1 //===--- ASTDiagnostic.cpp - Diagnostic Printing Hooks for AST Nodes ------===//
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 a diagnostic formatting hook for AST elements.
12 //===----------------------------------------------------------------------===//
14 #include "clang/AST/ASTDiagnostic.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/ASTLambda.h"
17 #include "clang/AST/Attr.h"
18 #include "clang/AST/DeclObjC.h"
19 #include "clang/AST/DeclTemplate.h"
20 #include "clang/AST/ExprCXX.h"
21 #include "clang/AST/TemplateBase.h"
22 #include "clang/AST/Type.h"
23 #include "llvm/ADT/SmallString.h"
24 #include "llvm/Support/raw_ostream.h"
26 using namespace clang;
28 // Returns a desugared version of the QualType, and marks ShouldAKA as true
29 // whenever we remove significant sugar from the type.
30 static QualType Desugar(ASTContext &Context, QualType QT, bool &ShouldAKA) {
31 QualifierCollector QC;
34 const Type *Ty = QC.strip(QT);
36 // Don't aka just because we saw an elaborated type...
37 if (const ElaboratedType *ET = dyn_cast<ElaboratedType>(Ty)) {
41 // ... or a paren type ...
42 if (const ParenType *PT = dyn_cast<ParenType>(Ty)) {
46 // ...or a substituted template type parameter ...
47 if (const SubstTemplateTypeParmType *ST =
48 dyn_cast<SubstTemplateTypeParmType>(Ty)) {
52 // ...or an attributed type...
53 if (const AttributedType *AT = dyn_cast<AttributedType>(Ty)) {
57 // ...or an adjusted type...
58 if (const AdjustedType *AT = dyn_cast<AdjustedType>(Ty)) {
62 // ... or an auto type.
63 if (const AutoType *AT = dyn_cast<AutoType>(Ty)) {
70 // Desugar FunctionType if return type or any parameter type should be
71 // desugared. Preserve nullability attribute on desugared types.
72 if (const FunctionType *FT = dyn_cast<FunctionType>(Ty)) {
73 bool DesugarReturn = false;
74 QualType SugarRT = FT->getReturnType();
75 QualType RT = Desugar(Context, SugarRT, DesugarReturn);
76 if (auto nullability = AttributedType::stripOuterNullability(SugarRT)) {
77 RT = Context.getAttributedType(
78 AttributedType::getNullabilityAttrKind(*nullability), RT, RT);
81 bool DesugarArgument = false;
82 SmallVector<QualType, 4> Args;
83 const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FT);
85 for (QualType SugarPT : FPT->param_types()) {
86 QualType PT = Desugar(Context, SugarPT, DesugarArgument);
87 if (auto nullability =
88 AttributedType::stripOuterNullability(SugarPT)) {
89 PT = Context.getAttributedType(
90 AttributedType::getNullabilityAttrKind(*nullability), PT, PT);
96 if (DesugarReturn || DesugarArgument) {
98 QT = FPT ? Context.getFunctionType(RT, Args, FPT->getExtProtoInfo())
99 : Context.getFunctionNoProtoType(RT, FT->getExtInfo());
104 // Desugar template specializations if any template argument should be
106 if (const TemplateSpecializationType *TST =
107 dyn_cast<TemplateSpecializationType>(Ty)) {
108 if (!TST->isTypeAlias()) {
109 bool DesugarArgument = false;
110 SmallVector<TemplateArgument, 4> Args;
111 for (unsigned I = 0, N = TST->getNumArgs(); I != N; ++I) {
112 const TemplateArgument &Arg = TST->getArg(I);
113 if (Arg.getKind() == TemplateArgument::Type)
114 Args.push_back(Desugar(Context, Arg.getAsType(), DesugarArgument));
119 if (DesugarArgument) {
121 QT = Context.getTemplateSpecializationType(
122 TST->getTemplateName(), Args, QT);
128 // Don't desugar magic Objective-C types.
129 if (QualType(Ty,0) == Context.getObjCIdType() ||
130 QualType(Ty,0) == Context.getObjCClassType() ||
131 QualType(Ty,0) == Context.getObjCSelType() ||
132 QualType(Ty,0) == Context.getObjCProtoType())
135 // Don't desugar va_list.
136 if (QualType(Ty, 0) == Context.getBuiltinVaListType() ||
137 QualType(Ty, 0) == Context.getBuiltinMSVaListType())
140 // Otherwise, do a single-step desugar.
142 bool IsSugar = false;
143 switch (Ty->getTypeClass()) {
144 #define ABSTRACT_TYPE(Class, Base)
145 #define TYPE(Class, Base) \
146 case Type::Class: { \
147 const Class##Type *CTy = cast<Class##Type>(Ty); \
148 if (CTy->isSugared()) { \
150 Underlying = CTy->desugar(); \
154 #include "clang/AST/TypeNodes.def"
157 // If it wasn't sugared, we're done.
161 // If the desugared type is a vector type, we don't want to expand
162 // it, it will turn into an attribute mess. People want their "vec4".
163 if (isa<VectorType>(Underlying))
166 // Don't desugar through the primary typedef of an anonymous type.
167 if (const TagType *UTT = Underlying->getAs<TagType>())
168 if (const TypedefType *QTT = dyn_cast<TypedefType>(QT))
169 if (UTT->getDecl()->getTypedefNameForAnonDecl() == QTT->getDecl())
172 // Record that we actually looked through an opaque type here.
177 // If we have a pointer-like type, desugar the pointee as well.
178 // FIXME: Handle other pointer-like types.
179 if (const PointerType *Ty = QT->getAs<PointerType>()) {
180 QT = Context.getPointerType(Desugar(Context, Ty->getPointeeType(),
182 } else if (const auto *Ty = QT->getAs<ObjCObjectPointerType>()) {
183 QT = Context.getObjCObjectPointerType(Desugar(Context, Ty->getPointeeType(),
185 } else if (const LValueReferenceType *Ty = QT->getAs<LValueReferenceType>()) {
186 QT = Context.getLValueReferenceType(Desugar(Context, Ty->getPointeeType(),
188 } else if (const RValueReferenceType *Ty = QT->getAs<RValueReferenceType>()) {
189 QT = Context.getRValueReferenceType(Desugar(Context, Ty->getPointeeType(),
191 } else if (const auto *Ty = QT->getAs<ObjCObjectType>()) {
192 if (Ty->getBaseType().getTypePtr() != Ty && !ShouldAKA) {
193 QualType BaseType = Desugar(Context, Ty->getBaseType(), ShouldAKA);
194 QT = Context.getObjCObjectType(BaseType, Ty->getTypeArgsAsWritten(),
195 llvm::makeArrayRef(Ty->qual_begin(),
196 Ty->getNumProtocols()),
197 Ty->isKindOfTypeAsWritten());
201 return QC.apply(Context, QT);
204 /// \brief Convert the given type to a string suitable for printing as part of
207 /// There are four main criteria when determining whether we should have an
208 /// a.k.a. clause when pretty-printing a type:
210 /// 1) Some types provide very minimal sugar that doesn't impede the
211 /// user's understanding --- for example, elaborated type
212 /// specifiers. If this is all the sugar we see, we don't want an
214 /// 2) Some types are technically sugared but are much more familiar
215 /// when seen in their sugared form --- for example, va_list,
216 /// vector types, and the magic Objective C types. We don't
217 /// want to desugar these, even if we do produce an a.k.a. clause.
218 /// 3) Some types may have already been desugared previously in this diagnostic.
219 /// if this is the case, doing another "aka" would just be clutter.
220 /// 4) Two different types within the same diagnostic have the same output
221 /// string. In this case, force an a.k.a with the desugared type when
222 /// doing so will provide additional information.
224 /// \param Context the context in which the type was allocated
225 /// \param Ty the type to print
226 /// \param QualTypeVals pointer values to QualTypes which are used in the
227 /// diagnostic message
229 ConvertTypeToDiagnosticString(ASTContext &Context, QualType Ty,
230 ArrayRef<DiagnosticsEngine::ArgumentValue> PrevArgs,
231 ArrayRef<intptr_t> QualTypeVals) {
232 // FIXME: Playing with std::string is really slow.
233 bool ForceAKA = false;
234 QualType CanTy = Ty.getCanonicalType();
235 std::string S = Ty.getAsString(Context.getPrintingPolicy());
236 std::string CanS = CanTy.getAsString(Context.getPrintingPolicy());
238 for (unsigned I = 0, E = QualTypeVals.size(); I != E; ++I) {
240 QualType::getFromOpaquePtr(reinterpret_cast<void*>(QualTypeVals[I]));
241 if (CompareTy.isNull())
244 continue; // Same types
245 QualType CompareCanTy = CompareTy.getCanonicalType();
246 if (CompareCanTy == CanTy)
247 continue; // Same canonical types
248 std::string CompareS = CompareTy.getAsString(Context.getPrintingPolicy());
249 bool ShouldAKA = false;
250 QualType CompareDesugar = Desugar(Context, CompareTy, ShouldAKA);
251 std::string CompareDesugarStr =
252 CompareDesugar.getAsString(Context.getPrintingPolicy());
253 if (CompareS != S && CompareDesugarStr != S)
254 continue; // The type string is different than the comparison string
255 // and the desugared comparison string.
256 std::string CompareCanS =
257 CompareCanTy.getAsString(Context.getPrintingPolicy());
259 if (CompareCanS == CanS)
260 continue; // No new info from canonical type
266 // Check to see if we already desugared this type in this
267 // diagnostic. If so, don't do it again.
268 bool Repeated = false;
269 for (unsigned i = 0, e = PrevArgs.size(); i != e; ++i) {
270 // TODO: Handle ak_declcontext case.
