Updates:
Status: Invalid
Comment #1 on issue 395 by [email protected]: pointer not owned error
when calling malloc_usable_size() on array of structs with destructors
https://code.google.com/p/address-sanitizer/issues/detail?id=395
I don't think we can do anything here.
new[] for non-trivially-destructible types doesn't return you the pointer
to the allocated block of memory. It returns you a pointer *inside* the
block of allocated memory (which is what ASan report tells you), as the
beginning of allocated block contains an array cookie. I'm pretty sure
malloc_usable_size() is not guaranteed to
work in this case. It actually doesn't work without ASan. If I add
printf("%zu\n", malloc_usable_size(foo));
to your example I observe:
$ ./bin/clang++ tmp/test.cc ; ./a.out
18446744073709551608
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