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support compressed debug_line

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re-commit r64328
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@64331 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
naruse 2018-08-13 06:20:12 +00:00
parent 2132fb3316
commit bcf8f79d6d
2 changed files with 66 additions and 10 deletions
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61
addr2line.c
View file

@ -101,8 +101,12 @@ void *alloca();
#define PATH_MAX 4096
#endif
#ifndef SHF_COMPRESSED /* compatibility with glibc < 2.22 */
#define SHF_COMPRESSED 0
#ifdef SHF_COMPRESSED
# ifdef HAVE_LIBZ
# include <zlib.h>
# endif
#else /* compatibility with glibc < 2.22 */
# define SHF_COMPRESSED 0
#endif
PRINTF_ARGS(static int kprintf(const char *fmt, ...), 1, 2);
@ -478,6 +482,41 @@ follow_debuglink(const char *debuglink, int num_traces, void **traces,
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 */
static uintptr_t
fill_lines(int num_traces, void **traces, int check_debuglink,
@ -644,12 +683,22 @@ fill_lines(int num_traces, void **traces, int check_debuglink,
goto finish;
}
if (!compressed_p &&
parse_debug_line(num_traces, traces,
if (compressed_p) {
#ifdef HAVE_LIBZ
int r = parse_compressed_debug_line(num_traces, traces,
file + debug_line_shdr->sh_offset,
debug_line_shdr->sh_size,
obj, lines, offset))
goto fail;
obj, lines, offset);
if (r) goto fail;
#endif
}
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:
return dladdr_fbase;
fail:

11
configure.ac
View file

@ -2451,6 +2451,9 @@ AS_IF([test "$rb_cv_binary_elf" = yes], [
AC_CHECK_HEADERS([elf.h elf_abi.h])
AS_IF([test $ac_cv_header_elf_h = yes -o $ac_cv_header_elf_abi_h = yes], [
AC_LIBOBJ([addr2line])
AS_IF([test "x$compress_debug_sections" = xzlib], [
AC_CHECK_LIB([z], [uncompress])
])
])
])
@ -3067,7 +3070,11 @@ AS_CASE("$enable_shared", [yes], [
LIBRUBY_SO='lib$(RUBY_SO_NAME).$(SOEXT).$(MAJOR)'
LIBRUBY_SONAME='lib$(RUBY_SO_NAME).$(SOEXT).$(RUBY_PROGRAM_VERSION)'
LIBRUBY_ALIASES='$(LIBRUBY_SONAME) lib$(RUBY_SO_NAME).$(SOEXT)'
RUBY_APPEND_OPTIONS(LIBRUBY_DLDFLAGS, ["${linker_flag}-h${linker_flag:+,}"'$(@F)'])
AS_IF([test "$GCC" = yes], [
LIBRUBY_DLDFLAGS="$DLDFLAGS "'-Wl,-h,$(@F)'
], [
LIBRUBY_DLDFLAGS="$DLDFLAGS "'-h $(@F)'
])
XLDFLAGS="$XLDFLAGS "'-R${libdir}'
],
[hpux*], [
@ -3314,7 +3321,7 @@ AS_CASE(["$target_os"],
])
],
[cygwin*|mingw*], [
LIBRUBY_DLDFLAGS="${LIBRUBY_DLDFLAGS}"' -Wl,--out-implib=$(LIBRUBY)'
LIBRUBY_DLDFLAGS="${DLDFLAGS}"' -Wl,--out-implib=$(LIBRUBY)'
AS_CASE(["$target_os"],
[cygwin*], [
AS_IF([test x"$enable_shared" = xyes], [