unittests/Tooling/RecursiveASTVisitorTest.cpp - fp2-dev/platform/external/clang - Gitiles

 //===- unittest/Tooling/RecursiveASTVisitorTest.cpp -----------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//

 #include "TestVisitor.h"

 #include <stack>

 namespace clang {

 class TypeLocVisitor : public ExpectedLocationVisitor<TypeLocVisitor> {
 public:
   bool VisitTypeLoc(TypeLoc TypeLocation) {
     Match(TypeLocation.getType().getAsString(), TypeLocation.getBeginLoc());
     return true;
   }
 };

 class DeclRefExprVisitor : public ExpectedLocationVisitor<DeclRefExprVisitor> {
 public:
   bool VisitDeclRefExpr(DeclRefExpr *Reference) {
     Match(Reference->getNameInfo().getAsString(), Reference->getLocation());
     return true;
   }
 };

 class VarDeclVisitor : public ExpectedLocationVisitor<VarDeclVisitor> {
 public:
  bool VisitVarDecl(VarDecl *Variable) {
    Match(Variable->getNameAsString(), Variable->getLocStart());
    return true;
  }
 };

 class CXXMemberCallVisitor
   : public ExpectedLocationVisitor<CXXMemberCallVisitor> {
 public:
   bool VisitCXXMemberCallExpr(CXXMemberCallExpr *Call) {
     Match(Call->getMethodDecl()->getQualifiedNameAsString(),
           Call->getLocStart());
     return true;
   }
 };

 class NamedDeclVisitor
   : public ExpectedLocationVisitor<NamedDeclVisitor> {
 public:
   bool VisitNamedDecl(NamedDecl *Decl) {
     std::string NameWithTemplateArgs;
     llvm::raw_string_ostream OS(NameWithTemplateArgs);
     Decl->getNameForDiagnostic(OS,
                                Decl->getASTContext().getPrintingPolicy(),
                                true);
     Match(OS.str(), Decl->getLocation());
     return true;
   }
 };

 class CXXOperatorCallExprTraverser
   : public ExpectedLocationVisitor<CXXOperatorCallExprTraverser> {
 public:
   // Use Traverse, not Visit, to check that data recursion optimization isn't
   // bypassing the call of this function.
   bool TraverseCXXOperatorCallExpr(CXXOperatorCallExpr *CE) {
     Match(getOperatorSpelling(CE->getOperator()), CE->getExprLoc());
     return ExpectedLocationVisitor<CXXOperatorCallExprTraverser>::
         TraverseCXXOperatorCallExpr(CE);
   }
 };

 class ParenExprVisitor : public ExpectedLocationVisitor<ParenExprVisitor> {
 public:
   bool VisitParenExpr(ParenExpr *Parens) {
     Match("", Parens->getExprLoc());
     return true;
   }
 };

 class LambdaExprVisitor : public ExpectedLocationVisitor<LambdaExprVisitor> {
 public:
   bool VisitLambdaExpr(LambdaExpr *Lambda) {
     PendingBodies.push(Lambda);
     Match("", Lambda->getIntroducerRange().getBegin());
     return true;
   }
   /// For each call to VisitLambdaExpr, we expect a subsequent call (with
   /// proper nesting) to TraverseLambdaBody.
   bool TraverseLambdaBody(LambdaExpr *Lambda) {
     EXPECT_FALSE(PendingBodies.empty());
     EXPECT_EQ(PendingBodies.top(), Lambda);
     PendingBodies.pop();
     return TraverseStmt(Lambda->getBody());
   }
   /// Determine whether TraverseLambdaBody has been called for every call to
   /// VisitLambdaExpr.
   bool allBodiesHaveBeenTraversed() const {
     return PendingBodies.empty();
   }
 private:
   std::stack<LambdaExpr *> PendingBodies;
 };

 // Matches the (optional) capture-default of a lambda-introducer.
 class LambdaDefaultCaptureVisitor
   : public ExpectedLocationVisitor<LambdaDefaultCaptureVisitor> {
 public:
   bool VisitLambdaExpr(LambdaExpr *Lambda) {
     if (Lambda->getCaptureDefault() != LCD_None) {
       Match("", Lambda->getCaptureDefaultLoc());
     }
     return true;
   }
 };

 class TemplateArgumentLocTraverser
   : public ExpectedLocationVisitor<TemplateArgumentLocTraverser> {
 public:
   bool TraverseTemplateArgumentLoc(const TemplateArgumentLoc &ArgLoc) {
     std::string ArgStr;
     llvm::raw_string_ostream Stream(ArgStr);
     const TemplateArgument &Arg = ArgLoc.getArgument();

     Arg.print(Context->getPrintingPolicy(), Stream);
     Match(Stream.str(), ArgLoc.getLocation());
     return ExpectedLocationVisitor<TemplateArgumentLocTraverser>::
       TraverseTemplateArgumentLoc(ArgLoc);
   }
 };

 class CXXBoolLiteralExprVisitor
   : public ExpectedLocationVisitor<CXXBoolLiteralExprVisitor> {
 public:
   bool VisitCXXBoolLiteralExpr(CXXBoolLiteralExpr *BE) {
     if (BE->getValue())
       Match("true", BE->getLocation());
     else
       Match("false", BE->getLocation());
     return true;
   }
 };

