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# ignore-this-changeset Depends on D28954 Differential Revision: https://phabricator.services.mozilla.com/D28956 --HG-- extra : moz-landing-system : lando
222 lines
6.0 KiB
C++
222 lines
6.0 KiB
C++
// vim:ts=8:sw=2:et:
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/* 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_BFD
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# include <stdio.h>
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# include <string.h>
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# include <fcntl.h>
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# include <unistd.h>
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# include <libgen.h>
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# include <bfd.h>
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# include <cxxabi.h>
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static bfd* try_debug_file(const char* filename, unsigned long crc32) {
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int fd = open(filename, O_RDONLY);
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if (fd < 0) return nullptr;
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unsigned char buf[4 * 1024];
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unsigned long crc = 0;
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while (1) {
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ssize_t count = read(fd, buf, sizeof(buf));
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if (count <= 0) break;
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crc = bfd_calc_gnu_debuglink_crc32(crc, buf, count);
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}
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close(fd);
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if (crc != crc32) return nullptr;
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bfd* object = bfd_openr(filename, nullptr);
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if (!bfd_check_format(object, bfd_object)) {
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bfd_close(object);
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return nullptr;
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}
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return object;
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}
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static bfd* find_debug_file(bfd* lib, const char* aFileName) {
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// check for a separate debug file with symbols
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asection* sect = bfd_get_section_by_name(lib, ".gnu_debuglink");
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if (!sect) return nullptr;
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bfd_size_type debuglinkSize = bfd_section_size(objfile->obfd, sect);
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char* debuglink = new char[debuglinkSize];
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bfd_get_section_contents(lib, sect, debuglink, 0, debuglinkSize);
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// crc checksum is aligned to 4 bytes, and after the NUL.
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int crc_offset = (int(strlen(debuglink)) & ~3) + 4;
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unsigned long crc32 = bfd_get_32(lib, debuglink + crc_offset);
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// directory component
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char* dirbuf = strdup(aFileName);
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const char* dir = dirname(dirbuf);
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static const char debug_subdir[] = ".debug";
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// This is gdb's default global debugging info directory, but gdb can
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// be instructed to use a different directory.
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static const char global_debug_dir[] = "/usr/lib/debug";
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char* filename =
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new char[strlen(global_debug_dir) + strlen(dir) + crc_offset + 3];
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// /path/debuglink
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sprintf(filename, "%s/%s", dir, debuglink);
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bfd* debugFile = try_debug_file(filename, crc32);
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if (!debugFile) {
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// /path/.debug/debuglink
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sprintf(filename, "%s/%s/%s", dir, debug_subdir, debuglink);
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debugFile = try_debug_file(filename, crc32);
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if (!debugFile) {
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// /usr/lib/debug/path/debuglink
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sprintf(filename, "%s/%s/%s", global_debug_dir, dir, debuglink);
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debugFile = try_debug_file(filename, crc32);
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}
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}
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delete[] filename;
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free(dirbuf);
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delete[] debuglink;
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return debugFile;
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}
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// Use an indirect array to avoid copying tons of objects
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Symbol** leaky::ExtendSymbols(int num) {
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long n = numExternalSymbols + num;
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externalSymbols = (Symbol**)realloc(externalSymbols,
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(size_t)(sizeof(externalSymbols[0]) * n));
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Symbol* new_array = new Symbol[n];
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for (int i = 0; i < num; i++) {
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externalSymbols[i + numExternalSymbols] = &new_array[i];
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}
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lastSymbol = externalSymbols + n;
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Symbol** sp = externalSymbols + numExternalSymbols;
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numExternalSymbols = n;
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return sp;
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}
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# define NEXT_SYMBOL \
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do { \
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sp++; \
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if (sp >= lastSymbol) { \
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sp = ExtendSymbols(16384); \
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} \
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} while (0)
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void leaky::ReadSymbols(const char* aFileName, u_long aBaseAddress) {
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int initialSymbols = usefulSymbols;
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if (nullptr == externalSymbols) {
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externalSymbols = (Symbol**)calloc(sizeof(Symbol*), 10000);
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Symbol* new_array = new Symbol[10000];
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for (int i = 0; i < 10000; i++) {
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externalSymbols[i] = &new_array[i];
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}
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numExternalSymbols = 10000;
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}
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Symbol** sp = externalSymbols + usefulSymbols;
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lastSymbol = externalSymbols + numExternalSymbols;
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// Create a dummy symbol for the library so, if it doesn't have any
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// symbols, we show it by library.
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(*sp)->Init(aFileName, aBaseAddress);
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NEXT_SYMBOL;
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bfd_boolean kDynamic = (bfd_boolean) false;
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static int firstTime = 1;
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if (firstTime) {
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firstTime = 0;
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bfd_init();
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}
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bfd* lib = bfd_openr(aFileName, nullptr);
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if (nullptr == lib) {
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return;
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}
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if (!bfd_check_format(lib, bfd_object)) {
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bfd_close(lib);
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return;
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}
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bfd* symbolFile = find_debug_file(lib, aFileName);
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// read mini symbols
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PTR minisyms;
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unsigned int size;
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long symcount = 0;
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if (symbolFile) {
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symcount = bfd_read_minisymbols(symbolFile, kDynamic, &minisyms, &size);
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if (symcount == 0) {
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bfd_close(symbolFile);
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} else {
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bfd_close(lib);
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}
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}
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if (symcount == 0) {
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symcount = bfd_read_minisymbols(lib, kDynamic, &minisyms, &size);
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if (symcount == 0) {
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// symtab is empty; try dynamic symbols
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kDynamic = (bfd_boolean) true;
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symcount = bfd_read_minisymbols(lib, kDynamic, &minisyms, &size);
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}
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symbolFile = lib;
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}
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asymbol* store;
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store = bfd_make_empty_symbol(symbolFile);
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// Scan symbols
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size_t demangle_buffer_size = 128;
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char* demangle_buffer = (char*)malloc(demangle_buffer_size);
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bfd_byte* from = (bfd_byte*)minisyms;
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bfd_byte* fromend = from + symcount * size;
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for (; from < fromend; from += size) {
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asymbol* sym;
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sym =
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bfd_minisymbol_to_symbol(symbolFile, kDynamic, (const PTR)from, store);
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symbol_info syminfo;
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bfd_get_symbol_info(symbolFile, sym, &syminfo);
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// if ((syminfo.type == 'T') || (syminfo.type == 't')) {
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const char* nm = bfd_asymbol_name(sym);
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if (nm && nm[0]) {
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char* dnm = nullptr;
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if (strncmp("__thunk", nm, 7)) {
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dnm =
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abi::__cxa_demangle(nm, demangle_buffer, &demangle_buffer_size, 0);
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if (dnm) {
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demangle_buffer = dnm;
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}
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}
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(*sp)->Init(dnm ? dnm : nm, syminfo.value + aBaseAddress);
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NEXT_SYMBOL;
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}
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// }
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}
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free(demangle_buffer);
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demangle_buffer = nullptr;
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bfd_close(symbolFile);
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int interesting = sp - externalSymbols;
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if (!quiet) {
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printf("%s provided %d symbols\n", aFileName, interesting - initialSymbols);
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}
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usefulSymbols = interesting;
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}
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#endif /* USE_BFD */
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