1 //===- MergingTypeTableBuilder.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_DEBUGINFO_CODEVIEW_MERGINGTYPETABLEBUILDER_H 10 #define LLVM_DEBUGINFO_CODEVIEW_MERGINGTYPETABLEBUILDER_H 11 12 #include "llvm/ADT/ArrayRef.h" 13 #include "llvm/ADT/DenseSet.h" 14 #include "llvm/ADT/SmallVector.h" 15 #include "llvm/DebugInfo/CodeView/CodeView.h" 16 #include "llvm/DebugInfo/CodeView/SimpleTypeSerializer.h" 17 #include "llvm/DebugInfo/CodeView/TypeCollection.h" 18 #include "llvm/DebugInfo/CodeView/TypeHashing.h" 19 #include "llvm/DebugInfo/CodeView/TypeIndex.h" 20 #include "llvm/Support/Allocator.h" 21 #include <cassert> 22 #include <cstdint> 23 #include <memory> 24 #include <vector> 25 26 namespace llvm { 27 namespace codeview { 28 29 class ContinuationRecordBuilder; 30 31 class MergingTypeTableBuilder : public TypeCollection { 32 /// Storage for records. These need to outlive the TypeTableBuilder. 33 BumpPtrAllocator &RecordStorage; 34 35 /// A serializer that can write non-continuation leaf types. Only used as 36 /// a convenience function so that we can provide an interface method to 37 /// write an unserialized record. 38 SimpleTypeSerializer SimpleSerializer; 39 40 /// Hash table. 41 DenseMap<LocallyHashedType, TypeIndex> HashedRecords; 42 43 /// Contains a list of all records indexed by TypeIndex.toArrayIndex(). 44 SmallVector<ArrayRef<uint8_t>, 2> SeenRecords; 45 46 public: 47 explicit MergingTypeTableBuilder(BumpPtrAllocator &Storage); 48 ~MergingTypeTableBuilder(); 49 50 // TypeCollection overrides 51 Optional<TypeIndex> getFirst() override; 52 Optional<TypeIndex> getNext(TypeIndex Prev) override; 53 CVType getType(TypeIndex Index) override; 54 StringRef getTypeName(TypeIndex Index) override; 55 bool contains(TypeIndex Index) override; 56 uint32_t size() override; 57 uint32_t capacity() override; 58 bool replaceType(TypeIndex &Index, CVType Data, bool Stabilize) override; 59 60 // public interface 61 void reset(); 62 TypeIndex nextTypeIndex() const; 63 getAllocator()64 BumpPtrAllocator &getAllocator() { return RecordStorage; } 65 66 ArrayRef<ArrayRef<uint8_t>> records() const; 67 68 TypeIndex insertRecordAs(hash_code Hash, ArrayRef<uint8_t> &Record); 69 TypeIndex insertRecordBytes(ArrayRef<uint8_t> &Record); 70 TypeIndex insertRecord(ContinuationRecordBuilder &Builder); 71 writeLeafType(T & Record)72 template <typename T> TypeIndex writeLeafType(T &Record) { 73 ArrayRef<uint8_t> Data = SimpleSerializer.serialize(Record); 74 return insertRecordBytes(Data); 75 } 76 }; 77 78 } // end namespace codeview 79 } // end namespace llvm 80 81 #endif // LLVM_DEBUGINFO_CODEVIEW_MERGINGTYPETABLEBUILDER_H 82