flambda-backend: Move unboxed types modules to stdlib_upstream_compatible (#2588)

* Move unboxed types to `stdlib_upstream_compatible`

* Search-and-replace moved modules in tests

* Disable upstream compatibility warnings on external declarations

* Fix includes

* Promote changed tests

* Modify `lib-extensions` tests

---------

Co-authored-by: Diana Kalinichenko <dkalinichenko@janestreet.com>

Author: dkalinichenko-js

otherlibs/stable/dune

@@ -44,18 +44,10 @@
  (deps
   (glob_files ../stdlib_stable/*.{ml,mli}))
  (targets
-  float_u.ml
-  float_u.mli
   iarray.ml
   iarray.mli
   iarrayLabels.ml
   iarrayLabels.mli
-  int32_u.ml
-  int32_u.mli
-  int64_u.ml
-  int64_u.mli
-  nativeint_u.ml
-  nativeint_u.mli
   stable.ml
   stable.mli)
  (action

otherlibs/stdlib_stable/stdlib_stable.ml

@@ -1,6 +1,2 @@
-module Float_u = Float_u
-module Int32_u = Int32_u
-module Int64_u = Int64_u
-module Nativeint_u = Nativeint_u
 module Iarray = Iarray
 module IarrayLabels = IarrayLabels

otherlibs/stdlib_stable/stdlib_stable.mli

@@ -1,6 +1,2 @@
-module Float_u = Float_u
-module Int32_u = Int32_u
-module Int64_u = Int64_u
-module Nativeint_u = Nativeint_u
 module Iarray = Iarray
 module IarrayLabels = IarrayLabels

otherlibs/stdlib_stable/float_u.ml renamed to otherlibs/stdlib_upstream_compatible/float_u.ml

@@ -19,9 +19,9 @@ open! Stdlib
 
 type t = float#
 
-external to_float : t -> (float[@local_opt]) = "%box_float"
+external to_float : t -> (float[@local_opt]) = "%box_float" [@@warning "-187"]
 
-external of_float : (float[@local_opt]) -> t = "%unbox_float"
+external of_float : (float[@local_opt]) -> t = "%unbox_float" [@@warning "-187"]
 
 (* CR layouts: Investigate whether it's worth making these things externals.
    Are there situations where the middle-end won't inline them and remove the

otherlibs/stdlib_stable/float_u.mli renamed to otherlibs/stdlib_upstream_compatible/float_u.mli

@@ -51,10 +51,10 @@ type t = float#
    [infinity]) when we we support [float64]s in structures. *)
 
 (* Unboxed-specific stuff at the top. *)
-external to_float : t -> (float[@local_opt]) = "%box_float"
+external to_float : t -> (float[@local_opt]) = "%box_float" [@@warning "-187"]
 (** Box a [float#] *)
 
-external of_float : (float[@local_opt]) -> t = "%unbox_float"
+external of_float : (float[@local_opt]) -> t = "%unbox_float" [@@warning "-187"]
 (** Unbox a boxed [float] *)
 
 (* Below here, everything also appears in [Float], though most things are

otherlibs/stdlib_stable/int32_u.ml renamed to otherlibs/stdlib_upstream_compatible/int32_u.ml

@@ -19,9 +19,9 @@ open! Stdlib
 
 type t = int32#
 
-external to_int32 : t -> (int32[@local_opt]) = "%box_int32"
+external to_int32 : t -> (int32[@local_opt]) = "%box_int32" [@@warning "-187"]
 
-external of_int32 : (int32[@local_opt]) -> t = "%unbox_int32"
+external of_int32 : (int32[@local_opt]) -> t = "%unbox_int32" [@@warning "-187"]
 
 let[@inline always] neg x = of_int32 (Int32.neg (to_int32 x))
 

otherlibs/stdlib_stable/int32_u.mli renamed to otherlibs/stdlib_upstream_compatible/int32_u.mli

@@ -43,10 +43,10 @@ type t = int32#
 *)
 
 (* Unboxed-specific stuff at the top. *)
-external to_int32 : t -> (int32[@local_opt]) = "%box_int32"
+external to_int32 : t -> (int32[@local_opt]) = "%box_int32" [@@warning "-187"]
 (** Box a [int32#] *)
 
-external of_int32 : (int32[@local_opt]) -> t = "%unbox_int32"
+external of_int32 : (int32[@local_opt]) -> t = "%unbox_int32" [@@warning "-187"]
 (** Unbox a boxed [int32] *)
 
