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1 //===---- MipsCCState.h - CCState with Mips specific extensions -----------===//
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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 MIPSCCSTATE_H
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11 #define MIPSCCSTATE_H
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12
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13 #include "MipsISelLowering.h"
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14 #include "llvm/ADT/SmallVector.h"
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15 #include "llvm/CodeGen/CallingConvLower.h"
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16
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17 namespace llvm {
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18 class SDNode;
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19 class MipsSubtarget;
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20
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21 class MipsCCState : public CCState {
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22 public:
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23 enum SpecialCallingConvType { Mips16RetHelperConv, NoSpecialCallingConv };
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24
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25 /// Determine the SpecialCallingConvType for the given callee
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26 static SpecialCallingConvType
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27 getSpecialCallingConvForCallee(const SDNode *Callee,
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28 const MipsSubtarget &Subtarget);
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29
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30 private:
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31 /// Identify lowered values that originated from f128 arguments and record
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32 /// this for use by RetCC_MipsN.
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33 void PreAnalyzeCallResultForF128(const SmallVectorImpl<ISD::InputArg> &Ins,
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34 const TargetLowering::CallLoweringInfo &CLI);
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35
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36 /// Identify lowered values that originated from f128 arguments and record
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37 /// this for use by RetCC_MipsN.
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38 void PreAnalyzeReturnForF128(const SmallVectorImpl<ISD::OutputArg> &Outs);
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39
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40 /// Identify lowered values that originated from f128 arguments and record
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41 /// this.
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42 void
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43 PreAnalyzeCallOperands(const SmallVectorImpl<ISD::OutputArg> &Outs,
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44 std::vector<TargetLowering::ArgListEntry> &FuncArgs,
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45 const SDNode *CallNode);
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46
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47 /// Identify lowered values that originated from f128 arguments and record
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48 /// this.
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49 void
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50 PreAnalyzeFormalArgumentsForF128(const SmallVectorImpl<ISD::InputArg> &Ins);
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51
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52 /// Records whether the value has been lowered from an f128.
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53 SmallVector<bool, 4> OriginalArgWasF128;
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54
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55 /// Records whether the value has been lowered from float.
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56 SmallVector<bool, 4> OriginalArgWasFloat;
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57
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58 /// Records whether the value was a fixed argument.
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59 /// See ISD::OutputArg::IsFixed,
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60 SmallVector<bool, 4> CallOperandIsFixed;
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61
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62 // Used to handle MIPS16-specific calling convention tweaks.
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63 // FIXME: This should probably be a fully fledged calling convention.
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64 SpecialCallingConvType SpecialCallingConv;
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65
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66 public:
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67 MipsCCState(CallingConv::ID CC, bool isVarArg, MachineFunction &MF,
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68 SmallVectorImpl<CCValAssign> &locs, LLVMContext &C,
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69 SpecialCallingConvType SpecialCC = NoSpecialCallingConv)
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70 : CCState(CC, isVarArg, MF, locs, C), SpecialCallingConv(SpecialCC) {}
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71
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72 void
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73 AnalyzeCallOperands(const SmallVectorImpl<ISD::OutputArg> &Outs,
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74 CCAssignFn Fn,
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75 std::vector<TargetLowering::ArgListEntry> &FuncArgs,
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76 const SDNode *CallNode) {
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77 PreAnalyzeCallOperands(Outs, FuncArgs, CallNode);
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78 CCState::AnalyzeCallOperands(Outs, Fn);
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79 OriginalArgWasF128.clear();
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80 OriginalArgWasFloat.clear();
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81 CallOperandIsFixed.clear();
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82 }
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83
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84 // The AnalyzeCallOperands in the base class is not usable since we must
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85 // provide a means of accessing ArgListEntry::IsFixed. Delete them from this
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86 // class. This doesn't stop them being used via the base class though.
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87 void AnalyzeCallOperands(const SmallVectorImpl<ISD::OutputArg> &Outs,
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88 CCAssignFn Fn) = delete;
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89 void AnalyzeCallOperands(const SmallVectorImpl<MVT> &Outs,
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90 SmallVectorImpl<ISD::ArgFlagsTy> &Flags,
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91 CCAssignFn Fn) = delete;
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92
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93 void AnalyzeFormalArguments(const SmallVectorImpl<ISD::InputArg> &Ins,
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94 CCAssignFn Fn) {
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95 PreAnalyzeFormalArgumentsForF128(Ins);
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96 CCState::AnalyzeFormalArguments(Ins, Fn);
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97 OriginalArgWasFloat.clear();
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98 OriginalArgWasF128.clear();
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99 }
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100
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101 void AnalyzeCallResult(const SmallVectorImpl<ISD::InputArg> &Ins,
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102 CCAssignFn Fn,
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103 const TargetLowering::CallLoweringInfo &CLI) {
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104 PreAnalyzeCallResultForF128(Ins, CLI);
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105 CCState::AnalyzeCallResult(Ins, Fn);
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106 OriginalArgWasFloat.clear();
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107 OriginalArgWasF128.clear();
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108 }
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109
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110 void AnalyzeReturn(const SmallVectorImpl<ISD::OutputArg> &Outs,
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111 CCAssignFn Fn) {
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112 PreAnalyzeReturnForF128(Outs);
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113 CCState::AnalyzeReturn(Outs, Fn);
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114 OriginalArgWasFloat.clear();
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115 OriginalArgWasF128.clear();
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116 }
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117
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118 bool CheckReturn(const SmallVectorImpl<ISD::OutputArg> &ArgsFlags,
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119 CCAssignFn Fn) {
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120 PreAnalyzeReturnForF128(ArgsFlags);
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121 bool Return = CCState::CheckReturn(ArgsFlags, Fn);
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122 OriginalArgWasFloat.clear();
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123 OriginalArgWasF128.clear();
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124 return Return;
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125 }
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126
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127 bool WasOriginalArgF128(unsigned ValNo) { return OriginalArgWasF128[ValNo]; }
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128 bool WasOriginalArgFloat(unsigned ValNo) {
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129 return OriginalArgWasFloat[ValNo];
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130 }
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131 bool IsCallOperandFixed(unsigned ValNo) { return CallOperandIsFixed[ValNo]; }
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132 SpecialCallingConvType getSpecialCallingConv() { return SpecialCallingConv; }
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133 };
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134 }
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135
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136 #endif
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