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/DeclObjC.h"
16 #include "clang/AST/DeclTemplate.h"
17 #include "clang/AST/ExprCXX.h"
18 #include "clang/AST/TemplateBase.h"
19 #include "clang/AST/Type.h"
20 #include "llvm/ADT/SmallString.h"
21 #include "llvm/Support/raw_ostream.h"
23 using namespace clang;
25 // Returns a desugared version of the QualType, and marks ShouldAKA as true
26 // whenever we remove significant sugar from the type.
27 static QualType Desugar(ASTContext &Context, QualType QT, bool &ShouldAKA) {
28 QualifierCollector QC;
31 const Type *Ty = QC.strip(QT);
33 // Don't aka just because we saw an elaborated type...
34 if (const ElaboratedType *ET = dyn_cast<ElaboratedType>(Ty)) {
38 // ... or a paren type ...
39 if (const ParenType *PT = dyn_cast<ParenType>(Ty)) {
43 // ...or a substituted template type parameter ...
44 if (const SubstTemplateTypeParmType *ST =
45 dyn_cast<SubstTemplateTypeParmType>(Ty)) {
49 // ...or an attributed type...
50 if (const AttributedType *AT = dyn_cast<AttributedType>(Ty)) {
54 // ... or an auto type.
55 if (const AutoType *AT = dyn_cast<AutoType>(Ty)) {
62 // Don't desugar template specializations, unless it's an alias template.
63 if (const TemplateSpecializationType *TST
64 = dyn_cast<TemplateSpecializationType>(Ty))
65 if (!TST->isTypeAlias())
68 // Don't desugar magic Objective-C types.
69 if (QualType(Ty,0) == Context.getObjCIdType() ||
70 QualType(Ty,0) == Context.getObjCClassType() ||
71 QualType(Ty,0) == Context.getObjCSelType() ||
72 QualType(Ty,0) == Context.getObjCProtoType())
75 // Don't desugar va_list.
76 if (QualType(Ty,0) == Context.getBuiltinVaListType())
79 // Otherwise, do a single-step desugar.
82 switch (Ty->getTypeClass()) {
83 #define ABSTRACT_TYPE(Class, Base)
84 #define TYPE(Class, Base) \
86 const Class##Type *CTy = cast<Class##Type>(Ty); \
87 if (CTy->isSugared()) { \
89 Underlying = CTy->desugar(); \
93 #include "clang/AST/TypeNodes.def"
96 // If it wasn't sugared, we're done.
100 // If the desugared type is a vector type, we don't want to expand
101 // it, it will turn into an attribute mess. People want their "vec4".
102 if (isa<VectorType>(Underlying))
105 // Don't desugar through the primary typedef of an anonymous type.
106 if (const TagType *UTT = Underlying->getAs<TagType>())
107 if (const TypedefType *QTT = dyn_cast<TypedefType>(QT))
108 if (UTT->getDecl()->getTypedefNameForAnonDecl() == QTT->getDecl())
111 // Record that we actually looked through an opaque type here.
116 // If we have a pointer-like type, desugar the pointee as well.
117 // FIXME: Handle other pointer-like types.
118 if (const PointerType *Ty = QT->getAs<PointerType>()) {
119 QT = Context.getPointerType(Desugar(Context, Ty->getPointeeType(),
121 } else if (const LValueReferenceType *Ty = QT->getAs<LValueReferenceType>()) {
122 QT = Context.getLValueReferenceType(Desugar(Context, Ty->getPointeeType(),
124 } else if (const RValueReferenceType *Ty = QT->getAs<RValueReferenceType>()) {
125 QT = Context.getRValueReferenceType(Desugar(Context, Ty->getPointeeType(),
129 return QC.apply(Context, QT);
132 /// \brief Convert the given type to a string suitable for printing as part of
135 /// There are four main criteria when determining whether we should have an
136 /// a.k.a. clause when pretty-printing a type:
138 /// 1) Some types provide very minimal sugar that doesn't impede the
139 /// user's understanding --- for example, elaborated type
140 /// specifiers. If this is all the sugar we see, we don't want an
142 /// 2) Some types are technically sugared but are much more familiar
143 /// when seen in their sugared form --- for example, va_list,
144 /// vector types, and the magic Objective C types. We don't
145 /// want to desugar these, even if we do produce an a.k.a. clause.
146 /// 3) Some types may have already been desugared previously in this diagnostic.
147 /// if this is the case, doing another "aka" would just be clutter.
148 /// 4) Two different types within the same diagnostic have the same output
149 /// string. In this case, force an a.k.a with the desugared type when
150 /// doing so will provide additional information.
152 /// \param Context the context in which the type was allocated
153 /// \param Ty the type to print
154 /// \param QualTypeVals pointer values to QualTypes which are used in the
155 /// diagnostic message
157 ConvertTypeToDiagnosticString(ASTContext &Context, QualType Ty,
158 const DiagnosticsEngine::ArgumentValue *PrevArgs,
159 unsigned NumPrevArgs,
160 ArrayRef<intptr_t> QualTypeVals) {
161 // FIXME: Playing with std::string is really slow.
162 bool ForceAKA = false;
163 QualType CanTy = Ty.getCanonicalType();
164 std::string S = Ty.getAsString(Context.getPrintingPolicy());
165 std::string CanS = CanTy.getAsString(Context.getPrintingPolicy());
167 for (unsigned I = 0, E = QualTypeVals.size(); I != E; ++I) {
169 QualType::getFromOpaquePtr(reinterpret_cast<void*>(QualTypeVals[I]));
170 if (CompareTy.isNull())
173 continue; // Same types
174 QualType CompareCanTy = CompareTy.getCanonicalType();
175 if (CompareCanTy == CanTy)
176 continue; // Same canonical types
177 std::string CompareS = CompareTy.getAsString(Context.getPrintingPolicy());
179 QualType CompareDesugar = Desugar(Context, CompareTy, aka);
180 std::string CompareDesugarStr =
181 CompareDesugar.getAsString(Context.getPrintingPolicy());
182 if (CompareS != S && CompareDesugarStr != S)
183 continue; // The type string is different than the comparison string
184 // and the desugared comparison string.
185 std::string CompareCanS =
186 CompareCanTy.getAsString(Context.getPrintingPolicy());
188 if (CompareCanS == CanS)
189 continue; // No new info from canonical type
195 // Check to see if we already desugared this type in this
196 // diagnostic. If so, don't do it again.
197 bool Repeated = false;
198 for (unsigned i = 0; i != NumPrevArgs; ++i) {
199 // TODO: Handle ak_declcontext case.
200 if (PrevArgs[i].first == DiagnosticsEngine::ak_qualtype) {
201 void *Ptr = (void*)PrevArgs[i].second;
202 QualType PrevTy(QualType::getFromOpaquePtr(Ptr));
210 // Consider producing an a.k.a. clause if removing all the direct
211 // sugar gives us something "significantly different".
