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 //===----------------------------------------------------------------------===//
13 #include "clang/AST/ASTDiagnostic.h"
14 #include "clang/AST/ASTContext.h"
15 #include "clang/AST/ASTLambda.h"
16 #include "clang/AST/Attr.h"
17 #include "clang/AST/DeclObjC.h"
18 #include "clang/AST/DeclTemplate.h"
19 #include "clang/AST/ExprCXX.h"
20 #include "clang/AST/TemplateBase.h"
21 #include "clang/AST/Type.h"
22 #include "llvm/ADT/SmallString.h"
23 #include "llvm/Support/raw_ostream.h"
25 using namespace clang;
27 // Returns a desugared version of the QualType, and marks ShouldAKA as true
28 // whenever we remove significant sugar from the type.
29 static QualType Desugar(ASTContext &Context, QualType QT, bool &ShouldAKA) {
30 QualifierCollector QC;
33 const Type *Ty = QC.strip(QT);
35 // Don't aka just because we saw an elaborated type...
36 if (const ElaboratedType *ET = dyn_cast<ElaboratedType>(Ty)) {
40 // ... or a paren type ...
41 if (const ParenType *PT = dyn_cast<ParenType>(Ty)) {
45 // ...or a substituted template type parameter ...
46 if (const SubstTemplateTypeParmType *ST =
47 dyn_cast<SubstTemplateTypeParmType>(Ty)) {
51 // ...or an attributed type...
52 if (const AttributedType *AT = dyn_cast<AttributedType>(Ty)) {
56 // ...or an adjusted type...
57 if (const AdjustedType *AT = dyn_cast<AdjustedType>(Ty)) {
61 // ... or an auto type.
62 if (const AutoType *AT = dyn_cast<AutoType>(Ty)) {
69 // Don't desugar template specializations, unless it's an alias template.
70 if (const TemplateSpecializationType *TST
71 = dyn_cast<TemplateSpecializationType>(Ty))
72 if (!TST->isTypeAlias())
75 // Don't desugar magic Objective-C types.
76 if (QualType(Ty,0) == Context.getObjCIdType() ||
77 QualType(Ty,0) == Context.getObjCClassType() ||
78 QualType(Ty,0) == Context.getObjCSelType() ||
79 QualType(Ty,0) == Context.getObjCProtoType())
82 // Don't desugar va_list.
83 if (QualType(Ty,0) == Context.getBuiltinVaListType())
86 // Otherwise, do a single-step desugar.
89 switch (Ty->getTypeClass()) {
90 #define ABSTRACT_TYPE(Class, Base)
91 #define TYPE(Class, Base) \
93 const Class##Type *CTy = cast<Class##Type>(Ty); \
94 if (CTy->isSugared()) { \
96 Underlying = CTy->desugar(); \
100 #include "clang/AST/TypeNodes.def"
103 // If it wasn't sugared, we're done.
107 // If the desugared type is a vector type, we don't want to expand
108 // it, it will turn into an attribute mess. People want their "vec4".
109 if (isa<VectorType>(Underlying))
112 // Don't desugar through the primary typedef of an anonymous type.
113 if (const TagType *UTT = Underlying->getAs<TagType>())
114 if (const TypedefType *QTT = dyn_cast<TypedefType>(QT))
115 if (UTT->getDecl()->getTypedefNameForAnonDecl() == QTT->getDecl())
118 // Record that we actually looked through an opaque type here.
123 // If we have a pointer-like type, desugar the pointee as well.
124 // FIXME: Handle other pointer-like types.
125 if (const PointerType *Ty = QT->getAs<PointerType>()) {
126 QT = Context.getPointerType(Desugar(Context, Ty->getPointeeType(),
128 } else if (const LValueReferenceType *Ty = QT->getAs<LValueReferenceType>()) {
129 QT = Context.getLValueReferenceType(Desugar(Context, Ty->getPointeeType(),
131 } else if (const RValueReferenceType *Ty = QT->getAs<RValueReferenceType>()) {
132 QT = Context.getRValueReferenceType(Desugar(Context, Ty->getPointeeType(),
136 return QC.apply(Context, QT);
139 /// \brief Convert the given type to a string suitable for printing as part of
142 /// There are four main criteria when determining whether we should have an
143 /// a.k.a. clause when pretty-printing a type:
145 /// 1) Some types provide very minimal sugar that doesn't impede the
146 /// user's understanding --- for example, elaborated type
147 /// specifiers. If this is all the sugar we see, we don't want an
149 /// 2) Some types are technically sugared but are much more familiar
150 /// when seen in their sugared form --- for example, va_list,
151 /// vector types, and the magic Objective C types. We don't
152 /// want to desugar these, even if we do produce an a.k.a. clause.
153 /// 3) Some types may have already been desugared previously in this diagnostic.
154 /// if this is the case, doing another "aka" would just be clutter.
155 /// 4) Two different types within the same diagnostic have the same output
156 /// string. In this case, force an a.k.a with the desugared type when
157 /// doing so will provide additional information.
159 /// \param Context the context in which the type was allocated
160 /// \param Ty the type to print
161 /// \param QualTypeVals pointer values to QualTypes which are used in the
162 /// diagnostic message
164 ConvertTypeToDiagnosticString(ASTContext &Context, QualType Ty,
165 ArrayRef<DiagnosticsEngine::ArgumentValue> PrevArgs,
166 ArrayRef<intptr_t> QualTypeVals) {
167 // FIXME: Playing with std::string is really slow.
168 bool ForceAKA = false;
169 QualType CanTy = Ty.getCanonicalType();
170 std::string S = Ty.getAsString(Context.getPrintingPolicy());
171 std::string CanS = CanTy.getAsString(Context.getPrintingPolicy());
173 for (unsigned I = 0, E = QualTypeVals.size(); I != E; ++I) {
175 QualType::getFromOpaquePtr(reinterpret_cast<void*>(QualTypeVals[I]));
176 if (CompareTy.isNull())
179 continue; // Same types
180 QualType CompareCanTy = CompareTy.getCanonicalType();
181 if (CompareCanTy == CanTy)
182 continue; // Same canonical types
183 std::string CompareS = CompareTy.getAsString(Context.getPrintingPolicy());
185 QualType CompareDesugar = Desugar(Context, CompareTy, aka);
186 std::string CompareDesugarStr =
187 CompareDesugar.getAsString(Context.getPrintingPolicy());
188 if (CompareS != S && CompareDesugarStr != S)
189 continue; // The type string is different than the comparison string
190 // and the desugared comparison string.
191 std::string CompareCanS =
192 CompareCanTy.getAsString(Context.getPrintingPolicy());
194 if (CompareCanS == CanS)
195 continue; // No new info from canonical type
201 // Check to see if we already desugared this type in this
202 // diagnostic. If so, don't do it again.
203 bool Repeated = false;
204 for (unsigned i = 0, e = PrevArgs.size(); i != e; ++i) {
205 // TODO: Handle ak_declcontext case.
206 if (PrevArgs[i].first == DiagnosticsEngine::ak_qualtype) {
207 void *Ptr = (void*)PrevArgs[i].second;
208 QualType PrevTy(QualType::getFromOpaquePtr(Ptr));
216 // Consider producing an a.k.a. clause if removing all the direct
217 // sugar gives us something "significantly different".
219 bool ShouldAKA = false;
220 QualType DesugaredTy = Desugar(Context, Ty, ShouldAKA);
221 if (ShouldAKA || ForceAKA) {
222 if (DesugaredTy == Ty) {
223 DesugaredTy = Ty.getCanonicalType();
225 std::string akaStr = DesugaredTy.getAsString(Context.getPrintingPolicy());
227 S = "'" + S + "' (aka '" + akaStr + "')";
232 // Give some additional info on vector types. These are either not desugared
233 // or displaying complex __attribute__ expressions so add details of the
234 // type and element count.
