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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 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 
     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 
     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   // Helpers for EmitStartOfAsmFile() and EmitEndOfAsmFile()
     99   void emitAttributes();
    100 
    101   // Generic helper used to emit e.g. ARMv5 mul pseudos
    102   void EmitPatchedInstruction(const MachineInstr *MI, unsigned TargetOpc);
    103 
    104   void EmitUnwindingInstruction(const MachineInstr *MI);
    105 
    106   // emitPseudoExpansionLowering - tblgen'erated.
    107   bool emitPseudoExpansionLowering(MCStreamer &OutStreamer,
    108                                    const MachineInstr *MI);
    109 
    110 public:
    111   unsigned getISAEncoding() override {
    112     // ARM/Darwin adds ISA to the DWARF info for each function.
    113     const Triple &TT = TM.getTargetTriple();
    114     if (!TT.isOSBinFormatMachO())
    115       return 0;
    116     bool isThumb = TT.getArch() == Triple::thumb ||
    117                    TT.getArch() == Triple::thumbeb ||
    118                    TT.getSubArch() == Triple::ARMSubArch_v7m ||
    119                    TT.getSubArch() == Triple::ARMSubArch_v6m;
    120     return isThumb ? ARM::DW_ISA_ARM_thumb : ARM::DW_ISA_ARM_arm;
    121   }
    122 
    123 private:
    124   MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol);
    125   MCSymbol *GetARMJTIPICJumpTableLabel(unsigned uid) const;
    126 
    127   MCSymbol *GetARMGVSymbol(const GlobalValue *GV, unsigned char TargetFlags);
    128 
    129 public:
    130   /// EmitMachineConstantPoolValue - Print a machine constantpool value to
    131   /// the .s file.
    132   void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) override;
    133 };
    134 } // end namespace llvm
    135 
    136 #endif
    137