1 //===--- ParseTemplate.cpp - Template Parsing -----------------------------===//
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 // This file implements parsing of C++ templates.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "clang/Parse/Parser.h"
15 #include "clang/Parse/ParseDiagnostic.h"
16 #include "clang/Sema/DeclSpec.h"
17 #include "clang/Sema/ParsedTemplate.h"
18 #include "clang/Sema/Scope.h"
19 #include "RAIIObjectsForParser.h"
20 #include "clang/AST/DeclTemplate.h"
21 #include "clang/AST/ASTConsumer.h"
22 using namespace clang;
23
24 /// \brief Parse a template declaration, explicit instantiation, or
25 /// explicit specialization.
26 Decl *
ParseDeclarationStartingWithTemplate(unsigned Context,SourceLocation & DeclEnd,AccessSpecifier AS,AttributeList * AccessAttrs)27 Parser::ParseDeclarationStartingWithTemplate(unsigned Context,
28 SourceLocation &DeclEnd,
29 AccessSpecifier AS,
30 AttributeList *AccessAttrs) {
31 ObjCDeclContextSwitch ObjCDC(*this);
32
33 if (Tok.is(tok::kw_template) && NextToken().isNot(tok::less)) {
34 return ParseExplicitInstantiation(Context,
35 SourceLocation(), ConsumeToken(),
36 DeclEnd, AS);
37 }
38 return ParseTemplateDeclarationOrSpecialization(Context, DeclEnd, AS,
39 AccessAttrs);
40 }
41
42 /// \brief RAII class that manages the template parameter depth.
43 namespace {
44 class TemplateParameterDepthCounter {
45 unsigned &Depth;
46 unsigned AddedLevels;
47
48 public:
TemplateParameterDepthCounter(unsigned & Depth)49 explicit TemplateParameterDepthCounter(unsigned &Depth)
50 : Depth(Depth), AddedLevels(0) { }
51
~TemplateParameterDepthCounter()52 ~TemplateParameterDepthCounter() {
53 Depth -= AddedLevels;
54 }
55
operator ++()56 void operator++() {
57 ++Depth;
58 ++AddedLevels;
59 }
60
operator unsigned() const61 operator unsigned() const { return Depth; }
62 };
63 }
64
65 /// \brief Parse a template declaration or an explicit specialization.
66 ///
67 /// Template declarations include one or more template parameter lists
68 /// and either the function or class template declaration. Explicit
69 /// specializations contain one or more 'template < >' prefixes
70 /// followed by a (possibly templated) declaration. Since the
71 /// syntactic form of both features is nearly identical, we parse all
72 /// of the template headers together and let semantic analysis sort
73 /// the declarations from the explicit specializations.
74 ///
75 /// template-declaration: [C++ temp]
76 /// 'export'[opt] 'template' '<' template-parameter-list '>' declaration
77 ///
78 /// explicit-specialization: [ C++ temp.expl.spec]
79 /// 'template' '<' '>' declaration
80 Decl *
ParseTemplateDeclarationOrSpecialization(unsigned Context,SourceLocation & DeclEnd,AccessSpecifier AS,AttributeList * AccessAttrs)81 Parser::ParseTemplateDeclarationOrSpecialization(unsigned Context,
82 SourceLocation &DeclEnd,
83 AccessSpecifier AS,
84 AttributeList *AccessAttrs) {
85 assert((Tok.is(tok::kw_export) || Tok.is(tok::kw_template)) &&
86 "Token does not start a template declaration.");
87
88 // Enter template-parameter scope.
89 ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
90
91 // Tell the action that names should be checked in the context of
92 // the declaration to come.
93 ParsingDeclRAIIObject ParsingTemplateParams(*this);
94
95 // Parse multiple levels of template headers within this template
96 // parameter scope, e.g.,
97 //
98 // template<typename T>
99 // template<typename U>
100 // class A<T>::B { ... };
101 //
102 // We parse multiple levels non-recursively so that we can build a
103 // single data structure containing all of the template parameter
104 // lists to easily differentiate between the case above and:
105 //
106 // template<typename T>
107 // class A {
108 // template<typename U> class B;
109 // };
110 //
111 // In the first case, the action for declaring A<T>::B receives
112 // both template parameter lists. In the second case, the action for
113 // defining A<T>::B receives just the inner template parameter list
114 // (and retrieves the outer template parameter list from its
115 // context).
116 bool isSpecialization = true;
117 bool LastParamListWasEmpty = false;
118 TemplateParameterLists ParamLists;
119 TemplateParameterDepthCounter Depth(TemplateParameterDepth);
120 do {
121 // Consume the 'export', if any.
122 SourceLocation ExportLoc;
123 if (Tok.is(tok::kw_export)) {
124 ExportLoc = ConsumeToken();
125 }
126
127 // Consume the 'template', which should be here.
128 SourceLocation TemplateLoc;
129 if (Tok.is(tok::kw_template)) {
130 TemplateLoc = ConsumeToken();
131 } else {
132 Diag(Tok.getLocation(), diag::err_expected_template);
133 return 0;
134 }
135
136 // Parse the '<' template-parameter-list '>'
137 SourceLocation LAngleLoc, RAngleLoc;
138 SmallVector<Decl*, 4> TemplateParams;
139 if (ParseTemplateParameters(Depth, TemplateParams, LAngleLoc,
140 RAngleLoc)) {
141 // Skip until the semi-colon or a }.
142 SkipUntil(tok::r_brace, true, true);
143 if (Tok.is(tok::semi))
144 ConsumeToken();
145 return 0;
146 }
147
148 ParamLists.push_back(
149 Actions.ActOnTemplateParameterList(Depth, ExportLoc,
150 TemplateLoc, LAngleLoc,
151 TemplateParams.data(),
152 TemplateParams.size(), RAngleLoc));
153
154 if (!TemplateParams.empty()) {
155 isSpecialization = false;
156 ++Depth;
157 } else {
158 LastParamListWasEmpty = true;
159 }
160 } while (Tok.is(tok::kw_export) || Tok.is(tok::kw_template));
161
162 // Parse the actual template declaration.
163 return ParseSingleDeclarationAfterTemplate(Context,
164 ParsedTemplateInfo(&ParamLists,
165 isSpecialization,
166 LastParamListWasEmpty),
167 ParsingTemplateParams,
168 DeclEnd, AS, AccessAttrs);
169 }
170
171 /// \brief Parse a single declaration that declares a template,
172 /// template specialization, or explicit instantiation of a template.
173 ///
174 /// \param TemplateParams if non-NULL, the template parameter lists
175 /// that preceded this declaration. In this case, the declaration is a
176 /// template declaration, out-of-line definition of a template, or an
177 /// explicit template specialization. When NULL, the declaration is an
178 /// explicit template instantiation.
179 ///
180 /// \param TemplateLoc when TemplateParams is NULL, the location of
181 /// the 'template' keyword that indicates that we have an explicit
182 /// template instantiation.
