src/llvm/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/ADT/StringRef.h"
  12 #include "llvm/ADT/StringSwitch.h"
  13 #include "llvm/ADT/Twine.h"
  14 #include "llvm/MC/MCContext.h"
  15 #include "llvm/MC/MCParser/MCAsmLexer.h"
  16 #include "llvm/MC/MCParser/MCAsmParser.h"
  17 #include "llvm/MC/MCSectionMachO.h"
  18 #include "llvm/MC/MCStreamer.h"
  19 #include "llvm/MC/MCSymbol.h"
  20 #include "llvm/Support/MemoryBuffer.h"
  21 #include "llvm/Support/SourceMgr.h"
  22 using namespace llvm;
  23
  24 namespace {
  25
  26 /// \brief Implementation of directive handling which is shared across all
  27 /// Darwin targets.
  28 class DarwinAsmParser : public MCAsmParserExtension {
  29   template<bool (DarwinAsmParser::*HandlerMethod)(StringRef, SMLoc)>
  30   void addDirectiveHandler(StringRef Directive) {
  31     MCAsmParser::ExtensionDirectiveHandler Handler = std::make_pair(
  32         this, HandleDirective<DarwinAsmParser, HandlerMethod>);
  33     getParser().addDirectiveHandler(Directive, Handler);
  34   }
  35
  36   bool ParseSectionSwitch(const char *Segment, const char *Section,
  37                           unsigned TAA = 0, unsigned ImplicitAlign = 0,
  38                           unsigned StubSize = 0);
  39
  40 public:
  41   DarwinAsmParser() {}
  42
  43   virtual void Initialize(MCAsmParser &Parser) {
  44     // Call the base implementation.
  45     this->MCAsmParserExtension::Initialize(Parser);
  46
  47     addDirectiveHandler<&DarwinAsmParser::ParseDirectiveDesc>(".desc");
  48     addDirectiveHandler<&DarwinAsmParser::ParseDirectiveLsym>(".lsym");
  49     addDirectiveHandler<&DarwinAsmParser::ParseDirectiveSubsectionsViaSymbols>(
  50       ".subsections_via_symbols");
  51     addDirectiveHandler<&DarwinAsmParser::ParseDirectiveDumpOrLoad>(".dump");
  52     addDirectiveHandler<&DarwinAsmParser::ParseDirectiveDumpOrLoad>(".load");
  53     addDirectiveHandler<&DarwinAsmParser::ParseDirectiveSection>(".section");
  54     addDirectiveHandler<&DarwinAsmParser::ParseDirectivePushSection>(
  55       ".pushsection");
  56     addDirectiveHandler<&DarwinAsmParser::ParseDirectivePopSection>(
  57       ".popsection");
  58     addDirectiveHandler<&DarwinAsmParser::ParseDirectivePrevious>(".previous");
  59     addDirectiveHandler<&DarwinAsmParser::ParseDirectiveSecureLogUnique>(
  60       ".secure_log_unique");
  61     addDirectiveHandler<&DarwinAsmParser::ParseDirectiveSecureLogReset>(
  62       ".secure_log_reset");
  63     addDirectiveHandler<&DarwinAsmParser::ParseDirectiveTBSS>(".tbss");
  64     addDirectiveHandler<&DarwinAsmParser::ParseDirectiveZerofill>(".zerofill");
  65
  66     addDirectiveHandler<&DarwinAsmParser::ParseDirectiveDataRegion>(
  67       ".data_region");
  68     addDirectiveHandler<&DarwinAsmParser::ParseDirectiveDataRegionEnd>(
  69       ".end_data_region");
  70
  71     // Special section directives.
