1 //===- CodeCompleteConsumer.h - Code Completion Interface -------*- C++ -*-===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This file defines the CodeCompleteConsumer class.
11 //===----------------------------------------------------------------------===//
13 #ifndef LLVM_CLANG_SEMA_CODECOMPLETECONSUMER_H
14 #define LLVM_CLANG_SEMA_CODECOMPLETECONSUMER_H
16 #include "clang-c/Index.h"
17 #include "clang/AST/Type.h"
18 #include "clang/Basic/LLVM.h"
19 #include "clang/Lex/MacroInfo.h"
20 #include "clang/Sema/CodeCompleteOptions.h"
21 #include "clang/Sema/DeclSpec.h"
22 #include "llvm/ADT/ArrayRef.h"
23 #include "llvm/ADT/DenseMap.h"
24 #include "llvm/ADT/None.h"
25 #include "llvm/ADT/Optional.h"
26 #include "llvm/ADT/SmallPtrSet.h"
27 #include "llvm/ADT/SmallVector.h"
28 #include "llvm/ADT/StringRef.h"
29 #include "llvm/Support/Allocator.h"
30 #include "llvm/Support/type_traits.h"
42 class FunctionTemplateDecl;
46 class NestedNameSpecifier;
50 class UsingShadowDecl;
52 /// Default priority values for code-completion results based
55 /// Priority for the next initialization in a constructor initializer
57 CCP_NextInitializer = 7,
59 /// Priority for an enumeration constant inside a switch whose
60 /// condition is of the enumeration type.
63 /// Priority for a send-to-super completion.
64 CCP_SuperCompletion = 20,
66 /// Priority for a declaration that is in the local scope.
67 CCP_LocalDeclaration = 34,
69 /// Priority for a member declaration found from the current
70 /// method or member function.
71 CCP_MemberDeclaration = 35,
73 /// Priority for a language keyword (that isn't any of the other
77 /// Priority for a code pattern.
80 /// Priority for a non-type declaration.
83 /// Priority for a type.
84 CCP_Type = CCP_Declaration,
86 /// Priority for a constant value (e.g., enumerator).
89 /// Priority for a preprocessor macro.
92 /// Priority for a nested-name-specifier.
93 CCP_NestedNameSpecifier = 75,
95 /// Priority for a result that isn't likely to be what the user wants,
96 /// but is included for completeness.
99 /// Priority for the Objective-C "_cmd" implicit parameter.
100 CCP_ObjC_cmd = CCP_Unlikely
103 /// Priority value deltas that are added to code-completion results
104 /// based on the context of the result.
106 /// The result is in a base class.
109 /// The result is a C++ non-static member function whose qualifiers
110 /// exactly match the object type on which the member function can be called.
111 CCD_ObjectQualifierMatch = -1,
113 /// The selector of the given message exactly matches the selector
114 /// of the current method, which might imply that some kind of delegation
116 CCD_SelectorMatch = -3,
118 /// Adjustment to the "bool" type in Objective-C, where the typedef
119 /// "BOOL" is preferred.
120 CCD_bool_in_ObjC = 1,
122 /// Adjustment for KVC code pattern priorities when it doesn't look
124 CCD_ProbablyNotObjCCollection = 15,
126 /// An Objective-C method being used as a property.
127 CCD_MethodAsProperty = 2,
129 /// An Objective-C block property completed as a setter with a
130 /// block placeholder.
131 CCD_BlockPropertySetter = 3
134 /// Priority value factors by which we will divide or multiply the
135 /// priority of a code-completion result.
137 /// Divide by this factor when a code-completion result's type exactly
138 /// matches the type we expect.
139 CCF_ExactTypeMatch = 4,
141 /// Divide by this factor when a code-completion result's type is
142 /// similar to the type we expect (e.g., both arithmetic types, both
143 /// Objective-C object pointer types).
144 CCF_SimilarTypeMatch = 2
147 /// A simplified classification of types used when determining
148 /// "similar" types for code completion.
149 enum SimplifiedTypeClass {
161 /// Determine the simplified type class of the given canonical type.
162 SimplifiedTypeClass getSimplifiedTypeClass(CanQualType T);
164 /// Determine the type that this declaration will have if it is used
165 /// as a type or in an expression.
166 QualType getDeclUsageType(ASTContext &C, const NamedDecl *ND);
168 /// Determine the priority to be given to a macro code completion result
169 /// with the given name.
171 /// \param MacroName The name of the macro.
173 /// \param LangOpts Options describing the current language dialect.
175 /// \param PreferredTypeIsPointer Whether the preferred type for the context
176 /// of this macro is a pointer type.