 TEST(RecursiveASTVisitor, VisitsBaseClassDeclarations) {
   TypeLocVisitor Visitor;
   Visitor.ExpectMatch("class X", 1, 30);
   EXPECT_TRUE(Visitor.runOver("class X {}; class Y : public X {};"));
 }

 TEST(RecursiveASTVisitor, VisitsCXXBaseSpecifiersOfForwardDeclaredClass) {
   TypeLocVisitor Visitor;
   Visitor.ExpectMatch("class X", 3, 18);
   EXPECT_TRUE(Visitor.runOver(
     "class Y;\n"
     "class X {};\n"
     "class Y : public X {};"));
 }

 TEST(RecursiveASTVisitor, VisitsCXXBaseSpecifiersWithIncompleteInnerClass) {
   TypeLocVisitor Visitor;
   Visitor.ExpectMatch("class X", 2, 18);
   EXPECT_TRUE(Visitor.runOver(
     "class X {};\n"
     "class Y : public X { class Z; };"));
 }

 TEST(RecursiveASTVisitor, VisitsCXXBaseSpecifiersOfSelfReferentialType) {
   TypeLocVisitor Visitor;
   Visitor.ExpectMatch("X<class Y>", 2, 18);
   EXPECT_TRUE(Visitor.runOver(
     "template<typename T> class X {};\n"
     "class Y : public X<Y> {};"));
 }

 TEST(RecursiveASTVisitor, VisitsBaseClassTemplateArguments) {
   DeclRefExprVisitor Visitor;
   Visitor.ExpectMatch("x", 2, 3);
   EXPECT_TRUE(Visitor.runOver(
     "void x(); template <void (*T)()> class X {};\nX<x> y;"));
 }

 TEST(RecursiveASTVisitor, VisitsCXXForRangeStmtRange) {
   DeclRefExprVisitor Visitor;
   Visitor.ExpectMatch("x", 2, 25);
   Visitor.ExpectMatch("x", 2, 30);
   EXPECT_TRUE(Visitor.runOver(
     "int x[5];\n"
     "void f() { for (int i : x) { x[0] = 1; } }",
     DeclRefExprVisitor::Lang_CXX11));
 }

 TEST(RecursiveASTVisitor, VisitsCXXForRangeStmtLoopVariable) {
   VarDeclVisitor Visitor;
   Visitor.ExpectMatch("i", 2, 17);
   EXPECT_TRUE(Visitor.runOver(
     "int x[5];\n"
     "void f() { for (int i : x) {} }",
     VarDeclVisitor::Lang_CXX11));
 }

 TEST(RecursiveASTVisitor, VisitsCallExpr) {
   DeclRefExprVisitor Visitor;
   Visitor.ExpectMatch("x", 1, 22);
   EXPECT_TRUE(Visitor.runOver(
     "void x(); void y() { x(); }"));
 }

 TEST(RecursiveASTVisitor, VisitsCallInTemplateInstantiation) {
   CXXMemberCallVisitor Visitor;
   Visitor.ExpectMatch("Y::x", 3, 3);
   EXPECT_TRUE(Visitor.runOver(
     "struct Y { void x(); };\n"
     "template<typename T> void y(T t) {\n"
     "  t.x();\n"
     "}\n"
     "void foo() { y<Y>(Y()); }"));
 }

 TEST(RecursiveASTVisitor, VisitsCallInNestedFunctionTemplateInstantiation) {
   CXXMemberCallVisitor Visitor;
   Visitor.ExpectMatch("Y::x", 4, 5);
   EXPECT_TRUE(Visitor.runOver(
     "struct Y { void x(); };\n"
     "template<typename T> struct Z {\n"
     "  template<typename U> static void f() {\n"
     "    T().x();\n"
     "  }\n"
     "};\n"
     "void foo() { Z<Y>::f<int>(); }"));
 }

 TEST(RecursiveASTVisitor, VisitsCallInNestedClassTemplateInstantiation) {
   CXXMemberCallVisitor Visitor;
   Visitor.ExpectMatch("A::x", 5, 7);
   EXPECT_TRUE(Visitor.runOver(
     "template <typename T1> struct X {\n"
     "  template <typename T2> struct Y {\n"
     "    void f() {\n"
     "      T2 y;\n"
     "      y.x();\n"
     "    }\n"
     "  };\n"
     "};\n"
     "struct A { void x(); };\n"
     "int main() {\n"
     "  (new X<A>::Y<A>())->f();\n"
     "}"));
 }

 /* FIXME: According to Richard Smith this is a bug in the AST.
 TEST(RecursiveASTVisitor, VisitsBaseClassTemplateArgumentsInInstantiation) {
   DeclRefExprVisitor Visitor;
   Visitor.ExpectMatch("x", 3, 43);
   EXPECT_TRUE(Visitor.runOver(
     "template <typename T> void x();\n"
     "template <void (*T)()> class X {};\n"
     "template <typename T> class Y : public X< x<T> > {};\n"
     "Y<int> y;"));
 }
 */

 TEST(RecursiveASTVisitor, VisitsCallInPartialTemplateSpecialization) {
   CXXMemberCallVisitor Visitor;
   Visitor.ExpectMatch("A::x", 6, 20);
   EXPECT_TRUE(Visitor.runOver(
     "template <typename T1> struct X {\n"
     "  template <typename T2, bool B> struct Y { void g(); };\n"
     "};\n"
     "template <typename T1> template <typename T2>\n"
     "struct X<T1>::Y<T2, true> {\n"
     "  void f() { T2 y; y.x(); }\n"
     "};\n"
     "struct A { void x(); };\n"
     "int main() {\n"
     "  (new X<A>::Y<A, true>())->f();\n"
     "}\n"));
 }

