[vala/0.50] codegen: "_first_array" parameter for params-array is variadic too

[Rico Tzschichholz <ricotz src gnome org>]

commit a2b2dfbaa08683a3ae7f6c50f453cdb80327bf1f
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Tue Mar 2 17:55:25 2021 +0100

    codegen: "_first_array" parameter for params-array is variadic too
    
    Not following this resulted in mismatching signature assumptions between
    caller and callee if the callable throws an error.

 codegen/valaccodemethodmodule.vala          |  2 +-
 tests/Makefile.am                           |  1 +
 tests/methods/params-array-with-throws.vala | 57 +++++++++++++++++++++++++++++
 3 files changed, 59 insertions(+), 1 deletion(-)
---
diff --git a/codegen/valaccodemethodmodule.vala b/codegen/valaccodemethodmodule.vala
index 979eead1a..2ec6b8899 100644
--- a/codegen/valaccodemethodmodule.vala
+++ b/codegen/valaccodemethodmodule.vala
@@ -917,7 +917,7 @@ public abstract class Vala.CCodeMethodModule : CCodeStructModule {
                                }
 
                                cparam = new CCodeParameter ("_first_%s".printf (get_ccode_name (param)), 
ctypename);
-                               cparam_map.set (get_param_pos (get_ccode_pos (param), false), cparam);
+                               cparam_map.set (get_param_pos (get_ccode_pos (param) - 0.1, true), cparam);
 
                                va_list_name = "_va_list_%s".printf (get_ccode_name (param));
                        }
diff --git a/tests/Makefile.am b/tests/Makefile.am
index cd125650b..043b2a825 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -222,6 +222,7 @@ TESTS = \
        methods/nowrapper-no-vfunc.test \
        methods/params-array.vala \
        methods/params-array-abstract.test \
+       methods/params-array-with-throws.vala \
        methods/print-attribute.vala \
        methods/print-attribute-invalid.test \
        methods/printf-invalid.test \
diff --git a/tests/methods/params-array-with-throws.vala b/tests/methods/params-array-with-throws.vala
new file mode 100644
index 000000000..9bffd6680
--- /dev/null
+++ b/tests/methods/params-array-with-throws.vala
@@ -0,0 +1,57 @@
+errordomain FooError {
+       BAD,
+       WORSE
+}
+
+void foo (params string[] array) throws FooError {
+       assert (array.length == 3);
+       assert (array[0] == "foo");
+       assert (array[1] == "bar");
+       assert (array[2] == "manam");
+}
+
+void bar (params string[] array) throws FooError {
+       throw new FooError.BAD ("bad");
+}
+
+class Foo {
+       public void foo (params string[] array) throws FooError {
+               assert (array.length == 3);
+               assert (array[0] == "foo");
+               assert (array[1] == "bar");
+               assert (array[2] == "manam");
+       }
+
+       public void bar (params string[] array) throws FooError {
+               throw new FooError.BAD ("bad");
+       }
+}
+
+void main () {
+       {
+               foo ("foo", "bar", "manam");
+       }
+       {
+               try {
+                       bar ("foo", "bar", "manam");
+                       assert_not_reached ();
+               } catch (FooError.BAD e) {
+               } catch {
+                       assert_not_reached ();
+               }
+       }
+       {
+               var foo = new Foo ();
+               foo.foo ("foo", "bar", "manam");
+       }
+       {
+               try {
+                       var foo = new Foo ();
+                       foo.bar ("foo", "bar", "manam");
+                       assert_not_reached ();
+               } catch (FooError.BAD e) {
+               } catch {
+                       assert_not_reached ();
+               }
+       }
+}