lib/MC/MCParser/DarwinAsmParser.cpp

   1 //===- DarwinAsmParser.cpp - Darwin (Mach-O) Assembly Parser --------------===//
   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 #include "llvm/ADT/STLExtras.h"
  10 #include "llvm/ADT/SmallVector.h"
  11 #include "llvm/ADT/StringRef.h"
  12 #include "llvm/ADT/StringSwitch.h"
  13 #include "llvm/ADT/Triple.h"
  14 #include "llvm/ADT/Twine.h"
  15 #include "llvm/BinaryFormat/MachO.h"
  16 #include "llvm/MC/MCContext.h"
  17 #include "llvm/MC/MCDirectives.h"
  18 #include "llvm/MC/MCObjectFileInfo.h"
  19 #include "llvm/MC/MCParser/MCAsmLexer.h"
  20 #include "llvm/MC/MCParser/MCAsmParser.h"
  21 #include "llvm/MC/MCParser/MCAsmParserExtension.h"
  22 #include "llvm/MC/MCSectionMachO.h"
  23 #include "llvm/MC/MCStreamer.h"
  24 #include "llvm/MC/MCSymbol.h"
  25 #include "llvm/MC/SectionKind.h"
  26 #include "llvm/Support/FileSystem.h"
  27 #include "llvm/Support/MemoryBuffer.h"
  28 #include "llvm/Support/SMLoc.h"
  29 #include "llvm/Support/SourceMgr.h"
  30 #include "llvm/Support/raw_ostream.h"
  31 #include <algorithm>
  32 #include <cstddef>
  33 #include <cstdint>
  34 #include <string>
  35 #include <system_error>
  36 #include <utility>
  37
  38 using namespace llvm;
  39
  40 namespace {
  41
  42 /// Implementation of directive handling which is shared across all
  43 /// Darwin targets.
  44 class DarwinAsmParser : public MCAsmParserExtension {
  45   template<bool (DarwinAsmParser::*HandlerMethod)(StringRef, SMLoc)>
  46   void addDirectiveHandler(StringRef Directive) {
  47     MCAsmParser::ExtensionDirectiveHandler Handler = std::make_pair(
  48         this, HandleDirective<DarwinAsmParser, HandlerMethod>);
  49     getParser().addDirectiveHandler(Directive, Handler);
  50   }
  51
  52   bool parseSectionSwitch(StringRef Segment, StringRef Section,
  53                           unsigned TAA = 0, unsigned ImplicitAlign = 0,
  54                           unsigned StubSize = 0);
  55
  56   SMLoc LastVersionDirective;
  57
  58 public:
  59   DarwinAsmParser() = default;
  60
  61   void Initialize(MCAsmParser &Parser) override {
  62     // Call the base implementation.
  63     this->MCAsmParserExtension::Initialize(Parser);
  64
  65     addDirectiveHandler<&DarwinAsmParser::parseDirectiveAltEntry>(".alt_entry");
  66     addDirectiveHandler<&DarwinAsmParser::parseDirectiveDesc>(".desc");
  67     addDirectiveHandler<&DarwinAsmParser::parseDirectiveIndirectSymbol>(
  68       ".indirect_symbol");
  69     addDirectiveHandler<&DarwinAsmParser::parseDirectiveLsym>(".lsym");
  70     addDirectiveHandler<&DarwinAsmParser::parseDirectiveSubsectionsViaSymbols>(
  71       ".subsections_via_symbols");
  72     addDirectiveHandler<&DarwinAsmParser::parseDirectiveDumpOrLoad>(".dump");
  73     addDirectiveHandler<&DarwinAsmParser::parseDirectiveDumpOrLoad>(".load");
  74     addDirectiveHandler<&DarwinAsmParser::parseDirectiveSection>(".section");
  75     addDirectiveHandler<&DarwinAsmParser::parseDirectivePushSection>(
  76       ".pushsection");
  77     addDirectiveHandler<&DarwinAsmParser::parseDirectivePopSection>(
  78       ".popsection");
  79     addDirectiveHandler<&DarwinAsmParser::parseDirectivePrevious>(".previous");
  80     addDirectiveHandler<&DarwinAsmParser::parseDirectiveSecureLogUnique>(
  81       ".secure_log_unique");
  82     addDirectiveHandler<&DarwinAsmParser::parseDirectiveSecureLogReset>(
  83       ".secure_log_reset");
  84     addDirectiveHandler<&DarwinAsmParser::parseDirectiveTBSS>(".tbss");
  85     addDirectiveHandler<&DarwinAsmParser::parseDirectiveZerofill>(".zerofill");
  86
  87     addDirectiveHandler<&DarwinAsmParser::parseDirectiveDataRegion>(
  88       ".data_region");
  89     addDirectiveHandler<&DarwinAsmParser::parseDirectiveDataRegionEnd>(
  90       ".end_data_region");
  91
  92     // Special section directives.
