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Nils O. Selåsdal
2026-06-10 20:23:14 +02:00
parent fe3d316b67
commit 0fbe5e8255
3 changed files with 17 additions and 15 deletions
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src/mini_arena.h
+11 -9
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@@ -6,9 +6,9 @@
typedef struct MArena MArena;
struct MArena {
U8 *base; // start of buffer
U32 first_free; // next alloc point
U32 first_free;
U32 size;
S32 checkpoint_level; // level of marena_temp_begin nesting
S32 temp_level; // level of marena_temp_begin nesting
};
typedef struct MTemp MTemp;
@@ -18,7 +18,7 @@ struct MTemp {
};
#define MARENA_STATIC_INITIALIZER(data) MARENA_INITIALIZER((data), sizeof(data))
#define MARENA_INITIALIZER(data, size_) {.base = (data), .first_free = 0, .size = (U32)size_, .checkpoint_level = 0}
#define MARENA_INITIALIZER(data, size_) {.base = (data), .first_free = 0, .size = (U32)size_, .temp_level = 0}
#define MARENA_DEFINE(var_name, size, alignment_) \
struct { \
_Alignas(alignment_) U8 memory[size];\
@@ -41,7 +41,7 @@ static INLINE MTemp marena_temp_begin(MArena *arena)
checkpoint.arena = arena;
checkpoint.offset = arena->first_free;
arena->checkpoint_level++;
arena->temp_level++;
return checkpoint;
}
@@ -49,13 +49,15 @@ static INLINE MTemp marena_temp_begin(MArena *arena)
static INLINE void marena_temp_end(MTemp *state)
{
MArena *arena = state->arena;
Assert(arena->checkpoint_level > 0);
Assert(arena->temp_level > 0);
arena->first_free = state->offset;
arena->checkpoint_level--;
arena->temp_level--;
}
#define marena_push_type(allocator, type_) marenaalloc_aligned((allocator), sizeof(type_), _Alignof(type_))
#define marena_push_array(allocator, type_, nr_elements_) marenaalloc_aligned((allocator), (nr_elements_) * (U32)sizeof(type_), _Alignof(type_))
#define marena_push_type(allocator, type_)\
marenaalloc_aligned((allocator), sizeof(type_), _Alignof(type_))
#define marena_push_array(allocator, type_, nr_elements_)\
marenaalloc_aligned((allocator), (nr_elements_) * (U32)sizeof(type_), _Alignof(type_))
static INLINE void *marena_push(MArena *arena, U32 size)
@@ -74,7 +76,7 @@ static INLINE void *maren_push_aligned(MArena *arena, U32 size, U32 align)
Assert(IsPow2(align));
U32 aligned = AlignUp(arena->first_free, align);
if (aligned < arena->first_free) { // align wrapped
if (aligned < arena->first_free) { // aligned wrapped around
return NULL;
}