177 unsigned getMacroUsagePriority(StringRef MacroName,
178 const LangOptions &LangOpts,
179 bool PreferredTypeIsPointer = false);
181 /// Determine the libclang cursor kind associated with the given
183 CXCursorKind getCursorKindForDecl(const Decl *D);
185 /// The context in which code completion occurred, so that the
186 /// code-completion consumer can process the results accordingly.
187 class CodeCompletionContext {
190 /// An unspecified code-completion context.
193 /// An unspecified code-completion context where we should also add
194 /// macro completions.
197 /// Code completion occurred within a "top-level" completion context,
198 /// e.g., at namespace or global scope.
201 /// Code completion occurred within an Objective-C interface,
202 /// protocol, or category interface.
205 /// Code completion occurred within an Objective-C implementation
206 /// or category implementation.
207 CCC_ObjCImplementation,
209 /// Code completion occurred within the instance variable list of
210 /// an Objective-C interface, implementation, or category implementation.
213 /// Code completion occurred within a class, struct, or union.
214 CCC_ClassStructUnion,
216 /// Code completion occurred where a statement (or declaration) is
217 /// expected in a function, method, or block.
220 /// Code completion occurred where an expression is expected.
223 /// Code completion occurred where an Objective-C message receiver
225 CCC_ObjCMessageReceiver,
227 /// Code completion occurred on the right-hand side of a member
228 /// access expression using the dot operator.
230 /// The results of this completion are the members of the type being
231 /// accessed. The type itself is available via
232 /// \c CodeCompletionContext::getType().
235 /// Code completion occurred on the right-hand side of a member
236 /// access expression using the arrow operator.
238 /// The results of this completion are the members of the type being
239 /// accessed. The type itself is available via
240 /// \c CodeCompletionContext::getType().
241 CCC_ArrowMemberAccess,
243 /// Code completion occurred on the right-hand side of an Objective-C
244 /// property access expression.
246 /// The results of this completion are the members of the type being
247 /// accessed. The type itself is available via
248 /// \c CodeCompletionContext::getType().
249 CCC_ObjCPropertyAccess,
251 /// Code completion occurred after the "enum" keyword, to indicate
252 /// an enumeration name.
255 /// Code completion occurred after the "union" keyword, to indicate
259 /// Code completion occurred after the "struct" or "class" keyword,
260 /// to indicate a struct or class name.
261 CCC_ClassOrStructTag,
263 /// Code completion occurred where a protocol name is expected.
264 CCC_ObjCProtocolName,
266 /// Code completion occurred where a namespace or namespace alias
270 /// Code completion occurred where a type name is expected.
273 /// Code completion occurred where a new name is expected.
276 /// Code completion occurred where both a new name and an existing symbol is
280 /// Code completion occurred where an existing name(such as type, function
281 /// or variable) is expected.
284 /// Code completion occurred where an macro is being defined.
287 /// Code completion occurred where a macro name is expected
288 /// (without any arguments, in the case of a function-like macro).
291 /// Code completion occurred within a preprocessor expression.
292 CCC_PreprocessorExpression,
294 /// Code completion occurred where a preprocessor directive is
296 CCC_PreprocessorDirective,
298 /// Code completion occurred in a context where natural language is
299 /// expected, e.g., a comment or string literal.
301 /// This context usually implies that no completions should be added,
302 /// unless they come from an appropriate natural-language dictionary.
305 /// Code completion for a selector, as in an \@selector expression.
308 /// Code completion within a type-qualifier list.
311 /// Code completion in a parenthesized expression, which means that
312 /// we may also have types here in C and Objective-C (as well as in C++).
313 CCC_ParenthesizedExpression,
315 /// Code completion where an Objective-C instance message is
317 CCC_ObjCInstanceMessage,
319 /// Code completion where an Objective-C class message is expected.
320 CCC_ObjCClassMessage,
322 /// Code completion where the name of an Objective-C class is
324 CCC_ObjCInterfaceName,
326 /// Code completion where an Objective-C category name is expected.
327 CCC_ObjCCategoryName,
329 /// Code completion inside the filename part of a #include directive.
332 /// An unknown context, in which we are recovering from a parsing
333 /// error and don't know which completions we should give.
337 using VisitedContextSet = llvm::SmallPtrSet<DeclContext *, 8>;
342 /// The type that would prefer to see at this point (e.g., the type
343 /// of an initializer or function parameter).
344 QualType PreferredType;
346 /// The type of the base object in a member access expression.
349 /// The identifiers for Objective-C selector parts.
350 ArrayRef<IdentifierInfo *> SelIdents;
352 /// The scope specifier that comes before the completion token e.g.
354 llvm::Optional<CXXScopeSpec> ScopeSpecifier;
356 /// A set of declaration contexts visited by Sema when doing lookup for
358 VisitedContextSet VisitedContexts;
361 /// Construct a new code-completion context of the given kind.
