[PATCH] D12970: SmallVector fix for use-after-dtor bug.

[David Blaikie via llvm-commits]

On Fri, Sep 18, 2015 at 3:13 PM, Evgeniy Stepanov via llvm-commits <
llvm-commits at lists.llvm.org> wrote:

> eugenis added a comment.
>
> The problem is this:
> SmallVectorTemplateCommon only has space for the first element of the
> vector; the rest of the space is provided by SmallVector and used by
> effectively overflowing the field SmallVectorTemplateCommon. Sanitizers are
> OK with it because the memory is, in fact, allocated.
>
> Use-after-destroy detector complains about ~SmallVectorTemplateCommon
> accessing memory that belongs to SmallVector (the destructor for that has
> already ran at the point) when calling destructors for individual vector
> elements in destroy_range.


Ah, once I put all the dtor execution order straight in my head, I see it.


>
>
> http://reviews.llvm.org/D12970
>
>
>
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