lib/MC/MCParser/DarwinAsmParser.cpp

   1 //===- DarwinAsmParser.cpp - Darwin (Mach-O) Assembly Parser --------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "llvm/MC/MCParser/MCAsmParserExtension.h"
  11 #include "llvm/MC/MCContext.h"
  12 #include "llvm/MC/MCSectionMachO.h"
  13 #include "llvm/MC/MCStreamer.h"
  14 #include "llvm/MC/MCSymbol.h"
  15 #include "llvm/MC/MCParser/MCAsmLexer.h"
  16 #include "llvm/MC/MCParser/MCAsmParser.h"
  17 #include "llvm/ADT/StringRef.h"
  18 #include "llvm/ADT/Twine.h"
  19 #include "llvm/Support/MemoryBuffer.h"
  20 #include "llvm/Support/SourceMgr.h"
  21 using namespace llvm;
  22
  23 namespace {
  24
  25 /// \brief Implementation of directive handling which is shared across all
  26 /// Darwin targets.
  27 class DarwinAsmParser : public MCAsmParserExtension {
  28   template<bool (DarwinAsmParser::*Handler)(StringRef, SMLoc)>
  29   void AddDirectiveHandler(StringRef Directive) {
  30     getParser().AddDirectiveHandler(this, Directive,
  31                                     HandleDirective<DarwinAsmParser, Handler>);
  32   }
  33
  34   bool ParseSectionSwitch(const char *Segment, const char *Section,
  35                           unsigned TAA = 0, unsigned ImplicitAlign = 0,
  36                           unsigned StubSize = 0);
  37
  38 public:
  39   DarwinAsmParser() {}
  40
  41   virtual void Initialize(MCAsmParser &Parser) {
  42     // Call the base implementation.
  43     this->MCAsmParserExtension::Initialize(Parser);
  44
  45     AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveDesc>(".desc");
  46     AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveLsym>(".lsym");
  47     AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveSubsectionsViaSymbols>(
  48       ".subsections_via_symbols");
  49     AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveDumpOrLoad>(".dump");
  50     AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveDumpOrLoad>(".load");
  51     AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveSection>(".section");
  52     AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveSecureLogUnique>(
  53       ".secure_log_unique");
  54     AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveSecureLogReset>(
  55       ".secure_log_reset");
  56     AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveTBSS>(".tbss");
  57     AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveZerofill>(".zerofill");
  58
  59     // Special section directives.
  60     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveConst>(".const");
  61     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveConstData>(".const_data");
  62     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveConstructor>(".constructor");
  63     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveCString>(".cstring");
  64     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveData>(".data");
  65     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveDestructor>(".destructor");
  66     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveDyld>(".dyld");
  67     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveFVMLibInit0>(".fvmlib_init0");
  68     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveFVMLibInit1>(".fvmlib_init1");
  69     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveLazySymbolPointers>(".lazy_symbol_pointer");
  70     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveLiteral16>(".literal16");
  71     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveLiteral4>(".literal4");
  72     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveLiteral8>(".literal8");
  73     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveModInitFunc>(".mod_init_func");
  74     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveModTermFunc>(".mod_term_func");
  75     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveNonLazySymbolPointers>(".non_lazy_symbol_pointer");
  76     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCCatClsMeth>(".objc_cat_cls_meth");
  77     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCCatInstMeth>(".objc_cat_inst_meth");
  78     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCCategory>(".objc_category");
  79     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCClass>(".objc_class");
  80     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCClassNames>(".objc_class_names");
  81     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCClassVars>(".objc_class_vars");