362 CodeCompletionContext(Kind CCKind) : CCKind(CCKind), SelIdents(None) {}
364 /// Construct a new code-completion context of the given kind.
365 CodeCompletionContext(Kind CCKind, QualType T,
366 ArrayRef<IdentifierInfo *> SelIdents = None)
367 : CCKind(CCKind), SelIdents(SelIdents) {
368 if (CCKind == CCC_DotMemberAccess || CCKind == CCC_ArrowMemberAccess ||
369 CCKind == CCC_ObjCPropertyAccess || CCKind == CCC_ObjCClassMessage ||
370 CCKind == CCC_ObjCInstanceMessage)
376 /// Retrieve the kind of code-completion context.
377 Kind getKind() const { return CCKind; }
379 /// Retrieve the type that this expression would prefer to have, e.g.,
380 /// if the expression is a variable initializer or a function argument, the
381 /// type of the corresponding variable or function parameter.
382 QualType getPreferredType() const { return PreferredType; }
383 void setPreferredType(QualType T) { PreferredType = T; }
385 /// Retrieve the type of the base object in a member-access
387 QualType getBaseType() const { return BaseType; }
389 /// Retrieve the Objective-C selector identifiers.
390 ArrayRef<IdentifierInfo *> getSelIdents() const { return SelIdents; }
392 /// Determines whether we want C++ constructors as results within this
394 bool wantConstructorResults() const;
396 /// Sets the scope specifier that comes before the completion token.
397 /// This is expected to be set in code completions on qualfied specifiers
399 void setCXXScopeSpecifier(CXXScopeSpec SS) {
400 this->ScopeSpecifier = std::move(SS);
403 /// Adds a visited context.
404 void addVisitedContext(DeclContext *Ctx) {
405 VisitedContexts.insert(Ctx);
408 /// Retrieves all visited contexts.
409 const VisitedContextSet &getVisitedContexts() const {
410 return VisitedContexts;
413 llvm::Optional<const CXXScopeSpec *> getCXXScopeSpecifier() {
415 return ScopeSpecifier.getPointer();
420 /// Get string representation of \p Kind, useful for for debugging.
421 llvm::StringRef getCompletionKindString(CodeCompletionContext::Kind Kind);
423 /// A "string" used to describe how code completion can
424 /// be performed for an entity.
426 /// A code completion string typically shows how a particular entity can be
427 /// used. For example, the code completion string for a function would show
428 /// the syntax to call it, including the parentheses, placeholders for the
430 class CodeCompletionString {
432 /// The different kinds of "chunks" that can occur within a code
433 /// completion string.
435 /// The piece of text that the user is expected to type to
436 /// match the code-completion string, typically a keyword or the name of a
437 /// declarator or macro.
440 /// A piece of text that should be placed in the buffer, e.g.,
441 /// parentheses or a comma in a function call.
444 /// A code completion string that is entirely optional. For example,
445 /// an optional code completion string that describes the default arguments
446 /// in a function call.
449 /// A string that acts as a placeholder for, e.g., a function
453 /// A piece of text that describes something about the result but
454 /// should not be inserted into the buffer.
456 /// A piece of text that describes the type of an entity or, for
457 /// functions and methods, the return type.
460 /// A piece of text that describes the parameter that corresponds
461 /// to the code-completion location within a function call, message send,
462 /// macro invocation, etc.
465 /// A left parenthesis ('(').
468 /// A right parenthesis (')').
471 /// A left bracket ('[').
474 /// A right bracket (']').
477 /// A left brace ('{').
480 /// A right brace ('}').
483 /// A left angle bracket ('<').
486 /// A right angle bracket ('>').
489 /// A comma separator (',').
495 /// A semicolon (';').
501 /// Horizontal whitespace (' ').
504 /// Vertical whitespace ('\\n' or '\\r\\n', depending on the
509 /// One piece of the code completion string.
511 /// The kind of data stored in this piece of the code completion
513 ChunkKind Kind = CK_Text;
516 /// The text string associated with a CK_Text, CK_Placeholder,
517 /// CK_Informative, or CK_Comma chunk.
518 /// The string is owned by the chunk and will be deallocated
519 /// (with delete[]) when the chunk is destroyed.
522 /// The code completion string associated with a CK_Optional chunk.
523 /// The optional code completion string is owned by the chunk, and will
524 /// be deallocated (with delete) when the chunk is destroyed.
525 CodeCompletionString *Optional;
528 Chunk() : Text(nullptr) {}
530 explicit Chunk(ChunkKind Kind, const char *Text = "");
532 /// Create a new text chunk.
533 static Chunk CreateText(const char *Text);
535 /// Create a new optional chunk.
536 static Chunk CreateOptional(CodeCompletionString *Optional);
538 /// Create a new placeholder chunk.