 TEST(RecursiveASTVisitor, VisitsExplicitTemplateSpecialization) {
   CXXMemberCallVisitor Visitor;
   Visitor.ExpectMatch("A::f", 4, 5);
   EXPECT_TRUE(Visitor.runOver(
     "struct A {\n"
     "  void f() const {}\n"
     "  template<class T> void g(const T& t) const {\n"
     "    t.f();\n"
     "  }\n"
     "};\n"
     "template void A::g(const A& a) const;\n"));
 }

 TEST(RecursiveASTVisitor, VisitsPartialTemplateSpecialization) {
   // From cfe-commits/Week-of-Mon-20100830/033998.html
   // Contrary to the approach suggested in that email, we visit all
   // specializations when we visit the primary template.  Visiting them when we
   // visit the associated specialization is problematic for specializations of
   // template members of class templates.
   NamedDeclVisitor Visitor;
   Visitor.ExpectMatch("A<bool>", 1, 26);
   Visitor.ExpectMatch("A<char *>", 2, 26);
   EXPECT_TRUE(Visitor.runOver(
     "template <class T> class A {};\n"
     "template <class T> class A<T*> {};\n"
     "A<bool> ab;\n"
     "A<char*> acp;\n"));
 }

 TEST(RecursiveASTVisitor, VisitsUndefinedClassTemplateSpecialization) {
   NamedDeclVisitor Visitor;
   Visitor.ExpectMatch("A<int>", 1, 29);
   EXPECT_TRUE(Visitor.runOver(
     "template<typename T> struct A;\n"
     "A<int> *p;\n"));
 }

 TEST(RecursiveASTVisitor, VisitsNestedUndefinedClassTemplateSpecialization) {
   NamedDeclVisitor Visitor;
   Visitor.ExpectMatch("A<int>::B<char>", 2, 31);
   EXPECT_TRUE(Visitor.runOver(
     "template<typename T> struct A {\n"
     "  template<typename U> struct B;\n"
     "};\n"
     "A<int>::B<char> *p;\n"));
 }

 TEST(RecursiveASTVisitor, VisitsUndefinedFunctionTemplateSpecialization) {
   NamedDeclVisitor Visitor;
   Visitor.ExpectMatch("A<int>", 1, 26);
   EXPECT_TRUE(Visitor.runOver(
     "template<typename T> int A();\n"
     "int k = A<int>();\n"));
 }

 TEST(RecursiveASTVisitor, VisitsNestedUndefinedFunctionTemplateSpecialization) {
   NamedDeclVisitor Visitor;
   Visitor.ExpectMatch("A<int>::B<char>", 2, 35);
   EXPECT_TRUE(Visitor.runOver(
     "template<typename T> struct A {\n"
     "  template<typename U> static int B();\n"
     "};\n"
     "int k = A<int>::B<char>();\n"));
 }

 TEST(RecursiveASTVisitor, NoRecursionInSelfFriend) {
   // From cfe-commits/Week-of-Mon-20100830/033977.html
   NamedDeclVisitor Visitor;
   Visitor.ExpectMatch("vector_iterator<int>", 2, 7);
   EXPECT_TRUE(Visitor.runOver(
     "template<typename Container>\n"
     "class vector_iterator {\n"
     "    template <typename C> friend class vector_iterator;\n"
     "};\n"
     "vector_iterator<int> it_int;\n"));
 }

 TEST(RecursiveASTVisitor, TraversesOverloadedOperator) {
   CXXOperatorCallExprTraverser Visitor;
   Visitor.ExpectMatch("()", 4, 9);
   EXPECT_TRUE(Visitor.runOver(
     "struct A {\n"
     "  int operator()();\n"
     "} a;\n"
     "int k = a();\n"));
 }

 TEST(RecursiveASTVisitor, VisitsParensDuringDataRecursion) {
   ParenExprVisitor Visitor;
   Visitor.ExpectMatch("", 1, 9);
   EXPECT_TRUE(Visitor.runOver("int k = (4) + 9;\n"));
 }

 TEST(RecursiveASTVisitor, VisitsClassTemplateNonTypeParmDefaultArgument) {
   CXXBoolLiteralExprVisitor Visitor;
   Visitor.ExpectMatch("true", 2, 19);
   EXPECT_TRUE(Visitor.runOver(
     "template<bool B> class X;\n"
     "template<bool B = true> class Y;\n"
     "template<bool B> class Y {};\n"));
 }

 TEST(RecursiveASTVisitor, VisitsClassTemplateTypeParmDefaultArgument) {
   TypeLocVisitor Visitor;
   Visitor.ExpectMatch("class X", 2, 23);
   EXPECT_TRUE(Visitor.runOver(
     "class X;\n"
     "template<typename T = X> class Y;\n"
     "template<typename T> class Y {};\n"));
 }

 TEST(RecursiveASTVisitor, VisitsClassTemplateTemplateParmDefaultArgument) {
   TemplateArgumentLocTraverser Visitor;
   Visitor.ExpectMatch("X", 2, 40);
   EXPECT_TRUE(Visitor.runOver(
     "template<typename T> class X;\n"
     "template<template <typename> class T = X> class Y;\n"
     "template<template <typename> class T> class Y {};\n"));
 }

