summaryrefslogtreecommitdiff
path: root/scripts/tracetool
blob: 743d2462893c8626bd4b72f4e6bd87544dab61cd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
#!/bin/sh
#
# Code generator for trace events
#
# Copyright IBM, Corp. 2010
#
# This work is licensed under the terms of the GNU GPL, version 2.  See
# the COPYING file in the top-level directory.

# Disable pathname expansion, makes processing text with '*' characters simpler
set -f

usage()
{
    cat >&2 <<EOF
usage: $0 [--nop | --simple | --stderr | --ust | --dtrace] [-h | -c]
Generate tracing code for a file on stdin.

Backends:
  --nop     Tracing disabled
  --simple  Simple built-in backend
  --stderr  Stderr built-in backend
  --ust     LTTng User Space Tracing backend
  --dtrace  DTrace/SystemTAP backend

Output formats:
  -h     Generate .h file
  -c     Generate .c file
  -d     Generate .d file (DTrace only)
  --stap Generate .stp file (DTrace with SystemTAP only)

Options:
  --binary       [path]    Full path to QEMU binary
  --target-arch  [arch]    QEMU emulator target arch
  --target-type  [type]    QEMU emulator target type ('system' or 'user')
  --probe-prefix [prefix]  Prefix for dtrace probe names
                           (default: qemu-\$targettype-\$targetarch)

EOF
    exit 1
}

# Get the name of a trace event
get_name()
{
    local name
    name=${1%%\(*}
    echo "${name##* }"
}

# Get the given property of a trace event
# 1: trace-events line
# 2: property name
# -> return 0 if property is present, or 1 otherwise
has_property()
{
    local props prop
    props=${1%%\(*}
    props=${props% *}
    for prop in $props; do
        if [ "$prop" = "$2" ]; then
            return 0
        fi
    done
    return 1
}

# Get the argument list of a trace event, including types and names
get_args()
{
    local args
    args=${1#*\(}
    args=${args%%\)*}
    echo "$args"
}

# Get the argument name list of a trace event
get_argnames()
{
    local nfields field name sep
    nfields=0
    sep="$2"
    for field in $(get_args "$1"); do
        nfields=$((nfields + 1))

        # Drop pointer star
        field=${field#\*}

        # Only argument names have commas at the end
        name=${field%,}
        test "$field" = "$name" && continue

        printf "%s%s " $name $sep
    done

    # Last argument name
    if [ "$nfields" -gt 1 ]
    then
        printf "%s" "$name"
    fi
}

# Get the number of arguments to a trace event
get_argc()
{
    local name argc
    argc=0
    for name in $(get_argnames "$1", ","); do
        argc=$((argc + 1))
    done
    echo $argc
}

# Get the format string for a trace event
get_fmt()
{
    local fmt
    fmt=${1#*\"}
    fmt=${fmt%\"*}
    echo "$fmt"
}

linetoh_begin_nop()
{
    return
}

linetoh_nop()
{
    local name args
    name=$(get_name "$1")
    args=$(get_args "$1")

    # Define an empty function for the trace event
    cat <<EOF
static inline void trace_$name($args)
{
}
EOF
}

linetoh_end_nop()
{
    return
}

linetoc_begin_nop()
{
    return
}

linetoc_nop()
{
    # No need for function definitions in nop backend
    return
}

linetoc_end_nop()
{
    return
}

linetoh_begin_simple()
{
    cat <<EOF
#include "trace/simple.h"
EOF

    simple_event_num=0
}

cast_args_to_uint64_t()
{
    local arg
    for arg in $(get_argnames "$1", ","); do
        printf "%s" "(uint64_t)(uintptr_t)$arg"
    done
}

linetoh_simple()
{
    local name args argc trace_args
    name=$(get_name "$1")
    args=$(get_args "$1")
    argc=$(get_argc "$1")

    trace_args="$simple_event_num"
    if [ "$argc" -gt 0 ]
    then
        trace_args="$trace_args, $(cast_args_to_uint64_t "$1")"
    fi

    cat <<EOF
static inline void trace_$name($args)
{
    trace$argc($trace_args);
}
EOF

    simple_event_num=$((simple_event_num + 1))
}

linetoh_end_simple()
{
    cat <<EOF
#define NR_TRACE_EVENTS $simple_event_num
extern TraceEvent trace_list[NR_TRACE_EVENTS];
EOF
}

linetoc_begin_simple()
{
    cat <<EOF
#include "trace.h"

