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[ELF] add elf_hash function to compute the hash value of a symbol in the dynamic symbol table

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177872 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Shankar Easwaran 2013-03-25 16:02:10 +00:00
parent 6a19f7b9de
commit 11987c4719
1 changed files with 15 additions and 0 deletions
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15
include/llvm/Object/ELF.h
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@ -2704,6 +2704,21 @@ static inline error_code GetELFSymbolVersion(const ObjectFile *Obj,
llvm_unreachable("Object passed to GetELFSymbolVersion() is not ELF");
}
/// This function returns the hash value for a symbol in the .dynsym section
/// Name of the API remains consistent as specified in the libelf
/// REF : http://eternallyconfuzzled.com/tuts/algorithms/jsw_tut_hashing.aspx
static inline unsigned elf_hash(StringRef &symbolName) {
unsigned h = 0, g;
for (unsigned i = 0; i < symbolName.size(); i++) {
h = (h << 4) + symbolName[i];
g = h & 0xf0000000L;
if (g != 0)
h ^= g >> 24;
h &= ~g;
}
return h;
}
}
}