 (* Below here, everything also appears in [Int32], though most things are

otherlibs/stdlib_stable/int64_u.ml renamed to otherlibs/stdlib_upstream_compatible/int64_u.ml

@@ -19,9 +19,9 @@ open! Stdlib
 
 type t = int64#
 
-external to_int64 : t -> (int64[@local_opt]) = "%box_int64"
+external to_int64 : t -> (int64[@local_opt]) = "%box_int64" [@@warning "-187"]
 
-external of_int64 : (int64[@local_opt]) -> t = "%unbox_int64"
+external of_int64 : (int64[@local_opt]) -> t = "%unbox_int64" [@@warning "-187"]
 
 let[@inline always] neg x = of_int64 (Int64.neg (to_int64 x))
 

otherlibs/stdlib_stable/int64_u.mli renamed to otherlibs/stdlib_upstream_compatible/int64_u.mli

@@ -43,10 +43,10 @@ type t = int64#
 *)
 
 (* Unboxed-specific stuff at the top. *)
-external to_int64 : t -> (int64[@local_opt]) = "%box_int64"
+external to_int64 : t -> (int64[@local_opt]) = "%box_int64" [@@warning "-187"]
 (** Box a [int64#] *)
 
-external of_int64 : (int64[@local_opt]) -> t = "%unbox_int64"
+external of_int64 : (int64[@local_opt]) -> t = "%unbox_int64" [@@warning "-187"]
 (** Unbox a boxed [int64] *)
 
 (* Below here, everything also appears in [Int64], though most things are

otherlibs/stdlib_stable/nativeint_u.ml renamed to otherlibs/stdlib_upstream_compatible/nativeint_u.ml

@@ -19,10 +19,10 @@ open! Stdlib
 
 type t = nativeint#
 
-external to_nativeint : t -> (nativeint[@local_opt]) = "%box_nativeint"
+external to_nativeint : t -> (nativeint[@local_opt]) = "%box_nativeint" [@@warning "-187"]
 
 external of_nativeint : (nativeint[@local_opt]) -> t =
-  "%unbox_nativeint"
+  "%unbox_nativeint" [@@warning "-187"]
 
 let[@inline always] neg x = of_nativeint (Nativeint.neg (to_nativeint x))
 

otherlibs/stdlib_stable/nativeint_u.mli renamed to otherlibs/stdlib_upstream_compatible/nativeint_u.mli

@@ -44,11 +44,11 @@ type t = nativeint#
 *)
 
 (* Unboxed-specific stuff at the top. *)
-external to_nativeint : t -> (nativeint[@local_opt]) = "%box_nativeint"
+external to_nativeint : t -> (nativeint[@local_opt]) = "%box_nativeint" [@@warning "-187"]
 (** Box a [nativeint#] *)
 
 external of_nativeint : (nativeint[@local_opt]) -> t =
-  "%unbox_nativeint"
+  "%unbox_nativeint" [@@warning "-187"]
 (** Unbox a boxed [nativeint] *)
 
 (* Below here, everything also appears in [Nativeint], though most things are

otherlibs/stdlib_upstream_compatible/stdlib_upstream_compatible.ml

@@ -0,0 +1,4 @@
+module Float_u = Float_u
+module Int32_u = Int32_u
+module Int64_u = Int64_u
+module Nativeint_u = Nativeint_u

otherlibs/stdlib_upstream_compatible/stdlib_upstream_compatible.mli

@@ -0,0 +1,4 @@
+module Float_u = Float_u
+module Int32_u = Int32_u
+module Int64_u = Int64_u
+module Nativeint_u = Nativeint_u

otherlibs/upstream_compatible/dune

@@ -44,7 +44,17 @@
 (rule
  (deps
   (glob_files ../stdlib_upstream_compatible/*.{ml,mli}))
- (targets upstream_compatible.ml upstream_compatible.mli)
+ (targets
+  float_u.ml
+  float_u.mli
+  int32_u.ml
+  int32_u.mli
+  int64_u.ml
+  int64_u.mli
+  nativeint_u.ml
+  nativeint_u.mli
+  upstream_compatible.ml
+  upstream_compatible.mli)
  (action
   (bash
    "cp ../stdlib_upstream_compatible/*.{ml,mli} .; mv stdlib_upstream_compatible.ml upstream_compatible.ml; mv stdlib_upstream_compatible.mli upstream_compatible.mli")))

