signed-char-bool-conversion.m
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// RUN: %clang_cc1 %s -verify -Wobjc-signed-char-bool
// RUN: %clang_cc1 -xobjective-c++ %s -verify -Wobjc-signed-char-bool
typedef signed char BOOL;
#define YES __objc_yes
#define NO __objc_no
typedef unsigned char Boolean;
BOOL b;
Boolean boolean;
float fl;
int i;
int *ptr;
void t1() {
b = boolean;
b = fl; // expected-warning {{implicit conversion from floating-point type 'float' to 'BOOL'}}
b = i; // expected-warning {{implicit conversion from integral type 'int' to 'BOOL'}}
b = 1.0;
b = 0.0;
b = 1.1; // expected-warning {{implicit conversion from 'double' to 'BOOL' (aka 'signed char') changes value from 1.1 to 1}}
b = 2.1; // expected-warning {{implicit conversion from constant value 2.1 to 'BOOL'; the only well defined values for 'BOOL' are YES and NO}}
b = YES;
#ifndef __cplusplus
b = ptr; // expected-warning {{incompatible pointer to integer conversion assigning to 'BOOL' (aka 'signed char') from 'int *'}}
#endif
}
@interface BoolProp
@property BOOL p;
@end
void t2(BoolProp *bp) {
bp.p = YES;
bp.p = NO;
bp.p = boolean;
bp.p = fl; // expected-warning {{implicit conversion from floating-point type 'float' to 'BOOL'}}
bp.p = i; // expected-warning {{implicit conversion from integral type 'int' to 'BOOL'}}
bp.p = b;
bp.p = bp.p;
#ifndef __cplusplus
bp.p = ptr; // expected-warning {{incompatible pointer to integer conversion assigning to 'BOOL' (aka 'signed char') from 'int *'}}
#endif
bp.p = 1;
bp.p = 2; // expected-warning {{implicit conversion from constant value 2 to 'BOOL'; the only well defined values for 'BOOL' are YES and NO}}
}
struct has_bf {
int signed_bf1 : 1;
int signed_bf2 : 2;
unsigned unsigned_bf1 : 1;
unsigned unsigned_bf2 : 2;
struct has_bf *nested;
};
void t3(struct has_bf *bf) {
b = bf->signed_bf1; // expected-warning{{implicit conversion from integral type 'int' to 'BOOL'}}
b = bf->signed_bf2; // expected-warning{{implicit conversion from integral type 'int' to 'BOOL'}}
b = bf->unsigned_bf1; // no warning
b = bf->unsigned_bf2; // expected-warning{{implicit conversion from integral type 'unsigned int' to 'BOOL'}}
struct has_bf local;
b = local.unsigned_bf1;
b = local.unsigned_bf2; // expected-warning{{implicit conversion from integral type 'unsigned int' to 'BOOL'}}
b = local.nested->unsigned_bf1;
b = local.nested->unsigned_bf2; // expected-warning{{implicit conversion from integral type 'unsigned int' to 'BOOL'}}
}
void t4(BoolProp *bp) {
BOOL local = YES;
bp.p = 1 ? local : NO; // no warning
}
__attribute__((objc_root_class))
@interface BFIvar {
struct has_bf bf;
unsigned unsigned_bf1 : 1;
unsigned unsigned_bf2 : 2;
}
@end
@implementation BFIvar
-(void)m {
b = bf.unsigned_bf1;
b = bf.unsigned_bf2; // expected-warning{{implicit conversion from integral type 'unsigned int' to 'BOOL'}}
b = unsigned_bf1;
b = unsigned_bf2; // expected-warning{{implicit conversion from integral type 'unsigned int' to 'BOOL'}}
}
@end
#ifdef __cplusplus
template <class T>
struct S {
unsigned i : sizeof(T);
};
template <class T>
void f() {
S<T> i;
BOOL b = i.i; // expected-warning{{implicit conversion from integral type 'unsigned int' to 'BOOL'}}
}
int main() {
f<char>();
f<short>(); // expected-note {{in instantiation of function template specialization 'f<short>' requested here}}
}
#endif
void t5(BOOL b) {
int i;
b = b ?: YES; // no warning
b = b ?: i; // expected-warning {{implicit conversion from integral type 'int' to 'BOOL'}}
b = (b = i) // expected-warning {{implicit conversion from integral type 'int' to 'BOOL'}}
?: YES;
b = (1 ? YES : i) ?: YES; // expected-warning {{implicit conversion from integral type 'int' to 'BOOL'}}
b = b ?: (1 ? i : i); // expected-warning 2 {{implicit conversion from integral type 'int' to 'BOOL'}}
b = b ? YES : (i ?: 0); // expected-warning {{implicit conversion from integral type 'int' to 'BOOL'}}
}