llvm-project/clang/unittests/ASTMatchers/Dynamic/RegistryTest.cpp

//===- unittest/ASTMatchers/Dynamic/RegistryTest.cpp - Registry unit tests -===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===-----------------------------------------------------------------------===//

#include <vector>

#include "../ASTMatchersTest.h"
#include "clang/ASTMatchers/Dynamic/Registry.h"
#include "gtest/gtest.h"

namespace clang {
namespace ast_matchers {
namespace dynamic {
namespace {

using ast_matchers::internal::Matcher;

class RegistryTest : public ::testing::Test {
public:
  std::vector<ParserValue> Args() { return std::vector<ParserValue>(); }
  std::vector<ParserValue> Args(const VariantValue &Arg1) {
    std::vector<ParserValue> Out(1);
    Out[0].Value = Arg1;
    return Out;
  }
  std::vector<ParserValue> Args(const VariantValue &Arg1,
                                const VariantValue &Arg2) {
    std::vector<ParserValue> Out(2);
    Out[0].Value = Arg1;
    Out[1].Value = Arg2;
    return Out;
  }

  VariantMatcher constructMatcher(StringRef MatcherName,
                                  Diagnostics *Error = NULL) {
    Diagnostics DummyError;
    if (!Error) Error = &DummyError;
    const VariantMatcher Out =
        Registry::constructMatcher(MatcherName, SourceRange(), Args(), Error);
    EXPECT_EQ("", DummyError.toStringFull());
    return Out;
  }

  VariantMatcher constructMatcher(StringRef MatcherName,
                                  const VariantValue &Arg1,
                                  Diagnostics *Error = NULL) {
    Diagnostics DummyError;
    if (!Error) Error = &DummyError;
    const VariantMatcher Out = Registry::constructMatcher(
        MatcherName, SourceRange(), Args(Arg1), Error);
    EXPECT_EQ("", DummyError.toStringFull());
    return Out;
  }

  VariantMatcher constructMatcher(StringRef MatcherName,
                                  const VariantValue &Arg1,
                                  const VariantValue &Arg2,
                                  Diagnostics *Error = NULL) {
    Diagnostics DummyError;
    if (!Error) Error = &DummyError;
    const VariantMatcher Out = Registry::constructMatcher(
        MatcherName, SourceRange(), Args(Arg1, Arg2), Error);
    EXPECT_EQ("", DummyError.toStringFull());
    return Out;
  }
};

TEST_F(RegistryTest, CanConstructNoArgs) {
  Matcher<Stmt> IsArrowValue = constructMatcher(
      "memberExpr", constructMatcher("isArrow")).getTypedMatcher<Stmt>();
  Matcher<Stmt> BoolValue =
      constructMatcher("boolLiteral").getTypedMatcher<Stmt>();

  const std::string ClassSnippet = "struct Foo { int x; };\n"
                                   "Foo *foo = new Foo;\n"
                                   "int i = foo->x;\n";
  const std::string BoolSnippet = "bool Foo = true;\n";

  EXPECT_TRUE(matches(ClassSnippet, IsArrowValue));
  EXPECT_TRUE(matches(BoolSnippet, BoolValue));
  EXPECT_FALSE(matches(ClassSnippet, BoolValue));
  EXPECT_FALSE(matches(BoolSnippet, IsArrowValue));
}

TEST_F(RegistryTest, ConstructWithSimpleArgs) {
  Matcher<Decl> Value = constructMatcher(
      "namedDecl", constructMatcher("hasName", std::string("X")))
      .getTypedMatcher<Decl>();
  EXPECT_TRUE(matches("class X {};", Value));
  EXPECT_FALSE(matches("int x;", Value));

  Value = functionDecl(constructMatcher("parameterCountIs", 2)
                           .getTypedMatcher<FunctionDecl>());
  EXPECT_TRUE(matches("void foo(int,int);", Value));
  EXPECT_FALSE(matches("void foo(int);", Value));
}

