// reloc.cc -- relocate input files for gold.
-// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
{
Read_relocs_data *rd = new Read_relocs_data;
this->object_->read_relocs(rd);
+ this->object_->set_relocs_data(rd);
this->object_->release();
- workqueue->queue_next(new Scan_relocs(this->options_, this->symtab_,
- this->layout_, this->object_, rd,
- this->symtab_lock_, this->blocker_));
+ // If garbage collection is desired, we must process the relocs
+ // instead of scanning the relocs as reloc processing is necessary
+ // to determine unused sections.
+ if (parameters->options().gc_sections())
+ {
+ workqueue->queue_next(new Gc_process_relocs(this->options_,
+ this->symtab_,
+ this->layout_,
+ this->object_, rd,
+ this->symtab_lock_,
+ this->blocker_));
+ }
+ else
+ {
+ workqueue->queue_next(new Scan_relocs(this->options_, this->symtab_,
+ this->layout_, this->object_, rd,
+ this->symtab_lock_,
+ this->blocker_));
+ }
}
// Return a debugging name for the task.
return "Read_relocs " + this->object_->name();
}
+// Gc_process_relocs methods.
+
+// These tasks process the relocations read by Read_relocs and
+// determine which sections are referenced and which are garbage.
+// This task is done only when --gc-sections is used.
+
+Task_token*
+Gc_process_relocs::is_runnable()
+{
+ if (this->object_->is_locked())
+ return this->object_->token();
+ return NULL;
+}
+
+void
+Gc_process_relocs::locks(Task_locker* tl)
+{
+ tl->add(this, this->object_->token());
+ tl->add(this, this->blocker_);
+}
+
+void
+Gc_process_relocs::run(Workqueue*)
+{
+ this->object_->gc_process_relocs(this->options_, this->symtab_, this->layout_,
+ this->rd_);
+ this->object_->release();
+}
+
+// Return a debugging name for the task.
+
+std::string
+Gc_process_relocs::get_name() const
+{
+ return "Gc_process_relocs " + this->object_->name();
+}
+
// Scan_relocs methods.
// These tasks scan the relocations read by Read_relocs and mark up
// PLT sections. Relocations for sections which are not
// allocated (typically debugging sections) should not add new
// GOT and PLT entries. So we skip them unless this is a
- // relocatable link or we need to emit relocations.
+ // relocatable link or we need to emit relocations. FIXME: What
+ // should we do if a linker script maps a section with SHF_ALLOC
+ // clear to a section with SHF_ALLOC set?
typename This::Shdr secshdr(pshdrs + shndx * This::shdr_size);
bool is_section_allocated = ((secshdr.get_sh_flags() & elfcpp::SHF_ALLOC)
!= 0);
sr.sh_type = sh_type;
sr.reloc_count = reloc_count;
sr.output_section = os;
- sr.needs_special_offset_handling = out_offsets[shndx] == -1U;
+ sr.needs_special_offset_handling = out_offsets[shndx] == invalid_address;
sr.is_data_section_allocated = is_section_allocated;
}
}
}
+// Process the relocs to generate mappings from source sections to referenced
+// sections. This is used during garbage colletion to determine garbage
+// sections.
+
+template<int size, bool big_endian>
+void
+Sized_relobj<size, big_endian>::do_gc_process_relocs(const General_options& options,
+ Symbol_table* symtab,
+ Layout* layout,
+ Read_relocs_data* rd)
+{
+ Sized_target<size, big_endian>* target = this->sized_target();
+
+ const unsigned char* local_symbols;
+ if (rd->local_symbols == NULL)
+ local_symbols = NULL;
+ else
+ local_symbols = rd->local_symbols->data();
+
+ for (Read_relocs_data::Relocs_list::iterator p = rd->relocs.begin();
+ p != rd->relocs.end();
+ ++p)
+ {
+ if (!parameters->options().relocatable())
+ {
+ // As noted above, when not generating an object file, we
+ // only scan allocated sections. We may see a non-allocated
+ // section here if we are emitting relocs.
