Source file dcode.ml
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open Types
open Ir
module Make
(Stats : EXPLORATION_STATISTICS_FULL)
(Path : Path.S)
(State : STATE) : sig
module Fiber :
Fiber.S
with type builtin :=
Virtual_address.t ->
Path.t ->
int ->
State.t ->
(State.t, Types.status) Result.t
type t
val single :
?hooks:(string * Script.Instr.t list) list * Script.env ->
task:unit Basic_types.Int.Htbl.t ->
Virtual_address.t ->
Lreader.t ->
int ->
[ `All ] Fiber.t * Instruction.t option
val script :
task:unit Basic_types.Int.Htbl.t ->
Virtual_address.t ->
?fallthrough:bool ->
Script.Instr.t list ->
Script.env ->
[ `All ] Fiber.t
val create :
?volatile:bool ->
?hooks:
(string * Script.Instr.t list) list Virtual_address.Map.t * Script.env ->
task:unit Basic_types.Int.Htbl.t ->
Virtual_address.t ->
Lreader.t ->
int ->
t
val get : t -> Virtual_address.t -> [ `All ] Fiber.t
module G : Ir.GRAPH with type t = t
val disasm : t -> Virtual_address.t -> G.vertex
module type CALLBACK = sig
val instruction_callback :
(Ast.Instr.t -> Script.env -> Ir.fallthrough list) option
val process_callback :
((module Ir.GRAPH with type t = 'a) -> 'a -> unit) option
val builtin_callback :
(Ir.builtin ->
(Virtual_address.t ->
Path.t ->
int ->
State.t ->
(State.t, Types.status) Result.t)
option)
option
end
val register_callback : (module CALLBACK) -> unit
val register_opcode_hook :
(Lreader.t -> (Script.Instr.t list * Script.env) option) -> unit
val set_annotation_printer :
(Format.formatter -> Virtual_address.t -> unit) option -> unit
end = struct
let annotation_printer = ref None
let set_annotation_printer fopt = annotation_printer := fopt
module type CALLBACK = sig
val instruction_callback :
(Ast.Instr.t -> Script.env -> Ir.fallthrough list) option
val process_callback :
((module Ir.GRAPH with type t = 'a) -> 'a -> unit) option
val builtin_callback :
(Ir.builtin ->
(Virtual_address.t ->
Path.t ->
int ->
State.t ->
(State.t, Types.status) Result.t)
option)
option
end
module Fiber = struct
type 'a t =
| Debug : { msg : string; mutable succ : [ `All ] t } -> [< `All ] t
| Print : { output : Output.t; mutable succ : [ `All ] t } -> [< `All ] t
| Step : {
addr : Virtual_address.t;
n : int;
mutable succ : [ `All ] t;
}
-> [< `All ] t
| Assign : {
var : Var.t;
rval : Expr.t;
mutable succ : [ `All ] t;
}
-> [< `All ] t
| Clobber : { var : Var.t; mutable succ : [ `All ] t } -> [< `All ] t
| Load : {
var : Var.t;
base : A.t;
dir : Machine.endianness;
addr : Expr.t;
mutable succ : [ `All ] t;
}
-> [< `All ] t
| Store : {
base : A.t;
dir : Machine.endianness;
addr : Expr.t;
rval : Expr.t;
mutable succ : [ `All ] t;
}
-> [< `All ] t
| Symbolize : { var : Var.t; mutable succ : [ `All ] t } -> [< `All ] t
| Assume : {
test : Expr.t;
mutable succ : [ `All ] t;
}
-> [< `Assume | `All ] t
| Assert : {
test : Expr.t;
mutable succ : [ `All ] t;
}
-> [< `Assert | `All ] t
| Branch : {
test : Expr.t;
mutable taken : [ `All ] t;
mutable fallthrough : [ `All ] t;
}
-> [< `Branch | `All ] t
| Goto : Virtual_address.t -> [< `All ] t
| Jump : Expr.t -> [< `Jump | `All ] t
| Halt : [< `All ] t
| Probe : {
kind : Probe.t;
mutable succ : [ `All ] t;
}
-> [< `Probe | `All ] t
| Builtin : {
f :
Virtual_address.t ->
Path.t ->
int ->
State.t ->
(State.t, Types.status) Result.t;
mutable succ : [ `All ] t;
}
-> [ `All ] t
| Cut : [< `All ] t
| Die : string -> [< `All ] t
let relink ?(taken = false) ~(pred : [ `All ] t) (succ : [ `All ] t) =
match pred with
| Debug t -> t.succ <- succ
| Print t -> t.succ <- succ
| Step t -> t.succ <- succ
| Assign t -> t.succ <- succ
| Clobber t -> t.succ <- succ
| Load t -> t.succ <- succ
| Store t -> t.succ <- succ
| Symbolize t -> t.succ <- succ
| Assume t -> t.succ <- succ
| Assert t -> t.succ <- succ
| Branch t when taken -> t.taken <- succ
| Branch t -> t.fallthrough <- succ
| Probe t -> t.succ <- succ
| Builtin t -> t.succ <- succ
| Goto _ | Jump _ | Cut | Halt | Die _ -> ()
end
module Var = struct
module Tag = Dba.Var.Tag
include Dba_types.Var
let rec collect (e : Dba.Expr.t) (d : Set.t) : Set.t =
match e with
| Cst _ -> d
| Var v -> Set.add v d
| Load (_, _, e, _) | Unary (_, e) -> collect e d
| Binary (_, e, e') -> collect e (collect e' d)
| Ite (e, e', e'') -> collect e (collect e' (collect e'' d))
let rec appears_in v (e : Dba.Expr.t) =
match e with
| Cst _ -> false
| Var v' -> equal v v'
| Load (_, _, e, _) | Unary (_, e) -> appears_in v e
| Binary (_, e, e') -> appears_in v e || appears_in v e'
| Ite (e, e', e'') ->
appears_in v e || appears_in v e' || appears_in v e''
end
type t = {
mutable n : int;
nodes : node I.Htbl.t;
preds : int list I.Htbl.t;
entries : int Virtual_address.Htbl.t;
mutable exits : I.Set.t;
base : Virtual_address.t;
reader : Lreader.t;
size : int;
volatile : bool;
mutable last : Instruction.t option;
mutable sinks : I.Set.t;
killset : Var.Set.t I.Htbl.t;
task : unit I.Htbl.t;
fibers : [ `All ] Fiber.t I.Htbl.t;
}
let is_deadstore t var vertex =
try Var.Set.mem var (I.Htbl.find t.killset vertex) with Not_found -> false
let entropy = Printf.sprintf "%%entropy%%%d"
let push todo addr vertex (tag : Dba.tag) =
todo :=
Virtual_address.Map.add addr
((vertex, tag)
:: (try Virtual_address.Map.find addr !todo with Not_found -> []))
!todo
let add_node t vertex node =
if vertex < t.n then raise (Invalid_argument "persistent vertex");
(match I.Htbl.find t.nodes vertex with
| exception Not_found -> ()
| Fallthrough { succ; _ } | Goto { succ = Some succ; _ } ->
I.Htbl.replace t.preds succ
(List.filter (( != ) vertex) (I.Htbl.find t.preds succ));
if succ < t.n then t.sinks <- I.Set.remove vertex t.sinks
| Branch { target; fallthrough; _ } ->
I.Htbl.replace t.preds target
(List.filter (( != ) vertex) (I.Htbl.find t.preds target));
I.Htbl.replace t.preds fallthrough
(List.filter (( != ) vertex) (I.Htbl.find t.preds fallthrough));
if target < t.n || fallthrough < t.n then
t.sinks <- I.Set.remove vertex t.sinks
| Goto { succ = None; _ } | Terminator _ ->
t.exits <- I.Set.remove vertex t.exits;
t.sinks <- I.Set.remove vertex t.sinks);
I.Htbl.replace t.nodes vertex node;
if not (I.Htbl.mem t.preds vertex) then I.Htbl.add t.preds vertex [];
match node with
| Fallthrough { succ; _ } | Goto { succ = Some succ; _ } ->
I.Htbl.replace t.preds succ
(vertex :: (try I.Htbl.find t.preds succ with Not_found -> []));
if succ < t.n then t.sinks <- I.Set.add vertex t.sinks
| Branch { target; fallthrough; _ } ->
I.Htbl.replace t.preds target
(vertex :: (try I.Htbl.find t.preds target with Not_found -> []));
I.Htbl.replace t.preds fallthrough
