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     UnimplementedSIMD128,
40   } SIMDLevel = NoSIMD;
41 
42   bool HasAtomics = false;
43   bool HasNontrappingFPToInt = false;
44   bool HasSignExt = false;
45   bool HasExceptionHandling = false;
46   bool HasBulkMemory = false;
47   bool HasMultivalue = false;
48   bool HasMutableGlobals = false;
49   bool HasTailCall = false;
50   bool HasReferenceTypes = false;
51 
52   /// String name of used CPU.
53   std::string CPUString;
54 
55   /// What processor and OS we're targeting.
56   Triple TargetTriple;
57 
58   WebAssemblyFrameLowering FrameLowering;
59   WebAssemblyInstrInfo InstrInfo;
60   WebAssemblySelectionDAGInfo TSInfo;
61   WebAssemblyTargetLowering TLInfo;
62 
63   /// Initializes using CPUString and the passed in feature string so that we
64   /// can use initializer lists for subtarget initialization.
65   WebAssemblySubtarget &initializeSubtargetDependencies(StringRef FS);
66 
67 public:
68   /// This constructor initializes the data members to match that
69   /// of the specified triple.
70   WebAssemblySubtarget(const Triple &TT, const std::string &CPU,
71                        const std::string &FS, const TargetMachine &TM);
72 
73   const WebAssemblySelectionDAGInfo *getSelectionDAGInfo() const override {
74     return &TSInfo;
75   }
76   const WebAssemblyFrameLowering *getFrameLowering() const override {
77     return &FrameLowering;
78   }
79   const WebAssemblyTargetLowering *getTargetLowering() const override {
80     return &TLInfo;
81   }
82   const WebAssemblyInstrInfo *getInstrInfo() const override {
83     return &InstrInfo;
84   }
85   const WebAssemblyRegisterInfo *getRegisterInfo() const override {
86     return &getInstrInfo()->getRegisterInfo();
87   }
88   const Triple &getTargetTriple() const { return TargetTriple; }
89   bool enableAtomicExpand() const override;
90   bool enableIndirectBrExpand() const override { return true; }
91   bool enableMachineScheduler() const override;
92   bool useAA() const override;
93 
94   // Predicates used by WebAssemblyInstrInfo.td.
95   bool hasAddr64() const { return TargetTriple.isArch64Bit(); }
96   bool hasSIMD128() const { return SIMDLevel >= SIMD128; }
97   bool hasUnimplementedSIMD128() const {
98     return SIMDLevel >= UnimplementedSIMD128;
99   }
100   bool hasAtomics() const { return HasAtomics; }
101   bool hasNontrappingFPToInt() const { return HasNontrappingFPToInt; }
102   bool hasSignExt() const { return HasSignExt; }
103   bool hasExceptionHandling() const { return HasExceptionHandling; }
104   bool hasBulkMemory() const { return HasBulkMemory; }
105   bool hasMultivalue() const { return HasMultivalue; }
106   bool hasMutableGlobals() const { return HasMutableGlobals; }
107   bool hasTailCall() const { return HasTailCall; }
108   bool hasReferenceTypes() const { return HasReferenceTypes; }
109 
110   /// Parses features string setting specified subtarget options. Definition of
111   /// function is auto generated by tblgen.
112   void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
113 };
114 
115 } // end namespace llvm
116 
117 #endif
118