xref: /freebsd/contrib/llvm-project/llvm/lib/MC/MCParser/DarwinAsmParser.cpp (revision 924226fba12cc9a228c73b956e1b7fa24c60b055) 
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/Error.h"
27 #include "llvm/Support/FileSystem.h"
28 #include "llvm/Support/MemoryBuffer.h"
29 #include "llvm/Support/SMLoc.h"
30 #include "llvm/Support/SourceMgr.h"
31 #include "llvm/Support/raw_ostream.h"
32 #include <algorithm>
33 #include <cstddef>
34 #include <cstdint>
35 #include <string>
36 #include <system_error>
37 #include <utility>
38 
39 using namespace llvm;
40 
41 namespace {
42 
43 /// Implementation of directive handling which is shared across all
44 /// Darwin targets.
45 class DarwinAsmParser : public MCAsmParserExtension {
46   template<bool (DarwinAsmParser::*HandlerMethod)(StringRef, SMLoc)>
47   void addDirectiveHandler(StringRef Directive) {
48     MCAsmParser::ExtensionDirectiveHandler Handler = std::make_pair(
49         this, HandleDirective<DarwinAsmParser, HandlerMethod>);
50     getParser().addDirectiveHandler(Directive, Handler);
51   }
52 
53   bool parseSectionSwitch(StringRef Segment, StringRef Section,
54                           unsigned TAA = 0, unsigned ImplicitAlign = 0,
55                           unsigned StubSize = 0);
56 
57   SMLoc LastVersionDirective;
58 
59 public:
60   DarwinAsmParser() = default;
61 
62   void Initialize(MCAsmParser &Parser) override {
63     // Call the base implementation.
64     this->MCAsmParserExtension::Initialize(Parser);
65 
66     addDirectiveHandler<&DarwinAsmParser::parseDirectiveAltEntry>(".alt_entry");
67     addDirectiveHandler<&DarwinAsmParser::parseDirectiveDesc>(".desc");
68     addDirectiveHandler<&DarwinAsmParser::parseDirectiveIndirectSymbol>(
69       ".indirect_symbol");
70     addDirectiveHandler<&DarwinAsmParser::parseDirectiveLsym>(".lsym");
71     addDirectiveHandler<&DarwinAsmParser::parseDirectiveSubsectionsViaSymbols>(
72       ".subsections_via_symbols");
73     addDirectiveHandler<&DarwinAsmParser::parseDirectiveDumpOrLoad>(".dump");
74     addDirectiveHandler<&DarwinAsmParser::parseDirectiveDumpOrLoad>(".load");
75     addDirectiveHandler<&DarwinAsmParser::parseDirectiveSection>(".section");
76     addDirectiveHandler<&DarwinAsmParser::parseDirectivePushSection>(
77       ".pushsection");
78     addDirectiveHandler<&DarwinAsmParser::parseDirectivePopSection>(
79       ".popsection");
80     addDirectiveHandler<&DarwinAsmParser::parseDirectivePrevious>(".previous");
81     addDirectiveHandler<&DarwinAsmParser::parseDirectiveSecureLogUnique>(
82       ".secure_log_unique");
83     addDirectiveHandler<&DarwinAsmParser::parseDirectiveSecureLogReset>(
84       ".secure_log_reset");
85     addDirectiveHandler<&DarwinAsmParser::parseDirectiveTBSS>(".tbss");
86     addDirectiveHandler<&DarwinAsmParser::parseDirectiveZerofill>(".zerofill");
87 
88     addDirectiveHandler<&DarwinAsmParser::parseDirectiveDataRegion>(
89       ".data_region");
90     addDirectiveHandler<&DarwinAsmParser::parseDirectiveDataRegionEnd>(
91       ".end_data_region");
92 
93     // Special section directives.
94     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveBss>(".bss");
95     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveConst>(".const");
96     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveConstData>(
97       ".const_data");
98     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveConstructor>(
99       ".constructor");
100     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveCString>(
101       ".cstring");
102     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveData>(".data");
103     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveDestructor>(
104       ".destructor");
105     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveDyld>(".dyld");
106     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveFVMLibInit0>(
107       ".fvmlib_init0");
108     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveFVMLibInit1>(
109       ".fvmlib_init1");
110     addDirectiveHandler<
111       &DarwinAsmParser::parseSectionDirectiveLazySymbolPointers>(
112         ".lazy_symbol_pointer");
113     addDirectiveHandler<&DarwinAsmParser::parseDirectiveLinkerOption>(
114       ".linker_option");
115     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveLiteral16>(
116       ".literal16");
117     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveLiteral4>(
118       ".literal4");
119     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveLiteral8>(
120       ".literal8");
121     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveModInitFunc>(
122       ".mod_init_func");
123     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveModTermFunc>(
124       ".mod_term_func");
125     addDirectiveHandler<
126       &DarwinAsmParser::parseSectionDirectiveNonLazySymbolPointers>(
127         ".non_lazy_symbol_pointer");
128     addDirectiveHandler<
129       &DarwinAsmParser::parseSectionDirectiveThreadLocalVariablePointers>(
130         ".thread_local_variable_pointer");
131     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCCatClsMeth>(
132       ".objc_cat_cls_meth");
133     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCCatInstMeth>(
134       ".objc_cat_inst_meth");
135     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCCategory>(
136       ".objc_category");
137     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCClass>(
138       ".objc_class");
139     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCClassNames>(
140       ".objc_class_names");
141     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCClassVars>(
142       ".objc_class_vars");
143     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCClsMeth>(
144       ".objc_cls_meth");
145     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCClsRefs>(
