aboutsummaryrefslogtreecommitdiff
path: root/qapi/string-output-visitor.c
blob: c6f01f9f9cdc8c49e66d2b90d25088cae91f01d6 (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
/*
 * String printing Visitor
 *
 * Copyright Red Hat, Inc. 2012-2016
 *
 * Author: Paolo Bonzini <pbonzini@redhat.com>
 *
 * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
 * See the COPYING.LIB file in the top-level directory.
 *
 */

#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qapi/string-output-visitor.h"
#include "qapi/visitor-impl.h"
#include "qemu/host-utils.h"
#include <math.h>
#include "qemu/range.h"

enum ListMode {
    LM_NONE,             /* not traversing a list of repeated options */
    LM_STARTED,          /* next_list() ready to be called */

    LM_IN_PROGRESS,      /* next_list() has been called.
                          *
                          * Generating the next list link will consume the most
                          * recently parsed QemuOpt instance of the repeated
                          * option.
                          *
                          * Parsing a value into the list link will examine the
                          * next QemuOpt instance of the repeated option, and
                          * possibly enter LM_SIGNED_INTERVAL or
                          * LM_UNSIGNED_INTERVAL.
                          */

    LM_SIGNED_INTERVAL,  /* next_list() has been called.
                          *
                          * Generating the next list link will consume the most
                          * recently stored element from the signed interval,
                          * parsed from the most recent QemuOpt instance of the
                          * repeated option. This may consume QemuOpt itself
                          * and return to LM_IN_PROGRESS.
                          *
                          * Parsing a value into the list link will store the
                          * next element of the signed interval.
                          */

    LM_UNSIGNED_INTERVAL,/* Same as above, only for an unsigned interval. */

    LM_END,              /* next_list() called, about to see last element. */
};

typedef enum ListMode ListMode;

struct StringOutputVisitor
{
    Visitor visitor;
    bool human;
    GString *string;
    ListMode list_mode;
    union {
        int64_t s;
        uint64_t u;
    } range_start, range_end;
    GList *ranges;
};

static StringOutputVisitor *to_sov(Visitor *v)
{
    return container_of(v, StringOutputVisitor, visitor);
}

static void string_output_set(StringOutputVisitor *sov, char *string)
{
    if (sov->string) {
        g_string_free(sov->string, true);
    }
    sov->string = g_string_new(string);
    g_free(string);
}

static void string_output_append(StringOutputVisitor *sov, int64_t a)
{
    Range *r = g_malloc0(sizeof(*r));

    range_set_bounds(r, a, a);
    sov->ranges = range_list_insert(sov->ranges, r);
}

static void string_output_append_range(StringOutputVisitor *sov,
                                       int64_t s, int64_t e)
{
    Range *r = g_malloc0(sizeof(*r));

    range_set_bounds(r, s, e);
    sov->ranges = range_list_insert(sov->ranges, r);
}

static void format_string(StringOutputVisitor *sov, Range *r, bool next,
                          bool human)
{
    if (range_lob(r) != range_upb(r)) {
        if (human) {
            g_string_append_printf(sov->string, "0x%" PRIx64 "-0x%" PRIx64,
                                   range_lob(r), range_upb(r));

        } else {
            g_string_append_printf(sov->string, "%" PRId64 "-%" PRId64,
                                   range_lob(r), range_upb(r));
        }
    } else {
        if (human) {
            g_string_append_printf(sov->string, "0x%" PRIx64, range_lob(r));
        } else {
            g_string_append_printf(sov->string, "%" PRId64, range_lob(r));
        }
    }
    if (next) {
        g_string_append(sov->string, ",");
    }
}

static void print_type_int64(Visitor *v, const char *name, int64_t *obj,
                             Error **errp)
{
    StringOutputVisitor *sov = to_sov(v);
    GList *l;

    switch (sov->list_mode) {
    case LM_NONE:
        string_output_append(sov, *obj);
        break;

    case LM_STARTED:
        sov->range_start.s = *obj;
        sov->range_end.s = *obj;
        sov->list_mode = LM_IN_PROGRESS;
        return;

    case LM_IN_PROGRESS:
        if (sov->range_end.s + 1 == *obj) {
            sov->range_end.s++;
        } else {
            if (sov->range_start.s == sov->range_end.s) {
                string_output_append(sov, sov->range_end.s);
            } else {
                assert(sov->range_start.s < sov->range_end.s);
                string_output_append_range(sov, sov->range_start.s,
                                           sov->range_end.s);
            }

            sov->range_start.s = *obj;
            sov->range_end.s = *obj;
        }
        return;

    case LM_END:
        if (sov->range_end.s + 1 == *obj) {
            sov->range_end.s++;
            assert(sov->range_start.s < sov->range_end.s);
            string_output_append_range(sov, sov->range_start.s,
                                       sov->range_end.s);
        } else {
            if (sov->range_start.s == sov->range_end.s) {
                string_output_append(sov, sov->range_end.s);
            } else {
                assert(sov->range_start.s < sov->range_end.s);

