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authorFangrui Song <maskray@google.com>2022-09-26 19:50:13 -0700
committerFangrui Song <i@maskray.me>2022-09-26 19:50:13 -0700
commit2cac01e3ffff74898c54fa5e6418817f5578adb6 (patch)
treec0209ba03d922dae339056488493fc16ebefe6d0 /gas/compress-debug.c
parente122316b7ce78b999db944d7b524e11d642e2a49 (diff)
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binutils, gdb: support zstd compressed debug sections
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 ... ```
Diffstat (limited to 'gas/compress-debug.c')
-rw-r--r--gas/compress-debug.c60
1 files changed, 51 insertions, 9 deletions
diff --git a/gas/compress-debug.c b/gas/compress-debug.c
index c80dbee..3cd175f 100644
--- a/gas/compress-debug.c
+++ b/gas/compress-debug.c
@@ -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);