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//===- llvm/CodeGen/GCMetadataPrinter.h - Prints asm GC tables --*- C++ -*-===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// 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/Support/Registry.h"
namespace llvm {
class AsmPrinter;
class GCMetadataPrinter;
class GCModuleInfo;
class GCStrategy;
class Module;
class StackMaps;
/// GCMetadataPrinterRegistry - The GC assembly printer registry uses all the
/// defaults from Registry.
using GCMetadataPrinterRegistry = Registry<GCMetadataPrinter>;
/// GCMetadataPrinter - Emits GC metadata as assembly code. Instances are
/// created, managed, and owned by the AsmPrinter.
class GCMetadataPrinter {
friend class AsmPrinter;
GCStrategy *S;
// May only be subclassed.
GCMetadataPrinter(const GCMetadataPrinter &) = delete;
GCMetadataPrinter &operator=(const GCMetadataPrinter &) = delete;
virtual ~GCMetadataPrinter();
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) {}
/// Called when the stack maps are generated. Return true if
/// stack maps with a custom format are generated. Otherwise
/// returns false and the default format will be used.
virtual bool emitStackMaps(StackMaps &SM, AsmPrinter &AP) { return false; }
} // end namespace llvm