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improvements to save point usage in Arena allocators

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Edward R. Gonzalez
2025-06-26 00:59:42 -04:00
parent 53e8266931
commit 8fe05e0fb8
1 changed files with 16 additions and 12 deletions
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28
C/watl.v0.msvc.c
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@@ -222,20 +222,24 @@ typedef def_enum(U64, AllocatorQueryFlags) {
// Ability to rewind to a save point (ex: arenas, stack), must also be able to save such a point
AllocatorQuery_Rewind = (1 << 6),
};
typedef def_struct(AllocatorProc_In) {
void* data;
SSIZE requested_size;
SSIZE alignment;
Slice_Byte old_allocation;
AllocatorOp op;
byte_pad(4);
};
typedef struct AllocatorProc_In AllocatorProc_In;
typedef struct AllocatorProc_Out AllocatorProc_Out;
typedef void fn(AllocatorProc) (AllocatorProc_In In, AllocatorProc_Out* Out);
typedef def_struct(AllocatorSP) {
AllocatorProc* type_sig;
SSIZE slot;
};
struct AllocatorProc_In {
void* data;
SSIZE requested_size;
SSIZE alignment;
union {
Slice_Byte old_allocation;
AllocatorSP save_point;
};
AllocatorOp op;
byte_pad(4);
};
struct AllocatorProc_Out {
union {
Slice_Byte allocation;
@@ -751,7 +755,7 @@ void mem_reset(AllocatorInfo ainfo) {
inline
void mem_rewind(AllocatorInfo ainfo, AllocatorSP save_point) {
assert(ainfo.proc != nullptr);
ainfo.proc((AllocatorProc_In){.data = ainfo.data, .op = AllocatorOp_Rewind, .old_allocation = {.ptr = cast(Byte*, & save_point)}}, &(AllocatorProc_Out){});
ainfo.proc((AllocatorProc_In){.data = ainfo.data, .op = AllocatorOp_Rewind, .save_point = save_point}, &(AllocatorProc_Out){});
}
inline
AllocatorSP mem_save_point(AllocatorInfo ainfo) {
@@ -922,7 +926,7 @@ void farena_allocator_proc(AllocatorProc_In in, AllocatorProc_Out* out)
break;
case AllocatorOp_Rewind:
farena_rewind(arena, * cast(AllocatorSP*, in.old_allocation.ptr));
farena_rewind(arena, in.save_point);
break;
case AllocatorOp_SavePoint:
out->save_point = farena_save(* arena);
@@ -1170,7 +1174,7 @@ void varena_allocator_proc(AllocatorProc_In in, AllocatorProc_Out* out)
break;
case AllocatorOp_Rewind:
vm->commit_used = cast(SSIZE, in.old_allocation.ptr);
vm->commit_used = in.save_point.slot;
break;
case AllocatorOp_SavePoint:
out->save_point = varena_save(vm);
@@ -1340,7 +1344,7 @@ void arena_allocator_proc(AllocatorProc_In in, AllocatorProc_Out* out)
break;
case AllocatorOp_Rewind:
arena_rewind(arena, * cast(AllocatorSP*, in.old_allocation.ptr));
arena_rewind(arena, in.save_point);
break;
case AllocatorOp_SavePoint: