/*
 * Copyright 2014  Milian Wolff <mail@milianw.de>
 * Copyright 2014  Kevin Funk <kfunk@kde.org>
 * Copyright 2015  Sergey Kalinichev <kalinichev.so.0@gmail.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License or (at your option) version 3 or any later version
 * accepted by the membership of KDE e.V. (or its successor approved
 * by the membership of KDE e.V.), which shall act as a proxy
 * defined in Section 14 of version 3 of the license.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "test_duchain.h"

#include <tests/testcore.h>
#include <tests/autotestshell.h>
#include <tests/testfile.h>
#include <tests/testproject.h>
#include <language/duchain/duchainlock.h>
#include <language/duchain/duchain.h>
#include <language/duchain/declaration.h>
#include <language/duchain/parsingenvironment.h>
#include <language/duchain/problem.h>
#include <language/duchain/types/integraltype.h>
#include <language/duchain/types/structuretype.h>
#include <language/duchain/types/functiontype.h>
#include <language/duchain/types/typealiastype.h>
#include <language/duchain/duchainutils.h>
#include <language/duchain/classdeclaration.h>
#include <language/duchain/abstractfunctiondeclaration.h>
#include <language/duchain/functiondefinition.h>
#include <language/duchain/classfunctiondeclaration.h>
#include <language/duchain/forwarddeclaration.h>
#include <language/duchain/use.h>
#include <language/duchain/duchaindumper.h>
#include <language/backgroundparser/backgroundparser.h>
#include <interfaces/ilanguagecontroller.h>
#include <interfaces/idocumentcontroller.h>
#include <util/kdevstringhandler.h>

#include "duchain/clangparsingenvironmentfile.h"
#include "duchain/clangparsingenvironment.h"
#include "duchain/parsesession.h"

#include <languages/plugins/custom-definesandincludes/idefinesandincludesmanager.h>

#include <QtTest>

QTEST_MAIN(TestDUChain);

using namespace KDevelop;

class TestEnvironmentProvider final : public IDefinesAndIncludesManager::BackgroundProvider
{
public:
    ~TestEnvironmentProvider() override = default;
    QHash< QString, QString > definesInBackground(const QString& /*path*/) const override
    {
        return defines;
    }

    Path::List includesInBackground(const QString& /*path*/) const override
    {
        return includes;
    }

    IDefinesAndIncludesManager::Type type() const override
    {
        return IDefinesAndIncludesManager::UserDefined;
    }

    QHash<QString, QString> defines;
    Path::List includes;
};

TestDUChain::~TestDUChain() = default;

void TestDUChain::initTestCase()
{
    QLoggingCategory::setFilterRules(QStringLiteral("*.debug=false\ndefault.debug=true\nkdevelop.plugins.clang.debug=true\n"));
    QVERIFY(qputenv("KDEV_DISABLE_PLUGINS", "kdevcppsupport"));
    QVERIFY(qputenv("KDEV_CLANG_DISPLAY_DIAGS", "1"));
    AutoTestShell::init({QStringLiteral("kdevclangsupport")});
    auto core = TestCore::initialize();
    delete core->projectController();
    m_projectController = new TestProjectController(core);
    core->setProjectController(m_projectController);
}

void TestDUChain::cleanupTestCase()
{
    TestCore::shutdown();
}

void TestDUChain::cleanup()
{
    if (m_provider) {
        IDefinesAndIncludesManager::manager()->unregisterBackgroundProvider(m_provider.data());
    }
}

void TestDUChain::init()
{
    m_provider.reset(new TestEnvironmentProvider);
    IDefinesAndIncludesManager::manager()->registerBackgroundProvider(m_provider.data());
}

struct ExpectedComment
{
    QString identifier;
    QString comment;
};
Q_DECLARE_METATYPE(ExpectedComment)
Q_DECLARE_METATYPE(AbstractType::WhichType)

void TestDUChain::testComments()
{
    QFETCH(QString, code);
    QFETCH(ExpectedComment, expectedComment);

    TestFile file(code, "cpp");
    QVERIFY(file.parseAndWait());

    DUChainReadLocker lock;
    auto top = file.topContext();
    QVERIFY(top);
    auto candidates = top->findDeclarations(QualifiedIdentifier(expectedComment.identifier));
    QVERIFY(!candidates.isEmpty());
    auto decl = candidates.first();
    QString comment = QString::fromLocal8Bit(decl->comment());
    comment = KDevelop::htmlToPlainText(comment, KDevelop::CompleteMode);
    QCOMPARE(comment, expectedComment.comment);
}

void TestDUChain::testComments_data()
{
    QTest::addColumn<QString>("code");
    QTest::addColumn<ExpectedComment>("expectedComment");

    // note: Clang only retrieves the comments when in doxygen-style format (i.e. '///', '/**', '///<')
    QTest::newRow("invalid1")
        << "//this is foo\nint foo;"
        << ExpectedComment{"foo", QString()};
    QTest::newRow("invalid2")
        << "/*this is foo*/\nint foo;"
        << ExpectedComment{"foo", QString()};
    QTest::newRow("basic1")
        << "///this is foo\nint foo;"
        << ExpectedComment{"foo", "this is foo"};
    QTest::newRow("basic2")
        << "/**this is foo*/\nint foo;"
        << ExpectedComment{"foo", "this is foo"};
    QTest::newRow("enumerator")
        << "enum Foo { bar1, ///<this is bar1\nbar2 ///<this is bar2\n };"
        << ExpectedComment{"Foo::bar1", "this is bar1"};
    QTest::newRow("comment-formatting")
        << "/** a\n * multiline\n *\n * comment\n */ int foo;"
        << ExpectedComment{"foo", "a multiline\ncomment"};
    QTest::newRow("comment-doxygen-tags")
        << "/** @see bar()\n@param a foo\n*/\nvoid foo(int a);\nvoid bar();"
        << ExpectedComment{"foo", "bar()\na\nfoo"};
}

void TestDUChain::testElaboratedType()
{
    QFETCH(QString, code);
    QFETCH(AbstractType::WhichType, type);

    TestFile file(code, "cpp");
    QVERIFY(file.parseAndWait());

    DUChainReadLocker lock;
    auto top = file.topContext();
    QVERIFY(top);
    QCOMPARE(file.topContext()->localDeclarations().size(), 2);

    auto decl = file.topContext()->localDeclarations()[1];
    QVERIFY(decl);

    auto function = dynamic_cast<FunctionDeclaration*>(decl);
    QVERIFY(function);

    auto functionType = function->type<FunctionType>();
    QVERIFY(functionType);

#if CINDEX_VERSION_MINOR < 34
    QEXPECT_FAIL("namespace", "The ElaboratedType is not exposed through the libclang interface, not much we can do here", Abort);
#endif
    QVERIFY(functionType->returnType()->whichType() != AbstractType::TypeDelayed);
#if CINDEX_VERSION_MINOR < 34
    QEXPECT_FAIL("typedef", "After using clang_getCanonicalType on ElaboratedType all typedef information get's stripped away", Continue);
#endif
    QCOMPARE(functionType->returnType()->whichType(), type);
}

void TestDUChain::testElaboratedType_data()
{
    QTest::addColumn<QString>("code");
    QTest::addColumn<AbstractType::WhichType>("type");

    QTest::newRow("namespace")
        << "namespace NS{struct Type{};} struct NS::Type foo();"
        << AbstractType::TypeStructure;
    QTest::newRow("enum")
        << "enum Enum{}; enum Enum foo();"
        << AbstractType::TypeEnumeration;
    QTest::newRow("typedef")
        << "namespace NS{typedef int type;} NS::type foo();"
        << AbstractType::TypeAlias;
}

void TestDUChain::testInclude()
{
    TestFile header("int foo() { return 42; }\n", "h");
    // NOTE: header is _not_ explictly being parsed, instead the impl job does that

    TestFile impl("#include \"" + header.url().byteArray() + "\"\n"
                  "int main() { return foo(); }", "cpp", &header);
    impl.parse(TopDUContext::AllDeclarationsContextsAndUses);

    auto implCtx = impl.topContext();
    QVERIFY(implCtx);

    DUChainReadLocker lock;
    QCOMPARE(implCtx->localDeclarations().size(), 1);

    auto headerCtx = DUChain::self()->chainForDocument(header.url());
    QVERIFY(headerCtx);
    QVERIFY(!headerCtx->parsingEnvironmentFile()->needsUpdate());
    QCOMPARE(headerCtx->localDeclarations().size(), 1);

    QVERIFY(implCtx->imports(headerCtx, CursorInRevision(0, 10)));

    Declaration* foo = headerCtx->localDeclarations().first();
    QCOMPARE(foo->uses().size(), 1);
    QCOMPARE(foo->uses().begin().key(), impl.url());
    QCOMPARE(foo->uses().begin()->size(), 1);
    QCOMPARE(foo->uses().begin()->first(), RangeInRevision(1, 20, 1, 23));
}

void TestDUChain::testMissingInclude()
{
    auto code = R"(
#pragma once
#include "missing1.h"

template<class T>
class A
{
    T a;
};

#include "missing2.h"

class B : public A<int>
{
};
    )";

    // NOTE: This fails and needs fixing. If the include of "missing2.h"
    //       above is commented out, then it doesn't fail. Maybe
    //       clang stops processing when it encounters the second missing
    //       header, or similar.

    TestFile header(code, "h");
    TestFile impl("#include \"" + header.url().byteArray() + "\"\n", "cpp", &header);
    QVERIFY(impl.parseAndWait(TopDUContext::AllDeclarationsContextsAndUses));

    DUChainReadLocker lock;

    auto top = impl.topContext();
    QVERIFY(top);

    QCOMPARE(top->importedParentContexts().count(), 1);

    TopDUContext* headerCtx = dynamic_cast<TopDUContext*>(top->importedParentContexts().first().context(top));
    QVERIFY(headerCtx);
    QCOMPARE(headerCtx->url(), header.url());

#if CINDEX_VERSION_MINOR < 34
    QEXPECT_FAIL("", "Second missing header isn't reported", Continue);
#endif
    QCOMPARE(headerCtx->problems().count(), 2);

    QCOMPARE(headerCtx->localDeclarations().count(), 2);

    auto a = dynamic_cast<ClassDeclaration*>(headerCtx->localDeclarations().first());
    QVERIFY(a);

    auto b = dynamic_cast<ClassDeclaration*>(headerCtx->localDeclarations().last());
    QVERIFY(b);

#if CINDEX_VERSION_MINOR < 34
    QEXPECT_FAIL("", "Base class isn't assigned correctly", Continue);
#endif
    QCOMPARE(b->baseClassesSize(), 1u);

#if CINDEX_VERSION_MINOR < 34
    // at least the one problem we have should have been propagated
    QCOMPARE(top->problems().count(), 1);
#else
    // two errors:
    // /tmp/testfile_f32415.h:3:10: error: 'missing1.h' file not found
    // /tmp/testfile_f32415.h:11:10: error: 'missing2.h' file not found
    QCOMPARE(top->problems().count(), 2);
#endif
}

QByteArray createCode(const QByteArray& prefix, const int functions)
{
    QByteArray code;
    code += "#ifndef " + prefix + "_H\n";
    code += "#define " + prefix + "_H\n";
    for (int i = 0; i < functions; ++i) {
        code += "void myFunc_" + prefix + "(int arg1, char arg2, const char* arg3);\n";
    }
    code += "#endif\n";
    return code;
}

void TestDUChain::testIncludeLocking()
{
    TestFile header1(createCode("Header1", 1000), "h");
    TestFile header2(createCode("Header2", 1000), "h");
    TestFile header3(createCode("Header3", 1000), "h");

    ICore::self()->languageController()->backgroundParser()->setThreadCount(3);

    TestFile impl1("#include \"" + header1.url().byteArray() + "\"\n"
                   "#include \"" + header2.url().byteArray() + "\"\n"
                   "#include \"" + header3.url().byteArray() + "\"\n"
                   "int main() { return 0; }", "cpp");

    TestFile impl2("#include \"" + header2.url().byteArray() + "\"\n"
                   "#include \"" + header1.url().byteArray() + "\"\n"
                   "#include \"" + header3.url().byteArray() + "\"\n"
                   "int main() { return 0; }", "cpp");

    TestFile impl3("#include \"" + header3.url().byteArray() + "\"\n"
                   "#include \"" + header1.url().byteArray() + "\"\n"
                   "#include \"" + header2.url().byteArray() + "\"\n"
                   "int main() { return 0; }", "cpp");

    impl1.parse(TopDUContext::AllDeclarationsContextsAndUses);
    impl2.parse(TopDUContext::AllDeclarationsContextsAndUses);
    impl3.parse(TopDUContext::AllDeclarationsContextsAndUses);

    QVERIFY(impl1.waitForParsed(5000));
    QVERIFY(impl2.waitForParsed(5000));
    QVERIFY(impl3.waitForParsed(5000));

    DUChainReadLocker lock;
    QVERIFY(DUChain::self()->chainForDocument(header1.url()));
    QVERIFY(DUChain::self()->chainForDocument(header2.url()));
    QVERIFY(DUChain::self()->chainForDocument(header3.url()));
}

void TestDUChain::testReparse()
{
    TestFile file("int main() { int i = 42; return i; }", "cpp");
    file.parse(TopDUContext::AllDeclarationsContextsAndUses);

    DeclarationPointer mainDecl;
    DeclarationPointer iDecl;
    for (int i = 0; i < 3; ++i) {
        QVERIFY(file.waitForParsed(500));
        DUChainReadLocker lock;
        QVERIFY(file.topContext());
        QCOMPARE(file.topContext()->childContexts().size(), 1);
        QCOMPARE(file.topContext()->localDeclarations().size(), 1);
        DUContext *exprContext = file.topContext()->childContexts().first()->childContexts().first();
        QCOMPARE(exprContext->localDeclarations().size(), 1);

        if (i) {
            QVERIFY(mainDecl);
            QCOMPARE(mainDecl.data(), file.topContext()->localDeclarations().first());

            QVERIFY(iDecl);
            QCOMPARE(iDecl.data(), exprContext->localDeclarations().first());
        }
        mainDecl = file.topContext()->localDeclarations().first();
        iDecl = exprContext->localDeclarations().first();

        QVERIFY(mainDecl->uses().isEmpty());
        QCOMPARE(iDecl->uses().size(), 1);
        QCOMPARE(iDecl->uses().begin()->size(), 1);

        if (i == 1) {
            file.setFileContents("int main()\n{\nfloat i = 13; return i - 5;\n}\n");
        }

        file.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses | TopDUContext::ForceUpdateRecursive));
    }
}

void TestDUChain::testReparseError()
{
    TestFile file("int i = 1 / 0;\n", "cpp");
    file.parse(TopDUContext::AllDeclarationsContextsAndUses);

    for (int i = 0; i < 2; ++i) {
        QVERIFY(file.waitForParsed(500));
        DUChainReadLocker lock;
        QVERIFY(file.topContext());
        if (!i) {
            QCOMPARE(file.topContext()->problems().size(), 1);
            file.setFileContents("int i = 0;\n");
        } else {
            QCOMPARE(file.topContext()->problems().size(), 0);
        }

        file.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses | TopDUContext::ForceUpdateRecursive));
    }
}

void TestDUChain::testTemplate()
{
    TestFile file("template<typename T> struct foo { T bar; };\n"
                  "int main() { foo<int> myFoo; return myFoo.bar; }\n", "cpp");
    QVERIFY(file.parseAndWait());

    DUChainReadLocker lock;
    QVERIFY(file.topContext());
    QCOMPARE(file.topContext()->localDeclarations().size(), 2);
    auto fooDecl = file.topContext()->localDeclarations().first();
    QVERIFY(fooDecl->internalContext());
    QCOMPARE(fooDecl->internalContext()->localDeclarations().size(), 2);

    QCOMPARE(file.topContext()->findDeclarations(QualifiedIdentifier("foo< T >")).size(), 1);
    QCOMPARE(file.topContext()->findDeclarations(QualifiedIdentifier("foo< T >::bar")).size(), 1);

    auto mainCtx = file.topContext()->localDeclarations().last()->internalContext()->childContexts().first();
    QVERIFY(mainCtx);
    auto myFoo = mainCtx->localDeclarations().first();
    QVERIFY(myFoo);
    QCOMPARE(myFoo->abstractType()->toString().remove(' '), QStringLiteral("foo<int>"));
}

void TestDUChain::testNamespace()
{
    TestFile file("namespace foo { struct bar { int baz; }; }\n"
                  "int main() { foo::bar myBar; }\n", "cpp");
    QVERIFY(file.parseAndWait());

    DUChainReadLocker lock;
    QVERIFY(file.topContext());
    QCOMPARE(file.topContext()->localDeclarations().size(), 2);
    auto fooDecl = file.topContext()->localDeclarations().first();
    QVERIFY(fooDecl->internalContext());
    QCOMPARE(fooDecl->internalContext()->localDeclarations().size(), 1);

    DUContext* top = file.topContext().data();
    DUContext* mainCtx = file.topContext()->childContexts().last();

    auto foo = top->localDeclarations().first();
    QCOMPARE(foo->qualifiedIdentifier().toString(), QString("foo"));

    DUContext* fooCtx = file.topContext()->childContexts().first();
    QCOMPARE(fooCtx->localScopeIdentifier().toString(), QString("foo"));
    QCOMPARE(fooCtx->scopeIdentifier(true).toString(), QString("foo"));
    QCOMPARE(fooCtx->localDeclarations().size(), 1);
    auto bar = fooCtx->localDeclarations().first();
    QCOMPARE(bar->qualifiedIdentifier().toString(), QString("foo::bar"));
    QCOMPARE(fooCtx->childContexts().size(), 1);

    DUContext* barCtx = fooCtx->childContexts().first();
    QCOMPARE(barCtx->localScopeIdentifier().toString(), QString("bar"));
    QCOMPARE(barCtx->scopeIdentifier(true).toString(), QString("foo::bar"));
    QCOMPARE(barCtx->localDeclarations().size(), 1);
    auto baz = barCtx->localDeclarations().first();
    QCOMPARE(baz->qualifiedIdentifier().toString(), QString("foo::bar::baz"));

    for (auto ctx : {top, mainCtx}) {
        QCOMPARE(ctx->findDeclarations(QualifiedIdentifier("foo")).size(), 1);
        QCOMPARE(ctx->findDeclarations(QualifiedIdentifier("foo::bar")).size(), 1);
        QCOMPARE(ctx->findDeclarations(QualifiedIdentifier("foo::bar::baz")).size(), 1);
    }
}

void TestDUChain::testAutoTypeDeduction()
{
    TestFile file(R"(
        const volatile auto foo = 5;
        template<class T> struct myTemplate {};
        myTemplate<myTemplate<int>& > templRefParam;
        auto autoTemplRefParam = templRefParam;
    )", "cpp");
    QVERIFY(file.parseAndWait());

    DUChainReadLocker lock;

