package bap-std

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package bap-std
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A control transfer operation.

Jmp is the only way to transfer control from block to block. Jumps are guarded with conditions. The jump should be taken only if its condition is evaluated to true. When control flow reaches the end of block it should take the first jump with true condition. If there is no such jump, then program stops.

Jumps are further subdivided into categories:

  • goto - is a local control transfer instruction. The label can be only local to subroutine;
  • call - transfer a control to another subroutine. A call contains a continuation, i.e., a label to which we're hoping to return after subroutine returns the control to us. Of course, called subroutine can in general return to another position, or not to return at all.
  • ret - performs a return from subroutine
  • int - calls to interrupt subroutine. If interrupt returns, then continue with the provided label.
type t = jmp term
type dst
val reify : ?tid:tid -> ?cnd:Bap_core_theory.Theory.Bool.t Bap_core_theory.Theory.value -> ?alt:dst -> ?dst:dst -> unit -> t

reify () reifies inputs into a jump term.

Calls and interrupt subroutines invocations are represented with two edges: the normal edge (denoted dst) is the intra-procedural edge which connects the callsite with the fall-through destination (if such exists) and an alternative destination (denoted with alt) which represents an inter-procedural destination between the callsite and the call destination.

  • parameter cnd

    is a core theory term that denotes the guard condition of a conditional jump.

  • parameter alt

    is the alternative control flow destination.

  • parameter dst

    is the direct control flow destination

    @tid is the jump identifier, if not specified a fresh new identifier is created.

guard jmp if jmp is conditional, returns its condition.

with_guard jmp cnd updates the jump condition of jmp.

val dst : t -> dst option

dst jmp returns the intra-procedural destination of jmp.

val alt : t -> dst option

alt jmp returns the inter-procedural destination of jmp.

val resolved : tid -> dst

resolved dst creates a resolved destination.

indirect v creates an indirect jump destination.

The destination (or a set of destinations) is encoded with the Core Theory term v.

resolve dst resolves destination.

val create : ?tid:tid -> ?cond:exp -> jmp_kind -> t

create ?cond kind creates a jump of a given kind

val create_call : ?tid:tid -> ?cond:exp -> call -> t

create_call ?cond target transfer control to subroutine target

val create_goto : ?tid:tid -> ?cond:exp -> label -> t

create_goto ?cond label local jump

val create_ret : ?tid:tid -> ?cond:exp -> label -> t

create_ret ?cond label return from a procedure

val create_int : ?tid:tid -> ?cond:exp -> int -> tid -> t

create_int ?cond int_number return call interrupt subroutine

val kind : t -> jmp_kind

kind jmp evaluates to a kind of jump

val cond : t -> exp

cond jmp returns the jump guard condition

val exps : t -> exp seq

exps jmp returns a sequence of expressions occurring in different positions of a jump jmp, e.g., in cond, target, etc.

val free_vars : t -> Var.Set.t

free_vars jmp returns a set of all variables that are free in some expression in the jump jmp.

val map_exp : t -> f:(exp -> exp) -> t

map_exp jmp ~f applies f to each expression in a jmp, e.g., conditions and indirect labels.

val substitute : t -> exp -> exp -> t

substitute jmp x y substitutes x by y in all expressions that occur in jump jmp expressions.

val with_cond : t -> exp -> t

with_cond jmp c updates jump's guard condition

  • since 2.0.0
val with_kind : t -> jmp_kind -> t

with_kind jmp k updates jump's kind

  • since 2.0.0
val with_alt : t -> dst option -> t

with_alt jmp d updates jump's inter-procedural destination

  • since 2.1.0
val with_dst : t -> dst option -> t

with_dst jmp d updates jump's intra-procedural destination

  • since 2.1.0
val pp_slots : string list -> Format.formatter -> t -> unit

pp_slots names prints slots that are in names.

include Regular.Std.Regular.S with type t := t
include Core_kernel.Bin_prot.Binable.S with type t := t
include Bin_prot.Binable.S_only_functions with type t := t
val bin_size_t : t Bin_prot.Size.sizer
val bin_write_t : t Bin_prot.Write.writer
val bin_read_t : t Bin_prot.Read.reader
val __bin_read_t__ : (int -> t) Bin_prot.Read.reader