235 if (Ty->isVectorType()) {
236 const VectorType *VTy = Ty->getAs<VectorType>();
237 std::string DecoratedString;
238 llvm::raw_string_ostream OS(DecoratedString);
239 const char *Values = VTy->getNumElements() > 1 ? "values" : "value";
240 OS << "'" << S << "' (vector of " << VTy->getNumElements() << " '"
241 << VTy->getElementType().getAsString(Context.getPrintingPolicy())
242 << "' " << Values << ")";
251 static bool FormatTemplateTypeDiff(ASTContext &Context, QualType FromType,
252 QualType ToType, bool PrintTree,
253 bool PrintFromType, bool ElideType,
254 bool ShowColors, raw_ostream &OS);
256 void clang::FormatASTNodeDiagnosticArgument(
257 DiagnosticsEngine::ArgumentKind Kind,
261 ArrayRef<DiagnosticsEngine::ArgumentValue> PrevArgs,
262 SmallVectorImpl<char> &Output,
264 ArrayRef<intptr_t> QualTypeVals) {
265 ASTContext &Context = *static_cast<ASTContext*>(Cookie);
267 size_t OldEnd = Output.size();
268 llvm::raw_svector_ostream OS(Output);
269 bool NeedQuotes = true;
272 default: llvm_unreachable("unknown ArgumentKind");
273 case DiagnosticsEngine::ak_qualtype_pair: {
274 TemplateDiffTypes &TDT = *reinterpret_cast<TemplateDiffTypes*>(Val);
276 QualType::getFromOpaquePtr(reinterpret_cast<void*>(TDT.FromType));
278 QualType::getFromOpaquePtr(reinterpret_cast<void*>(TDT.ToType));
280 if (FormatTemplateTypeDiff(Context, FromType, ToType, TDT.PrintTree,
281 TDT.PrintFromType, TDT.ElideType,
282 TDT.ShowColors, OS)) {
283 NeedQuotes = !TDT.PrintTree;
284 TDT.TemplateDiffUsed = true;
288 // Don't fall-back during tree printing. The caller will handle
293 // Attempting to do a template diff on non-templates. Set the variables
294 // and continue with regular type printing of the appropriate type.
295 Val = TDT.PrintFromType ? TDT.FromType : TDT.ToType;
296 Modifier = StringRef();
297 Argument = StringRef();
300 case DiagnosticsEngine::ak_qualtype: {
301 assert(Modifier.empty() && Argument.empty() &&
302 "Invalid modifier for QualType argument");
304 QualType Ty(QualType::getFromOpaquePtr(reinterpret_cast<void*>(Val)));
305 OS << ConvertTypeToDiagnosticString(Context, Ty, PrevArgs, QualTypeVals);
309 case DiagnosticsEngine::ak_declarationname: {
310 if (Modifier == "objcclass" && Argument.empty())
312 else if (Modifier == "objcinstance" && Argument.empty())
315 assert(Modifier.empty() && Argument.empty() &&
316 "Invalid modifier for DeclarationName argument");
318 OS << DeclarationName::getFromOpaqueInteger(Val);
321 case DiagnosticsEngine::ak_nameddecl: {
323 if (Modifier == "q" && Argument.empty())
326 assert(Modifier.empty() && Argument.empty() &&
327 "Invalid modifier for NamedDecl* argument");
330 const NamedDecl *ND = reinterpret_cast<const NamedDecl*>(Val);
331 ND->getNameForDiagnostic(OS, Context.getPrintingPolicy(), Qualified);
334 case DiagnosticsEngine::ak_nestednamespec: {
335 NestedNameSpecifier *NNS = reinterpret_cast<NestedNameSpecifier*>(Val);
336 NNS->print(OS, Context.getPrintingPolicy());
340 case DiagnosticsEngine::ak_declcontext: {
341 DeclContext *DC = reinterpret_cast<DeclContext *> (Val);
342 assert(DC && "Should never have a null declaration context");
345 if (DC->isTranslationUnit()) {
346 // FIXME: Get these strings from some localized place
347 if (Context.getLangOpts().CPlusPlus)
348 OS << "the global namespace";
350 OS << "the global scope";
351 } else if (TypeDecl *Type = dyn_cast<TypeDecl>(DC)) {
352 OS << ConvertTypeToDiagnosticString(Context,
353 Context.getTypeDeclType(Type),
354 PrevArgs, QualTypeVals);
356 // FIXME: Get these strings from some localized place
357 if (isa<BlockDecl>(DC)) {
358 OS << "block literal";
361 if (isLambdaCallOperator(DC)) {
362 OS << "lambda expression";
365 NamedDecl *ND = cast<NamedDecl>(DC);
366 if (isa<NamespaceDecl>(ND))
368 else if (isa<ObjCMethodDecl>(ND))
370 else if (isa<FunctionDecl>(ND))
374 ND->getNameForDiagnostic(OS, Context.getPrintingPolicy(), true);
379 case DiagnosticsEngine::ak_attr: {
380 const Attr *At = reinterpret_cast<Attr *>(Val);
381 assert(At && "Received null Attr object!");
382 OS << '\'' << At->getSpelling() << '\'';
392 Output.insert(Output.begin()+OldEnd, '\'');
393 Output.push_back('\'');
397 /// TemplateDiff - A class that constructs a pretty string for a pair of
398 /// QualTypes. For the pair of types, a diff tree will be created containing
399 /// all the information about the templates and template arguments. Afterwards,
400 /// the tree is transformed to a string according to the options passed in.
403 /// Context - The ASTContext which is used for comparing template arguments.
406 /// Policy - Used during expression printing.
407 PrintingPolicy Policy;
409 /// ElideType - Option to elide identical types.
412 /// PrintTree - Format output string as a tree.
415 /// ShowColor - Diagnostics support color, so bolding will be used.
418 /// FromType - When single type printing is selected, this is the type to be
419 /// be printed. When tree printing is selected, this type will show up first
423 /// ToType - The type that FromType is compared to. Only in tree printing
424 /// will this type be outputed.
427 /// OS - The stream used to construct the output strings.
430 /// IsBold - Keeps track of the bold formatting for the output string.
433 /// DiffTree - A tree representation the differences between two types.
436 /// DiffKind - The difference in a DiffNode and which fields are used.
438 /// Incomplete or invalid node.
440 /// Another level of templates, uses TemplateDecl and Qualifiers
442 /// Type difference, uses QualType
444 /// Expression difference, uses Expr
446 /// Template argument difference, uses TemplateDecl
448 /// Integer difference, uses APSInt and Expr
450 /// Declaration difference, uses ValueDecl
454 /// DiffNode - The root node stores the original type. Each child node
455 /// stores template arguments of their parents. For templated types, the
456 /// template decl is also stored.
460 /// NextNode - The index of the next sibling node or 0.
463 /// ChildNode - The index of the first child node or 0.
466 /// ParentNode - The index of the parent node.
469 /// FromType, ToType - The type arguments.
470 QualType FromType, ToType;
472 /// FromExpr, ToExpr - The expression arguments.
473 Expr *FromExpr, *ToExpr;
475 /// FromNullPtr, ToNullPtr - If the template argument is a nullptr
476 bool FromNullPtr, ToNullPtr;
478 /// FromTD, ToTD - The template decl for template template
479 /// arguments or the type arguments that are templates.
480 TemplateDecl *FromTD, *ToTD;
482 /// FromQual, ToQual - Qualifiers for template types.
483 Qualifiers FromQual, ToQual;
485 /// FromInt, ToInt - APSInt's for integral arguments.
486 llvm::APSInt FromInt, ToInt;
488 /// IsValidFromInt, IsValidToInt - Whether the APSInt's are valid.
489 bool IsValidFromInt, IsValidToInt;
491 /// FromValueDecl, ToValueDecl - Whether the argument is a decl.
492 ValueDecl *FromValueDecl, *ToValueDecl;
494 /// FromAddressOf, ToAddressOf - Whether the ValueDecl needs an address of
495 /// operator before it.
496 bool FromAddressOf, ToAddressOf;
498 /// FromDefault, ToDefault - Whether the argument is a default argument.