146       ".objc_cls_refs");
147     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCInstMeth>(
148       ".objc_inst_meth");
149     addDirectiveHandler<
150       &DarwinAsmParser::parseSectionDirectiveObjCInstanceVars>(
151         ".objc_instance_vars");
152     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCMessageRefs>(
153       ".objc_message_refs");
154     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCMetaClass>(
155       ".objc_meta_class");
156     addDirectiveHandler<
157       &DarwinAsmParser::parseSectionDirectiveObjCMethVarNames>(
158         ".objc_meth_var_names");
159     addDirectiveHandler<
160       &DarwinAsmParser::parseSectionDirectiveObjCMethVarTypes>(
161         ".objc_meth_var_types");
162     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCModuleInfo>(
163       ".objc_module_info");
164     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCProtocol>(
165       ".objc_protocol");
166     addDirectiveHandler<
167       &DarwinAsmParser::parseSectionDirectiveObjCSelectorStrs>(
168         ".objc_selector_strs");
169     addDirectiveHandler<
170       &DarwinAsmParser::parseSectionDirectiveObjCStringObject>(
171         ".objc_string_object");
172     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveObjCSymbols>(
173       ".objc_symbols");
174     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectivePICSymbolStub>(
175       ".picsymbol_stub");
176     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveStaticConst>(
177       ".static_const");
178     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveStaticData>(
179       ".static_data");
180     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveSymbolStub>(
181       ".symbol_stub");
182     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveTData>(".tdata");
183     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveText>(".text");
184     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveThreadInitFunc>(
185       ".thread_init_func");
186     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveTLV>(".tlv");
187 
188     addDirectiveHandler<&DarwinAsmParser::parseSectionDirectiveIdent>(".ident");
189     addDirectiveHandler<&DarwinAsmParser::parseWatchOSVersionMin>(
190       ".watchos_version_min");
191     addDirectiveHandler<&DarwinAsmParser::parseTvOSVersionMin>(
192       ".tvos_version_min");
193     addDirectiveHandler<&DarwinAsmParser::parseIOSVersionMin>(
194       ".ios_version_min");
195     addDirectiveHandler<&DarwinAsmParser::parseMacOSXVersionMin>(
196       ".macosx_version_min");
197     addDirectiveHandler<&DarwinAsmParser::parseBuildVersion>(".build_version");
198     addDirectiveHandler<&DarwinAsmParser::parseDirectiveCGProfile>(
199         ".cg_profile");
200 
201     LastVersionDirective = SMLoc();
202   }
203 
204   bool parseDirectiveAltEntry(StringRef, SMLoc);
205   bool parseDirectiveDesc(StringRef, SMLoc);
206   bool parseDirectiveIndirectSymbol(StringRef, SMLoc);
207   bool parseDirectiveDumpOrLoad(StringRef, SMLoc);
208   bool parseDirectiveLsym(StringRef, SMLoc);
209   bool parseDirectiveLinkerOption(StringRef, SMLoc);
210   bool parseDirectiveSection(StringRef, SMLoc);
211   bool parseDirectivePushSection(StringRef, SMLoc);
212   bool parseDirectivePopSection(StringRef, SMLoc);
213   bool parseDirectivePrevious(StringRef, SMLoc);
214   bool parseDirectiveSecureLogReset(StringRef, SMLoc);
215   bool parseDirectiveSecureLogUnique(StringRef, SMLoc);
216   bool parseDirectiveSubsectionsViaSymbols(StringRef, SMLoc);
217   bool parseDirectiveTBSS(StringRef, SMLoc);
218   bool parseDirectiveZerofill(StringRef, SMLoc);
219   bool parseDirectiveDataRegion(StringRef, SMLoc);
220   bool parseDirectiveDataRegionEnd(StringRef, SMLoc);
221 
222   // Named Section Directive
223   bool parseSectionDirectiveBss(StringRef, SMLoc) {
224     return parseSectionSwitch("__DATA", "__bss");
225   }
226 
227   bool parseSectionDirectiveConst(StringRef, SMLoc) {
228     return parseSectionSwitch("__TEXT", "__const");
229   }
230 
231   bool parseSectionDirectiveStaticConst(StringRef, SMLoc) {
232     return parseSectionSwitch("__TEXT", "__static_const");
233   }
234 
235   bool parseSectionDirectiveCString(StringRef, SMLoc) {
236     return parseSectionSwitch("__TEXT","__cstring",
237                               MachO::S_CSTRING_LITERALS);
238   }
239 
240   bool parseSectionDirectiveLiteral4(StringRef, SMLoc) {
241     return parseSectionSwitch("__TEXT", "__literal4",
242                               MachO::S_4BYTE_LITERALS, 4);
243   }
244 
245   bool parseSectionDirectiveLiteral8(StringRef, SMLoc) {
246     return parseSectionSwitch("__TEXT", "__literal8",
247                               MachO::S_8BYTE_LITERALS, 8);
248   }
249 
250   bool parseSectionDirectiveLiteral16(StringRef, SMLoc) {
251     return parseSectionSwitch("__TEXT","__literal16",
252                               MachO::S_16BYTE_LITERALS, 16);
253   }
254 
255   bool parseSectionDirectiveConstructor(StringRef, SMLoc) {
256     return parseSectionSwitch("__TEXT","__constructor");
257   }
258 
259   bool parseSectionDirectiveDestructor(StringRef, SMLoc) {
260     return parseSectionSwitch("__TEXT","__destructor");
261   }
262 
263   bool parseSectionDirectiveFVMLibInit0(StringRef, SMLoc) {
264     return parseSectionSwitch("__TEXT","__fvmlib_init0");
265   }
266 
267   bool parseSectionDirectiveFVMLibInit1(StringRef, SMLoc) {
268     return parseSectionSwitch("__TEXT","__fvmlib_init1");
269   }
270 
271   bool parseSectionDirectiveSymbolStub(StringRef, SMLoc) {
272     return parseSectionSwitch("__TEXT","__symbol_stub",
273                               MachO::S_SYMBOL_STUBS |
274                               MachO::S_ATTR_PURE_INSTRUCTIONS,
275                               // FIXME: Different on PPC and ARM.