  82     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCClsMeth>(".objc_cls_meth");
  83     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCClsRefs>(".objc_cls_refs");
  84     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCInstMeth>(".objc_inst_meth");
  85     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCInstanceVars>(".objc_instance_vars");
  86     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCMessageRefs>(".objc_message_refs");
  87     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCMetaClass>(".objc_meta_class");
  88     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCMethVarNames>(".objc_meth_var_names");
  89     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCMethVarTypes>(".objc_meth_var_types");
  90     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCModuleInfo>(".objc_module_info");
  91     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCProtocol>(".objc_protocol");
  92     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCSelectorStrs>(".objc_selector_strs");
  93     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCStringObject>(".objc_string_object");
  94     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCSymbols>(".objc_symbols");
  95     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectivePICSymbolStub>(".picsymbol_stub");
  96     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveStaticConst>(".static_const");
  97     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveStaticData>(".static_data");
  98     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveSymbolStub>(".symbol_stub");
  99     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveTData>(".tdata");
 100     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveText>(".text");
 101     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveThreadInitFunc>(".thread_init_func");
 102     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveTLV>(".tlv");
 103
 104     AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveIdent>(".ident");
 105   }
 106
 107   bool ParseDirectiveDesc(StringRef, SMLoc);
 108   bool ParseDirectiveDumpOrLoad(StringRef, SMLoc);
 109   bool ParseDirectiveLsym(StringRef, SMLoc);
 110   bool ParseDirectiveSection(StringRef, SMLoc);
 111   bool ParseDirectiveSecureLogReset(StringRef, SMLoc);
 112   bool ParseDirectiveSecureLogUnique(StringRef, SMLoc);
 113   bool ParseDirectiveSubsectionsViaSymbols(StringRef, SMLoc);
 114   bool ParseDirectiveTBSS(StringRef, SMLoc);
 115   bool ParseDirectiveZerofill(StringRef, SMLoc);
 116
 117   // Named Section Directive
 118   bool ParseSectionDirectiveConst(StringRef, SMLoc) {
 119     return ParseSectionSwitch("__TEXT", "__const");
 120   }
 121   bool ParseSectionDirectiveStaticConst(StringRef, SMLoc) {
 122     return ParseSectionSwitch("__TEXT", "__static_const");
 123   }
 124   bool ParseSectionDirectiveCString(StringRef, SMLoc) {
 125     return ParseSectionSwitch("__TEXT","__cstring",
 126                               MCSectionMachO::S_CSTRING_LITERALS);
 127   }
 128   bool ParseSectionDirectiveLiteral4(StringRef, SMLoc) {
 129     return ParseSectionSwitch("__TEXT", "__literal4",
 130                               MCSectionMachO::S_4BYTE_LITERALS, 4);
 131   }
 132   bool ParseSectionDirectiveLiteral8(StringRef, SMLoc) {
 133     return ParseSectionSwitch("__TEXT", "__literal8",
 134                               MCSectionMachO::S_8BYTE_LITERALS, 8);
 135   }
 136   bool ParseSectionDirectiveLiteral16(StringRef, SMLoc) {
 137     return ParseSectionSwitch("__TEXT","__literal16",
 138                               MCSectionMachO::S_16BYTE_LITERALS, 16);
 139   }
 140   bool ParseSectionDirectiveConstructor(StringRef, SMLoc) {
 141     return ParseSectionSwitch("__TEXT","__constructor");
 142   }
 143   bool ParseSectionDirectiveDestructor(StringRef, SMLoc) {
 144     return ParseSectionSwitch("__TEXT","__destructor");
 145   }
 146   bool ParseSectionDirectiveFVMLibInit0(StringRef, SMLoc) {
 147     return ParseSectionSwitch("__TEXT","__fvmlib_init0");
 148   }
 149   bool ParseSectionDirectiveFVMLibInit1(StringRef, SMLoc) {
 150     return ParseSectionSwitch("__TEXT","__fvmlib_init1");
 151   }
 152   bool ParseSectionDirectiveSymbolStub(StringRef, SMLoc) {
 153     return ParseSectionSwitch("__TEXT","__symbol_stub",
 154                               MCSectionMachO::S_SYMBOL_STUBS |
 155                               MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
 156                               // FIXME: Different on PPC and ARM.
