[PATCH] Fix incorrect assertion when deallocating big block

[Christophe Lyon]

On Tue, 13 Nov 2018 at 23:58, Jonathan Wakely <jwakely@redhat.com> wrote:
>
> Since a big_block rounds up the size to a multiple of big_block::min it
> is wrong to assert that the supplied number of bytes equals the
> big_block's size(). Add big_block::alloc_size(size_t) to calculate the
> allocated size consistently, and add comments to the code.
>
>         * src/c++17/memory_resource.cc (big_block): Improve comments.
>         (big_block::all_ones): Remove.
>         (big_block::big_block(size_t, size_t)): Use alloc_size.
>         (big_block::size()): Add comment, replace all_ones with equivalent
>         expression.
>         (big_block::align()): Shift value of correct type.
>         (big_block::alloc_size(size_t)): New function to round up size.
>         (__pool_resource::allocate(size_t, size_t)): Add comment.
>         (__pool_resource::deallocate(void*, size_t, size_t)): Likewise. Fix
>         incorrect assertion by using big_block::alloc_size(size_t).
>         * testsuite/20_util/unsynchronized_pool_resource/allocate.cc: Add
>         more tests for unpooled allocations.
>

Hi Jonathan,

I've noticed that the updated test fails on arm*:
FAIL: 20_util/unsynchronized_pool_resource/allocate.cc execution test

the log says:
/libstdc++-v3/testsuite/20_util/unsynchronized_pool_resource/allocate.cc:232:
void test06(): Assertion 'false' failed.

The same happens on aarch64-elf with -mabi=ilp32

Christophe

> Tested x86_64-linux, committed to trunk.
>