fix bugs around compilation

Makefile

@@ -1,7 +1,7 @@
 all: build run
 
 build:
-	gcc -o bin/picrin -I./include src/main.c src/state.c src/gc.c
+	gcc -o bin/picrin -I./include src/main.c src/state.c src/gc.c src/pair.c src/write.c src/symbol.c src/value.c
 
 clean:
 	rm bin/picrin

include/picrin.h

@@ -1,6 +1,8 @@
 #ifndef PICRIN_H__
 #define PICRIN_H__
 
+#include <stddef.h>
+
 #include "picrin/value.h"
 
 typedef struct {

include/picrin/value.h

@@ -39,12 +39,12 @@ struct pic_symbol {
   char *name;
 };
 
-#define pic_pair_ptr(o) ((struct pic_pair *)o->u->data)
+#define pic_pair_ptr(o) ((struct pic_pair *)o.u.data)
-#define pic_symbol_ptr(o) ((struct pic_symbol *)o->u->data)
+#define pic_symbol_ptr(o) ((struct pic_symbol *)o.u.data)
 
-enum pic_tt pic_type(pic_value v);
+enum pic_tt pic_type(pic_value);
 
 pic_value pic_nil_value();
-pic_value pic_obj_value(struct pic_object *obj);
+pic_value pic_obj_value(void *);
 
 #endif

src/pair.c

@@ -17,7 +17,7 @@ pic_car(pic_state *pic, pic_value obj)
 {
   struct pic_pair *pair;
 
-  pair = (struct pic_pair *)obj->u->data;
+  pair = (struct pic_pair *)obj.u.data;
 
   return pair->car;
 }
@@ -27,7 +27,7 @@ pic_cdr(pic_state *pic, pic_value obj)
 {
   struct pic_pair *pair;
 
-  pair = (struct pic_pair *)obj->u->data;
+  pair = (struct pic_pair *)obj.u.data;
 
   return pair->cdr;
 }

src/symbol.c

@@ -3,7 +3,7 @@
 #include "picrin.h"
 
 pic_value
-pic_intern_cstr(pic_state *pic, char *name)
+pic_intern_cstr(pic_state *pic, const char *name)
 {
   struct pic_symbol *sym;
   size_t len;

src/value.c

@@ -3,11 +3,11 @@
 enum pic_tt
 pic_type(pic_value v)
 {
-  switch (v->type) {
+  switch (v.type) {
   case PIC_VTYPE_NIL:
     return PIC_TT_NIL;
   case PIC_VTYPE_HEAP:
-    return v->u->data->tt;
+    return ((struct pic_object *)v.u.data)->tt;
   }
 }
 
@@ -16,17 +16,17 @@ pic_nil_value()
 {
   pic_value v;
 
-  v.vtype = PIC_VTYPE_NIL;
+  v.type = PIC_VTYPE_NIL;
   v.u.data = NULL;
   return v;
 }
 
 pic_value
-pic_obj_value(struct pic_object *obj)
+pic_obj_value(void *ptr)
 {
   pic_value v;
 
-  v.vtype = PIC_VTYPE_HEAP;
+  v.type = PIC_VTYPE_HEAP;
-  v.u.data = obj;
+  v.u.data = ptr;
   return v;
 }