 157                               0, 16);
 158   }
 159   bool ParseSectionDirectivePICSymbolStub(StringRef, SMLoc) {
 160     return ParseSectionSwitch("__TEXT","__picsymbol_stub",
 161                               MCSectionMachO::S_SYMBOL_STUBS |
 162                               MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, 0, 26);
 163   }
 164   bool ParseSectionDirectiveData(StringRef, SMLoc) {
 165     return ParseSectionSwitch("__DATA", "__data");
 166   }
 167   bool ParseSectionDirectiveStaticData(StringRef, SMLoc) {
 168     return ParseSectionSwitch("__DATA", "__static_data");
 169   }
 170   bool ParseSectionDirectiveNonLazySymbolPointers(StringRef, SMLoc) {
 171     return ParseSectionSwitch("__DATA", "__nl_symbol_ptr",
 172                               MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS, 4);
 173   }
 174   bool ParseSectionDirectiveLazySymbolPointers(StringRef, SMLoc) {
 175     return ParseSectionSwitch("__DATA", "__la_symbol_ptr",
 176                               MCSectionMachO::S_LAZY_SYMBOL_POINTERS, 4);
 177   }
 178   bool ParseSectionDirectiveDyld(StringRef, SMLoc) {
 179     return ParseSectionSwitch("__DATA", "__dyld");
 180   }
 181   bool ParseSectionDirectiveModInitFunc(StringRef, SMLoc) {
 182     return ParseSectionSwitch("__DATA", "__mod_init_func",
 183                               MCSectionMachO::S_MOD_INIT_FUNC_POINTERS, 4);
 184   }
 185   bool ParseSectionDirectiveModTermFunc(StringRef, SMLoc) {
 186     return ParseSectionSwitch("__DATA", "__mod_term_func",
 187                               MCSectionMachO::S_MOD_TERM_FUNC_POINTERS, 4);
 188   }
 189   bool ParseSectionDirectiveConstData(StringRef, SMLoc) {
 190     return ParseSectionSwitch("__DATA", "__const");
 191   }
 192   bool ParseSectionDirectiveObjCClass(StringRef, SMLoc) {
 193     return ParseSectionSwitch("__OBJC", "__class",
 194                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 195   }
 196   bool ParseSectionDirectiveObjCMetaClass(StringRef, SMLoc) {
 197     return ParseSectionSwitch("__OBJC", "__meta_class",
 198                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 199   }
 200   bool ParseSectionDirectiveObjCCatClsMeth(StringRef, SMLoc) {
 201     return ParseSectionSwitch("__OBJC", "__cat_cls_meth",
 202                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 203   }
 204   bool ParseSectionDirectiveObjCCatInstMeth(StringRef, SMLoc) {
 205     return ParseSectionSwitch("__OBJC", "__cat_inst_meth",
 206                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 207   }
 208   bool ParseSectionDirectiveObjCProtocol(StringRef, SMLoc) {
 209     return ParseSectionSwitch("__OBJC", "__protocol",
 210                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 211   }
 212   bool ParseSectionDirectiveObjCStringObject(StringRef, SMLoc) {
 213     return ParseSectionSwitch("__OBJC", "__string_object",
 214                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 215   }
 216   bool ParseSectionDirectiveObjCClsMeth(StringRef, SMLoc) {
 217     return ParseSectionSwitch("__OBJC", "__cls_meth",
 218                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 219   }
 220   bool ParseSectionDirectiveObjCInstMeth(StringRef, SMLoc) {
 221     return ParseSectionSwitch("__OBJC", "__inst_meth",
 222                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 223   }
 224   bool ParseSectionDirectiveObjCClsRefs(StringRef, SMLoc) {
 225     return ParseSectionSwitch("__OBJC", "__cls_refs",
 226                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP |
 227                               MCSectionMachO::S_LITERAL_POINTERS, 4);
 228   }
 229   bool ParseSectionDirectiveObjCMessageRefs(StringRef, SMLoc) {
 230     return ParseSectionSwitch("__OBJC", "__message_refs",
 231                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP |
 232                               MCSectionMachO::S_LITERAL_POINTERS, 4);
 233   }
 234   bool ParseSectionDirectiveObjCSymbols(StringRef, SMLoc) {
 235     return ParseSectionSwitch("__OBJC", "__symbols",
 236                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 237   }
 238   bool ParseSectionDirectiveObjCCategory(StringRef, SMLoc) {
 239     return ParseSectionSwitch("__OBJC", "__category",