This function only needs implementation if t exposed to be a polymorphic variant. Despite what the type reads, this does *not* produce a function after reading; instead it takes the constructor tag (int) before reading and reads the rest of the variant t afterwards.

val bin_shape_t : Bin_prot.Shape.t
val bin_writer_t : t Bin_prot.Type_class.writer
val bin_reader_t : t Bin_prot.Type_class.reader
include Sexplib0.Sexpable.S with type t := t
val t_of_sexp : Sexplib0.Sexp.t -> t
val sexp_of_t : t -> Sexplib0.Sexp.t
include Ppx_compare_lib.Comparable.S with type t := t
include Regular.Std.Printable.S with type t := t
val to_string : t -> string

to_string x returns a human-readable representation of x

val str : unit -> t -> string

str () t is formatted output function that matches "%a" conversion format specifier in functions, that prints to string, e.g., sprintf, failwithf, errorf and, surprisingly all Lwt printing function, including Lwt_io.printf and logging (or any other function with type ('a,unit,string,...) formatN`. Example:

Or_error.errorf "type %a is not valid for %a"
  Type.str ty Exp.str exp
val pps : unit -> t -> string

synonym for str

val ppo : Core_kernel.Out_channel.t -> t -> unit

will print to a standard output_channel, useful for using in printf, fprintf, etc.

val pp_seq : Format.formatter -> t Core_kernel.Sequence.t -> unit

prints a sequence of values of type t

this will include pp function from Core that has type t printer, and can be used in Format.printf family of functions

include Core_kernel.Pretty_printer.S with type t := t
val pp : Base.Formatter.t -> t -> unit
include Core_kernel.Comparable.S_binable with type t := t
include Base.Comparable.S with type t := t
include Base.Comparisons.S with type t := t
include Base.Comparisons.Infix with type t := t
val (>=) : t -> t -> bool
val (<=) : t -> t -> bool
val (=) : t -> t -> bool
val (>) : t -> t -> bool
val (<) : t -> t -> bool
val (<>) : t -> t -> bool
val equal : t -> t -> bool
val compare : t -> t -> int

compare t1 t2 returns 0 if t1 is equal to t2, a negative integer if t1 is less than t2, and a positive integer if t1 is greater than t2.

val min : t -> t -> t
val max : t -> t -> t
val ascending : t -> t -> int

ascending is identical to compare. descending x y = ascending y x. These are intended to be mnemonic when used like List.sort ~compare:ascending and List.sort ~cmp:descending, since they cause the list to be sorted in ascending or descending order, respectively.

val descending : t -> t -> int
val between : t -> low:t -> high:t -> bool

between t ~low ~high means low <= t <= high

val clamp_exn : t -> min:t -> max:t -> t

clamp_exn t ~min ~max returns t', the closest value to t such that between t' ~low:min ~high:max is true.

Raises if not (min <= max).

val clamp : t -> min:t -> max:t -> t Base.Or_error.t
include Base.Comparator.S with type t := t
type comparator_witness
val validate_lbound : min:t Core.Maybe_bound.t -> t Validate.check
val validate_ubound : max:t Core.Maybe_bound.t -> t Validate.check
val validate_bound : min:t Core.Maybe_bound.t -> max:t Core.Maybe_bound.t -> t Validate.check
include Core.Comparator.S with type t := t with type comparator_witness := comparator_witness
include Core_kernel.Hashable.S_binable with type t := t
include Ppx_hash_lib.Hashable.S with type t := t
val hash_fold_t : Base.Hash.state -> t -> Base.Hash.state
val hash : t -> Base.Hash.hash_value
val hashable : t Base.Hashable.t
module Table : Core.Hashtbl.S_binable with type key = t
module Hash_set : Core.Hash_set.S_binable with type elt = t
module Hash_queue : Core.Hash_queue.S with type key = t
include Regular.Std.Data.S with type t := t
type info = string * [ `Ver of string ] * string option

name,Ver v,desc information attached to a particular reader or writer.

val version : string

Data representation version. After any change in data representation the version should be increased.

Serializers that are derived from a data representation must have the same version as a version of the data structure, from which it is derived. This kind of serializers can only read and write data of the same version.

