mirror of
https://github.com/Ed94/Odin.git
synced 2026-08-06 23:58:50 +00:00
Reorganize package mem
This commit is contained in:
gingerBill
+4
-389
@@ -183,27 +183,13 @@ align_forward_uintptr :: proc(ptr, align: uintptr) -> uintptr {
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return uintptr(p);
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}
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Allocation_Header :: struct {size: int};
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allocation_header_fill :: proc(header: ^Allocation_Header, data: rawptr, size: int) {
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header.size = size;
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ptr := cast(^uint)(ptr_offset(header, 1));
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n := ptr_sub(cast(^uint)data, ptr);
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for i in 0..n-1 {
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ptr_offset(ptr, i)^ = ~uint(0);
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}
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}
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allocation_header :: proc(data: rawptr) -> ^Allocation_Header {
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if data == nil do return nil;
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p := cast(^uint)data;
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for ptr_offset(p, -1)^ == ~uint(0) do p = ptr_offset(p, -1);
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return (^Allocation_Header)(ptr_offset(p, -1));
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context_from_allocator :: proc(a: Allocator) -> type_of(context) {
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context.allocator = a;
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return context;
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}
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Fixed_Byte_Buffer :: distinct [dynamic]byte;
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make_fixed_byte_buffer :: proc(backing: []byte) -> Fixed_Byte_Buffer {
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@@ -218,110 +204,6 @@ make_fixed_byte_buffer :: proc(backing: []byte) -> Fixed_Byte_Buffer {
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// Custom allocators
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Arena :: struct {
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backing: Allocator,
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memory: Fixed_Byte_Buffer,
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temp_count: int,
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}
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Arena_Temp_Memory :: struct {
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arena: ^Arena,
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original_count: int,
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}
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init_arena_from_memory :: proc(using a: ^Arena, data: []byte) {
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backing = Allocator{};
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memory = make_fixed_byte_buffer(data);
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temp_count = 0;
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}
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init_arena_from_context :: proc(using a: ^Arena, size: int) {
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backing = context.allocator;
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memory = make_fixed_byte_buffer(make([]byte, size));
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temp_count = 0;
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}
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context_from_allocator :: proc(a: Allocator) -> type_of(context) {
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context.allocator = a;
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return context;
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}
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destroy_arena :: proc(using a: ^Arena) {
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if backing.procedure != nil {
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context.allocator = backing;
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if memory != nil {
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free(&memory[0]);
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}
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memory = nil;
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}
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}
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arena_allocator :: proc(arena: ^Arena) -> Allocator {
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return Allocator{
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procedure = arena_allocator_proc,
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data = arena,
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};
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}
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arena_allocator_proc :: proc(allocator_data: rawptr, mode: Allocator_Mode,
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size, alignment: int,
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old_memory: rawptr, old_size: int, flags: u64, location := #caller_location) -> rawptr {
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using Allocator_Mode;
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arena := cast(^Arena)allocator_data;
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switch mode {
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case Alloc:
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total_size := size + alignment;
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if len(arena.memory) + total_size > cap(arena.memory) {
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return nil;
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}
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#no_bounds_check end := &arena.memory[len(arena.memory)];
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ptr := align_forward(end, uintptr(alignment));
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(^Raw_Slice)(&arena.memory).len += total_size;
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return zero(ptr, size);
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case Free:
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// NOTE(bill): Free all at once
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// Use Arena_Temp_Memory if you want to free a block
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case Free_All:
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(^Raw_Slice)(&arena.memory).len = 0;
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case Resize:
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return default_resize_align(old_memory, old_size, size, alignment, arena_allocator(arena));
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}
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return nil;
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}
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begin_arena_temp_memory :: proc(a: ^Arena) -> Arena_Temp_Memory {
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tmp: Arena_Temp_Memory;
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tmp.arena = a;
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tmp.original_count = len(a.memory);
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a.temp_count += 1;
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return tmp;
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}
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end_arena_temp_memory :: proc(using tmp: Arena_Temp_Memory) {
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assert(len(arena.memory) >= original_count);
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assert(arena.temp_count > 0);
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(^Raw_Dynamic_Array)(&arena.memory).len = original_count;
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arena.temp_count -= 1;
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}
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align_formula :: proc(size, align: int) -> int {
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result := size + align-1;
