1 //===- CodeCompleteConsumer.cpp - Code Completion Interface ---------------===//
2 //
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
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements the CodeCompleteConsumer class.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "clang/Sema/CodeCompleteConsumer.h"
14 #include "clang-c/Index.h"
15 #include "clang/AST/Decl.h"
16 #include "clang/AST/DeclBase.h"
17 #include "clang/AST/DeclObjC.h"
18 #include "clang/AST/DeclTemplate.h"
19 #include "clang/AST/DeclarationName.h"
20 #include "clang/AST/Type.h"
21 #include "clang/Basic/IdentifierTable.h"
22 #include "clang/Lex/Preprocessor.h"
23 #include "clang/Sema/Sema.h"
24 #include "llvm/ADT/SmallString.h"
25 #include "llvm/ADT/SmallVector.h"
26 #include "llvm/ADT/StringExtras.h"
27 #include "llvm/ADT/StringRef.h"
28 #include "llvm/ADT/Twine.h"
29 #include "llvm/Support/Casting.h"
30 #include "llvm/Support/Compiler.h"
31 #include "llvm/Support/ErrorHandling.h"
32 #include "llvm/Support/FormatVariadic.h"
33 #include "llvm/Support/raw_ostream.h"
34 #include <algorithm>
35 #include <cassert>
36 #include <cstdint>
37 #include <string>
38
39 using namespace clang;
40
41 //===----------------------------------------------------------------------===//
42 // Code completion context implementation
43 //===----------------------------------------------------------------------===//
44
wantConstructorResults() const45 bool CodeCompletionContext::wantConstructorResults() const {
46 switch (CCKind) {
47 case CCC_Recovery:
48 case CCC_Statement:
49 case CCC_Expression:
50 case CCC_ObjCMessageReceiver:
51 case CCC_ParenthesizedExpression:
52 case CCC_Symbol:
53 case CCC_SymbolOrNewName:
54 case CCC_TopLevelOrExpression:
55 return true;
56
57 case CCC_TopLevel:
58 case CCC_ObjCInterface:
59 case CCC_ObjCImplementation:
60 case CCC_ObjCIvarList:
61 case CCC_ClassStructUnion:
62 case CCC_DotMemberAccess:
63 case CCC_ArrowMemberAccess:
64 case CCC_ObjCPropertyAccess:
65 case CCC_EnumTag:
66 case CCC_UnionTag:
67 case CCC_ClassOrStructTag:
68 case CCC_ObjCProtocolName:
69 case CCC_Namespace:
70 case CCC_Type:
71 case CCC_NewName:
72 case CCC_MacroName:
73 case CCC_MacroNameUse:
74 case CCC_PreprocessorExpression:
75 case CCC_PreprocessorDirective:
76 case CCC_NaturalLanguage:
77 case CCC_SelectorName:
78 case CCC_TypeQualifiers:
79 case CCC_Other:
80 case CCC_OtherWithMacros:
81 case CCC_ObjCInstanceMessage:
82 case CCC_ObjCClassMessage:
83 case CCC_ObjCInterfaceName:
84 case CCC_ObjCCategoryName:
85 case CCC_IncludedFile:
86 case CCC_Attribute:
87 case CCC_ObjCClassForwardDecl:
88 return false;
89 }
90
91 llvm_unreachable("Invalid CodeCompletionContext::Kind!");
92 }
93
getCompletionKindString(CodeCompletionContext::Kind Kind)94 StringRef clang::getCompletionKindString(CodeCompletionContext::Kind Kind) {
95 using CCKind = CodeCompletionContext::Kind;
96 switch (Kind) {
97 case CCKind::CCC_Other:
98 return "Other";
99 case CCKind::CCC_OtherWithMacros:
100 return "OtherWithMacros";
101 case CCKind::CCC_TopLevel:
102 return "TopLevel";
103 case CCKind::CCC_ObjCInterface:
104 return "ObjCInterface";
105 case CCKind::CCC_ObjCImplementation:
106 return "ObjCImplementation";
107 case CCKind::CCC_ObjCIvarList:
108 return "ObjCIvarList";
109 case CCKind::CCC_ClassStructUnion:
110 return "ClassStructUnion";
111 case CCKind::CCC_Statement:
112 return "Statement";
113 case CCKind::CCC_Expression:
114 return "Expression";
115 case CCKind::CCC_ObjCMessageReceiver:
116 return "ObjCMessageReceiver";
117 case CCKind::CCC_DotMemberAccess:
118 return "DotMemberAccess";
119 case CCKind::CCC_ArrowMemberAccess:
120 return "ArrowMemberAccess";
121 case CCKind::CCC_ObjCPropertyAccess:
122 return "ObjCPropertyAccess";