    DUContext* ctx = file.topContext().data();
    QVERIFY(ctx);
    QCOMPARE(ctx->localDeclarations().size(), 4);
    QCOMPARE(ctx->findDeclarations(QualifiedIdentifier("foo")).size(), 1);
    Declaration* decl = ctx->findDeclarations(QualifiedIdentifier("foo"))[0];
    QCOMPARE(decl->identifier(), Identifier("foo"));
#if CINDEX_VERSION_MINOR < 31
    QEXPECT_FAIL("", "No type deduction here unfortunately, missing API in Clang", Continue);
#endif
    QVERIFY(decl->type<IntegralType>());
#if CINDEX_VERSION_MINOR < 31
    QCOMPARE(decl->toString(), QStringLiteral("const volatile auto foo"));
#else
    QCOMPARE(decl->toString(), QStringLiteral("const volatile int foo"));
#endif

    decl = ctx->findDeclarations(QualifiedIdentifier("autoTemplRefParam"))[0];
    QVERIFY(decl);
    QVERIFY(decl->abstractType());
#if CINDEX_VERSION_MINOR < 31
    QEXPECT_FAIL("", "Auto type is not exposed via LibClang", Continue);
#endif
    QCOMPARE(decl->abstractType()->toString(), QStringLiteral("myTemplate< myTemplate< int >& >"));
}

void TestDUChain::testTypeDeductionInTemplateInstantiation()
{
    // see: http://clang-developers.42468.n3.nabble.com/RFC-missing-libclang-query-functions-features-td2504253.html
    TestFile file("template<typename T> struct foo { T member; } foo<int> f; auto i = f.member;", "cpp");
    QVERIFY(file.parseAndWait());

    DUChainReadLocker lock;

    DUContext* ctx = file.topContext().data();
    QVERIFY(ctx);
    QCOMPARE(ctx->localDeclarations().size(), 3);
    Declaration* decl = 0;

    // check 'foo' declaration
    decl = ctx->localDeclarations()[0];
    QVERIFY(decl);
    QCOMPARE(decl->identifier(), Identifier("foo< T >"));

    // check type of 'member' inside declaration-scope
    QCOMPARE(ctx->childContexts().size(), 1);
    DUContext* fooCtx = ctx->childContexts().first();
    QVERIFY(fooCtx);
    // Should there really be two declarations?
    QCOMPARE(fooCtx->localDeclarations().size(), 2);
    decl = fooCtx->localDeclarations()[1];
    QCOMPARE(decl->identifier(), Identifier("member"));

    // check type of 'member' in definition of 'f'
    decl = ctx->localDeclarations()[1];
    QCOMPARE(decl->identifier(), Identifier("f"));
    decl = ctx->localDeclarations()[2];
    QCOMPARE(decl->identifier(), Identifier("i"));
#if CINDEX_VERSION_MINOR < 31
    QEXPECT_FAIL("", "No type deduction here unfortunately, missing API in Clang", Continue);
#endif
    QVERIFY(decl->type<IntegralType>());
}

void TestDUChain::testVirtualMemberFunction()
{
    //Forward-declarations with "struct" or "class" are considered equal, so make sure the override is detected correctly.
    TestFile file("struct S {}; struct A { virtual S* ret(); }; struct B : public A { virtual S* ret(); };", "cpp");
    QVERIFY(file.parseAndWait());

    DUChainReadLocker lock;
    DUContext* top = file.topContext().data();
    QVERIFY(top);

    QCOMPARE(top->childContexts().count(), 3);
    QCOMPARE(top->localDeclarations().count(), 3);
    QCOMPARE(top->childContexts()[2]->localDeclarations().count(), 1);
    Declaration* decl = top->childContexts()[2]->localDeclarations()[0];
    QCOMPARE(decl->identifier(), Identifier("ret"));
    QVERIFY(DUChainUtils::getOverridden(decl));
}

void TestDUChain::testBaseClasses()
{
    TestFile file("class Base {}; class Inherited : public Base {};", "cpp");
    QVERIFY(file.parseAndWait());

    DUChainReadLocker lock;
    DUContext* top = file.topContext().data();
    QVERIFY(top);

    QCOMPARE(top->localDeclarations().count(), 2);
    Declaration* baseDecl = top->localDeclarations().first();
    QCOMPARE(baseDecl->identifier(), Identifier("Base"));

    ClassDeclaration* inheritedDecl = dynamic_cast<ClassDeclaration*>(top->localDeclarations()[1]);
    QCOMPARE(inheritedDecl->identifier(), Identifier("Inherited"));

    QVERIFY(inheritedDecl);
    QCOMPARE(inheritedDecl->baseClassesSize(), 1u);

    QCOMPARE(baseDecl->uses().count(), 1);
    QCOMPARE(baseDecl->uses().first().count(), 1);
    QCOMPARE(baseDecl->uses().first().first(), RangeInRevision(0, 40, 0, 44));
}

void TestDUChain::testReparseBaseClasses()
{
    TestFile file("struct a{}; struct b : a {};\n", "cpp");
    file.parse(TopDUContext::AllDeclarationsContextsAndUses);

    for (int i = 0; i < 2; ++i) {
        qDebug() << "run: " << i;
        QVERIFY(file.waitForParsed(500));
        DUChainWriteLocker lock;
        QVERIFY(file.topContext());
        QCOMPARE(file.topContext()->childContexts().size(), 2);
        QCOMPARE(file.topContext()->childContexts().first()->importers().size(), 1);
        QCOMPARE(file.topContext()->childContexts().last()->importedParentContexts().size(), 1);

        QCOMPARE(file.topContext()->localDeclarations().size(), 2);
        auto aDecl = dynamic_cast<ClassDeclaration*>(file.topContext()->localDeclarations().first());
        QVERIFY(aDecl);
        QCOMPARE(aDecl->baseClassesSize(), 0u);
        auto bDecl = dynamic_cast<ClassDeclaration*>(file.topContext()->localDeclarations().last());
        QVERIFY(bDecl);
        QCOMPARE(bDecl->baseClassesSize(), 1u);
        int distance = 0;
        QVERIFY(bDecl->isPublicBaseClass(aDecl, file.topContext(), &distance));
        QCOMPARE(distance, 1);

        file.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses | TopDUContext::ForceUpdateRecursive));
    }
}

void TestDUChain::testReparseBaseClassesTemplates()
{
    TestFile file("template<typename T> struct a{}; struct b : a<int> {};\n", "cpp");
    file.parse(TopDUContext::AllDeclarationsContextsAndUses);

    for (int i = 0; i < 2; ++i) {
        qDebug() << "run: " << i;
        QVERIFY(file.waitForParsed(500));
        DUChainWriteLocker lock;
        QVERIFY(file.topContext());
        QCOMPARE(file.topContext()->childContexts().size(), 2);
        QCOMPARE(file.topContext()->childContexts().first()->importers().size(), 1);
        QCOMPARE(file.topContext()->childContexts().last()->importedParentContexts().size(), 1);

        QCOMPARE(file.topContext()->localDeclarations().size(), 2);
        auto aDecl = dynamic_cast<ClassDeclaration*>(file.topContext()->localDeclarations().first());
        QVERIFY(aDecl);
        QCOMPARE(aDecl->baseClassesSize(), 0u);
        auto bDecl = dynamic_cast<ClassDeclaration*>(file.topContext()->localDeclarations().last());
        QVERIFY(bDecl);
        QCOMPARE(bDecl->baseClassesSize(), 1u);
        int distance = 0;
        QVERIFY(bDecl->isPublicBaseClass(aDecl, file.topContext(), &distance));
        QCOMPARE(distance, 1);

        file.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses | TopDUContext::ForceUpdateRecursive));
    }
}

void TestDUChain::testGetInheriters_data()
{
    QTest::addColumn<QString>("code");

    QTest::newRow("inline") << "struct Base { struct Inner {}; }; struct Inherited : Base, Base::Inner {};";
    QTest::newRow("outline") << "struct Base { struct Inner; }; struct Base::Inner {}; struct Inherited : Base, Base::Inner {};";
}

void TestDUChain::testGetInheriters()
{
    QFETCH(QString, code);
    TestFile file(code, "cpp");
    QVERIFY(file.parseAndWait());

    DUChainReadLocker lock;
    auto top = file.topContext();
    QVERIFY(top);
    QVERIFY(top->problems().isEmpty());

    QCOMPARE(top->localDeclarations().count(), 2);
    Declaration* baseDecl = top->localDeclarations().first();
    QCOMPARE(baseDecl->identifier(), Identifier("Base"));

    DUContext* baseCtx = baseDecl->internalContext();
    QVERIFY(baseCtx);
    QCOMPARE(baseCtx->localDeclarations().count(), 1);

    Declaration* innerDecl = baseCtx->localDeclarations().first();
    QCOMPARE(innerDecl->identifier(), Identifier("Inner"));
    if (auto forward = dynamic_cast<ForwardDeclaration*>(innerDecl)) {
        innerDecl = forward->resolve(top);
    }
    QVERIFY(dynamic_cast<ClassDeclaration*>(innerDecl));

    Declaration* inheritedDecl = top->localDeclarations().last();
    QVERIFY(inheritedDecl);
    QCOMPARE(inheritedDecl->identifier(), Identifier("Inherited"));

    uint maxAllowedSteps = uint(-1);
    auto baseInheriters = DUChainUtils::getInheriters(baseDecl, maxAllowedSteps);
    QCOMPARE(baseInheriters, QList<Declaration*>() << inheritedDecl);

    maxAllowedSteps = uint(-1);
    auto innerInheriters = DUChainUtils::getInheriters(innerDecl, maxAllowedSteps);
    QCOMPARE(innerInheriters, QList<Declaration*>() << inheritedDecl);

    maxAllowedSteps = uint(-1);
    auto inheritedInheriters = DUChainUtils::getInheriters(inheritedDecl, maxAllowedSteps);
    QCOMPARE(inheritedInheriters.count(), 0);
}

void TestDUChain::testGlobalFunctionDeclaration()
{
    TestFile file("void foo(int arg1, char arg2);\n", "cpp");
    file.parse(TopDUContext::AllDeclarationsContextsAndUses);
    file.waitForParsed();

    DUChainReadLocker lock;
    QVERIFY(file.topContext());
    QCOMPARE(file.topContext()->localDeclarations().size(), 1);
    QCOMPARE(file.topContext()->childContexts().size(), 1);
    QVERIFY(!file.topContext()->childContexts().first()->inSymbolTable());
}

void TestDUChain::testFunctionDefinitionVsDeclaration()
{
    TestFile file("void func(); void func() {}\n", "cpp");
    file.parse(TopDUContext::AllDeclarationsContextsAndUses);
    QVERIFY(file.waitForParsed());

