ARMAsmPrinter.h revision 239462 
1//===-- ARMAsmPrinter.h - Print machine code to an ARM .s file --*- 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// ARM Assembly printer class.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef ARMASMPRINTER_H
15#define ARMASMPRINTER_H
16
17#include "ARM.h"
18#include "ARMTargetMachine.h"
19#include "llvm/CodeGen/AsmPrinter.h"
20#include "llvm/Support/Compiler.h"
21
22namespace llvm {
23
24class MCOperand;
25
26namespace ARM {
27  enum DW_ISA {
28    DW_ISA_ARM_thumb = 1,
29    DW_ISA_ARM_arm = 2
30  };
31}
32
33class LLVM_LIBRARY_VISIBILITY ARMAsmPrinter : public AsmPrinter {
34
35  /// Subtarget - Keep a pointer to the ARMSubtarget around so that we can
36  /// make the right decision when printing asm code for different targets.
37  const ARMSubtarget *Subtarget;
38
39  /// AFI - Keep a pointer to ARMFunctionInfo for the current
40  /// MachineFunction.
41  ARMFunctionInfo *AFI;
42
43  /// MCP - Keep a pointer to constantpool entries of the current
44  /// MachineFunction.
45  const MachineConstantPool *MCP;
46
47  /// InConstantPool - Maintain state when emitting a sequence of constant
48  /// pool entries so we can properly mark them as data regions.
49  bool InConstantPool;
50public:
51  explicit ARMAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
52    : AsmPrinter(TM, Streamer), AFI(NULL), MCP(NULL), InConstantPool(false) {
53      Subtarget = &TM.getSubtarget<ARMSubtarget>();
54    }
55
56  virtual const char *getPassName() const {
57    return "ARM Assembly Printer";
58  }
59
60  void printOperand(const MachineInstr *MI, int OpNum, raw_ostream &O,
61                    const char *Modifier = 0);
62
63  virtual bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNum,
64                               unsigned AsmVariant, const char *ExtraCode,
65                               raw_ostream &O);
66  virtual bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum,
67                                     unsigned AsmVariant,
68                                     const char *ExtraCode, raw_ostream &O);
69
70  void EmitJumpTable(const MachineInstr *MI);
71  void EmitJump2Table(const MachineInstr *MI);
72  virtual void EmitInstruction(const MachineInstr *MI);
73  bool runOnMachineFunction(MachineFunction &F);
74
75  virtual void EmitConstantPool() {} // we emit constant pools customly!
76  virtual void EmitFunctionBodyEnd();
77  virtual void EmitFunctionEntryLabel();
78  void EmitStartOfAsmFile(Module &M);
79  void EmitEndOfAsmFile(Module &M);
80  void EmitXXStructor(const Constant *CV);
81
82  // lowerOperand - Convert a MachineOperand into the equivalent MCOperand.
83  bool lowerOperand(const MachineOperand &MO, MCOperand &MCOp);
84
85private:
86  // Helpers for EmitStartOfAsmFile() and EmitEndOfAsmFile()
87  void emitAttributes();
88
89  // Helper for ELF .o only
90  void emitARMAttributeSection();
91
92  // Generic helper used to emit e.g. ARMv5 mul pseudos
93  void EmitPatchedInstruction(const MachineInstr *MI, unsigned TargetOpc);
94
95  void EmitUnwindingInstruction(const MachineInstr *MI);
96
97  // emitPseudoExpansionLowering - tblgen'erated.
98  bool emitPseudoExpansionLowering(MCStreamer &OutStreamer,
99                                   const MachineInstr *MI);
100
101public:
102  void PrintDebugValueComment(const MachineInstr *MI, raw_ostream &OS);
103
104  MachineLocation getDebugValueLocation(const MachineInstr *MI) const;
105
106  /// EmitDwarfRegOp - Emit dwarf register operation.
107  virtual void EmitDwarfRegOp(const MachineLocation &MLoc) const;
108
109  virtual unsigned getISAEncoding() {
110    // ARM/Darwin adds ISA to the DWARF info for each function.
111    if (!Subtarget->isTargetDarwin())
112      return 0;
113    return Subtarget->isThumb() ?
114      ARM::DW_ISA_ARM_thumb : ARM::DW_ISA_ARM_arm;
115  }
116
117  MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol);
118  MCSymbol *GetARMSetPICJumpTableLabel2(unsigned uid, unsigned uid2,
119                                        const MachineBasicBlock *MBB) const;
120  MCSymbol *GetARMJTIPICJumpTableLabel2(unsigned uid, unsigned uid2) const;
121
122  MCSymbol *GetARMSJLJEHLabel(void) const;
123
124  MCSymbol *GetARMGVSymbol(const GlobalValue *GV);
125
126  /// EmitMachineConstantPoolValue - Print a machine constantpool value to
127  /// the .s file.
128  virtual void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV);
129};
130} // end namespace llvm
131
132#endif
133