ChangeLog:

2010-10-07  Dave Korn  <dave.korn.cygwin@gmail.com>

	* configure.ac (build_lto_plugin): New shell variable.
	(--enable-lto): Turn on by default for all non-ELF platforms that
	have had LTO support added so far.  Set build_lto_plugin appropriately
	for both ELF and non-ELF.
	(configdirs): Add lto-plugin or not based on build_lto_plugin.
	* configure: Regenerate.

gcc/ChangeLog:

2010-10-07  Dave Korn  <dave.korn.cygwin@gmail.com>

	* config.host (host_lto_plugin_soname): New shell variable.
	* configure.ac (LTOPLUGINSONAME): Add an AC_DEFINE for the above.
	* config.in: Regenerate.
	* configure: Regenerate.
	* gcc.c (main): Use LTOPLUGINSONAME instead of hard-coding name of
	LTO plugin shared library.

lto-plugin/ChangeLog:

2010-10-07  Dave Korn  <dave.korn.cygwin@gmail.com>

	* configure.ac: Source config.gcc to determine lto_binary_reader.
	(LTO_FORMAT): New AC_SUBST variable inferred from lto_binary_reader.
	* Makefile.am (LTO_FORMAT): Import.
	(liblto_plugin_la_SOURCES): Add object format dependent module
	defined by LTO_FORMAT.
	(liblto_plugin_la_LIBADD): Allow for both PIC and non-PIC libiberty,
	and work around libtool warning.
	* configure: Regenerate.
	* Makefile.in: Likewise.
	* lto-plugin.c (struct sym_aux): Move to new lto-plugin.h.
	(struct sym_aux): Likewise.
	(struct plugin_symtab): Likewise.
	(struct plugin_file_info): Likewise.
	(LTO_SECTION_PREFIX): Likewise.
	(add_symbols):  Make non-static.
	(claimed_files): Likewise.
	(num_claimed_files): Likewise.
	(check): Likewise.
	(parse_table_entry): Likewise.
	(translate): Likewise.
	(resolve_conflicts): Likewise.
	(process_symtab): Move to new lto-plugin-elf.c object format dependent
	source file.
	(claim_file_handler): Likewise, and make non-static.
	(onload): Call new onload_format_checks function.
	* lto-plugin.h: New file.
	(LTO_SECTION_PREFIX): Move here.
	(struct sym_aux): Likewise.
	(struct plugin_symtab): Likewise.
	(struct plugin_file_info): Likewise.
	(claim_file_handler): Add new function prototype.
	(onload_format_checks): Likewise.
	(check): Declare extern.
	(translate): Likewise.
	(parse_table_entry): Likewise.
	(resolve_conflicts): Likewise.
	(add_symbols):  Likewise.
	(claimed_files): Likewise.
	(num_claimed_files): Likewise.
	* lto-plugin-elf.c (process_symtab): Move here.
	(claim_file_handler): Likewise, and make non-static.
	(onload_format_checks): New function factored out from onload.
	* lto-plugin-coff.c (claim_file_handler): New function stub.
	(onload_format_checks): Likewise.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@165133 138bc75d-0d04-0410-961f-82ee72b054a4