  72     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveConst>(".const");
  73     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveConstData>(
  74       ".const_data");
  75     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveConstructor>(
  76       ".constructor");
  77     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveCString>(
  78       ".cstring");
  79     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveData>(".data");
  80     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveDestructor>(
  81       ".destructor");
  82     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveDyld>(".dyld");
  83     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveFVMLibInit0>(
  84       ".fvmlib_init0");
  85     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveFVMLibInit1>(
  86       ".fvmlib_init1");
  87     addDirectiveHandler<
  88       &DarwinAsmParser::ParseSectionDirectiveLazySymbolPointers>(
  89         ".lazy_symbol_pointer");
  90     addDirectiveHandler<&DarwinAsmParser::ParseDirectiveLinkerOption>(
  91       ".linker_option");
  92     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveLiteral16>(
  93       ".literal16");
  94     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveLiteral4>(
  95       ".literal4");
  96     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveLiteral8>(
  97       ".literal8");
  98     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveModInitFunc>(
  99       ".mod_init_func");
 100     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveModTermFunc>(
 101       ".mod_term_func");
 102     addDirectiveHandler<
 103       &DarwinAsmParser::ParseSectionDirectiveNonLazySymbolPointers>(
 104         ".non_lazy_symbol_pointer");
 105     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCCatClsMeth>(
 106       ".objc_cat_cls_meth");
 107     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCCatInstMeth>(
 108       ".objc_cat_inst_meth");
 109     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCCategory>(
 110       ".objc_category");
 111     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCClass>(
 112       ".objc_class");
 113     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCClassNames>(
 114       ".objc_class_names");
 115     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCClassVars>(
 116       ".objc_class_vars");
 117     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCClsMeth>(
 118       ".objc_cls_meth");
 119     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCClsRefs>(
 120       ".objc_cls_refs");
 121     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCInstMeth>(
 122       ".objc_inst_meth");
 123     addDirectiveHandler<
 124       &DarwinAsmParser::ParseSectionDirectiveObjCInstanceVars>(
 125         ".objc_instance_vars");
 126     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCMessageRefs>(
 127       ".objc_message_refs");
 128     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCMetaClass>(
 129       ".objc_meta_class");
 130     addDirectiveHandler<
 131       &DarwinAsmParser::ParseSectionDirectiveObjCMethVarNames>(
 132         ".objc_meth_var_names");
 133     addDirectiveHandler<
 134       &DarwinAsmParser::ParseSectionDirectiveObjCMethVarTypes>(
 135         ".objc_meth_var_types");
 136     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCModuleInfo>(
 137       ".objc_module_info");
 138     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCProtocol>(
 139       ".objc_protocol");
 140     addDirectiveHandler<
 141       &DarwinAsmParser::ParseSectionDirectiveObjCSelectorStrs>(
 142         ".objc_selector_strs");
 143     addDirectiveHandler<
 144       &DarwinAsmParser::ParseSectionDirectiveObjCStringObject>(
 145         ".objc_string_object");
 146     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCSymbols>(
 147       ".objc_symbols");
 148     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectivePICSymbolStub>(
 149       ".picsymbol_stub");
 150     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveStaticConst>(
 151       ".static_const");
 152     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveStaticData>(
 153       ".static_data");
 154     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveSymbolStub>(
 155       ".symbol_stub");
 156     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveTData>(".tdata");
 157     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveText>(".text");
 158     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveThreadInitFunc>(
 159       ".thread_init_func");
 160     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveTLV>(".tlv");
 161
 162     addDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveIdent>(".ident");
 163   }
 164
 165   bool ParseDirectiveDesc(StringRef, SMLoc);
 166   bool ParseDirectiveDumpOrLoad(StringRef, SMLoc);
 167   bool ParseDirectiveLsym(StringRef, SMLoc);
 168   bool ParseDirectiveLinkerOption(StringRef, SMLoc);
