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ed
2025-02-05 18:13:22 -05:00
parent 648e15daa6
commit 9faca77c74
8 changed files with 349 additions and 248 deletions
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code/base/arena.c
+58 -52
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@@ -15,15 +15,14 @@ Arena*
arena_alloc_(ArenaParams* params)
{
void* base = alloc(params->backing, params->block_size);
// rjf: extract arena header & fill
Arena* arena = (Arena*) base;
arena->prev = nullptr;
arena->current = arena;
arena->backing = params->backing;
arena->pos = size_of(Arena);
arena->block_size = params->block_size;
arena->flags = params->flags;
asan_unpoison_memory_region(base, sizeof(Arena));
return arena;
}
@@ -33,59 +32,66 @@ arena_alloc_(ArenaParams* params)
internal void *
arena_push(Arena *arena, U64 size, U64 align)
{
Arena *current = arena->current;
U64 pos_pre = AlignPow2(current->pos, align);
U64 pos_pst = pos_pre + size;
SPTR header_size = size_of(Arena);
Arena *current = arena->current;
SPTR pos_pre = AlignPow2(current->pos, align);
SPTR pos_pst = pos_pre + size;
// rjf: chain, if needed
if(current->res < pos_pst && !(arena->flags & ArenaFlag_NoChain))
{
U64 res_size = current->res_size;
U64 cmt_size = current->cmt_size;
if(size + ARENA_HEADER_SIZE > res_size)
{
res_size = size + ARENA_HEADER_SIZE;
cmt_size = size + ARENA_HEADER_SIZE;
}
Arena *new_block = arena_alloc(.reserve_size = res_size,
.commit_size = cmt_size,
.flags = current->flags);
new_block->base_pos = current->base_pos + current->res;
SLLStackPush_N(arena->current, new_block, prev);
current = new_block;
pos_pre = AlignPow2(current->pos, align);
pos_pst = pos_pre + size;
}
// rjf: chain, if needed
if ( current->block_size < pos_pst && !(arena->flags & ArenaFlag_NoChain) )
{
SSIZE res_size = current->block_size;
if(size + > res_size)
{
res_size = size + ARENA_HEADER_SIZE;
}
Arena *new_block = arena_alloc(
.reserve_size = res_size,
.commit_size = cmt_size,
.flags = current->flags
);
new_block->base_pos = current->base_pos + current->res;
SLLStackPush_N(arena->current, new_block, prev);
current = new_block;
pos_pre = AlignPow2(current->pos, align);
pos_pst = pos_pre + size;
}
// rjf: commit new pages, if needed
if(current->cmt < pos_pst && !(current->flags & ArenaFlag_LargePages))
{
U64 cmt_pst_aligned = AlignPow2(pos_pst, current->cmt_size);
U64 cmt_pst_clamped = ClampTop(cmt_pst_aligned, current->res);
U64 cmt_size = cmt_pst_clamped - current->cmt;
os_commit((U8 *)current + current->cmt, cmt_size);
current->cmt = cmt_pst_clamped;
}
// rjf: commit new pages, if needed
if(current->cmt < pos_pst && !(current->flags & ArenaFlag_LargePages))
{
U64 cmt_pst_aligned = AlignPow2(pos_pst, current->cmt_size);
U64 cmt_pst_clamped = ClampTop(cmt_pst_aligned, current->res);
U64 cmt_size = cmt_pst_clamped - current->cmt;
os_commit((U8 *)current + current->cmt, cmt_size);
current->cmt = cmt_pst_clamped;
}
// rjf: push onto current block
void *result = 0;
if(current->cmt >= pos_pst)
{
result = (U8 *)current+pos_pre;
current->pos = pos_pst;
AsanUnpoisonMemoryRegion(result, size);
}
// rjf: panic on failure
#if OS_FEATURE_GRAPHICAL
if(Unlikely(result == 0))
{
os_graphical_message(1, str8_lit("Fatal Allocation Failure"), str8_lit("Unexpected memory allocation failure."));
os_abort(1);
}
#endif
return result;
// rjf: push onto current block
void *result = 0;
if(current->cmt >= pos_pst)
{
result = (U8 *)current+pos_pre;
current->pos = pos_pst;
AsanUnpoisonMemoryRegion(result, size);
}
// rjf: panic on failure
#if OS_FEATURE_GRAPHICAL
if(Unlikely(result == 0))
{
os_graphical_message(1, str8_lit("Fatal Allocation Failure"), str8_lit("Unexpected memory allocation failure."));
os_abort(1);
}
#endif
return result;
}
internal U64