499 bool FromDefault, ToDefault;
501 /// Same - Whether the two arguments evaluate to the same value.
504 DiffNode(unsigned ParentNode = 0)
505 : Kind(Invalid), NextNode(0), ChildNode(0), ParentNode(ParentNode),
506 FromType(), ToType(), FromExpr(nullptr), ToExpr(nullptr),
507 FromNullPtr(false), ToNullPtr(false),
508 FromTD(nullptr), ToTD(nullptr), IsValidFromInt(false),
509 IsValidToInt(false), FromValueDecl(nullptr), ToValueDecl(nullptr),
510 FromAddressOf(false), ToAddressOf(false), FromDefault(false),
511 ToDefault(false), Same(false) {}
514 /// FlatTree - A flattened tree used to store the DiffNodes.
515 SmallVector<DiffNode, 16> FlatTree;
517 /// CurrentNode - The index of the current node being used.
518 unsigned CurrentNode;
520 /// NextFreeNode - The index of the next unused node. Used when creating
522 unsigned NextFreeNode;
524 /// ReadNode - The index of the current node being read.
529 CurrentNode(0), NextFreeNode(1) {
530 FlatTree.push_back(DiffNode());
533 // Node writing functions.
534 /// SetNode - Sets FromTD and ToTD of the current node.
535 void SetNode(TemplateDecl *FromTD, TemplateDecl *ToTD) {
536 FlatTree[CurrentNode].FromTD = FromTD;
537 FlatTree[CurrentNode].ToTD = ToTD;
540 /// SetNode - Sets FromType and ToType of the current node.
541 void SetNode(QualType FromType, QualType ToType) {
542 FlatTree[CurrentNode].FromType = FromType;
543 FlatTree[CurrentNode].ToType = ToType;
546 /// SetNode - Set FromExpr and ToExpr of the current node.
547 void SetNode(Expr *FromExpr, Expr *ToExpr) {
548 FlatTree[CurrentNode].FromExpr = FromExpr;
549 FlatTree[CurrentNode].ToExpr = ToExpr;
552 /// SetNode - Set FromInt and ToInt of the current node.
553 void SetNode(llvm::APSInt FromInt, llvm::APSInt ToInt,
554 bool IsValidFromInt, bool IsValidToInt) {
555 FlatTree[CurrentNode].FromInt = FromInt;
556 FlatTree[CurrentNode].ToInt = ToInt;
557 FlatTree[CurrentNode].IsValidFromInt = IsValidFromInt;
558 FlatTree[CurrentNode].IsValidToInt = IsValidToInt;
561 /// SetNode - Set FromQual and ToQual of the current node.
562 void SetNode(Qualifiers FromQual, Qualifiers ToQual) {
563 FlatTree[CurrentNode].FromQual = FromQual;
564 FlatTree[CurrentNode].ToQual = ToQual;
567 /// SetNode - Set FromValueDecl and ToValueDecl of the current node.
568 void SetNode(ValueDecl *FromValueDecl, ValueDecl *ToValueDecl,
569 bool FromAddressOf, bool ToAddressOf) {
570 FlatTree[CurrentNode].FromValueDecl = FromValueDecl;
571 FlatTree[CurrentNode].ToValueDecl = ToValueDecl;
572 FlatTree[CurrentNode].FromAddressOf = FromAddressOf;
573 FlatTree[CurrentNode].ToAddressOf = ToAddressOf;
576 /// SetSame - Sets the same flag of the current node.
577 void SetSame(bool Same) {
578 FlatTree[CurrentNode].Same = Same;
581 /// SetNullPtr - Sets the NullPtr flags of the current node.
582 void SetNullPtr(bool FromNullPtr, bool ToNullPtr) {
583 FlatTree[CurrentNode].FromNullPtr = FromNullPtr;
584 FlatTree[CurrentNode].ToNullPtr = ToNullPtr;
587 /// SetDefault - Sets FromDefault and ToDefault flags of the current node.
588 void SetDefault(bool FromDefault, bool ToDefault) {
589 FlatTree[CurrentNode].FromDefault = FromDefault;
590 FlatTree[CurrentNode].ToDefault = ToDefault;
593 /// SetKind - Sets the current node's type.
594 void SetKind(DiffKind Kind) {
595 FlatTree[CurrentNode].Kind = Kind;
598 /// Up - Changes the node to the parent of the current node.
600 CurrentNode = FlatTree[CurrentNode].ParentNode;
603 /// AddNode - Adds a child node to the current node, then sets that node
604 /// node as the current node.
606 FlatTree.push_back(DiffNode(CurrentNode));
607 DiffNode &Node = FlatTree[CurrentNode];
608 if (Node.ChildNode == 0) {
609 // If a child node doesn't exist, add one.
610 Node.ChildNode = NextFreeNode;
612 // If a child node exists, find the last child node and add a
615 for (i = Node.ChildNode; FlatTree[i].NextNode != 0;
616 i = FlatTree[i].NextNode) {
618 FlatTree[i].NextNode = NextFreeNode;
620 CurrentNode = NextFreeNode;
624 // Node reading functions.
625 /// StartTraverse - Prepares the tree for recursive traversal.
626 void StartTraverse() {
628 CurrentNode = NextFreeNode;
632 /// Parent - Move the current read node to its parent.
634 ReadNode = FlatTree[ReadNode].ParentNode;
637 /// GetNode - Gets the FromType and ToType.
638 void GetNode(QualType &FromType, QualType &ToType) {
639 FromType = FlatTree[ReadNode].FromType;
640 ToType = FlatTree[ReadNode].ToType;
643 /// GetNode - Gets the FromExpr and ToExpr.
644 void GetNode(Expr *&FromExpr, Expr *&ToExpr) {
645 FromExpr = FlatTree[ReadNode].FromExpr;
646 ToExpr = FlatTree[ReadNode].ToExpr;
649 /// GetNode - Gets the FromTD and ToTD.
650 void GetNode(TemplateDecl *&FromTD, TemplateDecl *&ToTD) {
651 FromTD = FlatTree[ReadNode].FromTD;
652 ToTD = FlatTree[ReadNode].ToTD;
655 /// GetNode - Gets the FromInt and ToInt.
656 void GetNode(llvm::APSInt &FromInt, llvm::APSInt &ToInt,
657 bool &IsValidFromInt, bool &IsValidToInt) {
658 FromInt = FlatTree[ReadNode].FromInt;
659 ToInt = FlatTree[ReadNode].ToInt;
660 IsValidFromInt = FlatTree[ReadNode].IsValidFromInt;
661 IsValidToInt = FlatTree[ReadNode].IsValidToInt;
664 /// GetNode - Gets the FromQual and ToQual.
665 void GetNode(Qualifiers &FromQual, Qualifiers &ToQual) {
666 FromQual = FlatTree[ReadNode].FromQual;
667 ToQual = FlatTree[ReadNode].ToQual;
670 /// GetNode - Gets the FromValueDecl and ToValueDecl.
671 void GetNode(ValueDecl *&FromValueDecl, ValueDecl *&ToValueDecl,
672 bool &FromAddressOf, bool &ToAddressOf) {
673 FromValueDecl = FlatTree[ReadNode].FromValueDecl;
674 ToValueDecl = FlatTree[ReadNode].ToValueDecl;
675 FromAddressOf = FlatTree[ReadNode].FromAddressOf;
676 ToAddressOf = FlatTree[ReadNode].ToAddressOf;
679 /// NodeIsSame - Returns true the arguments are the same.
681 return FlatTree[ReadNode].Same;
684 /// HasChildrend - Returns true if the node has children.
686 return FlatTree[ReadNode].ChildNode != 0;
689 /// MoveToChild - Moves from the current node to its child.
691 ReadNode = FlatTree[ReadNode].ChildNode;
694 /// AdvanceSibling - If there is a next sibling, advance to it and return
695 /// true. Otherwise, return false.
696 bool AdvanceSibling() {
697 if (FlatTree[ReadNode].NextNode == 0)
700 ReadNode = FlatTree[ReadNode].NextNode;
704 /// HasNextSibling - Return true if the node has a next sibling.