    DUChainReadLocker lock;
    QVERIFY(file.topContext());
    QCOMPARE(file.topContext()->localDeclarations().size(), 2);
    auto funcDecl = file.topContext()->localDeclarations()[0];
    QVERIFY(!funcDecl->isDefinition());
    QVERIFY(!dynamic_cast<FunctionDefinition*>(funcDecl));
    auto funcDef = file.topContext()->localDeclarations()[1];
    QVERIFY(dynamic_cast<FunctionDefinition*>(funcDef));
    QVERIFY(funcDef->isDefinition());
}

void TestDUChain::testEnsureNoDoubleVisit()
{
    // On some language construct, we may up visiting the same cursor multiple times
    // Example: "struct SomeStruct {} s;"
    // decl: "SomeStruct SomeStruct " of kind StructDecl (2) in main.cpp@[(1,1),(1,17)]
    // decl: "struct SomeStruct s " of kind VarDecl (9) in main.cpp@[(1,1),(1,19)]
    // decl: "SomeStruct SomeStruct " of kind StructDecl (2) in main.cpp@[(1,1),(1,17)]
    //
    // => We end up visiting the StructDecl twice (or more)
    //    That's because we use clang_visitChildren not just on the translation unit cursor.
    //    Apparently just "recursing" vs. "visiting children explicitly"
    //    results in a different AST traversal

    TestFile file("struct SomeStruct {} s;\n", "cpp");
    file.parse(TopDUContext::AllDeclarationsContextsAndUses);
    QVERIFY(file.waitForParsed());

    DUChainReadLocker lock;
    auto top = file.topContext();
    QVERIFY(top);

    // there should only be one declaration for "SomeStruct"
    auto candidates = top->findDeclarations(QualifiedIdentifier("SomeStruct"));
    QCOMPARE(candidates.size(), 1);
}

void TestDUChain::testParsingEnvironment()
{
    const TopDUContext::Features features = TopDUContext::AllDeclarationsContextsAndUses;

    IndexedTopDUContext indexed;
    ClangParsingEnvironment lastEnv;
    {
        TestFile file("int main() {}\n", "cpp");
        auto astFeatures = static_cast<TopDUContext::Features>(features | TopDUContext::AST);
        file.parse(astFeatures);
        file.setKeepDUChainData(true);
        QVERIFY(file.waitForParsed());

        DUChainWriteLocker lock;
        auto top = file.topContext();
        QVERIFY(top);
        auto sessionData = ParseSessionData::Ptr(dynamic_cast<ParseSessionData*>(top->ast().data()));
        lock.unlock();
        ParseSession session(sessionData);
        lock.lock();
        QVERIFY(session.data());
        QVERIFY(top);

        auto envFile = QExplicitlySharedDataPointer<ClangParsingEnvironmentFile>(
            dynamic_cast<ClangParsingEnvironmentFile*>(file.topContext()->parsingEnvironmentFile().data()));

        QCOMPARE(envFile->features(), astFeatures);
        QVERIFY(envFile->featuresSatisfied(astFeatures));
        QCOMPARE(envFile->environmentQuality(), ClangParsingEnvironment::Source);

        // if no environment is given, no update should be triggered
        QVERIFY(!envFile->needsUpdate());

        // same env should also not trigger a reparse
        ClangParsingEnvironment env = session.environment();
        QCOMPARE(env.quality(), ClangParsingEnvironment::Source);
        QVERIFY(!envFile->needsUpdate(&env));

        // but changing the environment should trigger an update
        env.addIncludes(Path::List() << Path("/foo/bar/baz"));
        QVERIFY(envFile->needsUpdate(&env));
        envFile->setEnvironment(env);
        QVERIFY(!envFile->needsUpdate(&env));

        // setting the environment quality higher should require an update
        env.setQuality(ClangParsingEnvironment::BuildSystem);
        QVERIFY(envFile->needsUpdate(&env));
        envFile->setEnvironment(env);
        QVERIFY(!envFile->needsUpdate(&env));

        // changing defines requires an update
        env.addDefines(QHash<QString, QString>{ { "foo", "bar" } });
        QVERIFY(envFile->needsUpdate(&env));

        // but only when changing the defines for the envFile's TU
        const auto barTU = IndexedString("bar.cpp");
        const auto oldTU = env.translationUnitUrl();
        env.setTranslationUnitUrl(barTU);
        QCOMPARE(env.translationUnitUrl(), barTU);
        QVERIFY(!envFile->needsUpdate(&env));
        env.setTranslationUnitUrl(oldTU);
        QVERIFY(envFile->needsUpdate(&env));

        // update it again
        envFile->setEnvironment(env);
        QVERIFY(!envFile->needsUpdate(&env));
        lastEnv = env;

        // now compare against a lower quality environment
        // in such a case, we do not want to trigger an update
        env.setQuality(ClangParsingEnvironment::Unknown);
        env.setTranslationUnitUrl(barTU);
        QVERIFY(!envFile->needsUpdate(&env));

        // even when the environment changes
        env.addIncludes(Path::List() << Path("/lalalala"));
        QVERIFY(!envFile->needsUpdate(&env));

        indexed = top->indexed();
    }

    DUChain::self()->storeToDisk();

    {
        DUChainWriteLocker lock;
        QVERIFY(!DUChain::self()->isInMemory(indexed.index()));
        QVERIFY(indexed.data());
        QVERIFY(DUChain::self()->environmentFileForDocument(indexed));
        auto envFile = QExplicitlySharedDataPointer<ClangParsingEnvironmentFile>(
            dynamic_cast<ClangParsingEnvironmentFile*>(DUChain::self()->environmentFileForDocument(indexed).data()));
        QVERIFY(envFile);

        QCOMPARE(envFile->features(), features);
        QVERIFY(envFile->featuresSatisfied(features));
        QVERIFY(!envFile->needsUpdate(&lastEnv));
        DUChain::self()->removeDocumentChain(indexed.data());
    }
}

void TestDUChain::testActiveDocumentHasASTAttached()
{
  const TopDUContext::Features features = TopDUContext::AllDeclarationsContextsAndUses;

    IndexedTopDUContext indexed;
    ClangParsingEnvironment lastEnv;
    {
        TestFile file("int main() {}\n", "cpp");
        auto astFeatures = static_cast<TopDUContext::Features>(features | TopDUContext::AST);
        file.parse(astFeatures);
        file.setKeepDUChainData(true);
        QVERIFY(file.waitForParsed());

        DUChainWriteLocker lock;
        auto top = file.topContext();
        QVERIFY(top);
        auto sessionData = ParseSessionData::Ptr(dynamic_cast<ParseSessionData*>(top->ast().data()));
        lock.unlock();
        ParseSession session(sessionData);
        lock.lock();
        QVERIFY(session.data());
        QVERIFY(top);
        QVERIFY(top->ast());

        indexed = top->indexed();
    }

    DUChain::self()->storeToDisk();

    {
        DUChainWriteLocker lock;
        QVERIFY(!DUChain::self()->isInMemory(indexed.index()));
        QVERIFY(indexed.data());
    }

    QUrl url;
    {
        DUChainReadLocker lock;
        auto ctx = indexed.data();
        QVERIFY(ctx);
        QVERIFY(!ctx->ast());
        url = ctx->url().toUrl();
    }

    QVERIFY(!QFileInfo::exists(url.toLocalFile()));
    QFile file(url.toLocalFile());
    file.open(QIODevice::WriteOnly);
    Q_ASSERT(file.isOpen());

    auto document = ICore::self()->documentController()->openDocument(url);
    QVERIFY(document);
    ICore::self()->documentController()->activateDocument(document);

    QApplication::processEvents();
    ICore::self()->languageController()->backgroundParser()->parseDocuments();
    QThread::sleep(1);

    document->close(KDevelop::IDocument::Discard);
    {
        DUChainReadLocker lock;
        auto ctx = indexed.data();
        QVERIFY(ctx);
        QVERIFY(ctx->ast());
    }

    DUChainWriteLocker lock;
    DUChain::self()->removeDocumentChain(indexed.data());
}

void TestDUChain::testActiveDocumentsGetBestPriority()
{
    // note: this test would make more sense in kdevplatform, but we don't have a language plugin available there
    // (required for background parsing)
    // TODO: Create a fake-language plugin in kdevplatform for testing purposes, use that.

