[vala/0.50] codegen: Don't free temp-var for element-access to array with boxed structs

[Rico Tzschichholz <ricotz src gnome org>]

commit 21fbdb95aecf9ea723a48d47c3a8369cfbb94bf4
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sun Apr 11 18:05:08 2021 +0200

    codegen: Don't free temp-var for element-access to array with boxed structs
    
    Regression of 63551acaf0d83fac8b50904c2759c1098fbfaa71
    
    Fixes https://gitlab.gnome.org/GNOME/vala/issues/1174

 codegen/valaccodebasemodule.vala                   |   2 +-
 tests/Makefile.am                                  |   2 +
 tests/arrays/cast-struct-boxed-element-access.vala | 124 +++++++++++++++++++++
 tests/structs/cast-struct-boxed.vala               |  56 ++++++++++
 4 files changed, 183 insertions(+), 1 deletion(-)
---
diff --git a/codegen/valaccodebasemodule.vala b/codegen/valaccodebasemodule.vala
index c9874ee7d..7466d5cec 100644
--- a/codegen/valaccodebasemodule.vala
+++ b/codegen/valaccodebasemodule.vala
@@ -5423,7 +5423,7 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
                        while (inner_expr is CastExpression) {
                                inner_expr = ((CastExpression) inner_expr).inner;
                        }
-                       if (!(inner_expr.symbol_reference is Variable)) {
+                       if (!(inner_expr.symbol_reference is Variable || inner_expr is ElementAccess)) {
                                // heap allocated struct leaked, destroy it
                                var value = new GLibValue (new PointerType (new VoidType ()), innercexpr);
                                temp_ref_values.insert (0, value);
diff --git a/tests/Makefile.am b/tests/Makefile.am
index f0823d83e..03b221b9c 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -99,6 +99,7 @@ TESTS = \
        constants/strings.vala \
        namespace/unique.vala \
        arrays/cast-silent-invalid.test \
+       arrays/cast-struct-boxed-element-access.vala \
        arrays/class-field-initializer.vala \
        arrays/class-field-length-cname.vala \
        arrays/constant-element-access.vala \
@@ -323,6 +324,7 @@ TESTS = \
        enums/bug673879.vala \
        enums/bug763831.vala \
        enums/bug780050.vala \
+       structs/cast-struct-boxed.vala \
        structs/struct_only.vala \
        structs/struct-base-types.vala \
        structs/struct-boxed-cast.vala \
diff --git a/tests/arrays/cast-struct-boxed-element-access.vala 
b/tests/arrays/cast-struct-boxed-element-access.vala
new file mode 100644
index 000000000..fc2b77b9b
--- /dev/null
+++ b/tests/arrays/cast-struct-boxed-element-access.vala
@@ -0,0 +1,124 @@
+struct Foo {
+       public int i;
+}
+
+Foo?[] foo_array;
+
+Foo?[] foo_array_owned () {
+       return new Foo?[] { { 23 },  { 42 },  { 4711 } };
+}
+
+unowned Foo?[] foo_array_unowned () {
+       foo_array = new Foo?[] { { 23 },  { 42 },  { 4711 } };
+       return foo_array;
+}
+
+void test_without_destroy () {
+       {
+               var foo = new Foo?[] { { 23 },  { 42 },  { 4711 } };
+               {
+                       Foo f = foo[0];
+                       assert (f.i == 23);
+                       assert (foo[0].i == 23);
+               }
+               {
+                       Foo f = (Foo) foo[1];
+                       assert (f.i == 42);
+                       assert (foo[1].i == 42);
+               }
+               {
+                       Foo f = (!) foo[2];
+                       assert (f.i == 4711);
+                       assert (foo[2].i == 4711);
+               }
+       }
+       {
+               Foo f = foo_array_owned ()[0];
+               assert (f.i == 23);
+       }
+       {
+               Foo f = (Foo) foo_array_owned ()[1];
+               assert (f.i == 42);
+       }
+       {
+               Foo f = (!) foo_array_owned ()[2];
+               assert (f.i == 4711);
+       }
+       {
+               Foo f = foo_array_unowned ()[0];
+               assert (f.i == 23);
+       }
+       {
+               Foo f = (Foo) foo_array_unowned ()[1];
+               assert (f.i == 42);
+       }
+       {
+               Foo f = (!) foo_array_unowned ()[2];
+               assert (f.i == 4711);
+       }
+}
+
+struct Bar {
+       public string s;
+}
+
+Bar?[] bar_array;
+
+Bar?[] bar_array_owned () {
+       return new Bar?[] { { "foo" },  { "bar" },  { "manam" } };
+}
+
+unowned Bar?[] bar_array_unowned () {
+       bar_array = new Bar?[] { { "foo" },  { "bar" },  { "manam" } };
+       return bar_array;
+}
+
+void test_with_destroy () {
+       {
+               var bar = new Bar?[] { { "foo" },  { "bar" },  { "manam" } };
+               {
+                       Bar b = bar[0];
+                       assert (b.s == "foo");
+                       assert (bar[0].s == "foo");
+               }
+               {
+                       Bar b = (Bar) bar[1];
+                       assert (b.s == "bar");
+                       assert (bar[1].s == "bar");
+               }
+               {
+                       Bar b = (!) bar[2];
+                       assert (b.s == "manam");
+                       assert (bar[2].s == "manam");
+               }
+       }
+       {
+               Bar b = bar_array_owned ()[0];
+               assert (b.s == "foo");
+       }
+       {
+               Bar b = (Bar) bar_array_owned ()[1];
+               assert (b.s == "bar");
+       }
+       {
+               Bar b = (!) bar_array_owned ()[2];
+               assert (b.s == "manam");
+       }
+       {
+               Bar b = bar_array_unowned ()[0];
+               assert (b.s == "foo");
+       }
+       {
+               Bar b = (Bar) bar_array_unowned ()[1];
+               assert (b.s == "bar");
+       }
+       {
+               Bar b = (!) bar_array_unowned ()[2];
+               assert (b.s == "manam");
+       }
+}
+
+void main () {
+       test_without_destroy ();
+       test_with_destroy ();
+}
diff --git a/tests/structs/cast-struct-boxed.vala b/tests/structs/cast-struct-boxed.vala
new file mode 100644
index 000000000..97ccd1d7d
--- /dev/null
+++ b/tests/structs/cast-struct-boxed.vala
@@ -0,0 +1,56 @@
+struct Foo {
+       public int i;
+}
+
+Foo? foo;
+
+Foo? foo_heap_owned () {
+       foo = { 23 };
+       return foo;
+}
+
+void test_without_destroy () {
+       {
+               Foo f = foo_heap_owned ();
+               assert (f.i == 23);
+       }
+       {
+               Foo f = (Foo) foo_heap_owned ();
+               assert (f.i == 23);
+       }
+       {
+               Foo f = (!) foo_heap_owned ();
+               assert (f.i == 23);
+       }
+}
+
+struct Bar {
+       public string s;
+}
+
+Bar? bar;
+
+Bar? bar_heap_owned () {
+       bar = { "bar" };
+       return bar;
+}
+
+void test_with_destroy () {
+       {
+               Bar b = bar_heap_owned ();
+               assert (b.s == "bar");
+       }
+       {
+               Bar b = (Bar) bar_heap_owned ();
+               assert (b.s == "bar");
+       }
+       {
+               Bar b = (!) bar_heap_owned ();
+               assert (b.s == "bar");
+       }
+}
+
+void main () {
+       test_without_destroy ();
+       test_with_destroy ();
+}