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Fix conversion warnings (#989)

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* Fix sign conversion warnings

* Ignore unused local typedefs

* Remove cast reported as useless on GCC

* Remove warning on unused variable

* Enable conversion warning checking for pedantic build

* Fix sign-conversion warnings in headers
This commit is contained in:
Sign Bit 2018-12-20 09:24:19 -05:00 committed by Victor Zverovich
parent 77a7244804
commit 0bbdca5b8b
9 changed files with 71 additions and 69 deletions
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9
CMakeLists.txt
View File

@ -74,10 +74,11 @@ if (CMAKE_CXX_COMPILER_ID MATCHES "GNU")
-Wcast-align -Wnon-virtual-dtor
-Wctor-dtor-privacy -Wdisabled-optimization
-Winvalid-pch -Woverloaded-virtual
-Wno-ctor-dtor-privacy -Wno-dangling-else
-Wno-format-nonliteral -Wno-sign-conversion -Wno-shadow)
-Wconversion
-Wno-ctor-dtor-privacy -Wno-format-nonliteral -Wno-shadow)
if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.6)
set(PEDANTIC_COMPILE_FLAGS ${PEDANTIC_COMPILE_FLAGS} -Wnoexcept)
set(PEDANTIC_COMPILE_FLAGS ${PEDANTIC_COMPILE_FLAGS} -Wnoexcept
-Wno-dangling-else -Wno-unused-local-typedefs)
endif ()
if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0)
set(PEDANTIC_COMPILE_FLAGS ${PEDANTIC_COMPILE_FLAGS} -Wdouble-promotion
@ -92,7 +93,7 @@ if (CMAKE_CXX_COMPILER_ID MATCHES "GNU")
endif ()
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
set(PEDANTIC_COMPILE_FLAGS -Wall -Wextra -pedantic)
set(PEDANTIC_COMPILE_FLAGS -Wall -Wextra -pedantic -Wconversion -Wno-sign-conversion)
check_cxx_compiler_flag(-Wzero-as-null-pointer-constant HAS_NULLPTR_WARNING)
if (HAS_NULLPTR_WARNING)
set(PEDANTIC_COMPILE_FLAGS ${PEDANTIC_COMPILE_FLAGS}

4
include/fmt/chrono.h
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@ -250,7 +250,7 @@ struct chrono_formatter {
void write(int value, int width) {
typedef typename int_traits<int>::main_type main_type;
main_type n = to_unsigned(value);
int num_digits = static_cast<int>(internal::count_digits(n));
int num_digits = internal::count_digits(n);
if (width > num_digits)
out = std::fill_n(out, width - num_digits, '0');
out = format_decimal<char_type>(out, n, num_digits);
@ -415,7 +415,7 @@ struct formatter<std::chrono::duration<Rep, Period>, Char> {
if (begin == end) return begin;
begin = internal::parse_width(begin, end, handler);
end = parse_chrono_format(begin, end, internal::chrono_format_checker());
format_str = basic_string_view<Char>(&*begin, end - begin);
format_str = basic_string_view<Char>(&*begin, internal::to_unsigned(end - begin));
return end;
}

