Make linker scripts and section ordering via --section-ordering-file or

linker plugins work. This patch lets linker scripts take precedence.

2013-01-09  Sriraman Tallam  <tmsriram@google.com>

	* output.h (sort_attached_input_sections): Change to be public.
	* script-sections.cc
	(Output_section_definition::set_section_addresses): Sort
	attached input sections according to section order before linker
	script assigns section addresses.
	(Orphan_output_section::set_section_addresses): Sort
	attached input sections according to section order before linker
	script assigns section addresses.
	* Makefile.am (final_layout.sh): Use a simple linker script to
	check if section ordering still works.
	* Makefile.in: Regenerate.

diff --git a/gold/ChangeLog b/gold/ChangeLog
index 1ee71dd..72271fa 100644 (file)
--- a/gold/ChangeLog
+++ b/gold/ChangeLog
@@ -1,3 +1,17 @@
+2013-01-09  Sriraman Tallam  <tmsriram@google.com>
+
+       * output.h (sort_attached_input_sections): Change to be public.
+       * script-sections.cc
+       (Output_section_definition::set_section_addresses): Sort
+       attached input sections according to section order before linker
+       script assigns section addresses.
+       (Orphan_output_section::set_section_addresses): Sort
+       attached input sections according to section order before linker
+       script assigns section addresses.
+       * Makefile.am (final_layout.sh): Use a simple linker script to
+       check if section ordering still works.
+       * Makefile.in: Regenerate.
+
 2013-01-09  Ben Cheng  <bccheng@google.com>
 
        * arm.cc (Target_arm::attributes_accept_div): New function.

diff --git a/gold/output.h b/gold/output.h
index a8fe594..8f3943b 100644 (file)
--- a/gold/output.h
+++ b/gold/output.h
@@ -3300,6 +3300,10 @@ class Output_section : public Output_data
     this->dynsym_index_ = index;
   }
 
+  // Sort the attached input sections.
+  void
+  sort_attached_input_sections();
+
   // Return whether the input sections sections attachd to this output
   // section may require sorting.  This is used to handle constructor
   // priorities compatibly with GNU ld.
@@ -4253,10 +4257,6 @@ class Output_section : public Output_data
   add_output_merge_section(Output_section_data* posd, bool is_string,
                           uint64_t entsize);
 
-  // Sort the attached input sections.
-  void
-  sort_attached_input_sections();
-
   // Find the merge section into which an input section with index SHNDX in
   // OBJECT has been added.  Return NULL if none found.
   Output_section_data*

diff --git a/gold/script-sections.cc b/gold/script-sections.cc
index e5d3a93..2fb8cbb 100644 (file)
--- a/gold/script-sections.cc
+++ b/gold/script-sections.cc
@@ -2294,6 +2294,15 @@ Output_section_definition::set_section_addresses(Symbol_table* symtab,
   uint64_t old_dot_value = *dot_value;
   uint64_t old_load_address = *load_address;
 
+  // If input section sorting is requested via --section-ordering-file or
+  // linker plugins, then do it here.  This is important because we want 
+  // any sorting specified in the linker scripts, which will be done after
+  // this, to take precedence.  The final order of input sections is then 
+  // guaranteed to be according to the linker script specification.
+  if (this->output_section_ != NULL
+      && this->output_section_->input_section_order_specified())
+    this->output_section_->sort_attached_input_sections();
+
   // Decide the start address for the section.  The algorithm is:
   // 1) If an address has been specified in a linker script, use that.
   // 2) Otherwise if a memory region has been specified for the section,
@@ -2865,6 +2874,15 @@ Orphan_output_section::set_section_addresses(Symbol_table*, Layout*,
   uint64_t address = *dot_value;
   address = align_address(address, this->os_->addralign());
 