  93     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveBss>(".bss");
  94     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveConst>(".const");
  95     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveConstData>(
  96       ".const_data");
  97     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveConstructor>(
  98       ".constructor");
  99     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveCString>(
 100       ".cstring");
 101     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveData>(".data");
 102     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveDestructor>(
 103       ".destructor");
 104     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveDyld>(".dyld");
 105     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveFVMLibInit0>(
 106       ".fvmlib_init0");
 107     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveFVMLibInit1>(
 108       ".fvmlib_init1");
 109     addDirectiveHandler<
 110       &DarwinAsmParser::parseSectionDirectiveLazySymbolPointers>(
 111         ".lazy_symbol_pointer");
 112     addDirectiveHandler<&DarwinAsmParser::parseDirectiveLinkerOption>(
 113       ".linker_option");
 114     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveLiteral16>(
 115       ".literal16");
 116     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveLiteral4>(
 117       ".literal4");
 118     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveLiteral8>(
 119       ".literal8");
 120     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveModInitFunc>(
 121       ".mod_init_func");
 122     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveModTermFunc>(
 123       ".mod_term_func");
 124     addDirectiveHandler<
 125       &DarwinAsmParser::parseSectionDirectiveNonLazySymbolPointers>(
 126         ".non_lazy_symbol_pointer");
 127     addDirectiveHandler<
 128       &DarwinAsmParser::parseSectionDirectiveThreadLocalVariablePointers>(
 129         ".thread_local_variable_pointer");
 130     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCCatClsMeth>(
 131       ".objc_cat_cls_meth");
 132     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCCatInstMeth>(
 133       ".objc_cat_inst_meth");
 134     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCCategory>(
 135       ".objc_category");
 136     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCClass>(
 137       ".objc_class");
 138     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCClassNames>(
 139       ".objc_class_names");
 140     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCClassVars>(
 141       ".objc_class_vars");
 142     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCClsMeth>(
 143       ".objc_cls_meth");
 144     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCClsRefs>(
 145       ".objc_cls_refs");
 146     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCInstMeth>(
 147       ".objc_inst_meth");
 148     addDirectiveHandler<
 149       &DarwinAsmParser::parseSectionDirectiveObjCInstanceVars>(
 150         ".objc_instance_vars");
 151     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCMessageRefs>(
 152       ".objc_message_refs");
 153     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCMetaClass>(
 154       ".objc_meta_class");
 155     addDirectiveHandler<
 156       &DarwinAsmParser::parseSectionDirectiveObjCMethVarNames>(
 157         ".objc_meth_var_names");
 158     addDirectiveHandler<
 159       &DarwinAsmParser::parseSectionDirectiveObjCMethVarTypes>(
 160         ".objc_meth_var_types");
 161     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCModuleInfo>(
 162       ".objc_module_info");
 163     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCProtocol>(
 164       ".objc_protocol");
 165     addDirectiveHandler<
 166       &DarwinAsmParser::parseSectionDirectiveObjCSelectorStrs>(
 167         ".objc_selector_strs");
 168     addDirectiveHandler<
 169       &DarwinAsmParser::parseSectionDirectiveObjCStringObject>(
 170         ".objc_string_object");
 171     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCSymbols>(
 172       ".objc_symbols");
 173     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectivePICSymbolStub>(
 174       ".picsymbol_stub");
 175     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveStaticConst>(
 176       ".static_const");
 177     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveStaticData>(
 178       ".static_data");
 179     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveSymbolStub>(
 180       ".symbol_stub");
 181     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveTData>(".tdata");
 182     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveText>(".text");
 183     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveThreadInitFunc>(
 184       ".thread_init_func");
 185     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveTLV>(".tlv");
 186
 187     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveIdent>(".ident");
 188     addDirectiveHandler<&DarwinAsmParser::parseWatchOSVersionMin>(
 189       ".watchos_version_min");
 190     addDirectiveHandler<&DarwinAsmParser::parseTvOSVersionMin>(
 191       ".tvos_version_min");
 192     addDirectiveHandler<&DarwinAsmParser::parseIOSVersionMin>(
 193       ".ios_version_min");
 194     addDirectiveHandler<&DarwinAsmParser::parseMacOSXVersionMin>(
 195       ".macosx_version_min");
 196     addDirectiveHandler<&DarwinAsmParser::parseBuildVersion>(".build_version");
 197
 198     LastVersionDirective = SMLoc();
 199   }
 200
 201   bool parseDirectiveAltEntry(StringRef, SMLoc);
 202   bool parseDirectiveDesc(StringRef, SMLoc);
 203   bool parseDirectiveIndirectSymbol(StringRef, SMLoc);
 204   bool parseDirectiveDumpOrLoad(StringRef, SMLoc);
 205   bool parseDirectiveLsym(StringRef, SMLoc);
 206   bool parseDirectiveLinkerOption(StringRef, SMLoc);
 207   bool parseDirectiveSection(StringRef, SMLoc);
 208   bool parseDirectivePushSection(StringRef, SMLoc);
 209   bool parseDirectivePopSection(StringRef, SMLoc);
 210   bool parseDirectivePrevious(StringRef, SMLoc);
 211   bool parseDirectiveSecureLogReset(StringRef, SMLoc);
 212   bool parseDirectiveSecureLogUnique(StringRef, SMLoc);
 213   bool parseDirectiveSubsectionsViaSymbols(StringRef, SMLoc);
 214   bool parseDirectiveTBSS(StringRef, SMLoc);
 215   bool parseDirectiveZerofill(StringRef, SMLoc);
 216   bool parseDirectiveDataRegion(StringRef, SMLoc);
 217   bool parseDirectiveDataRegionEnd(StringRef, SMLoc);
 218
 219   // Named Section Directive
 220   bool parseSectionDirectiveBss(StringRef, SMLoc) {
 221     return parseSectionSwitch("__DATA", "__bss");
 222   }
 223
 224   bool parseSectionDirectiveConst(StringRef, SMLoc) {
 225     return parseSectionSwitch("__TEXT", "__const");
 226   }
 227
 228   bool parseSectionDirectiveStaticConst(StringRef, SMLoc) {
 229     return parseSectionSwitch("__TEXT", "__static_const");
 230   }
 231
 232   bool parseSectionDirectiveCString(StringRef, SMLoc) {
 233     return parseSectionSwitch("__TEXT","__cstring",
 234                               MachO::S_CSTRING_LITERALS);
 235   }
 236
 237   bool parseSectionDirectiveLiteral4(StringRef, SMLoc) {
 238     return parseSectionSwitch("__TEXT", "__literal4",
 239                               MachO::S_4BYTE_LITERALS, 4);
 240   }
 241
 242   bool parseSectionDirectiveLiteral8(StringRef, SMLoc) {
 243     return parseSectionSwitch("__TEXT", "__literal8",
 244                               MachO::S_8BYTE_LITERALS, 8);
 245   }
 246
 247   bool parseSectionDirectiveLiteral16(StringRef, SMLoc) {
 248     return parseSectionSwitch("__TEXT","__literal16",
 249                               MachO::S_16BYTE_LITERALS, 16);
 250   }
 251
 252   bool parseSectionDirectiveConstructor(StringRef, SMLoc) {
 253     return parseSectionSwitch("__TEXT","__constructor");
 254   }
 255
 256   bool parseSectionDirectiveDestructor(StringRef, SMLoc) {
 257     return parseSectionSwitch("__TEXT","__destructor");
 258   }
 259
 260   bool parseSectionDirectiveFVMLibInit0(StringRef, SMLoc) {
 261     return parseSectionSwitch("__TEXT","__fvmlib_init0");
 262   }
 263
 264   bool parseSectionDirectiveFVMLibInit1(StringRef, SMLoc) {
 265     return parseSectionSwitch("__TEXT","__fvmlib_init1");
 266   }
 267
 268   bool parseSectionDirectiveSymbolStub(StringRef, SMLoc) {
 269     return parseSectionSwitch("__TEXT","__symbol_stub",
 270                               MachO::S_SYMBOL_STUBS |
 271                               MachO::S_ATTR_PURE_INSTRUCTIONS,
 272                               // FIXME: Different on PPC and ARM.
