[PATCH][GOLD] Use offsets within output sections during a relocatable link.

Ian Lance Taylor iant@google.com
Wed May 26 18:24:00 GMT 2010


"Doug Kwan (關振德)" <dougkwan@google.com> writes:

> I used uint64_t because START and Output_section::address() are of
> type uint64_t.  I can certainly change that to Address.

Both of those are uint64_t because they are from calls to functions
which are not templated.  The values must still fit in
Sized_relobj<>::Address.

Ian

> 在 2010年5月27日上午1:32,Ian Lance Taylor <iant@google.com> 寫道:
>> "Doug Kwan (關振德)" <dougkwan@google.com> writes:
>>
>>> 2010-05-27  Doug Kwan  <dougkwan@google.com>
>>>
>>>         * object.cc (Sized_relobj::do_finalize_local_symbols): Use offset
>>>         from start of output section instead of address for a local symbol
>>>         in a merged or relaxed section when doing a relocatable link.
>>
>> Thanks for finding this.
>>
>>
>>> --- gold/object.cc    26 May 2010 15:47:39 -0000      1.123
>>> +++ gold/object.cc    26 May 2010 15:57:55 -0000
>>> @@ -1827,7 +1827,12 @@ Sized_relobj<size, big_endian>::do_final
>>>                 const Output_section_data* posd =
>>>                   os->find_relaxed_input_section(this, shndx);
>>>                 if (posd != NULL)
>>> -                 lv.set_output_value(posd->address());
>>> +                 {
>>> +                   uint64_t relocatable_link_adjustment =
>>> +                     relocatable ? os->address() : 0;
>>> +                   lv.set_output_value(posd->address()
>>> +                                       - relocatable_link_adjustment);
>>> +                 }
>>
>> This is a template function.  The variable relocation_link_adjustment
>> should have type Address (a typedef in Sized_relobj), not uint64_t.
>>
>>
>>> @@ -1835,9 +1840,14 @@ Sized_relobj<size, big_endian>::do_final
>>>               {
>>>                 // We have to consider the addend to determine the
>>>                 // value to use in a relocation.  START is the start
>>> -               // of this input section.
>>> +               // of this input section.  If we are doing a relocatable
>>> +               // link, use offset from start output section instead of
>>> +               // address.
>>> +               uint64_t adjusted_start =
>>> +                 relocatable ? start - os->address() : start;
>>>                 Merged_symbol_value<size>* msv =
>>> -                 new Merged_symbol_value<size>(lv.input_value(), start);
>>> +                 new Merged_symbol_value<size>(lv.input_value(),
>>> +                                               adjusted_start);
>>>                 lv.set_merged_symbol_value(msv);
>>>               }
>>>           }
>>
>> Here too, for the variable adjusted_start.
>>
>> This is OK with those changes.
>>
>> Thanks.
>>
>> Ian
>>



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