xref: /freebsd/contrib/llvm-project/llvm/lib/MC/MCParser/DarwinAsmParser.cpp (revision 85868e8a1daeaae7a0e48effb2ea2310ae3b02c6) 
1 //===- DarwinAsmParser.cpp - Darwin (Mach-O) Assembly Parser --------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "llvm/ADT/STLExtras.h"
10 #include "llvm/ADT/SmallVector.h"
11 #include "llvm/ADT/StringRef.h"
12 #include "llvm/ADT/StringSwitch.h"
13 #include "llvm/ADT/Triple.h"
14 #include "llvm/ADT/Twine.h"
15 #include "llvm/BinaryFormat/MachO.h"
16 #include "llvm/MC/MCContext.h"
17 #include "llvm/MC/MCDirectives.h"
18 #include "llvm/MC/MCObjectFileInfo.h"
19 #include "llvm/MC/MCParser/MCAsmLexer.h"
20 #include "llvm/MC/MCParser/MCAsmParser.h"
21 #include "llvm/MC/MCParser/MCAsmParserExtension.h"
22 #include "llvm/MC/MCSectionMachO.h"
23 #include "llvm/MC/MCStreamer.h"
24 #include "llvm/MC/MCSymbol.h"
25 #include "llvm/MC/SectionKind.h"
26 #include "llvm/Support/FileSystem.h"
27 #include "llvm/Support/MemoryBuffer.h"
28 #include "llvm/Support/SMLoc.h"
29 #include "llvm/Support/SourceMgr.h"
30 #include "llvm/Support/raw_ostream.h"
31 #include <algorithm>
32 #include <cstddef>
33 #include <cstdint>
34 #include <string>
35 #include <system_error>
36 #include <utility>
37 
38 using namespace llvm;
39 
40 namespace {
41 
42 /// Implementation of directive handling which is shared across all
43 /// Darwin targets.
44 class DarwinAsmParser : public MCAsmParserExtension {
45   template<bool (DarwinAsmParser::*HandlerMethod)(StringRef, SMLoc)>
46   void addDirectiveHandler(StringRef Directive) {
47     MCAsmParser::ExtensionDirectiveHandler Handler = std::make_pair(
48         this, HandleDirective<DarwinAsmParser, HandlerMethod>);
49     getParser().addDirectiveHandler(Directive, Handler);
50   }
51 
52   bool parseSectionSwitch(StringRef Segment, StringRef Section,
53                           unsigned TAA = 0, unsigned ImplicitAlign = 0,
54                           unsigned StubSize = 0);
55 
56   SMLoc LastVersionDirective;
57 
58 public:
59   DarwinAsmParser() = default;
60 
61   void Initialize(MCAsmParser &Parser) override {
62     // Call the base implementation.
63     this->MCAsmParserExtension::Initialize(Parser);
64 
65     addDirectiveHandler<&DarwinAsmParser::parseDirectiveAltEntry>(".alt_entry");
66     addDirectiveHandler<&DarwinAsmParser::parseDirectiveDesc>(".desc");
67     addDirectiveHandler<&DarwinAsmParser::parseDirectiveIndirectSymbol>(
68       ".indirect_symbol");
69     addDirectiveHandler<&DarwinAsmParser::parseDirectiveLsym>(".lsym");
70     addDirectiveHandler<&DarwinAsmParser::parseDirectiveSubsectionsViaSymbols>(
71       ".subsections_via_symbols");
72     addDirectiveHandler<&DarwinAsmParser::parseDirectiveDumpOrLoad>(".dump");
73     addDirectiveHandler<&DarwinAsmParser::parseDirectiveDumpOrLoad>(".load");
74     addDirectiveHandler<&DarwinAsmParser::parseDirectiveSection>(".section");
75     addDirectiveHandler<&DarwinAsmParser::parseDirectivePushSection>(
76       ".pushsection");
77     addDirectiveHandler<&DarwinAsmParser::parseDirectivePopSection>(
78       ".popsection");
79     addDirectiveHandler<&DarwinAsmParser::parseDirectivePrevious>(".previous");
80     addDirectiveHandler<&DarwinAsmParser::parseDirectiveSecureLogUnique>(
81       ".secure_log_unique");
82     addDirectiveHandler<&DarwinAsmParser::parseDirectiveSecureLogReset>(
83       ".secure_log_reset");
84     addDirectiveHandler<&DarwinAsmParser::parseDirectiveTBSS>(".tbss");
85     addDirectiveHandler<&DarwinAsmParser::parseDirectiveZerofill>(".zerofill");
86 
87     addDirectiveHandler<&DarwinAsmParser::parseDirectiveDataRegion>(
88       ".data_region");
89     addDirectiveHandler<&DarwinAsmParser::parseDirectiveDataRegionEnd>(
90       ".end_data_region");
91 
92     // Special section directives.