 169   bool ParseDirectiveSection(StringRef, SMLoc);
 170   bool ParseDirectivePushSection(StringRef, SMLoc);
 171   bool ParseDirectivePopSection(StringRef, SMLoc);
 172   bool ParseDirectivePrevious(StringRef, SMLoc);
 173   bool ParseDirectiveSecureLogReset(StringRef, SMLoc);
 174   bool ParseDirectiveSecureLogUnique(StringRef, SMLoc);
 175   bool ParseDirectiveSubsectionsViaSymbols(StringRef, SMLoc);
 176   bool ParseDirectiveTBSS(StringRef, SMLoc);
 177   bool ParseDirectiveZerofill(StringRef, SMLoc);
 178   bool ParseDirectiveDataRegion(StringRef, SMLoc);
 179   bool ParseDirectiveDataRegionEnd(StringRef, SMLoc);
 180
 181   // Named Section Directive
 182   bool ParseSectionDirectiveConst(StringRef, SMLoc) {
 183     return ParseSectionSwitch("__TEXT", "__const");
 184   }
 185   bool ParseSectionDirectiveStaticConst(StringRef, SMLoc) {
 186     return ParseSectionSwitch("__TEXT", "__static_const");
 187   }
 188   bool ParseSectionDirectiveCString(StringRef, SMLoc) {
 189     return ParseSectionSwitch("__TEXT","__cstring",
 190                               MCSectionMachO::S_CSTRING_LITERALS);
 191   }
 192   bool ParseSectionDirectiveLiteral4(StringRef, SMLoc) {
 193     return ParseSectionSwitch("__TEXT", "__literal4",
 194                               MCSectionMachO::S_4BYTE_LITERALS, 4);
 195   }
 196   bool ParseSectionDirectiveLiteral8(StringRef, SMLoc) {
 197     return ParseSectionSwitch("__TEXT", "__literal8",
 198                               MCSectionMachO::S_8BYTE_LITERALS, 8);
 199   }
 200   bool ParseSectionDirectiveLiteral16(StringRef, SMLoc) {
 201     return ParseSectionSwitch("__TEXT","__literal16",
 202                               MCSectionMachO::S_16BYTE_LITERALS, 16);
 203   }
 204   bool ParseSectionDirectiveConstructor(StringRef, SMLoc) {
 205     return ParseSectionSwitch("__TEXT","__constructor");
 206   }
 207   bool ParseSectionDirectiveDestructor(StringRef, SMLoc) {
 208     return ParseSectionSwitch("__TEXT","__destructor");
 209   }
 210   bool ParseSectionDirectiveFVMLibInit0(StringRef, SMLoc) {
 211     return ParseSectionSwitch("__TEXT","__fvmlib_init0");
 212   }
 213   bool ParseSectionDirectiveFVMLibInit1(StringRef, SMLoc) {
 214     return ParseSectionSwitch("__TEXT","__fvmlib_init1");
 215   }
 216   bool ParseSectionDirectiveSymbolStub(StringRef, SMLoc) {
 217     return ParseSectionSwitch("__TEXT","__symbol_stub",
 218                               MCSectionMachO::S_SYMBOL_STUBS |
 219                               MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
 220                               // FIXME: Different on PPC and ARM.
 221                               0, 16);
 222   }
 223   bool ParseSectionDirectivePICSymbolStub(StringRef, SMLoc) {
 224     return ParseSectionSwitch("__TEXT","__picsymbol_stub",
 225                               MCSectionMachO::S_SYMBOL_STUBS |
 226                               MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, 0, 26);
 227   }
 228   bool ParseSectionDirectiveData(StringRef, SMLoc) {
 229     return ParseSectionSwitch("__DATA", "__data");
 230   }
 231   bool ParseSectionDirectiveStaticData(StringRef, SMLoc) {
 232     return ParseSectionSwitch("__DATA", "__static_data");
 233   }
 234   bool ParseSectionDirectiveNonLazySymbolPointers(StringRef, SMLoc) {
 235     return ParseSectionSwitch("__DATA", "__nl_symbol_ptr",
 236                               MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS, 4);
 237   }
 238   bool ParseSectionDirectiveLazySymbolPointers(StringRef, SMLoc) {
 239     return ParseSectionSwitch("__DATA", "__la_symbol_ptr",
 240                               MCSectionMachO::S_LAZY_SYMBOL_POINTERS, 4);
 241   }
 242   bool ParseSectionDirectiveDyld(StringRef, SMLoc) {
 243     return ParseSectionSwitch("__DATA", "__dyld");
 244   }
 245   bool ParseSectionDirectiveModInitFunc(StringRef, SMLoc) {
 246     return ParseSectionSwitch("__DATA", "__mod_init_func",
 247                               MCSectionMachO::S_MOD_INIT_FUNC_POINTERS, 4);
 248   }
 249   bool ParseSectionDirectiveModTermFunc(StringRef, SMLoc) {
 250     return ParseSectionSwitch("__DATA", "__mod_term_func",
 251                               MCSectionMachO::S_MOD_TERM_FUNC_POINTERS, 4);
 252   }
 253   bool ParseSectionDirectiveConstData(StringRef, SMLoc) {
 254     return ParseSectionSwitch("__DATA", "__const");
 255   }
 256   bool ParseSectionDirectiveObjCClass(StringRef, SMLoc) {
 257     return ParseSectionSwitch("__OBJC", "__class",
 258                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 259   }
 260   bool ParseSectionDirectiveObjCMetaClass(StringRef, SMLoc) {
 261     return ParseSectionSwitch("__OBJC", "__meta_class",
 262                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 263   }
 264   bool ParseSectionDirectiveObjCCatClsMeth(StringRef, SMLoc) {
 265     return ParseSectionSwitch("__OBJC", "__cat_cls_meth",
 266                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 267   }
 268   bool ParseSectionDirectiveObjCCatInstMeth(StringRef, SMLoc) {
