WebAssemblyISelLowering.h revision 344779 
1//- WebAssemblyISelLowering.h - WebAssembly DAG Lowering Interface -*- 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/// \file
11/// This file defines the interfaces that WebAssembly uses to lower LLVM
12/// code into a selection DAG.
13///
14//===----------------------------------------------------------------------===//
15
16#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYISELLOWERING_H
17#define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYISELLOWERING_H
18
19#include "llvm/CodeGen/TargetLowering.h"
20
21namespace llvm {
22
23namespace WebAssemblyISD {
24
25enum NodeType : unsigned {
26  FIRST_NUMBER = ISD::BUILTIN_OP_END,
27#define HANDLE_NODETYPE(NODE) NODE,
28#include "WebAssemblyISD.def"
29#undef HANDLE_NODETYPE
30};
31
32} // end namespace WebAssemblyISD
33
34class WebAssemblySubtarget;
35class WebAssemblyTargetMachine;
36
37class WebAssemblyTargetLowering final : public TargetLowering {
38public:
39  WebAssemblyTargetLowering(const TargetMachine &TM,
40                            const WebAssemblySubtarget &STI);
41
42private:
43  /// Keep a pointer to the WebAssemblySubtarget around so that we can make the
44  /// right decision when generating code for different targets.
45  const WebAssemblySubtarget *Subtarget;
46
47  AtomicExpansionKind shouldExpandAtomicRMWInIR(AtomicRMWInst *) const override;
48  FastISel *createFastISel(FunctionLoweringInfo &FuncInfo,
49                           const TargetLibraryInfo *LibInfo) const override;
50  bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const override;
51  MVT getScalarShiftAmountTy(const DataLayout &DL, EVT) const override;
52  MachineBasicBlock *
53  EmitInstrWithCustomInserter(MachineInstr &MI,
54                              MachineBasicBlock *MBB) const override;
55  const char *getTargetNodeName(unsigned Opcode) const override;
56  std::pair<unsigned, const TargetRegisterClass *>
57  getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
58                               StringRef Constraint, MVT VT) const override;
59  bool isCheapToSpeculateCttz() const override;
60  bool isCheapToSpeculateCtlz() const override;
61  bool isLegalAddressingMode(const DataLayout &DL, const AddrMode &AM, Type *Ty,
62                             unsigned AS,
63                             Instruction *I = nullptr) const override;
64  bool allowsMisalignedMemoryAccesses(EVT, unsigned AddrSpace, unsigned Align,
65                                      bool *Fast) const override;
66  bool isIntDivCheap(EVT VT, AttributeList Attr) const override;
67
68  EVT getSetCCResultType(const DataLayout &DL, LLVMContext &Context,
69                         EVT VT) const override;
70  bool getTgtMemIntrinsic(IntrinsicInfo &Info, const CallInst &I,
71                          MachineFunction &MF,
72                          unsigned Intrinsic) const override;
73
74  SDValue LowerCall(CallLoweringInfo &CLI,
75                    SmallVectorImpl<SDValue> &InVals) const override;
76  bool CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,
77                      bool isVarArg,
78                      const SmallVectorImpl<ISD::OutputArg> &Outs,
79                      LLVMContext &Context) const override;
80  SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
81                      const SmallVectorImpl<ISD::OutputArg> &Outs,
82                      const SmallVectorImpl<SDValue> &OutVals, const SDLoc &dl,
83                      SelectionDAG &DAG) const override;
84  SDValue LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv,
85                               bool IsVarArg,
86                               const SmallVectorImpl<ISD::InputArg> &Ins,
87                               const SDLoc &DL, SelectionDAG &DAG,
88                               SmallVectorImpl<SDValue> &InVals) const override;
89
90  // Custom lowering hooks.
91  SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
92  SDValue LowerFrameIndex(SDValue Op, SelectionDAG &DAG) const;
93  SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
94  SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
95  SDValue LowerExternalSymbol(SDValue Op, SelectionDAG &DAG) const;
96  SDValue LowerBR_JT(SDValue Op, SelectionDAG &DAG) const;
97  SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
98  SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
99  SDValue LowerCopyToReg(SDValue Op, SelectionDAG &DAG) const;
100  SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) const;
101  SDValue LowerINTRINSIC_VOID(SDValue Op, SelectionDAG &DAG) const;
102  SDValue LowerSIGN_EXTEND_INREG(SDValue Op, SelectionDAG &DAG) const;
103  SDValue LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) const;
104  SDValue LowerAccessVectorElement(SDValue Op, SelectionDAG &DAG) const;
105  SDValue LowerShift(SDValue Op, SelectionDAG &DAG) const;
106};
107
108namespace WebAssembly {
109FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
110                         const TargetLibraryInfo *libInfo);
111} // end namespace WebAssembly
112
113} // end namespace llvm
114
115#endif
116