539 static Chunk CreatePlaceholder(const char *Placeholder);
541 /// Create a new informative chunk.
542 static Chunk CreateInformative(const char *Informative);
544 /// Create a new result type chunk.
545 static Chunk CreateResultType(const char *ResultType);
547 /// Create a new current-parameter chunk.
548 static Chunk CreateCurrentParameter(const char *CurrentParameter);
552 friend class CodeCompletionBuilder;
553 friend class CodeCompletionResult;
555 /// The number of chunks stored in this string.
556 unsigned NumChunks : 16;
558 /// The number of annotations for this code-completion result.
559 unsigned NumAnnotations : 16;
561 /// The priority of this code-completion string.
562 unsigned Priority : 16;
564 /// The availability of this code-completion result.
565 unsigned Availability : 2;
567 /// The name of the parent context.
568 StringRef ParentName;
570 /// A brief documentation comment attached to the declaration of
571 /// entity being completed by this result.
572 const char *BriefComment;
574 CodeCompletionString(const Chunk *Chunks, unsigned NumChunks,
575 unsigned Priority, CXAvailabilityKind Availability,
576 const char **Annotations, unsigned NumAnnotations,
577 StringRef ParentName,
578 const char *BriefComment);
579 ~CodeCompletionString() = default;
582 CodeCompletionString(const CodeCompletionString &) = delete;
583 CodeCompletionString &operator=(const CodeCompletionString &) = delete;
585 using iterator = const Chunk *;
587 iterator begin() const { return reinterpret_cast<const Chunk *>(this + 1); }
588 iterator end() const { return begin() + NumChunks; }
589 bool empty() const { return NumChunks == 0; }
590 unsigned size() const { return NumChunks; }
592 const Chunk &operator[](unsigned I) const {
593 assert(I < size() && "Chunk index out-of-range");
597 /// Returns the text in the TypedText chunk.
598 const char *getTypedText() const;
600 /// Retrieve the priority of this code completion result.
601 unsigned getPriority() const { return Priority; }
603 /// Retrieve the availability of this code completion result.
604 unsigned getAvailability() const { return Availability; }
606 /// Retrieve the number of annotations for this code completion result.
607 unsigned getAnnotationCount() const;
609 /// Retrieve the annotation string specified by \c AnnotationNr.
610 const char *getAnnotation(unsigned AnnotationNr) const;
612 /// Retrieve the name of the parent context.
613 StringRef getParentContextName() const {
617 const char *getBriefComment() const {
621 /// Retrieve a string representation of the code completion string,
622 /// which is mainly useful for debugging.
623 std::string getAsString() const;
626 /// An allocator used specifically for the purpose of code completion.
627 class CodeCompletionAllocator : public llvm::BumpPtrAllocator {
629 /// Copy the given string into this allocator.
630 const char *CopyString(const Twine &String);
633 /// Allocator for a cached set of global code completions.
634 class GlobalCodeCompletionAllocator : public CodeCompletionAllocator {};
636 class CodeCompletionTUInfo {
637 llvm::DenseMap<const DeclContext *, StringRef> ParentNames;
638 std::shared_ptr<GlobalCodeCompletionAllocator> AllocatorRef;
641 explicit CodeCompletionTUInfo(
642 std::shared_ptr<GlobalCodeCompletionAllocator> Allocator)
643 : AllocatorRef(std::move(Allocator)) {}
645 std::shared_ptr<GlobalCodeCompletionAllocator> getAllocatorRef() const {
649 CodeCompletionAllocator &getAllocator() const {
650 assert(AllocatorRef);
651 return *AllocatorRef;
654 StringRef getParentName(const DeclContext *DC);
661 /// A builder class used to construct new code-completion strings.
662 class CodeCompletionBuilder {
664 using Chunk = CodeCompletionString::Chunk;
667 CodeCompletionAllocator &Allocator;
668 CodeCompletionTUInfo &CCTUInfo;
669 unsigned Priority = 0;
670 CXAvailabilityKind Availability = CXAvailability_Available;
671 StringRef ParentName;
672 const char *BriefComment = nullptr;
674 /// The chunks stored in this string.
675 SmallVector<Chunk, 4> Chunks;
677 SmallVector<const char *, 2> Annotations;
680 CodeCompletionBuilder(CodeCompletionAllocator &Allocator,
681 CodeCompletionTUInfo &CCTUInfo)
682 : Allocator(Allocator), CCTUInfo(CCTUInfo) {}
684 CodeCompletionBuilder(CodeCompletionAllocator &Allocator,
685 CodeCompletionTUInfo &CCTUInfo,
686 unsigned Priority, CXAvailabilityKind Availability)
687 : Allocator(Allocator), CCTUInfo(CCTUInfo), Priority(Priority),
688 Availability(Availability) {}
690 /// Retrieve the allocator into which the code completion
691 /// strings should be allocated.