183 ///
184 /// \param DeclEnd will receive the source location of the last token
185 /// within this declaration.
186 ///
187 /// \param AS the access specifier associated with this
188 /// declaration. Will be AS_none for namespace-scope declarations.
189 ///
190 /// \returns the new declaration.
191 Decl *
ParseSingleDeclarationAfterTemplate(unsigned Context,const ParsedTemplateInfo & TemplateInfo,ParsingDeclRAIIObject & DiagsFromTParams,SourceLocation & DeclEnd,AccessSpecifier AS,AttributeList * AccessAttrs)192 Parser::ParseSingleDeclarationAfterTemplate(
193 unsigned Context,
194 const ParsedTemplateInfo &TemplateInfo,
195 ParsingDeclRAIIObject &DiagsFromTParams,
196 SourceLocation &DeclEnd,
197 AccessSpecifier AS,
198 AttributeList *AccessAttrs) {
199 assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
200 "Template information required");
201
202 if (Context == Declarator::MemberContext) {
203 // We are parsing a member template.
204 ParseCXXClassMemberDeclaration(AS, AccessAttrs, TemplateInfo,
205 &DiagsFromTParams);
206 return 0;
207 }
208
209 ParsedAttributesWithRange prefixAttrs(AttrFactory);
210 MaybeParseCXX0XAttributes(prefixAttrs);
211
212 if (Tok.is(tok::kw_using))
213 return ParseUsingDirectiveOrDeclaration(Context, TemplateInfo, DeclEnd,
214 prefixAttrs);
215
216 // Parse the declaration specifiers, stealing the accumulated
217 // diagnostics from the template parameters.
218 ParsingDeclSpec DS(*this, &DiagsFromTParams);
219
220 DS.takeAttributesFrom(prefixAttrs);
221
222 ParseDeclarationSpecifiers(DS, TemplateInfo, AS,
223 getDeclSpecContextFromDeclaratorContext(Context));
224
225 if (Tok.is(tok::semi)) {
226 DeclEnd = ConsumeToken();
227 Decl *Decl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS);
228 DS.complete(Decl);
229 return Decl;
230 }
231
232 // Parse the declarator.
233 ParsingDeclarator DeclaratorInfo(*this, DS, (Declarator::TheContext)Context);
234 ParseDeclarator(DeclaratorInfo);
235 // Error parsing the declarator?
236 if (!DeclaratorInfo.hasName()) {
237 // If so, skip until the semi-colon or a }.
238 SkipUntil(tok::r_brace, true, true);
239 if (Tok.is(tok::semi))
240 ConsumeToken();
241 return 0;
242 }
243
244 LateParsedAttrList LateParsedAttrs;
245 if (DeclaratorInfo.isFunctionDeclarator())
246 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
247
248 // If we have a declaration or declarator list, handle it.
249 if (isDeclarationAfterDeclarator()) {
250 // Parse this declaration.
251 Decl *ThisDecl = ParseDeclarationAfterDeclarator(DeclaratorInfo,
252 TemplateInfo);
253
254 if (Tok.is(tok::comma)) {
255 Diag(Tok, diag::err_multiple_template_declarators)
256 << (int)TemplateInfo.Kind;
257 SkipUntil(tok::semi, true, false);
258 return ThisDecl;
259 }
260
261 // Eat the semi colon after the declaration.
262 ExpectAndConsume(tok::semi, diag::err_expected_semi_declaration);
263 if (LateParsedAttrs.size() > 0)
264 ParseLexedAttributeList(LateParsedAttrs, ThisDecl, true, false);
265 DeclaratorInfo.complete(ThisDecl);
266 return ThisDecl;
267 }
268
269 if (DeclaratorInfo.isFunctionDeclarator() &&
270 isStartOfFunctionDefinition(DeclaratorInfo)) {
271 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
272 // Recover by ignoring the 'typedef'. This was probably supposed to be
273 // the 'typename' keyword, which we should have already suggested adding
274 // if it's appropriate.
275 Diag(DS.getStorageClassSpecLoc(), diag::err_function_declared_typedef)
276 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
277 DS.ClearStorageClassSpecs();
278 }
279 return ParseFunctionDefinition(DeclaratorInfo, TemplateInfo,
280 &LateParsedAttrs);
281 }
282
283 if (DeclaratorInfo.isFunctionDeclarator())
284 Diag(Tok, diag::err_expected_fn_body);
285 else
286 Diag(Tok, diag::err_invalid_token_after_toplevel_declarator);
287 SkipUntil(tok::semi);
288 return 0;
289 }
290
291 /// ParseTemplateParameters - Parses a template-parameter-list enclosed in
292 /// angle brackets. Depth is the depth of this template-parameter-list, which
293 /// is the number of template headers directly enclosing this template header.
294 /// TemplateParams is the current list of template parameters we're building.
295 /// The template parameter we parse will be added to this list. LAngleLoc and
296 /// RAngleLoc will receive the positions of the '<' and '>', respectively,
297 /// that enclose this template parameter list.
298 ///
299 /// \returns true if an error occurred, false otherwise.
ParseTemplateParameters(unsigned Depth,SmallVectorImpl<Decl * > & TemplateParams,SourceLocation & LAngleLoc,SourceLocation & RAngleLoc)300 bool Parser::ParseTemplateParameters(unsigned Depth,
301 SmallVectorImpl<Decl*> &TemplateParams,
302 SourceLocation &LAngleLoc,
303 SourceLocation &RAngleLoc) {
304 // Get the template parameter list.
305 if (!Tok.is(tok::less)) {
306 Diag(Tok.getLocation(), diag::err_expected_less_after) << "template";
307 return true;
308 }
309 LAngleLoc = ConsumeToken();
310
311 // Try to parse the template parameter list.
312 bool Failed = false;
313 if (!Tok.is(tok::greater) && !Tok.is(tok::greatergreater))
314 Failed = ParseTemplateParameterList(Depth, TemplateParams);
315
316 if (Tok.is(tok::greatergreater)) {
317 Tok.setKind(tok::greater);
318 RAngleLoc = Tok.getLocation();
319 Tok.setLocation(Tok.getLocation().getLocWithOffset(1));
320 } else if (Tok.is(tok::greater))
321 RAngleLoc = ConsumeToken();
322 else if (Failed) {
323 Diag(Tok.getLocation(), diag::err_expected_greater);
324 return true;
325 }
326 return false;
327 }
328
329 /// ParseTemplateParameterList - Parse a template parameter list. If
330 /// the parsing fails badly (i.e., closing bracket was left out), this
331 /// will try to put the token stream in a reasonable position (closing
332 /// a statement, etc.) and return false.
