garbage collection tag for strings organized in struct TaggedString

tree.h

@@ -1,34 +1,33 @@
 /*
 ** tree.h
 ** TecCGraf - PUC-Rio
-** $Id: tree.h,v 1.4 1994/11/17 13:58:57 roberto Exp roberto $
+** $Id: tree.h,v 1.5 1994/11/18 19:27:38 roberto Exp roberto $
 */
 
 #ifndef tree_h
 #define tree_h
 
-#include "opcode.h"
+
+#define NOT_USED  0xFFFE
 
 
-#define UNMARKED_STRING	0xFFFF
-#define MARKED_STRING   0xFFFE
-#define MAX_WORD        0xFFFD
-
+typedef struct TaggedString
+{
+  char marked;   /* for garbage collection */
+  char str[1];   /* \0 byte already reserved */
+} TaggedString;
  
 typedef struct TreeNode
 {
  struct TreeNode *right;
  struct TreeNode *left;
- Word varindex;  /* if this is a symbol */
- Word constindex;  /* if this is a constant; also used for garbage collection */
- char            str[1];        /* \0 byte already reserved */
+ unsigned short varindex;  /* != NOT_USED  if this is a symbol */
+ unsigned short constindex;  /* != NOT_USED  if this is a constant */
+ TaggedString ts;
 } TreeNode;
 
 
-#define indexstring(s) (*(((Word *)s)-1))
-
-
-char *lua_createstring (char *str);
+TaggedString *lua_createstring (char *str);
 TreeNode *lua_constcreate  (char *str);
 int  lua_strcollector (void);
 TreeNode *lua_varnext      (char *n);