Source file frontend.ml
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(** C front-end to translate parser AST into MOPSA AST *)
open Mopsa_c_parser
open C_AST
open Mopsa
open Universal.Ast
open Stubs.Ast
open Ast
let debug fmt = Debug.debug ~channel:"c.frontend" fmt
(** {2 Command-line options} *)
(** ======================== *)
let opt_clang = ref []
(** Extra options to pass to clang when parsing *)
let opt_include_dirs = ref []
(** List of include directories *)
let opt_make_target = ref ""
(** Name of the target binary to analyze *)
let opt_without_libc = ref false
(** Disable stubs of the standard library *)
let opt_enable_cache = ref true
(** Enable the parser cache. *)
let opt_warn_all = ref false
(** Display all compiler warnings *)
let opt_use_stub = ref []
(** Lists of functions that the body will be replaced by a stub *)
let opt_library_only = ref false
(** Allow library-only targets in the .db files (used for multilanguage analysis) *)
let opt_target_triple = ref ""
(** Target architecture triple to analyze for (host if left empty) *)
let opt_stubs_files = ref []
(** Additional stub files to parse *)
let opt_ignored_translation_units = ref []
(** List of translation units to ignore during linking *)
let opt_save_preprocessed_file = ref ""
(** Where to save the preprocessed file *)
let opt_store_project = ref true
(** Store project in memory for automated testcase reduction capabilities *)
let () =
register_language_option "c" {
key = "-I";
category = "C";
doc = " add the directory to the search path for include files in C analysis";
spec = String (ArgExt.set_string_list_lifter opt_include_dirs, ArgExt.empty);
default = "";
};
register_language_option "c" {
key = "-ccopt";
category = "C";
doc = " pass the option to the Clang frontend";
spec = String (ArgExt.set_string_list_lifter opt_clang, ArgExt.empty);
default = "";
};
register_language_option "c" {
key = "-make-target";
category = "C";
doc = " binary target to analyze; used only when the Makefile builds multiple targets.";
spec = Set_string (opt_make_target, ArgExt.empty);
default = "";
};
register_language_option "c" {
key = "-without-libc";
category = "C";
doc = " disable stubs of the standard C library.";
spec = Set opt_without_libc;
default = "false";
};
register_language_option "c" {
key = "-disable-parser-cache";
category = "C";
doc = " disable the cache of the Clang parser.";
spec = Clear opt_enable_cache;
default = "unset";
};
register_language_option "c" {
key = "-Wall";
category = "C";
doc = " display compiler warnings.";
spec = Set opt_warn_all;
default = "unset";
};
register_language_option "c" {
key = "-use-stub";
category = "C";
doc = " list of functions for which the stub is used instead of the declaration.";
spec = String (ArgExt.set_string_list_lifter opt_use_stub, ArgExt.empty);
default = "";
};
register_language_option "c" {
key = "-library-only";
category = "C";
doc = " allow library-only targets in the .db files (used for multilanguage analysis)";
spec = Set opt_library_only;
default = "false";
};
register_language_option "c" {
key = "-additional-stubs";
category = "C";
doc = " additional stubs file";
spec = String (ArgExt.set_string_list_lifter opt_stubs_files, ArgExt.empty);
default = "";
};
register_language_option "c" {
key = "-target-triple";
category = "C";
doc = " target architecture to analyze, as a triple (host if left empty).";
spec = Set_string (opt_target_triple, ArgExt.empty);
