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Context:
--------
There are places in LLVM where we need to pack typed fields into opaque values.
For instance, the `XXXInst` classes in `llvm/include/llvm/IR/Instructions.h` that extract informations from `Value::SubclassData` via `getSubclassDataFromInstruction()`.
The bit twiddling is done manually: this impairs readability and prevent consistent handling of out of range values (e.g. 435b458ad0/llvm/include/llvm/IR/Instructions.h (L564))
More importantly, the bit pattern is scattered throughout the implementation making it hard to pack additionnal fields or check for overlapping bits.
Design decisions:
-----------------
The Bitfield structs are to be declared together so it is clear which bits are used or not.
The code is designed with simplicity in mind, hence a few limitations:
- Storage is limited to a single integer,
- Enum values have to be `unsigned`,
- Storage type has to be `unsigned`,
- There are no automatic detection of overlapping fields (packed bitfield declaration should help though),
- The interface is C like so `storage` needs to be passed in everytime (code is simpler and lifetime considerations more obvious)
RFC: http://lists.llvm.org/pipermail/llvm-dev/2020-June/142196.html
Differential Revision: https://reviews.llvm.org/D81580
85 lines
1.8 KiB
CMake
85 lines
1.8 KiB
CMake
set(LLVM_LINK_COMPONENTS
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Support
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)
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add_llvm_unittest(ADTTests
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AnyTest.cpp
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APFloatTest.cpp
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APIntTest.cpp
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APSIntTest.cpp
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ArrayRefTest.cpp
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BitFieldsTest.cpp
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BitmaskEnumTest.cpp
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BitVectorTest.cpp
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BreadthFirstIteratorTest.cpp
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BumpPtrListTest.cpp
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CoalescingBitVectorTest.cpp
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DAGDeltaAlgorithmTest.cpp
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DeltaAlgorithmTest.cpp
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DenseMapTest.cpp
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DenseSetTest.cpp
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DepthFirstIteratorTest.cpp
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DirectedGraphTest.cpp
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EnumeratedArrayTest.cpp
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EquivalenceClassesTest.cpp
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FallibleIteratorTest.cpp
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FloatingPointMode.cpp
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FoldingSet.cpp
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FunctionExtrasTest.cpp
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FunctionRefTest.cpp
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HashingTest.cpp
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IListBaseTest.cpp
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IListIteratorTest.cpp
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IListNodeBaseTest.cpp
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IListNodeTest.cpp
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IListSentinelTest.cpp
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IListTest.cpp
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ImmutableListTest.cpp
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ImmutableMapTest.cpp
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ImmutableSetTest.cpp
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IntEqClassesTest.cpp
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IntervalMapTest.cpp
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IntrusiveRefCntPtrTest.cpp
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IteratorTest.cpp
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MappedIteratorTest.cpp
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MapVectorTest.cpp
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OptionalTest.cpp
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PackedVectorTest.cpp
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PointerEmbeddedIntTest.cpp
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PointerIntPairTest.cpp
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PointerSumTypeTest.cpp
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PointerUnionTest.cpp
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PostOrderIteratorTest.cpp
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PriorityWorklistTest.cpp
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RangeAdapterTest.cpp
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SCCIteratorTest.cpp
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STLExtrasTest.cpp
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ScopeExitTest.cpp
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SequenceTest.cpp
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SetVectorTest.cpp
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SimpleIListTest.cpp
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SmallPtrSetTest.cpp
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SmallSetTest.cpp
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SmallStringTest.cpp
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SmallVectorTest.cpp
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SparseBitVectorTest.cpp
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SparseMultiSetTest.cpp
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SparseSetTest.cpp
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StatisticTest.cpp
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StringExtrasTest.cpp
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StringMapTest.cpp
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StringRefTest.cpp
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StringSetTest.cpp
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StringSwitchTest.cpp
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TinyPtrVectorTest.cpp
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TripleTest.cpp
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TwineTest.cpp
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TypeSwitchTest.cpp
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TypeTraitsTest.cpp
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WaymarkingTest.cpp
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)
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target_link_libraries(ADTTests PRIVATE LLVMTestingSupport)
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add_dependencies(ADTTests intrinsics_gen)
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