 240                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 241   }
 242   bool ParseSectionDirectiveObjCClassVars(StringRef, SMLoc) {
 243     return ParseSectionSwitch("__OBJC", "__class_vars",
 244                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 245   }
 246   bool ParseSectionDirectiveObjCInstanceVars(StringRef, SMLoc) {
 247     return ParseSectionSwitch("__OBJC", "__instance_vars",
 248                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 249   }
 250   bool ParseSectionDirectiveObjCModuleInfo(StringRef, SMLoc) {
 251     return ParseSectionSwitch("__OBJC", "__module_info",
 252                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 253   }
 254   bool ParseSectionDirectiveObjCClassNames(StringRef, SMLoc) {
 255     return ParseSectionSwitch("__TEXT", "__cstring",
 256                               MCSectionMachO::S_CSTRING_LITERALS);
 257   }
 258   bool ParseSectionDirectiveObjCMethVarTypes(StringRef, SMLoc) {
 259     return ParseSectionSwitch("__TEXT", "__cstring",
 260                               MCSectionMachO::S_CSTRING_LITERALS);
 261   }
 262   bool ParseSectionDirectiveObjCMethVarNames(StringRef, SMLoc) {
 263     return ParseSectionSwitch("__TEXT", "__cstring",
 264                               MCSectionMachO::S_CSTRING_LITERALS);
 265   }
 266   bool ParseSectionDirectiveObjCSelectorStrs(StringRef, SMLoc) {
 267     return ParseSectionSwitch("__OBJC", "__selector_strs",
 268                               MCSectionMachO::S_CSTRING_LITERALS);
 269   }
 270   bool ParseSectionDirectiveTData(StringRef, SMLoc) {
 271     return ParseSectionSwitch("__DATA", "__thread_data",
 272                               MCSectionMachO::S_THREAD_LOCAL_REGULAR);
 273   }
 274   bool ParseSectionDirectiveText(StringRef, SMLoc) {
 275     return ParseSectionSwitch("__TEXT", "__text",
 276                               MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS);
 277   }
 278   bool ParseSectionDirectiveTLV(StringRef, SMLoc) {
 279     return ParseSectionSwitch("__DATA", "__thread_vars",
 280                               MCSectionMachO::S_THREAD_LOCAL_VARIABLES);
 281   }
 282   bool ParseSectionDirectiveIdent(StringRef, SMLoc) {
 283     // Darwin silently ignores the .ident directive.
 284     getParser().EatToEndOfStatement();
 285     return false;
 286   }
 287   bool ParseSectionDirectiveThreadInitFunc(StringRef, SMLoc) {
 288     return ParseSectionSwitch("__DATA", "__thread_init",
 289                          MCSectionMachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS);
 290   }
 291
 292 };
 293
 294 }
 295
 296 bool DarwinAsmParser::ParseSectionSwitch(const char *Segment,
 297                                          const char *Section,
 298                                          unsigned TAA, unsigned Align,
 299                                          unsigned StubSize) {
 300   if (getLexer().isNot(AsmToken::EndOfStatement))
 301     return TokError("unexpected token in section switching directive");
 302   Lex();
 303
 304   // FIXME: Arch specific.
 305   bool isText = StringRef(Segment) == "__TEXT";  // FIXME: Hack.
 306   getStreamer().SwitchSection(getContext().getMachOSection(
 307                                 Segment, Section, TAA, StubSize,
 308                                 isText ? SectionKind::getText()
 309                                        : SectionKind::getDataRel()));
 310
 311   // Set the implicit alignment, if any.
 312   //
 313   // FIXME: This isn't really what 'as' does; I think it just uses the implicit
 314   // alignment on the section (e.g., if one manually inserts bytes into the
 315   // section, then just issuing the section switch directive will not realign
 316   // the section. However, this is arguably more reasonable behavior, and there
 317   // is no good reason for someone to intentionally emit incorrectly sized
 318   // values into the implicitly aligned sections.
 319   if (Align)
 320     getStreamer().EmitValueToAlignment(Align, 0, 1, 0);
 321
 322   return false;
 323 }
 324
 325 /// ParseDirectiveDesc
 326 ///  ::= .desc identifier , expression
 327 bool DarwinAsmParser::ParseDirectiveDesc(StringRef, SMLoc) {
 328   StringRef Name;
 329   if (getParser().ParseIdentifier(Name))
 330     return TokError("expected identifier in directive");
 331
 332   // Handle the identifier as the key symbol.
