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/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
  23 TypeIndex AppendingTypeTableBuilder::nextTypeIndex() const {
  24   return TypeIndex::fromArrayIndex(SeenRecords.size());
  25 }
  26
  27 AppendingTypeTableBuilder::AppendingTypeTableBuilder(BumpPtrAllocator &Storage)
  28     : RecordStorage(Storage) {}
  29
  30 AppendingTypeTableBuilder::~AppendingTypeTableBuilder() = default;
  31
  32 std::optional<TypeIndex> AppendingTypeTableBuilder::getFirst() {
  33   if (empty())
  34     return std::nullopt;
  35
  36   return TypeIndex(TypeIndex::FirstNonSimpleIndex);
  37 }
  38
  39 std::optional<TypeIndex> AppendingTypeTableBuilder::getNext(TypeIndex Prev) {
  40   if (++Prev == nextTypeIndex())
  41     return std::nullopt;
  42   return Prev;
  43 }
  44
  45 CVType AppendingTypeTableBuilder::getType(TypeIndex Index){
  46   return CVType(SeenRecords[Index.toArrayIndex()]);
  47 }
  48
  49 StringRef AppendingTypeTableBuilder::getTypeName(TypeIndex Index) {
  50   llvm_unreachable("Method not implemented");
  51 }
  52
  53 bool AppendingTypeTableBuilder::contains(TypeIndex Index) {
  54   if (Index.isSimple() || Index.isNoneType())
  55     return false;
  56
  57   return Index.toArrayIndex() < SeenRecords.size();
  58 }
  59
  60 uint32_t AppendingTypeTableBuilder::size() { return SeenRecords.size(); }
  61
  62 uint32_t AppendingTypeTableBuilder::capacity() { return SeenRecords.size(); }
  63
  64 ArrayRef<ArrayRef<uint8_t>> AppendingTypeTableBuilder::records() const {
  65   return SeenRecords;
  66 }
  67
  68 void AppendingTypeTableBuilder::reset() { SeenRecords.clear(); }
  69
  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
  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
  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
  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 }