mirror of
https://github.com/frida/tinycc
synced 2024-12-24 05:56:49 +03:00
elf: rewrite version support
so it isn't quadratic in number of symbols. It's still quadratic in number of lib/version combinations (at library load time the sym versions are internalized), but that's much less a problem as in practice only glibc uses sym versioning.
This commit is contained in:
Michael Matz
parent
25781e4552
commit
8a93ce106a
393
tccelf.c
393
tccelf.c
@ -43,32 +43,19 @@ ST_DATA Section *symtab_section;
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ST_DATA Section *stab_section, *stabstr_section;
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/* elf version information */
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ST_DATA int nb_version_sym;
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struct sym_info_struct {
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char *name;
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ElfW(Sym) esym;
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};
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ST_DATA struct def_need_struct {
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char *lib;
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char *version;
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unsigned int nb_sym_info;
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struct sym_info_struct *sym_info;
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} *version_sym;
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ST_DATA int nb_need;
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ST_DATA int dt_verneednum;
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ST_DATA struct need_struct {
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int offset;
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char *lib;
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int n_aux;
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struct aux_struct {
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int offset;
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struct sym_version {
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char *lib;
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char *version;
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int other;
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} *aux;
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} *need;
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ST_DATA ElfW(Half) next_version = 1;
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ST_DATA Section *versym_section;
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ST_DATA Section *verneed_section;
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int out_index;
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int prev_same_lib;
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};
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static int nb_sym_versions;
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static struct sym_version *sym_versions;
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static int nb_sym_to_version;
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static int *sym_to_version;
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static int dt_verneednum;
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static Section *versym_section;
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static Section *verneed_section;
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/* XXX: avoid static variable */
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static int new_undef_sym = 0; /* Is there a new undefined sym since last new_undef_sym() */
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@ -139,6 +126,18 @@ ST_FUNC void tccelf_delete(TCCState *s1)
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{
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int i;
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/* free symbol versions */
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for (i = 0; i < nb_sym_versions; i++) {
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tcc_free(sym_versions[i].version);
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tcc_free(sym_versions[i].lib);
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}
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tcc_free(sym_versions);
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sym_versions = NULL;
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nb_sym_versions = 0;
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tcc_free(sym_to_version);
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sym_to_version = NULL;
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nb_sym_to_version = 0;
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/* free all sections */
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for(i = 1; i < s1->nb_sections; i++)
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free_section(s1->sections[i]);
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@ -557,219 +556,72 @@ ST_FUNC void* tcc_get_symbol_err(TCCState *s, const char *name)
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}
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#endif
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ST_FUNC void
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save_def_need_index (int *n_def_need, struct def_need_struct **def_need,
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unsigned int n, const char *lib, const char *version)
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{
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/* add index in table */
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if (*n_def_need < n + 1) {
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*def_need = (struct def_need_struct *)
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tcc_realloc (*def_need,
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(n + 1) * sizeof (struct def_need_struct));
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while (*n_def_need < n + 1) {
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(*def_need)[*n_def_need].lib = NULL;
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(*def_need)[*n_def_need].version = NULL;
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(*def_need)[*n_def_need].nb_sym_info = 0;
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(*def_need)[*n_def_need].sym_info = NULL;
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(*n_def_need)++;
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}
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}
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if ((*def_need)[n].lib == NULL) {
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(*def_need)[n].lib = tcc_strdup (lib);
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(*def_need)[n].version = tcc_strdup (version);
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}
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}
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ST_FUNC void
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free_def_need (int n_def_need, struct def_need_struct *def_need)
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{