 333   MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
 334
 335   if (getLexer().isNot(AsmToken::Comma))
 336     return TokError("unexpected token in '.desc' directive");
 337   Lex();
 338
 339   int64_t DescValue;
 340   if (getParser().ParseAbsoluteExpression(DescValue))
 341     return true;
 342
 343   if (getLexer().isNot(AsmToken::EndOfStatement))
 344     return TokError("unexpected token in '.desc' directive");
 345
 346   Lex();
 347
 348   // Set the n_desc field of this Symbol to this DescValue
 349   getStreamer().EmitSymbolDesc(Sym, DescValue);
 350
 351   return false;
 352 }
 353
 354 /// ParseDirectiveDumpOrLoad
 355 ///  ::= ( .dump | .load ) "filename"
 356 bool DarwinAsmParser::ParseDirectiveDumpOrLoad(StringRef Directive,
 357                                                SMLoc IDLoc) {
 358   bool IsDump = Directive == ".dump";
 359   if (getLexer().isNot(AsmToken::String))
 360     return TokError("expected string in '.dump' or '.load' directive");
 361
 362   Lex();
 363
 364   if (getLexer().isNot(AsmToken::EndOfStatement))
 365     return TokError("unexpected token in '.dump' or '.load' directive");
 366
 367   Lex();
 368
 369   // FIXME: If/when .dump and .load are implemented they will be done in the
 370   // the assembly parser and not have any need for an MCStreamer API.
 371   if (IsDump)
 372     return Warning(IDLoc, "ignoring directive .dump for now");
 373   else
 374     return Warning(IDLoc, "ignoring directive .load for now");
 375 }
 376
 377 /// ParseDirectiveLsym
 378 ///  ::= .lsym identifier , expression
 379 bool DarwinAsmParser::ParseDirectiveLsym(StringRef, SMLoc) {
 380   StringRef Name;
 381   if (getParser().ParseIdentifier(Name))
 382     return TokError("expected identifier in directive");
 383
 384   // Handle the identifier as the key symbol.
 385   MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
 386
 387   if (getLexer().isNot(AsmToken::Comma))
 388     return TokError("unexpected token in '.lsym' directive");
 389   Lex();
 390
 391   const MCExpr *Value;
 392   if (getParser().ParseExpression(Value))
 393     return true;
 394
 395   if (getLexer().isNot(AsmToken::EndOfStatement))
 396     return TokError("unexpected token in '.lsym' directive");
 397
 398   Lex();
 399
 400   // We don't currently support this directive.
 401   //
 402   // FIXME: Diagnostic location!
 403   (void) Sym;
 404   return TokError("directive '.lsym' is unsupported");
 405 }
 406
 407 /// ParseDirectiveSection:
 408 ///   ::= .section identifier (',' identifier)*
 409 bool DarwinAsmParser::ParseDirectiveSection(StringRef, SMLoc) {
 410   SMLoc Loc = getLexer().getLoc();
 411
 412   StringRef SectionName;
 413   if (getParser().ParseIdentifier(SectionName))
 414     return Error(Loc, "expected identifier after '.section' directive");
 415
 416   // Verify there is a following comma.
 417   if (!getLexer().is(AsmToken::Comma))
 418     return TokError("unexpected token in '.section' directive");
 419
 420   std::string SectionSpec = SectionName;
 421   SectionSpec += ",";
 422
 423   // Add all the tokens until the end of the line, ParseSectionSpecifier will
 424   // handle this.
 425   StringRef EOL = getLexer().LexUntilEndOfStatement();
 426   SectionSpec.append(EOL.begin(), EOL.end());
 427
 428   Lex();
 429   if (getLexer().isNot(AsmToken::EndOfStatement))
 430     return TokError("unexpected token in '.section' directive");
 431   Lex();
 432
 433
 434   StringRef Segment, Section;
 435   unsigned StubSize;
 436   unsigned TAA;
 437   bool TAAParsed;
 438   std::string ErrorStr =
 439     MCSectionMachO::ParseSectionSpecifier(SectionSpec, Segment, Section,
 440                                           TAA, TAAParsed, StubSize);
 441
 442   if (!ErrorStr.empty())
 443     return Error(Loc, ErrorStr.c_str());
 444
 445   // FIXME: Arch specific.
 446   bool isText = Segment == "__TEXT";  // FIXME: Hack.
 447   getStreamer().SwitchSection(getContext().getMachOSection(
 448                                 Segment, Section, TAA, StubSize,
 449                                 isText ? SectionKind::getText()
 450                                 : SectionKind::getDataRel()));
 451   return false;
 452 }
 453
 454 /// ParseDirectiveSecureLogUnique
 455 ///  ::= .secure_log_unique ... message ...