333 ///
334 /// template-parameter-list: [C++ temp]
335 /// template-parameter
336 /// template-parameter-list ',' template-parameter
337 bool
ParseTemplateParameterList(unsigned Depth,SmallVectorImpl<Decl * > & TemplateParams)338 Parser::ParseTemplateParameterList(unsigned Depth,
339 SmallVectorImpl<Decl*> &TemplateParams) {
340 while (1) {
341 if (Decl *TmpParam
342 = ParseTemplateParameter(Depth, TemplateParams.size())) {
343 TemplateParams.push_back(TmpParam);
344 } else {
345 // If we failed to parse a template parameter, skip until we find
346 // a comma or closing brace.
347 SkipUntil(tok::comma, tok::greater, tok::greatergreater, true, true);
348 }
349
350 // Did we find a comma or the end of the template parmeter list?
351 if (Tok.is(tok::comma)) {
352 ConsumeToken();
353 } else if (Tok.is(tok::greater) || Tok.is(tok::greatergreater)) {
354 // Don't consume this... that's done by template parser.
355 break;
356 } else {
357 // Somebody probably forgot to close the template. Skip ahead and
358 // try to get out of the expression. This error is currently
359 // subsumed by whatever goes on in ParseTemplateParameter.
360 Diag(Tok.getLocation(), diag::err_expected_comma_greater);
361 SkipUntil(tok::comma, tok::greater, tok::greatergreater, true, true);
362 return false;
363 }
364 }
365 return true;
366 }
367
368 /// \brief Determine whether the parser is at the start of a template
369 /// type parameter.
isStartOfTemplateTypeParameter()370 bool Parser::isStartOfTemplateTypeParameter() {
371 if (Tok.is(tok::kw_class)) {
372 // "class" may be the start of an elaborated-type-specifier or a
373 // type-parameter. Per C++ [temp.param]p3, we prefer the type-parameter.
374 switch (NextToken().getKind()) {
375 case tok::equal:
376 case tok::comma:
377 case tok::greater:
378 case tok::greatergreater:
379 case tok::ellipsis:
380 return true;
381
382 case tok::identifier:
383 // This may be either a type-parameter or an elaborated-type-specifier.
384 // We have to look further.
385 break;
386
387 default:
388 return false;
389 }
390
391 switch (GetLookAheadToken(2).getKind()) {
392 case tok::equal:
393 case tok::comma:
394 case tok::greater:
395 case tok::greatergreater:
396 return true;
397
398 default:
399 return false;
400 }
401 }
402
403 if (Tok.isNot(tok::kw_typename))
404 return false;
405
406 // C++ [temp.param]p2:
407 // There is no semantic difference between class and typename in a
408 // template-parameter. typename followed by an unqualified-id
409 // names a template type parameter. typename followed by a
410 // qualified-id denotes the type in a non-type
411 // parameter-declaration.
412 Token Next = NextToken();
413
414 // If we have an identifier, skip over it.
415 if (Next.getKind() == tok::identifier)
416 Next = GetLookAheadToken(2);
417
418 switch (Next.getKind()) {
419 case tok::equal:
420 case tok::comma:
421 case tok::greater:
422 case tok::greatergreater:
423 case tok::ellipsis:
424 return true;
425
426 default:
427 return false;
428 }
429 }
430
431 /// ParseTemplateParameter - Parse a template-parameter (C++ [temp.param]).
432 ///
433 /// template-parameter: [C++ temp.param]
434 /// type-parameter
435 /// parameter-declaration
436 ///
437 /// type-parameter: (see below)
438 /// 'class' ...[opt] identifier[opt]
439 /// 'class' identifier[opt] '=' type-id
440 /// 'typename' ...[opt] identifier[opt]
441 /// 'typename' identifier[opt] '=' type-id
442 /// 'template' '<' template-parameter-list '>'
443 /// 'class' ...[opt] identifier[opt]
444 /// 'template' '<' template-parameter-list '>' 'class' identifier[opt]
445 /// = id-expression
ParseTemplateParameter(unsigned Depth,unsigned Position)446 Decl *Parser::ParseTemplateParameter(unsigned Depth, unsigned Position) {
447 if (isStartOfTemplateTypeParameter())
448 return ParseTypeParameter(Depth, Position);
449
450 if (Tok.is(tok::kw_template))
451 return ParseTemplateTemplateParameter(Depth, Position);
452
453 // If it's none of the above, then it must be a parameter declaration.
454 // NOTE: This will pick up errors in the closure of the template parameter
455 // list (e.g., template < ; Check here to implement >> style closures.
456 return ParseNonTypeTemplateParameter(Depth, Position);
457 }
458
459 /// ParseTypeParameter - Parse a template type parameter (C++ [temp.param]).
460 /// Other kinds of template parameters are parsed in
461 /// ParseTemplateTemplateParameter and ParseNonTypeTemplateParameter.
462 ///
463 /// type-parameter: [C++ temp.param]
464 /// 'class' ...[opt][C++0x] identifier[opt]
465 /// 'class' identifier[opt] '=' type-id
466 /// 'typename' ...[opt][C++0x] identifier[opt]
467 /// 'typename' identifier[opt] '=' type-id
ParseTypeParameter(unsigned Depth,unsigned Position)468 Decl *Parser::ParseTypeParameter(unsigned Depth, unsigned Position) {
469 assert((Tok.is(tok::kw_class) || Tok.is(tok::kw_typename)) &&
470 "A type-parameter starts with 'class' or 'typename'");
471
472 // Consume the 'class' or 'typename' keyword.
473 bool TypenameKeyword = Tok.is(tok::kw_typename);
474 SourceLocation KeyLoc = ConsumeToken();
475
476 // Grab the ellipsis (if given).
477 bool Ellipsis = false;
478 SourceLocation EllipsisLoc;
479 if (Tok.is(tok::ellipsis)) {
480 Ellipsis = true;
481 EllipsisLoc = ConsumeToken();
482
483 Diag(EllipsisLoc,
484 getLangOpts().CPlusPlus0x
485 ? diag::warn_cxx98_compat_variadic_templates
486 : diag::ext_variadic_templates);
487 }
488
489 // Grab the template parameter name (if given)
490 SourceLocation NameLoc;
491 IdentifierInfo* ParamName = 0;
492 if (Tok.is(tok::identifier)) {
493 ParamName = Tok.getIdentifierInfo();
494 NameLoc = ConsumeToken();
495 } else if (Tok.is(tok::equal) || Tok.is(tok::comma) ||
496 Tok.is(tok::greater) || Tok.is(tok::greatergreater)) {
497 // Unnamed template parameter. Don't have to do anything here, just
498 // don't consume this token.
499 } else {
500 Diag(Tok.getLocation(), diag::err_expected_ident);
501 return 0;
502 }
503
504 // Grab a default argument (if available).
505 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
506 // we introduce the type parameter into the local scope.
