Fix Recursive Modules on ocaml < 4.13 (#1485)

* Use caml_alloc_dummy_infix where it is needed
* Update changes
* Tests: allow to run some test with OCaml 4.12
* Fix caml_update_dummy

Co-authored-by: Hugo Heuzard <hugo.heuzard@gmail.com>

CHANGES.md

@@ -1,6 +1,7 @@
 # Dev (2023-??-??) - ??
 
 ## Bug fixes
+* Runtime: Fix recursive modules on ocaml < 4.13 (#1485)
 * Runtime: fix hashing of NaN (#1475)
 * Runtime: float rounding should resolve tie away from zero (#1475)
 * Runtime: fix Gc.stat, Gc.quick_stat, Gc.get (#1475)

compiler/tests-jsoo/dune

@@ -1,6 +1,19 @@
+(library
+ (name jsoo_testsuite_latest)
+ (modules test_io test_floats)
+ (libraries unix compiler-libs.common js_of_ocaml-compiler)
+ (enabled_if
+  (>= %{ocaml_version} 4.14))
+ (inline_tests
+  (modes js best))
+ (preprocess
+  (pps ppx_expect)))
+
 (library
  (name jsoo_testsuite)
- (libraries unix compiler-libs.common)
+ (modules
+  (:standard \ test_io test_floats))
+ (libraries unix compiler-libs.common js_of_ocaml-compiler)
  (foreign_stubs
   (language c)
   (names bigarray_stubs flush_stubs))

compiler/tests-jsoo/test_rec_mod.ml

@@ -17,6 +17,8 @@
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  *)
 
+open Js_of_ocaml_compiler.Stdlib
+
 (* https://github.com/ocaml/ocaml/pull/9497 *)
 (* Original test case from the issue: *)
 
@@ -36,7 +38,9 @@ let%expect_test _ =
     ignore (IdSet.mem { id = 1 } basic_set : bool)
     (* diverge here *)
   with e ->
-    assert (String.ends_with ~suffix:"Undefined recursive module" (Printexc.to_string e))
+    if String.is_suffix ~suffix:"Undefined recursive module" (Printexc.to_string e)
+    then ()
+    else raise e
 
 (* Looping version *)
 module rec M1 : sig

compiler/tests-jsoo/test_time.ml

@@ -17,9 +17,11 @@
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  *)
 
+open Js_of_ocaml_compiler.Stdlib
+
 let%expect_test _ =
   let f = Unix.time () in
-  let z, _integral = Float.modf f in
+  let z, _integral = modf f in
   match Float.classify_float f, Float.classify_float z with
   | FP_normal, FP_zero -> ()
   | _ -> assert false
@@ -49,7 +51,7 @@ let%expect_test _ =
     assert (
       String.length s > 0
       && String.for_all
-           (function
+           ~f:(function
              | '0' .. '9' | ' ' -> true
              | _ -> false)
            s)

runtime/internalMod.js

@@ -18,7 +18,7 @@
 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 
 //Provides: caml_CamlinternalMod_init_mod
-//Requires: caml_raise_with_arg, caml_global_data
+//Requires: caml_raise_with_arg, caml_global_data, caml_alloc_dummy_infix
 //If: !effects
 //Version: < 4.13
 function caml_CamlinternalMod_init_mod(loc,shape) {
@@ -29,7 +29,9 @@ function caml_CamlinternalMod_init_mod(loc,shape) {
     if(typeof shape === "number")
       switch(shape){
       case 0://function
-        struct[idx]={fun:undef_module};
+        var dummy=caml_alloc_dummy_infix();
+        dummy.fun=undef_module;
+        struct[idx]=dummy;
         break;
       case 1://lazy
         struct[idx]=[246, undef_module];
@@ -78,7 +80,7 @@ function caml_CamlinternalMod_update_mod(shape,real,x) {
 }
 
 //Provides: caml_CamlinternalMod_init_mod
-//Requires: caml_raise_with_arg, caml_global_data
+//Requires: caml_raise_with_arg, caml_global_data, caml_alloc_dummy_infix
 //If: effects
 //Version: < 4.13
 function caml_CamlinternalMod_init_mod(loc,shape,cont) {
@@ -89,7 +91,9 @@ function caml_CamlinternalMod_init_mod(loc,shape,cont) {
     if(typeof shape === "number")
       switch(shape){
       case 0://function
-        struct[idx]={fun:undef_module};
+        var dummy=caml_alloc_dummy_infix();
+        dummy.fun=undef_module;
+        struct[idx]=dummy;
         break;
       case 1://lazy
         struct[idx]=[246, undef_module];

runtime/obj.js

@@ -17,8 +17,8 @@
 
 //Provides: caml_update_dummy
 function caml_update_dummy (x, y) {
-  if( typeof y==="function" ) { x.fun = y; return 0; }
   if( y.fun ) { x.fun = y.fun; return 0; }
+  if( typeof y==="function" ) { x.fun = y; return 0; }
   var i = y.length; while (i--) x[i] = y[i]; return 0;
 }