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Add support for the notion of "hidden" relocations. On MachO, these are relocation entries that are used as additional information for other, real relocations, rather than being relocations themselves.

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I'm not familiar enough with ELF or COFF to know if they should have any relocations marked hidden.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142961 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson
2011-10-25 20:35:53 +00:00
parent f62333df5e
commit 0685e94895
4 changed files with 55 additions and 0 deletions
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32
lib/Object/MachOObjectFile.cpp
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@ -952,6 +952,38 @@ error_code MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
return object_error::success;
}
error_code MachOObjectFile::getRelocationHidden(DataRefImpl Rel,
bool &Result) const {
InMemoryStruct<macho::RelocationEntry> RE;
getRelocation(Rel, RE);
unsigned Type = (RE->Word1 >> 28) & 0xF;
unsigned Arch = getArch();
Result = false;
// On arches that use the generic relocations, GENERIC_RELOC_PAIR
// is always hidden.
if (Arch == Triple::x86 || Arch == Triple::arm) {
if (Type == 1) Result = true;
} else if (Arch == Triple::x86_64) {
// On x86_64, X86_64_RELOC_UNSIGNED is hidden only when it follows
// an X864_64_RELOC_SUBTRACTOR.
if (Type == 0 && Rel.d.a > 0) {
DataRefImpl RelPrev = Rel;
RelPrev.d.a--;
InMemoryStruct<macho::RelocationEntry> REPrev;
getRelocation(RelPrev, REPrev);
unsigned PrevType = (REPrev->Word1 >> 28) & 0xF;
if (PrevType == 5) Result = true;
}
}
return object_error::success;
}
/*===-- Miscellaneous -----------------------------------------------------===*/
uint8_t MachOObjectFile::getBytesInAddress() const {