1 //===- DarwinAsmParser.cpp - Darwin (Mach-O) Assembly Parser --------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 #include "llvm/MC/MCParser/MCAsmParserExtension.h"
11 #include "llvm/MC/MCContext.h"
12 #include "llvm/MC/MCSectionMachO.h"
13 #include "llvm/MC/MCStreamer.h"
14 #include "llvm/MC/MCSymbol.h"
15 #include "llvm/MC/MCParser/MCAsmLexer.h"
16 #include "llvm/MC/MCParser/MCAsmParser.h"
17 #include "llvm/ADT/StringRef.h"
18 #include "llvm/ADT/Twine.h"
19 #include "llvm/Support/MemoryBuffer.h"
20 #include "llvm/Support/SourceMgr.h"
21 using namespace llvm;
22
23 namespace {
24
25 /// \brief Implementation of directive handling which is shared across all
26 /// Darwin targets.
27 class DarwinAsmParser : public MCAsmParserExtension {
28 template<bool (DarwinAsmParser::*Handler)(StringRef, SMLoc)>
AddDirectiveHandler(StringRef Directive)29 void AddDirectiveHandler(StringRef Directive) {
30 getParser().AddDirectiveHandler(this, Directive,
31 HandleDirective<DarwinAsmParser, Handler>);
32 }
33
34 bool ParseSectionSwitch(const char *Segment, const char *Section,
35 unsigned TAA = 0, unsigned ImplicitAlign = 0,
36 unsigned StubSize = 0);
37
38 public:
DarwinAsmParser()39 DarwinAsmParser() {}
40
Initialize(MCAsmParser & Parser)41 virtual void Initialize(MCAsmParser &Parser) {
42 // Call the base implementation.
43 this->MCAsmParserExtension::Initialize(Parser);
44
45 AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveDesc>(".desc");
46 AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveLsym>(".lsym");
47 AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveSubsectionsViaSymbols>(
48 ".subsections_via_symbols");
49 AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveDumpOrLoad>(".dump");
50 AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveDumpOrLoad>(".load");
51 AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveSection>(".section");
52 AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveSecureLogUnique>(
53 ".secure_log_unique");
54 AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveSecureLogReset>(
55 ".secure_log_reset");
56 AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveTBSS>(".tbss");
57 AddDirectiveHandler<&DarwinAsmParser::ParseDirectiveZerofill>(".zerofill");
58
59 // Special section directives.
60 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveConst>(".const");
61 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveConstData>(".const_data");
62 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveConstructor>(".constructor");
63 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveCString>(".cstring");
64 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveData>(".data");
65 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveDestructor>(".destructor");
66 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveDyld>(".dyld");
67 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveFVMLibInit0>(".fvmlib_init0");
68 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveFVMLibInit1>(".fvmlib_init1");
69 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveLazySymbolPointers>(".lazy_symbol_pointer");
70 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveLiteral16>(".literal16");
71 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveLiteral4>(".literal4");
72 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveLiteral8>(".literal8");
73 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveModInitFunc>(".mod_init_func");
74 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveModTermFunc>(".mod_term_func");
75 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveNonLazySymbolPointers>(".non_lazy_symbol_pointer");
76 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCCatClsMeth>(".objc_cat_cls_meth");
77 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCCatInstMeth>(".objc_cat_inst_meth");
78 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCCategory>(".objc_category");
79 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCClass>(".objc_class");
80 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCClassNames>(".objc_class_names");
81 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCClassVars>(".objc_class_vars");
82 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCClsMeth>(".objc_cls_meth");
83 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCClsRefs>(".objc_cls_refs");
