test/Sema/parentheses.c

   1 // RUN: %clang_cc1 -Wparentheses -fsyntax-only -verify %s
   2 // RUN: %clang_cc1 -Wparentheses -fixit %s -o - | %clang_cc1 -Wparentheses -Werror -
   3
   4 // Test the various warnings under -Wparentheses
   5 void if_assign(void) {
   6   int i;
   7   if (i = 4) {} // expected-warning {{assignment as a condition}} \
   8                 // expected-note{{use '==' to turn this assignment into an equality comparison}} \
   9   // expected-note{{place parentheses around the assignment to silence this warning}}
  10   if ((i = 4)) {}
  11 }
  12
  13 void bitwise_rel(unsigned i) {
  14   (void)(i & 0x2 == 0); // expected-warning {{& has lower precedence than ==}} \
  15                         // expected-note{{place parentheses around the & expression to evaluate it first}} \
  16   // expected-note{{place parentheses around the == expression to silence this warning}}
  17   (void)(0 == i & 0x2); // expected-warning {{& has lower precedence than ==}} \
  18                         // expected-note{{place parentheses around the & expression to evaluate it first}} \
  19   // expected-note{{place parentheses around the == expression to silence this warning}}
  20   (void)(i & 0xff < 30); // expected-warning {{& has lower precedence than <}} \
  21                         // expected-note{{place parentheses around the & expression to evaluate it first}} \
  22   // expected-note{{place parentheses around the < expression to silence this warning}}
  23   (void)((i & 0x2) == 0);
  24   (void)(i & (0x2 == 0));
  25   // Eager logical op
  26   (void)(i == 1 | i == 2 | i == 3);
  27   (void)(i != 1 & i != 2 & i != 3);
  28
  29   (void)(i || i && i); // expected-warning {{'&&' within '||'}} \
  30                        // expected-note {{place parentheses around the '&&' expression to silence this warning}}
  31   (void)(i || i && "w00t"); // no warning.
  32   (void)("w00t" && i || i); // no warning.
  33   (void)(i || i && "w00t" || i); // expected-warning {{'&&' within '||'}} \
  34                                  // expected-note {{place parentheses around the '&&' expression to silence this warning}}
  35   (void)(i || "w00t" && i || i); // expected-warning {{'&&' within '||'}} \
  36                                  // expected-note {{place parentheses around the '&&' expression to silence this warning}}
  37   (void)(i && i || 0); // no warning.
  38   (void)(0 || i && i); // no warning.
  39 }