compilerplugins/clang/test/casttovoid.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  */
   9
  10 #undef NDEBUG
  11 #include <cassert>
  12
  13 #define CAST_N3 (void) n3
  14 #define ASSERT_N4 assert(n4 == 0)
  15 #define ASSERT(x) assert(x)
  16 #define USE(x) x
  17
  18 int f1(int n1, int n2, int n3, int n4, int n5) {
  19     (void) n1; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
  20     int const & r1 = n1; // expected-note {{first consumption is here [loplugin:casttovoid]}}
  21     (void) n2; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
  22     int const & r2 = {n2}; // expected-note {{first consumption is here [loplugin:casttovoid]}}
  23     (void) n3; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
  24     int const & r3{n3}; // expected-note {{first consumption is here [loplugin:casttovoid]}}
  25     (void) n4; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
  26     int const & r4(n4); // expected-note {{first consumption is here [loplugin:casttovoid]}}
  27     (void) n5; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
  28     int const & r5 = (n5); // expected-note {{first consumption is here [loplugin:casttovoid]}}
  29     return r1 + r2 + r3 + r4 + r5;
  30 }
  31
  32 int const & f2(int const & n) {
  33     (void) n; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
  34     return n; // expected-note {{first consumption is here [loplugin:casttovoid]}}
  35 }
  36
  37 int const & f3(int const & n) {
  38     (void) n; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
  39     return (n); // expected-note {{first consumption is here [loplugin:casttovoid]}}
  40 }
  41
  42 int const & f4(int const & n) {
  43     (void) n; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
  44     return {n}; // expected-note {{first consumption is here [loplugin:casttovoid]}}
  45 }
  46
  47 int const & f5(int const & n) {
  48     (void) n; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
  49     return {(n)}; // expected-note {{first consumption is here [loplugin:casttovoid]}}
  50 }
  51
  52 struct S1 {
  53     S1(int n1, int n2):
  54         n1_(n1), // expected-note {{first consumption is here [loplugin:casttovoid]}}
  55         n2_{n2} // expected-note {{first consumption is here [loplugin:casttovoid]}}
  56     {
  57         (void) n1; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
  58         (void) n2; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
  59     }
  60     int const n1_;
  61     int const n2_;
  62 };
  63
  64 struct S2 { int n; };
  65
  66 int fS2_1(S2 s) {
  67     (void) s; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
  68     return s.n; // expected-note {{first consumption is here [loplugin:casttovoid]}}
  69 }
  70
  71 int const & fS2_2(S2 const & s) {
  72     (void) s; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
  73     return s.n; // expected-note {{first consumption is here [loplugin:casttovoid]}}
  74 }
  75
  76 // Don't trigger assert in CastToVoid::VisitReturnStmt:
  77 int n = [] { return 0; }();
  78
  79 int f() {
  80     int n1 = n;
  81     int n2 = [](int const & n) -> int const & {
  82         (void) n; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
  83         return n; // expected-note {{first consumption is here [loplugin:casttovoid]}}
  84     }(n1);
  85     return n2;
  86 }
  87
  88 int main() {
  89     int n1 = 0;
  90     (void) n1; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
  91     (void const) n1; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
  92     (void volatile) n1; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
  93     (void const volatile) n1; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
  94     (void) (n1); // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
  95     (void) ((n1)); // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
  96     (void(n1)); // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
  97     static_cast<void>(n1); // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
  98     int n2 = 0;
  99     assert(n2 == 0);
 100     (void) n2; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
 101     int n3 = 0;
 102     CAST_N3;
 103     int n4 = 0;
 104     ASSERT_N4;
 105     (void) n4;
 106     int n5 = 0;
 107     assert(n5 == 0);
 108     (void) n5;
 109     int n6 = 0;
 110     ASSERT(n6 == 0);
 111     (void) n6;
 112     int n7 = 0;
 113     assert(USE(n7) == 0);
 114     (void) n7;
 115     int n8 = 0;
 116     ASSERT(USE(USE(n8 == 0)));
 117     (void) n8;
 118     int volatile n9 = 0;
 119     (void) n9;
 120     return n1 // expected-note 8 {{first consumption is here [loplugin:casttovoid]}}
 121         + n2 // expected-note {{first consumption is here [loplugin:casttovoid]}}
 122         + n3;
 123 }
 124
 125 /* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */