linux_dsm_epyc7002/tools/perf/util/srccode.c
Arnaldo Carvalho de Melo fb71c86cc8 perf tools: Remove util.h from where it is not needed
Check that it is not needed and remove, fixing up some fallout for
places where it was only serving to get something else.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-9h6dg6lsqe2usyqjh5rrues4@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2019-09-20 09:19:20 -03:00

180 lines
3.5 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Manage printing of source lines
* Copyright (c) 2017, Intel Corporation.
* Author: Andi Kleen
*/
#include <linux/list.h>
#include <linux/zalloc.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <assert.h>
#include <string.h>
#include "srccode.h"
#include "debug.h"
#include "util.h" // page_size
#define MAXSRCCACHE (32*1024*1024)
#define MAXSRCFILES 64
#define SRC_HTAB_SZ 64
struct srcfile {
struct hlist_node hash_nd;
struct list_head nd;
char *fn;
char **lines;
char *map;
unsigned numlines;
size_t maplen;
};
static struct hlist_head srcfile_htab[SRC_HTAB_SZ];
static LIST_HEAD(srcfile_list);
static long map_total_sz;
static int num_srcfiles;
static unsigned shash(unsigned char *s)
{
unsigned h = 0;
while (*s)
h = 65599 * h + *s++;
return h ^ (h >> 16);
}
static int countlines(char *map, int maplen)
{
int numl;
char *end = map + maplen;
char *p = map;
if (maplen == 0)
return 0;
numl = 0;
while (p < end && (p = memchr(p, '\n', end - p)) != NULL) {
numl++;
p++;
}
if (p < end)
numl++;
return numl;
}
static void fill_lines(char **lines, int maxline, char *map, int maplen)
{
int l;
char *end = map + maplen;
char *p = map;
if (maplen == 0 || maxline == 0)
return;
l = 0;
lines[l++] = map;
while (p < end && (p = memchr(p, '\n', end - p)) != NULL) {
if (l >= maxline)
return;
lines[l++] = ++p;
}
if (p < end)
lines[l] = p;
}
static void free_srcfile(struct srcfile *sf)
{
list_del_init(&sf->nd);
hlist_del(&sf->hash_nd);
map_total_sz -= sf->maplen;
munmap(sf->map, sf->maplen);
zfree(&sf->lines);
zfree(&sf->fn);
free(sf);
num_srcfiles--;
}
static struct srcfile *find_srcfile(char *fn)
{
struct stat st;
struct srcfile *h;
int fd;
unsigned long sz;
unsigned hval = shash((unsigned char *)fn) % SRC_HTAB_SZ;
hlist_for_each_entry (h, &srcfile_htab[hval], hash_nd) {
if (!strcmp(fn, h->fn)) {
/* Move to front */
list_del(&h->nd);
list_add(&h->nd, &srcfile_list);
return h;
}
}
/* Only prune if there is more than one entry */
while ((num_srcfiles > MAXSRCFILES || map_total_sz > MAXSRCCACHE) &&
srcfile_list.next != &srcfile_list) {
assert(!list_empty(&srcfile_list));
h = list_entry(srcfile_list.prev, struct srcfile, nd);
free_srcfile(h);
}
fd = open(fn, O_RDONLY);
if (fd < 0 || fstat(fd, &st) < 0) {
pr_debug("cannot open source file %s\n", fn);
return NULL;
}
h = malloc(sizeof(struct srcfile));
if (!h)
return NULL;
h->fn = strdup(fn);
if (!h->fn)
goto out_h;
h->maplen = st.st_size;
sz = (h->maplen + page_size - 1) & ~(page_size - 1);
h->map = mmap(NULL, sz, PROT_READ, MAP_SHARED, fd, 0);
close(fd);
if (h->map == (char *)-1) {
pr_debug("cannot mmap source file %s\n", fn);
goto out_fn;
}
h->numlines = countlines(h->map, h->maplen);
h->lines = calloc(h->numlines, sizeof(char *));
if (!h->lines)
goto out_map;
fill_lines(h->lines, h->numlines, h->map, h->maplen);
list_add(&h->nd, &srcfile_list);
hlist_add_head(&h->hash_nd, &srcfile_htab[hval]);
map_total_sz += h->maplen;
num_srcfiles++;
return h;
out_map:
munmap(h->map, sz);
out_fn:
zfree(&h->fn);
out_h:
free(h);
return NULL;
}
/* Result is not 0 terminated */
char *find_sourceline(char *fn, unsigned line, int *lenp)
{
char *l, *p;
struct srcfile *sf = find_srcfile(fn);
if (!sf)
return NULL;
line--;
if (line >= sf->numlines)
return NULL;
l = sf->lines[line];
if (!l)
return NULL;
p = memchr(l, '\n', sf->map + sf->maplen - l);
*lenp = p - l;
return l;
}