[PATCH] PR gold/18695

[Cary Coutant]

>> Shouldn't there be generic address overflow checks which can be used
>> by all targets?
>
> As for me I am not sure it is really needed.

There are, in reloc.h, but the functions in the Relocate_functions
class needed some overhaul, and the routines in the Bits class were
missing unsigned overflow checks. I've just committed the attached
patch to add overflow-checking versions of the generic relocation
functions. The new routines return a Reloc_status that indicates
whether the relocation overflowed.

-cary


2016-02-06  Cary Coutant  <ccoutant@gmail.com>

gold/
        PR gold/18695
        * reloc.h (Relocate_functions::Address): New typedef.
        (Relocate_functions::Addendtype): New typedef.
        (Relocate_functions::Overflow_check): New enum type.
        (Relocate_functions::Reloc_status): New enum type.
        (Relocate_functions::check_overflow): New function template.
        (Relocate_functions::rel): Add check parameter; check for overflow.
        (Relocate_functions::rel_unaligned): Likewise.
        (Relocate_functions::rela): Likewise.
        (Relocate_functions::pcrel): Likewise.
        (Relocate_functions::pcrel_unaligned): Likewise.
        (Relocate_functions::pcrela): Likewise.
        (Relocate_functions::rel8): Adjust parameter types.
        (Relocate_functions::rela8): Likewise.
        (Relocate_functions::pcrel8): Likewise.
        (Relocate_functions::pcrela8): Likewise.
        (Relocate_functions::rel16): Likewise.
        (Relocate_functions::rela168): Likewise.
        (Relocate_functions::pcrel16): Likewise.
        (Relocate_functions::pcrela16): Likewise.
        (Relocate_functions::rel32): Likewise.
        (Relocate_functions::rel32_unaligned): Likewise.
        (Relocate_functions::rela32): Likewise.
        (Relocate_functions::pcrel32): Likewise.
        (Relocate_functions::pcrel32_unaligned): Likewise.
        (Relocate_functions::pcrela32): Likewise.
        (Relocate_functions::rel8_check): New function.
        (Relocate_functions::rela8_check): New function.
        (Relocate_functions::pcrel8_check): New function.
        (Relocate_functions::pcrela8_check): New function.
        (Relocate_functions::rel16_check): New function.
        (Relocate_functions::rela168_check): New function.
        (Relocate_functions::pcrel16_check): New function.
        (Relocate_functions::pcrela16_check): New function.
        (Relocate_functions::rel32_check): New function.
        (Relocate_functions::rel32_unaligned_check): New function.
        (Relocate_functions::rela32_check): New function.
        (Relocate_functions::pcrel32_check): New function.
        (Relocate_functions::pcrel32_unaligned_check): New function.
        (Relocate_functions::pcrela32_check): New function.
        (Bits::has_unsigned_overflow32): New function.
        (Bits::has_unsigned_overflow): New function.
        * testsuite/Makefile.am (overflow_unittest): New test.
        * testsuite/Makefile.in: Regenerate.
        * testsuite/overflow_unittest.cc: New source file.
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