276                               0, 16);
277   }
278 
279   bool parseSectionDirectivePICSymbolStub(StringRef, SMLoc) {
280     return parseSectionSwitch("__TEXT","__picsymbol_stub",
281                               MachO::S_SYMBOL_STUBS |
282                               MachO::S_ATTR_PURE_INSTRUCTIONS, 0, 26);
283   }
284 
285   bool parseSectionDirectiveData(StringRef, SMLoc) {
286     return parseSectionSwitch("__DATA", "__data");
287   }
288 
289   bool parseSectionDirectiveStaticData(StringRef, SMLoc) {
290     return parseSectionSwitch("__DATA", "__static_data");
291   }
292 
293   bool parseSectionDirectiveNonLazySymbolPointers(StringRef, SMLoc) {
294     return parseSectionSwitch("__DATA", "__nl_symbol_ptr",
295                               MachO::S_NON_LAZY_SYMBOL_POINTERS, 4);
296   }
297 
298   bool parseSectionDirectiveLazySymbolPointers(StringRef, SMLoc) {
299     return parseSectionSwitch("__DATA", "__la_symbol_ptr",
300                               MachO::S_LAZY_SYMBOL_POINTERS, 4);
301   }
302 
303   bool parseSectionDirectiveThreadLocalVariablePointers(StringRef, SMLoc) {
304     return parseSectionSwitch("__DATA", "__thread_ptr",
305                               MachO::S_THREAD_LOCAL_VARIABLE_POINTERS, 4);
306   }
307 
308   bool parseSectionDirectiveDyld(StringRef, SMLoc) {
309     return parseSectionSwitch("__DATA", "__dyld");
310   }
311 
312   bool parseSectionDirectiveModInitFunc(StringRef, SMLoc) {
313     return parseSectionSwitch("__DATA", "__mod_init_func",
314                               MachO::S_MOD_INIT_FUNC_POINTERS, 4);
315   }
316 
317   bool parseSectionDirectiveModTermFunc(StringRef, SMLoc) {
318     return parseSectionSwitch("__DATA", "__mod_term_func",
319                               MachO::S_MOD_TERM_FUNC_POINTERS, 4);
320   }
321 
322   bool parseSectionDirectiveConstData(StringRef, SMLoc) {
323     return parseSectionSwitch("__DATA", "__const");
324   }
325 
326   bool parseSectionDirectiveObjCClass(StringRef, SMLoc) {
327     return parseSectionSwitch("__OBJC", "__class",
328                               MachO::S_ATTR_NO_DEAD_STRIP);
329   }
330 
331   bool parseSectionDirectiveObjCMetaClass(StringRef, SMLoc) {
332     return parseSectionSwitch("__OBJC", "__meta_class",
333                               MachO::S_ATTR_NO_DEAD_STRIP);
334   }
335 
336   bool parseSectionDirectiveObjCCatClsMeth(StringRef, SMLoc) {
337     return parseSectionSwitch("__OBJC", "__cat_cls_meth",
338                               MachO::S_ATTR_NO_DEAD_STRIP);
339   }
340 
341   bool parseSectionDirectiveObjCCatInstMeth(StringRef, SMLoc) {
342     return parseSectionSwitch("__OBJC", "__cat_inst_meth",
343                               MachO::S_ATTR_NO_DEAD_STRIP);
344   }
345 
346   bool parseSectionDirectiveObjCProtocol(StringRef, SMLoc) {
347     return parseSectionSwitch("__OBJC", "__protocol",
348                               MachO::S_ATTR_NO_DEAD_STRIP);
349   }
350 
351   bool parseSectionDirectiveObjCStringObject(StringRef, SMLoc) {
352     return parseSectionSwitch("__OBJC", "__string_object",
353                               MachO::S_ATTR_NO_DEAD_STRIP);
354   }
355 
356   bool parseSectionDirectiveObjCClsMeth(StringRef, SMLoc) {
357     return parseSectionSwitch("__OBJC", "__cls_meth",
358                               MachO::S_ATTR_NO_DEAD_STRIP);
359   }
360 
361   bool parseSectionDirectiveObjCInstMeth(StringRef, SMLoc) {
362     return parseSectionSwitch("__OBJC", "__inst_meth",
363                               MachO::S_ATTR_NO_DEAD_STRIP);
364   }
365 
366   bool parseSectionDirectiveObjCClsRefs(StringRef, SMLoc) {
367     return parseSectionSwitch("__OBJC", "__cls_refs",
368                               MachO::S_ATTR_NO_DEAD_STRIP |
369                               MachO::S_LITERAL_POINTERS, 4);
370   }
371 
372   bool parseSectionDirectiveObjCMessageRefs(StringRef, SMLoc) {
373     return parseSectionSwitch("__OBJC", "__message_refs",
374                               MachO::S_ATTR_NO_DEAD_STRIP |
375                               MachO::S_LITERAL_POINTERS, 4);
376   }
377 
378   bool parseSectionDirectiveObjCSymbols(StringRef, SMLoc) {
379     return parseSectionSwitch("__OBJC", "__symbols",
380                               MachO::S_ATTR_NO_DEAD_STRIP);
381   }
382 
383   bool parseSectionDirectiveObjCCategory(StringRef, SMLoc) {
384     return parseSectionSwitch("__OBJC", "__category",
385                               MachO::S_ATTR_NO_DEAD_STRIP);
386   }
387 
388   bool parseSectionDirectiveObjCClassVars(StringRef, SMLoc) {
389     return parseSectionSwitch("__OBJC", "__class_vars",
390                               MachO::S_ATTR_NO_DEAD_STRIP);
391   }
392 
393   bool parseSectionDirectiveObjCInstanceVars(StringRef, SMLoc) {
394     return parseSectionSwitch("__OBJC", "__instance_vars",
395                               MachO::S_ATTR_NO_DEAD_STRIP);
396   }
397 
398   bool parseSectionDirectiveObjCModuleInfo(StringRef, SMLoc) {
399     return parseSectionSwitch("__OBJC", "__module_info",
400                               MachO::S_ATTR_NO_DEAD_STRIP);
401   }
402 
403   bool parseSectionDirectiveObjCClassNames(StringRef, SMLoc) {
404     return parseSectionSwitch("__TEXT", "__cstring",
405                               MachO::S_CSTRING_LITERALS);
406   }
407 
408   bool parseSectionDirectiveObjCMethVarTypes(StringRef, SMLoc) {
409     return parseSectionSwitch("__TEXT", "__cstring",
410                               MachO::S_CSTRING_LITERALS);
411   }
412 
413   bool parseSectionDirectiveObjCMethVarNames(StringRef, SMLoc) {
414     return parseSectionSwitch("__TEXT", "__cstring",
415                               MachO::S_CSTRING_LITERALS);
416   }
417 
418   bool parseSectionDirectiveObjCSelectorStrs(StringRef, SMLoc) {
419     return parseSectionSwitch("__OBJC", "__selector_strs",
420                               MachO::S_CSTRING_LITERALS);
421   }
422 
423   bool parseSectionDirectiveTData(StringRef, SMLoc) {
424     return parseSectionSwitch("__DATA", "__thread_data",
425                               MachO::S_THREAD_LOCAL_REGULAR);
426   }
427 
428   bool parseSectionDirectiveText(StringRef, SMLoc) {
429     return parseSectionSwitch("__TEXT", "__text",
430                               MachO::S_ATTR_PURE_INSTRUCTIONS);
431   }
432 
433   bool parseSectionDirectiveTLV(StringRef, SMLoc) {
434     return parseSectionSwitch("__DATA", "__thread_vars",
435                               MachO::S_THREAD_LOCAL_VARIABLES);
436   }
437 
438   bool parseSectionDirectiveIdent(StringRef, SMLoc) {
439     // Darwin silently ignores the .ident directive.
