scripts/tracetool/backend/simple.py

   1 #!/usr/bin/env python
   2 # -*- coding: utf-8 -*-
   3
   4 """
   5 Simple built-in backend.
   6 """
   7
   8 __author__     = "Lluís Vilanova <vilanova@ac.upc.edu>"
   9 __copyright__  = "Copyright 2012-2017, Lluís Vilanova <vilanova@ac.upc.edu>"
  10 __license__    = "GPL version 2 or (at your option) any later version"
  11
  12 __maintainer__ = "Stefan Hajnoczi"
  13 __email__      = "stefanha@linux.vnet.ibm.com"
  14
  15
  16 from tracetool import out
  17
  18
  19 PUBLIC = True
  20
  21
  22 def is_string(arg):
  23     strtype = ('const char*', 'char*', 'const char *', 'char *')
  24     arg_strip = arg.lstrip()
  25     if arg_strip.startswith(strtype) and arg_strip.count('*') == 1:
  26         return True
  27     else:
  28         return False
  29
  30
  31 def generate_h_begin(events, group):
  32     for event in events:
  33         out('void _simple_%(api)s(%(args)s);',
  34             api=event.api(),
  35             args=event.args)
  36     out('')
  37
  38
  39 def generate_h(event, group):
  40     out('    _simple_%(api)s(%(args)s);',
  41         api=event.api(),
  42         args=", ".join(event.args.names()))
  43
  44
  45 def generate_h_backend_dstate(event, group):
  46     out('    trace_event_get_state_dynamic_by_id(%(event_id)s) || \\',
  47         event_id="TRACE_" + event.name.upper())
  48
  49
  50 def generate_c_begin(events, group):
  51     out('#include "qemu/osdep.h"',
  52         '#include "trace/control.h"',
  53         '#include "trace/simple.h"',
  54         '')
  55
  56
  57 def generate_c(event, group):
  58     out('void _simple_%(api)s(%(args)s)',
  59         '{',
  60         '    TraceBufferRecord rec;',
  61         api=event.api(),
  62         args=event.args)
  63     sizes = []
  64     for type_, name in event.args:
  65         if is_string(type_):
  66             out('    size_t arg%(name)s_len = %(name)s ? MIN(strlen(%(name)s), MAX_TRACE_STRLEN) : 0;',
  67                 name=name)
  68             strsizeinfo = "4 + arg%s_len" % name
  69             sizes.append(strsizeinfo)
  70         else:
  71             sizes.append("8")
  72     sizestr = " + ".join(sizes)
  73     if len(event.args) == 0:
  74         sizestr = '0'
  75
  76     event_id = 'TRACE_' + event.name.upper()
  77     if "vcpu" in event.properties:
  78         # already checked on the generic format code
  79         cond = "true"
  80     else:
  81         cond = "trace_event_get_state(%s)" % event_id
  82
  83     out('',
  84         '    if (!%(cond)s) {',
  85         '        return;',
  86         '    }',
  87         '',
  88         '    if (trace_record_start(&rec, %(event_obj)s.id, %(size_str)s)) {',
  89         '        return; /* Trace Buffer Full, Event Dropped ! */',
  90         '    }',
  91         cond=cond,
  92         event_obj=event.api(event.QEMU_EVENT),
  93         size_str=sizestr)
  94
  95     if len(event.args) > 0:
  96         for type_, name in event.args:
  97             # string
  98             if is_string(type_):
  99                 out('    trace_record_write_str(&rec, %(name)s, arg%(name)s_len);',
 100                     name=name)
 101             # pointer var (not string)
 102             elif type_.endswith('*'):
 103                 out('    trace_record_write_u64(&rec, (uintptr_t)(uint64_t *)%(name)s);',
 104                     name=name)
 105             # primitive data type
 106             else:
 107                 out('    trace_record_write_u64(&rec, (uint64_t)%(name)s);',
 108                    name=name)
 109
 110     out('    trace_record_finish(&rec);',
 111         '}',
 112         '')