robject.h

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#ifndef RBIMPL_ROBJECT_H                             /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_ROBJECT_H
#include "ruby/internal/config.h"
 
#ifdef HAVE_STDINT_H
# include <stdint.h>
#endif
 
#include "ruby/internal/attr/artificial.h"
#include "ruby/internal/attr/deprecated.h"
#include "ruby/internal/attr/pure.h"
#include "ruby/internal/cast.h"
#include "ruby/internal/fl_type.h"
#include "ruby/internal/value.h"
#include "ruby/internal/value_type.h"
 
#define ROBJECT(obj)          RBIMPL_CAST((struct RObject *)(obj))
#define ROBJECT_EMBED_LEN_MAX ROBJECT_EMBED_LEN_MAX
#define ROBJECT_EMBED         ROBJECT_EMBED
#define ROBJECT_IV_CAPACITY   ROBJECT_IV_CAPACITY
#define ROBJECT_IVPTR         ROBJECT_IVPTR
enum ruby_robject_flags {
    ROBJECT_EMBED = RUBY_FL_USER1
};
 
struct st_table;
 
struct RObject {
 
    struct RBasic basic;
 
    union {
 
        struct {
            VALUE *ivptr;
 
            struct rb_id_table *iv_index_tbl;
        } heap;
 
        /* Embedded instance variables. When an object is small enough, it
         * uses this area to store the instance variables.
         *
         * This is a length 1 array because:
         *   1. GCC has a bug that does not optimize C flexible array members
         *      (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102452)
         *   2. Zero length arrays are not supported by all compilers
         */
        VALUE ary[1];
    } as;
};
 
RBIMPL_ATTR_PURE_UNLESS_DEBUG()
RBIMPL_ATTR_ARTIFICIAL()
static inline VALUE *
ROBJECT_IVPTR(VALUE obj)
{
    RBIMPL_ASSERT_TYPE(obj, RUBY_T_OBJECT);
 
    struct RObject *const ptr = ROBJECT(obj);
 
    if (RB_FL_ANY_RAW(obj, ROBJECT_EMBED)) {
        return ptr->as.ary;
    }
    else {
        return ptr->as.heap.ivptr;
    }
}
 
#endif /* RBIMPL_ROBJECT_H */