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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 public:
     55   explicit ARMAsmPrinter(TargetMachine &TM,
     56                          std::unique_ptr<MCStreamer> Streamer);
     57 
     58   const char *getPassName() const override {
     59     return "ARM Assembly / Object Emitter";
     60   }
     61 
     62   void printOperand(const MachineInstr *MI, int OpNum, raw_ostream &O,
     63                     const char *Modifier = nullptr);
     64 
     65   bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNum,
     66                        unsigned AsmVariant, const char *ExtraCode,
     67                        raw_ostream &O) override;
     68   bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum,
     69                              unsigned AsmVariant, const char *ExtraCode,
     70                              raw_ostream &O) override;
     71 
     72   void emitInlineAsmEnd(const MCSubtargetInfo &StartInfo,
     73                         const MCSubtargetInfo *EndInfo) const override;
     74 
     75   void EmitJumpTable(const MachineInstr *MI);
     76   void EmitJump2Table(const MachineInstr *MI);
     77   void EmitInstruction(const MachineInstr *MI) override;
     78   bool runOnMachineFunction(MachineFunction &F) override;
     79 
     80   void EmitConstantPool() override {
     81     // we emit constant pools customly!
     82   }
     83   void EmitFunctionBodyEnd() override;
     84   void EmitFunctionEntryLabel() override;
     85   void EmitStartOfAsmFile(Module &M) override;
     86   void EmitEndOfAsmFile(Module &M) override;
     87   void EmitXXStructor(const Constant *CV) override;
     88 
     89   // lowerOperand - Convert a MachineOperand into the equivalent MCOperand.
     90   bool lowerOperand(const MachineOperand &MO, MCOperand &MCOp);
     91 
     92 private:
     93   // Helpers for EmitStartOfAsmFile() and EmitEndOfAsmFile()
     94   void emitAttributes();
     95 
     96   // Generic helper used to emit e.g. ARMv5 mul pseudos
     97   void EmitPatchedInstruction(const MachineInstr *MI, unsigned TargetOpc);
     98 
     99   void EmitUnwindingInstruction(const MachineInstr *MI);
    100 
    101   // emitPseudoExpansionLowering - tblgen'erated.
    102   bool emitPseudoExpansionLowering(MCStreamer &OutStreamer,
    103                                    const MachineInstr *MI);
    104 
    105 public:
    106   unsigned getISAEncoding() override {
    107     // ARM/Darwin adds ISA to the DWARF info for each function.
    108     Triple TT(TM.getTargetTriple());
    109     if (!TT.isOSBinFormatMachO())
    110       return 0;
    111     bool isThumb = TT.getArch() == Triple::thumb ||
    112                    TT.getArch() == Triple::thumbeb ||
    113                    TT.getSubArch() == Triple::ARMSubArch_v7m ||
    114                    TT.getSubArch() == Triple::ARMSubArch_v6m;
    115     return isThumb ? ARM::DW_ISA_ARM_thumb : ARM::DW_ISA_ARM_arm;
    116   }
    117 
    118 private:
    119   MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol);
    120   MCSymbol *GetARMJTIPICJumpTableLabel2(unsigned uid, unsigned uid2) const;
    121 
    122   MCSymbol *GetARMSJLJEHLabel() const;
    123 
    124   MCSymbol *GetARMGVSymbol(const GlobalValue *GV, unsigned char TargetFlags);
    125 
    126 public:
    127   /// EmitMachineConstantPoolValue - Print a machine constantpool value to
    128   /// the .s file.
    129   void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) override;
    130 };
    131 } // end namespace llvm
    132 
    133 #endif
    134