271 if (PrevArgs[i].first == DiagnosticsEngine::ak_qualtype) {
272 void *Ptr = (void*)PrevArgs[i].second;
273 QualType PrevTy(QualType::getFromOpaquePtr(Ptr));
281 // Consider producing an a.k.a. clause if removing all the direct
282 // sugar gives us something "significantly different".
284 bool ShouldAKA = false;
285 QualType DesugaredTy = Desugar(Context, Ty, ShouldAKA);
286 if (ShouldAKA || ForceAKA) {
287 if (DesugaredTy == Ty) {
288 DesugaredTy = Ty.getCanonicalType();
290 std::string akaStr = DesugaredTy.getAsString(Context.getPrintingPolicy());
292 S = "'" + S + "' (aka '" + akaStr + "')";
297 // Give some additional info on vector types. These are either not desugared
298 // or displaying complex __attribute__ expressions so add details of the
299 // type and element count.
300 if (Ty->isVectorType()) {
301 const VectorType *VTy = Ty->getAs<VectorType>();
302 std::string DecoratedString;
303 llvm::raw_string_ostream OS(DecoratedString);
304 const char *Values = VTy->getNumElements() > 1 ? "values" : "value";
305 OS << "'" << S << "' (vector of " << VTy->getNumElements() << " '"
306 << VTy->getElementType().getAsString(Context.getPrintingPolicy())
307 << "' " << Values << ")";
316 static bool FormatTemplateTypeDiff(ASTContext &Context, QualType FromType,
317 QualType ToType, bool PrintTree,
318 bool PrintFromType, bool ElideType,
319 bool ShowColors, raw_ostream &OS);
321 void clang::FormatASTNodeDiagnosticArgument(
322 DiagnosticsEngine::ArgumentKind Kind,
326 ArrayRef<DiagnosticsEngine::ArgumentValue> PrevArgs,
327 SmallVectorImpl<char> &Output,
329 ArrayRef<intptr_t> QualTypeVals) {
330 ASTContext &Context = *static_cast<ASTContext*>(Cookie);
332 size_t OldEnd = Output.size();
333 llvm::raw_svector_ostream OS(Output);
334 bool NeedQuotes = true;
337 default: llvm_unreachable("unknown ArgumentKind");
338 case DiagnosticsEngine::ak_qualtype_pair: {
339 TemplateDiffTypes &TDT = *reinterpret_cast<TemplateDiffTypes*>(Val);
341 QualType::getFromOpaquePtr(reinterpret_cast<void*>(TDT.FromType));
343 QualType::getFromOpaquePtr(reinterpret_cast<void*>(TDT.ToType));
345 if (FormatTemplateTypeDiff(Context, FromType, ToType, TDT.PrintTree,
346 TDT.PrintFromType, TDT.ElideType,
347 TDT.ShowColors, OS)) {
348 NeedQuotes = !TDT.PrintTree;
349 TDT.TemplateDiffUsed = true;
353 // Don't fall-back during tree printing. The caller will handle
358 // Attempting to do a template diff on non-templates. Set the variables
359 // and continue with regular type printing of the appropriate type.
360 Val = TDT.PrintFromType ? TDT.FromType : TDT.ToType;
361 Modifier = StringRef();
362 Argument = StringRef();
365 case DiagnosticsEngine::ak_qualtype: {
366 assert(Modifier.empty() && Argument.empty() &&
367 "Invalid modifier for QualType argument");
369 QualType Ty(QualType::getFromOpaquePtr(reinterpret_cast<void*>(Val)));
370 OS << ConvertTypeToDiagnosticString(Context, Ty, PrevArgs, QualTypeVals);
374 case DiagnosticsEngine::ak_declarationname: {
375 if (Modifier == "objcclass" && Argument.empty())
377 else if (Modifier == "objcinstance" && Argument.empty())
380 assert(Modifier.empty() && Argument.empty() &&
381 "Invalid modifier for DeclarationName argument");
383 OS << DeclarationName::getFromOpaqueInteger(Val);
386 case DiagnosticsEngine::ak_nameddecl: {
388 if (Modifier == "q" && Argument.empty())
391 assert(Modifier.empty() && Argument.empty() &&
392 "Invalid modifier for NamedDecl* argument");
395 const NamedDecl *ND = reinterpret_cast<const NamedDecl*>(Val);
396 ND->getNameForDiagnostic(OS, Context.getPrintingPolicy(), Qualified);
399 case DiagnosticsEngine::ak_nestednamespec: {
400 NestedNameSpecifier *NNS = reinterpret_cast<NestedNameSpecifier*>(Val);
401 NNS->print(OS, Context.getPrintingPolicy());
405 case DiagnosticsEngine::ak_declcontext: {
406 DeclContext *DC = reinterpret_cast<DeclContext *> (Val);
407 assert(DC && "Should never have a null declaration context");
410 // FIXME: Get the strings for DeclContext from some localized place
411 if (DC->isTranslationUnit()) {
412 if (Context.getLangOpts().CPlusPlus)
413 OS << "the global namespace";
415 OS << "the global scope";
416 } else if (DC->isClosure()) {
417 OS << "block literal";
418 } else if (isLambdaCallOperator(DC)) {
419 OS << "lambda expression";
420 } else if (TypeDecl *Type = dyn_cast<TypeDecl>(DC)) {
421 OS << ConvertTypeToDiagnosticString(Context,
422 Context.getTypeDeclType(Type),
423 PrevArgs, QualTypeVals);
425 assert(isa<NamedDecl>(DC) && "Expected a NamedDecl");
426 NamedDecl *ND = cast<NamedDecl>(DC);
427 if (isa<NamespaceDecl>(ND))
429 else if (isa<ObjCMethodDecl>(ND))
431 else if (isa<FunctionDecl>(ND))
435 ND->getNameForDiagnostic(OS, Context.getPrintingPolicy(), true);
440 case DiagnosticsEngine::ak_attr: {
441 const Attr *At = reinterpret_cast<Attr *>(Val);
442 assert(At && "Received null Attr object!");
443 OS << '\'' << At->getSpelling() << '\'';
450 Output.insert(Output.begin()+OldEnd, '\'');
451 Output.push_back('\'');
455 /// TemplateDiff - A class that constructs a pretty string for a pair of
456 /// QualTypes. For the pair of types, a diff tree will be created containing
457 /// all the information about the templates and template arguments. Afterwards,
458 /// the tree is transformed to a string according to the options passed in.
461 /// Context - The ASTContext which is used for comparing template arguments.
464 /// Policy - Used during expression printing.
465 PrintingPolicy Policy;
467 /// ElideType - Option to elide identical types.
470 /// PrintTree - Format output string as a tree.
473 /// ShowColor - Diagnostics support color, so bolding will be used.
476 /// FromTemplateType - When single type printing is selected, this is the
477 /// type to be be printed. When tree printing is selected, this type will
478 /// show up first in the tree.
479 QualType FromTemplateType;
481 /// ToTemplateType - The type that FromType is compared to. Only in tree
482 /// printing will this type be outputed.
483 QualType ToTemplateType;
485 /// OS - The stream used to construct the output strings.
488 /// IsBold - Keeps track of the bold formatting for the output string.
491 /// DiffTree - A tree representation the differences between two types.
494 /// DiffKind - The difference in a DiffNode. Fields of
495 /// TemplateArgumentInfo needed by each difference can be found in the
496 /// Set* and Get* functions.
498 /// Incomplete or invalid node.
500 /// Another level of templates
502 /// Type difference, all type differences except those falling under
503 /// the Template difference.
505 /// Expression difference, this is only when both arguments are
506 /// expressions. If one argument is an expression and the other is
507 /// Integer or Declaration, then use that diff type instead.
509 /// Template argument difference
511 /// Integer difference
513 /// Declaration difference, nullptr arguments are included here
515 /// One argument being integer and the other being declaration
516 FromIntegerAndToDeclaration,
517 FromDeclarationAndToInteger
521 /// TemplateArgumentInfo - All the information needed to pretty print
522 /// a template argument. See the Set* and Get* functions to see which
523 /// fields are used for each DiffKind.
524 struct TemplateArgumentInfo {
528 bool IsValidInt = false;
529 Expr *ArgExpr = nullptr;
530 TemplateDecl *TD = nullptr;
531 ValueDecl *VD = nullptr;
532 bool NeedAddressOf = false;
533 bool IsNullPtr = false;
534 bool IsDefault = false;
537 /// DiffNode - The root node stores the original type. Each child node
538 /// stores template arguments of their parents. For templated types, the
539 /// template decl is also stored.
541 DiffKind Kind = Invalid;
543 /// NextNode - The index of the next sibling node or 0.
544 unsigned NextNode = 0;
546 /// ChildNode - The index of the first child node or 0.
547 unsigned ChildNode = 0;
549 /// ParentNode - The index of the parent node.
550 unsigned ParentNode = 0;
552 TemplateArgumentInfo FromArgInfo, ToArgInfo;
554 /// Same - Whether the two arguments evaluate to the same value.
557 DiffNode(unsigned ParentNode = 0) : ParentNode(ParentNode) {}
560 /// FlatTree - A flattened tree used to store the DiffNodes.
561 SmallVector<DiffNode, 16> FlatTree;
563 /// CurrentNode - The index of the current node being used.
564 unsigned CurrentNode;
566 /// NextFreeNode - The index of the next unused node. Used when creating
568 unsigned NextFreeNode;
570 /// ReadNode - The index of the current node being read.
575 CurrentNode(0), NextFreeNode(1) {
576 FlatTree.push_back(DiffNode());
579 // Node writing functions, one for each valid DiffKind element.