123 case CCKind::CCC_EnumTag:
124 return "EnumTag";
125 case CCKind::CCC_UnionTag:
126 return "UnionTag";
127 case CCKind::CCC_ClassOrStructTag:
128 return "ClassOrStructTag";
129 case CCKind::CCC_ObjCProtocolName:
130 return "ObjCProtocolName";
131 case CCKind::CCC_Namespace:
132 return "Namespace";
133 case CCKind::CCC_Type:
134 return "Type";
135 case CCKind::CCC_NewName:
136 return "NewName";
137 case CCKind::CCC_Symbol:
138 return "Symbol";
139 case CCKind::CCC_SymbolOrNewName:
140 return "SymbolOrNewName";
141 case CCKind::CCC_MacroName:
142 return "MacroName";
143 case CCKind::CCC_MacroNameUse:
144 return "MacroNameUse";
145 case CCKind::CCC_PreprocessorExpression:
146 return "PreprocessorExpression";
147 case CCKind::CCC_PreprocessorDirective:
148 return "PreprocessorDirective";
149 case CCKind::CCC_NaturalLanguage:
150 return "NaturalLanguage";
151 case CCKind::CCC_SelectorName:
152 return "SelectorName";
153 case CCKind::CCC_TypeQualifiers:
154 return "TypeQualifiers";
155 case CCKind::CCC_ParenthesizedExpression:
156 return "ParenthesizedExpression";
157 case CCKind::CCC_ObjCInstanceMessage:
158 return "ObjCInstanceMessage";
159 case CCKind::CCC_ObjCClassMessage:
160 return "ObjCClassMessage";
161 case CCKind::CCC_ObjCInterfaceName:
162 return "ObjCInterfaceName";
163 case CCKind::CCC_ObjCCategoryName:
164 return "ObjCCategoryName";
165 case CCKind::CCC_IncludedFile:
166 return "IncludedFile";
167 case CCKind::CCC_Attribute:
168 return "Attribute";
169 case CCKind::CCC_Recovery:
170 return "Recovery";
171 case CCKind::CCC_ObjCClassForwardDecl:
172 return "ObjCClassForwardDecl";
173 case CCKind::CCC_TopLevelOrExpression:
174 return "ReplTopLevel";
175 }
176 llvm_unreachable("Invalid CodeCompletionContext::Kind!");
177 }
178
179 //===----------------------------------------------------------------------===//
180 // Code completion string implementation
181 //===----------------------------------------------------------------------===//
182
Chunk(ChunkKind Kind,const char * Text)183 CodeCompletionString::Chunk::Chunk(ChunkKind Kind, const char *Text)
184 : Kind(Kind), Text("") {
185 switch (Kind) {
186 case CK_TypedText:
187 case CK_Text:
188 case CK_Placeholder:
189 case CK_Informative:
190 case CK_ResultType:
191 case CK_CurrentParameter:
192 this->Text = Text;
193 break;
194
195 case CK_Optional:
196 llvm_unreachable("Optional strings cannot be created from text");
197
198 case CK_LeftParen:
199 this->Text = "(";
200 break;
201
202 case CK_RightParen:
203 this->Text = ")";
204 break;
205
206 case CK_LeftBracket:
207 this->Text = "[";
208 break;
209
210 case CK_RightBracket:
211 this->Text = "]";
212 break;
213
214 case CK_LeftBrace:
215 this->Text = "{";
216 break;
217
218 case CK_RightBrace:
219 this->Text = "}";
220 break;
221
222 case CK_LeftAngle:
223 this->Text = "<";
224 break;
225
226 case CK_RightAngle:
227 this->Text = ">";
228 break;
229
230 case CK_Comma:
231 this->Text = ", ";
232 break;
233
234 case CK_Colon:
235 this->Text = ":";
236 break;
237
238 case CK_SemiColon:
239 this->Text = ";";
240 break;
241
242 case CK_Equal:
243 this->Text = " = ";
244 break;
245
246 case CK_HorizontalSpace:
247 this->Text = " ";
248 break;
249
250 case CK_VerticalSpace:
251 this->Text = "\n";
252 break;
253 }
254 }
255
256 CodeCompletionString::Chunk
CreateText(const char * Text)257 CodeCompletionString::Chunk::CreateText(const char *Text) {
258 return Chunk(CK_Text, Text);
259 }
260
261 CodeCompletionString::Chunk
CreateOptional(CodeCompletionString * Optional)262 CodeCompletionString::Chunk::CreateOptional(CodeCompletionString *Optional) {
263 Chunk Result;
264 Result.Kind = CK_Optional;
265 Result.Optional = Optional;
266 return Result;