17
include/fmt/color.h
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@ -246,7 +246,8 @@ struct color_type {
}
FMT_CONSTEXPR color_type(rgb rgb_color) FMT_NOEXCEPT
: is_rgb(true), value{} {
value.rgb_color = (rgb_color.r << 16) + (rgb_color.g << 8) + rgb_color.b;
value.rgb_color = (static_cast<uint32_t>(rgb_color.r) << 16)
| (static_cast<uint32_t>(rgb_color.g) << 8) | rgb_color.b;
}
FMT_CONSTEXPR color_type(terminal_color term_color) FMT_NOEXCEPT
: is_rgb(), value{} {
@ -395,22 +396,22 @@ struct ansi_color_escape {
// sequence.
if (!text_color.is_rgb) {
bool is_background = esc == internal::data::BACKGROUND_COLOR;
uint8_t value = text_color.value.term_color;
uint32_t value = text_color.value.term_color;
// Background ASCII codes are the same as the foreground ones but with
// 10 more.
if (is_background)
value += 10;
value += 10u;
std::size_t index = 0;
buffer[index++] = static_cast<Char>('\x1b');
buffer[index++] = static_cast<Char>('[');
if (value >= 100) {
if (value >= 100u) {
buffer[index++] = static_cast<Char>('1');
value %= 100;
value %= 100u;
}
buffer[index++] = static_cast<Char>('0' + value / 10);
buffer[index++] = static_cast<Char>('0' + value % 10);
buffer[index++] = static_cast<Char>('0' + value / 10u);
buffer[index++] = static_cast<Char>('0' + value % 10u);
buffer[index++] = static_cast<Char>('m');
buffer[index++] = static_cast<Char>('\0');
@ -452,7 +453,7 @@ struct ansi_color_escape {
FMT_CONSTEXPR operator const Char *() const FMT_NOEXCEPT { return buffer; }
private:
Char buffer[7 + 3 * 4 + 1];
Char buffer[7u + 3u * 4u + 1u];
static FMT_CONSTEXPR void to_esc(uint8_t c, Char *out,
char delimiter) FMT_NOEXCEPT {

20
include/fmt/format-inl.h
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@ -172,7 +172,7 @@ void format_error_code(internal::buffer &out, int error_code,
abs_value = 0 - abs_value;
++error_code_size;
}
error_code_size += internal::count_digits(abs_value);
error_code_size += internal::to_unsigned(internal::count_digits(abs_value));
writer w(out);
if (message.size() <= inline_buffer_size - error_code_size) {
w.write(message);
@ -464,14 +464,14 @@ FMT_FUNC fp get_cached_power(int min_exponent, int &pow10_exponent) {
}
FMT_FUNC bool grisu2_round(
char *buf, ptrdiff_t &size, size_t max_digits, uint64_t delta,
char *buf, int &size, int max_digits, uint64_t delta,
uint64_t remainder, uint64_t exp, uint64_t diff, int &exp10) {
while (remainder < diff && delta - remainder >= exp &&
(remainder + exp < diff || diff - remainder > remainder + exp - diff)) {
--buf[size - 1];
remainder += exp;
}
if (size > static_cast<ptrdiff_t>(max_digits)) {
if (size > max_digits) {
--size;
++exp10;
if (buf[size] >= '5')
@ -482,8 +482,8 @@ FMT_FUNC bool grisu2_round(
// Generates output using Grisu2 digit-gen algorithm.
FMT_FUNC bool grisu2_gen_digits(
char *buf, ptrdiff_t &size, uint32_t hi, uint64_t lo, int &exp,
uint64_t delta, const fp &one, const fp &diff, size_t max_digits) {
char *buf, int &size, uint32_t hi, uint64_t lo, int &exp,
uint64_t delta, const fp &one, const fp &diff, int max_digits) {
// Generate digits for the most significant part (hi).
while (exp > 0) {
uint32_t digit = 0;
@ -507,7 +507,7 @@ FMT_FUNC bool grisu2_gen_digits(
buf[size++] = static_cast<char>('0' + digit);
--exp;
uint64_t remainder = (static_cast<uint64_t>(hi) << -one.e) + lo;
if (remainder <= delta || size > static_cast<ptrdiff_t>(max_digits)) {
if (remainder <= delta || size > max_digits) {
return grisu2_round(
buf, size, max_digits, delta, remainder,
static_cast<uint64_t>(data::POWERS_OF_10_32[exp]) << -one.e,
@ -523,7 +523,7 @@ FMT_FUNC bool grisu2_gen_digits(
buf[size++] = static_cast<char>('0' + digit);
lo &= one.f - 1;
--exp;
if (lo < delta || size > static_cast<ptrdiff_t>(max_digits)) {
if (lo < delta || size > max_digits) {
return grisu2_round(buf, size, max_digits, delta, lo, one.f,
diff.f * data::POWERS_OF_10_32[-exp], exp);
}
@ -704,7 +704,7 @@ FMT_FUNC gen_digits_params process_specs(const core_format_specs &specs,
++num_digits;
break;
}
params.num_digits = to_unsigned(num_digits);
params.num_digits = num_digits;
char_counter counter{num_digits};
grisu2_prettify(params, params.num_digits, exp - num_digits, counter);
buf.resize(to_unsigned(counter.size));
@ -739,7 +739,7 @@ FMT_FUNC typename std::enable_if<sizeof(Double) == sizeof(uint64_t), bool>::type
// hi (p1 in Grisu) contains the most significant digits of scaled_upper.
// hi = floor(upper / one).
uint32_t hi = static_cast<uint32_t>(upper.f >> -one.e);
int exp = static_cast<int>(count_digits(hi)); // kappa in Grisu.
int exp = count_digits(hi); // kappa in Grisu.
gen_digits_params params = process_specs(specs, cached_exp + exp, buf);
fp_value.normalize();
fp scaled_value = fp_value * cached_pow;
@ -750,7 +750,7 @@ FMT_FUNC typename std::enable_if<sizeof(Double) == sizeof(uint64_t), bool>::type
// lo (p2 in Grisu) contains the least significants digits of scaled_upper.
// lo = supper % one.
uint64_t lo = upper.f & (one.f - 1);
ptrdiff_t size = 0;
int size = 0;
if (!grisu2_gen_digits(buf.data(), size, hi, lo, exp, delta, one, diff,
params.num_digits)) {
buf.clear();