(vertex
:: (try I.Htbl.find t.preds fallthrough with Not_found -> []));
if target < t.n || fallthrough < t.n then
t.sinks <- I.Set.add vertex t.sinks
| Goto { succ = None; _ } | Terminator _ ->
t.exits <- I.Set.add vertex t.exits;
t.sinks <- I.Set.add vertex t.sinks
let make_goto t todo vertex target tag =
try
let succ = Virtual_address.Htbl.find t.entries target in
add_node t vertex (Goto { target; tag; succ = Some succ })
with Not_found ->
add_node t vertex (Goto { target; tag; succ = None });
if not t.volatile then push todo target vertex tag
module G : GRAPH with type t = t = struct
type nonrec t = t
let node { nodes; _ } vertex = I.Htbl.find nodes vertex
module V : Graph.Sig.VERTEX with type t = int = struct
type t = int
let compare = ( - )
let equal = ( == )
let hash = Fun.id
type label = t
let create = Fun.id
let label = Fun.id
end
type vertex = V.t
module E :
Graph.Sig.EDGE with type t = V.t * bool * V.t and type vertex = V.t =
struct
type t = V.t * bool * V.t
let compare = compare
type vertex = V.t
let src (vertex, _, _) = vertex
let dst (_, _, vertex) = vertex
type label = bool
let create src branch dst = (src, branch, dst)
let label (_, branch, _) = branch
end
type edge = E.t
let is_directed = true
let is_empty { nodes; _ } = I.Htbl.length nodes = 0
let nb_vertex { nodes; _ } = I.Htbl.length nodes
let nb_edges { preds; _ } =
I.Htbl.fold (fun _ preds n -> n + List.length preds) preds 0
let is_new_vertex { n; _ } vertex = vertex >= n
let out_degree { nodes; _ } vertex =
match I.Htbl.find nodes vertex with
| Terminator _ -> 0
| Goto { succ = None; _ } -> 0
| Goto { succ = Some _; _ } | Fallthrough _ -> 1
| Branch _ -> 2
let in_degree { preds; _ } vertex = List.length (I.Htbl.find preds vertex)
let mem_vertex { nodes; _ } vertex = I.Htbl.mem nodes vertex
let mem_edge { nodes; _ } src dst =
match I.Htbl.find nodes src with
| Fallthrough { succ; _ } | Goto { succ = Some succ; _ } -> succ = dst
| Branch { target; fallthrough; _ } -> target = dst || fallthrough = dst
| Goto { succ = None; _ } | Terminator _ -> false
let mem_edge_e { nodes; _ } (src, branch, dst) =
match I.Htbl.find nodes src with
| Fallthrough { succ; _ } | Goto { succ = Some succ; _ } -> succ = dst
| Branch { target; fallthrough; _ } ->
(branch && target = dst) || ((not branch) && fallthrough = dst)
| Goto { succ = None; _ } | Terminator _ -> false
let find_edge { nodes; _ } src dst =
match I.Htbl.find nodes src with
| Fallthrough { succ; _ }
| Goto { succ = Some succ; _ }
| Branch { fallthrough = succ; _ }
when succ = dst ->
(src, false, dst)
| Branch { target; _ } when target = dst -> (src, true, dst)
| Fallthrough _ | Goto _ | Branch _ | Terminator _ -> raise Not_found
let find_all_edges t src dst =
try [ find_edge t src dst ] with Not_found -> []
let succ { nodes; _ } vertex =
match I.Htbl.find nodes vertex with
| Fallthrough { succ; _ } | Goto { succ = Some succ; _ } -> [ succ ]
| Branch { target; fallthrough; _ } -> [ target; fallthrough ]
| Goto { succ = None; _ } | Terminator _ -> []
let pred { preds; _ } vertex = I.Htbl.find preds vertex
let succ_e { nodes; _ } vertex =
match I.Htbl.find nodes vertex with
| Fallthrough { succ; _ } | Goto { succ = Some succ; _ } ->
[ (vertex, false, succ) ]
| Branch { target; fallthrough; _ } ->
[ (vertex, true, target); (vertex, false, fallthrough) ]
| Goto { succ = None; _ } | Terminator _ -> []
let pred_e t vertex =
List.map (fun src -> find_edge t src vertex) (pred t vertex)
let iter_vertex f { nodes; _ } =
let last = I.Htbl.length nodes - 1 in
for i = 0 to last do
f i
done
let iter_new_vertex f { n; nodes; _ } =
let last = I.Htbl.length nodes - 1 in
for i = n to last do
f i
done
let iter_entries f { entries; _ } =
Virtual_address.Htbl.iter (fun _ i -> f i) entries
let iter_exits f { exits; _ } = I.Set.iter f exits
let fold_vertex f { nodes; _ } data =
I.Htbl.fold (fun vertex _ -> f vertex) nodes data
let iter_edges f { nodes; _ } =
I.Htbl.iter
(fun vertex node ->
match node with
| Fallthrough { succ; _ } | Goto { succ = Some succ; _ } ->
f vertex succ
| Branch { target; fallthrough; _ } ->
f vertex target;
f vertex fallthrough
| Goto { succ = None; _ } | Terminator _ -> ())
nodes
let fold_edges f { nodes; _ } data =
I.Htbl.fold
(fun vertex node data ->
match node with
| Fallthrough { succ; _ } | Goto { succ = Some succ; _ } ->
f vertex succ data
| Branch { target; fallthrough; _ } ->
f vertex target (f vertex fallthrough data)
| Goto { succ = None; _ } | Terminator _ -> data)
nodes data
let iter_edges_e f { nodes; _ } =
I.Htbl.iter
(fun vertex node ->
match node with
| Fallthrough { succ; _ } | Goto { succ = Some succ; _ } ->
f (vertex, false, succ)
| Branch { target; fallthrough; _ } ->
f (vertex, true, target);
f (vertex, false, fallthrough)
| Goto { succ = None; _ } | Terminator _ -> ())
nodes
let fold_edges_e f { nodes; _ } data =
I.Htbl.fold
(fun vertex node data ->
match node with
| Fallthrough { succ; _ } | Goto { succ = Some succ; _ } ->
f (vertex, false, succ) data
| Branch { target; fallthrough; _ } ->
f (vertex, true, target) (f (vertex, false, fallthrough) data)
| Goto { succ = None; _ } | Terminator _ -> data)
nodes data
let map_vertex f r =
let t =
{
r with
nodes = I.Htbl.create (I.Htbl.length r.nodes);
preds = I.Htbl.create (I.Htbl.length r.preds);
exits = I.Set.map f r.exits;
sinks = I.Set.map f r.sinks;
entries =
Virtual_address.Htbl.create (Virtual_address.Htbl.length r.entries);
killset = I.Htbl.create (I.Htbl.length r.killset);
}
in
I.Htbl.iter
(fun vertex node -> I.Htbl.add t.nodes (f vertex) (shuffle f node))
r.nodes;
I.Htbl.iter
(fun vertex preds -> I.Htbl.add t.preds (f vertex) (List.map f preds))
r.preds;
Virtual_address.Htbl.iter
(fun addr vertex -> Virtual_address.Htbl.add t.entries addr (f vertex))
r.entries;
I.Htbl.iter
(fun vertex set -> I.Htbl.add t.killset (f vertex) set)
r.killset;
t
let iter_succ f { nodes; _ } vertex =
match I.Htbl.find nodes vertex with
| Fallthrough { succ; _ } | Goto { succ = Some succ; _ } -> f succ
| Branch { target; fallthrough; _ } ->
f target;
f fallthrough
| Goto { succ = None; _ } | Terminator _ -> ()
let iter_pred f { preds; _ } vertex = List.iter f (I.Htbl.find preds vertex)
let fold_succ f { nodes; _ } vertex data =
match I.Htbl.find nodes vertex with
| Fallthrough { succ; _ } | Goto { succ = Some succ; _ } -> f succ data
| Branch { target; fallthrough; _ } -> f target (f fallthrough data)
| Goto { succ = None; _ } | Terminator _ -> data
let fold_pred f { preds; _ } vertex data =
List.fold_left (Fun.flip f) data (I.Htbl.find preds vertex)
