llvm-mirror/include/llvm/CodeGen/GCMetadataPrinter.h

//===-- 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.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CODEGEN_GCMETADATAPRINTER_H
#define LLVM_CODEGEN_GCMETADATAPRINTER_H

#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 {
  private:
    GCStrategy *S;
    friend class AsmPrinter;

  protected:
    // May only be subclassed.
    GCMetadataPrinter();

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

  public:
    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();
  };

}

#endif