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return result - result%align;
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@@ -350,270 +232,3 @@ calc_padding_with_header :: proc(ptr: uintptr, align: uintptr, header_size: int)
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}
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Stack_Allocation_Header :: struct {
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prev_offset: int,
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padding: int,
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}
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// Stack is a stack-like allocator which has a strict memory freeing order
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Stack :: struct {
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data: []byte,
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prev_offset: int,
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curr_offset: int,
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peak_used: int,
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}
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init_stack :: proc(s: ^Stack, data: []byte) {
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s.data = data;
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s.prev_offset = 0;
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s.curr_offset = 0;
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s.peak_used = 0;
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}
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stack_allocator :: proc(stack: ^Stack) -> Allocator {
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return Allocator{
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procedure = stack_allocator_proc,
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data = stack,
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};
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}
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stack_allocator_proc :: proc(allocator_data: rawptr, mode: Allocator_Mode,
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size, alignment: int,
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old_memory: rawptr, old_size: int, flags: u64, location := #caller_location) -> rawptr {
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using Allocator_Mode;
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s := cast(^Stack)allocator_data;
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if s.data == nil {
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return nil;
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}
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raw_alloc :: proc(s: ^Stack, size, alignment: int) -> rawptr {
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curr_addr := uintptr(&s.data[0]) + uintptr(s.curr_offset);
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padding := calc_padding_with_header(curr_addr, uintptr(alignment), size_of(Stack_Allocation_Header));
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if s.curr_offset + padding + size > len(s.data) {
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return nil;
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}
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s.prev_offset = s.curr_offset;
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s.curr_offset += padding;
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next_addr := curr_addr + uintptr(padding);
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header := (^Stack_Allocation_Header)(next_addr - size_of(Stack_Allocation_Header));
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header.padding = auto_cast padding;
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header.prev_offset = auto_cast s.prev_offset;
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s.curr_offset += size;
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s.peak_used = max(s.peak_used, s.curr_offset);
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return zero(rawptr(next_addr), size);
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}
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switch mode {
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case Alloc:
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return raw_alloc(s, size, alignment);
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case Free:
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if old_memory == nil {
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return nil;
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}
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start := uintptr(&s.data[0]);
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end := start + uintptr(len(s.data));
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curr_addr := uintptr(old_memory);
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if !(start <= curr_addr && curr_addr < end) {
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panic("Out of bounds memory address passed to stack allocator (free)");
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return nil;
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}
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if curr_addr >= start+uintptr(s.curr_offset) {
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// NOTE(bill): Allow double frees
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return nil;
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}
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header := (^Stack_Allocation_Header)(curr_addr - size_of(Stack_Allocation_Header));
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old_offset := int(curr_addr - uintptr(header.padding) - uintptr(&s.data[0]));
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if old_offset != int(header.prev_offset) {
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panic("Out of order stack allocator free");
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return nil;
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}
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s.curr_offset = int(old_offset);
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s.prev_offset = int(header.prev_offset);
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case Free_All:
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s.prev_offset = 0;
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s.curr_offset = 0;
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case Resize:
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if old_memory == nil {
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return raw_alloc(s, size, alignment);
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}
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if size == 0 {
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return nil;
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}
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start := uintptr(&s.data[0]);
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end := start + uintptr(len(s.data));
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curr_addr := uintptr(old_memory);
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if !(start <= curr_addr && curr_addr < end) {
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panic("Out of bounds memory address passed to stack allocator (resize)");
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return nil;
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}
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if curr_addr >= start+uintptr(s.curr_offset) {
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// NOTE(bill): Allow double frees
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return nil;
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}
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if old_size == size {
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return old_memory;
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}
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header := (^Stack_Allocation_Header)(curr_addr - size_of(Stack_Allocation_Header));
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old_offset := int(curr_addr - uintptr(header.padding) - uintptr(&s.data[0]));
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if old_offset != int(header.prev_offset) {
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ptr := raw_alloc(s, size, alignment);
