lib/Sema/CodeCompleteConsumer.cpp - platform/external/clang - Gitiles

 //===--- CodeCompleteConsumer.cpp - Code Completion Interface ---*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 //  This file implements the CodeCompleteConsumer class.
 //
 //===----------------------------------------------------------------------===//
 #include "clang/Sema/CodeCompleteConsumer.h"
 #include "clang/Sema/Scope.h"
 #include "clang/Sema/Sema.h"
 #include "clang/AST/DeclCXX.h"
 #include "clang/AST/DeclObjC.h"
 #include "clang/AST/DeclTemplate.h"
 #include "clang/Lex/Preprocessor.h"
 #include "clang-c/Index.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/Support/raw_ostream.h"
 #include <algorithm>
 #include <cstring>
 #include <functional>

 using namespace clang;
 using llvm::StringRef;

 //===----------------------------------------------------------------------===//
 // Code completion context implementation
 //===----------------------------------------------------------------------===//

 bool CodeCompletionContext::wantConstructorResults() const {
   switch (Kind) {
   case CCC_Recovery:
   case CCC_Statement:
   case CCC_Expression:
   case CCC_ObjCMessageReceiver:
   case CCC_ParenthesizedExpression:
     return true;

   case CCC_TopLevel:
   case CCC_ObjCInterface:
   case CCC_ObjCImplementation:
   case CCC_ObjCIvarList:
   case CCC_ClassStructUnion:
   case CCC_MemberAccess:
   case CCC_EnumTag:
   case CCC_UnionTag:
   case CCC_ClassOrStructTag:
   case CCC_ObjCProtocolName:
   case CCC_Namespace:
   case CCC_Type:
   case CCC_Name:
   case CCC_PotentiallyQualifiedName:
   case CCC_MacroName:
   case CCC_MacroNameUse:
   case CCC_PreprocessorExpression:
   case CCC_PreprocessorDirective:
   case CCC_NaturalLanguage:
   case CCC_SelectorName:
   case CCC_TypeQualifiers:
   case CCC_Other:
   case CCC_OtherWithMacros:
     return false;
   }

   return false;
 }

 //===----------------------------------------------------------------------===//
 // Code completion string implementation
 //===----------------------------------------------------------------------===//
 CodeCompletionString::Chunk::Chunk(ChunkKind Kind, const char *Text)
   : Kind(Kind), Text("")
 {
   switch (Kind) {
   case CK_TypedText:
   case CK_Text:
   case CK_Placeholder:
   case CK_Informative:
   case CK_ResultType:
   case CK_CurrentParameter:
     this->Text = Text;
     break;

   case CK_Optional:
     llvm_unreachable("Optional strings cannot be created from text");
     break;

   case CK_LeftParen:
     this->Text = "(";
     break;

   case CK_RightParen:
     this->Text = ")";
     break;

   case CK_LeftBracket:
     this->Text = "[";
     break;

   case CK_RightBracket:
     this->Text = "]";
     break;

   case CK_LeftBrace:
     this->Text = "{";
     break;

   case CK_RightBrace:
     this->Text = "}";
     break;

   case CK_LeftAngle:
     this->Text = "<";
     break;

   case CK_RightAngle:
     this->Text = ">";
     break;

   case CK_Comma:
     this->Text = ", ";
     break;

   case CK_Colon:
     this->Text = ":";
     break;

   case CK_SemiColon:
     this->Text = ";";
     break;

   case CK_Equal:
     this->Text = " = ";
     break;

   case CK_HorizontalSpace:
     this->Text = " ";
     break;

   case CK_VerticalSpace:
     this->Text = "\n";
     break;
   }
 }

 CodeCompletionString::Chunk
 CodeCompletionString::Chunk::CreateText(const char *Text) {
   return Chunk(CK_Text, Text);
 }

 CodeCompletionString::Chunk
 CodeCompletionString::Chunk::CreateOptional(CodeCompletionString *Optional) {
   Chunk Result;
   Result.Kind = CK_Optional;
   Result.Optional = Optional;
   return Result;
 }