213 bool ShouldAKA = false;
214 QualType DesugaredTy = Desugar(Context, Ty, ShouldAKA);
215 if (ShouldAKA || ForceAKA) {
216 if (DesugaredTy == Ty) {
217 DesugaredTy = Ty.getCanonicalType();
219 std::string akaStr = DesugaredTy.getAsString(Context.getPrintingPolicy());
221 S = "'" + S + "' (aka '" + akaStr + "')";
231 static bool FormatTemplateTypeDiff(ASTContext &Context, QualType FromType,
232 QualType ToType, bool PrintTree,
233 bool PrintFromType, bool ElideType,
234 bool ShowColors, raw_ostream &OS);
236 void clang::FormatASTNodeDiagnosticArgument(
237 DiagnosticsEngine::ArgumentKind Kind,
239 const char *Modifier,
241 const char *Argument,
243 const DiagnosticsEngine::ArgumentValue *PrevArgs,
244 unsigned NumPrevArgs,
245 SmallVectorImpl<char> &Output,
247 ArrayRef<intptr_t> QualTypeVals) {
248 ASTContext &Context = *static_cast<ASTContext*>(Cookie);
250 size_t OldEnd = Output.size();
251 llvm::raw_svector_ostream OS(Output);
252 bool NeedQuotes = true;
255 default: llvm_unreachable("unknown ArgumentKind");
256 case DiagnosticsEngine::ak_qualtype_pair: {
257 TemplateDiffTypes &TDT = *reinterpret_cast<TemplateDiffTypes*>(Val);
259 QualType::getFromOpaquePtr(reinterpret_cast<void*>(TDT.FromType));
261 QualType::getFromOpaquePtr(reinterpret_cast<void*>(TDT.ToType));
263 if (FormatTemplateTypeDiff(Context, FromType, ToType, TDT.PrintTree,
264 TDT.PrintFromType, TDT.ElideType,
265 TDT.ShowColors, OS)) {
266 NeedQuotes = !TDT.PrintTree;
267 TDT.TemplateDiffUsed = true;
271 // Don't fall-back during tree printing. The caller will handle
276 // Attempting to do a template diff on non-templates. Set the variables
277 // and continue with regular type printing of the appropriate type.
278 Val = TDT.PrintFromType ? TDT.FromType : TDT.ToType;
283 case DiagnosticsEngine::ak_qualtype: {
284 assert(ModLen == 0 && ArgLen == 0 &&
285 "Invalid modifier for QualType argument");
287 QualType Ty(QualType::getFromOpaquePtr(reinterpret_cast<void*>(Val)));
288 OS << ConvertTypeToDiagnosticString(Context, Ty, PrevArgs, NumPrevArgs,
293 case DiagnosticsEngine::ak_declarationname: {
294 if (ModLen == 9 && !memcmp(Modifier, "objcclass", 9) && ArgLen == 0)
296 else if (ModLen == 12 && !memcmp(Modifier, "objcinstance", 12)
300 assert(ModLen == 0 && ArgLen == 0 &&
301 "Invalid modifier for DeclarationName argument");
303 OS << DeclarationName::getFromOpaqueInteger(Val);
306 case DiagnosticsEngine::ak_nameddecl: {
308 if (ModLen == 1 && Modifier[0] == 'q' && ArgLen == 0)
311 assert(ModLen == 0 && ArgLen == 0 &&
312 "Invalid modifier for NamedDecl* argument");
315 const NamedDecl *ND = reinterpret_cast<const NamedDecl*>(Val);
316 ND->getNameForDiagnostic(OS, Context.getPrintingPolicy(), Qualified);
319 case DiagnosticsEngine::ak_nestednamespec: {
320 NestedNameSpecifier *NNS = reinterpret_cast<NestedNameSpecifier*>(Val);
321 NNS->print(OS, Context.getPrintingPolicy());
325 case DiagnosticsEngine::ak_declcontext: {
326 DeclContext *DC = reinterpret_cast<DeclContext *> (Val);
327 assert(DC && "Should never have a null declaration context");
329 if (DC->isTranslationUnit()) {
330 // FIXME: Get these strings from some localized place
331 if (Context.getLangOpts().CPlusPlus)
332 OS << "the global namespace";
334 OS << "the global scope";
335 } else if (TypeDecl *Type = dyn_cast<TypeDecl>(DC)) {
336 OS << ConvertTypeToDiagnosticString(Context,
337 Context.getTypeDeclType(Type),
338 PrevArgs, NumPrevArgs,
341 // FIXME: Get these strings from some localized place
342 NamedDecl *ND = cast<NamedDecl>(DC);
343 if (isa<NamespaceDecl>(ND))
345 else if (isa<ObjCMethodDecl>(ND))
347 else if (isa<FunctionDecl>(ND))
351 ND->getNameForDiagnostic(OS, Context.getPrintingPolicy(), true);
362 Output.insert(Output.begin()+OldEnd, '\'');
363 Output.push_back('\'');
367 /// TemplateDiff - A class that constructs a pretty string for a pair of
368 /// QualTypes. For the pair of types, a diff tree will be created containing
369 /// all the information about the templates and template arguments. Afterwards,
370 /// the tree is transformed to a string according to the options passed in.
373 /// Context - The ASTContext which is used for comparing template arguments.
376 /// Policy - Used during expression printing.
377 PrintingPolicy Policy;
379 /// ElideType - Option to elide identical types.
382 /// PrintTree - Format output string as a tree.
385 /// ShowColor - Diagnostics support color, so bolding will be used.
388 /// FromType - When single type printing is selected, this is the type to be
389 /// be printed. When tree printing is selected, this type will show up first
393 /// ToType - The type that FromType is compared to. Only in tree printing
394 /// will this type be outputed.
397 /// OS - The stream used to construct the output strings.
400 /// IsBold - Keeps track of the bold formatting for the output string.
403 /// DiffTree - A tree representation the differences between two types.
406 /// DiffKind - The difference in a DiffNode and which fields are used.
408 /// Incomplete or invalid node.
410 /// Another level of templates, uses TemplateDecl and Qualifiers
412 /// Type difference, uses QualType
414 /// Expression difference, uses Expr
416 /// Template argument difference, uses TemplateDecl
418 /// Integer difference, uses APSInt and Expr
420 /// Declaration difference, uses ValueDecl
424 /// DiffNode - The root node stores the original type. Each child node
425 /// stores template arguments of their parents. For templated types, the
426 /// template decl is also stored.
430 /// NextNode - The index of the next sibling node or 0.
433 /// ChildNode - The index of the first child node or 0.
436 /// ParentNode - The index of the parent node.
439 /// FromType, ToType - The type arguments.
440 QualType FromType, ToType;
442 /// FromExpr, ToExpr - The expression arguments.
443 Expr *FromExpr, *ToExpr;
445 /// FromTD, ToTD - The template decl for template template
446 /// arguments or the type arguments that are templates.
447 TemplateDecl *FromTD, *ToTD;
449 /// FromQual, ToQual - Qualifiers for template types.
450 Qualifiers FromQual, ToQual;
452 /// FromInt, ToInt - APSInt's for integral arguments.
453 llvm::APSInt FromInt, ToInt;
455 /// IsValidFromInt, IsValidToInt - Whether the APSInt's are valid.
456 bool IsValidFromInt, IsValidToInt;
458 /// FromValueDecl, ToValueDecl - Whether the argument is a decl.
459 ValueDecl *FromValueDecl, *ToValueDecl;
461 /// FromAddressOf, ToAddressOf - Whether the ValueDecl needs an address of
462 /// operator before it.
463 bool FromAddressOf, ToAddressOf;
465 /// FromDefault, ToDefault - Whether the argument is a default argument.
