* layout.cc: Include "object.h".

(ctors_sections_in_init_array): New static variable. (Layout::is_ctors_in_init_array): New function. (Layout::layout): Add entry to ctors_sections_in_init_array if appropriate. * layout.h (class Layout): Declare is_ctors_in_init_array. * reloc.cc (Sized_relobj_file::do_relocate): Call reverse_words if is_ctors_reverse_view is set. (Sized_relobj_file::write_sections): Add layout parameter. Change all callers. Set is_ctors_reverse_view field of View_size. (Sized_relobj_file::reverse_words): New function. * object.h (Sized_relobj_file::View_size): Add is_ctors_reverse_view field. (class Sized_relobj_file): Update declarations. * testsuite/initpri3.c: New test. * testsuite/Makefile.am: (check_PROGRAMS): Add initpri3a and initpri3b. (initpri3a_SOURCES, initpri3a_DEPENDENCIES): New variables. (initpri3a_LDFLAGS, initpri3a_LDADD): New variables. (initpri3b_SOURCES, initpri3b_DEPENDENCIES): New variables. (initpri3b_LDFLAGS, initpri3b_LDADD): New variables. * testsuite/Makefile.in: Rebuild.
2011-06-25 00:40:57 +00:00 · 2011-06-25 00:40:57 +00:00 · 487b39dfdd
commit 487b39dfdd
parent 79763091fb
8 changed files with 253 additions and 16 deletions
--- a/gold/ChangeLog
+++ b/gold/ChangeLog
@ -1,3 +1,28 @@
+2011-06-24  Ian Lance Taylor  <iant@google.com>
+
+	* layout.cc: Include "object.h".
+	(ctors_sections_in_init_array): New static variable.
+	(Layout::is_ctors_in_init_array): New function.
+	(Layout::layout): Add entry to ctors_sections_in_init_array if
+	appropriate.
+	* layout.h (class Layout): Declare is_ctors_in_init_array.
+	* reloc.cc (Sized_relobj_file::do_relocate): Call reverse_words if
+	is_ctors_reverse_view is set.
+	(Sized_relobj_file::write_sections): Add layout parameter.  Change
+	all callers.  Set is_ctors_reverse_view field of View_size.
+	(Sized_relobj_file::reverse_words): New function.
+	* object.h (Sized_relobj_file::View_size): Add
+	is_ctors_reverse_view field.
+	(class Sized_relobj_file): Update declarations.
+	* testsuite/initpri3.c: New test.
+	* testsuite/Makefile.am: (check_PROGRAMS): Add initpri3a and
+	initpri3b.
+	(initpri3a_SOURCES, initpri3a_DEPENDENCIES): New variables.
+	(initpri3a_LDFLAGS, initpri3a_LDADD): New variables.
+	(initpri3b_SOURCES, initpri3b_DEPENDENCIES): New variables.
+	(initpri3b_LDFLAGS, initpri3b_LDADD): New variables.
+	* testsuite/Makefile.in: Rebuild.
+
 2011-06-24  Cary Coutant  <ccoutant@google.com>

 	* testsuite/Makefile.am: Add in-tree assembler to gcctestdir.
--- a/gold/layout.cc
+++ b/gold/layout.cc
@ -46,6 +46,7 @@
 #include "ehframe.h"
 #include "compressed_output.h"
 #include "reduced_debug_output.h"
+#include "object.h"
 #include "reloc.h"
 #include "descriptors.h"
 #include "plugin.h"
@ -617,6 +618,30 @@ Layout::find_output_segment(elfcpp::PT type, elfcpp::Elf_Word set,
  return NULL;
 }

+// When we put a .ctors or .dtors section with more than one word into
+// a .init_array or .fini_array section, we need to reverse the words
+// in the .ctors/.dtors section.  This is because .init_array executes
+// constructors front to back, where .ctors executes them back to
+// front, and vice-versa for .fini_array/.dtors.  Although we do want
+// to remap .ctors/.dtors into .init_array/.fini_array because it can
+// be more efficient, we don't want to change the order in which
+// constructors/destructors are run.  This set just keeps track of
+// these sections which need to be reversed.  It is only changed by
+// Layout::layout.  It should be a private member of Layout, but that
+// would require layout.h to #include object.h to get the definition
+// of Section_id.
+static Unordered_set<Section_id, Section_id_hash> ctors_sections_in_init_array;
+
+// Return whether OBJECT/SHNDX is a .ctors/.dtors section mapped to a
+// .init_array/.fini_array section.
+
+bool
+Layout::is_ctors_in_init_array(Relobj* relobj, unsigned int shndx) const
+{
+  return (ctors_sections_in_init_array.find(Section_id(relobj, shndx))
+	  != ctors_sections_in_init_array.end());
+}
+
 // Return the output section to use for section NAME with type TYPE
 // and section flags FLAGS.  NAME must be canonicalized in the string
 // pool, and NAME_KEY is the key.  ORDER is where this should appear
@ -922,11 +947,11 @@ Layout::layout(Sized_relobj_file<size, big_endian>* object, unsigned int shndx,
    }