580 void SetTemplateDiff(TemplateDecl *FromTD, TemplateDecl *ToTD,
581 Qualifiers FromQual, Qualifiers ToQual,
582 bool FromDefault, bool ToDefault) {
583 assert(FlatTree[CurrentNode].Kind == Invalid && "Node is not empty.");
584 FlatTree[CurrentNode].Kind = Template;
585 FlatTree[CurrentNode].FromArgInfo.TD = FromTD;
586 FlatTree[CurrentNode].ToArgInfo.TD = ToTD;
587 FlatTree[CurrentNode].FromArgInfo.Qual = FromQual;
588 FlatTree[CurrentNode].ToArgInfo.Qual = ToQual;
589 SetDefault(FromDefault, ToDefault);
592 void SetTypeDiff(QualType FromType, QualType ToType, bool FromDefault,
594 assert(FlatTree[CurrentNode].Kind == Invalid && "Node is not empty.");
595 FlatTree[CurrentNode].Kind = Type;
596 FlatTree[CurrentNode].FromArgInfo.ArgType = FromType;
597 FlatTree[CurrentNode].ToArgInfo.ArgType = ToType;
598 SetDefault(FromDefault, ToDefault);
601 void SetExpressionDiff(Expr *FromExpr, Expr *ToExpr, bool FromDefault,
603 assert(FlatTree[CurrentNode].Kind == Invalid && "Node is not empty.");
604 FlatTree[CurrentNode].Kind = Expression;
605 FlatTree[CurrentNode].FromArgInfo.ArgExpr = FromExpr;
606 FlatTree[CurrentNode].ToArgInfo.ArgExpr = ToExpr;
607 SetDefault(FromDefault, ToDefault);
610 void SetTemplateTemplateDiff(TemplateDecl *FromTD, TemplateDecl *ToTD,
611 bool FromDefault, bool ToDefault) {
612 assert(FlatTree[CurrentNode].Kind == Invalid && "Node is not empty.");
613 FlatTree[CurrentNode].Kind = TemplateTemplate;
614 FlatTree[CurrentNode].FromArgInfo.TD = FromTD;
615 FlatTree[CurrentNode].ToArgInfo.TD = ToTD;
616 SetDefault(FromDefault, ToDefault);
619 void SetIntegerDiff(const llvm::APSInt &FromInt, const llvm::APSInt &ToInt,
620 bool IsValidFromInt, bool IsValidToInt,
621 QualType FromIntType, QualType ToIntType,
622 Expr *FromExpr, Expr *ToExpr, bool FromDefault,
624 assert(FlatTree[CurrentNode].Kind == Invalid && "Node is not empty.");
625 FlatTree[CurrentNode].Kind = Integer;
626 FlatTree[CurrentNode].FromArgInfo.Val = FromInt;
627 FlatTree[CurrentNode].ToArgInfo.Val = ToInt;
628 FlatTree[CurrentNode].FromArgInfo.IsValidInt = IsValidFromInt;
629 FlatTree[CurrentNode].ToArgInfo.IsValidInt = IsValidToInt;
630 FlatTree[CurrentNode].FromArgInfo.ArgType = FromIntType;
631 FlatTree[CurrentNode].ToArgInfo.ArgType = ToIntType;
632 FlatTree[CurrentNode].FromArgInfo.ArgExpr = FromExpr;
633 FlatTree[CurrentNode].ToArgInfo.ArgExpr = ToExpr;
634 SetDefault(FromDefault, ToDefault);
637 void SetDeclarationDiff(ValueDecl *FromValueDecl, ValueDecl *ToValueDecl,
638 bool FromAddressOf, bool ToAddressOf,
639 bool FromNullPtr, bool ToNullPtr, Expr *FromExpr,
640 Expr *ToExpr, bool FromDefault, bool ToDefault) {
641 assert(FlatTree[CurrentNode].Kind == Invalid && "Node is not empty.");
642 FlatTree[CurrentNode].Kind = Declaration;
643 FlatTree[CurrentNode].FromArgInfo.VD = FromValueDecl;
644 FlatTree[CurrentNode].ToArgInfo.VD = ToValueDecl;
645 FlatTree[CurrentNode].FromArgInfo.NeedAddressOf = FromAddressOf;
646 FlatTree[CurrentNode].ToArgInfo.NeedAddressOf = ToAddressOf;
647 FlatTree[CurrentNode].FromArgInfo.IsNullPtr = FromNullPtr;
648 FlatTree[CurrentNode].ToArgInfo.IsNullPtr = ToNullPtr;
649 FlatTree[CurrentNode].FromArgInfo.ArgExpr = FromExpr;
650 FlatTree[CurrentNode].ToArgInfo.ArgExpr = ToExpr;
651 SetDefault(FromDefault, ToDefault);
654 void SetFromDeclarationAndToIntegerDiff(
655 ValueDecl *FromValueDecl, bool FromAddressOf, bool FromNullPtr,
656 Expr *FromExpr, const llvm::APSInt &ToInt, bool IsValidToInt,
657 QualType ToIntType, Expr *ToExpr, bool FromDefault, bool ToDefault) {
658 assert(FlatTree[CurrentNode].Kind == Invalid && "Node is not empty.");
659 FlatTree[CurrentNode].Kind = FromDeclarationAndToInteger;
660 FlatTree[CurrentNode].FromArgInfo.VD = FromValueDecl;
661 FlatTree[CurrentNode].FromArgInfo.NeedAddressOf = FromAddressOf;
662 FlatTree[CurrentNode].FromArgInfo.IsNullPtr = FromNullPtr;
663 FlatTree[CurrentNode].FromArgInfo.ArgExpr = FromExpr;
664 FlatTree[CurrentNode].ToArgInfo.Val = ToInt;
665 FlatTree[CurrentNode].ToArgInfo.IsValidInt = IsValidToInt;
666 FlatTree[CurrentNode].ToArgInfo.ArgType = ToIntType;
667 FlatTree[CurrentNode].ToArgInfo.ArgExpr = ToExpr;
668 SetDefault(FromDefault, ToDefault);
671 void SetFromIntegerAndToDeclarationDiff(
672 const llvm::APSInt &FromInt, bool IsValidFromInt, QualType FromIntType,
673 Expr *FromExpr, ValueDecl *ToValueDecl, bool ToAddressOf,
674 bool ToNullPtr, Expr *ToExpr, bool FromDefault, bool ToDefault) {
675 assert(FlatTree[CurrentNode].Kind == Invalid && "Node is not empty.");
676 FlatTree[CurrentNode].Kind = FromIntegerAndToDeclaration;
677 FlatTree[CurrentNode].FromArgInfo.Val = FromInt;
678 FlatTree[CurrentNode].FromArgInfo.IsValidInt = IsValidFromInt;
679 FlatTree[CurrentNode].FromArgInfo.ArgType = FromIntType;
680 FlatTree[CurrentNode].FromArgInfo.ArgExpr = FromExpr;
681 FlatTree[CurrentNode].ToArgInfo.VD = ToValueDecl;
682 FlatTree[CurrentNode].ToArgInfo.NeedAddressOf = ToAddressOf;
683 FlatTree[CurrentNode].ToArgInfo.IsNullPtr = ToNullPtr;
684 FlatTree[CurrentNode].ToArgInfo.ArgExpr = ToExpr;
685 SetDefault(FromDefault, ToDefault);
688 /// SetDefault - Sets FromDefault and ToDefault flags of the current node.
689 void SetDefault(bool FromDefault, bool ToDefault) {
690 assert((!FromDefault || !ToDefault) && "Both arguments cannot be default.");
691 FlatTree[CurrentNode].FromArgInfo.IsDefault = FromDefault;
692 FlatTree[CurrentNode].ToArgInfo.IsDefault = ToDefault;
695 /// SetSame - Sets the same flag of the current node.
696 void SetSame(bool Same) {
697 FlatTree[CurrentNode].Same = Same;
700 /// SetKind - Sets the current node's type.
701 void SetKind(DiffKind Kind) {
702 FlatTree[CurrentNode].Kind = Kind;
705 /// Up - Changes the node to the parent of the current node.
707 assert(FlatTree[CurrentNode].Kind != Invalid &&
708 "Cannot exit node before setting node information.");
709 CurrentNode = FlatTree[CurrentNode].ParentNode;
712 /// AddNode - Adds a child node to the current node, then sets that node
713 /// node as the current node.
715 assert(FlatTree[CurrentNode].Kind == Template &&
716 "Only Template nodes can have children nodes.");
717 FlatTree.push_back(DiffNode(CurrentNode));
718 DiffNode &Node = FlatTree[CurrentNode];
719 if (Node.ChildNode == 0) {
720 // If a child node doesn't exist, add one.
721 Node.ChildNode = NextFreeNode;
723 // If a child node exists, find the last child node and add a
726 for (i = Node.ChildNode; FlatTree[i].NextNode != 0;
727 i = FlatTree[i].NextNode) {
729 FlatTree[i].NextNode = NextFreeNode;
731 CurrentNode = NextFreeNode;
735 // Node reading functions.
736 /// StartTraverse - Prepares the tree for recursive traversal.
737 void StartTraverse() {
739 CurrentNode = NextFreeNode;
743 /// Parent - Move the current read node to its parent.
