1 //- WebAssemblyISelLowering.h - WebAssembly DAG Lowering Interface -*- C++ -*-//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
11 /// \brief This file defines the interfaces that WebAssembly uses to lower LLVM
12 /// code into a selection DAG.
14 //===----------------------------------------------------------------------===//
16 #ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYISELLOWERING_H
17 #define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYISELLOWERING_H
19 #include "llvm/Target/TargetLowering.h"
23 namespace WebAssemblyISD {
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
32 } // end namespace WebAssemblyISD
34 class WebAssemblySubtarget;
35 class WebAssemblyTargetMachine;
37 class WebAssemblyTargetLowering final : public TargetLowering {
39 WebAssemblyTargetLowering(const TargetMachine &TM,
40 const WebAssemblySubtarget &STI);
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;
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 *> getRegForInlineAsmConstraint(
53 const TargetRegisterInfo *TRI, StringRef Constraint,
54 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 bool allowsMisalignedMemoryAccesses(EVT, unsigned AddrSpace, unsigned Align,
60 bool *Fast) const override;
61 bool isIntDivCheap(EVT VT, AttributeSet Attr) const override;
63 SDValue LowerCall(CallLoweringInfo &CLI,
64 SmallVectorImpl<SDValue> &InVals) const override;
65 bool CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,
67 const SmallVectorImpl<ISD::OutputArg> &Outs,
68 LLVMContext &Context) const override;
69 SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
70 const SmallVectorImpl<ISD::OutputArg> &Outs,
71 const SmallVectorImpl<SDValue> &OutVals, const SDLoc &dl,
72 SelectionDAG &DAG) const override;
73 SDValue LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv,
75 const SmallVectorImpl<ISD::InputArg> &Ins,
76 const SDLoc &DL, SelectionDAG &DAG,
77 SmallVectorImpl<SDValue> &InVals) const override;
79 // Custom lowering hooks.
80 SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
81 SDValue LowerFrameIndex(SDValue Op, SelectionDAG &DAG) const;
82 SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
83 SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
84 SDValue LowerExternalSymbol(SDValue Op, SelectionDAG &DAG) const;
85 SDValue LowerBR_JT(SDValue Op, SelectionDAG &DAG) const;
86 SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
87 SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
88 SDValue LowerCopyToReg(SDValue Op, SelectionDAG &DAG) const;
91 namespace WebAssembly {
92 FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
93 const TargetLibraryInfo *libInfo);
94 } // end namespace WebAssembly
96 } // end namespace llvm