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"
28 using namespace clang;
30 /// \brief Print a template integral argument value.
32 /// \param TemplArg the TemplateArgument instance to print.
34 /// \param Out the raw_ostream instance to use for printing.
35 static void printIntegral(const TemplateArgument &TemplArg,
37 const ::clang::Type *T = TemplArg.getIntegralType().getTypePtr();
38 const llvm::APSInt *Val = TemplArg.getAsIntegral();
40 if (T->isBooleanType()) {
41 Out << (Val->getBoolValue() ? "true" : "false");
42 } else if (T->isCharType()) {
43 const unsigned char Ch = Val->getZExtValue();
44 const std::string Str(1, Ch);
45 Out << ((Ch == '\'') ? "'\\" : "'");
46 Out.write_escaped(Str, /*UseHexEscapes=*/ true);
49 Out << Val->toString(10);
53 //===----------------------------------------------------------------------===//
54 // TemplateArgument Implementation
55 //===----------------------------------------------------------------------===//
57 TemplateArgument TemplateArgument::CreatePackCopy(ASTContext &Context,
58 const TemplateArgument *Args,
61 return TemplateArgument(0, 0);
63 TemplateArgument *Storage = new (Context) TemplateArgument [NumArgs];
64 std::copy(Args, Args + NumArgs, Storage);
65 return TemplateArgument(Storage, NumArgs);
68 bool TemplateArgument::isDependent() const {
71 llvm_unreachable("Should not have a NULL template argument");
74 return getAsType()->isDependentType();
77 return getAsTemplate().isDependent();
79 case TemplateExpansion:
83 if (DeclContext *DC = dyn_cast<DeclContext>(getAsDecl()))
84 return DC->isDependentContext();
85 return getAsDecl()->getDeclContext()->isDependentContext();
92 return (getAsExpr()->isTypeDependent() || getAsExpr()->isValueDependent());
95 for (pack_iterator P = pack_begin(), PEnd = pack_end(); P != PEnd; ++P) {
106 bool TemplateArgument::isInstantiationDependent() const {
109 llvm_unreachable("Should not have a NULL template argument");
112 return getAsType()->isInstantiationDependentType();
115 return getAsTemplate().isInstantiationDependent();
117 case TemplateExpansion:
121 if (DeclContext *DC = dyn_cast<DeclContext>(getAsDecl()))
122 return DC->isDependentContext();
123 return getAsDecl()->getDeclContext()->isDependentContext();
130 return getAsExpr()->isInstantiationDependent();
133 for (pack_iterator P = pack_begin(), PEnd = pack_end(); P != PEnd; ++P) {
134 if (P->isInstantiationDependent())
144 bool TemplateArgument::isPackExpansion() const {
153 case TemplateExpansion:
157 return isa<PackExpansionType>(getAsType());
160 return isa<PackExpansionExpr>(getAsExpr());
166 bool TemplateArgument::containsUnexpandedParameterPack() const {
171 case TemplateExpansion:
175 if (getAsType()->containsUnexpandedParameterPack())
180 if (getAsTemplate().containsUnexpandedParameterPack())
185 if (getAsExpr()->containsUnexpandedParameterPack())
190 for (pack_iterator P = pack_begin(), PEnd = pack_end(); P != PEnd; ++P)
191 if (P->containsUnexpandedParameterPack())
200 llvm::Optional<unsigned> TemplateArgument::getNumTemplateExpansions() const {
201 assert(Kind == TemplateExpansion);
202 if (TemplateArg.NumExpansions)
203 return TemplateArg.NumExpansions - 1;
205 return llvm::Optional<unsigned>();
208 void TemplateArgument::Profile(llvm::FoldingSetNodeID &ID,
209 const ASTContext &Context) const {
216 getAsType().Profile(ID);
220 ID.AddPointer(getAsDecl()? getAsDecl()->getCanonicalDecl() : 0);
224 case TemplateExpansion: {
225 TemplateName Template = getAsTemplateOrTemplatePattern();
226 if (TemplateTemplateParmDecl *TTP
