Store token first column number on RNode

* node.c (A_NODE_HEADER): Print column number.
* node.h (nd_column, nd_set_column): Define getter/setter
  macros for column number of RNode.
* parse.y: Set first column number of tokens.

Notes:

* Use `@n` to get the location of token in parse.y.
* When we use `@n`, arguments of yyerror and yylex are
  changed.
* Initialize column of nodes with -1 to make it easy
  to detect nodes which we forget to set a column number.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60220 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

node.c

@@ -23,7 +23,7 @@
 #define A_LONG(val) rb_str_catf(buf, "%ld", (val))
 #define A_LIT(lit) AR(rb_inspect(lit))
 #define A_NODE_HEADER(node, term) \
-    rb_str_catf(buf, "@ %s (line: %d)"term, ruby_node_name(nd_type(node)), nd_line(node))
+    rb_str_catf(buf, "@ %s (line: %d, column: %d)"term, ruby_node_name(nd_type(node)), nd_line(node), nd_column(node))
 #define A_FIELD_HEADER(len, name, term) \
     rb_str_catf(buf, "+- %.*s:"term, (len), (name))
 #define D_FIELD_HEADER(len, name, term) (A_INDENT, A_FIELD_HEADER(len, name, term))

node.h

@@ -284,6 +284,8 @@ typedef struct RNode {
 #define nd_line(n) (int)(((SIGNED_VALUE)RNODE(n)->flags)>>NODE_LSHIFT)
 #define nd_set_line(n,l) \
     RNODE(n)->flags=((RNODE(n)->flags&~((VALUE)(-1)<<NODE_LSHIFT))|((VALUE)((l)&NODE_LMASK)<<NODE_LSHIFT))
+#define nd_column(n) (int)(RNODE(n)->nd_reserved)
+#define nd_set_column(n, v) (RNODE(n)->nd_reserved=v)
 
 #define nd_head  u1.node
 #define nd_alen  u2.argc