default = "";
};
register_language_option "c" {
key = "-c-ignore-translation-units";
category = "C";
doc = " list of translation units ignored during linking.";
spec = String (ArgExt.set_string_list_lifter opt_ignored_translation_units, ArgExt.empty);
default = "";
};
register_language_option "c" {
key = "-c-preprocess-and-exit";
category = "C";
doc = " save the whole analyzed project into a single preprocessed file passed as argument to this option; then exit";
spec = ArgExt.Set_string (opt_save_preprocessed_file, ArgExt.empty);
default = "";
};
register_language_option "c" {
key = "-c-no-project-storage";
category = "C";
doc = " do not keep the full project in memory (used for automated testcase reduction, but may consume memory)";
spec = ArgExt.Clear opt_store_project;
default = "";
};
()
(** {2 Contexts} *)
(** ============ *)
type type_space = TS_TYPEDEF | TS_RECORD | TS_ENUM
type ctx = {
ctx_prj : C_AST.project;
ctx_fun: Ast.c_fundec StringMap.t;
ctx_type: (type_space*string,typ) Hashtbl.t;
ctx_vars: (int*string,var*C_AST.variable) Hashtbl.t;
ctx_macros: C_AST.macro StringMap.t;
ctx_predicates: Mopsa_c_stubs_parser.Passes.Preprocessor.predicate StringMap.t;
ctx_stubs: (string,Mopsa_c_stubs_parser.Cst.stub) Hashtbl.t;
ctx_enums: Z.t StringMap.t;
}
let input_files : string list ref = ref []
(** List of input files *)
let target_info = ref host_target_info
(** Target information used for parsing *)
let o_prj : Mopsa_c_parser.C_AST.project option ref = ref None
(** Saved project *)
let find_function_in_context ctx range (f: C_AST.func) =
try StringMap.find f.func_unique_name ctx.ctx_fun
with Not_found -> Exceptions.panic_at range "Could not find function %s in context" f.func_unique_name
let (ctx:Clang_to_C.context) : string list =
let f = Filename.extension f = ".h" in
let f = is_header f && not (List.mem f !input_files) in
List.filter is_system_header (Clang_to_C.get_parsed_files ctx)
let get_all_stubs () =
let rec iter dir =
if not (Sys.is_directory dir) then []
else
Sys.readdir dir |>
Array.fold_left
(fun acc f ->
let ff = Filename.concat dir f in
if Sys.is_directory ff then iter ff @ acc else ff :: acc
) []
in
iter (Filename.concat (Params.Paths.get_lang_stubs_dir "c" ()) "libc")
let stubs =
let stubs_dir = Filename.concat (Params.Paths.get_lang_stubs_dir "c" ()) "libc" in
let stubd_dir_len = String.length stubs_dir in
List.filter (fun stub ->
let h = Filename.chop_extension stub ^ ".h" in
let relative_h = String.sub h stubd_dir_len (String.length h - stubd_dir_len) in
let regexp = Str.regexp (".*" ^ relative_h ^ "$") in
Str.string_match regexp header 0
) stubs
let is_ignored_translation_unit file =
let n = String.length file in
List.exists
(fun file' ->
let n' = String.length file' in
n >= n' && (String.equal file' (String.sub file (n - n') n'))
) !opt_ignored_translation_units
let save_preprocessed_file prj output_file =
let outch = open_out output_file in
let () = C_print.print_project ~verbose:false outch prj in
let () = close_out outch in
!opt_stubs_files @ List.filter
(fun f ->
Filename.check_suffix (Filename.dirname f) "share/mopsa/stubs/c/libc"
) prj.proj_files
(** {2 Entry point} *)
(** =============== *)
let rec parse_program (files: string list) =
let open Clang_parser in
let open Clang_to_C in
if !opt_save_preprocessed_file <> "" then Clang_to_C.simplify := false;
if files = [] then panic "no input file";
if !opt_target_triple <> "" then