227 = dyn_cast_or_null<TemplateTemplateParmDecl>(
228 Template.getAsTemplateDecl())) {
230 ID.AddInteger(TTP->getDepth());
231 ID.AddInteger(TTP->getPosition());
232 ID.AddBoolean(TTP->isParameterPack());
234 ID.AddBoolean(false);
235 ID.AddPointer(Context.getCanonicalTemplateName(Template)
236 .getAsVoidPointer());
242 getAsIntegral()->Profile(ID);
243 getIntegralType().Profile(ID);
247 getAsExpr()->Profile(ID, Context, true);
251 ID.AddInteger(Args.NumArgs);
252 for (unsigned I = 0; I != Args.NumArgs; ++I)
253 Args.Args[I].Profile(ID, Context);
257 bool TemplateArgument::structurallyEquals(const TemplateArgument &Other) const {
258 if (getKind() != Other.getKind()) return false;
266 case TemplateExpansion:
267 return TypeOrValue == Other.TypeOrValue;
270 return getIntegralType() == Other.getIntegralType() &&
271 *getAsIntegral() == *Other.getAsIntegral();
274 if (Args.NumArgs != Other.Args.NumArgs) return false;
275 for (unsigned I = 0, E = Args.NumArgs; I != E; ++I)
276 if (!Args.Args[I].structurallyEquals(Other.Args.Args[I]))
281 // Suppress warnings.
285 TemplateArgument TemplateArgument::getPackExpansionPattern() const {
286 assert(isPackExpansion());
290 return getAsType()->getAs<PackExpansionType>()->getPattern();
293 return cast<PackExpansionExpr>(getAsExpr())->getPattern();
295 case TemplateExpansion:
296 return TemplateArgument(getAsTemplateOrTemplatePattern());
303 return TemplateArgument();
306 return TemplateArgument();
309 void TemplateArgument::print(const PrintingPolicy &Policy,
310 raw_ostream &Out) const {
317 PrintingPolicy SubPolicy(Policy);
318 SubPolicy.SuppressStrongLifetime = true;
320 getAsType().getAsStringInternal(TypeStr, SubPolicy);
327 if (NamedDecl *ND = dyn_cast_or_null<NamedDecl>(getAsDecl())) {
328 if (ND->getDeclName()) {
330 Out << ND->getNameAsString();
335 Out << "<anonymous>";
341 getAsTemplate().print(Out, Policy);
344 case TemplateExpansion:
345 getAsTemplateOrTemplatePattern().print(Out, Policy);
350 printIntegral(*this, Out);
355 getAsExpr()->printPretty(Out, 0, Policy);
361 for (TemplateArgument::pack_iterator P = pack_begin(), PEnd = pack_end();
368 P->print(Policy, Out);
375 //===----------------------------------------------------------------------===//
376 // TemplateArgumentLoc Implementation
377 //===----------------------------------------------------------------------===//
379 TemplateArgumentLocInfo::TemplateArgumentLocInfo() {
380 memset((void*)this, 0, sizeof(TemplateArgumentLocInfo));
383 SourceRange TemplateArgumentLoc::getSourceRange() const {
384 switch (Argument.getKind()) {
385 case TemplateArgument::Expression:
386 return getSourceExpression()->getSourceRange();
388 case TemplateArgument::Declaration:
389 return getSourceDeclExpression()->getSourceRange();
391 case TemplateArgument::Type:
392 if (TypeSourceInfo *TSI = getTypeSourceInfo())
393 return TSI->getTypeLoc().getSourceRange();
395 return SourceRange();
397 case TemplateArgument::Template:
398 if (getTemplateQualifierLoc())
399 return SourceRange(getTemplateQualifierLoc().getBeginLoc(),
400 getTemplateNameLoc());
401 return SourceRange(getTemplateNameLoc());
403 case TemplateArgument::TemplateExpansion:
404 if (getTemplateQualifierLoc())
405 return SourceRange(getTemplateQualifierLoc().getBeginLoc(),
406 getTemplateEllipsisLoc());
407 return SourceRange(getTemplateNameLoc(), getTemplateEllipsisLoc());
409 case TemplateArgument::Integral:
410 case TemplateArgument::Pack:
411 case TemplateArgument::Null:
412 return SourceRange();
415 // Silence bonus gcc warning.
