1 //===--- WebAssembly.cpp - Implement WebAssembly target feature support ---===// 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 // This file implements WebAssembly TargetInfo objects. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "WebAssembly.h" 14 #include "Targets.h" 15 #include "clang/Basic/Builtins.h" 16 #include "clang/Basic/Diagnostic.h" 17 #include "clang/Basic/TargetBuiltins.h" 18 #include "llvm/ADT/StringSwitch.h" 19 20 using namespace clang; 21 using namespace clang::targets; 22 23 static constexpr Builtin::Info BuiltinInfo[] = { 24 #define BUILTIN(ID, TYPE, ATTRS) \ 25 {#ID, TYPE, ATTRS, nullptr, HeaderDesc::NO_HEADER, ALL_LANGUAGES}, 26 #define TARGET_BUILTIN(ID, TYPE, ATTRS, FEATURE) \ 27 {#ID, TYPE, ATTRS, FEATURE, HeaderDesc::NO_HEADER, ALL_LANGUAGES}, 28 #define LIBBUILTIN(ID, TYPE, ATTRS, HEADER) \ 29 {#ID, TYPE, ATTRS, nullptr, HeaderDesc::HEADER, ALL_LANGUAGES}, 30 #include "clang/Basic/BuiltinsWebAssembly.def" 31 }; 32 33 static constexpr llvm::StringLiteral ValidCPUNames[] = { 34 {"mvp"}, {"bleeding-edge"}, {"generic"}}; 35 36 StringRef WebAssemblyTargetInfo::getABI() const { return ABI; } 37 38 bool WebAssemblyTargetInfo::setABI(const std::string &Name) { 39 if (Name != "mvp" && Name != "experimental-mv") 40 return false; 41 42 ABI = Name; 43 return true; 44 } 45 46 bool WebAssemblyTargetInfo::hasFeature(StringRef Feature) const { 47 return llvm::StringSwitch<bool>(Feature) 48 .Case("atomics", HasAtomics) 49 .Case("bulk-memory", HasBulkMemory) 50 .Case("bulk-memory-opt", HasBulkMemoryOpt) 51 .Case("call-indirect-overlong", HasCallIndirectOverlong) 52 .Case("exception-handling", HasExceptionHandling) 53 .Case("extended-const", HasExtendedConst) 54 .Case("fp16", HasFP16) 55 .Case("multimemory", HasMultiMemory) 56 .Case("multivalue", HasMultivalue) 57 .Case("mutable-globals", HasMutableGlobals) 58 .Case("nontrapping-fptoint", HasNontrappingFPToInt) 59 .Case("reference-types", HasReferenceTypes) 60 .Case("relaxed-simd", SIMDLevel >= RelaxedSIMD) 61 .Case("sign-ext", HasSignExt) 62 .Case("simd128", SIMDLevel >= SIMD128) 63 .Case("tail-call", HasTailCall) 64 .Case("wide-arithmetic", HasWideArithmetic) 65 .Default(false); 66 } 67 68 bool WebAssemblyTargetInfo::isValidCPUName(StringRef Name) const { 69 return llvm::is_contained(ValidCPUNames, Name); 70 } 71 72 void WebAssemblyTargetInfo::fillValidCPUList( 73 SmallVectorImpl<StringRef> &Values) const { 74 Values.append(std::begin(ValidCPUNames), std::end(ValidCPUNames)); 75 } 76 77 void WebAssemblyTargetInfo::getTargetDefines(const LangOptions &Opts, 78 MacroBuilder &Builder) const { 79 defineCPUMacros(Builder, "wasm", /*Tuning=*/false); 80 if (HasAtomics) 81 Builder.defineMacro("__wasm_atomics__"); 82 if (HasBulkMemory) 83 Builder.defineMacro("__wasm_bulk_memory__"); 84 if (HasBulkMemoryOpt) 85 Builder.defineMacro("__wasm_bulk_memory_opt__"); 86 if (HasExceptionHandling) 87 Builder.defineMacro("__wasm_exception_handling__"); 88 if (HasExtendedConst) 89 Builder.defineMacro("__wasm_extended_const__"); 90 if (HasMultiMemory) 91 Builder.defineMacro("__wasm_multimemory__"); 92 if (HasFP16) 93 Builder.defineMacro("__wasm_fp16__"); 94 if (HasMultivalue) 95 Builder.defineMacro("__wasm_multivalue__"); 96 if (HasMutableGlobals) 97 Builder.defineMacro("__wasm_mutable_globals__"); 98 if (HasNontrappingFPToInt) 99 Builder.defineMacro("__wasm_nontrapping_fptoint__"); 100 if (HasReferenceTypes) 101 Builder.defineMacro("__wasm_reference_types__"); 102 if (SIMDLevel >= RelaxedSIMD) 103 Builder.defineMacro("__wasm_relaxed_simd__"); 104 if (HasSignExt) 105 Builder.defineMacro("__wasm_sign_ext__"); 106 if (SIMDLevel >= SIMD128) 107 Builder.defineMacro("__wasm_simd128__"); 