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 
getPassName()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 
EmitConstantPool()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:
getISAEncoding()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