testsuite/tests/mixed-blocks/constructor_args.ml

@@ -2,7 +2,7 @@
    flags = "-extension layouts_beta -extension small_numbers";
    include beta;
    flambda2;
-   include stable;
+   include stdlib_upstream_compatible;
    {
    native;
    }{
@@ -15,10 +15,10 @@
 
 module Float32_u = Beta.Float32_u
 module Float32 = Beta.Float32
-module Float_u = Stable.Float_u
-module Int32_u = Stable.Int32_u
-module Int64_u = Stable.Int64_u
-module Nativeint_u = Stable.Nativeint_u
+module Float_u = Stdlib_upstream_compatible.Float_u
+module Int32_u = Stdlib_upstream_compatible.Int32_u
+module Int64_u = Stdlib_upstream_compatible.Int64_u
+module Nativeint_u = Stdlib_upstream_compatible.Nativeint_u
 
 let print_floatu prefix x = Printf.printf "%s: %.2f\n" prefix (Float_u.to_float x)
 let print_float prefix x = Printf.printf "%s: %.2f\n" prefix x

testsuite/tests/mixed-blocks/generate_mixed_blocks_code.ml

@@ -233,11 +233,11 @@ let type_to_field_integrity_check type_ ~access1 ~access2 ~message =
     | Str -> "check_string", None
     | Imm -> "check_int", None
     | Float -> "check_float", None
-    | Float64 -> "check_float", Some "Stable.Float_u.to_float"
+    | Float64 -> "check_float", Some "Stdlib_upstream_compatible.Float_u.to_float"
     | Float32 -> "check_float32", Some "Beta.Float32_u.to_float32"
-    | Bits32 -> "check_int32", Some "Stable.Int32_u.to_int32"
-    | Bits64 -> "check_int64", Some "Stable.Int64_u.to_int64"
-    | Word -> "check_int", Some "Stable.Nativeint_u.to_int"
+    | Bits32 -> "check_int32", Some "Stdlib_upstream_compatible.Int32_u.to_int32"
+    | Bits64 -> "check_int64", Some "Stdlib_upstream_compatible.Int64_u.to_int64"
+    | Word -> "check_int", Some "Stdlib_upstream_compatible.Nativeint_u.to_int"
   in
   let transform access =
     match transformation with
@@ -567,7 +567,7 @@ let main n ~bytecode =
   line {|(* TEST
  flags = "-extension layouts_beta -extension small_numbers";
  include beta;
- include stable;|};
+ include stdlib_upstream_compatible;|};
   if bytecode then (
     line {| bytecode;|};
   ) else (
@@ -582,11 +582,11 @@ let main n ~bytecode =
   line {|let create_int () = Random.int 0x3FFF_FFFF|};
   line {|let create_float () = Random.float Float.max_float|};
   line {|let create_float32 () = Beta.Float32.of_float (Random.float Float.max_float)|};
-  line {|let create_float_u () = Stable.Float_u.of_float (create_float ())|};
+  line {|let create_float_u () = Stdlib_upstream_compatible.Float_u.of_float (create_float ())|};
   line {|let create_float32_u () = Beta.Float32_u.of_float32 (create_float32 ())|};
-  line {|let create_int32_u () = Stable.Int32_u.of_int32 (Random.int32 0x7FFF_FFFFl)|};
-  line {|let create_int64_u () = Stable.Int64_u.of_int64 (Random.int64 0x7FFF_FFFF_FFFF_FFFFL)|};
-  line {|let create_nativeint_u () = Stable.Nativeint_u.of_nativeint (Random.nativeint 0x7FFF_FFFF_FFFF_FFFFn)|};
+  line {|let create_int32_u () = Stdlib_upstream_compatible.Int32_u.of_int32 (Random.int32 0x7FFF_FFFFl)|};
+  line {|let create_int64_u () = Stdlib_upstream_compatible.Int64_u.of_int64 (Random.int64 0x7FFF_FFFF_FFFF_FFFFL)|};
+  line {|let create_nativeint_u () = Stdlib_upstream_compatible.Nativeint_u.of_nativeint (Random.nativeint 0x7FFF_FFFF_FFFF_FFFFn)|};
   line
     {|let check_gen ~equal ~to_string ~message y1 y2 =
   if equal y1 y2 then () else