From fe237ad8085f34e89fcd3610a9771215af63f03f Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Wed, 1 Dec 1999 17:50:08 -0200
Subject: fixed stack; first version.

---
 lstate.h | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

(limited to 'lstate.h')

diff --git a/lstate.h b/lstate.h
index 2ee31840..1b946312 100644
--- a/lstate.h
+++ b/lstate.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lstate.h,v 1.22 1999/11/10 15:39:35 roberto Exp roberto $
+** $Id: lstate.h,v 1.23 1999/11/22 13:12:07 roberto Exp roberto $
 ** Global State
 ** See Copyright Notice in lua.h
 */
@@ -15,7 +15,7 @@
 
 
 
-typedef int StkId;  /* index to stack elements */
+typedef TObject *StkId;  /* index to stack elements */
 
 
 /*
@@ -27,17 +27,16 @@ struct lua_longjmp {
 };
 
 
-struct Stack {
-  TObject *top;
-  TObject *stack;
-  TObject *last;
-};
-
+/*
+** stack layout for C point of view:
+** [lua2C, lua2C+num) - `array' lua2C
+** [lua2C+num, base)  - space for extra lua_Objects
+** [base, L->top)     - `stack' C2Lua
+*/
 struct C_Lua_Stack {
-  StkId base;  /* when Lua calls C or C calls Lua, points to */
-               /* the first slot after the last parameter. */
-  StkId lua2C; /* points to first element of "array" lua2C */
-  int num;     /* size of "array" lua2C */
+  StkId base;
+  StkId lua2C;
+  int num;
 };
 
 
@@ -51,7 +50,9 @@ typedef struct stringtable {
 
 struct lua_State {
   /* thread-specific state */
-  struct Stack stack;  /* Lua stack */
+  StkId top;  /* first free slot in the stack */
+  StkId stack;  /* stack base */
+  StkId stack_last;  /* last free slot in the stack */
   struct C_Lua_Stack Cstack;  /* C2lua struct */
   struct lua_longjmp *errorJmp;  /* current error recover point */
   char *Mbuffer;  /* global buffer */
-- 
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