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-rw-r--r--gold/ChangeLog25
-rw-r--r--gold/layout.cc51
-rw-r--r--gold/layout.h6
-rw-r--r--gold/object.h9
-rw-r--r--gold/reloc.cc34
-rw-r--r--gold/testsuite/Makefile.am12
-rw-r--r--gold/testsuite/Makefile.in52
-rw-r--r--gold/testsuite/initpri3.c80
8 files changed, 253 insertions, 16 deletions
diff --git a/gold/ChangeLog b/gold/ChangeLog
index fe06e41..ff39a18 100644
--- 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.
diff --git a/gold/layout.cc b/gold/layout.cc
index 82964ce..bfb1a7e 100644
--- 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();
diff --git a/gold/layout.h b/gold/layout.h
index 3eee820..0f6840e 100644
--- 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
diff --git a/gold/object.h b/gold/object.h
index 1031833..8735f9e 100644
--- 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,
diff --git a/gold/reloc.cc b/gold/reloc.cc
index dacab35..4c28b03 100644
--- 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>
diff --git a/gold/testsuite/Makefile.am b/gold/testsuite/Makefile.am
index ca486cf..d075cdc 100644
--- 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
diff --git a/gold/testsuite/Makefile.in b/gold/testsuite/Makefile.in
index 20171bf..10bce4e 100644
--- 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)
diff --git a/gold/testsuite/initpri3.c b/gold/testsuite/initpri3.c
new file mode 100644
index 0000000..01e233d
--- /dev/null
+++ 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;
+}
generated by cgit v1.1 at 2024-08-04 16:20:08 +0000