507 SourceLocation EqualLoc;
508 ParsedType DefaultArg;
509 if (Tok.is(tok::equal)) {
510 EqualLoc = ConsumeToken();
511 DefaultArg = ParseTypeName(/*Range=*/0,
512 Declarator::TemplateTypeArgContext).get();
513 }
514
515 return Actions.ActOnTypeParameter(getCurScope(), TypenameKeyword, Ellipsis,
516 EllipsisLoc, KeyLoc, ParamName, NameLoc,
517 Depth, Position, EqualLoc, DefaultArg);
518 }
519
520 /// ParseTemplateTemplateParameter - Handle the parsing of template
521 /// template parameters.
522 ///
523 /// type-parameter: [C++ temp.param]
524 /// 'template' '<' template-parameter-list '>' 'class'
525 /// ...[opt] identifier[opt]
526 /// 'template' '<' template-parameter-list '>' 'class' identifier[opt]
527 /// = id-expression
528 Decl *
ParseTemplateTemplateParameter(unsigned Depth,unsigned Position)529 Parser::ParseTemplateTemplateParameter(unsigned Depth, unsigned Position) {
530 assert(Tok.is(tok::kw_template) && "Expected 'template' keyword");
531
532 // Handle the template <...> part.
533 SourceLocation TemplateLoc = ConsumeToken();
534 SmallVector<Decl*,8> TemplateParams;
535 SourceLocation LAngleLoc, RAngleLoc;
536 {
537 ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
538 if (ParseTemplateParameters(Depth + 1, TemplateParams, LAngleLoc,
539 RAngleLoc)) {
540 return 0;
541 }
542 }
543
544 // Generate a meaningful error if the user forgot to put class before the
545 // identifier, comma, or greater. Provide a fixit if the identifier, comma,
546 // or greater appear immediately or after 'typename' or 'struct'. In the
547 // latter case, replace the keyword with 'class'.
548 if (!Tok.is(tok::kw_class)) {
549 bool Replace = Tok.is(tok::kw_typename) || Tok.is(tok::kw_struct);
550 const Token& Next = Replace ? NextToken() : Tok;
551 if (Next.is(tok::identifier) || Next.is(tok::comma) ||
552 Next.is(tok::greater) || Next.is(tok::greatergreater) ||
553 Next.is(tok::ellipsis))
554 Diag(Tok.getLocation(), diag::err_class_on_template_template_param)
555 << (Replace ? FixItHint::CreateReplacement(Tok.getLocation(), "class")
556 : FixItHint::CreateInsertion(Tok.getLocation(), "class "));
557 else
558 Diag(Tok.getLocation(), diag::err_class_on_template_template_param);
559
560 if (Replace)
561 ConsumeToken();
562 } else
563 ConsumeToken();
564
565 // Parse the ellipsis, if given.
566 SourceLocation EllipsisLoc;
567 if (Tok.is(tok::ellipsis)) {
568 EllipsisLoc = ConsumeToken();
569
570 Diag(EllipsisLoc,
571 getLangOpts().CPlusPlus0x
572 ? diag::warn_cxx98_compat_variadic_templates
573 : diag::ext_variadic_templates);
574 }
575
576 // Get the identifier, if given.
577 SourceLocation NameLoc;
578 IdentifierInfo* ParamName = 0;
579 if (Tok.is(tok::identifier)) {
580 ParamName = Tok.getIdentifierInfo();
581 NameLoc = ConsumeToken();
582 } else if (Tok.is(tok::equal) || Tok.is(tok::comma) ||
583 Tok.is(tok::greater) || Tok.is(tok::greatergreater)) {
584 // Unnamed template parameter. Don't have to do anything here, just
585 // don't consume this token.
586 } else {
587 Diag(Tok.getLocation(), diag::err_expected_ident);
588 return 0;
589 }
590
591 TemplateParameterList *ParamList =
592 Actions.ActOnTemplateParameterList(Depth, SourceLocation(),
593 TemplateLoc, LAngleLoc,
594 TemplateParams.data(),
595 TemplateParams.size(),
596 RAngleLoc);
597
598 // Grab a default argument (if available).
599 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
600 // we introduce the template parameter into the local scope.
601 SourceLocation EqualLoc;
602 ParsedTemplateArgument DefaultArg;
603 if (Tok.is(tok::equal)) {
604 EqualLoc = ConsumeToken();
605 DefaultArg = ParseTemplateTemplateArgument();
606 if (DefaultArg.isInvalid()) {
607 Diag(Tok.getLocation(),
608 diag::err_default_template_template_parameter_not_template);
609 SkipUntil(tok::comma, tok::greater, tok::greatergreater, true, true);
610 }
611 }
612
613 return Actions.ActOnTemplateTemplateParameter(getCurScope(), TemplateLoc,
614 ParamList, EllipsisLoc,
615 ParamName, NameLoc, Depth,
616 Position, EqualLoc, DefaultArg);
617 }
618
619 /// ParseNonTypeTemplateParameter - Handle the parsing of non-type
620 /// template parameters (e.g., in "template<int Size> class array;").
621 ///
622 /// template-parameter:
623 /// ...
624 /// parameter-declaration
625 Decl *
ParseNonTypeTemplateParameter(unsigned Depth,unsigned Position)626 Parser::ParseNonTypeTemplateParameter(unsigned Depth, unsigned Position) {
627 // Parse the declaration-specifiers (i.e., the type).
628 // FIXME: The type should probably be restricted in some way... Not all
629 // declarators (parts of declarators?) are accepted for parameters.
630 DeclSpec DS(AttrFactory);
631 ParseDeclarationSpecifiers(DS);
632
633 // Parse this as a typename.
634 Declarator ParamDecl(DS, Declarator::TemplateParamContext);
635 ParseDeclarator(ParamDecl);
636 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) {
637 Diag(Tok.getLocation(), diag::err_expected_template_parameter);
638 return 0;
639 }
640
641 // If there is a default value, parse it.
642 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
643 // we introduce the template parameter into the local scope.
644 SourceLocation EqualLoc;
645 ExprResult DefaultArg;
646 if (Tok.is(tok::equal)) {
647 EqualLoc = ConsumeToken();
648
649 // C++ [temp.param]p15:
650 // When parsing a default template-argument for a non-type
651 // template-parameter, the first non-nested > is taken as the
652 // end of the template-parameter-list rather than a greater-than
653 // operator.
654 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
655
656 DefaultArg = ParseAssignmentExpression();
657 if (DefaultArg.isInvalid())
658 SkipUntil(tok::comma, tok::greater, true, true);
659 }
660
661 // Create the parameter.
662 return Actions.ActOnNonTypeTemplateParameter(getCurScope(), ParamDecl,
663 Depth, Position, EqualLoc,
664 DefaultArg.take());
665 }
666
667 /// \brief Parses a template-id that after the template name has
668 /// already been parsed.
669 ///
670 /// This routine takes care of parsing the enclosed template argument
671 /// list ('<' template-parameter-list [opt] '>') and placing the
672 /// results into a form that can be transferred to semantic analysis.
673 ///
674 /// \param Template the template declaration produced by isTemplateName
675 ///
676 /// \param TemplateNameLoc the source location of the template name
677 ///
678 /// \param SS if non-NULL, the nested-name-specifier preceding the
679 /// template name.