    TestFile file1("int main() {}\n", "cpp");
    TestFile file2("int main() {}\n", "cpp");
    TestFile file3("int main() {}\n", "cpp");

    DUChain::self()->storeToDisk();

    auto backgroundParser = ICore::self()->languageController()->backgroundParser();
    QVERIFY(!backgroundParser->isQueued(file1.url()));

    auto documentController = ICore::self()->documentController();

    // open first document (no activation)
    auto doc = documentController->openDocument(file1.url().toUrl(), KTextEditor::Range::invalid(), {IDocumentController::DoNotActivate});
    QVERIFY(doc);
    QVERIFY(backgroundParser->isQueued(file1.url()));
    QCOMPARE(backgroundParser->priorityForDocument(file1.url()), (int)BackgroundParser::NormalPriority);

    // open second document, activate
    doc = documentController->openDocument(file2.url().toUrl());
    QVERIFY(doc);
    QVERIFY(backgroundParser->isQueued(file2.url()));
    QCOMPARE(backgroundParser->priorityForDocument(file2.url()), (int)BackgroundParser::BestPriority);

    // open third document, activate, too
    doc = documentController->openDocument(file3.url().toUrl());
    QVERIFY(doc);
    QVERIFY(backgroundParser->isQueued(file3.url()));
    QCOMPARE(backgroundParser->priorityForDocument(file3.url()), (int)BackgroundParser::BestPriority);
}

void TestDUChain::testSystemIncludes()
{
    ClangParsingEnvironment env;

    Path::List projectIncludes = {
        Path("/projects/1"),
        Path("/projects/1/sub"),
        Path("/projects/2"),
        Path("/projects/2/sub")
    };
    env.addIncludes(projectIncludes);
    auto includes = env.includes();
    // no project paths set, so everything is considered a system include
    QCOMPARE(includes.system, projectIncludes);
    QVERIFY(includes.project.isEmpty());

    Path::List systemIncludes = {
        Path("/sys"),
        Path("/sys/sub")
    };
    env.addIncludes(systemIncludes);
    includes = env.includes();
    QCOMPARE(includes.system, projectIncludes + systemIncludes);
    QVERIFY(includes.project.isEmpty());

    Path::List projects = {
        Path("/projects/1"),
        Path("/projects/2")
    };
    env.setProjectPaths(projects);
    // now the list should be properly separated
    QCOMPARE(env.projectPaths(), projects);
    includes = env.includes();
    QCOMPARE(includes.system, systemIncludes);
    QCOMPARE(includes.project, projectIncludes);
}

void TestDUChain::benchDUChainBuilder()
{
    QBENCHMARK_ONCE {
        TestFile file(
            "#include <vector>\n"
            "#include <map>\n"
            "#include <set>\n"
            "#include <algorithm>\n"
            "#include <functional>\n"
            "#include <limits>\n"
            "#include <bitset>\n"
            "#include <iostream>\n"
            "#include <string>\n"
            "#include <mutex>\n", "cpp");
        file.parse(TopDUContext::AllDeclarationsContextsAndUses);
        QVERIFY(file.waitForParsed(60000));

        DUChainReadLocker lock;
        auto top = file.topContext();
        QVERIFY(top);
    }
}

void TestDUChain::testReparseWithAllDeclarationsContextsAndUses()
{
    TestFile file("int foo() { return 0; } int main() { return foo(); }", "cpp");
    file.parse(TopDUContext::VisibleDeclarationsAndContexts);

    QVERIFY(file.waitForParsed(1000));

    {
        DUChainReadLocker lock;
        QVERIFY(file.topContext());
        QCOMPARE(file.topContext()->childContexts().size(), 2);
        QCOMPARE(file.topContext()->localDeclarations().size(), 2);

        auto dec = file.topContext()->localDeclarations().at(0);
        QEXPECT_FAIL("", "Skipping of function bodies is disabled for now", Continue);
        QVERIFY(dec->uses().isEmpty());
    }

    file.parse(TopDUContext::AllDeclarationsContextsAndUses);

    QVERIFY(file.waitForParsed(500));

    {
        DUChainReadLocker lock;
        QVERIFY(file.topContext());
        QCOMPARE(file.topContext()->childContexts().size(), 2);
        QCOMPARE(file.topContext()->localDeclarations().size(), 2);

        auto mainDecl = file.topContext()->localDeclarations()[1];
        QVERIFY(mainDecl->uses().isEmpty());
        auto foo = file.topContext()->localDeclarations().first();
        QCOMPARE(foo->uses().size(), 1);
    }
}

void TestDUChain::testReparseOnDocumentActivated()
{
    TestFile file("int foo() { return 0; } int main() { return foo(); }", "cpp");
    file.parse(TopDUContext::VisibleDeclarationsAndContexts);

    QVERIFY(file.waitForParsed(1000));

    {
        DUChainReadLocker lock;
        auto ctx = file.topContext();
        QVERIFY(ctx);
        QCOMPARE(ctx->childContexts().size(), 2);
        QCOMPARE(ctx->localDeclarations().size(), 2);

        auto dec = ctx->localDeclarations().at(0);
        QEXPECT_FAIL("", "Skipping of function bodies was disabled for now", Continue);
        QVERIFY(dec->uses().isEmpty());

        QVERIFY(!ctx->ast());
    }

    auto backgroundParser = ICore::self()->languageController()->backgroundParser();
    QVERIFY(!backgroundParser->isQueued(file.url()));

    auto doc = ICore::self()->documentController()->openDocument(file.url().toUrl());
    QVERIFY(doc);
    QVERIFY(backgroundParser->isQueued(file.url()));

    QSignalSpy spy(backgroundParser, &BackgroundParser::parseJobFinished);
    spy.wait();

    doc->close(KDevelop::IDocument::Discard);

    {
        DUChainReadLocker lock;
        auto ctx = file.topContext();
        QCOMPARE(ctx->features() & TopDUContext::AllDeclarationsContextsAndUses, static_cast<int>(TopDUContext::AllDeclarationsContextsAndUses));
        QVERIFY(ctx->topContext()->ast());
    }
}

void TestDUChain::testReparseInclude()
{
    TestFile header("int foo() { return 42; }\n", "h");
    TestFile impl("#include \"" + header.url().byteArray() + "\"\n"
                  "int main() { return foo(); }", "cpp", &header);

    // Use TopDUContext::AST to imitate that document is opened in the editor, so that ClangParseJob can store translation unit, that'll be used for reparsing.
    impl.parse(TopDUContext::Features(TopDUContext::AllDeclarationsAndContexts|TopDUContext::AST));
    QVERIFY(impl.waitForParsed(5000));
    {
        DUChainReadLocker lock;
        auto implCtx = impl.topContext();
        QVERIFY(implCtx);
        QCOMPARE(implCtx->importedParentContexts().size(), 1);
    }

    impl.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses|TopDUContext::AST));
    QVERIFY(impl.waitForParsed(5000));

    DUChainReadLocker lock;
    auto implCtx = impl.topContext();
    QVERIFY(implCtx);
    QCOMPARE(implCtx->localDeclarations().size(), 1);

    QCOMPARE(implCtx->importedParentContexts().size(), 1);

    auto headerCtx = DUChain::self()->chainForDocument(header.url());
    QVERIFY(headerCtx);
    QVERIFY(!headerCtx->parsingEnvironmentFile()->needsUpdate());
    QCOMPARE(headerCtx->localDeclarations().size(), 1);

    QVERIFY(implCtx->imports(headerCtx, CursorInRevision(0, 10)));

    Declaration* foo = headerCtx->localDeclarations().first();
    QCOMPARE(foo->uses().size(), 1);
    QCOMPARE(foo->uses().begin().key(), impl.url());
    QCOMPARE(foo->uses().begin()->size(), 1);
    QCOMPARE(foo->uses().begin()->first(), RangeInRevision(1, 20, 1, 23));

    QCOMPARE(DUChain::self()->allEnvironmentFiles(header.url()).size(), 1);
    QCOMPARE(DUChain::self()->allEnvironmentFiles(impl.url()).size(), 1);
    QCOMPARE(DUChain::self()->chainsForDocument(header.url()).size(), 1);
    QCOMPARE(DUChain::self()->chainsForDocument(impl.url()).size(), 1);
}

void TestDUChain::testReparseChangeEnvironment()
{
    TestFile header("int foo() { return 42; }\n", "h");
    TestFile impl("#include \"" + header.url().byteArray() + "\"\n"
                  "int main() { return foo(); }", "cpp", &header);

    uint hashes[3] = {0, 0, 0};

    for (int i = 0; i < 3; ++i) {
        impl.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses|TopDUContext::AST|TopDUContext::ForceUpdate));
        QVERIFY(impl.waitForParsed(5000));

        {
            DUChainReadLocker lock;
            QVERIFY(impl.topContext());
            auto env = dynamic_cast<ClangParsingEnvironmentFile*>(impl.topContext()->parsingEnvironmentFile().data());
            QVERIFY(env);
            QCOMPARE(env->environmentQuality(), ClangParsingEnvironment::Source);
            hashes[i] = env->environmentHash();
            QVERIFY(hashes[i]);

            // we should never end up with multiple env files or chains in memory for these files
            QCOMPARE(DUChain::self()->allEnvironmentFiles(impl.url()).size(), 1);
            QCOMPARE(DUChain::self()->chainsForDocument(impl.url()).size(), 1);
            QCOMPARE(DUChain::self()->allEnvironmentFiles(header.url()).size(), 1);
            QCOMPARE(DUChain::self()->chainsForDocument(header.url()).size(), 1);
        }

        // in every run, we expect the environment to have changed
        for (int j = 0; j < i; ++j) {
            QVERIFY(hashes[i] != hashes[j]);
        }

        if (i == 0) {
            // 1) change defines
            m_provider->defines.insert("foooooooo", "baaar!");
        } else if (i == 1) {
            // 2) change includes
            m_provider->includes.append(Path("/foo/bar/asdf/lalala"));
        } // 3) stop
    }
}

void TestDUChain::testMacroDependentHeader()
{
    TestFile header("struct MY_CLASS { class Q{Q(); int m;}; int m; };\n", "h");
    TestFile impl("#define MY_CLASS A\n"
                  "#include \"" + header.url().byteArray() + "\"\n"
                  "#undef MY_CLASS\n"
                  "#define MY_CLASS B\n"
                  "#include \"" + header.url().byteArray() + "\"\n"
                  "#undef MY_CLASS\n"
                  "A a;\n"
                  "const A::Q aq;\n"
                  "B b;\n"
                  "const B::Q bq;\n"
                  "int am = a.m;\n"
                  "int aqm = aq.m;\n"
                  "int bm = b.m;\n"
                  "int bqm = bq.m;\n"
                  , "cpp", &header);

    impl.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses|TopDUContext::AST|TopDUContext::ForceUpdate));
    QVERIFY(impl.waitForParsed(500000));

