save all ireps into pic_state

in order to decrease the stress GC will get, restore irep structures
under pic_state instead of under each procs and making it collectable object

include/picconf.h

@@ -4,6 +4,7 @@
 #define PIC_ARENA_SIZE 100
 #define PIC_HEAP_SIZE 8192
 #define PIC_STACK_SIZE 1024
+#define PIC_IREP_SIZE 256
 
 #define DEBUG 1
 

include/picrin.h

@@ -23,6 +23,9 @@ typedef struct {
   pic_value sADD, sSUB, sMUL, sDIV;
   struct pic_env *global_env;
 
+  struct pic_irep **irep;
+  size_t ilen, icapa;
+
   struct heap_page *heap;
   struct pic_object *arena[PIC_ARENA_SIZE];
   int arena_idx;

include/picrin/irep.h

@@ -30,9 +30,6 @@ struct pic_code {
 struct pic_irep {
   struct pic_code *code;
   size_t clen, ccapa;
-
-  struct pic_irep **proto;
-  size_t plen, pcapa;
 };
 
 #endif