RNode

From RubySpec

An RNode represents a node in the parsed AST of a Ruby script.

RNode has the following fields, in the form of two common fields and three unions

flags

???

nd_file

The name of the file from which this AST was generated

union u1

node

A link to the next node in the chain (?)

id

???

value

???

cfunc

???

tbl

???

union u2

node

A link to the next node in the chain (?)

id

???

argc

argument count

value

an object (??)

union u2

node

A link to the next node in the chain (?)

id

???

state

???

cnt

???

entry

???

value

???

typedef struct RNode {
    unsigned long flags;
    char *nd_file;
    union {
	struct RNode *node;
	ID id;
	VALUE value;
	VALUE (*cfunc)(ANYARGS);
	ID *tbl;
    } u1;
    union {
	struct RNode *node;
	ID id;
	long argc;
	VALUE value;
    } u2;
    union {
	struct RNode *node;
	ID id;
	long state;
	struct global_entry *entry;
	long cnt;
	VALUE value;
    } u3;
} NODE;