libreoffice/compilerplugins/clang/test/flatten.cxx

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

#include <exception>

extern int foo();
extern int bar(int = 0);
class Class {};

void top1() {
    if (foo() == 1) { // expected-note {{if condition here [loplugin:flatten]}}
        foo();
    } else {
        throw std::exception(); // expected-error {{unconditional throw in else branch, rather invert the condition, throw early, and flatten the normal case [loplugin:flatten]}}
    }
    if (foo() == 1) {
        Class aClass;
        (void)aClass;
    } else {
        throw std::exception(); // no warning expected
    }
    if (foo() == 1) { // expected-note {{if condition here [loplugin:flatten]}}
        Class aClass;
        (void)aClass;
    } else {
        throw std::exception(); // expected-error {{unconditional throw in else branch, rather invert the condition, throw early, and flatten the normal case [loplugin:flatten]}}
    }
}

void top2() {
    if (foo() == 2) {
        throw std::exception(); // expected-error {{unconditional throw in then branch, just flatten the else [loplugin:flatten]}}
    } else {
        foo();
    }
    if (foo() == 2) {
        throw std::exception(); // no warning expected
    } else {
        Class aClass;
        (void)aClass;
    }
    if (foo() == 2) {
        throw std::exception(); // expected-error {{unconditional throw in then branch, just flatten the else [loplugin:flatten]}}
    } else {
        Class aClass;
        (void)aClass;
    }
}

void top3() {
    // no warning expected
    if (foo() == 2) {
        throw std::exception();
    } else {
        Class aClass;
        (void)aClass;
    }
    int x = 1;
    (void)x;
}

void top4() {
    // no warning expected
    if (foo() == 2) {
        Class aClass;
        (void)aClass;
    } else {
        throw std::exception();
    }
    int x = 1;
    (void)x;
}

void top5() {
#if 1
    if (foo() == 2) {
        if (foo() == 3) { // expected-note {{if condition here [loplugin:flatten]}}
            bar();
        } else {
            throw std::exception(); // expected-error {{unconditional throw in else branch, rather invert the condition, throw early, and flatten the normal case [loplugin:flatten]}}
        }
    } else
#endif
        throw std::exception(); // no warning expected
}

int main() {
    // no warning expected
    if (bar() == 3) {
        throw std::exception();
    } else {
        throw std::exception();
    }
}

void top6() {
    // no warning expected
    if (foo() == 2) {
        Class aClass;
        (void)aClass;
    } else if (foo() == 2) {
        Class aClass;
        (void)aClass;
    } else {
        throw std::exception();
    }
    int x = 1;
    (void)x;
}

void top7() {
    // no warning expected
    if (foo() == 1) {
        throw std::exception();
    } else if (foo() == 2) {
        throw std::exception();
    } else {
        throw std::exception();
    }
}

void top8() {
    if (foo() == 1) {
        if (foo() == 2) {
            throw std::exception(); // expected-error {{unconditional throw in then branch, just flatten the else [loplugin:flatten]}}
        } else {
            bar();
        }
    } else if (foo() == 2) {
        bar(1);
    } else {
        bar(2);
    }
}

void top9() {
    if (foo() == 1) { // expected-error {{large if statement at end of function, rather invert the condition and exit early, and flatten the function [loplugin:flatten]}}
        Class aClass1;
        (void)aClass1;
        Class aClass2;
        (void)aClass2;
        Class aClass3;
        (void)aClass3;
        Class aClass4;
        (void)aClass4;
        Class aClass5;
        (void)aClass5;
        Class aClass6;
        (void)aClass6;
    }
}

void top10() {
    // no warning expected
    if (foo() == 2) {
        if (foo() == 1) {
            Class aClass1;
            (void)aClass1;
            Class aClass2;
            (void)aClass2;
            Class aClass3;
            (void)aClass3;
        }
    }
}

int top11() {
    // no warning expected
    if (foo() == 1) {
        Class aClass1;
        (void)aClass1;
        Class aClass2;
        (void)aClass2;
        Class aClass3;
        (void)aClass3;
        Class aClass4;
        (void)aClass4;
        Class aClass5;
        (void)aClass5;
        Class aClass6;
        (void)aClass6;
    }
    return 1;
}
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