llvm-6502/unittests/Transforms/IPO/CMakeLists.txt

set(LLVM_LINK_COMPONENTS
  Core
  Support
  IPO
  )

add_llvm_unittest(IPOTests
  LowerBitSets.cpp
  )
Introduce bitset metadata format and bitset lowering pass. This patch introduces a new mechanism that allows IR modules to co-operatively build pointer sets corresponding to addresses within a given set of globals. One particular use case for this is to allow a C++ program to efficiently verify (at each call site) that a vtable pointer is in the set of valid vtable pointers for the class or its derived classes. One way of doing this is for a toolchain component to build, for each class, a bit set that maps to the memory region allocated for the vtables, such that each 1 bit in the bit set maps to a valid vtable for that class, and lay out the vtables next to each other, to minimize the total size of the bit sets. The patch introduces a metadata format for representing pointer sets, an '@llvm.bitset.test' intrinsic and an LTO lowering pass that lays out the globals and builds the bitsets, and documents the new feature. Differential Revision: http://reviews.llvm.org/D7288 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230054 91177308-0d34-0410-b5e6-96231b3b80d8 2015-02-20 20:30:47 +00:00			`set(LLVM_LINK_COMPONENTS`
			`Core`
			`Support`
			`IPO`
			`)`

			`add_llvm_unittest(IPOTests`
			`LowerBitSets.cpp`
			`)`