let iter_succ_e f { nodes; _ } vertex =
match I.Htbl.find nodes vertex with
| Fallthrough { succ; _ } | Goto { succ = Some succ; _ } ->
f (vertex, false, succ)
| Branch { target; fallthrough; _ } ->
f (vertex, true, target);
f (vertex, false, fallthrough)
| Goto { succ = None; _ } | Terminator _ -> ()
let iter_pred_e f t vertex =
List.iter
(fun src -> f (find_edge t src vertex))
(I.Htbl.find t.preds vertex)
let fold_succ_e f { nodes; _ } vertex data =
match I.Htbl.find nodes vertex with
| Fallthrough { succ; _ } | Goto { succ = Some succ; _ } ->
f (vertex, false, succ) data
| Branch { target; fallthrough; _ } ->
f (vertex, true, target) (f (vertex, false, fallthrough) data)
| Goto { succ = None; _ } | Terminator _ -> data
let fold_pred_e f t vertex data =
List.fold_left
(fun data src -> f (find_edge t src vertex) data)
data
(I.Htbl.find t.preds vertex)
let insert_before t vertex kind =
let cur = I.Htbl.length t.nodes in
iter_pred
(fun pred ->
add_node t pred
(shuffle (fun i -> if i = vertex then cur else i) (node t pred)))
t vertex;
add_node t cur (Fallthrough { kind; succ = vertex });
cur
let insert_list_before t vertex = function
| [] -> vertex
| kind :: tl ->
let vertex' = insert_before t vertex kind in
List.iter (fun kind -> ignore (insert_before t vertex kind)) tl;
vertex'
end
let instruction_callback = ref []
let process_callback = Queue.create ()
let builtin_callback = ref []
let register_callback callback =
let module C = (val callback : CALLBACK) in
Option.iter
(fun callback ->
instruction_callback := callback :: !instruction_callback)
C.instruction_callback;
Option.iter
(fun callback ->
Queue.push
(callback (module G : Ir.GRAPH with type t = G.t))
process_callback)
C.process_callback;
Option.iter
(fun callback -> builtin_callback := callback :: !builtin_callback)
C.builtin_callback
let rec resolve_instruction inst env callbacks =
match callbacks with
| [] -> raise (Invalid_argument "missing instruction callback")
| convert :: callbacks -> (
match convert inst env with
| [] -> resolve_instruction inst env callbacks
| l -> l)
let rec resolve_builtin p callbacks =
match callbacks with
| [] -> raise (Invalid_argument "missing builtin callback")
| exec :: callbacks -> (
match exec p with None -> resolve_builtin p callbacks | Some f -> f)
let opcode_hook = ref []
let register_opcode_hook hook = opcode_hook := hook :: !opcode_hook
let analyze_fallthrough kind killset =
match kind with
| Nop | Debug _ | Instruction _ | Hook _ -> killset
| Clobber var | Forget var | Symbolize var -> Var.Set.add var killset
| Assign { var; rval } ->
if Var.Set.mem var killset then killset
else
Var.Set.diff (Var.Set.add var killset)
(Var.collect rval Var.Set.empty)
| Load { var; addr; _ } ->
Var.Set.diff (Var.Set.add var killset) (Var.collect addr Var.Set.empty)
| Store { addr; rval; _ } ->
Var.Set.diff
(Var.Set.diff killset (Var.collect addr Var.Set.empty))
(Var.collect rval Var.Set.empty)
| Assume expr
| Assert expr
| Print (Value (_, expr))
| Enumerate { enum = expr; _ } ->
Var.Set.diff killset (Var.collect expr Var.Set.empty)
| Print _ | Reach _ | Builtin _ -> Var.Set.empty
let analyze_branch test target fallthrough =
match (target, fallthrough) with
| None, None -> assert false
| None, Some killset | Some killset, None ->
Var.Set.diff killset (Var.collect test Var.Set.empty)
| Some target, Some fallthrough ->
let killset = Var.Set.inter target fallthrough in
Var.Set.diff killset (Var.collect test Var.Set.empty)
let rec closure t todo push =
if not (Queue.is_empty todo) then
let vertex = Queue.pop todo in
let killset =
match G.node t vertex with
| Fallthrough { kind; succ } ->
analyze_fallthrough kind (I.Htbl.find t.killset succ)
| Branch { test; target; fallthrough } ->
analyze_branch test
(I.Htbl.find_opt t.killset target)
(I.Htbl.find_opt t.killset fallthrough)
| Goto { succ = Some succ; _ } -> I.Htbl.find t.killset succ
| Goto { succ = None; _ } | Terminator _ -> assert false
in
match I.Htbl.find t.killset vertex with
| old when Var.Set.equal old killset -> closure t todo push
| (exception Not_found) | _ ->
I.Htbl.replace t.killset vertex killset;
G.iter_pred push t vertex;
closure t todo push
let analyze t =
let todo = Queue.create () in
let push = Fun.flip Queue.push todo in
I.Set.iter
(fun vertex ->
G.iter_pred push t vertex;
match G.node t vertex with
| Fallthrough { kind; succ } ->
I.Htbl.add t.killset vertex
(analyze_fallthrough kind (I.Htbl.find t.killset succ))
| Branch { test; target; fallthrough } ->
I.Htbl.add t.killset vertex
(analyze_branch test
(I.Htbl.find_opt t.killset target)
(I.Htbl.find_opt t.killset fallthrough))
| Goto { succ = Some succ; _ } ->
I.Htbl.add t.killset vertex (I.Htbl.find t.killset succ)
| Goto { succ = None; _ } | Terminator _ ->
I.Htbl.add t.killset vertex Var.Set.empty)
t.sinks;
closure t todo push;
t.sinks <- I.Set.empty
let _export_to_file t =
let filename = Filename.temp_file "dba" ".dot" in
let oc = open_out_bin filename in
let module C_dot = struct
include G
let graph_attributes _ = []
let default_vertex_attributes _ = [ `Shape `Box ]
let vertex_name v = Format.asprintf "\"%d: %a\"" v pp_node (node t v)
let vertex_attributes v =
match node t v with
| Fallthrough { kind = Forget _; _ } -> [ `Color 0xff0000 ]
| Fallthrough
{
kind =
( Assign { var; _ }
| Clobber var
| Load { var; _ }
| Symbolize var );
succ;
}
when is_deadstore t var succ ->
[ `Color 0xff0000 ]
| _ -> []
let get_subgraph _ = None
let default_edge_attributes _ = []
let edge_attributes _ = []
end in
let module D = Graph.Graphviz.Dot (C_dot) in
D.output_graph oc t;
close_out oc;
filename
let add_dhunk t todo vertex hunk =
let next = ref (vertex + Dhunk.length hunk) in
let temps = ref Var.Set.empty and exits = ref I.Set.empty in
Dhunk.iteri
~f:(fun i inst ->
let cur = vertex + i in
match inst with
| Assign (Var var, rval, succ) ->
if var.info = Var.Tag.Temp then temps := Var.Set.add var !temps;
add_node t cur
(Fallthrough { kind = Assign { var; rval }; succ = vertex + succ })
| Assign (Restrict (var, { hi; lo }), rval, succ) ->
if var.info = Var.Tag.Temp then temps := Var.Set.add var !temps;
add_node t cur
(Fallthrough
{
kind =
Assign
{
var;
rval = Dba_utils.Expr.complement rval ~hi ~lo var;
};
succ = vertex + succ;
})
| Assign (Store (_, dir, addr, base), rval, succ) ->
add_node t cur
(Fallthrough
{
kind = Store { base; dir; addr; rval };
succ = vertex + succ;
})
| Nondet (Var var, succ) | Undef (Var var, succ) ->
if var.info = Var.Tag.Temp then temps := Var.Set.add var !temps;
let kind =
match inst with Nondet _ -> Symbolize var | _ -> Clobber var
