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//===- RecordSerialization.h ------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_DEBUGINFO_CODEVIEW_RECORDSERIALIZATION_H
#define LLVM_DEBUGINFO_CODEVIEW_RECORDSERIALIZATION_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/DebugInfo/CodeView/CodeView.h"
#include "llvm/DebugInfo/CodeView/CodeViewError.h"
#include "llvm/Support/BinaryStreamReader.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/Error.h"
#include <cinttypes>
namespace llvm {
class APSInt;
namespace codeview {
using llvm::support::little32_t;
using llvm::support::ulittle16_t;
using llvm::support::ulittle32_t;
/// Limit on the size of all codeview symbol and type records, including the
/// RecordPrefix. MSVC does not emit any records larger than this.
enum : unsigned { MaxRecordLength = 0xFF00 };
struct RecordPrefix {
RecordPrefix() = default;
explicit RecordPrefix(uint16_t Kind) : RecordLen(2), RecordKind(Kind) {}
ulittle16_t RecordLen; // Record length, starting from &RecordKind.
ulittle16_t RecordKind; // Record kind enum (SymRecordKind or TypeRecordKind)
};
/// 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 getBytesAsCharacters(ArrayRef<uint8_t> LeafData);
StringRef getBytesAsCString(ArrayRef<uint8_t> LeafData);
inline Error consume(BinaryStreamReader &Reader) { return Error::success(); }
/// Decodes a numeric "leaf" value. These are integer literals encountered in
/// the type stream. If the value is positive and less than LF_NUMERIC (1 <<
/// 15), it is emitted directly in Data. Otherwise, it has a tag like LF_CHAR
/// that indicates the bitwidth and sign of the numeric data.
Error consume(BinaryStreamReader &Reader, APSInt &Num);
/// Decodes a numeric leaf value that is known to be a particular type.
Error consume_numeric(BinaryStreamReader &Reader, uint64_t &Value);
/// Decodes signed and unsigned fixed-length integers.
Error consume(BinaryStreamReader &Reader, uint32_t &Item);
Error consume(BinaryStreamReader &Reader, int32_t &Item);
/// Decodes a null terminated string.
Error consume(BinaryStreamReader &Reader, StringRef &Item);
Error consume(StringRef &Data, APSInt &Num);
Error consume(StringRef &Data, uint32_t &Item);
/// Decodes an arbitrary object whose layout matches that of the underlying
/// byte sequence, and returns a pointer to the object.
template <typename T> Error consume(BinaryStreamReader &Reader, T *&Item) {
return Reader.readObject(Item);
}
template <typename T, typename U> struct serialize_conditional_impl {
serialize_conditional_impl(T &Item, U Func) : Item(Item), Func(Func) {}
Error deserialize(BinaryStreamReader &Reader) const {
if (!Func())
return Error::success();
return consume(Reader, Item);
}
T &Item;
U Func;
};
template <typename T, typename U>
serialize_conditional_impl<T, U> serialize_conditional(T &Item, U Func) {
return serialize_conditional_impl<T, U>(Item, Func);
}
template <typename T, typename U> struct serialize_array_impl {
serialize_array_impl(ArrayRef<T> &Item, U Func) : Item(Item), Func(Func) {}
Error deserialize(BinaryStreamReader &Reader) const {
return Reader.readArray(Item, Func());
}
ArrayRef<T> &Item;
U Func;
};
template <typename T> struct serialize_vector_tail_impl {
serialize_vector_tail_impl(std::vector<T> &Item) : Item(Item) {}
Error deserialize(BinaryStreamReader &Reader) const {
T Field;
// Stop when we run out of bytes or we hit record padding bytes.
while (!Reader.empty() && Reader.peek() < LF_PAD0) {
if (auto EC = consume(Reader, Field))
return EC;
Item.push_back(Field);
}
return Error::success();
}
std::vector<T> &Item;
};
struct serialize_null_term_string_array_impl {
serialize_null_term_string_array_impl(std::vector<StringRef> &Item)
: Item(Item) {}
Error deserialize(BinaryStreamReader &Reader) const {
if (Reader.empty())
return make_error<CodeViewError>(cv_error_code::insufficient_buffer,
"Null terminated string is empty!");
while (Reader.peek() != 0) {
StringRef Field;
if (auto EC = Reader.readCString(Field))
return EC;
Item.push_back(Field);
}
return Reader.skip(1);
}
std::vector<StringRef> &Item;
};
template <typename T> struct serialize_arrayref_tail_impl {
serialize_arrayref_tail_impl(ArrayRef<T> &Item) : Item(Item) {}
Error deserialize(BinaryStreamReader &Reader) const {
uint32_t Count = Reader.bytesRemaining() / sizeof(T);
return Reader.readArray(Item, Count);
}
ArrayRef<T> &Item;
};
template <typename T> struct serialize_numeric_impl {
serialize_numeric_impl(T &Item) : Item(Item) {}
Error deserialize(BinaryStreamReader &Reader) const {
return consume_numeric(Reader, Item);
}
T &Item;
};
template <typename T, typename U>
serialize_array_impl<T, U> serialize_array(ArrayRef<T> &Item, U Func) {
return serialize_array_impl<T, U>(Item, Func);
}
inline serialize_null_term_string_array_impl
serialize_null_term_string_array(std::vector<StringRef> &Item) {
return serialize_null_term_string_array_impl(Item);
}
template <typename T>
serialize_vector_tail_impl<T> serialize_array_tail(std::vector<T> &Item) {
return serialize_vector_tail_impl<T>(Item);
}
template <typename T>
serialize_arrayref_tail_impl<T> serialize_array_tail(ArrayRef<T> &Item) {
return serialize_arrayref_tail_impl<T>(Item);
}
template <typename T> serialize_numeric_impl<T> serialize_numeric(T &Item) {
return serialize_numeric_impl<T>(Item);
}
template <typename T, typename U>
Error consume(BinaryStreamReader &Reader,
const serialize_conditional_impl<T, U> &Item) {
return Item.deserialize(Reader);
}
template <typename T, typename U>
Error consume(BinaryStreamReader &Reader,
const serialize_array_impl<T, U> &Item) {
return Item.deserialize(Reader);
}
inline Error consume(BinaryStreamReader &Reader,
const serialize_null_term_string_array_impl &Item) {
return Item.deserialize(Reader);
}
template <typename T>
Error consume(BinaryStreamReader &Reader,
const serialize_vector_tail_impl<T> &Item) {
return Item.deserialize(Reader);
}
template <typename T>
Error consume(BinaryStreamReader &Reader,
const serialize_arrayref_tail_impl<T> &Item) {
return Item.deserialize(Reader);
}
template <typename T>
Error consume(BinaryStreamReader &Reader,
const serialize_numeric_impl<T> &Item) {
return Item.deserialize(Reader);
}
template <typename T, typename U, typename... Args>
Error consume(BinaryStreamReader &Reader, T &&X, U &&Y, Args &&... Rest) {
if (auto EC = consume(Reader, X))
return EC;
return consume(Reader, Y, std::forward<Args>(Rest)...);
}
}
}
#endif
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