9 files changed, 391 insertions, 175 deletions

diff --git a/lto-plugin/ChangeLog b/lto-plugin/ChangeLog
index 6f6c4e8908c..9caad6aab54 100644
--- a/lto-plugin/ChangeLog
+++ b/lto-plugin/ChangeLog
@@ -1,3 +1,50 @@
+2010-10-07  Dave Korn  <dave.korn.cygwin@gmail.com>
+
+	* configure.ac: Source config.gcc to determine lto_binary_reader.
+	(LTO_FORMAT): New AC_SUBST variable inferred from lto_binary_reader.
+	* Makefile.am (LTO_FORMAT): Import.
+	(liblto_plugin_la_SOURCES): Add object format dependent module
+	defined by LTO_FORMAT.
+	(liblto_plugin_la_LIBADD): Allow for both PIC and non-PIC libiberty,
+	and work around libtool warning.
+	* configure: Regenerate.
+	* Makefile.in: Likewise.
+	* lto-plugin.c (struct sym_aux): Move to new lto-plugin.h.
+	(struct sym_aux): Likewise.
+	(struct plugin_symtab): Likewise.
+	(struct plugin_file_info): Likewise.
+	(LTO_SECTION_PREFIX): Likewise.
+	(add_symbols):  Make non-static.
+	(claimed_files): Likewise.
+	(num_claimed_files): Likewise.
+	(check): Likewise.
+	(parse_table_entry): Likewise.
+	(translate): Likewise.
+	(resolve_conflicts): Likewise.
+	(process_symtab): Move to new lto-plugin-elf.c object format dependent
+	source file.
+	(claim_file_handler): Likewise, and make non-static.
+	(onload): Call new onload_format_checks function.
+	* lto-plugin.h: New file.
+	(LTO_SECTION_PREFIX): Move here.
+	(struct sym_aux): Likewise.
+	(struct plugin_symtab): Likewise.
+	(struct plugin_file_info): Likewise.
+	(claim_file_handler): Add new function prototype.
+	(onload_format_checks): Likewise.
+	(check): Declare extern.
+	(translate): Likewise.
+	(parse_table_entry): Likewise.
+	(resolve_conflicts): Likewise.
+	(add_symbols):  Likewise.
+	(claimed_files): Likewise.
+	(num_claimed_files): Likewise.
+	* lto-plugin-elf.c (process_symtab): Move here.
+	(claim_file_handler): Likewise, and make non-static.
+	(onload_format_checks): New function factored out from onload.
+	* lto-plugin-coff.c (claim_file_handler): New function stub.
+	(onload_format_checks): Likewise.
+
 2010-08-05  Andi Kleen  <ak@linux.intel.com>
 
 	* lto-plugin.c: Include <hashtab.h>
diff --git a/lto-plugin/Makefile.am b/lto-plugin/Makefile.am
index da74e1c778c..52bf6719daa 100644
--- a/lto-plugin/Makefile.am
+++ b/lto-plugin/Makefile.am
@@ -11,13 +11,19 @@ libexecsubdir := $(libexecdir)/gcc/$(target_noncanonical)/$(gcc_version)
 LIBELFLIBS = @LIBELFLIBS@
 LIBELFINC = @LIBELFINC@
 
+# Which object format to parse.
+LTO_FORMAT = @LTO_FORMAT@
+
 AM_CPPFLAGS = -I$(top_srcdir)/../include $(LIBELFINC)
 AM_CFLAGS = -Wall -Werror
 
 libexecsub_LTLIBRARIES = liblto_plugin.la
 
-liblto_plugin_la_SOURCES = lto-plugin.c
-liblto_plugin_la_LIBADD = $(LIBELFLIBS) ../libiberty/pic/libiberty.a
+liblto_plugin_la_SOURCES = lto-plugin.c lto-plugin-$(LTO_FORMAT).c
+liblto_plugin_la_LIBADD = $(LIBELFLIBS) \
+	$(if $(wildcard ../libiberty/pic/libiberty.a),../libiberty/pic/libiberty.a,)
+liblto_plugin_la_LDFLAGS = -no-undefined -bindir $(libexecsubdir) \
+	$(if $(wildcard ../libiberty/pic/libiberty.a),,-Wc,../libiberty/libiberty.a)
 
