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| author | Rui Ueyama <ruiu@google.com> | 2013-09-12 19:14:05 +0000 |
|---|---|---|
| committer | Rui Ueyama <ruiu@google.com> | 2013-09-12 19:14:05 +0000 |
| commit | e5416ec2d21854f34801c33ef567072d3e647f6f (patch) | |
| tree | f216f2c3028f202636221ce64abf9cf5a3dbfeb3 /llvm/lib/Bitcode/Reader/BitcodeReader.cpp | |
| parent | 1e2e3ea584121f523aa4118f383927ed6b73246c (diff) | |
| download | llvm-e5416ec2d21854f34801c33ef567072d3e647f6f.zip llvm-e5416ec2d21854f34801c33ef567072d3e647f6f.tar.gz llvm-e5416ec2d21854f34801c33ef567072d3e647f6f.tar.bz2 | |
Add a fallback mechanism for undefined atom.
In COFF, an undefined symbol can have up to one alternative name. If a symbol
is resolved by its regular name, then it's linked normally. If a symbol is not
found in any input files, all references to the regular name are resolved using
the alternative name. If the alternative name is not found, it's a link error.
This mechanism is called "weak externals".
To support this mechanism, I added a new member function fallback() to undefined
atom. If an undefined atom has the second name, fallback() returns a new undefined
atom that should be used instead of the original one to resolve undefines. If it
does not have the second name, the function returns nullptr.
Differential Revision: http://llvm-reviews.chandlerc.com/D1550
llvm-svn: 190625
Diffstat (limited to 'llvm/lib/Bitcode/Reader/BitcodeReader.cpp')
0 files changed, 0 insertions, 0 deletions