416 return SourceRange();
420 TemplateArgumentLoc::getPackExpansionPattern(SourceLocation &Ellipsis,
421 llvm::Optional<unsigned> &NumExpansions,
422 ASTContext &Context) const {
423 assert(Argument.isPackExpansion());
425 switch (Argument.getKind()) {
426 case TemplateArgument::Type: {
427 // FIXME: We shouldn't ever have to worry about missing
429 TypeSourceInfo *ExpansionTSInfo = getTypeSourceInfo();
430 if (!ExpansionTSInfo)
431 ExpansionTSInfo = Context.getTrivialTypeSourceInfo(
432 getArgument().getAsType(),
434 PackExpansionTypeLoc Expansion
435 = cast<PackExpansionTypeLoc>(ExpansionTSInfo->getTypeLoc());
436 Ellipsis = Expansion.getEllipsisLoc();
438 TypeLoc Pattern = Expansion.getPatternLoc();
439 NumExpansions = Expansion.getTypePtr()->getNumExpansions();
441 // FIXME: This is horrible. We know where the source location data is for
442 // the pattern, and we have the pattern's type, but we are forced to copy
443 // them into an ASTContext because TypeSourceInfo bundles them together
444 // and TemplateArgumentLoc traffics in TypeSourceInfo pointers.
445 TypeSourceInfo *PatternTSInfo
446 = Context.CreateTypeSourceInfo(Pattern.getType(),
447 Pattern.getFullDataSize());
448 memcpy(PatternTSInfo->getTypeLoc().getOpaqueData(),
449 Pattern.getOpaqueData(), Pattern.getFullDataSize());
450 return TemplateArgumentLoc(TemplateArgument(Pattern.getType()),
454 case TemplateArgument::Expression: {
455 PackExpansionExpr *Expansion
456 = cast<PackExpansionExpr>(Argument.getAsExpr());
457 Expr *Pattern = Expansion->getPattern();
458 Ellipsis = Expansion->getEllipsisLoc();
459 NumExpansions = Expansion->getNumExpansions();
460 return TemplateArgumentLoc(Pattern, Pattern);
463 case TemplateArgument::TemplateExpansion:
464 Ellipsis = getTemplateEllipsisLoc();
465 NumExpansions = Argument.getNumTemplateExpansions();
466 return TemplateArgumentLoc(Argument.getPackExpansionPattern(),
467 getTemplateQualifierLoc(),
468 getTemplateNameLoc());
470 case TemplateArgument::Declaration:
471 case TemplateArgument::Template:
472 case TemplateArgument::Integral:
473 case TemplateArgument::Pack:
474 case TemplateArgument::Null:
475 return TemplateArgumentLoc();
478 return TemplateArgumentLoc();
481 const DiagnosticBuilder &clang::operator<<(const DiagnosticBuilder &DB,
482 const TemplateArgument &Arg) {
483 switch (Arg.getKind()) {
484 case TemplateArgument::Null:
485 // This is bad, but not as bad as crashing because of argument
487 return DB << "(null template argument)";
489 case TemplateArgument::Type:
490 return DB << Arg.getAsType();
492 case TemplateArgument::Declaration:
493 return DB << Arg.getAsDecl();
495 case TemplateArgument::Integral:
496 return DB << Arg.getAsIntegral()->toString(10);
498 case TemplateArgument::Template:
499 return DB << Arg.getAsTemplate();
501 case TemplateArgument::TemplateExpansion:
502 return DB << Arg.getAsTemplateOrTemplatePattern() << "...";
504 case TemplateArgument::Expression: {
505 // This shouldn't actually ever happen, so it's okay that we're
506 // regurgitating an expression here.