692 CodeCompletionAllocator &getAllocator() const { return Allocator; }
694 CodeCompletionTUInfo &getCodeCompletionTUInfo() const { return CCTUInfo; }
696 /// Take the resulting completion string.
698 /// This operation can only be performed once.
699 CodeCompletionString *TakeString();
701 /// Add a new typed-text chunk.
702 void AddTypedTextChunk(const char *Text);
704 /// Add a new text chunk.
705 void AddTextChunk(const char *Text);
707 /// Add a new optional chunk.
708 void AddOptionalChunk(CodeCompletionString *Optional);
710 /// Add a new placeholder chunk.
711 void AddPlaceholderChunk(const char *Placeholder);
713 /// Add a new informative chunk.
714 void AddInformativeChunk(const char *Text);
716 /// Add a new result-type chunk.
717 void AddResultTypeChunk(const char *ResultType);
719 /// Add a new current-parameter chunk.
720 void AddCurrentParameterChunk(const char *CurrentParameter);
723 void AddChunk(CodeCompletionString::ChunkKind CK, const char *Text = "");
725 void AddAnnotation(const char *A) { Annotations.push_back(A); }
727 /// Add the parent context information to this code completion.
728 void addParentContext(const DeclContext *DC);
730 const char *getBriefComment() const { return BriefComment; }
731 void addBriefComment(StringRef Comment);
733 StringRef getParentName() const { return ParentName; }
736 /// Captures a result of code completion.
737 class CodeCompletionResult {
739 /// Describes the kind of result generated.
741 /// Refers to a declaration.
744 /// Refers to a keyword or symbol.
747 /// Refers to a macro.
750 /// Refers to a precomputed pattern.
754 /// When Kind == RK_Declaration or RK_Pattern, the declaration we are
755 /// referring to. In the latter case, the declaration might be NULL.
756 const NamedDecl *Declaration = nullptr;
759 /// When Kind == RK_Keyword, the string representing the keyword
760 /// or symbol's spelling.
763 /// When Kind == RK_Pattern, the code-completion string that
764 /// describes the completion text to insert.
765 CodeCompletionString *Pattern;
767 /// When Kind == RK_Macro, the identifier that refers to a macro.
768 const IdentifierInfo *Macro;
771 /// The priority of this particular code-completion result.
774 /// Specifies which parameter (of a function, Objective-C method,
775 /// macro, etc.) we should start with when formatting the result.
776 unsigned StartParameter = 0;
778 /// The kind of result stored here.
781 /// The cursor kind that describes this result.
782 CXCursorKind CursorKind;
784 /// The availability of this result.
785 CXAvailabilityKind Availability = CXAvailability_Available;
787 /// Fix-its that *must* be applied before inserting the text for the
788 /// corresponding completion.
790 /// By default, CodeCompletionBuilder only returns completions with empty
791 /// fix-its. Extra completions with non-empty fix-its should be explicitly
792 /// requested by setting CompletionOptions::IncludeFixIts.
794 /// For the clients to be able to compute position of the cursor after
795 /// applying fix-its, the following conditions are guaranteed to hold for
796 /// RemoveRange of the stored fix-its:
797 /// - Ranges in the fix-its are guaranteed to never contain the completion
798 /// point (or identifier under completion point, if any) inside them, except
799 /// at the start or at the end of the range.
800 /// - If a fix-it range starts or ends with completion point (or starts or
801 /// ends after the identifier under completion point), it will contain at
802 /// least one character. It allows to unambiguously recompute completion
803 /// point after applying the fix-it.
805 /// The intuition is that provided fix-its change code around the identifier
806 /// we complete, but are not allowed to touch the identifier itself or the
807 /// completion point. One example of completions with corrections are the ones
808 /// replacing '.' with '->' and vice versa:
810 /// std::unique_ptr<std::vector<int>> vec_ptr;
811 /// In 'vec_ptr.^', one of the completions is 'push_back', it requires
812 /// replacing '.' with '->'.
813 /// In 'vec_ptr->^', one of the completions is 'release', it requires
814 /// replacing '->' with '.'.
815 std::vector<FixItHint> FixIts;
817 /// Whether this result is hidden by another name.
820 /// Whether this is a class member from base class.
821 bool InBaseClass : 1;
823 /// Whether this result was found via lookup into a base class.
824 bool QualifierIsInformative : 1;
826 /// Whether this declaration is the beginning of a
827 /// nested-name-specifier and, therefore, should be followed by '::'.
828 bool StartsNestedNameSpecifier : 1;
830 /// Whether all parameters (of a function, Objective-C
831 /// method, etc.) should be considered "informative".
832 bool AllParametersAreInformative : 1;
834 /// Whether we're completing a declaration of the given entity,
835 /// rather than a use of that entity.
