[gold patch] Incremental 17/22: COPY relocations

[Cary Coutant]

>>               if (sym->source() == Symbol::FROM_OBJECT
>>                   && sym->object() == obj
>>                   && sym->is_defined())
>> -               def_flag = 1U << 31;
>> +               def_flag = 2U << 30;
>> +             else if (sym->is_copied_from_dynobj()
>> +                      && this->symtab_->get_copy_source(sym) == dynobj)
>> +               def_flag = 3U << 30;
>
> Let's give some names to 1U, 2U, 3U, and 30.

Done. I added these:

	* incremental.h (enum Incremental_shlib_symbol_flags): New type.
	(INCREMENTAL_SHLIB_SYM_FLAGS_SHIFT): New constant.

>> -      *is_def = (output_symndx & (1U << 31)) != 0;
>> -      return output_symndx & ((1U << 31) - 1);
>> +      *is_def = (output_symndx >> 31) == 1;
>> +      *is_copy = (output_symndx >> 30) == 3;
>> +      return output_symndx & ((1U << 30) - 1);
>
> This is kind of tricky considering how the bits are set; better to use a
> switch on output_symndx >> 30, I think.

Done.

> This is OK with those changes.

Thanks, committed. Updated ChangeLog below.

>> (I split a couple of patches and added a couple, so the total patch
>> count is now up to 22.)
>
> Don't think I didn't notice that you're up to 25 now.

Heh, heh. I'll stop numbering them now.

-cary


	* copy-relocs.cc (Copy_relocs::copy_reloc): Call make_copy_reloc
	instead of emit_copy_reloc.
	(Copy_relocs::emit_copy_reloc): Refactor.
	(Copy_relocs::make_copy_reloc): New function.
	(Copy_relocs::add_copy_reloc): Remove.
	* copy-relocs.h (Copy_relocs::emit_copy_reloc): Move to public
	section.
	(Copy_relocs::make_copy_reloc): New function.
	(Copy_relocs::add_copy_reloc): Remove.
	* gold.cc (queue_middle_tasks): Emit old COPY relocations from
	unchanged input files.
	* incremental-dump.cc (dump_incremental_inputs): Print "COPY" flag.
	* incremental.cc (Sized_incremental_binary::do_reserve_layout):
	Reserve BSS space for COPY relocations.
	(Sized_incremental_binary::do_emit_copy_relocs): New function.
	(Output_section_incremental_inputs::write_info_blocks): Record
	whether a symbol is copied from a shared object.
	(Sized_incr_dynobj::do_add_symbols): Record COPY relocations.
	* incremental.h (enum Incremental_shlib_symbol_flags): New type.
	(INCREMENTAL_SHLIB_SYM_FLAGS_SHIFT): New constant.
	(Incremental_input_entry_reader::get_output_symbol_index): Add
	is_copy parameter.
	(Incremental_binary::emit_copy_relocs): New function.
	(Incremental_binary::do_emit_copy_relocs): New function.
	(Sized_incremental_binary::Sized_incremental_binary): Initialize
	new data member.
	(Sized_incremental_binary::add_copy_reloc): New function.
	(Sized_incremental_binary::do_emit_copy_relocs): New function.
	(Sized_incremental_binary::Copy_reloc): New struct.
	(Sized_incremental_binary::Copy_relocs): New typedef.
	(Sized_incremental_binary::copy_relocs_): New data member.
	* symtab.cc (Symbol_table::add_from_incrobj): Change return type.
	* symtab.h (Symbol_table::add_from_incrobj): Change return type.
	* target.h (Sized_target::emit_copy_reloc): New function.
	* x86_64.cc (Target_x86_64::emit_copy_reloc): New function.