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ruby--ruby/variable.h

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add #include guard hack 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
2020-04-10 01:11:40 -04:00
#ifndef RUBY_TOPLEVEL_VARIABLE_H /*-*-C-*-vi:se ft=c:*/
#define RUBY_TOPLEVEL_VARIABLE_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.
*/
fastpath for ivar read of FL_EXIVAR objects. vm_getivar() provides fastpath for T_OBJECT by caching an index of ivar. This patch also provides fastpath for FL_EXIVAR objects. FL_EXIVAR objects have an each ivar array and index can be cached as T_OBJECT. To access this ivar array, generic_iv_tbl is exposed by rb_ivar_generic_ivtbl() (declared in variable.h which is newly introduced). Benchmark script: Benchmark.driver(repeat_count: 3){|x| x.executable name: 'clean', command: %w'../clean/miniruby' x.executable name: 'trunk', command: %w'./miniruby' objs = [Object.new, 'str', {a: 1, b: 2}, [1, 2]] objs.each.with_index{|obj, i| rep = obj.inspect rep = 'Object.new' if /\#/ =~ rep x.prelude str = %Q{ v#{i} = #{rep} def v#{i}.foo @iv # ivar access method (attr_reader) end v#{i}.instance_variable_set(:@iv, :iv) } puts str x.report %Q{ v#{i}.foo } } } Result: v0.foo # T_OBJECT clean: 85387141.8 i/s trunk: 85249373.6 i/s - 1.00x slower v1.foo # T_STRING trunk: 57894407.5 i/s clean: 39957178.6 i/s - 1.45x slower v2.foo # T_HASH trunk: 56629413.2 i/s clean: 39227088.9 i/s - 1.44x slower v3.foo # T_ARRAY trunk: 55797530.2 i/s clean: 38263572.9 i/s - 1.46x slower
2019-11-28 13:02:44 -05:00
/* per-object */
struct gen_ivtbl {
uint32_t numiv;
VALUE ivptr[FLEX_ARY_LEN];
};
sync generic_ivtbl generic_ivtbl is a process global table to maintain instance variables for non T_OBJECT/T_CLASS/... objects. So we need to protect them for multi-Ractor exection. Hint: we can make them Ractor local for unshareable objects, but now it is premature optimization.
2020-10-13 21:43:13 -04:00
int rb_ivar_generic_ivtbl_lookup(VALUE obj, struct gen_ivtbl **);
add #include guard hack 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
2020-04-10 01:11:40 -04:00
#endif /* RUBY_TOPLEVEL_VARIABLE_H */
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