267 }
268
269 CodeCompletionString::Chunk
CreatePlaceholder(const char * Placeholder)270 CodeCompletionString::Chunk::CreatePlaceholder(const char *Placeholder) {
271 return Chunk(CK_Placeholder, Placeholder);
272 }
273
274 CodeCompletionString::Chunk
CreateInformative(const char * Informative)275 CodeCompletionString::Chunk::CreateInformative(const char *Informative) {
276 return Chunk(CK_Informative, Informative);
277 }
278
279 CodeCompletionString::Chunk
CreateResultType(const char * ResultType)280 CodeCompletionString::Chunk::CreateResultType(const char *ResultType) {
281 return Chunk(CK_ResultType, ResultType);
282 }
283
CreateCurrentParameter(const char * CurrentParameter)284 CodeCompletionString::Chunk CodeCompletionString::Chunk::CreateCurrentParameter(
285 const char *CurrentParameter) {
286 return Chunk(CK_CurrentParameter, CurrentParameter);
287 }
288
CodeCompletionString(const Chunk * Chunks,unsigned NumChunks,unsigned Priority,CXAvailabilityKind Availability,const char ** Annotations,unsigned NumAnnotations,StringRef ParentName,const char * BriefComment)289 CodeCompletionString::CodeCompletionString(
290 const Chunk *Chunks, unsigned NumChunks, unsigned Priority,
291 CXAvailabilityKind Availability, const char **Annotations,
292 unsigned NumAnnotations, StringRef ParentName, const char *BriefComment)
293 : NumChunks(NumChunks), NumAnnotations(NumAnnotations), Priority(Priority),
294 Availability(Availability), ParentName(ParentName),
295 BriefComment(BriefComment) {
296 assert(NumChunks <= 0xffff);
297 assert(NumAnnotations <= 0xffff);
298
299 Chunk *StoredChunks = reinterpret_cast<Chunk *>(this + 1);
300 for (unsigned I = 0; I != NumChunks; ++I)
301 StoredChunks[I] = Chunks[I];
302
303 const char **StoredAnnotations =
304 reinterpret_cast<const char **>(StoredChunks + NumChunks);
305 for (unsigned I = 0; I != NumAnnotations; ++I)
306 StoredAnnotations[I] = Annotations[I];
307 }
308
getAnnotationCount() const309 unsigned CodeCompletionString::getAnnotationCount() const {
310 return NumAnnotations;
311 }
312
getAnnotation(unsigned AnnotationNr) const313 const char *CodeCompletionString::getAnnotation(unsigned AnnotationNr) const {
314 if (AnnotationNr < NumAnnotations)
315 return reinterpret_cast<const char *const *>(end())[AnnotationNr];
316 else
317 return nullptr;
318 }
319
getAsString() const320 std::string CodeCompletionString::getAsString() const {
321 std::string Result;
322 llvm::raw_string_ostream OS(Result);
323
324 for (const Chunk &C : *this) {
325 switch (C.Kind) {
326 case CK_Optional:
327 OS << "{#" << C.Optional->getAsString() << "#}";
328 break;
329 case CK_Placeholder:
330 OS << "<#" << C.Text << "#>";
331 break;
332 case CK_Informative:
333 case CK_ResultType:
334 OS << "[#" << C.Text << "#]";
335 break;
336 case CK_CurrentParameter:
337 OS << "<#" << C.Text << "#>";
338 break;
339 default:
340 OS << C.Text;
341 break;
342 }
343 }
344 return Result;
345 }
346
getTypedText() const347 const char *CodeCompletionString::getTypedText() const {
348 for (const Chunk &C : *this)
349 if (C.Kind == CK_TypedText)
350 return C.Text;
351
352 return nullptr;
353 }
354
getAllTypedText() const355 std::string CodeCompletionString::getAllTypedText() const {
356 std::string Res;
357 for (const Chunk &C : *this)
358 if (C.Kind == CK_TypedText)
359 Res += C.Text;
360
361 return Res;
362 }
363
CopyString(const Twine & String)364 const char *CodeCompletionAllocator::CopyString(const Twine &String) {
365 SmallString<128> Data;
366 StringRef Ref = String.toStringRef(Data);
367 // FIXME: It would be more efficient to teach Twine to tell us its size and
368 // then add a routine there to fill in an allocated char* with the contents
369 // of the string.