108 if (HasTailCall) 109 Builder.defineMacro("__wasm_tail_call__"); 110 if (HasWideArithmetic) 111 Builder.defineMacro("__wasm_wide_arithmetic__"); 112 113 Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_1"); 114 Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_2"); 115 Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4"); 116 Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8"); 117 } 118 119 void WebAssemblyTargetInfo::setSIMDLevel(llvm::StringMap<bool> &Features, 120 SIMDEnum Level, bool Enabled) { 121 if (Enabled) { 122 switch (Level) { 123 case RelaxedSIMD: 124 Features["relaxed-simd"] = true; 125 [[fallthrough]]; 126 case SIMD128: 127 Features["simd128"] = true; 128 [[fallthrough]]; 129 case NoSIMD: 130 break; 131 } 132 return; 133 } 134 135 switch (Level) { 136 case NoSIMD: 137 case SIMD128: 138 Features["simd128"] = false; 139 [[fallthrough]]; 140 case RelaxedSIMD: 141 Features["relaxed-simd"] = false; 142 break; 143 } 144 } 145 146 void WebAssemblyTargetInfo::setFeatureEnabled(llvm::StringMap<bool> &Features, 147 StringRef Name, 148 bool Enabled) const { 149 if (Name == "simd128") 150 setSIMDLevel(Features, SIMD128, Enabled); 151 else if (Name == "relaxed-simd") 152 setSIMDLevel(Features, RelaxedSIMD, Enabled); 153 else 154 Features[Name] = Enabled; 155 } 156 157 bool WebAssemblyTargetInfo::initFeatureMap( 158 llvm::StringMap<bool> &Features, DiagnosticsEngine &Diags, StringRef CPU, 159 const std::vector<std::string> &FeaturesVec) const { 160 auto addGenericFeatures = [&]() { 161 Features["bulk-memory"] = true; 162 Features["bulk-memory-opt"] = true; 163 Features["call-indirect-overlong"] = true; 164 Features["multivalue"] = true; 165 Features["mutable-globals"] = true; 166 Features["nontrapping-fptoint"] = true; 167 Features["reference-types"] = true; 168 Features["sign-ext"] = true; 169 }; 170 auto addBleedingEdgeFeatures = [&]() { 171 addGenericFeatures(); 172 Features["atomics"] = true; 173 Features["exception-handling"] = true; 174 Features["extended-const"] = true; 175 Features["fp16"] = true; 176 Features["multimemory"] = true; 177 Features["tail-call"] = true; 178 Features["wide-arithmetic"] = true; 179 setSIMDLevel(Features, RelaxedSIMD, true); 180 }; 181 if (CPU == "generic") { 182 addGenericFeatures(); 183 } else if (CPU == "bleeding-edge") { 184 addBleedingEdgeFeatures(); 185 } 186 187 return TargetInfo::initFeatureMap(Features, Diags, CPU, FeaturesVec); 188 } 189 190 bool WebAssemblyTargetInfo::handleTargetFeatures( 191 std::vector<std::string> &Features, DiagnosticsEngine &Diags) { 192 for (const auto &Feature : Features) { 193 if (Feature == "+atomics") { 194 HasAtomics = true; 195 continue; 196 } 197 if (Feature == "-atomics") { 198 HasAtomics = false; 199 continue; 200 } 201 if (Feature == "+bulk-memory") { 202 HasBulkMemory = true; 203 continue; 204 } 205 if (Feature == "-bulk-memory") { 206 HasBulkMemory = false; 207 continue; 208 } 209 if (Feature == "+bulk-memory-opt") { 210 HasBulkMemoryOpt = true; 211 continue; 212 } 213 if (Feature == "-bulk-memory-opt") { 214 HasBulkMemoryOpt = false; 215 continue; 216 } 217 if (Feature == "+call-indirect-overlong") { 218 HasCallIndirectOverlong = true; 219 continue; 220 } 221 if (Feature == "-call-indirect-overlong") { 222 HasCallIndirectOverlong = false; 223 continue; 224 } 225 if (Feature == "+exception-handling") { 226 HasExceptionHandling = true; 227 continue; 228 } 229 if (Feature == "-exception-handling") { 230 HasExceptionHandling = false; 231 continue; 232 } 233 if (Feature == "+extended-const") { 234 HasExtendedConst = true; 235 continue; 236 } 237 if (Feature == "-extended-const") { 238 HasExtendedConst = false; 