466 bool FromDefault, ToDefault;
468 /// Same - Whether the two arguments evaluate to the same value.
471 DiffNode(unsigned ParentNode = 0)
472 : Kind(Invalid), NextNode(0), ChildNode(0), ParentNode(ParentNode),
473 FromType(), ToType(), FromExpr(0), ToExpr(0), FromTD(0), ToTD(0),
474 IsValidFromInt(false), IsValidToInt(false), FromValueDecl(0),
475 ToValueDecl(0), FromAddressOf(false), ToAddressOf(false),
476 FromDefault(false), ToDefault(false), Same(false) { }
479 /// FlatTree - A flattened tree used to store the DiffNodes.
480 SmallVector<DiffNode, 16> FlatTree;
482 /// CurrentNode - The index of the current node being used.
483 unsigned CurrentNode;
485 /// NextFreeNode - The index of the next unused node. Used when creating
487 unsigned NextFreeNode;
489 /// ReadNode - The index of the current node being read.
494 CurrentNode(0), NextFreeNode(1) {
495 FlatTree.push_back(DiffNode());
498 // Node writing functions.
499 /// SetNode - Sets FromTD and ToTD of the current node.
500 void SetNode(TemplateDecl *FromTD, TemplateDecl *ToTD) {
501 FlatTree[CurrentNode].FromTD = FromTD;
502 FlatTree[CurrentNode].ToTD = ToTD;
505 /// SetNode - Sets FromType and ToType of the current node.
506 void SetNode(QualType FromType, QualType ToType) {
507 FlatTree[CurrentNode].FromType = FromType;
508 FlatTree[CurrentNode].ToType = ToType;
511 /// SetNode - Set FromExpr and ToExpr of the current node.
512 void SetNode(Expr *FromExpr, Expr *ToExpr) {
513 FlatTree[CurrentNode].FromExpr = FromExpr;
514 FlatTree[CurrentNode].ToExpr = ToExpr;
517 /// SetNode - Set FromInt and ToInt of the current node.
518 void SetNode(llvm::APSInt FromInt, llvm::APSInt ToInt,
519 bool IsValidFromInt, bool IsValidToInt) {
520 FlatTree[CurrentNode].FromInt = FromInt;
521 FlatTree[CurrentNode].ToInt = ToInt;
522 FlatTree[CurrentNode].IsValidFromInt = IsValidFromInt;
523 FlatTree[CurrentNode].IsValidToInt = IsValidToInt;
526 /// SetNode - Set FromQual and ToQual of the current node.
527 void SetNode(Qualifiers FromQual, Qualifiers ToQual) {
528 FlatTree[CurrentNode].FromQual = FromQual;
529 FlatTree[CurrentNode].ToQual = ToQual;
532 /// SetNode - Set FromValueDecl and ToValueDecl of the current node.
533 void SetNode(ValueDecl *FromValueDecl, ValueDecl *ToValueDecl,
534 bool FromAddressOf, bool ToAddressOf) {
535 FlatTree[CurrentNode].FromValueDecl = FromValueDecl;
536 FlatTree[CurrentNode].ToValueDecl = ToValueDecl;
537 FlatTree[CurrentNode].FromAddressOf = FromAddressOf;
538 FlatTree[CurrentNode].ToAddressOf = ToAddressOf;
541 /// SetSame - Sets the same flag of the current node.
542 void SetSame(bool Same) {
543 FlatTree[CurrentNode].Same = Same;
546 /// SetDefault - Sets FromDefault and ToDefault flags of the current node.
547 void SetDefault(bool FromDefault, bool ToDefault) {
548 FlatTree[CurrentNode].FromDefault = FromDefault;
549 FlatTree[CurrentNode].ToDefault = ToDefault;
552 /// SetKind - Sets the current node's type.
553 void SetKind(DiffKind Kind) {
554 FlatTree[CurrentNode].Kind = Kind;
557 /// Up - Changes the node to the parent of the current node.
559 CurrentNode = FlatTree[CurrentNode].ParentNode;
562 /// AddNode - Adds a child node to the current node, then sets that node
563 /// node as the current node.
565 FlatTree.push_back(DiffNode(CurrentNode));
566 DiffNode &Node = FlatTree[CurrentNode];
567 if (Node.ChildNode == 0) {
568 // If a child node doesn't exist, add one.
569 Node.ChildNode = NextFreeNode;
571 // If a child node exists, find the last child node and add a
574 for (i = Node.ChildNode; FlatTree[i].NextNode != 0;
575 i = FlatTree[i].NextNode) {
577 FlatTree[i].NextNode = NextFreeNode;
579 CurrentNode = NextFreeNode;
583 // Node reading functions.
584 /// StartTraverse - Prepares the tree for recursive traversal.
585 void StartTraverse() {
587 CurrentNode = NextFreeNode;
591 /// Parent - Move the current read node to its parent.
593 ReadNode = FlatTree[ReadNode].ParentNode;
596 /// GetNode - Gets the FromType and ToType.
597 void GetNode(QualType &FromType, QualType &ToType) {
598 FromType = FlatTree[ReadNode].FromType;
599 ToType = FlatTree[ReadNode].ToType;
602 /// GetNode - Gets the FromExpr and ToExpr.
603 void GetNode(Expr *&FromExpr, Expr *&ToExpr) {
604 FromExpr = FlatTree[ReadNode].FromExpr;
605 ToExpr = FlatTree[ReadNode].ToExpr;
608 /// GetNode - Gets the FromTD and ToTD.
609 void GetNode(TemplateDecl *&FromTD, TemplateDecl *&ToTD) {
610 FromTD = FlatTree[ReadNode].FromTD;
611 ToTD = FlatTree[ReadNode].ToTD;
614 /// GetNode - Gets the FromInt and ToInt.
615 void GetNode(llvm::APSInt &FromInt, llvm::APSInt &ToInt,
616 bool &IsValidFromInt, bool &IsValidToInt) {
617 FromInt = FlatTree[ReadNode].FromInt;
618 ToInt = FlatTree[ReadNode].ToInt;
619 IsValidFromInt = FlatTree[ReadNode].IsValidFromInt;
620 IsValidToInt = FlatTree[ReadNode].IsValidToInt;
623 /// GetNode - Gets the FromQual and ToQual.
624 void GetNode(Qualifiers &FromQual, Qualifiers &ToQual) {
625 FromQual = FlatTree[ReadNode].FromQual;
626 ToQual = FlatTree[ReadNode].ToQual;
629 /// GetNode - Gets the FromValueDecl and ToValueDecl.
630 void GetNode(ValueDecl *&FromValueDecl, ValueDecl *&ToValueDecl,
631 bool &FromAddressOf, bool &ToAddressOf) {
632 FromValueDecl = FlatTree[ReadNode].FromValueDecl;
633 ToValueDecl = FlatTree[ReadNode].ToValueDecl;
634 FromAddressOf = FlatTree[ReadNode].FromAddressOf;
635 ToAddressOf = FlatTree[ReadNode].ToAddressOf;
638 /// NodeIsSame - Returns true the arguments are the same.
640 return FlatTree[ReadNode].Same;
643 /// HasChildrend - Returns true if the node has children.
645 return FlatTree[ReadNode].ChildNode != 0;
648 /// MoveToChild - Moves from the current node to its child.