TEST_F(RegistryTest, ConstructWithMatcherArgs) {
  Matcher<Decl> HasInitializerSimple = constructMatcher(
      "varDecl", constructMatcher("hasInitializer", constructMatcher("stmt")))
      .getTypedMatcher<Decl>();
  Matcher<Decl> HasInitializerComplex = constructMatcher(
      "varDecl",
      constructMatcher("hasInitializer", constructMatcher("callExpr")))
      .getTypedMatcher<Decl>();

  std::string code = "int i;";
  EXPECT_FALSE(matches(code, HasInitializerSimple));
  EXPECT_FALSE(matches(code, HasInitializerComplex));

  code = "int i = 1;";
  EXPECT_TRUE(matches(code, HasInitializerSimple));
  EXPECT_FALSE(matches(code, HasInitializerComplex));

  code = "int y(); int i = y();";
  EXPECT_TRUE(matches(code, HasInitializerSimple));
  EXPECT_TRUE(matches(code, HasInitializerComplex));

  Matcher<Decl> HasParameter =
      functionDecl(constructMatcher(
          "hasParameter", 1, constructMatcher("hasName", std::string("x")))
                       .getTypedMatcher<FunctionDecl>());
  EXPECT_TRUE(matches("void f(int a, int x);", HasParameter));
  EXPECT_FALSE(matches("void f(int x, int a);", HasParameter));
}

TEST_F(RegistryTest, OverloadedMatchers) {
  Matcher<Stmt> CallExpr0 = constructMatcher(
      "callExpr",
      constructMatcher("callee", constructMatcher("memberExpr",
                                                  constructMatcher("isArrow"))))
      .getTypedMatcher<Stmt>();

  Matcher<Stmt> CallExpr1 = constructMatcher(
      "callExpr",
      constructMatcher(
          "callee",
          constructMatcher("methodDecl",
                           constructMatcher("hasName", std::string("x")))))
      .getTypedMatcher<Stmt>();

  std::string Code = "class Y { public: void x(); }; void z() { Y y; y.x(); }";
  EXPECT_FALSE(matches(Code, CallExpr0));
  EXPECT_TRUE(matches(Code, CallExpr1));

  Code = "class Z { public: void z() { this->z(); } };";
  EXPECT_TRUE(matches(Code, CallExpr0));
  EXPECT_FALSE(matches(Code, CallExpr1));
}

TEST_F(RegistryTest, PolymorphicMatchers) {
  const VariantMatcher IsDefinition = constructMatcher("isDefinition");
  Matcher<Decl> Var =
      constructMatcher("varDecl", IsDefinition).getTypedMatcher<Decl>();
  Matcher<Decl> Class =
      constructMatcher("recordDecl", IsDefinition).getTypedMatcher<Decl>();
  Matcher<Decl> Func =
      constructMatcher("functionDecl", IsDefinition).getTypedMatcher<Decl>();
  EXPECT_TRUE(matches("int a;", Var));
  EXPECT_FALSE(matches("extern int a;", Var));
  EXPECT_TRUE(matches("class A {};", Class));
  EXPECT_FALSE(matches("class A;", Class));
  EXPECT_TRUE(matches("void f(){};", Func));
  EXPECT_FALSE(matches("void f();", Func));

  Matcher<Decl> Anything = constructMatcher("anything").getTypedMatcher<Decl>();
  Matcher<Decl> RecordDecl = constructMatcher(
      "recordDecl", constructMatcher("hasName", std::string("Foo")),
      VariantMatcher::SingleMatcher(Anything)).getTypedMatcher<Decl>();

  EXPECT_TRUE(matches("int Foo;", Anything));
  EXPECT_TRUE(matches("class Foo {};", Anything));
  EXPECT_TRUE(matches("void Foo(){};", Anything));
  EXPECT_FALSE(matches("int Foo;", RecordDecl));
  EXPECT_TRUE(matches("class Foo {};", RecordDecl));
  EXPECT_FALSE(matches("void Foo(){};", RecordDecl));

