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