    DUChainReadLocker lock;
    TopDUContext* top = impl.topContext().data();
    QVERIFY(top);
    QCOMPARE(top->localDeclarations().size(), 10); // 2x macro, then a, aq, b, bq
    QCOMPARE(top->importedParentContexts().size(), 1);
    AbstractType::Ptr type = top->localDeclarations()[2]->abstractType();
    StructureType* sType = dynamic_cast<StructureType*>(type.data());
    QVERIFY(sType);
    QCOMPARE(sType->toString(), QString("A"));
    Declaration* decl = sType->declaration(top);
    QVERIFY(decl);
    AbstractType::Ptr type2 = top->localDeclarations()[4]->abstractType();
    StructureType* sType2 = dynamic_cast<StructureType*>(type2.data());
    QVERIFY(sType2);
    QCOMPARE(sType2->toString(), QString("B"));
    Declaration* decl2 = sType2->declaration(top);
    QVERIFY(decl2);

    TopDUContext* top2 = dynamic_cast<TopDUContext*>(top->importedParentContexts()[0].context(top));
    QVERIFY(top2);
    QCOMPARE(top2->localDeclarations().size(), 2);
    QCOMPARE(top2->localDeclarations()[0], decl);
    QCOMPARE(top2->localDeclarations()[1], decl2);
    qDebug() << "DECL RANGE:" << top2->localDeclarations()[0]->range().castToSimpleRange();
    qDebug() << "CTX RANGE:" << top2->localDeclarations()[0]->internalContext()->range().castToSimpleRange();

    // validate uses:
    QCOMPARE(top->usesCount(), 14);
    QCOMPARE(top->uses()[0].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("A"));
    QCOMPARE(top->uses()[1].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("A"));
    QCOMPARE(top->uses()[2].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("A::Q"));
    QCOMPARE(top->uses()[3].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("B"));
    QCOMPARE(top->uses()[4].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("B"));
    QCOMPARE(top->uses()[5].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("B::Q"));
    QCOMPARE(top->uses()[6].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("a"));
    QCOMPARE(top->uses()[7].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("A::m"));
    QCOMPARE(top->uses()[8].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("aq"));
    QCOMPARE(top->uses()[9].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("A::Q::m"));
    QCOMPARE(top->uses()[10].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("b"));
    QCOMPARE(top->uses()[11].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("B::m"));
    QCOMPARE(top->uses()[12].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("bq"));
    QCOMPARE(top->uses()[13].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("B::Q::m"));
}

void TestDUChain::testHeaderParsingOrder1()
{
    TestFile header("typedef const A<int> B;\n", "h");
    TestFile impl("template<class T> class A{};\n"
                  "#include \"" + header.url().byteArray() + "\"\n"
                  "B c;", "cpp", &header);

    impl.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses|TopDUContext::AST|TopDUContext::ForceUpdate));
    QVERIFY(impl.waitForParsed(500000));

    DUChainReadLocker lock;
    TopDUContext* top = impl.topContext().data();
    QVERIFY(top);
    QCOMPARE(top->localDeclarations().size(), 2);
    QCOMPARE(top->importedParentContexts().size(), 1);
    AbstractType::Ptr type = top->localDeclarations()[1]->abstractType();
    TypeAliasType* aType = dynamic_cast<TypeAliasType*>(type.data());
    QVERIFY(aType);
    AbstractType::Ptr targetType = aType->type();
    QVERIFY(targetType);
    IdentifiedType *idType = dynamic_cast<IdentifiedType*>(targetType.data());
    QVERIFY(idType);
    // this declaration could be resolved, because it was created with an
    // indirect DeclarationId that is resolved from the perspective of 'top'
    Declaration* decl = idType->declaration(top);
    // NOTE: the decl. doesn't know (yet) about the template insantiation <int>
    QVERIFY(decl);
    QCOMPARE(decl, top->localDeclarations()[0]);
    
    // now ensure that a use was build for 'A' in header1
    TopDUContext* top2 = dynamic_cast<TopDUContext*>(top->importedParentContexts()[0].context(top));
    QVERIFY(top2);
    QEXPECT_FAIL("", "the use could not be created because the corresponding declaration didn't exist yet", Continue);
    QCOMPARE(top2->usesCount(), 1);
    // Declaration* decl2 = top2->uses()[0].usedDeclaration(top2);
    // QVERIFY(decl2);
    // QCOMPARE(decl, decl2);
}

void TestDUChain::testHeaderParsingOrder2()
{
    TestFile header("template<class T> class A{};\n", "h");
    TestFile header2("typedef const A<int> B;\n", "h");
    TestFile impl("#include \"" + header.url().byteArray() + "\"\n"
                  "#include \"" + header2.url().byteArray() + "\"\n"
                  "B c;", "cpp", &header);

    impl.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses|TopDUContext::AST|TopDUContext::ForceUpdate));
    QVERIFY(impl.waitForParsed(500000));

    DUChainReadLocker lock;
    TopDUContext* top = impl.topContext().data();
    QVERIFY(top);
    QCOMPARE(top->localDeclarations().size(), 1);
    QCOMPARE(top->importedParentContexts().size(), 2);
    AbstractType::Ptr type = top->localDeclarations()[0]->abstractType();
    TypeAliasType* aType = dynamic_cast<TypeAliasType*>(type.data());
    QVERIFY(aType);
    AbstractType::Ptr targetType = aType->type();
    QVERIFY(targetType);
    IdentifiedType *idType = dynamic_cast<IdentifiedType*>(targetType.data());
    QVERIFY(idType);
    Declaration* decl = idType->declaration(top);
    // NOTE: the decl. doesn't know (yet) about the template insantiation <int>
    QVERIFY(decl);
    
    // now ensure that a use was build for 'A' in header2
    TopDUContext* top2 = dynamic_cast<TopDUContext*>(top->importedParentContexts()[1].context(top));
    QVERIFY(top2);
    QCOMPARE(top2->usesCount(), 1);
    Declaration* decl2 = top2->uses()[0].usedDeclaration(top2);
    QCOMPARE(decl, decl2);
}

void TestDUChain::testMacrosRanges()
{
    TestFile file("#define FUNC_MACROS(x) struct str##x{};\nFUNC_MACROS(x);", "cpp");
    file.parse(TopDUContext::AllDeclarationsContextsAndUses);
    QVERIFY(file.waitForParsed(5000));

    DUChainReadLocker lock;
    QVERIFY(file.topContext());
    QCOMPARE(file.topContext()->localDeclarations().size(), 2);
    auto macroDefinition = file.topContext()->localDeclarations()[0];
    QVERIFY(macroDefinition);
    QCOMPARE(macroDefinition->range(), RangeInRevision(0,8,0,19));
    auto structDeclaration = file.topContext()->localDeclarations()[1];
    QVERIFY(structDeclaration);
    QCOMPARE(structDeclaration->range(), RangeInRevision(1,0,1,0));

    QCOMPARE(macroDefinition->uses().size(), 1);
    QCOMPARE(macroDefinition->uses().begin()->first(), RangeInRevision(1,0,1,11));
}

void TestDUChain::testMacroUses()
{
    TestFile file("#define USER(x) x\n#define USED\nUSER(USED)", "cpp");
    file.parse(TopDUContext::AllDeclarationsContextsAndUses);
    QVERIFY(file.waitForParsed(5000));

    DUChainReadLocker lock;
    QVERIFY(file.topContext());
    QCOMPARE(file.topContext()->localDeclarations().size(), 2);
    auto macroDefinition1 = file.topContext()->localDeclarations()[0];
    auto macroDefinition2 = file.topContext()->localDeclarations()[1];

    QCOMPARE(macroDefinition1->uses().size(), 1);
    QCOMPARE(macroDefinition1->uses().begin()->first(), RangeInRevision(2,0,2,4));
#if CINDEX_VERSION_MINOR < 32
    QEXPECT_FAIL("", "This appears to be a clang bug, the AST doesn't contain the macro use", Continue);
#endif
    QCOMPARE(macroDefinition2->uses().size(), 1);
    if (macroDefinition2->uses().size())
    {
        QCOMPARE(macroDefinition2->uses().begin()->first(), RangeInRevision(2,5,2,9));
    }
}

void TestDUChain::testMultiLineMacroRanges()
{
    TestFile file("#define FUNC_MACROS(x) struct str##x{};\nFUNC_MACROS(x\n);", "cpp");
    file.parse(TopDUContext::AllDeclarationsContextsAndUses);
    QVERIFY(file.waitForParsed(5000));

    DUChainReadLocker lock;
    QVERIFY(file.topContext());
    QCOMPARE(file.topContext()->localDeclarations().size(), 2);
    auto macroDefinition = file.topContext()->localDeclarations()[0];
    QVERIFY(macroDefinition);
    QCOMPARE(macroDefinition->range(), RangeInRevision(0,8,0,19));
    auto structDeclaration = file.topContext()->localDeclarations()[1];
    QVERIFY(structDeclaration);
    QCOMPARE(structDeclaration->range(), RangeInRevision(1,0,1,0));

    QCOMPARE(macroDefinition->uses().size(), 1);
    QCOMPARE(macroDefinition->uses().begin()->first(), RangeInRevision(1,0,1,11));
}

void TestDUChain::testNestedMacroRanges()
{
    TestFile file("#define INNER int var; var = 0;\n#define MACRO() INNER\nint main(){MACRO(\n);}", "cpp");
    file.parse(TopDUContext::AllDeclarationsContextsAndUses);
    QVERIFY(file.waitForParsed(5000));

    DUChainReadLocker lock;
    QVERIFY(file.topContext());
    QCOMPARE(file.topContext()->localDeclarations().size(), 3);
    auto main = file.topContext()->localDeclarations()[2];
    QVERIFY(main);
    auto mainCtx = main->internalContext()->childContexts().first();
    QVERIFY(mainCtx);
    QCOMPARE(mainCtx->localDeclarations().size(), 1);
    auto var = mainCtx->localDeclarations().first();
    QVERIFY(var);
    QCOMPARE(var->range(), RangeInRevision(2,11,2,11));