83
include/fmt/format.h
View File

@ -66,10 +66,6 @@
// many valid cases.
# pragma GCC diagnostic ignored "-Wshadow"
// Disable the warning about implicit conversions that may change the sign of
// an integer; silencing it otherwise would require many explicit casts.
# pragma GCC diagnostic ignored "-Wsign-conversion"
// Disable the warning about nonliteral format strings because we construct
// them dynamically when falling back to snprintf for FP formatting.
# pragma GCC diagnostic ignored "-Wformat-nonliteral"
@ -770,16 +766,16 @@ typedef basic_data<> data;
#ifdef FMT_BUILTIN_CLZLL
// Returns the number of decimal digits in n. Leading zeros are not counted
// except for n == 0 in which case count_digits returns 1.
inline unsigned count_digits(uint64_t n) {
inline int count_digits(uint64_t n) {
// Based on http://graphics.stanford.edu/~seander/bithacks.html#IntegerLog10
// and the benchmark https://github.com/localvoid/cxx-benchmark-count-digits.
int t = (64 - FMT_BUILTIN_CLZLL(n | 1)) * 1233 >> 12;
return to_unsigned(t) - (n < data::ZERO_OR_POWERS_OF_10_64[t]) + 1;
return t - (n < data::ZERO_OR_POWERS_OF_10_64[t]) + 1;
}
#else
// Fallback version of count_digits used when __builtin_clz is not available.
inline unsigned count_digits(uint64_t n) {
unsigned count = 1;
inline int count_digits(uint64_t n) {
int count = 1;
for (;;) {
// Integer division is slow so do it for a group of four digits instead
// of for every digit. The idea comes from the talk by Alexandrescu
@ -900,9 +896,9 @@ class decimal_formatter_null : public decimal_formatter {
#ifdef FMT_BUILTIN_CLZ
// Optional version of count_digits for better performance on 32-bit platforms.
inline unsigned count_digits(uint32_t n) {
inline int count_digits(uint32_t n) {
int t = (32 - FMT_BUILTIN_CLZ(n | 1)) * 1233 >> 12;
return to_unsigned(t) - (n < data::ZERO_OR_POWERS_OF_10_32[t]) + 1;
return t - (n < data::ZERO_OR_POWERS_OF_10_32[t]) + 1;
}
#endif
@ -959,8 +955,9 @@ inline wchar_t thousands_sep(locale_ref loc) {
// thousands_sep is a functor that is called after writing each char to
// add a thousands separator if necessary.
template <typename UInt, typename Char, typename ThousandsSep>
inline Char *format_decimal(Char *buffer, UInt value, unsigned num_digits,
inline Char *format_decimal(Char *buffer, UInt value, int num_digits,
ThousandsSep thousands_sep) {
FMT_ASSERT(num_digits >= 0, "invalid digit count");
buffer += num_digits;
Char *end = buffer;
while (value >= 100) {
@ -988,7 +985,8 @@ inline Char *format_decimal(Char *buffer, UInt value, unsigned num_digits,
template <typename OutChar, typename UInt, typename Iterator,
typename ThousandsSep>
inline Iterator format_decimal(
Iterator out, UInt value, unsigned num_digits, ThousandsSep sep) {
Iterator out, UInt value, int num_digits, ThousandsSep sep) {
FMT_ASSERT(num_digits >= 0, "invalid digit count");
typedef typename ThousandsSep::char_type char_type;
// Buffer should be large enough to hold all digits (<= digits10 + 1).
enum { max_size = std::numeric_limits<UInt>::digits10 + 1 };
@ -999,25 +997,26 @@ inline Iterator format_decimal(
}
template <typename OutChar, typename It, typename UInt>
inline It format_decimal(It out, UInt value, unsigned num_digits) {
inline It format_decimal(It out, UInt value, int num_digits) {
return format_decimal<OutChar>(out, value, num_digits, no_thousands_sep());
}
template <unsigned BASE_BITS, typename Char, typename UInt>
