Add compressed debug section support to binutils and ld.

bfd/

2010-10-29  H.J. Lu  <hongjiu.lu@intel.com>
	    Cary Coutant  <ccoutant@google.com>

	* archive.c (bfd_openr_next_archived_file): Copy BFD_COMPRESS
	and BFD_DECOMPRESS.

	* bfd.c (BFD_COMPRESS): New.
	(BFD_DECOMPRESS): Likewise.
	(BFD_FLAGS_SAVED): Likewise.
	(bfd_preserve_save): Replace BFD_IN_MEMORY with BFD_FLAGS_SAVED.

	* compress.c (bfd_uncompress_section_contents): Removed.
	(get_uncompressed_size): New.
	(decompress_contents): Likewise.
	(bfd_compress_section_contents): Likewise.
	(bfd_get_full_section_contents): Likewise.
	(bfd_is_section_compressed): Likewise.
	(bfd_init_section_decompress_status): Likewise.
	(bfd_init_section_compress_status): Likewise.

	* dwarf2.c (dwarf_debug_sections): New.
	(dwarf_debug_section_enum): Likewise.
	(read_section): Remove section_name and compressed_section_name.
	Add dwarf_debug_section_enum.  Try compressed debug section.
	(read_indirect_string): Updated.
	(read_abbrevs): Likewise.
	(decode_line_info): Likewise.
	(read_debug_ranges): Likewise.
	(find_line): Updated.

	* ecoff.c (bfd_debug_section): Add compress_status and
	compressed_size.

	* elf.c (_bfd_elf_make_section_from_shdr): Call
	bfd_is_section_compressed to check if a DWARF debug section is
	compressed.  Call bfd_init_section_compress_status or
	bfd_init_section_decompress_status if needed.

	* elflink.c (elf_link_input_bfd): Replace bfd_get_section_contents
	with bfd_get_full_section_contents.
	* merge.c (_bfd_add_merge_section): Likewise.
	* reloc.c (bfd_generic_get_relocated_section_contents): Likewise.
	* simple.c (bfd_simple_get_relocated_section_contents): Likewise.

	* elfxx-target.h (TARGET_BIG_SYM): Allow BFD_COMPRESS and
	BFD_DECOMPRESS.
	(TARGET_LITTLE_SYM): Likewise.

	* libbfd-in.h (dwarf_debug_section): New.
	(dwarf_debug_sections): Likewise.

	* libbfd.c (_bfd_generic_get_section_contents): Issue an error
	when getting contents on compressed/decompressed section.

	* section.c (COMPRESS_SECTION_NONE): New.
	(COMPRESS_SECTION_DONE): Likewise.
	(DECOMPRESS_SECTION_SIZED): Likewise.
	(BFD_FAKE_SECTION): Add compress_status and compressed_size.
	(bfd_malloc_and_get_section): Replace bfd_get_section_contents
	with bfd_get_full_section_contents.

	* bfd-in2.h: Regenerated.
	* libbfd.h: Likewise.

binutils/

2010-10-29  H.J. Lu  <hongjiu.lu@intel.com>

	* addr2line.c (process_file): Set BFD_DECOMPRESS.

	* objcopy.c (do_debug_sections): New.
	(OPTION_COMPRESS_DEBUG_SECTIONS): New.
	(OPTION_DECOMPRESS_DEBUG_SECTIONS): Likewise.
	(copy_options): Add OPTION_COMPRESS_DEBUG_SECTIONS and
	OPTION_DECOMPRESS_DEBUG_SECTIONS.
	(copy_usage): Add --compress-debug-sections and
	--decompress-debug-sections.
	(copy_file): Set BFD_COMPRESS or BFD_DECOMPRESS.
	(copy_section): Replace bfd_get_section_contents with
	bfd_get_full_section_contents.
	(copy_main): Handle OPTION_COMPRESS_DEBUG_SECTIONS and
	OPTION_DECOMPRESS_DEBUG_SECTIONS.  Check do_debug_sections to
	rename DWARF debug sections.