84 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCInstMeth>(".objc_inst_meth");
85 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCInstanceVars>(".objc_instance_vars");
86 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCMessageRefs>(".objc_message_refs");
87 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCMetaClass>(".objc_meta_class");
88 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCMethVarNames>(".objc_meth_var_names");
89 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCMethVarTypes>(".objc_meth_var_types");
90 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCModuleInfo>(".objc_module_info");
91 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCProtocol>(".objc_protocol");
92 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCSelectorStrs>(".objc_selector_strs");
93 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCStringObject>(".objc_string_object");
94 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveObjCSymbols>(".objc_symbols");
95 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectivePICSymbolStub>(".picsymbol_stub");
96 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveStaticConst>(".static_const");
97 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveStaticData>(".static_data");
98 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveSymbolStub>(".symbol_stub");
99 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveTData>(".tdata");
100 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveText>(".text");
101 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveThreadInitFunc>(".thread_init_func");
102 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveTLV>(".tlv");
103
104 AddDirectiveHandler<&DarwinAsmParser::ParseSectionDirectiveIdent>(".ident");
105 }
106
107 bool ParseDirectiveDesc(StringRef, SMLoc);
108 bool ParseDirectiveDumpOrLoad(StringRef, SMLoc);
109 bool ParseDirectiveLsym(StringRef, SMLoc);
110 bool ParseDirectiveSection(StringRef, SMLoc);
111 bool ParseDirectiveSecureLogReset(StringRef, SMLoc);
112 bool ParseDirectiveSecureLogUnique(StringRef, SMLoc);
113 bool ParseDirectiveSubsectionsViaSymbols(StringRef, SMLoc);
114 bool ParseDirectiveTBSS(StringRef, SMLoc);
115 bool ParseDirectiveZerofill(StringRef, SMLoc);
116
117 // Named Section Directive
ParseSectionDirectiveConst(StringRef,SMLoc)118 bool ParseSectionDirectiveConst(StringRef, SMLoc) {
119 return ParseSectionSwitch("__TEXT", "__const");
120 }
ParseSectionDirectiveStaticConst(StringRef,SMLoc)121 bool ParseSectionDirectiveStaticConst(StringRef, SMLoc) {
122 return ParseSectionSwitch("__TEXT", "__static_const");
123 }
ParseSectionDirectiveCString(StringRef,SMLoc)124 bool ParseSectionDirectiveCString(StringRef, SMLoc) {
125 return ParseSectionSwitch("__TEXT","__cstring",
126 MCSectionMachO::S_CSTRING_LITERALS);
127 }
ParseSectionDirectiveLiteral4(StringRef,SMLoc)128 bool ParseSectionDirectiveLiteral4(StringRef, SMLoc) {
129 return ParseSectionSwitch("__TEXT", "__literal4",
130 MCSectionMachO::S_4BYTE_LITERALS, 4);
131 }
ParseSectionDirectiveLiteral8(StringRef,SMLoc)132 bool ParseSectionDirectiveLiteral8(StringRef, SMLoc) {
133 return ParseSectionSwitch("__TEXT", "__literal8",
134 MCSectionMachO::S_8BYTE_LITERALS, 8);
135 }
ParseSectionDirectiveLiteral16(StringRef,SMLoc)136 bool ParseSectionDirectiveLiteral16(StringRef, SMLoc) {
137 return ParseSectionSwitch("__TEXT","__literal16",
138 MCSectionMachO::S_16BYTE_LITERALS, 16);
139 }
ParseSectionDirectiveConstructor(StringRef,SMLoc)140 bool ParseSectionDirectiveConstructor(StringRef, SMLoc) {
141 return ParseSectionSwitch("__TEXT","__constructor");
142 }
ParseSectionDirectiveDestructor(StringRef,SMLoc)143 bool ParseSectionDirectiveDestructor(StringRef, SMLoc) {
144 return ParseSectionSwitch("__TEXT","__destructor");
145 }
ParseSectionDirectiveFVMLibInit0(StringRef,SMLoc)146 bool ParseSectionDirectiveFVMLibInit0(StringRef, SMLoc) {
147 return ParseSectionSwitch("__TEXT","__fvmlib_init0");
148 }
ParseSectionDirectiveFVMLibInit1(StringRef,SMLoc)149 bool ParseSectionDirectiveFVMLibInit1(StringRef, SMLoc) {
150 return ParseSectionSwitch("__TEXT","__fvmlib_init1");
151 }
ParseSectionDirectiveSymbolStub(StringRef,SMLoc)152 bool ParseSectionDirectiveSymbolStub(StringRef, SMLoc) {
153 return ParseSectionSwitch("__TEXT","__symbol_stub",
154 MCSectionMachO::S_SYMBOL_STUBS |
155 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
156 // FIXME: Different on PPC and ARM.
