> Why can't they just let devs embed their own garbage collector? Isn't he role of an assembly language to let the developer do stuff at a low level? I believe

> Why can't they just let devs embed their own garbage collector? Isn't he role of an assembly language to let the developer do stuff at a low level? I believe the big obstacle is that the stack is managed by the VM and isn't accessible directly (at least, in the form of one continuous memory region per thread). A likely constraint that led to this was to allow interoperability with the JavaScript stack.