 all: copy_lto_plugin
 
diff --git a/lto-plugin/Makefile.in b/lto-plugin/Makefile.in
index 2f58f9bbe36..c3f5260ed7d 100644
--- a/lto-plugin/Makefile.in
+++ b/lto-plugin/Makefile.in
@@ -79,10 +79,14 @@ am__base_list = \
 am__installdirs = "$(DESTDIR)$(libexecsubdir)"
 LTLIBRARIES = $(libexecsub_LTLIBRARIES)
 am__DEPENDENCIES_1 =
-liblto_plugin_la_DEPENDENCIES = $(am__DEPENDENCIES_1) \
-	../libiberty/pic/libiberty.a
-am_liblto_plugin_la_OBJECTS = lto-plugin.lo
+liblto_plugin_la_DEPENDENCIES = $(am__DEPENDENCIES_1) $(if $(wildcard \
+	../libiberty/pic/libiberty.a),../libiberty/pic/libiberty.a,)
+am_liblto_plugin_la_OBJECTS = lto-plugin.lo \
+	lto-plugin-$(LTO_FORMAT).lo
 liblto_plugin_la_OBJECTS = $(am_liblto_plugin_la_OBJECTS)
+liblto_plugin_la_LINK = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) \
+	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
+	$(liblto_plugin_la_LDFLAGS) $(LDFLAGS) -o $@
 DEFAULT_INCLUDES = -I.@am__isrc@
 depcomp =
 am__depfiles_maybe =
@@ -139,6 +143,9 @@ LIBTOOL = @LIBTOOL@
 LIPO = @LIPO@
 LN_S = @LN_S@
 LTLIBOBJS = @LTLIBOBJS@
+
+# Which object format to parse.
+LTO_FORMAT = @LTO_FORMAT@
 MAINT = @MAINT@
 MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
@@ -225,8 +232,13 @@ libexecsubdir := $(libexecdir)/gcc/$(target_noncanonical)/$(gcc_version)
 AM_CPPFLAGS = -I$(top_srcdir)/../include $(LIBELFINC)
 AM_CFLAGS = -Wall -Werror
 libexecsub_LTLIBRARIES = liblto_plugin.la
-liblto_plugin_la_SOURCES = lto-plugin.c
-liblto_plugin_la_LIBADD = $(LIBELFLIBS) ../libiberty/pic/libiberty.a
+liblto_plugin_la_SOURCES = lto-plugin.c lto-plugin-$(LTO_FORMAT).c
+liblto_plugin_la_LIBADD = $(LIBELFLIBS) \
+	$(if $(wildcard ../libiberty/pic/libiberty.a),../libiberty/pic/libiberty.a,)
+
+liblto_plugin_la_LDFLAGS = -no-undefined -bindir $(libexecsubdir) \
+	$(if $(wildcard ../libiberty/pic/libiberty.a),,-Wc,../libiberty/libiberty.a)
+
 all: all-am
 
 .SUFFIXES:
@@ -297,7 +309,7 @@ clean-libexecsubLTLIBRARIES:
 	  rm -f "$${dir}/so_locations"; \
 	done
 liblto_plugin.la: $(liblto_plugin_la_OBJECTS) $(liblto_plugin_la_DEPENDENCIES) 
-	$(LINK) -rpath $(libexecsubdir) $(liblto_plugin_la_OBJECTS) $(liblto_plugin_la_LIBADD) $(LIBS)
+	$(liblto_plugin_la_LINK) -rpath $(libexecsubdir) $(liblto_plugin_la_OBJECTS) $(liblto_plugin_la_LIBADD) $(LIBS)
 
 mostlyclean-compile:
 	-rm -f *.$(OBJEXT)
diff --git a/lto-plugin/configure b/lto-plugin/configure
index 234ff90a055..1e4041bc7e7 100755
--- a/lto-plugin/configure
+++ b/lto-plugin/configure
@@ -601,6 +601,7 @@ ac_subst_vars='am__EXEEXT_FALSE
 am__EXEEXT_TRUE
 LTLIBOBJS
 LIBOBJS
+LTO_FORMAT
 target_noncanonical
 CPP
 OTOOL64
@@ -10397,7 +10398,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 10400 "configure"
+#line 10401 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -10503,7 +10504,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 10506 "configure"
+#line 10507 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -10741,6 +10742,14 @@ CC="$lt_save_CC"
 