93     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveBss>(".bss");
94     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveConst>(".const");
95     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveConstData>(
96       ".const_data");
97     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveConstructor>(
98       ".constructor");
99     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveCString>(
100       ".cstring");
101     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveData>(".data");
102     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveDestructor>(
103       ".destructor");
104     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveDyld>(".dyld");
105     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveFVMLibInit0>(
106       ".fvmlib_init0");
107     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveFVMLibInit1>(
108       ".fvmlib_init1");
109     addDirectiveHandler<
110       &DarwinAsmParser::parseSectionDirectiveLazySymbolPointers>(
111         ".lazy_symbol_pointer");
112     addDirectiveHandler<&DarwinAsmParser::parseDirectiveLinkerOption>(
113       ".linker_option");
114     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveLiteral16>(
115       ".literal16");
116     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveLiteral4>(
117       ".literal4");
118     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveLiteral8>(
119       ".literal8");
120     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveModInitFunc>(
121       ".mod_init_func");
122     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveModTermFunc>(
123       ".mod_term_func");
124     addDirectiveHandler<
125       &DarwinAsmParser::parseSectionDirectiveNonLazySymbolPointers>(
126         ".non_lazy_symbol_pointer");
127     addDirectiveHandler<
128       &DarwinAsmParser::parseSectionDirectiveThreadLocalVariablePointers>(
129         ".thread_local_variable_pointer");
130     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCCatClsMeth>(
131       ".objc_cat_cls_meth");
132     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCCatInstMeth>(
133       ".objc_cat_inst_meth");
134     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCCategory>(
135       ".objc_category");
136     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCClass>(
137       ".objc_class");
138     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCClassNames>(
139       ".objc_class_names");
140     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCClassVars>(
141       ".objc_class_vars");
142     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCClsMeth>(
143       ".objc_cls_meth");
144     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCClsRefs>(
145       ".objc_cls_refs");
146     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCInstMeth>(
147       ".objc_inst_meth");
148     addDirectiveHandler<
149       &DarwinAsmParser::parseSectionDirectiveObjCInstanceVars>(
150         ".objc_instance_vars");
151     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCMessageRefs>(
152       ".objc_message_refs");
153     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCMetaClass>(
154       ".objc_meta_class");
155     addDirectiveHandler<
156       &DarwinAsmParser::parseSectionDirectiveObjCMethVarNames>(
157         ".objc_meth_var_names");
158     addDirectiveHandler<
159       &DarwinAsmParser::parseSectionDirectiveObjCMethVarTypes>(
160         ".objc_meth_var_types");
161     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCModuleInfo>(
162       ".objc_module_info");
163     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCProtocol>(
164       ".objc_protocol");
165     addDirectiveHandler<
166       &DarwinAsmParser::parseSectionDirectiveObjCSelectorStrs>(
167         ".objc_selector_strs");
168     addDirectiveHandler<
169       &DarwinAsmParser::parseSectionDirectiveObjCStringObject>(
170         ".objc_string_object");
171     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCSymbols>(
172       ".objc_symbols");
173     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectivePICSymbolStub>(
174       ".picsymbol_stub");
175     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveStaticConst>(
176       ".static_const");
177     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveStaticData>(
178       ".static_data");
179     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveSymbolStub>(
180       ".symbol_stub");
181     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveTData>(".tdata");
182     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveText>(".text");
183     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveThreadInitFunc>(
184       ".thread_init_func");
185     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveTLV>(".tlv");
186 
187     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveIdent>(".ident");
188     addDirectiveHandler<&DarwinAsmParser::parseWatchOSVersionMin>(
189       ".watchos_version_min");
190     addDirectiveHandler<&DarwinAsmParser::parseTvOSVersionMin>(
191       ".tvos_version_min");
192     addDirectiveHandler<&DarwinAsmParser::parseIOSVersionMin>(
193       ".ios_version_min");
194     addDirectiveHandler<&DarwinAsmParser::parseMacOSXVersionMin>(
195       ".macosx_version_min");
196     addDirectiveHandler<&DarwinAsmParser::parseBuildVersion>(".build_version");
197 
198     LastVersionDirective = SMLoc();
199   }
200 
201   bool parseDirectiveAltEntry(StringRef, SMLoc);
202   bool parseDirectiveDesc(StringRef, SMLoc);
203   bool parseDirectiveIndirectSymbol(StringRef, SMLoc);
204   bool parseDirectiveDumpOrLoad(StringRef, SMLoc);
205   bool parseDirectiveLsym(StringRef, SMLoc);
206   bool parseDirectiveLinkerOption(StringRef, SMLoc);
207   bool parseDirectiveSection(StringRef, SMLoc);
208   bool parseDirectivePushSection(StringRef, SMLoc);
209   bool parseDirectivePopSection(StringRef, SMLoc);
210   bool parseDirectivePrevious(StringRef, SMLoc);
211   bool parseDirectiveSecureLogReset(StringRef, SMLoc);
212   bool parseDirectiveSecureLogUnique(StringRef, SMLoc);
213   bool parseDirectiveSubsectionsViaSymbols(StringRef, SMLoc);
214   bool parseDirectiveTBSS(StringRef, SMLoc);
215   bool parseDirectiveZerofill(StringRef, SMLoc);
216   bool parseDirectiveDataRegion(StringRef, SMLoc);
217   bool parseDirectiveDataRegionEnd(StringRef, SMLoc);
218 
219   // Named Section Directive
220   bool parseSectionDirectiveBss(StringRef, SMLoc) {
221     return parseSectionSwitch("__DATA", "__bss");
222   }
223 
224   bool parseSectionDirectiveConst(StringRef, SMLoc) {
225     return parseSectionSwitch("__TEXT", "__const");
226   }
227 
228   bool parseSectionDirectiveStaticConst(StringRef, SMLoc) {
229     return parseSectionSwitch("__TEXT", "__static_const");
230   }
231 
232   bool parseSectionDirectiveCString(StringRef, SMLoc) {
233     return parseSectionSwitch("__TEXT","__cstring",
234                               MachO::S_CSTRING_LITERALS);
235   }
236 
237   bool parseSectionDirectiveLiteral4(StringRef, SMLoc) {
238     return parseSectionSwitch("__TEXT", "__literal4",
239                               MachO::S_4BYTE_LITERALS, 4);
240   }
241 
242   bool parseSectionDirectiveLiteral8(StringRef, SMLoc) {
243     return parseSectionSwitch("__TEXT", "__literal8",
244                               MachO::S_8BYTE_LITERALS, 8);
245   }
246 
247   bool parseSectionDirectiveLiteral16(StringRef, SMLoc) {
248     return parseSectionSwitch("__TEXT","__literal16",
249                               MachO::S_16BYTE_LITERALS, 16);
250   }
251 
252   bool parseSectionDirectiveConstructor(StringRef, SMLoc) {
253     return parseSectionSwitch("__TEXT","__constructor");
254   }
255 
256   bool parseSectionDirectiveDestructor(StringRef, SMLoc) {
257     return parseSectionSwitch("__TEXT","__destructor");
258   }
259 
260   bool parseSectionDirectiveFVMLibInit0(StringRef, SMLoc) {
261     return parseSectionSwitch("__TEXT","__fvmlib_init0");
262   }
263 
264   bool parseSectionDirectiveFVMLibInit1(StringRef, SMLoc) {
265     return parseSectionSwitch("__TEXT","__fvmlib_init1");
266   }
267 
268   bool parseSectionDirectiveSymbolStub(StringRef, SMLoc) {
269     return parseSectionSwitch("__TEXT","__symbol_stub",
270                               MachO::S_SYMBOL_STUBS |
271                               MachO::S_ATTR_PURE_INSTRUCTIONS,
272                               // FIXME: Different on PPC and ARM.
