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