in
add_node t cur (Fallthrough { kind; succ = vertex + succ })
| Nondet (Restrict (var, { hi; lo }), succ)
| Undef (Restrict (var, { hi; lo }), succ) ->
if var.info = Var.Tag.Temp then temps := Var.Set.add var !temps;
let size' = hi - lo + 1 in
let name' = entropy size' in
let var' = Dba.Var.temporary name' (Size.Bit.create size') in
temps := Var.Set.add var' !temps;
let rval = Dba_utils.Expr.complement (Expr.v var') ~lo ~hi var in
let succ' = !next in
incr next;
let kind =
match inst with Nondet _ -> Symbolize var' | _ -> Clobber var'
in
add_node t cur (Fallthrough { kind; succ = succ' });
add_node t succ'
(Fallthrough { kind = Assign { var; rval }; succ = vertex + succ })
| Nondet (Store (bytes, dir, addr, base), succ)
| Undef (Store (bytes, dir, addr, base), succ) ->
let size' = 8 * bytes in
let name' = entropy size' in
let var' = Dba.Var.temporary name' (Size.Bit.create size') in
let rval = Expr.v var' in
let succ' = !next in
incr next;
let kind =
match inst with Nondet _ -> Symbolize var' | _ -> Clobber var'
in
add_node t cur (Fallthrough { kind; succ = succ' });
add_node t succ'
(Fallthrough
{
kind = Store { base; dir; addr; rval };
succ = vertex + succ;
})
| Assume (test, succ) ->
add_node t cur
(Fallthrough { kind = Assume test; succ = vertex + succ })
| Assert (test, succ) ->
add_node t cur
(Fallthrough { kind = Assert test; succ = vertex + succ })
| If (test, JInner target, fallthrough) ->
add_node t cur
(Branch
{
test;
target = vertex + target;
fallthrough = vertex + fallthrough;
})
| If (test, JOuter { base; _ }, fallthrough) ->
let succ = !next in
incr next;
exits := I.Set.add succ !exits;
make_goto t todo succ base Default;
add_node t cur
(Branch
{ test; target = succ; fallthrough = vertex + fallthrough })
| DJump (target, tag) ->
exits := I.Set.add cur !exits;
add_node t cur (Terminator (Jump { target; tag }))
| SJump (JOuter { base; _ }, tag) ->
exits := I.Set.add cur !exits;
make_goto t todo cur base tag
| SJump (JInner succ, _) ->
add_node t cur (Fallthrough { kind = Nop; succ = vertex + succ })
| Stop (None | Some OK) ->
exits := I.Set.add cur !exits;
add_node t cur (Terminator Halt)
| Stop (Some KO) ->
exits := I.Set.add cur !exits;
add_node t cur (Terminator (Die "KO"))
| Stop (Some (Undecoded msg | Unsupported msg)) ->
exits := I.Set.add cur !exits;
add_node t cur (Terminator (Die msg)))
hunk;
I.Set.iter
(fun vertex ->
let temps =
match G.node t vertex with
| Terminator (Jump { target; _ }) ->
Var.Set.diff !temps (Var.collect target Var.Set.empty)
| _ -> !temps
in
Var.Set.iter
(fun var -> ignore (G.insert_before t vertex (Forget var)))
temps)
!exits
let mk_label =
let n = ref Suid.zero in
fun _ ->
n := Suid.incr !n;
Suid.to_string !n
let inline_dhunk t todo labels tolink temps exits vertex hunk =
let anchors = Array.init (Dhunk.length hunk) mk_label in
let mk_local_goto anchors vertex tolink i succ =
if succ <> i + 1 then (
S.Htbl.replace tolink (Array.get anchors succ)
((None, !vertex)
::
(try S.Htbl.find tolink (Array.get anchors succ)
with Not_found -> []));
incr vertex)
in
Dhunk.iteri
~f:(fun i inst ->
S.Htbl.add labels (Array.get anchors i) !vertex;
match inst with
| Assign (Var var, rval, succ) ->
if var.info = Temp then temps := Var.Set.add var !temps;
add_node t !vertex
(Fallthrough { kind = Assign { var; rval }; succ = !vertex + 1 });
incr vertex;
mk_local_goto anchors vertex tolink i succ
| Assign (Restrict (var, { hi; lo }), rval, succ) ->
if var.info = Temp then temps := Var.Set.add var !temps;
add_node t !vertex
(Fallthrough
{
kind =
Assign
{
var;
rval = Dba_utils.Expr.complement rval ~hi ~lo var;
};
succ = !vertex + 1;
});
incr vertex;
mk_local_goto anchors vertex tolink i succ
| Assign (Store (_, dir, addr, base), rval, succ) ->
add_node t !vertex
(Fallthrough
{ kind = Store { base; dir; addr; rval }; succ = !vertex + 1 });
incr vertex;
mk_local_goto anchors vertex tolink i succ
| Undef (Var var, succ) ->
if var.info = Temp then temps := Var.Set.add var !temps;
add_node t !vertex
(Fallthrough { kind = Clobber var; succ = !vertex + 1 });
incr vertex;
mk_local_goto anchors vertex tolink i succ
| Undef _ ->
raise
(Invalid_argument
(Format.asprintf "unexpected instruction kind %a"
Dba_printer.Ascii.pp_instruction inst))
| Nondet (Var var, succ) ->
if var.info = Temp then temps := Var.Set.add var !temps;
add_node t !vertex
(Fallthrough { kind = Symbolize var; succ = !vertex + 1 });
incr vertex;
mk_local_goto anchors vertex tolink i succ
| Nondet (Restrict (var, { hi; lo }), succ) ->
if var.info = Temp then temps := Var.Set.add var !temps;
let size' = hi - lo + 1 in
let name' = entropy size' in
let var' = Dba.Var.temporary name' (Size.Bit.create size') in
temps := Var.Set.add var' !temps;
let rval = Dba_utils.Expr.complement (Expr.v var') ~lo ~hi var in
add_node t !vertex
(Fallthrough { kind = Symbolize var'; succ = !vertex + 1 });
incr vertex;
add_node t !vertex
(Fallthrough { kind = Assign { var; rval }; succ = !vertex + 1 });
incr vertex;
mk_local_goto anchors vertex tolink i succ
| Nondet (Store (bytes, dir, addr, base), succ) ->
let size' = 8 * bytes in
let name' = entropy size' in
let var' = Dba.Var.temporary name' (Size.Bit.create size') in
temps := Var.Set.add var' !temps;
let rval = Expr.v var' in
add_node t !vertex
(Fallthrough { kind = Symbolize var'; succ = !vertex + 1 });
incr vertex;
add_node t !vertex
(Fallthrough
{ kind = Store { base; dir; addr; rval }; succ = !vertex + 1 });
incr vertex;
mk_local_goto anchors vertex tolink i succ
| Assume (test, succ) ->
add_node t !vertex
(Fallthrough { kind = Assume test; succ = !vertex + 1 });
incr vertex;
mk_local_goto anchors vertex tolink i succ
| Assert (test, succ) ->
add_node t !vertex
(Fallthrough { kind = Assert test; succ = !vertex + 1 });
incr vertex;
mk_local_goto anchors vertex tolink i succ
| If (test, JInner target, fallthrough) ->
S.Htbl.replace tolink (Array.get anchors target)
((Some test, !vertex)
::
(try S.Htbl.find tolink (Array.get anchors target)
with Not_found -> []));
incr vertex;
mk_local_goto anchors vertex tolink i fallthrough
| If (test, JOuter { base; _ }, fallthrough) ->
S.Htbl.replace tolink
(Array.get anchors fallthrough)
((Some (Dba.Expr.lognot test), !vertex)
::
(try S.Htbl.find tolink (Array.get anchors fallthrough)
with Not_found -> []));
incr vertex;
exits := I.Set.add !vertex !exits;
make_goto t todo !vertex base Default
| DJump (target, tag) ->
exits := I.Set.add !vertex !exits;
add_node t !vertex (Terminator (Jump { target; tag }));
incr vertex
| SJump (JOuter { base; _ }, tag) ->
