Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#include "event.h"
2#include "symbol.h"
3#include <stdlib.h>
4#include <string.h>
5#include <stdio.h>
6
7static inline int is_anon_memory(const char *filename)
8{
9 return strcmp(filename, "//anon") == 0;
10}
11
12static int strcommon(const char *pathname, char *cwd, int cwdlen)
13{
14 int n = 0;
15
16 while (n < cwdlen && pathname[n] == cwd[n])
17 ++n;
18
19 return n;
20}
21
22 struct map *map__new(struct mmap_event *event, char *cwd, int cwdlen)
23{
24 struct map *self = malloc(sizeof(*self));
25
26 if (self != NULL) {
27 const char *filename = event->filename;
28 char newfilename[PATH_MAX];
29 int anon;
30
31 if (cwd) {
32 int n = strcommon(filename, cwd, cwdlen);
33
34 if (n == cwdlen) {
35 snprintf(newfilename, sizeof(newfilename),
36 ".%s", filename + n);
37 filename = newfilename;
38 }
39 }
40
41 anon = is_anon_memory(filename);
42
43 if (anon) {
44 snprintf(newfilename, sizeof(newfilename), "/tmp/perf-%d.map", event->pid);
45 filename = newfilename;
46 }
47
48 self->start = event->start;
49 self->end = event->start + event->len;
50 self->pgoff = event->pgoff;
51
52 self->dso = dsos__findnew(filename);
53 if (self->dso == NULL)
54 goto out_delete;
55
56 if (self->dso == vdso || anon)
57 self->map_ip = vdso__map_ip;
58 else
59 self->map_ip = map__map_ip;
60 }
61 return self;
62out_delete:
63 free(self);
64 return NULL;
65}
66
67struct map *map__clone(struct map *self)
68{
69 struct map *map = malloc(sizeof(*self));
70
71 if (!map)
72 return NULL;
73
74 memcpy(map, self, sizeof(*self));
75
76 return map;
77}
78
79int map__overlap(struct map *l, struct map *r)
80{
81 if (l->start > r->start) {
82 struct map *t = l;
83 l = r;
84 r = t;
85 }
86
87 if (l->end > r->start)
88 return 1;
89
90 return 0;
91}
92
93size_t map__fprintf(struct map *self, FILE *fp)
94{
95 return fprintf(fp, " %Lx-%Lx %Lx %s\n",
96 self->start, self->end, self->pgoff, self->dso->name);
97}