[Issue 9352] New: Memory corruption in delegate called by struct dtor

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9352

           Summary: Memory corruption in delegate called by struct dtor
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: hsteoh at quickfur.ath.cx


--- Comment #0 from hsteoh at quickfur.ath.cx 2013-01-18 12:07:19 PST ---
Code:

------------SNIP-----------
import std.stdio;

static ubyte canary[32] = [
        0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
        20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31
];

struct S {
        ubyte[32] t;
        void delegate()[] destructor;

        this(int dummy) {
                t[] = canary[];
                writefln("ctor: %s", t);

                destructor ~= {
                        writefln("deleg: %s", t);
                };
        }

        ~this() {
                writefln("dtor: %s", t);

                // we're just undoing everything the constructor did, in
                // reverse order, same criteria
                foreach_reverse(d; destructor)
                        d();
        }
}

auto abc(int dummy) {
        return S(0);
}

void main() {
        auto input = abc(0);
        writefln("main: %s", input.t);
}
------------SNIP-----------

Output:
------------SNIP-----------
ctor: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31]
main: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31]
dtor: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31]
deleg: [0, 0, 0, 0, 0, 0, 0, 0, 24, 25, 26, 27, 28, 29, 30, 31, 240, 239, 168,
189, 184, 127, 0, 0, 152, 34, 64, 0, 0, 0, 0, 0]
------------SNIP-----------

This code was minimized from Adam Ruppe's terminal.d. The function abc(int
dummy) is necessary; if S is constructed in main, the problem does not occur.

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