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//===- MergingTypeTableBuilder.cpp ----------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/CodeView/MergingTypeTableBuilder.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/DebugInfo/CodeView/CodeView.h"
#include "llvm/DebugInfo/CodeView/ContinuationRecordBuilder.h"
#include "llvm/DebugInfo/CodeView/RecordSerialization.h"
#include "llvm/DebugInfo/CodeView/TypeIndex.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/BinaryByteStream.h"
#include "llvm/Support/BinaryStreamWriter.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/Error.h"
#include <algorithm>
#include <cassert>
#include <cstdint>
#include <cstring>
using namespace llvm;
using namespace llvm::codeview;
TypeIndex MergingTypeTableBuilder::nextTypeIndex() const {
return TypeIndex::fromArrayIndex(SeenRecords.size());
}
MergingTypeTableBuilder::MergingTypeTableBuilder(BumpPtrAllocator &Storage)
: RecordStorage(Storage) {
SeenRecords.reserve(4096);
}
MergingTypeTableBuilder::~MergingTypeTableBuilder() = default;
Optional<TypeIndex> MergingTypeTableBuilder::getFirst() {
if (empty())
return None;
return TypeIndex(TypeIndex::FirstNonSimpleIndex);
}
Optional<TypeIndex> MergingTypeTableBuilder::getNext(TypeIndex Prev) {
if (++Prev == nextTypeIndex())
return None;
return Prev;
}
CVType MergingTypeTableBuilder::getType(TypeIndex Index) {
CVType Type(SeenRecords[Index.toArrayIndex()]);
return Type;
}
StringRef MergingTypeTableBuilder::getTypeName(TypeIndex Index) {
llvm_unreachable("Method not implemented");
}
bool MergingTypeTableBuilder::contains(TypeIndex Index) {
if (Index.isSimple() || Index.isNoneType())
return false;
return Index.toArrayIndex() < SeenRecords.size();
}
uint32_t MergingTypeTableBuilder::size() { return SeenRecords.size(); }
uint32_t MergingTypeTableBuilder::capacity() { return SeenRecords.size(); }
ArrayRef<ArrayRef<uint8_t>> MergingTypeTableBuilder::records() const {
return SeenRecords;
}
void MergingTypeTableBuilder::reset() {
HashedRecords.clear();
SeenRecords.clear();
}
static inline ArrayRef<uint8_t> stabilize(BumpPtrAllocator &Alloc,
ArrayRef<uint8_t> Data) {
uint8_t *Stable = Alloc.Allocate<uint8_t>(Data.size());
memcpy(Stable, Data.data(), Data.size());
return makeArrayRef(Stable, Data.size());
}
TypeIndex MergingTypeTableBuilder::insertRecordAs(hash_code Hash,
ArrayRef<uint8_t> &Record) {
assert(Record.size() < UINT32_MAX && "Record too big");
assert(Record.size() % 4 == 0 &&
"The type record size is not a multiple of 4 bytes which will cause "
"misalignment in the output TPI stream!");
LocallyHashedType WeakHash{Hash, Record};
auto Result = HashedRecords.try_emplace(WeakHash, nextTypeIndex());
if (Result.second) {
ArrayRef<uint8_t> RecordData = stabilize(RecordStorage, Record);
Result.first->first.RecordData = RecordData;
SeenRecords.push_back(RecordData);
}
// Update the caller's copy of Record to point a stable copy.
TypeIndex ActualTI = Result.first->second;
Record = SeenRecords[ActualTI.toArrayIndex()];
return ActualTI;
}
TypeIndex
MergingTypeTableBuilder::insertRecordBytes(ArrayRef<uint8_t> &Record) {
return insertRecordAs(hash_value(Record), Record);
}
TypeIndex
MergingTypeTableBuilder::insertRecord(ContinuationRecordBuilder &Builder) {
TypeIndex TI;
auto Fragments = Builder.end(nextTypeIndex());
assert(!Fragments.empty());
for (auto C : Fragments)
TI = insertRecordBytes(C.RecordData);
return TI;
}
bool MergingTypeTableBuilder::replaceType(TypeIndex &Index, CVType Data,
bool Stabilize) {
assert(Index.toArrayIndex() < SeenRecords.size() &&
"This function cannot be used to insert records!");
ArrayRef<uint8_t> Record = Data.data();
assert(Record.size() < UINT32_MAX && "Record too big");
assert(Record.size() % 4 == 0 &&
"The type record size is not a multiple of 4 bytes which will cause "
"misalignment in the output TPI stream!");
LocallyHashedType WeakHash{hash_value(Record), Record};
auto Result = HashedRecords.try_emplace(WeakHash, Index.toArrayIndex());
if (!Result.second) {
Index = Result.first->second;
return false; // The record is already there, at a different location
}
if (Stabilize) {
Record = stabilize(RecordStorage, Record);
Result.first->first.RecordData = Record;
}
SeenRecords[Index.toArrayIndex()] = Record;
return true;
}
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