What exactly is randomized with ASLR in MacOS X and iOS

Question

Does anybody have a link to a documentation what exactly is randomized in what cases for latest Mac OS (10.7) and iOS (6.0)?

I mean. I want to see a list (something like

Answer 1

No PIE:

Executable - Fixed

Data - Fixed

Heap - Randomized per execution

Stack - Fixed

Libraries - Randomized per device boot

Linker - Fixed

With PIE:

Executable - Randomized per execution

Data - Randomized per execution

Heap - Randomized per execution(more entropy)

Stack - Randomized per execution

Libraries - Randomized per device boot

Linker - Randomized per execution