  // By default the GNU linker sorts input sections whose names match
-  // .ctor.*, .dtor.*, .init_array.*, or .fini_array.*.  The sections
-  // are sorted by name.  This is used to implement constructor
-  // priority ordering.  We are compatible.  When we put .ctor
-  // sections in .init_array and .dtor sections in .fini_array, we
-  // must also sort plain .ctor and .dtor sections.
+  // .ctors.*, .dtors.*, .init_array.*, or .fini_array.*.  The
+  // sections are sorted by name.  This is used to implement
+  // constructor priority ordering.  We are compatible.  When we put
+  // .ctor sections in .init_array and .dtor sections in .fini_array,
+  // we must also sort plain .ctor and .dtor sections.
  if (!this->script_options_->saw_sections_clause()
      && !parameters->options().relocatable()
      && (is_prefix_of(".ctors.", name)
@ -938,6 +963,22 @@ Layout::layout(Sized_relobj_file<size, big_endian>* object, unsigned int shndx,
 		  || strcmp(name, ".dtors") == 0))))
    os->set_must_sort_attached_input_sections();

+  // If this is a .ctors or .ctors.* section being mapped to a
+  // .init_array section, or a .dtors or .dtors.* section being mapped
+  // to a .fini_array section, we will need to reverse the words if
+  // there is more than one.  Record this section for later.  See
+  // ctors_sections_in_init_array above.
+  if (!this->script_options_->saw_sections_clause()
+      && !parameters->options().relocatable()
+      && shdr.get_sh_size() > size / 8
+      && (((strcmp(name, ".ctors") == 0
+	    || is_prefix_of(".ctors.", name))
+	   && strcmp(os->name(), ".init_array") == 0)
+	  || ((strcmp(name, ".dtors") == 0
+	       || is_prefix_of(".dtors.", name))
+	      && strcmp(os->name(), ".fini_array") == 0)))
+    ctors_sections_in_init_array.insert(Section_id(object, shndx));
+
  // FIXME: Handle SHF_LINK_ORDER somewhere.

  elfcpp::Elf_Xword orig_flags = os->flags();
--- a/gold/layout.h
+++ b/gold/layout.h
@ -651,6 +651,12 @@ class Layout
  static bool
  match_file_name(const Relobj* relobj, const char* file_name);

+  // Return whether section SHNDX in RELOBJ is a .ctors/.dtors section
+  // with more than one word being mapped to a .init_array/.fini_array
+  // section.
+  bool
+  is_ctors_in_init_array(Relobj* relobj, unsigned int shndx) const;
+
  // Check if a comdat group or .gnu.linkonce section with the given
  // NAME is selected for the link.  If there is already a section,
  // *KEPT_SECTION is set to point to the signature and the function
--- a/gold/object.h
+++ b/gold/object.h
@ -2220,6 +2220,7 @@ class Sized_relobj_file : public Sized_relobj<size, big_endian>
    section_size_type view_size;
    bool is_input_output_view;
    bool is_postprocessing_view;
+    bool is_ctors_reverse_view;
  };

  typedef std::vector<View_size> Views;
@ -2311,7 +2312,8 @@ class Sized_relobj_file : public Sized_relobj<size, big_endian>
  // Write section data to the output file.  Record the views and
  // sizes in VIEWS for use when relocating.
  void
-  write_sections(const unsigned char* pshdrs, Output_file*, Views*);
+  write_sections(const Layout*, const unsigned char* pshdrs, Output_file*,
+		 Views*);

  // Relocate the sections in the output file.
  void
@ -2320,6 +2322,11 @@ class Sized_relobj_file : public Sized_relobj<size, big_endian>
 		    Views* pviews)
  { this->do_relocate_sections(symtab, layout, pshdrs, of, pviews); }

+  // Reverse the words in a section.  Used for .ctors sections mapped
+  // to .init_array sections.
+  void
+  reverse_words(unsigned char*, section_size_type);
+
  // Scan the input relocations for --emit-relocs.
  void
  emit_relocs_scan(Symbol_table*, Layout*, const unsigned char* plocal_syms,
--- a/gold/reloc.cc
+++ b/gold/reloc.cc
@ -659,7 +659,7 @@ Sized_relobj_file<size, big_endian>::do_relocate(const Symbol_table* symtab,
  // section data to the output file.  The second one applies
  // relocations.

