Fix indirect counter increment

nobu · nobu · commit ce47ee00ae29 · 2023-03-15T13:59:11.000+09:00
`*pcnt++` just dereferences `pcnt` then increments the local variable,
but has no side effect.
diff --git a/bootstraptest/test_ractor.rb b/bootstraptest/test_ractor.rb
@@ -1494,8 +1494,9 @@ class C
 
 # NameError
 assert_equal "ok", %q{
+  obj = "".freeze # NameError refers the receiver indirectly
   begin
-    bar
+    obj.bar
   rescue => err
   end
   begin
diff --git a/ractor.c b/ractor.c
@@ -3127,7 +3127,7 @@ obj_refer_only_shareables_p_i(VALUE obj, void *ptr)
     int *pcnt = (int *)ptr;
 
     if (!rb_ractor_shareable_p(obj)) {
-        *pcnt++;
+        ++*pcnt;
     }
 }
 

Original file line number	Diff line number	Diff line change
`@@ -3127,7 +3127,7 @@ obj_refer_only_shareables_p_i(VALUE obj, void *ptr)`
`3127`	`3127`	`int pcnt = (int )ptr;`
`3128`	`3128`
`3129`	`3129`	`if (!rb_ractor_shareable_p(obj)) {`
`3130`		`- *pcnt++;`
	`3130`	`+ ++*pcnt;`
`3131`	`3131`	`}`
`3132`	`3132`	`}`
`3133`	`3133`