680 ///
681 /// \param ConsumeLastToken if true, then we will consume the last
682 /// token that forms the template-id. Otherwise, we will leave the
683 /// last token in the stream (e.g., so that it can be replaced with an
684 /// annotation token).
685 bool
ParseTemplateIdAfterTemplateName(TemplateTy Template,SourceLocation TemplateNameLoc,const CXXScopeSpec & SS,bool ConsumeLastToken,SourceLocation & LAngleLoc,TemplateArgList & TemplateArgs,SourceLocation & RAngleLoc)686 Parser::ParseTemplateIdAfterTemplateName(TemplateTy Template,
687 SourceLocation TemplateNameLoc,
688 const CXXScopeSpec &SS,
689 bool ConsumeLastToken,
690 SourceLocation &LAngleLoc,
691 TemplateArgList &TemplateArgs,
692 SourceLocation &RAngleLoc) {
693 assert(Tok.is(tok::less) && "Must have already parsed the template-name");
694
695 // Consume the '<'.
696 LAngleLoc = ConsumeToken();
697
698 // Parse the optional template-argument-list.
699 bool Invalid = false;
700 {
701 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
702 if (Tok.isNot(tok::greater) && Tok.isNot(tok::greatergreater))
703 Invalid = ParseTemplateArgumentList(TemplateArgs);
704
705 if (Invalid) {
706 // Try to find the closing '>'.
707 SkipUntil(tok::greater, true, !ConsumeLastToken);
708
709 return true;
710 }
711 }
712
713 if (Tok.isNot(tok::greater) && Tok.isNot(tok::greatergreater)) {
714 Diag(Tok.getLocation(), diag::err_expected_greater);
715 return true;
716 }
717
718 // Determine the location of the '>' or '>>'. Only consume this
719 // token if the caller asked us to.
720 RAngleLoc = Tok.getLocation();
721
722 if (Tok.is(tok::greatergreater)) {
723 const char *ReplaceStr = "> >";
724 if (NextToken().is(tok::greater) || NextToken().is(tok::greatergreater))
725 ReplaceStr = "> > ";
726
727 Diag(Tok.getLocation(), getLangOpts().CPlusPlus0x ?
728 diag::warn_cxx98_compat_two_right_angle_brackets :
729 diag::err_two_right_angle_brackets_need_space)
730 << FixItHint::CreateReplacement(SourceRange(Tok.getLocation()),
731 ReplaceStr);
732
733 Tok.setKind(tok::greater);
734 if (!ConsumeLastToken) {
735 // Since we're not supposed to consume the '>>' token, we need
736 // to insert a second '>' token after the first.
737 PP.EnterToken(Tok);
738 }
739 } else if (ConsumeLastToken)
740 ConsumeToken();
741
742 return false;
743 }
744
745 /// \brief Replace the tokens that form a simple-template-id with an
746 /// annotation token containing the complete template-id.
747 ///
748 /// The first token in the stream must be the name of a template that
749 /// is followed by a '<'. This routine will parse the complete
750 /// simple-template-id and replace the tokens with a single annotation
751 /// token with one of two different kinds: if the template-id names a
752 /// type (and \p AllowTypeAnnotation is true), the annotation token is
753 /// a type annotation that includes the optional nested-name-specifier
754 /// (\p SS). Otherwise, the annotation token is a template-id
755 /// annotation that does not include the optional
756 /// nested-name-specifier.
757 ///
758 /// \param Template the declaration of the template named by the first
759 /// token (an identifier), as returned from \c Action::isTemplateName().
760 ///
761 /// \param TemplateNameKind the kind of template that \p Template
762 /// refers to, as returned from \c Action::isTemplateName().
763 ///
764 /// \param SS if non-NULL, the nested-name-specifier that precedes
765 /// this template name.
766 ///
767 /// \param TemplateKWLoc if valid, specifies that this template-id
768 /// annotation was preceded by the 'template' keyword and gives the
769 /// location of that keyword. If invalid (the default), then this
770 /// template-id was not preceded by a 'template' keyword.
771 ///
772 /// \param AllowTypeAnnotation if true (the default), then a
773 /// simple-template-id that refers to a class template, template
774 /// template parameter, or other template that produces a type will be
775 /// replaced with a type annotation token. Otherwise, the
776 /// simple-template-id is always replaced with a template-id
777 /// annotation token.
778 ///
779 /// If an unrecoverable parse error occurs and no annotation token can be
780 /// formed, this function returns true.
781 ///
AnnotateTemplateIdToken(TemplateTy Template,TemplateNameKind TNK,CXXScopeSpec & SS,SourceLocation TemplateKWLoc,UnqualifiedId & TemplateName,bool AllowTypeAnnotation)782 bool Parser::AnnotateTemplateIdToken(TemplateTy Template, TemplateNameKind TNK,
783 CXXScopeSpec &SS,
784 SourceLocation TemplateKWLoc,
785 UnqualifiedId &TemplateName,
786 bool AllowTypeAnnotation) {
787 assert(getLangOpts().CPlusPlus && "Can only annotate template-ids in C++");
788 assert(Template && Tok.is(tok::less) &&
789 "Parser isn't at the beginning of a template-id");
790
791 // Consume the template-name.
792 SourceLocation TemplateNameLoc = TemplateName.getSourceRange().getBegin();
793
794 // Parse the enclosed template argument list.
795 SourceLocation LAngleLoc, RAngleLoc;
796 TemplateArgList TemplateArgs;
797 bool Invalid = ParseTemplateIdAfterTemplateName(Template,
798 TemplateNameLoc,
799 SS, false, LAngleLoc,
800 TemplateArgs,
801 RAngleLoc);
802
803 if (Invalid) {
804 // If we failed to parse the template ID but skipped ahead to a >, we're not
805 // going to be able to form a token annotation. Eat the '>' if present.
806 if (Tok.is(tok::greater))
807 ConsumeToken();
808 return true;
809 }
810
811 ASTTemplateArgsPtr TemplateArgsPtr(Actions, TemplateArgs.data(),
812 TemplateArgs.size());
813
814 // Build the annotation token.
815 if (TNK == TNK_Type_template && AllowTypeAnnotation) {
816 TypeResult Type
817 = Actions.ActOnTemplateIdType(SS, TemplateKWLoc,
818 Template, TemplateNameLoc,
819 LAngleLoc, TemplateArgsPtr, RAngleLoc);
820 if (Type.isInvalid()) {
821 // If we failed to parse the template ID but skipped ahead to a >, we're not
822 // going to be able to form a token annotation. Eat the '>' if present.