273                               0, 16);
274   }
275 
276   bool parseSectionDirectivePICSymbolStub(StringRef, SMLoc) {
277     return parseSectionSwitch("__TEXT","__picsymbol_stub",
278                               MachO::S_SYMBOL_STUBS |
279                               MachO::S_ATTR_PURE_INSTRUCTIONS, 0, 26);
280   }
281 
282   bool parseSectionDirectiveData(StringRef, SMLoc) {
283     return parseSectionSwitch("__DATA", "__data");
284   }
285 
286   bool parseSectionDirectiveStaticData(StringRef, SMLoc) {
287     return parseSectionSwitch("__DATA", "__static_data");
288   }
289 
290   bool parseSectionDirectiveNonLazySymbolPointers(StringRef, SMLoc) {
291     return parseSectionSwitch("__DATA", "__nl_symbol_ptr",
292                               MachO::S_NON_LAZY_SYMBOL_POINTERS, 4);
293   }
294 
295   bool parseSectionDirectiveLazySymbolPointers(StringRef, SMLoc) {
296     return parseSectionSwitch("__DATA", "__la_symbol_ptr",
297                               MachO::S_LAZY_SYMBOL_POINTERS, 4);
298   }
299 
300   bool parseSectionDirectiveThreadLocalVariablePointers(StringRef, SMLoc) {
301     return parseSectionSwitch("__DATA", "__thread_ptr",
302                               MachO::S_THREAD_LOCAL_VARIABLE_POINTERS, 4);
303   }
304 
305   bool parseSectionDirectiveDyld(StringRef, SMLoc) {
306     return parseSectionSwitch("__DATA", "__dyld");
307   }
308 
309   bool parseSectionDirectiveModInitFunc(StringRef, SMLoc) {
310     return parseSectionSwitch("__DATA", "__mod_init_func",
311                               MachO::S_MOD_INIT_FUNC_POINTERS, 4);
312   }
313 
314   bool parseSectionDirectiveModTermFunc(StringRef, SMLoc) {
315     return parseSectionSwitch("__DATA", "__mod_term_func",
316                               MachO::S_MOD_TERM_FUNC_POINTERS, 4);
317   }
318 
319   bool parseSectionDirectiveConstData(StringRef, SMLoc) {
320     return parseSectionSwitch("__DATA", "__const");
321   }
322 
323   bool parseSectionDirectiveObjCClass(StringRef, SMLoc) {
324     return parseSectionSwitch("__OBJC", "__class",
325                               MachO::S_ATTR_NO_DEAD_STRIP);
326   }
327 
328   bool parseSectionDirectiveObjCMetaClass(StringRef, SMLoc) {
329     return parseSectionSwitch("__OBJC", "__meta_class",
330                               MachO::S_ATTR_NO_DEAD_STRIP);
331   }
332 
333   bool parseSectionDirectiveObjCCatClsMeth(StringRef, SMLoc) {
334     return parseSectionSwitch("__OBJC", "__cat_cls_meth",
335                               MachO::S_ATTR_NO_DEAD_STRIP);
336   }
337 
338   bool parseSectionDirectiveObjCCatInstMeth(StringRef, SMLoc) {
339     return parseSectionSwitch("__OBJC", "__cat_inst_meth",
340                               MachO::S_ATTR_NO_DEAD_STRIP);
341   }
342 
343   bool parseSectionDirectiveObjCProtocol(StringRef, SMLoc) {
344     return parseSectionSwitch("__OBJC", "__protocol",
345                               MachO::S_ATTR_NO_DEAD_STRIP);
346   }
347 
348   bool parseSectionDirectiveObjCStringObject(StringRef, SMLoc) {
349     return parseSectionSwitch("__OBJC", "__string_object",
350                               MachO::S_ATTR_NO_DEAD_STRIP);
351   }
352 
353   bool parseSectionDirectiveObjCClsMeth(StringRef, SMLoc) {
354     return parseSectionSwitch("__OBJC", "__cls_meth",
355                               MachO::S_ATTR_NO_DEAD_STRIP);
356   }
357 
358   bool parseSectionDirectiveObjCInstMeth(StringRef, SMLoc) {
359     return parseSectionSwitch("__OBJC", "__inst_meth",
360                               MachO::S_ATTR_NO_DEAD_STRIP);
361   }
362 
363   bool parseSectionDirectiveObjCClsRefs(StringRef, SMLoc) {
364     return parseSectionSwitch("__OBJC", "__cls_refs",
365                               MachO::S_ATTR_NO_DEAD_STRIP |
366                               MachO::S_LITERAL_POINTERS, 4);
367   }
368 
369   bool parseSectionDirectiveObjCMessageRefs(StringRef, SMLoc) {
370     return parseSectionSwitch("__OBJC", "__message_refs",
371                               MachO::S_ATTR_NO_DEAD_STRIP |
372                               MachO::S_LITERAL_POINTERS, 4);
373   }
374 
375   bool parseSectionDirectiveObjCSymbols(StringRef, SMLoc) {
376     return parseSectionSwitch("__OBJC", "__symbols",
377                               MachO::S_ATTR_NO_DEAD_STRIP);
378   }
379 
380   bool parseSectionDirectiveObjCCategory(StringRef, SMLoc) {
381     return parseSectionSwitch("__OBJC", "__category",
382                               MachO::S_ATTR_NO_DEAD_STRIP);
383   }
384 
385   bool parseSectionDirectiveObjCClassVars(StringRef, SMLoc) {
386     return parseSectionSwitch("__OBJC", "__class_vars",
387                               MachO::S_ATTR_NO_DEAD_STRIP);
388   }
389 
390   bool parseSectionDirectiveObjCInstanceVars(StringRef, SMLoc) {
391     return parseSectionSwitch("__OBJC", "__instance_vars",
392                               MachO::S_ATTR_NO_DEAD_STRIP);
393   }
394 
395   bool parseSectionDirectiveObjCModuleInfo(StringRef, SMLoc) {
396     return parseSectionSwitch("__OBJC", "__module_info",
397                               MachO::S_ATTR_NO_DEAD_STRIP);
398   }
399 
400   bool parseSectionDirectiveObjCClassNames(StringRef, SMLoc) {
401     return parseSectionSwitch("__TEXT", "__cstring",
402                               MachO::S_CSTRING_LITERALS);
403   }
404 
405   bool parseSectionDirectiveObjCMethVarTypes(StringRef, SMLoc) {
406     return parseSectionSwitch("__TEXT", "__cstring",
407                               MachO::S_CSTRING_LITERALS);
408   }
409 
410   bool parseSectionDirectiveObjCMethVarNames(StringRef, SMLoc) {
411     return parseSectionSwitch("__TEXT", "__cstring",
412                               MachO::S_CSTRING_LITERALS);
413   }
414 
415   bool parseSectionDirectiveObjCSelectorStrs(StringRef, SMLoc) {
416     return parseSectionSwitch("__OBJC", "__selector_strs",
417                               MachO::S_CSTRING_LITERALS);
418   }
419 
420   bool parseSectionDirectiveTData(StringRef, SMLoc) {
421     return parseSectionSwitch("__DATA", "__thread_data",
422                               MachO::S_THREAD_LOCAL_REGULAR);
423   }
424 
425   bool parseSectionDirectiveText(StringRef, SMLoc) {
426     return parseSectionSwitch("__TEXT", "__text",
427                               MachO::S_ATTR_PURE_INSTRUCTIONS);
428   }
429 
430   bool parseSectionDirectiveTLV(StringRef, SMLoc) {
431     return parseSectionSwitch("__DATA", "__thread_vars",
432                               MachO::S_THREAD_LOCAL_VARIABLES);
433   }
434 
435   bool parseSectionDirectiveIdent(StringRef, SMLoc) {
436     // Darwin silently ignores the .ident directive.