705 bool HasNextSibling() {
706 return FlatTree[ReadNode].NextNode != 0;
709 /// FromNullPtr - Returns true if the from argument is null.
711 return FlatTree[ReadNode].FromNullPtr;
714 /// ToNullPtr - Returns true if the to argument is null.
716 return FlatTree[ReadNode].ToNullPtr;
719 /// FromDefault - Return true if the from argument is the default.
721 return FlatTree[ReadNode].FromDefault;
724 /// ToDefault - Return true if the to argument is the default.
726 return FlatTree[ReadNode].ToDefault;
729 /// Empty - Returns true if the tree has no information.
731 return GetKind() == Invalid;
734 /// GetKind - Returns the current node's type.
736 return FlatTree[ReadNode].Kind;
742 /// TSTiterator - an iterator that is used to enter a
743 /// TemplateSpecializationType and read TemplateArguments inside template
744 /// parameter packs in order with the rest of the TemplateArguments.
746 typedef const TemplateArgument& reference;
747 typedef const TemplateArgument* pointer;
749 /// TST - the template specialization whose arguments this iterator
751 const TemplateSpecializationType *TST;
753 /// DesugarTST - desugared template specialization used to extract
754 /// default argument information
755 const TemplateSpecializationType *DesugarTST;
757 /// Index - the index of the template argument in TST.
760 /// CurrentTA - if CurrentTA is not the same as EndTA, then CurrentTA
761 /// points to a TemplateArgument within a parameter pack.
762 TemplateArgument::pack_iterator CurrentTA;
764 /// EndTA - the end iterator of a parameter pack
765 TemplateArgument::pack_iterator EndTA;
767 /// TSTiterator - Constructs an iterator and sets it to the first template
769 TSTiterator(ASTContext &Context, const TemplateSpecializationType *TST)
771 DesugarTST(GetTemplateSpecializationType(Context, TST->desugar())),
772 Index(0), CurrentTA(nullptr), EndTA(nullptr) {
775 // Set to first template argument. If not a parameter pack, done.
776 TemplateArgument TA = TST->getArg(0);
777 if (TA.getKind() != TemplateArgument::Pack) return;
779 // Start looking into the parameter pack.
780 CurrentTA = TA.pack_begin();
781 EndTA = TA.pack_end();
783 // Found a valid template argument.
784 if (CurrentTA != EndTA) return;
786 // Parameter pack is empty, use the increment to get to a valid
787 // template argument.
791 /// isEnd - Returns true if the iterator is one past the end.
793 return Index >= TST->getNumArgs();
796 /// &operator++ - Increment the iterator to the next template argument.
797 TSTiterator &operator++() {
798 // After the end, Index should be the default argument position in
799 // DesugarTST, if it exists.
805 // If in a parameter pack, advance in the parameter pack.
806 if (CurrentTA != EndTA) {
808 if (CurrentTA != EndTA)
812 // Loop until a template argument is found, or the end is reached.
814 // Advance to the next template argument. Break if reached the end.
815 if (++Index == TST->getNumArgs()) break;
817 // If the TemplateArgument is not a parameter pack, done.
818 TemplateArgument TA = TST->getArg(Index);
819 if (TA.getKind() != TemplateArgument::Pack) break;
821 // Handle parameter packs.
822 CurrentTA = TA.pack_begin();
823 EndTA = TA.pack_end();
825 // If the parameter pack is empty, try to advance again.
826 if (CurrentTA != EndTA) break;
831 /// operator* - Returns the appropriate TemplateArgument.
832 reference operator*() const {
833 assert(!isEnd() && "Index exceeds number of arguments.");
834 if (CurrentTA == EndTA)
835 return TST->getArg(Index);
840 /// operator-> - Allow access to the underlying TemplateArgument.
841 pointer operator->() const {
845 /// getDesugar - Returns the deduced template argument from DesguarTST
846 reference getDesugar() const {
847 return DesugarTST->getArg(Index);
851 // These functions build up the template diff tree, including functions to
852 // retrieve and compare template arguments.
854 static const TemplateSpecializationType * GetTemplateSpecializationType(
855 ASTContext &Context, QualType Ty) {
856 if (const TemplateSpecializationType *TST =
857 Ty->getAs<TemplateSpecializationType>())
860 const RecordType *RT = Ty->getAs<RecordType>();
865 const ClassTemplateSpecializationDecl *CTSD =
866 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl());
871 Ty = Context.getTemplateSpecializationType(
872 TemplateName(CTSD->getSpecializedTemplate()),
873 CTSD->getTemplateArgs().data(),
874 CTSD->getTemplateArgs().size(),
875 Ty.getLocalUnqualifiedType().getCanonicalType());
877 return Ty->getAs<TemplateSpecializationType>();
880 /// DiffTemplate - recursively visits template arguments and stores the
881 /// argument info into a tree.
882 void DiffTemplate(const TemplateSpecializationType *FromTST,
883 const TemplateSpecializationType *ToTST) {
884 // Begin descent into diffing template tree.
885 TemplateParameterList *ParamsFrom =
886 FromTST->getTemplateName().getAsTemplateDecl()->getTemplateParameters();
887 TemplateParameterList *ParamsTo =
888 ToTST->getTemplateName().getAsTemplateDecl()->getTemplateParameters();
889 unsigned TotalArgs = 0;
890 for (TSTiterator FromIter(Context, FromTST), ToIter(Context, ToTST);
891 !FromIter.isEnd() || !ToIter.isEnd(); ++TotalArgs) {
894 // Get the parameter at index TotalArgs. If index is larger
895 // than the total number of parameters, then there is an
896 // argument pack, so re-use the last parameter.
897 unsigned ParamIndex = std::min(TotalArgs, ParamsFrom->size() - 1);
898 NamedDecl *ParamND = ParamsFrom->getParam(ParamIndex);
901 if (TemplateTypeParmDecl *DefaultTTPD =
902 dyn_cast<TemplateTypeParmDecl>(ParamND)) {
903 QualType FromType, ToType;
904 FromType = GetType(FromIter, DefaultTTPD);
905 // A forward declaration can have no default arg but the actual class
906 // can, don't mix up iterators and get the original parameter.
