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//===- GlobalTypeTableBuilder.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/GlobalTypeTableBuilder.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/None.h"
#include "llvm/DebugInfo/CodeView/CodeView.h"
#include "llvm/DebugInfo/CodeView/ContinuationRecordBuilder.h"
#include "llvm/DebugInfo/CodeView/TypeIndex.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/ErrorHandling.h"
#include <cassert>
#include <cstdint>
#include <cstring>
using namespace llvm;
using namespace llvm::codeview;
TypeIndex GlobalTypeTableBuilder::nextTypeIndex() const {
return TypeIndex::fromArrayIndex(SeenRecords.size());
}
GlobalTypeTableBuilder::GlobalTypeTableBuilder(BumpPtrAllocator &Storage)
: RecordStorage(Storage) {
SeenRecords.reserve(4096);
}
GlobalTypeTableBuilder::~GlobalTypeTableBuilder() = default;
Optional<TypeIndex> GlobalTypeTableBuilder::getFirst() {
if (empty())
return None;
return TypeIndex(TypeIndex::FirstNonSimpleIndex);
}
Optional<TypeIndex> GlobalTypeTableBuilder::getNext(TypeIndex Prev) {
if (++Prev == nextTypeIndex())
return None;
return Prev;
}
CVType GlobalTypeTableBuilder::getType(TypeIndex Index) {
CVType Type(SeenRecords[Index.toArrayIndex()]);
return Type;
}
StringRef GlobalTypeTableBuilder::getTypeName(TypeIndex Index) {
llvm_unreachable("Method not implemented");
}
bool GlobalTypeTableBuilder::contains(TypeIndex Index) {
if (Index.isSimple() || Index.isNoneType())
return false;
return Index.toArrayIndex() < SeenRecords.size();
}
uint32_t GlobalTypeTableBuilder::size() { return SeenRecords.size(); }
uint32_t GlobalTypeTableBuilder::capacity() { return SeenRecords.size(); }
ArrayRef<ArrayRef<uint8_t>> GlobalTypeTableBuilder::records() const {
return SeenRecords;
}
ArrayRef<GloballyHashedType> GlobalTypeTableBuilder::hashes() const {
return SeenHashes;
}
void GlobalTypeTableBuilder::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 GlobalTypeTableBuilder::insertRecordBytes(ArrayRef<uint8_t> Record) {
GloballyHashedType GHT =
GloballyHashedType::hashType(Record, SeenHashes, SeenHashes);
return insertRecordAs(GHT, Record.size(),
[Record](MutableArrayRef<uint8_t> Data) {
assert(Data.size() == Record.size());
::memcpy(Data.data(), Record.data(), Record.size());
return Data;
});
}
TypeIndex
GlobalTypeTableBuilder::insertRecord(ContinuationRecordBuilder &Builder) {
TypeIndex TI;
auto Fragments = Builder.end(nextTypeIndex());
assert(!Fragments.empty());
for (auto C : Fragments)
TI = insertRecordBytes(C.RecordData);
return TI;
}
bool GlobalTypeTableBuilder::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!");
GloballyHashedType Hash =
GloballyHashedType::hashType(Record, SeenHashes, SeenHashes);
auto Result = HashedRecords.try_emplace(Hash, 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);
SeenRecords[Index.toArrayIndex()] = Record;
SeenHashes[Index.toArrayIndex()] = Hash;
return true;
}
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