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/WebAssemblyMCTargetDesc.h" 17 #include "Utils/WebAssemblyTypeUtilities.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::emitFunctionType(const MCSymbolWasm *Sym) { 62 assert(Sym->isFunction()); 63 OS << "\t.functype\t" << Sym->getName() << " "; 64 OS << WebAssembly::signatureToString(Sym->getSignature()); 65 OS << "\n"; 66 } 67 68 void WebAssemblyTargetAsmStreamer::emitGlobalType(const MCSymbolWasm *Sym) { 69 assert(Sym->isGlobal()); 70 OS << "\t.globaltype\t" << Sym->getName() << ", " 71 << WebAssembly::typeToString( 72 static_cast<wasm::ValType>(Sym->getGlobalType().Type)); 73 if (!Sym->getGlobalType().Mutable) 74 OS << ", immutable"; 75 OS << '\n'; 76 } 77 78 void WebAssemblyTargetAsmStreamer::emitTableType(const MCSymbolWasm *Sym) { 79 assert(Sym->isTable()); 80 const wasm::WasmTableType &Type = Sym->getTableType(); 81 OS << "\t.tabletype\t" << Sym->getName() << ", " 82 << WebAssembly::typeToString(static_cast<wasm::ValType>(Type.ElemType)); 83 bool HasMaximum = Type.Limits.Flags & wasm::WASM_LIMITS_FLAG_HAS_MAX; 84 if (Type.Limits.Minimum != 0 || HasMaximum) { 85 OS << ", " << Type.Limits.Minimum; 86 if (HasMaximum) 87 OS << ", " << Type.Limits.Maximum; 88 } 89 OS << '\n'; 90 } 91 92 void WebAssemblyTargetAsmStreamer::emitTagType(const MCSymbolWasm *Sym) { 93 assert(Sym->isTag()); 94 OS << "\t.tagtype\t" << Sym->getName() << " "; 95 OS << WebAssembly::typeListToString(Sym->getSignature()->Params); 96 OS << "\n"; 97 } 98 99 void WebAssemblyTargetAsmStreamer::emitImportModule(const MCSymbolWasm *Sym, 100 StringRef ImportModule) { 101 OS << "\t.import_module\t" << Sym->getName() << ", " 102 << ImportModule << '\n'; 103 } 104 105 void WebAssemblyTargetAsmStreamer::emitImportName(const MCSymbolWasm *Sym, 106 StringRef ImportName) { 107 OS << "\t.import_name\t" << Sym->getName() << ", " 108 << ImportName << '\n'; 109 } 110 111 void WebAssemblyTargetAsmStreamer::emitExportName(const MCSymbolWasm *Sym, 112 StringRef ExportName) { 113 OS << "\t.export_name\t" << Sym->getName() << ", " 114 << ExportName << '\n'; 115 } 116 117 void WebAssemblyTargetAsmStreamer::emitIndIdx(const MCExpr *Value) { 118 OS << "\t.indidx \t" << *Value << '\n'; 119 } 120 121 void WebAssemblyTargetWasmStreamer::emitLocal(ArrayRef<wasm::ValType> Types) { 122 SmallVector<std::pair<wasm::ValType, uint32_t>, 4> Grouped; 123 for (auto Type : Types) { 124 if (Grouped.empty() || Grouped.back().first != Type) 125 Grouped.push_back(std::make_pair(Type, 1)); 126 else 127 ++Grouped.back().second; 128 } 129 130 Streamer.emitULEB128IntValue(Grouped.size()); 131 for (auto Pair : Grouped) { 132 Streamer.emitULEB128IntValue(Pair.second); 133 emitValueType(Pair.first); 134 } 135 } 136 137 void WebAssemblyTargetWasmStreamer::emitIndIdx(const MCExpr *Value) { 138 llvm_unreachable(".indidx encoding not yet implemented"); 139 } 140