 // A visitor that visits implicit declarations and matches constructors.
 class ImplicitCtorVisitor
     : public ExpectedLocationVisitor<ImplicitCtorVisitor> {
 public:
   bool shouldVisitImplicitCode() const { return true; }

   bool VisitCXXConstructorDecl(CXXConstructorDecl* Ctor) {
     if (Ctor->isImplicit()) {  // Was not written in source code
       if (const CXXRecordDecl* Class = Ctor->getParent()) {
         Match(Class->getName(), Ctor->getLocation());
       }
     }
     return true;
   }
 };

 TEST(RecursiveASTVisitor, VisitsImplicitCopyConstructors) {
   ImplicitCtorVisitor Visitor;
   Visitor.ExpectMatch("Simple", 2, 8);
   // Note: Clang lazily instantiates implicit declarations, so we need
   // to use them in order to force them to appear in the AST.
   EXPECT_TRUE(Visitor.runOver(
       "struct WithCtor { WithCtor(); }; \n"
       "struct Simple { Simple(); WithCtor w; }; \n"
       "int main() { Simple s; Simple t(s); }\n"));
 }

 /// \brief A visitor that optionally includes implicit code and matches
 /// CXXConstructExpr.
 ///
 /// The name recorded for the match is the name of the class whose constructor
 /// is invoked by the CXXConstructExpr, not the name of the class whose
 /// constructor the CXXConstructExpr is contained in.
 class ConstructExprVisitor
     : public ExpectedLocationVisitor<ConstructExprVisitor> {
 public:
   ConstructExprVisitor() : ShouldVisitImplicitCode(false) {}

   bool shouldVisitImplicitCode() const { return ShouldVisitImplicitCode; }

   void setShouldVisitImplicitCode(bool NewValue) {
     ShouldVisitImplicitCode = NewValue;
   }

   bool VisitCXXConstructExpr(CXXConstructExpr* Expr) {
     if (const CXXConstructorDecl* Ctor = Expr->getConstructor()) {
       if (const CXXRecordDecl* Class = Ctor->getParent()) {
         Match(Class->getName(), Expr->getLocation());
       }
     }
     return true;
   }

  private:
   bool ShouldVisitImplicitCode;
 };

 TEST(RecursiveASTVisitor, CanVisitImplicitMemberInitializations) {
   ConstructExprVisitor Visitor;
   Visitor.setShouldVisitImplicitCode(true);
   Visitor.ExpectMatch("WithCtor", 2, 8);
   // Simple has a constructor that implicitly initializes 'w'.  Test
   // that a visitor that visits implicit code visits that initialization.
   // Note: Clang lazily instantiates implicit declarations, so we need
   // to use them in order to force them to appear in the AST.
   EXPECT_TRUE(Visitor.runOver(
       "struct WithCtor { WithCtor(); }; \n"
       "struct Simple { WithCtor w; }; \n"
       "int main() { Simple s; }\n"));
 }

 // The same as CanVisitImplicitMemberInitializations, but checking that the
 // visits are omitted when the visitor does not include implicit code.
 TEST(RecursiveASTVisitor, CanSkipImplicitMemberInitializations) {
   ConstructExprVisitor Visitor;
   Visitor.setShouldVisitImplicitCode(false);
   Visitor.DisallowMatch("WithCtor", 2, 8);
   // Simple has a constructor that implicitly initializes 'w'.  Test
   // that a visitor that skips implicit code skips that initialization.
   // Note: Clang lazily instantiates implicit declarations, so we need
   // to use them in order to force them to appear in the AST.
   EXPECT_TRUE(Visitor.runOver(
       "struct WithCtor { WithCtor(); }; \n"
       "struct Simple { WithCtor w; }; \n"
       "int main() { Simple s; }\n"));
 }

 TEST(RecursiveASTVisitor, VisitsExtension) {
   DeclRefExprVisitor Visitor;
   Visitor.ExpectMatch("s", 1, 24);
   EXPECT_TRUE(Visitor.runOver(
     "int s = __extension__ (s);\n"));
 }

 TEST(RecursiveASTVisitor, VisitsCompoundLiteralType) {
   TypeLocVisitor Visitor;
   Visitor.ExpectMatch("struct S", 1, 26);
   EXPECT_TRUE(Visitor.runOver(
       "int f() { return (struct S { int a; }){.a = 0}.a; }",
       TypeLocVisitor::Lang_C));
 }

 TEST(RecursiveASTVisitor, VisitsLambdaExpr) {
   LambdaExprVisitor Visitor;
   Visitor.ExpectMatch("", 1, 12);
   EXPECT_TRUE(Visitor.runOver("void f() { []{ return; }(); }",
 			      LambdaExprVisitor::Lang_CXX11));
 }

 TEST(RecursiveASTVisitor, TraverseLambdaBodyCanBeOverridden) {
   LambdaExprVisitor Visitor;
   EXPECT_TRUE(Visitor.runOver("void f() { []{ return; }(); }",
 			      LambdaExprVisitor::Lang_CXX11));
   EXPECT_TRUE(Visitor.allBodiesHaveBeenTraversed());
 }

 TEST(RecursiveASTVisitor, HasCaptureDefaultLoc) {
   LambdaDefaultCaptureVisitor Visitor;
   Visitor.ExpectMatch("", 1, 20);
   EXPECT_TRUE(Visitor.runOver("void f() { int a; [=]{a;}; }",
                               LambdaDefaultCaptureVisitor::Lang_CXX11));
 }