 CodeCompletionString::Chunk
 CodeCompletionString::Chunk::CreatePlaceholder(const char *Placeholder) {
   return Chunk(CK_Placeholder, Placeholder);
 }

 CodeCompletionString::Chunk
 CodeCompletionString::Chunk::CreateInformative(const char *Informative) {
   return Chunk(CK_Informative, Informative);
 }

 CodeCompletionString::Chunk
 CodeCompletionString::Chunk::CreateResultType(const char *ResultType) {
   return Chunk(CK_ResultType, ResultType);
 }

 CodeCompletionString::Chunk
 CodeCompletionString::Chunk::CreateCurrentParameter(
                                                 const char *CurrentParameter) {
   return Chunk(CK_CurrentParameter, CurrentParameter);
 }

 CodeCompletionString::CodeCompletionString(const Chunk *Chunks,
                                            unsigned NumChunks,
                                            unsigned Priority,
                                            CXAvailabilityKind Availability)
   : NumChunks(NumChunks), Priority(Priority), Availability(Availability)
 {
   Chunk *StoredChunks = reinterpret_cast<Chunk *>(this + 1);
   for (unsigned I = 0; I != NumChunks; ++I)
     StoredChunks[I] = Chunks[I];
 }

 std::string CodeCompletionString::getAsString() const {
   std::string Result;
   llvm::raw_string_ostream OS(Result);

   for (iterator C = begin(), CEnd = end(); C != CEnd; ++C) {
     switch (C->Kind) {
     case CK_Optional: OS << "{#" << C->Optional->getAsString() << "#}"; break;
     case CK_Placeholder: OS << "<#" << C->Text << "#>"; break;

     case CK_Informative:
     case CK_ResultType:
       OS << "[#" << C->Text << "#]";
       break;

     case CK_CurrentParameter: OS << "<#" << C->Text << "#>"; break;
     default: OS << C->Text; break;
     }
   }
   return OS.str();
 }

 const char *CodeCompletionString::getTypedText() const {
   for (iterator C = begin(), CEnd = end(); C != CEnd; ++C)
     if (C->Kind == CK_TypedText)
       return C->Text;

   return 0;
 }

 const char *CodeCompletionAllocator::CopyString(llvm::StringRef String) {
   char *Mem = (char *)Allocate(String.size() + 1, 1);
   std::copy(String.begin(), String.end(), Mem);
   Mem[String.size()] = 0;
   return Mem;
 }

 const char *CodeCompletionAllocator::CopyString(llvm::Twine String) {
   // FIXME: It would be more efficient to teach Twine to tell us its size and
   // then add a routine there to fill in an allocated char* with the contents
   // of the string.
   llvm::SmallString<128> Data;
   return CopyString(String.toStringRef(Data));
 }

 CodeCompletionString *CodeCompletionBuilder::TakeString() {
   void *Mem = Allocator.Allocate(
                   sizeof(CodeCompletionString) + sizeof(Chunk) * Chunks.size(),
                                  llvm::alignOf<CodeCompletionString>());
   CodeCompletionString *Result
     = new (Mem) CodeCompletionString(Chunks.data(), Chunks.size(),
                                Priority, Availability);
   Chunks.clear();
   return Result;
 }

 unsigned CodeCompletionResult::getPriorityFromDecl(NamedDecl *ND) {
   if (!ND)
     return CCP_Unlikely;

   // Context-based decisions.
   DeclContext *DC = ND->getDeclContext()->getRedeclContext();
   if (DC->isFunctionOrMethod() || isa<BlockDecl>(DC)) {
     // _cmd is relatively rare
     if (ImplicitParamDecl *ImplicitParam = dyn_cast<ImplicitParamDecl>(ND))
       if (ImplicitParam->getIdentifier() &&
           ImplicitParam->getIdentifier()->isStr("_cmd"))
         return CCP_ObjC_cmd;

     return CCP_LocalDeclaration;
   }
   if (DC->isRecord() || isa<ObjCContainerDecl>(DC))
     return CCP_MemberDeclaration;