 273                               0, 16);
 274   }
 275
 276   bool parseSectionDirectivePICSymbolStub(StringRef, SMLoc) {
 277     return parseSectionSwitch("__TEXT","__picsymbol_stub",
 278                               MachO::S_SYMBOL_STUBS |
 279                               MachO::S_ATTR_PURE_INSTRUCTIONS, 0, 26);
 280   }
 281
 282   bool parseSectionDirectiveData(StringRef, SMLoc) {
 283     return parseSectionSwitch("__DATA", "__data");
 284   }
 285
 286   bool parseSectionDirectiveStaticData(StringRef, SMLoc) {
 287     return parseSectionSwitch("__DATA", "__static_data");
 288   }
 289
 290   bool parseSectionDirectiveNonLazySymbolPointers(StringRef, SMLoc) {
 291     return parseSectionSwitch("__DATA", "__nl_symbol_ptr",
 292                               MachO::S_NON_LAZY_SYMBOL_POINTERS, 4);
 293   }
 294
 295   bool parseSectionDirectiveLazySymbolPointers(StringRef, SMLoc) {
 296     return parseSectionSwitch("__DATA", "__la_symbol_ptr",
 297                               MachO::S_LAZY_SYMBOL_POINTERS, 4);
 298   }
 299
 300   bool parseSectionDirectiveThreadLocalVariablePointers(StringRef, SMLoc) {
 301     return parseSectionSwitch("__DATA", "__thread_ptr",
 302                               MachO::S_THREAD_LOCAL_VARIABLE_POINTERS, 4);
 303   }
 304
 305   bool parseSectionDirectiveDyld(StringRef, SMLoc) {
 306     return parseSectionSwitch("__DATA", "__dyld");
 307   }
 308
 309   bool parseSectionDirectiveModInitFunc(StringRef, SMLoc) {
 310     return parseSectionSwitch("__DATA", "__mod_init_func",
 311                               MachO::S_MOD_INIT_FUNC_POINTERS, 4);
 312   }
 313
 314   bool parseSectionDirectiveModTermFunc(StringRef, SMLoc) {
 315     return parseSectionSwitch("__DATA", "__mod_term_func",
 316                               MachO::S_MOD_TERM_FUNC_POINTERS, 4);
 317   }
 318
 319   bool parseSectionDirectiveConstData(StringRef, SMLoc) {
 320     return parseSectionSwitch("__DATA", "__const");
 321   }
 322
 323   bool parseSectionDirectiveObjCClass(StringRef, SMLoc) {
 324     return parseSectionSwitch("__OBJC", "__class",
 325                               MachO::S_ATTR_NO_DEAD_STRIP);
 326   }
 327
 328   bool parseSectionDirectiveObjCMetaClass(StringRef, SMLoc) {
 329     return parseSectionSwitch("__OBJC", "__meta_class",
 330                               MachO::S_ATTR_NO_DEAD_STRIP);
 331   }
 332
 333   bool parseSectionDirectiveObjCCatClsMeth(StringRef, SMLoc) {
 334     return parseSectionSwitch("__OBJC", "__cat_cls_meth",
 335                               MachO::S_ATTR_NO_DEAD_STRIP);
 336   }
 337
 338   bool parseSectionDirectiveObjCCatInstMeth(StringRef, SMLoc) {
 339     return parseSectionSwitch("__OBJC", "__cat_inst_meth",
 340                               MachO::S_ATTR_NO_DEAD_STRIP);
 341   }
 342
 343   bool parseSectionDirectiveObjCProtocol(StringRef, SMLoc) {
 344     return parseSectionSwitch("__OBJC", "__protocol",
 345                               MachO::S_ATTR_NO_DEAD_STRIP);
 346   }
 347
 348   bool parseSectionDirectiveObjCStringObject(StringRef, SMLoc) {
 349     return parseSectionSwitch("__OBJC", "__string_object",
 350                               MachO::S_ATTR_NO_DEAD_STRIP);
 351   }
 352
 353   bool parseSectionDirectiveObjCClsMeth(StringRef, SMLoc) {
 354     return parseSectionSwitch("__OBJC", "__cls_meth",
 355                               MachO::S_ATTR_NO_DEAD_STRIP);
 356   }
 357
 358   bool parseSectionDirectiveObjCInstMeth(StringRef, SMLoc) {
 359     return parseSectionSwitch("__OBJC", "__inst_meth",
 360                               MachO::S_ATTR_NO_DEAD_STRIP);
 361   }
 362
 363   bool parseSectionDirectiveObjCClsRefs(StringRef, SMLoc) {
 364     return parseSectionSwitch("__OBJC", "__cls_refs",
 365                               MachO::S_ATTR_NO_DEAD_STRIP |
 366                               MachO::S_LITERAL_POINTERS, 4);
 367   }
 368
 369   bool parseSectionDirectiveObjCMessageRefs(StringRef, SMLoc) {
 370     return parseSectionSwitch("__OBJC", "__message_refs",
 371                               MachO::S_ATTR_NO_DEAD_STRIP |
 372                               MachO::S_LITERAL_POINTERS, 4);
 373   }
 374
 375   bool parseSectionDirectiveObjCSymbols(StringRef, SMLoc) {
 376     return parseSectionSwitch("__OBJC", "__symbols",
 377                               MachO::S_ATTR_NO_DEAD_STRIP);
 378   }
 379
 380   bool parseSectionDirectiveObjCCategory(StringRef, SMLoc) {
 381     return parseSectionSwitch("__OBJC", "__category",
 382                               MachO::S_ATTR_NO_DEAD_STRIP);
 383   }
 384
 385   bool parseSectionDirectiveObjCClassVars(StringRef, SMLoc) {
 386     return parseSectionSwitch("__OBJC", "__class_vars",
 387                               MachO::S_ATTR_NO_DEAD_STRIP);
 388   }
 389
 390   bool parseSectionDirectiveObjCInstanceVars(StringRef, SMLoc) {
 391     return parseSectionSwitch("__OBJC", "__instance_vars",
 392                               MachO::S_ATTR_NO_DEAD_STRIP);
 393   }
 394
 395   bool parseSectionDirectiveObjCModuleInfo(StringRef, SMLoc) {
 396     return parseSectionSwitch("__OBJC", "__module_info",
 397                               MachO::S_ATTR_NO_DEAD_STRIP);
 398   }
 399
 400   bool parseSectionDirectiveObjCClassNames(StringRef, SMLoc) {
 401     return parseSectionSwitch("__TEXT", "__cstring",
 402                               MachO::S_CSTRING_LITERALS);
 403   }
 404
 405   bool parseSectionDirectiveObjCMethVarTypes(StringRef, SMLoc) {
 406     return parseSectionSwitch("__TEXT", "__cstring",
 407                               MachO::S_CSTRING_LITERALS);
 408   }
 409
 410   bool parseSectionDirectiveObjCMethVarNames(StringRef, SMLoc) {
 411     return parseSectionSwitch("__TEXT", "__cstring",
 412                               MachO::S_CSTRING_LITERALS);
 413   }
 414
 415   bool parseSectionDirectiveObjCSelectorStrs(StringRef, SMLoc) {
 416     return parseSectionSwitch("__OBJC", "__selector_strs",
 417                               MachO::S_CSTRING_LITERALS);
 418   }
 419
 420   bool parseSectionDirectiveTData(StringRef, SMLoc) {
 421     return parseSectionSwitch("__DATA", "__thread_data",
 422                               MachO::S_THREAD_LOCAL_REGULAR);
 423   }
 424
 425   bool parseSectionDirectiveText(StringRef, SMLoc) {
 426     return parseSectionSwitch("__TEXT", "__text",
 427                               MachO::S_ATTR_PURE_INSTRUCTIONS);
 428   }
 429
 430   bool parseSectionDirectiveTLV(StringRef, SMLoc) {
 431     return parseSectionSwitch("__DATA", "__thread_vars",
 432                               MachO::S_THREAD_LOCAL_VARIABLES);
 433   }
 434
 435   bool parseSectionDirectiveIdent(StringRef, SMLoc) {
 436     // Darwin silently ignores the .ident directive.
