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support compressed debug_line

Browse source 
https://blogs.oracle.com/solaris/elf_section_compression-v2
https://gnu.wildebeest.org/blog/mjw/2016/01/13/elf-libelf-compressed-sections-and-elfutils/

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64328 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
naruse 2018-08-13 02:56:06 +00:00
parent 8507904385
commit a20a2b0044
2 changed files with 55 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

59
addr2line.c
View file

@ -101,7 +101,9 @@ void *alloca();
#define PATH_MAX 4096 #define PATH_MAX 4096
#endif #endif
#ifndef SHF_COMPRESSED /* compatibility with glibc < 2.22 */ #ifdef SHF_COMPRESSED
#include <zlib.h>
#else /* compatibility with glibc < 2.22 */
#define SHF_COMPRESSED 0 #define SHF_COMPRESSED 0
#endif #endif
@ -478,6 +480,41 @@ follow_debuglink(const char *debuglink, int num_traces, void **traces,
fill_lines(num_traces, traces, 0, objp, lines, offset); fill_lines(num_traces, traces, 0, objp, lines, offset);
} }
static int
parse_compressed_debug_line(int num_traces, void **traces,
char *debug_line, unsigned long size,
obj_info_t *obj, line_info_t *lines, int offset)
{
void *uncompressed_debug_line;
ElfW(Chdr) *chdr = (ElfW(Chdr) *)debug_line;
unsigned long destsize = chdr->ch_size;
int ret = 0;
if (chdr->ch_type != ELFCOMPRESS_ZLIB) {
/* unsupported compression type */
return -1;
}
uncompressed_debug_line = malloc(destsize);
if (!uncompressed_debug_line) return -1;
ret = uncompress(uncompressed_debug_line, &destsize,
(const Bytef *)debug_line + sizeof(ElfW(Chdr)), size-sizeof(ElfW(Chdr)));
if (ret != Z_OK) { /* Z_OK = 0 */
goto finish;
}
ret = parse_debug_line(num_traces, traces,
uncompressed_debug_line,
destsize,
obj, lines, offset);
if (ret) {
goto finish;
}
finish:
free(uncompressed_debug_line);
return ret ? -1 : 0;
}
/* read file and fill lines */ /* read file and fill lines */
static uintptr_t static uintptr_t
fill_lines(int num_traces, void **traces, int check_debuglink, fill_lines(int num_traces, void **traces, int check_debuglink,
@ -644,12 +681,20 @@ fill_lines(int num_traces, void **traces, int check_debuglink,
goto finish; goto finish;
} }
if (!compressed_p && if (compressed_p) {
parse_debug_line(num_traces, traces, int r = parse_compressed_debug_line(num_traces, traces,
file + debug_line_shdr->sh_offset, file + debug_line_shdr->sh_offset,
debug_line_shdr->sh_size, debug_line_shdr->sh_size,
obj, lines, offset)) obj, lines, offset);
goto fail; if (r) goto fail;
}
else {
int r = parse_debug_line(num_traces, traces,
file + debug_line_shdr->sh_offset,
debug_line_shdr->sh_size,
obj, lines, offset);
if (r) goto fail;
}
finish: finish:
return dladdr_fbase; return dladdr_fbase;
fail: fail:

3
configure.ac
View file

@ -2451,6 +2451,9 @@ AS_IF([test "$rb_cv_binary_elf" = yes], [
AC_CHECK_HEADERS([elf.h elf_abi.h]) AC_CHECK_HEADERS([elf.h elf_abi.h])
AS_IF([test $ac_cv_header_elf_h = yes -o $ac_cv_header_elf_abi_h = yes], [ AS_IF([test $ac_cv_header_elf_h = yes -o $ac_cv_header_elf_abi_h = yes], [
AC_LIBOBJ([addr2line]) AC_LIBOBJ([addr2line])
AS_IF([test "x$compress_debug_sections" = xzlib], [
AC_CHECK_LIB([z], [uncompress])
])
]) ])
]) ])