745 ReadNode = FlatTree[ReadNode].ParentNode;
748 void GetTemplateDiff(TemplateDecl *&FromTD, TemplateDecl *&ToTD,
749 Qualifiers &FromQual, Qualifiers &ToQual) {
750 assert(FlatTree[ReadNode].Kind == Template && "Unexpected kind.");
751 FromTD = FlatTree[ReadNode].FromArgInfo.TD;
752 ToTD = FlatTree[ReadNode].ToArgInfo.TD;
753 FromQual = FlatTree[ReadNode].FromArgInfo.Qual;
754 ToQual = FlatTree[ReadNode].ToArgInfo.Qual;
757 void GetTypeDiff(QualType &FromType, QualType &ToType) {
758 assert(FlatTree[ReadNode].Kind == Type && "Unexpected kind");
759 FromType = FlatTree[ReadNode].FromArgInfo.ArgType;
760 ToType = FlatTree[ReadNode].ToArgInfo.ArgType;
763 void GetExpressionDiff(Expr *&FromExpr, Expr *&ToExpr) {
764 assert(FlatTree[ReadNode].Kind == Expression && "Unexpected kind");
765 FromExpr = FlatTree[ReadNode].FromArgInfo.ArgExpr;
766 ToExpr = FlatTree[ReadNode].ToArgInfo.ArgExpr;
769 void GetTemplateTemplateDiff(TemplateDecl *&FromTD, TemplateDecl *&ToTD) {
770 assert(FlatTree[ReadNode].Kind == TemplateTemplate && "Unexpected kind.");
771 FromTD = FlatTree[ReadNode].FromArgInfo.TD;
772 ToTD = FlatTree[ReadNode].ToArgInfo.TD;
775 void GetIntegerDiff(llvm::APSInt &FromInt, llvm::APSInt &ToInt,
776 bool &IsValidFromInt, bool &IsValidToInt,
777 QualType &FromIntType, QualType &ToIntType,
778 Expr *&FromExpr, Expr *&ToExpr) {
779 assert(FlatTree[ReadNode].Kind == Integer && "Unexpected kind.");
780 FromInt = FlatTree[ReadNode].FromArgInfo.Val;
781 ToInt = FlatTree[ReadNode].ToArgInfo.Val;
782 IsValidFromInt = FlatTree[ReadNode].FromArgInfo.IsValidInt;
783 IsValidToInt = FlatTree[ReadNode].ToArgInfo.IsValidInt;
784 FromIntType = FlatTree[ReadNode].FromArgInfo.ArgType;
785 ToIntType = FlatTree[ReadNode].ToArgInfo.ArgType;
786 FromExpr = FlatTree[ReadNode].FromArgInfo.ArgExpr;
787 ToExpr = FlatTree[ReadNode].ToArgInfo.ArgExpr;
790 void GetDeclarationDiff(ValueDecl *&FromValueDecl, ValueDecl *&ToValueDecl,
791 bool &FromAddressOf, bool &ToAddressOf,
792 bool &FromNullPtr, bool &ToNullPtr, Expr *&FromExpr,
794 assert(FlatTree[ReadNode].Kind == Declaration && "Unexpected kind.");
795 FromValueDecl = FlatTree[ReadNode].FromArgInfo.VD;
796 ToValueDecl = FlatTree[ReadNode].ToArgInfo.VD;
797 FromAddressOf = FlatTree[ReadNode].FromArgInfo.NeedAddressOf;
798 ToAddressOf = FlatTree[ReadNode].ToArgInfo.NeedAddressOf;
799 FromNullPtr = FlatTree[ReadNode].FromArgInfo.IsNullPtr;
800 ToNullPtr = FlatTree[ReadNode].ToArgInfo.IsNullPtr;
801 FromExpr = FlatTree[ReadNode].FromArgInfo.ArgExpr;
802 ToExpr = FlatTree[ReadNode].ToArgInfo.ArgExpr;
805 void GetFromDeclarationAndToIntegerDiff(
806 ValueDecl *&FromValueDecl, bool &FromAddressOf, bool &FromNullPtr,
807 Expr *&FromExpr, llvm::APSInt &ToInt, bool &IsValidToInt,
808 QualType &ToIntType, Expr *&ToExpr) {
809 assert(FlatTree[ReadNode].Kind == FromDeclarationAndToInteger &&
811 FromValueDecl = FlatTree[ReadNode].FromArgInfo.VD;
812 FromAddressOf = FlatTree[ReadNode].FromArgInfo.NeedAddressOf;
813 FromNullPtr = FlatTree[ReadNode].FromArgInfo.IsNullPtr;
814 FromExpr = FlatTree[ReadNode].FromArgInfo.ArgExpr;
815 ToInt = FlatTree[ReadNode].ToArgInfo.Val;
816 IsValidToInt = FlatTree[ReadNode].ToArgInfo.IsValidInt;
817 ToIntType = FlatTree[ReadNode].ToArgInfo.ArgType;
818 ToExpr = FlatTree[ReadNode].ToArgInfo.ArgExpr;
821 void GetFromIntegerAndToDeclarationDiff(
822 llvm::APSInt &FromInt, bool &IsValidFromInt, QualType &FromIntType,
823 Expr *&FromExpr, ValueDecl *&ToValueDecl, bool &ToAddressOf,
824 bool &ToNullPtr, Expr *&ToExpr) {
825 assert(FlatTree[ReadNode].Kind == FromIntegerAndToDeclaration &&
827 FromInt = FlatTree[ReadNode].FromArgInfo.Val;
828 IsValidFromInt = FlatTree[ReadNode].FromArgInfo.IsValidInt;
829 FromIntType = FlatTree[ReadNode].FromArgInfo.ArgType;
830 FromExpr = FlatTree[ReadNode].FromArgInfo.ArgExpr;
831 ToValueDecl = FlatTree[ReadNode].ToArgInfo.VD;
832 ToAddressOf = FlatTree[ReadNode].ToArgInfo.NeedAddressOf;
833 ToNullPtr = FlatTree[ReadNode].ToArgInfo.IsNullPtr;
834 ToExpr = FlatTree[ReadNode].ToArgInfo.ArgExpr;
837 /// FromDefault - Return true if the from argument is the default.
839 return FlatTree[ReadNode].FromArgInfo.IsDefault;
842 /// ToDefault - Return true if the to argument is the default.
844 return FlatTree[ReadNode].ToArgInfo.IsDefault;
847 /// NodeIsSame - Returns true the arguments are the same.
849 return FlatTree[ReadNode].Same;
852 /// HasChildrend - Returns true if the node has children.
854 return FlatTree[ReadNode].ChildNode != 0;
857 /// MoveToChild - Moves from the current node to its child.
859 ReadNode = FlatTree[ReadNode].ChildNode;
862 /// AdvanceSibling - If there is a next sibling, advance to it and return
863 /// true. Otherwise, return false.
864 bool AdvanceSibling() {
865 if (FlatTree[ReadNode].NextNode == 0)
868 ReadNode = FlatTree[ReadNode].NextNode;
872 /// HasNextSibling - Return true if the node has a next sibling.
873 bool HasNextSibling() {
874 return FlatTree[ReadNode].NextNode != 0;
877 /// Empty - Returns true if the tree has no information.
879 return GetKind() == Invalid;
882 /// GetKind - Returns the current node's type.
884 return FlatTree[ReadNode].Kind;
890 /// TSTiterator - a pair of iterators that walks the
891 /// TemplateSpecializationType and the desugared TemplateSpecializationType.
892 /// The deseguared TemplateArgument should provide the canonical argument
895 typedef const TemplateArgument& reference;
896 typedef const TemplateArgument* pointer;
898 /// InternalIterator - an iterator that is used to enter a
899 /// TemplateSpecializationType and read TemplateArguments inside template
900 /// parameter packs in order with the rest of the TemplateArguments.
901 struct InternalIterator {
902 /// TST - the template specialization whose arguments this iterator
904 const TemplateSpecializationType *TST;
906 /// Index - the index of the template argument in TST.
909 /// CurrentTA - if CurrentTA is not the same as EndTA, then CurrentTA
910 /// points to a TemplateArgument within a parameter pack.
911 TemplateArgument::pack_iterator CurrentTA;
913 /// EndTA - the end iterator of a parameter pack
914 TemplateArgument::pack_iterator EndTA;
916 /// InternalIterator - Constructs an iterator and sets it to the first
917 /// template argument.
918 InternalIterator(const TemplateSpecializationType *TST)
919 : TST(TST), Index(0), CurrentTA(nullptr), EndTA(nullptr) {
924 // Set to first template argument. If not a parameter pack, done.
925 TemplateArgument TA = TST->getArg(0);
926 if (TA.getKind() != TemplateArgument::Pack) return;
928 // Start looking into the parameter pack.
929 CurrentTA = TA.pack_begin();
930 EndTA = TA.pack_end();
932 // Found a valid template argument.
933 if (CurrentTA != EndTA) return;
935 // Parameter pack is empty, use the increment to get to a valid
936 // template argument.
940 /// isEnd - Returns true if the iterator is one past the end.
942 assert(TST && "InternalIterator is invalid with a null TST.");
943 return Index >= TST->getNumArgs();
946 /// &operator++ - Increment the iterator to the next template argument.
947 InternalIterator &operator++() {
948 assert(TST && "InternalIterator is invalid with a null TST.");
953 // If in a parameter pack, advance in the parameter pack.
954 if (CurrentTA != EndTA) {
956 if (CurrentTA != EndTA)
960 // Loop until a template argument is found, or the end is reached.
962 // Advance to the next template argument. Break if reached the end.
963 if (++Index == TST->getNumArgs())
966 // If the TemplateArgument is not a parameter pack, done.
967 TemplateArgument TA = TST->getArg(Index);
968 if (TA.getKind() != TemplateArgument::Pack)
971 // Handle parameter packs.
972 CurrentTA = TA.pack_begin();
973 EndTA = TA.pack_end();
975 // If the parameter pack is empty, try to advance again.
