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From: "ibuclaw at gdcproject dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug d/113758] New: d: Callee destructor call invalidates the live
 object, not the temporary
Date: Sun, 04 Feb 2024 20:53:56 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: d
X-Bugzilla-Version: 11.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: ibuclaw at gdcproject dot org
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113758

            Bug ID: 113758
           Summary: d: Callee destructor call invalidates the live object,
                    not the temporary
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: d
          Assignee: ibuclaw at gdcproject dot org
          Reporter: ibuclaw at gdcproject dot org
  Target Milestone: ---

D ABI does callee destruction of arguments, which depends on the argument
already being copied to a temporary before passing by ref.

At some point, the front-end stopped explicitly generating this temporary, =
so
now the code generator must take care of it.
---
struct Sdtor
{
    int field;
    ~this() { field =3D 0; }
}

void main()
{
    auto var =3D Sdtor(1);
    callee(var);
    assert(var.field =3D=3D 1); // fails.
}

void callee(Sdtor param) { }=