From 448517e47e40814f6ee12eae8dd6c3120f1d48bb Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Fri, 18 Jan 2002 15:39:06 -0200
Subject: no more linehook field in CallInfo

---
 ldo.c    |  4 ++--
 lstate.h |  1 -
 lvm.c    | 18 ++++++++++++------
 3 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/ldo.c b/ldo.c
index e5fbc5f3..a9bb5ec1 100644
--- a/ldo.c
+++ b/ldo.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ldo.c,v 1.1 2001/11/29 22:14:34 rieru Exp rieru $
+** $Id: ldo.c,v 1.154 2002/01/11 20:27:41 roberto Exp $
 ** Stack and Call structure of Lua
 ** See Copyright Notice in lua.h
 */
@@ -148,12 +148,12 @@ StkId luaD_precall (lua_State *L, StkId func) {
   if (!cl->isC) {  /* Lua function? prepare its call */
     StkId base = func+1;
     Proto *p = cl->p;
-    ci->linehook = L->linehook;
     ci->savedpc = p->code;  /* starting point */
     if (p->is_vararg)  /* varargs? */
       adjust_varargs(L, base, p->numparams);
     if (base > L->stack_last - p->maxstacksize)
       luaD_stackerror(L);
+    ci->line = 0;
     ci->top = base + p->maxstacksize;
     while (L->top < ci->top)
       setnilvalue(L->top++);
diff --git a/lstate.h b/lstate.h
index 978ffbc1..a90daa5f 100644
--- a/lstate.h
+++ b/lstate.h
@@ -82,7 +82,6 @@ typedef struct stringtable {
 typedef struct CallInfo {
   StkId base;  /* base for called function */
   const Instruction *savedpc;
-  lua_Hook linehook;
   StkId	top;  /* top for this function (when it's a Lua function) */
   const Instruction **pc;
   /* extra information for line tracing */
diff --git a/lvm.c b/lvm.c
index b51ea0e0..0a980f7d 100644
--- a/lvm.c
+++ b/lvm.c
@@ -66,10 +66,17 @@ static void traceexec (lua_State *L, lua_Hook linehook) {
   int *lineinfo = ci_func(ci)->l.p->lineinfo;
   int pc = cast(int, *ci->pc - ci_func(ci)->l.p->code) - 1;
   int newline;
-  if (pc == 0) {  /* may be first time? */
-    ci->line = 1;
-    ci->refi = 0;
-    ci->lastpc = pc+1;  /* make sure it will call linehook */
+  if (ci->line == -1) return;  /* no linehooks for this function */
+  else if (ci->line == 0) {  /* first linehook? */
+    if (pc == 0) {  /* function is starting now? */
+      ci->line = 1;
+      ci->refi = 0;
+      ci->lastpc = pc+1;  /* make sure it will call linehook */
+    }
+    else {  /* function started without hooks: */
+      ci->line = -1;  /* keep it that way */
+      return;
+    }
   }
   newline = luaG_getline(lineinfo, pc, ci->line, &ci->refi);
   /* calls linehook when enters a new line or jumps back (loop) */
@@ -315,7 +322,7 @@ StkId luaV_execute (lua_State *L) {
   base = L->ci->base;
   cl = &clvalue(base - 1)->l;
   k = cl->p->k;
-  linehook = L->ci->linehook;
+  linehook = L->linehook;
   L->ci->pc = &pc;
   pc = L->ci->savedpc;
   L->ci->savedpc = NULL;
@@ -513,7 +520,6 @@ StkId luaV_execute (lua_State *L) {
           int nresults;
           lua_assert(ttype(ci->base-1) == LUA_TFUNCTION);
           base = ci->base;  /* restore previous values */
-          linehook = ci->linehook;
           cl = &clvalue(base - 1)->l;
           k = cl->p->k;
           pc = ci->savedpc;
-- 
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