| 1 | //===- TypeReferenceTracker.h --------------------------------- *- C++ --*-===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef LLVM_TOOLS_LLVMPDBDUMP_TYPEREFERENCETRACKER_H |
| 10 | #define LLVM_TOOLS_LLVMPDBDUMP_TYPEREFERENCETRACKER_H |
| 11 | |
| 12 | #include "llvm/ADT/BitVector.h" |
| 13 | #include "llvm/ADT/SmallVector.h" |
| 14 | #include "llvm/DebugInfo/CodeView/CVRecord.h" |
| 15 | #include "llvm/DebugInfo/CodeView/TypeIndex.h" |
| 16 | #include "llvm/DebugInfo/CodeView/TypeIndexDiscovery.h" |
| 17 | #include "llvm/DebugInfo/PDB/Native/InputFile.h" |
| 18 | #include "llvm/Support/Error.h" |
| 19 | |
| 20 | namespace llvm { |
| 21 | namespace pdb { |
| 22 | |
| 23 | class TpiStream; |
| 24 | |
| 25 | /// Maintains bitvector to track whether a type was referenced by a symbol |
| 26 | /// record. |
| 27 | class TypeReferenceTracker { |
| 28 | public: |
| 29 | TypeReferenceTracker(InputFile &File); |
| 30 | |
| 31 | // Do the work of marking referenced types. |
| 32 | void mark(); |
| 33 | |
| 34 | // Return true if a symbol record transitively references this type. |
| 35 | bool isTypeReferenced(codeview::TypeIndex TI) { |
| 36 | return TI.toArrayIndex() <= NumTypeRecords && |
| 37 | TypeReferenced.test(Idx: TI.toArrayIndex()); |
| 38 | } |
| 39 | |
| 40 | private: |
| 41 | void addTypeRefsFromSymbol(const codeview::CVSymbol &Sym); |
| 42 | |
| 43 | // Mark types on this list as referenced. |
| 44 | void addReferencedTypes(ArrayRef<uint8_t> RecData, |
| 45 | ArrayRef<codeview::TiReference> Refs); |
| 46 | |
| 47 | // Consume all types on the worklist. |
| 48 | void markReferencedTypes(); |
| 49 | |
| 50 | void addOneTypeRef(codeview::TiRefKind RefKind, codeview::TypeIndex RefTI); |
| 51 | |
| 52 | InputFile &File; |
| 53 | codeview::LazyRandomTypeCollection &Types; |
| 54 | codeview::LazyRandomTypeCollection *Ids = nullptr; |
| 55 | TpiStream *Tpi = nullptr; |
| 56 | BitVector TypeReferenced; |
| 57 | BitVector IdReferenced; |
| 58 | SmallVector<std::pair<codeview::TiRefKind, codeview::TypeIndex>, 10> |
| 59 | RefWorklist; |
| 60 | uint32_t NumTypeRecords = 0; |
| 61 | uint32_t NumIdRecords = 0; |
| 62 | }; |
| 63 | |
| 64 | } // namespace pdb |
| 65 | } // namespace llvm |
| 66 | |
| 67 | #endif // LLVM_TOOLS_LLVMPDBDUMP_TYPEREFERENCETRACKER_H |
| 68 |