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, 82 insertions, 92 deletions

diff --git a/bfd/dwarf2.c b/bfd/dwarf2.c
index 1285833..e5d0103 100644
--- a/bfd/dwarf2.c
+++ b/bfd/dwarf2.c
@@ -275,6 +275,60 @@ struct attr_abbrev
   enum dwarf_form form;
 };
 
+/* Map of uncompressed DWARF debug section name to compressed one.  It
+   is terminated by NULL uncompressed_name.  */
+
+struct dwarf_debug_section dwarf_debug_sections[] =
+{
+  { ".debug_abbrev",		".zdebug_abbrev" },
+  { ".debug_aranges",		".zdebug_aranges" },
+  { ".debug_frame",		".zdebug_frame" },
+  { ".debug_info",		".zdebug_info" },
+  { ".debug_line",		".zdebug_line" },
+  { ".debug_loc",		".zdebug_loc" },
+  { ".debug_macinfo",		".zdebug_macinfo" },
+  { ".debug_pubnames",		".zdebug_pubnames" },
+  { ".debug_pubtypes",		".zdebug_pubtypes" },
+  { ".debug_ranges",		".zdebug_ranges" },
+  { ".debug_static_func",	".zdebug_static_func" },
+  { ".debug_static_vars",	".zdebug_static_vars" },
+  { ".debug_str",		".zdebug_str", },
+  { ".debug_types",		".zdebug_types" },
+  /* GNU DWARF 1 extensions */
+  { ".debug_sfnames",		".zdebug_sfnames" },
+  { ".debug_srcinfo",		".zebug_srcinfo" },
+  /* SGI/MIPS DWARF 2 extensions */
+  { ".debug_funcnames",		".zdebug_funcnames" },
+  { ".debug_typenames",		".zdebug_typenames" },
+  { ".debug_varnames",		".zdebug_varnames" },
+  { ".debug_weaknames",		".zdebug_weaknames" },
+  { NULL,			NULL },
+};
+
+enum dwarf_debug_section_enum
+{
+  debug_abbrev = 0,
+  debug_aranges,
+  debug_frame,
+  debug_info,
+  debug_line,
+  debug_loc,
+  debug_macinfo,
+  debug_pubnames,
+  debug_pubtypes,
+  debug_ranges,
+  debug_static_func,
+  debug_static_vars,
+  debug_str,
+  debug_types,
+  debug_sfnames,
+  debug_srcinfo,
+  debug_funcnames,
+  debug_typenames,
+  debug_varnames,
+  debug_weaknames
+};
+
 #ifndef ABBREV_HASH_SIZE
 #define ABBREV_HASH_SIZE 121
 #endif
@@ -413,24 +467,23 @@ lookup_info_hash_table (struct info_hash_table *hash_table, const char *key)
 
 static bfd_boolean
 read_section (bfd *           abfd,
-	      const char *    section_name,
-	      const char *    compressed_section_name,
+	      enum dwarf_debug_section_enum sec,
 	      asymbol **      syms,
 	      bfd_uint64_t    offset,
 	      bfd_byte **     section_buffer,
 	      bfd_size_type * section_size)
 {
   asection *msec;
-  bfd_boolean section_is_compressed = FALSE;
+  const char *section_name = dwarf_debug_sections[sec].uncompressed_name;
 
   /* read_section is a noop if the section has already been read.  */
   if (!*section_buffer)
     {
       msec = bfd_get_section_by_name (abfd, section_name);
-      if (! msec && compressed_section_name)
+      if (! msec)
 	{
-	  msec = bfd_get_section_by_name (abfd, compressed_section_name);
-	  section_is_compressed = TRUE;
+	  section_name = dwarf_debug_sections[sec].compressed_name;
+	  msec = bfd_get_section_by_name (abfd, section_name);
 	}
       if (! msec)
 	{
@@ -456,16 +509,6 @@ read_section (bfd *           abfd,
 					  0, *section_size))
 	    return FALSE;
 	}
-
-      if (section_is_compressed)
-	{
-	  if (! bfd_uncompress_section_contents (section_buffer, section_size))
-	    {
-	      (*_bfd_error_handler) (_("Dwarf Error: unable to decompress %s section."), compressed_section_name);
-	      bfd_set_error (bfd_error_bad_value);
-	      return FALSE;
-	    }
-	}
     }
 
   /* It is possible to get a bad value for the offset into the section
@@ -561,8 +604,7 @@ read_indirect_string (struct comp_unit * unit,
 
   *bytes_read_ptr = unit->offset_size;
 
-  if (! read_section (unit->abfd, ".debug_str", ".zdebug_str",
-		      stash->syms, offset,
+  if (! read_section (unit->abfd, debug_str, stash->syms, offset,
 		      &stash->dwarf_str_buffer, &stash->dwarf_str_size))
     return NULL;
 
@@ -644,8 +686,7 @@ read_abbrevs (bfd *abfd, bfd_uint64_t offset, struct dwarf2_debug *stash)
   unsigned int abbrev_form, hash_number;
   bfd_size_type amt;
 
