forked from OSchip/llvm-project
347 lines
14 KiB
C++
347 lines
14 KiB
C++
// RUN: %check_clang_tidy %s cppcoreguidelines-narrowing-conversions %t \
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// RUN: -config="{CheckOptions: [ \
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// RUN: {key: "cppcoreguidelines-narrowing-conversions.WarnOnFloatingPointNarrowingConversion", value: 0}, \
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// RUN: ]}" \
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// RUN: -- -target x86_64-unknown-linux -fsigned-char
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float ceil(float);
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namespace std {
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double ceil(double);
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long double floor(long double);
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} // namespace std
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namespace floats {
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struct ConvertsToFloat {
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operator float() const { return 0.5f; }
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};
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float operator"" _float(unsigned long long);
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void narrow_fp_to_int_not_ok(double d) {
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int i = 0;
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i = d;
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// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from 'double' to 'int' [cppcoreguidelines-narrowing-conversions]
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i = 0.5f;
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// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from constant 'float' to 'int' [cppcoreguidelines-narrowing-conversions]
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i = static_cast<float>(d);
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// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from 'float' to 'int' [cppcoreguidelines-narrowing-conversions]
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i = ConvertsToFloat();
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// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from 'float' to 'int' [cppcoreguidelines-narrowing-conversions]
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i = 15_float;
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// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from 'float' to 'int' [cppcoreguidelines-narrowing-conversions]
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i += d;
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// CHECK-MESSAGES: :[[@LINE-1]]:8: warning: narrowing conversion from 'double' to 'int' [cppcoreguidelines-narrowing-conversions]
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i += 0.5;
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// CHECK-MESSAGES: :[[@LINE-1]]:8: warning: narrowing conversion from constant 'double' to 'int' [cppcoreguidelines-narrowing-conversions]
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i += 0.5f;
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// CHECK-MESSAGES: :[[@LINE-1]]:8: warning: narrowing conversion from constant 'float' to 'int' [cppcoreguidelines-narrowing-conversions]
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i *= 0.5f;
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// CHECK-MESSAGES: :[[@LINE-1]]:8: warning: narrowing conversion from constant 'float' to 'int' [cppcoreguidelines-narrowing-conversions]
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i /= 0.5f;
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// CHECK-MESSAGES: :[[@LINE-1]]:8: warning: narrowing conversion from constant 'float' to 'int' [cppcoreguidelines-narrowing-conversions]
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i += (double)0.5f;
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// CHECK-MESSAGES: :[[@LINE-1]]:8: warning: narrowing conversion from constant 'double' to 'int' [cppcoreguidelines-narrowing-conversions]
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i += 2.0;
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i += 2.0f;
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}
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double operator"" _double(unsigned long long);
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float narrow_double_to_float_return() {
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return 0.5; // [dcl.init.list] 7.2 : in-range fp constant to narrower float is not a narrowing.
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}
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void narrow_double_to_float_ok(double d) {
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float f;
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f = d;
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f = 15_double;
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}
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void narrow_fp_constants() {
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float f;
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f = 0.5; // [dcl.init.list] 7.2 : in-range fp constant to narrower float is not a narrowing.
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f = __builtin_huge_valf(); // max float is not narrowing.
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f = -__builtin_huge_valf(); // -max float is not narrowing.
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f = __builtin_inff(); // float infinity is not narrowing.
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f = __builtin_nanf("0"); // float NaN is not narrowing.
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f = __builtin_huge_val(); // max double is not within-range of float.
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f = -__builtin_huge_val(); // -max double is not within-range of float.
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f = __builtin_inf(); // double infinity is not within-range of float.
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f = __builtin_nan("0"); // double NaN is not narrowing.
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}
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void narrow_double_to_float_not_ok_binary_ops(double d) {
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float f;
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f += 0.5; // [dcl.init.list] 7.2 : in-range fp constant to narrower float is not a narrowing.
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f += 2.0; // [dcl.init.list] 7.2 : in-range fp constant to narrower float is not a narrowing.
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f *= 0.5; // [dcl.init.list] 7.2 : in-range fp constant to narrower float is not a narrowing.
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f /= 0.5; // [dcl.init.list] 7.2 : in-range fp constant to narrower float is not a narrowing.
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f += (double)0.5f; // [dcl.init.list] 7.2 : in-range fp constant to narrower float is not a narrowing.
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f += d; // We do not warn about floating point narrowing by default.