823 if (Tok.is(tok::greater))
824 ConsumeToken();
825 return true;
826 }
827
828 Tok.setKind(tok::annot_typename);
829 setTypeAnnotation(Tok, Type.get());
830 if (SS.isNotEmpty())
831 Tok.setLocation(SS.getBeginLoc());
832 else if (TemplateKWLoc.isValid())
833 Tok.setLocation(TemplateKWLoc);
834 else
835 Tok.setLocation(TemplateNameLoc);
836 } else {
837 // Build a template-id annotation token that can be processed
838 // later.
839 Tok.setKind(tok::annot_template_id);
840 TemplateIdAnnotation *TemplateId
841 = TemplateIdAnnotation::Allocate(TemplateArgs.size(), TemplateIds);
842 TemplateId->TemplateNameLoc = TemplateNameLoc;
843 if (TemplateName.getKind() == UnqualifiedId::IK_Identifier) {
844 TemplateId->Name = TemplateName.Identifier;
845 TemplateId->Operator = OO_None;
846 } else {
847 TemplateId->Name = 0;
848 TemplateId->Operator = TemplateName.OperatorFunctionId.Operator;
849 }
850 TemplateId->SS = SS;
851 TemplateId->TemplateKWLoc = TemplateKWLoc;
852 TemplateId->Template = Template;
853 TemplateId->Kind = TNK;
854 TemplateId->LAngleLoc = LAngleLoc;
855 TemplateId->RAngleLoc = RAngleLoc;
856 ParsedTemplateArgument *Args = TemplateId->getTemplateArgs();
857 for (unsigned Arg = 0, ArgEnd = TemplateArgs.size(); Arg != ArgEnd; ++Arg)
858 Args[Arg] = ParsedTemplateArgument(TemplateArgs[Arg]);
859 Tok.setAnnotationValue(TemplateId);
860 if (TemplateKWLoc.isValid())
861 Tok.setLocation(TemplateKWLoc);
862 else
863 Tok.setLocation(TemplateNameLoc);
864
865 TemplateArgsPtr.release();
866 }
867
868 // Common fields for the annotation token
869 Tok.setAnnotationEndLoc(RAngleLoc);
870
871 // In case the tokens were cached, have Preprocessor replace them with the
872 // annotation token.
873 PP.AnnotateCachedTokens(Tok);
874 return false;
875 }
876
877 /// \brief Replaces a template-id annotation token with a type
878 /// annotation token.
879 ///
880 /// If there was a failure when forming the type from the template-id,
881 /// a type annotation token will still be created, but will have a
882 /// NULL type pointer to signify an error.
AnnotateTemplateIdTokenAsType()883 void Parser::AnnotateTemplateIdTokenAsType() {
884 assert(Tok.is(tok::annot_template_id) && "Requires template-id tokens");
885
886 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
887 assert((TemplateId->Kind == TNK_Type_template ||
888 TemplateId->Kind == TNK_Dependent_template_name) &&
889 "Only works for type and dependent templates");
890
891 ASTTemplateArgsPtr TemplateArgsPtr(Actions,
892 TemplateId->getTemplateArgs(),
893 TemplateId->NumArgs);
894
895 TypeResult Type
896 = Actions.ActOnTemplateIdType(TemplateId->SS,
897 TemplateId->TemplateKWLoc,
898 TemplateId->Template,
899 TemplateId->TemplateNameLoc,
900 TemplateId->LAngleLoc,
901 TemplateArgsPtr,
902 TemplateId->RAngleLoc);
903 // Create the new "type" annotation token.
904 Tok.setKind(tok::annot_typename);
905 setTypeAnnotation(Tok, Type.isInvalid() ? ParsedType() : Type.get());
906 if (TemplateId->SS.isNotEmpty()) // it was a C++ qualified type name.
907 Tok.setLocation(TemplateId->SS.getBeginLoc());
908 // End location stays the same
909
910 // Replace the template-id annotation token, and possible the scope-specifier
911 // that precedes it, with the typename annotation token.
912 PP.AnnotateCachedTokens(Tok);
913 }
914
915 /// \brief Determine whether the given token can end a template argument.
isEndOfTemplateArgument(Token Tok)916 static bool isEndOfTemplateArgument(Token Tok) {
917 return Tok.is(tok::comma) || Tok.is(tok::greater) ||
918 Tok.is(tok::greatergreater);
919 }
920
921 /// \brief Parse a C++ template template argument.
ParseTemplateTemplateArgument()922 ParsedTemplateArgument Parser::ParseTemplateTemplateArgument() {
923 if (!Tok.is(tok::identifier) && !Tok.is(tok::coloncolon) &&
924 !Tok.is(tok::annot_cxxscope))
925 return ParsedTemplateArgument();
926
927 // C++0x [temp.arg.template]p1:
928 // A template-argument for a template template-parameter shall be the name
929 // of a class template or an alias template, expressed as id-expression.
930 //
931 // We parse an id-expression that refers to a class template or alias
932 // template. The grammar we parse is:
933 //
934 // nested-name-specifier[opt] template[opt] identifier ...[opt]
935 //
936 // followed by a token that terminates a template argument, such as ',',
937 // '>', or (in some cases) '>>'.
938 CXXScopeSpec SS; // nested-name-specifier, if present
939 ParseOptionalCXXScopeSpecifier(SS, ParsedType(),
940 /*EnteringContext=*/false);
941
942 ParsedTemplateArgument Result;
943 SourceLocation EllipsisLoc;
944 if (SS.isSet() && Tok.is(tok::kw_template)) {
945 // Parse the optional 'template' keyword following the
946 // nested-name-specifier.
947 SourceLocation TemplateKWLoc = ConsumeToken();
948
949 if (Tok.is(tok::identifier)) {
950 // We appear to have a dependent template name.
951 UnqualifiedId Name;
952 Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
953 ConsumeToken(); // the identifier
954
955 // Parse the ellipsis.
956 if (Tok.is(tok::ellipsis))
957 EllipsisLoc = ConsumeToken();
958
959 // If the next token signals the end of a template argument,
960 // then we have a dependent template name that could be a template
961 // template argument.
962 TemplateTy Template;
963 if (isEndOfTemplateArgument(Tok) &&
964 Actions.ActOnDependentTemplateName(getCurScope(),
965 SS, TemplateKWLoc, Name,
966 /*ObjectType=*/ ParsedType(),
967 /*EnteringContext=*/false,
968 Template))
969 Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
970 }
971 } else if (Tok.is(tok::identifier)) {
972 // We may have a (non-dependent) template name.
973 TemplateTy Template;
974 UnqualifiedId Name;
975 Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
976 ConsumeToken(); // the identifier
977
978 // Parse the ellipsis.
979 if (Tok.is(tok::ellipsis))
980 EllipsisLoc = ConsumeToken();
981
982 if (isEndOfTemplateArgument(Tok)) {
983 bool MemberOfUnknownSpecialization;
984 TemplateNameKind TNK = Actions.isTemplateName(getCurScope(), SS,
985 /*hasTemplateKeyword=*/false,
986 Name,
987 /*ObjectType=*/ ParsedType(),
988 /*EnteringContext=*/false,
989 Template,
990 MemberOfUnknownSpecialization);
991 if (TNK == TNK_Dependent_template_name || TNK == TNK_Type_template) {
992 // We have an id-expression that refers to a class template or
993 // (C++0x) alias template.
