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      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 ARMASMPRINTER_H
     11 #define 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 
     24 namespace ARM {
     25   enum DW_ISA {
     26     DW_ISA_ARM_thumb = 1,
     27     DW_ISA_ARM_arm = 2
     28   };
     29 }
     30 
     31 class LLVM_LIBRARY_VISIBILITY ARMAsmPrinter : public AsmPrinter {
     32 
     33   /// Subtarget - Keep a pointer to the ARMSubtarget around so that we can
     34   /// make the right decision when printing asm code for different targets.
     35   const ARMSubtarget *Subtarget;
     36 
     37   /// AFI - Keep a pointer to ARMFunctionInfo for the current
     38   /// MachineFunction.
     39   ARMFunctionInfo *AFI;
     40 
     41   /// MCP - Keep a pointer to constantpool entries of the current
     42   /// MachineFunction.
     43   const MachineConstantPool *MCP;
     44 
     45   /// InConstantPool - Maintain state when emitting a sequence of constant
     46   /// pool entries so we can properly mark them as data regions.
     47   bool InConstantPool;
     48 public:
     49   explicit ARMAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
     50     : AsmPrinter(TM, Streamer), AFI(nullptr), MCP(nullptr),
     51       InConstantPool(false) {
     52     Subtarget = &TM.getSubtarget<ARMSubtarget>();
     53   }
     54 
     55   const char *getPassName() const override {
     56     return "ARM Assembly / Object Emitter";
     57   }
     58 
     59   void printOperand(const MachineInstr *MI, int OpNum, raw_ostream &O,
     60                     const char *Modifier = nullptr);
     61 
     62   bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNum,
     63                        unsigned AsmVariant, const char *ExtraCode,
     64                        raw_ostream &O) override;
     65   bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum,
     66                              unsigned AsmVariant, const char *ExtraCode,
     67                              raw_ostream &O) override;
     68 
     69   void emitInlineAsmEnd(const MCSubtargetInfo &StartInfo,
     70                         const MCSubtargetInfo *EndInfo) const override;
     71 
     72   void EmitJumpTable(const MachineInstr *MI);
     73   void EmitJump2Table(const MachineInstr *MI);
     74   void EmitInstruction(const MachineInstr *MI) override;
     75   bool runOnMachineFunction(MachineFunction &F) override;
     76 
     77   void EmitConstantPool() override {
     78     // we emit constant pools customly!
     79   }
     80   void EmitFunctionBodyEnd() override;
     81   void EmitFunctionEntryLabel() override;
     82   void EmitStartOfAsmFile(Module &M) override;
     83   void EmitEndOfAsmFile(Module &M) override;
     84   void EmitXXStructor(const Constant *CV) override;
     85 
     86   // lowerOperand - Convert a MachineOperand into the equivalent MCOperand.
     87   bool lowerOperand(const MachineOperand &MO, MCOperand &MCOp);
     88 
     89 private:
     90   // Helpers for EmitStartOfAsmFile() and EmitEndOfAsmFile()
     91   void emitAttributes();
     92 
     93   // Generic helper used to emit e.g. ARMv5 mul pseudos
     94   void EmitPatchedInstruction(const MachineInstr *MI, unsigned TargetOpc);
     95 
     96   void EmitUnwindingInstruction(const MachineInstr *MI);
     97 
     98   // emitPseudoExpansionLowering - tblgen'erated.
     99   bool emitPseudoExpansionLowering(MCStreamer &OutStreamer,
    100                                    const MachineInstr *MI);
    101 
    102 public:
    103   unsigned getISAEncoding() override {
    104     // ARM/Darwin adds ISA to the DWARF info for each function.
    105     if (!Subtarget->isTargetMachO())
    106       return 0;
    107     return Subtarget->isThumb() ?
    108       ARM::DW_ISA_ARM_thumb : ARM::DW_ISA_ARM_arm;
    109   }
    110 
    111 private:
    112   MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol);
    113   MCSymbol *GetARMJTIPICJumpTableLabel2(unsigned uid, unsigned uid2) const;
    114 
    115   MCSymbol *GetARMSJLJEHLabel() const;
    116 
    117   MCSymbol *GetARMGVSymbol(const GlobalValue *GV, unsigned char TargetFlags);
    118 
    119 public:
    120   /// EmitMachineConstantPoolValue - Print a machine constantpool value to
    121   /// the .s file.
    122   void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) override;
    123 };
    124 } // end namespace llvm
    125 
    126 #endif
    127