    QCOMPARE(var->uses().size(), 1);
    QCOMPARE(var->uses().begin()->first(), RangeInRevision(2,11,2,11));
}

void TestDUChain::testNestedImports()
{
    TestFile B("#pragma once\nint B();\n", "h");
    TestFile C("#pragma once\n#include \"" + B.url().byteArray() + "\"\nint C();\n", "h");
    TestFile A("#include \"" + B.url().byteArray() + "\"\n" + "#include \"" + C.url().byteArray() + "\"\nint A();\n", "cpp");

    A.parse();
    QVERIFY(A.waitForParsed(5000));

    DUChainReadLocker lock;

    auto BCtx = DUChain::self()->chainForDocument(B.url().toUrl());
    QVERIFY(BCtx);
    QVERIFY(BCtx->importedParentContexts().isEmpty());

    auto CCtx = DUChain::self()->chainForDocument(C.url().toUrl());
    QVERIFY(CCtx);
    QCOMPARE(CCtx->importedParentContexts().size(), 1);
    QVERIFY(CCtx->imports(BCtx, CursorInRevision(1, 10)));

    auto ACtx = A.topContext();
    QVERIFY(ACtx);
    QCOMPARE(ACtx->importedParentContexts().size(), 2);
    QVERIFY(ACtx->imports(BCtx, CursorInRevision(0, 10)));
    QVERIFY(ACtx->imports(CCtx, CursorInRevision(1, 10)));
}

void TestDUChain::testEnvironmentWithDifferentOrderOfElements()
{
    TestFile file("int main();\n", "cpp");

    m_provider->includes.clear();
    m_provider->includes.append(Path("/path1"));
    m_provider->includes.append(Path("/path2"));

    m_provider->defines.clear();
    m_provider->defines.insert("key1", "value1");
    m_provider->defines.insert("key2", "value2");
    m_provider->defines.insert("key3", "value3");

    uint previousHash = 0;
    for (int i: {0, 1, 2, 3}) {
        file.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses|TopDUContext::AST|TopDUContext::ForceUpdate));

        QVERIFY(file.waitForParsed(5000));

        {
            DUChainReadLocker lock;
            QVERIFY(file.topContext());
            auto env = dynamic_cast<ClangParsingEnvironmentFile*>(file.topContext()->parsingEnvironmentFile().data());
            QVERIFY(env);
            QCOMPARE(env->environmentQuality(), ClangParsingEnvironment::Source);
            if (previousHash) {
                if (i == 3) {
                    QVERIFY(previousHash != env->environmentHash());
                } else {
                    QCOMPARE(previousHash, env->environmentHash());
                }
            }
            previousHash = env->environmentHash();
            QVERIFY(previousHash);
        }

        if (i == 0) {
            //Change order of defines. Hash of the environment should stay the same.
            m_provider->defines.clear();
            m_provider->defines.insert("key3", "value3");
            m_provider->defines.insert("key1", "value1");
            m_provider->defines.insert("key2", "value2");
        } else if (i == 1) {
            //Add the same macros twice. Hash of the environment should stay the same.
            m_provider->defines.clear();
            m_provider->defines.insert("key2", "value2");
            m_provider->defines.insert("key3", "value3");
            m_provider->defines.insert("key3", "value3");
            m_provider->defines.insert("key1", "value1");
        } else if (i == 2) {
            //OTOH order of includes should change hash of the environment.
            m_provider->includes.clear();
            m_provider->includes.append(Path("/path2"));
            m_provider->includes.append(Path("/path1"));
        }
    }
}

void TestDUChain::testReparseMacro()
{
    TestFile file("#define DECLARE(a) typedef struct a##_ {} *a;\nDECLARE(D);\nD d;", "cpp");
    file.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses|TopDUContext::AST));
    QVERIFY(file.waitForParsed(5000));

    {
        DUChainReadLocker lock;
        QVERIFY(file.topContext());
    }

    file.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses|TopDUContext::AST|TopDUContext::ForceUpdate));
    QVERIFY(file.waitForParsed(5000));

    DUChainReadLocker lock;
    QVERIFY(file.topContext());
    QCOMPARE(file.topContext()->localDeclarations().size(), 5);

    auto macroDefinition = file.topContext()->localDeclarations()[0];
    QVERIFY(macroDefinition);
    QCOMPARE(macroDefinition->range(), RangeInRevision(0,8,0,15));
    QCOMPARE(macroDefinition->uses().size(), 1);
    QCOMPARE(macroDefinition->uses().begin()->first(), RangeInRevision(1,0,1,7));

    auto structDeclaration = file.topContext()->localDeclarations()[1];
    QVERIFY(structDeclaration);
    QCOMPARE(structDeclaration->range(), RangeInRevision(1,0,1,0));

    auto structTypedef = file.topContext()->localDeclarations()[3];
    QVERIFY(structTypedef);
    QCOMPARE(structTypedef->range(), RangeInRevision(1,8,1,9));
    QCOMPARE(structTypedef->uses().size(), 1);
    QCOMPARE(structTypedef->uses().begin()->first(), RangeInRevision(2,0,2,1));
}

void TestDUChain::testGotoStatement()
{
    TestFile file("int main() {\ngoto label;\ngoto label;\nlabel: return 0;}", "cpp");
    file.parse(TopDUContext::AllDeclarationsContextsAndUses);
    QVERIFY(file.waitForParsed(5000));

    DUChainReadLocker lock;
    QVERIFY(file.topContext());
    QCOMPARE(file.topContext()->localDeclarations().size(), 1);
    auto main = file.topContext()->localDeclarations()[0];
    QVERIFY(main);
    auto mainCtx = main->internalContext()->childContexts().first();
    QVERIFY(mainCtx);
    QCOMPARE(mainCtx->localDeclarations().size(), 1);
    auto label = mainCtx->localDeclarations().first();
    QVERIFY(label);
    QCOMPARE(label->range(), RangeInRevision(3,0,3,5));

    QCOMPARE(label->uses().size(), 1);
    QCOMPARE(label->uses().begin()->first(), RangeInRevision(1,5,1,10));
    QCOMPARE(label->uses().begin()->last(), RangeInRevision(2,5,2,10));
}

void TestDUChain::testRangesOfOperatorsInsideMacro()
{
    TestFile file("class Test{public: Test& operator++(int);};\n#define MACRO(var) var++;\nint main(){\nTest tst; MACRO(tst)}", "cpp");
    file.parse(TopDUContext::AllDeclarationsContextsAndUses);
    QVERIFY(file.waitForParsed(5000));

    DUChainReadLocker lock;
    QVERIFY(file.topContext());
    QCOMPARE(file.topContext()->localDeclarations().size(), 3);
    auto testClass = file.topContext()->localDeclarations()[0];
    QVERIFY(testClass);
    auto operatorPlusPlus = testClass->internalContext()->localDeclarations().first();
    QVERIFY(operatorPlusPlus);
    QCOMPARE(operatorPlusPlus->uses().size(), 1);
    QCOMPARE(operatorPlusPlus->uses().begin()->first(), RangeInRevision(3,10,3,10));
}

void TestDUChain::testUsesCreatedForDeclarations()
{
    auto code = R"(template<typename T> void functionTemplate(T);
            template<typename U> void functionTemplate(U) {}

            namespace NS { class Class{}; }
            using NS::Class;

            Class function();
            NS::Class function() { return {}; }

            int main () {
                functionTemplate(int());
                function(); }
    )";
    TestFile file(code, "cpp");
    file.parse(TopDUContext::AllDeclarationsContextsAndUses);
    QVERIFY(file.waitForParsed());

    DUChainReadLocker lock;
    QVERIFY(file.topContext());

    auto functionTemplate = file.topContext()->findDeclarations(QualifiedIdentifier("functionTemplate"));
    QVERIFY(!functionTemplate.isEmpty());
    auto functionTemplateDeclaration = DUChainUtils::declarationForDefinition(functionTemplate.first());
    QVERIFY(!functionTemplateDeclaration->isDefinition());
#if CINDEX_VERSION_MINOR < 29
    QEXPECT_FAIL("", "No API in LibClang to determine function template type", Continue);
#endif
    QCOMPARE(functionTemplateDeclaration->uses().count(), 1);

    auto function = file.topContext()->findDeclarations(QualifiedIdentifier("function"));
    QVERIFY(!function.isEmpty());
    auto functionDeclaration = DUChainUtils::declarationForDefinition(function.first());
    QVERIFY(!functionDeclaration->isDefinition());
    QCOMPARE(functionDeclaration->uses().count(), 1);
}

void TestDUChain::testReparseIncludeGuard()
{
    TestFile header("#ifndef GUARD\n#define GUARD\nint something;\n#endif\n", "h");
    TestFile impl("#include \"" + header.url().byteArray() + "\"\n", "cpp", &header);

    QVERIFY(impl.parseAndWait(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses | TopDUContext::AST  )));
    {
        DUChainReadLocker lock;
        QCOMPARE(static_cast<TopDUContext*>(impl.topContext()->
            importedParentContexts().first().context(impl.topContext()))->problems().size(), 0);
    }
    QVERIFY(impl.parseAndWait(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses | TopDUContext::ForceUpdateRecursive)));
    {
        DUChainReadLocker lock;
        QCOMPARE(static_cast<TopDUContext*>(impl.topContext()->
            importedParentContexts().first().context(impl.topContext()))->problems().size(), 0);
    }
}

void TestDUChain::testExternC()
{
    auto code = R"(extern "C" { void foo(); })";
    TestFile file(code, "cpp");
    file.parse(TopDUContext::AllDeclarationsContextsAndUses);
    QVERIFY(file.waitForParsed());

    DUChainReadLocker lock;
    auto top = file.topContext();
    QVERIFY(top);
    QVERIFY(!top->findDeclarations(QualifiedIdentifier("foo")).isEmpty());
}

void TestDUChain::testReparseUnchanged_data()
{
    QTest::addColumn<QString>("headerCode");
    QTest::addColumn<QString>("implCode");

