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ruby--ruby/constant.h
卜部昌平 4ff3f20540 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 ]

*1: https://docs.microsoft.com/en-us/cpp/preprocessor/once
*2: https://gcc.gnu.org/onlinedocs/cppinternals/Guard-Macros.html
2020-04-13 16:06:00 +09:00

55 lines
1.6 KiB
C

#ifndef CONSTANT_H
#define CONSTANT_H
/**********************************************************************
constant.h -
$Author$
created at: Sun Nov 15 00:09:33 2009
Copyright (C) 2009 Yusuke Endoh
**********************************************************************/
#include "ruby/ruby.h"
#include "id_table.h"
typedef enum {
CONST_DEPRECATED = 0x100,
CONST_VISIBILITY_MASK = 0xff,
CONST_PUBLIC = 0x00,
CONST_PRIVATE,
CONST_VISIBILITY_MAX
} rb_const_flag_t;
#define RB_CONST_PRIVATE_P(ce) \
(((ce)->flag & CONST_VISIBILITY_MASK) == CONST_PRIVATE)
#define RB_CONST_PUBLIC_P(ce) \
(((ce)->flag & CONST_VISIBILITY_MASK) == CONST_PUBLIC)
#define RB_CONST_DEPRECATED_P(ce) \
((ce)->flag & CONST_DEPRECATED)
typedef struct rb_const_entry_struct {
rb_const_flag_t flag;
int line;
VALUE value; /* should be mark */
VALUE file; /* should be mark */
} rb_const_entry_t;
VALUE rb_mod_private_constant(int argc, const VALUE *argv, VALUE obj);
VALUE rb_mod_public_constant(int argc, const VALUE *argv, VALUE obj);
VALUE rb_mod_deprecate_constant(int argc, const VALUE *argv, VALUE obj);
void rb_free_const_table(struct rb_id_table *tbl);
VALUE rb_const_source_location(VALUE, ID);
MJIT_SYMBOL_EXPORT_BEGIN
int rb_autoloading_value(VALUE mod, ID id, VALUE *value, rb_const_flag_t *flag);
rb_const_entry_t *rb_const_lookup(VALUE klass, ID id);
VALUE rb_public_const_get_at(VALUE klass, ID id);
VALUE rb_public_const_get_from(VALUE klass, ID id);
int rb_public_const_defined_from(VALUE klass, ID id);
VALUE rb_const_source_location_at(VALUE, ID);
MJIT_SYMBOL_EXPORT_END
#endif /* CONSTANT_H */