	* objdump.c (load_specific_debug_section): Replace
	bfd_get_section_contents with bfd_get_full_section_contents.
	Remove bfd_uncompress_section_contents.
	(dump_section): Replace bfd_get_section_contents with
	bfd_get_full_section_contents.
	(display_file): Set BFD_DECOMPRESS if needed.

	* readelf.c (uncompress_section_contents): Set buffer to NULL
	to indiate decompression failure.
	(load_specific_debug_section): Always call
	uncompress_section_contents.

	* doc/binutils.texi: Document --compress-debug-sections and
	--decompress-debug-sections.

binutils/testsuite/

2010-10-29  H.J. Lu  <hongjiu.lu@intel.com>

	* binutils-all/compress.exp: New.
	* binutils-all/dw2-1.S: Likewise.
	* binutils-all/dw2-2.S: Likewise.
	* binutils-all/libdw2-compressed.out: Likewise.
	* binutils-all/libdw2.out: Likewise.

gas/

2010-10-29  H.J. Lu  <hongjiu.lu@intel.com>

	* write.c (compress_debug): Optimize section flags check.

gas/testsuite/

2010-10-29  H.J. Lu  <hongjiu.lu@intel.com>

	* elf/dwarf2-1.s: Replace .zdebug_abbrev section with
	.debug_abbrev section.
	* elf/dwarf2-2.3: Likewise.

	* elf/dwarf2-1.d: Pass --compress-debug-sections to assembler.
	Updated.
	* elf/dwarf2-2.d: Likewise.

	* gas/i386/i386.exp: Remove xfail on dw2-compress-2 and
	x86-64-dw2-compress-2.

ld/

2010-10-29  H.J. Lu  <hongjiu.lu@intel.com>

	* ldfile.c (ldfile_try_open_bfd): Set BFD_DECOMPRESS after
	bfd_openr returns.
	* emultempl/elf32.em (gld${EMULATION_NAME}_try_needed): Likewise.

	* scripttempl/elf.sc: Include compressed DWARF debug sections.

ld/testsuite/

2010-10-29  H.J. Lu  <hongjiu.lu@intel.com>

	* ld-elf/compress.exp: New.
	* ld-elf/compress1.s: Likewise.
	* ld-elf/compress1a.d: Likewise.
	* ld-elf/compress1b.d: Likewise.
	* ld-elf/compress1c.d: Likewise.

1 files changed, 53 insertions, 2 deletions

diff --git a/binutils/objcopy.c b/binutils/objcopy.c
index 84b9feb..2077fca 100644
--- a/binutils/objcopy.c
+++ b/binutils/objcopy.c
@@ -194,6 +194,14 @@ static const char * gnu_debuglink_filename = NULL;
 /* Whether to convert debugging information.  */
 static bfd_boolean convert_debugging = FALSE;
 
+/* Whether to compress/decompress DWARF debug sections.  */
+static enum
+{
+  nothing,
+  compress,
+  decompress
+} do_debug_sections = nothing;
+
 /* Whether to change the leading character in symbol names.  */
 static bfd_boolean change_leading_char = FALSE;
 
