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//===- CodeViewRecordIO.h ---------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_DEBUGINFO_CODEVIEW_CODEVIEWRECORDIO_H
#define LLVM_DEBUGINFO_CODEVIEW_CODEVIEWRECORDIO_H
#include "llvm/ADT/APSInt.h"
#include "llvm/ADT/None.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/DebugInfo/CodeView/CodeViewError.h"
#include "llvm/DebugInfo/CodeView/TypeRecord.h"
#include "llvm/Support/BinaryStreamReader.h"
#include "llvm/Support/BinaryStreamWriter.h"
#include "llvm/Support/Error.h"
#include <cassert>
#include <cstdint>
#include <type_traits>
namespace llvm {
namespace codeview {
class CodeViewRecordIO {
uint32_t getCurrentOffset() const {
return (isWriting()) ? Writer->getOffset() : Reader->getOffset();
}
public:
explicit CodeViewRecordIO(BinaryStreamReader &Reader) : Reader(&Reader) {}
explicit CodeViewRecordIO(BinaryStreamWriter &Writer) : Writer(&Writer) {}
Error beginRecord(Optional<uint32_t> MaxLength);
Error endRecord();
Error mapInteger(TypeIndex &TypeInd);
bool isReading() const { return Reader != nullptr; }
bool isWriting() const { return !isReading(); }
uint32_t maxFieldLength() const;
template <typename T> Error mapObject(T &Value) {
if (isWriting())
return Writer->writeObject(Value);
const T *ValuePtr;
if (auto EC = Reader->readObject(ValuePtr))
return EC;
Value = *ValuePtr;
return Error::success();
}
template <typename T> Error mapInteger(T &Value) {
if (isWriting())
return Writer->writeInteger(Value);
return Reader->readInteger(Value);
}
template <typename T> Error mapEnum(T &Value) {
if (sizeof(Value) > maxFieldLength())
return make_error<CodeViewError>(cv_error_code::insufficient_buffer);
using U = typename std::underlying_type<T>::type;
U X;
if (isWriting())
X = static_cast<U>(Value);
if (auto EC = mapInteger(X))
return EC;
if (isReading())
Value = static_cast<T>(X);
return Error::success();
}
Error mapEncodedInteger(int64_t &Value);
Error mapEncodedInteger(uint64_t &Value);
Error mapEncodedInteger(APSInt &Value);
Error mapStringZ(StringRef &Value);
Error mapGuid(GUID &Guid);
Error mapStringZVectorZ(std::vector<StringRef> &Value);
template <typename SizeType, typename T, typename ElementMapper>
Error mapVectorN(T &Items, const ElementMapper &Mapper) {
SizeType Size;
if (isWriting()) {
Size = static_cast<SizeType>(Items.size());
if (auto EC = Writer->writeInteger(Size))
return EC;
for (auto &X : Items) {
if (auto EC = Mapper(*this, X))
return EC;
}
} else {
if (auto EC = Reader->readInteger(Size))
return EC;
for (SizeType I = 0; I < Size; ++I) {
typename T::value_type Item;
if (auto EC = Mapper(*this, Item))
return EC;
Items.push_back(Item);
}
}
return Error::success();
}
template <typename T, typename ElementMapper>
Error mapVectorTail(T &Items, const ElementMapper &Mapper) {
if (isWriting()) {
for (auto &Item : Items) {
if (auto EC = Mapper(*this, Item))
return EC;
}
} else {
typename T::value_type Field;
// Stop when we run out of bytes or we hit record padding bytes.
while (!Reader->empty() && Reader->peek() < 0xf0 /* LF_PAD0 */) {
if (auto EC = Mapper(*this, Field))
return EC;
Items.push_back(Field);
}
}
return Error::success();
}
Error mapByteVectorTail(ArrayRef<uint8_t> &Bytes);
Error mapByteVectorTail(std::vector<uint8_t> &Bytes);
Error padToAlignment(uint32_t Align);
Error skipPadding();
private:
Error writeEncodedSignedInteger(const int64_t &Value);
Error writeEncodedUnsignedInteger(const uint64_t &Value);
struct RecordLimit {
uint32_t BeginOffset;
Optional<uint32_t> MaxLength;
Optional<uint32_t> bytesRemaining(uint32_t CurrentOffset) const {
if (!MaxLength.hasValue())
return None;
assert(CurrentOffset >= BeginOffset);
uint32_t BytesUsed = CurrentOffset - BeginOffset;
if (BytesUsed >= *MaxLength)
return 0;
return *MaxLength - BytesUsed;
}
};
SmallVector<RecordLimit, 2> Limits;
BinaryStreamReader *Reader = nullptr;
BinaryStreamWriter *Writer = nullptr;
};
} // end namespace codeview
} // end namespace llvm
#endif // LLVM_DEBUGINFO_CODEVIEW_CODEVIEWRECORDIO_H
|