    QTest::newRow("include-guards") << R"(
        #ifndef GUARD
        #define GUARD
        int something;
        #endif
    )" << R"(
        #include "%1"
    )";

    QTest::newRow("template-default-parameters") << R"(
        #ifndef TEST_H
        #define TEST_H

        template<unsigned T=123, unsigned... U>
        class dummy;

        template<unsigned T, unsigned... U>
        class dummy {
            int field[T];
        };

        #endif
    )" << R"(
        #include "%1"

        int main(int, char **) {
            dummy<> x;
            (void)x;
        }
    )";
}

void TestDUChain::testReparseUnchanged()
{
    QFETCH(QString, headerCode);
    QFETCH(QString, implCode);
    TestFile header(headerCode, "h");
    TestFile impl(implCode.arg(header.url().str()), "cpp", &header);

    auto checkProblems = [&] (bool reparsed) {
        DUChainReadLocker lock;
        auto headerCtx = DUChain::self()->chainForDocument(header.url());
        QVERIFY(headerCtx);
        QVERIFY(headerCtx->problems().isEmpty());
        auto implCtx = DUChain::self()->chainForDocument(impl.url());
        QVERIFY(implCtx);
        if (reparsed && CINDEX_VERSION_MINOR > 29 && CINDEX_VERSION_MINOR < 33) {
            QEXPECT_FAIL("template-default-parameters", "the precompiled preamble messes the default template parameters up in clang 3.7", Continue);
        }
        QVERIFY(implCtx->problems().isEmpty());
    };

    impl.parseAndWait(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses | TopDUContext::AST  ));
    checkProblems(false);

    impl.parseAndWait(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses | TopDUContext::ForceUpdateRecursive));
    checkProblems(true);
}

void TestDUChain::testTypeAliasTemplate()
{
    TestFile file("template <typename T> using TypeAliasTemplate = T;", "cpp");
    QVERIFY(file.parseAndWait());

    DUChainReadLocker lock;
    QVERIFY(file.topContext());

    auto templateAlias = file.topContext()->localDeclarations().last();
    QVERIFY(templateAlias);
#if CINDEX_VERSION_MINOR < 31
    QEXPECT_FAIL("", "TypeAliasTemplate is not exposed via LibClang", Abort);
#endif
    QVERIFY(templateAlias->abstractType());
    QCOMPARE(templateAlias->abstractType()->toString(), QStringLiteral("TypeAliasTemplate"));
}

void TestDUChain::testDeclarationsInsideMacroExpansion()
{
    TestFile header("#define DECLARE(a) typedef struct a##__ {int var;} *a\nDECLARE(D);\n", "h");
    TestFile file("#include \"" + header.url().byteArray() + "\"\nint main(){\nD d; d->var;}\n", "cpp");

    file.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses|TopDUContext::AST));
    QVERIFY(file.waitForParsed(5000));

    {
        DUChainReadLocker lock;
        QVERIFY(file.topContext());
    }

    file.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses|TopDUContext::AST|TopDUContext::ForceUpdate));
    QVERIFY(file.waitForParsed(5000));

    DUChainReadLocker lock;
    QVERIFY(file.topContext());
    QCOMPARE(file.topContext()->localDeclarations().size(), 1);

    auto context = file.topContext()->childContexts().first()->childContexts().first();
    QVERIFY(context);
    QCOMPARE(context->localDeclarations().size(), 1);
    QCOMPARE(context->usesCount(), 3);

    QCOMPARE(context->uses()[0].m_range, RangeInRevision({2, 0}, {2, 1}));
    QCOMPARE(context->uses()[1].m_range, RangeInRevision({2, 5}, {2, 6}));
    QCOMPARE(context->uses()[2].m_range, RangeInRevision({2, 8}, {2, 11}));
}

// see also: https://bugs.kde.org/show_bug.cgi?id=368067
void TestDUChain::testForwardTemplateTypeParameterContext()
{
    TestFile file(R"(
        template<typename MatchingName> class Foo;

        class MatchingName { void bar(); };
        void MatchingName::bar() {  }
    )", "cpp");

    file.parse();
    QVERIFY(file.waitForParsed(500));
    DUChainReadLocker lock;
    const auto top = file.topContext();
    QVERIFY(top);
    DUChainDumper dumper(DUChainDumper::Features(DUChainDumper::DumpContext | DUChainDumper::DumpProblems));
    dumper.dump(top);

    auto declarations = top->localDeclarations();
    QCOMPARE(declarations.size(), 2);
}

// see also: https://bugs.kde.org/show_bug.cgi?id=368460
void TestDUChain::testTemplateFunctionParameterName()
{
    TestFile file(R"(
        template<class T>
        void foo(int name);

        void bar(int name);
    )", "cpp");

    file.parse();
    QVERIFY(file.waitForParsed(500));
    DUChainReadLocker lock;
    const auto top = file.topContext();
    QVERIFY(top);
    DUChainDumper dumper(DUChainDumper::Features(DUChainDumper::DumpContext | DUChainDumper::DumpProblems));
    dumper.dump(top);

    auto declarations = top->localDeclarations();
    QCOMPARE(declarations.size(), 2);

    for (auto decl : declarations) {
        auto ctx = DUChainUtils::getArgumentContext(decl);
        QVERIFY(ctx);
        auto args = ctx->localDeclarations();
        if (decl == declarations.first())
            QEXPECT_FAIL("", "We get two declarations, for both template and args :(", Continue);
        QCOMPARE(args.size(), 1);
        if (decl == declarations.first())
            QEXPECT_FAIL("", "see above, this then triggers T T here", Continue);
        QCOMPARE(args.first()->toString(), QStringLiteral("int name"));
    }
}

static bool containsErrors(const QList<Problem::Ptr>& problems)
{
    auto it = std::find_if(problems.begin(), problems.end(), [] (const Problem::Ptr& problem) {
        return problem->severity() == Problem::Error;
    });
    return it != problems.end();
}

static bool expectedXmmintrinErrors(const QList<Problem::Ptr>& problems)
{
    foreach (const auto& problem, problems) {
        if (problem->severity() == Problem::Error && !problem->description().contains("Cannot initialize a parameter of type")) {
            return false;
        }
    }
    return true;
}

static void verifyNoErrors(TopDUContext* top, QSet<TopDUContext*>& checked)
{
    const auto problems = top->problems();
    if (containsErrors(problems)) {
        qDebug() << top->url() << top->problems();
        if (top->url().str().endsWith("xmmintrin.h") && expectedXmmintrinErrors(problems)) {
            QEXPECT_FAIL("", "there are still some errors in xmmintrin.h b/c some clang provided intrinsincs are more strict than the GCC ones.", Continue);
            QVERIFY(false);
        } else {
            QFAIL("parse error detected");
        }
    }
    const auto imports = top->importedParentContexts();
    foreach (const auto& import, imports) {
        auto ctx = import.context(top);
        QVERIFY(ctx);
        auto importedTop = ctx->topContext();
        if (checked.contains(importedTop)) {
            continue;
        }
        checked.insert(importedTop);
        verifyNoErrors(importedTop, checked);
    }
}

void TestDUChain::testGccCompatibility()
{
    // TODO: make it easier to change the compiler provider for testing purposes
    QTemporaryDir dir;
    auto project = new TestProject(Path(dir.path()), this);
    auto definesAndIncludesConfig = project->projectConfiguration()->group("CustomDefinesAndIncludes");
    auto pathConfig = definesAndIncludesConfig.group("ProjectPath0");
    pathConfig.writeEntry("Path", ".");
    pathConfig.group("Compiler").writeEntry("Name", "GCC");
    m_projectController->addProject(project);

    {
        // TODO: Also test in C mode. Currently it doesn't work (some intrinsics missing?)
        TestFile file(R"(
            #include <x86intrin.h>

            int main() { return 0; }
        )", "cpp", project, dir.path());

        file.parse();
        QVERIFY(file.waitForParsed(5000));

        DUChainReadLocker lock;
        QSet<TopDUContext*> checked;
        verifyNoErrors(file.topContext(), checked);
    }

    m_projectController->closeAllProjects();
}

void TestDUChain::testQtIntegration()
{
    QTemporaryDir includeDir;
    {
        QDir dir(includeDir.path());
        dir.mkdir("QtCore");
        // create the file but don't put anything in it
        QFile header(includeDir.path() + "/QtCore/qobjectdefs.h");
        QVERIFY(header.open(QIODevice::WriteOnly | QIODevice::Text));
    }
    QTemporaryDir dir;
    auto project = new TestProject(Path(dir.path()), this);
    m_provider->defines.clear();
    m_provider->includes = {Path(includeDir.path() + "/QtCore")};

    m_projectController->addProject(project);

    {
        TestFile file(R"(
            #define slots
            #define signals
            #define Q_SLOTS
            #define Q_SIGNALS
            #include <QtCore/qobjectdefs.h>

            struct MyObject {
            public:
              void other1();
            public slots:
              void slot1();
            signals:
              void signal1();
            private Q_SLOTS:
              void slot2();
            Q_SIGNALS:
              void signal2();
            public:
              void other2();
            };
        )", "cpp", project, dir.path());

        file.parse();
        QVERIFY(file.waitForParsed(5000));

        DUChainReadLocker lock;
        auto top = file.topContext();
        QVERIFY(top);
        QVERIFY(top->problems().isEmpty());
        const auto methods = top->childContexts().last()->localDeclarations();
        QCOMPARE(methods.size(), 6);
        foreach(auto method, methods) {
            auto classFunction = dynamic_cast<ClassFunctionDeclaration*>(method);
            QVERIFY(classFunction);
            auto id = classFunction->identifier().toString();
            QCOMPARE(classFunction->isSignal(), id.startsWith(QLatin1String("signal")));
            QCOMPARE(classFunction->isSlot(), id.startsWith(QLatin1String("slot")));
        }
    }

    m_projectController->closeAllProjects();
}