scripts/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 | --stderr | --ust | --dtrace] [-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   --stderr  Stderr built-in backend
  23   --ust     LTTng User Space Tracing backend
  24   --dtrace  DTrace/SystemTAP backend
  25
  26 Output formats:
  27   -h     Generate .h file
  28   -c     Generate .c file
  29   -d     Generate .d file (DTrace only)
  30   --stap Generate .stp file (DTrace with SystemTAP only)
  31
  32 Options:
  33   --binary       [path]    Full path to QEMU binary
  34   --target-arch  [arch]    QEMU emulator target arch
  35   --target-type  [type]    QEMU emulator target type ('system' or 'user')
  36   --probe-prefix [prefix]  Prefix for dtrace probe names
  37                            (default: qemu-\$targettype-\$targetarch)
  38
  39 EOF
  40     exit 1
  41 }
  42
  43 # Print a line without interpreting backslash escapes
  44 #
  45 # The built-in echo command may interpret backslash escapes without an option
  46 # to disable this behavior.
  47 puts()
  48 {
  49     printf "%s\n" "$1"
  50 }
  51
  52 # Get the name of a trace event
  53 get_name()
  54 {
  55     local name
  56     name=${1%%\(*}
  57     echo "${name##* }"
  58 }
  59
  60 # Get the given property of a trace event
  61 # 1: trace-events line
  62 # 2: property name
  63 # -> return 0 if property is present, or 1 otherwise
  64 has_property()
  65 {
  66     local props prop
  67     props=${1%%\(*}
  68     props=${props% *}
  69     for prop in $props; do
  70         if [ "$prop" = "$2" ]; then
  71             return 0
  72         fi
  73     done
  74     return 1
  75 }
  76
  77 # Get the argument list of a trace event, including types and names
  78 get_args()
  79 {
  80     local args
  81     args=${1#*\(}
  82     args=${args%%\)*}
  83     echo "$args"
  84 }
  85
  86 # Get the argument name list of a trace event
  87 get_argnames()
  88 {
  89     local nfields field name sep
  90     nfields=0
  91     sep="$2"
  92     for field in $(get_args "$1"); do
  93         nfields=$((nfields + 1))
  94
  95         # Drop pointer star
  96         field=${field#\*}
  97
  98         # Only argument names have commas at the end
  99         name=${field%,}
 100         test "$field" = "$name" && continue
 101
 102         printf "%s%s " $name $sep
 103     done
 104
 105     # Last argument name
 106     if [ "$nfields" -gt 1 ]
 107     then
 108         printf "%s" "$name"
 109     fi
 110 }
 111
 112 # Get the number of arguments to a trace event
 113 get_argc()
 114 {
 115     local name argc
 116     argc=0
 117     for name in $(get_argnames "$1", ","); do
 118         argc=$((argc + 1))
 119     done
 120     echo $argc
 121 }
 122
 123 # Get the format string including double quotes for a trace event
 124 get_fmt()
 125 {
 126     puts "${1#*)}"
 127 }
 128
 129 linetoh_begin_nop()
 130 {
 131     return
 132 }
 133
 134 linetoh_nop()
 135 {
 136     local name args
 137     name=$(get_name "$1")
 138     args=$(get_args "$1")
 139
 140     # Define an empty function for the trace event
 141     cat <<EOF
 142 static inline void trace_$name($args)
 143 {
 144 }
 145 EOF
 146 }
 147
 148 linetoh_end_nop()
 149 {
 150     return
 151 }
 152
 153 linetoc_begin_nop()
 154 {
 155     return
 156 }
 157
 158 linetoc_nop()
 159 {
 160     # No need for function definitions in nop backend
 161     return
 162 }
 163
 164 linetoc_end_nop()
 165 {
 166     return
 167 }
 168
 169 linetoh_begin_simple()
 170 {
 171     cat <<EOF
 172 #include "trace/simple.h"
 173 EOF
 174
 175     simple_event_num=0
