Root/tools/perf/util/map.c

1#include "event.h"
2#include "symbol.h"
3#include <stdlib.h>
4#include <string.h>
5#include <stdio.h>
6#include "debug.h"
7
8const char *map_type__name[MAP__NR_TYPES] = {
9    [MAP__FUNCTION] = "Functions",
10    [MAP__VARIABLE] = "Variables",
11};
12
13static inline int is_anon_memory(const char *filename)
14{
15    return strcmp(filename, "//anon") == 0;
16}
17
18static int strcommon(const char *pathname, char *cwd, int cwdlen)
19{
20    int n = 0;
21
22    while (n < cwdlen && pathname[n] == cwd[n])
23        ++n;
24
25    return n;
26}
27
28void map__init(struct map *self, enum map_type type,
29           u64 start, u64 end, u64 pgoff, struct dso *dso)
30{
31    self->type = type;
32    self->start = start;
33    self->end = end;
34    self->pgoff = pgoff;
35    self->dso = dso;
36    self->map_ip = map__map_ip;
37    self->unmap_ip = map__unmap_ip;
38    RB_CLEAR_NODE(&self->rb_node);
39}
40
41struct map *map__new(struct mmap_event *event, enum map_type type,
42             char *cwd, int cwdlen)
43{
44    struct map *self = malloc(sizeof(*self));
45
46    if (self != NULL) {
47        const char *filename = event->filename;
48        char newfilename[PATH_MAX];
49        struct dso *dso;
50        int anon;
51
52        if (cwd) {
53            int n = strcommon(filename, cwd, cwdlen);
54
55            if (n == cwdlen) {
56                snprintf(newfilename, sizeof(newfilename),
57                     ".%s", filename + n);
58                filename = newfilename;
59            }
60        }
61
62        anon = is_anon_memory(filename);
63
64        if (anon) {
65            snprintf(newfilename, sizeof(newfilename), "/tmp/perf-%d.map", event->pid);
66            filename = newfilename;
67        }
68
69        dso = dsos__findnew(filename);
70        if (dso == NULL)
71            goto out_delete;
72
73        map__init(self, type, event->start, event->start + event->len,
74              event->pgoff, dso);
75
76        if (anon) {
77set_identity:
78            self->map_ip = self->unmap_ip = identity__map_ip;
79        } else if (strcmp(filename, "[vdso]") == 0) {
80            dso__set_loaded(dso, self->type);
81            goto set_identity;
82        }
83    }
84    return self;
85out_delete:
86    free(self);
87    return NULL;
88}
89
90void map__delete(struct map *self)
91{
92    free(self);
93}
94
95void map__fixup_start(struct map *self)
96{
97    struct rb_root *symbols = &self->dso->symbols[self->type];
98    struct rb_node *nd = rb_first(symbols);
99    if (nd != NULL) {
100        struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
101        self->start = sym->start;
102    }
103}
104
105void map__fixup_end(struct map *self)
106{
107    struct rb_root *symbols = &self->dso->symbols[self->type];
108    struct rb_node *nd = rb_last(symbols);
109    if (nd != NULL) {
110        struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
111        self->end = sym->end;
112    }
113}
114
115#define DSO__DELETED "(deleted)"
116
117int map__load(struct map *self, symbol_filter_t filter)
118{
119    const char *name = self->dso->long_name;
120    int nr;
121
122    if (dso__loaded(self->dso, self->type))
123        return 0;
124
125    nr = dso__load(self->dso, self, filter);
126    if (nr < 0) {
127        if (self->dso->has_build_id) {
128            char sbuild_id[BUILD_ID_SIZE * 2 + 1];
129
130            build_id__sprintf(self->dso->build_id,
131                      sizeof(self->dso->build_id),
132                      sbuild_id);
133            pr_warning("%s with build id %s not found",
134                   name, sbuild_id);
135        } else
136            pr_warning("Failed to open %s", name);
137
138        pr_warning(", continuing without symbols\n");
139        return -1;
140    } else if (nr == 0) {
141        const size_t len = strlen(name);
142        const size_t real_len = len - sizeof(DSO__DELETED);
143
144        if (len > sizeof(DSO__DELETED) &&
145            strcmp(name + real_len + 1, DSO__DELETED) == 0) {
146            pr_warning("%.*s was updated, restart the long "
147                   "running apps that use it!\n",
148                   (int)real_len, name);
149        } else {
150            pr_warning("no symbols found in %s, maybe install "
151                   "a debug package?\n", name);
152        }
153
154        return -1;
155    }
156    /*
157     * Only applies to the kernel, as its symtabs aren't relative like the
158     * module ones.
159     */
160    if (self->dso->kernel)
161        map__reloc_vmlinux(self);
162
163    return 0;
164}
165
166struct symbol *map__find_symbol(struct map *self, u64 addr,
167                symbol_filter_t filter)
168{
169    if (map__load(self, filter) < 0)
170        return NULL;
171
172    return dso__find_symbol(self->dso, self->type, addr);
173}
174
175struct symbol *map__find_symbol_by_name(struct map *self, const char *name,
176                    symbol_filter_t filter)
177{
178    if (map__load(self, filter) < 0)
179        return NULL;
180
181    if (!dso__sorted_by_name(self->dso, self->type))
182        dso__sort_by_name(self->dso, self->type);
183
184    return dso__find_symbol_by_name(self->dso, self->type, name);
185}
186
187struct map *map__clone(struct map *self)
188{
189    struct map *map = malloc(sizeof(*self));
190
191    if (!map)
192        return NULL;
193
194    memcpy(map, self, sizeof(*self));
195
196    return map;
197}
198
199int map__overlap(struct map *l, struct map *r)
200{
201    if (l->start > r->start) {
202        struct map *t = l;
203        l = r;
204        r = t;
205    }
206
207    if (l->end > r->start)
208        return 1;
209
210    return 0;
211}
212
213size_t map__fprintf(struct map *self, FILE *fp)
214{
215    return fprintf(fp, " %Lx-%Lx %Lx %s\n",
216               self->start, self->end, self->pgoff, self->dso->name);
217}
218
219/*
220 * objdump wants/reports absolute IPs for ET_EXEC, and RIPs for ET_DYN.
221 * map->dso->adjust_symbols==1 for ET_EXEC-like cases.
222 */
223u64 map__rip_2objdump(struct map *map, u64 rip)
224{
225    u64 addr = map->dso->adjust_symbols ?
226            map->unmap_ip(map, rip) : /* RIP -> IP */
227            rip;
228    return addr;
229}
230
231u64 map__objdump_2ip(struct map *map, u64 addr)
232{
233    u64 ip = map->dso->adjust_symbols ?
234            addr :
235            map->unmap_ip(map, addr); /* RIP -> IP */
236    return ip;
237}
238

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