437     getParser().eatToEndOfStatement();
438     return false;
439   }
440 
441   bool parseSectionDirectiveThreadInitFunc(StringRef, SMLoc) {
442     return parseSectionSwitch("__DATA", "__thread_init",
443                          MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS);
444   }
445 
446   bool parseWatchOSVersionMin(StringRef Directive, SMLoc Loc) {
447     return parseVersionMin(Directive, Loc, MCVM_WatchOSVersionMin);
448   }
449   bool parseTvOSVersionMin(StringRef Directive, SMLoc Loc) {
450     return parseVersionMin(Directive, Loc, MCVM_TvOSVersionMin);
451   }
452   bool parseIOSVersionMin(StringRef Directive, SMLoc Loc) {
453     return parseVersionMin(Directive, Loc, MCVM_IOSVersionMin);
454   }
455   bool parseMacOSXVersionMin(StringRef Directive, SMLoc Loc) {
456     return parseVersionMin(Directive, Loc, MCVM_OSXVersionMin);
457   }
458 
459   bool parseBuildVersion(StringRef Directive, SMLoc Loc);
460   bool parseVersionMin(StringRef Directive, SMLoc Loc, MCVersionMinType Type);
461   bool parseMajorMinorVersionComponent(unsigned *Major, unsigned *Minor,
462                                        const char *VersionName);
463   bool parseOptionalTrailingVersionComponent(unsigned *Component,
464                                              const char *ComponentName);
465   bool parseVersion(unsigned *Major, unsigned *Minor, unsigned *Update);
466   bool parseSDKVersion(VersionTuple &SDKVersion);
467   void checkVersion(StringRef Directive, StringRef Arg, SMLoc Loc,
468                     Triple::OSType ExpectedOS);
469 };
470 
471 } // end anonymous namespace
472 
473 bool DarwinAsmParser::parseSectionSwitch(StringRef Segment, StringRef Section,
474                                          unsigned TAA, unsigned Align,
475                                          unsigned StubSize) {
476   if (getLexer().isNot(AsmToken::EndOfStatement))
477     return TokError("unexpected token in section switching directive");
478   Lex();
479 
480   // FIXME: Arch specific.
481   bool isText = TAA & MachO::S_ATTR_PURE_INSTRUCTIONS;
482   getStreamer().SwitchSection(getContext().getMachOSection(
483       Segment, Section, TAA, StubSize,
484       isText ? SectionKind::getText() : SectionKind::getData()));
485 
486   // Set the implicit alignment, if any.
487   //
488   // FIXME: This isn't really what 'as' does; I think it just uses the implicit
489   // alignment on the section (e.g., if one manually inserts bytes into the
490   // section, then just issuing the section switch directive will not realign
491   // the section. However, this is arguably more reasonable behavior, and there
492   // is no good reason for someone to intentionally emit incorrectly sized
493   // values into the implicitly aligned sections.
494   if (Align)
495     getStreamer().EmitValueToAlignment(Align);
496 
497   return false;
498 }
499 
500 /// parseDirectiveAltEntry
501 ///  ::= .alt_entry identifier
502 bool DarwinAsmParser::parseDirectiveAltEntry(StringRef, SMLoc) {
503   StringRef Name;
504   if (getParser().parseIdentifier(Name))
505     return TokError("expected identifier in directive");
506 
507   // Look up symbol.
508   MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
509 
510   if (Sym->isDefined())
511     return TokError(".alt_entry must preceed symbol definition");
512 
513   if (!getStreamer().EmitSymbolAttribute(Sym, MCSA_AltEntry))
514     return TokError("unable to emit symbol attribute");
515 
516   Lex();
517   return false;
518 }
519 
520 /// parseDirectiveDesc
521 ///  ::= .desc identifier , expression
522 bool DarwinAsmParser::parseDirectiveDesc(StringRef, SMLoc) {
523   StringRef Name;
524   if (getParser().parseIdentifier(Name))
525     return TokError("expected identifier in directive");
526 
527   // Handle the identifier as the key symbol.
528   MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
529 
530   if (getLexer().isNot(AsmToken::Comma))
531     return TokError("unexpected token in '.desc' directive");
532   Lex();
533 
534   int64_t DescValue;
535   if (getParser().parseAbsoluteExpression(DescValue))
536     return true;
537 
538   if (getLexer().isNot(AsmToken::EndOfStatement))
539     return TokError("unexpected token in '.desc' directive");
540 
541   Lex();
542 
543   // Set the n_desc field of this Symbol to this DescValue
544   getStreamer().EmitSymbolDesc(Sym, DescValue);
545 
546   return false;
547 }
548 
549 /// parseDirectiveIndirectSymbol
550 ///  ::= .indirect_symbol identifier
551 bool DarwinAsmParser::parseDirectiveIndirectSymbol(StringRef, SMLoc Loc) {
552   const MCSectionMachO *Current = static_cast<const MCSectionMachO *>(
553       getStreamer().getCurrentSectionOnly());
554   MachO::SectionType SectionType = Current->getType();
555   if (SectionType != MachO::S_NON_LAZY_SYMBOL_POINTERS &&
556       SectionType != MachO::S_LAZY_SYMBOL_POINTERS &&
557       SectionType != MachO::S_THREAD_LOCAL_VARIABLE_POINTERS &&
558       SectionType != MachO::S_SYMBOL_STUBS)
559     return Error(Loc, "indirect symbol not in a symbol pointer or stub "
560                       "section");
561 
562   StringRef Name;
563   if (getParser().parseIdentifier(Name))
564     return TokError("expected identifier in .indirect_symbol directive");
565 
566   MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
567 
568   // Assembler local symbols don't make any sense here. Complain loudly.