TraceEvent trace_list[] = {
EOF
    simple_event_num=0

}

linetoc_simple()
{
    local name
    name=$(get_name "$1")
    cat <<EOF
{.tp_name = "$name", .state=0},
EOF
    simple_event_num=$((simple_event_num + 1))
}

linetoc_end_simple()
{
    cat <<EOF
};
EOF
}

#STDERR
linetoh_begin_stderr()
{
    cat <<EOF
#include <stdio.h>
#include "trace/stderr.h"

extern TraceEvent trace_list[];
EOF

    stderr_event_num=0
}

linetoh_stderr()
{
    local name args argnames argc fmt
    name=$(get_name "$1")
    args=$(get_args "$1")
    argnames=$(get_argnames "$1" ",")
    argc=$(get_argc "$1")
    fmt=$(get_fmt "$1")

    if [ "$argc" -gt 0 ]; then
        argnames=", $argnames"
    fi

    cat <<EOF
static inline void trace_$name($args)
{
    if (trace_list[$stderr_event_num].state != 0) {
        fprintf(stderr, "$name $fmt\n" $argnames);
    }
}
EOF
    stderr_event_num=$((stderr_event_num + 1))

}

linetoh_end_stderr()
{
    cat <<EOF
#define NR_TRACE_EVENTS $stderr_event_num
EOF
}

linetoc_begin_stderr()
{
    cat <<EOF
#include "trace.h"

TraceEvent trace_list[] = {
EOF
    stderr_event_num=0
}

linetoc_stderr()
{
    local name
    name=$(get_name "$1")
    cat <<EOF
{.tp_name = "$name", .state=0},
EOF
    stderr_event_num=$(($stderr_event_num + 1))
}

linetoc_end_stderr()
{
    cat <<EOF
};
EOF
}
#END OF STDERR

# Clean up after UST headers which pollute the namespace
ust_clean_namespace() {
    cat <<EOF
#undef mutex_lock
#undef mutex_unlock
#undef inline
#undef wmb
EOF
}

linetoh_begin_ust()
{
    echo "#include <ust/tracepoint.h>"
    ust_clean_namespace
}

linetoh_ust()
{
    local name args argnames
    name=$(get_name "$1")
    args=$(get_args "$1")
    argnames=$(get_argnames "$1", ",")

    cat <<EOF
DECLARE_TRACE(ust_$name, TP_PROTO($args), TP_ARGS($argnames));
#define trace_$name trace_ust_$name
EOF
}

linetoh_end_ust()
{
    return
}

linetoc_begin_ust()
{
    cat <<EOF
#include <ust/marker.h>
$(ust_clean_namespace)
#include "trace.h"
EOF
}

linetoc_ust()
{
    local name args argnames fmt
    name=$(get_name "$1")
    args=$(get_args "$1")
    argnames=$(get_argnames "$1", ",")
    [ -z "$argnames" ] || argnames=", $argnames"
    fmt=$(get_fmt "$1")

    cat <<EOF
DEFINE_TRACE(ust_$name);

static void ust_${name}_probe($args)
{
    trace_mark(ust, $name, "$fmt"$argnames);
}
EOF

    # Collect names for later
    names="$names $name"
}

linetoc_end_ust()
{
    cat <<EOF
static void __attribute__((constructor)) trace_init(void)
{
EOF

    for name in $names; do
        cat <<EOF
    register_trace_ust_$name(ust_${name}_probe);
EOF
    done

    echo "}"
}

linetoh_begin_dtrace()
{
    cat <<EOF
#include "trace-dtrace.h"
EOF
}

linetoh_dtrace()
{
    local name args argnames nameupper
    name=$(get_name "$1")
    args=$(get_args "$1")
    argnames=$(get_argnames "$1", ",")

    nameupper=`echo $name | tr '[:lower:]' '[:upper:]'`

    # Define an empty function for the trace event
    cat <<EOF
static inline void trace_$name($args) {
    if (QEMU_${nameupper}_ENABLED()) {
        QEMU_${nameupper}($argnames);
    }
}
EOF
}

linetoh_end_dtrace()
{
    return
}

linetoc_begin_dtrace()
{
    return
}

linetoc_dtrace()
{
    # No need for function definitions in dtrace backend
    return
}

linetoc_end_dtrace()
{
    return
}

linetod_begin_dtrace()
{
    cat <<EOF
provider qemu {
EOF
}

linetod_dtrace()
{
    local name args
    name=$(get_name "$1")
    args=$(get_args "$1")

