aboutsummaryrefslogtreecommitdiff
path: root/tracetool
blob: 19b1659bc0980211d8f3ff9b8656f6076bc17905 (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
#!/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] [-h | -c]
Generate tracing code for a file on stdin.

Backends:
  --nop     Tracing disabled
  --simple  Simple built-in backend

Output formats:
  -h    Generate .h file
  -c    Generate .c file
EOF
    exit 1
}

# Get the name of a trace event
get_name()
{
    echo ${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
    nfields=0
    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" "$name, "
    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 "simpletrace.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()
{
    return
}

linetoc_begin_simple()
{
    return
}

linetoc_simple()
{
    return
}

linetoc_end_simple()
{
    return
}

# Process stdin by calling begin, line, and end functions for the backend
convert()
{
    local begin process_line end
    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
        str=${str%%#*}
        test -z "$str" && continue

        echo
        "$process_line" "$str"
    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
}

# Choose backend
case "$1" in
"--nop" | "--simple") backend="${1#--}" ;;
*) usage ;;
esac
shift

case "$1" in
"-h") tracetoh ;;
"-c") tracetoc ;;
"--check-backend") exit 0 ;; # used by ./configure to test for backend
*) usage ;;
esac

exit 0