+  // If input section sorting is requested via --section-ordering-file or
+  // linker plugins, then do it here.  This is important because we want 
+  // any sorting specified in the linker scripts, which will be done after
+  // this, to take precedence.  The final order of input sections is then 
+  // guaranteed to be according to the linker script specification.
+  if (this->os_ != NULL
+      && this->os_->input_section_order_specified())
+    this->os_->sort_attached_input_sections();
+
   // For a relocatable link, all orphan sections are put at
   // address 0.  In general we expect all sections to be at
   // address 0 for a relocatable link, but we permit the linker

diff --git a/gold/testsuite/Makefile.am b/gold/testsuite/Makefile.am
index 74621e9..e5f445a 100644 (file)
--- a/gold/testsuite/Makefile.am
+++ b/gold/testsuite/Makefile.am
@@ -246,13 +246,15 @@ icf_safe_so_test_2.stdout: icf_safe_so_test
 
 check_SCRIPTS += final_layout.sh
 check_DATA += final_layout.stdout
-MOSTLYCLEANFILES += final_layout final_layout_sequence.txt
+MOSTLYCLEANFILES += final_layout final_layout_sequence.txt final_layout_script.lds
 final_layout.o: final_layout.cc
        $(CXXCOMPILE) -O0 -c -ffunction-sections  -fdata-sections -g -o $@ $<
 final_layout_sequence.txt:
        (echo "*_Z3barv*" && echo ".text._Z3bazv" && echo "*_Z3foov*" && echo "*global_varb*" && echo "*global_vara*" && echo "*global_varc*") > final_layout_sequence.txt
-final_layout: final_layout.o final_layout_sequence.txt gcctestdir/ld
-       $(CXXLINK) -Bgcctestdir/ -Wl,--section-ordering-file,final_layout_sequence.txt final_layout.o
+final_layout_script.lds:
+       (echo "SECTIONS { .text : { *(.text*) } .bss : { *(.bss*) } }") > final_layout_script.lds
+final_layout: final_layout.o final_layout_sequence.txt final_layout_script.lds gcctestdir/ld
+       $(CXXLINK) -Bgcctestdir/ -Wl,--section-ordering-file,final_layout_sequence.txt -Wl,-T,final_layout_script.lds final_layout.o
 final_layout.stdout: final_layout
        $(TEST_NM) -n --synthetic final_layout > final_layout.stdout
 

diff --git a/gold/testsuite/Makefile.in b/gold/testsuite/Makefile.in
index f829774..6e22934 100644 (file)
--- a/gold/testsuite/Makefile.in
+++ b/gold/testsuite/Makefile.in
@@ -125,6 +125,7 @@ check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@ icf_safe_test icf_safe_so_test \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@ final_layout \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@ final_layout_sequence.txt \
+@GCC_TRUE@@NATIVE_LINKER_TRUE@ final_layout_script.lds \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@ text_section_grouping \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@ icf_virtual_function_folding_test \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@ icf_preemptible_functions_test \
@@ -4355,8 +4356,10 @@ uninstall-am:
 @GCC_TRUE@@NATIVE_LINKER_TRUE@ $(CXXCOMPILE) -O0 -c -ffunction-sections  -fdata-sections -g -o $@ $<
 @GCC_TRUE@@NATIVE_LINKER_TRUE@final_layout_sequence.txt:
 @GCC_TRUE@@NATIVE_LINKER_TRUE@ (echo "*_Z3barv*" && echo ".text._Z3bazv" && echo "*_Z3foov*" && echo "*global_varb*" && echo "*global_vara*" && echo "*global_varc*") > final_layout_sequence.txt
-@GCC_TRUE@@NATIVE_LINKER_TRUE@final_layout: final_layout.o final_layout_sequence.txt gcctestdir/ld
-@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(CXXLINK) -Bgcctestdir/ -Wl,--section-ordering-file,final_layout_sequence.txt final_layout.o
+@GCC_TRUE@@NATIVE_LINKER_TRUE@final_layout_script.lds:
+@GCC_TRUE@@NATIVE_LINKER_TRUE@ (echo "SECTIONS { .text : { *(.text*) } .bss : { *(.bss*) } }") > final_layout_script.lds
+@GCC_TRUE@@NATIVE_LINKER_TRUE@final_layout: final_layout.o final_layout_sequence.txt final_layout_script.lds gcctestdir/ld
+@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(CXXLINK) -Bgcctestdir/ -Wl,--section-ordering-file,final_layout_sequence.txt -Wl,-T,final_layout_script.lds final_layout.o
 @GCC_TRUE@@NATIVE_LINKER_TRUE@final_layout.stdout: final_layout
 @GCC_TRUE@@NATIVE_LINKER_TRUE@ $(TEST_NM) -n --synthetic final_layout > final_layout.stdout
 @GCC_TRUE@@NATIVE_LINKER_TRUE@text_section_grouping.o: text_section_grouping.cc