157 0, 16);
158 }
ParseSectionDirectivePICSymbolStub(StringRef,SMLoc)159 bool ParseSectionDirectivePICSymbolStub(StringRef, SMLoc) {
160 return ParseSectionSwitch("__TEXT","__picsymbol_stub",
161 MCSectionMachO::S_SYMBOL_STUBS |
162 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, 0, 26);
163 }
ParseSectionDirectiveData(StringRef,SMLoc)164 bool ParseSectionDirectiveData(StringRef, SMLoc) {
165 return ParseSectionSwitch("__DATA", "__data");
166 }
ParseSectionDirectiveStaticData(StringRef,SMLoc)167 bool ParseSectionDirectiveStaticData(StringRef, SMLoc) {
168 return ParseSectionSwitch("__DATA", "__static_data");
169 }
ParseSectionDirectiveNonLazySymbolPointers(StringRef,SMLoc)170 bool ParseSectionDirectiveNonLazySymbolPointers(StringRef, SMLoc) {
171 return ParseSectionSwitch("__DATA", "__nl_symbol_ptr",
172 MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS, 4);
173 }
ParseSectionDirectiveLazySymbolPointers(StringRef,SMLoc)174 bool ParseSectionDirectiveLazySymbolPointers(StringRef, SMLoc) {
175 return ParseSectionSwitch("__DATA", "__la_symbol_ptr",
176 MCSectionMachO::S_LAZY_SYMBOL_POINTERS, 4);
177 }
ParseSectionDirectiveDyld(StringRef,SMLoc)178 bool ParseSectionDirectiveDyld(StringRef, SMLoc) {
179 return ParseSectionSwitch("__DATA", "__dyld");
180 }
ParseSectionDirectiveModInitFunc(StringRef,SMLoc)181 bool ParseSectionDirectiveModInitFunc(StringRef, SMLoc) {
182 return ParseSectionSwitch("__DATA", "__mod_init_func",
183 MCSectionMachO::S_MOD_INIT_FUNC_POINTERS, 4);
184 }
ParseSectionDirectiveModTermFunc(StringRef,SMLoc)185 bool ParseSectionDirectiveModTermFunc(StringRef, SMLoc) {
186 return ParseSectionSwitch("__DATA", "__mod_term_func",
187 MCSectionMachO::S_MOD_TERM_FUNC_POINTERS, 4);
188 }
ParseSectionDirectiveConstData(StringRef,SMLoc)189 bool ParseSectionDirectiveConstData(StringRef, SMLoc) {
190 return ParseSectionSwitch("__DATA", "__const");
191 }
ParseSectionDirectiveObjCClass(StringRef,SMLoc)192 bool ParseSectionDirectiveObjCClass(StringRef, SMLoc) {
193 return ParseSectionSwitch("__OBJC", "__class",
194 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
195 }
ParseSectionDirectiveObjCMetaClass(StringRef,SMLoc)196 bool ParseSectionDirectiveObjCMetaClass(StringRef, SMLoc) {
197 return ParseSectionSwitch("__OBJC", "__meta_class",
198 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
199 }
ParseSectionDirectiveObjCCatClsMeth(StringRef,SMLoc)200 bool ParseSectionDirectiveObjCCatClsMeth(StringRef, SMLoc) {
201 return ParseSectionSwitch("__OBJC", "__cat_cls_meth",
202 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
203 }
ParseSectionDirectiveObjCCatInstMeth(StringRef,SMLoc)204 bool ParseSectionDirectiveObjCCatInstMeth(StringRef, SMLoc) {
205 return ParseSectionSwitch("__OBJC", "__cat_inst_meth",
206 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
207 }
ParseSectionDirectiveObjCProtocol(StringRef,SMLoc)208 bool ParseSectionDirectiveObjCProtocol(StringRef, SMLoc) {
209 return ParseSectionSwitch("__OBJC", "__protocol",
210 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
211 }
ParseSectionDirectiveObjCStringObject(StringRef,SMLoc)212 bool ParseSectionDirectiveObjCStringObject(StringRef, SMLoc) {
213 return ParseSectionSwitch("__OBJC", "__string_object",
214 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
215 }
ParseSectionDirectiveObjCClsMeth(StringRef,SMLoc)216 bool ParseSectionDirectiveObjCClsMeth(StringRef, SMLoc) {
217 return ParseSectionSwitch("__OBJC", "__cls_meth",
218 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
219 }