650 ReadNode = FlatTree[ReadNode].ChildNode;
653 /// AdvanceSibling - If there is a next sibling, advance to it and return
654 /// true. Otherwise, return false.
655 bool AdvanceSibling() {
656 if (FlatTree[ReadNode].NextNode == 0)
659 ReadNode = FlatTree[ReadNode].NextNode;
663 /// HasNextSibling - Return true if the node has a next sibling.
664 bool HasNextSibling() {
665 return FlatTree[ReadNode].NextNode != 0;
668 /// FromDefault - Return true if the from argument is the default.
670 return FlatTree[ReadNode].FromDefault;
673 /// ToDefault - Return true if the to argument is the default.
675 return FlatTree[ReadNode].ToDefault;
678 /// Empty - Returns true if the tree has no information.
680 return GetKind() == Invalid;
683 /// GetKind - Returns the current node's type.
685 return FlatTree[ReadNode].Kind;
691 /// TSTiterator - an iterator that is used to enter a
692 /// TemplateSpecializationType and read TemplateArguments inside template
693 /// parameter packs in order with the rest of the TemplateArguments.
695 typedef const TemplateArgument& reference;
696 typedef const TemplateArgument* pointer;
698 /// TST - the template specialization whose arguments this iterator
700 const TemplateSpecializationType *TST;
702 /// DesugarTST - desugared template specialization used to extract
703 /// default argument information
704 const TemplateSpecializationType *DesugarTST;
706 /// Index - the index of the template argument in TST.
709 /// CurrentTA - if CurrentTA is not the same as EndTA, then CurrentTA
710 /// points to a TemplateArgument within a parameter pack.
711 TemplateArgument::pack_iterator CurrentTA;
713 /// EndTA - the end iterator of a parameter pack
714 TemplateArgument::pack_iterator EndTA;
716 /// TSTiterator - Constructs an iterator and sets it to the first template
718 TSTiterator(ASTContext &Context, const TemplateSpecializationType *TST)
720 DesugarTST(GetTemplateSpecializationType(Context, TST->desugar())),
721 Index(0), CurrentTA(0), EndTA(0) {
724 // Set to first template argument. If not a parameter pack, done.
725 TemplateArgument TA = TST->getArg(0);
726 if (TA.getKind() != TemplateArgument::Pack) return;
728 // Start looking into the parameter pack.
729 CurrentTA = TA.pack_begin();
730 EndTA = TA.pack_end();
732 // Found a valid template argument.
733 if (CurrentTA != EndTA) return;
735 // Parameter pack is empty, use the increment to get to a valid
736 // template argument.
740 /// isEnd - Returns true if the iterator is one past the end.
742 return Index >= TST->getNumArgs();
745 /// &operator++ - Increment the iterator to the next template argument.
746 TSTiterator &operator++() {
747 // After the end, Index should be the default argument position in
748 // DesugarTST, if it exists.
754 // If in a parameter pack, advance in the parameter pack.
755 if (CurrentTA != EndTA) {
757 if (CurrentTA != EndTA)
761 // Loop until a template argument is found, or the end is reached.
763 // Advance to the next template argument. Break if reached the end.
764 if (++Index == TST->getNumArgs()) break;
766 // If the TemplateArgument is not a parameter pack, done.
767 TemplateArgument TA = TST->getArg(Index);
768 if (TA.getKind() != TemplateArgument::Pack) break;
770 // Handle parameter packs.
771 CurrentTA = TA.pack_begin();
772 EndTA = TA.pack_end();
774 // If the parameter pack is empty, try to advance again.
775 if (CurrentTA != EndTA) break;
780 /// operator* - Returns the appropriate TemplateArgument.
781 reference operator*() const {
782 assert(!isEnd() && "Index exceeds number of arguments.");
783 if (CurrentTA == EndTA)
784 return TST->getArg(Index);
789 /// operator-> - Allow access to the underlying TemplateArgument.
790 pointer operator->() const {
794 /// getDesugar - Returns the deduced template argument from DesguarTST
795 reference getDesugar() const {
796 return DesugarTST->getArg(Index);
800 // These functions build up the template diff tree, including functions to
801 // retrieve and compare template arguments.
803 static const TemplateSpecializationType * GetTemplateSpecializationType(
804 ASTContext &Context, QualType Ty) {
805 if (const TemplateSpecializationType *TST =
806 Ty->getAs<TemplateSpecializationType>())
809 const RecordType *RT = Ty->getAs<RecordType>();
814 const ClassTemplateSpecializationDecl *CTSD =
815 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl());
820 Ty = Context.getTemplateSpecializationType(
821 TemplateName(CTSD->getSpecializedTemplate()),
822 CTSD->getTemplateArgs().data(),
823 CTSD->getTemplateArgs().size(),
824 Ty.getLocalUnqualifiedType().getCanonicalType());
826 return Ty->getAs<TemplateSpecializationType>();
829 /// DiffTemplate - recursively visits template arguments and stores the
830 /// argument info into a tree.
831 void DiffTemplate(const TemplateSpecializationType *FromTST,
832 const TemplateSpecializationType *ToTST) {
833 // Begin descent into diffing template tree.
834 TemplateParameterList *ParamsFrom =
835 FromTST->getTemplateName().getAsTemplateDecl()->getTemplateParameters();
836 TemplateParameterList *ParamsTo =
837 ToTST->getTemplateName().getAsTemplateDecl()->getTemplateParameters();
838 unsigned TotalArgs = 0;
839 for (TSTiterator FromIter(Context, FromTST), ToIter(Context, ToTST);
840 !FromIter.isEnd() || !ToIter.isEnd(); ++TotalArgs) {
843 // Get the parameter at index TotalArgs. If index is larger
844 // than the total number of parameters, then there is an
845 // argument pack, so re-use the last parameter.
846 unsigned ParamIndex = std::min(TotalArgs, ParamsFrom->size() - 1);
847 NamedDecl *ParamND = ParamsFrom->getParam(ParamIndex);
850 if (TemplateTypeParmDecl *DefaultTTPD =
851 dyn_cast<TemplateTypeParmDecl>(ParamND)) {
852 QualType FromType, ToType;
853 FromType = GetType(FromIter, DefaultTTPD);
854 // A forward declaration can have no default arg but the actual class
855 // can, don't mix up iterators and get the original parameter.
