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c037f1f616
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35027 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
615 lines
14 KiB
C
615 lines
14 KiB
C
/**********************************************************************
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addr2line.h -
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$Author$
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Copyright (C) 2010 Shinichiro Hamaji
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**********************************************************************/
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#include "ruby/config.h"
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#include "addr2line.h"
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#include <stdio.h>
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#include <errno.h>
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#ifdef USE_ELF
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#ifdef __OpenBSD__
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#include <elf_abi.h>
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#else
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#include <elf.h>
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#endif
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#include <fcntl.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#if defined(HAVE_ALLOCA_H)
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#include <alloca.h>
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#endif
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#ifdef HAVE_DL_ITERATE_PHDR
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# ifndef _GNU_SOURCE
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# define _GNU_SOURCE
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# endif
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# include <link.h>
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#endif
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#define DW_LNS_copy 0x01
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#define DW_LNS_advance_pc 0x02
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#define DW_LNS_advance_line 0x03
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#define DW_LNS_set_file 0x04
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#define DW_LNS_set_column 0x05
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#define DW_LNS_negate_stmt 0x06
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#define DW_LNS_set_basic_block 0x07
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#define DW_LNS_const_add_pc 0x08
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#define DW_LNS_fixed_advance_pc 0x09
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#define DW_LNS_set_prologue_end 0x0a /* DWARF3 */
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#define DW_LNS_set_epilogue_begin 0x0b /* DWARF3 */
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#define DW_LNS_set_isa 0x0c /* DWARF3 */
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/* Line number extended opcode name. */
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#define DW_LNE_end_sequence 0x01
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#define DW_LNE_set_address 0x02
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#define DW_LNE_define_file 0x03
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#define DW_LNE_set_discriminator 0x04 /* DWARF4 */
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#ifndef ElfW
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# if SIZEOF_VOIDP == 8
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# define ElfW(x) Elf64##_##x
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# else
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# define ElfW(x) Elf32##_##x
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# endif
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#endif
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#ifndef PATH_MAX
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#define PATH_MAX 4096
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#endif
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typedef struct {
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const char *dirname;
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const char *filename;
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int line;
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int fd;
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void *mapped;
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size_t mapped_size;
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unsigned long base_addr;
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} line_info_t;
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/* Avoid consuming stack as this module may be used from signal handler */
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static char binary_filename[PATH_MAX];
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static unsigned long
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uleb128(char **p)
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{
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unsigned long r = 0;
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int s = 0;
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for (;;) {
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unsigned char b = *(unsigned char *)(*p)++;
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if (b < 0x80) {
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r += (unsigned long)b << s;
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break;
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}
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r += (b & 0x7f) << s;
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s += 7;
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}
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return r;
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}
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static long
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sleb128(char **p)
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{
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long r = 0;
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int s = 0;
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for (;;) {
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unsigned char b = *(unsigned char *)(*p)++;
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if (b < 0x80) {
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if (b & 0x40) {
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r -= (0x80 - b) << s;
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}
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else {
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r += (b & 0x3f) << s;
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}
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break;
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}
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r += (b & 0x7f) << s;
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s += 7;
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}
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return r;
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}
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static const char *
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get_nth_dirname(unsigned long dir, char *p)
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{
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if (!dir--) {
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return "";
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}
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while (dir--) {
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while (*p) p++;
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p++;
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if (!*p) {
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fprintf(stderr, "Unexpected directory number %lu in %s\n",
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dir, binary_filename);
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return "";
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}
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}
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return p;
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}
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static void
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fill_filename(int file, char *include_directories, char *filenames,
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line_info_t *line)
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{
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int i;
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char *p = filenames;
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char *filename;
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unsigned long dir;
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for (i = 1; i <= file; i++) {
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filename = p;
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if (!*p) {
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/* Need to output binary file name? */
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fprintf(stderr, "Unexpected file number %d in %s\n",
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file, binary_filename);
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return;
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}
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while (*p) p++;
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p++;
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dir = uleb128(&p);
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/* last modified. */
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uleb128(&p);
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/* size of the file. */
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uleb128(&p);
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if (i == file) {
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line->filename = filename;
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line->dirname = get_nth_dirname(dir, include_directories);
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}
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}
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}
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static int
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get_path_from_symbol(const char *symbol, const char **p, size_t *len)
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{
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if (symbol[0] == '0') {
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/* libexecinfo */
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*p = strchr(symbol, '/');
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if (*p == NULL) return 0;
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*len = strlen(*p);
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}
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else {
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/* glibc */
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const char *q;
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*p = symbol;
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q = strchr(symbol, '(');
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if (q == NULL) return 0;
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*len = q - symbol;
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}
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return 1;
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}
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static void
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fill_line(int num_traces, void **traces,
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unsigned long addr, int file, int line,
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char *include_directories, char *filenames, line_info_t *lines)
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{
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int i;
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for (i = 0; i < num_traces; i++) {
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unsigned long a = (unsigned long)traces[i] - lines[i].base_addr;
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/* We assume one line code doesn't result >100 bytes of native code.