994 Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
995 }
996 }
997 }
998
999 // If this is a pack expansion, build it as such.
1000 if (EllipsisLoc.isValid() && !Result.isInvalid())
1001 Result = Actions.ActOnPackExpansion(Result, EllipsisLoc);
1002
1003 return Result;
1004 }
1005
1006 /// ParseTemplateArgument - Parse a C++ template argument (C++ [temp.names]).
1007 ///
1008 /// template-argument: [C++ 14.2]
1009 /// constant-expression
1010 /// type-id
1011 /// id-expression
ParseTemplateArgument()1012 ParsedTemplateArgument Parser::ParseTemplateArgument() {
1013 // C++ [temp.arg]p2:
1014 // In a template-argument, an ambiguity between a type-id and an
1015 // expression is resolved to a type-id, regardless of the form of
1016 // the corresponding template-parameter.
1017 //
1018 // Therefore, we initially try to parse a type-id.
1019 if (isCXXTypeId(TypeIdAsTemplateArgument)) {
1020 SourceLocation Loc = Tok.getLocation();
1021 TypeResult TypeArg = ParseTypeName(/*Range=*/0,
1022 Declarator::TemplateTypeArgContext);
1023 if (TypeArg.isInvalid())
1024 return ParsedTemplateArgument();
1025
1026 return ParsedTemplateArgument(ParsedTemplateArgument::Type,
1027 TypeArg.get().getAsOpaquePtr(),
1028 Loc);
1029 }
1030
1031 // Try to parse a template template argument.
1032 {
1033 TentativeParsingAction TPA(*this);
1034
1035 ParsedTemplateArgument TemplateTemplateArgument
1036 = ParseTemplateTemplateArgument();
1037 if (!TemplateTemplateArgument.isInvalid()) {
1038 TPA.Commit();
1039 return TemplateTemplateArgument;
1040 }
1041
1042 // Revert this tentative parse to parse a non-type template argument.
1043 TPA.Revert();
1044 }
1045
1046 // Parse a non-type template argument.
1047 SourceLocation Loc = Tok.getLocation();
1048 ExprResult ExprArg = ParseConstantExpression(MaybeTypeCast);
1049 if (ExprArg.isInvalid() || !ExprArg.get())
1050 return ParsedTemplateArgument();
1051
1052 return ParsedTemplateArgument(ParsedTemplateArgument::NonType,
1053 ExprArg.release(), Loc);
1054 }
1055
1056 /// \brief Determine whether the current tokens can only be parsed as a
1057 /// template argument list (starting with the '<') and never as a '<'
1058 /// expression.
IsTemplateArgumentList(unsigned Skip)1059 bool Parser::IsTemplateArgumentList(unsigned Skip) {
1060 struct AlwaysRevertAction : TentativeParsingAction {
1061 AlwaysRevertAction(Parser &P) : TentativeParsingAction(P) { }
1062 ~AlwaysRevertAction() { Revert(); }
1063 } Tentative(*this);
1064
1065 while (Skip) {
1066 ConsumeToken();
1067 --Skip;
1068 }
1069
1070 // '<'
1071 if (!Tok.is(tok::less))
1072 return false;
1073 ConsumeToken();
1074
1075 // An empty template argument list.
1076 if (Tok.is(tok::greater))
1077 return true;
1078
1079 // See whether we have declaration specifiers, which indicate a type.
1080 while (isCXXDeclarationSpecifier() == TPResult::True())
1081 ConsumeToken();
1082
1083 // If we have a '>' or a ',' then this is a template argument list.
1084 return Tok.is(tok::greater) || Tok.is(tok::comma);
1085 }
1086
1087 /// ParseTemplateArgumentList - Parse a C++ template-argument-list
1088 /// (C++ [temp.names]). Returns true if there was an error.
1089 ///
1090 /// template-argument-list: [C++ 14.2]
1091 /// template-argument
1092 /// template-argument-list ',' template-argument
1093 bool
ParseTemplateArgumentList(TemplateArgList & TemplateArgs)1094 Parser::ParseTemplateArgumentList(TemplateArgList &TemplateArgs) {
1095 while (true) {
1096 ParsedTemplateArgument Arg = ParseTemplateArgument();
1097 if (Tok.is(tok::ellipsis)) {
1098 SourceLocation EllipsisLoc = ConsumeToken();
1099 Arg = Actions.ActOnPackExpansion(Arg, EllipsisLoc);
1100 }
1101
1102 if (Arg.isInvalid()) {
1103 SkipUntil(tok::comma, tok::greater, true, true);
1104 return true;
1105 }
1106
1107 // Save this template argument.
1108 TemplateArgs.push_back(Arg);
1109
1110 // If the next token is a comma, consume it and keep reading
1111 // arguments.
1112 if (Tok.isNot(tok::comma)) break;
1113
1114 // Consume the comma.
1115 ConsumeToken();
1116 }
1117
1118 return false;
1119 }
1120
1121 /// \brief Parse a C++ explicit template instantiation
1122 /// (C++ [temp.explicit]).
1123 ///
1124 /// explicit-instantiation:
1125 /// 'extern' [opt] 'template' declaration
1126 ///
1127 /// Note that the 'extern' is a GNU extension and C++0x feature.
ParseExplicitInstantiation(unsigned Context,SourceLocation ExternLoc,SourceLocation TemplateLoc,SourceLocation & DeclEnd,AccessSpecifier AS)1128 Decl *Parser::ParseExplicitInstantiation(unsigned Context,
1129 SourceLocation ExternLoc,
1130 SourceLocation TemplateLoc,
1131 SourceLocation &DeclEnd,
1132 AccessSpecifier AS) {
1133 // This isn't really required here.
1134 ParsingDeclRAIIObject ParsingTemplateParams(*this);
1135
1136 return ParseSingleDeclarationAfterTemplate(Context,
1137 ParsedTemplateInfo(ExternLoc,
1138 TemplateLoc),
1139 ParsingTemplateParams,
1140 DeclEnd, AS);
1141 }
1142
getSourceRange() const1143 SourceRange Parser::ParsedTemplateInfo::getSourceRange() const {
1144 if (TemplateParams)
1145 return getTemplateParamsRange(TemplateParams->data(),
1146 TemplateParams->size());
1147
1148 SourceRange R(TemplateLoc);
1149 if (ExternLoc.isValid())
1150 R.setBegin(ExternLoc);
1151 return R;
1152 }
1153
LateTemplateParserCallback(void * P,const FunctionDecl * FD)1154 void Parser::LateTemplateParserCallback(void *P, const FunctionDecl *FD) {
1155 ((Parser*)P)->LateTemplateParser(FD);
1156 }
1157
1158
LateTemplateParser(const FunctionDecl * FD)1159 void Parser::LateTemplateParser(const FunctionDecl *FD) {
1160 LateParsedTemplatedFunction *LPT = LateParsedTemplateMap[FD];
1161 if (LPT) {
1162 ParseLateTemplatedFuncDef(*LPT);
1163 return;
1164 }
1165
1166 llvm_unreachable("Late templated function without associated lexed tokens");
1167 }
1168
1169 /// \brief Late parse a C++ function template in Microsoft mode.