440     getParser().eatToEndOfStatement();
441     return false;
442   }
443 
444   bool parseSectionDirectiveThreadInitFunc(StringRef, SMLoc) {
445     return parseSectionSwitch("__DATA", "__thread_init",
446                          MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS);
447   }
448 
449   bool parseWatchOSVersionMin(StringRef Directive, SMLoc Loc) {
450     return parseVersionMin(Directive, Loc, MCVM_WatchOSVersionMin);
451   }
452   bool parseTvOSVersionMin(StringRef Directive, SMLoc Loc) {
453     return parseVersionMin(Directive, Loc, MCVM_TvOSVersionMin);
454   }
455   bool parseIOSVersionMin(StringRef Directive, SMLoc Loc) {
456     return parseVersionMin(Directive, Loc, MCVM_IOSVersionMin);
457   }
458   bool parseMacOSXVersionMin(StringRef Directive, SMLoc Loc) {
459     return parseVersionMin(Directive, Loc, MCVM_OSXVersionMin);
460   }
461 
462   bool parseBuildVersion(StringRef Directive, SMLoc Loc);
463   bool parseVersionMin(StringRef Directive, SMLoc Loc, MCVersionMinType Type);
464   bool parseMajorMinorVersionComponent(unsigned *Major, unsigned *Minor,
465                                        const char *VersionName);
466   bool parseOptionalTrailingVersionComponent(unsigned *Component,
467                                              const char *ComponentName);
468   bool parseVersion(unsigned *Major, unsigned *Minor, unsigned *Update);
469   bool parseSDKVersion(VersionTuple &SDKVersion);
470   void checkVersion(StringRef Directive, StringRef Arg, SMLoc Loc,
471                     Triple::OSType ExpectedOS);
472   bool parseDirectiveCGProfile(StringRef Directive, SMLoc Loc);
473 };
474 
475 } // end anonymous namespace
476 
477 bool DarwinAsmParser::parseSectionSwitch(StringRef Segment, StringRef Section,
478                                          unsigned TAA, unsigned Align,
479                                          unsigned StubSize) {
480   if (getLexer().isNot(AsmToken::EndOfStatement))
481     return TokError("unexpected token in section switching directive");
482   Lex();
483 
484   // FIXME: Arch specific.
485   bool isText = TAA & MachO::S_ATTR_PURE_INSTRUCTIONS;
486   getStreamer().SwitchSection(getContext().getMachOSection(
487       Segment, Section, TAA, StubSize,
488       isText ? SectionKind::getText() : SectionKind::getData()));
489 
490   // Set the implicit alignment, if any.
491   //
492   // FIXME: This isn't really what 'as' does; I think it just uses the implicit
493   // alignment on the section (e.g., if one manually inserts bytes into the
494   // section, then just issuing the section switch directive will not realign
495   // the section. However, this is arguably more reasonable behavior, and there
496   // is no good reason for someone to intentionally emit incorrectly sized
497   // values into the implicitly aligned sections.
498   if (Align)
499     getStreamer().emitValueToAlignment(Align);
500 
501   return false;
502 }
503 
504 /// parseDirectiveAltEntry
505 ///  ::= .alt_entry identifier
506 bool DarwinAsmParser::parseDirectiveAltEntry(StringRef, SMLoc) {
507   StringRef Name;
508   if (getParser().parseIdentifier(Name))
509     return TokError("expected identifier in directive");
510 
511   // Look up symbol.
512   MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
513 
514   if (Sym->isDefined())
515     return TokError(".alt_entry must preceed symbol definition");
516 
517   if (!getStreamer().emitSymbolAttribute(Sym, MCSA_AltEntry))
518     return TokError("unable to emit symbol attribute");
519 
520   Lex();
521   return false;
522 }
523 
524 /// parseDirectiveDesc
525 ///  ::= .desc identifier , expression
526 bool DarwinAsmParser::parseDirectiveDesc(StringRef, SMLoc) {
527   StringRef Name;
528   if (getParser().parseIdentifier(Name))
529     return TokError("expected identifier in directive");
530 
531   // Handle the identifier as the key symbol.
532   MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
533 
534   if (getLexer().isNot(AsmToken::Comma))
535     return TokError("unexpected token in '.desc' directive");
536   Lex();
537 
538   int64_t DescValue;
539   if (getParser().parseAbsoluteExpression(DescValue))
540     return true;
541 
542   if (getLexer().isNot(AsmToken::EndOfStatement))
543     return TokError("unexpected token in '.desc' directive");
544 
545   Lex();
546 
547   // Set the n_desc field of this Symbol to this DescValue
548   getStreamer().emitSymbolDesc(Sym, DescValue);
549 
550   return false;
551 }
552 
553 /// parseDirectiveIndirectSymbol
554 ///  ::= .indirect_symbol identifier
555 bool DarwinAsmParser::parseDirectiveIndirectSymbol(StringRef, SMLoc Loc) {
556   const MCSectionMachO *Current = static_cast<const MCSectionMachO *>(
557       getStreamer().getCurrentSectionOnly());
558   MachO::SectionType SectionType = Current->getType();
559   if (SectionType != MachO::S_NON_LAZY_SYMBOL_POINTERS &&
560       SectionType != MachO::S_LAZY_SYMBOL_POINTERS &&
561       SectionType != MachO::S_THREAD_LOCAL_VARIABLE_POINTERS &&
562       SectionType != MachO::S_SYMBOL_STUBS)
563     return Error(Loc, "indirect symbol not in a symbol pointer or stub "
564                       "section");
565 
566   StringRef Name;
567   if (getParser().parseIdentifier(Name))
568     return TokError("expected identifier in .indirect_symbol directive");
569 
570   MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
571 
572   // Assembler local symbols don't make any sense here. Complain loudly.
573   if (Sym->isTemporary())
574     return TokError("non-local symbol required in directive");
575 
576   if (!getStreamer().emitSymbolAttribute(Sym, MCSA_IndirectSymbol))
577     return TokError("unable to emit indirect symbol attribute for: " + Name);
578 
579   if (getLexer().isNot(AsmToken::EndOfStatement))
580     return TokError("unexpected token in '.indirect_symbol' directive");
581 
582   Lex();
583 
584   return false;
585 }
586 
587 /// parseDirectiveDumpOrLoad
588 ///  ::= ( .dump | .load ) "filename"
589 bool DarwinAsmParser::parseDirectiveDumpOrLoad(StringRef Directive,
590                                                SMLoc IDLoc) {
591   bool IsDump = Directive == ".dump";
592   if (getLexer().isNot(AsmToken::String))
593     return TokError("expected string in '.dump' or '.load' directive");
594 
595   Lex();
596 
597   if (getLexer().isNot(AsmToken::EndOfStatement))
598     return TokError("unexpected token in '.dump' or '.load' directive");
599 
600   Lex();
601 
602   // FIXME: If/when .dump and .load are implemented they will be done in the
603   // the assembly parser and not have any need for an MCStreamer API.