 
 
+. ${srcdir}/../gcc/config.gcc
+case ${lto_binary_reader} in
+  *coff*) LTO_FORMAT=coff ;;
+  *elf*)  LTO_FORMAT=elf ;;
+  *) as_fn_error "LTO plugin is not supported on this target." "$LINENO" 5 ;;
+esac
+
+
 ac_fn_c_find_uintX_t "$LINENO" "64" "ac_cv_c_uint64_t"
 case $ac_cv_c_uint64_t in #(
   no|yes) ;; #(
diff --git a/lto-plugin/configure.ac b/lto-plugin/configure.ac
index e89a982b971..c43b26434e8 100644
--- a/lto-plugin/configure.ac
+++ b/lto-plugin/configure.ac
@@ -9,6 +9,14 @@ AC_ARG_VAR(LIBELFLIBS,[How to link libelf])
 AC_ARG_VAR(LIBELFINC,[How to find libelf include files])
 AM_PROG_LIBTOOL
 AC_SUBST(target_noncanonical)
+. ${srcdir}/../gcc/config.gcc
+case ${lto_binary_reader} in
+  *coff*) LTO_FORMAT=coff ;;
+  *elf*)  LTO_FORMAT=elf ;;
+  *) AC_MSG_ERROR([LTO plugin is not supported on this target.]) ;;
+esac
+
+AC_SUBST(LTO_FORMAT)
 AC_TYPE_UINT64_T
 AC_CONFIG_FILES(Makefile)
 AC_OUTPUT
diff --git a/lto-plugin/lto-plugin-coff.c b/lto-plugin/lto-plugin-coff.c
new file mode 100644
index 00000000000..acaff5979f2
--- /dev/null
+++ b/lto-plugin/lto-plugin-coff.c
@@ -0,0 +1,38 @@
+/* LTO plugin for gold.
+   Copyright (C) 2010 Free Software Foundation, Inc.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+This program is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+/* Common definitions that the object format dependent code needs.  */
+#include "lto-plugin.h"
+
+/* Callback used by gold to check if the plugin will claim FILE. Writes
+   the result in CLAIMED. */
+
+enum ld_plugin_status
+claim_file_handler (const struct ld_plugin_input_file *file, int *claimed)
+{
+  /* To be implemented; for now, simply do nothing.  */
+  return LDPS_OK;
+}
+
+/* Method called first thing at onload time to perform sanity checks.  */
+
+enum ld_plugin_status
+onload_format_checks (struct ld_plugin_tv *tv)
+{
+  return LDPS_OK;
+}
+
diff --git a/lto-plugin/lto-plugin-elf.c b/lto-plugin/lto-plugin-elf.c
new file mode 100644
index 00000000000..afd79dac056
--- /dev/null
+++ b/lto-plugin/lto-plugin-elf.c
@@ -0,0 +1,157 @@
+/* LTO plugin for gold.
+   Copyright (C) 2009, 2010 Free Software Foundation, Inc.
+   Contributed by Rafael Avila de Espindola (espindola@google.com).
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+This program is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+#include <libiberty.h>
+#include <stdlib.h>
+#include <inttypes.h>
+
+/* The presence of gelf.h is checked by the toplevel configure script.  */
+#include <gelf.h>
+
+/* Common definitions that the object format dependent code needs.  */
+#include "lto-plugin.h"
+
+/* Process all lto symtabs of file ELF. */
+
+static int
+process_symtab (Elf *elf, struct plugin_symtab *out)
+{
+  int found = 0;
+  Elf_Scn *section = 0;
+  GElf_Ehdr header;
+  GElf_Ehdr *t = gelf_getehdr (elf, &header);
+  if (t == NULL)
+    return 0;
+  assert (t == &header);
+
+  while ((section = elf_nextscn(elf, section)) != 0)
+    {
+      GElf_Shdr shdr;
+      GElf_Shdr *tshdr = gelf_getshdr (section, &shdr);
+      Elf_Data *symtab;
+      const char *t;
+      assert (tshdr == &shdr);
+      t = elf_strptr (elf, header.e_shstrndx, shdr.sh_name);
+      assert (t != NULL);
+      if (strncmp (t, LTO_SECTION_PREFIX, strlen (LTO_SECTION_PREFIX)) == 0) 
