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      1 //=- WebAssemblySubtarget.h - Define Subtarget for the WebAssembly -*- C++ -*-//
      2 //
      3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
      4 // See https://llvm.org/LICENSE.txt for license information.
      5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
      6 //
      7 //===----------------------------------------------------------------------===//
      8 ///
      9 /// \file
     10 /// This file declares the WebAssembly-specific subclass of
     11 /// TargetSubtarget.
     12 ///
     13 //===----------------------------------------------------------------------===//
     14 
     15 #ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYSUBTARGET_H
     16 #define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYSUBTARGET_H
     17 
     18 #include "WebAssemblyFrameLowering.h"
     19 #include "WebAssemblyISelLowering.h"
     20 #include "WebAssemblyInstrInfo.h"
     21 #include "WebAssemblySelectionDAGInfo.h"
     22 #include "llvm/CodeGen/TargetSubtargetInfo.h"
     23 #include <string>
     24 
     25 #define GET_SUBTARGETINFO_ENUM
     26 #define GET_SUBTARGETINFO_HEADER
     27 #include "WebAssemblyGenSubtargetInfo.inc"
     28 
     29 namespace llvm {
     30 
     31 // Defined in WebAssemblyGenSubtargetInfo.inc.
     32 extern const SubtargetFeatureKV
     33     WebAssemblyFeatureKV[WebAssembly::NumSubtargetFeatures];
     34 
     35 class WebAssemblySubtarget final : public WebAssemblyGenSubtargetInfo {
     36   enum SIMDEnum {
     37     NoSIMD,
     38     SIMD128,
     39   } SIMDLevel = NoSIMD;
     40 
     41   bool HasAtomics = false;
     42   bool HasNontrappingFPToInt = false;
     43   bool HasSignExt = false;
     44   bool HasExceptionHandling = false;
     45   bool HasBulkMemory = false;
     46   bool HasMultivalue = false;
     47   bool HasMutableGlobals = false;
     48   bool HasTailCall = false;
     49   bool HasReferenceTypes = false;
     50 
     51   /// What processor and OS we're targeting.
     52   Triple TargetTriple;
     53 
     54   WebAssemblyFrameLowering FrameLowering;
     55   WebAssemblyInstrInfo InstrInfo;
     56   WebAssemblySelectionDAGInfo TSInfo;
     57   WebAssemblyTargetLowering TLInfo;
     58 
     59   WebAssemblySubtarget &initializeSubtargetDependencies(StringRef CPU,
     60                                                         StringRef FS);
     61 
     62 public:
     63   /// This constructor initializes the data members to match that
     64   /// of the specified triple.
     65   WebAssemblySubtarget(const Triple &TT, const std::string &CPU,
     66                        const std::string &FS, const TargetMachine &TM);
     67 
     68   const WebAssemblySelectionDAGInfo *getSelectionDAGInfo() const override {
     69     return &TSInfo;
     70   }
     71   const WebAssemblyFrameLowering *getFrameLowering() const override {
     72     return &FrameLowering;
     73   }
     74   const WebAssemblyTargetLowering *getTargetLowering() const override {
     75     return &TLInfo;
     76   }
     77   const WebAssemblyInstrInfo *getInstrInfo() const override {
     78     return &InstrInfo;
     79   }
     80   const WebAssemblyRegisterInfo *getRegisterInfo() const override {
     81     return &getInstrInfo()->getRegisterInfo();
     82   }
     83   const Triple &getTargetTriple() const { return TargetTriple; }
     84   bool enableAtomicExpand() const override;
     85   bool enableIndirectBrExpand() const override { return true; }
     86   bool enableMachineScheduler() const override;
     87   bool useAA() const override;
     88 
     89   // Predicates used by WebAssemblyInstrInfo.td.
     90   bool hasAddr64() const { return TargetTriple.isArch64Bit(); }
     91   bool hasSIMD128() const { return SIMDLevel >= SIMD128; }
     92   bool hasAtomics() const { return HasAtomics; }
     93   bool hasNontrappingFPToInt() const { return HasNontrappingFPToInt; }
     94   bool hasSignExt() const { return HasSignExt; }
     95   bool hasExceptionHandling() const { return HasExceptionHandling; }
     96   bool hasBulkMemory() const { return HasBulkMemory; }
     97   bool hasMultivalue() const { return HasMultivalue; }
     98   bool hasMutableGlobals() const { return HasMutableGlobals; }
     99   bool hasTailCall() const { return HasTailCall; }
    100   bool hasReferenceTypes() const { return HasReferenceTypes; }
    101 
    102   /// Parses features string setting specified subtarget options. Definition of
    103   /// function is auto generated by tblgen.
    104   void ParseSubtargetFeatures(StringRef CPU, StringRef TuneCPU, StringRef FS);
    105 };
    106 
    107 } // end namespace llvm
    108 
    109 #endif
    110