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int i;
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for (i = 0; i < n_def_need; i++) {
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tcc_free (def_need[i].lib);
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tcc_free (def_need[i].version);
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}
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tcc_free (def_need);
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}
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ST_FUNC void
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add_version_sym (Section *s, int sym_index, int n_def_need,
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struct def_need_struct *def_need, const char *name, unsigned int n)
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{
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int i, j;
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ElfW(Sym) *esym;
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/* check if present */
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esym = &((ElfW(Sym) *)s->data)[sym_index];
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for (i = 0; i < nb_version_sym; i++) {
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for (j = 0; j < version_sym[i].nb_sym_info; j++) {
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if (strcmp (version_sym[i].sym_info[j].name, name) == 0) {
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if (memcmp (&version_sym[i].sym_info[j].esym, esym, sizeof (ElfW(Sym))) == 0) {
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return;
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}
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version_sym[i].nb_sym_info--;
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tcc_free (version_sym[i].sym_info[j].name);
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for (; j < version_sym[i].nb_sym_info; j++) {
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version_sym[i].sym_info[j] = version_sym[i].sym_info[j + 1];
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}
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}
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}
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}
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/* add new value */
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for (i = 0; i < nb_version_sym; i++) {
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if (strcmp (def_need[n].lib,
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version_sym[i].lib) == 0 &&
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strcmp (def_need[n].version,
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version_sym[i].version) == 0) {
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break;
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}
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}
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if (i == nb_version_sym) {
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version_sym = (struct def_need_struct *)
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tcc_realloc (version_sym,
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(nb_version_sym + 1) * sizeof (struct def_need_struct));
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version_sym[nb_version_sym].lib = tcc_strdup (def_need[n].lib);
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version_sym[nb_version_sym].version = tcc_strdup (def_need[n].version);
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version_sym[nb_version_sym].nb_sym_info = 0;
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version_sym[nb_version_sym].sym_info = NULL;
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nb_version_sym++;
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}
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version_sym[i].sym_info = (struct sym_info_struct *)
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tcc_realloc (version_sym[i].sym_info,
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(version_sym[i].nb_sym_info + 1) * sizeof (struct sym_info_struct));
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version_sym[i].sym_info[version_sym[i].nb_sym_info].name = tcc_strdup (name);
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version_sym[i].sym_info[version_sym[i].nb_sym_info].esym = *esym;
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version_sym[i].nb_sym_info++;
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}
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static void
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add_need_sym (Section *s, const char *soname, const char *version, const char *name, int sym_index)
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{
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int i;
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unsigned long size;
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void *ptr;
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int ver_index = 0;
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struct need_struct *verlib = NULL;
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ElfW(Half) vers;
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if (soname) {
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for (i = 0; i < nb_need; i++) {
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if (strcmp (soname, need[i].lib) == 0) {
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verlib = &need[i];
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break;
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}
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}
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if (verlib == NULL) {
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need = (struct need_struct *)
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tcc_realloc (need, (nb_need + 1) * sizeof (struct need_struct));
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need[nb_need].offset = put_elf_str(s->link, soname);
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need[nb_need].lib = tcc_strdup (soname);
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need[nb_need].n_aux = 0;
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need[nb_need].aux = NULL;
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verlib = &need[nb_need];
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nb_need++;
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}
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for (i = 0; i < verlib->n_aux; i++) {
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if (strcmp (version, verlib->aux[i].version) == 0) {
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ver_index = verlib->aux[i].other;
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}
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}
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if (ver_index == 0) {
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verlib->aux = (struct aux_struct *)
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tcc_realloc (verlib->aux, (verlib->n_aux + 1) * sizeof (struct aux_struct));
