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/ADT/DenseSet.h"
  12 #include "llvm/ADT/STLExtras.h"
  13 #include "llvm/DebugInfo/CodeView/CodeView.h"
  14 #include "llvm/DebugInfo/CodeView/ContinuationRecordBuilder.h"
  15 #include "llvm/DebugInfo/CodeView/RecordSerialization.h"
  16 #include "llvm/DebugInfo/CodeView/TypeIndex.h"
  17 #include "llvm/Support/Allocator.h"
  18 #include "llvm/Support/BinaryByteStream.h"
  19 #include "llvm/Support/BinaryStreamWriter.h"
  20 #include "llvm/Support/Endian.h"
  21 #include "llvm/Support/Error.h"
  22 #include <algorithm>
  23 #include <cassert>
  24 #include <cstdint>
  25 #include <cstring>
  26
  27 using namespace llvm;
  28 using namespace llvm::codeview;
  29
  30 TypeIndex AppendingTypeTableBuilder::nextTypeIndex() const {
  31   return TypeIndex::fromArrayIndex(SeenRecords.size());
  32 }
  33
  34 AppendingTypeTableBuilder::AppendingTypeTableBuilder(BumpPtrAllocator &Storage)
  35     : RecordStorage(Storage) {}
  36
  37 AppendingTypeTableBuilder::~AppendingTypeTableBuilder() = default;
  38
  39 Optional<TypeIndex> AppendingTypeTableBuilder::getFirst() {
  40   if (empty())
  41     return None;
  42
  43   return TypeIndex(TypeIndex::FirstNonSimpleIndex);
  44 }
  45
  46 Optional<TypeIndex> AppendingTypeTableBuilder::getNext(TypeIndex Prev) {
  47   if (++Prev == nextTypeIndex())
  48     return None;
  49   return Prev;
  50 }
  51
  52 CVType AppendingTypeTableBuilder::getType(TypeIndex Index){
  53   return CVType(SeenRecords[Index.toArrayIndex()]);
  54 }
  55
  56 StringRef AppendingTypeTableBuilder::getTypeName(TypeIndex Index) {
  57   llvm_unreachable("Method not implemented");
  58 }
  59
  60 bool AppendingTypeTableBuilder::contains(TypeIndex Index) {
  61   if (Index.isSimple() || Index.isNoneType())
  62     return false;
  63
  64   return Index.toArrayIndex() < SeenRecords.size();
  65 }
  66
  67 uint32_t AppendingTypeTableBuilder::size() { return SeenRecords.size(); }
  68
  69 uint32_t AppendingTypeTableBuilder::capacity() { return SeenRecords.size(); }
  70
  71 ArrayRef<ArrayRef<uint8_t>> AppendingTypeTableBuilder::records() const {
  72   return SeenRecords;
  73 }
  74
  75 void AppendingTypeTableBuilder::reset() { SeenRecords.clear(); }
  76
  77 static ArrayRef<uint8_t> stabilize(BumpPtrAllocator &RecordStorage,
  78                                    ArrayRef<uint8_t> Record) {
  79   uint8_t *Stable = RecordStorage.Allocate<uint8_t>(Record.size());
  80   memcpy(Stable, Record.data(), Record.size());
  81   return ArrayRef<uint8_t>(Stable, Record.size());
  82 }
  83
  84 TypeIndex
  85 AppendingTypeTableBuilder::insertRecordBytes(ArrayRef<uint8_t> &Record) {
  86   TypeIndex NewTI = nextTypeIndex();
  87   Record = stabilize(RecordStorage, Record);
  88   SeenRecords.push_back(Record);
  89   return NewTI;
  90 }
  91
  92 TypeIndex
  93 AppendingTypeTableBuilder::insertRecord(ContinuationRecordBuilder &Builder) {
  94   TypeIndex TI;
  95   auto Fragments = Builder.end(nextTypeIndex());
  96   assert(!Fragments.empty());
  97   for (auto C : Fragments)
  98     TI = insertRecordBytes(C.RecordData);
  99   return TI;
 100 }
 101
 102 bool AppendingTypeTableBuilder::replaceType(TypeIndex &Index, CVType Data,
 103                                             bool Stabilize) {
 104   assert(Index.toArrayIndex() < SeenRecords.size() &&
 105          "This function cannot be used to insert records!");
 106
 107   ArrayRef<uint8_t> Record = Data.data();
 108   if (Stabilize)
 109     Record = stabilize(RecordStorage, Record);
 110   SeenRecords[Index.toArrayIndex()] = Record;
 111   return true;
 112 }