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 public: ARMAsmPrinter(TargetMachine & TM,MCStreamer & Streamer)55 explicit ARMAsmPrinter(TargetMachine &TM, MCStreamer &Streamer) 56 : AsmPrinter(TM, Streamer), AFI(nullptr), MCP(nullptr), 57 InConstantPool(false) { 58 Subtarget = &TM.getSubtarget<ARMSubtarget>(); 59 } 60 getPassName()61 const char *getPassName() const override { 62 return "ARM Assembly / Object Emitter"; 63 } 64 65 void printOperand(const MachineInstr *MI, int OpNum, raw_ostream &O, 66 const char *Modifier = nullptr); 67 68 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNum, 69 unsigned AsmVariant, const char *ExtraCode, 70 raw_ostream &O) override; 71 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum, 72 unsigned AsmVariant, const char *ExtraCode, 73 raw_ostream &O) override; 74 75 void emitInlineAsmEnd(const MCSubtargetInfo &StartInfo, 76 const MCSubtargetInfo *EndInfo) const override; 77 78 void EmitJumpTable(const MachineInstr *MI); 79 void EmitJump2Table(const MachineInstr *MI); 80 void EmitInstruction(const MachineInstr *MI) override; 81 bool runOnMachineFunction(MachineFunction &F) override; 82 EmitConstantPool()83 void EmitConstantPool() override { 84 // we emit constant pools customly! 85 } 86 void EmitFunctionBodyEnd() override; 87 void EmitFunctionEntryLabel() override; 88 void EmitStartOfAsmFile(Module &M) override; 89 void EmitEndOfAsmFile(Module &M) override; 90 void EmitXXStructor(const Constant *CV) override; 91 92 // lowerOperand - Convert a MachineOperand into the equivalent MCOperand. 93 bool lowerOperand(const MachineOperand &MO, MCOperand &MCOp); 94 95 private: 96 // Helpers for EmitStartOfAsmFile() and EmitEndOfAsmFile() 97 void emitAttributes(); 98 99 // Generic helper used to emit e.g. ARMv5 mul pseudos 100 void EmitPatchedInstruction(const MachineInstr *MI, unsigned TargetOpc); 101 102 void EmitUnwindingInstruction(const MachineInstr *MI); 103 104 // emitPseudoExpansionLowering - tblgen'erated. 105 bool emitPseudoExpansionLowering(MCStreamer &OutStreamer, 106 const MachineInstr *MI); 107 108 public: getISAEncoding()109 unsigned getISAEncoding() override { 110 // ARM/Darwin adds ISA to the DWARF info for each function. 111 if (!Subtarget->isTargetMachO()) 112 return 0; 113 return Subtarget->isThumb() ? 114 ARM::DW_ISA_ARM_thumb : ARM::DW_ISA_ARM_arm; 115 } 116 117 private: 118 MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol); 119 MCSymbol *GetARMJTIPICJumpTableLabel2(unsigned uid, unsigned uid2) const; 120 121 MCSymbol *GetARMSJLJEHLabel() const; 122 123 MCSymbol *GetARMGVSymbol(const GlobalValue *GV, unsigned char TargetFlags); 124 125 public: 126 /// EmitMachineConstantPoolValue - Print a machine constantpool value to 127 /// the .s file. 128 void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) override; 129 }; 130 } // end namespace llvm 131 132 #endif 133