MJIT: Use a String buffer in builtin compilers

instead of FILE*.

Using C.fprintf is slower than String manipulation on memory. I'm going
to change the way MJIT writes files, and this is a prerequisite for it.

1 files changed, 1 insertions, 1 deletions

diff --git a/builtin.h b/builtin.h
index 7ad52f44f4..38ad5a1629 100644
--- a/builtin.h
+++ b/builtin.h
@@ -13,7 +13,7 @@ struct rb_builtin_function {
     const char * const name;
 
     // for jit
-    void (*compiler)(FILE *, long, unsigned, bool);
+    void (*compiler)(VALUE, long, unsigned, bool);
 };
 
 #define RB_BUILTIN_FUNCTION(_i, _name, _fname, _arity, _compiler) {\