Frama-C API - Bit_utils
Some bit manipulations.
val sizeofchar : unit -> Integer.t
sizeof(char)
in bits
val sizeof : Cil_types.typ -> Int_Base.t
sizeof ty
is the size of ty
in bits. This function may return Int_Base.top
.
val osizeof : Cil_types.typ -> Int_Base.t
osizeof ty
is the size of ty
in bytes. This function may return Int_Base.top
.
val is_signed_int_enum_pointer : Cil_types.typ -> bool
true
means that the type is signed.
val signof_typeof_lval : Cil_types.lval -> bool
val sizeof_vid : Cil_types.varinfo -> Int_Base.t
val sizeof_lval : Cil_types.lval -> Int_Base.t
val sizeof_pointed : Cil_types.typ -> Int_Base.t
val osizeof_pointed : Cil_types.typ -> Int_Base.t
val sizeof_pointed_lval : Cil_types.lval -> Int_Base.t
val max_bit_address : unit -> Integer.t
val max_bit_size : unit -> Integer.t
val max_byte_address : unit -> Integer.t
val max_byte_size : unit -> Integer.t
Pretty printing
val pretty_bits : Cil_types.typ -> use_align:bool -> align:Abstract_interp.Rel.t -> rh_size:Integer.t -> start:Integer.t -> stop:Integer.t -> Stdlib.Format.formatter -> bool * Cil_types.typ option
Pretty prints a range of bits in a type for the user. Tries to find field names and array indexes, whenever possible.
Mapping from numeric offsets to symbolic ones.
val type_compatible : Cil_types.typ -> Cil_types.typ -> bool
Comparison of the shape of two types. Attributes are completely ignored.
type offset_match =
| MatchType of Cil_types.typ
(*Offset that has this type (modulo attributes)
*)| MatchSize of Integer.t
(*Offset that has a type of this size
*)| MatchFirst
(*Return first symbolic offset that matches
*)
We want to find a symbolic offset that corresponds to a numeric one, with one additional criterion:
val find_offset : Cil_types.typ -> offset:Integer.t -> offset_match -> Cil_types.offset * Cil_types.typ
find_offset typ ~offset ~size
finds a subtype t
of typ
that describes the type of the bits offset..offset+size-1
in typ
. May return a subtype of typ
, or a type that is a sub-array of an array type in typ
. Also returns a Cil_types.offset
off
that corresponds to offset
. (But we do not have the guarantee that typeof(off) == typ
, because of sub-arrays.)