117 lines
2.5 KiB
C
117 lines
2.5 KiB
C
#include <elf.h>
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#include <merror.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <melf.h>
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#include "link.h"
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#define SYMTAB_INIT_LEN 8
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int symtab_init(struct symbol_table *symtab)
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{
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symtab->len = 1;
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symtab->size = SYMTAB_INIT_LEN;
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symtab->syms = malloc(sizeof(Elf32_Sym) * SYMTAB_INIT_LEN);
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if (symtab->syms == NULL) {
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PERROR("cannot alloc");
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return M_ERROR;
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}
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symtab->syms[0] = (Elf32_Sym){0};
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symtab->map = NULL;
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return M_SUCCESS;
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}
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void symtab_free(struct symbol_table *symtab)
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{
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free(symtab->syms);
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}
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int symtab_push(struct symbol_table *symtab, const Elf32_Sym *sym)
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{
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if (symtab->len >= symtab->size) {
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size_t size = symtab->size *= 2;
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void *new = realloc(symtab->syms, sizeof(Elf32_Sym) * size);
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if (new == NULL) {
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PERROR("cannot realloc");
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return M_ERROR;
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}
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symtab->size = size;
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symtab->syms = new;
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}
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symtab->syms[symtab->len++] = *sym;
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return M_SUCCESS;
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}
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int symtab_get(struct symbol_table *symtab, Elf32_Sym **res, const char *name,
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int32_t obj_idx)
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{
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for (size_t i = 1; i < symtab->len; i++) {
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Elf32_Sym *sym = &symtab->syms[i];
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const char *symname = symtab->strtab->data + B32(sym->st_name);
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if (strcmp(name, symname) != 0)
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continue;
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// only allow retrevial of local variables from the
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// same object
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if (sym->st_info >> 4 != STB_GLOBAL && symtab->map != NULL &&
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obj_idx >= 0) {
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// we need to change the index by one since
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// symbol tables always start will a NULl symbol
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struct object *obj = symtab->map->meta[i - 1];
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if (obj->index != (uint32_t)obj_idx)
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continue;
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} else if (obj_idx < 0 && sym->st_info >> 4 != STB_GLOBAL) {
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// when obj_idx is -1, we only want to reutrn
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// global symbols
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continue;
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}
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if (res != NULL)
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*res = sym;
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return M_SUCCESS;
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}
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return M_ERROR;
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}
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int symtab_map_push(struct symbol_table_mapping *symtabm, struct object *meta)
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{
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if (symtabm->len >= symtabm->size) {
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uint32_t size = symtabm->size * 2;
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void *new = realloc(symtabm->meta,
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sizeof(struct object *) * size);
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if (new == NULL) {
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PERROR("cannot realloc");
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return M_ERROR;
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}
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symtabm->size = size;
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symtabm->meta = new;
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}
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symtabm->meta[symtabm->len++] = meta;
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return M_SUCCESS;
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}
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int symtab_map_init(struct symbol_table_mapping *symtabm)
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{
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symtabm->len = 0;
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symtabm->size = SYMTAB_INIT_LEN;
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symtabm->meta = malloc(sizeof(struct object *) * symtabm->size);
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if (symtabm->meta == NULL) {
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PERROR("cannot alloc");
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return M_ERROR;
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}
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return M_SUCCESS;
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}
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void symtab_map_free(struct symbol_table_mapping *symtabm)
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{
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free(symtabm->meta);
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}
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