63 lines
3.5 KiB
C++
63 lines
3.5 KiB
C++
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// RUN: %clang_cc1 -fsyntax-only -Wliteral-conversion -verify %s
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void foo(int y);
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// Warn when a literal float or double is assigned or bound to an integer.
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void test0() {
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// Float
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int y0 = 1.2222F; // expected-warning {{implicit conversion from 'float' to 'int' changes value from 1.2222 to 1}}
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int y1 = (1.2222F); // expected-warning {{implicit conversion from 'float' to 'int' changes value from 1.2222 to 1}}
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int y2 = (((1.2222F))); // expected-warning {{implicit conversion from 'float' to 'int' changes value from 1.2222 to 1}}
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int y3 = 12E-1F; // expected-warning {{implicit conversion from 'float' to 'int' changes value from 1.2 to 1}}
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int y4 = 1.23E1F; // expected-warning {{implicit conversion from 'float' to 'int' changes value from 12.3 to 12}}
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// Double
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int y5 = 1.2222; // expected-warning {{implicit conversion from 'double' to 'int' changes value from 1.2222 to 1}}
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int y6 = 12E-1; // expected-warning {{implicit conversion from 'double' to 'int' changes value from 1.2 to 1}}
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int y7 = 1.23E1; // expected-warning {{implicit conversion from 'double' to 'int' changes value from 12.3 to 12}}
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int y8 = (1.23E1); // expected-warning {{implicit conversion from 'double' to 'int' changes value from 12.3 to 12}}
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// Test assignment to an existing variable.
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y8 = 2.22F; // expected-warning {{implicit conversion from 'float' to 'int' changes value from 2.22 to 2}}
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// Test direct initialization.
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int y9(1.23F); // expected-warning {{implicit conversion from 'float' to 'int' changes value from 1.23 to 1}}
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// Test passing a literal floating-point value to a function that takes an integer.
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foo(1.2F); // expected-warning {{implicit conversion from 'float' to 'int' changes value from 1.2 to 1}}
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int y10 = -1.2F; // expected-warning {{implicit conversion from 'float' to 'int' changes value from -1.2 to -1}}
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// -Wliteral-conversion does NOT catch const values.
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// (-Wconversion DOES catch them.)
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static const float sales_tax_rate = .095F;
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int z = sales_tax_rate;
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foo(sales_tax_rate);
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// Expressions, such as those that indicate rounding-down, should NOT produce warnings.
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int x = 24 * 0.5;
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int y = (24*60*60) * 0.25;
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int pennies = 123.45 * 100;
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}
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// Similarly, test floating point conversion to bool. Only float values of zero
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// are converted to false; everything else is converted to true.
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void test1() {
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bool b1 = 0.99f; // expected-warning {{implicit conversion from 'float' to 'bool' changes value from 0.99 to true}}
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bool b2 = 0.99; // expected-warning {{implicit conversion from 'double' to 'bool' changes value from 0.99 to true}}
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// These do not warn because they can be directly converted to integral
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// values.
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bool b3 = 0.0f;
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bool b4 = 0.0;
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// These all warn because they overflow the target type.
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short s = 32768.0; // expected-warning{{implicit conversion of out of range value from 'double' to 'short' is undefined}}
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unsigned short us = 65536.0; // expected-warning{{implicit conversion of out of range value from 'double' to 'unsigned short' is undefined}}
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short s2 = -32769.0; // expected-warning{{implicit conversion of out of range value from 'double' to 'short' is undefined}}
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unsigned short us2 = -65537.0; // expected-warning{{implicit conversion of out of range value from 'double' to 'unsigned short' is undefined}}
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}
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int a() { return 2147483647.5; } // expected-warning{{implicit conversion from 'double' to 'int' changes value from 2147483647.5 to 2147483647}}
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unsigned b() { return -.5; } // expected-warning{{implicit conversion from 'double' to 'unsigned int' changes value from -0.5 to 0}}
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