370 char *Mem = (char *)Allocate(Ref.size() + 1, 1);
371 std::copy(Ref.begin(), Ref.end(), Mem);
372 Mem[Ref.size()] = 0;
373 return Mem;
374 }
375
getParentName(const DeclContext * DC)376 StringRef CodeCompletionTUInfo::getParentName(const DeclContext *DC) {
377 if (!isa<NamedDecl>(DC))
378 return {};
379
380 // Check whether we've already cached the parent name.
381 StringRef &CachedParentName = ParentNames[DC];
382 if (!CachedParentName.empty())
383 return CachedParentName;
384
385 // If we already processed this DeclContext and assigned empty to it, the
386 // data pointer will be non-null.
387 if (CachedParentName.data() != nullptr)
388 return {};
389
390 // Find the interesting names.
391 SmallVector<const DeclContext *, 2> Contexts;
392 while (DC && !DC->isFunctionOrMethod()) {
393 if (const auto *ND = dyn_cast<NamedDecl>(DC)) {
394 if (ND->getIdentifier())
395 Contexts.push_back(DC);
396 }
397
398 DC = DC->getParent();
399 }
400
401 {
402 SmallString<128> S;
403 llvm::raw_svector_ostream OS(S);
404 bool First = true;
405 for (const DeclContext *CurDC : llvm::reverse(Contexts)) {
406 if (First)
407 First = false;
408 else {
409 OS << "::";
410 }
411
412 if (const auto *CatImpl = dyn_cast<ObjCCategoryImplDecl>(CurDC))
413 CurDC = CatImpl->getCategoryDecl();
414
415 if (const auto *Cat = dyn_cast<ObjCCategoryDecl>(CurDC)) {
416 const ObjCInterfaceDecl *Interface = Cat->getClassInterface();
417 if (!Interface) {
418 // Assign an empty StringRef but with non-null data to distinguish
419 // between empty because we didn't process the DeclContext yet.
420 CachedParentName = StringRef((const char *)(uintptr_t)~0U, 0);
421 return {};
422 }
423
424 OS << Interface->getName() << '(' << Cat->getName() << ')';
425 } else {
426 OS << cast<NamedDecl>(CurDC)->getName();
427 }
428 }
429
430 CachedParentName = AllocatorRef->CopyString(OS.str());
431 }
432
433 return CachedParentName;
434 }
435
TakeString()436 CodeCompletionString *CodeCompletionBuilder::TakeString() {
437 void *Mem = getAllocator().Allocate(
438 sizeof(CodeCompletionString) + sizeof(Chunk) * Chunks.size() +
439 sizeof(const char *) * Annotations.size(),
440 alignof(CodeCompletionString));
441 CodeCompletionString *Result = new (Mem) CodeCompletionString(
442 Chunks.data(), Chunks.size(), Priority, Availability, Annotations.data(),
443 Annotations.size(), ParentName, BriefComment);
444 Chunks.clear();
445 return Result;
446 }
447
AddTypedTextChunk(const char * Text)448 void CodeCompletionBuilder::AddTypedTextChunk(const char *Text) {
449 Chunks.push_back(Chunk(CodeCompletionString::CK_TypedText, Text));
450 }
451
AddTextChunk(const char * Text)452 void CodeCompletionBuilder::AddTextChunk(const char *Text) {
453 Chunks.push_back(Chunk::CreateText(Text));
454 }
455
AddOptionalChunk(CodeCompletionString * Optional)456 void CodeCompletionBuilder::AddOptionalChunk(CodeCompletionString *Optional) {
457 Chunks.push_back(Chunk::CreateOptional(Optional));
458 }
459
AddPlaceholderChunk(const char * Placeholder)460 void CodeCompletionBuilder::AddPlaceholderChunk(const char *Placeholder) {
461 Chunks.push_back(Chunk::CreatePlaceholder(Placeholder));
462 }
463
AddInformativeChunk(const char * Text)464 void CodeCompletionBuilder::AddInformativeChunk(const char *Text) {
465 Chunks.push_back(Chunk::CreateInformative(Text));
466 }
467