 } // end namespace clang
	//===- unittest/Tooling/RecursiveASTVisitorTest.cpp -----------------------===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file is distributed under the University of Illinois Open Source
	// License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//

	#include "TestVisitor.h"

	#include <stack>

	namespace clang {

	class TypeLocVisitor : public ExpectedLocationVisitor<TypeLocVisitor> {
	public:
	bool VisitTypeLoc(TypeLoc TypeLocation) {
	Match(TypeLocation.getType().getAsString(), TypeLocation.getBeginLoc());
	return true;
	}
	};

	class DeclRefExprVisitor : public ExpectedLocationVisitor<DeclRefExprVisitor> {
	public:
	bool VisitDeclRefExpr(DeclRefExpr *Reference) {
	Match(Reference->getNameInfo().getAsString(), Reference->getLocation());
	return true;
	}
	};

	class VarDeclVisitor : public ExpectedLocationVisitor<VarDeclVisitor> {
	public:
	bool VisitVarDecl(VarDecl *Variable) {
	Match(Variable->getNameAsString(), Variable->getLocStart());
	return true;
	}
	};

	class CXXMemberCallVisitor
	: public ExpectedLocationVisitor<CXXMemberCallVisitor> {
	public:
	bool VisitCXXMemberCallExpr(CXXMemberCallExpr *Call) {
	Match(Call->getMethodDecl()->getQualifiedNameAsString(),
	Call->getLocStart());
	return true;
	}
	};

	class NamedDeclVisitor
	: public ExpectedLocationVisitor<NamedDeclVisitor> {
	public:
	bool VisitNamedDecl(NamedDecl *Decl) {
	std::string NameWithTemplateArgs;
	llvm::raw_string_ostream OS(NameWithTemplateArgs);
	Decl->getNameForDiagnostic(OS,
	Decl->getASTContext().getPrintingPolicy(),
	true);
	Match(OS.str(), Decl->getLocation());
	return true;
	}
	};

	class CXXOperatorCallExprTraverser
	: public ExpectedLocationVisitor<CXXOperatorCallExprTraverser> {
	public:
	// Use Traverse, not Visit, to check that data recursion optimization isn't
	// bypassing the call of this function.
	bool TraverseCXXOperatorCallExpr(CXXOperatorCallExpr *CE) {
	Match(getOperatorSpelling(CE->getOperator()), CE->getExprLoc());
	return ExpectedLocationVisitor<CXXOperatorCallExprTraverser>::
	TraverseCXXOperatorCallExpr(CE);
	}
	};

	class ParenExprVisitor : public ExpectedLocationVisitor<ParenExprVisitor> {
	public:
	bool VisitParenExpr(ParenExpr *Parens) {
	Match("", Parens->getExprLoc());
	return true;
	}
	};

	class LambdaExprVisitor : public ExpectedLocationVisitor<LambdaExprVisitor> {
	public:
	bool VisitLambdaExpr(LambdaExpr *Lambda) {
	PendingBodies.push(Lambda);
	Match("", Lambda->getIntroducerRange().getBegin());
	return true;
	}
	/// For each call to VisitLambdaExpr, we expect a subsequent call (with
	/// proper nesting) to TraverseLambdaBody.
	bool TraverseLambdaBody(LambdaExpr *Lambda) {
	EXPECT_FALSE(PendingBodies.empty());
	EXPECT_EQ(PendingBodies.top(), Lambda);
	PendingBodies.pop();
	return TraverseStmt(Lambda->getBody());
	}
	/// Determine whether TraverseLambdaBody has been called for every call to
	/// VisitLambdaExpr.
	bool allBodiesHaveBeenTraversed() const {
	return PendingBodies.empty();
	}
	private:
	std::stack<LambdaExpr *> PendingBodies;
	};

	// Matches the (optional) capture-default of a lambda-introducer.
	class LambdaDefaultCaptureVisitor
	: public ExpectedLocationVisitor<LambdaDefaultCaptureVisitor> {
	public:
	bool VisitLambdaExpr(LambdaExpr *Lambda) {
	if (Lambda->getCaptureDefault() != LCD_None) {
	Match("", Lambda->getCaptureDefaultLoc());
	}
	return true;
	}
	};

	class TemplateArgumentLocTraverser
	: public ExpectedLocationVisitor<TemplateArgumentLocTraverser> {
	public:
	bool TraverseTemplateArgumentLoc(const TemplateArgumentLoc &ArgLoc) {
	std::string ArgStr;
	llvm::raw_string_ostream Stream(ArgStr);
	const TemplateArgument &Arg = ArgLoc.getArgument();

	Arg.print(Context->getPrintingPolicy(), Stream);
	Match(Stream.str(), ArgLoc.getLocation());
	return ExpectedLocationVisitor<TemplateArgumentLocTraverser>::
	TraverseTemplateArgumentLoc(ArgLoc);
	}
	};

	class CXXBoolLiteralExprVisitor
	: public ExpectedLocationVisitor<CXXBoolLiteralExprVisitor> {
	public:
	bool VisitCXXBoolLiteralExpr(CXXBoolLiteralExpr *BE) {
	if (BE->getValue())
	Match("true", BE->getLocation());
	else
	Match("false", BE->getLocation());
	return true;
	}
	};

