From c7404a3ff89c738c002ec63448a58d56330dfcc3 Mon Sep 17 00:00:00 2001 From: Christian Walther Date: Sun, 11 Oct 2020 14:59:33 +0200 Subject: Add movable allocation system. This allows calls to `allocate_memory()` while the VM is running, it will then allocate from the GC heap (unless there is a suitable hole among the supervisor allocations), and when the VM exits and the GC heap is freed, the allocation will be moved to the bottom of the former GC heap and transformed into a proper supervisor allocation. Existing movable allocations will also be moved to defragment the supervisor heap and ensure that the next VM run gets as much memory as possible for the GC heap. By itself this breaks terminalio because it violates the assumption that supervisor_display_move_memory() still has access to an undisturbed heap to copy the tilegrid from. It will work in many cases, but if you're unlucky you will get garbled terminal contents after exiting from the vm run that created the display. This will be fixed in the following commit, which is separate to simplify review. --- supervisor/shared/stack.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'supervisor/shared/stack.h') diff --git a/supervisor/shared/stack.h b/supervisor/shared/stack.h index 7096f0b3e..1c75de5f7 100755 --- a/supervisor/shared/stack.h +++ b/supervisor/shared/stack.h @@ -31,10 +31,12 @@ #include "supervisor/memory.h" -extern supervisor_allocation* stack_alloc; - void stack_init(void); void stack_resize(void); +// Actual stack location and size, may be larger than requested. +uint32_t* stack_get_bottom(void); +size_t stack_get_length(void); +// Next/current requested stack size. void set_next_stack_size(uint32_t size); uint32_t get_current_stack_size(void); bool stack_ok(void); -- cgit v1.2.3