From 96109726a4d048e59ef11a27264fbe0f47c34690 Mon Sep 17 00:00:00 2001 From: Cary Coutant Date: Tue, 8 May 2012 17:49:36 +0000 Subject: [PATCH] binutils/ * doc/binutils.texi (objcopy): Add --strip-dwo, --extract-dwo options. (strip): Add --strip-dwo option. * objcopy.c (enum strip_action): Add STRIP_DWO, STRIP_NONDWO. (enum command_line_switch): Add OPTION_EXTRACT_DWO, OPTION_STRIP_DWO. (strip_options): Add --strip-dwo option. (copy_options): Add --extract-dwo, --strip-dwo options. (copy_usage): Likewise. (strip_usage): Add --strip-dwo option. (is_dwo_section): New function. (is_strip_section_1): Check for DWO sections. (copy_object): Check for --strip-dwo, --extract-dwo options. (copy_relocations_in_section): Discard relocations for DWO sections. Discard entire relocation section when no relocations. (strip_main): Add --strip-dwo option. (copy_main): Add --strip-dwo, --extract-dwo options. --- binutils/ChangeLog | 18 ++++++++++++++++ binutils/doc/binutils.texi | 24 ++++++++++++++++++++++ binutils/objcopy.c | 51 ++++++++++++++++++++++++++++++++++++++++++---- 3 files changed, 89 insertions(+), 4 deletions(-) diff --git a/binutils/ChangeLog b/binutils/ChangeLog index a08836d..a71190e 100644 --- a/binutils/ChangeLog +++ b/binutils/ChangeLog @@ -1,3 +1,21 @@ +2012-05-08 Cary Coutant + + * doc/binutils.texi (objcopy): Add --strip-dwo, --extract-dwo options. + (strip): Add --strip-dwo option. + * objcopy.c (enum strip_action): Add STRIP_DWO, STRIP_NONDWO. + (enum command_line_switch): Add OPTION_EXTRACT_DWO, OPTION_STRIP_DWO. + (strip_options): Add --strip-dwo option. + (copy_options): Add --extract-dwo, --strip-dwo options. + (copy_usage): Likewise. + (strip_usage): Add --strip-dwo option. + (is_dwo_section): New function. + (is_strip_section_1): Check for DWO sections. + (copy_object): Check for --strip-dwo, --extract-dwo options. + (copy_relocations_in_section): Discard relocations for DWO sections. + Discard entire relocation section when no relocations. + (strip_main): Add --strip-dwo option. + (copy_main): Add --strip-dwo, --extract-dwo options. + 2012-05-08 Alan Modra * Makefile.am (check_DEJAGNU): Export LC_ALL=C in place of other diff --git a/binutils/doc/binutils.texi b/binutils/doc/binutils.texi index b90d4f6..daa191a 100644 --- a/binutils/doc/binutils.texi +++ b/binutils/doc/binutils.texi @@ -1094,6 +1094,8 @@ objcopy [@option{-F} @var{bfdname}|@option{--target=}@var{bfdname}] [@option{--add-gnu-debuglink=}@var{path-to-file}] [@option{--keep-file-symbols}] [@option{--only-keep-debug}] + [@option{--strip-dwo}] + [@option{--extract-dwo}] [@option{--extract-symbol}] [@option{--writable-text}] [@option{--readonly-text}] @@ -1664,6 +1666,21 @@ currently only supports the presence of one filename containing debugging information, not multiple filenames on a one-per-object-file basis. +@item --strip-dwo +Remove the contents of all DWARF .dwo sections, leaving the +remaining debugging sections and all symbols intact. +This option is intended for use by the compiler as part of +the @option{-gsplit-dwarf} option, which splits debug information +between the .o file and a separate .dwo file. The compiler +generates all debug information in the same file, then uses +the @option{--extract-dwo} option to copy the .dwo sections to +the .dwo file, then the @option{--strip-dwo} option to remove +those sections from the original .o file. + +@item --extract-dwo +Extract the contents of all DWARF .dwo sections. See the +@option{--strip-dwo} option for more information. + @item --file-alignment @var{num} Specify the file alignment. Sections in the file will always begin at file offsets which are multiples of this number. This defaults to @@ -2680,6 +2697,7 @@ strip [@option{-F} @var{bfdname} |@option{--target=}@var{bfdname}] [@option{-O} @var{bfdname} |@option{--output-target=}@var{bfdname}] [@option{-s}|@option{--strip-all}] [@option{-S}|@option{-g}|@option{-d}|@option{--strip-debug}] + [@option{--strip-dwo}] [@option{-K} @var{symbolname} |@option{--keep-symbol=}@var{symbolname}] [@option{-N} @var{symbolname} |@option{--strip-symbol=}@var{symbolname}] [@option{-w}|@option{--wildcard}] @@ -2748,6 +2766,12 @@ Remove all symbols. @itemx --strip-debug Remove debugging symbols only. +@item --strip-dwo +Remove the contents of all DWARF .dwo sections, leaving the +remaining debugging sections and all symbols intact. +See the description of this option in the @command{objcopy} section +for more information. + @item --strip-unneeded Remove all symbols that are not needed for relocation processing. diff --git a/binutils/objcopy.c b/binutils/objcopy.c index bd93d00..40250ad 100644 --- a/binutils/objcopy.c +++ b/binutils/objcopy.c @@ -96,6 +96,8 @@ enum strip_action STRIP_DEBUG, /* Strip all debugger symbols. */ STRIP_UNNEEDED, /* Strip unnecessary symbols. */ STRIP_NONDEBUG, /* Strip everything but debug info. */ + STRIP_DWO, /* Strip all DWO info. */ + STRIP_NONDWO, /* Strip everything but DWO info. */ STRIP_ALL /* Strip all symbols. */ }; @@ -314,7 +316,9 @@ enum command_line_switch OPTION_SECTION_ALIGNMENT, OPTION_STACK, OPTION_INTERLEAVE_WIDTH, - OPTION_SUBSYSTEM + OPTION_SUBSYSTEM, + OPTION_EXTRACT_DWO, + OPTION_STRIP_DWO }; /* Options to handle if running as "strip". */ @@ -339,6 +343,7 @@ static struct option strip_options[] = {"remove-section", required_argument, 0, 'R'}, {"strip-all", no_argument, 0, 's'}, {"strip-debug", no_argument, 0, 'S'}, + {"strip-dwo", no_argument, 0, OPTION_STRIP_DWO}, {"strip-unneeded", no_argument, 0, OPTION_STRIP_UNNEEDED}, {"strip-symbol", required_argument, 0, 'N'}, {"target", required_argument, 0, 'F'}, @@ -374,6 +379,7 @@ static struct option copy_options[] = {"discard-all", no_argument, 0, 'x'}, {"discard-locals", no_argument, 0, 'X'}, {"enable-deterministic-archives", no_argument, 0, 'D'}, + {"extract-dwo", no_argument, 0, OPTION_EXTRACT_DWO}, {"extract-symbol", no_argument, 0, OPTION_EXTRACT_SYMBOL}, {"format", required_argument, 0, 'F'}, /* Obsolete */ {"gap-fill", required_argument, 0, OPTION_GAP_FILL}, @@ -420,6 +426,7 @@ static struct option copy_options[] = {"srec-forceS3", no_argument, 0, OPTION_SREC_FORCES3}, {"strip-all", no_argument, 0, 'S'}, {"strip-debug", no_argument, 0, 'g'}, + {"strip-dwo", no_argument, 0, OPTION_STRIP_DWO}, {"strip-unneeded", no_argument, 0, OPTION_STRIP_UNNEEDED}, {"strip-unneeded-symbol", required_argument, 0, OPTION_STRIP_UNNEEDED_SYMBOL}, {"strip-unneeded-symbols", required_argument, 0, OPTION_STRIP_UNNEEDED_SYMBOLS}, @@ -490,12 +497,14 @@ copy_usage (FILE *stream, int exit_status) -R --remove-section Remove section from the output\n\ -S --strip-all Remove all symbol and relocation information\n\ -g --strip-debug Remove all debugging symbols & sections\n\ + --strip-dwo Remove all DWO sections\n\ --strip-unneeded Remove all