DR containers memory limitation

[Reza Ghanbari]

Hello,
I was wondering if there is a way to use drvector_t and hashtable_t in such a way that they could acquire larger memory chunks than 2GB? or is there any equivalent container that could be used for that purpose?
They both use dr_global_alloc which allocates from reachable memory, limiting the size to 2GB.

[Enrico Deiana]

As you noted, drcontainers are implemented using dr_global_alloc() to simplify reachability in a 64-bit address space.

Depending on your needs (e.g., will this heap memory NOT be referenced in the code cache?), you can implement your own containers using dr_custom_alloc() (see: https://dynamorio.org/dr__tools_8h.html#a527e0746207909580b705f1743537921) without the DR_ALLOC_CACHE_REACHABLE flag.

If you need reachability of this memory from the code cache, see: https://dynamorio.org/page_deploy.html#op_reachable_heap and the discussion at https://dynamorio.org/using.html#sec_64bit_reach.

- Enrico

[Derek Bruening]

If you would like to extend the provided containers to optionally support using non-reachable heap we would be happy to look at an interface proposal and pull request(s).

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