 269     return ParseSectionSwitch("__OBJC", "__cat_inst_meth",
 270                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 271   }
 272   bool ParseSectionDirectiveObjCProtocol(StringRef, SMLoc) {
 273     return ParseSectionSwitch("__OBJC", "__protocol",
 274                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 275   }
 276   bool ParseSectionDirectiveObjCStringObject(StringRef, SMLoc) {
 277     return ParseSectionSwitch("__OBJC", "__string_object",
 278                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 279   }
 280   bool ParseSectionDirectiveObjCClsMeth(StringRef, SMLoc) {
 281     return ParseSectionSwitch("__OBJC", "__cls_meth",
 282                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 283   }
 284   bool ParseSectionDirectiveObjCInstMeth(StringRef, SMLoc) {
 285     return ParseSectionSwitch("__OBJC", "__inst_meth",
 286                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 287   }
 288   bool ParseSectionDirectiveObjCClsRefs(StringRef, SMLoc) {
 289     return ParseSectionSwitch("__OBJC", "__cls_refs",
 290                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP |
 291                               MCSectionMachO::S_LITERAL_POINTERS, 4);
 292   }
 293   bool ParseSectionDirectiveObjCMessageRefs(StringRef, SMLoc) {
 294     return ParseSectionSwitch("__OBJC", "__message_refs",
 295                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP |
 296                               MCSectionMachO::S_LITERAL_POINTERS, 4);
 297   }
 298   bool ParseSectionDirectiveObjCSymbols(StringRef, SMLoc) {
 299     return ParseSectionSwitch("__OBJC", "__symbols",
 300                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 301   }
 302   bool ParseSectionDirectiveObjCCategory(StringRef, SMLoc) {
 303     return ParseSectionSwitch("__OBJC", "__category",
 304                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 305   }
 306   bool ParseSectionDirectiveObjCClassVars(StringRef, SMLoc) {
 307     return ParseSectionSwitch("__OBJC", "__class_vars",
 308                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 309   }
 310   bool ParseSectionDirectiveObjCInstanceVars(StringRef, SMLoc) {
 311     return ParseSectionSwitch("__OBJC", "__instance_vars",
 312                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 313   }
 314   bool ParseSectionDirectiveObjCModuleInfo(StringRef, SMLoc) {
 315     return ParseSectionSwitch("__OBJC", "__module_info",
 316                               MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
 317   }
 318   bool ParseSectionDirectiveObjCClassNames(StringRef, SMLoc) {
 319     return ParseSectionSwitch("__TEXT", "__cstring",
 320                               MCSectionMachO::S_CSTRING_LITERALS);
 321   }
 322   bool ParseSectionDirectiveObjCMethVarTypes(StringRef, SMLoc) {
 323     return ParseSectionSwitch("__TEXT", "__cstring",
 324                               MCSectionMachO::S_CSTRING_LITERALS);
 325   }
 326   bool ParseSectionDirectiveObjCMethVarNames(StringRef, SMLoc) {
 327     return ParseSectionSwitch("__TEXT", "__cstring",
 328                               MCSectionMachO::S_CSTRING_LITERALS);
 329   }
 330   bool ParseSectionDirectiveObjCSelectorStrs(StringRef, SMLoc) {
 331     return ParseSectionSwitch("__OBJC", "__selector_strs",
 332                               MCSectionMachO::S_CSTRING_LITERALS);
 333   }
 334   bool ParseSectionDirectiveTData(StringRef, SMLoc) {
 335     return ParseSectionSwitch("__DATA", "__thread_data",
 336                               MCSectionMachO::S_THREAD_LOCAL_REGULAR);
 337   }
 338   bool ParseSectionDirectiveText(StringRef, SMLoc) {
 339     return ParseSectionSwitch("__TEXT", "__text",
 340                               MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS);
 341   }
 342   bool ParseSectionDirectiveTLV(StringRef, SMLoc) {
 343     return ParseSectionSwitch("__DATA", "__thread_vars",
 344                               MCSectionMachO::S_THREAD_LOCAL_VARIABLES);
 345   }
 346   bool ParseSectionDirectiveIdent(StringRef, SMLoc) {
 347     // Darwin silently ignores the .ident directive.
 348     getParser().eatToEndOfStatement();
 349     return false;
 350   }
 351   bool ParseSectionDirectiveThreadInitFunc(StringRef, SMLoc) {
 352     return ParseSectionSwitch("__DATA", "__thread_init",
 353                          MCSectionMachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS);
 354   }
 355
 356 };
 357
 358 } // end anonymous namespace
 359
 360 bool DarwinAsmParser::ParseSectionSwitch(const char *Segment,
 361                                          const char *Section,
 362                                          unsigned TAA, unsigned Align,
 363                                          unsigned StubSize) {
 364   if (getLexer().isNot(AsmToken::EndOfStatement))
 365     return TokError("unexpected token in section switching directive");
 366   Lex();
 367
 368   // FIXME: Arch specific.
