lib/CodeGen/MachOCodeEmitter.h

   1 //===-- MachOEmitter.h - Target-independent Mach-O Emitter class ----------===//
   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 #ifndef MACHOCODEEMITTER_H
  11 #define MACHOCODEEMITTER_H
  12
  13 #include "llvm/CodeGen/ObjectCodeEmitter.h"
  14 #include <map>
  15
  16 namespace llvm {
  17
  18 class MachOWriter;
  19
  20 /// MachOCodeEmitter - This class is used by the MachOWriter to emit the code
  21 /// for functions to the Mach-O file.
  22
  23 class MachOCodeEmitter : public ObjectCodeEmitter {
  24   MachOWriter &MOW;
  25
  26   /// Target machine description.
  27   TargetMachine &TM;
  28
  29   /// is64Bit/isLittleEndian - This information is inferred from the target
  30   /// machine directly, indicating what header values and flags to set.
  31   bool is64Bit, isLittleEndian;
  32
  33   const TargetAsmInfo *TAI;
  34
  35   /// Relocations - These are the relocations that the function needs, as
  36   /// emitted.
  37   std::vector<MachineRelocation> Relocations;
  38
  39   std::map<uint64_t, uintptr_t> Labels;
  40
  41 public:
  42   MachOCodeEmitter(MachOWriter &mow, MachOSection &mos);
  43
  44   virtual void startFunction(MachineFunction &MF);
  45   virtual bool finishFunction(MachineFunction &MF);
  46
  47   virtual void addRelocation(const MachineRelocation &MR) {
  48     Relocations.push_back(MR);
  49   }
  50
  51   void emitConstantPool(MachineConstantPool *MCP);
  52   void emitJumpTables(MachineJumpTableInfo *MJTI);
  53
  54   virtual void emitLabel(uint64_t LabelID) {
  55     Labels[LabelID] = getCurrentPCOffset();
  56   }
  57
  58   virtual uintptr_t getLabelAddress(uint64_t Label) const {
  59     return Labels.find(Label)->second;
  60   }
  61
  62   virtual void setModuleInfo(llvm::MachineModuleInfo* MMI) { }
  63
  64 }; // end class MachOCodeEmitter
  65
  66 } // end namespace llvm
  67
  68 #endif
  69