569   if (Sym->isTemporary())
570     return TokError("non-local symbol required in directive");
571 
572   if (!getStreamer().EmitSymbolAttribute(Sym, MCSA_IndirectSymbol))
573     return TokError("unable to emit indirect symbol attribute for: " + Name);
574 
575   if (getLexer().isNot(AsmToken::EndOfStatement))
576     return TokError("unexpected token in '.indirect_symbol' directive");
577 
578   Lex();
579 
580   return false;
581 }
582 
583 /// parseDirectiveDumpOrLoad
584 ///  ::= ( .dump | .load ) "filename"
585 bool DarwinAsmParser::parseDirectiveDumpOrLoad(StringRef Directive,
586                                                SMLoc IDLoc) {
587   bool IsDump = Directive == ".dump";
588   if (getLexer().isNot(AsmToken::String))
589     return TokError("expected string in '.dump' or '.load' directive");
590 
591   Lex();
592 
593   if (getLexer().isNot(AsmToken::EndOfStatement))
594     return TokError("unexpected token in '.dump' or '.load' directive");
595 
596   Lex();
597 
598   // FIXME: If/when .dump and .load are implemented they will be done in the
599   // the assembly parser and not have any need for an MCStreamer API.
600   if (IsDump)
601     return Warning(IDLoc, "ignoring directive .dump for now");
602   else
603     return Warning(IDLoc, "ignoring directive .load for now");
604 }
605 
606 /// ParseDirectiveLinkerOption
607 ///  ::= .linker_option "string" ( , "string" )*
608 bool DarwinAsmParser::parseDirectiveLinkerOption(StringRef IDVal, SMLoc) {
609   SmallVector<std::string, 4> Args;
610   while (true) {
611     if (getLexer().isNot(AsmToken::String))
612       return TokError("expected string in '" + Twine(IDVal) + "' directive");
613 
614     std::string Data;
615     if (getParser().parseEscapedString(Data))
616       return true;
617 
618     Args.push_back(Data);
619 
620     if (getLexer().is(AsmToken::EndOfStatement))
621       break;
622 
623     if (getLexer().isNot(AsmToken::Comma))
624       return TokError("unexpected token in '" + Twine(IDVal) + "' directive");
625     Lex();
626   }
627 
628   getStreamer().EmitLinkerOptions(Args);
629   return false;
630 }
631 
632 /// parseDirectiveLsym
633 ///  ::= .lsym identifier , expression
634 bool DarwinAsmParser::parseDirectiveLsym(StringRef, SMLoc) {
635   StringRef Name;
636   if (getParser().parseIdentifier(Name))
637     return TokError("expected identifier in directive");
638 
639   // Handle the identifier as the key symbol.
640   MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
641 
642   if (getLexer().isNot(AsmToken::Comma))
643     return TokError("unexpected token in '.lsym' directive");
644   Lex();
645 
646   const MCExpr *Value;
647   if (getParser().parseExpression(Value))
648     return true;
649 
650   if (getLexer().isNot(AsmToken::EndOfStatement))
651     return TokError("unexpected token in '.lsym' directive");
652 
653   Lex();
654 
655   // We don't currently support this directive.
656   //
657   // FIXME: Diagnostic location!
658   (void) Sym;
659   return TokError("directive '.lsym' is unsupported");
660 }
661 
662 /// parseDirectiveSection:
663 ///   ::= .section identifier (',' identifier)*
664 bool DarwinAsmParser::parseDirectiveSection(StringRef, SMLoc) {
665   SMLoc Loc = getLexer().getLoc();
666 
667   StringRef SectionName;
668   if (getParser().parseIdentifier(SectionName))
669     return Error(Loc, "expected identifier after '.section' directive");
670 
671   // Verify there is a following comma.
672   if (!getLexer().is(AsmToken::Comma))
673     return TokError("unexpected token in '.section' directive");
674 
675   std::string SectionSpec = SectionName;
676   SectionSpec += ",";
677 
678   // Add all the tokens until the end of the line, ParseSectionSpecifier will
679   // handle this.
680   StringRef EOL = getLexer().LexUntilEndOfStatement();
681   SectionSpec.append(EOL.begin(), EOL.end());
682 
683   Lex();
684   if (getLexer().isNot(AsmToken::EndOfStatement))
685     return TokError("unexpected token in '.section' directive");
686   Lex();
687 
688   StringRef Segment, Section;
689   unsigned StubSize;
690   unsigned TAA;
691   bool TAAParsed;
692   std::string ErrorStr =
693     MCSectionMachO::ParseSectionSpecifier(SectionSpec, Segment, Section,
694                                           TAA, TAAParsed, StubSize);
695 
696   if (!ErrorStr.empty())
697     return Error(Loc, ErrorStr);
698 
699   // Issue a warning if the target is not powerpc and Section is a *coal* section.
700   Triple TT = getParser().getContext().getObjectFileInfo()->getTargetTriple();
701   Triple::ArchType ArchTy = TT.getArch();
702 
703   if (ArchTy != Triple::ppc && ArchTy != Triple::ppc64) {
704     StringRef NonCoalSection = StringSwitch<StringRef>(Section)
705                                    .Case("__textcoal_nt", "__text")
706                                    .Case("__const_coal", "__const")
707                                    .Case("__datacoal_nt", "__data")
708                                    .Default(Section);
709 
710     if (!Section.equals(NonCoalSection)) {
711       StringRef SectionVal(Loc.getPointer());
712       size_t B = SectionVal.find(',') + 1, E = SectionVal.find(',', B);
713       SMLoc BLoc = SMLoc::getFromPointer(SectionVal.data() + B);
714       SMLoc ELoc = SMLoc::getFromPointer(SectionVal.data() + E);
715       getParser().Warning(Loc, "section \"" + Section + "\" is deprecated",
716                           SMRange(BLoc, ELoc));
717       getParser().Note(Loc, "change section name to \"" + NonCoalSection +
718                        "\"", SMRange(BLoc, ELoc));
719     }
720   }
721 
722   // FIXME: Arch specific.
723   bool isText = Segment == "__TEXT";  // FIXME: Hack.
724   getStreamer().SwitchSection(getContext().getMachOSection(
725       Segment, Section, TAA, StubSize,
726       isText ? SectionKind::getText() : SectionKind::getData()));
727   return false;
728 }
729 
730 /// ParseDirectivePushSection:
731 ///   ::= .pushsection identifier (',' identifier)*
732 bool DarwinAsmParser::parseDirectivePushSection(StringRef S, SMLoc Loc) {
733   getStreamer().PushSection();
734 
735   if (parseDirectiveSection(S, Loc)) {
736     getStreamer().PopSection();
737     return true;
738   }
739 
740   return false;
741 }
742 
743 /// ParseDirectivePopSection:
744 ///   ::= .popsection
745 bool DarwinAsmParser::parseDirectivePopSection(StringRef, SMLoc) {
746   if (!getStreamer().PopSection())
747     return TokError(".popsection without corresponding .pushsection");
748   return false;
749 }
750 
751 /// ParseDirectivePrevious:
752 ///   ::= .previous
753 bool DarwinAsmParser::parseDirectivePrevious(StringRef DirName, SMLoc) {
754   MCSectionSubPair PreviousSection = getStreamer().getPreviousSection();
755   if (!PreviousSection.first)
756     return TokError(".previous without corresponding .section");
757   getStreamer().SwitchSection(PreviousSection.first, PreviousSection.second);
758   return false;
759 }
760 
761 /// ParseDirectiveSecureLogUnique
762 ///  ::= .secure_log_unique ... message ...