 456 bool DarwinAsmParser::ParseDirectiveSecureLogUnique(StringRef, SMLoc IDLoc) {
 457   StringRef LogMessage = getParser().ParseStringToEndOfStatement();
 458   if (getLexer().isNot(AsmToken::EndOfStatement))
 459     return TokError("unexpected token in '.secure_log_unique' directive");
 460
 461   if (getContext().getSecureLogUsed() != false)
 462     return Error(IDLoc, ".secure_log_unique specified multiple times");
 463
 464   // Get the secure log path.
 465   const char *SecureLogFile = getContext().getSecureLogFile();
 466   if (SecureLogFile == NULL)
 467     return Error(IDLoc, ".secure_log_unique used but AS_SECURE_LOG_FILE "
 468                  "environment variable unset.");
 469
 470   // Open the secure log file if we haven't already.
 471   raw_ostream *OS = getContext().getSecureLog();
 472   if (OS == NULL) {
 473     std::string Err;
 474     OS = new raw_fd_ostream(SecureLogFile, Err, raw_fd_ostream::F_Append);
 475     if (!Err.empty()) {
 476        delete OS;
 477        return Error(IDLoc, Twine("can't open secure log file: ") +
 478                     SecureLogFile + " (" + Err + ")");
 479     }
 480     getContext().setSecureLog(OS);
 481   }
 482
 483   // Write the message.
 484   int CurBuf = getSourceManager().FindBufferContainingLoc(IDLoc);
 485   *OS << getSourceManager().getBufferInfo(CurBuf).Buffer->getBufferIdentifier()
 486       << ":" << getSourceManager().FindLineNumber(IDLoc, CurBuf) << ":"
 487       << LogMessage + "\n";
 488
 489   getContext().setSecureLogUsed(true);
 490
 491   return false;
 492 }
 493
 494 /// ParseDirectiveSecureLogReset
 495 ///  ::= .secure_log_reset
 496 bool DarwinAsmParser::ParseDirectiveSecureLogReset(StringRef, SMLoc IDLoc) {
 497   if (getLexer().isNot(AsmToken::EndOfStatement))
 498     return TokError("unexpected token in '.secure_log_reset' directive");
 499
 500   Lex();
 501
 502   getContext().setSecureLogUsed(false);
 503
 504   return false;
 505 }
 506
 507 /// ParseDirectiveSubsectionsViaSymbols
 508 ///  ::= .subsections_via_symbols
 509 bool DarwinAsmParser::ParseDirectiveSubsectionsViaSymbols(StringRef, SMLoc) {
 510   if (getLexer().isNot(AsmToken::EndOfStatement))
 511     return TokError("unexpected token in '.subsections_via_symbols' directive");
 512
 513   Lex();
 514
 515   getStreamer().EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
 516
 517   return false;
 518 }
 519
 520 /// ParseDirectiveTBSS
 521 ///  ::= .tbss identifier, size, align
 522 bool DarwinAsmParser::ParseDirectiveTBSS(StringRef, SMLoc) {
 523   SMLoc IDLoc = getLexer().getLoc();
 524   StringRef Name;
 525   if (getParser().ParseIdentifier(Name))
 526     return TokError("expected identifier in directive");
 527
 528   // Handle the identifier as the key symbol.
 529   MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
 530
 531   if (getLexer().isNot(AsmToken::Comma))
 532     return TokError("unexpected token in directive");
 533   Lex();
 534
 535   int64_t Size;
 536   SMLoc SizeLoc = getLexer().getLoc();
 537   if (getParser().ParseAbsoluteExpression(Size))
 538     return true;
 539
 540   int64_t Pow2Alignment = 0;
 541   SMLoc Pow2AlignmentLoc;
 542   if (getLexer().is(AsmToken::Comma)) {
 543     Lex();
 544     Pow2AlignmentLoc = getLexer().getLoc();
 545     if (getParser().ParseAbsoluteExpression(Pow2Alignment))
 546       return true;
 547   }
 548
 549   if (getLexer().isNot(AsmToken::EndOfStatement))
 550     return TokError("unexpected token in '.tbss' directive");
 551
 552   Lex();
 553
 554   if (Size < 0)
 555     return Error(SizeLoc, "invalid '.tbss' directive size, can't be less than"
 556                  "zero");
 557
 558   // FIXME: Diagnose overflow.
