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The PPCAsmBackend::applyFixup routine handles the case where a fixup can be resolved within the same object file. However, this routine is currently hard-coded to assume the size of any fixup is always exactly 4 bytes. This is sort-of correct for fixups on instruction text; even though it only works because several of what really would be 2-byte fixups are presented as 4-byte fixups instead (requiring another hack in PPCELFObjectWriter::adjustFixupOffset to clean it up). However, this assumption breaks down completely for fixups on data, which legitimately can be of any size (1, 2, 4, or 8). This patch makes applyFixup aware of fixups of varying sizes, introducing a new helper routine getFixupKindNumBytes (along the lines of what the ARM back end does). Note that in order to handle fixups of size 8, we also need to fix the return type of adjustFixupValue to uint64_t to avoid truncation. Tested on both 64-bit and 32-bit PowerPC, using external and integrated assembler. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181891 91177308-0d34-0410-b5e6-96231b3b80d8
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