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verlib->aux[verlib->n_aux].offset = put_elf_str(s->link, version);
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verlib->aux[verlib->n_aux].version = tcc_strdup (version);
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ver_index = verlib->aux[verlib->n_aux].other = ++next_version;
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verlib->n_aux++;
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}
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}
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/* update versym section */
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size = versym_section->data_offset / sizeof (vers);
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for (i = size; i < (sym_index + 1); i++) {
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ptr = section_ptr_add (versym_section, sizeof (vers));
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vers = 0;
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memcpy (ptr, &vers, sizeof (vers));
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}
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ptr = versym_section->data + sym_index * sizeof (vers);
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vers = ver_index;
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memcpy (ptr, &vers, sizeof (vers));
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}
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static void
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version_add (TCCState *s)
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{
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int i, j, found;
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int i;
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ElfW(Sym) *sym;
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ElfW(Verneed) verneed;
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ElfW(Vernaux) aux;
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ElfW(Verneed) *vn = NULL;
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Section *symtab;
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int sym_index, end_sym;
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int sym_index, end_sym, nb_versions = 2, nb_entries = 0;
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ElfW(Half) *versym;
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const char *name;
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void *ptr;
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/* add needed symbols */
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symtab = s->dynsym;
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end_sym = symtab->data_offset / sizeof (ElfSym);
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versym = section_ptr_add(versym_section, end_sym * sizeof(ElfW(Half)));
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for (sym_index = 0; sym_index < end_sym; ++sym_index) {
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int dllindex, verndx;
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sym = &((ElfW(Sym) *)symtab->data)[sym_index];
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name = (char *) symtab->link->data + sym->st_name;
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found = 0;
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for (i = 0; !found && i < nb_version_sym; i++) {
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for (j = 0; !found && j < version_sym[i].nb_sym_info; j++) {
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if (strcmp (version_sym[i].sym_info[j].name, name) == 0) {
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found = 1;
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add_need_sym (symtab, version_sym[i].lib, version_sym[i].version, name, sym_index);
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}
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}
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}
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if (!found) {
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add_need_sym (symtab, NULL, NULL, NULL, sym_index);
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}
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symtab = s->dynsym; /* symtab can be realocated by add_need_sym */
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dllindex = find_elf_sym(s->dynsymtab_section, name);
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verndx = (dllindex && dllindex < nb_sym_to_version)
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? sym_to_version[dllindex] : -1;
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if (verndx >= 0) {
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if (!sym_versions[verndx].out_index)
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sym_versions[verndx].out_index = nb_versions++;
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versym[sym_index] = sym_versions[verndx].out_index;
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} else
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versym[sym_index] = 0;
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}
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/* generate verneed section */
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verneed_section->sh_info = nb_need;
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for (i = 0; i < nb_need; i++) {
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verneed.vn_version = 1;
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verneed.vn_cnt = need[i].n_aux;
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verneed.vn_file = need[i].offset;
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verneed.vn_aux = sizeof (verneed);
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verneed.vn_next = i == nb_need - 1 ? 0 : sizeof (verneed) + need[i].n_aux * sizeof (aux);
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ptr = section_ptr_add (verneed_section, sizeof (verneed));
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memcpy (ptr, &verneed, sizeof (verneed));
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for (j = 0; j < need[i].n_aux; j++) {
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aux.vna_hash = elf_hash (need[i].aux[j].version);
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aux.vna_flags = 0;
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aux.vna_other = need[i].aux[j].other;
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aux.vna_name = need[i].aux[j].offset;
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aux.vna_next = j == need[i].n_aux - 1 ? 0 : sizeof (aux);
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ptr = section_ptr_add (verneed_section, sizeof (aux));
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memcpy (ptr, &aux, sizeof (aux));
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}
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for (i = nb_sym_versions; i-- > 0;) {
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struct sym_version *sv = &sym_versions[i];
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int n_same_libs = 0, prev;
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size_t vnofs;