763 bool DarwinAsmParser::parseDirectiveSecureLogUnique(StringRef, SMLoc IDLoc) {
764   StringRef LogMessage = getParser().parseStringToEndOfStatement();
765   if (getLexer().isNot(AsmToken::EndOfStatement))
766     return TokError("unexpected token in '.secure_log_unique' directive");
767 
768   if (getContext().getSecureLogUsed())
769     return Error(IDLoc, ".secure_log_unique specified multiple times");
770 
771   // Get the secure log path.
772   const char *SecureLogFile = getContext().getSecureLogFile();
773   if (!SecureLogFile)
774     return Error(IDLoc, ".secure_log_unique used but AS_SECURE_LOG_FILE "
775                  "environment variable unset.");
776 
777   // Open the secure log file if we haven't already.
778   raw_fd_ostream *OS = getContext().getSecureLog();
779   if (!OS) {
780     std::error_code EC;
781     auto NewOS = std::make_unique<raw_fd_ostream>(
782         StringRef(SecureLogFile), EC, sys::fs::OF_Append | sys::fs::OF_Text);
783     if (EC)
784        return Error(IDLoc, Twine("can't open secure log file: ") +
785                                SecureLogFile + " (" + EC.message() + ")");
786     OS = NewOS.get();
787     getContext().setSecureLog(std::move(NewOS));
788   }
789 
790   // Write the message.
791   unsigned CurBuf = getSourceManager().FindBufferContainingLoc(IDLoc);
792   *OS << getSourceManager().getBufferInfo(CurBuf).Buffer->getBufferIdentifier()
793       << ":" << getSourceManager().FindLineNumber(IDLoc, CurBuf) << ":"
794       << LogMessage + "\n";
795 
796   getContext().setSecureLogUsed(true);
797 
798   return false;
799 }
800 
801 /// ParseDirectiveSecureLogReset
802 ///  ::= .secure_log_reset
803 bool DarwinAsmParser::parseDirectiveSecureLogReset(StringRef, SMLoc IDLoc) {
804   if (getLexer().isNot(AsmToken::EndOfStatement))
805     return TokError("unexpected token in '.secure_log_reset' directive");
806 
807   Lex();
808 
809   getContext().setSecureLogUsed(false);
810 
811   return false;
812 }
813 
814 /// parseDirectiveSubsectionsViaSymbols
815 ///  ::= .subsections_via_symbols
816 bool DarwinAsmParser::parseDirectiveSubsectionsViaSymbols(StringRef, SMLoc) {
817   if (getLexer().isNot(AsmToken::EndOfStatement))
818     return TokError("unexpected token in '.subsections_via_symbols' directive");
819 
820   Lex();
821 
822   getStreamer().EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
823 
824   return false;
825 }
826 
827 /// ParseDirectiveTBSS
828 ///  ::= .tbss identifier, size, align
829 bool DarwinAsmParser::parseDirectiveTBSS(StringRef, SMLoc) {
830   SMLoc IDLoc = getLexer().getLoc();
831   StringRef Name;
832   if (getParser().parseIdentifier(Name))
833     return TokError("expected identifier in directive");
834 
835   // Handle the identifier as the key symbol.
836   MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
837 
838   if (getLexer().isNot(AsmToken::Comma))
839     return TokError("unexpected token in directive");
840   Lex();
841 
842   int64_t Size;
843   SMLoc SizeLoc = getLexer().getLoc();
844   if (getParser().parseAbsoluteExpression(Size))
845     return true;
846 
847   int64_t Pow2Alignment = 0;
848   SMLoc Pow2AlignmentLoc;
849   if (getLexer().is(AsmToken::Comma)) {
850     Lex();
851     Pow2AlignmentLoc = getLexer().getLoc();
852     if (getParser().parseAbsoluteExpression(Pow2Alignment))
853       return true;
854   }
855 
856   if (getLexer().isNot(AsmToken::EndOfStatement))
857     return TokError("unexpected token in '.tbss' directive");
858 
859   Lex();
860 
861   if (Size < 0)
862     return Error(SizeLoc, "invalid '.tbss' directive size, can't be less than"
863                  "zero");
864 
865   // FIXME: Diagnose overflow.
866   if (Pow2Alignment < 0)
867     return Error(Pow2AlignmentLoc, "invalid '.tbss' alignment, can't be less"
868                  "than zero");
869 
870   if (!Sym->isUndefined())
871     return Error(IDLoc, "invalid symbol redefinition");
872 
873   getStreamer().EmitTBSSSymbol(getContext().getMachOSection(
874                                  "__DATA", "__thread_bss",
875                                  MachO::S_THREAD_LOCAL_ZEROFILL,
876                                  0, SectionKind::getThreadBSS()),
877                                Sym, Size, 1 << Pow2Alignment);
878 
879   return false;
880 }
881 
882 /// ParseDirectiveZerofill
883 ///  ::= .zerofill segname , sectname [, identifier , size_expression [
884 ///      , align_expression ]]
885 bool DarwinAsmParser::parseDirectiveZerofill(StringRef, SMLoc) {
886   StringRef Segment;
887   if (getParser().parseIdentifier(Segment))
888     return TokError("expected segment name after '.zerofill' directive");
889 
890   if (getLexer().isNot(AsmToken::Comma))
891     return TokError("unexpected token in directive");
892   Lex();
893 
894   StringRef Section;
895   SMLoc SectionLoc = getLexer().getLoc();
896   if (getParser().parseIdentifier(Section))
897     return TokError("expected section name after comma in '.zerofill' "
898                     "directive");
899 
900   // If this is the end of the line all that was wanted was to create the
901   // the section but with no symbol.
902   if (getLexer().is(AsmToken::EndOfStatement)) {
903     // Create the zerofill section but no symbol
904     getStreamer().EmitZerofill(
905         getContext().getMachOSection(Segment, Section, MachO::S_ZEROFILL, 0,
906                                      SectionKind::getBSS()),
907         /*Symbol=*/nullptr, /*Size=*/0, /*ByteAlignment=*/0, SectionLoc);
908     return false;
909   }
910 
911   if (getLexer().isNot(AsmToken::Comma))
912     return TokError("unexpected token in directive");
913   Lex();
914 
915   SMLoc IDLoc = getLexer().getLoc();
916   StringRef IDStr;
917   if (getParser().parseIdentifier(IDStr))
918     return TokError("expected identifier in directive");
919 
920   // handle the identifier as the key symbol.