	TEST(RecursiveASTVisitor, VisitsBaseClassDeclarations) {
	TypeLocVisitor Visitor;
	Visitor.ExpectMatch("class X", 1, 30);
	EXPECT_TRUE(Visitor.runOver("class X {}; class Y : public X {};"));
	}

	TEST(RecursiveASTVisitor, VisitsCXXBaseSpecifiersOfForwardDeclaredClass) {
	TypeLocVisitor Visitor;
	Visitor.ExpectMatch("class X", 3, 18);
	EXPECT_TRUE(Visitor.runOver(
	"class Y;\n"
	"class X {};\n"
	"class Y : public X {};"));
	}

	TEST(RecursiveASTVisitor, VisitsCXXBaseSpecifiersWithIncompleteInnerClass) {
	TypeLocVisitor Visitor;
	Visitor.ExpectMatch("class X", 2, 18);
	EXPECT_TRUE(Visitor.runOver(
	"class X {};\n"
	"class Y : public X { class Z; };"));
	}

	TEST(RecursiveASTVisitor, VisitsCXXBaseSpecifiersOfSelfReferentialType) {
	TypeLocVisitor Visitor;
	Visitor.ExpectMatch("X<class Y>", 2, 18);
	EXPECT_TRUE(Visitor.runOver(
	"template<typename T> class X {};\n"
	"class Y : public X<Y> {};"));
	}

	TEST(RecursiveASTVisitor, VisitsBaseClassTemplateArguments) {
	DeclRefExprVisitor Visitor;
	Visitor.ExpectMatch("x", 2, 3);
	EXPECT_TRUE(Visitor.runOver(
	"void x(); template <void (*T)()> class X {};\nX<x> y;"));
	}

	TEST(RecursiveASTVisitor, VisitsCXXForRangeStmtRange) {
	DeclRefExprVisitor Visitor;
	Visitor.ExpectMatch("x", 2, 25);
	Visitor.ExpectMatch("x", 2, 30);
	EXPECT_TRUE(Visitor.runOver(
	"int x[5];\n"
	"void f() { for (int i : x) { x[0] = 1; } }",
	DeclRefExprVisitor::Lang_CXX11));
	}

	TEST(RecursiveASTVisitor, VisitsCXXForRangeStmtLoopVariable) {
	VarDeclVisitor Visitor;
	Visitor.ExpectMatch("i", 2, 17);
	EXPECT_TRUE(Visitor.runOver(
	"int x[5];\n"
	"void f() { for (int i : x) {} }",
	VarDeclVisitor::Lang_CXX11));
	}

	TEST(RecursiveASTVisitor, VisitsCallExpr) {
	DeclRefExprVisitor Visitor;
	Visitor.ExpectMatch("x", 1, 22);
	EXPECT_TRUE(Visitor.runOver(
	"void x(); void y() { x(); }"));
	}

	TEST(RecursiveASTVisitor, VisitsCallInTemplateInstantiation) {
	CXXMemberCallVisitor Visitor;
	Visitor.ExpectMatch("Y::x", 3, 3);
	EXPECT_TRUE(Visitor.runOver(
	"struct Y { void x(); };\n"
	"template<typename T> void y(T t) {\n"
	" t.x();\n"
	"}\n"
	"void foo() { y<Y>(Y()); }"));
	}

	TEST(RecursiveASTVisitor, VisitsCallInNestedFunctionTemplateInstantiation) {
	CXXMemberCallVisitor Visitor;
	Visitor.ExpectMatch("Y::x", 4, 5);
	EXPECT_TRUE(Visitor.runOver(
	"struct Y { void x(); };\n"
	"template<typename T> struct Z {\n"
	" template<typename U> static void f() {\n"
	" T().x();\n"
	" }\n"
	"};\n"
	"void foo() { Z<Y>::f<int>(); }"));
	}

	TEST(RecursiveASTVisitor, VisitsCallInNestedClassTemplateInstantiation) {
	CXXMemberCallVisitor Visitor;
	Visitor.ExpectMatch("A::x", 5, 7);
	EXPECT_TRUE(Visitor.runOver(
	"template <typename T1> struct X {\n"
	" template <typename T2> struct Y {\n"
	" void f() {\n"
	" T2 y;\n"
	" y.x();\n"
	" }\n"
	" };\n"
	"};\n"
	"struct A { void x(); };\n"
	"int main() {\n"
	" (new X<A>::Y<A>())->f();\n"
	"}"));
	}

	/* FIXME: According to Richard Smith this is a bug in the AST.
	TEST(RecursiveASTVisitor, VisitsBaseClassTemplateArgumentsInInstantiation) {
	DeclRefExprVisitor Visitor;
	Visitor.ExpectMatch("x", 3, 43);
	EXPECT_TRUE(Visitor.runOver(
	"template <typename T> void x();\n"
	"template <void (*T)()> class X {};\n"
	"template <typename T> class Y : public X< x<T> > {};\n"
	"Y<int> y;"));
	}
	*/

	TEST(RecursiveASTVisitor, VisitsCallInPartialTemplateSpecialization) {
	CXXMemberCallVisitor Visitor;
	Visitor.ExpectMatch("A::x", 6, 20);
	EXPECT_TRUE(Visitor.runOver(
	"template <typename T1> struct X {\n"
	" template <typename T2, bool B> struct Y { void g(); };\n"
	"};\n"
	"template <typename T1> template <typename T2>\n"
	"struct X<T1>::Y<T2, true> {\n"
	" void f() { T2 y; y.x(); }\n"
	"};\n"
	"struct A { void x(); };\n"
	"int main() {\n"
	" (new X<A>::Y<A, true>())->f();\n"
	"}\n"));
	}

