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::emitFunctionType(const MCSymbolWasm *Sym) { 64 assert(Sym->isFunction()); 65 OS << "\t.functype\t" << Sym->getName() << " "; 66 OS << WebAssembly::signatureToString(Sym->getSignature()); 67 OS << "\n"; 68 } 69 70 void WebAssemblyTargetAsmStreamer::emitGlobalType(const MCSymbolWasm *Sym) { 71 assert(Sym->isGlobal()); 72 OS << "\t.globaltype\t" << Sym->getName() << ", " 73 << WebAssembly::typeToString( 74 static_cast<wasm::ValType>(Sym->getGlobalType().Type)) 75 << '\n'; 76 } 77 78 void WebAssemblyTargetAsmStreamer::emitEventType(const MCSymbolWasm *Sym) { 79 assert(Sym->isEvent()); 80 OS << "\t.eventtype\t" << Sym->getName() << " "; 81 OS << WebAssembly::typeListToString(Sym->getSignature()->Params); 82 OS << "\n"; 83 } 84 85 void WebAssemblyTargetAsmStreamer::emitImportModule(const MCSymbolWasm *Sym, 86 StringRef ImportModule) { 87 OS << "\t.import_module\t" << Sym->getName() << ", " 88 << ImportModule << '\n'; 89 } 90 91 void WebAssemblyTargetAsmStreamer::emitImportName(const MCSymbolWasm *Sym, 92 StringRef ImportName) { 93 OS << "\t.import_name\t" << Sym->getName() << ", " 94 << ImportName << '\n'; 95 } 96 97 void WebAssemblyTargetAsmStreamer::emitIndIdx(const MCExpr *Value) { 98 OS << "\t.indidx \t" << *Value << '\n'; 99 } 100 101 void WebAssemblyTargetWasmStreamer::emitLocal(ArrayRef<wasm::ValType> Types) { 102 SmallVector<std::pair<wasm::ValType, uint32_t>, 4> Grouped; 103 for (auto Type : Types) { 104 if (Grouped.empty() || Grouped.back().first != Type) 105 Grouped.push_back(std::make_pair(Type, 1)); 106 else 107 ++Grouped.back().second; 108 } 109 110 Streamer.EmitULEB128IntValue(Grouped.size()); 111 for (auto Pair : Grouped) { 112 Streamer.EmitULEB128IntValue(Pair.second); 113 emitValueType(Pair.first); 114 } 115 } 116 117 void WebAssemblyTargetWasmStreamer::emitEndFunc() { 118 llvm_unreachable(".end_func is not needed for direct wasm output"); 119 } 120 121 void WebAssemblyTargetWasmStreamer::emitIndIdx(const MCExpr *Value) { 122 llvm_unreachable(".indidx encoding not yet implemented"); 123 } 124