604   if (IsDump)
605     return Warning(IDLoc, "ignoring directive .dump for now");
606   else
607     return Warning(IDLoc, "ignoring directive .load for now");
608 }
609 
610 /// ParseDirectiveLinkerOption
611 ///  ::= .linker_option "string" ( , "string" )*
612 bool DarwinAsmParser::parseDirectiveLinkerOption(StringRef IDVal, SMLoc) {
613   SmallVector<std::string, 4> Args;
614   while (true) {
615     if (getLexer().isNot(AsmToken::String))
616       return TokError("expected string in '" + Twine(IDVal) + "' directive");
617 
618     std::string Data;
619     if (getParser().parseEscapedString(Data))
620       return true;
621 
622     Args.push_back(Data);
623 
624     if (getLexer().is(AsmToken::EndOfStatement))
625       break;
626 
627     if (getLexer().isNot(AsmToken::Comma))
628       return TokError("unexpected token in '" + Twine(IDVal) + "' directive");
629     Lex();
630   }
631 
632   getStreamer().emitLinkerOptions(Args);
633   return false;
634 }
635 
636 /// parseDirectiveLsym
637 ///  ::= .lsym identifier , expression
638 bool DarwinAsmParser::parseDirectiveLsym(StringRef, SMLoc) {
639   StringRef Name;
640   if (getParser().parseIdentifier(Name))
641     return TokError("expected identifier in directive");
642 
643   // Handle the identifier as the key symbol.
644   MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
645 
646   if (getLexer().isNot(AsmToken::Comma))
647     return TokError("unexpected token in '.lsym' directive");
648   Lex();
649 
650   const MCExpr *Value;
651   if (getParser().parseExpression(Value))
652     return true;
653 
654   if (getLexer().isNot(AsmToken::EndOfStatement))
655     return TokError("unexpected token in '.lsym' directive");
656 
657   Lex();
658 
659   // We don't currently support this directive.
660   //
661   // FIXME: Diagnostic location!
662   (void) Sym;
663   return TokError("directive '.lsym' is unsupported");
664 }
665 
666 /// parseDirectiveSection:
667 ///   ::= .section identifier (',' identifier)*
668 bool DarwinAsmParser::parseDirectiveSection(StringRef, SMLoc) {
669   SMLoc Loc = getLexer().getLoc();
670 
671   StringRef SectionName;
672   if (getParser().parseIdentifier(SectionName))
673     return Error(Loc, "expected identifier after '.section' directive");
674 
675   // Verify there is a following comma.
676   if (!getLexer().is(AsmToken::Comma))
677     return TokError("unexpected token in '.section' directive");
678 
679   std::string SectionSpec = std::string(SectionName);
680   SectionSpec += ",";
681 
682   // Add all the tokens until the end of the line, ParseSectionSpecifier will
683   // handle this.
684   StringRef EOL = getLexer().LexUntilEndOfStatement();
685   SectionSpec.append(EOL.begin(), EOL.end());
686 
687   Lex();
688   if (getLexer().isNot(AsmToken::EndOfStatement))
689     return TokError("unexpected token in '.section' directive");
690   Lex();
691 
692   StringRef Segment, Section;
693   unsigned StubSize;
694   unsigned TAA;
695   bool TAAParsed;
696   if (class Error E = MCSectionMachO::ParseSectionSpecifier(
697           SectionSpec, Segment, Section, TAA, TAAParsed, StubSize))
698     return Error(Loc, toString(std::move(E)));
699 
700   // Issue a warning if the target is not powerpc and Section is a *coal* section.
701   Triple TT = getParser().getContext().getTargetTriple();
702   Triple::ArchType ArchTy = TT.getArch();
703 
704   if (ArchTy != Triple::ppc && ArchTy != Triple::ppc64) {
705     StringRef NonCoalSection = StringSwitch<StringRef>(Section)
706                                    .Case("__textcoal_nt", "__text")
707                                    .Case("__const_coal", "__const")
708                                    .Case("__datacoal_nt", "__data")
709                                    .Default(Section);
710 
711     if (!Section.equals(NonCoalSection)) {
712       StringRef SectionVal(Loc.getPointer());
713       size_t B = SectionVal.find(',') + 1, E = SectionVal.find(',', B);
714       SMLoc BLoc = SMLoc::getFromPointer(SectionVal.data() + B);
715       SMLoc ELoc = SMLoc::getFromPointer(SectionVal.data() + E);
716       getParser().Warning(Loc, "section \"" + Section + "\" is deprecated",
717                           SMRange(BLoc, ELoc));
718       getParser().Note(Loc, "change section name to \"" + NonCoalSection +
719                        "\"", SMRange(BLoc, ELoc));
720     }
721   }
722 
723   // FIXME: Arch specific.
724   bool isText = Segment == "__TEXT";  // FIXME: Hack.
725   getStreamer().SwitchSection(getContext().getMachOSection(
726       Segment, Section, TAA, StubSize,
727       isText ? SectionKind::getText() : SectionKind::getData()));
728   return false;
729 }
730 
731 /// ParseDirectivePushSection:
732 ///   ::= .pushsection identifier (',' identifier)*
733 bool DarwinAsmParser::parseDirectivePushSection(StringRef S, SMLoc Loc) {
734   getStreamer().PushSection();
735 
736   if (parseDirectiveSection(S, Loc)) {
737     getStreamer().PopSection();
738     return true;
739   }
740 
741   return false;
742 }
743 
744 /// ParseDirectivePopSection:
745 ///   ::= .popsection
746 bool DarwinAsmParser::parseDirectivePopSection(StringRef, SMLoc) {
747   if (!getStreamer().PopSection())
748     return TokError(".popsection without corresponding .pushsection");
749   return false;
750 }
751 
752 /// ParseDirectivePrevious:
753 ///   ::= .previous
754 bool DarwinAsmParser::parseDirectivePrevious(StringRef DirName, SMLoc) {
755   MCSectionSubPair PreviousSection = getStreamer().getPreviousSection();
756   if (!PreviousSection.first)
757     return TokError(".previous without corresponding .section");
758   getStreamer().SwitchSection(PreviousSection.first, PreviousSection.second);
759   return false;
760 }
761 
762 /// ParseDirectiveSecureLogUnique
763 ///  ::= .secure_log_unique ... message ...
764 bool DarwinAsmParser::parseDirectiveSecureLogUnique(StringRef, SMLoc IDLoc) {
765   StringRef LogMessage = getParser().parseStringToEndOfStatement();
766   if (getLexer().isNot(AsmToken::EndOfStatement))
767     return TokError("unexpected token in '.secure_log_unique' directive");
768 
769   if (getContext().getSecureLogUsed())
770     return Error(IDLoc, ".secure_log_unique specified multiple times");
771 
772   // Get the secure log path.
