Duncan Sands 667d4b8de6 Introduce new linkage types linkonce_odr, weak_odr, common_odr ... and extern_weak_odr. These are the same as the non-odr versions, except that they indicate that the global will only be overridden by an *equivalent* global. In C, a function with weak linkage can be overridden by a function which behaves completely differently. This means that IP passes have to skip weak functions, since any deductions made from the function definition might be wrong, since the definition could be replaced by something completely different at link time. This is not allowed in C++, thanks to the ODR (One-Definition-Rule): if a function is replaced by another at link-time, then the new function must be the same as the original function. If a language knows that a function or other global can only be overridden by an equivalent global, it can give it the weak_odr linkage type, and the optimizers will understand that it is alright to make deductions based on the function body. The code generators on the other hand map weak and weak_odr linkage to the same thing. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66339 91177308-0d34-0410-b5e6-96231b3b80d8		2009-03-07 15:45:40 +00:00
..
CallingConvLower.cpp
CMakeLists.txt
DAGCombiner.cpp
FastISel.cpp
LegalizeDAG.cpp
LegalizeFloatTypes.cpp
LegalizeIntegerTypes.cpp	PR3686: make the legalizer handle bitcast from i80 to x86 long double.	2009-03-04 06:23:34 +00:00
LegalizeTypes.cpp	Use getDebugLoc forwarder instead of getNode()->getDebugLoc.	2009-02-07 19:59:05 +00:00
LegalizeTypes.h	PR3686: make the legalizer handle bitcast from i80 to x86 long double.	2009-03-04 06:23:34 +00:00
LegalizeTypesGeneric.cpp
LegalizeVectorTypes.cpp
Makefile
ScheduleDAGFast.cpp
ScheduleDAGList.cpp
ScheduleDAGRRList.cpp	Fix ScheduleDAGRRList::CopyAndMoveSuccessors' handling of nodes	2009-03-06 02:23:01 +00:00
ScheduleDAGSDNodes.cpp
ScheduleDAGSDNodes.h
ScheduleDAGSDNodesEmit.cpp
SelectionDAG.cpp	Fix BuildVectorSDNode::isConstantSplat to handle one-element vectors.	2009-03-04 17:47:01 +00:00
SelectionDAGBuild.cpp
SelectionDAGBuild.h
SelectionDAGISel.cpp
SelectionDAGPrinter.cpp
TargetLowering.cpp	Introduce new linkage types linkonce_odr, weak_odr, common_odr	2009-03-07 15:45:40 +00:00