73 lines
2.5 KiB
C
73 lines
2.5 KiB
C
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//===- llvm/CodeGen/GCMetadataPrinter.h - Prints asm GC tables --*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// The abstract base class GCMetadataPrinter supports writing GC metadata tables
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// as assembly code. This is a separate class from GCStrategy in order to allow
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// users of the LLVM JIT to avoid linking with the AsmWriter.
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//
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// Subclasses of GCMetadataPrinter must be registered using the
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// GCMetadataPrinterRegistry. This is separate from the GCStrategy itself
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// because these subclasses are logically plugins for the AsmWriter.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_GCMETADATAPRINTER_H
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#define LLVM_CODEGEN_GCMETADATAPRINTER_H
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#include "llvm/Support/Registry.h"
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namespace llvm {
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class AsmPrinter;
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class GCMetadataPrinter;
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class GCModuleInfo;
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class GCStrategy;
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class Module;
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class StackMaps;
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/// GCMetadataPrinterRegistry - The GC assembly printer registry uses all the
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/// defaults from Registry.
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using GCMetadataPrinterRegistry = Registry<GCMetadataPrinter>;
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/// GCMetadataPrinter - Emits GC metadata as assembly code. Instances are
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/// created, managed, and owned by the AsmPrinter.
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class GCMetadataPrinter {
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private:
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friend class AsmPrinter;
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GCStrategy *S;
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protected:
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// May only be subclassed.
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GCMetadataPrinter();
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public:
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GCMetadataPrinter(const GCMetadataPrinter &) = delete;
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GCMetadataPrinter &operator=(const GCMetadataPrinter &) = delete;
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virtual ~GCMetadataPrinter();
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GCStrategy &getStrategy() { return *S; }
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/// Called before the assembly for the module is generated by
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/// the AsmPrinter (but after target specific hooks.)
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virtual void beginAssembly(Module &M, GCModuleInfo &Info, AsmPrinter &AP) {}
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/// Called after the assembly for the module is generated by
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/// the AsmPrinter (but before target specific hooks)
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virtual void finishAssembly(Module &M, GCModuleInfo &Info, AsmPrinter &AP) {}
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/// Called when the stack maps are generated. Return true if
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/// stack maps with a custom format are generated. Otherwise
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/// returns false and the default format will be used.
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virtual bool emitStackMaps(StackMaps &SM, AsmPrinter &AP) { return false; }
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};
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} // end namespace llvm
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#endif // LLVM_CODEGEN_GCMETADATAPRINTER_H
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