507 // FIXME: We're guessing at LangOptions!
508 llvm::SmallString<32> Str;
509 llvm::raw_svector_ostream OS(Str);
510 LangOptions LangOpts;
511 LangOpts.CPlusPlus = true;
512 PrintingPolicy Policy(LangOpts);
513 Arg.getAsExpr()->printPretty(OS, 0, Policy);
514 return DB << OS.str();
517 case TemplateArgument::Pack: {
518 // FIXME: We're guessing at LangOptions!
519 llvm::SmallString<32> Str;
520 llvm::raw_svector_ostream OS(Str);
521 LangOptions LangOpts;
522 LangOpts.CPlusPlus = true;
523 PrintingPolicy Policy(LangOpts);
524 Arg.print(Policy, OS);
525 return DB << OS.str();
532 const ASTTemplateArgumentListInfo *
533 ASTTemplateArgumentListInfo::Create(ASTContext &C,
534 const TemplateArgumentListInfo &List) {
535 std::size_t size = sizeof(CXXDependentScopeMemberExpr) +
536 ASTTemplateArgumentListInfo::sizeFor(List);
537 void *Mem = C.Allocate(size, llvm::alignOf<ASTTemplateArgumentListInfo>());
538 ASTTemplateArgumentListInfo *TAI = new (Mem) ASTTemplateArgumentListInfo();
539 TAI->initializeFrom(List);
543 void ASTTemplateArgumentListInfo::initializeFrom(
544 const TemplateArgumentListInfo &Info) {
545 LAngleLoc = Info.getLAngleLoc();
546 RAngleLoc = Info.getRAngleLoc();
547 NumTemplateArgs = Info.size();
549 TemplateArgumentLoc *ArgBuffer = getTemplateArgs();
550 for (unsigned i = 0; i != NumTemplateArgs; ++i)
551 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]);
554 void ASTTemplateArgumentListInfo::initializeFrom(
555 const TemplateArgumentListInfo &Info,
557 bool &InstantiationDependent,
558 bool &ContainsUnexpandedParameterPack) {
559 LAngleLoc = Info.getLAngleLoc();
560 RAngleLoc = Info.getRAngleLoc();
561 NumTemplateArgs = Info.size();
563 TemplateArgumentLoc *ArgBuffer = getTemplateArgs();
564 for (unsigned i = 0; i != NumTemplateArgs; ++i) {
565 Dependent = Dependent || Info[i].getArgument().isDependent();
566 InstantiationDependent = InstantiationDependent ||
567 Info[i].getArgument().isInstantiationDependent();
568 ContainsUnexpandedParameterPack
569 = ContainsUnexpandedParameterPack ||
570 Info[i].getArgument().containsUnexpandedParameterPack();
572 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]);
576 void ASTTemplateArgumentListInfo::copyInto(
577 TemplateArgumentListInfo &Info) const {
578 Info.setLAngleLoc(LAngleLoc);
579 Info.setRAngleLoc(RAngleLoc);
580 for (unsigned I = 0; I != NumTemplateArgs; ++I)
581 Info.addArgument(getTemplateArgs()[I]);
584 std::size_t ASTTemplateArgumentListInfo::sizeFor(unsigned NumTemplateArgs) {
585 return sizeof(ASTTemplateArgumentListInfo) +
586 sizeof(TemplateArgumentLoc) * NumTemplateArgs;
589 std::size_t ASTTemplateArgumentListInfo::sizeFor(
590 const TemplateArgumentListInfo &Info) {
591 return sizeFor(Info.size());