1 //==-- WebAssemblyTargetStreamer.cpp - WebAssembly Target Streamer Methods --=// 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 defines WebAssembly-specific target streamer classes. 11 /// These are for implementing support for target-specific assembly directives. 12 /// 13 //===----------------------------------------------------------------------===// 14 15 #include "MCTargetDesc/WebAssemblyTargetStreamer.h" 16 #include "MCTargetDesc/WebAssemblyInstPrinter.h" 17 #include "MCTargetDesc/WebAssemblyMCTargetDesc.h" 18 #include "llvm/MC/MCContext.h" 19 #include "llvm/MC/MCSectionWasm.h" 20 #include "llvm/MC/MCSubtargetInfo.h" 21 #include "llvm/MC/MCSymbolWasm.h" 22 #include "llvm/Support/Casting.h" 23 #include "llvm/Support/ErrorHandling.h" 24 #include "llvm/Support/FormattedStream.h" 25 using namespace llvm; 26 27 WebAssemblyTargetStreamer::WebAssemblyTargetStreamer(MCStreamer &S) 28 : MCTargetStreamer(S) {} 29 30 void WebAssemblyTargetStreamer::emitValueType(wasm::ValType Type) { 31 Streamer.EmitIntValue(uint8_t(Type), 1); 32 } 33 34 WebAssemblyTargetAsmStreamer::WebAssemblyTargetAsmStreamer( 35 MCStreamer &S, formatted_raw_ostream &OS) 36 : WebAssemblyTargetStreamer(S), OS(OS) {} 37 38 WebAssemblyTargetWasmStreamer::WebAssemblyTargetWasmStreamer(MCStreamer &S) 39 : WebAssemblyTargetStreamer(S) {} 40 41 static void printTypes(formatted_raw_ostream &OS, 42 ArrayRef<wasm::ValType> Types) { 43 bool First = true; 44 for (auto Type : Types) { 45 if (First) 46 First = false; 47 else 48 OS << ", "; 49 OS << WebAssembly::typeToString(Type); 50 } 51 OS << '\n'; 52 } 53 54 void WebAssemblyTargetAsmStreamer::emitLocal(ArrayRef<wasm::ValType> Types) { 55 if (!Types.empty()) { 56 OS << "\t.local \t"; 57 printTypes(OS, Types); 58 } 59 } 60 61 void WebAssemblyTargetAsmStreamer::emitEndFunc() { OS << "\t.endfunc\n"; } 62 63 void WebAssemblyTargetAsmStreamer::emitSignature( 64 const wasm::WasmSignature *Sig) { 65 OS << "("; 66 emitParamList(Sig); 67 OS << ") -> ("; 68 emitReturnList(Sig); 69 OS << ")"; 70 } 71 72 void WebAssemblyTargetAsmStreamer::emitParamList( 73 const wasm::WasmSignature *Sig) { 74 auto &Params = Sig->Params; 75 for (auto &Ty : Params) { 76 if (&Ty != &Params[0]) 77 OS << ", "; 78 OS << WebAssembly::typeToString(Ty); 79 } 80 } 81 82 void WebAssemblyTargetAsmStreamer::emitReturnList( 83 const wasm::WasmSignature *Sig) { 84 auto &Returns = Sig->Returns; 85 for (auto &Ty : Returns) { 86 if (&Ty != &Returns[0]) 87 OS << ", "; 88 OS << WebAssembly::typeToString(Ty); 89 } 90 } 91 92 void WebAssemblyTargetAsmStreamer::emitFunctionType(const MCSymbolWasm *Sym) { 93 assert(Sym->isFunction()); 94 OS << "\t.functype\t" << Sym->getName() << " "; 95 emitSignature(Sym->getSignature()); 96 OS << "\n"; 97 } 98 99 void WebAssemblyTargetAsmStreamer::emitGlobalType(const MCSymbolWasm *Sym) { 100 assert(Sym->isGlobal()); 101 OS << "\t.globaltype\t" << Sym->getName() << ", " 102 << WebAssembly::typeToString( 103 static_cast<wasm::ValType>(Sym->getGlobalType().Type)) 104 << '\n'; 105 } 106 107 void WebAssemblyTargetAsmStreamer::emitEventType(const MCSymbolWasm *Sym) { 108 assert(Sym->isEvent()); 109 OS << "\t.eventtype\t" << Sym->getName() << " "; 110 emitParamList(Sym->getSignature()); 111 OS << "\n"; 112 } 113 114 void WebAssemblyTargetAsmStreamer::emitImportModule(const MCSymbolWasm *Sym, 115 StringRef ImportModule) { 116 OS << "\t.import_module\t" << Sym->getName() << ", " 117 << ImportModule << '\n'; 118 } 119 120 void WebAssemblyTargetAsmStreamer::emitImportName(const MCSymbolWasm *Sym, 121 StringRef ImportName) { 122 OS << "\t.import_name\t" << Sym->getName() << ", " 123 << ImportName << '\n'; 124 } 125 126 void WebAssemblyTargetAsmStreamer::emitIndIdx(const MCExpr *Value) { 127 OS << "\t.indidx \t" << *Value << '\n'; 128 } 129 130 void WebAssemblyTargetWasmStreamer::emitLocal(ArrayRef<wasm::ValType> Types) { 131 SmallVector<std::pair<wasm::ValType, uint32_t>, 4> Grouped; 132 for (auto Type : Types) { 133 if (Grouped.empty() || Grouped.back().first != Type) 134 Grouped.push_back(std::make_pair(Type, 1)); 135 else 136 ++Grouped.back().second; 137 } 138 139 Streamer.EmitULEB128IntValue(Grouped.size()); 140 for (auto Pair : Grouped) { 141 Streamer.EmitULEB128IntValue(Pair.second); 142 emitValueType(Pair.first); 143 } 144 } 145 146 void WebAssemblyTargetWasmStreamer::emitEndFunc() { 147 llvm_unreachable(".end_func is not needed for direct wasm output"); 148 } 149 150 void WebAssemblyTargetWasmStreamer::emitIndIdx(const MCExpr *Value) { 151 llvm_unreachable(".indidx encoding not yet implemented"); 152 } 153