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/Support/Registry.h" 24 25 namespace llvm { 26 27 class AsmPrinter; 28 class GCMetadataPrinter; 29 class GCModuleInfo; 30 class GCStrategy; 31 class Module; 32 33 /// GCMetadataPrinterRegistry - The GC assembly printer registry uses all the 34 /// defaults from Registry. 35 using GCMetadataPrinterRegistry = Registry<GCMetadataPrinter>; 36 37 /// GCMetadataPrinter - Emits GC metadata as assembly code. Instances are 38 /// created, managed, and owned by the AsmPrinter. 39 class GCMetadataPrinter { 40 private: 41 friend class AsmPrinter; 42 43 GCStrategy *S; 44 45 protected: 46 // May only be subclassed. 47 GCMetadataPrinter(); 48 49 public: 50 GCMetadataPrinter(const GCMetadataPrinter &) = delete; 51 GCMetadataPrinter &operator=(const GCMetadataPrinter &) = delete; 52 virtual ~GCMetadataPrinter(); 53 getStrategy()54 GCStrategy &getStrategy() { return *S; } 55 56 /// Called before the assembly for the module is generated by 57 /// the AsmPrinter (but after target specific hooks.) beginAssembly(Module & M,GCModuleInfo & Info,AsmPrinter & AP)58 virtual void beginAssembly(Module &M, GCModuleInfo &Info, AsmPrinter &AP) {} 59 60 /// Called after the assembly for the module is generated by 61 /// the AsmPrinter (but before target specific hooks) finishAssembly(Module & M,GCModuleInfo & Info,AsmPrinter & AP)62 virtual void finishAssembly(Module &M, GCModuleInfo &Info, AsmPrinter &AP) {} 63 }; 64 65 } // end namespace llvm 66 67 #endif // LLVM_CODEGEN_GCMETADATAPRINTER_H 68