921   MCSymbol *Sym = getContext().getOrCreateSymbol(IDStr);
922 
923   if (getLexer().isNot(AsmToken::Comma))
924     return TokError("unexpected token in directive");
925   Lex();
926 
927   int64_t Size;
928   SMLoc SizeLoc = getLexer().getLoc();
929   if (getParser().parseAbsoluteExpression(Size))
930     return true;
931 
932   int64_t Pow2Alignment = 0;
933   SMLoc Pow2AlignmentLoc;
934   if (getLexer().is(AsmToken::Comma)) {
935     Lex();
936     Pow2AlignmentLoc = getLexer().getLoc();
937     if (getParser().parseAbsoluteExpression(Pow2Alignment))
938       return true;
939   }
940 
941   if (getLexer().isNot(AsmToken::EndOfStatement))
942     return TokError("unexpected token in '.zerofill' directive");
943 
944   Lex();
945 
946   if (Size < 0)
947     return Error(SizeLoc, "invalid '.zerofill' directive size, can't be less "
948                  "than zero");
949 
950   // NOTE: The alignment in the directive is a power of 2 value, the assembler
951   // may internally end up wanting an alignment in bytes.
952   // FIXME: Diagnose overflow.
953   if (Pow2Alignment < 0)
954     return Error(Pow2AlignmentLoc, "invalid '.zerofill' directive alignment, "
955                  "can't be less than zero");
956 
957   if (!Sym->isUndefined())
958     return Error(IDLoc, "invalid symbol redefinition");
959 
960   // Create the zerofill Symbol with Size and Pow2Alignment
961   //
962   // FIXME: Arch specific.
963   getStreamer().EmitZerofill(getContext().getMachOSection(
964                                Segment, Section, MachO::S_ZEROFILL,
965                                0, SectionKind::getBSS()),
966                              Sym, Size, 1 << Pow2Alignment, SectionLoc);
967 
968   return false;
969 }
970 
971 /// ParseDirectiveDataRegion
972 ///  ::= .data_region [ ( jt8 | jt16 | jt32 ) ]
973 bool DarwinAsmParser::parseDirectiveDataRegion(StringRef, SMLoc) {
974   if (getLexer().is(AsmToken::EndOfStatement)) {
975     Lex();
976     getStreamer().EmitDataRegion(MCDR_DataRegion);
977     return false;
978   }
979   StringRef RegionType;
980   SMLoc Loc = getParser().getTok().getLoc();
981   if (getParser().parseIdentifier(RegionType))
982     return TokError("expected region type after '.data_region' directive");
983   int Kind = StringSwitch<int>(RegionType)
984     .Case("jt8", MCDR_DataRegionJT8)
985     .Case("jt16", MCDR_DataRegionJT16)
986     .Case("jt32", MCDR_DataRegionJT32)
987     .Default(-1);
988   if (Kind == -1)
989     return Error(Loc, "unknown region type in '.data_region' directive");
990   Lex();
991 
992   getStreamer().EmitDataRegion((MCDataRegionType)Kind);
993   return false;
994 }
995 
996 /// ParseDirectiveDataRegionEnd
997 ///  ::= .end_data_region
998 bool DarwinAsmParser::parseDirectiveDataRegionEnd(StringRef, SMLoc) {
999   if (getLexer().isNot(AsmToken::EndOfStatement))
1000     return TokError("unexpected token in '.end_data_region' directive");
1001 
1002   Lex();
1003   getStreamer().EmitDataRegion(MCDR_DataRegionEnd);
1004   return false;
1005 }
1006 
1007 static bool isSDKVersionToken(const AsmToken &Tok) {
1008   return Tok.is(AsmToken::Identifier) && Tok.getIdentifier() == "sdk_version";
1009 }
1010 
1011 /// parseMajorMinorVersionComponent ::= major, minor
1012 bool DarwinAsmParser::parseMajorMinorVersionComponent(unsigned *Major,
1013                                                       unsigned *Minor,
1014                                                       const char *VersionName) {
1015   // Get the major version number.
1016   if (getLexer().isNot(AsmToken::Integer))
1017     return TokError(Twine("invalid ") + VersionName +
1018                     " major version number, integer expected");
1019   int64_t MajorVal = getLexer().getTok().getIntVal();
1020   if (MajorVal > 65535 || MajorVal <= 0)
1021     return TokError(Twine("invalid ") + VersionName + " major version number");
1022   *Major = (unsigned)MajorVal;
1023   Lex();
1024   if (getLexer().isNot(AsmToken::Comma))
1025     return TokError(Twine(VersionName) +
1026                     " minor version number required, comma expected");
1027   Lex();
1028   // Get the minor version number.
1029   if (getLexer().isNot(AsmToken::Integer))
1030     return TokError(Twine("invalid ") + VersionName +
1031                     " minor version number, integer expected");
1032   int64_t MinorVal = getLexer().getTok().getIntVal();
1033   if (MinorVal > 255 || MinorVal < 0)
1034     return TokError(Twine("invalid ") + VersionName + " minor version number");
1035   *Minor = MinorVal;
1036   Lex();
1037   return false;
1038 }
1039 
1040 /// parseOptionalTrailingVersionComponent ::= , version_number
1041 bool DarwinAsmParser::parseOptionalTrailingVersionComponent(
1042     unsigned *Component, const char *ComponentName) {
1043   assert(getLexer().is(AsmToken::Comma) && "comma expected");
1044   Lex();
1045   if (getLexer().isNot(AsmToken::Integer))
1046     return TokError(Twine("invalid ") + ComponentName +
1047                     " version number, integer expected");
1048   int64_t Val = getLexer().getTok().getIntVal();
1049   if (Val > 255 || Val < 0)
1050     return TokError(Twine("invalid ") + ComponentName + " version number");
1051   *Component = Val;
1052   Lex();
1053   return false;
1054 }
1055 
1056 /// parseVersion ::= parseMajorMinorVersionComponent
1057 ///                      parseOptionalTrailingVersionComponent
1058 bool DarwinAsmParser::parseVersion(unsigned *Major, unsigned *Minor,
1059                                    unsigned *Update) {
1060   if (parseMajorMinorVersionComponent(Major, Minor, "OS"))
1061     return true;
1062 
1063   // Get the update level, if specified
1064   *Update = 0;
1065   if (getLexer().is(AsmToken::EndOfStatement) ||
1066       isSDKVersionToken(getLexer().getTok()))
1067     return false;
1068   if (getLexer().isNot(AsmToken::Comma))
1069     return TokError("invalid OS update specifier, comma expected");
1070   if (parseOptionalTrailingVersionComponent(Update, "OS update"))
1071     return true;
1072   return false;
1073 }
1074 
1075 bool DarwinAsmParser::parseSDKVersion(VersionTuple &SDKVersion) {
1076   assert(isSDKVersionToken(getLexer().getTok()) && "expected sdk_version");
1077   Lex();
1078   unsigned Major, Minor;
1079   if (parseMajorMinorVersionComponent(&Major, &Minor, "SDK"))
1080     return true;
1081   SDKVersion = VersionTuple(Major, Minor);
1082 
1083   // Get the subminor version, if specified.
