ARMAsmPrinter.h revision 243830 
1179404Sobrien//===-- ARMAsmPrinter.h - Print machine code to an ARM .s file --*- C++ -*-===//
2179404Sobrien//
3179404Sobrien//                     The LLVM Compiler Infrastructure
4218822Sdim//
5179404Sobrien// This file is distributed under the University of Illinois Open Source
6179404Sobrien// License. See LICENSE.TXT for details.
7179404Sobrien//
8179404Sobrien//===----------------------------------------------------------------------===//
9179404Sobrien//
10179404Sobrien// ARM Assembly printer class.
11179404Sobrien//
12179404Sobrien//===----------------------------------------------------------------------===//
13179404Sobrien
14179404Sobrien#ifndef ARMASMPRINTER_H
15179404Sobrien#define ARMASMPRINTER_H
16179404Sobrien
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 LLVM_OVERRIDE {
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) LLVM_OVERRIDE;
66  virtual bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum,
67                                     unsigned AsmVariant, const char *ExtraCode,
68                                     raw_ostream &O) LLVM_OVERRIDE;
69
70  void EmitJumpTable(const MachineInstr *MI);
71  void EmitJump2Table(const MachineInstr *MI);
72  virtual void EmitInstruction(const MachineInstr *MI) LLVM_OVERRIDE;
73  virtual bool runOnMachineFunction(MachineFunction &F) LLVM_OVERRIDE;
74
75  virtual void EmitConstantPool() LLVM_OVERRIDE {
76    // we emit constant pools customly!
77  }
78  virtual void EmitFunctionBodyEnd() LLVM_OVERRIDE;
79  virtual void EmitFunctionEntryLabel() LLVM_OVERRIDE;
80  virtual void EmitStartOfAsmFile(Module &M) LLVM_OVERRIDE;
81  virtual void EmitEndOfAsmFile(Module &M) LLVM_OVERRIDE;
82  virtual void EmitXXStructor(const Constant *CV) LLVM_OVERRIDE;
83
84  // lowerOperand - Convert a MachineOperand into the equivalent MCOperand.
85  bool lowerOperand(const MachineOperand &MO, MCOperand &MCOp);
86
87private:
88  // Helpers for EmitStartOfAsmFile() and EmitEndOfAsmFile()
89  void emitAttributes();
90
91  // Helper for ELF .o only
92  void emitARMAttributeSection();
93
94  // Generic helper used to emit e.g. ARMv5 mul pseudos
95  void EmitPatchedInstruction(const MachineInstr *MI, unsigned TargetOpc);
96
97  void EmitUnwindingInstruction(const MachineInstr *MI);
98
99  // emitPseudoExpansionLowering - tblgen'erated.
100  bool emitPseudoExpansionLowering(MCStreamer &OutStreamer,
101                                   const MachineInstr *MI);
102
103public:
104  void PrintDebugValueComment(const MachineInstr *MI, raw_ostream &OS);
105
106  virtual MachineLocation
107    getDebugValueLocation(const MachineInstr *MI) const LLVM_OVERRIDE;
108
109  /// EmitDwarfRegOp - Emit dwarf register operation.
110  virtual void EmitDwarfRegOp(const MachineLocation &MLoc) const LLVM_OVERRIDE;
111
112  virtual unsigned getISAEncoding() LLVM_OVERRIDE {
113    // ARM/Darwin adds ISA to the DWARF info for each function.
114    if (!Subtarget->isTargetDarwin())
115      return 0;
116    return Subtarget->isThumb() ?
117      ARM::DW_ISA_ARM_thumb : ARM::DW_ISA_ARM_arm;
118  }
119
120private:
121  MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol);
122  MCSymbol *GetARMJTIPICJumpTableLabel2(unsigned uid, unsigned uid2) const;
123
124  MCSymbol *GetARMSJLJEHLabel(void) const;
125
126  MCSymbol *GetARMGVSymbol(const GlobalValue *GV);
127
128public:
129  /// EmitMachineConstantPoolValue - Print a machine constantpool value to
130  /// the .s file.
131  virtual void
132    EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) LLVM_OVERRIDE;
133};
134} // end namespace llvm
135
136#endif
137