 176 }
 177
 178 cast_args_to_uint64_t()
 179 {
 180     local arg
 181     for arg in $(get_argnames "$1", ","); do
 182         printf "%s" "(uint64_t)(uintptr_t)$arg"
 183     done
 184 }
 185
 186 linetoh_simple()
 187 {
 188     local name args argc trace_args
 189     name=$(get_name "$1")
 190     args=$(get_args "$1")
 191     argc=$(get_argc "$1")
 192
 193     trace_args="$simple_event_num"
 194     if [ "$argc" -gt 0 ]
 195     then
 196         trace_args="$trace_args, $(cast_args_to_uint64_t "$1")"
 197     fi
 198
 199     cat <<EOF
 200 static inline void trace_$name($args)
 201 {
 202     trace$argc($trace_args);
 203 }
 204 EOF
 205
 206     simple_event_num=$((simple_event_num + 1))
 207 }
 208
 209 linetoh_end_simple()
 210 {
 211     cat <<EOF
 212 #define NR_TRACE_EVENTS $simple_event_num
 213 extern TraceEvent trace_list[NR_TRACE_EVENTS];
 214 EOF
 215 }
 216
 217 linetoc_begin_simple()
 218 {
 219     cat <<EOF
 220 #include "trace.h"
 221
 222 TraceEvent trace_list[] = {
 223 EOF
 224     simple_event_num=0
 225
 226 }
 227
 228 linetoc_simple()
 229 {
 230     local name
 231     name=$(get_name "$1")
 232     cat <<EOF
 233 {.tp_name = "$name", .state=0},
 234 EOF
 235     simple_event_num=$((simple_event_num + 1))
 236 }
 237
 238 linetoc_end_simple()
 239 {
 240     cat <<EOF
 241 };
 242 EOF
 243 }
 244
 245 #STDERR
 246 linetoh_begin_stderr()
 247 {
 248     cat <<EOF
 249 #include <stdio.h>
 250 #include "trace/stderr.h"
 251
 252 extern TraceEvent trace_list[];
 253 EOF
 254
 255     stderr_event_num=0
 256 }
 257
 258 linetoh_stderr()
 259 {
 260     local name args argnames argc fmt
 261     name=$(get_name "$1")
 262     args=$(get_args "$1")
 263     argnames=$(get_argnames "$1" ",")
 264     argc=$(get_argc "$1")
 265     fmt=$(get_fmt "$1")
 266
 267     if [ "$argc" -gt 0 ]; then
 268         argnames=", $argnames"
 269     fi
 270
 271     cat <<EOF
 272 static inline void trace_$name($args)
 273 {
 274     if (trace_list[$stderr_event_num].state != 0) {
 275         fprintf(stderr, "$name " $fmt "\n" $argnames);
 276     }
 277 }
 278 EOF
 279     stderr_event_num=$((stderr_event_num + 1))
 280
 281 }
 282
 283 linetoh_end_stderr()
 284 {
 285     cat <<EOF
 286 #define NR_TRACE_EVENTS $stderr_event_num
 287 EOF
 288 }
 289
 290 linetoc_begin_stderr()
 291 {
 292     cat <<EOF
 293 #include "trace.h"
 294
 295 TraceEvent trace_list[] = {
 296 EOF
 297     stderr_event_num=0
 298 }
 299
 300 linetoc_stderr()
 301 {
 302     local name
 303     name=$(get_name "$1")
 304     cat <<EOF
 305 {.tp_name = "$name", .state=0},
 306 EOF
 307     stderr_event_num=$(($stderr_event_num + 1))
 308 }
 309
 310 linetoc_end_stderr()
 311 {
 312     cat <<EOF
 313 };
 314 EOF
 315 }
 316 #END OF STDERR
 317
 318 # Clean up after UST headers which pollute the namespace
 319 ust_clean_namespace() {
 320     cat <<EOF
 321 #undef mutex_lock
 322 #undef mutex_unlock
 323 #undef inline
 324 #undef wmb
 325 EOF
 326 }
 327
 328 linetoh_begin_ust()
 329 {
 330     echo "#include <ust/tracepoint.h>"
 331     ust_clean_namespace
 332 }
 333
 334 linetoh_ust()
 335 {
 336     local name args argnames
 337     name=$(get_name "$1")
 338     args=$(get_args "$1")
 339     argnames=$(get_argnames "$1", ",")
 340
 341     cat <<EOF
 342 DECLARE_TRACE(ust_$name, TP_PROTO($args), TP_ARGS($argnames));
 343 #define trace_$name trace_ust_$name
 344 EOF
 345 }
 346
 347 linetoh_end_ust()
 348 {
 349     return
 350 }
 351
 352 linetoc_begin_ust()
 353 {
 354     cat <<EOF
 355 #include <ust/marker.h>
 356 $(ust_clean_namespace)
 357 #include "trace.h"
 358 EOF
