[OCaml] Fix segfaults when too few arguments are passed to a function

Prevent segfaults when too few arguments are passed to a function.

Length checks are not needed for the wrappers of overloaded
functions -- the generated dispatch function already checks.

Add default_args_runme.ml.

Fix minor errors in some runtime tests.  Extra args were being passed
in some cases.

Examples/ocaml/callback/runme.ml

@@ -18,7 +18,7 @@ let _ = print_endline "----------------------------------------"
 let callback = new_Callback '()
 let _ = caller -> "setCallback" (callback)
 let _ = caller -> "call" ()
-let _ = caller -> "delCallback" (0)
+let _ = caller -> "delCallback" ()
 
 let _ = print_endline "\nAdding and calling an OCaml callback"
 let _ = print_endline "------------------------------------"
@@ -26,5 +26,5 @@ let _ = print_endline "------------------------------------"
 let callback = new_derived_object new_Callback (new_OCamlCallback) '()
 let _  = caller -> "setCallback" (callback)
 let _  = caller -> "call" ()
-let _  = caller -> "delCallback" (0)
+let _  = caller -> "delCallback" ()
 let _  = print_endline "\nOCaml exit"

Examples/test-suite/ocaml/cpp_nodefault_runme.ml

@@ -12,7 +12,6 @@ let bar1 = new_Bar '()
 let gvar = _gvar '()
 let args = (C_list [ gvar ; foo2 ])
 let _ = bar1 -> "consume" (args)
-let args = '(1, 2)
+let foo3 = bar1 -> "create" (1, 2)
-let foo3 = bar1 -> "create" (args)
 let _ = foo3 -> "[a]" (6)
 let _ = assert ((foo3 -> "[a]" () as int) = 6)

Examples/test-suite/ocaml/default_args_runme.ml

@@ -0,0 +1,58 @@
+open Swig
+open Default_args
+
+let _ =
+  assert (_anonymous '() as int = 7771);
+  assert (_anonymous '(1234) as int = 1234);
+  assert (_booltest '() as bool = true);
+  assert (_booltest '(true) as bool = true);
+  assert (_booltest '(false) as bool = false);
+  let ec = new_EnumClass '() in
+  assert (ec -> blah () as bool = true);
+  let de = new_DerivedEnumClass '() in
+  assert (de -> accelerate () = C_void);
+  let args = _SLOW '() in
+  assert (de -> accelerate (args) = C_void);
+  assert (_Statics_staticmethod '() as int = 60);
+  assert (_cfunc1 '(1) as float = 2.);
+  assert (_cfunc2 '(1) as float = 3.);
+  assert (_cfunc3 '(1) as float = 4.);
+
+  let f = new_Foo '() in
+  assert (f -> newname () = C_void);
+  assert (f -> newname (1) = C_void);
+  (* TODO: There needs to be a more elegant way to pass NULL/nullptr. *)
+  let args = C_list [ C_int 2 ; C_ptr (0L, 0L) ] in
+  assert (f -> double_if_void_ptr_is_null (args) as int = 4);
+  assert (f -> double_if_void_ptr_is_null (3) as int = 6);
+  let args = C_list [ C_int 4 ; C_ptr (0L, 0L) ] in
+  assert (f -> double_if_handle_is_null (args) as int = 8);
+  assert (f -> double_if_handle_is_null (5) as int = 10);
+  let args = C_list [ C_int 6 ; C_ptr (0L, 0L) ] in
+  assert (f -> double_if_dbl_ptr_is_null (args) as int = 12);
+  assert (f -> double_if_dbl_ptr_is_null (7) as int = 14);
+
+  let k = new_Klass '(22) in
+  let k2 = _Klass_inc (C_list [ C_int 100 ; k ]) in
+  assert (k2 -> "[val]" () as int = 122);
+  let k2 = _Klass_inc '(100) in
+  assert (k2 -> "[val]" () as int = 99);
+  let k2 = _Klass_inc '() in
+  assert (k2 -> "[val]" () as int = 0);
+
+  assert (_seek '() = C_void);
+  assert (_seek (C_int64 10L) = C_void);
+
+  assert (_slightly_off_square '(10) as int = 102);
+  assert (_slightly_off_square '() as int = 291);
+
+  assert (_casts1 '() as char = '\x00');
+  assert (_casts2 '() as string = "Hello");
+  assert (_casts1 '("Ciao") as string = "Ciao");
+  assert (_chartest1 '() as char = 'x');
+  assert (_chartest2 '() as char = '\x00');
+  assert (_chartest3 '() as char = '\x01');
+  assert (_chartest4 '() as char = '\n');
+  assert (_chartest5 '() as char = 'B');
+  assert (_chartest6 '() as char = 'C');
+;;

Examples/test-suite/ocaml/exception_order_runme.ml

@@ -5,7 +5,7 @@ let a = new_A '()
 
 let check meth args expected =
   try
-    ignore ((invoke a) meth (C_list [ args ])); assert false
+    ignore ((invoke a) meth (args)); assert false
   with Failure msg -> assert (msg = expected)
 
 let _ =

Examples/test-suite/ocaml/global_ns_arg_runme.ml

@@ -2,4 +2,4 @@ open Swig
 open Global_ns_arg
 
 let _ = assert ((_foo '(1) as int) = 1)
-let _ = assert ((_bar_fn '(1) as int) = 1)
+let _ = assert ((_bar_fn '() as int) = 1)

Examples/test-suite/ocaml/throw_exception_runme.ml

@@ -5,7 +5,7 @@ let x = new_Foo '()
 
 let check meth args expected =
   try
-    let _ = ((invoke x) meth (C_list [ args ])) in assert false
+    let _ = ((invoke x) meth (args)) in assert false
   with Failure msg -> assert (msg = expected)
 
 let _ =

Examples/test-suite/ocaml/typemap_arrays_runme.ml

@@ -1,4 +1,4 @@
 open Swig
 open Typemap_arrays
 
-let _ = assert (_sumA '() as int = 60)
+let _ = assert (_sumA '(0) as int = 60)

Source/Modules/ocaml.cxx

@@ -553,7 +553,18 @@ public:
 
     numargs = emit_num_arguments(l);
     numreq = emit_num_required(l);
-
+    if (!isOverloaded) {
+      if (numargs > 0) {
+	if (numreq > 0) {
+	  Printf(f->code, "if (caml_list_length(args) < %d || caml_list_length(args) > %d) {\n", numreq, numargs);
+	} else {
+	  Printf(f->code, "if (caml_list_length(args) > %d) {\n", numargs);
+	}
+	Printf(f->code, "caml_invalid_argument(\"Incorrect number of arguments passed to '%s'\");\n}\n", iname);
+      } else {
+	Printf(f->code, "if (caml_list_length(args) > 0) caml_invalid_argument(\"'%s' takes no arguments\");\n", iname);
+      }
+    }
     Printf(f->code, "swig_result = Val_unit;\n");
 
     // Now write code to extract the parameters (this is super ugly)