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ElfW(Vernaux) *vna;
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if (sv->out_index < 1)
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continue;
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vnofs = section_add(verneed_section, sizeof(*vn), 1);
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vn = (ElfW(Verneed)*)(verneed_section->data + vnofs);
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vn->vn_version = 1;
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vn->vn_file = put_elf_str(verneed_section->link, sv->lib);
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vn->vn_aux = sizeof (*vn);
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do {
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prev = sv->prev_same_lib;
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if (sv->out_index > 0) {
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vna = section_ptr_add(verneed_section, sizeof(*vna));
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vna->vna_hash = elf_hash (sv->version);
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vna->vna_flags = 0;
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vna->vna_other = sv->out_index;
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sv->out_index = -2;
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vna->vna_name = put_elf_str(verneed_section->link, sv->version);
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vna->vna_next = sizeof (*vna);
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n_same_libs++;
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}
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sv = &sym_versions[prev];
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} while(prev >= 0);
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vna->vna_next = 0;
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vn = (ElfW(Verneed)*)(verneed_section->data + vnofs);
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vn->vn_cnt = n_same_libs;
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vn->vn_next = sizeof(*vn) + n_same_libs * sizeof(*vna);
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nb_entries++;
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}
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/* free all info */
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for (i = 0; i < nb_version_sym; i++) {
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for (j = 0; j < version_sym[i].nb_sym_info; j++) {
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tcc_free (version_sym[i].sym_info[j].name);
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}
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tcc_free (version_sym[i].lib);
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tcc_free (version_sym[i].version);
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tcc_free (version_sym[i].sym_info);
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}
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tcc_free (version_sym);
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nb_version_sym = 0;
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version_sym = NULL;
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for (i = 0; i < nb_need; i++) {
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tcc_free (need[i].lib);
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for (j = 0; j < need[i].n_aux; j++) {
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tcc_free (need[i].aux[j].version);
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}
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tcc_free (need[i].aux);
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}
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tcc_free (need);
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dt_verneednum = nb_need;
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nb_need = 0;
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need = NULL;
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if (vn)
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vn->vn_next = 0;
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verneed_section->sh_info = nb_entries;
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dt_verneednum = nb_entries;
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}
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/* add an elf symbol : check if it is already defined and patch
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@ -3052,6 +2904,53 @@ ST_FUNC int tcc_load_archive(TCCState *s1, int fd, int alacarte)
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}
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#ifndef TCC_TARGET_PE
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/* Set LV[I] to the global index of sym-version (LIB,VERSION). Maybe resizes
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LV, maybe create a new entry for (LIB,VERSION). */
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static void set_ver_to_ver(int *n, int **lv, int i, char *lib, char *version)
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{
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while (i >= *n) {
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*lv = tcc_realloc(*lv, (*n + 1) * sizeof(**lv));
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(*lv)[(*n)++] = -1;
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}
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if ((*lv)[i] == -1) {
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int v, prev_same_lib = -1;
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for (v = 0; v < nb_sym_versions; v++) {
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if (strcmp(sym_versions[v].lib, lib))
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continue;
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prev_same_lib = v;
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if (!strcmp(sym_versions[v].version, version))
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break;
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}
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if (v == nb_sym_versions) {
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sym_versions = tcc_realloc (sym_versions,
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(v + 1) * sizeof(*sym_versions));
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sym_versions[v].lib = tcc_strdup(lib);
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sym_versions[v].version = tcc_strdup(version);
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sym_versions[v].out_index = 0;
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sym_versions[v].prev_same_lib = prev_same_lib;
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nb_sym_versions++;
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}
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(*lv)[i] = v;
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}
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}
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/* Associates symbol SYM_INDEX (in dynsymtab) with sym-version index
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VERNDX. */