 437     getParser().eatToEndOfStatement();
 438     return false;
 439   }
 440
 441   bool parseSectionDirectiveThreadInitFunc(StringRef, SMLoc) {
 442     return parseSectionSwitch("__DATA", "__thread_init",
 443                          MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS);
 444   }
 445
 446   bool parseWatchOSVersionMin(StringRef Directive, SMLoc Loc) {
 447     return parseVersionMin(Directive, Loc, MCVM_WatchOSVersionMin);
 448   }
 449   bool parseTvOSVersionMin(StringRef Directive, SMLoc Loc) {
 450     return parseVersionMin(Directive, Loc, MCVM_TvOSVersionMin);
 451   }
 452   bool parseIOSVersionMin(StringRef Directive, SMLoc Loc) {
 453     return parseVersionMin(Directive, Loc, MCVM_IOSVersionMin);
 454   }
 455   bool parseMacOSXVersionMin(StringRef Directive, SMLoc Loc) {
 456     return parseVersionMin(Directive, Loc, MCVM_OSXVersionMin);
 457   }
 458
 459   bool parseBuildVersion(StringRef Directive, SMLoc Loc);
 460   bool parseVersionMin(StringRef Directive, SMLoc Loc, MCVersionMinType Type);
 461   bool parseMajorMinorVersionComponent(unsigned *Major, unsigned *Minor,
 462                                        const char *VersionName);
 463   bool parseOptionalTrailingVersionComponent(unsigned *Component,
 464                                              const char *ComponentName);
 465   bool parseVersion(unsigned *Major, unsigned *Minor, unsigned *Update);
 466   bool parseSDKVersion(VersionTuple &SDKVersion);
 467   void checkVersion(StringRef Directive, StringRef Arg, SMLoc Loc,
 468                     Triple::OSType ExpectedOS);
 469 };
 470
 471 } // end anonymous namespace
 472
 473 bool DarwinAsmParser::parseSectionSwitch(StringRef Segment, StringRef Section,
 474                                          unsigned TAA, unsigned Align,
 475                                          unsigned StubSize) {
 476   if (getLexer().isNot(AsmToken::EndOfStatement))
 477     return TokError("unexpected token in section switching directive");
 478   Lex();
 479
 480   // FIXME: Arch specific.
 481   bool isText = TAA & MachO::S_ATTR_PURE_INSTRUCTIONS;
 482   getStreamer().SwitchSection(getContext().getMachOSection(
 483       Segment, Section, TAA, StubSize,
 484       isText ? SectionKind::getText() : SectionKind::getData()));
 485
 486   // Set the implicit alignment, if any.
 487   //
 488   // FIXME: This isn't really what 'as' does; I think it just uses the implicit
 489   // alignment on the section (e.g., if one manually inserts bytes into the
 490   // section, then just issuing the section switch directive will not realign
 491   // the section. However, this is arguably more reasonable behavior, and there
 492   // is no good reason for someone to intentionally emit incorrectly sized
 493   // values into the implicitly aligned sections.
 494   if (Align)
 495     getStreamer().EmitValueToAlignment(Align);
 496
 497   return false;
 498 }
 499
 500 /// parseDirectiveAltEntry
 501 ///  ::= .alt_entry identifier
 502 bool DarwinAsmParser::parseDirectiveAltEntry(StringRef, SMLoc) {
 503   StringRef Name;
 504   if (getParser().parseIdentifier(Name))
 505     return TokError("expected identifier in directive");
 506
 507   // Look up symbol.
 508   MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
 509
 510   if (Sym->isDefined())
 511     return TokError(".alt_entry must preceed symbol definition");
 512
 513   if (!getStreamer().EmitSymbolAttribute(Sym, MCSA_AltEntry))
 514     return TokError("unable to emit symbol attribute");
 515
 516   Lex();
 517   return false;
 518 }
 519
 520 /// parseDirectiveDesc
 521 ///  ::= .desc identifier , expression
 522 bool DarwinAsmParser::parseDirectiveDesc(StringRef, SMLoc) {
 523   StringRef Name;
 524   if (getParser().parseIdentifier(Name))
 525     return TokError("expected identifier in directive");
 526
 527   // Handle the identifier as the key symbol.
 528   MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
 529
 530   if (getLexer().isNot(AsmToken::Comma))
 531     return TokError("unexpected token in '.desc' directive");
 532   Lex();
 533
 534   int64_t DescValue;
 535   if (getParser().parseAbsoluteExpression(DescValue))
 536     return true;
 537
 538   if (getLexer().isNot(AsmToken::EndOfStatement))
 539     return TokError("unexpected token in '.desc' directive");
 540
 541   Lex();
 542
 543   // Set the n_desc field of this Symbol to this DescValue
 544   getStreamer().EmitSymbolDesc(Sym, DescValue);
 545
 546   return false;
 547 }
 548
 549 /// parseDirectiveIndirectSymbol
 550 ///  ::= .indirect_symbol identifier
 551 bool DarwinAsmParser::parseDirectiveIndirectSymbol(StringRef, SMLoc Loc) {
 552   const MCSectionMachO *Current = static_cast<const MCSectionMachO *>(
 553       getStreamer().getCurrentSectionOnly());
 554   MachO::SectionType SectionType = Current->getType();
 555   if (SectionType != MachO::S_NON_LAZY_SYMBOL_POINTERS &&
 556       SectionType != MachO::S_LAZY_SYMBOL_POINTERS &&
 557       SectionType != MachO::S_THREAD_LOCAL_VARIABLE_POINTERS &&
 558       SectionType != MachO::S_SYMBOL_STUBS)
 559     return Error(Loc, "indirect symbol not in a symbol pointer or stub "
 560                       "section");
 561
 562   StringRef Name;
 563   if (getParser().parseIdentifier(Name))
 564     return TokError("expected identifier in .indirect_symbol directive");
 565
 566   MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
 567
 568   // Assembler local symbols don't make any sense here. Complain loudly.
