122 lines
7.1 KiB
C
122 lines
7.1 KiB
C
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// RUN: %clang_cc1 -fsyntax-only -verify %s
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// RUN: %clang_cc1 -Wparentheses -fsyntax-only -verify %s
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// RUN: %clang_cc1 -Wparentheses -fsyntax-only -fdiagnostics-parseable-fixits %s 2>&1 | FileCheck %s
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// Test the various warnings under -Wparentheses
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void if_assign(void) {
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int i;
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if (i = 4) {} // expected-warning {{assignment as a condition}} \
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// expected-note{{place parentheses around the assignment to silence this warning}} \
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// expected-note{{use '==' to turn this assignment into an equality comparison}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:7-[[@LINE-3]]:7}:"("
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:12-[[@LINE-4]]:12}:")"
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// CHECK: fix-it:"{{.*}}":{[[@LINE-5]]:9-[[@LINE-5]]:10}:"=="
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if ((i = 4)) {}
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}
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void bitwise_rel(unsigned i) {
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(void)(i & 0x2 == 0); // expected-warning {{& has lower precedence than ==}} \
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// expected-note{{place parentheses around the '==' expression to silence this warning}} \
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// expected-note{{place parentheses around the & expression to evaluate it first}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:14-[[@LINE-3]]:14}:"("
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:22-[[@LINE-4]]:22}:")"
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// CHECK: fix-it:"{{.*}}":{[[@LINE-5]]:10-[[@LINE-5]]:10}:"("
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// CHECK: fix-it:"{{.*}}":{[[@LINE-6]]:17-[[@LINE-6]]:17}:")"
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(void)(0 == i & 0x2); // expected-warning {{& has lower precedence than ==}} \
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// expected-note{{place parentheses around the '==' expression to silence this warning}} \
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// expected-note{{place parentheses around the & expression to evaluate it first}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:10-[[@LINE-3]]:10}:"("
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:16-[[@LINE-4]]:16}:")"
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// CHECK: fix-it:"{{.*}}":{[[@LINE-5]]:15-[[@LINE-5]]:15}:"("
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// CHECK: fix-it:"{{.*}}":{[[@LINE-6]]:22-[[@LINE-6]]:22}:")"
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(void)(i & 0xff < 30); // expected-warning {{& has lower precedence than <}} \
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// expected-note{{place parentheses around the '<' expression to silence this warning}} \
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// expected-note{{place parentheses around the & expression to evaluate it first}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:14-[[@LINE-3]]:14}:"("
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:23-[[@LINE-4]]:23}:")"
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// CHECK: fix-it:"{{.*}}":{[[@LINE-5]]:10-[[@LINE-5]]:10}:"("
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// CHECK: fix-it:"{{.*}}":{[[@LINE-6]]:18-[[@LINE-6]]:18}:")"
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(void)((i & 0x2) == 0);
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(void)(i & (0x2 == 0));
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// Eager logical op
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(void)(i == 1 | i == 2 | i == 3);
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(void)(i != 1 & i != 2 & i != 3);
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}
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_Bool someConditionFunc();
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void conditional_op(int x, int y, _Bool b, void* p) {
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(void)(x + someConditionFunc() ? 1 : 2); // expected-warning {{operator '?:' has lower precedence than '+'}} \
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// expected-note {{place parentheses around the '+' expression to silence this warning}} \
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// expected-note {{place parentheses around the '?:' expression to evaluate it first}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:10-[[@LINE-3]]:10}:"("
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:33-[[@LINE-4]]:33}:")"
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// CHECK: fix-it:"{{.*}}":{[[@LINE-5]]:14-[[@LINE-5]]:14}:"("
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// CHECK: fix-it:"{{.*}}":{[[@LINE-6]]:41-[[@LINE-6]]:41}:")"
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(void)((x + someConditionFunc()) ? 1 : 2); // no warning
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(void)(x - b ? 1 : 2); // expected-warning {{operator '?:' has lower precedence than '-'}} \
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// expected-note {{place parentheses around the '-' expression to silence this warning}} \