target_info :=
get_target_info ({ Clang_AST.empty_target_options with target_triple = !opt_target_triple })
;
Mopsa_c_stubs_parser.Cst.target_info := !target_info;
let ctx = Clang_to_C.create_context "project" !target_info in
let nb = List.length files in
input_files := [];
let () =
try
ListExt.iteri
(fun i file ->
match file, Filename.extension file with
| _, (".c" | ".h" | ".i") -> parse_file "clang" ~nb:(i,nb) [] file false false ctx
| _, (".cpp" | ".cc" | ".c++") -> parse_file "clang++" ~nb:(i,nb) [] file false true ctx
| _, ".db" | ".db", _ -> parse_db file ctx
| _, x -> Exceptions.panic "unknown C extension %s" x
) files;
with Exceptions.SyntaxErrorList es ->
panic "Parsing error raised:@.%a" (Format.pp_print_list ~pp_sep:(fun fmt () -> Format.fprintf fmt "@.") (fun fmt (range, msg) -> Format.fprintf fmt "%a: %s" pp_range range msg)) es in
let () = parse_stubs ctx () in
let prj = Clang_to_C.link_project ctx in
if !opt_store_project then o_prj := Some prj;
let () =
if !opt_save_preprocessed_file <> "" then
let stub_files = save_preprocessed_file prj !opt_save_preprocessed_file in
let ppl = Format.pp_print_list
~pp_sep:(fun fmt () -> Format.fprintf fmt " ")
Format.pp_print_string in
let () = warn "Preprocessed file generated to %s." !opt_save_preprocessed_file in
let () =
if List.length stub_files > 0 then
warn "If you want to run Mopsa on this file, do not forget to keep libc stubs (%a), e.g@\n%a"
ppl stub_files
ppl (List.append
(List.filter (fun a ->
not @@ List.mem a files
&& not @@ String.starts_with ~prefix:"-make-target=" a
&& not @@ String.starts_with ~prefix:"-c-preprocess-and-exit=" a)
(Array.to_list Sys.argv))
(!opt_save_preprocessed_file::stub_files)
);
in
exit 0
in
{
prog_kind = from_project prj;
prog_range = mk_program_range files;
}
and parse_db (dbfile: string) ctx : unit =
if not (Sys.file_exists dbfile) then panic "file %s not found" dbfile;
let open Clang_parser in
let open Clang_to_C in
let open Mopsa_build_db in
let db = load_db dbfile in
let srcs =
if !opt_library_only then
let libs = get_libraries db in
let lib =
if List.length libs = 1 then List.hd libs
else if libs = [] then panic "no library in database"
else if !opt_make_target = "" then
panic "a target is required in a multi-library Makefile@.Possible targets:@\n@[%a@]"
(Format.pp_print_list ~pp_sep:(fun fmt () -> Format.fprintf fmt "@\n")
Format.pp_print_string)
libs
else
try find_target !opt_make_target libs
with Not_found ->
panic "library target %s not found" !opt_make_target
in
get_library_sources db lib
else
let execs = get_executables db in
let exec =
if List.length execs = 1
then List.hd execs
else if execs = []
then panic "no binary in database"
else if !opt_make_target = ""
then panic "a target is required in a multi-binary database, use the -make-target option.@\nPossible targets:@\n @[%a@]"
(Format.pp_print_list ~pp_sep:(fun fmt () -> Format.fprintf fmt "@\n") Format.pp_print_string)
execs
else
try find_target !opt_make_target execs
with Not_found ->
panic "binary target %s not found" !opt_make_target
in
get_executable_sources db exec in
let nb = List.length srcs in
input_files := [];
let cwd = Sys.getcwd() in
ListExt.iteri
(fun i src ->
match src.source_kind with
| SOURCE_C | SOURCE_CXX ->
let cmd = if src.source_kind = SOURCE_C then "clang" else "clang++" in
Sys.chdir src.source_cwd;
parse_file cmd ~nb:(i,nb) src.source_opts src.source_path !opt_enable_cache (src.source_kind=SOURCE_CXX) ctx;