exits := I.Set.add !vertex !exits;
make_goto t todo !vertex base tag;
incr vertex
| SJump (JInner succ, _) ->
S.Htbl.replace tolink (Array.get anchors succ)
((None, !vertex)
::
(try S.Htbl.find tolink (Array.get anchors succ)
with Not_found -> []));
incr vertex
| Stop (None | Some OK) ->
exits := I.Set.add !vertex !exits;
add_node t !vertex (Terminator Halt);
incr vertex
| Stop (Some KO) ->
exits := I.Set.add !vertex !exits;
add_node t !vertex (Terminator (Die "KO"));
incr vertex
| Stop (Some (Undecoded msg | Unsupported msg)) ->
exits := I.Set.add !vertex !exits;
add_node t !vertex (Terminator (Die msg));
incr vertex)
hunk
let add_script t todo addr stmts env fallthrough =
let vertex = ref (I.Htbl.length t.nodes) in
let labels = S.Htbl.create 16
and tolink = S.Htbl.create 16
and temps = ref Var.Set.empty
and exits = ref I.Set.empty in
List.iter
(function
| Script.Instr.Nop -> ()
| Script.Instr.Label name -> S.Htbl.add labels name !vertex
| Script.Instr.Assign (lval, rval) -> (
let lval = Script.eval_loc lval env in
let rval =
Script.eval_expr ~size:(Dba.LValue.size_of lval) rval env
in
match lval with
| Var var ->
if var.info = Temp then temps := Var.Set.add var !temps;
add_node t !vertex
(Fallthrough
{ kind = Assign { var; rval }; succ = !vertex + 1 });
incr vertex
| Restrict (var, { hi; lo }) ->
if var.info = Temp then temps := Var.Set.add var !temps;
add_node t !vertex
(Fallthrough
{
kind =
Assign
{
var;
rval = Dba_utils.Expr.complement rval ~hi ~lo var;
};
succ = !vertex + 1;
});
incr vertex
| Store (_, dir, addr, base) ->
add_node t !vertex
(Fallthrough
{
kind = Store { base; dir; addr; rval };
succ = !vertex + 1;
});
incr vertex)
| Script.Instr.Nondet lval -> (
match Script.eval_loc lval env with
| Var var ->
if var.info = Temp then temps := Var.Set.add var !temps;
add_node t !vertex
(Fallthrough { kind = Symbolize var; succ = !vertex + 1 });
incr vertex
| Restrict (var, { hi; lo }) ->
if var.info = Temp then temps := Var.Set.add var !temps;
let size' = hi - lo + 1 in
let name' = entropy size' in
let var' = Dba.Var.temporary name' (Size.Bit.create size') in
temps := Var.Set.add var' !temps;
let rval =
Dba_utils.Expr.complement (Expr.v var') ~lo ~hi var
in
add_node t !vertex
(Fallthrough { kind = Symbolize var'; succ = !vertex + 1 });
incr vertex;
add_node t !vertex
(Fallthrough
{ kind = Assign { var; rval }; succ = !vertex + 1 });
incr vertex
| Store (bytes, dir, addr, base) ->
let size' = 8 * bytes in
let name' = entropy size' in
let var' = Dba.Var.temporary name' (Size.Bit.create size') in
temps := Var.Set.add var' !temps;
let rval = Expr.v var' in
add_node t !vertex
(Fallthrough { kind = Symbolize var'; succ = !vertex + 1 });
incr vertex;
add_node t !vertex
(Fallthrough
{
kind = Store { base; dir; addr; rval };
succ = !vertex + 1;
});
incr vertex)
| Script.Instr.Undef ((_, p) as lval) -> (
match Script.eval_loc lval env with
| Var var ->
if var.info = Temp then temps := Var.Set.add var !temps;
add_node t !vertex
(Fallthrough { kind = Clobber var; succ = !vertex + 1 });
incr vertex
| _ -> raise (Script.Invalid_operation (Script.Expr.loc lval, p)))
| Script.Instr.Assume test ->
let test = Script.eval_expr ~size:1 test env in
add_node t !vertex
(Fallthrough { kind = Assume test; succ = !vertex + 1 });
incr vertex
| Script.Instr.Assert test ->
let test = Script.eval_expr ~size:1 test env in
add_node t !vertex
(Fallthrough { kind = Assert test; succ = !vertex + 1 });
incr vertex
| Script.Instr.If (test, target) ->
let test = Script.eval_expr ~size:1 test env in
S.Htbl.replace tolink target
((Some test, !vertex)
:: (try S.Htbl.find tolink target with Not_found -> []));
incr vertex
| Script.Instr.Goto target ->
S.Htbl.replace tolink target
((None, !vertex)
:: (try S.Htbl.find tolink target with Not_found -> []));
incr vertex
| Script.Instr.Jump target -> (
exits := I.Set.add !vertex !exits;
match Script.eval_expr ~size:env.wordsize target env with
| Cst bv ->
make_goto t todo !vertex
(Virtual_address.of_bitvector bv)
Default;
incr vertex
| target ->
add_node t !vertex (Terminator (Jump { target; tag = Default }));
incr vertex)
| Script.Instr.Halt ->
exits := I.Set.add !vertex !exits;
add_node t !vertex (Terminator Halt);
incr vertex
| Script.Cut None ->
exits := I.Set.add !vertex !exits;
add_node t !vertex (Terminator Cut);
incr vertex
| Script.Cut (Some test) ->
let test = Script.eval_expr ~size:1 test env in
add_node t !vertex
(Branch { test; target = !vertex + 1; fallthrough = !vertex + 2 });
incr vertex;
exits := I.Set.add !vertex !exits;
add_node t !vertex (Terminator Cut);
incr vertex
| Script.Reach (n, guard, actions) ->
let tid = I.Htbl.length t.task in
I.Htbl.add t.task tid ();
let guard =
Option.fold ~none:Dba.Expr.one
~some:(fun test -> Script.eval_expr ~size:1 test env)
guard
in
let actions = List.map (Script.Output.eval env) actions in
add_node t !vertex
(Fallthrough
{ kind = Reach { tid; n; guard; actions }; succ = !vertex + 1 });
incr vertex
| Script.Print output ->
add_node t !vertex
(Fallthrough
{
kind = Print (Script.Output.eval env output);
succ = !vertex + 1;
});
incr vertex
| Script.Enumerate (n, enum) ->
let tid = I.Htbl.length t.task in
I.Htbl.add t.task tid ();
let enum = Script.eval_expr enum env in
add_node t !vertex
(Fallthrough
{
kind = Enumerate { tid; enum; format = Hex; n };
succ = !vertex + 1;
});
incr vertex
| Script.Argument (lval, n) -> (
let rval = Isa_helper.get_arg n in
let lval = Script.eval_loc ~size:(Dba.Expr.size_of rval) lval env in
match lval with
| Var var ->
if var.info = Temp then temps := Var.Set.add var !temps;
add_node t !vertex
(Fallthrough
{ kind = Assign { var; rval }; succ = !vertex + 1 });
incr vertex
| Restrict (var, { hi; lo }) ->
if var.info = Temp then temps := Var.Set.add var !temps;
add_node t !vertex
(Fallthrough
{
kind =
Assign
{
var;
rval = Dba_utils.Expr.complement rval ~hi ~lo var;
};
succ = !vertex + 1;
});
incr vertex
| Store (_, dir, addr, base) ->
add_node t !vertex
(Fallthrough
{
kind = Store { base; dir; addr; rval };
succ = !vertex + 1;
});
incr vertex)
| Script.Return value ->
let value =
Option.map
(fun value -> Script.eval_expr ~size:env.wordsize value env)
value
in
let hunk = Isa_helper.make_return ?value () in
inline_dhunk t todo labels tolink temps exits vertex hunk
| Script.Error msg ->
add_node t !vertex (Terminator (Die msg));
incr vertex
| inst ->
List.iter
(fun kind ->
add_node t !vertex (Fallthrough { kind; succ = !vertex + 1 });
incr vertex)
(resolve_instruction inst env !instruction_callback))
stmts;
S.Htbl.iter
(fun label preds ->
