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#ifndef RBIMPL_ARITHMERIC_ST_DATA_T_H /*-*-C++-*-vi:se ft=cpp:*/ #define RBIMPL_ARITHMERIC_ST_DATA_T_H /** * @file * @author Ruby developers <ruby-core@ruby-lang.org> * @copyright This file is a part of the programming language Ruby. * Permission is hereby granted, to either redistribute and/or * modify this file, provided that the conditions mentioned in the * file COPYING are met. Consult the file for details. * @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are * implementation details. Don't take them as canon. They could * rapidly appear then vanish. The name (path) of this header file * is also an implementation detail. Do not expect it to persist * at the place it is now. Developers are free to move it anywhere * anytime at will. * @note To ruby-core: remember that this header can be possibly * recursively included from extension libraries written in C++. * Do not expect for instance `__VA_ARGS__` is always available. * We assume C99 for ruby itself but we don't assume languages of * extension libraries. They could be written in C++98. * @brief Arithmetic conversion between C's `st_data_t` and Ruby's. */ #include "ruby/internal/arithmetic/fixnum.h" #include "ruby/internal/arithmetic/long.h" #include "ruby/internal/attr/artificial.h" #include "ruby/internal/attr/const.h" #include "ruby/internal/attr/constexpr.h" #include "ruby/internal/cast.h" #include "ruby/internal/value.h" #include "ruby/assert.h" #include "ruby/st.h" #define ST2FIX RB_ST2FIX /**< @old{RB_ST2FIX} */ /** @cond INTERNAL_MACRO */ #define RB_ST2FIX RB_ST2FIX /** @endcond */ RBIMPL_ATTR_CONST_UNLESS_DEBUG() RBIMPL_ATTR_CONSTEXPR_UNLESS_DEBUG(CXX14) RBIMPL_ATTR_ARTIFICIAL() /** * Converts a C's `st_data_t` into an instance of ::rb_cInteger. * * @param[in] i The data in question. * @return A converted result * @warning THIS CONVERSION LOSES DATA! Be warned. * @see https://bugs.ruby-lang.org/issues/13877 * @see https://bugs.ruby-lang.org/issues/14218 * * @internal * * This is needed because of hash functions. Hash functions return * `st_data_t`, which could theoretically be bigger than Fixnums. However * allocating Bignums for them every time we calculate hash values is just too * heavy. To avoid penalty we need to ignore some upper bit(s) and stick to * Fixnums. This function is used for that purpose. */ static inline VALUE RB_ST2FIX(st_data_t i) { SIGNED_VALUE x = i; if (x >= 0) { x &= RUBY_FIXNUM_MAX; } else { x |= RUBY_FIXNUM_MIN; } RBIMPL_ASSERT_OR_ASSUME(RB_FIXABLE(x)); unsigned long y = RBIMPL_CAST((unsigned long)x); return RB_LONG2FIX(y); } #endif /* RBIMPL_ARITHMETIC_ST_DATA_T_H */
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