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e226046cb8
# ignore-this-changeset Depends on D28954 Differential Revision: https://phabricator.services.mozilla.com/D28956 --HG-- extra : moz-landing-system : lando
129 lines
3.6 KiB
C++
129 lines
3.6 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "leaky.h"
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#ifdef USE_ELF
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# include "leaky.h"
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# include <stdio.h>
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# include <malloc.h>
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# include <libelf/libelf.h>
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# include <unistd.h>
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# include <fcntl.h>
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# include <string.h>
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void leaky::readSymbols(const char* fileName) {
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int fd = ::open(fileName, O_RDONLY);
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if (fd < 0) {
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fprintf(stderr, "%s: unable to open \"%s\"\n", applicationName, fileName);
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exit(-1);
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}
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elf_version(EV_CURRENT);
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Elf* elf = elf_begin(fd, ELF_C_READ, 0);
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if (!elf) {
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fprintf(stderr, "%s: \"%s\": has no symbol table\n", applicationName,
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fileName);
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exit(-1);
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}
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long alloced = 10000;
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Symbol* syms = (Symbol*)malloc(sizeof(Symbol) * 10000);
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Symbol* sp = syms;
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Symbol* last = syms + alloced;
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// Get each of the relevant sections and add them to the list of
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// symbols.
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Elf32_Ehdr* ehdr = elf32_getehdr(elf);
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if (!ehdr) {
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fprintf(stderr, "%s: elf library lossage\n", applicationName);
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exit(-1);
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}
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# if 0
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Elf32_Half ndx = ehdr->e_shstrndx;
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# endif
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Elf_Scn* scn = 0;
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int strtabndx = -1;
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for (int i = 1; (scn = elf_nextscn(elf, scn)) != 0; i++) {
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Elf32_Shdr* shdr = elf32_getshdr(scn);
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# if 0
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char *name = elf_strptr(elf, ndx, (size_t) shdr->sh_name);
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printf("Section %s (%d 0x%x)\n", name ? name : "(null)",
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shdr->sh_type, shdr->sh_type);
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# endif
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if (shdr->sh_type == SHT_STRTAB) {
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/* We assume here that string tables preceed symbol tables... */
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strtabndx = i;
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continue;
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}
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# if 0
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if (shdr->sh_type == SHT_DYNAMIC) {
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/* Dynamic */
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Elf_Data *data = elf_getdata(scn, 0);
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if (!data || !data->d_size) {
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printf("No data...");
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continue;
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}
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Elf32_Dyn *dyn = (Elf32_Dyn*) data->d_buf;
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Elf32_Dyn *lastdyn =
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(Elf32_Dyn*) ((char*) data->d_buf + data->d_size);
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for (; dyn < lastdyn; dyn++) {
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printf("tag=%d value=0x%x\n", dyn->d_tag, dyn->d_un.d_val);
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}
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} else
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# endif
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if ((shdr->sh_type == SHT_SYMTAB) || (shdr->sh_type == SHT_DYNSYM)) {
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/* Symbol table */
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Elf_Data* data = elf_getdata(scn, 0);
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if (!data || !data->d_size) {
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printf("No data...");
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continue;
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}
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/* In theory we now have the symbols... */
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Elf32_Sym* esym = (Elf32_Sym*)data->d_buf;
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Elf32_Sym* lastsym = (Elf32_Sym*)((char*)data->d_buf + data->d_size);
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for (; esym < lastsym; esym++) {
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# if 0
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char *nm = elf_strptr(elf, strtabndx, (size_t)esym->st_name);
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printf("%20s 0x%08x %02x %02x\n",
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nm, esym->st_value, ELF32_ST_BIND(esym->st_info),
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ELF32_ST_TYPE(esym->st_info));
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# endif
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if ((esym->st_value == 0) ||
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(ELF32_ST_BIND(esym->st_info) == STB_WEAK) ||
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(ELF32_ST_BIND(esym->st_info) == STB_NUM) ||
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(ELF32_ST_TYPE(esym->st_info) != STT_FUNC)) {
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continue;
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}
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# if 1
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char* nm = elf_strptr(elf, strtabndx, (size_t)esym->st_name);
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# endif
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sp->name = nm ? strdup(nm) : "(no name)";
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sp->address = esym->st_value;
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sp++;
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if (sp >= last) {
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long n = alloced + 10000;
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syms = (Symbol*)realloc(syms, (size_t)(sizeof(Symbol) * n));
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last = syms + n;
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sp = syms + alloced;
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alloced = n;
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}
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}
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}
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}
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int interesting = sp - syms;
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if (!quiet) {
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printf("Total of %d symbols\n", interesting);
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}
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usefulSymbols = interesting;
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externalSymbols = syms;
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}
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#endif /* USE_ELF */
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