-  this->write_sections(pshdrs, of, &views);
+  this->write_sections(layout, pshdrs, of, &views);

  // To speed up relocations, we set up hash tables for fast lookup of
  // input offsets to output addresses.
@ -678,6 +678,8 @@ Sized_relobj_file<size, big_endian>::do_relocate(const Symbol_table* symtab,
    {
      if (views[i].view != NULL)
 	{
+	  if (views[i].is_ctors_reverse_view)
+	    this->reverse_words(views[i].view, views[i].view_size);
 	  if (!views[i].is_postprocessing_view)
 	    {
 	      if (views[i].is_input_output_view)
@ -712,7 +714,8 @@ struct Read_multiple_compare

 template<int size, bool big_endian>
 void
-Sized_relobj_file<size, big_endian>::write_sections(const unsigned char* pshdrs,
+Sized_relobj_file<size, big_endian>::write_sections(const Layout* layout,
+						    const unsigned char* pshdrs,
 						    Output_file* of,
 						    Views* pviews)
 {
@ -761,6 +764,7 @@ Sized_relobj_file<size, big_endian>::write_sections(const unsigned char* pshdrs,
 	  pvs->address = posd->address();
 	  pvs->is_input_output_view = false;
 	  pvs->is_postprocessing_view = false;
+	  pvs->is_ctors_reverse_view = false;

 	  continue;
 	}
@ -875,6 +879,12 @@ Sized_relobj_file<size, big_endian>::write_sections(const unsigned char* pshdrs,
      pvs->view_size = view_size;
      pvs->is_input_output_view = output_offset == invalid_address;
      pvs->is_postprocessing_view = os->requires_postprocessing();
+      pvs->is_ctors_reverse_view =
+	(!parameters->options().relocatable()
+	 && view_size > size / 8
+	 && (strcmp(os->name(), ".init_array") == 0
+	     || strcmp(os->name(), ".fini_array") == 0)
+	 && layout->is_ctors_in_init_array(this, i));
    }

  // Actually read the data.
@ -1483,6 +1493,26 @@ Sized_relobj_file<size, big_endian>::find_functions(
    }
 }

+// Reverse the words in a section.  Used for .ctors sections mapped to
+// .init_array sections.  See ctors_sections_in_init_array in
+// layout.cc.
+
+template<int size, bool big_endian>
+void
+Sized_relobj_file<size, big_endian>::reverse_words(unsigned char* view,
+						   section_size_type view_size)
+{
+  typedef typename elfcpp::Swap<size, big_endian>::Valtype Valtype;
+  Valtype* vview = reinterpret_cast<Valtype*>(view);
+  section_size_type vview_size = view_size / (size / 8);
+  for (section_size_type i = 0; i < vview_size / 2; ++i)
+    {
+      Valtype tmp = vview[i];
+      vview[i] = vview[vview_size - 1 - i];
+      vview[vview_size - 1 - i] = tmp;
+    }
+}
+
 // Class Merged_symbol_value.

 template<int size>
--- a/gold/testsuite/Makefile.am
+++ b/gold/testsuite/Makefile.am
@ -846,6 +846,18 @@ initpri2_DEPENDENCIES = gcctestdir/ld
 initpri2_LDFLAGS = -Bgcctestdir/
 initpri2_LDADD =

+check_PROGRAMS += initpri3a
+initpri3a_SOURCES = initpri3.c
+initpri3a_DEPENDENCIES = gcctestdir/ld
+initpri3a_LDFLAGS = -Bgcctestdir/
+initpri3a_LDADD =
+
+check_PROGRAMS += initpri3b
+initpri3b_SOURCES = initpri3.c
+initpri3b_DEPENDENCIES = gcctestdir/ld
+initpri3b_LDFLAGS = -Bgcctestdir/ -Wl,--no-ctors-in-init-array
+initpri3b_LDADD =
+
 # Test --detect-odr-violations
 check_SCRIPTS += debug_msg.sh