-  if (! read_section (abfd, ".debug_abbrev", ".zdebug_abbrev",
-		      stash->syms, offset,
+  if (! read_section (abfd, debug_abbrev, stash->syms, offset,
 		      &stash->dwarf_abbrev_buffer, &stash->dwarf_abbrev_size))
     return NULL;
 
@@ -1353,8 +1394,7 @@ decode_line_info (struct comp_unit *unit, struct dwarf2_debug *stash)
   unsigned char op_code, extended_op, adj_opcode;
   bfd_size_type amt;
 
-  if (! read_section (abfd, ".debug_line", ".zdebug_line",
-		      stash->syms, unit->line_offset,
+  if (! read_section (abfd, debug_line, stash->syms, unit->line_offset,
 		      &stash->dwarf_line_buffer, &stash->dwarf_line_size))
     return NULL;
 
@@ -1769,8 +1809,7 @@ static bfd_boolean
 read_debug_ranges (struct comp_unit *unit)
 {
   struct dwarf2_debug *stash = unit->stash;
-  return read_section (unit->abfd, ".debug_ranges", ".zdebug_ranges",
-		       stash->syms, 0,
+  return read_section (unit->abfd, debug_ranges, stash->syms, 0,
 		       &stash->dwarf_ranges_buffer, &stash->dwarf_ranges_size);
 }
 
@@ -3192,86 +3231,37 @@ find_line (bfd *abfd,
 	{
 	  /* Case 1: only one info section.  */
 	  total_size = msec->size;
-	  if (! read_section (debug_bfd, ".debug_info", ".zdebug_info",
-			      symbols, 0,
+	  if (! read_section (debug_bfd, debug_info, symbols, 0,
 			      &stash->info_ptr_memory, &total_size))
 	    goto done;
 	}
       else
 	{
-	  int all_uncompressed = 1;
+	  /* Case 2: multiple sections.  */
 	  for (total_size = 0; msec; msec = find_debug_info (debug_bfd, msec))
-	    {
-	      total_size += msec->size;
-	      if (strcmp (msec->name, DWARF2_COMPRESSED_DEBUG_INFO) == 0)
-		all_uncompressed = 0;
-	    }
-	  if (all_uncompressed)
-	    {
-	      /* Case 2: multiple sections, but none is compressed.  */
-	      stash->info_ptr_memory = (bfd_byte *) bfd_malloc (total_size);
-	      if (stash->info_ptr_memory == NULL)
-		goto done;
-
-	      total_size = 0;
-	      for (msec = find_debug_info (debug_bfd, NULL);
-		   msec;
-		   msec = find_debug_info (debug_bfd, msec))
-		{
-		  bfd_size_type size;
-
-		  size = msec->size;
-		  if (size == 0)
-		    continue;
+	    total_size += msec->size;
 
-		  if (!(bfd_simple_get_relocated_section_contents
-			(debug_bfd, msec, stash->info_ptr_memory + total_size,
-			 symbols)))
-		    goto done;
+	  stash->info_ptr_memory = (bfd_byte *) bfd_malloc (total_size);
+	  if (stash->info_ptr_memory == NULL)
+	    goto done;
 
-		  total_size += size;
-		}
-	    }
-	  else
+	  total_size = 0;
+	  for (msec = find_debug_info (debug_bfd, NULL);
+	       msec;
+	       msec = find_debug_info (debug_bfd, msec))
 	    {
-	      /* Case 3: multiple sections, some or all compressed.  */
-	      stash->info_ptr_memory = NULL;
-	      total_size = 0;
-	      for (msec = find_debug_info (debug_bfd, NULL);
-		   msec;
-		   msec = find_debug_info (debug_bfd, msec))
-		{
-		  bfd_size_type size = msec->size;
-		  bfd_byte *buffer, *tmp;
+	      bfd_size_type size;
 
-		  if (size == 0)
-		    continue;
+	      size = msec->size;
+	      if (size == 0)
+		continue;
 
-		  buffer = (bfd_simple_get_relocated_section_contents
-			    (debug_bfd, msec, NULL, symbols));
-		  if (! buffer)
-		    goto done;
+	      if (!(bfd_simple_get_relocated_section_contents
+		    (debug_bfd, msec, stash->info_ptr_memory + total_size,
+		     symbols)))
+		goto done;
 
-		  if (strcmp (msec->name, DWARF2_COMPRESSED_DEBUG_INFO) == 0)
-		    {
-		      if (! bfd_uncompress_section_contents (&buffer, &size))
-			{
-			  free (buffer);
-			  goto done;
-			}
-		    }
-		  tmp = (bfd_byte *) bfd_realloc (stash->info_ptr_memory,
-						  total_size + size);
-		  if (tmp == NULL)
-		    {
-		      free (buffer);
-		      goto done;
-		    }
-		  stash->info_ptr_memory = tmp;
-		  memcpy (stash->info_ptr_memory + total_size, buffer, size);
-		  free (buffer);
-		  total_size += size;
-		}
+	      total_size += size;
 	    }
 	}