let target = S.Htbl.find labels label in
List.iter
(fun (test, pred) ->
match test with
| None ->
add_node t pred (Fallthrough { kind = Nop; succ = target })
| Some test ->
add_node t pred
(Branch { test; target; fallthrough = pred + 1 }))
preds)
tolink;
if stmts = [] || I.Htbl.mem t.preds !vertex then (
exits := I.Set.add !vertex !exits;
if fallthrough then (
add_node t !vertex (Goto { target = addr; tag = Default; succ = None });
push todo addr !vertex Default)
else add_node t !vertex (Terminator Halt));
I.Set.iter
(fun vertex ->
Var.Set.iter
(fun var -> ignore (G.insert_before t vertex (Forget var)))
!temps)
!exits
let add_hook t todo addr anchor stmts env fallthrough =
let vertex = I.Htbl.length t.nodes in
let succ = vertex + 1 in
let info = Format.sprintf "hook at %s" anchor in
add_node t vertex (Fallthrough { kind = Hook { addr; info }; succ });
if not (Virtual_address.Htbl.mem t.entries addr) then
Virtual_address.Htbl.add t.entries addr vertex;
(try
List.iter
(fun (pred, tag) ->
add_node t pred (Goto { target = addr; tag; succ = Some vertex }))
(Virtual_address.Map.find addr !todo);
todo := Virtual_address.Map.remove addr !todo
with Not_found -> ());
add_script t todo addr stmts env fallthrough
let rec resolve_decode t todo addr pos decoders =
match decoders with
| [] ->
let inst, _ = Disasm_core.decode_from t.reader addr in
t.last <- Some inst;
let hunk = Instruction.hunk inst in
let vertex = I.Htbl.length t.nodes in
add_node t vertex
(Fallthrough { kind = Instruction inst; succ = vertex + 1 });
add_dhunk t todo (vertex + 1) hunk;
vertex
| decode :: decoders -> (
match decode t.reader with
| None ->
Lreader.rewind t.reader (Lreader.get_pos t.reader - pos);
resolve_decode t todo addr pos decoders
| Some (stmts, env) ->
let pos' = Lreader.get_pos t.reader in
let vertex = I.Htbl.length t.nodes in
let succ = vertex + 1 in
let opcode = Lreader.get_slice t.reader ~lo:pos ~hi:(pos' - 1) in
let info =
Format.asprintf "hook for opcode %a" Binstream.pp
(Binstream.of_bytes (Bytes.unsafe_to_string opcode))
in
add_node t vertex (Fallthrough { kind = Hook { addr; info }; succ });
add_script t todo addr
(List.append stmts
[
Ast.Instr.Jump
( Ast.Expr.Int
( Virtual_address.to_bigint
(Virtual_address.add_int (Bytes.length opcode) addr),
None ),
Lexing.dummy_pos );
])
env false;
vertex)
let rec disasm t todo =
if not (Virtual_address.Map.is_empty !todo) then (
let addr, tolink = Virtual_address.Map.choose !todo in
todo := Virtual_address.Map.remove addr !todo;
let pos' = Virtual_address.diff addr t.base in
if pos' < 0 || pos' >= t.size then disasm t todo
else
let pos = Lreader.get_pos t.reader in
if pos > pos' then Lreader.rewind t.reader (pos - pos')
else Lreader.advance t.reader (pos' - pos);
let vertex =
resolve_decode t todo addr (Lreader.get_pos t.reader) !opcode_hook
in
if not (Virtual_address.Htbl.mem t.entries addr) then
Virtual_address.Htbl.add t.entries addr vertex;
List.iter
(fun (pred, tag) ->
add_node t pred (Goto { target = addr; tag; succ = Some vertex }))
tolink;
Stats.register_address addr;
disasm t todo)
let =
let rec fold m (e : Expr.t) =
match e with
| Cst _ -> (m, e)
| Var _ -> (m, e)
| Load (sz, dir, addr, base) ->
let m', addr' = fold m addr in
let k = (sz, dir, addr', base) in
let v =
try List.assoc k m'
with Not_found ->
Dba.Var.(
create
(Printf.sprintf "$$%d" (List.length m'))
~bitsize:(Size.Bit.create (8 * sz))
~tag:Tag.Temp)
in
((k, v) :: m', Expr.v v)
| Unary (o, x) ->
let m', x' = fold m x in
let e' = if x == x' then e else Expr.unary o x' in
(m', e')
| Binary (o, x, y) ->
let m', x' = fold m x in
let m', y' = fold m' y in
let e' = if x == x' && y == y' then e else Expr.binary o x' y' in
(m', e')
| Ite (c, x, y) ->
let m', c' = fold m c in
let m', x' = fold m' x in
let m', y' = fold m' y in
let e' =
if c == c' && x == x' && y == y' then e else Expr.ite c' x' y'
in
(m', e')
in
fold
let define_loads kind =
match kind with
| Nop | Debug _ | Print _ | Instruction _ | Hook _ | Clobber _ | Forget _
| Symbolize _ | Enumerate _ | Reach _ | Builtin _ ->
([], kind)
| Assign { var; rval = Load (_, dir, addr, base) } -> (
match extract_loads [] addr with
| [], _ -> ([], Load { var; base; dir; addr })
| loads, addr -> (loads, Load { var; base; dir; addr }))
| Assign { var; rval } -> (
match extract_loads [] rval with
| [], _ -> ([], kind)
| loads, rval -> (loads, Assign { var; rval }))
| Load { var; base; dir; addr } -> (
match extract_loads [] addr with
| [], _ -> ([], kind)
| loads, addr -> (loads, Load { var; base; dir; addr }))
| Store { base; dir; addr; rval } -> (
let loads, addr = extract_loads [] addr in
match extract_loads loads rval with
| [], _ -> ([], kind)
| loads, rval -> (loads, Store { base; dir; addr; rval }))
| Assume test -> (
match extract_loads [] test with
| [], _ -> ([], kind)
| loads, test -> (loads, Assume test))
| Assert test -> (
match extract_loads [] test with
| [], _ -> ([], kind)
| loads, test -> (loads, Assert test))
let define_load t vertex =
match G.node t vertex with
| Fallthrough { kind; succ } -> (
match define_loads kind with
| [], kind' when kind == kind' -> ()
| loads, kind ->
add_node t vertex (Fallthrough { kind; succ });
List.fold_right
(fun ((_, dir, addr, base), var) () ->
ignore
(G.insert_before t vertex (Load { var; base; dir; addr }));
ignore (G.insert_before t succ (Forget var)))
loads ())
| Branch { test; target; fallthrough } -> (
match extract_loads [] test with
| [], _ -> ()
| loads, test ->
add_node t vertex (Branch { test; target; fallthrough });
List.fold_right
(fun ((_, dir, addr, base), var) () ->
ignore
(G.insert_before t vertex (Load { var; base; dir; addr }));
ignore (G.insert_before t target (Forget var));
ignore (G.insert_before t fallthrough (Forget var)))
loads ())
| Terminator (Jump { target; tag }) -> (
match extract_loads [] target with
| [], _ -> ()
| loads, target ->
add_node t vertex (Terminator (Jump { target; tag }));
List.fold_right
(fun ((_, dir, addr, base), var) () ->
ignore
(G.insert_before t vertex (Load { var; base; dir; addr })))
loads ())
| Goto _ | Terminator _ -> ()
let process t =
G.iter_new_vertex (define_load t) t;
Queue.iter (fun f -> f t) process_callback;
analyze t;
t.n <- I.Htbl.length t.nodes
let create ?(volatile = false) ?hooks ~task base reader size =
let vsize = size / 6 in
let t =
{
n = 0;
nodes = I.Htbl.create size;
preds = I.Htbl.create size;
entries = Virtual_address.Htbl.create vsize;
exits = I.Set.empty;
base;
reader;
size;
volatile;
last = None;
sinks = I.Set.empty;
killset = I.Htbl.create size;
task;
