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// RUN: %clang_cc1 -verify -fsyntax-only -triple x86_64-pc-linux-gnu %s -Wno-literal-conversion -Wfloat-conversion -DFLOAT_CONVERSION -DZERO -DBOOL -DCONSTANT_BOOL -DOVERFLOW
// RUN: %clang_cc1 -verify -fsyntax-only -triple x86_64-pc-linux-gnu %s -Wno-conversion -Wfloat-overflow-conversion -DOVERFLOW
// RUN: %clang_cc1 -verify -fsyntax-only -triple x86_64-pc-linux-gnu %s -Wno-conversion -Wfloat-zero-conversion -DZERO
float ReturnFloat();
#ifdef FLOAT_CONVERSION
bool ReturnBool(float f) {
return f; //expected-warning{{conversion}}
}
char ReturnChar(float f) {
return f; //expected-warning{{conversion}}
}
int ReturnInt(float f) {
return f; //expected-warning{{conversion}}
}
long ReturnLong(float f) {
return f; //expected-warning{{conversion}}
}
void Convert(float f, double d, long double ld) {
bool b;
char c;
int i;
long l;
b = f; //expected-warning{{conversion}}
b = d; //expected-warning{{conversion}}
b = ld; //expected-warning{{conversion}}
c = f; //expected-warning{{conversion}}
c = d; //expected-warning{{conversion}}
c = ld; //expected-warning{{conversion}}
i = f; //expected-warning{{conversion}}
i = d; //expected-warning{{conversion}}
i = ld; //expected-warning{{conversion}}
l = f; //expected-warning{{conversion}}
l = d; //expected-warning{{conversion}}
l = ld; //expected-warning{{conversion}}
}
void CompoundAssignment() {
int x = 3;
x += 1.234; // expected-warning {{implicit conversion turns floating-point number into integer: 'double' to 'int'}}
x -= -0.0; // expected-warning {{implicit conversion turns floating-point number into integer: 'double' to 'int'}}
x *= 1.1f; // expected-warning {{implicit conversion turns floating-point number into integer: 'float' to 'int'}}
x /= -2.2f; // expected-warning {{implicit conversion turns floating-point number into integer: 'float' to 'int'}}
int y = x += 1.4f; // expected-warning {{implicit conversion turns floating-point number into integer: 'float' to 'int'}}
float z = 1.1f;
double w = -2.2;
y += z + w; // expected-warning {{implicit conversion turns floating-point number into integer: 'double' to 'int'}}
}
# 1 "foo.h" 3
// ^ the following text comes from a system header file.
#define SYSTEM_MACRO_FLOAT(x) do { (x) += 1.1; } while(0)
# 1 "warn-float-conversion.cpp" 1
// ^ start of a new file.
void SystemMacro() {
float x = 0.0f;
SYSTEM_MACRO_FLOAT(x);
}
void Test() {
int a1 = 10.0/2.0; //expected-warning{{conversion}}
int a2 = 1.0/2.0; //expected-warning{{conversion}}
bool a3 = ReturnFloat(); //expected-warning{{conversion}}
int a4 = 1e30 + 1; //expected-warning{{conversion}}
}
void TestConstantFloat() {
// Don't warn on exact floating literals.
int a1 = 5.0;
int a2 = 1e3;
int a3 = 5.5; // caught by -Wliteral-conversion
int a4 = 500.44; // caught by -Wliteral-convserion
int b1 = 5.0 / 1.0; //expected-warning{{conversion}}
int b2 = 5.0 / 2.0; //expected-warning{{conversion}}
const float five = 5.0;
int b3 = five / 1.0; //expected-warning{{conversion}}
int b4 = five / 2.0; //expected-warning{{conversion}}
int f = 2147483646.5 + 1; // expected-warning{{implicit conversion from 'double' to 'int' changes value from 2147483647.5 to 2147483647}}
unsigned g = -.5 + .01; // expected-warning{{implicit conversion from 'double' to 'unsigned int' changes non-zero value from -0.49 to 0}}
}
#endif // FLOAT_CONVERSION
#ifdef ZERO
void TestZero() {
const float half = .5;
int a1 = half; // expected-warning{{implicit conversion from 'const float' to 'int' changes non-zero value from 0.5 to 0}}
int a2 = 1.0 / 2.0; // expected-warning{{implicit conversion from 'double' to 'int' changes non-zero value from 0.5 to 0}}
int a3 = 5;
}
#endif // ZERO
#ifdef OVERFLOW
void TestOverflow() {
char a = 500.0; // caught by -Wliteral-conversion
char b = -500.0; // caught by -Wliteral-conversion
const float LargeNumber = 1024;
char c = LargeNumber; // expected-warning{{implicit conversion of out of range value from 'const float' to 'char' is undefined}}
char d = 400.0 + 400.0; // expected-warning{{implicit conversion of out of range value from 'double' to 'char' is undefined}}
char e = 1.0 / 0.0; // expected-warning{{implicit conversion of out of range value from 'double' to 'char' is undefined}}
}
template <typename T>
class Check {
public:
static constexpr bool Safe();
};
template<>
constexpr bool Check<char>::Safe() { return false; }
template<>
constexpr bool Check<float>::Safe() { return true; }
template <typename T>
T run1(T t) {
const float ret = 800;
return ret; // expected-warning {{implicit conversion of out of range value from 'const float' to 'char' is undefined}}
}
template <typename T>
T run2(T t) {
const float ret = 800;
if (Check<T>::Safe())
return ret;
else
return t;
}
void test() {
float a = run1(a) + run2(a);
char b = run1(b) + run2(b); // expected-note {{in instantiation of function template specialization 'run1<char>' requested here}}
}
#endif // OVERFLOW
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