  Matcher<Stmt> ConstructExpr = constructMatcher(
      "constructExpr",
      constructMatcher(
          "hasDeclaration",
          constructMatcher(
              "methodDecl",
              constructMatcher(
                  "ofClass", constructMatcher("hasName", std::string("Foo"))))))
                                    .getTypedMatcher<Stmt>();
  EXPECT_FALSE(matches("class Foo { public: Foo(); };", ConstructExpr));
  EXPECT_TRUE(
      matches("class Foo { public: Foo(); }; Foo foo = Foo();", ConstructExpr));
}

TEST_F(RegistryTest, TemplateArgument) {
  Matcher<Decl> HasTemplateArgument = constructMatcher(
      "classTemplateSpecializationDecl",
      constructMatcher(
          "hasAnyTemplateArgument",
          constructMatcher("refersToType",
                           constructMatcher("asString", std::string("int")))))
      .getTypedMatcher<Decl>();
  EXPECT_TRUE(matches("template<typename T> class A {}; A<int> a;",
                      HasTemplateArgument));
  EXPECT_FALSE(matches("template<typename T> class A {}; A<char> a;",
                       HasTemplateArgument));
}

TEST_F(RegistryTest, TypeTraversal) {
  Matcher<Type> M = constructMatcher(
      "pointerType",
      constructMatcher("pointee", constructMatcher("isConstQualified"),
                       constructMatcher("isInteger"))).getTypedMatcher<Type>();
  EXPECT_FALSE(matches("int *a;", M));
  EXPECT_TRUE(matches("int const *b;", M));

  M = constructMatcher(
      "arrayType",
      constructMatcher("hasElementType", constructMatcher("builtinType")))
      .getTypedMatcher<Type>();
  EXPECT_FALSE(matches("struct A{}; A a[7];;", M));
  EXPECT_TRUE(matches("int b[7];", M));
}

TEST_F(RegistryTest, CXXCtorInitializer) {
  Matcher<Decl> CtorDecl = constructMatcher(
      "constructorDecl",
      constructMatcher(
          "hasAnyConstructorInitializer",
          constructMatcher("forField",
                           constructMatcher("hasName", std::string("foo")))))
      .getTypedMatcher<Decl>();
  EXPECT_TRUE(matches("struct Foo { Foo() : foo(1) {} int foo; };", CtorDecl));
  EXPECT_FALSE(matches("struct Foo { Foo() {} int foo; };", CtorDecl));
  EXPECT_FALSE(matches("struct Foo { Foo() : bar(1) {} int bar; };", CtorDecl));
}

TEST_F(RegistryTest, Adaptative) {
  Matcher<Decl> D = constructMatcher(
      "recordDecl",
      constructMatcher(
          "has",
          constructMatcher("recordDecl",
                           constructMatcher("hasName", std::string("X")))))
      .getTypedMatcher<Decl>();
  EXPECT_TRUE(matches("class X {};", D));
  EXPECT_TRUE(matches("class Y { class X {}; };", D));
  EXPECT_FALSE(matches("class Y { class Z {}; };", D));

  Matcher<Stmt> S = constructMatcher(
      "forStmt",
      constructMatcher(
          "hasDescendant",
          constructMatcher("varDecl",
                           constructMatcher("hasName", std::string("X")))))
      .getTypedMatcher<Stmt>();
  EXPECT_TRUE(matches("void foo() { for(int X;;); }", S));
  EXPECT_TRUE(matches("void foo() { for(;;) { int X; } }", S));
  EXPECT_FALSE(matches("void foo() { for(;;); }", S));
  EXPECT_FALSE(matches("void foo() { if (int X = 0){} }", S));

  S = constructMatcher(
      "compoundStmt", constructMatcher("hasParent", constructMatcher("ifStmt")))
      .getTypedMatcher<Stmt>();
  EXPECT_TRUE(matches("void foo() { if (true) { int x = 42; } }", S));
  EXPECT_FALSE(matches("void foo() { if (true) return; }", S));
}

TEST_F(RegistryTest, VariadicOp) {
  Matcher<Decl> D = constructMatcher(
      "anyOf",
      constructMatcher("recordDecl",
                       constructMatcher("hasName", std::string("Foo"))),
      constructMatcher("namedDecl",
                       constructMatcher("hasName", std::string("foo"))))
      .getTypedMatcher<Decl>();