908 ToIter, cast<TemplateTypeParmDecl>(ParamsTo->getParam(ParamIndex)));
909 Tree.SetNode(FromType, ToType);
910 Tree.SetDefault(FromIter.isEnd() && !FromType.isNull(),
911 ToIter.isEnd() && !ToType.isNull());
912 Tree.SetKind(DiffTree::Type);
913 if (!FromType.isNull() && !ToType.isNull()) {
914 if (Context.hasSameType(FromType, ToType)) {
917 Qualifiers FromQual = FromType.getQualifiers(),
918 ToQual = ToType.getQualifiers();
919 const TemplateSpecializationType *FromArgTST =
920 GetTemplateSpecializationType(Context, FromType);
921 const TemplateSpecializationType *ToArgTST =
922 GetTemplateSpecializationType(Context, ToType);
924 if (FromArgTST && ToArgTST &&
925 hasSameTemplate(FromArgTST, ToArgTST)) {
926 FromQual -= QualType(FromArgTST, 0).getQualifiers();
927 ToQual -= QualType(ToArgTST, 0).getQualifiers();
928 Tree.SetNode(FromArgTST->getTemplateName().getAsTemplateDecl(),
929 ToArgTST->getTemplateName().getAsTemplateDecl());
930 Tree.SetNode(FromQual, ToQual);
931 Tree.SetKind(DiffTree::Template);
932 DiffTemplate(FromArgTST, ToArgTST);
938 // Handle Expressions
939 if (NonTypeTemplateParmDecl *DefaultNTTPD =
940 dyn_cast<NonTypeTemplateParmDecl>(ParamND)) {
941 Expr *FromExpr = nullptr, *ToExpr = nullptr;
942 llvm::APSInt FromInt, ToInt;
943 ValueDecl *FromValueDecl = nullptr, *ToValueDecl = nullptr;
944 unsigned ParamWidth = 128; // Safe default
945 if (DefaultNTTPD->getType()->isIntegralOrEnumerationType())
946 ParamWidth = Context.getIntWidth(DefaultNTTPD->getType());
947 bool HasFromInt = !FromIter.isEnd() &&
948 FromIter->getKind() == TemplateArgument::Integral;
949 bool HasToInt = !ToIter.isEnd() &&
950 ToIter->getKind() == TemplateArgument::Integral;
951 bool HasFromValueDecl =
953 FromIter->getKind() == TemplateArgument::Declaration;
954 bool HasToValueDecl =
956 ToIter->getKind() == TemplateArgument::Declaration;
957 bool FromNullPtr = !FromIter.isEnd() &&
958 FromIter->getKind() == TemplateArgument::NullPtr;
960 !ToIter.isEnd() && ToIter->getKind() == TemplateArgument::NullPtr;
962 assert(((!HasFromInt && !HasToInt) ||
963 (!HasFromValueDecl && !HasToValueDecl)) &&
964 "Template argument cannot be both integer and declaration");
967 FromInt = FromIter->getAsIntegral();
968 else if (HasFromValueDecl)
969 FromValueDecl = FromIter->getAsDecl();
970 else if (!FromNullPtr)
971 FromExpr = GetExpr(FromIter, DefaultNTTPD);
974 ToInt = ToIter->getAsIntegral();
975 else if (HasToValueDecl)
976 ToValueDecl = ToIter->getAsDecl();
978 ToExpr = GetExpr(ToIter, DefaultNTTPD);
980 bool TemplateArgumentIsPointerType =
981 DefaultNTTPD->getType()->isPointerType();
982 if (FromExpr && TemplateArgumentIsPointerType) {
983 FromNullPtr = CheckForNullPtr(FromExpr);
985 if (ToExpr && TemplateArgumentIsPointerType) {
986 ToNullPtr = CheckForNullPtr(ToExpr);
989 if (!HasFromInt && !HasToInt && !HasFromValueDecl && !HasToValueDecl) {
990 Tree.SetNode(FromExpr, ToExpr);
991 Tree.SetDefault(FromIter.isEnd() && FromExpr,
992 ToIter.isEnd() && ToExpr);
993 if (DefaultNTTPD->getType()->isIntegralOrEnumerationType()) {
995 HasFromInt = GetInt(FromIter, FromExpr, FromInt);
997 HasToInt = GetInt(ToIter, ToExpr, ToInt);
999 if (HasFromInt && HasToInt) {
1000 Tree.SetNode(FromInt, ToInt, HasFromInt, HasToInt);
1001 Tree.SetSame(IsSameConvertedInt(ParamWidth, FromInt, ToInt));
1002 Tree.SetKind(DiffTree::Integer);
1003 } else if (HasFromInt || HasToInt) {
1004 Tree.SetNode(FromInt, ToInt, HasFromInt, HasToInt);
1005 Tree.SetSame(false);
1006 Tree.SetKind(DiffTree::Integer);
1008 Tree.SetSame(IsEqualExpr(Context, ParamWidth, FromExpr, ToExpr) ||
1009 (FromNullPtr && ToNullPtr));
1010 Tree.SetNullPtr(FromNullPtr, ToNullPtr);
1011 Tree.SetKind(DiffTree::Expression);
1013 } else if (HasFromInt || HasToInt) {
1014 if (!HasFromInt && FromExpr)
1015 HasFromInt = GetInt(FromIter, FromExpr, FromInt);
1016 if (!HasToInt && ToExpr)
1017 HasToInt = GetInt(ToIter, ToExpr, ToInt);
1018 Tree.SetNode(FromInt, ToInt, HasFromInt, HasToInt);
1019 Tree.SetSame(IsSameConvertedInt(ParamWidth, FromInt, ToInt));
1020 Tree.SetDefault(FromIter.isEnd() && HasFromInt,
1021 ToIter.isEnd() && HasToInt);
1022 Tree.SetKind(DiffTree::Integer);
1024 if (!HasFromValueDecl && FromExpr)
1025 FromValueDecl = GetValueDecl(FromIter, FromExpr);
1026 if (!HasToValueDecl && ToExpr)
1027 ToValueDecl = GetValueDecl(ToIter, ToExpr);
1028 QualType ArgumentType = DefaultNTTPD->getType();
1029 bool FromAddressOf = false;
1030 if (FromValueDecl) {
1032 if (UnaryOperator *UO =
1033 dyn_cast<UnaryOperator>(FromExpr->IgnoreParens())) {
1034 if (UO->getOpcode() == UO_AddrOf)
1035 FromAddressOf = true;
1038 if (!ArgumentType->isReferenceType()) {
1039 FromAddressOf = true;
1043 bool ToAddressOf = false;
1046 if (UnaryOperator *UO =
1047 dyn_cast<UnaryOperator>(ToExpr->IgnoreParens())) {
1048 if (UO->getOpcode() == UO_AddrOf) {
1053 if (!ArgumentType->isReferenceType()) {
1058 Tree.SetNullPtr(FromNullPtr, ToNullPtr);
1059 Tree.SetNode(FromValueDecl, ToValueDecl, FromAddressOf, ToAddressOf);
1060 Tree.SetSame(FromValueDecl && ToValueDecl &&
1061 FromValueDecl->getCanonicalDecl() ==
1062 ToValueDecl->getCanonicalDecl());
1063 Tree.SetDefault(FromIter.isEnd() && FromValueDecl,
1064 ToIter.isEnd() && ToValueDecl);
1065 Tree.SetKind(DiffTree::Declaration);
1070 if (TemplateTemplateParmDecl *DefaultTTPD =
1071 dyn_cast<TemplateTemplateParmDecl>(ParamND)) {
1072 TemplateDecl *FromDecl, *ToDecl;
1073 FromDecl = GetTemplateDecl(FromIter, DefaultTTPD);
1074 ToDecl = GetTemplateDecl(ToIter, DefaultTTPD);
1075 Tree.SetNode(FromDecl, ToDecl);
1077 FromDecl && ToDecl &&
1078 FromDecl->getCanonicalDecl() == ToDecl->getCanonicalDecl());
1079 Tree.SetDefault(FromIter.isEnd() && FromDecl, ToIter.isEnd() && ToDecl);
1080 Tree.SetKind(DiffTree::TemplateTemplate);
1089 /// makeTemplateList - Dump every template alias into the vector.
1090 static void makeTemplateList(
1091 SmallVectorImpl<const TemplateSpecializationType *> &TemplateList,
1092 const TemplateSpecializationType *TST) {
1094 TemplateList.push_back(TST);
1095 if (!TST->isTypeAlias())
1097 TST = TST->getAliasedType()->getAs<TemplateSpecializationType>();
1101 /// hasSameBaseTemplate - Returns true when the base templates are the same,
1102 /// even if the template arguments are not.
1103 static bool hasSameBaseTemplate(const TemplateSpecializationType *FromTST,
1104 const TemplateSpecializationType *ToTST) {
1105 return FromTST->getTemplateName().getAsTemplateDecl()->getCanonicalDecl() ==
1106 ToTST->getTemplateName().getAsTemplateDecl()->getCanonicalDecl();
1109 /// hasSameTemplate - Returns true if both types are specialized from the
1110 /// same template declaration. If they come from different template aliases,
1111 /// do a parallel ascension search to determine the highest template alias in
1112 /// common and set the arguments to them.
1113 static bool hasSameTemplate(const TemplateSpecializationType *&FromTST,
1114 const TemplateSpecializationType *&ToTST) {
1115 // Check the top templates if they are the same.
1116 if (hasSameBaseTemplate(FromTST, ToTST))
1119 // Create vectors of template aliases.
