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Fix ABI compatibility (#1961)

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This commit is contained in:
Victor Zverovich 2020-10-29 08:02:40 -07:00
parent 69a84198b0
commit 425778aa67
3 changed files with 44 additions and 6 deletions
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12
include/fmt/format-inl.h
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@ -261,11 +261,19 @@ const uint64_t basic_data<T>::powers_of_10_64[] = {
10000000000000000000ULL};
template <typename T>
const uint32_t basic_data<T>::zero_or_powers_of_10_32[] = {0, 0,
const uint32_t basic_data<T>::zero_or_powers_of_10_32[] = {0,
FMT_POWERS_OF_10(1)};
template <typename T>
const uint64_t basic_data<T>::zero_or_powers_of_10_64[] = {
0, FMT_POWERS_OF_10(1), FMT_POWERS_OF_10(1000000000ULL),
10000000000000000000ULL};
template <typename T>
const uint32_t basic_data<T>::zero_or_powers_of_10_32_new[] = {
0, 0, FMT_POWERS_OF_10(1)};
template <typename T>
const uint64_t basic_data<T>::zero_or_powers_of_10_64_new[] = {
0, 0, FMT_POWERS_OF_10(1), FMT_POWERS_OF_10(1000000000ULL),
10000000000000000000ULL};

13
include/fmt/format.h
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@ -866,8 +866,8 @@ template <typename T> struct FMT_EXTERN_TEMPLATE_API divtest_table_entry {
// Static data is placed in this class template for the header-only config.
template <typename T = void> struct FMT_EXTERN_TEMPLATE_API basic_data {
static const uint64_t powers_of_10_64[];
static const uint32_t zero_or_powers_of_10_32[];
static const uint64_t zero_or_powers_of_10_64[];
static const uint32_t zero_or_powers_of_10_32_new[];
static const uint64_t zero_or_powers_of_10_64_new[];
static const uint64_t grisu_pow10_significands[];
static const int16_t grisu_pow10_exponents[];
static const divtest_table_entry<uint32_t> divtest_table_for_pow5_32[];
@ -891,6 +891,10 @@ template <typename T = void> struct FMT_EXTERN_TEMPLATE_API basic_data {
static const char signs[];
static const char left_padding_shifts[5];
static const char right_padding_shifts[5];
// DEPRECATED! These are for ABI compatibility.
static const uint32_t zero_or_powers_of_10_32[];
static const uint64_t zero_or_powers_of_10_64[];
};
// Maps bsr(n) to ceil(log10(pow(2, bsr(n) + 1) - 1)).
@ -917,7 +921,7 @@ struct data : basic_data<> {};
inline int count_digits(uint64_t n) {
// https://github.com/fmtlib/format-benchmark/blob/master/digits10
auto t = bsr2log10(FMT_BUILTIN_CLZLL(n | 1) ^ 63);
return t - (n < data::zero_or_powers_of_10_64[t]);
return t - (n < data::zero_or_powers_of_10_64_new[t]);
}
#else
// Fallback version of count_digits used when __builtin_clz is not available.
@ -984,7 +988,7 @@ template <> int count_digits<4>(detail::fallback_uintptr n);
// Optional version of count_digits for better performance on 32-bit platforms.
inline int count_digits(uint32_t n) {
auto t = bsr2log10(FMT_BUILTIN_CLZ(n | 1) ^ 31);
return t - (n < data::zero_or_powers_of_10_32[t]);
return t - (n < data::zero_or_powers_of_10_32_new[t]);
}
#endif
@ -3785,6 +3789,7 @@ extern template void detail::vformat_to(detail::buffer<char>&, string_view,
basic_format_args<format_context>,
detail::locale_ref);
namespace detail {
extern template FMT_API std::string grouping_impl<char>(locale_ref loc);
extern template FMT_API std::string grouping_impl<wchar_t>(locale_ref loc);
extern template FMT_API char thousands_sep_impl<char>(locale_ref loc);

25
src/format.cc
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@ -28,6 +28,31 @@ template dragonbox::decimal_fp<float> dragonbox::to_decimal(float x)
FMT_NOEXCEPT;
template dragonbox::decimal_fp<double> dragonbox::to_decimal(double x)
FMT_NOEXCEPT;
// DEPRECATED! This function exists for ABI compatibility.
template <typename Char>
typename basic_format_context<std::back_insert_iterator<buffer<Char>>,
Char>::iterator
vformat_to(buffer<Char>& buf, basic_string_view<Char> format_str,
basic_format_args<basic_format_context<
std::back_insert_iterator<buffer<type_identity_t<Char>>>,
type_identity_t<Char>>>
args) {
using iterator = std::back_insert_iterator<buffer<char>>;
using context = basic_format_context<
std::back_insert_iterator<buffer<type_identity_t<Char>>>,
type_identity_t<Char>>;
auto out = iterator(buf);
format_handler<iterator, Char, context> h(out, format_str, args, {});
parse_format_string<false>(format_str, h);
return out;
}
template basic_format_context<std::back_insert_iterator<buffer<char>>,
char>::iterator
vformat_to(buffer<char>&, string_view,
basic_format_args<basic_format_context<
std::back_insert_iterator<buffer<type_identity_t<char>>>,
type_identity_t<char>>>);
} // namespace detail
template struct FMT_INSTANTIATION_DEF_API detail::basic_data<void>;