   // Content-based decisions.
   if (isa<EnumConstantDecl>(ND))
     return CCP_Constant;
   if (isa<TypeDecl>(ND) || isa<ObjCInterfaceDecl>(ND))
     return CCP_Type;

   return CCP_Declaration;
 }

 //===----------------------------------------------------------------------===//
 // Code completion overload candidate implementation
 //===----------------------------------------------------------------------===//
 FunctionDecl *
 CodeCompleteConsumer::OverloadCandidate::getFunction() const {
   if (getKind() == CK_Function)
     return Function;
   else if (getKind() == CK_FunctionTemplate)
     return FunctionTemplate->getTemplatedDecl();
   else
     return 0;
 }

 const FunctionType *
 CodeCompleteConsumer::OverloadCandidate::getFunctionType() const {
   switch (Kind) {
   case CK_Function:
     return Function->getType()->getAs<FunctionType>();

   case CK_FunctionTemplate:
     return FunctionTemplate->getTemplatedDecl()->getType()
              ->getAs<FunctionType>();

   case CK_FunctionType:
     return Type;
   }

   return 0;
 }

 //===----------------------------------------------------------------------===//
 // Code completion consumer implementation
 //===----------------------------------------------------------------------===//

 CodeCompleteConsumer::~CodeCompleteConsumer() { }

 void
 PrintingCodeCompleteConsumer::ProcessCodeCompleteResults(Sema &SemaRef,
                                                  CodeCompletionContext Context,
                                                  CodeCompletionResult *Results,
                                                          unsigned NumResults) {
   std::stable_sort(Results, Results + NumResults);

   // Print the results.
   for (unsigned I = 0; I != NumResults; ++I) {
     OS << "COMPLETION: ";
     switch (Results[I].Kind) {
     case CodeCompletionResult::RK_Declaration:
       OS << Results[I].Declaration;
       if (Results[I].Hidden)
         OS << " (Hidden)";
       if (CodeCompletionString *CCS
             = Results[I].CreateCodeCompletionString(SemaRef, Allocator)) {
         OS << " : " << CCS->getAsString();
       }

       OS << '\n';
       break;

     case CodeCompletionResult::RK_Keyword:
       OS << Results[I].Keyword << '\n';
       break;

     case CodeCompletionResult::RK_Macro: {
       OS << Results[I].Macro->getName();
       if (CodeCompletionString *CCS
             = Results[I].CreateCodeCompletionString(SemaRef, Allocator)) {
         OS << " : " << CCS->getAsString();
       }
       OS << '\n';
       break;
     }

     case CodeCompletionResult::RK_Pattern: {
       OS << "Pattern : "
          << Results[I].Pattern->getAsString() << '\n';
       break;
     }
     }
   }
 }

 void
 PrintingCodeCompleteConsumer::ProcessOverloadCandidates(Sema &SemaRef,
                                                         unsigned CurrentArg,
                                               OverloadCandidate *Candidates,
                                                      unsigned NumCandidates) {
   for (unsigned I = 0; I != NumCandidates; ++I) {
     if (CodeCompletionString *CCS
           = Candidates[I].CreateSignatureString(CurrentArg, SemaRef,
                                                 Allocator)) {
       OS << "OVERLOAD: " << CCS->getAsString() << "\n";
     }
   }
 }

 void CodeCompletionResult::computeCursorKindAndAvailability() {
   switch (Kind) {
   case RK_Declaration:
     // Set the availability based on attributes.
     Availability = CXAvailability_Available;
     if (Declaration->getAttr<UnavailableAttr>())
       Availability = CXAvailability_NotAvailable;
     else if (Declaration->getAttr<DeprecatedAttr>())
       Availability = CXAvailability_Deprecated;

     if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Declaration))
       if (Function->isDeleted())
         Availability = CXAvailability_NotAvailable;

     CursorKind = getCursorKindForDecl(Declaration);
     if (CursorKind == CXCursor_UnexposedDecl)
       CursorKind = CXCursor_NotImplemented;
     break;

   case RK_Macro:
     Availability = CXAvailability_Available;
     CursorKind = CXCursor_MacroDefinition;
     break;

   case RK_Keyword:
     Availability = CXAvailability_Available;
     CursorKind = CXCursor_NotImplemented;
     break;

   case RK_Pattern:
     // Do nothing: Patterns can come with cursor kinds!
     break;
   }
 }

