually a long,
but an arbitrary-precision integer variable.

The code below is similar to to what Python does internally, and
it seems to work as expected on the x86 and x86_64 sytems I
tested it on.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Roel Kluin <roel.kluin@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: rostedt@goodmis.org
LKML-Reference: <1270184305.6422.10.camel@tropicana>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Tom Zanussi 2010-04-01 23:58:25 -05:00 committed by Ingo Molnar
parent 8bb39f9aa0
commit b1dcc03cb8
1 changed files with 12 additions and 5 deletions
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17
tools/perf/util/scripting-engines/trace-event-python.c
View File

@ -208,7 +208,7 @@ static void python_process_event(int cpu, void *data,
int size __unused,
unsigned long long nsecs, char *comm)
{
PyObject *handler, *retval, *context, *t;
PyObject *handler, *retval, *context, *t, *obj;
static char handler_name[256];
struct format_field *field;
unsigned long long val;
@ -256,16 +256,23 @@ static void python_process_event(int cpu, void *data,
offset &= 0xffff;
} else
offset = field->offset;
PyTuple_SetItem(t, n++,
PyString_FromString((char *)data + offset));
obj = PyString_FromString((char *)data + offset);
} else { /* FIELD_IS_NUMERIC */
val = read_size(data + field->offset, field->size);
if (field->flags & FIELD_IS_SIGNED) {
PyTuple_SetItem(t, n++, PyInt_FromLong(val));
if ((long long)val >= LONG_MIN &&
(long long)val <= LONG_MAX)
obj = PyInt_FromLong(val);
else
obj = PyLong_FromLongLong(val);
} else {
PyTuple_SetItem(t, n++, PyInt_FromLong(val));
if (val <= LONG_MAX)
obj = PyInt_FromLong(val);
else
obj = PyLong_FromUnsignedLongLong(val);
}
}
PyTuple_SetItem(t, n++, obj);
}
if (_PyTuple_Resize(&t, n) == -1)