mem_allocator_t Struct Reference

Manages dynamic memory allocation. More...

Collaboration diagram for mem_allocator_t:

Public Attributes
uint8_t *	heap_start
uint8_t *	heap_end
size_t	metadata_size
uintptr_t *	stack_top
uintptr_t *	stack_bottom
size_t	num_size_classes
size_t	num_arenas
block_header_t *	last_allocated
block_header_t **	free_lists
mem_arena_t *	arenas
mmap_t *	mmap_list
uint8_t *	last_brk_start
uint8_t *	last_brk_end
gc_thread_t	gc_thread

Detailed Description

Manages dynamic memory allocation.

This structure manages the heap, including free lists for memory blocks, garbage collection, and allocation strategies.

Fields:

• heap_start – Base of the user heap region
• heap_end – Current end of the heap
• metadata_size – Bytes reserved for bins and arenas
• stack_top – Upper bound of application stack
• stack_bottom – Lower bound of application stack
• last_allocated – Last block returned (NEXT_FIT)
• num_size_classes – Total size classes available
• num_arenas – Number of arena partitions
• arenas – Array of arena metadata
• mmap_list – Linked list of mmap’d regions
• free_lists – Segregated free lists by size class
• last_brk_start – Start address of the last sbrk(+) lease
• last_brk_end – End (exclusive) of the last sbrk(+) lease
• gc_thread – Garbage collector controller

Member Data Documentation

arenas

mem_arena_t* mem_allocator_t::arenas

Array of arena metadata

free_lists

block_header_t** mem_allocator_t::free_lists

Segregated free lists by size class

gc_thread

gc_thread_t mem_allocator_t::gc_thread

Garbage collector controller

heap_end

uint8_t* mem_allocator_t::heap_end

Current end of the heap

heap_start

uint8_t* mem_allocator_t::heap_start

Base of the user heap region

last_allocated

block_header_t* mem_allocator_t::last_allocated

Last block returned (NEXT_FIT)

last_brk_end

uint8_t* mem_allocator_t::last_brk_end

End (exclusive) of the last sbrk(+) lease

last_brk_start

uint8_t* mem_allocator_t::last_brk_start

Start address of the last sbrk(+) lease

metadata_size

size_t mem_allocator_t::metadata_size

Bytes reserved for bins and arenas

mmap_list

mmap_t* mem_allocator_t::mmap_list

Linked list of mmap’d regions

num_arenas

size_t mem_allocator_t::num_arenas

Number of arena partitions

num_size_classes

size_t mem_allocator_t::num_size_classes

Total size classes available

stack_bottom

uintptr_t* mem_allocator_t::stack_bottom

Lower bound of application stack

stack_top

uintptr_t* mem_allocator_t::stack_top

Upper bound of application stack

---

The documentation for this struct was generated from the following file:

• src/libmemalloc.c