mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-24 11:42:57 +01:00
117 lines
3.7 KiB
C++
117 lines
3.7 KiB
C++
//===- YAML.h - YAMLIO utilities for object files ---------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file declares utility classes for handling the YAML representation of
|
|
// object files.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_OBJECT_YAML_H
|
|
#define LLVM_OBJECT_YAML_H
|
|
|
|
#include "llvm/Support/YAMLTraits.h"
|
|
|
|
namespace llvm {
|
|
namespace object {
|
|
namespace yaml {
|
|
|
|
/// \brief Specialized YAMLIO scalar type for representing a binary blob.
|
|
///
|
|
/// A typical use case would be to represent the content of a section in a
|
|
/// binary file.
|
|
/// This class has custom YAMLIO traits for convenient reading and writing.
|
|
/// It renders as a string of hex digits in a YAML file.
|
|
/// For example, it might render as `DEADBEEFCAFEBABE` (YAML does not
|
|
/// require the quotation marks, so for simplicity when outputting they are
|
|
/// omitted).
|
|
/// When reading, any string whose content is an even number of hex digits
|
|
/// will be accepted.
|
|
/// For example, all of the following are acceptable:
|
|
/// `DEADBEEF`, `"DeADbEeF"`, `"\x44EADBEEF"` (Note: '\x44' == 'D')
|
|
///
|
|
/// A significant advantage of using this class is that it never allocates
|
|
/// temporary strings or buffers for any of its functionality.
|
|
///
|
|
/// Example:
|
|
///
|
|
/// The YAML mapping:
|
|
/// \code
|
|
/// Foo: DEADBEEFCAFEBABE
|
|
/// \endcode
|
|
///
|
|
/// Could be modeled in YAMLIO by the struct:
|
|
/// \code
|
|
/// struct FooHolder {
|
|
/// BinaryRef Foo;
|
|
/// };
|
|
/// namespace llvm {
|
|
/// namespace yaml {
|
|
/// template <>
|
|
/// struct MappingTraits<FooHolder> {
|
|
/// static void mapping(IO &IO, FooHolder &FH) {
|
|
/// IO.mapRequired("Foo", FH.Foo);
|
|
/// }
|
|
/// };
|
|
/// } // end namespace yaml
|
|
/// } // end namespace llvm
|
|
/// \endcode
|
|
class BinaryRef {
|
|
friend bool operator==(const BinaryRef &LHS, const BinaryRef &RHS);
|
|
/// \brief Either raw binary data, or a string of hex bytes (must always
|
|
/// be an even number of characters).
|
|
ArrayRef<uint8_t> Data;
|
|
/// \brief Discriminator between the two states of the `Data` member.
|
|
bool DataIsHexString;
|
|
|
|
public:
|
|
BinaryRef(ArrayRef<uint8_t> Data) : Data(Data), DataIsHexString(false) {}
|
|
BinaryRef(StringRef Data)
|
|
: Data(reinterpret_cast<const uint8_t *>(Data.data()), Data.size()),
|
|
DataIsHexString(true) {}
|
|
BinaryRef() : DataIsHexString(true) {}
|
|
/// \brief The number of bytes that are represented by this BinaryRef.
|
|
/// This is the number of bytes that writeAsBinary() will write.
|
|
ArrayRef<uint8_t>::size_type binary_size() const {
|
|
if (DataIsHexString)
|
|
return Data.size() / 2;
|
|
return Data.size();
|
|
}
|
|
/// \brief Write the contents (regardless of whether it is binary or a
|
|
/// hex string) as binary to the given raw_ostream.
|
|
void writeAsBinary(raw_ostream &OS) const;
|
|
/// \brief Write the contents (regardless of whether it is binary or a
|
|
/// hex string) as hex to the given raw_ostream.
|
|
///
|
|
/// For example, a possible output could be `DEADBEEFCAFEBABE`.
|
|
void writeAsHex(raw_ostream &OS) const;
|
|
};
|
|
|
|
inline bool operator==(const BinaryRef &LHS, const BinaryRef &RHS) {
|
|
// Special case for default constructed BinaryRef.
|
|
if (LHS.Data.empty() && RHS.Data.empty())
|
|
return true;
|
|
|
|
return LHS.DataIsHexString == RHS.DataIsHexString && LHS.Data == RHS.Data;
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
namespace yaml {
|
|
template <> struct ScalarTraits<object::yaml::BinaryRef> {
|
|
static void output(const object::yaml::BinaryRef &, void *,
|
|
llvm::raw_ostream &);
|
|
static StringRef input(StringRef, void *, object::yaml::BinaryRef &);
|
|
};
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|