773   const char *SecureLogFile = getContext().getSecureLogFile();
774   if (!SecureLogFile)
775     return Error(IDLoc, ".secure_log_unique used but AS_SECURE_LOG_FILE "
776                  "environment variable unset.");
777 
778   // Open the secure log file if we haven't already.
779   raw_fd_ostream *OS = getContext().getSecureLog();
780   if (!OS) {
781     std::error_code EC;
782     auto NewOS = std::make_unique<raw_fd_ostream>(StringRef(SecureLogFile), EC,
783                                                   sys::fs::OF_Append |
784                                                       sys::fs::OF_TextWithCRLF);
785     if (EC)
786        return Error(IDLoc, Twine("can't open secure log file: ") +
787                                SecureLogFile + " (" + EC.message() + ")");
788     OS = NewOS.get();
789     getContext().setSecureLog(std::move(NewOS));
790   }
791 
792   // Write the message.
793   unsigned CurBuf = getSourceManager().FindBufferContainingLoc(IDLoc);
794   *OS << getSourceManager().getBufferInfo(CurBuf).Buffer->getBufferIdentifier()
795       << ":" << getSourceManager().FindLineNumber(IDLoc, CurBuf) << ":"
796       << LogMessage + "\n";
797 
798   getContext().setSecureLogUsed(true);
799 
800   return false;
801 }
802 
803 /// ParseDirectiveSecureLogReset
804 ///  ::= .secure_log_reset
805 bool DarwinAsmParser::parseDirectiveSecureLogReset(StringRef, SMLoc IDLoc) {
806   if (getLexer().isNot(AsmToken::EndOfStatement))
807     return TokError("unexpected token in '.secure_log_reset' directive");
808 
809   Lex();
810 
811   getContext().setSecureLogUsed(false);
812 
813   return false;
814 }
815 
816 /// parseDirectiveSubsectionsViaSymbols
817 ///  ::= .subsections_via_symbols
818 bool DarwinAsmParser::parseDirectiveSubsectionsViaSymbols(StringRef, SMLoc) {
819   if (getLexer().isNot(AsmToken::EndOfStatement))
820     return TokError("unexpected token in '.subsections_via_symbols' directive");
821 
822   Lex();
823 
824   getStreamer().emitAssemblerFlag(MCAF_SubsectionsViaSymbols);
825 
826   return false;
827 }
828 
829 /// ParseDirectiveTBSS
830 ///  ::= .tbss identifier, size, align
831 bool DarwinAsmParser::parseDirectiveTBSS(StringRef, SMLoc) {
832   SMLoc IDLoc = getLexer().getLoc();
833   StringRef Name;
834   if (getParser().parseIdentifier(Name))
835     return TokError("expected identifier in directive");
836 
837   // Handle the identifier as the key symbol.
838   MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
839 
840   if (getLexer().isNot(AsmToken::Comma))
841     return TokError("unexpected token in directive");
842   Lex();
843 
844   int64_t Size;
845   SMLoc SizeLoc = getLexer().getLoc();
846   if (getParser().parseAbsoluteExpression(Size))
847     return true;
848 
849   int64_t Pow2Alignment = 0;
850   SMLoc Pow2AlignmentLoc;
851   if (getLexer().is(AsmToken::Comma)) {
852     Lex();
853     Pow2AlignmentLoc = getLexer().getLoc();
854     if (getParser().parseAbsoluteExpression(Pow2Alignment))
855       return true;
856   }
857 
858   if (getLexer().isNot(AsmToken::EndOfStatement))
859     return TokError("unexpected token in '.tbss' directive");
860 
861   Lex();
862 
863   if (Size < 0)
864     return Error(SizeLoc, "invalid '.tbss' directive size, can't be less than"
865                  "zero");
866 
867   // FIXME: Diagnose overflow.
868   if (Pow2Alignment < 0)
869     return Error(Pow2AlignmentLoc, "invalid '.tbss' alignment, can't be less"
870                  "than zero");
871 
872   if (!Sym->isUndefined())
873     return Error(IDLoc, "invalid symbol redefinition");
874 
875   getStreamer().emitTBSSSymbol(
876       getContext().getMachOSection("__DATA", "__thread_bss",
877                                    MachO::S_THREAD_LOCAL_ZEROFILL, 0,
878                                    SectionKind::getThreadBSS()),
879       Sym, Size, 1 << Pow2Alignment);
880 
881   return false;
882 }
883 
884 /// ParseDirectiveZerofill
885 ///  ::= .zerofill segname , sectname [, identifier , size_expression [
886 ///      , align_expression ]]
887 bool DarwinAsmParser::parseDirectiveZerofill(StringRef, SMLoc) {
888   StringRef Segment;
889   if (getParser().parseIdentifier(Segment))
890     return TokError("expected segment name after '.zerofill' directive");
891 
892   if (getLexer().isNot(AsmToken::Comma))
893     return TokError("unexpected token in directive");
894   Lex();
895 
896   StringRef Section;
897   SMLoc SectionLoc = getLexer().getLoc();
898   if (getParser().parseIdentifier(Section))
899     return TokError("expected section name after comma in '.zerofill' "
900                     "directive");
901 
902   // If this is the end of the line all that was wanted was to create the
903   // the section but with no symbol.
904   if (getLexer().is(AsmToken::EndOfStatement)) {
905     // Create the zerofill section but no symbol
906     getStreamer().emitZerofill(
907         getContext().getMachOSection(Segment, Section, MachO::S_ZEROFILL, 0,
908                                      SectionKind::getBSS()),
909         /*Symbol=*/nullptr, /*Size=*/0, /*ByteAlignment=*/0, SectionLoc);
910     return false;
911   }
912 
913   if (getLexer().isNot(AsmToken::Comma))
914     return TokError("unexpected token in directive");
915   Lex();
916 
917   SMLoc IDLoc = getLexer().getLoc();
918   StringRef IDStr;
919   if (getParser().parseIdentifier(IDStr))
920     return TokError("expected identifier in directive");
921 
922   // handle the identifier as the key symbol.