Other serializers can actually read and write data independent on its representation version. A serializer, that can't store data of current version simply shouldn't be added to a set of serializers.

It is assumed, that if a reader and a writer has the same name and version, then whatever was written by the writer should be readable by the reader. The round-trip equality is not required, thus it is acceptable if some information is lost.

It is also possible, that a reader and a writer that has the same name are compatible. In that case it is recommended to use semantic versioning.

val size_in_bytes : ?ver:string -> ?fmt:string -> t -> int

size_in_bytes ?ver ?fmt datum returns the amount of bytes that is needed to represent datum in the given format and version

val of_bytes : ?ver:string -> ?fmt:string -> Regular.Std.bytes -> t

of_bytes ?ver ?fmt bytes deserializes a value from bytes.

val to_bytes : ?ver:string -> ?fmt:string -> t -> Regular.Std.bytes

to_bytes ?ver ?fmt datum serializes a datum to a sequence of bytes.

val blit_to_bytes : ?ver:string -> ?fmt:string -> Regular.Std.bytes -> t -> int -> unit

blit_to_bytes ?ver ?fmt buffer datum offset copies a serialized representation of datum into a buffer, starting from the offset.

val of_bigstring : ?ver:string -> ?fmt:string -> Core_kernel.bigstring -> t

of_bigstring ?ver ?fmt buf deserializes a datum from bigstring

val to_bigstring : ?ver:string -> ?fmt:string -> t -> Core_kernel.bigstring

of_bigstring ?ver ?fmt datum serializes a datum to a sequence of bytes represented as bigstring

val blit_to_bigstring : ?ver:string -> ?fmt:string -> Core_kernel.bigstring -> t -> int -> unit

blit_to_bigstring ?ver ?fmt buffer datum offset copies a serialized representation of datum into a buffer, starting from offset.

module Io : sig ... end

Input/Output functions for the given datum.

module Cache : sig ... end

Data cache.

val add_reader : ?desc:string -> ver:string -> string -> t Regular.Std.reader -> unit

add_reader ?desc ~ver name reader registers a new reader with a provided name, version ver and optional description desc

val add_writer : ?desc:string -> ver:string -> string -> t Regular.Std.writer -> unit

add_writer ?desc ~ver name writer registers a new writer with a provided name, version ver and optional description desc

val available_readers : unit -> info list

available_reader () lists available readers for the data type

val default_reader : unit -> info

default_reader returns information about default reader

val set_default_reader : ?ver:string -> string -> unit

set_default_reader ?ver name sets new default reader. If version is not specified then the latest available version is used. Raises an exception if a reader with a given name doesn't exist.

val with_reader : ?ver:string -> string -> (unit -> 'a) -> 'a

with_reader ?ver name operation temporary sets a default reader to a reader with a specified name and version. The default reader is restored after operation is finished.

val available_writers : unit -> info list

available_writer () lists available writers for the data type

val default_writer : unit -> info

default_writer returns information about the default writer

val set_default_writer : ?ver:string -> string -> unit

set_default_writer ?ver name sets new default writer. If version is not specified then the latest available version is used. Raises an exception if a writer with a given name doesn't exist.

val with_writer : ?ver:string -> string -> (unit -> 'a) -> 'a

with_writer ?ver name operation temporary sets a default writer to a writer with a specified name and version. The default writer is restored after operation is finished.

val default_printer : unit -> info option

default_writer optionally returns an information about default printer

val set_default_printer : ?ver:string -> string -> unit

set_default_printer ?ver name sets new default printer. If version is not specified then the latest available version is used. Raises an exception if a printer with a given name doesn't exist.

val with_printer : ?ver:string -> string -> (unit -> 'a) -> 'a

with_printer ?ver name operation temporary sets a default printer to a printer with a specified name and version. The default printer is restored after operation is finished.

Low level access to serializers

val find_reader : ?ver:string -> string -> t Regular.Std.reader option

find_reader ?ver name lookups a reader with a given name. If version is not specified, then a reader with maximum version is returned.

val find_writer : ?ver:string -> string -> t Regular.Std.writer option

find_writer ?ver name lookups a writer with a given name. If version is not specified, then a writer with maximum version is returned.

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