ParseSectionDirectiveObjCInstMeth(StringRef,SMLoc)220 bool ParseSectionDirectiveObjCInstMeth(StringRef, SMLoc) {
221 return ParseSectionSwitch("__OBJC", "__inst_meth",
222 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
223 }
ParseSectionDirectiveObjCClsRefs(StringRef,SMLoc)224 bool ParseSectionDirectiveObjCClsRefs(StringRef, SMLoc) {
225 return ParseSectionSwitch("__OBJC", "__cls_refs",
226 MCSectionMachO::S_ATTR_NO_DEAD_STRIP |
227 MCSectionMachO::S_LITERAL_POINTERS, 4);
228 }
ParseSectionDirectiveObjCMessageRefs(StringRef,SMLoc)229 bool ParseSectionDirectiveObjCMessageRefs(StringRef, SMLoc) {
230 return ParseSectionSwitch("__OBJC", "__message_refs",
231 MCSectionMachO::S_ATTR_NO_DEAD_STRIP |
232 MCSectionMachO::S_LITERAL_POINTERS, 4);
233 }
ParseSectionDirectiveObjCSymbols(StringRef,SMLoc)234 bool ParseSectionDirectiveObjCSymbols(StringRef, SMLoc) {
235 return ParseSectionSwitch("__OBJC", "__symbols",
236 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
237 }
ParseSectionDirectiveObjCCategory(StringRef,SMLoc)238 bool ParseSectionDirectiveObjCCategory(StringRef, SMLoc) {
239 return ParseSectionSwitch("__OBJC", "__category",
240 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
241 }
ParseSectionDirectiveObjCClassVars(StringRef,SMLoc)242 bool ParseSectionDirectiveObjCClassVars(StringRef, SMLoc) {
243 return ParseSectionSwitch("__OBJC", "__class_vars",
244 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
245 }
ParseSectionDirectiveObjCInstanceVars(StringRef,SMLoc)246 bool ParseSectionDirectiveObjCInstanceVars(StringRef, SMLoc) {
247 return ParseSectionSwitch("__OBJC", "__instance_vars",
248 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
249 }
ParseSectionDirectiveObjCModuleInfo(StringRef,SMLoc)250 bool ParseSectionDirectiveObjCModuleInfo(StringRef, SMLoc) {
251 return ParseSectionSwitch("__OBJC", "__module_info",
252 MCSectionMachO::S_ATTR_NO_DEAD_STRIP);
253 }
ParseSectionDirectiveObjCClassNames(StringRef,SMLoc)254 bool ParseSectionDirectiveObjCClassNames(StringRef, SMLoc) {
255 return ParseSectionSwitch("__TEXT", "__cstring",
256 MCSectionMachO::S_CSTRING_LITERALS);
257 }
ParseSectionDirectiveObjCMethVarTypes(StringRef,SMLoc)258 bool ParseSectionDirectiveObjCMethVarTypes(StringRef, SMLoc) {
259 return ParseSectionSwitch("__TEXT", "__cstring",
260 MCSectionMachO::S_CSTRING_LITERALS);
261 }
ParseSectionDirectiveObjCMethVarNames(StringRef,SMLoc)262 bool ParseSectionDirectiveObjCMethVarNames(StringRef, SMLoc) {
263 return ParseSectionSwitch("__TEXT", "__cstring",
264 MCSectionMachO::S_CSTRING_LITERALS);
265 }
ParseSectionDirectiveObjCSelectorStrs(StringRef,SMLoc)266 bool ParseSectionDirectiveObjCSelectorStrs(StringRef, SMLoc) {
267 return ParseSectionSwitch("__OBJC", "__selector_strs",
268 MCSectionMachO::S_CSTRING_LITERALS);
269 }
ParseSectionDirectiveTData(StringRef,SMLoc)270 bool ParseSectionDirectiveTData(StringRef, SMLoc) {
271 return ParseSectionSwitch("__DATA", "__thread_data",
272 MCSectionMachO::S_THREAD_LOCAL_REGULAR);
273 }
ParseSectionDirectiveText(StringRef,SMLoc)274 bool ParseSectionDirectiveText(StringRef, SMLoc) {
275 return ParseSectionSwitch("__TEXT", "__text",
276 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS);
277 }
ParseSectionDirectiveTLV(StringRef,SMLoc)278 bool ParseSectionDirectiveTLV(StringRef, SMLoc) {
279 return ParseSectionSwitch("__DATA", "__thread_vars",
280 MCSectionMachO::S_THREAD_LOCAL_VARIABLES);
281 }
ParseSectionDirectiveIdent(StringRef,SMLoc)282 bool ParseSectionDirectiveIdent(StringRef, SMLoc) {
283 // Darwin silently ignores the .ident directive.
