1 //===--- TemplateBase.cpp - Common template AST class implementation ------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements common classes used throughout C++ template
13 //===----------------------------------------------------------------------===//
15 #include "clang/AST/TemplateBase.h"
16 #include "clang/AST/ASTContext.h"
17 #include "clang/AST/DeclBase.h"
18 #include "clang/AST/DeclTemplate.h"
19 #include "clang/AST/Expr.h"
20 #include "clang/AST/ExprCXX.h"
21 #include "clang/AST/Type.h"
22 #include "clang/AST/TypeLoc.h"
23 #include "clang/Basic/Diagnostic.h"
24 #include "llvm/ADT/FoldingSet.h"
25 #include "llvm/ADT/SmallString.h"
26 #include "llvm/Support/raw_ostream.h"
29 using namespace clang;
31 /// \brief Print a template integral argument value.
33 /// \param TemplArg the TemplateArgument instance to print.
35 /// \param Out the raw_ostream instance to use for printing.
37 /// \param Policy the printing policy for EnumConstantDecl printing.
38 static void printIntegral(const TemplateArgument &TemplArg,
39 raw_ostream &Out, const PrintingPolicy& Policy) {
40 const ::clang::Type *T = TemplArg.getIntegralType().getTypePtr();
41 const llvm::APSInt &Val = TemplArg.getAsIntegral();
43 if (const EnumType *ET = T->getAs<EnumType>()) {
44 for (const EnumConstantDecl* ECD : ET->getDecl()->enumerators()) {
45 if (ECD->getInitVal() == Val) {
46 ECD->printQualifiedName(Out, Policy);
52 if (T->isBooleanType()) {
53 Out << (Val.getBoolValue() ? "true" : "false");
54 } else if (T->isCharType()) {
55 const char Ch = Val.getZExtValue();
56 Out << ((Ch == '\'') ? "'\\" : "'");
57 Out.write_escaped(StringRef(&Ch, 1), /*UseHexEscapes=*/ true);
64 //===----------------------------------------------------------------------===//
65 // TemplateArgument Implementation
66 //===----------------------------------------------------------------------===//
68 TemplateArgument::TemplateArgument(ASTContext &Ctx, const llvm::APSInt &Value,
70 Integer.Kind = Integral;
71 // Copy the APSInt value into our decomposed form.
72 Integer.BitWidth = Value.getBitWidth();
73 Integer.IsUnsigned = Value.isUnsigned();
74 // If the value is large, we have to get additional memory from the ASTContext
75 unsigned NumWords = Value.getNumWords();
77 void *Mem = Ctx.Allocate(NumWords * sizeof(uint64_t));
78 std::memcpy(Mem, Value.getRawData(), NumWords * sizeof(uint64_t));
79 Integer.pVal = static_cast<uint64_t *>(Mem);
81 Integer.VAL = Value.getZExtValue();
84 Integer.Type = Type.getAsOpaquePtr();
87 TemplateArgument TemplateArgument::CreatePackCopy(ASTContext &Context,
88 const TemplateArgument *Args,
91 return getEmptyPack();
93 TemplateArgument *Storage = new (Context) TemplateArgument [NumArgs];
94 std::copy(Args, Args + NumArgs, Storage);
95 return TemplateArgument(Storage, NumArgs);
98 bool TemplateArgument::isDependent() const {
101 llvm_unreachable("Should not have a NULL template argument");
104 return getAsType()->isDependentType() ||
105 isa<PackExpansionType>(getAsType());
108 return getAsTemplate().isDependent();
110 case TemplateExpansion:
114 if (DeclContext *DC = dyn_cast<DeclContext>(getAsDecl()))
115 return DC->isDependentContext();
116 return getAsDecl()->getDeclContext()->isDependentContext();
126 return (getAsExpr()->isTypeDependent() || getAsExpr()->isValueDependent() ||
127 isa<PackExpansionExpr>(getAsExpr()));
130 for (const auto &P : pack_elements())
136 llvm_unreachable("Invalid TemplateArgument Kind!");
139 bool TemplateArgument::isInstantiationDependent() const {
142 llvm_unreachable("Should not have a NULL template argument");
