Ola:
I believe it is the T_MASK flag, but not entirely sure.
From Ruby 1.9: include/ruby/ruby.h:
#define BUILTIN_TYPE(x) (((struct RBasic*)(x))->flags & T_MASK)
This gets called from:
rb_type(VALUE obj)
{
if (IMMEDIATE_P(obj)) {
if (FIXNUM_P(obj)) return T_FIXNUM;
if (obj == Qtrue) return T_TRUE;
if (SYMBOL_P(obj)) return T_SYMBOL;
if (obj == Qundef) return T_UNDEF;
}
else if (!RTEST(obj)) {
if (obj == Qnil) return T_NIL;
if (obj == Qfalse) return T_FALSE;
}
return BUILTIN_TYPE(obj);
}
which gets mapped to:
#define TYPE(x) rb_type((VALUE)(x))
In rb_singleton_methods.c, this is used when iterating across the
superclasses:
while (klass && (FL_TEST(klass, FL_SINGLETON) || TYPE(klass)
== T_ICLASS)) {
This flag may also mean that it is an included class. If so, this may
be comparable to the JRuby implementation:
while (superClass.isIncluded()) {
The difference may instead come from how Ruby considers a class to be
included or not. From the documentation for the method, it is not
clear to me if this is defined behavior; the example provided in the
doc gives the same result in Ruby and JRuby.
Sorry for the newbie questions. Still orienting myself to the codebase.
Thanks,
Gerald
On 13-Aug-09, at 2:32 PM, Ola Bini wrote:
Gerald Boersma wrote:
Y'all:
In order to fix defect #3870, I need a check to see if a class is
"built-in". In the implementation of Ruby, there is a concept of a
"built-in" class. This is held in flags that are carried around
with the class information. As far as I can tell, this applies to
Object, Class, Module, etc. It keeps Ruby from returning singleton
methods for these classes, as an example.
Is there a similar concept in JRuby, or does it need to be built?
Or is there another (better) way?
What flag exactly is it you're trying to mimic?
--
Ola Bini (http://olabini.com)
Ioke creator (http://ioke.org)
JRuby Core Developer (http://jruby.org)
Developer, ThoughtWorks Studios (http://studios.thoughtworks.com)
Practical JRuby on Rails (http://apress.com/book/view/9781590598818)
"Yields falsehood when quined" yields falsehood when quined.
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