284 getParser().EatToEndOfStatement();
285 return false;
286 }
ParseSectionDirectiveThreadInitFunc(StringRef,SMLoc)287 bool ParseSectionDirectiveThreadInitFunc(StringRef, SMLoc) {
288 return ParseSectionSwitch("__DATA", "__thread_init",
289 MCSectionMachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS);
290 }
291
292 };
293
294 }
295
ParseSectionSwitch(const char * Segment,const char * Section,unsigned TAA,unsigned Align,unsigned StubSize)296 bool DarwinAsmParser::ParseSectionSwitch(const char *Segment,
297 const char *Section,
298 unsigned TAA, unsigned Align,
299 unsigned StubSize) {
300 if (getLexer().isNot(AsmToken::EndOfStatement))
301 return TokError("unexpected token in section switching directive");
302 Lex();
303
304 // FIXME: Arch specific.
305 bool isText = StringRef(Segment) == "__TEXT"; // FIXME: Hack.
306 getStreamer().SwitchSection(getContext().getMachOSection(
307 Segment, Section, TAA, StubSize,
308 isText ? SectionKind::getText()
309 : SectionKind::getDataRel()));
310
311 // Set the implicit alignment, if any.
312 //
313 // FIXME: This isn't really what 'as' does; I think it just uses the implicit
314 // alignment on the section (e.g., if one manually inserts bytes into the
315 // section, then just issuing the section switch directive will not realign
316 // the section. However, this is arguably more reasonable behavior, and there
317 // is no good reason for someone to intentionally emit incorrectly sized
318 // values into the implicitly aligned sections.
319 if (Align)
320 getStreamer().EmitValueToAlignment(Align, 0, 1, 0);
321
322 return false;
323 }
324
325 /// ParseDirectiveDesc
326 /// ::= .desc identifier , expression
ParseDirectiveDesc(StringRef,SMLoc)327 bool DarwinAsmParser::ParseDirectiveDesc(StringRef, SMLoc) {
328 StringRef Name;
329 if (getParser().ParseIdentifier(Name))
330 return TokError("expected identifier in directive");
331
332 // Handle the identifier as the key symbol.
333 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
334
335 if (getLexer().isNot(AsmToken::Comma))
336 return TokError("unexpected token in '.desc' directive");
337 Lex();
338
339 int64_t DescValue;
340 if (getParser().ParseAbsoluteExpression(DescValue))
341 return true;
342
343 if (getLexer().isNot(AsmToken::EndOfStatement))
344 return TokError("unexpected token in '.desc' directive");
345
346 Lex();
347
348 // Set the n_desc field of this Symbol to this DescValue
349 getStreamer().EmitSymbolDesc(Sym, DescValue);
350
351 return false;
352 }
353
354 /// ParseDirectiveDumpOrLoad
355 /// ::= ( .dump | .load ) "filename"
ParseDirectiveDumpOrLoad(StringRef Directive,SMLoc IDLoc)356 bool DarwinAsmParser::ParseDirectiveDumpOrLoad(StringRef Directive,
357 SMLoc IDLoc) {
358 bool IsDump = Directive == ".dump";
359 if (getLexer().isNot(AsmToken::String))
360 return TokError("expected string in '.dump' or '.load' directive");
361
362 Lex();
363
364 if (getLexer().isNot(AsmToken::EndOfStatement))
365 return TokError("unexpected token in '.dump' or '.load' directive");
366
367 Lex();
368
369 // FIXME: If/when .dump and .load are implemented they will be done in the
370 // the assembly parser and not have any need for an MCStreamer API.
