Clang Project

clang_source_code/unittests/Tooling/RecursiveASTVisitorTests/ImplicitCtor.cpp
1//===- unittest/Tooling/RecursiveASTVisitorTests/ImplicitCtor.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
11using namespace clang;
12
13namespace {
14
15// A visitor that visits implicit declarations and matches constructors.
16class ImplicitCtorVisitor
17    : public ExpectedLocationVisitor<ImplicitCtorVisitor> {
18public:
19  bool shouldVisitImplicitCode() const { return true; }
20
21  bool VisitCXXConstructorDecl(CXXConstructorDecl* Ctor) {
22    if (Ctor->isImplicit()) {  // Was not written in source code
23      if (const CXXRecordDecl* Class = Ctor->getParent()) {
24        Match(Class->getName(), Ctor->getLocation());
25      }
26    }
27    return true;
28  }
29};
30
31TEST(RecursiveASTVisitor, VisitsImplicitCopyConstructors) {
32  ImplicitCtorVisitor Visitor;
33  Visitor.ExpectMatch("Simple", 2, 8);
34  // Note: Clang lazily instantiates implicit declarations, so we need
35  // to use them in order to force them to appear in the AST.
36  EXPECT_TRUE(Visitor.runOver(
37      "struct WithCtor { WithCtor(); }; \n"
38      "struct Simple { Simple(); WithCtor w; }; \n"
39      "int main() { Simple s; Simple t(s); }\n"));
40}
41
42} // end anonymous namespace
43
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