 569   if (Sym->isTemporary())
 570     return TokError("non-local symbol required in directive");
 571
 572   if (!getStreamer().EmitSymbolAttribute(Sym, MCSA_IndirectSymbol))
 573     return TokError("unable to emit indirect symbol attribute for: " + Name);
 574
 575   if (getLexer().isNot(AsmToken::EndOfStatement))
 576     return TokError("unexpected token in '.indirect_symbol' directive");
 577
 578   Lex();
 579
 580   return false;
 581 }
 582
 583 /// parseDirectiveDumpOrLoad
 584 ///  ::= ( .dump | .load ) "filename"
 585 bool DarwinAsmParser::parseDirectiveDumpOrLoad(StringRef Directive,
 586                                                SMLoc IDLoc) {
 587   bool IsDump = Directive == ".dump";
 588   if (getLexer().isNot(AsmToken::String))
 589     return TokError("expected string in '.dump' or '.load' directive");
 590
 591   Lex();
 592
 593   if (getLexer().isNot(AsmToken::EndOfStatement))
 594     return TokError("unexpected token in '.dump' or '.load' directive");
 595
 596   Lex();
 597
 598   // FIXME: If/when .dump and .load are implemented they will be done in the
 599   // the assembly parser and not have any need for an MCStreamer API.
 600   if (IsDump)
 601     return Warning(IDLoc, "ignoring directive .dump for now");
 602   else
 603     return Warning(IDLoc, "ignoring directive .load for now");
 604 }
 605
 606 /// ParseDirectiveLinkerOption
 607 ///  ::= .linker_option "string" ( , "string" )*
 608 bool DarwinAsmParser::parseDirectiveLinkerOption(StringRef IDVal, SMLoc) {
 609   SmallVector<std::string, 4> Args;
 610   while (true) {
 611     if (getLexer().isNot(AsmToken::String))
 612       return TokError("expected string in '" + Twine(IDVal) + "' directive");
 613
 614     std::string Data;
 615     if (getParser().parseEscapedString(Data))
 616       return true;
 617
 618     Args.push_back(Data);
 619
 620     if (getLexer().is(AsmToken::EndOfStatement))
 621       break;
 622
 623     if (getLexer().isNot(AsmToken::Comma))
 624       return TokError("unexpected token in '" + Twine(IDVal) + "' directive");
 625     Lex();
 626   }
 627
 628   getStreamer().EmitLinkerOptions(Args);
 629   return false;
 630 }
 631
 632 /// parseDirectiveLsym
 633 ///  ::= .lsym identifier , expression
 634 bool DarwinAsmParser::parseDirectiveLsym(StringRef, SMLoc) {
 635   StringRef Name;
 636   if (getParser().parseIdentifier(Name))
 637     return TokError("expected identifier in directive");
 638
 639   // Handle the identifier as the key symbol.
 640   MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
 641
 642   if (getLexer().isNot(AsmToken::Comma))
 643     return TokError("unexpected token in '.lsym' directive");
 644   Lex();
 645
 646   const MCExpr *Value;
 647   if (getParser().parseExpression(Value))
 648     return true;
 649
 650   if (getLexer().isNot(AsmToken::EndOfStatement))
 651     return TokError("unexpected token in '.lsym' directive");
 652
 653   Lex();
 654
 655   // We don't currently support this directive.
 656   //
 657   // FIXME: Diagnostic location!
 658   (void) Sym;
 659   return TokError("directive '.lsym' is unsupported");
 660 }
 661
 662 /// parseDirectiveSection:
 663 ///   ::= .section identifier (',' identifier)*
 664 bool DarwinAsmParser::parseDirectiveSection(StringRef, SMLoc) {
 665   SMLoc Loc = getLexer().getLoc();
 666
 667   StringRef SectionName;
 668   if (getParser().parseIdentifier(SectionName))
 669     return Error(Loc, "expected identifier after '.section' directive");
 670
 671   // Verify there is a following comma.
 672   if (!getLexer().is(AsmToken::Comma))
 673     return TokError("unexpected token in '.section' directive");
 674
 675   std::string SectionSpec = SectionName;
 676   SectionSpec += ",";
 677
 678   // Add all the tokens until the end of the line, ParseSectionSpecifier will
 679   // handle this.
 680   StringRef EOL = getLexer().LexUntilEndOfStatement();
 681   SectionSpec.append(EOL.begin(), EOL.end());
 682
 683   Lex();
 684   if (getLexer().isNot(AsmToken::EndOfStatement))
 685     return TokError("unexpected token in '.section' directive");
 686   Lex();
 687
 688   StringRef Segment, Section;
 689   unsigned StubSize;
 690   unsigned TAA;
 691   bool TAAParsed;
 692   std::string ErrorStr =
 693     MCSectionMachO::ParseSectionSpecifier(SectionSpec, Segment, Section,
 694                                           TAA, TAAParsed, StubSize);
 695
 696   if (!ErrorStr.empty())
 697     return Error(Loc, ErrorStr);
 698
 699   // Issue a warning if the target is not powerpc and Section is a *coal* section.
 700   Triple TT = getParser().getContext().getObjectFileInfo()->getTargetTriple();
 701   Triple::ArchType ArchTy = TT.getArch();
 702
 703   if (ArchTy != Triple::ppc && ArchTy != Triple::ppc64) {
 704     StringRef NonCoalSection = StringSwitch<StringRef>(Section)
 705                                    .Case("__textcoal_nt", "__text")
 706                                    .Case("__const_coal", "__const")
 707                                    .Case("__datacoal_nt", "__data")
 708                                    .Default(Section);
 709
 710     if (!Section.equals(NonCoalSection)) {
 711       StringRef SectionVal(Loc.getPointer());
 712       size_t B = SectionVal.find(',') + 1, E = SectionVal.find(',', B);
 713       SMLoc BLoc = SMLoc::getFromPointer(SectionVal.data() + B);
 714       SMLoc ELoc = SMLoc::getFromPointer(SectionVal.data() + E);
 715       getParser().Warning(Loc, "section \"" + Section + "\" is deprecated",
 716                           SMRange(BLoc, ELoc));
 717       getParser().Note(Loc, "change section name to \"" + NonCoalSection +
 718                        "\"", SMRange(BLoc, ELoc));
 719     }
 720   }
 721
 722   // FIXME: Arch specific.
 723   bool isText = Segment == "__TEXT";  // FIXME: Hack.
 724   getStreamer().SwitchSection(getContext().getMachOSection(
 725       Segment, Section, TAA, StubSize,
 726       isText ? SectionKind::getText() : SectionKind::getData()));
 727   return false;
 728 }
 729
 730 /// ParseDirectivePushSection:
 731 ///   ::= .pushsection identifier (',' identifier)*
 732 bool DarwinAsmParser::parseDirectivePushSection(StringRef S, SMLoc Loc) {
 733   getStreamer().PushSection();
 734
 735   if (parseDirectiveSection(S, Loc)) {
 736     getStreamer().PopSection();
 737     return true;
 738   }
 739
 740   return false;
 741 }
 742
 743 /// ParseDirectivePopSection:
 744 ///   ::= .popsection
 745 bool DarwinAsmParser::parseDirectivePopSection(StringRef, SMLoc) {
 746   if (!getStreamer().PopSection())
 747     return TokError(".popsection without corresponding .pushsection");
 748   return false;
 749 }
 750
 751 /// ParseDirectivePrevious:
 752 ///   ::= .previous
 753 bool DarwinAsmParser::parseDirectivePrevious(StringRef DirName, SMLoc) {
 754   MCSectionSubPair PreviousSection = getStreamer().getPreviousSection();
 755   if (!PreviousSection.first)
 756     return TokError(".previous without corresponding .section");
 757   getStreamer().SwitchSection(PreviousSection.first, PreviousSection.second);
 758   return false;
 759 }
 760
 761 /// ParseDirectiveSecureLogUnique
 762 ///  ::= .secure_log_unique ... message ...
