1 //==-- WebAssemblyTargetStreamer.h - WebAssembly Target Streamer -*- 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 WebAssembly-specific target streamer classes.
12 /// These are for implementing support for target-specific assembly directives.
13 ///
14 //===----------------------------------------------------------------------===//
15 
16 #ifndef LLVM_LIB_TARGET_WEBASSEMBLY_MCTARGETDESC_WEBASSEMBLYTARGETSTREAMER_H
17 #define LLVM_LIB_TARGET_WEBASSEMBLY_MCTARGETDESC_WEBASSEMBLYTARGETSTREAMER_H
18 
19 #include "llvm/BinaryFormat/Wasm.h"
20 #include "llvm/MC/MCStreamer.h"
21 #include "llvm/Support/MachineValueType.h"
22 
23 namespace llvm {
24 
25 class MCWasmStreamer;
26 class MCSymbolWasm;
27 
28 /// WebAssembly-specific streamer interface, to implement support
29 /// WebAssembly-specific assembly directives.
30 class WebAssemblyTargetStreamer : public MCTargetStreamer {
31 public:
32   explicit WebAssemblyTargetStreamer(MCStreamer &S);
33 
34   /// .local
35   virtual void emitLocal(ArrayRef<wasm::ValType> Types) = 0;
36   /// .endfunc
37   virtual void emitEndFunc() = 0;
38   /// .functype
39   virtual void emitFunctionType(const MCSymbolWasm *Sym) = 0;
40   /// .indidx
41   virtual void emitIndIdx(const MCExpr *Value) = 0;
42   /// .globaltype
43   virtual void emitGlobalType(const MCSymbolWasm *Sym) = 0;
44   /// .eventtype
45   virtual void emitEventType(const MCSymbolWasm *Sym) = 0;
46   /// .import_module
47   virtual void emitImportModule(const MCSymbolWasm *Sym,
48                                 StringRef ImportModule) = 0;
49   /// .import_name
50   virtual void emitImportName(const MCSymbolWasm *Sym,
51                               StringRef ImportName) = 0;
52 
53 protected:
54   void emitValueType(wasm::ValType Type);
55 };
56 
57 /// This part is for ascii assembly output
58 class WebAssemblyTargetAsmStreamer final : public WebAssemblyTargetStreamer {
59   formatted_raw_ostream &OS;
60   void emitSignature(const wasm::WasmSignature *Sig);
61   void emitParamList(const wasm::WasmSignature *Sig);
62   void emitReturnList(const wasm::WasmSignature *Sig);
63 
64 public:
65   WebAssemblyTargetAsmStreamer(MCStreamer &S, formatted_raw_ostream &OS);
66 
67   void emitLocal(ArrayRef<wasm::ValType> Types) override;
68   void emitEndFunc() override;
69   void emitFunctionType(const MCSymbolWasm *Sym) override;
70   void emitIndIdx(const MCExpr *Value) override;
71   void emitGlobalType(const MCSymbolWasm *Sym) override;
72   void emitEventType(const MCSymbolWasm *Sym) override;
73   void emitImportModule(const MCSymbolWasm *Sym, StringRef ImportModule) override;
74   void emitImportName(const MCSymbolWasm *Sym, StringRef ImportName) override;
75 };
76 
77 /// This part is for Wasm object output
78 class WebAssemblyTargetWasmStreamer final : public WebAssemblyTargetStreamer {
79 public:
80   explicit WebAssemblyTargetWasmStreamer(MCStreamer &S);
81 
82   void emitLocal(ArrayRef<wasm::ValType> Types) override;
83   void emitEndFunc() override;
emitFunctionType(const MCSymbolWasm * Sym)84   void emitFunctionType(const MCSymbolWasm *Sym) override {}
85   void emitIndIdx(const MCExpr *Value) override;
emitGlobalType(const MCSymbolWasm * Sym)86   void emitGlobalType(const MCSymbolWasm *Sym) override {}
emitEventType(const MCSymbolWasm * Sym)87   void emitEventType(const MCSymbolWasm *Sym) override {}
emitImportModule(const MCSymbolWasm * Sym,StringRef ImportModule)88   void emitImportModule(const MCSymbolWasm *Sym,
89                         StringRef ImportModule) override {}
emitImportName(const MCSymbolWasm * Sym,StringRef ImportName)90   void emitImportName(const MCSymbolWasm *Sym,
91                       StringRef ImportName) override {}
92 };
93 
94 /// This part is for null output
95 class WebAssemblyTargetNullStreamer final : public WebAssemblyTargetStreamer {
96 public:
WebAssemblyTargetNullStreamer(MCStreamer & S)97   explicit WebAssemblyTargetNullStreamer(MCStreamer &S)
98       : WebAssemblyTargetStreamer(S) {}
99 
emitLocal(ArrayRef<wasm::ValType>)100   void emitLocal(ArrayRef<wasm::ValType>) override {}
emitEndFunc()101   void emitEndFunc() override {}
emitFunctionType(const MCSymbolWasm *)102   void emitFunctionType(const MCSymbolWasm *) override {}
emitIndIdx(const MCExpr *)103   void emitIndIdx(const MCExpr *) override {}
emitGlobalType(const MCSymbolWasm *)104   void emitGlobalType(const MCSymbolWasm *) override {}
emitEventType(const MCSymbolWasm *)105   void emitEventType(const MCSymbolWasm *) override {}
emitImportModule(const MCSymbolWasm *,StringRef)106   void emitImportModule(const MCSymbolWasm *, StringRef) override {}
emitImportName(const MCSymbolWasm *,StringRef)107   void emitImportName(const MCSymbolWasm *, StringRef) override {}
108 };
109 
110 } // end namespace llvm
111 
112 #endif
113