 /// \brief Retrieve the name that should be used to order a result.
 ///
 /// If the name needs to be constructed as a string, that string will be
 /// saved into Saved and the returned StringRef will refer to it.
 static llvm::StringRef getOrderedName(const CodeCompletionResult &R,
                                     std::string &Saved) {
   switch (R.Kind) {
     case CodeCompletionResult::RK_Keyword:
       return R.Keyword;

     case CodeCompletionResult::RK_Pattern:
       return R.Pattern->getTypedText();

     case CodeCompletionResult::RK_Macro:
       return R.Macro->getName();

     case CodeCompletionResult::RK_Declaration:
       // Handle declarations below.
       break;
   }

   DeclarationName Name = R.Declaration->getDeclName();

   // If the name is a simple identifier (by far the common case), or a
   // zero-argument selector, just return a reference to that identifier.
   if (IdentifierInfo *Id = Name.getAsIdentifierInfo())
     return Id->getName();
   if (Name.isObjCZeroArgSelector())
     if (IdentifierInfo *Id
         = Name.getObjCSelector().getIdentifierInfoForSlot(0))
       return Id->getName();

   Saved = Name.getAsString();
   return Saved;
 }

 bool clang::operator<(const CodeCompletionResult &X,
                       const CodeCompletionResult &Y) {
   std::string XSaved, YSaved;
   llvm::StringRef XStr = getOrderedName(X, XSaved);
   llvm::StringRef YStr = getOrderedName(Y, YSaved);
   int cmp = XStr.compare_lower(YStr);
   if (cmp)
     return cmp < 0;

   // If case-insensitive comparison fails, try case-sensitive comparison.
   cmp = XStr.compare(YStr);
   if (cmp)
     return cmp < 0;

   return false;
 }
	//===--- CodeCompleteConsumer.cpp - Code Completion Interface ---- C++ --===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file is distributed under the University of Illinois Open Source
	// License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//
	//
	// This file implements the CodeCompleteConsumer class.
	//
	//===----------------------------------------------------------------------===//
	#include "clang/Sema/CodeCompleteConsumer.h"
	#include "clang/Sema/Scope.h"
	#include "clang/Sema/Sema.h"
	#include "clang/AST/DeclCXX.h"
	#include "clang/AST/DeclObjC.h"
	#include "clang/AST/DeclTemplate.h"
	#include "clang/Lex/Preprocessor.h"
	#include "clang-c/Index.h"
	#include "llvm/ADT/STLExtras.h"
	#include "llvm/ADT/Twine.h"
	#include "llvm/Support/raw_ostream.h"
	#include <algorithm>
	#include <cstring>
	#include <functional>

	using namespace clang;
	using llvm::StringRef;

	//===----------------------------------------------------------------------===//
	// Code completion context implementation
	//===----------------------------------------------------------------------===//

	bool CodeCompletionContext::wantConstructorResults() const {
	switch (Kind) {
	case CCC_Recovery:
	case CCC_Statement:
	case CCC_Expression:
	case CCC_ObjCMessageReceiver:
	case CCC_ParenthesizedExpression:
	return true;

	case CCC_TopLevel:
	case CCC_ObjCInterface:
	case CCC_ObjCImplementation:
	case CCC_ObjCIvarList:
	case CCC_ClassStructUnion:
	case CCC_MemberAccess:
	case CCC_EnumTag:
	case CCC_UnionTag:
	case CCC_ClassOrStructTag:
	case CCC_ObjCProtocolName:
	case CCC_Namespace:
	case CCC_Type:
	case CCC_Name:
	case CCC_PotentiallyQualifiedName:
	case CCC_MacroName:
	case CCC_MacroNameUse:
	case CCC_PreprocessorExpression:
	case CCC_PreprocessorDirective:
	case CCC_NaturalLanguage:
	case CCC_SelectorName:
	case CCC_TypeQualifiers:
	case CCC_Other:
	case CCC_OtherWithMacros:
	return false;
	}