+	{
+	  char *s = strrchr (t, '.');
+	  if (s)
+	      sscanf (s, ".%x", &out->id);
+	  symtab = elf_getdata (section, NULL);
+	  translate (symtab->d_buf, symtab->d_buf + symtab->d_size, out);
+	  found++;
+	}
+    }
+  return found;
+}
+
+/* Callback used by gold to check if the plugin will claim FILE. Writes
+   the result in CLAIMED. */
+
+enum ld_plugin_status
+claim_file_handler (const struct ld_plugin_input_file *file, int *claimed)
+{
+  enum ld_plugin_status status;
+  Elf *elf;
+  struct plugin_file_info lto_file;
+  int n;
+
+  memset (&lto_file, 0, sizeof (struct plugin_file_info));
+
+  if (file->offset != 0)
+    {
+      char *objname;
+      Elf *archive;
+      off_t offset;
+      /* We pass the offset of the actual file, not the archive header. */
+      int t = asprintf (&objname, "%s@0x%" PRIx64, file->name,
+                        (int64_t) file->offset);
+      check (t >= 0, LDPL_FATAL, "asprintf failed");
+      lto_file.name = objname;
+
+      archive = elf_begin (file->fd, ELF_C_READ, NULL);
+      check (elf_kind (archive) == ELF_K_AR, LDPL_FATAL,
+             "Not an archive and offset not 0");
+
+      /* elf_rand expects the offset to point to the ar header, not the
+         object itself. Subtract the size of the ar header (60 bytes).
+         We don't uses sizeof (struct ar_hd) to avoid including ar.h */
+
+      offset = file->offset - 60;
+      check (offset == elf_rand (archive, offset), LDPL_FATAL,
+             "could not seek in archive");
+      elf = elf_begin (file->fd, ELF_C_READ, archive);
+      check (elf != NULL, LDPL_FATAL, "could not find archive member");
+      elf_end (archive);
+    }
+  else
+    {
+      lto_file.name = xstrdup (file->name);
+      elf = elf_begin (file->fd, ELF_C_READ, NULL);
+    }
+  lto_file.handle = file->handle;
+
+  *claimed = 0;
+
+  if (!elf)
+    goto err;
+
+  n = process_symtab (elf, &lto_file.symtab);
+  if (n == 0)
+    goto err;
+
+  if (n > 1)
+    resolve_conflicts (&lto_file.symtab, &lto_file.conflicts);
+
+  status = add_symbols (file->handle, lto_file.symtab.nsyms,
+			lto_file.symtab.syms);
+  check (status == LDPS_OK, LDPL_FATAL, "could not add symbols");
+
+  *claimed = 1;
+  num_claimed_files++;
+  claimed_files =
+    xrealloc (claimed_files,
+	      num_claimed_files * sizeof (struct plugin_file_info));
+  claimed_files[num_claimed_files - 1] = lto_file;
+
+  goto cleanup;
+
+ err:
+  free (lto_file.name);
+
+ cleanup:
+  if (elf)
+    elf_end (elf);
+
+  return LDPS_OK;
+}
+
+/* Method called first thing at onload time to perform sanity checks.  */
+
+enum ld_plugin_status
+onload_format_checks (struct ld_plugin_tv *tv)
+{
+  unsigned version = elf_version (EV_CURRENT);
+  check (version != EV_NONE, LDPL_FATAL, "invalid ELF version");
+  return LDPS_OK;
+}
+
diff --git a/lto-plugin/lto-plugin.c b/lto-plugin/lto-plugin.c
index dc51b48bc5a..7e8443d021e 100644
--- a/lto-plugin/lto-plugin.c
+++ b/lto-plugin/lto-plugin.c
@@ -1,5 +1,5 @@
-/* LTO plugin for gold.
-   Copyright (C) 2009 Free Software Foundation, Inc.
+/* LTO plugin for gold and/or GNU ld.
+   Copyright (C) 2009, 2010 Free Software Foundation, Inc.
    Contributed by Rafael Avila de Espindola (espindola@google.com).
 
