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digitalmars.D.bugs - [Issue 8079] New: Memory corruption on stack-allocated temporary static arrays

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=8079

           Summary: Memory corruption on stack-allocated temporary static
                    arrays
           Product: D
           Version: D2
          Platform: x86_64
        OS/Version: Linux
            Status: NEW
          Severity: critical
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: hsteoh quickfur.ath.cx


--- Comment #0 from hsteoh quickfur.ath.cx 2012-05-10 12:00:55 PDT ---
Code:
        import std.stdio;
        struct S {
                short[4] x;
                this(short[4] args...) {
                        x[] = args[];
                }
                bool opEquals(in S s) const {
                        for (auto i=0; i < 4; i++) {
                                if (this.x[i] != s.x[i])
                                        return false;
                        }
                        return true;
                }
        }
        void main() {
                assert(S(1,2,3,4) == S(1,2,3,4));
        }

Output: with dmd -m64, the assertion fails. Inserting writeln's show that the
elements of s in opEquals() are garbage values. Trying to print out the entire
array of this or s causes a segfault.

On dmd -m32, there is no problem.

Not sure if this is related to bug 5570.

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next sibling parent d-bugmail puremagic.com writes:
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--- Comment #1 from hsteoh quickfur.ath.cx 2012-05-10 12:11:18 PDT ---
P.S. Changing the static array to int[4] for some reason makes the problem go
away. Don't know how this is relevant, but might be useful to track down the
bug in the compiler.

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--- Comment #2 from hsteoh quickfur.ath.cx 2012-05-22 11:13:49 PDT ---
Can no longer reproduce this bug in latest git dmd, may have been fixed?

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prev sibling parent d-bugmail puremagic.com writes:
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Damian Ziemba <nazriel6969 gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |nazriel6969 gmail.com
         Resolution|                            |FIXED


--- Comment #3 from Damian Ziemba <nazriel6969 gmail.com> 2012-09-05 02:05:26
PDT ---
Seems to work with DMD 2.060 (and trunk) both with m32 and m64

http://dpaste.dzfl.pl/c6857366

I think we can close this issue as for now although I am not sure what certain
Commit fixed it.

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