 369   bool isText = TAA & MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS;
 370   getStreamer().SwitchSection(getContext().getMachOSection(
 371                                 Segment, Section, TAA, StubSize,
 372                                 isText ? SectionKind::getText()
 373                                        : SectionKind::getDataRel()));
 374
 375   // Set the implicit alignment, if any.
 376   //
 377   // FIXME: This isn't really what 'as' does; I think it just uses the implicit
 378   // alignment on the section (e.g., if one manually inserts bytes into the
 379   // section, then just issuing the section switch directive will not realign
 380   // the section. However, this is arguably more reasonable behavior, and there
 381   // is no good reason for someone to intentionally emit incorrectly sized
 382   // values into the implicitly aligned sections.
 383   if (Align)
 384     getStreamer().EmitValueToAlignment(Align, 0, 1, 0);
 385
 386   return false;
 387 }
 388
 389 /// ParseDirectiveDesc
 390 ///  ::= .desc identifier , expression
 391 bool DarwinAsmParser::ParseDirectiveDesc(StringRef, SMLoc) {
 392   StringRef Name;
 393   if (getParser().parseIdentifier(Name))
 394     return TokError("expected identifier in directive");
 395
 396   // Handle the identifier as the key symbol.
 397   MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
 398
 399   if (getLexer().isNot(AsmToken::Comma))
 400     return TokError("unexpected token in '.desc' directive");
 401   Lex();
 402
 403   int64_t DescValue;
 404   if (getParser().parseAbsoluteExpression(DescValue))
 405     return true;
 406
 407   if (getLexer().isNot(AsmToken::EndOfStatement))
 408     return TokError("unexpected token in '.desc' directive");
 409
 410   Lex();
 411
 412   // Set the n_desc field of this Symbol to this DescValue
 413   getStreamer().EmitSymbolDesc(Sym, DescValue);
 414
 415   return false;
 416 }
 417
 418 /// ParseDirectiveDumpOrLoad
 419 ///  ::= ( .dump | .load ) "filename"
 420 bool DarwinAsmParser::ParseDirectiveDumpOrLoad(StringRef Directive,
 421                                                SMLoc IDLoc) {
 422   bool IsDump = Directive == ".dump";
 423   if (getLexer().isNot(AsmToken::String))
 424     return TokError("expected string in '.dump' or '.load' directive");
 425
 426   Lex();
 427
 428   if (getLexer().isNot(AsmToken::EndOfStatement))
 429     return TokError("unexpected token in '.dump' or '.load' directive");
 430
 431   Lex();
 432
 433   // FIXME: If/when .dump and .load are implemented they will be done in the
 434   // the assembly parser and not have any need for an MCStreamer API.
 435   if (IsDump)
 436     return Warning(IDLoc, "ignoring directive .dump for now");
 437   else
 438     return Warning(IDLoc, "ignoring directive .load for now");
 439 }
 440
 441 /// ParseDirectiveLinkerOption
 442 ///  ::= .linker_option "string" ( , "string" )*
 443 bool DarwinAsmParser::ParseDirectiveLinkerOption(StringRef IDVal, SMLoc) {
 444   SmallVector<std::string, 4> Args;
 445   for (;;) {
 446     if (getLexer().isNot(AsmToken::String))
 447       return TokError("expected string in '" + Twine(IDVal) + "' directive");
 448
 449     std::string Data;
 450     if (getParser().parseEscapedString(Data))
 451       return true;
 452
 453     Args.push_back(Data);
 454
 455     Lex();
 456     if (getLexer().is(AsmToken::EndOfStatement))
 457       break;
 458
 459     if (getLexer().isNot(AsmToken::Comma))
 460       return TokError("unexpected token in '" + Twine(IDVal) + "' directive");
 461     Lex();
 462   }
 463
 464   getStreamer().EmitLinkerOptions(Args);
 465   return false;
 466 }
 467
 468 /// ParseDirectiveLsym
 469 ///  ::= .lsym identifier , expression
 470 bool DarwinAsmParser::ParseDirectiveLsym(StringRef, SMLoc) {
 471   StringRef Name;
 472   if (getParser().parseIdentifier(Name))
 473     return TokError("expected identifier in directive");
 474
 475   // Handle the identifier as the key symbol.
 476   MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
 477
 478   if (getLexer().isNot(AsmToken::Comma))
 479     return TokError("unexpected token in '.lsym' directive");
 480   Lex();
 481
 482   const MCExpr *Value;
 483   if (getParser().parseExpression(Value))
 484     return true;
 485
 486   if (getLexer().isNot(AsmToken::EndOfStatement))
 487     return TokError("unexpected token in '.lsym' directive");
 488
 489   Lex();
 490
 491   // We don't currently support this directive.