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copy(ptr, old_memory, min(old_size, size));
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return ptr;
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}
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old_memory_size := uintptr(s.curr_offset) - (curr_addr - start);
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assert(old_memory_size == uintptr(old_size));
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diff := size - old_size;
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s.curr_offset += diff; // works for smaller sizes too
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if diff > 0 {
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zero(rawptr(curr_addr + uintptr(diff)), diff);
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}
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return old_memory;
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}
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return nil;
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}
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Small_Stack_Allocation_Header :: struct {
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padding: u8,
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}
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// Small_Stack is a stack-like allocator which uses the smallest possible header but at the cost of non-strict memory freeing order
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Small_Stack :: struct {
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data: []byte,
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offset: int,
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peak_used: int,
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}
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init_small_stack :: proc(s: ^Small_Stack, data: []byte) {
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s.data = data;
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s.offset = 0;
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s.peak_used = 0;
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}
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small_stack_allocator :: proc(stack: ^Small_Stack) -> Allocator {
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return Allocator{
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procedure = small_stack_allocator_proc,
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data = stack,
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};
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}
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small_stack_allocator_proc :: proc(allocator_data: rawptr, mode: Allocator_Mode,
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size, alignment: int,
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old_memory: rawptr, old_size: int, flags: u64, location := #caller_location) -> rawptr {
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using Allocator_Mode;
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s := cast(^Small_Stack)allocator_data;
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if s.data == nil {
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return nil;
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}
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raw_alloc :: proc(s: ^Small_Stack, size, alignment: int) -> rawptr {
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curr_addr := uintptr(&s.data[0]) + uintptr(s.offset);
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padding := calc_padding_with_header(curr_addr, uintptr(alignment), size_of(Small_Stack_Allocation_Header));
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if s.offset + padding + size > len(s.data) {
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return nil;
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}
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s.offset += padding;
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next_addr := curr_addr + uintptr(padding);
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header := (^Small_Stack_Allocation_Header)(next_addr - size_of(Small_Stack_Allocation_Header));
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header.padding = auto_cast padding;
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s.offset += size;
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s.peak_used = max(s.peak_used, s.offset);
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return zero(rawptr(next_addr), size);
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}
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switch mode {
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case Alloc:
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return raw_alloc(s, size, alignment);
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case Free:
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if old_memory == nil {
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return nil;
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}
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start := uintptr(&s.data[0]);
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end := start + uintptr(len(s.data));
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curr_addr := uintptr(old_memory);
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if !(start <= curr_addr && curr_addr < end) {
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panic("Out of bounds memory address passed to stack allocator (free)");
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return nil;
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}
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if curr_addr >= start+uintptr(s.offset) {
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// NOTE(bill): Allow double frees
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return nil;
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}
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header := (^Small_Stack_Allocation_Header)(curr_addr - size_of(Small_Stack_Allocation_Header));
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old_offset := int(curr_addr - uintptr(header.padding) - uintptr(&s.data[0]));
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s.offset = int(old_offset);
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case Free_All:
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s.offset = 0;
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case Resize:
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if old_memory == nil {
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return raw_alloc(s, size, alignment);
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}
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if size == 0 {
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return nil;
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}
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start := uintptr(&s.data[0]);
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end := start + uintptr(len(s.data));
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curr_addr := uintptr(old_memory);
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if !(start <= curr_addr && curr_addr < end) {
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panic("Out of bounds memory address passed to stack allocator (resize)");
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return nil;
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}
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if curr_addr >= start+uintptr(s.offset) {
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// NOTE(bill): Treat as a double free
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return nil;
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}
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if old_size == size {
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return old_memory;
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}
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ptr := raw_alloc(s, size, alignment);
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copy(ptr, old_memory, min(old_size, size));
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return ptr;
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}
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return nil;
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}
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