976 if (CurrentTA != EndTA)
982 /// operator* - Returns the appropriate TemplateArgument.
983 reference operator*() const {
984 assert(TST && "InternalIterator is invalid with a null TST.");
985 assert(!isEnd() && "Index exceeds number of arguments.");
986 if (CurrentTA == EndTA)
987 return TST->getArg(Index);
992 /// operator-> - Allow access to the underlying TemplateArgument.
993 pointer operator->() const {
994 assert(TST && "InternalIterator is invalid with a null TST.");
999 bool UseDesugaredIterator;
1000 InternalIterator SugaredIterator;
1001 InternalIterator DesugaredIterator;
1004 TSTiterator(ASTContext &Context, const TemplateSpecializationType *TST)
1005 : UseDesugaredIterator(TST->isSugared() && !TST->isTypeAlias()),
1006 SugaredIterator(TST),
1008 GetTemplateSpecializationType(Context, TST->desugar())) {}
1010 /// &operator++ - Increment the iterator to the next template argument.
1011 TSTiterator &operator++() {
1013 if (UseDesugaredIterator)
1014 ++DesugaredIterator;
1018 /// operator* - Returns the appropriate TemplateArgument.
1019 reference operator*() const {
1020 return *SugaredIterator;
1023 /// operator-> - Allow access to the underlying TemplateArgument.
1024 pointer operator->() const {
1025 return &operator*();
1028 /// isEnd - Returns true if no more TemplateArguments are available.
1029 bool isEnd() const {
1030 return SugaredIterator.isEnd();
1033 /// hasDesugaredTA - Returns true if there is another TemplateArgument
1035 bool hasDesugaredTA() const {
1036 return UseDesugaredIterator && !DesugaredIterator.isEnd();
1039 /// getDesugaredTA - Returns the desugared TemplateArgument.
1040 reference getDesugaredTA() const {
1041 assert(UseDesugaredIterator &&
1042 "Desugared TemplateArgument should not be used.");
1043 return *DesugaredIterator;
1047 // These functions build up the template diff tree, including functions to
1048 // retrieve and compare template arguments.
1050 static const TemplateSpecializationType *GetTemplateSpecializationType(
1051 ASTContext &Context, QualType Ty) {
1052 if (const TemplateSpecializationType *TST =
1053 Ty->getAs<TemplateSpecializationType>())
1056 const RecordType *RT = Ty->getAs<RecordType>();
1061 const ClassTemplateSpecializationDecl *CTSD =
1062 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl());
1067 Ty = Context.getTemplateSpecializationType(
1068 TemplateName(CTSD->getSpecializedTemplate()),
1069 CTSD->getTemplateArgs().asArray(),
1070 Ty.getLocalUnqualifiedType().getCanonicalType());
1072 return Ty->getAs<TemplateSpecializationType>();
1075 /// Returns true if the DiffType is Type and false for Template.
1076 static bool OnlyPerformTypeDiff(ASTContext &Context, QualType FromType,
1078 const TemplateSpecializationType *&FromArgTST,
1079 const TemplateSpecializationType *&ToArgTST) {
1080 if (FromType.isNull() || ToType.isNull())
1083 if (Context.hasSameType(FromType, ToType))
1086 FromArgTST = GetTemplateSpecializationType(Context, FromType);
1087 ToArgTST = GetTemplateSpecializationType(Context, ToType);
1089 if (!FromArgTST || !ToArgTST)
1092 if (!hasSameTemplate(FromArgTST, ToArgTST))
1098 /// DiffTypes - Fills a DiffNode with information about a type difference.
1099 void DiffTypes(const TSTiterator &FromIter, const TSTiterator &ToIter) {
1100 QualType FromType = GetType(FromIter);
1101 QualType ToType = GetType(ToIter);
1103 bool FromDefault = FromIter.isEnd() && !FromType.isNull();
1104 bool ToDefault = ToIter.isEnd() && !ToType.isNull();
1106 const TemplateSpecializationType *FromArgTST = nullptr;
1107 const TemplateSpecializationType *ToArgTST = nullptr;
1108 if (OnlyPerformTypeDiff(Context, FromType, ToType, FromArgTST, ToArgTST)) {
1109 Tree.SetTypeDiff(FromType, ToType, FromDefault, ToDefault);
1110 Tree.SetSame(!FromType.isNull() && !ToType.isNull() &&
1111 Context.hasSameType(FromType, ToType));
1113 assert(FromArgTST && ToArgTST &&
1114 "Both template specializations need to be valid.");
1115 Qualifiers FromQual = FromType.getQualifiers(),
1116 ToQual = ToType.getQualifiers();
1117 FromQual -= QualType(FromArgTST, 0).getQualifiers();
1118 ToQual -= QualType(ToArgTST, 0).getQualifiers();
1119 Tree.SetTemplateDiff(FromArgTST->getTemplateName().getAsTemplateDecl(),
1120 ToArgTST->getTemplateName().getAsTemplateDecl(),
1121 FromQual, ToQual, FromDefault, ToDefault);
1122 DiffTemplate(FromArgTST, ToArgTST);
1126 /// DiffTemplateTemplates - Fills a DiffNode with information about a
1127 /// template template difference.
1128 void DiffTemplateTemplates(const TSTiterator &FromIter,
1129 const TSTiterator &ToIter) {
1130 TemplateDecl *FromDecl = GetTemplateDecl(FromIter);
1131 TemplateDecl *ToDecl = GetTemplateDecl(ToIter);
1132 Tree.SetTemplateTemplateDiff(FromDecl, ToDecl, FromIter.isEnd() && FromDecl,
1133 ToIter.isEnd() && ToDecl);
1134 Tree.SetSame(FromDecl && ToDecl &&
1135 FromDecl->getCanonicalDecl() == ToDecl->getCanonicalDecl());
1138 /// InitializeNonTypeDiffVariables - Helper function for DiffNonTypes
1139 static void InitializeNonTypeDiffVariables(ASTContext &Context,
1140 const TSTiterator &Iter,
1141 NonTypeTemplateParmDecl *Default,
1142 llvm::APSInt &Value, bool &HasInt,
1143 QualType &IntType, bool &IsNullPtr,
1144 Expr *&E, ValueDecl *&VD,
1145 bool &NeedAddressOf) {
1146 if (!Iter.isEnd()) {
1147 switch (Iter->getKind()) {
1149 llvm_unreachable("unknown ArgumentKind");
1150 case TemplateArgument::Integral:
1151 Value = Iter->getAsIntegral();
1153 IntType = Iter->getIntegralType();
1155 case TemplateArgument::Declaration: {
1156 VD = Iter->getAsDecl();
1157 QualType ArgType = Iter->getParamTypeForDecl();
1158 QualType VDType = VD->getType();
1159 if (ArgType->isPointerType() &&
1160 Context.hasSameType(ArgType->getPointeeType(), VDType))
1161 NeedAddressOf = true;
1164 case TemplateArgument::NullPtr:
1167 case TemplateArgument::Expression:
1168 E = Iter->getAsExpr();
1170 } else if (!Default->isParameterPack()) {
1171 E = Default->getDefaultArgument();
1174 if (!Iter.hasDesugaredTA()) return;
1176 const TemplateArgument& TA = Iter.getDesugaredTA();
1177 switch (TA.getKind()) {
1179 llvm_unreachable("unknown ArgumentKind");
1180 case TemplateArgument::Integral:
1181 Value = TA.getAsIntegral();
1183 IntType = TA.getIntegralType();
1185 case TemplateArgument::Declaration: {
1186 VD = TA.getAsDecl();
1187 QualType ArgType = TA.getParamTypeForDecl();
1188 QualType VDType = VD->getType();
1189 if (ArgType->isPointerType() &&
1190 Context.hasSameType(ArgType->getPointeeType(), VDType))
1191 NeedAddressOf = true;
1194 case TemplateArgument::NullPtr:
1197 case TemplateArgument::Expression:
1198 // TODO: Sometimes, the desugared template argument Expr differs from
1199 // the sugared template argument Expr. It may be useful in the future
1200 // but for now, it is just discarded.
1207 /// DiffNonTypes - Handles any template parameters not handled by DiffTypes
1208 /// of DiffTemplatesTemplates, such as integer and declaration parameters.
