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Temporary allocator for context

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This commit is contained in:
gingerBill
2018-08-29 19:55:55 +01:00
parent 28523f17e2
commit 001837e6bb
7 changed files with 145 additions and 14 deletions
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core/mem/mem.odin
+17 -6
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@@ -10,8 +10,9 @@ foreign _ {
swap :: proc[swap16, swap32, swap64];
set :: proc "contextless" (data: rawptr, value: i32, len: int) -> rawptr {
set :: proc "contextless" (data: rawptr, value: byte, len: int) -> rawptr {
if data == nil do return nil;
if len < 0 do return data;
foreign _ {
when size_of(rawptr) == 8 {
@(link_name="llvm.memset.p0i8.i64")
@@ -138,6 +139,16 @@ align_forward :: proc(ptr: rawptr, align: uintptr) -> rawptr {
return rawptr(p);
}
align_forward_uintptr :: proc(ptr, align: uintptr) -> uintptr {
assert(is_power_of_two(align));
a := uintptr(align);
p := uintptr(ptr);
modulo := p & (a-1);
if modulo != 0 do p += a - modulo;
return uintptr(p);
}
AllocationHeader :: struct {size: int};
@@ -181,7 +192,7 @@ Arena :: struct {
temp_count: int,
}
ArenaTempMemory :: struct {
Arena_Temp_Memory :: struct {
arena: ^Arena,
original_count: int,
}
@@ -249,7 +260,7 @@ arena_allocator_proc :: proc(allocator_data: rawptr, mode: Allocator_Mode,
case Free:
// NOTE(bill): Free all at once
// Use ArenaTempMemory if you want to free a block
// Use Arena_Temp_Memory if you want to free a block
case Free_All:
(^Raw_Slice)(&arena.memory).len = 0;
@@ -261,15 +272,15 @@ arena_allocator_proc :: proc(allocator_data: rawptr, mode: Allocator_Mode,
return nil;
}
begin_arena_temp_memory :: proc(a: ^Arena) -> ArenaTempMemory {
tmp: ArenaTempMemory;
begin_arena_temp_memory :: proc(a: ^Arena) -> Arena_Temp_Memory {
tmp: Arena_Temp_Memory;
tmp.arena = a;
tmp.original_count = len(a.memory);
a.temp_count += 1;
return tmp;
}
end_arena_temp_memory :: proc(using tmp: ArenaTempMemory) {
end_arena_temp_memory :: proc(using tmp: Arena_Temp_Memory) {
assert(len(arena.memory) >= original_count);
assert(arena.temp_count > 0);
(^Raw_Dynamic_Array)(&arena.memory).len = original_count;