  EXPECT_TRUE(matches("void foo(){}", D));
  EXPECT_TRUE(matches("struct Foo{};", D));
  EXPECT_FALSE(matches("int i = 0;", D));

  D = constructMatcher(
      "allOf", constructMatcher("recordDecl"),
      constructMatcher(
          "namedDecl",
          constructMatcher("anyOf",
                           constructMatcher("hasName", std::string("Foo")),
                           constructMatcher("hasName", std::string("Bar")))))
      .getTypedMatcher<Decl>();

  EXPECT_FALSE(matches("void foo(){}", D));
  EXPECT_TRUE(matches("struct Foo{};", D));
  EXPECT_FALSE(matches("int i = 0;", D));
  EXPECT_TRUE(matches("class Bar{};", D));
  EXPECT_FALSE(matches("class OtherBar{};", D));

  D = constructMatcher(
      "recordDecl",
      constructMatcher(
          "unless",
          constructMatcher("namedDecl",
                           constructMatcher("hasName", std::string("Bar")))))
          .getTypedMatcher<Decl>();

  EXPECT_FALSE(matches("class Bar{};", D));
  EXPECT_TRUE(matches("class OtherBar{};", D));
}

TEST_F(RegistryTest, Errors) {
  // Incorrect argument count.
  OwningPtr<Diagnostics> Error(new Diagnostics());
  EXPECT_TRUE(constructMatcher("hasInitializer", Error.get()).isNull());
  EXPECT_EQ("Incorrect argument count. (Expected = 1) != (Actual = 0)",
            Error->toString());
  Error.reset(new Diagnostics());
  EXPECT_TRUE(constructMatcher("isArrow", std::string(), Error.get()).isNull());
  EXPECT_EQ("Incorrect argument count. (Expected = 0) != (Actual = 1)",
            Error->toString());
  Error.reset(new Diagnostics());
  EXPECT_TRUE(constructMatcher("anyOf", Error.get()).isNull());
  EXPECT_EQ("Incorrect argument count. (Expected = (2, )) != (Actual = 0)",
            Error->toString());
  Error.reset(new Diagnostics());
  EXPECT_TRUE(constructMatcher("unless", std::string(), std::string(),
                               Error.get()).isNull());
  EXPECT_EQ("Incorrect argument count. (Expected = (1, 1)) != (Actual = 2)",
            Error->toString());

  // Bad argument type
  Error.reset(new Diagnostics());
  EXPECT_TRUE(constructMatcher("ofClass", std::string(), Error.get()).isNull());
  EXPECT_EQ("Incorrect type for arg 1. (Expected = Matcher<CXXRecordDecl>) != "
            "(Actual = String)",
            Error->toString());
  Error.reset(new Diagnostics());
  EXPECT_TRUE(constructMatcher("recordDecl", constructMatcher("recordDecl"),
                               constructMatcher("parameterCountIs", 3),
                               Error.get()).isNull());
  EXPECT_EQ("Incorrect type for arg 2. (Expected = Matcher<CXXRecordDecl>) != "
            "(Actual = Matcher<FunctionDecl>)",
            Error->toString());

  // Bad argument type with variadic.
  Error.reset(new Diagnostics());
  EXPECT_TRUE(constructMatcher("anyOf", std::string(), std::string(),
                               Error.get()).isNull());
  EXPECT_EQ(
      "Incorrect type for arg 1. (Expected = Matcher<>) != (Actual = String)",
      Error->toString());
  Error.reset(new Diagnostics());
  EXPECT_TRUE(constructMatcher(
      "recordDecl",
      constructMatcher("allOf",
                       constructMatcher("isDerivedFrom", std::string("FOO")),
                       constructMatcher("isArrow")),
      Error.get()).isNull());
  EXPECT_EQ("Incorrect type for arg 1. "
            "(Expected = Matcher<CXXRecordDecl>) != "
            "(Actual = Matcher<CXXRecordDecl>&Matcher<MemberExpr>)",
            Error->toString());
}

} // end anonymous namespace
} // end namespace dynamic
} // end namespace ast_matchers
} // end namespace clang