AddResultTypeChunk(const char * ResultType)468 void CodeCompletionBuilder::AddResultTypeChunk(const char *ResultType) {
469 Chunks.push_back(Chunk::CreateResultType(ResultType));
470 }
471
AddCurrentParameterChunk(const char * CurrentParameter)472 void CodeCompletionBuilder::AddCurrentParameterChunk(
473 const char *CurrentParameter) {
474 Chunks.push_back(Chunk::CreateCurrentParameter(CurrentParameter));
475 }
476
AddChunk(CodeCompletionString::ChunkKind CK,const char * Text)477 void CodeCompletionBuilder::AddChunk(CodeCompletionString::ChunkKind CK,
478 const char *Text) {
479 Chunks.push_back(Chunk(CK, Text));
480 }
481
addParentContext(const DeclContext * DC)482 void CodeCompletionBuilder::addParentContext(const DeclContext *DC) {
483 if (DC->isTranslationUnit())
484 return;
485
486 if (DC->isFunctionOrMethod())
487 return;
488
489 if (!isa<NamedDecl>(DC))
490 return;
491
492 ParentName = getCodeCompletionTUInfo().getParentName(DC);
493 }
494
addBriefComment(StringRef Comment)495 void CodeCompletionBuilder::addBriefComment(StringRef Comment) {
496 BriefComment = Allocator.CopyString(Comment);
497 }
498
499 //===----------------------------------------------------------------------===//
500 // Code completion overload candidate implementation
501 //===----------------------------------------------------------------------===//
getFunction() const502 FunctionDecl *CodeCompleteConsumer::OverloadCandidate::getFunction() const {
503 if (getKind() == CK_Function)
504 return Function;
505 else if (getKind() == CK_FunctionTemplate)
506 return FunctionTemplate->getTemplatedDecl();
507 else
508 return nullptr;
509 }
510
511 const FunctionType *
getFunctionType() const512 CodeCompleteConsumer::OverloadCandidate::getFunctionType() const {
513 switch (Kind) {
514 case CK_Function:
515 return Function->getType()->getAs<FunctionType>();
516
517 case CK_FunctionTemplate:
518 return FunctionTemplate->getTemplatedDecl()
519 ->getType()
520 ->getAs<FunctionType>();
521
522 case CK_FunctionType:
523 return Type;
524 case CK_FunctionProtoTypeLoc:
525 return ProtoTypeLoc.getTypePtr();
526 case CK_Template:
527 case CK_Aggregate:
528 return nullptr;
529 }
530
531 llvm_unreachable("Invalid CandidateKind!");
532 }
533
534 const FunctionProtoTypeLoc
getFunctionProtoTypeLoc() const535 CodeCompleteConsumer::OverloadCandidate::getFunctionProtoTypeLoc() const {
536 if (Kind == CK_FunctionProtoTypeLoc)
537 return ProtoTypeLoc;
538 return FunctionProtoTypeLoc();
539 }
540
getNumParams() const541 unsigned CodeCompleteConsumer::OverloadCandidate::getNumParams() const {
542 if (Kind == CK_Template)
543 return Template->getTemplateParameters()->size();
544
545 if (Kind == CK_Aggregate) {
546 unsigned Count =
547 std::distance(AggregateType->field_begin(), AggregateType->field_end());
548 if (const auto *CRD = dyn_cast<CXXRecordDecl>(AggregateType))
549 Count += CRD->getNumBases();
550 return Count;
551 }
552
553 if (const auto *FT = getFunctionType())
554 if (const auto *FPT = dyn_cast<FunctionProtoType>(FT))
555 return FPT->getNumParams();
556
557 return 0;
558 }
559
560 QualType
getParamType(unsigned N) const561 CodeCompleteConsumer::OverloadCandidate::getParamType(unsigned N) const {
562 if (Kind == CK_Aggregate) {
563 if (const auto *CRD = dyn_cast<CXXRecordDecl>(AggregateType)) {
564 if (N < CRD->getNumBases())
565 return std::next(CRD->bases_begin(), N)->getType();