1209 void DiffNonTypes(const TSTiterator &FromIter, const TSTiterator &ToIter,
1210 NonTypeTemplateParmDecl *FromDefaultNonTypeDecl,
1211 NonTypeTemplateParmDecl *ToDefaultNonTypeDecl) {
1212 Expr *FromExpr = nullptr, *ToExpr = nullptr;
1213 llvm::APSInt FromInt, ToInt;
1214 QualType FromIntType, ToIntType;
1215 ValueDecl *FromValueDecl = nullptr, *ToValueDecl = nullptr;
1216 bool HasFromInt = false, HasToInt = false, FromNullPtr = false,
1217 ToNullPtr = false, NeedFromAddressOf = false, NeedToAddressOf = false;
1218 InitializeNonTypeDiffVariables(
1219 Context, FromIter, FromDefaultNonTypeDecl, FromInt, HasFromInt,
1220 FromIntType, FromNullPtr, FromExpr, FromValueDecl, NeedFromAddressOf);
1221 InitializeNonTypeDiffVariables(Context, ToIter, ToDefaultNonTypeDecl, ToInt,
1222 HasToInt, ToIntType, ToNullPtr, ToExpr,
1223 ToValueDecl, NeedToAddressOf);
1225 bool FromDefault = FromIter.isEnd() &&
1226 (FromExpr || FromValueDecl || HasFromInt || FromNullPtr);
1227 bool ToDefault = ToIter.isEnd() &&
1228 (ToExpr || ToValueDecl || HasToInt || ToNullPtr);
1230 bool FromDeclaration = FromValueDecl || FromNullPtr;
1231 bool ToDeclaration = ToValueDecl || ToNullPtr;
1233 if (FromDeclaration && HasToInt) {
1234 Tree.SetFromDeclarationAndToIntegerDiff(
1235 FromValueDecl, NeedFromAddressOf, FromNullPtr, FromExpr, ToInt,
1236 HasToInt, ToIntType, ToExpr, FromDefault, ToDefault);
1237 Tree.SetSame(false);
1242 if (HasFromInt && ToDeclaration) {
1243 Tree.SetFromIntegerAndToDeclarationDiff(
1244 FromInt, HasFromInt, FromIntType, FromExpr, ToValueDecl,
1245 NeedToAddressOf, ToNullPtr, ToExpr, FromDefault, ToDefault);
1246 Tree.SetSame(false);
1250 if (HasFromInt || HasToInt) {
1251 Tree.SetIntegerDiff(FromInt, ToInt, HasFromInt, HasToInt, FromIntType,
1252 ToIntType, FromExpr, ToExpr, FromDefault, ToDefault);
1253 if (HasFromInt && HasToInt) {
1254 Tree.SetSame(Context.hasSameType(FromIntType, ToIntType) &&
1260 if (FromDeclaration || ToDeclaration) {
1261 Tree.SetDeclarationDiff(FromValueDecl, ToValueDecl, NeedFromAddressOf,
1262 NeedToAddressOf, FromNullPtr, ToNullPtr, FromExpr,
1263 ToExpr, FromDefault, ToDefault);
1264 bool BothNull = FromNullPtr && ToNullPtr;
1265 bool SameValueDecl =
1266 FromValueDecl && ToValueDecl &&
1267 NeedFromAddressOf == NeedToAddressOf &&
1268 FromValueDecl->getCanonicalDecl() == ToValueDecl->getCanonicalDecl();
1269 Tree.SetSame(BothNull || SameValueDecl);
1273 assert((FromExpr || ToExpr) && "Both template arguments cannot be empty.");
1274 Tree.SetExpressionDiff(FromExpr, ToExpr, FromDefault, ToDefault);
1275 Tree.SetSame(IsEqualExpr(Context, FromExpr, ToExpr));
1278 /// DiffTemplate - recursively visits template arguments and stores the
1279 /// argument info into a tree.
1280 void DiffTemplate(const TemplateSpecializationType *FromTST,
1281 const TemplateSpecializationType *ToTST) {
1282 // Begin descent into diffing template tree.
1283 TemplateParameterList *ParamsFrom =
1284 FromTST->getTemplateName().getAsTemplateDecl()->getTemplateParameters();
1285 TemplateParameterList *ParamsTo =
1286 ToTST->getTemplateName().getAsTemplateDecl()->getTemplateParameters();
1287 unsigned TotalArgs = 0;
1288 for (TSTiterator FromIter(Context, FromTST), ToIter(Context, ToTST);
1289 !FromIter.isEnd() || !ToIter.isEnd(); ++TotalArgs) {
1292 // Get the parameter at index TotalArgs. If index is larger
1293 // than the total number of parameters, then there is an
1294 // argument pack, so re-use the last parameter.
1295 unsigned FromParamIndex = std::min(TotalArgs, ParamsFrom->size() - 1);
1296 unsigned ToParamIndex = std::min(TotalArgs, ParamsTo->size() - 1);
1297 NamedDecl *FromParamND = ParamsFrom->getParam(FromParamIndex);
1298 NamedDecl *ToParamND = ParamsTo->getParam(ToParamIndex);
1300 assert(FromParamND->getKind() == ToParamND->getKind() &&
1301 "Parameter Decl are not the same kind.");
1303 if (isa<TemplateTypeParmDecl>(FromParamND)) {
1304 DiffTypes(FromIter, ToIter);
1305 } else if (isa<TemplateTemplateParmDecl>(FromParamND)) {
1306 DiffTemplateTemplates(FromIter, ToIter);
1307 } else if (isa<NonTypeTemplateParmDecl>(FromParamND)) {
1308 NonTypeTemplateParmDecl *FromDefaultNonTypeDecl =
1309 cast<NonTypeTemplateParmDecl>(FromParamND);
1310 NonTypeTemplateParmDecl *ToDefaultNonTypeDecl =
1311 cast<NonTypeTemplateParmDecl>(ToParamND);
1312 DiffNonTypes(FromIter, ToIter, FromDefaultNonTypeDecl,
1313 ToDefaultNonTypeDecl);
1315 llvm_unreachable("Unexpected Decl type.");
1324 /// makeTemplateList - Dump every template alias into the vector.
1325 static void makeTemplateList(
1326 SmallVectorImpl<const TemplateSpecializationType *> &TemplateList,
1327 const TemplateSpecializationType *TST) {
1329 TemplateList.push_back(TST);
1330 if (!TST->isTypeAlias())
1332 TST = TST->getAliasedType()->getAs<TemplateSpecializationType>();
1336 /// hasSameBaseTemplate - Returns true when the base templates are the same,
1337 /// even if the template arguments are not.
1338 static bool hasSameBaseTemplate(const TemplateSpecializationType *FromTST,
1339 const TemplateSpecializationType *ToTST) {
1340 return FromTST->getTemplateName().getAsTemplateDecl()->getCanonicalDecl() ==
1341 ToTST->getTemplateName().getAsTemplateDecl()->getCanonicalDecl();
1344 /// hasSameTemplate - Returns true if both types are specialized from the
1345 /// same template declaration. If they come from different template aliases,
1346 /// do a parallel ascension search to determine the highest template alias in
1347 /// common and set the arguments to them.
1348 static bool hasSameTemplate(const TemplateSpecializationType *&FromTST,
1349 const TemplateSpecializationType *&ToTST) {
1350 // Check the top templates if they are the same.
1351 if (hasSameBaseTemplate(FromTST, ToTST))
1354 // Create vectors of template aliases.
1355 SmallVector<const TemplateSpecializationType*, 1> FromTemplateList,
1358 makeTemplateList(FromTemplateList, FromTST);
1359 makeTemplateList(ToTemplateList, ToTST);
1361 SmallVectorImpl<const TemplateSpecializationType *>::reverse_iterator
1362 FromIter = FromTemplateList.rbegin(), FromEnd = FromTemplateList.rend(),
1363 ToIter = ToTemplateList.rbegin(), ToEnd = ToTemplateList.rend();
1365 // Check if the lowest template types are the same. If not, return.
1366 if (!hasSameBaseTemplate(*FromIter, *ToIter))
1369 // Begin searching up the template aliases. The bottom most template
1370 // matches so move up until one pair does not match. Use the template
1371 // right before that one.
1372 for (; FromIter != FromEnd && ToIter != ToEnd; ++FromIter, ++ToIter) {
1373 if (!hasSameBaseTemplate(*FromIter, *ToIter))
1377 FromTST = FromIter[-1];
1383 /// GetType - Retrieves the template type arguments, including default
1385 static QualType GetType(const TSTiterator &Iter) {
1387 return Iter->getAsType();
1388 if (Iter.hasDesugaredTA())
1389 return Iter.getDesugaredTA().getAsType();
1393 /// GetTemplateDecl - Retrieves the template template arguments, including
1394 /// default arguments.
1395 static TemplateDecl *GetTemplateDecl(const TSTiterator &Iter) {
1397 return Iter->getAsTemplate().getAsTemplateDecl();
1398 if (Iter.hasDesugaredTA())
1399 return Iter.getDesugaredTA().getAsTemplate().getAsTemplateDecl();
1403 /// IsEqualExpr - Returns true if the expressions are the same in regards to
1404 /// template arguments. These expressions are dependent, so profile them
1405 /// instead of trying to evaluate them.
1406 static bool IsEqualExpr(ASTContext &Context, Expr *FromExpr, Expr *ToExpr) {
1407 if (FromExpr == ToExpr)
1410 if (!FromExpr || !ToExpr)
1413 llvm::FoldingSetNodeID FromID, ToID;
1414 FromExpr->Profile(FromID, Context, true);
1415 ToExpr->Profile(ToID, Context, true);
1416 return FromID == ToID;
1419 // These functions converts the tree representation of the template
1420 // differences into the internal character vector.
1422 /// TreeToString - Converts the Tree object into a character stream which
1423 /// will later be turned into the output string.
