committed new stack modification method

--HG--
extra : convert_revision : svn%3A39bc706e-5318-0410-9160-8a85361fbb7c/trunk%40122

sourcepawn/compiler/sc1.c

@@ -1972,6 +1972,7 @@ static int declloc(int fstatic)
       } /* if */
       markexpr(sLDECL,name,-declared*sizeof(cell)); /* mark for better optimization */
       modstk(-(int)size*sizeof(cell));
+      markstack(MEMUSE_STATIC, size);
       assert(curfunc!=NULL);
       assert((curfunc->usage & uNATIVE)==0);
       if (curfunc->x.stacksize<declared+1)
@@ -3334,6 +3335,7 @@ static int newfunc(char *firstname,int firsttag,int fpublic,int fstatic,int stoc
     sc_alignnext=FALSE;
   } /* if */
   declared=0;           /* number of local cells */
+  resetstacklist();
   rettype=(sym->usage & uRETVALUE);      /* set "return type" variable */
   curfunc=sym;
   define_args();        /* add the symbolic info for the function arguments */
@@ -3361,7 +3363,7 @@ static int newfunc(char *firstname,int firsttag,int fpublic,int fstatic,int stoc
      * has only a single statement in its body (no compound block) and that
      * statement declares a new variable
      */
-    modstk((int)declared*sizeof(cell)); /* remove all local variables */
+    popstacklist();
     declared=0;
   } /* if */
   if ((lastst!=tRETURN) && (lastst!=tGOTO)){
@@ -4770,6 +4772,7 @@ static void compound(int stmt_sameline,int starttok)
   int block_start=fline;  /* save line where the compound block started */
   int endtok;
 
+  pushstacklist();
   /* if there is more text on this line, we should adjust the statement indent */
   if (stmt_sameline) {
     int i;
@@ -4808,8 +4811,9 @@ static void compound(int stmt_sameline,int starttok)
   } /* while */
   if (lastst!=tRETURN)
     destructsymbols(&loctab,nestlevel);
-  if (lastst!=tRETURN && lastst!=tGOTO)
-    modstk((int)(declared-save_decl)*sizeof(cell)); /* delete local variable space */
+  if (lastst!=tRETURN && lastst!=tGOTO) {
+    popstacklist();
+  }
   testsymbols(&loctab,nestlevel,FALSE,TRUE);        /* look for unused block locals */
   declared=save_decl;
   delete_symbols(&loctab,nestlevel,FALSE,TRUE);     /* erase local symbols, but
@@ -5069,6 +5073,7 @@ static int dofor(void)
   save_decl=declared;
   save_nestlevel=nestlevel;
   save_endlessloop=endlessloop;
+  pushstacklist();
   
   addwhile(wq);
   skiplab=getlabel();
@@ -5094,8 +5099,11 @@ static int dofor(void)
    */
   ptr=readwhile();
   assert(ptr!=NULL);
-  ptr[wqBRK]=(int)declared;
-  ptr[wqCONT]=(int)declared;
+  /*ptr[wqBRK]=(int)declared;
+   *ptr[wqCONT]=(int)declared;
+   */
+  ptr[wqBRK] = stackusage->list_id;
+  ptr[wqCONT] = stackusage->list_id;
   jumplabel(skiplab);               /* skip expression 3 1st time */
   setlabel(wq[wqLOOP]);             /* "continue" goes to this label: expr3 */
   setline(TRUE);
@@ -5135,7 +5143,7 @@ static int dofor(void)
      * variable in "expr1".
      */
     destructsymbols(&loctab,nestlevel);
-    modstk((int)(declared-save_decl)*sizeof(cell));
+    popstacklist();
     testsymbols(&loctab,nestlevel,FALSE,TRUE);  /* look for unused block locals */
     declared=save_decl;
     delete_symbols(&loctab,nestlevel,FALSE,TRUE);
@@ -5152,7 +5160,7 @@ static int dofor(void)
  * 2. only one instruction may appear below each case, use a compound
  *    instruction to execute multiple instructions
  * 3. the "case" keyword accepts a comma separated list of values to
- *    match, it also accepts a range using the syntax "1 .. 4"
+ *    match
  *
  * SWITCH param
  *   PRI = expression result
@@ -5349,6 +5357,8 @@ static void dolabel(void)
   /* since one can jump around variable declarations or out of compound
    * blocks, the stack must be manually adjusted
    */
+  //:TODO: This is actually generated, egads!
+  //We have to support this and LCTRL/SCTRL
   setstk(-declared*sizeof(cell));
   sym->usage|=uDEFINE;  /* label is now defined */
 }
@@ -5496,8 +5506,7 @@ static void doreturn(void)
     rettype|=uRETNONE;                  /* function does not return anything */
   } /* if */
   destructsymbols(&loctab,0);           /* call destructor for *all* locals */
-  modstk((int)declared*sizeof(cell));   /* end of function, remove *all*
-                                         * local variables */
+  genstackfree(-1);						/* free everything on the stack */
   ffret(strcmp(curfunc->name,uENTRYFUNC)!=0);
 }
 
