[ruby-cvs:67766] yui-knk:r60585 (trunk): Use NODE_CASE2 if case expressions don't exist

[yui-knk at ruby-lang.org]

yui-knk	2017-10-31 09:46:30 +0900 (Tue, 31 Oct 2017)

  New Revision: 60585

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=60585

  Log:
    Use NODE_CASE2 if case expressions don't exist
    
    When NODE_WHEN is compiled by iseq_compile_each0,
    the node passed to compile_when is NODE_WHEN (not NODE_CASE).
    So we can not handle the location of NODE_CASE of
    case statements which don't have case expressions.
    
    e.g. :
    
    ```
    case; when 1; foo; when 2; bar; else baz; end
    ```
    
    This commit adds NODE_CASE2, and compiles it by
    iseq_compile_each0.
    
    * compile.c (compile_case): Does not call COMPILE_ when
      NODE_CASE does not have case expressions.
    * compile.c (compile_case2): Compile NODE_CASE2 by compile_case2.
    * compile.c (compile_when): Delete an obsoleted function.
    * compile.c (iseq_compile_each0): Compile NODE_CASE2.
    
    * ext/objspace/objspace.c (count_nodes): Add NODE_CASE2 case.
    
    * node.c (dump_node, rb_gc_mark_node): Add NODE_CASE2 case.
    
    * node.h (node_type): Add NODE_CASE2.
    * node.h (NEW_CASE2): Add a macro which generates NODE_CASE2.
    
    * parse.y: Generate NODE_CASE2 if case expressions don't exist.

  Modified files:
    trunk/compile.c
    trunk/ext/objspace/objspace.c
    trunk/node.c
    trunk/node.h
    trunk/parse.y