 763 bool DarwinAsmParser::parseDirectiveSecureLogUnique(StringRef, SMLoc IDLoc) {
 764   StringRef LogMessage = getParser().parseStringToEndOfStatement();
 765   if (getLexer().isNot(AsmToken::EndOfStatement))
 766     return TokError("unexpected token in '.secure_log_unique' directive");
 767
 768   if (getContext().getSecureLogUsed())
 769     return Error(IDLoc, ".secure_log_unique specified multiple times");
 770
 771   // Get the secure log path.
 772   const char *SecureLogFile = getContext().getSecureLogFile();
 773   if (!SecureLogFile)
 774     return Error(IDLoc, ".secure_log_unique used but AS_SECURE_LOG_FILE "
 775                  "environment variable unset.");
 776
 777   // Open the secure log file if we haven't already.
 778   raw_fd_ostream *OS = getContext().getSecureLog();
 779   if (!OS) {
 780     std::error_code EC;
 781     auto NewOS = std::make_unique<raw_fd_ostream>(
 782         StringRef(SecureLogFile), EC, sys::fs::OF_Append | sys::fs::OF_Text);
 783     if (EC)
 784        return Error(IDLoc, Twine("can't open secure log file: ") +
 785                                SecureLogFile + " (" + EC.message() + ")");
 786     OS = NewOS.get();
 787     getContext().setSecureLog(std::move(NewOS));
 788   }
 789
 790   // Write the message.
 791   unsigned CurBuf = getSourceManager().FindBufferContainingLoc(IDLoc);
 792   *OS << getSourceManager().getBufferInfo(CurBuf).Buffer->getBufferIdentifier()
 793       << ":" << getSourceManager().FindLineNumber(IDLoc, CurBuf) << ":"
 794       << LogMessage + "\n";
 795
 796   getContext().setSecureLogUsed(true);
 797
 798   return false;
 799 }
 800
 801 /// ParseDirectiveSecureLogReset
 802 ///  ::= .secure_log_reset
 803 bool DarwinAsmParser::parseDirectiveSecureLogReset(StringRef, SMLoc IDLoc) {
 804   if (getLexer().isNot(AsmToken::EndOfStatement))
 805     return TokError("unexpected token in '.secure_log_reset' directive");
 806
 807   Lex();
 808
 809   getContext().setSecureLogUsed(false);
 810
 811   return false;
 812 }
 813
 814 /// parseDirectiveSubsectionsViaSymbols
 815 ///  ::= .subsections_via_symbols
 816 bool DarwinAsmParser::parseDirectiveSubsectionsViaSymbols(StringRef, SMLoc) {
 817   if (getLexer().isNot(AsmToken::EndOfStatement))
 818     return TokError("unexpected token in '.subsections_via_symbols' directive");
 819
 820   Lex();
 821
 822   getStreamer().EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
 823
 824   return false;
 825 }
 826
 827 /// ParseDirectiveTBSS
 828 ///  ::= .tbss identifier, size, align
 829 bool DarwinAsmParser::parseDirectiveTBSS(StringRef, SMLoc) {
 830   SMLoc IDLoc = getLexer().getLoc();
 831   StringRef Name;
 832   if (getParser().parseIdentifier(Name))
 833     return TokError("expected identifier in directive");
 834
 835   // Handle the identifier as the key symbol.
 836   MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
 837
 838   if (getLexer().isNot(AsmToken::Comma))
 839     return TokError("unexpected token in directive");
 840   Lex();
 841
 842   int64_t Size;
 843   SMLoc SizeLoc = getLexer().getLoc();
 844   if (getParser().parseAbsoluteExpression(Size))
 845     return true;
 846
 847   int64_t Pow2Alignment = 0;
 848   SMLoc Pow2AlignmentLoc;
 849   if (getLexer().is(AsmToken::Comma)) {
 850     Lex();
 851     Pow2AlignmentLoc = getLexer().getLoc();
 852     if (getParser().parseAbsoluteExpression(Pow2Alignment))
 853       return true;
 854   }
 855
 856   if (getLexer().isNot(AsmToken::EndOfStatement))
 857     return TokError("unexpected token in '.tbss' directive");
 858
 859   Lex();
 860
 861   if (Size < 0)
 862     return Error(SizeLoc, "invalid '.tbss' directive size, can't be less than"
 863                  "zero");
 864
 865   // FIXME: Diagnose overflow.
 866   if (Pow2Alignment < 0)
 867     return Error(Pow2AlignmentLoc, "invalid '.tbss' alignment, can't be less"
 868                  "than zero");
 869
 870   if (!Sym->isUndefined())
 871     return Error(IDLoc, "invalid symbol redefinition");
 872
 873   getStreamer().EmitTBSSSymbol(getContext().getMachOSection(
 874                                  "__DATA", "__thread_bss",
 875                                  MachO::S_THREAD_LOCAL_ZEROFILL,
 876                                  0, SectionKind::getThreadBSS()),
 877                                Sym, Size, 1 << Pow2Alignment);
 878
 879   return false;
 880 }
 881
 882 /// ParseDirectiveZerofill
 883 ///  ::= .zerofill segname , sectname [, identifier , size_expression [
 884 ///      , align_expression ]]
 885 bool DarwinAsmParser::parseDirectiveZerofill(StringRef, SMLoc) {
 886   StringRef Segment;
 887   if (getParser().parseIdentifier(Segment))
 888     return TokError("expected segment name after '.zerofill' directive");
 889
 890   if (getLexer().isNot(AsmToken::Comma))
 891     return TokError("unexpected token in directive");
 892   Lex();
 893
 894   StringRef Section;
 895   SMLoc SectionLoc = getLexer().getLoc();
 896   if (getParser().parseIdentifier(Section))
 897     return TokError("expected section name after comma in '.zerofill' "
 898                     "directive");
 899
 900   // If this is the end of the line all that was wanted was to create the
 901   // the section but with no symbol.