@@ -5511,7 +5520,7 @@ static void dobreak(void)
   if (ptr==NULL)
     return;
   destructsymbols(&loctab,nestlevel);
-  modstk(((int)declared-ptr[wqBRK])*sizeof(cell));
+  genstackfree(ptr[wqBRK]);
   jumplabel(ptr[wqEXIT]);
 }
 
@@ -5524,7 +5533,7 @@ static void docont(void)
   if (ptr==NULL)
     return;
   destructsymbols(&loctab,nestlevel);
-  modstk(((int)declared-ptr[wqCONT])*sizeof(cell));
+  genstackfree(ptr[wqCONT]);
   jumplabel(ptr[wqLOOP]);
 }
 

sourcepawn/compiler/sctracker.c

@@ -12,8 +12,14 @@ memuse_list_t *stackusage = NULL;
 void _push_memlist(memuse_list_t **head)
 {
   memuse_list_t *newlist = (memuse_list_t *)malloc(sizeof(memuse_list_t));
-  (*head)->prev = *head;
-  (*head)->head = NULL;
+  if (*head != NULL)
+  {
+    newlist->list_id = (*head)->list_id + 1;
+  } else {
+    newlist->list_id = 0;
+  }
+  newlist->prev = *head;
+  newlist->head = NULL;
   *head = newlist;
 }
 
@@ -52,6 +58,26 @@ int _mark_memlist(memuse_list_t *head, int type, int size)
   return size;
 }
 
+void _reset_memlist(memuse_list_t **head)
+{
+  memuse_list_t *curlist = *head;
+  memuse_list_t *tmplist;
+  while (curlist) {
+    memuse_t *curuse = curlist->head;
+    memuse_t *tmpuse;
+    while (curuse) {
+      tmpuse = curuse->prev;
+      free(curuse);
+      curuse = tmpuse;
+    }
+    tmplist = curlist->prev;
+    free(curlist);
+    curlist = tmplist;
+  }
+  *head = NULL;
+}
+
+
 /**
  * Wrapper for pushing the heap list
  */
@@ -99,8 +125,10 @@ void _heap_freeusage(memuse_list_t *heap)
 {
   memuse_t *cur=heap->head;
   memuse_t *tmp;
-  while (cur) {
-    if (cur->type == MEMUSE_STATIC) {
+  while (cur)
+  {
+    if (cur->type == MEMUSE_STATIC)
+	{
       modheap((-1)*cur->size*sizeof(cell));
     } else {
       modheap_i();
@@ -112,6 +140,34 @@ void _heap_freeusage(memuse_list_t *heap)
   heap->head=NULL;
 }
 
+void _stack_genusage(memuse_list_t *stack, int dofree)
+{
+  memuse_t *cur = stack->head;
+  memuse_t *tmp;
+  while (cur)
+  {
+    if (cur->type == MEMUSE_DYNAMIC)
+	{
+      /* no idea yet */
+      assert(0);
+	} else {
+      modstk(cur->size * sizeof(cell));
+	}
+	if (dofree)
+	{
+      tmp = cur->prev;
+      free(cur);
+      cur = tmp;
+	} else {
+      cur = cur->prev;
+	}
+  }
+  if (dofree)
+  {
+    stack->head = NULL;
+  }
+}
+
 /**
  * Pops a heap list and frees it.
  */
@@ -128,4 +184,30 @@ void popheaplist()
   heapusage=oldlist;
 }
 
+void genstackfree(int stop_id)
+{
+  memuse_list_t *curlist = stackusage;
+  while (curlist && curlist->list_id > stop_id)
+  {
+    _stack_genusage(curlist, 0);
+    curlist = curlist->prev;
+  }
+}
 
+void popstacklist()
+{
+  memuse_list_t *oldlist;
+  assert(stackusage != NULL);
+
+  _stack_genusage(stackusage, 1);
+  assert(stackusage->head==NULL);
+
+  oldlist = stackusage->prev;
+  free(stackusage);
+  stackusage = oldlist;
+}
+
+void resetstacklist()
+{
+  _reset_memlist(&stackusage);
+}

sourcepawn/compiler/sctracker.h

@@ -12,6 +12,7 @@ typedef struct memuse_s {
 
 typedef struct memuse_list_s {
   struct memuse_list_s *prev;   /* last used list */
+  int list_id;
   memuse_t *head;               /* head of the current list */
 } memuse_list_t;
 
@@ -29,6 +30,17 @@ int markheap(int type, int size);
 void pushstacklist();
 void popstacklist();
 int markstack(int type, int size);
+/**
+ * Generates code to free stack usage, but does not pop the list.  
+ *  This is used for code like dobreak()/docont()/doreturn().
+ * stop_id is the list at which to stop generating.
+ */
+void genstackfree(int stop_id);
+
+/**
+ * Resets the stack list by freeing everything
+ */
+void resetstacklist();
 
 extern memuse_list_t *heapusage;
 extern memuse_list_t *stackusage;