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
17namespace llvm {
18
19class ARMFunctionInfo;
20class MCOperand;
21class MachineConstantPool;
22class MachineOperand;
23class MCSymbol;
24
25namespace ARM {
26  enum DW_ISA {
27    DW_ISA_ARM_thumb = 1,
28    DW_ISA_ARM_arm = 2
29  };
30}
31
32class 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
59public:
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
97private:
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
110public:
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
123private:
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
129public:
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