1424 void TreeToString(int Indent = 1) {
1427 OS.indent(2 * Indent);
1431 // Handle cases where the difference is not templates with different
1433 switch (Tree.GetKind()) {
1434 case DiffTree::Invalid:
1435 llvm_unreachable("Template diffing failed with bad DiffNode");
1436 case DiffTree::Type: {
1437 QualType FromType, ToType;
1438 Tree.GetTypeDiff(FromType, ToType);
1439 PrintTypeNames(FromType, ToType, Tree.FromDefault(), Tree.ToDefault(),
1443 case DiffTree::Expression: {
1444 Expr *FromExpr, *ToExpr;
1445 Tree.GetExpressionDiff(FromExpr, ToExpr);
1446 PrintExpr(FromExpr, ToExpr, Tree.FromDefault(), Tree.ToDefault(),
1450 case DiffTree::TemplateTemplate: {
1451 TemplateDecl *FromTD, *ToTD;
1452 Tree.GetTemplateTemplateDiff(FromTD, ToTD);
1453 PrintTemplateTemplate(FromTD, ToTD, Tree.FromDefault(),
1454 Tree.ToDefault(), Tree.NodeIsSame());
1457 case DiffTree::Integer: {
1458 llvm::APSInt FromInt, ToInt;
1459 Expr *FromExpr, *ToExpr;
1460 bool IsValidFromInt, IsValidToInt;
1461 QualType FromIntType, ToIntType;
1462 Tree.GetIntegerDiff(FromInt, ToInt, IsValidFromInt, IsValidToInt,
1463 FromIntType, ToIntType, FromExpr, ToExpr);
1464 PrintAPSInt(FromInt, ToInt, IsValidFromInt, IsValidToInt, FromIntType,
1465 ToIntType, FromExpr, ToExpr, Tree.FromDefault(),
1466 Tree.ToDefault(), Tree.NodeIsSame());
1469 case DiffTree::Declaration: {
1470 ValueDecl *FromValueDecl, *ToValueDecl;
1471 bool FromAddressOf, ToAddressOf;
1472 bool FromNullPtr, ToNullPtr;
1473 Expr *FromExpr, *ToExpr;
1474 Tree.GetDeclarationDiff(FromValueDecl, ToValueDecl, FromAddressOf,
1475 ToAddressOf, FromNullPtr, ToNullPtr, FromExpr,
1477 PrintValueDecl(FromValueDecl, ToValueDecl, FromAddressOf, ToAddressOf,
1478 FromNullPtr, ToNullPtr, FromExpr, ToExpr,
1479 Tree.FromDefault(), Tree.ToDefault(), Tree.NodeIsSame());
1482 case DiffTree::FromDeclarationAndToInteger: {
1483 ValueDecl *FromValueDecl;
1491 Tree.GetFromDeclarationAndToIntegerDiff(
1492 FromValueDecl, FromAddressOf, FromNullPtr, FromExpr, ToInt,
1493 IsValidToInt, ToIntType, ToExpr);
1494 assert((FromValueDecl || FromNullPtr) && IsValidToInt);
1495 PrintValueDeclAndInteger(FromValueDecl, FromAddressOf, FromNullPtr,
1496 FromExpr, Tree.FromDefault(), ToInt, ToIntType,
1497 ToExpr, Tree.ToDefault());
1500 case DiffTree::FromIntegerAndToDeclaration: {
1501 llvm::APSInt FromInt;
1502 bool IsValidFromInt;
1503 QualType FromIntType;
1505 ValueDecl *ToValueDecl;
1509 Tree.GetFromIntegerAndToDeclarationDiff(
1510 FromInt, IsValidFromInt, FromIntType, FromExpr, ToValueDecl,
1511 ToAddressOf, ToNullPtr, ToExpr);
1512 assert(IsValidFromInt && (ToValueDecl || ToNullPtr));
1513 PrintIntegerAndValueDecl(FromInt, FromIntType, FromExpr,
1514 Tree.FromDefault(), ToValueDecl, ToAddressOf,
1515 ToNullPtr, ToExpr, Tree.ToDefault());
1518 case DiffTree::Template: {
1519 // Node is root of template. Recurse on children.
1520 TemplateDecl *FromTD, *ToTD;
1521 Qualifiers FromQual, ToQual;
1522 Tree.GetTemplateDiff(FromTD, ToTD, FromQual, ToQual);
1524 PrintQualifiers(FromQual, ToQual);
1526 if (!Tree.HasChildren()) {
1527 // If we're dealing with a template specialization with zero
1528 // arguments, there are no children; special-case this.
1529 OS << FromTD->getNameAsString() << "<>";
1533 OS << FromTD->getNameAsString() << '<';
1535 unsigned NumElideArgs = 0;
1536 bool AllArgsElided = true;
1539 if (Tree.NodeIsSame()) {
1543 AllArgsElided = false;
1544 if (NumElideArgs > 0) {
1545 PrintElideArgs(NumElideArgs, Indent);
1550 TreeToString(Indent);
1551 if (Tree.HasNextSibling())
1553 } while (Tree.AdvanceSibling());
1554 if (NumElideArgs > 0) {
1558 PrintElideArgs(NumElideArgs, Indent);
1568 // To signal to the text printer that a certain text needs to be bolded,
1569 // a special character is injected into the character stream which the
1570 // text printer will later strip out.
1572 /// Bold - Start bolding text.
1574 assert(!IsBold && "Attempting to bold text that is already bold.");
1577 OS << ToggleHighlight;
1580 /// Unbold - Stop bolding text.
1582 assert(IsBold && "Attempting to remove bold from unbold text.");
1585 OS << ToggleHighlight;
1588 // Functions to print out the arguments and highlighting the difference.
1590 /// PrintTypeNames - prints the typenames, bolding differences. Will detect
1591 /// typenames that are the same and attempt to disambiguate them by using
1592 /// canonical typenames.
1593 void PrintTypeNames(QualType FromType, QualType ToType,
1594 bool FromDefault, bool ToDefault, bool Same) {
1595 assert((!FromType.isNull() || !ToType.isNull()) &&
1596 "Only one template argument may be missing.");
1599 OS << FromType.getAsString(Policy);
1603 if (!FromType.isNull() && !ToType.isNull() &&
1604 FromType.getLocalUnqualifiedType() ==
1605 ToType.getLocalUnqualifiedType()) {
1606 Qualifiers FromQual = FromType.getLocalQualifiers(),
1607 ToQual = ToType.getLocalQualifiers();
1608 PrintQualifiers(FromQual, ToQual);
1609 FromType.getLocalUnqualifiedType().print(OS, Policy);
1613 std::string FromTypeStr = FromType.isNull() ? "(no argument)"
1614 : FromType.getAsString(Policy);
1615 std::string ToTypeStr = ToType.isNull() ? "(no argument)"
1616 : ToType.getAsString(Policy);
1617 // Switch to canonical typename if it is better.
1618 // TODO: merge this with other aka printing above.
1619 if (FromTypeStr == ToTypeStr) {
1620 std::string FromCanTypeStr =
1621 FromType.getCanonicalType().getAsString(Policy);
1622 std::string ToCanTypeStr = ToType.getCanonicalType().getAsString(Policy);
1623 if (FromCanTypeStr != ToCanTypeStr) {
1624 FromTypeStr = FromCanTypeStr;
1625 ToTypeStr = ToCanTypeStr;
1629 if (PrintTree) OS << '[';
1630 OS << (FromDefault ? "(default) " : "");
1635 OS << " != " << (ToDefault ? "(default) " : "");
1643 /// PrintExpr - Prints out the expr template arguments, highlighting argument
1645 void PrintExpr(const Expr *FromExpr, const Expr *ToExpr, bool FromDefault,
1646 bool ToDefault, bool Same) {
1647 assert((FromExpr || ToExpr) &&
1648 "Only one template argument may be missing.");
1650 PrintExpr(FromExpr);
1651 } else if (!PrintTree) {
1652 OS << (FromDefault ? "(default) " : "");
1654 PrintExpr(FromExpr);
1657 OS << (FromDefault ? "[(default) " : "[");
1659 PrintExpr(FromExpr);
1661 OS << " != " << (ToDefault ? "(default) " : "");
1669 /// PrintExpr - Actual formatting and printing of expressions.
1670 void PrintExpr(const Expr *E) {
1672 E->printPretty(OS, nullptr, Policy);
1675 OS << "(no argument)";
1678 /// PrintTemplateTemplate - Handles printing of template template arguments,
1679 /// highlighting argument differences.
1680 void PrintTemplateTemplate(TemplateDecl *FromTD, TemplateDecl *ToTD,
1681 bool FromDefault, bool ToDefault, bool Same) {
1682 assert((FromTD || ToTD) && "Only one template argument may be missing.");
1684 std::string FromName = FromTD ? FromTD->getName() : "(no argument)";
1685 std::string ToName = ToTD ? ToTD->getName() : "(no argument)";
1686 if (FromTD && ToTD && FromName == ToName) {
1687 FromName = FromTD->getQualifiedNameAsString();
1688 ToName = ToTD->getQualifiedNameAsString();
1692 OS << "template " << FromTD->getNameAsString();
1693 } else if (!PrintTree) {
1694 OS << (FromDefault ? "(default) template " : "template ");
1699 OS << (FromDefault ? "[(default) template " : "[template ");
1703 OS << " != " << (ToDefault ? "(default) template " : "template ");
1711 /// PrintAPSInt - Handles printing of integral arguments, highlighting
1712 /// argument differences.
1713 void PrintAPSInt(const llvm::APSInt &FromInt, const llvm::APSInt &ToInt,
1714 bool IsValidFromInt, bool IsValidToInt, QualType FromIntType,
1715 QualType ToIntType, Expr *FromExpr, Expr *ToExpr,
1716 bool FromDefault, bool ToDefault, bool Same) {
1717 assert((IsValidFromInt || IsValidToInt) &&
1718 "Only one integral argument may be missing.");
1721 if (FromIntType->isBooleanType()) {
1722 OS << ((FromInt == 0) ? "false" : "true");
1724 OS << FromInt.toString(10);
1729 bool PrintType = IsValidFromInt && IsValidToInt &&
1730 !Context.hasSameType(FromIntType, ToIntType);
1733 OS << (FromDefault ? "(default) " : "");
1734 PrintAPSInt(FromInt, FromExpr, IsValidFromInt, FromIntType, PrintType);
1736 OS << (FromDefault ? "[(default) " : "[");
1737 PrintAPSInt(FromInt, FromExpr, IsValidFromInt, FromIntType, PrintType);
1738 OS << " != " << (ToDefault ? "(default) " : "");
1739 PrintAPSInt(ToInt, ToExpr, IsValidToInt, ToIntType, PrintType);
1744 /// PrintAPSInt - If valid, print the APSInt. If the expression is
1745 /// gives more information, print it too.