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}
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void narrow_fp_constant_to_bool_not_ok() {
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bool b1 = 1.0;
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// CHECK-MESSAGES: :[[@LINE-1]]:13: warning: narrowing conversion from constant 'double' to 'bool' [cppcoreguidelines-narrowing-conversions]
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bool b2 = 1.0f;
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// CHECK-MESSAGES: :[[@LINE-1]]:13: warning: narrowing conversion from constant 'float' to 'bool' [cppcoreguidelines-narrowing-conversions]
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}
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void narrow_integer_to_floating() {
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{
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long long ll; // 64 bits
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float f = ll; // doesn't fit in 24 bits
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// CHECK-MESSAGES: :[[@LINE-1]]:15: warning: narrowing conversion from 'long long' to 'float' [cppcoreguidelines-narrowing-conversions]
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double d = ll; // doesn't fit in 53 bits.
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// CHECK-MESSAGES: :[[@LINE-1]]:16: warning: narrowing conversion from 'long long' to 'double' [cppcoreguidelines-narrowing-conversions]
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}
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{
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int i; // 32 bits
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float f = i; // doesn't fit in 24 bits
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// CHECK-MESSAGES: :[[@LINE-1]]:15: warning: narrowing conversion from 'int' to 'float' [cppcoreguidelines-narrowing-conversions]
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double d = i; // fits in 53 bits.
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}
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{
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short n1, n2;
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float f = n1 + n2; // 'n1 + n2' is of type 'int' because of integer rules
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// CHECK-MESSAGES: :[[@LINE-1]]:15: warning: narrowing conversion from 'int' to 'float' [cppcoreguidelines-narrowing-conversions]
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}
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{
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short s; // 16 bits
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float f = s; // fits in 24 bits
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double d = s; // fits in 53 bits.
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}
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}
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void narrow_integer_to_unsigned_integer_is_ok() {
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char c;
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short s;
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int i;
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long l;
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long long ll;
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unsigned char uc;
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unsigned short us;
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unsigned int ui;
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unsigned long ul;
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unsigned long long ull;
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ui = c;
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uc = s;
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uc = i;
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uc = l;
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uc = ll;
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uc = uc;
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uc = us;
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uc = ui;
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uc = ul;
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uc = ull;
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}
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void narrow_integer_to_signed_integer_is_not_ok() {
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char c;
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short s;
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int i;
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long l;
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long long ll;
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unsigned char uc;
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unsigned short us;
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unsigned int ui;
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unsigned long ul;
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unsigned long long ull;
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c = c;
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c = s;
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// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from 'short' to signed type 'char' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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c = i;
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// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from 'int' to signed type 'char' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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c = l;
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// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from 'long' to signed type 'char' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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c = ll;
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// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from 'long long' to signed type 'char' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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c = uc;
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// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from 'unsigned char' to signed type 'char' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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c = us;
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// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from 'unsigned short' to signed type 'char' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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c = ui;
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// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from 'unsigned int' to signed type 'char' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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c = ul;
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// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from 'unsigned long' to signed type 'char' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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c = ull;
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// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from 'unsigned long long' to signed type 'char' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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i = c;
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i = s;
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i = i;
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i = l;
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// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from 'long' to signed type 'int' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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i = ll;
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// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from 'long long' to signed type 'int' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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i = uc;
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i = us;
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i = ui;
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// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from 'unsigned int' to signed type 'int' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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i = ul;
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// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from 'unsigned long' to signed type 'int' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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i = ull;
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// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from 'unsigned long long' to signed type 'int' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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ll = c;
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ll = s;
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ll = i;
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ll = l;
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ll = ll;
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ll = uc;
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ll = us;
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ll = ui;
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ll = ul;
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// CHECK-MESSAGES: :[[@LINE-1]]:8: warning: narrowing conversion from 'unsigned long' to signed type 'long long' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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ll = ull;
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// CHECK-MESSAGES: :[[@LINE-1]]:8: warning: narrowing conversion from 'unsigned long long' to signed type 'long long' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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}
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void narrow_constant_to_unsigned_integer_is_ok() {
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unsigned char uc1 = 0;
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unsigned char uc2 = 255;
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unsigned char uc3 = -1; // unsigned dst type is well defined.
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unsigned char uc4 = 256; // unsigned dst type is well defined.
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unsigned short us1 = 0;
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unsigned short us2 = 65535;
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unsigned short us3 = -1; // unsigned dst type is well defined.
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unsigned short us4 = 65536; // unsigned dst type is well defined.
