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Object/COFF: Define coff_symbol_generic.

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If you only need Name and Value fields in the COFF symbol,
you don't need to distinguish 32 bit and 64 bit COFF symbols.
These fields start at the same offsets and have the same size.

This data strucutre is one pointer smaller than COFFSymbolRef
thus slightly efficient. I'll use this class in LLD as we create
millions of LLD symbol objects that currently contain COFFSymbolRef.
Shaving off 8 byte (or 4 byte on 32 bit) from that class actually
matters becasue of the number of objects we create in LLD.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241024 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rui Ueyama
2015-06-30 00:03:56 +00:00
parent 2edab1ac31
commit 13b58ec74a
2 changed files with 27 additions and 6 deletions
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16
lib/Object/COFFObjectFile.cpp
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@ -847,20 +847,24 @@ std::error_code COFFObjectFile::getString(uint32_t Offset,
std::error_code COFFObjectFile::getSymbolName(COFFSymbolRef Symbol,
StringRef &Res) const {
return getSymbolName(Symbol.getGeneric(), Res);
}
std::error_code COFFObjectFile::getSymbolName(const coff_symbol_generic *Symbol,
StringRef &Res) const {
// Check for string table entry. First 4 bytes are 0.
if (Symbol.getStringTableOffset().Zeroes == 0) {
uint32_t Offset = Symbol.getStringTableOffset().Offset;
if (std::error_code EC = getString(Offset, Res))
if (Symbol->Name.Offset.Zeroes == 0) {
if (std::error_code EC = getString(Symbol->Name.Offset.Offset, Res))
return EC;
return std::error_code();
}
if (Symbol.getShortName()[COFF::NameSize - 1] == 0)
if (Symbol->Name.ShortName[COFF::NameSize - 1] == 0)
// Null terminated, let ::strlen figure out the length.
Res = StringRef(Symbol.getShortName());
Res = StringRef(Symbol->Name.ShortName);
else
// Not null terminated, use all 8 bytes.
Res = StringRef(Symbol.getShortName(), COFF::NameSize);
Res = StringRef(Symbol->Name.ShortName, COFF::NameSize);
return std::error_code();
}