debuginfo: Added test case for structs with destructor.

src/test/debug-info/struct-with-destructor.rs

@@ -0,0 +1,77 @@
+// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// xfail-test
+
+// compile-flags:-Z extra-debug-info
+// debugger:break zzz
+// debugger:run
+// debugger:finish
+// debugger:print simple
+// check:$1 = {x = 10, y = 20}
+
+// debugger:print noDestructor
+// check:$2 = {a = {x = 10, y = 20}, guard = -1}
+
+// debugger:print withDestructor
+// check:$3 = {a = {x = 10, y = 20}, guard = -1}
+
+struct NoDestructor {
+    x : i32,
+    y : i64
+}
+
+struct WithDestructor {
+    x : i32,
+    y : i64
+}
+
+impl Drop for WithDestructor {
+    fn finalize(&self) {}
+}
+
+struct NoDestructorGuarded
+{
+    a: NoDestructor,
+    guard: i64
+}
+
+struct WithDestructorGuarded
+{
+    a: WithDestructor,
+    guard: i64
+}
+
+
+// The compiler adds a 'destructed' boolean field to structs implementing Drop. This field is used
+// at runtime to prevent finalize() to be executed more than once (see middle::trans::adt).
+// This field must be incorporated by the debug info generation. Otherwise the debugger assumes a
+// wrong size/layout for the struct.
+fn main() {
+
+    let simple = WithDestructor { x: 10, y: 20 };
+
+    let noDestructor = NoDestructorGuarded {
+        a: NoDestructor { x: 10, y: 20 },
+        guard: -1
+    };
+
+    // If the destructor flag field is not incorporated into the debug info for 'WithDestructor'
+    // then the debugger will have an invalid offset for the field 'guard' and thus should not be
+    // able to read its value correctly.
+    let withDestructor = WithDestructorGuarded {
+        a: WithDestructor { x: 10, y: 20 },
+        guard: -1
+    };
+
+    zzz();
+}
+
+fn zzz() {()}