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According to MSVC manual (*1), cl.exe can skip including a header file when that: - contains #pragma once, or - starts with #ifndef, or - starts with #if ! defined. GCC has a similar trick (*2), but it acts more stricter (e. g. there must be _no tokens_ outside of #ifndef...#endif). Sun C lacked #pragma once for a looong time. Oracle Developer Studio 12.5 finally implemented it, but we cannot assume such recent version. This changeset modifies header files so that each of them include strictly one #ifndef...#endif. I believe this is the most portable way to trigger compiler optimizations. [Bug #16770] *1: https://docs.microsoft.com/en-us/cpp/preprocessor/once *2: https://gcc.gnu.org/onlinedocs/cppinternals/Guard-Macros.html
50 lines
1.8 KiB
C
50 lines
1.8 KiB
C
#ifndef INTERNAL_COMPAR_H /*-*-C-*-vi:se ft=c:*/
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#define INTERNAL_COMPAR_H
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/**
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* @file
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* @author Ruby developers <ruby-core@ruby-lang.org>
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* @copyright This file is a part of the programming language Ruby.
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* Permission is hereby granted, to either redistribute and/or
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* modify this file, provided that the conditions mentioned in the
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* file COPYING are met. Consult the file for details.
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* @brief Internal header for Comparable.
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*/
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#include "internal/vm.h" /* for rb_method_basic_definition_p */
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#define STRING_P(s) (RB_TYPE_P((s), T_STRING) && CLASS_OF(s) == rb_cString)
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enum {
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cmp_opt_Integer,
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cmp_opt_String,
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cmp_opt_Float,
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cmp_optimizable_count
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};
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struct cmp_opt_data {
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unsigned int opt_methods;
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unsigned int opt_inited;
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};
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#define NEW_CMP_OPT_MEMO(type, value) \
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NEW_PARTIAL_MEMO_FOR(type, value, cmp_opt)
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#define CMP_OPTIMIZABLE_BIT(type) (1U << TOKEN_PASTE(cmp_opt_,type))
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#define CMP_OPTIMIZABLE(data, type) \
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(((data).opt_inited & CMP_OPTIMIZABLE_BIT(type)) ? \
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((data).opt_methods & CMP_OPTIMIZABLE_BIT(type)) : \
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(((data).opt_inited |= CMP_OPTIMIZABLE_BIT(type)), \
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rb_method_basic_definition_p(TOKEN_PASTE(rb_c,type), id_cmp) && \
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((data).opt_methods |= CMP_OPTIMIZABLE_BIT(type))))
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#define OPTIMIZED_CMP(a, b, data) \
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((FIXNUM_P(a) && FIXNUM_P(b) && CMP_OPTIMIZABLE(data, Integer)) ? \
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(((long)a > (long)b) ? 1 : ((long)a < (long)b) ? -1 : 0) : \
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(STRING_P(a) && STRING_P(b) && CMP_OPTIMIZABLE(data, String)) ? \
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rb_str_cmp(a, b) : \
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(RB_FLOAT_TYPE_P(a) && RB_FLOAT_TYPE_P(b) && CMP_OPTIMIZABLE(data, Float)) ? \
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rb_float_cmp(a, b) : \
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rb_cmpint(rb_funcallv(a, id_cmp, 1, &b), a, b))
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/* compar.c */
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VALUE rb_invcmp(VALUE, VALUE);
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#endif /* INTERNAL_COMPAR_H */
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