1 //==-- WebAssemblyTargetStreamer.h - WebAssembly Target Streamer -*- 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 WebAssembly-specific target streamer classes.
11 /// These are for implementing support for target-specific assembly directives.
12 ///
13 //===----------------------------------------------------------------------===//
14 
15 #ifndef LLVM_LIB_TARGET_WEBASSEMBLY_MCTARGETDESC_WEBASSEMBLYTARGETSTREAMER_H
16 #define LLVM_LIB_TARGET_WEBASSEMBLY_MCTARGETDESC_WEBASSEMBLYTARGETSTREAMER_H
17 
18 #include "llvm/BinaryFormat/Wasm.h"
19 #include "llvm/CodeGenTypes/MachineValueType.h"
20 #include "llvm/MC/MCStreamer.h"
21 
22 namespace llvm {
23 
24 class MCSymbolWasm;
25 class formatted_raw_ostream;
26 
27 /// WebAssembly-specific streamer interface, to implement support
28 /// WebAssembly-specific assembly directives.
29 class WebAssemblyTargetStreamer : public MCTargetStreamer {
30 public:
31   explicit WebAssemblyTargetStreamer(MCStreamer &S);
32 
33   /// .local
34   virtual void emitLocal(ArrayRef<wasm::ValType> Types) = 0;
35   /// .functype
36   virtual void emitFunctionType(const MCSymbolWasm *Sym) = 0;
37   /// .indidx
38   virtual void emitIndIdx(const MCExpr *Value) = 0;
39   /// .globaltype
40   virtual void emitGlobalType(const MCSymbolWasm *Sym) = 0;
41   /// .tabletype
42   virtual void emitTableType(const MCSymbolWasm *Sym) = 0;
43   /// .tagtype
44   virtual void emitTagType(const MCSymbolWasm *Sym) = 0;
45   /// .import_module
46   virtual void emitImportModule(const MCSymbolWasm *Sym,
47                                 StringRef ImportModule) = 0;
48   /// .import_name
49   virtual void emitImportName(const MCSymbolWasm *Sym,
50                               StringRef ImportName) = 0;
51   /// .export_name
52   virtual void emitExportName(const MCSymbolWasm *Sym,
53                               StringRef ExportName) = 0;
54 
55 protected:
56   void emitValueType(wasm::ValType Type);
57 };
58 
59 /// This part is for ascii assembly output
60 class WebAssemblyTargetAsmStreamer final : public WebAssemblyTargetStreamer {
61   formatted_raw_ostream &OS;
62 
63 public:
64   WebAssemblyTargetAsmStreamer(MCStreamer &S, formatted_raw_ostream &OS);
65 
66   void emitLocal(ArrayRef<wasm::ValType> Types) override;
67   void emitFunctionType(const MCSymbolWasm *Sym) override;
68   void emitIndIdx(const MCExpr *Value) override;
69   void emitGlobalType(const MCSymbolWasm *Sym) override;
70   void emitTableType(const MCSymbolWasm *Sym) override;
71   void emitTagType(const MCSymbolWasm *Sym) override;
72   void emitImportModule(const MCSymbolWasm *Sym, StringRef ImportModule) override;
73   void emitImportName(const MCSymbolWasm *Sym, StringRef ImportName) override;
74   void emitExportName(const MCSymbolWasm *Sym, StringRef ExportName) 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;
emitFunctionType(const MCSymbolWasm * Sym)83   void emitFunctionType(const MCSymbolWasm *Sym) override {}
84   void emitIndIdx(const MCExpr *Value) override;
emitGlobalType(const MCSymbolWasm * Sym)85   void emitGlobalType(const MCSymbolWasm *Sym) override {}
emitTableType(const MCSymbolWasm * Sym)86   void emitTableType(const MCSymbolWasm *Sym) override {}
emitTagType(const MCSymbolWasm * Sym)87   void emitTagType(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 {}
emitExportName(const MCSymbolWasm * Sym,StringRef ExportName)92   void emitExportName(const MCSymbolWasm *Sym,
93                       StringRef ExportName) override {}
94 };
95 
96 /// This part is for null output
97 class WebAssemblyTargetNullStreamer final : public WebAssemblyTargetStreamer {
98 public:
WebAssemblyTargetNullStreamer(MCStreamer & S)99   explicit WebAssemblyTargetNullStreamer(MCStreamer &S)
100       : WebAssemblyTargetStreamer(S) {}
101 
emitLocal(ArrayRef<wasm::ValType>)102   void emitLocal(ArrayRef<wasm::ValType>) override {}
emitFunctionType(const MCSymbolWasm *)103   void emitFunctionType(const MCSymbolWasm *) override {}
emitIndIdx(const MCExpr *)104   void emitIndIdx(const MCExpr *) override {}
emitGlobalType(const MCSymbolWasm *)105   void emitGlobalType(const MCSymbolWasm *) override {}
emitTableType(const MCSymbolWasm *)106   void emitTableType(const MCSymbolWasm *) override {}
emitTagType(const MCSymbolWasm *)107   void emitTagType(const MCSymbolWasm *) override {}
emitImportModule(const MCSymbolWasm *,StringRef)108   void emitImportModule(const MCSymbolWasm *, StringRef) override {}
emitImportName(const MCSymbolWasm *,StringRef)109   void emitImportName(const MCSymbolWasm *, StringRef) override {}
emitExportName(const MCSymbolWasm *,StringRef)110   void emitExportName(const MCSymbolWasm *, StringRef) override {}
111 };
112 
113 } // end namespace llvm
114 
115 #endif
116