inline Char *format_uint(Char *buffer, UInt value, unsigned num_digits,
inline Char *format_uint(Char *buffer, UInt value, int num_digits,
bool upper = false) {
buffer += num_digits;
Char *end = buffer;
do {
const char *digits = upper ? "0123456789ABCDEF" : "0123456789abcdef";
unsigned digit = (value & ((1 << BASE_BITS) - 1));
*--buffer = static_cast<Char>(BASE_BITS < 4 ? '0' + digit : digits[digit]);
*--buffer = static_cast<Char>(BASE_BITS < 4 ? static_cast<char>('0' + digit)
: digits[digit]);
} while ((value >>= BASE_BITS) != 0);
return end;
}
template <unsigned BASE_BITS, typename Char, typename It, typename UInt>
inline It format_uint(It out, UInt value, unsigned num_digits,
inline It format_uint(It out, UInt value, int num_digits,
bool upper = false) {
// Buffer should be large enough to hold all digits (digits / BASE_BITS + 1)
// and null.
@ -1979,7 +1978,7 @@ FMT_CONSTEXPR bool find(Ptr first, Ptr last, T value, Ptr &out) {
template <>
inline bool find<false, char>(
const char *first, const char *last, char value, const char *&out) {
out = static_cast<const char*>(std::memchr(first, value, last - first));
out = static_cast<const char*>(std::memchr(first, value, internal::to_unsigned(last - first)));
return out != FMT_NULL;
}
@ -2062,7 +2061,7 @@ class format_string_checker {
public:
explicit FMT_CONSTEXPR format_string_checker(
basic_string_view<Char> format_str, ErrorHandler eh)
: arg_id_(-1), context_(format_str, eh),
: arg_id_((std::numeric_limits<unsigned>::max)()), context_(format_str, eh),
parse_funcs_{&parse_format_specs<Args, parse_context_type>...} {}
FMT_CONSTEXPR void on_text(const Char *, const Char *) {}
@ -2082,7 +2081,7 @@ class format_string_checker {
FMT_CONSTEXPR const Char *on_format_specs(const Char *begin, const Char *) {
context_.advance_to(begin);
return to_unsigned(arg_id_) < NUM_ARGS ?
return arg_id_ < NUM_ARGS ?
parse_funcs_[arg_id_](context_) : begin;
}
@ -2095,14 +2094,14 @@ class format_string_checker {
enum { NUM_ARGS = sizeof...(Args) };
FMT_CONSTEXPR void check_arg_id() {
if (internal::to_unsigned(arg_id_) >= NUM_ARGS)
if (arg_id_ >= NUM_ARGS)
context_.on_error("argument index out of range");
}
// Format specifier parsing function.
typedef const Char *(*parse_func)(parse_context_type &);
int arg_id_;
unsigned arg_id_;
parse_context_type context_;
parse_func parse_funcs_[NUM_ARGS > 0 ? NUM_ARGS : 1];
};
@ -2324,9 +2323,9 @@ class basic_writer {
// <left-padding><prefix><numeric-padding><digits><right-padding>
// where <digits> are written by f(it).
template <typename Spec, typename F>
void write_int(unsigned num_digits, string_view prefix,
void write_int(int num_digits, string_view prefix,
const Spec &spec, F f) {
std::size_t size = prefix.size() + num_digits;
std::size_t size = prefix.size() + internal::to_unsigned(num_digits);
char_type fill = static_cast<char_type>(spec.fill());
std::size_t padding = 0;
if (spec.align() == ALIGN_NUMERIC) {
@ -2334,9 +2333,9 @@ class basic_writer {
padding = spec.width() - size;
size = spec.width();
}
} else if (spec.precision > static_cast<int>(num_digits)) {
} else if (spec.precision > num_digits) {
size = prefix.size() + internal::to_unsigned(spec.precision);
padding = internal::to_unsigned(spec.precision) - num_digits;
padding = internal::to_unsigned(spec.precision - num_digits);
fill = static_cast<char_type>('0');
}
align_spec as = spec;
@ -2353,8 +2352,8 @@ class basic_writer {
bool is_negative = internal::is_negative(value);
if (is_negative)
