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Arena *alloc_arena(U64 cap)
{
Arena *a;
/* TODO(pryazha): Use OS specific memory allocator
* (like VirtualAlloc on Windows or mmap on Linux)
*/
a = malloc(sizeof(Arena));
ASSERT(a);
if (!cap)
cap = PRB_DEFAULT_ALLOC_SIZE;
a->mem = malloc(cap);
ASSERT(a->mem);
a->cap = cap;
a->used = 0;
return a;
}
void release_arena(Arena *a)
{
free(a->mem);
MEM0STRUCT(a);
free(a);
}
void *push_arena(Arena *a, U64 size)
{
ASSERT(a);
ASSERT(a->used+size <= a->cap);
void *r;
r = a->mem+a->used;
a->used += size;
return r;
}
void pop_arena(Arena *a, U64 size)
{
ASSERT(a);
U64 clamped;
clamped = CLAMPTOP(size, a->used);
a->used = a->used-clamped;
}
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