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// expected-note {{place parentheses around the '?:' expression to evaluate it first}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:10-[[@LINE-3]]:10}:"("
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:15-[[@LINE-4]]:15}:")"
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// CHECK: fix-it:"{{.*}}":{[[@LINE-5]]:14-[[@LINE-5]]:14}:"("
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// CHECK: fix-it:"{{.*}}":{[[@LINE-6]]:23-[[@LINE-6]]:23}:")"
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(void)(x * (x == y) ? 1 : 2); // expected-warning {{operator '?:' has lower precedence than '*'}} \
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// expected-note {{place parentheses around the '*' expression to silence this warning}} \
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// expected-note {{place parentheses around the '?:' expression to evaluate it first}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:10-[[@LINE-3]]:10}:"("
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:22-[[@LINE-4]]:22}:")"
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// CHECK: fix-it:"{{.*}}":{[[@LINE-5]]:14-[[@LINE-5]]:14}:"("
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// CHECK: fix-it:"{{.*}}":{[[@LINE-6]]:30-[[@LINE-6]]:30}:")"
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(void)(x / !x ? 1 : 2); // expected-warning {{operator '?:' has lower precedence than '/'}} \
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// expected-note {{place parentheses around the '/' expression to silence this warning}} \
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// expected-note {{place parentheses around the '?:' expression to evaluate it first}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:10-[[@LINE-3]]:10}:"("
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:16-[[@LINE-4]]:16}:")"
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// CHECK: fix-it:"{{.*}}":{[[@LINE-5]]:14-[[@LINE-5]]:14}:"("
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// CHECK: fix-it:"{{.*}}":{[[@LINE-6]]:24-[[@LINE-6]]:24}:")"
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(void)(x % 2 ? 1 : 2); // no warning
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(void)(x + p ? 1 : 2); // expected-warning {{operator '?:' has lower precedence than '+'}} expected-note 2{{place parentheses}}
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(void)(p + x ? 1 : 2); // no warning
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(void)(p + b ? 1 : 2); // expected-warning {{operator '?:' has lower precedence than '+'}} expected-note 2{{place parentheses}}
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(void)(x + y > 0 ? 1 : 2); // no warning
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(void)(x + (y > 0) ? 1 : 2); // expected-warning {{operator '?:' has lower precedence than '+'}} expected-note 2{{place parentheses}}
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(void)(b ? 0xf0 : 0x10 | b ? 0x5 : 0x2); // expected-warning {{operator '?:' has lower precedence than '|'}} expected-note 2{{place parentheses}}
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(void)((b ? 0xf0 : 0x10) | (b ? 0x5 : 0x2)); // no warning, has parentheses
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(void)(b ? 0xf0 : (0x10 | b) ? 0x5 : 0x2); // no warning, has parentheses
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(void)(x | b ? 1 : 2); // expected-warning {{operator '?:' has lower precedence than '|'}} expected-note 2{{place parentheses}}
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(void)(x & b ? 1 : 2); // expected-warning {{operator '?:' has lower precedence than '&'}} expected-note 2{{place parentheses}}
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(void)((x | b) ? 1 : 2); // no warning, has parentheses
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(void)(x | (b ? 1 : 2)); // no warning, has parentheses
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(void)((x & b) ? 1 : 2); // no warning, has parentheses
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(void)(x & (b ? 1 : 2)); // no warning, has parentheses
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// Only warn on uses of the bitwise operators, and not the logical operators.
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// The bitwise operators are more likely to be bugs while the logical
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// operators are more likely to be used correctly. Since there is no
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// explicit logical-xor operator, the bitwise-xor is commonly used instead.
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// For this warning, treat the bitwise-xor as if it were a logical operator.
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(void)(x ^ b ? 1 : 2); // no warning, ^ is often used as logical xor
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(void)(x || b ? 1 : 2); // no warning, logical operator
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(void)(x && b ? 1 : 2); // no warning, logical operator
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}
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// RUN: not %clang_cc1 -fsyntax-only -Wparentheses -Werror %s 2>&1 | FileCheck %s -check-prefix=CHECK-FLAG
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// CHECK-FLAG: error: using the result of an assignment as a condition without parentheses [-Werror,-Wparentheses]
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