    # DTrace provider syntax expects foo() for empty
    # params, not foo(void)
    if [ "$args" = "void" ]; then
       args=""
    fi

    # Define prototype for probe arguments
    cat <<EOF
        probe $name($args);
EOF
}

linetod_end_dtrace()
{
    cat <<EOF
};
EOF
}

linetostap_begin_dtrace()
{
    return
}

linetostap_dtrace()
{
    local i arg name args arglist
    name=$(get_name "$1")
    args=$(get_args "$1")
    arglist=$(get_argnames "$1", "")

    # Define prototype for probe arguments
    cat <<EOF
probe $probeprefix.$name = process("$binary").mark("$name")
{
EOF

    i=1
    for arg in $arglist
    do
        # 'limit' is a reserved keyword
        if [ "$arg" = "limit" ]; then
          arg="_limit"
        fi
        cat <<EOF
  $arg = \$arg$i;
EOF
        i="$((i+1))"
    done

    cat <<EOF
}
EOF
}

linetostap_end_dtrace()
{
    return
}

# Process stdin by calling begin, line, and end functions for the backend
convert()
{
    local begin process_line end str disable
    begin="lineto$1_begin_$backend"
    process_line="lineto$1_$backend"
    end="lineto$1_end_$backend"

    "$begin"

    while read -r str; do
        # Skip comments and empty lines
        test -z "${str%%#*}" && continue

        echo
        # Process the line.  The nop backend handles disabled lines.
        if has_property "$str" "disable"; then
            "lineto$1_nop" "$str"
        else
            "$process_line" "$str"
        fi
    done

    echo
    "$end"
}

tracetoh()
{
    cat <<EOF
#ifndef TRACE_H
#define TRACE_H

/* This file is autogenerated by tracetool, do not edit. */

#include "qemu-common.h"
EOF
    convert h
    echo "#endif /* TRACE_H */"
}

tracetoc()
{
    echo "/* This file is autogenerated by tracetool, do not edit. */"
    convert c
}

tracetod()
{
    if [ $backend != "dtrace" ]; then
       echo "DTrace probe generator not applicable to $backend backend"
       exit 1
    fi
    echo "/* This file is autogenerated by tracetool, do not edit. */"
    convert d
}

tracetostap()
{
    if [ $backend != "dtrace" ]; then
       echo "SystemTAP tapset generator not applicable to $backend backend"
       exit 1
    fi
    if [ -z "$binary" ]; then
       echo "--binary is required for SystemTAP tapset generator"
       exit 1
    fi
    if [ -z "$probeprefix" -a -z "$targettype" ]; then
       echo "--target-type is required for SystemTAP tapset generator"
       exit 1
    fi
    if [ -z "$probeprefix" -a -z "$targetarch" ]; then
       echo "--target-arch is required for SystemTAP tapset generator"
       exit 1
    fi
    if [ -z "$probeprefix" ]; then
        probeprefix="qemu.$targettype.$targetarch";
    fi
    echo "/* This file is autogenerated by tracetool, do not edit. */"
    convert stap
}


backend=
output=
binary=
targettype=
targetarch=
probeprefix=


until [ -z "$1" ]
do
  case "$1" in
    "--nop" | "--simple" | "--stderr" | "--ust" | "--dtrace") backend="${1#--}" ;;

    "--binary") shift ; binary="$1" ;;
    "--target-arch") shift ; targetarch="$1" ;;
    "--target-type") shift ; targettype="$1" ;;
    "--probe-prefix") shift ; probeprefix="$1" ;;

    "-h" | "-c" | "-d") output="${1#-}" ;;
    "--stap") output="${1#--}" ;;

    "--check-backend") exit 0 ;; # used by ./configure to test for backend

    "--list-backends") # used by ./configure to list available backends
          echo "nop simple stderr ust dtrace"
          exit 0
          ;;

    *)
      usage;;
  esac
  shift
done

if [ "$backend" = "" -o "$output" = "" ]; then
  usage
fi

gen="traceto$output"
"$gen"

exit 0