857 ToIter, cast<TemplateTypeParmDecl>(ParamsTo->getParam(ParamIndex)));
858 Tree.SetNode(FromType, ToType);
859 Tree.SetDefault(FromIter.isEnd() && !FromType.isNull(),
860 ToIter.isEnd() && !ToType.isNull());
861 Tree.SetKind(DiffTree::Type);
862 if (!FromType.isNull() && !ToType.isNull()) {
863 if (Context.hasSameType(FromType, ToType)) {
866 Qualifiers FromQual = FromType.getQualifiers(),
867 ToQual = ToType.getQualifiers();
868 const TemplateSpecializationType *FromArgTST =
869 GetTemplateSpecializationType(Context, FromType);
870 const TemplateSpecializationType *ToArgTST =
871 GetTemplateSpecializationType(Context, ToType);
873 if (FromArgTST && ToArgTST &&
874 hasSameTemplate(FromArgTST, ToArgTST)) {
875 FromQual -= QualType(FromArgTST, 0).getQualifiers();
876 ToQual -= QualType(ToArgTST, 0).getQualifiers();
877 Tree.SetNode(FromArgTST->getTemplateName().getAsTemplateDecl(),
878 ToArgTST->getTemplateName().getAsTemplateDecl());
879 Tree.SetNode(FromQual, ToQual);
880 Tree.SetKind(DiffTree::Template);
881 DiffTemplate(FromArgTST, ToArgTST);
887 // Handle Expressions
888 if (NonTypeTemplateParmDecl *DefaultNTTPD =
889 dyn_cast<NonTypeTemplateParmDecl>(ParamND)) {
890 Expr *FromExpr = 0, *ToExpr = 0;
891 llvm::APSInt FromInt, ToInt;
892 ValueDecl *FromValueDecl = 0, *ToValueDecl = 0;
893 unsigned ParamWidth = 128; // Safe default
894 if (DefaultNTTPD->getType()->isIntegralOrEnumerationType())
895 ParamWidth = Context.getIntWidth(DefaultNTTPD->getType());
896 bool HasFromInt = !FromIter.isEnd() &&
897 FromIter->getKind() == TemplateArgument::Integral;
898 bool HasToInt = !ToIter.isEnd() &&
899 ToIter->getKind() == TemplateArgument::Integral;
900 bool HasFromValueDecl =
902 FromIter->getKind() == TemplateArgument::Declaration;
903 bool HasToValueDecl =
905 ToIter->getKind() == TemplateArgument::Declaration;
907 assert(((!HasFromInt && !HasToInt) ||
908 (!HasFromValueDecl && !HasToValueDecl)) &&
909 "Template argument cannot be both integer and declaration");
912 FromInt = FromIter->getAsIntegral();
913 else if (HasFromValueDecl)
914 FromValueDecl = FromIter->getAsDecl();
916 FromExpr = GetExpr(FromIter, DefaultNTTPD);
919 ToInt = ToIter->getAsIntegral();
920 else if (HasToValueDecl)
921 ToValueDecl = ToIter->getAsDecl();
923 ToExpr = GetExpr(ToIter, DefaultNTTPD);
925 if (!HasFromInt && !HasToInt && !HasFromValueDecl && !HasToValueDecl) {
926 Tree.SetNode(FromExpr, ToExpr);
927 Tree.SetDefault(FromIter.isEnd() && FromExpr,
928 ToIter.isEnd() && ToExpr);
929 if (DefaultNTTPD->getType()->isIntegralOrEnumerationType()) {
931 FromInt = GetInt(FromIter, FromExpr);
933 ToInt = GetInt(ToIter, ToExpr);
934 Tree.SetNode(FromInt, ToInt, FromExpr, ToExpr);
935 Tree.SetSame(IsSameConvertedInt(ParamWidth, FromInt, ToInt));
936 Tree.SetKind(DiffTree::Integer);
938 Tree.SetSame(IsEqualExpr(Context, ParamWidth, FromExpr, ToExpr));
939 Tree.SetKind(DiffTree::Expression);
941 } else if (HasFromInt || HasToInt) {
942 if (!HasFromInt && FromExpr) {
943 FromInt = GetInt(FromIter, FromExpr);
946 if (!HasToInt && ToExpr) {
947 ToInt = GetInt(ToIter, ToExpr);
950 Tree.SetNode(FromInt, ToInt, HasFromInt, HasToInt);
951 Tree.SetSame(IsSameConvertedInt(ParamWidth, FromInt, ToInt));
952 Tree.SetDefault(FromIter.isEnd() && HasFromInt,
953 ToIter.isEnd() && HasToInt);
954 Tree.SetKind(DiffTree::Integer);
956 if (!HasFromValueDecl && FromExpr)
957 FromValueDecl = GetValueDecl(FromIter, FromExpr);
958 if (!HasToValueDecl && ToExpr)
959 ToValueDecl = GetValueDecl(ToIter, ToExpr);
960 QualType ArgumentType = DefaultNTTPD->getType();
961 bool FromAddressOf = FromValueDecl &&
962 !ArgumentType->isReferenceType() &&
963 !FromValueDecl->getType()->isArrayType();
964 bool ToAddressOf = ToValueDecl &&
965 !ArgumentType->isReferenceType() &&
966 !ToValueDecl->getType()->isArrayType();
967 Tree.SetNode(FromValueDecl, ToValueDecl, FromAddressOf, ToAddressOf);
968 Tree.SetSame(FromValueDecl && ToValueDecl &&
969 FromValueDecl->getCanonicalDecl() ==
970 ToValueDecl->getCanonicalDecl());
971 Tree.SetDefault(FromIter.isEnd() && FromValueDecl,
972 ToIter.isEnd() && ToValueDecl);
973 Tree.SetKind(DiffTree::Declaration);
978 if (TemplateTemplateParmDecl *DefaultTTPD =
979 dyn_cast<TemplateTemplateParmDecl>(ParamND)) {
980 TemplateDecl *FromDecl, *ToDecl;
981 FromDecl = GetTemplateDecl(FromIter, DefaultTTPD);
982 ToDecl = GetTemplateDecl(ToIter, DefaultTTPD);
983 Tree.SetNode(FromDecl, ToDecl);
985 FromDecl && ToDecl &&
986 FromDecl->getCanonicalDecl() == ToDecl->getCanonicalDecl());
987 Tree.SetKind(DiffTree::TemplateTemplate);
996 /// makeTemplateList - Dump every template alias into the vector.
997 static void makeTemplateList(
998 SmallVectorImpl<const TemplateSpecializationType *> &TemplateList,
999 const TemplateSpecializationType *TST) {
1001 TemplateList.push_back(TST);
1002 if (!TST->isTypeAlias())
1004 TST = TST->getAliasedType()->getAs<TemplateSpecializationType>();
1008 /// hasSameBaseTemplate - Returns true when the base templates are the same,
1009 /// even if the template arguments are not.
1010 static bool hasSameBaseTemplate(const TemplateSpecializationType *FromTST,
1011 const TemplateSpecializationType *ToTST) {
1012 return FromTST->getTemplateName().getAsTemplateDecl()->getCanonicalDecl() ==
1013 ToTST->getTemplateName().getAsTemplateDecl()->getCanonicalDecl();
1016 /// hasSameTemplate - Returns true if both types are specialized from the
1017 /// same template declaration. If they come from different template aliases,
1018 /// do a parallel ascension search to determine the highest template alias in
1019 /// common and set the arguments to them.
1020 static bool hasSameTemplate(const TemplateSpecializationType *&FromTST,
1021 const TemplateSpecializationType *&ToTST) {
1022 // Check the top templates if they are the same.
1023 if (hasSameBaseTemplate(FromTST, ToTST))
1026 // Create vectors of template aliases.
1027 SmallVector<const TemplateSpecializationType*, 1> FromTemplateList,
1030 makeTemplateList(FromTemplateList, FromTST);
1031 makeTemplateList(ToTemplateList, ToTST);
1033 SmallVectorImpl<const TemplateSpecializationType *>::reverse_iterator
1034 FromIter = FromTemplateList.rbegin(), FromEnd = FromTemplateList.rend(),
1035 ToIter = ToTemplateList.rbegin(), ToEnd = ToTemplateList.rend();
1037 // Check if the lowest template types are the same. If not, return.
