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//===-- llvm/CodeGen/GCMetadataPrinter.h - Prints asm GC tables -*- C++ -*-===//
//                     The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// The abstract base class GCMetadataPrinter supports writing GC metadata tables
// as assembly code. This is a separate class from GCStrategy in order to allow
// users of the LLVM JIT to avoid linking with the AsmWriter.
// Subclasses of GCMetadataPrinter must be registered using the
// GCMetadataPrinterRegistry. This is separate from the GCStrategy itself
// because these subclasses are logically plugins for the AsmWriter.


#include "llvm/CodeGen/GCMetadata.h"
#include "llvm/CodeGen/GCStrategy.h"
#include "llvm/Support/Registry.h"

namespace llvm {

  class GCMetadataPrinter;

  /// GCMetadataPrinterRegistry - The GC assembly printer registry uses all the
  /// defaults from Registry.
  typedef Registry<GCMetadataPrinter> GCMetadataPrinterRegistry;

  /// GCMetadataPrinter - Emits GC metadata as assembly code.  Instances are
  /// created, managed, and owned by the AsmPrinter.
  class GCMetadataPrinter {
    GCStrategy *S;
    friend class AsmPrinter;

    // May only be subclassed.

    GCMetadataPrinter(const GCMetadataPrinter &) LLVM_DELETED_FUNCTION;
    GCMetadataPrinter &
      operator=(const GCMetadataPrinter &) LLVM_DELETED_FUNCTION;

    GCStrategy &getStrategy() { return *S; }

    /// Called before the assembly for the module is generated by
    /// the AsmPrinter (but after target specific hooks.)
    virtual void beginAssembly(Module &M, GCModuleInfo &Info,
                               AsmPrinter &AP) {}
    /// Called after the assembly for the module is generated by
    /// the AsmPrinter (but before target specific hooks)
    virtual void finishAssembly(Module &M, GCModuleInfo &Info,
                                AsmPrinter &AP) {}

    virtual ~GCMetadataPrinter();