tracetool

   1 #!/bin/sh
   2 #
   3 # Code generator for trace events
   4 #
   5 # Copyright IBM, Corp. 2010
   6 #
   7 # This work is licensed under the terms of the GNU GPL, version 2.  See
   8 # the COPYING file in the top-level directory.
   9
  10 # Disable pathname expansion, makes processing text with '*' characters simpler
  11 set -f
  12
  13 usage()
  14 {
  15     cat >&2 <<EOF
  16 usage: $0 [--nop | --simple] [-h | -c]
  17 Generate tracing code for a file on stdin.
  18
  19 Backends:
  20   --nop     Tracing disabled
  21   --simple  Simple built-in backend
  22
  23 Output formats:
  24   -h    Generate .h file
  25   -c    Generate .c file
  26 EOF
  27     exit 1
  28 }
  29
  30 # Get the name of a trace event
  31 get_name()
  32 {
  33     echo ${1%%\(*}
  34 }
  35
  36 # Get the argument list of a trace event, including types and names
  37 get_args()
  38 {
  39     local args
  40     args=${1#*\(}
  41     args=${args%)*}
  42     echo "$args"
  43 }
  44
  45 # Get the argument name list of a trace event
  46 get_argnames()
  47 {
  48     local nfields field name
  49     nfields=0
  50     for field in $(get_args "$1"); do
  51         nfields=$((nfields + 1))
  52
  53         # Drop pointer star
  54         field=${field#\*}
  55
  56         # Only argument names have commas at the end
  57         name=${field%,}
  58         test "$field" = "$name" && continue
  59
  60         printf "%s" "$name, "
  61     done
  62
  63     # Last argument name
  64     if [ "$nfields" -gt 1 ]
  65     then
  66         printf "%s" "$name"
  67     fi
  68 }
  69
  70 # Get the number of arguments to a trace event
  71 get_argc()
  72 {
  73     local name argc
  74     argc=0
  75     for name in $(get_argnames "$1"); do
  76         argc=$((argc + 1))
  77     done
  78     echo $argc
  79 }
  80
  81 # Get the format string for a trace event
  82 get_fmt()
  83 {
  84     local fmt
  85     fmt=${1#*\"}
  86     fmt=${fmt%\"*}
  87     echo "$fmt"
  88 }
  89
  90 linetoh_begin_nop()
  91 {
  92     return
  93 }
  94
  95 linetoh_nop()
  96 {
  97     local name args
  98     name=$(get_name "$1")
  99     args=$(get_args "$1")
 100
 101     # Define an empty function for the trace event
 102     cat <<EOF
 103 static inline void trace_$name($args)
 104 {
 105 }
 106 EOF
 107 }
 108
 109 linetoh_end_nop()
 110 {
 111     return
 112 }
 113
 114 linetoc_begin_nop()
 115 {
 116     return
 117 }
 118
 119 linetoc_nop()
 120 {
 121     # No need for function definitions in nop backend
 122     return
 123 }
 124
 125 linetoc_end_nop()
 126 {
 127     return
 128 }
 129
 130 linetoh_begin_simple()
 131 {
 132     cat <<EOF
 133 #include "simpletrace.h"
 134 EOF
 135
 136     simple_event_num=0
 137 }
 138
 139 cast_args_to_uint64_t()
 140 {
 141     local arg
 142     for arg in $(get_argnames "$1"); do
 143         printf "%s" "(uint64_t)(uintptr_t)$arg"
 144     done
 145 }
 146
 147 linetoh_simple()
 148 {
 149     local name args argc trace_args
 150     name=$(get_name "$1")
 151     args=$(get_args "$1")
 152     argc=$(get_argc "$1")
 153
 154     trace_args="$simple_event_num"
 155     if [ "$argc" -gt 0 ]
 156     then
 157         trace_args="$trace_args, $(cast_args_to_uint64_t "$1")"
 158     fi
 159
 160     cat <<EOF
 161 static inline void trace_$name($args)
 162 {
 163     trace$argc($trace_args);
 164 }
 165 EOF
 166
 167     simple_event_num=$((simple_event_num + 1))
 168 }
 169
 170 linetoh_end_simple()
 171 {
 172     cat <<EOF
 173 #define NR_TRACE_EVENTS $simple_event_num
 174 extern TraceEvent trace_list[NR_TRACE_EVENTS];
 175 EOF
 176 }
 177
 178 linetoc_begin_simple()
 179 {
 180     cat <<EOF
 181 #include "trace.h"
 182
 183 TraceEvent trace_list[] = {
 184 EOF
 185     simple_event_num=0
 186
 187 }
 188
 189 linetoc_simple()
 190 {
 191     local name
 192     name=$(get_name "$1")
 193     cat <<EOF
 194 {.tp_name = "$name", .state=0},
 195 EOF
 196     simple_event_num=$((simple_event_num + 1))
 197 }
 198
 199 linetoc_end_simple()
 200 {
 201     cat <<EOF
 202 };
 203 EOF
 204 }
 205
 206 # Process stdin by calling begin, line, and end functions for the backend
 207 convert()
 208 {
 209     local begin process_line end
 210     begin="lineto$1_begin_$backend"
 211     process_line="lineto$1_$backend"
 212     end="lineto$1_end_$backend"
 213
 214     "$begin"
 215
 216     while read -r str; do
 217         # Skip comments and empty lines
 218         str=${str%%#*}
 219         test -z "$str" && continue
 220
 221         echo
 222         "$process_line" "$str"
 223     done
 224
 225     echo
 226     "$end"
 227 }
 228
 229 tracetoh()
 230 {
 231     cat <<EOF
 232 #ifndef TRACE_H
 233 #define TRACE_H
 234
 235 /* This file is autogenerated by tracetool, do not edit. */
 236
 237 #include "qemu-common.h"
 238 EOF
 239     convert h
 240     echo "#endif /* TRACE_H */"
 241 }
 242
 243 tracetoc()
 244 {
 245     echo "/* This file is autogenerated by tracetool, do not edit. */"
 246     convert c
 247 }
 248
 249 # Choose backend
 250 case "$1" in
 251 "--nop" | "--simple") backend="${1#--}" ;;
 252 *) usage ;;
 253 esac
 254 shift
 255
 256 case "$1" in
 257 "-h") tracetoh ;;
 258 "-c") tracetoc ;;
 259 "--check-backend") exit 0 ;; # used by ./configure to test for backend
 260 *) usage ;;
 261 esac
 262
 263 exit 0