 This program is free software; you can redistribute it and/or modify
@@ -45,46 +45,13 @@ along with this program; see the file COPYING3.  If not see
 #include <stdbool.h>
 #include <libiberty.h>
 #include <hashtab.h>
-
-/* The presence of gelf.h is checked by the toplevel configure script.  */
-#include <gelf.h>
-
-#include "plugin-api.h"
 #include "../gcc/lto/common.h"
 
-/* The part of the symbol table the plugin has to keep track of. Note that we
-   must keep SYMS until all_symbols_read is called to give the linker time to
-   copy the symbol information. */
-
-struct sym_aux
-{
-  uint32_t slot;
-  unsigned id;
-  unsigned next_conflict;
-};
-
-struct plugin_symtab
-{
-  int nsyms;
-  struct sym_aux *aux;
-  struct ld_plugin_symbol *syms;
-  unsigned id;
-};
-
-/* All that we have to remember about a file. */
-
-struct plugin_file_info
-{
-  char *name;
-  void *handle;
-  struct plugin_symtab symtab;
-  struct plugin_symtab conflicts;
-};
-
+/* Common definitions for/from the object format dependent code.  */
+#include "lto-plugin.h"
 
 static char *arguments_file_name;
 static ld_plugin_register_claim_file register_claim_file;
-static ld_plugin_add_symbols add_symbols;
 static ld_plugin_register_all_symbols_read register_all_symbols_read;
 static ld_plugin_get_symbols get_symbols;
 static ld_plugin_register_cleanup register_cleanup;
@@ -92,8 +59,12 @@ static ld_plugin_add_input_file add_input_file;
 static ld_plugin_add_input_library add_input_library;
 static ld_plugin_message message;
 
-static struct plugin_file_info *claimed_files = NULL;
-static unsigned int num_claimed_files = 0;
+/* These are not static because the object format dependent
+   claim_file hooks in lto-plugin-{coff,elf}.c need them.  */
+ld_plugin_add_symbols add_symbols;
+
+struct plugin_file_info *claimed_files = NULL;
+unsigned int num_claimed_files = 0;
 
 static char **output_files = NULL;
 static unsigned int num_output_files = 0;
@@ -108,7 +79,7 @@ static bool debug;
 static bool nop;
 static char *resolution_file = NULL;
 
-static void
+void
 check (bool gate, enum ld_plugin_level level, const char *text)
 {
   if (gate)
@@ -129,7 +100,7 @@ check (bool gate, enum ld_plugin_level level, const char *text)
    by P and the result is written in ENTRY. The slot number is stored in SLOT.
    Returns the address of the next entry. */
 
-static char *
+char *
 parse_table_entry (char *p, struct ld_plugin_symbol *entry, 
 		   struct sym_aux *aux)
 {
@@ -191,16 +162,13 @@ parse_table_entry (char *p, struct ld_plugin_symbol *entry,
   return p;
 }
 
-#define LTO_SECTION_PREFIX ".gnu.lto_.symtab"
-
-/* Translate the IL symbol table SYMTAB. Append the slots and symbols to OUT. */
+/* Translate the IL symbol table located between DATA and END. Append the
+   slots and symbols to OUT. */
 