	return false;
	}

	//===----------------------------------------------------------------------===//
	// Code completion string implementation
	//===----------------------------------------------------------------------===//
	CodeCompletionString::Chunk::Chunk(ChunkKind Kind, const char *Text)
	: Kind(Kind), Text("")
	{
	switch (Kind) {
	case CK_TypedText:
	case CK_Text:
	case CK_Placeholder:
	case CK_Informative:
	case CK_ResultType:
	case CK_CurrentParameter:
	this->Text = Text;
	break;

	case CK_Optional:
	llvm_unreachable("Optional strings cannot be created from text");
	break;

	case CK_LeftParen:
	this->Text = "(";
	break;

	case CK_RightParen:
	this->Text = ")";
	break;

	case CK_LeftBracket:
	this->Text = "[";
	break;

	case CK_RightBracket:
	this->Text = "]";
	break;

	case CK_LeftBrace:
	this->Text = "{";
	break;

	case CK_RightBrace:
	this->Text = "}";
	break;

	case CK_LeftAngle:
	this->Text = "<";
	break;

	case CK_RightAngle:
	this->Text = ">";
	break;

	case CK_Comma:
	this->Text = ", ";
	break;

	case CK_Colon:
	this->Text = ":";
	break;

	case CK_SemiColon:
	this->Text = ";";
	break;

	case CK_Equal:
	this->Text = " = ";
	break;

	case CK_HorizontalSpace:
	this->Text = " ";
	break;

	case CK_VerticalSpace:
	this->Text = "\n";
	break;
	}
	}

	CodeCompletionString::Chunk
	CodeCompletionString::Chunk::CreateText(const char *Text) {
	return Chunk(CK_Text, Text);
	}

	CodeCompletionString::Chunk
	CodeCompletionString::Chunk::CreateOptional(CodeCompletionString *Optional) {
	Chunk Result;
	Result.Kind = CK_Optional;
	Result.Optional = Optional;
	return Result;
	}

	CodeCompletionString::Chunk
	CodeCompletionString::Chunk::CreatePlaceholder(const char *Placeholder) {
	return Chunk(CK_Placeholder, Placeholder);
	}

	CodeCompletionString::Chunk
	CodeCompletionString::Chunk::CreateInformative(const char *Informative) {
	return Chunk(CK_Informative, Informative);
	}

	CodeCompletionString::Chunk
	CodeCompletionString::Chunk::CreateResultType(const char *ResultType) {
	return Chunk(CK_ResultType, ResultType);
	}

	CodeCompletionString::Chunk
	CodeCompletionString::Chunk::CreateCurrentParameter(
	const char *CurrentParameter) {
	return Chunk(CK_CurrentParameter, CurrentParameter);
	}

	CodeCompletionString::CodeCompletionString(const Chunk *Chunks,
	unsigned NumChunks,
	unsigned Priority,
	CXAvailabilityKind Availability)
	: NumChunks(NumChunks), Priority(Priority), Availability(Availability)
	{
	Chunk StoredChunks = reinterpret_cast<Chunk >(this + 1);
	for (unsigned I = 0; I != NumChunks; ++I)
	StoredChunks[I] = Chunks[I];
	}

	std::string CodeCompletionString::getAsString() const {
	std::string Result;
	llvm::raw_string_ostream OS(Result);

	for (iterator C = begin(), CEnd = end(); C != CEnd; ++C) {
	switch (C->Kind) {
	case CK_Optional: OS << "{#" << C->Optional->getAsString() << "#}"; break;
	case CK_Placeholder: OS << "<#" << C->Text << "#>"; break;

	case CK_Informative:
	case CK_ResultType:
	OS << "[#" << C->Text << "#]";
	break;

	case CK_CurrentParameter: OS << "<#" << C->Text << "#>"; break;
	default: OS << C->Text; break;
	}
	}
	return OS.str();
	}

