1 //===- AppendingTypeTableBuilder.cpp --------------------------------------===//
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 #include "llvm/DebugInfo/CodeView/AppendingTypeTableBuilder.h"
10 #include "llvm/ADT/ArrayRef.h"
11 #include "llvm/DebugInfo/CodeView/CodeView.h"
12 #include "llvm/DebugInfo/CodeView/ContinuationRecordBuilder.h"
13 #include "llvm/DebugInfo/CodeView/TypeIndex.h"
14 #include "llvm/Support/Allocator.h"
15 #include "llvm/Support/ErrorHandling.h"
16 #include <cassert>
17 #include <cstdint>
18 #include <cstring>
19
20 using namespace llvm;
21 using namespace llvm::codeview;
22
nextTypeIndex() const23 TypeIndex AppendingTypeTableBuilder::nextTypeIndex() const {
24 return TypeIndex::fromArrayIndex(SeenRecords.size());
25 }
26
AppendingTypeTableBuilder(BumpPtrAllocator & Storage)27 AppendingTypeTableBuilder::AppendingTypeTableBuilder(BumpPtrAllocator &Storage)
28 : RecordStorage(Storage) {}
29
30 AppendingTypeTableBuilder::~AppendingTypeTableBuilder() = default;
31
getFirst()32 std::optional<TypeIndex> AppendingTypeTableBuilder::getFirst() {
33 if (empty())
34 return std::nullopt;
35
36 return TypeIndex(TypeIndex::FirstNonSimpleIndex);
37 }
38
getNext(TypeIndex Prev)39 std::optional<TypeIndex> AppendingTypeTableBuilder::getNext(TypeIndex Prev) {
40 if (++Prev == nextTypeIndex())
41 return std::nullopt;
42 return Prev;
43 }
44
getType(TypeIndex Index)45 CVType AppendingTypeTableBuilder::getType(TypeIndex Index){
46 return CVType(SeenRecords[Index.toArrayIndex()]);
47 }
48
getTypeName(TypeIndex Index)49 StringRef AppendingTypeTableBuilder::getTypeName(TypeIndex Index) {
50 llvm_unreachable("Method not implemented");
51 }
52
contains(TypeIndex Index)53 bool AppendingTypeTableBuilder::contains(TypeIndex Index) {
54 if (Index.isSimple() || Index.isNoneType())
55 return false;
56
57 return Index.toArrayIndex() < SeenRecords.size();
58 }
59
size()60 uint32_t AppendingTypeTableBuilder::size() { return SeenRecords.size(); }
61
capacity()62 uint32_t AppendingTypeTableBuilder::capacity() { return SeenRecords.size(); }
63
records() const64 ArrayRef<ArrayRef<uint8_t>> AppendingTypeTableBuilder::records() const {
65 return SeenRecords;
66 }
67
reset()68 void AppendingTypeTableBuilder::reset() { SeenRecords.clear(); }
69
stabilize(BumpPtrAllocator & RecordStorage,ArrayRef<uint8_t> Record)70 static ArrayRef<uint8_t> stabilize(BumpPtrAllocator &RecordStorage,
71 ArrayRef<uint8_t> Record) {
72 uint8_t *Stable = RecordStorage.Allocate<uint8_t>(Record.size());
73 memcpy(Stable, Record.data(), Record.size());
74 return ArrayRef<uint8_t>(Stable, Record.size());
75 }
76
77 TypeIndex
insertRecordBytes(ArrayRef<uint8_t> & Record)78 AppendingTypeTableBuilder::insertRecordBytes(ArrayRef<uint8_t> &Record) {
79 TypeIndex NewTI = nextTypeIndex();
80 Record = stabilize(RecordStorage, Record);
81 SeenRecords.push_back(Record);
82 return NewTI;
83 }
84
85 TypeIndex
insertRecord(ContinuationRecordBuilder & Builder)86 AppendingTypeTableBuilder::insertRecord(ContinuationRecordBuilder &Builder) {
87 TypeIndex TI;
88 auto Fragments = Builder.end(nextTypeIndex());
89 assert(!Fragments.empty());
90 for (auto C : Fragments)
91 TI = insertRecordBytes(C.RecordData);
92 return TI;
93 }
94
replaceType(TypeIndex & Index,CVType Data,bool Stabilize)95 bool AppendingTypeTableBuilder::replaceType(TypeIndex &Index, CVType Data,
96 bool Stabilize) {
97 assert(Index.toArrayIndex() < SeenRecords.size() &&
98 "This function cannot be used to insert records!");
99
100 ArrayRef<uint8_t> Record = Data.data();
101 if (Stabilize)
102 Record = stabilize(RecordStorage, Record);
103 SeenRecords[Index.toArrayIndex()] = Record;
104 return true;
105 }
106