llvm/lib/DebugInfo/CodeView/AppendingTypeTableBuilder.cpp

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