                string_output_append_range(sov, sov->range_start.s,
                                           sov->range_end.s);
            }
            string_output_append(sov, *obj);
        }
        break;

    default:
        abort();
    }

    l = sov->ranges;
    while (l) {
        Range *r = l->data;
        format_string(sov, r, l->next != NULL, false);
        l = l->next;
    }

    if (sov->human) {
        l = sov->ranges;
        g_string_append(sov->string, " (");
        while (l) {
            Range *r = l->data;
            format_string(sov, r, l->next != NULL, true);
            l = l->next;
        }
        g_string_append(sov->string, ")");
    }
}

static void print_type_uint64(Visitor *v, const char *name, uint64_t *obj,
                             Error **errp)
{
    /* FIXME: print_type_int64 mishandles values over INT64_MAX */
    int64_t i = *obj;
    print_type_int64(v, name, &i, errp);
}

static void print_type_size(Visitor *v, const char *name, uint64_t *obj,
                            Error **errp)
{
    StringOutputVisitor *sov = to_sov(v);
    static const char suffixes[] = { 'B', 'K', 'M', 'G', 'T', 'P', 'E' };
    uint64_t div, val;
    char *out;
    int i;

    if (!sov->human) {
        out = g_strdup_printf("%"PRIu64, *obj);
        string_output_set(sov, out);
        return;
    }

    val = *obj;

    /* The exponent (returned in i) minus one gives us
     * floor(log2(val * 1024 / 1000).  The correction makes us
     * switch to the higher power when the integer part is >= 1000.
     */
    frexp(val / (1000.0 / 1024.0), &i);
    i = (i - 1) / 10;
    assert(i < ARRAY_SIZE(suffixes));
    div = 1ULL << (i * 10);

    out = g_strdup_printf("%"PRIu64" (%0.3g %c%s)", val,
                          (double)val/div, suffixes[i], i ? "iB" : "");
    string_output_set(sov, out);
}

static void print_type_bool(Visitor *v, const char *name, bool *obj,
                            Error **errp)
{
    StringOutputVisitor *sov = to_sov(v);
    string_output_set(sov, g_strdup(*obj ? "true" : "false"));
}

static void print_type_str(Visitor *v, const char *name, char **obj,
                           Error **errp)
{
    StringOutputVisitor *sov = to_sov(v);
    char *out;

    if (sov->human) {
        out = *obj ? g_strdup_printf("\"%s\"", *obj) : g_strdup("<null>");
    } else {
        out = g_strdup(*obj ? *obj : "");
    }
    string_output_set(sov, out);
}

static void print_type_number(Visitor *v, const char *name, double *obj,
                              Error **errp)
{
    StringOutputVisitor *sov = to_sov(v);
    string_output_set(sov, g_strdup_printf("%f", *obj));
}

static void
start_list(Visitor *v, const char *name, GenericList **list, size_t size,
           Error **errp)
{
    StringOutputVisitor *sov = to_sov(v);

    /* we can't traverse a list in a list */
    assert(sov->list_mode == LM_NONE);
    /* We don't support visits without a list */
    assert(list);
    /* List handling is only needed if there are at least two elements */
    if (*list && (*list)->next) {
        sov->list_mode = LM_STARTED;
    }
}

static GenericList *next_list(Visitor *v, GenericList *tail, size_t size)
{
    StringOutputVisitor *sov = to_sov(v);
    GenericList *ret = tail->next;

    if (ret && !ret->next) {
        sov->list_mode = LM_END;
    }
    return ret;
}

static void end_list(Visitor *v)
{
    StringOutputVisitor *sov = to_sov(v);

    assert(sov->list_mode == LM_STARTED ||
           sov->list_mode == LM_END ||
           sov->list_mode == LM_NONE ||
           sov->list_mode == LM_IN_PROGRESS);
    sov->list_mode = LM_NONE;
}

char *string_output_get_string(StringOutputVisitor *sov)
{
    char *string = g_string_free(sov->string, false);
    sov->string = NULL;
    return string;
}

Visitor *string_output_get_visitor(StringOutputVisitor *sov)
{
    return &sov->visitor;
}

static void free_range(void *range, void *dummy)
{
    g_free(range);
}

void string_output_visitor_cleanup(StringOutputVisitor *sov)
{
    if (sov->string) {
        g_string_free(sov->string, true);
    }

    g_list_foreach(sov->ranges, free_range, NULL);
    g_list_free(sov->ranges);
    g_free(sov);
}

StringOutputVisitor *string_output_visitor_new(bool human)
{
    StringOutputVisitor *v;

    v = g_malloc0(sizeof(*v));

    v->string = g_string_new(NULL);
    v->human = human;
    v->visitor.type = VISITOR_OUTPUT;
    v->visitor.type_int64 = print_type_int64;
    v->visitor.type_uint64 = print_type_uint64;
    v->visitor.type_size = print_type_size;
    v->visitor.type_bool = print_type_bool;
    v->visitor.type_str = print_type_str;
    v->visitor.type_number = print_type_number;
    v->visitor.start_list = start_list;
    v->visitor.next_list = next_list;
    v->visitor.end_list = end_list;

    return v;
}