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239 lines
6.6 KiB
C++
239 lines
6.6 KiB
C++
// vim:ts=8:sw=2:et:
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape Communications Corp.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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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extern "C" {
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char *cplus_demangle (const char *mangled, int options);
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}
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static bfd *try_debug_file(const char *filename, unsigned long crc32)
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{
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int fd = open(filename, O_RDONLY);
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if (fd < 0)
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return NULL;
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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)
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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)
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return NULL;
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bfd *object = bfd_openr(filename, NULL);
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if (!bfd_check_format(object, bfd_object)) {
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bfd_close(object);
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return NULL;
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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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{
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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)
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return NULL;
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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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#define NEXT_SYMBOL \
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sp++; \
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if (sp >= lastSymbol) { \
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long n = numExternalSymbols + 10000; \
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externalSymbols = (Symbol*) \
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realloc(externalSymbols, (size_t) (sizeof(Symbol) * n)); \
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lastSymbol = externalSymbols + n; \
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sp = externalSymbols + numExternalSymbols; \
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numExternalSymbols = n; \
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}
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void leaky::ReadSymbols(const char *aFileName, u_long aBaseAddress)
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{
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int initialSymbols = usefulSymbols;
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if (NULL == externalSymbols) {
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externalSymbols = (Symbol*) malloc(sizeof(Symbol) * 10000);
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numExternalSymbols = 10000;
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}
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Symbol* sp = externalSymbols + usefulSymbols;
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Symbol* 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, NULL);
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if (NULL == 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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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 = 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 = NULL;
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if (strncmp("__thunk", nm, 7)) {
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dnm = cplus_demangle(nm, 1);
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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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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,
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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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