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We may want more reliable way eventually... */
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if (addr < a && a < addr + 100) {
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fill_filename(file, include_directories, filenames, &lines[i]);
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lines[i].line = line;
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}
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}
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}
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static void
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parse_debug_line_cu(int num_traces, void **traces,
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char **debug_line, line_info_t *lines)
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{
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char *p, *cu_end, *cu_start, *include_directories, *filenames;
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unsigned long unit_length;
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int default_is_stmt, line_base;
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unsigned int header_length, minimum_instruction_length, line_range,
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opcode_base;
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unsigned char *standard_opcode_lengths;
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/* The registers. */
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unsigned long addr = 0;
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unsigned int file = 1;
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unsigned int line = 1;
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unsigned int column = 0;
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int is_stmt;
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int basic_block = 0;
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int end_sequence = 0;
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int prologue_end = 0;
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int epilogue_begin = 0;
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unsigned int isa = 0;
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p = *debug_line;
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unit_length = *(unsigned int *)p;
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p += sizeof(unsigned int);
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if (unit_length == 0xffffffff) {
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unit_length = *(unsigned long *)p;
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p += sizeof(unsigned long);
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}
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cu_end = p + unit_length;
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/*dwarf_version = *(unsigned short *)p;*/
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p += 2;
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header_length = *(unsigned int *)p;
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p += sizeof(unsigned int);
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cu_start = p + header_length;
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minimum_instruction_length = *(unsigned char *)p;
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p++;
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is_stmt = default_is_stmt = *(unsigned char *)p;
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p++;
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line_base = *(char *)p;
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p++;
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line_range = *(unsigned char *)p;
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p++;
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opcode_base = *(unsigned char *)p;
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p++;
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standard_opcode_lengths = (unsigned char *)p - 1;
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p += opcode_base - 1;
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include_directories = p;
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/* skip include directories */
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while (*p) {
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while (*p) p++;
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p++;
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}
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p++;
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filenames = p;
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p = cu_start;
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#define FILL_LINE() \
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do { \
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fill_line(num_traces, traces, addr, file, line, \
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include_directories, filenames, lines); \
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basic_block = prologue_end = epilogue_begin = 0; \
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} while (0)
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while (p < cu_end) {
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unsigned long a;
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unsigned char op = *p++;
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switch (op) {
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case DW_LNS_copy:
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FILL_LINE();
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break;
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case DW_LNS_advance_pc:
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a = uleb128(&p);
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addr += a;
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break;
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case DW_LNS_advance_line: {
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long a = sleb128(&p);
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line += a;
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break;
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}
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case DW_LNS_set_file:
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file = (unsigned int)uleb128(&p);
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break;
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case DW_LNS_set_column:
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column = (unsigned int)uleb128(&p);
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break;
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case DW_LNS_negate_stmt:
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is_stmt = !is_stmt;
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break;
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case DW_LNS_set_basic_block:
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basic_block = 1;
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break;
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case DW_LNS_const_add_pc:
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a = ((255 - opcode_base) / line_range) *
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minimum_instruction_length;
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addr += a;
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break;
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case DW_LNS_fixed_advance_pc:
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a = *(unsigned char *)p++;
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addr += a;
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break;
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case DW_LNS_set_prologue_end:
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prologue_end = 1;
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break;
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case DW_LNS_set_epilogue_begin:
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epilogue_begin = 1;