| _ -> if !opt_warn_all then warn "ignoring file %s" src.source_path
) srcs;
Sys.chdir cwd
and parse_file (cmd: string) ?nb ?(stub=false) (opts: string list) (file: string) enable_cache ignore ctx =
if not (Sys.file_exists file) then panic "file %s not found" file;
debug "parsing file %s" file;
let opts = List.filter (fun x -> x != "-MT" && x != "-MD") opts in
let opts' = ("-I" ^ (Paths.resolve_stub "c" "mopsa")) ::
("-include" ^ "mopsa.h") ::
"-Wall" ::
"-Wno-error=incompatible-function-pointer-types" ::
"-Wno-error=implicit-function-declaration" ::
"-Qunused-arguments"::
(List.map (fun dir -> "-I" ^ dir) !opt_include_dirs) @
opts @
!opt_clang
in
input_files := file :: !input_files;
C_parser.parse_file cmd file opts' ~target_options:!target_info.target_options !opt_warn_all enable_cache stub (ignore || is_ignored_translation_unit file) ctx !opt_use_stub
and parse_stubs ctx () =
(** Add Mopsa stubs *)
parse_file ~stub:true "clang" [] (Params.Paths.resolve_stub "c" "mopsa/mopsa.c") false false ctx;
(** Add compiler builtins *)
parse_file ~stub:true "clang" [] (Params.Paths.resolve_stub "c" "mopsa/compiler_builtins.c") false false ctx;
List.iter (fun stub_file ->
try
parse_file ~stub:true "clang" [] (Filename.concat (Paths.get_stubs_dir ()) stub_file) false false ctx;
with SyntaxErrorList es ->
panic "Parsing error raised:@.%a" (Format.pp_print_list ~pp_sep:(fun fmt () -> Format.fprintf fmt "@.") (fun fmt (range, msg) -> Format.fprintf fmt "%a: %s" pp_range range msg)) es) !opt_stubs_files;
if !opt_without_libc then ()
else
(** Add stubs of the included headers *)
let = get_parsed_system_headers ctx in
if headers = [] then ()
else
let module Set = SetExt.StringSet in
let all_stubs = get_all_stubs () in
let rec iter past_stubs wq =
if Set.is_empty wq then ()
else
let h = Set.choose wq in
let wq' = Set.remove h wq in
if Set.mem h past_headers then
iter past_headers past_stubs wq'
else
let stubs = find_stubs_of_header h all_stubs in
let = List.fold_left (fun acc stub ->
if Set.mem stub past_stubs then acc
else
let before = Clang_to_C.get_parsed_files ctx |> Set.of_list in
parse_file ~stub:true "clang" [] stub false false ctx;
let after = Clang_to_C.get_parsed_files ctx |> Set.of_list in
Set.diff after before |>
Set.union acc
) Set.empty stubs
in
iter (Set.add h past_headers) (Set.union (Set.of_list stubs) past_stubs) (Set.union new_headers wq)
in
iter Set.empty Set.empty (Set.of_list headers)
and from_project prj =
let funcs_and_origins =
StringMap.bindings prj.proj_funcs |>
List.map snd |>
List.map(fun f -> from_function f, f)
in
let funcs = List.fold_left (fun map (f, o) ->
StringMap.add o.func_unique_name f map
) StringMap.empty funcs_and_origins
in
let ctx = {
ctx_fun = funcs;
ctx_type = Hashtbl.create 16;
ctx_prj = prj;
ctx_vars = Hashtbl.create 16;
ctx_macros = prj.proj_macros;
ctx_predicates = from_stub_predicates prj.proj_comments;
ctx_enums = StringMap.fold (fun _ enum acc ->
enum.enum_values |> List.fold_left (fun acc v ->
StringMap.add v.enum_val_org_name v.enum_val_value acc
) acc
) prj.proj_enums StringMap.empty;
ctx_stubs = Hashtbl.create 16;
}
in
List.iter (fun (f, o) ->
debug "parsing function %s" o.func_org_name;
f.c_func_uid <- o.func_uid;
f.c_func_org_name <- o.func_org_name;
f.c_func_unique_name <- o.func_unique_name;
f.c_func_return <- from_typ ctx o.func_return;
f.c_func_parameters <- Array.to_list o.func_parameters |> List.map (from_var ctx);