--- a/gold/testsuite/Makefile.in
+++ b/gold/testsuite/Makefile.in
@ -181,7 +181,8 @@ check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
 # Test -o when emitting to a special file (such as something in /dev).
@GCC_TRUE@@NATIVE_LINKER_TRUE@am__append_16 = many_sections_test \
@GCC_TRUE@@NATIVE_LINKER_TRUE@	many_sections_r_test initpri1 \
-@GCC_TRUE@@NATIVE_LINKER_TRUE@	initpri2 flagstest_o_specialfile
+@GCC_TRUE@@NATIVE_LINKER_TRUE@	initpri2 initpri3a initpri3b \
+@GCC_TRUE@@NATIVE_LINKER_TRUE@	flagstest_o_specialfile
@GCC_FALSE@many_sections_test_DEPENDENCIES =
@NATIVE_LINKER_FALSE@many_sections_test_DEPENDENCIES =
@GCC_TRUE@@NATIVE_LINKER_TRUE@am__append_17 = many_sections_define.h \
@ -193,6 +194,10 @@ check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
@NATIVE_LINKER_FALSE@initpri1_DEPENDENCIES =
@GCC_FALSE@initpri2_DEPENDENCIES =
@NATIVE_LINKER_FALSE@initpri2_DEPENDENCIES =
+@GCC_FALSE@initpri3a_DEPENDENCIES =
+@NATIVE_LINKER_FALSE@initpri3a_DEPENDENCIES =
+@GCC_FALSE@initpri3b_DEPENDENCIES =
+@NATIVE_LINKER_FALSE@initpri3b_DEPENDENCIES =