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break;
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case DW_LNS_set_isa:
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isa = (unsigned int)uleb128(&p);
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break;
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case 0:
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a = *(unsigned char *)p++;
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op = *p++;
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switch (op) {
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case DW_LNE_end_sequence:
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end_sequence = 1;
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FILL_LINE();
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addr = 0;
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file = 1;
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line = 1;
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column = 0;
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is_stmt = default_is_stmt;
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end_sequence = 0;
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isa = 0;
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break;
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case DW_LNE_set_address:
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addr = *(unsigned long *)p;
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p += sizeof(unsigned long);
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break;
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case DW_LNE_define_file:
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fprintf(stderr, "Unsupported operation in %s\n",
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binary_filename);
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break;
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case DW_LNE_set_discriminator:
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/* TODO:currently ignore */
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uleb128(&p);
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break;
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default:
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fprintf(stderr, "Unknown extended opcode: %d in %s\n",
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op, binary_filename);
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}
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break;
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default: {
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unsigned long addr_incr;
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unsigned long line_incr;
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a = op - opcode_base;
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addr_incr = (a / line_range) * minimum_instruction_length;
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line_incr = line_base + (a % line_range);
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addr += (unsigned int)addr_incr;
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line += (unsigned int)line_incr;
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FILL_LINE();
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}
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}
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}
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*debug_line = p;
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}
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static void
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parse_debug_line(int num_traces, void **traces,
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char *debug_line, unsigned long size, line_info_t *lines)
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{
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char *debug_line_end = debug_line + size;
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while (debug_line < debug_line_end) {
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parse_debug_line_cu(num_traces, traces, &debug_line, lines);
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}
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if (debug_line != debug_line_end) {
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fprintf(stderr, "Unexpected size of .debug_line in %s\n",
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binary_filename);
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}
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}
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/* read file and fill lines */
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static void
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fill_lines(int num_traces, void **traces, char **syms, int check_debuglink,
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line_info_t *current_line, line_info_t *lines);
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static void
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follow_debuglink(char *debuglink, int num_traces, void **traces, char **syms,
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line_info_t *current_line, line_info_t *lines)
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{
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/* Ideally we should check 4 paths to follow gnu_debuglink,
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but we handle only one case for now as this format is used
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by some linux distributions. See GDB's info for detail. */
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static const char global_debug_dir[] = "/usr/lib/debug";
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char *p, *subdir;
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p = strrchr(binary_filename, '/');
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if (!p) {
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return;
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}
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p[1] = '\0';
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subdir = (char *)alloca(strlen(binary_filename) + 1);
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strcpy(subdir, binary_filename);
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strcpy(binary_filename, global_debug_dir);
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strncat(binary_filename, subdir,
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PATH_MAX - strlen(binary_filename) - 1);
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strncat(binary_filename, debuglink,
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PATH_MAX - strlen(binary_filename) - 1);
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munmap(current_line->mapped, current_line->mapped_size);
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close(current_line->fd);
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fill_lines(num_traces, traces, syms, 0, current_line, lines);
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}
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/* read file and fill lines */
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static void
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fill_lines(int num_traces, void **traces, char **syms, int check_debuglink,
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line_info_t *current_line, line_info_t *lines)
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{
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int i;
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char *shstr;
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char *section_name;
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ElfW(Ehdr) *ehdr;
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ElfW(Shdr) *shdr, *shstr_shdr;
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ElfW(Shdr) *debug_line_shdr = NULL, *gnu_debuglink_shdr = NULL;
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int fd;
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off_t filesize;
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char *file;