145 return getAsType()->isInstantiationDependentType();
148 return getAsTemplate().isInstantiationDependent();
150 case TemplateExpansion:
154 if (DeclContext *DC = dyn_cast<DeclContext>(getAsDecl()))
155 return DC->isDependentContext();
156 return getAsDecl()->getDeclContext()->isDependentContext();
166 return getAsExpr()->isInstantiationDependent();
169 for (const auto &P : pack_elements())
170 if (P.isInstantiationDependent())
175 llvm_unreachable("Invalid TemplateArgument Kind!");
178 bool TemplateArgument::isPackExpansion() const {
188 case TemplateExpansion:
192 return isa<PackExpansionType>(getAsType());
195 return isa<PackExpansionExpr>(getAsExpr());
198 llvm_unreachable("Invalid TemplateArgument Kind!");
201 bool TemplateArgument::containsUnexpandedParameterPack() const {
206 case TemplateExpansion:
211 if (getAsType()->containsUnexpandedParameterPack())
216 if (getAsTemplate().containsUnexpandedParameterPack())
221 if (getAsExpr()->containsUnexpandedParameterPack())
226 for (const auto &P : pack_elements())
227 if (P.containsUnexpandedParameterPack())
236 Optional<unsigned> TemplateArgument::getNumTemplateExpansions() const {
237 assert(getKind() == TemplateExpansion);
238 if (TemplateArg.NumExpansions)
239 return TemplateArg.NumExpansions - 1;
244 void TemplateArgument::Profile(llvm::FoldingSetNodeID &ID,
245 const ASTContext &Context) const {
246 ID.AddInteger(getKind());
252 getAsType().Profile(ID);
256 getNullPtrType().Profile(ID);
260 ID.AddPointer(getAsDecl()? getAsDecl()->getCanonicalDecl() : nullptr);
264 case TemplateExpansion: {
265 TemplateName Template = getAsTemplateOrTemplatePattern();
266 if (TemplateTemplateParmDecl *TTP
267 = dyn_cast_or_null<TemplateTemplateParmDecl>(
268 Template.getAsTemplateDecl())) {
270 ID.AddInteger(TTP->getDepth());
271 ID.AddInteger(TTP->getPosition());
272 ID.AddBoolean(TTP->isParameterPack());
274 ID.AddBoolean(false);
275 ID.AddPointer(Context.getCanonicalTemplateName(Template)
276 .getAsVoidPointer());
282 getAsIntegral().Profile(ID);
283 getIntegralType().Profile(ID);
287 getAsExpr()->Profile(ID, Context, true);
291 ID.AddInteger(Args.NumArgs);
292 for (unsigned I = 0; I != Args.NumArgs; ++I)
293 Args.Args[I].Profile(ID, Context);
297 bool TemplateArgument::structurallyEquals(const TemplateArgument &Other) const {
298 if (getKind() != Other.getKind()) return false;
305 case TemplateExpansion:
307 return TypeOrValue.V == Other.TypeOrValue.V;
310 return getAsDecl() == Other.getAsDecl();
313 return getIntegralType() == Other.getIntegralType() &&
314 getAsIntegral() == Other.getAsIntegral();
317 if (Args.NumArgs != Other.Args.NumArgs) return false;
318 for (unsigned I = 0, E = Args.NumArgs; I != E; ++I)
319 if (!Args.Args[I].structurallyEquals(Other.Args.Args[I]))
324 llvm_unreachable("Invalid TemplateArgument Kind!");
327 TemplateArgument TemplateArgument::getPackExpansionPattern() const {
328 assert(isPackExpansion());
332 return getAsType()->getAs<PackExpansionType>()->getPattern();
335 return cast<PackExpansionExpr>(getAsExpr())->getPattern();
337 case TemplateExpansion:
338 return TemplateArgument(getAsTemplateOrTemplatePattern());
346 return TemplateArgument();
349 llvm_unreachable("Invalid TemplateArgument Kind!");
352 void TemplateArgument::print(const PrintingPolicy &Policy,
353 raw_ostream &Out) const {
360 PrintingPolicy SubPolicy(Policy);
361 SubPolicy.SuppressStrongLifetime = true;
362 getAsType().print(Out, SubPolicy);
367 NamedDecl *ND = cast<NamedDecl>(getAsDecl());
369 if (ND->getDeclName()) {
370 // FIXME: distinguish between pointer and reference args?