 359 }
 360
 361 linetoc_ust()
 362 {
 363     local name args argnames fmt
 364     name=$(get_name "$1")
 365     args=$(get_args "$1")
 366     argnames=$(get_argnames "$1", ",")
 367     [ -z "$argnames" ] || argnames=", $argnames"
 368     fmt=$(get_fmt "$1")
 369
 370     cat <<EOF
 371 DEFINE_TRACE(ust_$name);
 372
 373 static void ust_${name}_probe($args)
 374 {
 375     trace_mark(ust, $name, $fmt$argnames);
 376 }
 377 EOF
 378
 379     # Collect names for later
 380     names="$names $name"
 381 }
 382
 383 linetoc_end_ust()
 384 {
 385     cat <<EOF
 386 static void __attribute__((constructor)) trace_init(void)
 387 {
 388 EOF
 389
 390     for name in $names; do
 391         cat <<EOF
 392     register_trace_ust_$name(ust_${name}_probe);
 393 EOF
 394     done
 395
 396     echo "}"
 397 }
 398
 399 linetoh_begin_dtrace()
 400 {
 401     cat <<EOF
 402 #include "trace-dtrace.h"
 403 EOF
 404 }
 405
 406 linetoh_dtrace()
 407 {
 408     local name args argnames nameupper
 409     name=$(get_name "$1")
 410     args=$(get_args "$1")
 411     argnames=$(get_argnames "$1", ",")
 412
 413     nameupper=`echo $name | tr '[:lower:]' '[:upper:]'`
 414
 415     # Define an empty function for the trace event
 416     cat <<EOF
 417 static inline void trace_$name($args) {
 418     if (QEMU_${nameupper}_ENABLED()) {
 419         QEMU_${nameupper}($argnames);
 420     }
 421 }
 422 EOF
 423 }
 424
 425 linetoh_end_dtrace()
 426 {
 427     return
 428 }
 429
 430 linetoc_begin_dtrace()
 431 {
 432     return
 433 }
 434
 435 linetoc_dtrace()
 436 {
 437     # No need for function definitions in dtrace backend
 438     return
 439 }
 440
 441 linetoc_end_dtrace()
 442 {
 443     return
 444 }
 445
 446 linetod_begin_dtrace()
 447 {
 448     cat <<EOF
 449 provider qemu {
 450 EOF
 451 }
 452
 453 linetod_dtrace()
 454 {
 455     local name args
 456     name=$(get_name "$1")
 457     args=$(get_args "$1")
 458
 459     # DTrace provider syntax expects foo() for empty
 460     # params, not foo(void)
 461     if [ "$args" = "void" ]; then
 462        args=""
 463     fi
 464
 465     # Define prototype for probe arguments
 466     cat <<EOF
 467         probe $name($args);
 468 EOF
 469 }
 470
 471 linetod_end_dtrace()
 472 {
 473     cat <<EOF
 474 };
 475 EOF
 476 }
 477
 478 linetostap_begin_dtrace()
 479 {
 480     return
 481 }
 482
 483 linetostap_dtrace()
 484 {
 485     local i arg name args arglist
 486     name=$(get_name "$1")
 487     args=$(get_args "$1")
 488     arglist=$(get_argnames "$1", "")
 489
 490     # Define prototype for probe arguments
 491     cat <<EOF
 492 probe $probeprefix.$name = process("$binary").mark("$name")
 493 {
 494 EOF
 495
 496     i=1
 497     for arg in $arglist
 498     do
 499         # 'limit' is a reserved keyword
 500         if [ "$arg" = "limit" ]; then
 501           arg="_limit"
 502         fi
 503         cat <<EOF
 504   $arg = \$arg$i;
 505 EOF
 506         i="$((i+1))"
 507     done
 508
 509     cat <<EOF
 510 }
 511 EOF
 512 }
 513
 514 linetostap_end_dtrace()
 515 {
 516     return
 517 }
 518
 519 # Process stdin by calling begin, line, and end functions for the backend
 520 convert()
 521 {
 522     local begin process_line end str disable
 523     begin="lineto$1_begin_$backend"
 524     process_line="lineto$1_$backend"
 525     end="lineto$1_end_$backend"
 526
 527     "$begin"
 528
 529     while read -r str; do
 530         # Skip comments and empty lines
 531         test -z "${str%%#*}" && continue
 532
 533         echo
 534         # Process the line.  The nop backend handles disabled lines.