	TEST(RecursiveASTVisitor, VisitsExplicitTemplateSpecialization) {
	CXXMemberCallVisitor Visitor;
	Visitor.ExpectMatch("A::f", 4, 5);
	EXPECT_TRUE(Visitor.runOver(
	"struct A {\n"
	" void f() const {}\n"
	" template<class T> void g(const T& t) const {\n"
	" t.f();\n"
	" }\n"
	"};\n"
	"template void A::g(const A& a) const;\n"));
	}

	TEST(RecursiveASTVisitor, VisitsPartialTemplateSpecialization) {
	// From cfe-commits/Week-of-Mon-20100830/033998.html
	// Contrary to the approach suggested in that email, we visit all
	// specializations when we visit the primary template. Visiting them when we
	// visit the associated specialization is problematic for specializations of
	// template members of class templates.
	NamedDeclVisitor Visitor;
	Visitor.ExpectMatch("A<bool>", 1, 26);
	Visitor.ExpectMatch("A<char *>", 2, 26);
	EXPECT_TRUE(Visitor.runOver(
	"template <class T> class A {};\n"
	"template <class T> class A<T*> {};\n"
	"A<bool> ab;\n"
	"A<char*> acp;\n"));
	}

	TEST(RecursiveASTVisitor, VisitsUndefinedClassTemplateSpecialization) {
	NamedDeclVisitor Visitor;
	Visitor.ExpectMatch("A<int>", 1, 29);
	EXPECT_TRUE(Visitor.runOver(
	"template<typename T> struct A;\n"
	"A<int> *p;\n"));
	}

	TEST(RecursiveASTVisitor, VisitsNestedUndefinedClassTemplateSpecialization) {
	NamedDeclVisitor Visitor;
	Visitor.ExpectMatch("A<int>::B<char>", 2, 31);
	EXPECT_TRUE(Visitor.runOver(
	"template<typename T> struct A {\n"
	" template<typename U> struct B;\n"
	"};\n"
	"A<int>::B<char> *p;\n"));
	}

	TEST(RecursiveASTVisitor, VisitsUndefinedFunctionTemplateSpecialization) {
	NamedDeclVisitor Visitor;
	Visitor.ExpectMatch("A<int>", 1, 26);
	EXPECT_TRUE(Visitor.runOver(
	"template<typename T> int A();\n"
	"int k = A<int>();\n"));
	}

	TEST(RecursiveASTVisitor, VisitsNestedUndefinedFunctionTemplateSpecialization) {
	NamedDeclVisitor Visitor;
	Visitor.ExpectMatch("A<int>::B<char>", 2, 35);
	EXPECT_TRUE(Visitor.runOver(
	"template<typename T> struct A {\n"
	" template<typename U> static int B();\n"
	"};\n"
	"int k = A<int>::B<char>();\n"));
	}

	TEST(RecursiveASTVisitor, NoRecursionInSelfFriend) {
	// From cfe-commits/Week-of-Mon-20100830/033977.html
	NamedDeclVisitor Visitor;
	Visitor.ExpectMatch("vector_iterator<int>", 2, 7);
	EXPECT_TRUE(Visitor.runOver(
	"template<typename Container>\n"
	"class vector_iterator {\n"
	" template <typename C> friend class vector_iterator;\n"
	"};\n"
	"vector_iterator<int> it_int;\n"));
	}

	TEST(RecursiveASTVisitor, TraversesOverloadedOperator) {
	CXXOperatorCallExprTraverser Visitor;
	Visitor.ExpectMatch("()", 4, 9);
	EXPECT_TRUE(Visitor.runOver(
	"struct A {\n"
	" int operator()();\n"
	"} a;\n"
	"int k = a();\n"));
	}

	TEST(RecursiveASTVisitor, VisitsParensDuringDataRecursion) {
	ParenExprVisitor Visitor;
	Visitor.ExpectMatch("", 1, 9);
	EXPECT_TRUE(Visitor.runOver("int k = (4) + 9;\n"));
	}

	TEST(RecursiveASTVisitor, VisitsClassTemplateNonTypeParmDefaultArgument) {
	CXXBoolLiteralExprVisitor Visitor;
	Visitor.ExpectMatch("true", 2, 19);
	EXPECT_TRUE(Visitor.runOver(
	"template<bool B> class X;\n"
	"template<bool B = true> class Y;\n"
	"template<bool B> class Y {};\n"));
	}

	TEST(RecursiveASTVisitor, VisitsClassTemplateTypeParmDefaultArgument) {
	TypeLocVisitor Visitor;
	Visitor.ExpectMatch("class X", 2, 23);
	EXPECT_TRUE(Visitor.runOver(
	"class X;\n"
	"template<typename T = X> class Y;\n"
	"template<typename T> class Y {};\n"));
	}

	TEST(RecursiveASTVisitor, VisitsClassTemplateTemplateParmDefaultArgument) {
	TemplateArgumentLocTraverser Visitor;
	Visitor.ExpectMatch("X", 2, 40);
	EXPECT_TRUE(Visitor.runOver(
	"template<typename T> class X;\n"
	"template<template <typename> class T = X> class Y;\n"
	"template<template <typename> class T> class Y {};\n"));
	}