abs_value = 0 - abs_value;
unsigned num_digits = internal::count_digits(abs_value);
auto &&it = reserve((is_negative ? 1 : 0) + num_digits);
int num_digits = internal::count_digits(abs_value);
auto &&it = reserve((is_negative ? 1 : 0) + static_cast<size_t>(num_digits));
if (is_negative)
*it++ = static_cast<char_type>('-');
it = internal::format_decimal<char_type>(it, abs_value, num_digits);
@ -2375,9 +2374,9 @@ class basic_writer {
// Counts the number of digits in abs_value. BITS = log2(radix).
template <unsigned BITS>
unsigned count_digits() const {
int count_digits() const {
unsigned_type n = abs_value;
unsigned num_digits = 0;
int num_digits = 0;
do {
++num_digits;
} while ((n >>= BITS) != 0);
@ -2399,7 +2398,7 @@ class basic_writer {
struct dec_writer {
unsigned_type abs_value;
unsigned num_digits;
int num_digits;
template <typename It>
void operator()(It &&it) const {
@ -2408,14 +2407,14 @@ class basic_writer {
};
void on_dec() {
unsigned num_digits = internal::count_digits(abs_value);
int num_digits = internal::count_digits(abs_value);
writer.write_int(num_digits, get_prefix(), spec,
dec_writer{abs_value, num_digits});
}
struct hex_writer {
int_writer &self;
unsigned num_digits;
int num_digits;
template <typename It>
void operator()(It &&it) const {
@ -2429,7 +2428,7 @@ class basic_writer {
prefix[prefix_size++] = '0';
prefix[prefix_size++] = static_cast<char>(spec.type);
}
unsigned num_digits = count_digits<4>();
int num_digits = count_digits<4>();
writer.write_int(num_digits, get_prefix(), spec,
hex_writer{*this, num_digits});
}
@ -2437,7 +2436,7 @@ class basic_writer {
template <int BITS>
struct bin_writer {
unsigned_type abs_value;
unsigned num_digits;
int num_digits;
template <typename It>
void operator()(It &&it) const {
@ -2450,15 +2449,15 @@ class basic_writer {
prefix[prefix_size++] = '0';
prefix[prefix_size++] = static_cast<char>(spec.type);
}
unsigned num_digits = count_digits<1>();
int num_digits = count_digits<1>();
writer.write_int(num_digits, get_prefix(), spec,
bin_writer<1>{abs_value, num_digits});
}
void on_oct() {
unsigned num_digits = count_digits<3>();
int num_digits = count_digits<3>();
if (spec.has(HASH_FLAG) &&
spec.precision <= static_cast<int>(num_digits)) {
spec.precision <= num_digits) {
// Octal prefix '0' is counted as a digit, so only add it if precision
// is not greater than the number of digits.
prefix[prefix_size++] = '0';
@ -2471,7 +2470,7 @@ class basic_writer {
struct num_writer {
unsigned_type abs_value;
unsigned size;
int size;
char_type sep;
template <typename It>
@ -2483,9 +2482,9 @@ class basic_writer {
};
void on_num() {
unsigned num_digits = internal::count_digits(abs_value);
int num_digits = internal::count_digits(abs_value);
char_type sep = internal::thousands_sep<char_type>(writer.locale_);
unsigned size = num_digits + SEP_SIZE * ((num_digits - 1) / 3);
int size = num_digits + SEP_SIZE * ((num_digits - 1) / 3);
writer.write_int(size, get_prefix(), spec,
num_writer{abs_value, size, sep});
}
@ -2909,9 +2908,9 @@ inline void format_decimal(char *&buffer, T value) {
*buffer++ = internal::data::DIGITS[index + 1];
return;
}
unsigned num_digits = internal::count_digits(abs_value);
int num_digits = internal::count_digits(abs_value);
internal::format_decimal<char>(
internal::make_checked(buffer, num_digits), abs_value, num_digits);
internal::make_checked(buffer, internal::to_unsigned(num_digits)), abs_value, num_digits);
buffer += num_digits;
}