371 ND->printQualifiedName(Out);
373 Out << "(anonymous)";
383 getAsTemplate().print(Out, Policy);
386 case TemplateExpansion:
387 getAsTemplateOrTemplatePattern().print(Out, Policy);
392 printIntegral(*this, Out, Policy);
397 getAsExpr()->printPretty(Out, nullptr, Policy);
403 for (const auto &P : pack_elements()) {
409 P.print(Policy, Out);
416 //===----------------------------------------------------------------------===//
417 // TemplateArgumentLoc Implementation
418 //===----------------------------------------------------------------------===//
420 TemplateArgumentLocInfo::TemplateArgumentLocInfo() {
421 memset((void*)this, 0, sizeof(TemplateArgumentLocInfo));
424 SourceRange TemplateArgumentLoc::getSourceRange() const {
425 switch (Argument.getKind()) {
426 case TemplateArgument::Expression:
427 return getSourceExpression()->getSourceRange();
429 case TemplateArgument::Declaration:
430 return getSourceDeclExpression()->getSourceRange();
432 case TemplateArgument::NullPtr:
433 return getSourceNullPtrExpression()->getSourceRange();
435 case TemplateArgument::Type:
436 if (TypeSourceInfo *TSI = getTypeSourceInfo())
437 return TSI->getTypeLoc().getSourceRange();
439 return SourceRange();
441 case TemplateArgument::Template:
442 if (getTemplateQualifierLoc())
443 return SourceRange(getTemplateQualifierLoc().getBeginLoc(),
444 getTemplateNameLoc());
445 return SourceRange(getTemplateNameLoc());
447 case TemplateArgument::TemplateExpansion:
448 if (getTemplateQualifierLoc())
449 return SourceRange(getTemplateQualifierLoc().getBeginLoc(),
450 getTemplateEllipsisLoc());
451 return SourceRange(getTemplateNameLoc(), getTemplateEllipsisLoc());
453 case TemplateArgument::Integral:
454 return getSourceIntegralExpression()->getSourceRange();
456 case TemplateArgument::Pack:
457 case TemplateArgument::Null:
458 return SourceRange();
461 llvm_unreachable("Invalid TemplateArgument Kind!");
464 const DiagnosticBuilder &clang::operator<<(const DiagnosticBuilder &DB,
465 const TemplateArgument &Arg) {
466 switch (Arg.getKind()) {
467 case TemplateArgument::Null:
468 // This is bad, but not as bad as crashing because of argument
470 return DB << "(null template argument)";
472 case TemplateArgument::Type:
473 return DB << Arg.getAsType();
475 case TemplateArgument::Declaration:
476 return DB << Arg.getAsDecl();
478 case TemplateArgument::NullPtr:
479 return DB << "nullptr";
481 case TemplateArgument::Integral:
482 return DB << Arg.getAsIntegral().toString(10);
484 case TemplateArgument::Template:
485 return DB << Arg.getAsTemplate();
487 case TemplateArgument::TemplateExpansion:
488 return DB << Arg.getAsTemplateOrTemplatePattern() << "...";
490 case TemplateArgument::Expression: {
491 // This shouldn't actually ever happen, so it's okay that we're
492 // regurgitating an expression here.
493 // FIXME: We're guessing at LangOptions!
495 llvm::raw_svector_ostream OS(Str);
496 LangOptions LangOpts;
497 LangOpts.CPlusPlus = true;
498 PrintingPolicy Policy(LangOpts);
499 Arg.getAsExpr()->printPretty(OS, nullptr, Policy);
500 return DB << OS.str();
503 case TemplateArgument::Pack: {
504 // FIXME: We're guessing at LangOptions!