+ if (p->is_data_section_allocated)
+ target->gc_process_relocs(options, symtab, layout, this,
+ p->data_shndx, p->sh_type,
+ p->contents->data(), p->reloc_count,
+ p->output_section,
+ p->needs_special_offset_handling,
+ this->local_symbol_count_,
+ local_symbols);
+ }
+ }
+}
+
+
// Scan the relocs and adjust the symbol table. This looks for
// relocations which require GOT/PLT/COPY relocations.
p != rd->relocs.end();
++p)
{
+ // When garbage collection is on, unreferenced sections are not included
+ // in the link that would have been included normally. This is known only
+ // after Read_relocs hence this check has to be done again.
+ if (parameters->options().gc_sections())
+ {
+ if (p->output_section == NULL)
+ continue;
+ }
if (!parameters->options().relocatable())
{
// As noted above, when not generating an object file, we
public:
// A local non-section symbol.
inline Relocatable_relocs::Reloc_strategy
- local_non_section_strategy(unsigned int, Relobj*)
+ local_non_section_strategy(unsigned int, Relobj*, unsigned int)
{ return Relocatable_relocs::RELOC_COPY; }
// A local section symbol.
// In the normal case, this input section is simply mapped to
// the output section at offset OUTPUT_OFFSET.
- // However, if OUTPUT_OFFSET == -1U, then input data is handled
- // specially--e.g., a .eh_frame section. The relocation
+ // However, if OUTPUT_OFFSET == INVALID_ADDRESS, then input data is
+ // handled specially--e.g., a .eh_frame section. The relocation
// routines need to check for each reloc where it should be
// applied. For this case, we need an input/output view for the
// entire contents of the section in the output file. We don't
off_t view_start;
section_size_type view_size;
- if (output_offset != -1U)
+ if (output_offset != invalid_address)
{
view_start = output_section_offset + output_offset;
view_size = convert_to_section_size_type(shdr.get_sh_size());
if (view_size == 0)
continue;
- gold_assert(output_offset == -1U
+ gold_assert(output_offset == invalid_address
|| output_offset + view_size <= output_section_size);
unsigned char* view;
{
unsigned char* buffer = os->postprocessing_buffer();
view = buffer + view_start;
- if (output_offset != -1U)
+ if (output_offset != invalid_address)
{
off_t sh_offset = shdr.get_sh_offset();
if (!rm.empty() && rm.back().file_offset > sh_offset)
}
else
{
- if (output_offset == -1U)
+ if (output_offset == invalid_address)
view = of->get_input_output_view(view_start, view_size);
else
{
pvs->view = view;
pvs->address = os->address();
- if (output_offset != -1U)
+ if (output_offset != invalid_address)
pvs->address += output_offset;
pvs->offset = view_start;
pvs->view_size = view_size;
- pvs->is_input_output_view = output_offset == -1U;
+ pvs->is_input_output_view = output_offset == invalid_address;
pvs->is_postprocessing_view = os->requires_postprocessing();
}
continue;
}
- gold_assert(output_offset != -1U
+ gold_assert(output_offset != invalid_address
|| this->relocs_must_follow_section_writes());
relinfo.reloc_shndx = i;
prelocs,
reloc_count,
os,
- output_offset == -1U,
+ output_offset == invalid_address,
(*pviews)[index].view,
(*pviews)[index].address,
(*pviews)[index].view_size);
Sized_relobj<64, true>::do_read_relocs(Read_relocs_data* rd);
#endif
+#ifdef HAVE_TARGET_32_LITTLE
+template
+void
+Sized_relobj<32, false>::do_gc_process_relocs(const General_options& options,
+ Symbol_table* symtab,
+ Layout* layout,
+ Read_relocs_data* rd);
+#endif
+
+#ifdef HAVE_TARGET_32_BIG
+template
+void
+Sized_relobj<32, true>::do_gc_process_relocs(const General_options& options,
+ Symbol_table* symtab,
+ Layout* layout,
+ Read_relocs_data* rd);
+#endif
+
+#ifdef HAVE_TARGET_64_LITTLE
+template
+void
+Sized_relobj<64, false>::do_gc_process_relocs(const General_options& options,
+ Symbol_table* symtab,
+ Layout* layout,
+ Read_relocs_data* rd);
+#endif
+
+#ifdef HAVE_TARGET_64_BIG
+template
+void
+Sized_relobj<64, true>::do_gc_process_relocs(const General_options& options,
+ Symbol_table* symtab,
+ Layout* layout,
+ Read_relocs_data* rd);
+#endif
+
#ifdef HAVE_TARGET_32_LITTLE
template
void