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package runtime
nil_allocator_proc :: proc(allocator_data: rawptr, mode: Allocator_Mode,
size, alignment: int,
old_memory: rawptr, old_size: int, loc := #caller_location) -> ([]byte, Allocator_Error) {
switch mode {
case .Alloc, .Alloc_Non_Zeroed:
return nil, .Out_Of_Memory
case .Free:
return nil, .None
case .Free_All:
return nil, .Mode_Not_Implemented
case .Resize, .Resize_Non_Zeroed:
if size == 0 {
return nil, .None
}
return nil, .Out_Of_Memory
case .Query_Features:
return nil, .Mode_Not_Implemented
case .Query_Info:
return nil, .Mode_Not_Implemented
}
return nil, .None
}
// nil_allocator returns an allocator which will return `nil` for any result.
// * `.Alloc`, `.Alloc_Non_Zero`, `.Resize`, `.Resize_Non_Zeroed` will return `nil, .Out_Of_Memory`
// * `.Free` will return `nil, .None`
// * `.Free_All` will return `nil, .Mode_Not_Implemented`
// * `.Query_Features`, `.Query_Info` will return `nil, .Mode_Not_Implemented`
//
// This is extremely useful for creating a dynamic array from a buffer which does not nothing
// on a resize/reserve beyond the originally allocated memory.
@(require_results)
nil_allocator :: proc "contextless" () -> Allocator {
return Allocator{
procedure = nil_allocator_proc,
data = nil,
}
}
panic_allocator_proc :: proc(allocator_data: rawptr, mode: Allocator_Mode,
size, alignment: int,
old_memory: rawptr, old_size: int, loc := #caller_location) -> ([]byte, Allocator_Error) {
switch mode {
case .Alloc:
if size > 0 {
panic("panic allocator, .Alloc called", loc=loc)
}
case .Alloc_Non_Zeroed:
if size > 0 {
panic("panic allocator, .Alloc_Non_Zeroed called", loc=loc)
}
case .Resize:
if size > 0 {
panic("panic allocator, .Resize called", loc=loc)
}
case .Resize_Non_Zeroed:
if size > 0 {
panic("panic allocator, .Alloc_Non_Zeroed called", loc=loc)
}
case .Free:
if old_memory != nil {
panic("panic allocator, .Free called", loc=loc)
}
case .Free_All:
panic("panic allocator, .Free_All called", loc=loc)
case .Query_Features:
set := (^Allocator_Mode_Set)(old_memory)
if set != nil {
set^ = {.Query_Features}
}
return nil, nil
case .Query_Info:
panic("panic allocator, .Query_Info called", loc=loc)
}
return nil, nil
}
// panic_allocator returns an allocator which will panic for any non-zero-sized allocation or `query_info`
//
// This is extremely useful for to check when something does a memory operation when it should not, and thus panic.
@(require_results)
panic_allocator :: proc() -> Allocator {
return Allocator{
procedure = panic_allocator_proc,
data = nil,
}
}
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