From a580480b07cdf7201306b246deeb2fe84f2c25a9 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Fri, 26 Sep 1997 12:02:26 -0300
Subject: new implementation for globals: Global value is stored in
 TaggedString

---
 lobject.h | 113 ++++++++++++++++++++++++++++++--------------------------------
 1 file changed, 55 insertions(+), 58 deletions(-)

(limited to 'lobject.h')

diff --git a/lobject.h b/lobject.h
index 710d4a6a..398155f2 100644
--- a/lobject.h
+++ b/lobject.h
@@ -1,5 +1,5 @@
 /*
-** $Id: $
+** $Id: lobject.h,v 1.1 1997/09/16 19:25:59 roberto Exp roberto $
 ** Type definitions for Lua objects
 ** See Copyright Notice in lua.h
 */
@@ -29,30 +29,43 @@ typedef unsigned short Word;  /* unsigned 16 bits */
 typedef unsigned int IntPoint; /* unsigned with same size as a pointer (for hashing) */
 
 
-
-
 /*
-** String headers for string table
+** Lua TYPES
+** WARNING: if you change the order of this enumeration,
+** grep "ORDER LUA_T"
 */
+typedef enum {
+  LUA_T_NIL      = -10,
+  LUA_T_NUMBER   = -9,
+  LUA_T_STRING   = -8,
+  LUA_T_ARRAY    = -7,  /* array==table */
+  LUA_T_PROTO    = -6,
+  LUA_T_FUNCTION = -5,
+  LUA_T_CFUNCTION= -4,
+  LUA_T_MARK     = -3,
+  LUA_T_CMARK    = -2,
+  LUA_T_LINE     = -1,
+  LUA_T_USERDATA = 0
+} lua_Type;
 
-#define NOT_USED  0xFFFE
+#define NUM_TYPES 11
+
+
+typedef union {
+  lua_CFunction f;  /* LUA_T_CFUNCTION, LUA_T_CMARK */
+  real n;  /* LUA_T_NUMBER */
+  struct TaggedString *ts;  /* LUA_T_STRING, LUA_T_USERDATA */
+  struct TProtoFunc *tf;  /* LUA_T_PROTO */
+  struct Closure *cl;  /* LUA_T_FUNCTION, LUA_T_MARK */
+  struct Hash *a;  /* LUA_T_ARRAY */
+  int i;  /* LUA_T_LINE */
+} Value;
 
-typedef struct TaggedString {
-  int tag;  /* if != LUA_T_STRING, this is a userdata */
-  union {
-    unsigned long hash;
-    struct TaggedString *next;
-  } uu;
-  union {
-    struct {
-      Word varindex;  /* != NOT_USED  if this is a symbol */
-      Word constindex;  /* hint to reuse constant indexes */
-    } s;
-    void *v;  /* if this is a userdata, here is its value */
-  } u;
-  int marked;   /* for garbage collection; never collect (nor change) if > 1 */
-  char str[1];   /* \0 byte already reserved */
-} TaggedString;
+
+typedef struct TObject {
+  lua_Type ttype;
+  Value value;
+} TObject;
 
 
 
@@ -65,6 +78,27 @@ typedef struct GCnode {
 } GCnode;
 
 
+/*
+** String headers for string table
+*/
+
+typedef struct TaggedString {
+  GCnode head;
+  int constindex;  /* hint to reuse constants (= -1 if this is a userdata) */
+  unsigned long hash;
+  union {
+    TObject globalval;
+    struct {
+      void *v;  /* if this is a userdata, here is its value */
+      int tag;
+    } d;
+  } u;
+  char str[1];   /* \0 byte already reserved */
+} TaggedString;
+
+
+
+
 /*
 ** Function Prototypes
 */
@@ -87,43 +121,6 @@ typedef struct LocVar {
 
 
 
-/*
-** Lua TYPES
-** WARNING: if you change the order of this enumeration,
-** grep "ORDER LUA_T"
-*/
-typedef enum {
-  LUA_T_NIL      = -10,
-  LUA_T_NUMBER   = -9,
-  LUA_T_STRING   = -8,
-  LUA_T_ARRAY    = -7,  /* array==table */
-  LUA_T_PROTO    = -6,
-  LUA_T_FUNCTION = -5,
-  LUA_T_CFUNCTION= -4,
-  LUA_T_MARK     = -3,
-  LUA_T_CMARK    = -2,
-  LUA_T_LINE     = -1,
-  LUA_T_USERDATA = 0
-} lua_Type;
-
-#define NUM_TYPES 11
-
-
-typedef union {
-  lua_CFunction f;
-  real n;
-  TaggedString *ts;
-  TProtoFunc *tf;
-  struct Closure *cl;
-  struct Hash *a;
-  int i;
-} Value;
-
-typedef struct TObject {
-  lua_Type ttype;
-  Value value;
-} TObject;
-
 
 /* Macros to access structure members */
 #define ttype(o)        ((o)->ttype)
-- 
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