fibers = I.Htbl.create (size / 15);
}
in
let todo = ref Virtual_address.Map.empty in
Option.iter
(fun (hooks, env) ->
Virtual_address.Map.iter
(fun addr hooks ->
List.iter
(fun (anchor, script) ->
add_hook t todo addr anchor script env true)
hooks)
hooks)
hooks;
disasm t todo;
process t;
t
let raw_fiber (node : node) : [ `All ] Fiber.t =
match node with
| Fallthrough { kind = Nop; _ } -> Halt
| Fallthrough { kind = Debug msg; _ } -> Debug { msg; succ = Halt }
| Fallthrough { kind = Print output; _ } -> Print { output; succ = Halt }
| Fallthrough { kind = Hook { addr; _ }; _ } ->
Step { addr; n = 0; succ = Halt }
| Fallthrough { kind = Instruction inst; _ } ->
Step { addr = Instruction.address inst; n = 1; succ = Halt }
| Fallthrough { kind = Assign { var; rval }; _ } ->
Assign { var; rval; succ = Halt }
| Fallthrough { kind = Clobber var; _ } -> Clobber { var; succ = Halt }
| Fallthrough { kind = Forget _; _ } -> Halt
| Fallthrough { kind = Load { var; base; dir; addr }; _ } ->
Load { var; base; dir; addr; succ = Halt }
| Fallthrough { kind = Store { base; dir; addr; rval }; _ } ->
Store { base; dir; addr; rval; succ = Halt }
| Fallthrough { kind = Symbolize var; _ } -> Symbolize { var; succ = Halt }
| Fallthrough { kind = Assume test; _ } -> Assume { test; succ = Halt }
| Fallthrough { kind = Assert test; _ } -> Assert { test; succ = Halt }
| Fallthrough { kind = Enumerate { tid; enum; format; n }; _ } ->
Probe
{
kind = Enumerate { id = tid; enum; format; n; k = 0; values = [] };
succ = Halt;
}
| Fallthrough { kind = Reach { tid; n; guard; actions }; _ } ->
Probe { kind = Reach { id = tid; n; guard; actions }; succ = Halt }
| Fallthrough { kind = Builtin f; _ } ->
Builtin { f = resolve_builtin f !builtin_callback; succ = Halt }
| Goto { succ = Some _; _ } -> Halt
| Goto { target; succ = None; _ } -> Goto target
| Branch { test; _ } -> Branch { test; taken = Halt; fallthrough = Halt }
| Terminator (Jump { target; _ }) -> Jump target
| Terminator Halt -> Halt
| Terminator Cut -> Cut
| Terminator (Die msg) -> Die msg
let debug_level = Options.Logger.get_debug_level ()
let decorate_fiber =
if debug_level >= 40 then fun node ->
let succ = raw_fiber node in
(Fiber.Debug { msg = Format.asprintf "%a" pp_node node; succ }, succ)
else fun node ->
let fiber = raw_fiber node in
(fiber, fiber)
let make_label =
if debug_level >= 2 then (fun node pred ->
let msg =
match (node, !annotation_printer) with
| Instruction inst, Some pp ->
Format.asprintf "%a %-25s%a" Virtual_address.pp
(Instruction.address inst)
(Mnemonic.to_string (Instruction.mnemonic inst))
pp (Instruction.address inst)
| Hook { addr; info }, Some pp ->
Format.asprintf "%a %-25s%a" Virtual_address.pp addr info pp addr
| Instruction inst, None ->
Format.asprintf "%a %a" Virtual_address.pp
(Instruction.address inst) Mnemonic.pp
(Instruction.mnemonic inst)
| Hook { addr; info }, None ->
Format.asprintf "%a %s" Virtual_address.pp addr info
| _ -> assert false
in
let debug = Fiber.Debug { msg; succ = Halt } in
Fiber.relink ~pred debug;
debug)
else fun _ pred -> pred
let rec forward t vertex =
match G.node t vertex with
| Fallthrough { kind = Nop | Forget _; succ } | Goto { succ = Some succ; _ }
->
forward t succ
| Fallthrough
{
kind =
Assign { var; _ } | Clobber var | Load { var; _ } | Symbolize var;
succ;
}
when is_deadstore t var succ ->
forward t succ
| _ -> vertex
let link t todo reloc pred taken vertex =
let vertex = forward t vertex in
try Fiber.relink ~taken ~pred (I.Htbl.find t.fibers vertex)
with Not_found ->
Queue.push vertex todo;
Queue.push (pred, taken, vertex) reloc
let commit_addr addr n pred =
if n > 0 then (
let step = Fiber.Step { addr; n; succ = Halt } in
Fiber.relink ~pred
(if debug_level >= 39 then
Fiber.Debug { msg = Format.sprintf "step %d" n; succ = step }
else step);
step)
else pred
let commit_vars ?var ?deps vars pred =
let vars, others =
match deps with
| None -> (vars, Var.Map.empty)
| Some set ->
let f var _ = Var.Set.mem var set in
let f =
match var with
| None -> f
| Some var' ->
fun var rval ->
Option.fold ~none:false ~some:(Var.appears_in var') rval
|| f var rval
in
Var.Map.partition f vars
in
( others,
Var.Map.fold
(fun var value pred ->
let kind =
match value with
| None -> Clobber var
| Some rval -> Assign { var; rval }
in
let head, tail = decorate_fiber (Fallthrough { kind; succ = -1 }) in
Fiber.relink ~pred head;
tail)
vars pred )
let fallthrough_var = function
| Assign { var; _ }
| Load { var; _ }
| Clobber var
| Forget var
| Symbolize var ->
Some var
| Nop | Debug _ | Instruction _ | Hook _ | Assume _ | Assert _ | Enumerate _
| Store _ | Print _ | Reach _ | Builtin _ ->
None
let fallthrough_deps = function
| Nop | Debug _ | Instruction _ | Hook _ | Clobber _ | Forget _
| Symbolize _ ->
Some Var.Set.empty
| Assign { rval = e; _ }
| Load { addr = e; _ }
| Assume e
| Assert e
| Enumerate { enum = e; _ } ->
Some (Var.collect e Var.Set.empty)
| Store { addr; rval; _ } ->
Some (Var.collect addr (Var.collect rval Var.Set.empty))
| Print _ | Reach _ | Builtin _ -> None
let commit addr n vars pred = commit_addr addr n (snd (commit_vars vars pred))
let rec line t todo reloc addr n vars pred vertex =
try
let fiber = I.Htbl.find t.fibers vertex in
Fiber.relink ~pred:(commit addr n vars pred) fiber
with Not_found -> (
match G.pred t vertex with
| _ :: _ :: _ ->
Queue.push vertex todo;
Queue.push (commit addr n vars pred, false, vertex) reloc
| _ -> baseline t todo reloc addr n vars pred vertex)
and baseline t todo reloc addr n vars pred vertex =
let node = G.node t vertex in
match node with
| Fallthrough { kind = Nop | Forget _; succ } | Goto { succ = Some succ; _ }
->
line t todo reloc addr n vars pred succ
| Fallthrough { kind = Instruction inst as info; succ } ->
let pred = make_label info pred in
line t todo reloc (Instruction.address inst) (n + 1) vars pred succ
| Fallthrough { kind = Hook { addr; _ } as info; succ } ->
let pred = make_label info pred in
let step = Fiber.Step { addr; n; succ = Halt } in
Fiber.relink ~pred step;
line t todo reloc addr 0 vars step succ
| Fallthrough
{
kind =
Assign { var; _ } | Clobber var | Load { var; _ } | Symbolize var;
succ;
}
when is_deadstore t var succ ->
line t todo reloc addr n vars pred succ
| Fallthrough { kind = Assign { var; rval = Var var' }; succ }
when Var.Map.mem var' vars && is_deadstore t var' succ ->
let value = Var.Map.find var' vars in
let vars = Var.Map.remove var' vars in
let vars, pred = commit_vars ~var ~deps:Var.Set.empty vars pred in
line t todo reloc addr n (Var.Map.add var value vars) pred succ