@@ -259,7 +267,9 @@ enum command_line_switch
     OPTION_CHANGE_SECTION_LMA,
     OPTION_CHANGE_SECTION_VMA,
     OPTION_CHANGE_WARNINGS,
+    OPTION_COMPRESS_DEBUG_SECTIONS,
     OPTION_DEBUGGING,
+    OPTION_DECOMPRESS_DEBUG_SECTIONS,
     OPTION_GAP_FILL,
     OPTION_NO_CHANGE_WARNINGS,
     OPTION_PAD_TO,
@@ -357,7 +367,9 @@ static struct option copy_options[] =
   {"change-section-vma", required_argument, 0, OPTION_CHANGE_SECTION_VMA},
   {"change-start", required_argument, 0, OPTION_CHANGE_START},
   {"change-warnings", no_argument, 0, OPTION_CHANGE_WARNINGS},
+  {"compress-debug-sections", no_argument, 0, OPTION_COMPRESS_DEBUG_SECTIONS},
   {"debugging", no_argument, 0, OPTION_DEBUGGING},
+  {"decompress-debug-sections", no_argument, 0, OPTION_DECOMPRESS_DEBUG_SECTIONS},
   {"discard-all", no_argument, 0, 'x'},
   {"discard-locals", no_argument, 0, 'X'},
   {"extract-symbol", no_argument, 0, OPTION_EXTRACT_SYMBOL},
@@ -551,6 +563,8 @@ copy_usage (FILE *stream, int exit_status)
                                    <commit>\n\
      --subsystem <name>[:<version>]\n\
                                    Set PE subsystem to <name> [& <version>]\n\
+     --compress-debug-sections     Compress DWARF debug sections using zlib\n\
+     --decompress-debug-sections   Decompress DWARF debug sections using zlib\n\
   -v --verbose                     List all object files modified\n\
   @<file>                          Read options from <file>\n\
   -V --version                     Display this program's version number\n\
@@ -2193,6 +2207,18 @@ copy_file (const char *input_filename, const char *output_filename,
       return;
     }
 
+  switch (do_debug_sections)
+    {
+    case compress:
+      ibfd->flags |= BFD_COMPRESS;
+      break;
+    case decompress:
+      ibfd->flags |= BFD_DECOMPRESS;
+      break;
+    default:
+      break;
+    }
+
   if (bfd_check_format (ibfd, bfd_archive))
     {
       bfd_boolean force_output_target;
@@ -2637,9 +2663,9 @@ copy_section (bfd *ibfd, sec_ptr isection, void *obfdarg)
   if (bfd_get_section_flags (ibfd, isection) & SEC_HAS_CONTENTS
       && bfd_get_section_flags (obfd, osection) & SEC_HAS_CONTENTS)
     {
-      void *memhunk = xmalloc (size);
+      bfd_byte *memhunk = NULL;
 
-      if (!bfd_get_section_contents (ibfd, isection, memhunk, 0, size))
+      if (!bfd_get_full_section_contents (ibfd, isection, &memhunk))
 	{
 	  status = 1;
 	  bfd_nonfatal_message (NULL, ibfd, isection, NULL);
@@ -3170,6 +3196,7 @@ copy_main (int argc, char *argv[])
   struct section_list *p;
   struct stat statbuf;
   const bfd_arch_info_type *input_arch = NULL;
+  struct dwarf_debug_section *d;
 
   while ((c = getopt_long (argc, argv, "b:B:i:I:j:K:N:s:O:d:F:L:G:R:SpgxXHhVvW:w",
 			   copy_options, (int *) 0)) != EOF)
@@ -3462,10 +3489,18 @@ copy_main (int argc, char *argv[])
 	  change_leading_char = TRUE;
 	  break;
 
+	case OPTION_COMPRESS_DEBUG_SECTIONS:
+	  do_debug_sections = compress;
+	  break;
+
 	case OPTION_DEBUGGING:
 	  convert_debugging = TRUE;
 	  break;
 
+	case OPTION_DECOMPRESS_DEBUG_SECTIONS:
+	  do_debug_sections = decompress;
+	  break;
+
 	case OPTION_GAP_FILL:
 	  {
 	    bfd_vma gap_fill_vma;
@@ -3877,6 +3912,22 @@ copy_main (int argc, char *argv[])
     fatal (_("warning: could not create temporary file whilst copying '%s', (error: %s)"),
 	   input_filename, strerror (errno));
 
+  switch (do_debug_sections)
+    {
+    case compress:
+      for (d = dwarf_debug_sections; d->uncompressed_name; d++)
+	add_section_rename (d->uncompressed_name, d->compressed_name,
+			    (flagword) -1);
+      break;
+    case decompress:
+      for (d = dwarf_debug_sections; d->uncompressed_name; d++)
+	add_section_rename (d->compressed_name, d->uncompressed_name,
+			    (flagword) -1);
+      break;
+    default:
+      break;
+    }
+
   copy_file (input_filename, tmpname, input_target, output_target, input_arch);
   if (status == 0)
     {