1120 SmallVector<const TemplateSpecializationType*, 1> FromTemplateList,
1123 makeTemplateList(FromTemplateList, FromTST);
1124 makeTemplateList(ToTemplateList, ToTST);
1126 SmallVectorImpl<const TemplateSpecializationType *>::reverse_iterator
1127 FromIter = FromTemplateList.rbegin(), FromEnd = FromTemplateList.rend(),
1128 ToIter = ToTemplateList.rbegin(), ToEnd = ToTemplateList.rend();
1130 // Check if the lowest template types are the same. If not, return.
1131 if (!hasSameBaseTemplate(*FromIter, *ToIter))
1134 // Begin searching up the template aliases. The bottom most template
1135 // matches so move up until one pair does not match. Use the template
1136 // right before that one.
1137 for (; FromIter != FromEnd && ToIter != ToEnd; ++FromIter, ++ToIter) {
1138 if (!hasSameBaseTemplate(*FromIter, *ToIter))
1142 FromTST = FromIter[-1];
1148 /// GetType - Retrieves the template type arguments, including default
1150 QualType GetType(const TSTiterator &Iter, TemplateTypeParmDecl *DefaultTTPD) {
1151 bool isVariadic = DefaultTTPD->isParameterPack();
1154 return Iter->getAsType();
1158 QualType ArgType = DefaultTTPD->getDefaultArgument();
1159 if (ArgType->isDependentType())
1160 return Iter.getDesugar().getAsType();
1165 /// GetExpr - Retrieves the template expression argument, including default
1167 Expr *GetExpr(const TSTiterator &Iter, NonTypeTemplateParmDecl *DefaultNTTPD) {
1168 Expr *ArgExpr = nullptr;
1169 bool isVariadic = DefaultNTTPD->isParameterPack();
1172 ArgExpr = Iter->getAsExpr();
1173 else if (!isVariadic)
1174 ArgExpr = DefaultNTTPD->getDefaultArgument();
1177 while (SubstNonTypeTemplateParmExpr *SNTTPE =
1178 dyn_cast<SubstNonTypeTemplateParmExpr>(ArgExpr))
1179 ArgExpr = SNTTPE->getReplacement();
1184 /// GetInt - Retrieves the template integer argument, including evaluating
1185 /// default arguments.
1186 bool GetInt(const TSTiterator &Iter, Expr *ArgExpr, llvm::APInt &Int) {
1187 // Default, value-depenedent expressions require fetching
1188 // from the desugared TemplateArgument, otherwise expression needs to
1190 if (Iter.isEnd() && ArgExpr->isValueDependent()) {
1191 switch (Iter.getDesugar().getKind()) {
1192 case TemplateArgument::Integral:
1193 Int = Iter.getDesugar().getAsIntegral();
1195 case TemplateArgument::Expression:
1196 ArgExpr = Iter.getDesugar().getAsExpr();
1197 Int = ArgExpr->EvaluateKnownConstInt(Context);
1200 llvm_unreachable("Unexpected template argument kind");
1202 } else if (ArgExpr->isEvaluatable(Context)) {
1203 Int = ArgExpr->EvaluateKnownConstInt(Context);
1210 /// GetValueDecl - Retrieves the template Decl argument, including
1211 /// default expression argument.
1212 ValueDecl *GetValueDecl(const TSTiterator &Iter, Expr *ArgExpr) {
1213 // Default, value-depenedent expressions require fetching
1214 // from the desugared TemplateArgument
1215 if (Iter.isEnd() && ArgExpr->isValueDependent())
1216 switch (Iter.getDesugar().getKind()) {
1217 case TemplateArgument::Declaration:
1218 return Iter.getDesugar().getAsDecl();
1219 case TemplateArgument::Expression:
1220 ArgExpr = Iter.getDesugar().getAsExpr();
1221 return cast<DeclRefExpr>(ArgExpr)->getDecl();
1223 llvm_unreachable("Unexpected template argument kind");
1225 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ArgExpr);
1227 UnaryOperator *UO = dyn_cast<UnaryOperator>(ArgExpr->IgnoreParens());
1230 DRE = cast<DeclRefExpr>(UO->getSubExpr());
1233 return DRE->getDecl();
1236 /// CheckForNullPtr - returns true if the expression can be evaluated as
1238 bool CheckForNullPtr(Expr *E) {
1239 assert(E && "Expected expression");
1241 E = E->IgnoreParenCasts();
1242 if (E->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull))
1245 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E);
1249 VarDecl *VD = dyn_cast<VarDecl>(DRE->getDecl());
1250 if (!VD || !VD->hasInit())
1253 return VD->getInit()->IgnoreParenCasts()->isNullPointerConstant(
1254 Context, Expr::NPC_ValueDependentIsNull);
1257 /// GetTemplateDecl - Retrieves the template template arguments, including
1258 /// default arguments.
1259 TemplateDecl *GetTemplateDecl(const TSTiterator &Iter,
1260 TemplateTemplateParmDecl *DefaultTTPD) {
1261 bool isVariadic = DefaultTTPD->isParameterPack();
1263 TemplateArgument TA = DefaultTTPD->getDefaultArgument().getArgument();
1264 TemplateDecl *DefaultTD = nullptr;
1265 if (TA.getKind() != TemplateArgument::Null)
1266 DefaultTD = TA.getAsTemplate().getAsTemplateDecl();
1269 return Iter->getAsTemplate().getAsTemplateDecl();
1276 /// IsSameConvertedInt - Returns true if both integers are equal when
1277 /// converted to an integer type with the given width.
1278 static bool IsSameConvertedInt(unsigned Width, const llvm::APSInt &X,
1279 const llvm::APSInt &Y) {
1280 llvm::APInt ConvertedX = X.extOrTrunc(Width);
1281 llvm::APInt ConvertedY = Y.extOrTrunc(Width);
1282 return ConvertedX == ConvertedY;
1285 /// IsEqualExpr - Returns true if the expressions evaluate to the same value.
1286 static bool IsEqualExpr(ASTContext &Context, unsigned ParamWidth,
1287 Expr *FromExpr, Expr *ToExpr) {
1288 if (FromExpr == ToExpr)
1291 if (!FromExpr || !ToExpr)
1294 DeclRefExpr *FromDRE = dyn_cast<DeclRefExpr>(FromExpr->IgnoreParens()),
1295 *ToDRE = dyn_cast<DeclRefExpr>(ToExpr->IgnoreParens());
1297 if (FromDRE || ToDRE) {
1298 if (!FromDRE || !ToDRE)
1300 return FromDRE->getDecl() == ToDRE->getDecl();
1303 Expr::EvalResult FromResult, ToResult;
1304 if (!FromExpr->EvaluateAsRValue(FromResult, Context) ||
1305 !ToExpr->EvaluateAsRValue(ToResult, Context)) {
1306 llvm::FoldingSetNodeID FromID, ToID;
1307 FromExpr->Profile(FromID, Context, true);
1308 ToExpr->Profile(ToID, Context, true);
1309 return FromID == ToID;
1312 APValue &FromVal = FromResult.Val;
1313 APValue &ToVal = ToResult.Val;
1315 if (FromVal.getKind() != ToVal.getKind()) return false;
1317 switch (FromVal.getKind()) {
1319 return IsSameConvertedInt(ParamWidth, FromVal.getInt(), ToVal.getInt());
1320 case APValue::LValue: {
1321 APValue::LValueBase FromBase = FromVal.getLValueBase();
1322 APValue::LValueBase ToBase = ToVal.getLValueBase();
1323 if (FromBase.isNull() && ToBase.isNull())
1325 if (FromBase.isNull() || ToBase.isNull())
1327 return FromBase.get<const ValueDecl*>() ==
1328 ToBase.get<const ValueDecl*>();
1330 case APValue::MemberPointer:
1331 return FromVal.getMemberPointerDecl() == ToVal.getMemberPointerDecl();
1333 llvm_unreachable("Unknown template argument expression.");
1337 // These functions converts the tree representation of the template
1338 // differences into the internal character vector.
1340 /// TreeToString - Converts the Tree object into a character stream which
1341 /// will later be turned into the output string.
