[Issue 1282] Very strange GC problem, memory corruption

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=1282





------- Comment #6 from deewiant at gmail.com  2007-06-21 14:45 -------
Pseudocode, closer to the original situation:

struct S { contains pointers and classes }
S* ps;
S[] ss;

void main() {
        ss ~= S();
        for (;;) {
                for (size_t i = ss.length; i-- > 0;) {
                        ps = &ss[i];

                        do stuff, use ps, mess with the heap
                        heap allocation, dynamic array usage aplenty

                        if (condition) {
                                delete ps;
                                ss = ss[0..i] ~ ss[i+1..$];
                                continue;
                        }
                }
        }
}

I don't know pretty much anything about the inner workings of the GC, but maybe
the above can clarify why something went wrong?

If not, feel free to take a detailed look at what happens when the delete in
the main loop is executed (in ccbi.d in the evil_bug.zip I uploaded). Maybe you
can find a deeper problem.


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