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| //===-- RecordSerialization.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
//
//===----------------------------------------------------------------------===//
//
// Utilities for serializing and deserializing CodeView records.
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/CodeView/RecordSerialization.h"
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/APSInt.h"
#include "llvm/DebugInfo/CodeView/CodeViewError.h"
#include "llvm/DebugInfo/CodeView/SymbolRecord.h"
#include "llvm/DebugInfo/CodeView/TypeRecord.h"
#include "llvm/Support/BinaryByteStream.h"
using namespace llvm;
using namespace llvm::codeview;
using namespace llvm::support;
/// Reinterpret a byte array as an array of characters. Does not interpret as
/// a C string, as StringRef has several helpers (split) that make that easy.
StringRef llvm::codeview::getBytesAsCharacters(ArrayRef<uint8_t> LeafData) {
return StringRef(reinterpret_cast<const char *>(LeafData.data()),
LeafData.size());
}
StringRef llvm::codeview::getBytesAsCString(ArrayRef<uint8_t> LeafData) {
return getBytesAsCharacters(LeafData).split('\0').first;
}
Error llvm::codeview::consume(BinaryStreamReader &Reader, APSInt &Num) {
// Used to avoid overload ambiguity on APInt construtor.
bool FalseVal = false;
uint16_t Short;
if (auto EC = Reader.readInteger(Short))
return EC;
if (Short < LF_NUMERIC) {
Num = APSInt(APInt(/*numBits=*/16, Short, /*isSigned=*/false),
/*isUnsigned=*/true);
return Error::success();
}
switch (Short) {
case LF_CHAR: {
int8_t N;
if (auto EC = Reader.readInteger(N))
return EC;
Num = APSInt(APInt(8, N, true), false);
return Error::success();
}
case LF_SHORT: {
int16_t N;
if (auto EC = Reader.readInteger(N))
return EC;
Num = APSInt(APInt(16, N, true), false);
return Error::success();
}
case LF_USHORT: {
uint16_t N;
if (auto EC = Reader.readInteger(N))
return EC;
Num = APSInt(APInt(16, N, false), true);
return Error::success();
}
case LF_LONG: {
int32_t N;
if (auto EC = Reader.readInteger(N))
return EC;
Num = APSInt(APInt(32, N, true), false);
return Error::success();
}
case LF_ULONG: {
uint32_t N;
if (auto EC = Reader.readInteger(N))
return EC;
Num = APSInt(APInt(32, N, FalseVal), true);
return Error::success();
}
case LF_QUADWORD: {
int64_t N;
if (auto EC = Reader.readInteger(N))
return EC;
Num = APSInt(APInt(64, N, true), false);
return Error::success();
}
case LF_UQUADWORD: {
uint64_t N;
if (auto EC = Reader.readInteger(N))
return EC;
Num = APSInt(APInt(64, N, false), true);
return Error::success();
}
}
return make_error<CodeViewError>(cv_error_code::corrupt_record,
"Buffer contains invalid APSInt type");
}
Error llvm::codeview::consume(StringRef &Data, APSInt &Num) {
ArrayRef<uint8_t> Bytes(Data.bytes_begin(), Data.bytes_end());
BinaryByteStream S(Bytes, llvm::support::little);
BinaryStreamReader SR(S);
auto EC = consume(SR, Num);
Data = Data.take_back(SR.bytesRemaining());
return EC;
}
/// Decode a numeric leaf value that is known to be a uint64_t.
Error llvm::codeview::consume_numeric(BinaryStreamReader &Reader,
uint64_t &Num) {
APSInt N;
if (auto EC = consume(Reader, N))
return EC;
if (N.isSigned() || !N.isIntN(64))
return make_error<CodeViewError>(cv_error_code::corrupt_record,
"Data is not a numeric value!");
Num = N.getLimitedValue();
return Error::success();
}
Error llvm::codeview::consume(BinaryStreamReader &Reader, uint32_t &Item) {
return Reader.readInteger(Item);
}
Error llvm::codeview::consume(StringRef &Data, uint32_t &Item) {
ArrayRef<uint8_t> Bytes(Data.bytes_begin(), Data.bytes_end());
BinaryByteStream S(Bytes, llvm::support::little);
BinaryStreamReader SR(S);
auto EC = consume(SR, Item);
Data = Data.take_back(SR.bytesRemaining());
return EC;
}
Error llvm::codeview::consume(BinaryStreamReader &Reader, int32_t &Item) {
return Reader.readInteger(Item);
}
Error llvm::codeview::consume(BinaryStreamReader &Reader, StringRef &Item) {
if (Reader.empty())
return make_error<CodeViewError>(cv_error_code::corrupt_record,
"Null terminated string buffer is empty!");
return Reader.readCString(Item);
}
Expected<CVSymbol> llvm::codeview::readSymbolFromStream(BinaryStreamRef Stream,
uint32_t Offset) {
return readCVRecordFromStream<SymbolKind>(Stream, Offset);
}
|