 559   if (Pow2Alignment < 0)
 560     return Error(Pow2AlignmentLoc, "invalid '.tbss' alignment, can't be less"
 561                  "than zero");
 562
 563   if (!Sym->isUndefined())
 564     return Error(IDLoc, "invalid symbol redefinition");
 565
 566   getStreamer().EmitTBSSSymbol(getContext().getMachOSection(
 567                                  "__DATA", "__thread_bss",
 568                                  MCSectionMachO::S_THREAD_LOCAL_ZEROFILL,
 569                                  0, SectionKind::getThreadBSS()),
 570                                Sym, Size, 1 << Pow2Alignment);
 571
 572   return false;
 573 }
 574
 575 /// ParseDirectiveZerofill
 576 ///  ::= .zerofill segname , sectname [, identifier , size_expression [
 577 ///      , align_expression ]]
 578 bool DarwinAsmParser::ParseDirectiveZerofill(StringRef, SMLoc) {
 579   StringRef Segment;
 580   if (getParser().ParseIdentifier(Segment))
 581     return TokError("expected segment name after '.zerofill' directive");
 582
 583   if (getLexer().isNot(AsmToken::Comma))
 584     return TokError("unexpected token in directive");
 585   Lex();
 586
 587   StringRef Section;
 588   if (getParser().ParseIdentifier(Section))
 589     return TokError("expected section name after comma in '.zerofill' "
 590                     "directive");
 591
 592   // If this is the end of the line all that was wanted was to create the
 593   // the section but with no symbol.
 594   if (getLexer().is(AsmToken::EndOfStatement)) {
 595     // Create the zerofill section but no symbol
 596     getStreamer().EmitZerofill(getContext().getMachOSection(
 597                                  Segment, Section, MCSectionMachO::S_ZEROFILL,
 598                                  0, SectionKind::getBSS()));
 599     return false;
 600   }
 601
 602   if (getLexer().isNot(AsmToken::Comma))
 603     return TokError("unexpected token in directive");
 604   Lex();
 605
 606   SMLoc IDLoc = getLexer().getLoc();
 607   StringRef IDStr;
 608   if (getParser().ParseIdentifier(IDStr))
 609     return TokError("expected identifier in directive");
 610
 611   // handle the identifier as the key symbol.
 612   MCSymbol *Sym = getContext().GetOrCreateSymbol(IDStr);
 613
 614   if (getLexer().isNot(AsmToken::Comma))
 615     return TokError("unexpected token in directive");
 616   Lex();
 617
 618   int64_t Size;
 619   SMLoc SizeLoc = getLexer().getLoc();
 620   if (getParser().ParseAbsoluteExpression(Size))
 621     return true;
 622
 623   int64_t Pow2Alignment = 0;
 624   SMLoc Pow2AlignmentLoc;
 625   if (getLexer().is(AsmToken::Comma)) {
 626     Lex();
 627     Pow2AlignmentLoc = getLexer().getLoc();
 628     if (getParser().ParseAbsoluteExpression(Pow2Alignment))
 629       return true;
 630   }
 631
 632   if (getLexer().isNot(AsmToken::EndOfStatement))
 633     return TokError("unexpected token in '.zerofill' directive");
 634
 635   Lex();
 636
 637   if (Size < 0)
 638     return Error(SizeLoc, "invalid '.zerofill' directive size, can't be less "
 639                  "than zero");
 640
 641   // NOTE: The alignment in the directive is a power of 2 value, the assembler
 642   // may internally end up wanting an alignment in bytes.
 643   // FIXME: Diagnose overflow.
 644   if (Pow2Alignment < 0)
 645     return Error(Pow2AlignmentLoc, "invalid '.zerofill' directive alignment, "
 646                  "can't be less than zero");
 647
 648   if (!Sym->isUndefined())
 649     return Error(IDLoc, "invalid symbol redefinition");
 650
 651   // Create the zerofill Symbol with Size and Pow2Alignment
 652   //
 653   // FIXME: Arch specific.
 654   getStreamer().EmitZerofill(getContext().getMachOSection(
 655                                Segment, Section, MCSectionMachO::S_ZEROFILL,
 656                                0, SectionKind::getBSS()),
 657                              Sym, Size, 1 << Pow2Alignment);
 658
 659   return false;
 660 }
 661
 662 namespace llvm {
 663
 664 MCAsmParserExtension *createDarwinAsmParser() {
 665   return new DarwinAsmParser;
 666 }
 667
 668 }