lib/IRGen/ConformanceDescription.h

//===--- ConformanceDescription.h - Conformance record ----------*- C++ -*-===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// This file defines the ConformanceDescription type, which records a
// conformance which needs to be emitted.
//
//===----------------------------------------------------------------------===//

#ifndef SWIFT_IRGEN_CONFORMANCEDESCRIPTION_H
#define SWIFT_IRGEN_CONFORMANCEDESCRIPTION_H

namespace llvm {
class Constant;
}

namespace swift {
class SILWitnessTable;

namespace irgen {

/// The description of a protocol conformance, including its witness table
/// and any additional information needed to produce the protocol conformance
/// descriptor.
class ConformanceDescription {
public:
  /// The conformance itself.
  RootProtocolConformance *conformance;

  /// The witness table.
  SILWitnessTable *wtable;

  /// The witness table pattern, which is also a complete witness table
  /// when \c requiresSpecialization is \c false.
  llvm::Constant *pattern;

  /// The size of the witness table.
  const uint16_t witnessTableSize;

  /// The private size of the witness table, allocated
  const uint16_t witnessTablePrivateSize;

  /// Whether this witness table requires runtime specialization.
  const unsigned requiresSpecialization : 1;

  /// The instantiation function, to be run at the end of witness table
  /// instantiation.
  llvm::Constant *instantiationFn = nullptr;

  /// The resilient witnesses, if any.
  SmallVector<llvm::Constant *, 4> resilientWitnesses;

  ConformanceDescription(RootProtocolConformance *conformance,
                         SILWitnessTable *wtable,
                         llvm::Constant *pattern,
                         uint16_t witnessTableSize,
                         uint16_t witnessTablePrivateSize,
                         bool requiresSpecialization)
    : conformance(conformance), wtable(wtable), pattern(pattern),
      witnessTableSize(witnessTableSize),
      witnessTablePrivateSize(witnessTablePrivateSize),
      requiresSpecialization(requiresSpecialization)
  {
  }
};

} // end namespace irgen
} // end namespace swift

#endif