1342 void TreeToString(int Indent = 1) {
1345 OS.indent(2 * Indent);
1349 // Handle cases where the difference is not templates with different
1351 switch (Tree.GetKind()) {
1352 case DiffTree::Invalid:
1353 llvm_unreachable("Template diffing failed with bad DiffNode");
1354 case DiffTree::Type: {
1355 QualType FromType, ToType;
1356 Tree.GetNode(FromType, ToType);
1357 PrintTypeNames(FromType, ToType, Tree.FromDefault(), Tree.ToDefault(),
1361 case DiffTree::Expression: {
1362 Expr *FromExpr, *ToExpr;
1363 Tree.GetNode(FromExpr, ToExpr);
1364 PrintExpr(FromExpr, ToExpr, Tree.FromNullPtr(), Tree.ToNullPtr(),
1365 Tree.FromDefault(), Tree.ToDefault(), Tree.NodeIsSame());
1368 case DiffTree::TemplateTemplate: {
1369 TemplateDecl *FromTD, *ToTD;
1370 Tree.GetNode(FromTD, ToTD);
1371 PrintTemplateTemplate(FromTD, ToTD, Tree.FromDefault(),
1372 Tree.ToDefault(), Tree.NodeIsSame());
1375 case DiffTree::Integer: {
1376 llvm::APSInt FromInt, ToInt;
1377 Expr *FromExpr, *ToExpr;
1378 bool IsValidFromInt, IsValidToInt;
1379 Tree.GetNode(FromExpr, ToExpr);
1380 Tree.GetNode(FromInt, ToInt, IsValidFromInt, IsValidToInt);
1381 PrintAPSInt(FromInt, ToInt, IsValidFromInt, IsValidToInt,
1382 FromExpr, ToExpr, Tree.FromDefault(), Tree.ToDefault(),
1386 case DiffTree::Declaration: {
1387 ValueDecl *FromValueDecl, *ToValueDecl;
1388 bool FromAddressOf, ToAddressOf;
1389 Tree.GetNode(FromValueDecl, ToValueDecl, FromAddressOf, ToAddressOf);
1390 PrintValueDecl(FromValueDecl, ToValueDecl, FromAddressOf, ToAddressOf,
1391 Tree.FromNullPtr(), Tree.ToNullPtr(), Tree.FromDefault(),
1392 Tree.ToDefault(), Tree.NodeIsSame());
1395 case DiffTree::Template: {
1396 // Node is root of template. Recurse on children.
1397 TemplateDecl *FromTD, *ToTD;
1398 Tree.GetNode(FromTD, ToTD);
1400 if (!Tree.HasChildren()) {
1401 // If we're dealing with a template specialization with zero
1402 // arguments, there are no children; special-case this.
1403 OS << FromTD->getNameAsString() << "<>";
1407 Qualifiers FromQual, ToQual;
1408 Tree.GetNode(FromQual, ToQual);
1409 PrintQualifiers(FromQual, ToQual);
1411 OS << FromTD->getNameAsString() << '<';
1413 unsigned NumElideArgs = 0;
1416 if (Tree.NodeIsSame()) {
1420 if (NumElideArgs > 0) {
1421 PrintElideArgs(NumElideArgs, Indent);
1426 TreeToString(Indent);
1427 if (Tree.HasNextSibling())
1429 } while (Tree.AdvanceSibling());
1430 if (NumElideArgs > 0)
1431 PrintElideArgs(NumElideArgs, Indent);
1440 // To signal to the text printer that a certain text needs to be bolded,
1441 // a special character is injected into the character stream which the
1442 // text printer will later strip out.
1444 /// Bold - Start bolding text.
1446 assert(!IsBold && "Attempting to bold text that is already bold.");
1449 OS << ToggleHighlight;
1452 /// Unbold - Stop bolding text.
1454 assert(IsBold && "Attempting to remove bold from unbold text.");
1457 OS << ToggleHighlight;
1460 // Functions to print out the arguments and highlighting the difference.
1462 /// PrintTypeNames - prints the typenames, bolding differences. Will detect
1463 /// typenames that are the same and attempt to disambiguate them by using
1464 /// canonical typenames.
1465 void PrintTypeNames(QualType FromType, QualType ToType,
1466 bool FromDefault, bool ToDefault, bool Same) {
1467 assert((!FromType.isNull() || !ToType.isNull()) &&
1468 "Only one template argument may be missing.");
1471 OS << FromType.getAsString(Policy);
1475 if (!FromType.isNull() && !ToType.isNull() &&
1476 FromType.getLocalUnqualifiedType() ==
1477 ToType.getLocalUnqualifiedType()) {
1478 Qualifiers FromQual = FromType.getLocalQualifiers(),
1479 ToQual = ToType.getLocalQualifiers();
1480 PrintQualifiers(FromQual, ToQual);
1481 FromType.getLocalUnqualifiedType().print(OS, Policy);
1485 std::string FromTypeStr = FromType.isNull() ? "(no argument)"
1486 : FromType.getAsString(Policy);
1487 std::string ToTypeStr = ToType.isNull() ? "(no argument)"
1488 : ToType.getAsString(Policy);
1489 // Switch to canonical typename if it is better.
1490 // TODO: merge this with other aka printing above.
1491 if (FromTypeStr == ToTypeStr) {
1492 std::string FromCanTypeStr =
1493 FromType.getCanonicalType().getAsString(Policy);
1494 std::string ToCanTypeStr = ToType.getCanonicalType().getAsString(Policy);
1495 if (FromCanTypeStr != ToCanTypeStr) {
1496 FromTypeStr = FromCanTypeStr;
1497 ToTypeStr = ToCanTypeStr;
1501 if (PrintTree) OS << '[';
1502 OS << (FromDefault ? "(default) " : "");
1507 OS << " != " << (ToDefault ? "(default) " : "");
1516 /// PrintExpr - Prints out the expr template arguments, highlighting argument
1518 void PrintExpr(const Expr *FromExpr, const Expr *ToExpr, bool FromNullPtr,
1519 bool ToNullPtr, bool FromDefault, bool ToDefault, bool Same) {
1520 assert((FromExpr || ToExpr) &&
1521 "Only one template argument may be missing.");
1523 PrintExpr(FromExpr, FromNullPtr);
1524 } else if (!PrintTree) {
1525 OS << (FromDefault ? "(default) " : "");
1527 PrintExpr(FromExpr, FromNullPtr);
1530 OS << (FromDefault ? "[(default) " : "[");
1532 PrintExpr(FromExpr, FromNullPtr);
1534 OS << " != " << (ToDefault ? "(default) " : "");
1536 PrintExpr(ToExpr, ToNullPtr);
1542 /// PrintExpr - Actual formatting and printing of expressions.
1543 void PrintExpr(const Expr *E, bool NullPtr = false) {
1545 E->printPretty(OS, nullptr, Policy);
1552 OS << "(no argument)";
1555 /// PrintTemplateTemplate - Handles printing of template template arguments,
1556 /// highlighting argument differences.
1557 void PrintTemplateTemplate(TemplateDecl *FromTD, TemplateDecl *ToTD,
1558 bool FromDefault, bool ToDefault, bool Same) {
1559 assert((FromTD || ToTD) && "Only one template argument may be missing.");
1561 std::string FromName = FromTD ? FromTD->getName() : "(no argument)";
1562 std::string ToName = ToTD ? ToTD->getName() : "(no argument)";
1563 if (FromTD && ToTD && FromName == ToName) {
1564 FromName = FromTD->getQualifiedNameAsString();
1565 ToName = ToTD->getQualifiedNameAsString();
1569 OS << "template " << FromTD->getNameAsString();
1570 } else if (!PrintTree) {
1571 OS << (FromDefault ? "(default) template " : "template ");
1576 OS << (FromDefault ? "[(default) template " : "[template ");
1580 OS << " != " << (ToDefault ? "(default) template " : "template ");
1588 /// PrintAPSInt - Handles printing of integral arguments, highlighting
1589 /// argument differences.
