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digitalmars.D.bugs - [Issue 4524] New: Bus error with nested struct

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=4524

           Summary: Bus error with nested struct
           Product: D
           Version: unspecified
          Platform: Other
        OS/Version: Mac OS X
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: andrei metalanguage.com


--- Comment #0 from Andrei Alexandrescu <andrei metalanguage.com> 2010-07-27
21:48:58 PDT ---
The code below causes a bus error on OSX:

import std.stdio, std.range;

void main()
{
    struct BiRange
    {
        int[] payload;
         property bool empty() { return payload.empty; }
         property BiRange save() { return this; }
         property ref int front() { return payload[0]; }
         property ref int back() { return payload[$ - 1]; }
        void popFront() { return payload.popFront(); }
        // void popBack() { return payload.popBack(); }
    }
    auto r = BiRange([1, 2, 3, 10, 11, 4]);
}

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next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=4524


Lars T. Kyllingstad <bugzilla kyllingen.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bugzilla kyllingen.net
         OS/Version|Mac OS X                    |All


--- Comment #1 from Lars T. Kyllingstad <bugzilla kyllingen.net> 2010-07-29
13:51:59 PDT ---
It causes a segmentation fault on Linux too.  Here's a reduced test case
without any imports:


void g(int j) { }

void main()
{
    struct S
    {
        int i;
        void f() { g(i); }
    }
    auto s = S();
}

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Jul 29 2010
prev sibling next sibling parent d-bugmail puremagic.com writes:
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Don <clugdbug yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code
                 CC|                            |clugdbug yahoo.com.au
           Severity|normal                      |critical


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Sep 20 2010
prev sibling next sibling parent d-bugmail puremagic.com writes:
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Don <clugdbug yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Bus error with nested       |Regression(2.026) Bus error
                   |struct                      |with nested struct
           Severity|critical                    |regression


--- Comment #2 from Don <clugdbug yahoo.com.au> 2010-09-26 01:37:01 PDT ---
Turns out that this worked on 2.025 and earlier. It also works on D1.

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prev sibling next sibling parent d-bugmail puremagic.com writes:
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Don <clugdbug yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |patch


--- Comment #3 from Don <clugdbug yahoo.com.au> 2010-09-27 03:59:07 PDT ---
Caused by the fix to bug 2619. When setting the hidden pointer, the wrong
offset is used, which overwrites the return stack instead. Yikes.

e2ir.c, StructLiteralExp::toElem(), line 4849. Shouldn't be adjusting the
'this' pointer, because setEthis() does already adds ad->vthis->offset to it.
All tests in the test suite have v->offset == 0, so this wasn't noticed before.

------
    if (sd->isnested)
    {   // Initialize the hidden 'this' pointer
        assert(sd->fields.dim);
        Dsymbol *s = (Dsymbol *)sd->fields.data[sd->fields.dim - 1];
        ThisDeclaration *v = s->isThisDeclaration();
        assert(v);

        elem *e1;
        if (tybasic(stmp->Stype->Tty) == TYnptr)
        {   e1 = el_var(stmp);
            e1->EV.sp.Voffset = soffset;
        }
        else
        {   e1 = el_ptr(stmp);
            if (soffset)
                e1 = el_bin(OPadd, TYnptr, e1, el_long(TYsize_t, soffset));
        }
-        e1 = el_bin(OPadd, TYnptr, e1, el_long(TYsize_t, v->offset));
        e1 = setEthis(loc, irs, e1, sd);

        e = el_combine(e, e1);
    }

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prev sibling parent d-bugmail puremagic.com writes:
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Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |bugzilla digitalmars.com
         Resolution|                            |FIXED


--- Comment #4 from Walter Bright <bugzilla digitalmars.com> 2010-09-27
13:29:54 PDT ---
http://www.dsource.org/projects/dmd/changeset/692

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