1038 if (!hasSameBaseTemplate(*FromIter, *ToIter))
1041 // Begin searching up the template aliases. The bottom most template
1042 // matches so move up until one pair does not match. Use the template
1043 // right before that one.
1044 for (; FromIter != FromEnd && ToIter != ToEnd; ++FromIter, ++ToIter) {
1045 if (!hasSameBaseTemplate(*FromIter, *ToIter))
1049 FromTST = FromIter[-1];
1055 /// GetType - Retrieves the template type arguments, including default
1057 QualType GetType(const TSTiterator &Iter, TemplateTypeParmDecl *DefaultTTPD) {
1058 bool isVariadic = DefaultTTPD->isParameterPack();
1061 return Iter->getAsType();
1065 QualType ArgType = DefaultTTPD->getDefaultArgument();
1066 if (ArgType->isDependentType())
1067 return Iter.getDesugar().getAsType();
1072 /// GetExpr - Retrieves the template expression argument, including default
1074 Expr *GetExpr(const TSTiterator &Iter, NonTypeTemplateParmDecl *DefaultNTTPD) {
1076 bool isVariadic = DefaultNTTPD->isParameterPack();
1079 ArgExpr = Iter->getAsExpr();
1080 else if (!isVariadic)
1081 ArgExpr = DefaultNTTPD->getDefaultArgument();
1084 while (SubstNonTypeTemplateParmExpr *SNTTPE =
1085 dyn_cast<SubstNonTypeTemplateParmExpr>(ArgExpr))
1086 ArgExpr = SNTTPE->getReplacement();
1091 /// GetInt - Retrieves the template integer argument, including evaluating
1092 /// default arguments.
1093 llvm::APInt GetInt(const TSTiterator &Iter, Expr *ArgExpr) {
1094 // Default, value-depenedent expressions require fetching
1095 // from the desugared TemplateArgument
1096 if (Iter.isEnd() && ArgExpr->isValueDependent())
1097 switch (Iter.getDesugar().getKind()) {
1098 case TemplateArgument::Integral:
1099 return Iter.getDesugar().getAsIntegral();
1100 case TemplateArgument::Expression:
1101 ArgExpr = Iter.getDesugar().getAsExpr();
1102 return ArgExpr->EvaluateKnownConstInt(Context);
1104 assert(0 && "Unexpected template argument kind");
1106 return ArgExpr->EvaluateKnownConstInt(Context);
1109 /// GetValueDecl - Retrieves the template Decl argument, including
1110 /// default expression argument.
1111 ValueDecl *GetValueDecl(const TSTiterator &Iter, Expr *ArgExpr) {
1112 // Default, value-depenedent expressions require fetching
1113 // from the desugared TemplateArgument
1114 if (Iter.isEnd() && ArgExpr->isValueDependent())
1115 switch (Iter.getDesugar().getKind()) {
1116 case TemplateArgument::Declaration:
1117 return Iter.getDesugar().getAsDecl();
1118 case TemplateArgument::Expression:
1119 ArgExpr = Iter.getDesugar().getAsExpr();
1120 return cast<DeclRefExpr>(ArgExpr)->getDecl();
1122 assert(0 && "Unexpected template argument kind");
1124 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ArgExpr);
1126 DRE = cast<DeclRefExpr>(cast<UnaryOperator>(ArgExpr)->getSubExpr());
1129 return DRE->getDecl();
1132 /// GetTemplateDecl - Retrieves the template template arguments, including
1133 /// default arguments.
1134 TemplateDecl *GetTemplateDecl(const TSTiterator &Iter,
1135 TemplateTemplateParmDecl *DefaultTTPD) {
1136 bool isVariadic = DefaultTTPD->isParameterPack();
1138 TemplateArgument TA = DefaultTTPD->getDefaultArgument().getArgument();
1139 TemplateDecl *DefaultTD = 0;
1140 if (TA.getKind() != TemplateArgument::Null)
1141 DefaultTD = TA.getAsTemplate().getAsTemplateDecl();
1144 return Iter->getAsTemplate().getAsTemplateDecl();
1151 /// IsSameConvertedInt - Returns true if both integers are equal when
1152 /// converted to an integer type with the given width.
1153 static bool IsSameConvertedInt(unsigned Width, const llvm::APSInt &X,
1154 const llvm::APSInt &Y) {
1155 llvm::APInt ConvertedX = X.extOrTrunc(Width);
1156 llvm::APInt ConvertedY = Y.extOrTrunc(Width);
1157 return ConvertedX == ConvertedY;
1160 /// IsEqualExpr - Returns true if the expressions evaluate to the same value.
1161 static bool IsEqualExpr(ASTContext &Context, unsigned ParamWidth,
1162 Expr *FromExpr, Expr *ToExpr) {
1163 if (FromExpr == ToExpr)
1166 if (!FromExpr || !ToExpr)
1169 FromExpr = FromExpr->IgnoreParens();
1170 ToExpr = ToExpr->IgnoreParens();
1172 DeclRefExpr *FromDRE = dyn_cast<DeclRefExpr>(FromExpr),
1173 *ToDRE = dyn_cast<DeclRefExpr>(ToExpr);
1175 if (FromDRE || ToDRE) {
1176 if (!FromDRE || !ToDRE)
1178 return FromDRE->getDecl() == ToDRE->getDecl();
1181 Expr::EvalResult FromResult, ToResult;
1182 if (!FromExpr->EvaluateAsRValue(FromResult, Context) ||
1183 !ToExpr->EvaluateAsRValue(ToResult, Context))
1186 APValue &FromVal = FromResult.Val;
1187 APValue &ToVal = ToResult.Val;
1189 if (FromVal.getKind() != ToVal.getKind()) return false;
1191 switch (FromVal.getKind()) {
1193 return IsSameConvertedInt(ParamWidth, FromVal.getInt(), ToVal.getInt());
1194 case APValue::LValue: {
1195 APValue::LValueBase FromBase = FromVal.getLValueBase();
1196 APValue::LValueBase ToBase = ToVal.getLValueBase();
1197 if (FromBase.isNull() && ToBase.isNull())
1199 if (FromBase.isNull() || ToBase.isNull())
1201 return FromBase.get<const ValueDecl*>() ==
1202 ToBase.get<const ValueDecl*>();
1204 case APValue::MemberPointer:
1205 return FromVal.getMemberPointerDecl() == ToVal.getMemberPointerDecl();
1207 llvm_unreachable("Unknown template argument expression.");
1211 // These functions converts the tree representation of the template
1212 // differences into the internal character vector.
1214 /// TreeToString - Converts the Tree object into a character stream which
1215 /// will later be turned into the output string.
