diff --git a/js/src/jsemit.c b/js/src/jsemit.c
index fb5815fd63e..9cb39561ce2 100644
--- a/js/src/jsemit.c
+++ b/js/src/jsemit.c
@@ -3078,6 +3078,21 @@ bad:
     goto out;
 }
 
+JSBool
+js_EmitFunctionBytecode(JSContext *cx, JSCodeGenerator *cg, JSParseNode *body)
+{
+    if (!js_AllocTryNotes(cx, cg))
+        return JS_FALSE;
+
+    if (cg->treeContext.flags & TCF_FUN_IS_GENERATOR) {
+        if (js_Emit1(cx, cg, JSOP_GENERATOR) < 0)
+            return JS_FALSE;
+    }
+
+    return js_EmitTree(cx, cg, body) &&
+           js_Emit1(cx, cg, JSOP_STOP) >= 0;
+}
+
 JSBool
 js_EmitFunctionBody(JSContext *cx, JSCodeGenerator *cg, JSParseNode *body,
                     JSFunction *fun)
@@ -3086,9 +3101,6 @@ js_EmitFunctionBody(JSContext *cx, JSCodeGenerator *cg, JSParseNode *body,
     JSObject *funobj;
     JSBool ok;
 
-    if (!js_AllocTryNotes(cx, cg))
-        return JS_FALSE;
-
     fp = cx->fp;
     funobj = fun->object;
     JS_ASSERT(!fp || (fp->fun != fun && fp->varobj != funobj &&
@@ -3101,10 +3113,7 @@ js_EmitFunctionBody(JSContext *cx, JSCodeGenerator *cg, JSParseNode *body,
                   ? JSFRAME_COMPILING | JSFRAME_COMPILE_N_GO
                   : JSFRAME_COMPILING;
     cx->fp = &frame;
-    ok = (!(cg->treeContext.flags & TCF_FUN_IS_GENERATOR) ||
-          js_Emit1(cx, cg, JSOP_GENERATOR) >= 0) &&
-         js_EmitTree(cx, cg, body) &&
-         js_Emit1(cx, cg, JSOP_STOP) >= 0;
+    ok = js_EmitFunctionBytecode(cx, cg, body);
     cx->fp = fp;
     if (!ok)
         return JS_FALSE;
diff --git a/js/src/jsemit.h b/js/src/jsemit.h
index 585784b3625..90709c22ae9 100644
--- a/js/src/jsemit.h
+++ b/js/src/jsemit.h
@@ -478,6 +478,12 @@ js_LexicalLookup(JSTreeContext *tc, JSAtom *atom, jsint *slotp,
 extern JSBool
 js_EmitTree(JSContext *cx, JSCodeGenerator *cg, JSParseNode *pn);
 
+/*
+ * Emit function code into cg for the tree rooted at body.
+ */
+extern JSBool
+js_EmitFunctionBytecode(JSContext *cx, JSCodeGenerator *cg, JSParseNode *body);
+
 /*
  * Emit code into cg for the tree rooted at body, then create a persistent
  * script for fun from cg.
diff --git a/js/src/jsparse.c b/js/src/jsparse.c
index 46eca539a29..8a69887bb40 100644
--- a/js/src/jsparse.c
+++ b/js/src/jsparse.c
@@ -756,9 +756,7 @@ FunctionBody(JSContext *cx, JSTokenStream *ts, JSFunction *fun,
             JSCodeGenerator *cg = (JSCodeGenerator *) tc;
 
             if (!js_FoldConstants(cx, pn, tc) ||
-                !js_AllocTryNotes(cx, cg) ||
-                !js_EmitTree(cx, cg, pn) ||
-                js_Emit1(cx, cg, JSOP_STOP) < 0) {
+                !js_EmitFunctionBytecode(cx, cg, pn)) {
                 pn = NULL;
             }
         }