Ruby » Ruby master

• parse.y: support Symbol GC. [ruby-trunk Feature #9634]
  See this ticket about Symbol GC.

• include/ruby/ruby.h:
  Declare few functions.

  • rb_sym2id: almost same as old SYM2ID but support dynamic symbols.
  • rb_id2sym: almost same as old ID2SYM but support dynamic symbols.
  • rb_sym2str: almost same as rb_id2str(SYM2ID(sym)) but not
    pin down a dynamic symbol.
    Declare a new struct.
  • struct RSymbol: represents a dynamic symbol as object in
    Ruby's heaps.
    Add few macros.
  • STATIC_SYM_P: check a static symbol.
  • DYNAMIC_SYM_P: check a dynamic symbol.
  • RSYMBOL: cast to RSymbol

• gc.c: declare RSymbol. support T_SYMBOL.

• internal.h: Declare few functions.

  • rb_gc_free_dsymbol: free up a dynamic symbol. GC call this
    function at a sweep phase.
  • rb_str_dynamic_intern: convert a string to a dynamic symbol.
  • rb_check_id_without_pindown: not pinning function.
  • rb_sym2id_without_pindown: ditto.
  • rb_check_id_cstr_without_pindown: ditto.

• string.c (Init_String): String#intern and String#to_sym use
  rb_str_dynamic_intern.

• template/id.h.tmpl: use LSB of ID as a flag for determining a
  static symbol, so we shift left other ruby_id_types.

• string.c: use rb_sym2str instead rb_id2str(SYM2ID(sym)) to
  avoid pinning.

• load.c: use xx_without_pindown function at creating temporary ID
  to avoid pinning.

• object.c: ditto.

• sprintf.c: ditto.

• struct.c: ditto.

• thread.c: ditto.

• variable.c: ditto.

• vm_method.c: ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45426 b2dd03c8-39d4-4d8f-98ff-823fe69b080e