clang/unittests/Tooling/RecursiveASTVisitorTestDeclVisitor.cpp

   1 //===- unittest/Tooling/RecursiveASTVisitorTestDeclVisitor.cpp ------------===//
   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 #include "TestVisitor.h"
  10
  11 using namespace clang;
  12
  13 namespace {
  14
  15 class VarDeclVisitor : public ExpectedLocationVisitor {
  16 public:
  17   bool VisitVarDecl(VarDecl *Variable) override {
  18     Match(Variable->getNameAsString(), Variable->getBeginLoc());
  19     return true;
  20   }
  21 };
  22
  23 TEST(RecursiveASTVisitor, VisitsCXXForRangeStmtLoopVariable) {
  24   VarDeclVisitor Visitor;
  25   Visitor.ExpectMatch("i", 2, 17);
  26   EXPECT_TRUE(Visitor.runOver(
  27     "int x[5];\n"
  28     "void f() { for (int i : x) {} }",
  29     VarDeclVisitor::Lang_CXX11));
  30 }
  31
  32 class ParmVarDeclVisitorForImplicitCode : public ExpectedLocationVisitor {
  33 public:
  34   ParmVarDeclVisitorForImplicitCode() { ShouldVisitImplicitCode = true; }
  35
  36   bool VisitParmVarDecl(ParmVarDecl *ParamVar) override {
  37     Match(ParamVar->getNameAsString(), ParamVar->getBeginLoc());
  38     return true;
  39   }
  40 };
  41
  42 // Test RAV visits parameter variable declaration of the implicit
  43 // copy assignment operator and implicit copy constructor.
  44 TEST(RecursiveASTVisitor, VisitsParmVarDeclForImplicitCode) {
  45   ParmVarDeclVisitorForImplicitCode Visitor;
  46   // Match parameter variable name of implicit copy assignment operator and
  47   // implicit copy constructor.
  48   // This parameter name does not have a valid IdentifierInfo, and shares
  49   // same SourceLocation with its class declaration, so we match an empty name
  50   // with the class' source location.
  51   Visitor.ExpectMatch("", 1, 7);
  52   Visitor.ExpectMatch("", 3, 7);
  53   EXPECT_TRUE(Visitor.runOver(
  54     "class X {};\n"
  55     "void foo(X a, X b) {a = b;}\n"
  56     "class Y {};\n"
  57     "void bar(Y a) {Y b = a;}"));
  58 }
  59
  60 class NamedDeclVisitor : public ExpectedLocationVisitor {
  61 public:
  62   bool VisitNamedDecl(NamedDecl *Decl) override {
  63     std::string NameWithTemplateArgs;
  64     llvm::raw_string_ostream OS(NameWithTemplateArgs);
  65     Decl->getNameForDiagnostic(OS,
  66                                Decl->getASTContext().getPrintingPolicy(),
  67                                true);
  68     Match(NameWithTemplateArgs, Decl->getLocation());
  69     return true;
  70   }
  71 };
  72
  73 TEST(RecursiveASTVisitor, VisitsPartialTemplateSpecialization) {
  74   // From cfe-commits/Week-of-Mon-20100830/033998.html
  75   // Contrary to the approach suggested in that email, we visit all
  76   // specializations when we visit the primary template.  Visiting them when we
  77   // visit the associated specialization is problematic for specializations of
  78   // template members of class templates.
  79   NamedDeclVisitor Visitor;
  80   Visitor.ExpectMatch("A<bool>", 1, 26);
  81   Visitor.ExpectMatch("A<char *>", 2, 26);
  82   EXPECT_TRUE(Visitor.runOver(
  83     "template <class T> class A {};\n"
  84     "template <class T> class A<T*> {};\n"
  85     "A<bool> ab;\n"
  86     "A<char*> acp;\n"));
  87 }
  88
  89 TEST(RecursiveASTVisitor, VisitsUndefinedClassTemplateSpecialization) {
  90   NamedDeclVisitor Visitor;
  91   Visitor.ExpectMatch("A<int>", 1, 29);
  92   EXPECT_TRUE(Visitor.runOver(
  93     "template<typename T> struct A;\n"
  94     "A<int> *p;\n"));
  95 }
  96
  97 TEST(RecursiveASTVisitor, VisitsNestedUndefinedClassTemplateSpecialization) {
  98   NamedDeclVisitor Visitor;
  99   Visitor.ExpectMatch("A<int>::B<char>", 2, 31);
 100   EXPECT_TRUE(Visitor.runOver(
 101     "template<typename T> struct A {\n"
 102     "  template<typename U> struct B;\n"
 103     "};\n"
 104     "A<int>::B<char> *p;\n"));
 105 }
 106
 107 TEST(RecursiveASTVisitor, VisitsUndefinedFunctionTemplateSpecialization) {
 108   NamedDeclVisitor Visitor;
 109   Visitor.ExpectMatch("A<int>", 1, 26);
 110   EXPECT_TRUE(Visitor.runOver(
 111     "template<typename T> int A();\n"
 112     "int k = A<int>();\n"));
 113 }
 114
 115 TEST(RecursiveASTVisitor, VisitsNestedUndefinedFunctionTemplateSpecialization) {
 116   NamedDeclVisitor Visitor;
 117   Visitor.ExpectMatch("A<int>::B<char>", 2, 35);
 118   EXPECT_TRUE(Visitor.runOver(
 119     "template<typename T> struct A {\n"
 120     "  template<typename U> static int B();\n"
 121     "};\n"
 122     "int k = A<int>::B<char>();\n"));
 123 }
 124
 125 TEST(RecursiveASTVisitor, NoRecursionInSelfFriend) {
 126   // From cfe-commits/Week-of-Mon-20100830/033977.html
 127   NamedDeclVisitor Visitor;
 128   Visitor.ExpectMatch("vector_iterator<int>", 2, 7);
 129   EXPECT_TRUE(Visitor.runOver(
 130     "template<typename Container>\n"
 131     "class vector_iterator {\n"
 132     "    template <typename C> friend class vector_iterator;\n"
 133     "};\n"
 134     "vector_iterator<int> it_int;\n"));
 135 }
 136
 137 } // end anonymous namespace