f.c_func_static_vars <- List.map (from_var ctx) o.func_static_vars;
f.c_func_local_vars <- List.map (from_var ctx) o.func_local_vars;
f.c_func_body <- from_body_option ctx (from_range o.func_range) o.func_body;
if f.c_func_body = None || List.mem f.c_func_org_name !opt_use_stub then
f.c_func_stub <- from_stub_comment ctx o
) funcs_and_origins;
let directives = from_stub_directives ctx prj.proj_comments in
let globals = StringMap.bindings prj.proj_vars |>
List.map snd |>
List.map (fun v ->
from_var ctx v, from_var_init ctx v
)
in
Ast.C_program {
c_globals = globals;
c_functions = StringMap.bindings funcs |> List.split |> snd;
c_stub_directives = directives;
}
and find_target target targets =
try
List.find (fun t -> String.equal (Filename.basename t) target) targets
with Not_found ->
let re_permissive = Str.regexp ("^" ^ target ^ ".*") in
let t = List.find (fun t -> Str.string_match re_permissive (Filename.basename t) 0) targets in
warn "permissive search selected target %s (initial target: %s)" t target;
t
(** {2 functions} *)
(** ============= *)
and from_function =
fun func ->
{
c_func_org_name = func.func_org_name;
c_func_unique_name = func.func_unique_name;
c_func_uid = func.func_uid;
c_func_is_static = func.func_is_static;
c_func_return = T_any;
c_func_parameters = [];
c_func_body = None ;
c_func_static_vars = [];
c_func_local_vars = [];
c_func_variadic = func.func_variadic;
c_func_stub = None;
c_func_range = from_range func.func_range;
c_func_name_range = from_range func.func_name_range;
}
(** {2 Scope update} *)
(** **************** *)
and from_scope_update ctx (upd:C_AST.scope_update) : Ast.c_scope_update =
{
c_scope_var_added = List.map (from_var ctx) upd.scope_var_added;
c_scope_var_removed = List.map (from_var ctx) upd.scope_var_removed;
}
(** {2 Statements} *)
(** ============== *)
and from_stmt ctx ((skind, range): C_AST.statement) : stmt =
let srange = from_range range in
let start_range = set_range_end srange (get_range_start srange) in
let end_range = set_range_start srange (get_range_end srange) in
let skind = match skind with
| C_AST.S_local_declaration v ->
let vv = from_var ctx v in
let init = from_init_option ctx v.var_init in
Ast.S_c_declaration (vv, init, from_var_scope ctx v.var_kind)
| C_AST.S_expression e -> Universal.Ast.S_expression (from_expr ctx e)
| C_AST.S_block block -> from_block ctx srange block |> Framework.Core.Ast.Stmt.skind
| C_AST.S_if (cond, body, orelse) -> Universal.Ast.S_if (from_expr ctx cond, from_block ctx end_range body, from_block ctx end_range orelse)
| C_AST.S_while (cond, body) -> Universal.Ast.S_while (from_expr ctx cond, from_block ctx end_range body)
| C_AST.S_do_while (body, cond) -> S_c_do_while (from_block ctx end_range body, from_expr ctx cond)
| C_AST.S_for (init, test, increm, body) -> S_c_for(from_block ctx start_range init, from_expr_option ctx test, from_expr_option ctx increm, from_block ctx end_range body)
| C_AST.S_jump (C_AST.S_goto (label, upd)) -> S_c_goto (label,from_scope_update ctx upd)
| C_AST.S_jump (C_AST.S_break upd) -> S_c_break (from_scope_update ctx upd)
| C_AST.S_jump (C_AST.S_continue upd) -> S_c_continue (from_scope_update ctx upd)
| C_AST.S_jump (C_AST.S_return (None, upd)) -> S_c_return (None,from_scope_update ctx upd)
| C_AST.S_jump (C_AST.S_return (Some e, upd)) -> S_c_return (Some (from_expr ctx e), from_scope_update ctx upd)