ParseLateTemplatedFuncDef(LateParsedTemplatedFunction & LMT)1170 void Parser::ParseLateTemplatedFuncDef(LateParsedTemplatedFunction &LMT) {
1171 if(!LMT.D)
1172 return;
1173
1174 // Get the FunctionDecl.
1175 FunctionDecl *FD = 0;
1176 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(LMT.D))
1177 FD = FunTmpl->getTemplatedDecl();
1178 else
1179 FD = cast<FunctionDecl>(LMT.D);
1180
1181 // To restore the context after late parsing.
1182 Sema::ContextRAII GlobalSavedContext(Actions, Actions.CurContext);
1183
1184 SmallVector<ParseScope*, 4> TemplateParamScopeStack;
1185 DeclaratorDecl* Declarator = dyn_cast<DeclaratorDecl>(FD);
1186 if (Declarator && Declarator->getNumTemplateParameterLists() != 0) {
1187 TemplateParamScopeStack.push_back(new ParseScope(this, Scope::TemplateParamScope));
1188 Actions.ActOnReenterDeclaratorTemplateScope(getCurScope(), Declarator);
1189 Actions.ActOnReenterTemplateScope(getCurScope(), LMT.D);
1190 } else {
1191 // Get the list of DeclContext to reenter.
1192 SmallVector<DeclContext*, 4> DeclContextToReenter;
1193 DeclContext *DD = FD->getLexicalParent();
1194 while (DD && !DD->isTranslationUnit()) {
1195 DeclContextToReenter.push_back(DD);
1196 DD = DD->getLexicalParent();
1197 }
1198
1199 // Reenter template scopes from outmost to innermost.
1200 SmallVector<DeclContext*, 4>::reverse_iterator II =
1201 DeclContextToReenter.rbegin();
1202 for (; II != DeclContextToReenter.rend(); ++II) {
1203 if (ClassTemplatePartialSpecializationDecl* MD =
1204 dyn_cast_or_null<ClassTemplatePartialSpecializationDecl>(*II)) {
1205 TemplateParamScopeStack.push_back(new ParseScope(this,
1206 Scope::TemplateParamScope));
1207 Actions.ActOnReenterTemplateScope(getCurScope(), MD);
1208 } else if (CXXRecordDecl* MD = dyn_cast_or_null<CXXRecordDecl>(*II)) {
1209 TemplateParamScopeStack.push_back(new ParseScope(this,
1210 Scope::TemplateParamScope,
1211 MD->getDescribedClassTemplate() != 0 ));
1212 Actions.ActOnReenterTemplateScope(getCurScope(),
1213 MD->getDescribedClassTemplate());
1214 }
1215 TemplateParamScopeStack.push_back(new ParseScope(this, Scope::DeclScope));
1216 Actions.PushDeclContext(Actions.getCurScope(), *II);
1217 }
1218 TemplateParamScopeStack.push_back(new ParseScope(this,
1219 Scope::TemplateParamScope));
1220 Actions.ActOnReenterTemplateScope(getCurScope(), LMT.D);
1221 }
1222
1223 assert(!LMT.Toks.empty() && "Empty body!");
1224
1225 // Append the current token at the end of the new token stream so that it
1226 // doesn't get lost.
1227 LMT.Toks.push_back(Tok);
1228 PP.EnterTokenStream(LMT.Toks.data(), LMT.Toks.size(), true, false);
1229
1230 // Consume the previously pushed token.
1231 ConsumeAnyToken();
1232 assert((Tok.is(tok::l_brace) || Tok.is(tok::colon) || Tok.is(tok::kw_try))
1233 && "Inline method not starting with '{', ':' or 'try'");
1234
1235 // Parse the method body. Function body parsing code is similar enough
1236 // to be re-used for method bodies as well.
1237 ParseScope FnScope(this, Scope::FnScope|Scope::DeclScope);
1238
1239 // Recreate the containing function DeclContext.
1240 Sema::ContextRAII FunctionSavedContext(Actions, Actions.getContainingDC(FD));
1241
1242 if (FunctionTemplateDecl *FunctionTemplate
1243 = dyn_cast_or_null<FunctionTemplateDecl>(LMT.D))
1244 Actions.ActOnStartOfFunctionDef(getCurScope(),
1245 FunctionTemplate->getTemplatedDecl());
1246 if (FunctionDecl *Function = dyn_cast_or_null<FunctionDecl>(LMT.D))
1247 Actions.ActOnStartOfFunctionDef(getCurScope(), Function);
1248
1249
1250 if (Tok.is(tok::kw_try)) {
1251 ParseFunctionTryBlock(LMT.D, FnScope);
1252 } else {
1253 if (Tok.is(tok::colon))
1254 ParseConstructorInitializer(LMT.D);
1255 else
1256 Actions.ActOnDefaultCtorInitializers(LMT.D);
1257
1258 if (Tok.is(tok::l_brace)) {
1259 ParseFunctionStatementBody(LMT.D, FnScope);
1260 Actions.MarkAsLateParsedTemplate(FD, false);
1261 } else
1262 Actions.ActOnFinishFunctionBody(LMT.D, 0);
1263 }
1264
1265 // Exit scopes.
1266 FnScope.Exit();
1267 SmallVector<ParseScope*, 4>::reverse_iterator I =
1268 TemplateParamScopeStack.rbegin();
1269 for (; I != TemplateParamScopeStack.rend(); ++I)
1270 delete *I;
1271
1272 DeclGroupPtrTy grp = Actions.ConvertDeclToDeclGroup(LMT.D);
1273 if (grp)
1274 Actions.getASTConsumer().HandleTopLevelDecl(grp.get());
1275 }
1276
1277 /// \brief Lex a delayed template function for late parsing.
LexTemplateFunctionForLateParsing(CachedTokens & Toks)1278 void Parser::LexTemplateFunctionForLateParsing(CachedTokens &Toks) {
1279 tok::TokenKind kind = Tok.getKind();
1280 if (!ConsumeAndStoreFunctionPrologue(Toks)) {
1281 // Consume everything up to (and including) the matching right brace.
1282 ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
1283 }
1284
1285 // If we're in a function-try-block, we need to store all the catch blocks.
1286 if (kind == tok::kw_try) {
1287 while (Tok.is(tok::kw_catch)) {
1288 ConsumeAndStoreUntil(tok::l_brace, Toks, /*StopAtSemi=*/false);
1289 ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
1290 }
1291 }
1292 }
1293