506 llvm::raw_svector_ostream OS(Str);
507 LangOptions LangOpts;
508 LangOpts.CPlusPlus = true;
509 PrintingPolicy Policy(LangOpts);
510 Arg.print(Policy, OS);
511 return DB << OS.str();
515 llvm_unreachable("Invalid TemplateArgument Kind!");
518 const ASTTemplateArgumentListInfo *
519 ASTTemplateArgumentListInfo::Create(ASTContext &C,
520 const TemplateArgumentListInfo &List) {
521 assert(llvm::alignOf<ASTTemplateArgumentListInfo>() >=
522 llvm::alignOf<TemplateArgumentLoc>());
523 std::size_t size = ASTTemplateArgumentListInfo::sizeFor(List.size());
524 void *Mem = C.Allocate(size, llvm::alignOf<ASTTemplateArgumentListInfo>());
525 ASTTemplateArgumentListInfo *TAI = new (Mem) ASTTemplateArgumentListInfo();
526 TAI->initializeFrom(List);
530 void ASTTemplateArgumentListInfo::initializeFrom(
531 const TemplateArgumentListInfo &Info) {
532 LAngleLoc = Info.getLAngleLoc();
533 RAngleLoc = Info.getRAngleLoc();
534 NumTemplateArgs = Info.size();
536 TemplateArgumentLoc *ArgBuffer = getTemplateArgs();
537 for (unsigned i = 0; i != NumTemplateArgs; ++i)
538 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]);
541 void ASTTemplateArgumentListInfo::initializeFrom(
542 const TemplateArgumentListInfo &Info,
544 bool &InstantiationDependent,
545 bool &ContainsUnexpandedParameterPack) {
546 LAngleLoc = Info.getLAngleLoc();
547 RAngleLoc = Info.getRAngleLoc();
548 NumTemplateArgs = Info.size();
550 TemplateArgumentLoc *ArgBuffer = getTemplateArgs();
551 for (unsigned i = 0; i != NumTemplateArgs; ++i) {
552 Dependent = Dependent || Info[i].getArgument().isDependent();
553 InstantiationDependent = InstantiationDependent ||
554 Info[i].getArgument().isInstantiationDependent();
555 ContainsUnexpandedParameterPack
556 = ContainsUnexpandedParameterPack ||
557 Info[i].getArgument().containsUnexpandedParameterPack();
559 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]);
563 void ASTTemplateArgumentListInfo::copyInto(
564 TemplateArgumentListInfo &Info) const {
565 Info.setLAngleLoc(LAngleLoc);
566 Info.setRAngleLoc(RAngleLoc);
567 for (unsigned I = 0; I != NumTemplateArgs; ++I)
568 Info.addArgument(getTemplateArgs()[I]);
571 std::size_t ASTTemplateArgumentListInfo::sizeFor(unsigned NumTemplateArgs) {
572 return sizeof(ASTTemplateArgumentListInfo) +
573 sizeof(TemplateArgumentLoc) * NumTemplateArgs;
577 ASTTemplateKWAndArgsInfo::initializeFrom(SourceLocation TemplateKWLoc,
578 const TemplateArgumentListInfo &Info) {
579 Base::initializeFrom(Info);
580 setTemplateKeywordLoc(TemplateKWLoc);
584 ASTTemplateKWAndArgsInfo
585 ::initializeFrom(SourceLocation TemplateKWLoc,
586 const TemplateArgumentListInfo &Info,
588 bool &InstantiationDependent,
589 bool &ContainsUnexpandedParameterPack) {
590 Base::initializeFrom(Info, Dependent, InstantiationDependent,
591 ContainsUnexpandedParameterPack);
592 setTemplateKeywordLoc(TemplateKWLoc);
596 ASTTemplateKWAndArgsInfo::initializeFrom(SourceLocation TemplateKWLoc) {
597 // No explicit template arguments, but template keyword loc is valid.
598 assert(TemplateKWLoc.isValid());
599 LAngleLoc = SourceLocation();
600 RAngleLoc = SourceLocation();
602 setTemplateKeywordLoc(TemplateKWLoc);
606 ASTTemplateKWAndArgsInfo::sizeFor(unsigned NumTemplateArgs) {
607 // Add space for the template keyword location.
608 // FIXME: There's room for this in the padding before the template args in
610 return Base::sizeFor(NumTemplateArgs) + sizeof(SourceLocation);