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Add SCOPED_TEMPORARY_BLOCK for temporary allocations within a block

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This commit is contained in:
gingerBill
2020-11-15 18:45:40 +00:00
parent 30d922b059
commit 17ec3e72a6
12 changed files with 159 additions and 118 deletions
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35
src/common.cpp
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@@ -451,7 +451,6 @@ void arena_free_all(Arena *arena) {
GB_ALLOCATOR_PROC(arena_allocator_proc);
gbAllocator arena_allocator(Arena *arena) {
@@ -492,6 +491,38 @@ GB_ALLOCATOR_PROC(arena_allocator_proc) {
return ptr;
}
struct SCOPED_TEMP_ARENA_MEMORY {
Arena *arena;
u8 * ptr;
u8 * end;
u8 * prev;
isize total_used;
isize block_count;
SCOPED_TEMP_ARENA_MEMORY(Arena *the_arena) {
GB_ASSERT(!the_arena->use_mutex);
arena = the_arena;
ptr = arena->ptr;
end = arena->end;
prev = arena->prev;
total_used = arena->total_used;
block_count = arena->blocks.count;
}
~SCOPED_TEMP_ARENA_MEMORY() {
if (arena->blocks.count != block_count) {
for (isize i = block_count; i < arena->blocks.count; i++) {
gb_free(arena->backing, arena->blocks[i]);
}
arena->blocks.count = block_count;
}
arena->ptr = ptr;
arena->end = end;
arena->prev = prev;
arena->total_used = total_used;
}
};
gb_global Arena permanent_arena = {};
@@ -504,6 +535,8 @@ gbAllocator temporary_allocator() {
return arena_allocator(&temporary_arena);
}
#define SCOPED_TEMPORARY_BLOCK() auto GB_DEFER_3(_SCOPED_TEMPORARY_BLOCK_) = SCOPED_TEMP_ARENA_MEMORY(&temporary_arena)