	const char *CodeCompletionString::getTypedText() const {
	for (iterator C = begin(), CEnd = end(); C != CEnd; ++C)
	if (C->Kind == CK_TypedText)
	return C->Text;

	return 0;
	}

	const char *CodeCompletionAllocator::CopyString(llvm::StringRef String) {
	char Mem = (char )Allocate(String.size() + 1, 1);
	std::copy(String.begin(), String.end(), Mem);
	Mem[String.size()] = 0;
	return Mem;
	}

	const char *CodeCompletionAllocator::CopyString(llvm::Twine String) {
	// FIXME: It would be more efficient to teach Twine to tell us its size and
	// then add a routine there to fill in an allocated char* with the contents
	// of the string.
	llvm::SmallString<128> Data;
	return CopyString(String.toStringRef(Data));
	}

	CodeCompletionString *CodeCompletionBuilder::TakeString() {
	void *Mem = Allocator.Allocate(
	sizeof(CodeCompletionString) + sizeof(Chunk) * Chunks.size(),
	llvm::alignOf<CodeCompletionString>());
	CodeCompletionString *Result
	= new (Mem) CodeCompletionString(Chunks.data(), Chunks.size(),
	Priority, Availability);
	Chunks.clear();
	return Result;
	}

	unsigned CodeCompletionResult::getPriorityFromDecl(NamedDecl *ND) {
	if (!ND)
	return CCP_Unlikely;

	// Context-based decisions.
	DeclContext *DC = ND->getDeclContext()->getRedeclContext();
	if (DC->isFunctionOrMethod() \|\| isa<BlockDecl>(DC)) {
	// _cmd is relatively rare
	if (ImplicitParamDecl *ImplicitParam = dyn_cast<ImplicitParamDecl>(ND))
	if (ImplicitParam->getIdentifier() &&
	ImplicitParam->getIdentifier()->isStr("_cmd"))
	return CCP_ObjC_cmd;

	return CCP_LocalDeclaration;
	}
	if (DC->isRecord() \|\| isa<ObjCContainerDecl>(DC))
	return CCP_MemberDeclaration;

	// Content-based decisions.
	if (isa<EnumConstantDecl>(ND))
	return CCP_Constant;
	if (isa<TypeDecl>(ND) \|\| isa<ObjCInterfaceDecl>(ND))
	return CCP_Type;

	return CCP_Declaration;
	}

	//===----------------------------------------------------------------------===//
	// Code completion overload candidate implementation
	//===----------------------------------------------------------------------===//
	FunctionDecl *
	CodeCompleteConsumer::OverloadCandidate::getFunction() const {
	if (getKind() == CK_Function)
	return Function;
	else if (getKind() == CK_FunctionTemplate)
	return FunctionTemplate->getTemplatedDecl();
	else
	return 0;
	}

	const FunctionType *
	CodeCompleteConsumer::OverloadCandidate::getFunctionType() const {
	switch (Kind) {
	case CK_Function:
	return Function->getType()->getAs<FunctionType>();

	case CK_FunctionTemplate:
	return FunctionTemplate->getTemplatedDecl()->getType()
	->getAs<FunctionType>();

	case CK_FunctionType:
	return Type;
	}

	return 0;
	}

	//===----------------------------------------------------------------------===//
	// Code completion consumer implementation
	//===----------------------------------------------------------------------===//

	CodeCompleteConsumer::~CodeCompleteConsumer() { }

	void
	PrintingCodeCompleteConsumer::ProcessCodeCompleteResults(Sema &SemaRef,
	CodeCompletionContext Context,
	CodeCompletionResult *Results,
	unsigned NumResults) {
	std::stable_sort(Results, Results + NumResults);

	// Print the results.
	for (unsigned I = 0; I != NumResults; ++I) {
	OS << "COMPLETION: ";
	switch (Results[I].Kind) {
	case CodeCompletionResult::RK_Declaration:
	OS << Results[I].Declaration;
	if (Results[I].Hidden)
	OS << " (Hidden)";
	if (CodeCompletionString *CCS
	= Results[I].CreateCodeCompletionString(SemaRef, Allocator)) {
	OS << " : " << CCS->getAsString();
	}

