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1dad2ce973
Backends now only contain the essential backend-specific code, and most of the work is moved to frontend code. Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
100 lines
2.6 KiB
Python
100 lines
2.6 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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Simple built-in backend.
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"""
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__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
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__copyright__ = "Copyright 2012-2014, Lluís Vilanova <vilanova@ac.upc.edu>"
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__license__ = "GPL version 2 or (at your option) any later version"
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__maintainer__ = "Stefan Hajnoczi"
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__email__ = "stefanha@linux.vnet.ibm.com"
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from tracetool import out
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PUBLIC = True
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def is_string(arg):
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strtype = ('const char*', 'char*', 'const char *', 'char *')
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if arg.lstrip().startswith(strtype):
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return True
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else:
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return False
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def generate_h_begin(events):
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for event in events:
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out('void _simple_%(api)s(%(args)s);',
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api=event.api(),
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args=event.args)
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out('')
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def generate_h(event):
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out(' _simple_%(api)s(%(args)s);',
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api=event.api(),
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args=", ".join(event.args.names()))
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def generate_c_begin(events):
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out('#include "trace.h"',
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'#include "trace/control.h"',
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'#include "trace/simple.h"',
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'')
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def generate_c(event):
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out('void _simple_%(api)s(%(args)s)',
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'{',
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' TraceBufferRecord rec;',
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api=event.api(),
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args=event.args)
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sizes = []
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for type_, name in event.args:
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if is_string(type_):
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out(' size_t arg%(name)s_len = %(name)s ? MIN(strlen(%(name)s), MAX_TRACE_STRLEN) : 0;',
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name=name)
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strsizeinfo = "4 + arg%s_len" % name
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sizes.append(strsizeinfo)
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else:
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sizes.append("8")
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sizestr = " + ".join(sizes)
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if len(event.args) == 0:
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sizestr = '0'
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out('',
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' if (!trace_event_get_state(%(event_id)s)) {',
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' return;',
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' }',
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'',
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' if (trace_record_start(&rec, %(event_id)s, %(size_str)s)) {',
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' return; /* Trace Buffer Full, Event Dropped ! */',
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' }',
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event_id='TRACE_' + event.name.upper(),
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size_str=sizestr)
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if len(event.args) > 0:
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for type_, name in event.args:
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# string
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if is_string(type_):
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out(' trace_record_write_str(&rec, %(name)s, arg%(name)s_len);',
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name=name)
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# pointer var (not string)
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elif type_.endswith('*'):
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out(' trace_record_write_u64(&rec, (uintptr_t)(uint64_t *)%(name)s);',
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name=name)
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# primitive data type
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else:
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out(' trace_record_write_u64(&rec, (uint64_t)%(name)s);',
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name=name)
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out(' trace_record_finish(&rec);',
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'}',
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'')
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