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binutils, gdb: support zstd compressed debug sections

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PR29397 PR29563: Add new configure option --with-zstd which defaults to
auto.  If pkgconfig/libzstd.pc is found, define HAVE_ZSTD and support
zstd compressed debug sections for most tools.

* bfd: for addr2line, objdump --dwarf, gdb, etc
* gas: support --compress-debug-sections=zstd
* ld: support ELFCOMPRESS_ZSTD input and --compress-debug-sections=zstd
* objcopy: support ELFCOMPRESS_ZSTD input for
  --decompress-debug-sections and --compress-debug-sections=zstd
* gdb: support ELFCOMPRESS_ZSTD input.  The bfd change references zstd
  symbols, so gdb has to link against -lzstd in this patch.

If zstd is not supported, ELFCOMPRESS_ZSTD input triggers an error.  We
can avoid HAVE_ZSTD if binutils-gdb imports zstd/ like zlib/, but this
is too heavyweight, so don't do it for now.

```
% ld/ld-new a.o
ld/ld-new: a.o: section .debug_abbrev is compressed with zstd, but BFD is not built with zstd support
...

% ld/ld-new a.o --compress-debug-sections=zstd
ld/ld-new: --compress-debug-sections=zstd: ld is not built with zstd support

% binutils/objcopy --compress-debug-sections=zstd a.o b.o
binutils/objcopy: --compress-debug-sections=zstd: binutils is not built with zstd support

% binutils/objcopy b.o --decompress-debug-sections
binutils/objcopy: zstd.o: section .debug_abbrev is compressed with zstd, but BFD is not built with zstd support
...
```
This commit is contained in:
Fangrui Song
2022-09-26 19:50:13 -07:00
committed by Fangrui Song
parent e122316b7c
commit 2cac01e3ff
56 changed files with 1490 additions and 254 deletions
Download Patch File Download Diff File Expand all files Collapse all files

60
gas/compress-debug.c
View File

@ -21,14 +21,23 @@
#include "config.h"
#include <stdio.h>
#include <zlib.h>
#if HAVE_ZSTD
#include <zstd.h>
#endif
#include "ansidecl.h"
#include "compress-debug.h"
/* Initialize the compression engine. */
struct z_stream_s *
compress_init (void)
void *
compress_init (bool use_zstd)
{
if (use_zstd) {
#if HAVE_ZSTD
return ZSTD_createCCtx ();
#endif
}
static struct z_stream_s strm;
strm.zalloc = NULL;
@ -42,22 +51,37 @@ compress_init (void)
from the engine goes into the current frag on the obstack. */
int
compress_data (struct z_stream_s *strm, const char **next_in,
int *avail_in, char **next_out, int *avail_out)
compress_data (bool use_zstd, void *ctx, const char **next_in, int *avail_in,
char **next_out, int *avail_out)
{
int out_size = 0;
int x;
if (use_zstd)
{
#if HAVE_ZSTD
ZSTD_outBuffer ob = { *next_out, *avail_out, 0 };
ZSTD_inBuffer ib = { *next_in, *avail_in, 0 };
size_t ret = ZSTD_compressStream2 (ctx, &ob, &ib, ZSTD_e_continue);
*next_in += ib.pos;
*avail_in -= ib.pos;
*next_out += ob.pos;
*avail_out -= ob.pos;
if (ZSTD_isError (ret))
return -1;
return (int)ob.pos;
#endif
}
struct z_stream_s *strm = ctx;
strm->next_in = (Bytef *) (*next_in);
strm->avail_in = *avail_in;
strm->next_out = (Bytef *) (*next_out);
strm->avail_out = *avail_out;
x = deflate (strm, Z_NO_FLUSH);
int x = deflate (strm, Z_NO_FLUSH);
if (x != Z_OK)
return -1;
out_size = *avail_out - strm->avail_out;
int out_size = *avail_out - strm->avail_out;
*next_in = (char *) (strm->next_in);
*avail_in = strm->avail_in;
*next_out = (char *) (strm->next_out);
@ -71,10 +95,28 @@ compress_data (struct z_stream_s *strm, const char **next_in,
needed. */
int
compress_finish (struct z_stream_s *strm, char **next_out,
compress_finish (bool use_zstd, void *ctx, char **next_out,
int *avail_out, int *out_size)
{
if (use_zstd)
{
#if HAVE_ZSTD
ZSTD_outBuffer ob = { *next_out, *avail_out, 0 };
ZSTD_inBuffer ib = { 0 };
size_t ret = ZSTD_compressStream2 (ctx, &ob, &ib, ZSTD_e_end);
*out_size = ob.pos;
*next_out += ob.pos;
*avail_out -= ob.pos;
if (ZSTD_isError (ret))
return -1;
if (ret == 0)
ZSTD_freeCCtx (ctx);
return ret ? 1 : 0;
#endif
}
int x;
struct z_stream_s *strm = ctx;
strm->avail_in = 0;
strm->next_out = (Bytef *) (*next_out);