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//===-- RecordSerialization.cpp -------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// 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/TypeRecord.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(ArrayRef<uint8_t> &Data, APSInt &Num) {
// Used to avoid overload ambiguity on APInt construtor.
bool FalseVal = false;
if (Data.size() < 2)
return make_error<CodeViewError>(
cv_error_code::insufficient_buffer,
"Buffer does not contain enough data for an APSInt");
uint16_t Short = *reinterpret_cast<const ulittle16_t *>(Data.data());
Data = Data.drop_front(2);
if (Short < LF_NUMERIC) {
Num = APSInt(APInt(/*numBits=*/16, Short, /*isSigned=*/false),
/*isUnsigned=*/true);
return Error::success();
}
switch (Short) {
case LF_CHAR:
if (Data.size() < 1)
return make_error<CodeViewError>(
cv_error_code::insufficient_buffer,
"Buffer does not contain enough data for an LF_CHAR");
Num = APSInt(APInt(/*numBits=*/8,
*reinterpret_cast<const int8_t *>(Data.data()),
/*isSigned=*/true),
/*isUnsigned=*/false);
Data = Data.drop_front(1);
return Error::success();
case LF_SHORT:
if (Data.size() < 2)
return make_error<CodeViewError>(
cv_error_code::insufficient_buffer,
"Buffer does not contain enough data for an LF_SHORT");
Num = APSInt(APInt(/*numBits=*/16,
*reinterpret_cast<const little16_t *>(Data.data()),
/*isSigned=*/true),
/*isUnsigned=*/false);
Data = Data.drop_front(2);
return Error::success();
case LF_USHORT:
if (Data.size() < 2)
return make_error<CodeViewError>(
cv_error_code::insufficient_buffer,
"Buffer does not contain enough data for an LF_USHORT");
Num = APSInt(APInt(/*numBits=*/16,
*reinterpret_cast<const ulittle16_t *>(Data.data()),
/*isSigned=*/false),
/*isUnsigned=*/true);
Data = Data.drop_front(2);
return Error::success();
case LF_LONG:
if (Data.size() < 4)
return make_error<CodeViewError>(
cv_error_code::insufficient_buffer,
"Buffer does not contain enough data for an LF_LONG");
Num = APSInt(APInt(/*numBits=*/32,
*reinterpret_cast<const little32_t *>(Data.data()),
/*isSigned=*/true),
/*isUnsigned=*/false);
Data = Data.drop_front(4);
return Error::success();
case LF_ULONG:
if (Data.size() < 4)
return make_error<CodeViewError>(
cv_error_code::insufficient_buffer,
"Buffer does not contain enough data for an LF_ULONG");
Num = APSInt(APInt(/*numBits=*/32,
*reinterpret_cast<const ulittle32_t *>(Data.data()),
/*isSigned=*/FalseVal),
/*isUnsigned=*/true);
Data = Data.drop_front(4);
return Error::success();
case LF_QUADWORD:
if (Data.size() < 8)
return make_error<CodeViewError>(
cv_error_code::insufficient_buffer,
"Buffer does not contain enough data for an LF_QUADWORD");
Num = APSInt(APInt(/*numBits=*/64,
*reinterpret_cast<const little64_t *>(Data.data()),
/*isSigned=*/true),
/*isUnsigned=*/false);
Data = Data.drop_front(8);
return Error::success();
case LF_UQUADWORD:
if (Data.size() < 8)
return make_error<CodeViewError>(
cv_error_code::insufficient_buffer,
"Buffer does not contain enough data for an LF_UQUADWORD");
Num = APSInt(APInt(/*numBits=*/64,
*reinterpret_cast<const ulittle64_t *>(Data.data()),
/*isSigned=*/false),
/*isUnsigned=*/true);
Data = Data.drop_front(8);
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());
auto EC = consume(Bytes, Num);
Data = StringRef(reinterpret_cast<const char *>(Bytes.data()), Bytes.size());
return EC;
}
/// Decode a numeric leaf value that is known to be a uint64_t.
Error llvm::codeview::consume_numeric(ArrayRef<uint8_t> &Data, uint64_t &Num) {
APSInt N;
if (auto EC = consume(Data, 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(ArrayRef<uint8_t> &Data, uint32_t &Item) {
const support::ulittle32_t *IntPtr;
if (auto EC = consumeObject(Data, IntPtr))
return EC;
Item = *IntPtr;
return Error::success();
}
Error llvm::codeview::consume(StringRef &Data, uint32_t &Item) {
ArrayRef<uint8_t> Bytes(Data.bytes_begin(), Data.bytes_end());
auto EC = consume(Bytes, Item);
Data = StringRef(reinterpret_cast<const char *>(Bytes.data()), Bytes.size());
return EC;
}
Error llvm::codeview::consume(ArrayRef<uint8_t> &Data, int32_t &Item) {
const support::little32_t *IntPtr;
if (auto EC = consumeObject(Data, IntPtr))
return EC;
Item = *IntPtr;
return Error::success();
}
Error llvm::codeview::consume(ArrayRef<uint8_t> &Data, StringRef &Item) {
if (Data.empty())
return make_error<CodeViewError>(cv_error_code::corrupt_record,
"Null terminated string buffer is empty!");
StringRef Rest;
std::tie(Item, Rest) = getBytesAsCharacters(Data).split('\0');
// We expect this to be null terminated. If it was not, it is an error.
if (Data.size() == Item.size())
return make_error<CodeViewError>(cv_error_code::corrupt_record,
"Expected null terminator!");
Data = ArrayRef<uint8_t>(Rest.bytes_begin(), Rest.bytes_end());
return Error::success();
}
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