	OS << '\n';
	break;

	case CodeCompletionResult::RK_Keyword:
	OS << Results[I].Keyword << '\n';
	break;

	case CodeCompletionResult::RK_Macro: {
	OS << Results[I].Macro->getName();
	if (CodeCompletionString *CCS
	= Results[I].CreateCodeCompletionString(SemaRef, Allocator)) {
	OS << " : " << CCS->getAsString();
	}
	OS << '\n';
	break;
	}

	case CodeCompletionResult::RK_Pattern: {
	OS << "Pattern : "
	<< Results[I].Pattern->getAsString() << '\n';
	break;
	}
	}
	}
	}

	void
	PrintingCodeCompleteConsumer::ProcessOverloadCandidates(Sema &SemaRef,
	unsigned CurrentArg,
	OverloadCandidate *Candidates,
	unsigned NumCandidates) {
	for (unsigned I = 0; I != NumCandidates; ++I) {
	if (CodeCompletionString *CCS
	= Candidates[I].CreateSignatureString(CurrentArg, SemaRef,
	Allocator)) {
	OS << "OVERLOAD: " << CCS->getAsString() << "\n";
	}
	}
	}

	void CodeCompletionResult::computeCursorKindAndAvailability() {
	switch (Kind) {
	case RK_Declaration:
	// Set the availability based on attributes.
	Availability = CXAvailability_Available;
	if (Declaration->getAttr<UnavailableAttr>())
	Availability = CXAvailability_NotAvailable;
	else if (Declaration->getAttr<DeprecatedAttr>())
	Availability = CXAvailability_Deprecated;

	if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Declaration))
	if (Function->isDeleted())
	Availability = CXAvailability_NotAvailable;

	CursorKind = getCursorKindForDecl(Declaration);
	if (CursorKind == CXCursor_UnexposedDecl)
	CursorKind = CXCursor_NotImplemented;
	break;

	case RK_Macro:
	Availability = CXAvailability_Available;
	CursorKind = CXCursor_MacroDefinition;
	break;

	case RK_Keyword:
	Availability = CXAvailability_Available;
	CursorKind = CXCursor_NotImplemented;
	break;

	case RK_Pattern:
	// Do nothing: Patterns can come with cursor kinds!
	break;
	}
	}

	/// \brief Retrieve the name that should be used to order a result.
	///
	/// If the name needs to be constructed as a string, that string will be
	/// saved into Saved and the returned StringRef will refer to it.
	static llvm::StringRef getOrderedName(const CodeCompletionResult &R,
	std::string &Saved) {
	switch (R.Kind) {
	case CodeCompletionResult::RK_Keyword:
	return R.Keyword;

	case CodeCompletionResult::RK_Pattern:
	return R.Pattern->getTypedText();

	case CodeCompletionResult::RK_Macro:
	return R.Macro->getName();

	case CodeCompletionResult::RK_Declaration:
	// Handle declarations below.
	break;
	}

	DeclarationName Name = R.Declaration->getDeclName();

	// If the name is a simple identifier (by far the common case), or a
	// zero-argument selector, just return a reference to that identifier.
	if (IdentifierInfo *Id = Name.getAsIdentifierInfo())
	return Id->getName();
	if (Name.isObjCZeroArgSelector())
	if (IdentifierInfo *Id
	= Name.getObjCSelector().getIdentifierInfoForSlot(0))
	return Id->getName();

	Saved = Name.getAsString();
	return Saved;
	}

	bool clang::operator<(const CodeCompletionResult &X,
	const CodeCompletionResult &Y) {
	std::string XSaved, YSaved;
	llvm::StringRef XStr = getOrderedName(X, XSaved);
	llvm::StringRef YStr = getOrderedName(Y, YSaved);
	int cmp = XStr.compare_lower(YStr);
	if (cmp)
	return cmp < 0;

	// If case-insensitive comparison fails, try case-sensitive comparison.
	cmp = XStr.compare(YStr);
	if (cmp)
	return cmp < 0;

	return false;
	}