1 //===---- MipsCCState.h - CCState with Mips specific extensions -----------===//
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 MIPSCCSTATE_H
11 #define MIPSCCSTATE_H
12 
13 #include "llvm/ADT/SmallVector.h"
14 #include "llvm/CodeGen/CallingConvLower.h"
15 #include "MipsISelLowering.h"
16 
17 namespace llvm {
18 class SDNode;
19 class MipsSubtarget;
20 
21 class MipsCCState : public CCState {
22 public:
23   enum SpecialCallingConvType { Mips16RetHelperConv, NoSpecialCallingConv };
24 
25   /// Determine the SpecialCallingConvType for the given callee
26   static SpecialCallingConvType
27   getSpecialCallingConvForCallee(const SDNode *Callee,
28                                  const MipsSubtarget &Subtarget);
29 
30 private:
31   /// Identify lowered values that originated from f128 arguments and record
32   /// this for use by RetCC_MipsN.
33   void PreAnalyzeCallResultForF128(const SmallVectorImpl<ISD::InputArg> &Ins,
34                                    const TargetLowering::CallLoweringInfo &CLI);
35 
36   /// Identify lowered values that originated from f128 arguments and record
37   /// this for use by RetCC_MipsN.
38   void PreAnalyzeReturnForF128(const SmallVectorImpl<ISD::OutputArg> &Outs);
39 
40   /// Identify lowered values that originated from f128 arguments and record
41   /// this.
42   void
43   PreAnalyzeCallOperands(const SmallVectorImpl<ISD::OutputArg> &Outs,
44                          std::vector<TargetLowering::ArgListEntry> &FuncArgs,
45                          const SDNode *CallNode);
46 
47   /// Identify lowered values that originated from f128 arguments and record
48   /// this.
49   void
50   PreAnalyzeFormalArgumentsForF128(const SmallVectorImpl<ISD::InputArg> &Ins);
51 
52   /// Records whether the value has been lowered from an f128.
53   SmallVector<bool, 4> OriginalArgWasF128;
54 
55   /// Records whether the value has been lowered from float.
56   SmallVector<bool, 4> OriginalArgWasFloat;
57 
58   /// Records whether the value was a fixed argument.
59   /// See ISD::OutputArg::IsFixed,
60   SmallVector<bool, 4> CallOperandIsFixed;
61 
62   // Used to handle MIPS16-specific calling convention tweaks.
63   // FIXME: This should probably be a fully fledged calling convention.
64   SpecialCallingConvType SpecialCallingConv;
65 
66 public:
67   MipsCCState(CallingConv::ID CC, bool isVarArg, MachineFunction &MF,
68               const TargetMachine &TM, SmallVectorImpl<CCValAssign> &locs,
69               LLVMContext &C,
70               SpecialCallingConvType SpecialCC = NoSpecialCallingConv)
71       : CCState(CC, isVarArg, MF, TM, locs, C), SpecialCallingConv(SpecialCC) {}
72 
73   void
74   AnalyzeCallOperands(const SmallVectorImpl<ISD::OutputArg> &Outs,
75                       CCAssignFn Fn,
76                       std::vector<TargetLowering::ArgListEntry> &FuncArgs,
77                       const SDNode *CallNode) {
78     PreAnalyzeCallOperands(Outs, FuncArgs, CallNode);
79     CCState::AnalyzeCallOperands(Outs, Fn);
80     OriginalArgWasF128.clear();
81     OriginalArgWasFloat.clear();
82     CallOperandIsFixed.clear();
83   }
84 
85   // The AnalyzeCallOperands in the base class is not usable since we must
86   // provide a means of accessing ArgListEntry::IsFixed. Delete them from this
87   // class. This doesn't stop them being used via the base class though.
88   void AnalyzeCallOperands(const SmallVectorImpl<ISD::OutputArg> &Outs,
89                            CCAssignFn Fn) LLVM_DELETED_FUNCTION;
90   void AnalyzeCallOperands(const SmallVectorImpl<MVT> &Outs,
91                            SmallVectorImpl<ISD::ArgFlagsTy> &Flags,
92                            CCAssignFn Fn) LLVM_DELETED_FUNCTION;
93 
94   void AnalyzeFormalArguments(const SmallVectorImpl<ISD::InputArg> &Ins,
95                               CCAssignFn Fn) {
96     PreAnalyzeFormalArgumentsForF128(Ins);
97     CCState::AnalyzeFormalArguments(Ins, Fn);
98     OriginalArgWasFloat.clear();
99     OriginalArgWasF128.clear();
100   }
101 
102   void AnalyzeCallResult(const SmallVectorImpl<ISD::InputArg> &Ins,
103                          CCAssignFn Fn,
104                          const TargetLowering::CallLoweringInfo &CLI) {
105     PreAnalyzeCallResultForF128(Ins, CLI);
106     CCState::AnalyzeCallResult(Ins, Fn);
107     OriginalArgWasFloat.clear();
108     OriginalArgWasF128.clear();
109   }
110 
111   void AnalyzeReturn(const SmallVectorImpl<ISD::OutputArg> &Outs,
112                      CCAssignFn Fn) {
113     PreAnalyzeReturnForF128(Outs);
114     CCState::AnalyzeReturn(Outs, Fn);
115     OriginalArgWasFloat.clear();
116     OriginalArgWasF128.clear();
117   }
118 
119   bool CheckReturn(const SmallVectorImpl<ISD::OutputArg> &ArgsFlags,
120                    CCAssignFn Fn) {
121     PreAnalyzeReturnForF128(ArgsFlags);
122     bool Return = CCState::CheckReturn(ArgsFlags, Fn);
123     OriginalArgWasFloat.clear();
124     OriginalArgWasF128.clear();
125     return Return;
126   }
127 
128   bool WasOriginalArgF128(unsigned ValNo) { return OriginalArgWasF128[ValNo]; }
129   bool WasOriginalArgFloat(unsigned ValNo) {
130       return OriginalArgWasFloat[ValNo];
131   }
132   bool IsCallOperandFixed(unsigned ValNo) { return CallOperandIsFixed[ValNo]; }
133   SpecialCallingConvType getSpecialCallingConv() { return SpecialCallingConv; }
134 };
135 }
136 
137 #endif
138