 535         if has_property "$str" "disable"; then
 536             "lineto$1_nop" "$str"
 537         else
 538             "$process_line" "$str"
 539         fi
 540     done
 541
 542     echo
 543     "$end"
 544 }
 545
 546 tracetoh()
 547 {
 548     cat <<EOF
 549 #ifndef TRACE_H
 550 #define TRACE_H
 551
 552 /* This file is autogenerated by tracetool, do not edit. */
 553
 554 #include "qemu-common.h"
 555 EOF
 556     convert h
 557     echo "#endif /* TRACE_H */"
 558 }
 559
 560 tracetoc()
 561 {
 562     echo "/* This file is autogenerated by tracetool, do not edit. */"
 563     convert c
 564 }
 565
 566 tracetod()
 567 {
 568     if [ $backend != "dtrace" ]; then
 569        echo "DTrace probe generator not applicable to $backend backend"
 570        exit 1
 571     fi
 572     echo "/* This file is autogenerated by tracetool, do not edit. */"
 573     convert d
 574 }
 575
 576 tracetostap()
 577 {
 578     if [ $backend != "dtrace" ]; then
 579        echo "SystemTAP tapset generator not applicable to $backend backend"
 580        exit 1
 581     fi
 582     if [ -z "$binary" ]; then
 583        echo "--binary is required for SystemTAP tapset generator"
 584        exit 1
 585     fi
 586     if [ -z "$probeprefix" -a -z "$targettype" ]; then
 587        echo "--target-type is required for SystemTAP tapset generator"
 588        exit 1
 589     fi
 590     if [ -z "$probeprefix" -a -z "$targetarch" ]; then
 591        echo "--target-arch is required for SystemTAP tapset generator"
 592        exit 1
 593     fi
 594     if [ -z "$probeprefix" ]; then
 595         probeprefix="qemu.$targettype.$targetarch";
 596     fi
 597     echo "/* This file is autogenerated by tracetool, do not edit. */"
 598     convert stap
 599 }
 600
 601
 602 backend=
 603 output=
 604 binary=
 605 targettype=
 606 targetarch=
 607 probeprefix=
 608
 609
 610 until [ -z "$1" ]
 611 do
 612   case "$1" in
 613     "--nop" | "--simple" | "--stderr" | "--ust" | "--dtrace") backend="${1#--}" ;;
 614
 615     "--binary") shift ; binary="$1" ;;
 616     "--target-arch") shift ; targetarch="$1" ;;
 617     "--target-type") shift ; targettype="$1" ;;
 618     "--probe-prefix") shift ; probeprefix="$1" ;;
 619
 620     "-h" | "-c" | "-d") output="${1#-}" ;;
 621     "--stap") output="${1#--}" ;;
 622
 623     "--check-backend") exit 0 ;; # used by ./configure to test for backend
 624
 625     "--list-backends") # used by ./configure to list available backends
 626           echo "nop simple stderr ust dtrace"
 627           exit 0
 628           ;;
 629
 630     *)
 631       usage;;
 632   esac
 633   shift
 634 done
 635
 636 if [ "$backend" = "" -o "$output" = "" ]; then
 637   usage
 638 fi
 639
 640 gen="traceto$output"
 641 "$gen"
 642
 643 exit 0