1746 void PrintAPSInt(const llvm::APSInt &Val, Expr *E, bool Valid,
1747 QualType IntType, bool PrintType) {
1750 if (HasExtraInfo(E)) {
1760 IntType.print(OS, Context.getPrintingPolicy());
1765 if (IntType->isBooleanType()) {
1766 OS << ((Val == 0) ? "false" : "true");
1768 OS << Val.toString(10);
1773 OS << "(no argument)";
1778 /// HasExtraInfo - Returns true if E is not an integer literal, the
1779 /// negation of an integer literal, or a boolean literal.
1780 bool HasExtraInfo(Expr *E) {
1781 if (!E) return false;
1783 E = E->IgnoreImpCasts();
1785 if (isa<IntegerLiteral>(E)) return false;
1787 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E))
1788 if (UO->getOpcode() == UO_Minus)
1789 if (isa<IntegerLiteral>(UO->getSubExpr()))
1792 if (isa<CXXBoolLiteralExpr>(E))
1798 void PrintValueDecl(ValueDecl *VD, bool AddressOf, Expr *E, bool NullPtr) {
1802 OS << VD->getName();
1807 if (E && !isa<CXXNullPtrLiteralExpr>(E)) {
1822 OS << "(no argument)";
1825 /// PrintDecl - Handles printing of Decl arguments, highlighting
1826 /// argument differences.
1827 void PrintValueDecl(ValueDecl *FromValueDecl, ValueDecl *ToValueDecl,
1828 bool FromAddressOf, bool ToAddressOf, bool FromNullPtr,
1829 bool ToNullPtr, Expr *FromExpr, Expr *ToExpr,
1830 bool FromDefault, bool ToDefault, bool Same) {
1831 assert((FromValueDecl || FromNullPtr || ToValueDecl || ToNullPtr) &&
1832 "Only one Decl argument may be NULL");
1835 PrintValueDecl(FromValueDecl, FromAddressOf, FromExpr, FromNullPtr);
1836 } else if (!PrintTree) {
1837 OS << (FromDefault ? "(default) " : "");
1839 PrintValueDecl(FromValueDecl, FromAddressOf, FromExpr, FromNullPtr);
1842 OS << (FromDefault ? "[(default) " : "[");
1844 PrintValueDecl(FromValueDecl, FromAddressOf, FromExpr, FromNullPtr);
1846 OS << " != " << (ToDefault ? "(default) " : "");
1848 PrintValueDecl(ToValueDecl, ToAddressOf, ToExpr, ToNullPtr);
1854 /// PrintValueDeclAndInteger - Uses the print functions for ValueDecl and
1855 /// APSInt to print a mixed difference.
1856 void PrintValueDeclAndInteger(ValueDecl *VD, bool NeedAddressOf,
1857 bool IsNullPtr, Expr *VDExpr, bool DefaultDecl,
1858 const llvm::APSInt &Val, QualType IntType,
1859 Expr *IntExpr, bool DefaultInt) {
1861 OS << (DefaultDecl ? "(default) " : "");
1863 PrintValueDecl(VD, NeedAddressOf, VDExpr, IsNullPtr);
1866 OS << (DefaultDecl ? "[(default) " : "[");
1868 PrintValueDecl(VD, NeedAddressOf, VDExpr, IsNullPtr);
1870 OS << " != " << (DefaultInt ? "(default) " : "");
1871 PrintAPSInt(Val, IntExpr, true /*Valid*/, IntType, false /*PrintType*/);
1876 /// PrintIntegerAndValueDecl - Uses the print functions for APSInt and
1877 /// ValueDecl to print a mixed difference.
1878 void PrintIntegerAndValueDecl(const llvm::APSInt &Val, QualType IntType,
1879 Expr *IntExpr, bool DefaultInt, ValueDecl *VD,
1880 bool NeedAddressOf, bool IsNullPtr,
1881 Expr *VDExpr, bool DefaultDecl) {
1883 OS << (DefaultInt ? "(default) " : "");
1884 PrintAPSInt(Val, IntExpr, true /*Valid*/, IntType, false /*PrintType*/);
1886 OS << (DefaultInt ? "[(default) " : "[");
1887 PrintAPSInt(Val, IntExpr, true /*Valid*/, IntType, false /*PrintType*/);
1888 OS << " != " << (DefaultDecl ? "(default) " : "");
1890 PrintValueDecl(VD, NeedAddressOf, VDExpr, IsNullPtr);
1896 // Prints the appropriate placeholder for elided template arguments.
1897 void PrintElideArgs(unsigned NumElideArgs, unsigned Indent) {
1900 for (unsigned i = 0; i < Indent; ++i)
1903 if (NumElideArgs == 0) return;
1904 if (NumElideArgs == 1)
1907 OS << "[" << NumElideArgs << " * ...]";
1910 // Prints and highlights differences in Qualifiers.
1911 void PrintQualifiers(Qualifiers FromQual, Qualifiers ToQual) {
1912 // Both types have no qualifiers
1913 if (FromQual.empty() && ToQual.empty())
1916 // Both types have same qualifiers
1917 if (FromQual == ToQual) {
1918 PrintQualifier(FromQual, /*ApplyBold*/false);
1922 // Find common qualifiers and strip them from FromQual and ToQual.
1923 Qualifiers CommonQual = Qualifiers::removeCommonQualifiers(FromQual,
1926 // The qualifiers are printed before the template name.
1928 // The common qualifiers are printed. Then, qualifiers only in this type
1929 // are printed and highlighted. Finally, qualifiers only in the other
1930 // type are printed and highlighted inside parentheses after "missing".
1932 // Qualifiers are printed next to each other, inside brackets, and
1933 // separated by "!=". The printing order is:
1934 // common qualifiers, highlighted from qualifiers, "!=",
1935 // common qualifiers, highlighted to qualifiers
1938 if (CommonQual.empty() && FromQual.empty()) {
1940 OS << "(no qualifiers) ";
1943 PrintQualifier(CommonQual, /*ApplyBold*/false);
1944 PrintQualifier(FromQual, /*ApplyBold*/true);
1947 if (CommonQual.empty() && ToQual.empty()) {
1949 OS << "(no qualifiers)";
1952 PrintQualifier(CommonQual, /*ApplyBold*/false,
1953 /*appendSpaceIfNonEmpty*/!ToQual.empty());
1954 PrintQualifier(ToQual, /*ApplyBold*/true,
1955 /*appendSpaceIfNonEmpty*/false);
1959 PrintQualifier(CommonQual, /*ApplyBold*/false);
1960 PrintQualifier(FromQual, /*ApplyBold*/true);
1964 void PrintQualifier(Qualifiers Q, bool ApplyBold,
1965 bool AppendSpaceIfNonEmpty = true) {
1966 if (Q.empty()) return;
1967 if (ApplyBold) Bold();
1968 Q.print(OS, Policy, AppendSpaceIfNonEmpty);
1969 if (ApplyBold) Unbold();
1974 TemplateDiff(raw_ostream &OS, ASTContext &Context, QualType FromType,
1975 QualType ToType, bool PrintTree, bool PrintFromType,
1976 bool ElideType, bool ShowColor)
1978 Policy(Context.getLangOpts()),
1979 ElideType(ElideType),
1980 PrintTree(PrintTree),
1981 ShowColor(ShowColor),
1982 // When printing a single type, the FromType is the one printed.
1983 FromTemplateType(PrintFromType ? FromType : ToType),
1984 ToTemplateType(PrintFromType ? ToType : FromType),
1989 /// DiffTemplate - Start the template type diffing.
1990 void DiffTemplate() {
1991 Qualifiers FromQual = FromTemplateType.getQualifiers(),
1992 ToQual = ToTemplateType.getQualifiers();
1994 const TemplateSpecializationType *FromOrigTST =
1995 GetTemplateSpecializationType(Context, FromTemplateType);
1996 const TemplateSpecializationType *ToOrigTST =
1997 GetTemplateSpecializationType(Context, ToTemplateType);
1999 // Only checking templates.
2000 if (!FromOrigTST || !ToOrigTST)
2003 // Different base templates.
2004 if (!hasSameTemplate(FromOrigTST, ToOrigTST)) {
2008 FromQual -= QualType(FromOrigTST, 0).getQualifiers();
2009 ToQual -= QualType(ToOrigTST, 0).getQualifiers();
2011 // Same base template, but different arguments.
2012 Tree.SetTemplateDiff(FromOrigTST->getTemplateName().getAsTemplateDecl(),
2013 ToOrigTST->getTemplateName().getAsTemplateDecl(),
2014 FromQual, ToQual, false /*FromDefault*/,
2015 false /*ToDefault*/);
2017 DiffTemplate(FromOrigTST, ToOrigTST);
2020 /// Emit - When the two types given are templated types with the same
2021 /// base template, a string representation of the type difference will be
2022 /// emitted to the stream and return true. Otherwise, return false.
2024 Tree.StartTraverse();
2029 assert(!IsBold && "Bold is applied to end of string.");
2032 }; // end class TemplateDiff
2033 } // end anonymous namespace
2035 /// FormatTemplateTypeDiff - A helper static function to start the template
2036 /// diff and return the properly formatted string. Returns true if the diff
2038 static bool FormatTemplateTypeDiff(ASTContext &Context, QualType FromType,
2039 QualType ToType, bool PrintTree,
2040 bool PrintFromType, bool ElideType,
2041 bool ShowColors, raw_ostream &OS) {
2043 PrintFromType = true;
2044 TemplateDiff TD(OS, Context, FromType, ToType, PrintTree, PrintFromType,
2045 ElideType, ShowColors);