371 if (IsDump)
372 return Warning(IDLoc, "ignoring directive .dump for now");
373 else
374 return Warning(IDLoc, "ignoring directive .load for now");
375 }
376
377 /// ParseDirectiveLsym
378 /// ::= .lsym identifier , expression
ParseDirectiveLsym(StringRef,SMLoc)379 bool DarwinAsmParser::ParseDirectiveLsym(StringRef, SMLoc) {
380 StringRef Name;
381 if (getParser().ParseIdentifier(Name))
382 return TokError("expected identifier in directive");
383
384 // Handle the identifier as the key symbol.
385 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
386
387 if (getLexer().isNot(AsmToken::Comma))
388 return TokError("unexpected token in '.lsym' directive");
389 Lex();
390
391 const MCExpr *Value;
392 if (getParser().ParseExpression(Value))
393 return true;
394
395 if (getLexer().isNot(AsmToken::EndOfStatement))
396 return TokError("unexpected token in '.lsym' directive");
397
398 Lex();
399
400 // We don't currently support this directive.
401 //
402 // FIXME: Diagnostic location!
403 (void) Sym;
404 return TokError("directive '.lsym' is unsupported");
405 }
406
407 /// ParseDirectiveSection:
408 /// ::= .section identifier (',' identifier)*
ParseDirectiveSection(StringRef,SMLoc)409 bool DarwinAsmParser::ParseDirectiveSection(StringRef, SMLoc) {
410 SMLoc Loc = getLexer().getLoc();
411
412 StringRef SectionName;
413 if (getParser().ParseIdentifier(SectionName))
414 return Error(Loc, "expected identifier after '.section' directive");
415
416 // Verify there is a following comma.
417 if (!getLexer().is(AsmToken::Comma))
418 return TokError("unexpected token in '.section' directive");
419
420 std::string SectionSpec = SectionName;
421 SectionSpec += ",";
422
423 // Add all the tokens until the end of the line, ParseSectionSpecifier will
424 // handle this.
425 StringRef EOL = getLexer().LexUntilEndOfStatement();
426 SectionSpec.append(EOL.begin(), EOL.end());
427
428 Lex();
429 if (getLexer().isNot(AsmToken::EndOfStatement))
430 return TokError("unexpected token in '.section' directive");
431 Lex();
432
433
434 StringRef Segment, Section;
435 unsigned StubSize;
436 unsigned TAA;
437 bool TAAParsed;
438 std::string ErrorStr =
439 MCSectionMachO::ParseSectionSpecifier(SectionSpec, Segment, Section,
440 TAA, TAAParsed, StubSize);
441
442 if (!ErrorStr.empty())
443 return Error(Loc, ErrorStr.c_str());
444
445 // FIXME: Arch specific.
446 bool isText = Segment == "__TEXT"; // FIXME: Hack.
447 getStreamer().SwitchSection(getContext().getMachOSection(
448 Segment, Section, TAA, StubSize,
449 isText ? SectionKind::getText()
450 : SectionKind::getDataRel()));
451 return false;
452 }
453
454 /// ParseDirectiveSecureLogUnique
455 /// ::= .secure_log_unique ... message ...
ParseDirectiveSecureLogUnique(StringRef,SMLoc IDLoc)456 bool DarwinAsmParser::ParseDirectiveSecureLogUnique(StringRef, SMLoc IDLoc) {
457 StringRef LogMessage = getParser().ParseStringToEndOfStatement();
458 if (getLexer().isNot(AsmToken::EndOfStatement))
459 return TokError("unexpected token in '.secure_log_unique' directive");
460
461 if (getContext().getSecureLogUsed() != false)
462 return Error(IDLoc, ".secure_log_unique specified multiple times");
463
464 // Get the secure log path.