-static void
-translate (Elf_Data *symtab, struct plugin_symtab *out)
+void
+translate (char *data, char *end, struct plugin_symtab *out)
 {
   struct sym_aux *aux;
-  char *data = symtab->d_buf;
-  char *end = data + symtab->d_size;
   struct ld_plugin_symbol *syms = NULL;
   int n, len;
 
@@ -224,39 +192,6 @@ translate (Elf_Data *symtab, struct plugin_symtab *out)
   out->aux = aux;
 }
 
-/* Process all lto symtabs of file ELF. */
-
-static int
-process_symtab (Elf *elf, struct plugin_symtab *out)
-{
-  int found = 0;
-  Elf_Scn *section = 0;
-  GElf_Ehdr header;
-  GElf_Ehdr *t = gelf_getehdr (elf, &header);
-  if (t == NULL)
-    return 0;
-  assert (t == &header);
-
-  while ((section = elf_nextscn(elf, section)) != 0)
-    {
-      GElf_Shdr shdr;
-      GElf_Shdr *tshdr = gelf_getshdr (section, &shdr);
-      const char *t;
-      assert (tshdr == &shdr);
-      t = elf_strptr (elf, header.e_shstrndx, shdr.sh_name);
-      assert (t != NULL);
-      if (strncmp (t, LTO_SECTION_PREFIX, strlen (LTO_SECTION_PREFIX)) == 0) 
-	{
-	  char *s = strrchr (t, '.');
-	  if (s)
-	      sscanf (s, ".%x", &out->id);
-	  translate (elf_getdata (section, NULL), out);
-	  found++;
-	}
-    }
-  return found;
-}
-
 /* Free all memory that is no longer needed after writing the symbol
    resolution. */
 
@@ -686,7 +621,7 @@ static int symbol_strength (struct ld_plugin_symbol *s)
    
    XXX how to handle common? */
 
-static void
+void
 resolve_conflicts (struct plugin_symtab *t, struct plugin_symtab *conflicts)
 {
   htab_t symtab = htab_create (t->nsyms, hash_sym, eq_sym, NULL);
@@ -754,87 +689,6 @@ resolve_conflicts (struct plugin_symtab *t, struct plugin_symtab *conflicts)
   htab_delete (symtab);
 }
 
-/* Callback used by gold to check if the plugin will claim FILE. Writes
-   the result in CLAIMED. */
-
-static enum ld_plugin_status
-claim_file_handler (const struct ld_plugin_input_file *file, int *claimed)
-{
-  enum ld_plugin_status status;
-  Elf *elf;
-  struct plugin_file_info lto_file;
-  int n;
-
-  memset (&lto_file, 0, sizeof (struct plugin_file_info));
-
-  if (file->offset != 0)
-    {
-      char *objname;
-      Elf *archive;
-      off_t offset;
-      /* We pass the offset of the actual file, not the archive header. */
-      int t = asprintf (&objname, "%s@0x%" PRIx64, file->name,
-                        (int64_t) file->offset);
-      check (t >= 0, LDPL_FATAL, "asprintf failed");
-      lto_file.name = objname;
-
-      archive = elf_begin (file->fd, ELF_C_READ, NULL);
-      check (elf_kind (archive) == ELF_K_AR, LDPL_FATAL,
-             "Not an archive and offset not 0");
-
-      /* elf_rand expects the offset to point to the ar header, not the
-         object itself. Subtract the size of the ar header (60 bytes).
-         We don't uses sizeof (struct ar_hd) to avoid including ar.h */
-
-      offset = file->offset - 60;
-      check (offset == elf_rand (archive, offset), LDPL_FATAL,
-             "could not seek in archive");
-      elf = elf_begin (file->fd, ELF_C_READ, archive);
-      check (elf != NULL, LDPL_FATAL, "could not find archive member");
-      elf_end (archive);
-    }
-  else
-    {
-      lto_file.name = xstrdup (file->name);
-      elf = elf_begin (file->fd, ELF_C_READ, NULL);
-    }
-  lto_file.handle = file->handle;
-
-  *claimed = 0;
-
-  if (!elf)
-    goto err;
-
-  n = process_symtab (elf, &lto_file.symtab);
-  if (n == 0)
-    goto err;
-
-  if (n > 1)
-    resolve_conflicts (&lto_file.symtab, &lto_file.conflicts);
-
-  status = add_symbols (file->handle, lto_file.symtab.nsyms,
-			lto_file.symtab.syms);
-  check (status == LDPS_OK, LDPL_FATAL, "could not add symbols");
-
-  *claimed = 1;
-  num_claimed_files++;
-  claimed_files =
-    xrealloc (claimed_files,
-	      num_claimed_files * sizeof (struct plugin_file_info));
-  claimed_files[num_claimed_files - 1] = lto_file;
-
-  goto cleanup;
-
- err:
-  free (lto_file.name);
-
- cleanup:
-  if (elf)
-    elf_end (elf);
-
-  return LDPS_OK;
-}
-
 /* Parse the plugin options. */
 