symbols not needed by relocations\n\ -N --strip-symbol Do not copy symbol \n\ --strip-unneeded-symbol \n\ Do not copy symbol unless needed by\n\ relocations\n\ --only-keep-debug Strip everything but the debug information\n\ + --extract-dwo Copy only DWO sections\n\ --extract-symbol Remove section contents but keep symbols\n\ -K --keep-symbol Do not strip symbol \n\ --keep-file-symbols Do not strip file symbol(s)\n\ @@ -598,6 +607,7 @@ strip_usage (FILE *stream, int exit_status) -R --remove-section= Remove section from the output\n\ -s --strip-all Remove all symbol and relocation information\n\ -g -S -d --strip-debug Remove all debugging symbols & sections\n\ + --strip-dwo Remove all DWO sections\n\ --strip-unneeded Remove all symbols not needed by relocations\n\ --only-keep-debug Strip everything but the debug information\n\ -N --strip-symbol= Do not copy symbol \n\ @@ -932,6 +942,17 @@ group_signature (asection *group) return NULL; } +/* Return TRUE if the section is a DWO section. */ + +static bfd_boolean +is_dwo_section (bfd *abfd ATTRIBUTE_UNUSED, asection *sec) +{ + const char *name = bfd_get_section_name (abfd, sec); + int len = strlen (name); + + return strncmp (name + len - 4, ".dwo", 4) == 0; +} + /* See if a non-group section is being removed. */ static bfd_boolean @@ -958,10 +979,16 @@ is_strip_section_1 (bfd *abfd ATTRIBUTE_UNUSED, asection *sec) || convert_debugging) return TRUE; + if (strip_symbols == STRIP_DWO) + return is_dwo_section (abfd, sec); + if (strip_symbols == STRIP_NONDEBUG) return FALSE; } + if (strip_symbols == STRIP_NONDWO) + return !is_dwo_section (abfd, sec); + return FALSE; } @@ -1849,6 +1876,8 @@ copy_object (bfd *ibfd, bfd *obfd, const bfd_arch_info_type *input_arch) || strip_symbols == STRIP_ALL || strip_symbols == STRIP_UNNEEDED || strip_symbols == STRIP_NONDEBUG + || strip_symbols == STRIP_DWO + || strip_symbols == STRIP_NONDWO || discard_locals != LOCALS_UNDEF || localize_hidden || htab_elements (strip_specific_htab) != 0 @@ -2656,8 +2685,8 @@ copy_relocations_in_section (bfd *ibfd, sec_ptr isection, void *obfdarg) osection = isection->output_section; - /* Core files do not need to be relocated. */ - if (bfd_get_format (obfd) == bfd_core) + /* Core files and DWO files do not need to be relocated. */ + if (bfd_get_format (obfd) == bfd_core || strip_symbols == STRIP_NONDWO) relsize = 0; else { @@ -2678,7 +2707,10 @@ copy_relocations_in_section (bfd *ibfd, sec_ptr isection, void *obfdarg) } if (relsize == 0) - bfd_set_reloc (obfd, osection, NULL, 0); + { + bfd_set_reloc (obfd, osection, NULL, 0); + osection->flags &= ~SEC_RELOC; + } else { relpp = (arelent **) xmalloc (relsize); @@ -3022,6 +3054,9 @@ strip_main (int argc, char *argv[]) case 'd': /* Historic BSD alias for -g. Used by early NetBSD. */ strip_symbols = STRIP_DEBUG; break; + case OPTION_STRIP_DWO: + strip_symbols = STRIP_DWO; + break; case OPTION_STRIP_UNNEEDED: strip_symbols = STRIP_UNNEEDED; break; @@ -3352,6 +3387,10 @@ copy_main (int argc, char *argv[]) strip_symbols = STRIP_DEBUG; break; + case OPTION_STRIP_DWO: + strip_symbols = STRIP_DWO; + break; + case OPTION_STRIP_UNNEEDED: strip_symbols = STRIP_UNNEEDED; break; @@ -3813,6 +3852,10 @@ copy_main (int argc, char *argv[]) bfd_flags_to_set &= ~D_PAGED; break; + case OPTION_EXTRACT_DWO: + strip_symbols = STRIP_NONDWO; + break; + case OPTION_EXTRACT_SYMBOL: extract_symbol = TRUE; break; -- 2.7.4