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static void
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set_sym_version(int sym_index, int verndx)
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{
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if (sym_index >= nb_sym_to_version) {
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int newelems = sym_index ? sym_index * 2 : 1;
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sym_to_version = tcc_realloc(sym_to_version,
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newelems * sizeof(*sym_to_version));
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memset(sym_to_version + nb_sym_to_version, -1,
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(newelems - nb_sym_to_version) * sizeof(*sym_to_version));
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nb_sym_to_version = newelems;
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}
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if (sym_to_version[sym_index] < 0)
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sym_to_version[sym_index] = verndx;
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}
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/* load a DLL and all referenced DLLs. 'level = 0' means that the DLL
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is referenced by the user (so it should be added as DT_NEEDED in
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the generated ELF file) */
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@ -3066,12 +2965,11 @@ ST_FUNC int tcc_load_dll(TCCState *s1, int fd, const char *filename, int level)
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ElfW(Verdef) *verdef, *vdef;
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ElfW(Verneed) *verneed, *vneed;
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ElfW(Half) *versym, *vsym;
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unsigned char *dynstr;
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char *dynstr;
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uint32_t next;
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int sym_index;
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char *lib, *version;
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int n_def_need = 0;
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struct def_need_struct *def_need = NULL;
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int nb_local_ver = 0, *local_ver = NULL;
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const char *name, *soname;
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DLLReference *dllref;
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@ -3129,7 +3027,7 @@ ST_FUNC int tcc_load_dll(TCCState *s1, int fd, const char *filename, int level)
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for(i = 0, dt = dynamic; i < nb_dts; i++, dt++) {
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if (dt->d_tag == DT_SONAME) {
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soname = (char *) dynstr + dt->d_un.d_val;
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soname = dynstr + dt->d_un.d_val;
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}
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}
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||||
|
||||
@ -3164,20 +3062,17 @@ ST_FUNC int tcc_load_dll(TCCState *s1, int fd, const char *filename, int level)
|
||||
vdef->vd_version, vdef->vd_flags, vdef->vd_ndx,
|
||||
vdef->vd_hash);
|
||||
#endif
|
||||
for (i = 0; i < vdef->vd_cnt; i++) {
|
||||
version = (char *) dynstr + verdaux->vda_name;
|
||||
if (vdef->vd_cnt) {
|
||||
version = dynstr + verdaux->vda_name;
|
||||
|
||||
if (lib == NULL) {
|
||||
if (lib == NULL)
|
||||
lib = version;
|
||||
}
|
||||
else {
|
||||
save_def_need_index (&n_def_need, &def_need,
|
||||
vdef->vd_ndx, lib, version);
|
||||
}
|
||||
else
|
||||
set_ver_to_ver(&nb_local_ver, &local_ver, vdef->vd_ndx,
|
||||
lib, version);
|
||||
#if DEBUG_VERSION
|
||||
printf (" verdaux(%u): %s\n", vdef->vd_ndx, version);
|
||||
#endif
|
||||
verdaux = (ElfW(Verdaux) *) (((char *) verdaux) + verdaux->vda_next);
|
||||
}
|
||||
next = vdef->vd_next;
|
||||
vdef = (ElfW(Verdef) *) (((char *) vdef) + next);
|
||||
@ -3189,15 +3084,15 @@ ST_FUNC int tcc_load_dll(TCCState *s1, int fd, const char *filename, int level)
|
||||
ElfW(Vernaux) *vernaux =
|
||||
(ElfW(Vernaux) *) (((char *) vneed) + vneed->vn_aux);
|
||||
|
||||
lib = (char *) dynstr + vneed->vn_file;
|
||||
lib = dynstr + vneed->vn_file;
|
||||
#if DEBUG_VERSION
|
||||
printf ("verneed: %u %s\n", vneed->vn_version, lib);
|
||||
#endif
|
||||
for (i = 0; i < vneed->vn_cnt; i++) {
|
||||
if ((vernaux->vna_other & 0x8000) == 0) { /* hidden */
|
||||
version = (char *) dynstr + vernaux->vna_name;
|
||||
save_def_need_index (&n_def_need, &def_need,
|
||||
vernaux->vna_other, lib, version);
|
||||
version = dynstr + vernaux->vna_name;
|
||||
set_ver_to_ver(&nb_local_ver, &local_ver, vernaux->vna_other,
|
||||
lib, version);
|
||||
#if DEBUG_VERSION
|
||||
printf (" vernaux(%u): %u %u %s\n",
|
||||
vernaux->vna_other, vernaux->vna_hash,
|
||||
@ -3212,10 +3107,11 @@ ST_FUNC int tcc_load_dll(TCCState *s1, int fd, const char *filename, int level)
|
||||
}
|
||||
|
||||
#if DEBUG_VERSION
|
||||
for (i = 0; i < n_def_need; i++) {
|
||||
if (def_need[i].lib) {
|
||||
for (i = 0; i < nb_local_ver; i++) {
|
||||
if (local_ver[i] > 0) {
|
||||
printf ("%d: lib: %s, version %s\n",
|
||||
i, def_need[i].lib, def_need[i].version);
|
||||
i, sym_versions[local_ver[i]].lib,
|
||||
sym_version[local_ver[i]].version);
|
||||
}
|
||||
}
|
||||
#endif
|
||||
@ -3231,13 +3127,12 @@ ST_FUNC int tcc_load_dll(TCCState *s1, int fd, const char *filename, int level)
|
||||
sym_bind = ELFW(ST_BIND)(sym->st_info);
|
||||
if (sym_bind == STB_LOCAL)
|
||||
continue;
|
||||
name = (char *) dynstr + sym->st_name;
|
||||
name = dynstr + sym->st_name;
|
||||
sym_index = set_elf_sym(s1->dynsymtab_section, sym->st_value, sym->st_size,
|
||||
sym->st_info, sym->st_other, sym->st_shndx, name);
|
||||
if (versym && n_def_need && (*vsym & 0x8000) == 0 &&
|
||||
*vsym > 0 && *vsym < n_def_need &&
|
||||
def_need[*vsym].lib) {
|
||||
add_version_sym (s1->dynsymtab_section, sym_index, n_def_need, def_need, name, *vsym);
|
||||
if (versym && (*vsym & 0x8000) == 0 &&
|
||||
*vsym > 0 && *vsym < nb_local_ver) {
|
||||
set_sym_version(sym_index, local_ver[*vsym]);
|
||||
}
|
||||
}
|
||||
|
||||
@ -3245,7 +3140,7 @@ ST_FUNC int tcc_load_dll(TCCState *s1, int fd, const char *filename, int level)
|
||||
for(i = 0, dt = dynamic; i < nb_dts; i++, dt++) {
|
||||
switch(dt->d_tag) {
|
||||
case DT_NEEDED:
|
||||
name = (char *) dynstr + dt->d_un.d_val;
|
||||
name = dynstr + dt->d_un.d_val;
|
||||
for(j = 0; j < s1->nb_loaded_dlls; j++) {
|
||||
dllref = s1->loaded_dlls[j];
|
||||
if (!strcmp(name, dllref->name))
|
||||
@ -3262,7 +3157,7 @@ ST_FUNC int tcc_load_dll(TCCState *s1, int fd, const char *filename, int level)
|
||||
}
|
||||
ret = 0;
|
||||
the_end:
|
||||
free_def_need (n_def_need, def_need);
|
||||
tcc_free(local_ver);
|
||||
tcc_free(dynstr);
|
||||
tcc_free(dynsym);
|
||||
tcc_free(dynamic);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user