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annotate lib/Target/ARM/ARMAsmPrinter.h @ 120:1172e4bd9c6f

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update 4.0.0
author mir3636
date Fri, 25 Nov 2016 19:14:25 +0900
parents 7d135dc70f03
children 803732b1fca8
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1 //===-- ARMAsmPrinter.h - ARM implementation of AsmPrinter ------*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9
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10 #ifndef LLVM_LIB_TARGET_ARM_ARMASMPRINTER_H
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11 #define LLVM_LIB_TARGET_ARM_ARMASMPRINTER_H
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13 #include "ARMSubtarget.h"
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14 #include "llvm/CodeGen/AsmPrinter.h"
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15 #include "llvm/Target/TargetMachine.h"
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16
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17 namespace llvm {
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18
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19 class ARMFunctionInfo;
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20 class MCOperand;
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21 class MachineConstantPool;
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22 class MachineOperand;
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23 class MCSymbol;
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24
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25 namespace ARM {
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26 enum DW_ISA {
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27 DW_ISA_ARM_thumb = 1,
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28 DW_ISA_ARM_arm = 2
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29 };
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30 }
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31
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32 class LLVM_LIBRARY_VISIBILITY ARMAsmPrinter : public AsmPrinter {
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33
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34 /// Subtarget - Keep a pointer to the ARMSubtarget around so that we can
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35 /// make the right decision when printing asm code for different targets.
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36 const ARMSubtarget *Subtarget;
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37
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38 /// AFI - Keep a pointer to ARMFunctionInfo for the current
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39 /// MachineFunction.
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40 ARMFunctionInfo *AFI;
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41
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42 /// MCP - Keep a pointer to constantpool entries of the current
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43 /// MachineFunction.
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44 const MachineConstantPool *MCP;
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45
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46 /// InConstantPool - Maintain state when emitting a sequence of constant
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47 /// pool entries so we can properly mark them as data regions.
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48 bool InConstantPool;
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49
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50 /// ThumbIndirectPads - These maintain a per-function list of jump pad
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51 /// labels used for ARMv4t thumb code to make register indirect calls.
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52 SmallVector<std::pair<unsigned, MCSymbol*>, 4> ThumbIndirectPads;
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53
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54 /// OptimizationGoals - Maintain a combined optimization goal for all
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55 /// functions in a module: one of Tag_ABI_optimization_goals values,
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56 /// -1 if uninitialized, 0 if conflicting goals
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57 int OptimizationGoals;
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58
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59 /// List of globals that have had their storage promoted to a constant
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60 /// pool. This lives between calls to runOnMachineFunction and collects
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61 /// data from every MachineFunction. It is used during doFinalization
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62 /// when all non-function globals are emitted.
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63 SmallPtrSet<const GlobalVariable*,2> PromotedGlobals;
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64 /// Set of globals in PromotedGlobals that we've emitted labels for.
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65 /// We need to emit labels even for promoted globals so that DWARF
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66 /// debug info can link properly.
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67 SmallPtrSet<const GlobalVariable*,2> EmittedPromotedGlobalLabels;
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68
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69 public:
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70 explicit ARMAsmPrinter(TargetMachine &TM,
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71 std::unique_ptr<MCStreamer> Streamer);
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72
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73 StringRef getPassName() const override {
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74 return "ARM Assembly Printer";
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75 }
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77 void printOperand(const MachineInstr *MI, int OpNum, raw_ostream &O);
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78
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79 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNum,
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80 unsigned AsmVariant, const char *ExtraCode,
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81 raw_ostream &O) override;
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82 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum,
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83 unsigned AsmVariant, const char *ExtraCode,
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84 raw_ostream &O) override;
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85
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86 void emitInlineAsmEnd(const MCSubtargetInfo &StartInfo,
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87 const MCSubtargetInfo *EndInfo) const override;
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89 void EmitJumpTableAddrs(const MachineInstr *MI);
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90 void EmitJumpTableInsts(const MachineInstr *MI);
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91 void EmitJumpTableTBInst(const MachineInstr *MI, unsigned OffsetWidth);
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92 void EmitInstruction(const MachineInstr *MI) override;
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93 bool runOnMachineFunction(MachineFunction &F) override;
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94
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95 void EmitConstantPool() override {
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96 // we emit constant pools customly!
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97 }
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98 void EmitFunctionBodyEnd() override;
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99 void EmitFunctionEntryLabel() override;
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100 void EmitStartOfAsmFile(Module &M) override;
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101 void EmitEndOfAsmFile(Module &M) override;
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102 void EmitXXStructor(const DataLayout &DL, const Constant *CV) override;
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103 void EmitGlobalVariable(const GlobalVariable *GV) override;
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104
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105 // lowerOperand - Convert a MachineOperand into the equivalent MCOperand.
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106 bool lowerOperand(const MachineOperand &MO, MCOperand &MCOp);
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107
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108 //===------------------------------------------------------------------===//
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109 // XRay implementation
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110 //===------------------------------------------------------------------===//
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111 public:
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112 // XRay-specific lowering for ARM.
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113 void LowerPATCHABLE_FUNCTION_ENTER(const MachineInstr &MI);
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114 void LowerPATCHABLE_FUNCTION_EXIT(const MachineInstr &MI);
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115 void LowerPATCHABLE_TAIL_CALL(const MachineInstr &MI);
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116 // Helper function that emits the XRay sleds we've collected for a particular
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117 // function.
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118 void EmitXRayTable();
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119
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120 private:
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121 void EmitSled(const MachineInstr &MI, SledKind Kind);
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122
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123 // Helpers for EmitStartOfAsmFile() and EmitEndOfAsmFile()
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124 void emitAttributes();
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125
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126 // Generic helper used to emit e.g. ARMv5 mul pseudos
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127 void EmitPatchedInstruction(const MachineInstr *MI, unsigned TargetOpc);
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128
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129 void EmitUnwindingInstruction(const MachineInstr *MI);
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130
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131 // emitPseudoExpansionLowering - tblgen'erated.
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132 bool emitPseudoExpansionLowering(MCStreamer &OutStreamer,
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133 const MachineInstr *MI);
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134
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135 public:
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136 unsigned getISAEncoding() override {
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137 // ARM/Darwin adds ISA to the DWARF info for each function.
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138 const Triple &TT = TM.getTargetTriple();
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139 if (!TT.isOSBinFormatMachO())
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140 return 0;
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141 bool isThumb = TT.getArch() == Triple::thumb ||
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142 TT.getArch() == Triple::thumbeb ||
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143 TT.getSubArch() == Triple::ARMSubArch_v7m ||
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144 TT.getSubArch() == Triple::ARMSubArch_v6m;
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145 return isThumb ? ARM::DW_ISA_ARM_thumb : ARM::DW_ISA_ARM_arm;
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146 }
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147
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148 private:
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149 MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol);
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150 MCSymbol *GetARMJTIPICJumpTableLabel(unsigned uid) const;
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151
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152 MCSymbol *GetARMGVSymbol(const GlobalValue *GV, unsigned char TargetFlags);
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153
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154 public:
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155 /// EmitMachineConstantPoolValue - Print a machine constantpool value to
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156 /// the .s file.
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157 void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) override;
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158 };
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159 } // end namespace llvm
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160
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161 #endif