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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Simple built-in backend.
"""
__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
__copyright__ = "Copyright 2012-2014, 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
PUBLIC = True
def is_string(arg):
strtype = ('const char*', 'char*', 'const char *', 'char *')
if arg.lstrip().startswith(strtype):
return True
else:
return False
def c(events):
out('#include "trace.h"',
'#include "trace/control.h"',
'#include "trace/simple.h"',
'',
)
for num, event in enumerate(events):
out('void %(api)s(%(args)s)',
'{',
' TraceBufferRecord rec;',
api = event.api(),
args = event.args,
)
sizes = []
for type_, name in event.args:
if is_string(type_):
out(' size_t arg%(name)s_len = %(name)s ? MIN(strlen(%(name)s), MAX_TRACE_STRLEN) : 0;',
name = name,
)
strsizeinfo = "4 + arg%s_len" % name
sizes.append(strsizeinfo)
else:
sizes.append("8")
sizestr = " + ".join(sizes)
if len(event.args) == 0:
sizestr = '0'
out('',
' TraceEvent *eventp = trace_event_id(%(event_enum)s);',
' bool _state = trace_event_get_state_dynamic(eventp);',
' if (!_state) {',
' return;',
' }',
'',
' if (trace_record_start(&rec, %(event_id)s, %(size_str)s)) {',
' return; /* Trace Buffer Full, Event Dropped ! */',
' }',
event_enum = 'TRACE_' + event.name.upper(),
event_id = num,
size_str = sizestr,
)
if len(event.args) > 0:
for type_, name in event.args:
# string
if is_string(type_):
out(' trace_record_write_str(&rec, %(name)s, arg%(name)s_len);',
name = name,
)
# pointer var (not string)
elif type_.endswith('*'):
out(' trace_record_write_u64(&rec, (uintptr_t)(uint64_t *)%(name)s);',
name = name,
)
# primitive data type
else:
out(' trace_record_write_u64(&rec, (uint64_t)%(name)s);',
name = name,
)
out(' trace_record_finish(&rec);',
'}',
'')
def h(events):
for event in events:
out('void %(api)s(%(args)s);',
api = event.api(),
args = event.args,
)
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