 902   if (getLexer().is(AsmToken::EndOfStatement)) {
 903     // Create the zerofill section but no symbol
 904     getStreamer().EmitZerofill(
 905         getContext().getMachOSection(Segment, Section, MachO::S_ZEROFILL, 0,
 906                                      SectionKind::getBSS()),
 907         /*Symbol=*/nullptr, /*Size=*/0, /*ByteAlignment=*/0, SectionLoc);
 908     return false;
 909   }
 910
 911   if (getLexer().isNot(AsmToken::Comma))
 912     return TokError("unexpected token in directive");
 913   Lex();
 914
 915   SMLoc IDLoc = getLexer().getLoc();
 916   StringRef IDStr;
 917   if (getParser().parseIdentifier(IDStr))
 918     return TokError("expected identifier in directive");
 919
 920   // handle the identifier as the key symbol.
 921   MCSymbol *Sym = getContext().getOrCreateSymbol(IDStr);
 922
 923   if (getLexer().isNot(AsmToken::Comma))
 924     return TokError("unexpected token in directive");
 925   Lex();
 926
 927   int64_t Size;
 928   SMLoc SizeLoc = getLexer().getLoc();
 929   if (getParser().parseAbsoluteExpression(Size))
 930     return true;
 931
 932   int64_t Pow2Alignment = 0;
 933   SMLoc Pow2AlignmentLoc;
 934   if (getLexer().is(AsmToken::Comma)) {
 935     Lex();
 936     Pow2AlignmentLoc = getLexer().getLoc();
 937     if (getParser().parseAbsoluteExpression(Pow2Alignment))
 938       return true;
 939   }
 940
 941   if (getLexer().isNot(AsmToken::EndOfStatement))
 942     return TokError("unexpected token in '.zerofill' directive");
 943
 944   Lex();
 945
 946   if (Size < 0)
 947     return Error(SizeLoc, "invalid '.zerofill' directive size, can't be less "
 948                  "than zero");
 949
 950   // NOTE: The alignment in the directive is a power of 2 value, the assembler
 951   // may internally end up wanting an alignment in bytes.
 952   // FIXME: Diagnose overflow.
 953   if (Pow2Alignment < 0)
 954     return Error(Pow2AlignmentLoc, "invalid '.zerofill' directive alignment, "
 955                  "can't be less than zero");
 956
 957   if (!Sym->isUndefined())
 958     return Error(IDLoc, "invalid symbol redefinition");
 959
 960   // Create the zerofill Symbol with Size and Pow2Alignment
 961   //
 962   // FIXME: Arch specific.
 963   getStreamer().EmitZerofill(getContext().getMachOSection(
 964                                Segment, Section, MachO::S_ZEROFILL,
 965                                0, SectionKind::getBSS()),
 966                              Sym, Size, 1 << Pow2Alignment, SectionLoc);
 967
 968   return false;
 969 }
 970
 971 /// ParseDirectiveDataRegion
 972 ///  ::= .data_region [ ( jt8 | jt16 | jt32 ) ]
 973 bool DarwinAsmParser::parseDirectiveDataRegion(StringRef, SMLoc) {
 974   if (getLexer().is(AsmToken::EndOfStatement)) {
 975     Lex();
 976     getStreamer().EmitDataRegion(MCDR_DataRegion);
 977     return false;
 978   }
 979   StringRef RegionType;
 980   SMLoc Loc = getParser().getTok().getLoc();
 981   if (getParser().parseIdentifier(RegionType))
 982     return TokError("expected region type after '.data_region' directive");
 983   int Kind = StringSwitch<int>(RegionType)
 984     .Case("jt8", MCDR_DataRegionJT8)
 985     .Case("jt16", MCDR_DataRegionJT16)
 986     .Case("jt32", MCDR_DataRegionJT32)
 987     .Default(-1);
 988   if (Kind == -1)
 989     return Error(Loc, "unknown region type in '.data_region' directive");
 990   Lex();
 991
 992   getStreamer().EmitDataRegion((MCDataRegionType)Kind);
 993   return false;
 994 }
 995
 996 /// ParseDirectiveDataRegionEnd
 997 ///  ::= .end_data_region
 998 bool DarwinAsmParser::parseDirectiveDataRegionEnd(StringRef, SMLoc) {
 999   if (getLexer().isNot(AsmToken::EndOfStatement))
1000     return TokError("unexpected token in '.end_data_region' directive");
1001
1002   Lex();
1003   getStreamer().EmitDataRegion(MCDR_DataRegionEnd);
1004   return false;
1005 }
1006
1007 static bool isSDKVersionToken(const AsmToken &Tok) {
1008   return Tok.is(AsmToken::Identifier) && Tok.getIdentifier() == "sdk_version";
1009 }
1010
1011 /// parseMajorMinorVersionComponent ::= major, minor
1012 bool DarwinAsmParser::parseMajorMinorVersionComponent(unsigned *Major,
1013                                                       unsigned *Minor,
1014                                                       const char *VersionName) {
1015   // Get the major version number.
1016   if (getLexer().isNot(AsmToken::Integer))
1017     return TokError(Twine("invalid ") + VersionName +
1018                     " major version number, integer expected");
1019   int64_t MajorVal = getLexer().getTok().getIntVal();
1020   if (MajorVal > 65535 || MajorVal <= 0)
1021     return TokError(Twine("invalid ") + VersionName + " major version number");
1022   *Major = (unsigned)MajorVal;
1023   Lex();
1024   if (getLexer().isNot(AsmToken::Comma))
1025     return TokError(Twine(VersionName) +
1026                     " minor version number required, comma expected");
1027   Lex();
1028   // Get the minor version number.
1029   if (getLexer().isNot(AsmToken::Integer))
1030     return TokError(Twine("invalid ") + VersionName +
1031                     " minor version number, integer expected");
1032   int64_t MinorVal = getLexer().getTok().getIntVal();
1033   if (MinorVal > 255 || MinorVal < 0)
1034     return TokError(Twine("invalid ") + VersionName + " minor version number");
1035   *Minor = MinorVal;
1036   Lex();
1037   return false;
1038 }
1039
1040 /// parseOptionalTrailingVersionComponent ::= , version_number
1041 bool DarwinAsmParser::parseOptionalTrailingVersionComponent(
1042     unsigned *Component, const char *ComponentName) {
1043   assert(getLexer().is(AsmToken::Comma) && "comma expected");
1044   Lex();
1045   if (getLexer().isNot(AsmToken::Integer))
1046     return TokError(Twine("invalid ") + ComponentName +
1047                     " version number, integer expected");
1048   int64_t Val = getLexer().getTok().getIntVal();
1049   if (Val > 255 || Val < 0)
1050     return TokError(Twine("invalid ") + ComponentName + " version number");
1051   *Component = Val;
1052   Lex();
1053   return false;
1054 }
1055
1056 /// parseVersion ::= parseMajorMinorVersionComponent
1057 ///                      parseOptionalTrailingVersionComponent
1058 bool DarwinAsmParser::parseVersion(unsigned *Major, unsigned *Minor,
1059                                    unsigned *Update) {
1060   if (parseMajorMinorVersionComponent(Major, Minor, "OS"))
1061     return true;
1062
1063   // Get the update level, if specified
1064   *Update = 0;
1065   if (getLexer().is(AsmToken::EndOfStatement) ||
1066       isSDKVersionToken(getLexer().getTok()))
1067     return false;
1068   if (getLexer().isNot(AsmToken::Comma))
1069     return TokError("invalid OS update specifier, comma expected");
1070   if (parseOptionalTrailingVersionComponent(Update, "OS update"))
1071     return true;
1072   return false;
1073 }
1074
1075 bool DarwinAsmParser::parseSDKVersion(VersionTuple &SDKVersion) {
1076   assert(isSDKVersionToken(getLexer().getTok()) && "expected sdk_version");
1077   Lex();
1078   unsigned Major, Minor;
1079   if (parseMajorMinorVersionComponent(&Major, &Minor, "SDK"))
1080     return true;
1081   SDKVersion = VersionTuple(Major, Minor);
1082
1083   // Get the subminor version, if specified.