836 bool DeclaringEntity : 1;
838 /// If the result should have a nested-name-specifier, this is it.
839 /// When \c QualifierIsInformative, the nested-name-specifier is
840 /// informative rather than required.
841 NestedNameSpecifier *Qualifier = nullptr;
843 /// If this Decl was unshadowed by using declaration, this can store a
844 /// pointer to the UsingShadowDecl which was used in the unshadowing process.
845 /// This information can be used to uprank CodeCompletionResults / which have
846 /// corresponding `using decl::qualified::name;` nearby.
847 const UsingShadowDecl *ShadowDecl = nullptr;
849 /// If the result is RK_Macro, this can store the information about the macro
850 /// definition. This should be set in most cases but can be missing when
851 /// the macro has been undefined.
852 const MacroInfo *MacroDefInfo = nullptr;
854 /// Build a result that refers to a declaration.
855 CodeCompletionResult(const NamedDecl *Declaration, unsigned Priority,
856 NestedNameSpecifier *Qualifier = nullptr,
857 bool QualifierIsInformative = false,
858 bool Accessible = true,
859 std::vector<FixItHint> FixIts = std::vector<FixItHint>())
860 : Declaration(Declaration), Priority(Priority), Kind(RK_Declaration),
861 FixIts(std::move(FixIts)), Hidden(false), InBaseClass(false),
862 QualifierIsInformative(QualifierIsInformative),
863 StartsNestedNameSpecifier(false), AllParametersAreInformative(false),
864 DeclaringEntity(false), Qualifier(Qualifier) {
865 // FIXME: Add assert to check FixIts range requirements.
866 computeCursorKindAndAvailability(Accessible);
869 /// Build a result that refers to a keyword or symbol.
870 CodeCompletionResult(const char *Keyword, unsigned Priority = CCP_Keyword)
871 : Keyword(Keyword), Priority(Priority), Kind(RK_Keyword),
872 CursorKind(CXCursor_NotImplemented), Hidden(false), InBaseClass(false),
873 QualifierIsInformative(false), StartsNestedNameSpecifier(false),
874 AllParametersAreInformative(false), DeclaringEntity(false) {}
876 /// Build a result that refers to a macro.
877 CodeCompletionResult(const IdentifierInfo *Macro,
878 const MacroInfo *MI = nullptr,
879 unsigned Priority = CCP_Macro)
880 : Macro(Macro), Priority(Priority), Kind(RK_Macro),
881 CursorKind(CXCursor_MacroDefinition), Hidden(false), InBaseClass(false),
882 QualifierIsInformative(false), StartsNestedNameSpecifier(false),
883 AllParametersAreInformative(false), DeclaringEntity(false),
886 /// Build a result that refers to a pattern.
887 CodeCompletionResult(
888 CodeCompletionString *Pattern, unsigned Priority = CCP_CodePattern,
889 CXCursorKind CursorKind = CXCursor_NotImplemented,
890 CXAvailabilityKind Availability = CXAvailability_Available,
891 const NamedDecl *D = nullptr)
892 : Declaration(D), Pattern(Pattern), Priority(Priority), Kind(RK_Pattern),
893 CursorKind(CursorKind), Availability(Availability), Hidden(false),
894 InBaseClass(false), QualifierIsInformative(false),
895 StartsNestedNameSpecifier(false), AllParametersAreInformative(false),
896 DeclaringEntity(false) {}
898 /// Build a result that refers to a pattern with an associated
900 CodeCompletionResult(CodeCompletionString *Pattern, const NamedDecl *D,
902 : Declaration(D), Pattern(Pattern), Priority(Priority), Kind(RK_Pattern),
903 Hidden(false), InBaseClass(false), QualifierIsInformative(false),
904 StartsNestedNameSpecifier(false), AllParametersAreInformative(false),
905 DeclaringEntity(false) {
906 computeCursorKindAndAvailability();
909 /// Retrieve the declaration stored in this result. This might be nullptr if
910 /// Kind is RK_Pattern.
911 const NamedDecl *getDeclaration() const {
912 assert(((Kind == RK_Declaration) || (Kind == RK_Pattern)) &&
913 "Not a declaration or pattern result");
917 /// Retrieve the keyword stored in this result.
918 const char *getKeyword() const {
919 assert(Kind == RK_Keyword && "Not a keyword result");
923 /// Create a new code-completion string that describes how to insert
924 /// this result into a program.
926 /// \param S The semantic analysis that created the result.
