514045 - Dynamic strings should probably use unmanaged gc memory

Status: VERIFIED WONTFIX

(Tamarin Graveyard :: Virtual Machine, defect, P4)

Description

[Steven Johnson]

They currently use managed memory but the lifetime is controlled.

Before making this change, memory and speed impact must be measured.

Also, the "mmfx" api will need to have an equivalent to GC::Size(), to recover the actual memory allocated (as opposed to requested).

Comment 1

[Edwin Smith]

size_t mmfx_size(ptr, requestedSize)  was the api i thought of when this topic came up.  passing in requestedSize lets this be a no-op when mmfx_new/delete map to the standard impls.

Comment 2

[Lars T Hansen]

Another issue is that if we allocate the memory outside the GC heap then GC accounting will be off, this will add to the cost as we can't allow that.  So it's probably a wash - string data are pointerfree and don't stress the GC much.

Comment 3

[Trevor Baker]

bulk verifying resolved !fixed issues