 # Check that --detect-odr-violations works with compressed debug sections.
@GCC_TRUE@@HAVE_ZLIB_TRUE@@NATIVE_LINKER_TRUE@am__append_19 = debug_msg_cdebug.err
@ -618,6 +623,8 @@ libgoldtest_a_OBJECTS = $(am_libgoldtest_a_OBJECTS)
@GCC_TRUE@@NATIVE_LINKER_TRUE@	many_sections_r_test$(EXEEXT) \
@GCC_TRUE@@NATIVE_LINKER_TRUE@	initpri1$(EXEEXT) \
@GCC_TRUE@@NATIVE_LINKER_TRUE@	initpri2$(EXEEXT) \
+@GCC_TRUE@@NATIVE_LINKER_TRUE@	initpri3a$(EXEEXT) \
+@GCC_TRUE@@NATIVE_LINKER_TRUE@	initpri3b$(EXEEXT) \
@GCC_TRUE@@NATIVE_LINKER_TRUE@	flagstest_o_specialfile$(EXEEXT)
@GCC_TRUE@@HAVE_ZLIB_TRUE@@NATIVE_LINKER_TRUE@am__EXEEXT_13 = flagstest_compress_debug_sections$(EXEEXT) \
@GCC_TRUE@@HAVE_ZLIB_TRUE@@NATIVE_LINKER_TRUE@	flagstest_o_specialfile_and_compress_debug_sections$(EXEEXT)
@ -1058,6 +1065,16 @@ initpri1_LINK = $(CCLD) $(AM_CFLAGS) $(CFLAGS) $(initpri1_LDFLAGS) \
 initpri2_OBJECTS = $(am_initpri2_OBJECTS)
 initpri2_LINK = $(CCLD) $(AM_CFLAGS) $(CFLAGS) $(initpri2_LDFLAGS) \
 	$(LDFLAGS) -o $@
+@GCC_TRUE@@NATIVE_LINKER_TRUE@am_initpri3a_OBJECTS =  \
+@GCC_TRUE@@NATIVE_LINKER_TRUE@	initpri3.$(OBJEXT)
+initpri3a_OBJECTS = $(am_initpri3a_OBJECTS)
+initpri3a_LINK = $(CCLD) $(AM_CFLAGS) $(CFLAGS) $(initpri3a_LDFLAGS) \
+	$(LDFLAGS) -o $@
+@GCC_TRUE@@NATIVE_LINKER_TRUE@am_initpri3b_OBJECTS =  \
+@GCC_TRUE@@NATIVE_LINKER_TRUE@	initpri3.$(OBJEXT)
+initpri3b_OBJECTS = $(am_initpri3b_OBJECTS)
+initpri3b_LINK = $(CCLD) $(AM_CFLAGS) $(CFLAGS) $(initpri3b_LDFLAGS) \
+	$(LDFLAGS) -o $@
@GCC_TRUE@@NATIVE_LINKER_TRUE@am_justsyms_OBJECTS =  \
@GCC_TRUE@@NATIVE_LINKER_TRUE@	justsyms_1.$(OBJEXT)
 justsyms_OBJECTS = $(am_justsyms_OBJECTS)
@ -1535,13 +1552,13 @@ SOURCES = $(libgoldtest_a_SOURCES) basic_pic_test.c basic_pie_test.c \
 	$(ifuncmain7static_SOURCES) incremental_common_test_1.c \
 	incremental_copy_test.c incremental_test_2.c \
 	incremental_test_3.c incremental_test_4.c $(initpri1_SOURCES) \
-	$(initpri2_SOURCES) $(justsyms_SOURCES) $(large_SOURCES) \
-	local_labels_test.c many_sections_r_test.c \
-	$(many_sections_test_SOURCES) $(object_unittest_SOURCES) \
-	permission_test.c plugin_test_1.c plugin_test_2.c \
-	plugin_test_3.c plugin_test_4.c plugin_test_5.c \
-	plugin_test_6.c plugin_test_7.c plugin_test_8.c \
-	$(protected_1_SOURCES) $(protected_2_SOURCES) \
+	$(initpri2_SOURCES) $(initpri3a_SOURCES) $(initpri3b_SOURCES) \
+	$(justsyms_SOURCES) $(large_SOURCES) local_labels_test.c \
+	many_sections_r_test.c $(many_sections_test_SOURCES) \
+	$(object_unittest_SOURCES) permission_test.c plugin_test_1.c \
+	plugin_test_2.c plugin_test_3.c plugin_test_4.c \
+	plugin_test_5.c plugin_test_6.c plugin_test_7.c \
+	plugin_test_8.c $(protected_1_SOURCES) $(protected_2_SOURCES) \
 	$(relro_script_test_SOURCES) $(relro_strip_test_SOURCES) \
 	$(relro_test_SOURCES) $(script_test_1_SOURCES) \
 	$(script_test_2_SOURCES) script_test_3.c \
@ -2111,6 +2128,14 @@ LDADD = libgoldtest.a ../libgold.a ../../libiberty/libiberty.a $(LIBINTL) \
@GCC_TRUE@@NATIVE_LINKER_TRUE@initpri2_DEPENDENCIES = gcctestdir/ld
@GCC_TRUE@@NATIVE_LINKER_TRUE@initpri2_LDFLAGS = -Bgcctestdir/
@GCC_TRUE@@NATIVE_LINKER_TRUE@initpri2_LDADD = 
+@GCC_TRUE@@NATIVE_LINKER_TRUE@initpri3a_SOURCES = initpri3.c
+@GCC_TRUE@@NATIVE_LINKER_TRUE@initpri3a_DEPENDENCIES = gcctestdir/ld
+@GCC_TRUE@@NATIVE_LINKER_TRUE@initpri3a_LDFLAGS = -Bgcctestdir/
+@GCC_TRUE@@NATIVE_LINKER_TRUE@initpri3a_LDADD = 
+@GCC_TRUE@@NATIVE_LINKER_TRUE@initpri3b_SOURCES = initpri3.c
+@GCC_TRUE@@NATIVE_LINKER_TRUE@initpri3b_DEPENDENCIES = gcctestdir/ld
+@GCC_TRUE@@NATIVE_LINKER_TRUE@initpri3b_LDFLAGS = -Bgcctestdir/ -Wl,--no-ctors-in-init-array
+@GCC_TRUE@@NATIVE_LINKER_TRUE@initpri3b_LDADD = 