928 /// \param Allocator The allocator that will be used to allocate the
930 CodeCompletionString *CreateCodeCompletionString(Sema &S,
931 const CodeCompletionContext &CCContext,
932 CodeCompletionAllocator &Allocator,
933 CodeCompletionTUInfo &CCTUInfo,
934 bool IncludeBriefComments);
935 CodeCompletionString *CreateCodeCompletionString(ASTContext &Ctx,
937 const CodeCompletionContext &CCContext,
938 CodeCompletionAllocator &Allocator,
939 CodeCompletionTUInfo &CCTUInfo,
940 bool IncludeBriefComments);
941 /// Creates a new code-completion string for the macro result. Similar to the
942 /// above overloads, except this only requires preprocessor information.
943 /// The result kind must be `RK_Macro`.
944 CodeCompletionString *
945 CreateCodeCompletionStringForMacro(Preprocessor &PP,
946 CodeCompletionAllocator &Allocator,
947 CodeCompletionTUInfo &CCTUInfo);
949 CodeCompletionString *createCodeCompletionStringForDecl(
950 Preprocessor &PP, ASTContext &Ctx, CodeCompletionBuilder &Result,
951 bool IncludeBriefComments, const CodeCompletionContext &CCContext,
952 PrintingPolicy &Policy);
954 CodeCompletionString *createCodeCompletionStringForOverride(
955 Preprocessor &PP, ASTContext &Ctx, CodeCompletionBuilder &Result,
956 bool IncludeBriefComments, const CodeCompletionContext &CCContext,
957 PrintingPolicy &Policy);
959 /// Retrieve the name that should be used to order a result.
961 /// If the name needs to be constructed as a string, that string will be
962 /// saved into Saved and the returned StringRef will refer to it.
963 StringRef getOrderedName(std::string &Saved) const;
966 void computeCursorKindAndAvailability(bool Accessible = true);
969 bool operator<(const CodeCompletionResult &X, const CodeCompletionResult &Y);
971 inline bool operator>(const CodeCompletionResult &X,
972 const CodeCompletionResult &Y) {
976 inline bool operator<=(const CodeCompletionResult &X,
977 const CodeCompletionResult &Y) {
981 inline bool operator>=(const CodeCompletionResult &X,
982 const CodeCompletionResult &Y) {
986 raw_ostream &operator<<(raw_ostream &OS,
987 const CodeCompletionString &CCS);
989 /// Abstract interface for a consumer of code-completion
991 class CodeCompleteConsumer {
993 const CodeCompleteOptions CodeCompleteOpts;
996 class OverloadCandidate {
998 /// Describes the type of overload candidate.
1000 /// The candidate is a function declaration.
1003 /// The candidate is a function template.
1004 CK_FunctionTemplate,
1006 /// The "candidate" is actually a variable, expression, or block
1007 /// for which we only have a function prototype.
1012 /// The kind of overload candidate.
1016 /// The function overload candidate, available when
1017 /// Kind == CK_Function.
1018 FunctionDecl *Function;
1020 /// The function template overload candidate, available when
1021 /// Kind == CK_FunctionTemplate.
1022 FunctionTemplateDecl *FunctionTemplate;
1024 /// The function type that describes the entity being called,
1025 /// when Kind == CK_FunctionType.
1026 const FunctionType *Type;
1030 OverloadCandidate(FunctionDecl *Function)
1031 : Kind(CK_Function), Function(Function) {}
1033 OverloadCandidate(FunctionTemplateDecl *FunctionTemplateDecl)
1034 : Kind(CK_FunctionTemplate), FunctionTemplate(FunctionTemplateDecl) {}
1036 OverloadCandidate(const FunctionType *Type)
1037 : Kind(CK_FunctionType), Type(Type) {}
1039 /// Determine the kind of overload candidate.
1040 CandidateKind getKind() const { return Kind; }
1042 /// Retrieve the function overload candidate or the templated
1043 /// function declaration for a function template.
1044 FunctionDecl *getFunction() const;
1046 /// Retrieve the function template overload candidate.
1047 FunctionTemplateDecl *getFunctionTemplate() const {
1048 assert(getKind() == CK_FunctionTemplate && "Not a function template");
1049 return FunctionTemplate;
1052 /// Retrieve the function type of the entity, regardless of how the
1053 /// function is stored.
1054 const FunctionType *getFunctionType() const;
1056 /// Create a new code-completion string that describes the function
1057 /// signature of this overload candidate.
1058 CodeCompletionString *CreateSignatureString(unsigned CurrentArg,
1060 CodeCompletionAllocator &Allocator,
1061 CodeCompletionTUInfo &CCTUInfo,
1062 bool IncludeBriefComments) const;
1065 CodeCompleteConsumer(const CodeCompleteOptions &CodeCompleteOpts)
1066 : CodeCompleteOpts(CodeCompleteOpts) {}
1068 /// Whether the code-completion consumer wants to see macros.
1069 bool includeMacros() const {
1070 return CodeCompleteOpts.IncludeMacros;
1073 /// Whether the code-completion consumer wants to see code patterns.
