mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
aac6614bdc
EGCS assign weak symbols to inline functions it couldn't inline (e.g. virtual inline functions), template functions, etc. Omitting them result in quite bogus profile. Weak symbols created by __weak_reference are not really problem. Caught by: Ilya Segalovich <iseg@comptek.ru>
106 lines
2.5 KiB
C
106 lines
2.5 KiB
C
#include <sys/types.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <elf.h>
|
|
#include <err.h>
|
|
#include <fcntl.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include "gprof.h"
|
|
|
|
static bool wantsym(const Elf_Sym *, const char *);
|
|
|
|
/* Things which get -E excluded by default. */
|
|
static char *excludes[] = { ".mcount", "_mcleanup", NULL };
|
|
|
|
int
|
|
elf_getnfile(const char *filename, char ***defaultEs)
|
|
{
|
|
int fd;
|
|
Elf_Ehdr h;
|
|
struct stat s;
|
|
void *mapbase;
|
|
const char *base;
|
|
const Elf_Shdr *shdrs;
|
|
const Elf_Shdr *sh_symtab;
|
|
const Elf_Shdr *sh_strtab;
|
|
const char *strtab;
|
|
const Elf_Sym *symtab;
|
|
int symtabct;
|
|
int i;
|
|
|
|
if ((fd = open(filename, O_RDONLY)) == -1)
|
|
err(1, "%s", filename);
|
|
if (read(fd, &h, sizeof h) != sizeof h || !IS_ELF(h)) {
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
if (fstat(fd, &s) == -1)
|
|
err(1, "Cannot fstat %s", filename);
|
|
if ((mapbase = mmap(0, s.st_size, PROT_READ, MAP_SHARED, fd, 0)) ==
|
|
MAP_FAILED)
|
|
err(1, "Cannot mmap %s", filename);
|
|
close(fd);
|
|
|
|
base = (const char *)mapbase;
|
|
shdrs = (const Elf_Shdr *)(base + h.e_shoff);
|
|
|
|
/* Find the symbol table and associated string table section. */
|
|
for (i = 1; i < h.e_shnum; i++)
|
|
if (shdrs[i].sh_type == SHT_SYMTAB)
|
|
break;
|
|
if (i == h.e_shnum)
|
|
errx(1, "%s has no symbol table", filename);
|
|
sh_symtab = &shdrs[i];
|
|
sh_strtab = &shdrs[sh_symtab->sh_link];
|
|
|
|
symtab = (const Elf_Sym *)(base + sh_symtab->sh_offset);
|
|
symtabct = sh_symtab->sh_size / sh_symtab->sh_entsize;
|
|
strtab = (const char *)(base + sh_strtab->sh_offset);
|
|
|
|
/* Count the symbols that we're interested in. */
|
|
nname = 0;
|
|
for (i = 1; i < symtabct; i++)
|
|
if (wantsym(&symtab[i], strtab))
|
|
nname++;
|
|
|
|
/* Allocate memory for them, plus a terminating entry. */
|
|
if ((nl = (nltype *)calloc(nname + 1, sizeof(nltype))) == NULL)
|
|
errx(1, "Insufficient memory for symbol table");
|
|
|
|
/* Read them in. */
|
|
npe = nl;
|
|
for (i = 1; i < symtabct; i++) {
|
|
const Elf_Sym *sym = &symtab[i];
|
|
|
|
if (wantsym(sym, strtab)) {
|
|
npe->value = sym->st_value;
|
|
npe->name = strtab + sym->st_name;
|
|
npe++;
|
|
}
|
|
}
|
|
npe->value = -1;
|
|
|
|
*defaultEs = excludes;
|
|
return 0;
|
|
}
|
|
|
|
static bool
|
|
wantsym(const Elf_Sym *sym, const char *strtab)
|
|
{
|
|
int type;
|
|
int bind;
|
|
|
|
type = ELF_ST_TYPE(sym->st_info);
|
|
bind = ELF_ST_BIND(sym->st_info);
|
|
|
|
if (type != STT_FUNC ||
|
|
(aflag && bind == STB_LOCAL) ||
|
|
(uflag && strchr(strtab + sym->st_name, '.') != NULL))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|