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internal arena *
ArenaAlloc_(arena_alloc_params Params)
{
arena *Arena = 0;
u64 Size = Params.DefaultSize;
if(Params.Size)
{
Size = Params.Size;
}
void *Base = OS_AllocateAtOffset(Size, Params.Offset);
AsanPoisonMemoryRegion(Base, Size);
u64 HeaderSize = sizeof(arena);
AsanUnpoisonMemoryRegion(Base, HeaderSize);
Arena = (arena *)Base;
Arena->Base = Base;
Arena->Pos = HeaderSize;
Arena->Size = Size;
return Arena;
}
internal arena *
PushArena(arena *Arena, u64 Size, b32 Zero)
{
arena *Result = 0;
Result = PushStruct(Arena, arena);
Result->Size = Size;
Result->Base = PushArray(Arena, u8, Result->Size);
if(Zero) Result->Pos = 0;
return Result;
}
internal void *
ArenaPush(arena *Arena, u64 Size, u64 Alignment, b32 Zero)
{
u64 AlignedPos = AlignPow2(Arena->Pos, Alignment);
u64 NewPos = AlignedPos + Size;
Assert(NewPos <= Arena->Size);
void *Result = (u8 *)Arena->Base + AlignedPos;
AsanUnpoisonMemoryRegion(Result, Size);
if(Zero)
{
MemorySet(Result, 0, Size);
}
Arena->Pos = NewPos;
return Result;
}
internal u64
BeginScratch(arena *Arena)
{
u64 Result = Arena->Pos;
return Result;
}
internal void
EndScratch(arena *Arena, u64 BackPos)
{
Arena->Pos = BackPos;
AsanPoisonMemoryRegion((u8 *)Arena->Base + Arena->Pos,
Arena->Size - Arena->Pos);
}
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