 static void
@@ -873,8 +727,9 @@ onload (struct ld_plugin_tv *tv)
   struct ld_plugin_tv *p;
   enum ld_plugin_status status;
 
-  unsigned version = elf_version (EV_CURRENT);
-  check (version != EV_NONE, LDPL_FATAL, "invalid ELF version");
+  status = onload_format_checks (tv);
+  if (status != LDPS_OK)
+    return status;
 
   p = tv;
   while (p->tv_tag)
diff --git a/lto-plugin/lto-plugin.h b/lto-plugin/lto-plugin.h
new file mode 100644
index 00000000000..09eb85003a7
--- /dev/null
+++ b/lto-plugin/lto-plugin.h
@@ -0,0 +1,84 @@
+/* Common declarations for LTO plugin for gold and/or GNU ld.
+   Copyright (C) 2009, 2010 Free Software Foundation, Inc.
+   Contributed by Rafael Avila de Espindola (espindola@google.com).
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+This program is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include <stdbool.h>
+#include "plugin-api.h"
+
+/* LTO magic section name.  */
+
+#define LTO_SECTION_PREFIX ".gnu.lto_.symtab"
+
+/* The part of the symbol table the plugin has to keep track of. Note that we
+   must keep SYMS until all_symbols_read is called to give the linker time to
+   copy the symbol information. */
+
+struct sym_aux
+{
+  uint32_t slot;
+  unsigned id;
+  unsigned next_conflict;
+};
+
+struct plugin_symtab
+{
+  int nsyms;
+  struct sym_aux *aux;
+  struct ld_plugin_symbol *syms;
+  unsigned id;
+};
+
+/* All that we have to remember about a file. */
+
+struct plugin_file_info
+{
+  char *name;
+  void *handle;
+  struct plugin_symtab symtab;
+  struct plugin_symtab conflicts;
+};
+
+/* These are the methods supplied by one of the object format
+   dependent files lto-plugin-elf.c or lto-plugin-coff.c  */
+
+extern enum ld_plugin_status claim_file_handler 
+		(const struct ld_plugin_input_file *file, int *claimed);
+
+extern enum ld_plugin_status onload_format_checks (struct ld_plugin_tv *tv);
+
+/* These methods are made available to the object format
+   dependent files.  */
+
+extern void check (bool gate, enum ld_plugin_level level, const char *text);
+
+extern void translate (char *data, char *end, struct plugin_symtab *out);
+
+extern char *parse_table_entry (char *p, struct ld_plugin_symbol *entry,
+			struct sym_aux *aux);
+
+extern void resolve_conflicts (struct plugin_symtab *t,
+			struct plugin_symtab *conflicts);
+
+/* And this callback function is exposed.  */
+
+extern ld_plugin_add_symbols add_symbols;
+
+/* Along with these two variables.  */
+
+extern struct plugin_file_info *claimed_files;
+extern unsigned int num_claimed_files;
+