2
include/fmt/printf.h
View File

@ -631,7 +631,7 @@ void basic_printf_context<OutputIt, Char, AF>::format() {
format_arg arg = get_arg(it, arg_index);
if (spec.has(HASH_FLAG) && visit_format_arg(internal::is_zero_int(), arg))
spec.flags &= ~internal::to_unsigned<int>(HASH_FLAG);
spec.flags = static_cast<uint_least8_t>(spec.flags & (~internal::to_unsigned<int>(HASH_FLAG)));
if (spec.fill_ == '0') {
if (arg.is_arithmetic())
spec.align_ = ALIGN_NUMERIC;

2
include/fmt/time.h
View File

@ -122,7 +122,7 @@ struct formatter<std::tm, Char> {
auto end = it;
while (end != ctx.end() && *end != '}')
++end;
tm_format.reserve(end - it + 1);
tm_format.reserve(internal::to_unsigned(end - it + 1));
tm_format.append(it, end);
tm_format.push_back('\0');
return end;

2
test/core-test.cc
View File

@ -492,7 +492,7 @@ class QString {
inline fmt::basic_string_view<wchar_t> to_string_view(
const QString &s) FMT_NOEXCEPT {
return {reinterpret_cast<const wchar_t *>(s.utf16()),
return {s.utf16(),
static_cast<std::size_t>(s.size())};
}
}

1
test/format-test.cc
View File

@ -1917,6 +1917,7 @@ TEST(FormatTest, Enum) {
TEST(FormatTest, EnumFormatterUnambiguous) {
fmt::formatter<TestEnum> f;
ASSERT_GE(sizeof(f), 0); // use f to avoid compiler warning
}
#if FMT_HAS_FEATURE(cxx_strong_enums)