@GCC_TRUE@@NATIVE_LINKER_TRUE@ver_test_SOURCES = ver_test_main.cc
@GCC_TRUE@@NATIVE_LINKER_TRUE@ver_test_DEPENDENCIES = gcctestdir/ld ver_test_1.so ver_test_2.so ver_test_4.so
@GCC_TRUE@@NATIVE_LINKER_TRUE@ver_test_LDFLAGS = -Bgcctestdir/ -Wl,-R,.
@ -2663,6 +2688,12 @@ initpri1$(EXEEXT): $(initpri1_OBJECTS) $(initpri1_DEPENDENCIES)
 initpri2$(EXEEXT): $(initpri2_OBJECTS) $(initpri2_DEPENDENCIES) 
 	@rm -f initpri2$(EXEEXT)
 	$(initpri2_LINK) $(initpri2_OBJECTS) $(initpri2_LDADD) $(LIBS)
+initpri3a$(EXEEXT): $(initpri3a_OBJECTS) $(initpri3a_DEPENDENCIES) 
+	@rm -f initpri3a$(EXEEXT)
+	$(initpri3a_LINK) $(initpri3a_OBJECTS) $(initpri3a_LDADD) $(LIBS)
+initpri3b$(EXEEXT): $(initpri3b_OBJECTS) $(initpri3b_DEPENDENCIES) 
+	@rm -f initpri3b$(EXEEXT)
+	$(initpri3b_LINK) $(initpri3b_OBJECTS) $(initpri3b_LDADD) $(LIBS)
 justsyms$(EXEEXT): $(justsyms_OBJECTS) $(justsyms_DEPENDENCIES) 
 	@rm -f justsyms$(EXEEXT)
 	$(justsyms_LINK) $(justsyms_OBJECTS) $(justsyms_LDADD) $(LIBS)
@ -3034,6 +3065,7 @@ distclean-compile:
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/incremental_test_4.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/initpri1.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/initpri2.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/initpri3.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/justsyms_1.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/large-large.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/local_labels_test.Po@am__quote@
@ -3571,6 +3603,10 @@ initpri1.log: initpri1$(EXEEXT)
 	@p='initpri1$(EXEEXT)'; $(am__check_pre) $(LOG_COMPILE) "$$tst" $(am__check_post)
 initpri2.log: initpri2$(EXEEXT)
 	@p='initpri2$(EXEEXT)'; $(am__check_pre) $(LOG_COMPILE) "$$tst" $(am__check_post)
+initpri3a.log: initpri3a$(EXEEXT)
+	@p='initpri3a$(EXEEXT)'; $(am__check_pre) $(LOG_COMPILE) "$$tst" $(am__check_post)
+initpri3b.log: initpri3b$(EXEEXT)
+	@p='initpri3b$(EXEEXT)'; $(am__check_pre) $(LOG_COMPILE) "$$tst" $(am__check_post)
 flagstest_o_specialfile.log: flagstest_o_specialfile$(EXEEXT)
 	@p='flagstest_o_specialfile$(EXEEXT)'; $(am__check_pre) $(LOG_COMPILE) "$$tst" $(am__check_post)
 flagstest_compress_debug_sections.log: flagstest_compress_debug_sections$(EXEEXT)
--- a/gold/testsuite/initpri3.c
+++ b/gold/testsuite/initpri3.c
@ -0,0 +1,80 @@
+/* initpri3.c -- test ctor odering when using init_array.
+
+   Copyright 2011 Free Software Foundation, Inc.
+   Written by Ian Lance Taylor <iant@google.com>.
+
+   This file is part of gold.
+
+   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 of the License, 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; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+   MA 02110-1301, USA.  */
+
+/* This tests that the linker correctly orders .ctor entries when
+   putting them into .init_array, as is the default.  */
+
+#include <assert.h>
+
+int i = 1;
+
+static void
+ctor1 (void)
+{
+  assert (i == 1);
+  i = 2;
+}
+
+static void
+ctor2 (void)
+{
+  assert (i == 2);
+  i = 3;
+}
+
+static void
+dtor1 (void)
+{
+  assert (i == 3);
+  i = 2;
+}
+
+static void
+dtor2 (void)
+{
+  assert (i == 2);
+  i = 1;
+}
+
+/* The .ctors section is run in reverse order, the .dtors section in
+   run in forward order.  We give these arrays the "aligned" attribute
+   because the x86_64 ABI would otherwise give them a 16-byte
+   alignment, which may leave a hole in the section.  */
+
+void (*ctors[]) (void)
+  __attribute__ ((aligned (4), section (".ctors"))) = {
+  ctor2,
+  ctor1
+};
+
+void (*dtors[]) (void)
+  __attribute__ ((aligned (4), section (".dtors"))) = {
+  dtor1,
+  dtor2
+};
+
+int
+main (void)
+{
+  assert (i == 3);
+  return 0;
+}