 492   //
 493   // FIXME: Diagnostic location!
 494   (void) Sym;
 495   return TokError("directive '.lsym' is unsupported");
 496 }
 497
 498 /// ParseDirectiveSection:
 499 ///   ::= .section identifier (',' identifier)*
 500 bool DarwinAsmParser::ParseDirectiveSection(StringRef, SMLoc) {
 501   SMLoc Loc = getLexer().getLoc();
 502
 503   StringRef SectionName;
 504   if (getParser().parseIdentifier(SectionName))
 505     return Error(Loc, "expected identifier after '.section' directive");
 506
 507   // Verify there is a following comma.
 508   if (!getLexer().is(AsmToken::Comma))
 509     return TokError("unexpected token in '.section' directive");
 510
 511   std::string SectionSpec = SectionName;
 512   SectionSpec += ",";
 513
 514   // Add all the tokens until the end of the line, ParseSectionSpecifier will
 515   // handle this.
 516   StringRef EOL = getLexer().LexUntilEndOfStatement();
 517   SectionSpec.append(EOL.begin(), EOL.end());
 518
 519   Lex();
 520   if (getLexer().isNot(AsmToken::EndOfStatement))
 521     return TokError("unexpected token in '.section' directive");
 522   Lex();
 523
 524
 525   StringRef Segment, Section;
 526   unsigned StubSize;
 527   unsigned TAA;
 528   bool TAAParsed;
 529   std::string ErrorStr =
 530     MCSectionMachO::ParseSectionSpecifier(SectionSpec, Segment, Section,
 531                                           TAA, TAAParsed, StubSize);
 532
 533   if (!ErrorStr.empty())
 534     return Error(Loc, ErrorStr.c_str());
 535
 536   // FIXME: Arch specific.
 537   bool isText = Segment == "__TEXT";  // FIXME: Hack.
 538   getStreamer().SwitchSection(getContext().getMachOSection(
 539                                 Segment, Section, TAA, StubSize,
 540                                 isText ? SectionKind::getText()
 541                                 : SectionKind::getDataRel()));
 542   return false;
 543 }
 544
 545 /// ParseDirectivePushSection:
 546 ///   ::= .pushsection identifier (',' identifier)*
 547 bool DarwinAsmParser::ParseDirectivePushSection(StringRef S, SMLoc Loc) {
 548   getStreamer().PushSection();
 549
 550   if (ParseDirectiveSection(S, Loc)) {
 551     getStreamer().PopSection();
 552     return true;
 553   }
 554
 555   return false;
 556 }
 557
 558 /// ParseDirectivePopSection:
 559 ///   ::= .popsection
 560 bool DarwinAsmParser::ParseDirectivePopSection(StringRef, SMLoc) {
 561   if (!getStreamer().PopSection())
 562     return TokError(".popsection without corresponding .pushsection");
 563   return false;
 564 }
 565
 566 /// ParseDirectivePrevious:
 567 ///   ::= .previous
 568 bool DarwinAsmParser::ParseDirectivePrevious(StringRef DirName, SMLoc) {
 569   const MCSection *PreviousSection = getStreamer().getPreviousSection();
 570   if (PreviousSection == NULL)
 571       return TokError(".previous without corresponding .section");
 572   getStreamer().SwitchSection(PreviousSection);
 573   return false;
 574 }
 575
 576 /// ParseDirectiveSecureLogUnique
 577 ///  ::= .secure_log_unique ... message ...
 578 bool DarwinAsmParser::ParseDirectiveSecureLogUnique(StringRef, SMLoc IDLoc) {
 579   StringRef LogMessage = getParser().parseStringToEndOfStatement();
 580   if (getLexer().isNot(AsmToken::EndOfStatement))
 581     return TokError("unexpected token in '.secure_log_unique' directive");
 582
 583   if (getContext().getSecureLogUsed() != false)
 584     return Error(IDLoc, ".secure_log_unique specified multiple times");
 585
 586   // Get the secure log path.
 587   const char *SecureLogFile = getContext().getSecureLogFile();
 588   if (SecureLogFile == NULL)
 589     return Error(IDLoc, ".secure_log_unique used but AS_SECURE_LOG_FILE "
 590                  "environment variable unset.");
 591
 592   // Open the secure log file if we haven't already.
 593   raw_ostream *OS = getContext().getSecureLog();
 594   if (OS == NULL) {
 595     std::string Err;
 596     OS = new raw_fd_ostream(SecureLogFile, Err, raw_fd_ostream::F_Append);
 597     if (!Err.empty()) {
 598        delete OS;
 599        return Error(IDLoc, Twine("can't open secure log file: ") +
 600                     SecureLogFile + " (" + Err + ")");
 601     }
 602     getContext().setSecureLog(OS);
 603   }
 604
 605   // Write the message.
