remove pic->native_stack_start

extlib/benz/include/picrin/private/state.h

@@ -59,10 +59,10 @@ struct pic_state {
   pic_value globals;            /* weak */
   pic_value macros;             /* weak */
   khash_t(ltable) ltable;
-  struct list_head ireps;        /* chain */
+  struct list_head ireps;
 
   xFILE files[XOPEN_MAX];
-  struct code iseq[2];             /* for pic_apply_trampoline */
+  struct code iseq[2];          /* for pic_apply_trampoline */
 
   bool gc_enable;
   struct heap *heap;
@@ -70,9 +70,8 @@ struct pic_state {
   size_t arena_size, arena_idx;
 
   pic_value err;
-  pic_panicf panicf;
 
-  char *native_stack_start;
+  pic_panicf panicf;
 };
 
 #if defined(__cplusplus)

extlib/benz/state.c

@@ -190,8 +190,6 @@ pic_init_core(pic_state *pic)
 pic_state *
 pic_open(pic_allocf allocf, void *userdata)
 {
-  char t;
-
   pic_state *pic;
 
   pic = allocf(userdata, NULL, sizeof(pic_state));
@@ -284,9 +282,6 @@ pic_open(pic_allocf allocf, void *userdata)
   xfopen_null(pic, "w");
 #endif
 
-  /* native stack marker */
-  pic->native_stack_start = &t;
-
   /* root tables */
   pic->globals = pic_make_weak(pic);
   pic->macros = pic_make_weak(pic);