	// A visitor that visits implicit declarations and matches constructors.
	class ImplicitCtorVisitor
	: public ExpectedLocationVisitor<ImplicitCtorVisitor> {
	public:
	bool shouldVisitImplicitCode() const { return true; }

	bool VisitCXXConstructorDecl(CXXConstructorDecl* Ctor) {
	if (Ctor->isImplicit()) { // Was not written in source code
	if (const CXXRecordDecl* Class = Ctor->getParent()) {
	Match(Class->getName(), Ctor->getLocation());
	}
	}
	return true;
	}
	};

	TEST(RecursiveASTVisitor, VisitsImplicitCopyConstructors) {
	ImplicitCtorVisitor Visitor;
	Visitor.ExpectMatch("Simple", 2, 8);
	// Note: Clang lazily instantiates implicit declarations, so we need
	// to use them in order to force them to appear in the AST.
	EXPECT_TRUE(Visitor.runOver(
	"struct WithCtor { WithCtor(); }; \n"
	"struct Simple { Simple(); WithCtor w; }; \n"
	"int main() { Simple s; Simple t(s); }\n"));
	}

	/// \brief A visitor that optionally includes implicit code and matches
	/// CXXConstructExpr.
	///
	/// The name recorded for the match is the name of the class whose constructor
	/// is invoked by the CXXConstructExpr, not the name of the class whose
	/// constructor the CXXConstructExpr is contained in.
	class ConstructExprVisitor
	: public ExpectedLocationVisitor<ConstructExprVisitor> {
	public:
	ConstructExprVisitor() : ShouldVisitImplicitCode(false) {}

	bool shouldVisitImplicitCode() const { return ShouldVisitImplicitCode; }

	void setShouldVisitImplicitCode(bool NewValue) {
	ShouldVisitImplicitCode = NewValue;
	}

	bool VisitCXXConstructExpr(CXXConstructExpr* Expr) {
	if (const CXXConstructorDecl* Ctor = Expr->getConstructor()) {
	if (const CXXRecordDecl* Class = Ctor->getParent()) {
	Match(Class->getName(), Expr->getLocation());
	}
	}
	return true;
	}

	private:
	bool ShouldVisitImplicitCode;
	};

	TEST(RecursiveASTVisitor, CanVisitImplicitMemberInitializations) {
	ConstructExprVisitor Visitor;
	Visitor.setShouldVisitImplicitCode(true);
	Visitor.ExpectMatch("WithCtor", 2, 8);
	// Simple has a constructor that implicitly initializes 'w'. Test
	// that a visitor that visits implicit code visits that initialization.
	// Note: Clang lazily instantiates implicit declarations, so we need
	// to use them in order to force them to appear in the AST.
	EXPECT_TRUE(Visitor.runOver(
	"struct WithCtor { WithCtor(); }; \n"
	"struct Simple { WithCtor w; }; \n"
	"int main() { Simple s; }\n"));
	}

	// The same as CanVisitImplicitMemberInitializations, but checking that the
	// visits are omitted when the visitor does not include implicit code.
	TEST(RecursiveASTVisitor, CanSkipImplicitMemberInitializations) {
	ConstructExprVisitor Visitor;
	Visitor.setShouldVisitImplicitCode(false);
	Visitor.DisallowMatch("WithCtor", 2, 8);
	// Simple has a constructor that implicitly initializes 'w'. Test
	// that a visitor that skips implicit code skips that initialization.
	// Note: Clang lazily instantiates implicit declarations, so we need
	// to use them in order to force them to appear in the AST.
	EXPECT_TRUE(Visitor.runOver(
	"struct WithCtor { WithCtor(); }; \n"
	"struct Simple { WithCtor w; }; \n"
	"int main() { Simple s; }\n"));
	}

	TEST(RecursiveASTVisitor, VisitsExtension) {
	DeclRefExprVisitor Visitor;
	Visitor.ExpectMatch("s", 1, 24);
	EXPECT_TRUE(Visitor.runOver(
	"int s = __extension__ (s);\n"));
	}

	TEST(RecursiveASTVisitor, VisitsCompoundLiteralType) {
	TypeLocVisitor Visitor;
	Visitor.ExpectMatch("struct S", 1, 26);
	EXPECT_TRUE(Visitor.runOver(
	"int f() { return (struct S { int a; }){.a = 0}.a; }",
	TypeLocVisitor::Lang_C));
	}

	TEST(RecursiveASTVisitor, VisitsLambdaExpr) {
	LambdaExprVisitor Visitor;
	Visitor.ExpectMatch("", 1, 12);
	EXPECT_TRUE(Visitor.runOver("void f() { []{ return; }(); }",
	LambdaExprVisitor::Lang_CXX11));
	}

	TEST(RecursiveASTVisitor, TraverseLambdaBodyCanBeOverridden) {
	LambdaExprVisitor Visitor;
	EXPECT_TRUE(Visitor.runOver("void f() { []{ return; }(); }",
	LambdaExprVisitor::Lang_CXX11));
	EXPECT_TRUE(Visitor.allBodiesHaveBeenTraversed());
	}

	TEST(RecursiveASTVisitor, HasCaptureDefaultLoc) {
	LambdaDefaultCaptureVisitor Visitor;
	Visitor.ExpectMatch("", 1, 20);
	EXPECT_TRUE(Visitor.runOver("void f() { int a; [=]{a;}; }",
	LambdaDefaultCaptureVisitor::Lang_CXX11));
	}

	} // end namespace clang