1216 void TreeToString(int Indent = 1) {
1219 OS.indent(2 * Indent);
1223 // Handle cases where the difference is not templates with different
1225 switch (Tree.GetKind()) {
1226 case DiffTree::Invalid:
1227 llvm_unreachable("Template diffing failed with bad DiffNode");
1228 case DiffTree::Type: {
1229 QualType FromType, ToType;
1230 Tree.GetNode(FromType, ToType);
1231 PrintTypeNames(FromType, ToType, Tree.FromDefault(), Tree.ToDefault(),
1235 case DiffTree::Expression: {
1236 Expr *FromExpr, *ToExpr;
1237 Tree.GetNode(FromExpr, ToExpr);
1238 PrintExpr(FromExpr, ToExpr, Tree.FromDefault(), Tree.ToDefault(),
1242 case DiffTree::TemplateTemplate: {
1243 TemplateDecl *FromTD, *ToTD;
1244 Tree.GetNode(FromTD, ToTD);
1245 PrintTemplateTemplate(FromTD, ToTD, Tree.FromDefault(),
1246 Tree.ToDefault(), Tree.NodeIsSame());
1249 case DiffTree::Integer: {
1250 llvm::APSInt FromInt, ToInt;
1251 Expr *FromExpr, *ToExpr;
1252 bool IsValidFromInt, IsValidToInt;
1253 Tree.GetNode(FromExpr, ToExpr);
1254 Tree.GetNode(FromInt, ToInt, IsValidFromInt, IsValidToInt);
1255 PrintAPSInt(FromInt, ToInt, IsValidFromInt, IsValidToInt,
1256 FromExpr, ToExpr, Tree.FromDefault(), Tree.ToDefault(),
1260 case DiffTree::Declaration: {
1261 ValueDecl *FromValueDecl, *ToValueDecl;
1262 bool FromAddressOf, ToAddressOf;
1263 Tree.GetNode(FromValueDecl, ToValueDecl, FromAddressOf, ToAddressOf);
1264 PrintValueDecl(FromValueDecl, ToValueDecl, FromAddressOf, ToAddressOf,
1265 Tree.FromDefault(), Tree.ToDefault(), Tree.NodeIsSame());
1268 case DiffTree::Template: {
1269 // Node is root of template. Recurse on children.
1270 TemplateDecl *FromTD, *ToTD;
1271 Tree.GetNode(FromTD, ToTD);
1273 if (!Tree.HasChildren()) {
1274 // If we're dealing with a template specialization with zero
1275 // arguments, there are no children; special-case this.
1276 OS << FromTD->getNameAsString() << "<>";
1280 Qualifiers FromQual, ToQual;
1281 Tree.GetNode(FromQual, ToQual);
1282 PrintQualifiers(FromQual, ToQual);
1284 OS << FromTD->getNameAsString() << '<';
1286 unsigned NumElideArgs = 0;
1289 if (Tree.NodeIsSame()) {
1293 if (NumElideArgs > 0) {
1294 PrintElideArgs(NumElideArgs, Indent);
1299 TreeToString(Indent);
1300 if (Tree.HasNextSibling())
1302 } while (Tree.AdvanceSibling());
1303 if (NumElideArgs > 0)
1304 PrintElideArgs(NumElideArgs, Indent);
1313 // To signal to the text printer that a certain text needs to be bolded,
1314 // a special character is injected into the character stream which the
1315 // text printer will later strip out.
1317 /// Bold - Start bolding text.
1319 assert(!IsBold && "Attempting to bold text that is already bold.");
1322 OS << ToggleHighlight;
1325 /// Unbold - Stop bolding text.
1327 assert(IsBold && "Attempting to remove bold from unbold text.");
1330 OS << ToggleHighlight;
1333 // Functions to print out the arguments and highlighting the difference.
1335 /// PrintTypeNames - prints the typenames, bolding differences. Will detect
1336 /// typenames that are the same and attempt to disambiguate them by using
1337 /// canonical typenames.
1338 void PrintTypeNames(QualType FromType, QualType ToType,
1339 bool FromDefault, bool ToDefault, bool Same) {
1340 assert((!FromType.isNull() || !ToType.isNull()) &&
1341 "Only one template argument may be missing.");
1344 OS << FromType.getAsString();
1348 if (!FromType.isNull() && !ToType.isNull() &&
1349 FromType.getLocalUnqualifiedType() ==
1350 ToType.getLocalUnqualifiedType()) {
1351 Qualifiers FromQual = FromType.getLocalQualifiers(),
1352 ToQual = ToType.getLocalQualifiers(),
1354 PrintQualifiers(FromQual, ToQual);
1355 FromType.getLocalUnqualifiedType().print(OS, Policy);
1359 std::string FromTypeStr = FromType.isNull() ? "(no argument)"
1360 : FromType.getAsString();
1361 std::string ToTypeStr = ToType.isNull() ? "(no argument)"
1362 : ToType.getAsString();
1363 // Switch to canonical typename if it is better.
1364 // TODO: merge this with other aka printing above.
1365 if (FromTypeStr == ToTypeStr) {
1366 std::string FromCanTypeStr = FromType.getCanonicalType().getAsString();
1367 std::string ToCanTypeStr = ToType.getCanonicalType().getAsString();
1368 if (FromCanTypeStr != ToCanTypeStr) {
1369 FromTypeStr = FromCanTypeStr;
1370 ToTypeStr = ToCanTypeStr;
1374 if (PrintTree) OS << '[';
1375 OS << (FromDefault ? "(default) " : "");
1380 OS << " != " << (ToDefault ? "(default) " : "");
1389 /// PrintExpr - Prints out the expr template arguments, highlighting argument
1391 void PrintExpr(const Expr *FromExpr, const Expr *ToExpr,
1392 bool FromDefault, bool ToDefault, bool Same) {
1393 assert((FromExpr || ToExpr) &&
1394 "Only one template argument may be missing.");
1396 PrintExpr(FromExpr);
1397 } else if (!PrintTree) {
1398 OS << (FromDefault ? "(default) " : "");
1400 PrintExpr(FromExpr);
1403 OS << (FromDefault ? "[(default) " : "[");
1405 PrintExpr(FromExpr);
1407 OS << " != " << (ToDefault ? "(default) " : "");
1415 /// PrintExpr - Actual formatting and printing of expressions.
1416 void PrintExpr(const Expr *E) {
1418 OS << "(no argument)";
1420 E->printPretty(OS, 0, Policy); return;
1423 /// PrintTemplateTemplate - Handles printing of template template arguments,
1424 /// highlighting argument differences.
1425 void PrintTemplateTemplate(TemplateDecl *FromTD, TemplateDecl *ToTD,
1426 bool FromDefault, bool ToDefault, bool Same) {
1427 assert((FromTD || ToTD) && "Only one template argument may be missing.");
1429 std::string FromName = FromTD ? FromTD->getName() : "(no argument)";
1430 std::string ToName = ToTD ? ToTD->getName() : "(no argument)";
1431 if (FromTD && ToTD && FromName == ToName) {
1432 FromName = FromTD->getQualifiedNameAsString();
1433 ToName = ToTD->getQualifiedNameAsString();
1437 OS << "template " << FromTD->getNameAsString();
1438 } else if (!PrintTree) {
1439 OS << (FromDefault ? "(default) template " : "template ");
1444 OS << (FromDefault ? "[(default) template " : "[template ");
1448 OS << " != " << (ToDefault ? "(default) template " : "template ");
1456 /// PrintAPSInt - Handles printing of integral arguments, highlighting
1457 /// argument differences.
1458 void PrintAPSInt(llvm::APSInt FromInt, llvm::APSInt ToInt,
1459 bool IsValidFromInt, bool IsValidToInt, Expr *FromExpr,
1460 Expr *ToExpr, bool FromDefault, bool ToDefault, bool Same) {
1461 assert((IsValidFromInt || IsValidToInt) &&
1462 "Only one integral argument may be missing.");
1465 OS << FromInt.toString(10);
1466 } else if (!PrintTree) {
1467 OS << (FromDefault ? "(default) " : "");
1468 PrintAPSInt(FromInt, FromExpr, IsValidFromInt);
1470 OS << (FromDefault ? "[(default) " : "[");
1471 PrintAPSInt(FromInt, FromExpr, IsValidFromInt);
1472 OS << " != " << (ToDefault ? "(default) " : "");
1473 PrintAPSInt(ToInt, ToExpr, IsValidToInt);
1478 /// PrintAPSInt - If valid, print the APSInt. If the expression is
1479 /// gives more information, print it too.
