| Obj(3o) | OCamldoc | Obj(3o) |
Obj - Operations on internal representations of values.
Module Obj
Module Obj
: sig end
Operations on internal representations of values.
Not for the casual user.
type t
val repr : 'a -> t
val obj : t -> 'a
val magic : 'a -> 'b
val is_block : t -> bool
val is_int : t -> bool
val tag : t -> int
val size : t -> int
val reachable_words : t -> int
Computes the total size (in words, including the headers) of all heap blocks accessible from the argument. Statically allocated blocks are excluded.
@Since 4.04
val field : t -> int -> t
val set_field : t -> int -> t -> unit
When using flambda:
set_field MUST NOT be called on immutable blocks. (Blocks allocated in C stubs, or with new_block below, are always considered mutable.)
The same goes for set_double_field and set_tag . However, for set_tag , in the case of immutable blocks where the middle-end optimizers never see code that discriminates on their tag (for example records), the operation should be safe. Such uses are nonetheless discouraged.
For experts only: set_field et al can be made safe by first wrapping the block in Sys.opaque_identity , so any information about its contents will not be propagated.
val set_tag : t -> int -> unit
val double_field : t -> int -> float
val set_double_field : t -> int -> float -> unit
val new_block : int -> int -> t
val dup : t -> t
val truncate : t -> int -> unit
val add_offset : t -> Int32.t -> t
val first_non_constant_constructor_tag : int
val last_non_constant_constructor_tag : int
val lazy_tag : int
val closure_tag : int
val object_tag : int
val infix_tag : int
val forward_tag : int
val no_scan_tag : int
val abstract_tag : int
val string_tag : int
val double_tag : int
val double_array_tag : int
val custom_tag : int
val final_tag : int
val int_tag : int
val out_of_heap_tag : int
val unaligned_tag : int
val extension_constructor : 'a -> extension_constructor
val extension_name : extension_constructor -> string
val extension_id : extension_constructor -> int
=== The following two functions are deprecated. Use module Marshal instead. ===
val marshal : t -> bytes
val unmarshal : bytes -> int -> t * int
module Ephemeron : sig end
| source: | 2019-01-25 |