465 const char *SecureLogFile = getContext().getSecureLogFile();
466 if (SecureLogFile == NULL)
467 return Error(IDLoc, ".secure_log_unique used but AS_SECURE_LOG_FILE "
468 "environment variable unset.");
469
470 // Open the secure log file if we haven't already.
471 raw_ostream *OS = getContext().getSecureLog();
472 if (OS == NULL) {
473 std::string Err;
474 OS = new raw_fd_ostream(SecureLogFile, Err, raw_fd_ostream::F_Append);
475 if (!Err.empty()) {
476 delete OS;
477 return Error(IDLoc, Twine("can't open secure log file: ") +
478 SecureLogFile + " (" + Err + ")");
479 }
480 getContext().setSecureLog(OS);
481 }
482
483 // Write the message.
484 int CurBuf = getSourceManager().FindBufferContainingLoc(IDLoc);
485 *OS << getSourceManager().getBufferInfo(CurBuf).Buffer->getBufferIdentifier()
486 << ":" << getSourceManager().FindLineNumber(IDLoc, CurBuf) << ":"
487 << LogMessage + "\n";
488
489 getContext().setSecureLogUsed(true);
490
491 return false;
492 }
493
494 /// ParseDirectiveSecureLogReset
495 /// ::= .secure_log_reset
ParseDirectiveSecureLogReset(StringRef,SMLoc IDLoc)496 bool DarwinAsmParser::ParseDirectiveSecureLogReset(StringRef, SMLoc IDLoc) {
497 if (getLexer().isNot(AsmToken::EndOfStatement))
498 return TokError("unexpected token in '.secure_log_reset' directive");
499
500 Lex();
501
502 getContext().setSecureLogUsed(false);
503
504 return false;
505 }
506
507 /// ParseDirectiveSubsectionsViaSymbols
508 /// ::= .subsections_via_symbols
ParseDirectiveSubsectionsViaSymbols(StringRef,SMLoc)509 bool DarwinAsmParser::ParseDirectiveSubsectionsViaSymbols(StringRef, SMLoc) {
510 if (getLexer().isNot(AsmToken::EndOfStatement))
511 return TokError("unexpected token in '.subsections_via_symbols' directive");
512
513 Lex();
514
515 getStreamer().EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
516
517 return false;
518 }
519
520 /// ParseDirectiveTBSS
521 /// ::= .tbss identifier, size, align
ParseDirectiveTBSS(StringRef,SMLoc)522 bool DarwinAsmParser::ParseDirectiveTBSS(StringRef, SMLoc) {
523 SMLoc IDLoc = getLexer().getLoc();
524 StringRef Name;
525 if (getParser().ParseIdentifier(Name))
526 return TokError("expected identifier in directive");
527
528 // Handle the identifier as the key symbol.
529 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
530
531 if (getLexer().isNot(AsmToken::Comma))
532 return TokError("unexpected token in directive");
533 Lex();
534
535 int64_t Size;
536 SMLoc SizeLoc = getLexer().getLoc();
537 if (getParser().ParseAbsoluteExpression(Size))
538 return true;
539
540 int64_t Pow2Alignment = 0;
541 SMLoc Pow2AlignmentLoc;
542 if (getLexer().is(AsmToken::Comma)) {
543 Lex();
544 Pow2AlignmentLoc = getLexer().getLoc();
545 if (getParser().ParseAbsoluteExpression(Pow2Alignment))
546 return true;
547 }
548
549 if (getLexer().isNot(AsmToken::EndOfStatement))
550 return TokError("unexpected token in '.tbss' directive");
551
552 Lex();
553
554 if (Size < 0)
555 return Error(SizeLoc, "invalid '.tbss' directive size, can't be less than"
556 "zero");
557
558 // FIXME: Diagnose overflow.
