From: Alan Modra <amodra@gmail.com>
Date: Tue, 12 Mar 2013 00:42:14 +0000 (+0000)
Subject: 	* gc.h (gc_process_relocs): Look through function descriptors
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=57420c208463c85912f56abf49ce9f3546f9fbe7;p=binutils-gdb.git

	* gc.h (gc_process_relocs): Look through function descriptors
	to determine shndx, symvalue and addend used by ICF.  Tidy
	variable duplication.
---

diff --git a/gold/ChangeLog b/gold/ChangeLog
index fcbfed4c792..e859a5e1f2a 100644
--- a/gold/ChangeLog
+++ b/gold/ChangeLog
@@ -1,3 +1,9 @@
+2013-03-12  Alan Modra  <amodra@gmail.com>
+
+	* gc.h (gc_process_relocs): Look through function descriptors
+	to determine shndx, symvalue and addend used by ICF.  Tidy
+	variable duplication.
+
 2013-03-11  Alan Modra  <amodra@gmail.com>
 
 	* gold.cc (queue_middle_tasks): Move detect_odr_violations..
diff --git a/gold/gc.h b/gold/gc.h
index a1691514273..6930aced431 100644
--- a/gold/gc.h
+++ b/gold/gc.h
@@ -235,30 +235,45 @@ gc_process_relocs(
       Reloc_types<sh_type, size, big_endian>::get_reloc_addend_noerror(&reloc);
       Object* dst_obj;
       unsigned int dst_indx;
-      typename elfcpp::Elf_types<size>::Elf_Addr dst_off;
+      typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
+      Address dst_off;
 
       if (r_sym < local_count)
         {
           gold_assert(plocal_syms != NULL);
           typename elfcpp::Sym<size, big_endian> lsym(plocal_syms
                                                       + r_sym * sym_size);
-          unsigned int shndx = lsym.get_st_shndx();
+	  dst_indx = lsym.get_st_shndx();
           bool is_ordinary;
-          shndx = src_obj->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
+	  dst_indx = src_obj->adjust_sym_shndx(r_sym, dst_indx, &is_ordinary);
           dst_obj = src_obj;
-          dst_indx = shndx;
-	  dst_off = lsym.get_st_value();
+	  dst_off = lsym.get_st_value() + addend;
 
           if (is_icf_tracked)
             {
+	      Address symvalue = dst_off - addend;
 	      if (is_ordinary) 
-                (*secvec).push_back(Section_id(dst_obj, dst_indx));
+		{
+		  Symbol_location loc;
+		  loc.object = dst_obj;
+		  loc.shndx = dst_indx;
+		  loc.offset = convert_types<off_t, Address>(dst_off);
+		  // Look through function descriptors.
+		  parameters->target().function_location(&loc);
+		  if (loc.shndx != dst_indx)
+		    {
+		      // Modify symvalue/addend to the code entry.
+		      symvalue = loc.offset;
+		      addend = 0;
+		    }
+		  (*secvec).push_back(Section_id(loc.object, loc.shndx));
+		}
 	      else
                 (*secvec).push_back(Section_id(NULL, 0));
               (*symvec).push_back(NULL);
-              long long symvalue = static_cast<long long>(lsym.get_st_value());
-              (*addendvec).push_back(std::make_pair(symvalue,
-                                              static_cast<long long>(addend)));
+	      (*addendvec).push_back(std::make_pair(
+					static_cast<long long>(symvalue),
+					static_cast<long long>(addend)));
               uint64_t reloc_offset =
                 convert_to_section_size_type(reloc.get_r_offset());
 	      (*offsetvec).push_back(reloc_offset);
@@ -279,7 +294,7 @@ gc_process_relocs(
             symtab->icf()->set_section_has_function_pointers(
               src_obj, lsym.get_st_shndx());
 
-          if (!is_ordinary || shndx == src_indx)
+          if (!is_ordinary || dst_indx == src_indx)
             continue;
         }
       else
@@ -291,14 +306,14 @@ gc_process_relocs(
 
           dst_obj = NULL;
           dst_indx = 0;
-	  dst_off = 0;
           bool is_ordinary = false;
           if (gsym->source() == Symbol::FROM_OBJECT)
             {
               dst_obj = gsym->object();
               dst_indx = gsym->shndx(&is_ordinary);
-	      dst_off = static_cast<const Sized_symbol<size>*>(gsym)->value();
             }
+	  dst_off = static_cast<const Sized_symbol<size>*>(gsym)->value();
+	  dst_off += addend;
 
 	  // When doing safe folding, check to see if this relocation is that
 	  // of a function pointer being taken.
@@ -326,17 +341,29 @@ gc_process_relocs(
             }
           if (is_icf_tracked)
             {
+	      Address symvalue = dst_off - addend;
               if (is_ordinary && gsym->source() == Symbol::FROM_OBJECT)
-                (*secvec).push_back(Section_id(dst_obj, dst_indx));
+		{
+		  Symbol_location loc;
+		  loc.object = dst_obj;
+		  loc.shndx = dst_indx;
+		  loc.offset = convert_types<off_t, Address>(dst_off);
+		  // Look through function descriptors.
+		  parameters->target().function_location(&loc);
+		  if (loc.shndx != dst_indx)
+		    {
+		      // Modify symvalue/addend to the code entry.
+		      symvalue = loc.offset;
+		      addend = 0;
+		    }
+		  (*secvec).push_back(Section_id(loc.object, loc.shndx));
+		}
 	      else
                 (*secvec).push_back(Section_id(NULL, 0));
               (*symvec).push_back(gsym);
-              Sized_symbol<size>* sized_gsym =
-                        static_cast<Sized_symbol<size>* >(gsym);
-              long long symvalue =
-                        static_cast<long long>(sized_gsym->value());
-              (*addendvec).push_back(std::make_pair(symvalue,
-                                        static_cast<long long>(addend)));
+	      (*addendvec).push_back(std::make_pair(
+					static_cast<long long>(symvalue),
+					static_cast<long long>(addend)));
               uint64_t reloc_offset =
                 convert_to_section_size_type(reloc.get_r_offset());
 	      (*offsetvec).push_back(reloc_offset);
@@ -353,7 +380,6 @@ gc_process_relocs(
       if (parameters->options().gc_sections())
         {
 	  symtab->gc()->add_reference(src_obj, src_indx, dst_obj, dst_indx);
-	  dst_off += addend;
 	  parameters->sized_target<size, big_endian>()
 	    ->gc_add_reference(symtab, src_obj, src_indx,
 			       dst_obj, dst_indx, dst_off);