Add comments in variable.c

src/variable.c

@@ -27,12 +27,21 @@ typedef struct segment {
   struct segment *next;
 } segment;
 
+/* Instance variable table structure */
 typedef struct iv_tbl {
   segment *rootseg;
   size_t size;
   size_t last_len;
 } iv_tbl;
 
+/*
+ * Creates instance variable table.
+ *
+ * Parameters
+ *   mrb
+ * Returns
+ *   the instance variable table.
+ */
 static iv_tbl*
 iv_new(mrb_state *mrb)
 {
@@ -47,6 +56,15 @@ iv_new(mrb_state *mrb)
   return t;
 }
 
+/*
+ * Set the value for the symbol in the instance variable table.
+ *
+ * Parameters
+ *   mrb
+ *   t     the instance variable table to be set in.
+ *   sym   the symbol to be used as the key.
+ *   val   the value to be set.
+ */
 static void
 iv_put(mrb_state *mrb, iv_tbl *t, mrb_sym sym, mrb_value val)
 {
@@ -59,7 +77,7 @@ iv_put(mrb_state *mrb, iv_tbl *t, mrb_sym sym, mrb_value val)
   while (seg) {
     for (i=0; i<MRB_SEGMENT_SIZE; i++) {
       mrb_sym key = seg->key[i];
-      /* found room in last segment after last_len */
+      /* Found room in last segment after last_len */
       if (!seg->next && i >= t->last_len) {
         seg->key[i] = sym;
         seg->val[i] = val;
@@ -80,7 +98,7 @@ iv_put(mrb_state *mrb, iv_tbl *t, mrb_sym sym, mrb_value val)
     seg = seg->next;
   }
 
-  /* not found */
+  /* Not found */
   t->size++;
   if (matched_seg) {
     matched_seg->key[matched_idx] = sym;
@@ -103,6 +121,18 @@ iv_put(mrb_state *mrb, iv_tbl *t, mrb_sym sym, mrb_value val)
   return;
 }
 
+/*
+ * Get a value for a symbol from the instance the variable table.
+ *
+ * Parameters
+ *   mrb
+ *   t     the variable table to be searched.
+ *   sym   the symbol to be used as the key.
+ *   vp    the value pointer. Recieves the value if if the specified symbol contains
+ *         in the instance variable table.
+ * Returns
+ *   true if the specfiyed symbol contains in the instance variable table.
+ */
 static mrb_bool
 iv_get(mrb_state *mrb, iv_tbl *t, mrb_sym sym, mrb_value *vp)
 {
@@ -127,6 +157,17 @@ iv_get(mrb_state *mrb, iv_tbl *t, mrb_sym sym, mrb_value *vp)
   return FALSE;
 }
 
+/*
+ * Deletes the value for the symbol from the instance variable table.
+ *
+ * Parameters
+ *   t    the variable table to be searched.
+ *   sym  the symbol to be used as the key.
+ *   vp   the value pointer. Recieve the deleted value if the symbol contans
+ *        in the instance varible table.
+ * Returns
+ *   true if the specfied symbol contains in the instance variable table.
+ */
 static mrb_bool
 iv_del(mrb_state *mrb, iv_tbl *t, mrb_sym sym, mrb_value *vp)
 {