1 //=- WebAssemblySubtarget.h - Define Subtarget for the WebAssembly -*- 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 declares the WebAssembly-specific subclass of
12 /// TargetSubtarget.
13 ///
14 //===----------------------------------------------------------------------===//
15 
16 #ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYSUBTARGET_H
17 #define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYSUBTARGET_H
18 
19 #include "WebAssemblyFrameLowering.h"
20 #include "WebAssemblyISelLowering.h"
21 #include "WebAssemblyInstrInfo.h"
22 #include "WebAssemblySelectionDAGInfo.h"
23 #include "llvm/CodeGen/TargetSubtargetInfo.h"
24 #include <string>
25 
26 #define GET_SUBTARGETINFO_HEADER
27 #include "WebAssemblyGenSubtargetInfo.inc"
28 
29 namespace llvm {
30 
31 class WebAssemblySubtarget final : public WebAssemblyGenSubtargetInfo {
32   enum SIMDEnum {
33     NoSIMD,
34     SIMD128,
35     UnimplementedSIMD128,
36   } SIMDLevel = NoSIMD;
37 
38   bool HasAtomics = false;
39   bool HasNontrappingFPToInt = false;
40   bool HasSignExt = false;
41   bool HasExceptionHandling = false;
42 
43   /// String name of used CPU.
44   std::string CPUString;
45 
46   /// What processor and OS we're targeting.
47   Triple TargetTriple;
48 
49   WebAssemblyFrameLowering FrameLowering;
50   WebAssemblyInstrInfo InstrInfo;
51   WebAssemblySelectionDAGInfo TSInfo;
52   WebAssemblyTargetLowering TLInfo;
53 
54   /// Initializes using CPUString and the passed in feature string so that we
55   /// can use initializer lists for subtarget initialization.
56   WebAssemblySubtarget &initializeSubtargetDependencies(StringRef FS);
57 
58 public:
59   /// This constructor initializes the data members to match that
60   /// of the specified triple.
61   WebAssemblySubtarget(const Triple &TT, const std::string &CPU,
62                        const std::string &FS, const TargetMachine &TM);
63 
getSelectionDAGInfo()64   const WebAssemblySelectionDAGInfo *getSelectionDAGInfo() const override {
65     return &TSInfo;
66   }
getFrameLowering()67   const WebAssemblyFrameLowering *getFrameLowering() const override {
68     return &FrameLowering;
69   }
getTargetLowering()70   const WebAssemblyTargetLowering *getTargetLowering() const override {
71     return &TLInfo;
72   }
getInstrInfo()73   const WebAssemblyInstrInfo *getInstrInfo() const override {
74     return &InstrInfo;
75   }
getRegisterInfo()76   const WebAssemblyRegisterInfo *getRegisterInfo() const override {
77     return &getInstrInfo()->getRegisterInfo();
78   }
getTargetTriple()79   const Triple &getTargetTriple() const { return TargetTriple; }
80   bool enableMachineScheduler() const override;
81   bool useAA() const override;
82 
83   // Predicates used by WebAssemblyInstrInfo.td.
hasAddr64()84   bool hasAddr64() const { return TargetTriple.isArch64Bit(); }
hasSIMD128()85   bool hasSIMD128() const { return SIMDLevel >= SIMD128; }
hasUnimplementedSIMD128()86   bool hasUnimplementedSIMD128() const {
87     return SIMDLevel >= UnimplementedSIMD128;
88   }
hasAtomics()89   bool hasAtomics() const { return HasAtomics; }
hasNontrappingFPToInt()90   bool hasNontrappingFPToInt() const { return HasNontrappingFPToInt; }
hasSignExt()91   bool hasSignExt() const { return HasSignExt; }
hasExceptionHandling()92   bool hasExceptionHandling() const { return HasExceptionHandling; }
93 
94   /// Parses features string setting specified subtarget options. Definition of
95   /// function is auto generated by tblgen.
96   void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
97 };
98 
99 } // end namespace llvm
100 
101 #endif
102