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Diffstat (limited to 'clang/test/Sema/parentheses.c')
| -rw-r--r-- | clang/test/Sema/parentheses.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/clang/test/Sema/parentheses.c b/clang/test/Sema/parentheses.c new file mode 100644 index 0000000..9751336 --- /dev/null +++ b/clang/test/Sema/parentheses.c @@ -0,0 +1,73 @@ +// RUN: %clang_cc1 -Wparentheses -fsyntax-only -verify %s +// RUN: %clang_cc1 -Wparentheses -fixit %s -o - | %clang_cc1 -Wparentheses -Werror - + +// Test the various warnings under -Wparentheses +void if_assign(void) { + int i; + if (i = 4) {} // expected-warning {{assignment as a condition}} \ + // expected-note{{use '==' to turn this assignment into an equality comparison}} \ + // expected-note{{place parentheses around the assignment to silence this warning}} + if ((i = 4)) {} +} + +void bitwise_rel(unsigned i) { + (void)(i & 0x2 == 0); // expected-warning {{& has lower precedence than ==}} \ + // expected-note{{place parentheses around the & expression to evaluate it first}} \ + // expected-note{{place parentheses around the == expression to silence this warning}} + (void)(0 == i & 0x2); // expected-warning {{& has lower precedence than ==}} \ + // expected-note{{place parentheses around the & expression to evaluate it first}} \ + // expected-note{{place parentheses around the == expression to silence this warning}} + (void)(i & 0xff < 30); // expected-warning {{& has lower precedence than <}} \ + // expected-note{{place parentheses around the & expression to evaluate it first}} \ + // expected-note{{place parentheses around the < expression to silence this warning}} + (void)((i & 0x2) == 0); + (void)(i & (0x2 == 0)); + // Eager logical op + (void)(i == 1 | i == 2 | i == 3); + (void)(i != 1 & i != 2 & i != 3); + + (void)(i & i | i); // expected-warning {{'&' within '|'}} \ + // expected-note {{place parentheses around the '&' expression to silence this warning}} + + (void)(i | i & i); // expected-warning {{'&' within '|'}} \ + // expected-note {{place parentheses around the '&' expression to silence this warning}} + + (void)(i || + i && i); // expected-warning {{'&&' within '||'}} \ + // expected-note {{place parentheses around the '&&' expression to silence this warning}} + (void)(i || i && "w00t"); // no warning. + (void)("w00t" && i || i); // no warning. + (void)(i || i && "w00t" || i); // expected-warning {{'&&' within '||'}} \ + // expected-note {{place parentheses around the '&&' expression to silence this warning}} + (void)(i || "w00t" && i || i); // expected-warning {{'&&' within '||'}} \ + // expected-note {{place parentheses around the '&&' expression to silence this warning}} + (void)(i && i || 0); // no warning. + (void)(0 || i && i); // no warning. +} + +_Bool someConditionFunc(); + +void conditional_op(int x, int y, _Bool b) { + (void)(x + someConditionFunc() ? 1 : 2); // expected-warning {{operator '?:' has lower precedence than '+'}} \ + // expected-note {{place parentheses around the '?:' expression to evaluate it first}} \ + // expected-note {{place parentheses around the '+' expression to silence this warning}} + + (void)((x + someConditionFunc()) ? 1 : 2); // no warning + + (void)(x - b ? 1 : 2); // expected-warning {{operator '?:' has lower precedence than '-'}} \ + // expected-note {{place parentheses around the '?:' expression to evaluate it first}} \ + // expected-note {{place parentheses around the '-' expression to silence this warning}} + + (void)(x * (x == y) ? 1 : 2); // expected-warning {{operator '?:' has lower precedence than '*'}} \ + // expected-note {{place parentheses around the '?:' expression to evaluate it first}} \ + // expected-note {{place parentheses around the '*' expression to silence this warning}} + + (void)(x / !x ? 1 : 2); // expected-warning {{operator '?:' has lower precedence than '/'}} \ + // expected-note {{place parentheses around the '?:' expression to evaluate it first}} \ + // expected-note {{place parentheses around the '/' expression to silence this warning}} + + (void)(x % 2 ? 1 : 2); // no warning +} + +// RUN: %clang_cc1 -fsyntax-only -Wparentheses -Werror -fdiagnostics-show-option %s 2>&1 | FileCheck %s +// CHECK: error: using the result of an assignment as a condition without parentheses [-Werror,-Wparentheses] |