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}
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void narrow_constant_to_signed_integer_is_not_ok() {
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char c1 = -128;
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char c2 = 127;
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char c3 = -129;
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// CHECK-MESSAGES: :[[@LINE-1]]:13: warning: narrowing conversion from constant value -129 (0xFFFFFF7F) of type 'int' to signed type 'char' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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char c4 = 128;
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// CHECK-MESSAGES: :[[@LINE-1]]:13: warning: narrowing conversion from constant value 128 (0x00000080) of type 'int' to signed type 'char' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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short s1 = -32768;
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short s2 = 32767;
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short s3 = -32769;
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// CHECK-MESSAGES: :[[@LINE-1]]:14: warning: narrowing conversion from constant value -32769 (0xFFFF7FFF) of type 'int' to signed type 'short' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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short s4 = 32768;
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// CHECK-MESSAGES: :[[@LINE-1]]:14: warning: narrowing conversion from constant value 32768 (0x00008000) of type 'int' to signed type 'short' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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}
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void narrow_conditional_operator_contant_to_unsigned_is_ok(bool b) {
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// conversion to unsigned dst type is well defined.
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unsigned char c1 = b ? 1 : 0;
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unsigned char c2 = b ? 1 : 256;
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unsigned char c3 = b ? -1 : 0;
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}
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void narrow_conditional_operator_contant_to_signed_is_not_ok(bool b) {
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char uc1 = b ? 1 : 0;
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char uc2 = b ? 1 : 128;
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// CHECK-MESSAGES: :[[@LINE-1]]:22: warning: narrowing conversion from constant value 128 (0x00000080) of type 'int' to signed type 'char' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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char uc3 = b ? -129 : 0;
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// CHECK-MESSAGES: :[[@LINE-1]]:18: warning: narrowing conversion from constant value -129 (0xFFFFFF7F) of type 'int' to signed type 'char' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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unsigned long long ysize;
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long long mirror = b ? -1 : ysize - 1;
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// CHECK-MESSAGES: :[[@LINE-1]]:26: warning: narrowing conversion from constant value 18446744073709551615 (0xFFFFFFFFFFFFFFFF) of type 'unsigned long long' to signed type 'long long' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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// CHECK-MESSAGES: :[[@LINE-2]]:37: warning: narrowing conversion from 'unsigned long long' to signed type 'long long' is implementation-defined [cppcoreguidelines-narrowing-conversions]
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}
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void narrow_constant_to_floating_point() {
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float f_ok = 1ULL << 24; // fits in 24 bits mantissa.
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float f_not_ok = (1ULL << 24) + 1ULL; // doesn't fit in 24 bits mantissa.
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// CHECK-MESSAGES: :[[@LINE-1]]:20: warning: narrowing conversion from constant value 16777217 of type 'unsigned long long' to 'float' [cppcoreguidelines-narrowing-conversions]
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double d_ok = 1ULL << 53; // fits in 53 bits mantissa.
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double d_not_ok = (1ULL << 53) + 1ULL; // doesn't fit in 53 bits mantissa.
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// CHECK-MESSAGES: :[[@LINE-1]]:21: warning: narrowing conversion from constant value 9007199254740993 of type 'unsigned long long' to 'double' [cppcoreguidelines-narrowing-conversions]
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}
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void casting_integer_to_bool_is_ok() {
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int i;
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while (i) {
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}
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for (; i;) {
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}
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if (i) {
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}
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}
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void casting_float_to_bool_is_not_ok() {
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float f;
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while (f) {
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// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: narrowing conversion from 'float' to 'bool' [cppcoreguidelines-narrowing-conversions]
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}
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for (; f;) {
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// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: narrowing conversion from 'float' to 'bool' [cppcoreguidelines-narrowing-conversions]
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}
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if (f) {
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// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from 'float' to 'bool' [cppcoreguidelines-narrowing-conversions]
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}
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}
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void legitimate_comparison_do_not_warn(unsigned long long size) {
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for (int i = 0; i < size; ++i) {
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}
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}
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void ok(double d) {
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int i = 0;
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i = 1;
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i = static_cast<int>(0.5);
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i = static_cast<int>(d);
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i = std::ceil(0.5);
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i = ::std::floor(0.5);
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{
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using std::ceil;
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i = ceil(0.5f);
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}
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i = ceil(0.5f);
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}
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void ok_binary_ops(double d) {
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int i = 0;
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i += 1;
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i += static_cast<int>(0.5);
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i += static_cast<int>(d);
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i += (int)d;
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i += std::ceil(0.5);
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i += ::std::floor(0.5);
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{
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using std::ceil;
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i += ceil(0.5f);
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}
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i += ceil(0.5f);
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}
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// We're bailing out in templates and macros.
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template <typename T1, typename T2>
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void f(T1 one, T2 two) {
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one += two;
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}
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void template_context() {
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f(1, 2);
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f(1, .5f);
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f(1, .5);
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f(1, .5l);
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}
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#define DERP(i, j) (i += j)
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void macro_context() {
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int i = 0;
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DERP(i, 2);
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DERP(i, .5f);
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DERP(i, .5);
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DERP(i, .5l);
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}
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} // namespace floats
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