1590 void PrintAPSInt(llvm::APSInt FromInt, llvm::APSInt ToInt,
1591 bool IsValidFromInt, bool IsValidToInt, Expr *FromExpr,
1592 Expr *ToExpr, bool FromDefault, bool ToDefault, bool Same) {
1593 assert((IsValidFromInt || IsValidToInt) &&
1594 "Only one integral argument may be missing.");
1597 OS << FromInt.toString(10);
1598 } else if (!PrintTree) {
1599 OS << (FromDefault ? "(default) " : "");
1600 PrintAPSInt(FromInt, FromExpr, IsValidFromInt);
1602 OS << (FromDefault ? "[(default) " : "[");
1603 PrintAPSInt(FromInt, FromExpr, IsValidFromInt);
1604 OS << " != " << (ToDefault ? "(default) " : "");
1605 PrintAPSInt(ToInt, ToExpr, IsValidToInt);
1610 /// PrintAPSInt - If valid, print the APSInt. If the expression is
1611 /// gives more information, print it too.
1612 void PrintAPSInt(llvm::APSInt Val, Expr *E, bool Valid) {
1615 if (HasExtraInfo(E)) {
1621 OS << Val.toString(10);
1625 OS << "(no argument)";
1630 /// HasExtraInfo - Returns true if E is not an integer literal or the
1631 /// negation of an integer literal
1632 bool HasExtraInfo(Expr *E) {
1633 if (!E) return false;
1634 if (isa<IntegerLiteral>(E)) return false;
1636 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E))
1637 if (UO->getOpcode() == UO_Minus)
1638 if (isa<IntegerLiteral>(UO->getSubExpr()))
1644 void PrintValueDecl(ValueDecl *VD, bool AddressOf, bool NullPtr) {
1648 OS << VD->getName();
1657 OS << "(no argument)";
1660 /// PrintDecl - Handles printing of Decl arguments, highlighting
1661 /// argument differences.
1662 void PrintValueDecl(ValueDecl *FromValueDecl, ValueDecl *ToValueDecl,
1663 bool FromAddressOf, bool ToAddressOf, bool FromNullPtr,
1664 bool ToNullPtr, bool FromDefault, bool ToDefault,
1666 assert((FromValueDecl || FromNullPtr || ToValueDecl || ToNullPtr) &&
1667 "Only one Decl argument may be NULL");
1670 PrintValueDecl(FromValueDecl, FromAddressOf, FromNullPtr);
1671 } else if (!PrintTree) {
1672 OS << (FromDefault ? "(default) " : "");
1674 PrintValueDecl(FromValueDecl, FromAddressOf, FromNullPtr);
1677 OS << (FromDefault ? "[(default) " : "[");
1679 PrintValueDecl(FromValueDecl, FromAddressOf, FromNullPtr);
1681 OS << " != " << (ToDefault ? "(default) " : "");
1683 PrintValueDecl(ToValueDecl, ToAddressOf, ToNullPtr);
1690 // Prints the appropriate placeholder for elided template arguments.
1691 void PrintElideArgs(unsigned NumElideArgs, unsigned Indent) {
1694 for (unsigned i = 0; i < Indent; ++i)
1697 if (NumElideArgs == 0) return;
1698 if (NumElideArgs == 1)
1701 OS << "[" << NumElideArgs << " * ...]";
1704 // Prints and highlights differences in Qualifiers.
1705 void PrintQualifiers(Qualifiers FromQual, Qualifiers ToQual) {
1706 // Both types have no qualifiers
1707 if (FromQual.empty() && ToQual.empty())
1710 // Both types have same qualifiers
1711 if (FromQual == ToQual) {
1712 PrintQualifier(FromQual, /*ApplyBold*/false);
1716 // Find common qualifiers and strip them from FromQual and ToQual.
1717 Qualifiers CommonQual = Qualifiers::removeCommonQualifiers(FromQual,
1720 // The qualifiers are printed before the template name.
1722 // The common qualifiers are printed. Then, qualifiers only in this type
1723 // are printed and highlighted. Finally, qualifiers only in the other
1724 // type are printed and highlighted inside parentheses after "missing".
1726 // Qualifiers are printed next to each other, inside brackets, and
1727 // separated by "!=". The printing order is:
1728 // common qualifiers, highlighted from qualifiers, "!=",
1729 // common qualifiers, highlighted to qualifiers
1732 if (CommonQual.empty() && FromQual.empty()) {
1734 OS << "(no qualifiers) ";
1737 PrintQualifier(CommonQual, /*ApplyBold*/false);
1738 PrintQualifier(FromQual, /*ApplyBold*/true);
1741 if (CommonQual.empty() && ToQual.empty()) {
1743 OS << "(no qualifiers)";
1746 PrintQualifier(CommonQual, /*ApplyBold*/false,
1747 /*appendSpaceIfNonEmpty*/!ToQual.empty());
1748 PrintQualifier(ToQual, /*ApplyBold*/true,
1749 /*appendSpaceIfNonEmpty*/false);
1753 PrintQualifier(CommonQual, /*ApplyBold*/false);
1754 PrintQualifier(FromQual, /*ApplyBold*/true);
1758 void PrintQualifier(Qualifiers Q, bool ApplyBold,
1759 bool AppendSpaceIfNonEmpty = true) {
1760 if (Q.empty()) return;
1761 if (ApplyBold) Bold();
1762 Q.print(OS, Policy, AppendSpaceIfNonEmpty);
1763 if (ApplyBold) Unbold();
1768 TemplateDiff(raw_ostream &OS, ASTContext &Context, QualType FromType,
1769 QualType ToType, bool PrintTree, bool PrintFromType,
1770 bool ElideType, bool ShowColor)
1772 Policy(Context.getLangOpts()),
1773 ElideType(ElideType),
1774 PrintTree(PrintTree),
1775 ShowColor(ShowColor),
1776 // When printing a single type, the FromType is the one printed.
1777 FromType(PrintFromType ? FromType : ToType),
1778 ToType(PrintFromType ? ToType : FromType),
1783 /// DiffTemplate - Start the template type diffing.
1784 void DiffTemplate() {
1785 Qualifiers FromQual = FromType.getQualifiers(),
1786 ToQual = ToType.getQualifiers();
1788 const TemplateSpecializationType *FromOrigTST =
1789 GetTemplateSpecializationType(Context, FromType);
1790 const TemplateSpecializationType *ToOrigTST =
1791 GetTemplateSpecializationType(Context, ToType);
1793 // Only checking templates.
1794 if (!FromOrigTST || !ToOrigTST)
1797 // Different base templates.
1798 if (!hasSameTemplate(FromOrigTST, ToOrigTST)) {
1802 FromQual -= QualType(FromOrigTST, 0).getQualifiers();
1803 ToQual -= QualType(ToOrigTST, 0).getQualifiers();
1804 Tree.SetNode(FromType, ToType);
1805 Tree.SetNode(FromQual, ToQual);
1806 Tree.SetKind(DiffTree::Template);
1808 // Same base template, but different arguments.
1809 Tree.SetNode(FromOrigTST->getTemplateName().getAsTemplateDecl(),
1810 ToOrigTST->getTemplateName().getAsTemplateDecl());
1812 DiffTemplate(FromOrigTST, ToOrigTST);
1815 /// Emit - When the two types given are templated types with the same
1816 /// base template, a string representation of the type difference will be
1817 /// emitted to the stream and return true. Otherwise, return false.
1819 Tree.StartTraverse();
1824 assert(!IsBold && "Bold is applied to end of string.");
1827 }; // end class TemplateDiff
1830 /// FormatTemplateTypeDiff - A helper static function to start the template
1831 /// diff and return the properly formatted string. Returns true if the diff
1833 static bool FormatTemplateTypeDiff(ASTContext &Context, QualType FromType,
1834 QualType ToType, bool PrintTree,
1835 bool PrintFromType, bool ElideType,
1836 bool ShowColors, raw_ostream &OS) {
1838 PrintFromType = true;
1839 TemplateDiff TD(OS, Context, FromType, ToType, PrintTree, PrintFromType,
1840 ElideType, ShowColors);