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fd = open(binary_filename, O_RDONLY);
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if (fd < 0) {
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return;
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}
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filesize = lseek(fd, 0, SEEK_END);
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if (filesize < 0) {
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int e = errno;
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close(fd);
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fprintf(stderr, "lseek: %s\n", strerror(e));
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return;
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}
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lseek(fd, 0, SEEK_SET);
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/* async-signal unsafe */
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file = (char *)mmap(NULL, filesize, PROT_READ, MAP_SHARED, fd, 0);
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if (file == MAP_FAILED) {
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int e = errno;
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close(fd);
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fprintf(stderr, "mmap: %s\n", strerror(e));
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return;
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}
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current_line->fd = fd;
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current_line->mapped = file;
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current_line->mapped_size = filesize;
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for (i = 0; i < num_traces; i++) {
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const char *path;
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size_t len;
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if (get_path_from_symbol(syms[i], &path, &len) &&
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!strncmp(path, binary_filename, len)) {
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lines[i].line = -1;
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}
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}
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ehdr = (ElfW(Ehdr) *)file;
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shdr = (ElfW(Shdr) *)(file + ehdr->e_shoff);
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shstr_shdr = shdr + ehdr->e_shstrndx;
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shstr = file + shstr_shdr->sh_offset;
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for (i = 0; i < ehdr->e_shnum; i++) {
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section_name = shstr + shdr[i].sh_name;
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if (!strcmp(section_name, ".debug_line")) {
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debug_line_shdr = shdr + i;
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break;
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} else if (!strcmp(section_name, ".gnu_debuglink")) {
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gnu_debuglink_shdr = shdr + i;
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}
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}
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if (!debug_line_shdr) {
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/* This file doesn't have .debug_line section,
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let's check .gnu_debuglink section instead. */
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if (gnu_debuglink_shdr && check_debuglink) {
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follow_debuglink(file + gnu_debuglink_shdr->sh_offset,
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num_traces, traces, syms,
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current_line, lines);
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}
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return;
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}
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parse_debug_line(num_traces, traces,
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file + debug_line_shdr->sh_offset,
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debug_line_shdr->sh_size,
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lines);
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}
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#ifdef HAVE_DL_ITERATE_PHDR
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typedef struct {
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int num_traces;
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char **syms;
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line_info_t *lines;
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} fill_base_addr_state_t;
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static int
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fill_base_addr(struct dl_phdr_info *info, size_t size, void *data)
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{
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int i;
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fill_base_addr_state_t *st = (fill_base_addr_state_t *)data;
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for (i = 0; i < st->num_traces; i++) {
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const char *path;
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size_t len;
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size_t name_len = strlen(info->dlpi_name);
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if (get_path_from_symbol(st->syms[i], &path, &len) &&
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(len == name_len || (len > name_len && path[len-name_len-1] == '/')) &&
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!strncmp(path+len-name_len, info->dlpi_name, name_len)) {
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st->lines[i].base_addr = info->dlpi_addr;
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}
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}
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return 0;
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}
|
|
|
|
#endif /* HAVE_DL_ITERATE_PHDR */
|
|
|
|
void
|
|
rb_dump_backtrace_with_lines(int num_traces, void **trace, char **syms)
|
|
{
|
|
int i;
|
|
/* async-signal unsafe */
|
|
line_info_t *lines = (line_info_t *)calloc(num_traces,
|
|
sizeof(line_info_t));
|
|
|
|
/* Note that line info of shared objects might not be shown
|
|
if we don't have dl_iterate_phdr */
|
|
#ifdef HAVE_DL_ITERATE_PHDR
|
|
fill_base_addr_state_t fill_base_addr_state;
|
|
|
|
fill_base_addr_state.num_traces = num_traces;
|
|
fill_base_addr_state.syms = syms;
|
|
fill_base_addr_state.lines = lines;
|
|
/* maybe async-signal unsafe */
|
|
dl_iterate_phdr(fill_base_addr, &fill_base_addr_state);
|
|
#endif /* HAVE_DL_ITERATE_PHDR */
|
|
|
|
for (i = 0; i < num_traces; i++) {
|
|
const char *path;
|
|
size_t len;
|
|
if (lines[i].line) {
|
|
continue;
|
|
}
|
|
|
|
if (!get_path_from_symbol(syms[i], &path, &len)) {
|
|
continue;
|
|
}
|
|
|
|
strncpy(binary_filename, path, len);
|
|
binary_filename[len] = '\0';
|
|
|
|
fill_lines(num_traces, trace, syms, 1, &lines[i], lines);
|
|
}
|
|
|
|
/* fprintf may not be async-signal safe */
|
|
for (i = 0; i < num_traces; i++) {
|
|
line_info_t *line = &lines[i];
|
|
|
|
if (line->line > 0) {
|
|
fprintf(stderr, "%s ", syms[i]);
|
|
if (line->filename) {
|
|
if (line->dirname && line->dirname[0]) {
|
|
fprintf(stderr, "%s/", line->dirname);
|
|
}
|
|
fprintf(stderr, "%s", line->filename);
|
|
} else {
|
|
fprintf(stderr, "???");
|
|
}
|
|
fprintf(stderr, ":%d\n", line->line);
|
|
} else {
|
|
fprintf(stderr, "%s\n", syms[i]);
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < num_traces; i++) {
|
|
line_info_t *line = &lines[i];
|
|
if (line->fd) {
|
|
munmap(line->mapped, line->mapped_size);
|
|
close(line->fd);
|
|
}
|
|
}
|
|
free(lines);
|
|
}
|
|
|
|
#else /* defined(USE_ELF) */
|
|
#error not supported
|
|
#endif
|