 606   int CurBuf = getSourceManager().FindBufferContainingLoc(IDLoc);
 607   *OS << getSourceManager().getBufferInfo(CurBuf).Buffer->getBufferIdentifier()
 608       << ":" << getSourceManager().FindLineNumber(IDLoc, CurBuf) << ":"
 609       << LogMessage + "\n";
 610
 611   getContext().setSecureLogUsed(true);
 612
 613   return false;
 614 }
 615
 616 /// ParseDirectiveSecureLogReset
 617 ///  ::= .secure_log_reset
 618 bool DarwinAsmParser::ParseDirectiveSecureLogReset(StringRef, SMLoc IDLoc) {
 619   if (getLexer().isNot(AsmToken::EndOfStatement))
 620     return TokError("unexpected token in '.secure_log_reset' directive");
 621
 622   Lex();
 623
 624   getContext().setSecureLogUsed(false);
 625
 626   return false;
 627 }
 628
 629 /// ParseDirectiveSubsectionsViaSymbols
 630 ///  ::= .subsections_via_symbols
 631 bool DarwinAsmParser::ParseDirectiveSubsectionsViaSymbols(StringRef, SMLoc) {
 632   if (getLexer().isNot(AsmToken::EndOfStatement))
 633     return TokError("unexpected token in '.subsections_via_symbols' directive");
 634
 635   Lex();
 636
 637   getStreamer().EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
 638
 639   return false;
 640 }
 641
 642 /// ParseDirectiveTBSS
 643 ///  ::= .tbss identifier, size, align
 644 bool DarwinAsmParser::ParseDirectiveTBSS(StringRef, SMLoc) {
 645   SMLoc IDLoc = getLexer().getLoc();
 646   StringRef Name;
 647   if (getParser().parseIdentifier(Name))
 648     return TokError("expected identifier in directive");
 649
 650   // Handle the identifier as the key symbol.
 651   MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
 652
 653   if (getLexer().isNot(AsmToken::Comma))
 654     return TokError("unexpected token in directive");
 655   Lex();
 656
 657   int64_t Size;
 658   SMLoc SizeLoc = getLexer().getLoc();
 659   if (getParser().parseAbsoluteExpression(Size))
 660     return true;
 661
 662   int64_t Pow2Alignment = 0;
 663   SMLoc Pow2AlignmentLoc;
 664   if (getLexer().is(AsmToken::Comma)) {
 665     Lex();
 666     Pow2AlignmentLoc = getLexer().getLoc();
 667     if (getParser().parseAbsoluteExpression(Pow2Alignment))
 668       return true;
 669   }
 670
 671   if (getLexer().isNot(AsmToken::EndOfStatement))
 672     return TokError("unexpected token in '.tbss' directive");
 673
 674   Lex();
 675
 676   if (Size < 0)
 677     return Error(SizeLoc, "invalid '.tbss' directive size, can't be less than"
 678                  "zero");
 679
 680   // FIXME: Diagnose overflow.
 681   if (Pow2Alignment < 0)
 682     return Error(Pow2AlignmentLoc, "invalid '.tbss' alignment, can't be less"
 683                  "than zero");
 684
 685   if (!Sym->isUndefined())
 686     return Error(IDLoc, "invalid symbol redefinition");
 687
 688   getStreamer().EmitTBSSSymbol(getContext().getMachOSection(
 689                                  "__DATA", "__thread_bss",
 690                                  MCSectionMachO::S_THREAD_LOCAL_ZEROFILL,
 691                                  0, SectionKind::getThreadBSS()),
 692                                Sym, Size, 1 << Pow2Alignment);
 693
 694   return false;
 695 }
 696
 697 /// ParseDirectiveZerofill
 698 ///  ::= .zerofill segname , sectname [, identifier , size_expression [
 699 ///      , align_expression ]]
 700 bool DarwinAsmParser::ParseDirectiveZerofill(StringRef, SMLoc) {
 701   StringRef Segment;
 702   if (getParser().parseIdentifier(Segment))
 703     return TokError("expected segment name after '.zerofill' directive");
 704
 705   if (getLexer().isNot(AsmToken::Comma))
 706     return TokError("unexpected token in directive");
 707   Lex();
 708
 709   StringRef Section;
 710   if (getParser().parseIdentifier(Section))
 711     return TokError("expected section name after comma in '.zerofill' "
 712                     "directive");
 713
 714   // If this is the end of the line all that was wanted was to create the
 715   // the section but with no symbol.