1074 bool includeCodePatterns() const {
1075 return CodeCompleteOpts.IncludeCodePatterns;
1078 /// Whether to include global (top-level) declaration results.
1079 bool includeGlobals() const { return CodeCompleteOpts.IncludeGlobals; }
1081 /// Whether to include declarations in namespace contexts (including
1082 /// the global namespace). If this is false, `includeGlobals()` will be
1084 bool includeNamespaceLevelDecls() const {
1085 return CodeCompleteOpts.IncludeNamespaceLevelDecls;
1088 /// Whether to include brief documentation comments within the set of
1089 /// code completions returned.
1090 bool includeBriefComments() const {
1091 return CodeCompleteOpts.IncludeBriefComments;
1094 /// Whether to include completion items with small fix-its, e.g. change
1095 /// '.' to '->' on member access, etc.
1096 bool includeFixIts() const { return CodeCompleteOpts.IncludeFixIts; }
1098 /// Hint whether to load data from the external AST in order to provide
1099 /// full results. If false, declarations from the preamble may be omitted.
1100 bool loadExternal() const {
1101 return CodeCompleteOpts.LoadExternal;
1104 /// Deregisters and destroys this code-completion consumer.
1105 virtual ~CodeCompleteConsumer();
1107 /// \name Code-completion filtering
1108 /// Check if the result should be filtered out.
1109 virtual bool isResultFilteredOut(StringRef Filter,
1110 CodeCompletionResult Results) {
1114 /// \name Code-completion callbacks
1116 /// Process the finalized code-completion results.
1117 virtual void ProcessCodeCompleteResults(Sema &S,
1118 CodeCompletionContext Context,
1119 CodeCompletionResult *Results,
1120 unsigned NumResults) {}
1122 /// \param S the semantic-analyzer object for which code-completion is being
1125 /// \param CurrentArg the index of the current argument.
1127 /// \param Candidates an array of overload candidates.
1129 /// \param NumCandidates the number of overload candidates
1131 /// \param OpenParLoc location of the opening parenthesis of the argument
1133 virtual void ProcessOverloadCandidates(Sema &S, unsigned CurrentArg,
1134 OverloadCandidate *Candidates,
1135 unsigned NumCandidates,
1136 SourceLocation OpenParLoc) {}
1139 /// Retrieve the allocator that will be used to allocate
1140 /// code completion strings.
1141 virtual CodeCompletionAllocator &getAllocator() = 0;
1143 virtual CodeCompletionTUInfo &getCodeCompletionTUInfo() = 0;
1146 /// Get the documentation comment used to produce
1147 /// CodeCompletionString::BriefComment for RK_Declaration.
1148 const RawComment *getCompletionComment(const ASTContext &Ctx,
1149 const NamedDecl *Decl);
1151 /// Get the documentation comment used to produce
1152 /// CodeCompletionString::BriefComment for RK_Pattern.
1153 const RawComment *getPatternCompletionComment(const ASTContext &Ctx,
1154 const NamedDecl *Decl);
1156 /// Get the documentation comment used to produce
1157 /// CodeCompletionString::BriefComment for OverloadCandidate.
1159 getParameterComment(const ASTContext &Ctx,
1160 const CodeCompleteConsumer::OverloadCandidate &Result,
1163 /// A simple code-completion consumer that prints the results it
1164 /// receives in a simple format.
1165 class PrintingCodeCompleteConsumer : public CodeCompleteConsumer {
1166 /// The raw output stream.
1169 CodeCompletionTUInfo CCTUInfo;
1172 /// Create a new printing code-completion consumer that prints its
1173 /// results to the given raw output stream.
1174 PrintingCodeCompleteConsumer(const CodeCompleteOptions &CodeCompleteOpts,
1176 : CodeCompleteConsumer(CodeCompleteOpts), OS(OS),
1177 CCTUInfo(std::make_shared<GlobalCodeCompletionAllocator>()) {}
1179 /// Prints the finalized code-completion results.
1180 void ProcessCodeCompleteResults(Sema &S, CodeCompletionContext Context,
1181 CodeCompletionResult *Results,
1182 unsigned NumResults) override;
1184 void ProcessOverloadCandidates(Sema &S, unsigned CurrentArg,
1185 OverloadCandidate *Candidates,
1186 unsigned NumCandidates,
1187 SourceLocation OpenParLoc) override;
1189 bool isResultFilteredOut(StringRef Filter, CodeCompletionResult Results) override;
1191 CodeCompletionAllocator &getAllocator() override {
1192 return CCTUInfo.getAllocator();
1195 CodeCompletionTUInfo &getCodeCompletionTUInfo() override { return CCTUInfo; }
1198 } // namespace clang
1200 #endif // LLVM_CLANG_SEMA_CODECOMPLETECONSUMER_H