1084   if (getLexer().is(AsmToken::Comma)) {
1085     unsigned Subminor;
1086     if (parseOptionalTrailingVersionComponent(&Subminor, "SDK subminor"))
1087       return true;
1088     SDKVersion = VersionTuple(Major, Minor, Subminor);
1089   }
1090   return false;
1091 }
1092
1093 void DarwinAsmParser::checkVersion(StringRef Directive, StringRef Arg,
1094                                    SMLoc Loc, Triple::OSType ExpectedOS) {
1095   const Triple &Target = getContext().getObjectFileInfo()->getTargetTriple();
1096   if (Target.getOS() != ExpectedOS)
1097     Warning(Loc, Twine(Directive) +
1098             (Arg.empty() ? Twine() : Twine(' ') + Arg) +
1099             " used while targeting " + Target.getOSName());
1100
1101   if (LastVersionDirective.isValid()) {
1102     Warning(Loc, "overriding previous version directive");
1103     Note(LastVersionDirective, "previous definition is here");
1104   }
1105   LastVersionDirective = Loc;
1106 }
1107
1108 static Triple::OSType getOSTypeFromMCVM(MCVersionMinType Type) {
1109   switch (Type) {
1110   case MCVM_WatchOSVersionMin: return Triple::WatchOS;
1111   case MCVM_TvOSVersionMin:    return Triple::TvOS;
1112   case MCVM_IOSVersionMin:     return Triple::IOS;
1113   case MCVM_OSXVersionMin:     return Triple::MacOSX;
1114   }
1115   llvm_unreachable("Invalid mc version min type");
1116 }
1117
1118 /// parseVersionMin
1119 ///   ::= .ios_version_min parseVersion parseSDKVersion
1120 ///   |   .macosx_version_min parseVersion parseSDKVersion
1121 ///   |   .tvos_version_min parseVersion parseSDKVersion
1122 ///   |   .watchos_version_min parseVersion parseSDKVersion
1123 bool DarwinAsmParser::parseVersionMin(StringRef Directive, SMLoc Loc,
1124                                       MCVersionMinType Type) {
1125   unsigned Major;
1126   unsigned Minor;
1127   unsigned Update;
1128   if (parseVersion(&Major, &Minor, &Update))
1129     return true;
1130
1131   VersionTuple SDKVersion;
1132   if (isSDKVersionToken(getLexer().getTok()) && parseSDKVersion(SDKVersion))
1133     return true;
1134
1135   if (parseToken(AsmToken::EndOfStatement))
1136     return addErrorSuffix(Twine(" in '") + Directive + "' directive");
1137
1138   Triple::OSType ExpectedOS = getOSTypeFromMCVM(Type);
1139   checkVersion(Directive, StringRef(), Loc, ExpectedOS);
1140   getStreamer().EmitVersionMin(Type, Major, Minor, Update, SDKVersion);
1141   return false;
1142 }
1143
1144 static Triple::OSType getOSTypeFromPlatform(MachO::PlatformType Type) {
1145   switch (Type) {
1146   case MachO::PLATFORM_MACOS:   return Triple::MacOSX;
1147   case MachO::PLATFORM_IOS:     return Triple::IOS;
1148   case MachO::PLATFORM_TVOS:    return Triple::TvOS;
1149   case MachO::PLATFORM_WATCHOS: return Triple::WatchOS;
1150   case MachO::PLATFORM_BRIDGEOS:         /* silence warning */ break;
1151   case MachO::PLATFORM_MACCATALYST: return Triple::IOS;
1152   case MachO::PLATFORM_IOSSIMULATOR:     /* silence warning */ break;
1153   case MachO::PLATFORM_TVOSSIMULATOR:    /* silence warning */ break;
1154   case MachO::PLATFORM_WATCHOSSIMULATOR: /* silence warning */ break;
1155   }
1156   llvm_unreachable("Invalid mach-o platform type");
1157 }
1158
1159 /// parseBuildVersion
1160 ///   ::= .build_version (macos|ios|tvos|watchos), parseVersion parseSDKVersion
1161 bool DarwinAsmParser::parseBuildVersion(StringRef Directive, SMLoc Loc) {
1162   StringRef PlatformName;
1163   SMLoc PlatformLoc = getTok().getLoc();
1164   if (getParser().parseIdentifier(PlatformName))
1165     return TokError("platform name expected");
1166
1167   unsigned Platform = StringSwitch<unsigned>(PlatformName)
1168     .Case("macos", MachO::PLATFORM_MACOS)
1169     .Case("ios", MachO::PLATFORM_IOS)
1170     .Case("tvos", MachO::PLATFORM_TVOS)
1171     .Case("watchos", MachO::PLATFORM_WATCHOS)
1172     .Case("macCatalyst", MachO::PLATFORM_MACCATALYST)
1173     .Default(0);
1174   if (Platform == 0)
1175     return Error(PlatformLoc, "unknown platform name");
1176
1177   if (getLexer().isNot(AsmToken::Comma))
1178     return TokError("version number required, comma expected");
1179   Lex();
1180
1181   unsigned Major;
1182   unsigned Minor;
1183   unsigned Update;
1184   if (parseVersion(&Major, &Minor, &Update))
1185     return true;
1186
1187   VersionTuple SDKVersion;
1188   if (isSDKVersionToken(getLexer().getTok()) && parseSDKVersion(SDKVersion))
1189     return true;
1190
1191   if (parseToken(AsmToken::EndOfStatement))
1192     return addErrorSuffix(" in '.build_version' directive");
1193
1194   Triple::OSType ExpectedOS
1195     = getOSTypeFromPlatform((MachO::PlatformType)Platform);
1196   checkVersion(Directive, PlatformName, Loc, ExpectedOS);
1197   getStreamer().EmitBuildVersion(Platform, Major, Minor, Update, SDKVersion);
1198   return false;
1199 }
1200
1201
1202 namespace llvm {
1203
1204 MCAsmParserExtension *createDarwinAsmParser() {
1205   return new DarwinAsmParser;
1206 }
1207
1208 } // end llvm namespace