1480 void PrintAPSInt(llvm::APSInt Val, Expr *E, bool Valid) {
1483 if (HasExtraInfo(E)) {
1489 OS << Val.toString(10);
1491 OS << "(no argument)";
1496 /// HasExtraInfo - Returns true if E is not an integer literal or the
1497 /// negation of an integer literal
1498 bool HasExtraInfo(Expr *E) {
1499 if (!E) return false;
1500 if (isa<IntegerLiteral>(E)) return false;
1502 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E))
1503 if (UO->getOpcode() == UO_Minus)
1504 if (isa<IntegerLiteral>(UO->getSubExpr()))
1510 /// PrintDecl - Handles printing of Decl arguments, highlighting
1511 /// argument differences.
1512 void PrintValueDecl(ValueDecl *FromValueDecl, ValueDecl *ToValueDecl,
1513 bool FromAddressOf, bool ToAddressOf, bool FromDefault,
1514 bool ToDefault, bool Same) {
1515 assert((FromValueDecl || ToValueDecl) &&
1516 "Only one Decl argument may be NULL");
1519 OS << FromValueDecl->getName();
1520 } else if (!PrintTree) {
1521 OS << (FromDefault ? "(default) " : "");
1525 OS << (FromValueDecl ? FromValueDecl->getName() : "(no argument)");
1528 OS << (FromDefault ? "[(default) " : "[");
1532 OS << (FromValueDecl ? FromValueDecl->getName() : "(no argument)");
1534 OS << " != " << (ToDefault ? "(default) " : "");
1538 OS << (ToValueDecl ? ToValueDecl->getName() : "(no argument)");
1545 // Prints the appropriate placeholder for elided template arguments.
1546 void PrintElideArgs(unsigned NumElideArgs, unsigned Indent) {
1549 for (unsigned i = 0; i < Indent; ++i)
1552 if (NumElideArgs == 0) return;
1553 if (NumElideArgs == 1)
1556 OS << "[" << NumElideArgs << " * ...]";
1559 // Prints and highlights differences in Qualifiers.
1560 void PrintQualifiers(Qualifiers FromQual, Qualifiers ToQual) {
1561 // Both types have no qualifiers
1562 if (FromQual.empty() && ToQual.empty())
1565 // Both types have same qualifiers
1566 if (FromQual == ToQual) {
1567 PrintQualifier(FromQual, /*ApplyBold*/false);
1571 // Find common qualifiers and strip them from FromQual and ToQual.
1572 Qualifiers CommonQual = Qualifiers::removeCommonQualifiers(FromQual,
1575 // The qualifiers are printed before the template name.
1577 // The common qualifiers are printed. Then, qualifiers only in this type
1578 // are printed and highlighted. Finally, qualifiers only in the other
1579 // type are printed and highlighted inside parentheses after "missing".
1581 // Qualifiers are printed next to each other, inside brackets, and
1582 // separated by "!=". The printing order is:
1583 // common qualifiers, highlighted from qualifiers, "!=",
1584 // common qualifiers, highlighted to qualifiers
1587 if (CommonQual.empty() && FromQual.empty()) {
1589 OS << "(no qualifiers) ";
1592 PrintQualifier(CommonQual, /*ApplyBold*/false);
1593 PrintQualifier(FromQual, /*ApplyBold*/true);
1596 if (CommonQual.empty() && ToQual.empty()) {
1598 OS << "(no qualifiers)";
1601 PrintQualifier(CommonQual, /*ApplyBold*/false,
1602 /*appendSpaceIfNonEmpty*/!ToQual.empty());
1603 PrintQualifier(ToQual, /*ApplyBold*/true,
1604 /*appendSpaceIfNonEmpty*/false);
1608 PrintQualifier(CommonQual, /*ApplyBold*/false);
1609 PrintQualifier(FromQual, /*ApplyBold*/true);
1613 void PrintQualifier(Qualifiers Q, bool ApplyBold,
1614 bool AppendSpaceIfNonEmpty = true) {
1615 if (Q.empty()) return;
1616 if (ApplyBold) Bold();
1617 Q.print(OS, Policy, AppendSpaceIfNonEmpty);
1618 if (ApplyBold) Unbold();
1623 TemplateDiff(raw_ostream &OS, ASTContext &Context, QualType FromType,
1624 QualType ToType, bool PrintTree, bool PrintFromType,
1625 bool ElideType, bool ShowColor)
1627 Policy(Context.getLangOpts()),
1628 ElideType(ElideType),
1629 PrintTree(PrintTree),
1630 ShowColor(ShowColor),
1631 // When printing a single type, the FromType is the one printed.
1632 FromType(PrintFromType ? FromType : ToType),
1633 ToType(PrintFromType ? ToType : FromType),
1638 /// DiffTemplate - Start the template type diffing.
1639 void DiffTemplate() {
1640 Qualifiers FromQual = FromType.getQualifiers(),
1641 ToQual = ToType.getQualifiers();
1643 const TemplateSpecializationType *FromOrigTST =
1644 GetTemplateSpecializationType(Context, FromType);
1645 const TemplateSpecializationType *ToOrigTST =
1646 GetTemplateSpecializationType(Context, ToType);
1648 // Only checking templates.
1649 if (!FromOrigTST || !ToOrigTST)
1652 // Different base templates.
1653 if (!hasSameTemplate(FromOrigTST, ToOrigTST)) {
1657 FromQual -= QualType(FromOrigTST, 0).getQualifiers();
1658 ToQual -= QualType(ToOrigTST, 0).getQualifiers();
1659 Tree.SetNode(FromType, ToType);
1660 Tree.SetNode(FromQual, ToQual);
1661 Tree.SetKind(DiffTree::Template);
1663 // Same base template, but different arguments.
1664 Tree.SetNode(FromOrigTST->getTemplateName().getAsTemplateDecl(),
1665 ToOrigTST->getTemplateName().getAsTemplateDecl());
1667 DiffTemplate(FromOrigTST, ToOrigTST);
1670 /// Emit - When the two types given are templated types with the same
1671 /// base template, a string representation of the type difference will be
1672 /// emitted to the stream and return true. Otherwise, return false.
1674 Tree.StartTraverse();
1679 assert(!IsBold && "Bold is applied to end of string.");
1682 }; // end class TemplateDiff
1685 /// FormatTemplateTypeDiff - A helper static function to start the template
1686 /// diff and return the properly formatted string. Returns true if the diff
1688 static bool FormatTemplateTypeDiff(ASTContext &Context, QualType FromType,
1689 QualType ToType, bool PrintTree,
1690 bool PrintFromType, bool ElideType,
1691 bool ShowColors, raw_ostream &OS) {
1693 PrintFromType = true;
1694 TemplateDiff TD(OS, Context, FromType, ToType, PrintTree, PrintFromType,
1695 ElideType, ShowColors);