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Rui Ueyama e5416ec2d2 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
 		2013-09-12 19:14:05 +00:00
..
cmake/modules Add VTune as an optional external dependency and add task tracking. 2013-04-06 00:56:40 +00:00
docs Update documentation. 2013-09-07 18:01:39 +00:00
include/lld Add a fallback mechanism for undefined atom. 2013-09-12 19:14:05 +00:00
lib Add a fallback mechanism for undefined atom. 2013-09-12 19:14:05 +00:00
test Add a fallback mechanism for undefined atom. 2013-09-12 19:14:05 +00:00
tools [lld]remove lld-core 2013-05-06 20:24:39 +00:00
unittests Remove hard-coded leading underscore from entry symbol. 2013-09-12 05:09:01 +00:00
utils Add basic linker script parsing. 2013-03-01 00:03:36 +00:00
.arcconfig Add .arcconfig for Phabricator command-line support 2013-01-03 02:15:37 +00:00
.gitignore docs: Sketch Sphinx based docs structure. 2012-04-06 21:02:20 +00:00
CMakeLists.txt CMake: Support the LLVM_INSTALL_TOOLCHAIN_ONLY flag 2013-08-24 00:24:15 +00:00
LICENSE.TXT Update the copyright coredits -- Happy new year 2013! 2013-01-01 10:00:19 +00:00
README.md Test commit 2012-09-14 00:00:39 +00:00

README.md

LLVM Linker (lld)

This directory and its subdirectories contain source code for the LLVM Linker, a modular cross platform linker which is built as part of the LLVM compiler infrastructure project.

lld is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.