559 if (Pow2Alignment < 0)
560 return Error(Pow2AlignmentLoc, "invalid '.tbss' alignment, can't be less"
561 "than zero");
562
563 if (!Sym->isUndefined())
564 return Error(IDLoc, "invalid symbol redefinition");
565
566 getStreamer().EmitTBSSSymbol(getContext().getMachOSection(
567 "__DATA", "__thread_bss",
568 MCSectionMachO::S_THREAD_LOCAL_ZEROFILL,
569 0, SectionKind::getThreadBSS()),
570 Sym, Size, 1 << Pow2Alignment);
571
572 return false;
573 }
574
575 /// ParseDirectiveZerofill
576 /// ::= .zerofill segname , sectname [, identifier , size_expression [
577 /// , align_expression ]]
ParseDirectiveZerofill(StringRef,SMLoc)578 bool DarwinAsmParser::ParseDirectiveZerofill(StringRef, SMLoc) {
579 StringRef Segment;
580 if (getParser().ParseIdentifier(Segment))
581 return TokError("expected segment name after '.zerofill' directive");
582
583 if (getLexer().isNot(AsmToken::Comma))
584 return TokError("unexpected token in directive");
585 Lex();
586
587 StringRef Section;
588 if (getParser().ParseIdentifier(Section))
589 return TokError("expected section name after comma in '.zerofill' "
590 "directive");
591
592 // If this is the end of the line all that was wanted was to create the
593 // the section but with no symbol.
594 if (getLexer().is(AsmToken::EndOfStatement)) {
595 // Create the zerofill section but no symbol
596 getStreamer().EmitZerofill(getContext().getMachOSection(
597 Segment, Section, MCSectionMachO::S_ZEROFILL,
598 0, SectionKind::getBSS()));
599 return false;
600 }
601
602 if (getLexer().isNot(AsmToken::Comma))
603 return TokError("unexpected token in directive");
604 Lex();
605
606 SMLoc IDLoc = getLexer().getLoc();
607 StringRef IDStr;
608 if (getParser().ParseIdentifier(IDStr))
609 return TokError("expected identifier in directive");
610
611 // handle the identifier as the key symbol.
612 MCSymbol *Sym = getContext().GetOrCreateSymbol(IDStr);
613
614 if (getLexer().isNot(AsmToken::Comma))
615 return TokError("unexpected token in directive");
616 Lex();
617
618 int64_t Size;
619 SMLoc SizeLoc = getLexer().getLoc();
620 if (getParser().ParseAbsoluteExpression(Size))
621 return true;
622
623 int64_t Pow2Alignment = 0;
624 SMLoc Pow2AlignmentLoc;
625 if (getLexer().is(AsmToken::Comma)) {
626 Lex();
627 Pow2AlignmentLoc = getLexer().getLoc();
628 if (getParser().ParseAbsoluteExpression(Pow2Alignment))
629 return true;
630 }
631
632 if (getLexer().isNot(AsmToken::EndOfStatement))
633 return TokError("unexpected token in '.zerofill' directive");
634
635 Lex();
636
637 if (Size < 0)
638 return Error(SizeLoc, "invalid '.zerofill' directive size, can't be less "
639 "than zero");
640
641 // NOTE: The alignment in the directive is a power of 2 value, the assembler
642 // may internally end up wanting an alignment in bytes.
643 // FIXME: Diagnose overflow.
644 if (Pow2Alignment < 0)
645 return Error(Pow2AlignmentLoc, "invalid '.zerofill' directive alignment, "
646 "can't be less than zero");
647
648 if (!Sym->isUndefined())
649 return Error(IDLoc, "invalid symbol redefinition");
650
651 // Create the zerofill Symbol with Size and Pow2Alignment
652 //
653 // FIXME: Arch specific.
654 getStreamer().EmitZerofill(getContext().getMachOSection(
655 Segment, Section, MCSectionMachO::S_ZEROFILL,
656 0, SectionKind::getBSS()),
657 Sym, Size, 1 << Pow2Alignment);
658
659 return false;
660 }
661
662 namespace llvm {
663
createDarwinAsmParser()664 MCAsmParserExtension *createDarwinAsmParser() {
665 return new DarwinAsmParser;
666 }
667
668 }
669