 716   if (getLexer().is(AsmToken::EndOfStatement)) {
 717     // Create the zerofill section but no symbol
 718     getStreamer().EmitZerofill(getContext().getMachOSection(
 719                                  Segment, Section, MCSectionMachO::S_ZEROFILL,
 720                                  0, SectionKind::getBSS()));
 721     return false;
 722   }
 723
 724   if (getLexer().isNot(AsmToken::Comma))
 725     return TokError("unexpected token in directive");
 726   Lex();
 727
 728   SMLoc IDLoc = getLexer().getLoc();
 729   StringRef IDStr;
 730   if (getParser().parseIdentifier(IDStr))
 731     return TokError("expected identifier in directive");
 732
 733   // handle the identifier as the key symbol.
 734   MCSymbol *Sym = getContext().GetOrCreateSymbol(IDStr);
 735
 736   if (getLexer().isNot(AsmToken::Comma))
 737     return TokError("unexpected token in directive");
 738   Lex();
 739
 740   int64_t Size;
 741   SMLoc SizeLoc = getLexer().getLoc();
 742   if (getParser().parseAbsoluteExpression(Size))
 743     return true;
 744
 745   int64_t Pow2Alignment = 0;
 746   SMLoc Pow2AlignmentLoc;
 747   if (getLexer().is(AsmToken::Comma)) {
 748     Lex();
 749     Pow2AlignmentLoc = getLexer().getLoc();
 750     if (getParser().parseAbsoluteExpression(Pow2Alignment))
 751       return true;
 752   }
 753
 754   if (getLexer().isNot(AsmToken::EndOfStatement))
 755     return TokError("unexpected token in '.zerofill' directive");
 756
 757   Lex();
 758
 759   if (Size < 0)
 760     return Error(SizeLoc, "invalid '.zerofill' directive size, can't be less "
 761                  "than zero");
 762
 763   // NOTE: The alignment in the directive is a power of 2 value, the assembler
 764   // may internally end up wanting an alignment in bytes.
 765   // FIXME: Diagnose overflow.
 766   if (Pow2Alignment < 0)
 767     return Error(Pow2AlignmentLoc, "invalid '.zerofill' directive alignment, "
 768                  "can't be less than zero");
 769
 770   if (!Sym->isUndefined())
 771     return Error(IDLoc, "invalid symbol redefinition");
 772
 773   // Create the zerofill Symbol with Size and Pow2Alignment
 774   //
 775   // FIXME: Arch specific.
 776   getStreamer().EmitZerofill(getContext().getMachOSection(
 777                                Segment, Section, MCSectionMachO::S_ZEROFILL,
 778                                0, SectionKind::getBSS()),
 779                              Sym, Size, 1 << Pow2Alignment);
 780
 781   return false;
 782 }
 783
 784 /// ParseDirectiveDataRegion
 785 ///  ::= .data_region [ ( jt8 | jt16 | jt32 ) ]
 786 bool DarwinAsmParser::ParseDirectiveDataRegion(StringRef, SMLoc) {
 787   if (getLexer().is(AsmToken::EndOfStatement)) {
 788     Lex();
 789     getStreamer().EmitDataRegion(MCDR_DataRegion);
 790     return false;
 791   }
 792   StringRef RegionType;
 793   SMLoc Loc = getParser().getTok().getLoc();
 794   if (getParser().parseIdentifier(RegionType))
 795     return TokError("expected region type after '.data_region' directive");
 796   int Kind = StringSwitch<int>(RegionType)
 797     .Case("jt8", MCDR_DataRegionJT8)
 798     .Case("jt16", MCDR_DataRegionJT16)
 799     .Case("jt32", MCDR_DataRegionJT32)
 800     .Default(-1);
 801   if (Kind == -1)
 802     return Error(Loc, "unknown region type in '.data_region' directive");
 803   Lex();
 804
 805   getStreamer().EmitDataRegion((MCDataRegionType)Kind);
 806   return false;
 807 }
 808
 809 /// ParseDirectiveDataRegionEnd
 810 ///  ::= .end_data_region
 811 bool DarwinAsmParser::ParseDirectiveDataRegionEnd(StringRef, SMLoc) {
 812   if (getLexer().isNot(AsmToken::EndOfStatement))
 813     return TokError("unexpected token in '.end_data_region' directive");
 814
 815   Lex();
 816   getStreamer().EmitDataRegion(MCDR_DataRegionEnd);
 817   return false;
 818 }
 819
 820 namespace llvm {
 821
 822 MCAsmParserExtension *createDarwinAsmParser() {
 823   return new DarwinAsmParser;
 824 }
 825
 826 } // end llvm namespace