239 continue; 240 } 241 if (Feature == "+fp16") { 242 SIMDLevel = std::max(SIMDLevel, SIMD128); 243 HasFP16 = true; 244 continue; 245 } 246 if (Feature == "-fp16") { 247 HasFP16 = false; 248 continue; 249 } 250 if (Feature == "+multimemory") { 251 HasMultiMemory = true; 252 continue; 253 } 254 if (Feature == "-multimemory") { 255 HasMultiMemory = false; 256 continue; 257 } 258 if (Feature == "+multivalue") { 259 HasMultivalue = true; 260 continue; 261 } 262 if (Feature == "-multivalue") { 263 HasMultivalue = false; 264 continue; 265 } 266 if (Feature == "+mutable-globals") { 267 HasMutableGlobals = true; 268 continue; 269 } 270 if (Feature == "-mutable-globals") { 271 HasMutableGlobals = false; 272 continue; 273 } 274 if (Feature == "+nontrapping-fptoint") { 275 HasNontrappingFPToInt = true; 276 continue; 277 } 278 if (Feature == "-nontrapping-fptoint") { 279 HasNontrappingFPToInt = false; 280 continue; 281 } 282 if (Feature == "+reference-types") { 283 HasReferenceTypes = true; 284 continue; 285 } 286 if (Feature == "-reference-types") { 287 HasReferenceTypes = false; 288 continue; 289 } 290 if (Feature == "+relaxed-simd") { 291 SIMDLevel = std::max(SIMDLevel, RelaxedSIMD); 292 continue; 293 } 294 if (Feature == "-relaxed-simd") { 295 SIMDLevel = std::min(SIMDLevel, SIMDEnum(RelaxedSIMD - 1)); 296 continue; 297 } 298 if (Feature == "+sign-ext") { 299 HasSignExt = true; 300 continue; 301 } 302 if (Feature == "-sign-ext") { 303 HasSignExt = false; 304 continue; 305 } 306 if (Feature == "+simd128") { 307 SIMDLevel = std::max(SIMDLevel, SIMD128); 308 continue; 309 } 310 if (Feature == "-simd128") { 311 SIMDLevel = std::min(SIMDLevel, SIMDEnum(SIMD128 - 1)); 312 continue; 313 } 314 if (Feature == "+tail-call") { 315 HasTailCall = true; 316 continue; 317 } 318 if (Feature == "-tail-call") { 319 HasTailCall = false; 320 continue; 321 } 322 if (Feature == "+wide-arithmetic") { 323 HasWideArithmetic = true; 324 continue; 325 } 326 if (Feature == "-wide-arithmetic") { 327 HasWideArithmetic = false; 328 continue; 329 } 330 331 Diags.Report(diag::err_opt_not_valid_with_opt) 332 << Feature << "-target-feature"; 333 return false; 334 } 335 336 // bulk-memory-opt is a subset of bulk-memory. 337 if (HasBulkMemory) { 338 HasBulkMemoryOpt = true; 339 } 340 341 // The reference-types feature included the change to `call_indirect` 342 // encodings to support overlong immediates. 343 if (HasReferenceTypes) { 344 HasCallIndirectOverlong = true; 345 } 346 347 return true; 348 } 349 350 ArrayRef<Builtin::Info> WebAssemblyTargetInfo::getTargetBuiltins() const { 351 return llvm::ArrayRef(BuiltinInfo, clang::WebAssembly::LastTSBuiltin - 352 Builtin::FirstTSBuiltin); 353 } 354 355 void WebAssemblyTargetInfo::adjust(DiagnosticsEngine &Diags, 356 LangOptions &Opts) { 357 TargetInfo::adjust(Diags, Opts); 358 // Turn off POSIXThreads and ThreadModel so that we don't predefine _REENTRANT 359 // or __STDCPP_THREADS__ if we will eventually end up stripping atomics 360 // because they are unsupported. 361 if (!HasAtomics || !HasBulkMemory) { 362 Opts.POSIXThreads = false; 363 Opts.setThreadModel(LangOptions::ThreadModelKind::Single); 364 Opts.ThreadsafeStatics = false; 365 } 366 } 367 368 void WebAssembly32TargetInfo::getTargetDefines(const LangOptions &Opts, 369 MacroBuilder &Builder) const { 370 WebAssemblyTargetInfo::getTargetDefines(Opts, Builder); 371 defineCPUMacros(Builder, "wasm32", /*Tuning=*/false); 372 } 373 374 void WebAssembly64TargetInfo::getTargetDefines(const LangOptions &Opts, 375 MacroBuilder &Builder) const { 376 WebAssemblyTargetInfo::getTargetDefines(Opts, Builder); 377 defineCPUMacros(Builder, "wasm64", /*Tuning=*/false); 378 } 379