1 // RUN: %clang_cc1 -fsyntax-only -Wliteral-conversion -verify %s
2
3 void foo(int y);
4
5 // Warn when a literal float or double is assigned or bound to an integer.
test0()6 void test0() {
7 // Float
8 int y0 = 1.2222F; // expected-warning {{implicit conversion from 'float' to 'int' changes value from 1.2222 to 1}}
9 int y1 = (1.2222F); // expected-warning {{implicit conversion from 'float' to 'int' changes value from 1.2222 to 1}}
10 int y2 = (((1.2222F))); // expected-warning {{implicit conversion from 'float' to 'int' changes value from 1.2222 to 1}}
11 int y3 = 12E-1F; // expected-warning {{implicit conversion from 'float' to 'int' changes value from 1.2 to 1}}
12 int y4 = 1.23E1F; // expected-warning {{implicit conversion from 'float' to 'int' changes value from 12.3 to 12}}
13 // Double
14 int y5 = 1.2222; // expected-warning {{implicit conversion from 'double' to 'int' changes value from 1.2222 to 1}}
15 int y6 = 12E-1; // expected-warning {{implicit conversion from 'double' to 'int' changes value from 1.2 to 1}}
16 int y7 = 1.23E1; // expected-warning {{implicit conversion from 'double' to 'int' changes value from 12.3 to 12}}
17 int y8 = (1.23E1); // expected-warning {{implicit conversion from 'double' to 'int' changes value from 12.3 to 12}}
18
19 // Test assignment to an existing variable.
20 y8 = 2.22F; // expected-warning {{implicit conversion from 'float' to 'int' changes value from 2.22 to 2}}
21
22 // Test direct initialization.
23 int y9(1.23F); // expected-warning {{implicit conversion from 'float' to 'int' changes value from 1.23 to 1}}
24
25 // Test passing a literal floating-point value to a function that takes an integer.
26 foo(1.2F); // expected-warning {{implicit conversion from 'float' to 'int' changes value from 1.2 to 1}}
27
28 int y10 = -1.2F; // expected-warning {{implicit conversion from 'float' to 'int' changes value from -1.2 to -1}}
29
30 // -Wliteral-conversion does NOT catch const values.
31 // (-Wconversion DOES catch them.)
32 static const float sales_tax_rate = .095F;
33 int z = sales_tax_rate;
34 foo(sales_tax_rate);
35
36 // Expressions, such as those that indicate rounding-down, should NOT produce warnings.
37 int x = 24 * 0.5;
38 int y = (24*60*60) * 0.25;
39 int pennies = 123.45 * 100;
40 }
41
42 // Similarly, test floating point conversion to bool. Only float values of zero
43 // are converted to false; everything else is converted to true.
test1()44 void test1() {
45 bool b1 = 0.99f; // expected-warning {{implicit conversion from 'float' to 'bool' changes value from 0.99 to true}}
46 bool b2 = 0.99; // expected-warning {{implicit conversion from 'double' to 'bool' changes value from 0.99 to true}}
47 // These do not warn because they can be directly converted to integral
48 // values.
49 bool b3 = 0.0f;
50 bool b4 = 0.0;
51 }
52