566 N -= CRD->getNumBases();
567 }
568 for (const auto *Field : AggregateType->fields())
569 if (N-- == 0)
570 return Field->getType();
571 return QualType();
572 }
573
574 if (Kind == CK_Template) {
575 TemplateParameterList *TPL = getTemplate()->getTemplateParameters();
576 if (N < TPL->size())
577 if (const auto *D = dyn_cast<NonTypeTemplateParmDecl>(TPL->getParam(N)))
578 return D->getType();
579 return QualType();
580 }
581
582 if (const auto *FT = getFunctionType())
583 if (const auto *FPT = dyn_cast<FunctionProtoType>(FT))
584 if (N < FPT->getNumParams())
585 return FPT->getParamType(N);
586 return QualType();
587 }
588
589 const NamedDecl *
getParamDecl(unsigned N) const590 CodeCompleteConsumer::OverloadCandidate::getParamDecl(unsigned N) const {
591 if (Kind == CK_Aggregate) {
592 if (const auto *CRD = dyn_cast<CXXRecordDecl>(AggregateType)) {
593 if (N < CRD->getNumBases())
594 return std::next(CRD->bases_begin(), N)->getType()->getAsTagDecl();
595 N -= CRD->getNumBases();
596 }
597 for (const auto *Field : AggregateType->fields())
598 if (N-- == 0)
599 return Field;
600 return nullptr;
601 }
602
603 if (Kind == CK_Template) {
604 TemplateParameterList *TPL = getTemplate()->getTemplateParameters();
605 if (N < TPL->size())
606 return TPL->getParam(N);
607 return nullptr;
608 }
609
610 // Note that if we only have a FunctionProtoType, we don't have param decls.
611 if (const auto *FD = getFunction()) {
612 if (N < FD->param_size())
613 return FD->getParamDecl(N);
614 } else if (Kind == CK_FunctionProtoTypeLoc) {
615 if (N < ProtoTypeLoc.getNumParams()) {
616 return ProtoTypeLoc.getParam(N);
617 }
618 }
619
620 return nullptr;
621 }
622
623 //===----------------------------------------------------------------------===//
624 // Code completion consumer implementation
625 //===----------------------------------------------------------------------===//
626
627 CodeCompleteConsumer::~CodeCompleteConsumer() = default;
628
isResultFilteredOut(StringRef Filter,CodeCompletionResult Result)629 bool PrintingCodeCompleteConsumer::isResultFilteredOut(
630 StringRef Filter, CodeCompletionResult Result) {
631 switch (Result.Kind) {
632 case CodeCompletionResult::RK_Declaration:
633 return !(
634 Result.Declaration->getIdentifier() &&
635 Result.Declaration->getIdentifier()->getName().starts_with(Filter));
636 case CodeCompletionResult::RK_Keyword:
637 return !StringRef(Result.Keyword).starts_with(Filter);
638 case CodeCompletionResult::RK_Macro:
639 return !Result.Macro->getName().starts_with(Filter);
640 case CodeCompletionResult::RK_Pattern:
641 return !(Result.Pattern->getTypedText() &&
642 StringRef(Result.Pattern->getTypedText()).starts_with(Filter));
643 }
644 llvm_unreachable("Unknown code completion result Kind.");
645 }
646
ProcessCodeCompleteResults(Sema & SemaRef,CodeCompletionContext Context,CodeCompletionResult * Results,unsigned NumResults)647 void PrintingCodeCompleteConsumer::ProcessCodeCompleteResults(
648 Sema &SemaRef, CodeCompletionContext Context, CodeCompletionResult *Results,
649 unsigned NumResults) {
650 std::stable_sort(Results, Results + NumResults);
651
652 if (!Context.getPreferredType().isNull())
653 OS << "PREFERRED-TYPE: " << Context.getPreferredType() << '\n';
654
655 StringRef Filter = SemaRef.getPreprocessor().getCodeCompletionFilter();
656 // Print the completions.
