hoist out rb_call_info_kw_arg_bytes to inline function

* vm_core.h (rb_call_info_kw_arg_bytes): extract from compile.c
* compile.c (iseq_build_callinfo_from_hash): use above function

This will be use for implementing iseq_memsize

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51546 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Wed Aug 12 21:15:27 2015  Eric Wong  <e@80x24.org>
+
+	* vm_core.h (rb_call_info_kw_arg_bytes): extract from compile.c
+	* compile.c (iseq_build_callinfo_from_hash): use above function
+
 Wed Aug 12 18:00:17 2015  Koichi Sasada  <ko1@atdot.net>
 
 	* class.c (move_refined_method): same as the last commit.

compile.c

@@ -5917,7 +5917,7 @@ iseq_build_callinfo_from_hash(rb_iseq_t *iseq, VALUE op)
 	if (!NIL_P(vkw_arg)) {
 	    int i;
 	    int len = RARRAY_LENINT(vkw_arg);
-	    size_t n = sizeof(rb_call_info_kw_arg_t) + sizeof(VALUE) * (len - 1);
+	    size_t n = rb_call_info_kw_arg_bytes(len);
 
 	    kw_arg = xmalloc(n);
 	    kw_arg->keyword_len = len;

vm_core.h

@@ -180,6 +180,12 @@ typedef struct rb_call_info_kw_arg_struct {
     VALUE keywords[1];
 } rb_call_info_kw_arg_t;
 
+static inline size_t
+rb_call_info_kw_arg_bytes(int keyword_len)
+{
+    return sizeof(rb_call_info_kw_arg_t) + sizeof(VALUE) * (keyword_len - 1);
+}
+
 enum method_missing_reason {
     MISSING_NOENTRY   = 0x00,
     MISSING_PRIVATE   = 0x01,