1084   if (getLexer().is(AsmToken::Comma)) {
1085     unsigned Subminor;
1086     if (parseOptionalTrailingVersionComponent(&Subminor, "SDK subminor"))
1087       return true;
1088     SDKVersion = VersionTuple(Major, Minor, Subminor);
1089   }
1090   return false;
1091 }
1092 
1093 void DarwinAsmParser::checkVersion(StringRef Directive, StringRef Arg,
1094                                    SMLoc Loc, Triple::OSType ExpectedOS) {
1095   const Triple &Target = getContext().getObjectFileInfo()->getTargetTriple();
1096   if (Target.getOS() != ExpectedOS)
1097     Warning(Loc, Twine(Directive) +
1098             (Arg.empty() ? Twine() : Twine(' ') + Arg) +
1099             " used while targeting " + Target.getOSName());
1100 
1101   if (LastVersionDirective.isValid()) {
1102     Warning(Loc, "overriding previous version directive");
1103     Note(LastVersionDirective, "previous definition is here");
1104   }
1105   LastVersionDirective = Loc;
1106 }
1107 
1108 static Triple::OSType getOSTypeFromMCVM(MCVersionMinType Type) {
1109   switch (Type) {
1110   case MCVM_WatchOSVersionMin: return Triple::WatchOS;
1111   case MCVM_TvOSVersionMin:    return Triple::TvOS;
1112   case MCVM_IOSVersionMin:     return Triple::IOS;
1113   case MCVM_OSXVersionMin:     return Triple::MacOSX;
1114   }
1115   llvm_unreachable("Invalid mc version min type");
1116 }
1117 
1118 /// parseVersionMin
1119 ///   ::= .ios_version_min parseVersion parseSDKVersion
1120 ///   |   .macosx_version_min parseVersion parseSDKVersion
1121 ///   |   .tvos_version_min parseVersion parseSDKVersion
1122 ///   |   .watchos_version_min parseVersion parseSDKVersion
1123 bool DarwinAsmParser::parseVersionMin(StringRef Directive, SMLoc Loc,
1124                                       MCVersionMinType Type) {
1125   unsigned Major;
1126   unsigned Minor;
1127   unsigned Update;
1128   if (parseVersion(&Major, &Minor, &Update))
1129     return true;
1130 
1131   VersionTuple SDKVersion;
1132   if (isSDKVersionToken(getLexer().getTok()) && parseSDKVersion(SDKVersion))
1133     return true;
1134 
1135   if (parseToken(AsmToken::EndOfStatement))
1136     return addErrorSuffix(Twine(" in '") + Directive + "' directive");
1137 
1138   Triple::OSType ExpectedOS = getOSTypeFromMCVM(Type);
1139   checkVersion(Directive, StringRef(), Loc, ExpectedOS);
1140   getStreamer().EmitVersionMin(Type, Major, Minor, Update, SDKVersion);
1141   return false;
1142 }
1143 
1144 static Triple::OSType getOSTypeFromPlatform(MachO::PlatformType Type) {
1145   switch (Type) {
1146   case MachO::PLATFORM_MACOS:   return Triple::MacOSX;
1147   case MachO::PLATFORM_IOS:     return Triple::IOS;
1148   case MachO::PLATFORM_TVOS:    return Triple::TvOS;
1149   case MachO::PLATFORM_WATCHOS: return Triple::WatchOS;
1150   case MachO::PLATFORM_BRIDGEOS:         /* silence warning */ break;
1151   case MachO::PLATFORM_MACCATALYST: return Triple::IOS;
1152   case MachO::PLATFORM_IOSSIMULATOR:     /* silence warning */ break;
1153   case MachO::PLATFORM_TVOSSIMULATOR:    /* silence warning */ break;
1154   case MachO::PLATFORM_WATCHOSSIMULATOR: /* silence warning */ break;
1155   }
1156   llvm_unreachable("Invalid mach-o platform type");
1157 }
1158 
1159 /// parseBuildVersion
1160 ///   ::= .build_version (macos|ios|tvos|watchos), parseVersion parseSDKVersion
1161 bool DarwinAsmParser::parseBuildVersion(StringRef Directive, SMLoc Loc) {
1162   StringRef PlatformName;
1163   SMLoc PlatformLoc = getTok().getLoc();
1164   if (getParser().parseIdentifier(PlatformName))
1165     return TokError("platform name expected");
1166 
1167   unsigned Platform = StringSwitch<unsigned>(PlatformName)
1168     .Case("macos", MachO::PLATFORM_MACOS)
1169     .Case("ios", MachO::PLATFORM_IOS)
1170     .Case("tvos", MachO::PLATFORM_TVOS)
1171     .Case("watchos", MachO::PLATFORM_WATCHOS)
1172     .Case("macCatalyst", MachO::PLATFORM_MACCATALYST)
1173     .Default(0);
1174   if (Platform == 0)
1175     return Error(PlatformLoc, "unknown platform name");
1176 
1177   if (getLexer().isNot(AsmToken::Comma))
1178     return TokError("version number required, comma expected");
1179   Lex();
1180 
1181   unsigned Major;
1182   unsigned Minor;
1183   unsigned Update;
1184   if (parseVersion(&Major, &Minor, &Update))
1185     return true;
1186 
1187   VersionTuple SDKVersion;
1188   if (isSDKVersionToken(getLexer().getTok()) && parseSDKVersion(SDKVersion))
1189     return true;
1190 
1191   if (parseToken(AsmToken::EndOfStatement))
1192     return addErrorSuffix(" in '.build_version' directive");
1193 
1194   Triple::OSType ExpectedOS
1195     = getOSTypeFromPlatform((MachO::PlatformType)Platform);
1196   checkVersion(Directive, PlatformName, Loc, ExpectedOS);
1197   getStreamer().EmitBuildVersion(Platform, Major, Minor, Update, SDKVersion);
1198   return false;
1199 }
1200 
1201 
1202 namespace llvm {
1203 
1204 MCAsmParserExtension *createDarwinAsmParser() {
1205   return new DarwinAsmParser;
1206 }
1207 
1208 } // end llvm namespace
1209