657 for (unsigned I = 0; I != NumResults; ++I) {
658 if (!Filter.empty() && isResultFilteredOut(Filter, Results[I]))
659 continue;
660 OS << "COMPLETION: ";
661 switch (Results[I].Kind) {
662 case CodeCompletionResult::RK_Declaration:
663 OS << *Results[I].Declaration;
664 {
665 std::vector<std::string> Tags;
666 if (Results[I].Hidden)
667 Tags.push_back("Hidden");
668 if (Results[I].InBaseClass)
669 Tags.push_back("InBase");
670 if (Results[I].Availability ==
671 CXAvailabilityKind::CXAvailability_NotAccessible)
672 Tags.push_back("Inaccessible");
673 if (!Tags.empty())
674 OS << " (" << llvm::join(Tags, ",") << ")";
675 }
676 if (CodeCompletionString *CCS = Results[I].CreateCodeCompletionString(
677 SemaRef, Context, getAllocator(), CCTUInfo,
678 includeBriefComments())) {
679 OS << " : " << CCS->getAsString();
680 if (const char *BriefComment = CCS->getBriefComment())
681 OS << " : " << BriefComment;
682 }
683 break;
684
685 case CodeCompletionResult::RK_Keyword:
686 OS << Results[I].Keyword;
687 break;
688
689 case CodeCompletionResult::RK_Macro:
690 OS << Results[I].Macro->getName();
691 if (CodeCompletionString *CCS = Results[I].CreateCodeCompletionString(
692 SemaRef, Context, getAllocator(), CCTUInfo,
693 includeBriefComments())) {
694 OS << " : " << CCS->getAsString();
695 }
696 break;
697
698 case CodeCompletionResult::RK_Pattern:
699 OS << "Pattern : " << Results[I].Pattern->getAsString();
700 break;
701 }
702 for (const FixItHint &FixIt : Results[I].FixIts) {
703 const SourceLocation BLoc = FixIt.RemoveRange.getBegin();
704 const SourceLocation ELoc = FixIt.RemoveRange.getEnd();
705
706 SourceManager &SM = SemaRef.SourceMgr;
707 std::pair<FileID, unsigned> BInfo = SM.getDecomposedLoc(BLoc);
708 std::pair<FileID, unsigned> EInfo = SM.getDecomposedLoc(ELoc);
709 // Adjust for token ranges.
710 if (FixIt.RemoveRange.isTokenRange())
711 EInfo.second += Lexer::MeasureTokenLength(ELoc, SM, SemaRef.LangOpts);
712
713 OS << " (requires fix-it:"
714 << " {" << SM.getLineNumber(BInfo.first, BInfo.second) << ':'
715 << SM.getColumnNumber(BInfo.first, BInfo.second) << '-'
716 << SM.getLineNumber(EInfo.first, EInfo.second) << ':'
717 << SM.getColumnNumber(EInfo.first, EInfo.second) << "}"
718 << " to \"" << FixIt.CodeToInsert << "\")";
719 }
720 OS << '\n';
721 }
722 }
723
724 // This function is used solely to preserve the former presentation of overloads
725 // by "clang -cc1 -code-completion-at", since CodeCompletionString::getAsString
726 // needs to be improved for printing the newer and more detailed overload
727 // chunks.
getOverloadAsString(const CodeCompletionString & CCS)728 static std::string getOverloadAsString(const CodeCompletionString &CCS) {
729 std::string Result;
730 llvm::raw_string_ostream OS(Result);
731
732 for (auto &C : CCS) {
733 switch (C.Kind) {
734 case CodeCompletionString::CK_Informative:
735 case CodeCompletionString::CK_ResultType:
736 OS << "[#" << C.Text << "#]";
737 break;
738
739 case CodeCompletionString::CK_CurrentParameter:
740 OS << "<#" << C.Text << "#>";
741 break;
742
743 // FIXME: We can also print optional parameters of an overload.
744 case CodeCompletionString::CK_Optional:
745 break;
746
747 default:
748 OS << C.Text;
749 break;
750 }
751 }
752 return Result;
753 }
754
ProcessOverloadCandidates(Sema & SemaRef,unsigned CurrentArg,OverloadCandidate * Candidates,unsigned NumCandidates,SourceLocation OpenParLoc,bool Braced)755 void PrintingCodeCompleteConsumer::ProcessOverloadCandidates(
756 Sema &SemaRef, unsigned CurrentArg, OverloadCandidate *Candidates,
757 unsigned NumCandidates, SourceLocation OpenParLoc, bool Braced) {
758 OS << "OPENING_PAREN_LOC: ";
759 OpenParLoc.print(OS, SemaRef.getSourceManager());
760 OS << "\n";
761
762 for (unsigned I = 0; I != NumCandidates; ++I) {
763 if (CodeCompletionString *CCS = Candidates[I].CreateSignatureString(
764 CurrentArg, SemaRef, getAllocator(), CCTUInfo,
765 includeBriefComments(), Braced)) {
766 OS << "OVERLOAD: " << getOverloadAsString(*CCS) << "\n";
767 }
768 }
769 }
770
771 /// Retrieve the effective availability of the given declaration.
