1 //===-- ARMAsmPrinter.h - ARM implementation of AsmPrinter ------*- 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 #ifndef LLVM_LIB_TARGET_ARM_ARMASMPRINTER_H 11 #define LLVM_LIB_TARGET_ARM_ARMASMPRINTER_H 12 13 #include "ARMSubtarget.h" 14 #include "llvm/CodeGen/AsmPrinter.h" 15 #include "llvm/Target/TargetMachine.h" 16 17 namespace llvm { 18 19 class ARMFunctionInfo; 20 class MCOperand; 21 class MachineConstantPool; 22 class MachineOperand; 23 class MCSymbol; 24 25 namespace ARM { 26 enum DW_ISA { 27 DW_ISA_ARM_thumb = 1, 28 DW_ISA_ARM_arm = 2 29 }; 30 } 31 32 class LLVM_LIBRARY_VISIBILITY ARMAsmPrinter : public AsmPrinter { 33 34 /// Subtarget - Keep a pointer to the ARMSubtarget around so that we can 35 /// make the right decision when printing asm code for different targets. 36 const ARMSubtarget *Subtarget; 37 38 /// AFI - Keep a pointer to ARMFunctionInfo for the current 39 /// MachineFunction. 40 ARMFunctionInfo *AFI; 41 42 /// MCP - Keep a pointer to constantpool entries of the current 43 /// MachineFunction. 44 const MachineConstantPool *MCP; 45 46 /// InConstantPool - Maintain state when emitting a sequence of constant 47 /// pool entries so we can properly mark them as data regions. 48 bool InConstantPool; 49 50 /// ThumbIndirectPads - These maintain a per-function list of jump pad 51 /// labels used for ARMv4t thumb code to make register indirect calls. 52 SmallVector<std::pair<unsigned, MCSymbol*>, 4> ThumbIndirectPads; 53 54 /// OptimizationGoals - Maintain a combined optimization goal for all 55 /// functions in a module: one of Tag_ABI_optimization_goals values, 56 /// -1 if uninitialized, 0 if conflicting goals 57 int OptimizationGoals; 58 59 public: 60 explicit ARMAsmPrinter(TargetMachine &TM, 61 std::unique_ptr<MCStreamer> Streamer); 62 getPassName()63 const char *getPassName() const override { 64 return "ARM Assembly / Object Emitter"; 65 } 66 67 void printOperand(const MachineInstr *MI, int OpNum, raw_ostream &O); 68 69 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNum, 70 unsigned AsmVariant, const char *ExtraCode, 71 raw_ostream &O) override; 72 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum, 73 unsigned AsmVariant, const char *ExtraCode, 74 raw_ostream &O) override; 75 76 void emitInlineAsmEnd(const MCSubtargetInfo &StartInfo, 77 const MCSubtargetInfo *EndInfo) const override; 78 79 void EmitJumpTableAddrs(const MachineInstr *MI); 80 void EmitJumpTableInsts(const MachineInstr *MI); 81 void EmitJumpTableTBInst(const MachineInstr *MI, unsigned OffsetWidth); 82 void EmitInstruction(const MachineInstr *MI) override; 83 bool runOnMachineFunction(MachineFunction &F) override; 84 EmitConstantPool()85 void EmitConstantPool() override { 86 // we emit constant pools customly! 87 } 88 void EmitFunctionBodyEnd() override; 89 void EmitFunctionEntryLabel() override; 90 void EmitStartOfAsmFile(Module &M) override; 91 void EmitEndOfAsmFile(Module &M) override; 92 void EmitXXStructor(const DataLayout &DL, const Constant *CV) override; 93 94 // lowerOperand - Convert a MachineOperand into the equivalent MCOperand. 95 bool lowerOperand(const MachineOperand &MO, MCOperand &MCOp); 96 97 private: 98 99 // Helpers for EmitStartOfAsmFile() and EmitEndOfAsmFile() 100 void emitAttributes(); 101 102 // Generic helper used to emit e.g. ARMv5 mul pseudos 103 void EmitPatchedInstruction(const MachineInstr *MI, unsigned TargetOpc); 104 105 void EmitUnwindingInstruction(const MachineInstr *MI); 106 107 // emitPseudoExpansionLowering - tblgen'erated. 108 bool emitPseudoExpansionLowering(MCStreamer &OutStreamer, 109 const MachineInstr *MI); 110 111 public: getISAEncoding()112 unsigned getISAEncoding() override { 113 // ARM/Darwin adds ISA to the DWARF info for each function. 114 const Triple &TT = TM.getTargetTriple(); 115 if (!TT.isOSBinFormatMachO()) 116 return 0; 117 bool isThumb = TT.getArch() == Triple::thumb || 118 TT.getArch() == Triple::thumbeb || 119 TT.getSubArch() == Triple::ARMSubArch_v7m || 120 TT.getSubArch() == Triple::ARMSubArch_v6m; 121 return isThumb ? ARM::DW_ISA_ARM_thumb : ARM::DW_ISA_ARM_arm; 122 } 123 124 private: 125 MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol); 126 MCSymbol *GetARMJTIPICJumpTableLabel(unsigned uid) const; 127 128 MCSymbol *GetARMGVSymbol(const GlobalValue *GV, unsigned char TargetFlags); 129 130 public: 131 /// EmitMachineConstantPoolValue - Print a machine constantpool value to 132 /// the .s file. 133 void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) override; 134 }; 135 } // end namespace llvm 136 137 #endif 138