1 //===-- llvm/CodeGen/GCMetadataPrinter.h - Prints asm GC tables -*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // The abstract base class GCMetadataPrinter supports writing GC metadata tables 11 // as assembly code. This is a separate class from GCStrategy in order to allow 12 // users of the LLVM JIT to avoid linking with the AsmWriter. 13 // 14 // Subclasses of GCMetadataPrinter must be registered using the 15 // GCMetadataPrinterRegistry. This is separate from the GCStrategy itself 16 // because these subclasses are logically plugins for the AsmWriter. 17 // 18 //===----------------------------------------------------------------------===// 19 20 #ifndef LLVM_CODEGEN_GCMETADATAPRINTER_H 21 #define LLVM_CODEGEN_GCMETADATAPRINTER_H 22 23 #include "llvm/CodeGen/GCMetadata.h" 24 #include "llvm/CodeGen/GCStrategy.h" 25 #include "llvm/Support/Registry.h" 26 27 namespace llvm { 28 29 class GCMetadataPrinter; 30 31 /// GCMetadataPrinterRegistry - The GC assembly printer registry uses all the 32 /// defaults from Registry. 33 typedef Registry<GCMetadataPrinter> GCMetadataPrinterRegistry; 34 35 /// GCMetadataPrinter - Emits GC metadata as assembly code. Instances are 36 /// created, managed, and owned by the AsmPrinter. 37 class GCMetadataPrinter { 38 private: 39 GCStrategy *S; 40 friend class AsmPrinter; 41 42 protected: 43 // May only be subclassed. 44 GCMetadataPrinter(); 45 46 private: 47 GCMetadataPrinter(const GCMetadataPrinter &) = delete; 48 GCMetadataPrinter &operator=(const GCMetadataPrinter &) = delete; 49 50 public: 51 GCStrategy &getStrategy() { return *S; } 52 53 /// Called before the assembly for the module is generated by 54 /// the AsmPrinter (but after target specific hooks.) 55 virtual void beginAssembly(Module &M, GCModuleInfo &Info, AsmPrinter &AP) {} 56 /// Called after the assembly for the module is generated by 57 /// the AsmPrinter (but before target specific hooks) 58 virtual void finishAssembly(Module &M, GCModuleInfo &Info, AsmPrinter &AP) {} 59 60 virtual ~GCMetadataPrinter(); 61 }; 62 } 63 64 #endif 65