getDeclAvailability(const Decl * D)772 static AvailabilityResult getDeclAvailability(const Decl *D) {
773 AvailabilityResult AR = D->getAvailability();
774 if (isa<EnumConstantDecl>(D))
775 AR = std::max(AR, cast<Decl>(D->getDeclContext())->getAvailability());
776 return AR;
777 }
778
computeCursorKindAndAvailability(bool Accessible)779 void CodeCompletionResult::computeCursorKindAndAvailability(bool Accessible) {
780 switch (Kind) {
781 case RK_Pattern:
782 if (!Declaration) {
783 // Do nothing: Patterns can come with cursor kinds!
784 break;
785 }
786 [[fallthrough]];
787
788 case RK_Declaration: {
789 // Set the availability based on attributes.
790 switch (getDeclAvailability(Declaration)) {
791 case AR_Available:
792 case AR_NotYetIntroduced:
793 Availability = CXAvailability_Available;
794 break;
795
796 case AR_Deprecated:
797 Availability = CXAvailability_Deprecated;
798 break;
799
800 case AR_Unavailable:
801 Availability = CXAvailability_NotAvailable;
802 break;
803 }
804
805 if (const auto *Function = dyn_cast<FunctionDecl>(Declaration))
806 if (Function->isDeleted())
807 Availability = CXAvailability_NotAvailable;
808
809 CursorKind = getCursorKindForDecl(Declaration);
810 if (CursorKind == CXCursor_UnexposedDecl) {
811 // FIXME: Forward declarations of Objective-C classes and protocols
812 // are not directly exposed, but we want code completion to treat them
813 // like a definition.
814 if (isa<ObjCInterfaceDecl>(Declaration))
815 CursorKind = CXCursor_ObjCInterfaceDecl;
816 else if (isa<ObjCProtocolDecl>(Declaration))
817 CursorKind = CXCursor_ObjCProtocolDecl;
818 else
819 CursorKind = CXCursor_NotImplemented;
820 }
821 break;
822 }
823
824 case RK_Macro:
825 case RK_Keyword:
826 llvm_unreachable("Macro and keyword kinds are handled by the constructors");
827 }
828
829 if (!Accessible)
830 Availability = CXAvailability_NotAccessible;
831 }
832
833 /// Retrieve the name that should be used to order a result.
834 ///
835 /// If the name needs to be constructed as a string, that string will be
836 /// saved into Saved and the returned StringRef will refer to it.
getOrderedName(std::string & Saved) const837 StringRef CodeCompletionResult::getOrderedName(std::string &Saved) const {
838 switch (Kind) {
839 case RK_Keyword:
840 return Keyword;
841 case RK_Pattern:
842 return Pattern->getTypedText();
843 case RK_Macro:
844 return Macro->getName();
845 case RK_Declaration:
846 // Handle declarations below.
847 break;
848 }
849
850 DeclarationName Name = Declaration->getDeclName();
851
852 // If the name is a simple identifier (by far the common case), or a
853 // zero-argument selector, just return a reference to that identifier.
854 if (IdentifierInfo *Id = Name.getAsIdentifierInfo())
855 return Id->getName();
856 if (Name.isObjCZeroArgSelector())
857 if (IdentifierInfo *Id = Name.getObjCSelector().getIdentifierInfoForSlot(0))
858 return Id->getName();
859
860 Saved = Name.getAsString();
861 return Saved;
862 }
863
operator <(const CodeCompletionResult & X,const CodeCompletionResult & Y)864 bool clang::operator<(const CodeCompletionResult &X,
865 const CodeCompletionResult &Y) {
866 std::string XSaved, YSaved;
867 StringRef XStr = X.getOrderedName(XSaved);
868 StringRef YStr = Y.getOrderedName(YSaved);
869 int cmp = XStr.compare_insensitive(YStr);
870 if (cmp)
871 return cmp < 0;
872
873 // If case-insensitive comparison fails, try case-sensitive comparison.
874 return XStr.compare(YStr) < 0;
875 }
876