| Fallthrough { kind = Assign { var; rval }; succ } ->
let vars, pred =
commit_vars ~var ~deps:(Var.collect rval Var.Set.empty) vars pred
in
line t todo reloc addr n (Var.Map.add var (Some rval) vars) pred succ
| Fallthrough { kind = Clobber var; succ } ->
let vars, pred = commit_vars ~var vars pred in
line t todo reloc addr n (Var.Map.add var None vars) pred succ
| Fallthrough
{
kind =
(Print _ | Assume _ | Assert _ | Enumerate _ | Reach _ | Builtin _)
as fallthrough;
succ;
} ->
let vars, pred =
commit_vars ?deps:(fallthrough_deps fallthrough) vars pred
in
let head, tail = decorate_fiber node in
Fiber.relink ~pred:(commit_addr addr n pred) head;
line t todo reloc addr 0 vars tail succ
| Fallthrough { kind; succ } ->
let vars, pred =
commit_vars ?var:(fallthrough_var kind) ?deps:(fallthrough_deps kind)
vars pred
in
let head, tail = decorate_fiber node in
Fiber.relink ~pred head;
line t todo reloc addr n vars tail succ
| Goto { succ = None; _ } | Terminator _ ->
Fiber.relink ~pred:(commit addr n vars pred) (fst (decorate_fiber node))
| Branch { target; fallthrough; _ } ->
let head, tail = decorate_fiber node in
Fiber.relink ~pred:(commit addr n vars pred) head;
link t todo reloc tail true target;
link t todo reloc tail false fallthrough
module Opt () = struct
module Env = Cse.Env
let commit_state t env pred vertex =
let env =
Var.Set.fold
(fun var env -> Env.forget var env)
(I.Htbl.find t.killset vertex)
env
in
List.fold_left
(fun pred kind ->
let head, tail = decorate_fiber (Fallthrough { kind; succ = 0 }) in
Fiber.relink ~pred head;
tail)
pred (Cse.commit env)
let commit t addr n env pred vertex =
commit_addr addr n (commit_state t env pred vertex)
let rec line t todo reloc addr n env pred vertex =
try
let fiber = I.Htbl.find t.fibers vertex in
Fiber.relink ~pred:(commit t addr n env pred vertex) fiber
with Not_found -> (
match G.pred t vertex with
| _ :: _ :: _ ->
Queue.push vertex todo;
Queue.push (commit t addr n env pred vertex, false, vertex) reloc
| _ -> baseline t todo reloc addr n env pred vertex)
and baseline t todo reloc addr n env pred vertex =
let node = G.node t vertex in
match node with
| Fallthrough { kind = Nop; succ } | Goto { succ = Some succ; _ } ->
line t todo reloc addr n env pred succ
| Fallthrough { kind = Instruction inst as info; succ } ->
let pred = make_label info pred in
line t todo reloc (Instruction.address inst) (n + 1) env pred succ
| Fallthrough { kind = Hook { addr; _ } as info; succ } ->
let pred = make_label info pred in
let step = Fiber.Step { addr; n; succ = Halt } in
Fiber.relink ~pred step;
line t todo reloc addr 0 env step succ
| Fallthrough
{
kind =
Assign { var; _ } | Clobber var | Load { var; _ } | Symbolize var;
succ;
}
when Var.Set.mem var (I.Htbl.find t.killset succ) ->
line t todo reloc addr n env pred succ
| Fallthrough { kind = Assign { var; rval }; succ } ->
line t todo reloc addr n (Env.assign var rval env) pred succ
| Fallthrough { kind = Clobber var; succ } ->
line t todo reloc addr n (Env.clobber var env) pred succ
| Fallthrough { kind = Forget var; succ } ->
line t todo reloc addr n (Env.forget var env) pred succ
| Fallthrough { kind = Load { var; base; dir; addr = ptr }; succ } ->
line t todo reloc addr n (Env.load var base dir ptr env) pred succ
| Fallthrough { kind = Store { base; dir; addr = ptr; rval }; succ } ->
line t todo reloc addr n
(Env.store base dir ~addr:ptr rval env)
pred succ
| Fallthrough { succ; _ } ->
let pred = commit_state t env pred vertex in
let head, tail = decorate_fiber node in
Fiber.relink ~pred head;
line t todo reloc addr n Env.empty tail succ
| Goto { succ = None; _ } | Terminator _ ->
Fiber.relink
~pred:(commit t addr n env pred vertex)
(fst (decorate_fiber node))
| Branch { test; target; fallthrough } ->
let node, target, fallthrough =
match test with
| Unary (Not, test) ->
( Branch { test; target = fallthrough; fallthrough = target },
fallthrough,
target )
| _ -> (node, target, fallthrough)
in
let head, tail = decorate_fiber node in
Fiber.relink ~pred:(commit t addr n env pred vertex) head;
link t todo reloc tail true target;
link t todo reloc tail false fallthrough
let run t todo reloc pred vertex =
baseline t todo reloc Virtual_address.zero 0 Env.empty pred vertex
end
let assemble =
if Options.Cse.get () then
let module O = Opt () in
fun t todo reloc pred vertex ->
if not t.volatile then O.run t todo reloc pred vertex
else
baseline t todo reloc Virtual_address.zero 0 Var.Map.empty pred vertex
else fun t todo reloc pred vertex ->
baseline t todo reloc Virtual_address.zero 0 Var.Map.empty pred vertex
let rec closure t todo reloc =
if Queue.is_empty todo then
Queue.iter
(fun (pred, taken, target) ->
Fiber.relink ~taken ~pred (I.Htbl.find t.fibers (forward t target)))
reloc
else
let vertex = Queue.pop todo in
let vertex = forward t vertex in
if I.Htbl.mem t.fibers vertex then closure t todo reloc;
let placeholder : [ `Assume ] Fiber.t =
Assume { test = Expr.one; succ = Halt }
in
assemble t todo reloc
(let (Assume _ as head) = placeholder in
head)
vertex;
let (Assume { succ; _ }) = placeholder in
I.Htbl.add t.fibers vertex succ;
closure t todo reloc
let rec get t addr =
match Virtual_address.Htbl.find t.entries addr with
| exception Not_found ->
disasm t (ref (Virtual_address.Map.singleton addr []));
process t;
get t addr
| vertex -> (
let vertex = forward t vertex in
try I.Htbl.find t.fibers vertex
with Not_found ->
let todo = Queue.create () in
Queue.add vertex todo;
closure t todo (Queue.create ());
I.Htbl.find t.fibers vertex)
let disasm t addr =
try Virtual_address.Htbl.find t.entries addr
with Not_found ->
disasm t (ref (Virtual_address.Map.singleton addr []));
process t;
Virtual_address.Htbl.find t.entries addr
let single ?hooks ~task addr reader size =
let hooks =
Option.map
(fun (hooks, env) -> (Virtual_address.Map.singleton addr hooks, env))
hooks
in
let t = create ~volatile:true ?hooks ~task addr reader size in
let fiber = get t addr in
(fiber, t.last)
let script ~task addr ?(fallthrough = false) script env =
let t =
{
n = 0;
nodes = I.Htbl.create 16;
preds = I.Htbl.create 16;
entries = Virtual_address.Htbl.create 1;
exits = I.Set.empty;
base = addr;
reader = Lreader.of_bytes "";
size = 0;
volatile = true;
last = None;
sinks = I.Set.empty;
killset = I.Htbl.create 16;
task;
fibers = I.Htbl.create 1;
}
in
add_node t 0
(Fallthrough { kind = Hook { addr; info = "anonymous" }; succ = 1 });
Virtual_address.Htbl.add t.entries addr 0;
add_script t (ref Virtual_address.Map.empty) addr script env fallthrough;
process t;
get t addr
end