923   MCSymbol *Sym = getContext().getOrCreateSymbol(IDStr);
924 
925   if (getLexer().isNot(AsmToken::Comma))
926     return TokError("unexpected token in directive");
927   Lex();
928 
929   int64_t Size;
930   SMLoc SizeLoc = getLexer().getLoc();
931   if (getParser().parseAbsoluteExpression(Size))
932     return true;
933 
934   int64_t Pow2Alignment = 0;
935   SMLoc Pow2AlignmentLoc;
936   if (getLexer().is(AsmToken::Comma)) {
937     Lex();
938     Pow2AlignmentLoc = getLexer().getLoc();
939     if (getParser().parseAbsoluteExpression(Pow2Alignment))
940       return true;
941   }
942 
943   if (getLexer().isNot(AsmToken::EndOfStatement))
944     return TokError("unexpected token in '.zerofill' directive");
945 
946   Lex();
947 
948   if (Size < 0)
949     return Error(SizeLoc, "invalid '.zerofill' directive size, can't be less "
950                  "than zero");
951 
952   // NOTE: The alignment in the directive is a power of 2 value, the assembler
953   // may internally end up wanting an alignment in bytes.
954   // FIXME: Diagnose overflow.
955   if (Pow2Alignment < 0)
956     return Error(Pow2AlignmentLoc, "invalid '.zerofill' directive alignment, "
957                  "can't be less than zero");
958 
959   if (!Sym->isUndefined())
960     return Error(IDLoc, "invalid symbol redefinition");
961 
962   // Create the zerofill Symbol with Size and Pow2Alignment
963   //
964   // FIXME: Arch specific.
965   getStreamer().emitZerofill(getContext().getMachOSection(
966                                Segment, Section, MachO::S_ZEROFILL,
967                                0, SectionKind::getBSS()),
968                              Sym, Size, 1 << Pow2Alignment, SectionLoc);
969 
970   return false;
971 }
972 
973 /// ParseDirectiveDataRegion
974 ///  ::= .data_region [ ( jt8 | jt16 | jt32 ) ]
975 bool DarwinAsmParser::parseDirectiveDataRegion(StringRef, SMLoc) {
976   if (getLexer().is(AsmToken::EndOfStatement)) {
977     Lex();
978     getStreamer().emitDataRegion(MCDR_DataRegion);
979     return false;
980   }
981   StringRef RegionType;
982   SMLoc Loc = getParser().getTok().getLoc();
983   if (getParser().parseIdentifier(RegionType))
984     return TokError("expected region type after '.data_region' directive");
985   int Kind = StringSwitch<int>(RegionType)
986     .Case("jt8", MCDR_DataRegionJT8)
987     .Case("jt16", MCDR_DataRegionJT16)
988     .Case("jt32", MCDR_DataRegionJT32)
989     .Default(-1);
990   if (Kind == -1)
991     return Error(Loc, "unknown region type in '.data_region' directive");
992   Lex();
993 
994   getStreamer().emitDataRegion((MCDataRegionType)Kind);
995   return false;
996 }
997 
998 /// ParseDirectiveDataRegionEnd
999 ///  ::= .end_data_region
1000 bool DarwinAsmParser::parseDirectiveDataRegionEnd(StringRef, SMLoc) {
1001   if (getLexer().isNot(AsmToken::EndOfStatement))
1002     return TokError("unexpected token in '.end_data_region' directive");
1003 
1004   Lex();
1005   getStreamer().emitDataRegion(MCDR_DataRegionEnd);
1006   return false;
1007 }
1008 
1009 static bool isSDKVersionToken(const AsmToken &Tok) {
1010   return Tok.is(AsmToken::Identifier) && Tok.getIdentifier() == "sdk_version";
1011 }
1012 
1013 /// parseMajorMinorVersionComponent ::= major, minor
1014 bool DarwinAsmParser::parseMajorMinorVersionComponent(unsigned *Major,
1015                                                       unsigned *Minor,
1016                                                       const char *VersionName) {
1017   // Get the major version number.
1018   if (getLexer().isNot(AsmToken::Integer))
1019     return TokError(Twine("invalid ") + VersionName +
1020                     " major version number, integer expected");
1021   int64_t MajorVal = getLexer().getTok().getIntVal();
1022   if (MajorVal > 65535 || MajorVal <= 0)
1023     return TokError(Twine("invalid ") + VersionName + " major version number");
1024   *Major = (unsigned)MajorVal;
1025   Lex();
1026   if (getLexer().isNot(AsmToken::Comma))
1027     return TokError(Twine(VersionName) +
1028                     " minor version number required, comma expected");
1029   Lex();
1030   // Get the minor version number.
1031   if (getLexer().isNot(AsmToken::Integer))
1032     return TokError(Twine("invalid ") + VersionName +
1033                     " minor version number, integer expected");
1034   int64_t MinorVal = getLexer().getTok().getIntVal();
1035   if (MinorVal > 255 || MinorVal < 0)
1036     return TokError(Twine("invalid ") + VersionName + " minor version number");
1037   *Minor = MinorVal;
1038   Lex();
1039   return false;
1040 }
1041 
1042 /// parseOptionalTrailingVersionComponent ::= , version_number
1043 bool DarwinAsmParser::parseOptionalTrailingVersionComponent(
1044     unsigned *Component, const char *ComponentName) {
1045   assert(getLexer().is(AsmToken::Comma) && "comma expected");
1046   Lex();
1047   if (getLexer().isNot(AsmToken::Integer))
1048     return TokError(Twine("invalid ") + ComponentName +
1049                     " version number, integer expected");
1050   int64_t Val = getLexer().getTok().getIntVal();
1051   if (Val > 255 || Val < 0)
1052     return TokError(Twine("invalid ") + ComponentName + " version number");
1053   *Component = Val;
1054   Lex();
1055   return false;
1056 }
1057 
1058 /// parseVersion ::= parseMajorMinorVersionComponent
1059 ///                      parseOptionalTrailingVersionComponent
1060 bool DarwinAsmParser::parseVersion(unsigned *Major, unsigned *Minor,
1061                                    unsigned *Update) {
1062   if (parseMajorMinorVersionComponent(Major, Minor, "OS"))
1063     return true;
1064 
1065   // Get the update level, if specified
1066   *Update = 0;
1067   if (getLexer().is(AsmToken::EndOfStatement) ||
1068       isSDKVersionToken(getLexer().getTok()))
1069     return false;
1070   if (getLexer().isNot(AsmToken::Comma))
1071     return TokError("invalid OS update specifier, comma expected");
1072   if (parseOptionalTrailingVersionComponent(Update, "OS update"))
1073     return true;
1074   return false;
1075 }
1076 
1077 bool DarwinAsmParser::parseSDKVersion(VersionTuple &SDKVersion) {
1078   assert(isSDKVersionToken(getLexer().getTok()) && "expected sdk_version");
1079   Lex();
1080   unsigned Major, Minor;
1081   if (parseMajorMinorVersionComponent(&Major, &Minor, "SDK"))
1082     return true;
1083   SDKVersion = VersionTuple(Major, Minor);
1084 
1085   // Get the subminor version, if specified.
