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 /// \brief 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/Target/TargetLowering.h" 20 21 namespace llvm { 22 23 namespace WebAssemblyISD { 24 25 enum 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 34 class WebAssemblySubtarget; 35 class WebAssemblyTargetMachine; 36 37 class WebAssemblyTargetLowering final : public TargetLowering { 38 public: 39 WebAssemblyTargetLowering(const TargetMachine &TM, 40 const WebAssemblySubtarget &STI); 41 42 private: 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 FastISel *createFastISel(FunctionLoweringInfo &FuncInfo, 48 const TargetLibraryInfo *LibInfo) const override; 49 bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const override; 50 MVT getScalarShiftAmountTy(const DataLayout &DL, EVT) const override; 51 const char *getTargetNodeName(unsigned Opcode) const override; 52 std::pair<unsigned, const TargetRegisterClass *> 53 getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI, 54 StringRef Constraint, MVT VT) const override; 55 bool isCheapToSpeculateCttz() const override; 56 bool isCheapToSpeculateCtlz() const override; 57 bool isLegalAddressingMode(const DataLayout &DL, const AddrMode &AM, Type *Ty, 58 unsigned AS) const override; 59 60 SDValue LowerCall(CallLoweringInfo &CLI, 61 SmallVectorImpl<SDValue> &InVals) const override; 62 bool CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF, 63 bool isVarArg, 64 const SmallVectorImpl<ISD::OutputArg> &Outs, 65 LLVMContext &Context) const override; 66 SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool isVarArg, 67 const SmallVectorImpl<ISD::OutputArg> &Outs, 68 const SmallVectorImpl<SDValue> &OutVals, SDLoc dl, 69 SelectionDAG &DAG) const override; 70 SDValue LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv, 71 bool IsVarArg, 72 const SmallVectorImpl<ISD::InputArg> &Ins, 73 SDLoc DL, SelectionDAG &DAG, 74 SmallVectorImpl<SDValue> &InVals) const override; 75 76 // Custom lowering hooks. 77 SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override; 78 SDValue LowerFrameIndex(SDValue Op, SelectionDAG &DAG) const; 79 SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const; 80 SDValue LowerExternalSymbol(SDValue Op, SelectionDAG &DAG) const; 81 SDValue LowerBR_JT(SDValue Op, SelectionDAG &DAG) const; 82 SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const; 83 SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const; 84 }; 85 86 namespace WebAssembly { 87 FastISel *createFastISel(FunctionLoweringInfo &funcInfo, 88 const TargetLibraryInfo *libInfo); 89 } // end namespace WebAssembly 90 91 } // end namespace llvm 92 93 #endif 94