1086   if (getLexer().is(AsmToken::Comma)) {
1087     unsigned Subminor;
1088     if (parseOptionalTrailingVersionComponent(&Subminor, "SDK subminor"))
1089       return true;
1090     SDKVersion = VersionTuple(Major, Minor, Subminor);
1091   }
1092   return false;
1093 }
1094 
1095 void DarwinAsmParser::checkVersion(StringRef Directive, StringRef Arg,
1096                                    SMLoc Loc, Triple::OSType ExpectedOS) {
1097   const Triple &Target = getContext().getTargetTriple();
1098   if (Target.getOS() != ExpectedOS)
1099     Warning(Loc, Twine(Directive) +
1100             (Arg.empty() ? Twine() : Twine(' ') + Arg) +
1101             " used while targeting " + Target.getOSName());
1102 
1103   if (LastVersionDirective.isValid()) {
1104     Warning(Loc, "overriding previous version directive");
1105     Note(LastVersionDirective, "previous definition is here");
1106   }
1107   LastVersionDirective = Loc;
1108 }
1109 
1110 static Triple::OSType getOSTypeFromMCVM(MCVersionMinType Type) {
1111   switch (Type) {
1112   case MCVM_WatchOSVersionMin: return Triple::WatchOS;
1113   case MCVM_TvOSVersionMin:    return Triple::TvOS;
1114   case MCVM_IOSVersionMin:     return Triple::IOS;
1115   case MCVM_OSXVersionMin:     return Triple::MacOSX;
1116   }
1117   llvm_unreachable("Invalid mc version min type");
1118 }
1119 
1120 /// parseVersionMin
1121 ///   ::= .ios_version_min parseVersion parseSDKVersion
1122 ///   |   .macosx_version_min parseVersion parseSDKVersion
1123 ///   |   .tvos_version_min parseVersion parseSDKVersion
1124 ///   |   .watchos_version_min parseVersion parseSDKVersion
1125 bool DarwinAsmParser::parseVersionMin(StringRef Directive, SMLoc Loc,
1126                                       MCVersionMinType Type) {
1127   unsigned Major;
1128   unsigned Minor;
1129   unsigned Update;
1130   if (parseVersion(&Major, &Minor, &Update))
1131     return true;
1132 
1133   VersionTuple SDKVersion;
1134   if (isSDKVersionToken(getLexer().getTok()) && parseSDKVersion(SDKVersion))
1135     return true;
1136 
1137   if (parseToken(AsmToken::EndOfStatement))
1138     return addErrorSuffix(Twine(" in '") + Directive + "' directive");
1139 
1140   Triple::OSType ExpectedOS = getOSTypeFromMCVM(Type);
1141   checkVersion(Directive, StringRef(), Loc, ExpectedOS);
1142   getStreamer().emitVersionMin(Type, Major, Minor, Update, SDKVersion);
1143   return false;
1144 }
1145 
1146 static Triple::OSType getOSTypeFromPlatform(MachO::PlatformType Type) {
1147   switch (Type) {
1148   case MachO::PLATFORM_UNKNOWN: /* silence warning */
1149     break;
1150   case MachO::PLATFORM_MACOS:   return Triple::MacOSX;
1151   case MachO::PLATFORM_IOS:     return Triple::IOS;
1152   case MachO::PLATFORM_TVOS:    return Triple::TvOS;
1153   case MachO::PLATFORM_WATCHOS: return Triple::WatchOS;
1154   case MachO::PLATFORM_BRIDGEOS:         /* silence warning */ break;
1155   case MachO::PLATFORM_MACCATALYST: return Triple::IOS;
1156   case MachO::PLATFORM_IOSSIMULATOR:     /* silence warning */ break;
1157   case MachO::PLATFORM_TVOSSIMULATOR:    /* silence warning */ break;
1158   case MachO::PLATFORM_WATCHOSSIMULATOR: /* silence warning */ break;
1159   case MachO::PLATFORM_DRIVERKIT:        /* silence warning */ break;
1160   }
1161   llvm_unreachable("Invalid mach-o platform type");
1162 }
1163 
1164 /// parseBuildVersion
1165 ///   ::= .build_version (macos|ios|tvos|watchos), parseVersion parseSDKVersion
1166 bool DarwinAsmParser::parseBuildVersion(StringRef Directive, SMLoc Loc) {
1167   StringRef PlatformName;
1168   SMLoc PlatformLoc = getTok().getLoc();
1169   if (getParser().parseIdentifier(PlatformName))
1170     return TokError("platform name expected");
1171 
1172   unsigned Platform = StringSwitch<unsigned>(PlatformName)
1173     .Case("macos", MachO::PLATFORM_MACOS)
1174     .Case("ios", MachO::PLATFORM_IOS)
1175     .Case("tvos", MachO::PLATFORM_TVOS)
1176     .Case("watchos", MachO::PLATFORM_WATCHOS)
1177     .Case("macCatalyst", MachO::PLATFORM_MACCATALYST)
1178     .Default(0);
1179   if (Platform == 0)
1180     return Error(PlatformLoc, "unknown platform name");
1181 
1182   if (getLexer().isNot(AsmToken::Comma))
1183     return TokError("version number required, comma expected");
1184   Lex();
1185 
1186   unsigned Major;
1187   unsigned Minor;
1188   unsigned Update;
1189   if (parseVersion(&Major, &Minor, &Update))
1190     return true;
1191 
1192   VersionTuple SDKVersion;
1193   if (isSDKVersionToken(getLexer().getTok()) && parseSDKVersion(SDKVersion))
1194     return true;
1195 
1196   if (parseToken(AsmToken::EndOfStatement))
1197     return addErrorSuffix(" in '.build_version' directive");
1198 
1199   Triple::OSType ExpectedOS
1200     = getOSTypeFromPlatform((MachO::PlatformType)Platform);
1201   checkVersion(Directive, PlatformName, Loc, ExpectedOS);
1202   getStreamer().emitBuildVersion(Platform, Major, Minor, Update, SDKVersion);
1203   return false;
1204 }
1205 
1206 /// parseDirectiveCGProfile
1207 ///   ::= .cg_profile from, to, count
1208 bool DarwinAsmParser::parseDirectiveCGProfile(StringRef S, SMLoc Loc) {
1209   return MCAsmParserExtension::ParseDirectiveCGProfile(S, Loc);
1210 }
1211 
1212 namespace llvm {
1213 
1214 MCAsmParserExtension *createDarwinAsmParser() {
1215   return new DarwinAsmParser;
1216 }
1217 
1218 } // end llvm namespace
1219