| C_AST.S_jump (C_AST.S_switch (cond, body)) -> Ast.S_c_switch (from_expr ctx cond, from_block ctx end_range body)
| C_AST.S_target(C_AST.S_case(es,upd)) ->
let es' = List.map (from_expr ctx) es in
let try_bundle_into_range es =
let efirst, estl = List.hd es, List.tl es in
let tfirst = etyp efirst in
match ekind efirst with
| E_constant (C_int first) ->
let rec process op acc l = match l with
| [] ->
if Z.equal acc first then None
else
if (Z.(first <= acc)) then
Some (mk_int_general_interval (ItvUtils.IntBound.Finite first) (ItvUtils.IntBound.Finite acc) efirst.erange)
else
Some (mk_int_general_interval (ItvUtils.IntBound.Finite acc) (ItvUtils.IntBound.Finite first) efirst.erange)
| {ekind = E_constant (C_int h); etyp = th} ::tl when Z.(h = (op acc one)) && compare_typ th tfirst = 0 ->
process op h tl
| hd :: tl ->
let () = debug "first=%a, acc=%s, hd=%a, skipping" pp_expr efirst (Z.to_string acc) pp_expr hd in
None
in
let oitv_increasing = process Z.add first estl in
if oitv_increasing = None then
process Z.sub first estl
else oitv_increasing
| _ -> None
in
begin match try_bundle_into_range es' with
| None ->
let () = debug "failed to bundle switch at range %a" pp_range srange in
S_c_switch_case(es', from_scope_update ctx upd)
| Some itv ->
let () = debug "bundled switch at range %a into %a" pp_range srange pp_expr itv in
S_c_switch_case([itv], from_scope_update ctx upd)
end
| C_AST.S_target(C_AST.S_default upd) -> S_c_switch_default (from_scope_update ctx upd)
| C_AST.S_target(C_AST.S_label l) -> Ast.S_c_label l
| C_AST.S_asm a -> Ast.S_c_asm (C_print.string_of_statement (skind,range))
in
{skind; srange}
and from_block ctx empty_range (block: C_AST.block) : stmt =
let block_range =
match block.blk_stmts with
| [] -> empty_range
| l ->
let _,first = ListExt.hd l in
let _,last = ListExt.last l in
mk_orig_range (get_range_start (from_range first)) (get_range_end (from_range last))
in
mk_block
(List.map (from_stmt ctx) block.blk_stmts)
~vars:(List.map (from_var ctx) block.blk_local_vars)
block_range
and from_body_option (ctx) empty_range (block: C_AST.block option) : stmt option =
match block with
| None -> None
| Some stmtl -> Some (from_block ctx empty_range stmtl)
(** {2 Expressions} *)
(** =============== *)
and from_expr ctx ((ekind, tc , range) : C_AST.expr) : expr =
let erange = from_range range in
let etyp = from_typ ctx tc in
let ekind =
match ekind with
| C_AST.E_integer_literal n -> Universal.Ast.(E_constant (C_int n))
| C_AST.E_float_literal f -> Universal.Ast.(E_constant (C_float (float_of_string f)))
| C_AST.E_character_literal (c, k) -> E_constant(Ast.C_c_character (c, from_character_kind k))
| C_AST.E_string_literal (s, k) -> Universal.Ast.(E_constant (C_c_string (s, from_character_kind k)))
| C_AST.E_variable v -> E_var (from_var ctx v, None)
| C_AST.E_function f -> Ast.E_c_function (find_function_in_context ctx erange f)
| C_AST.E_call (f, args) -> Universal.Ast.E_call(from_expr ctx f, Array.map (from_expr ctx) args |> Array.to_list)
| C_AST.E_unary (op, e) -> E_unop (from_unary_operator op etyp, from_expr ctx e)
| C_AST.E_binary (op, e1, e2) -> E_binop (from_binary_operator op etyp, from_expr ctx e1, from_expr ctx e2)
| C_AST.E_cast (e,C_AST.EXPLICIT) -> Ast.E_c_cast(from_expr ctx e, true)
| C_AST.E_cast (e,C_AST.IMPLICIT) -> Ast.E_c_cast(from_expr ctx e, false)
| C_AST.E_assign (lval, rval) -> Ast.E_c_assign(from_expr ctx lval, from_expr ctx rval)
| C_AST.E_address_of(e) -> Ast.E_c_address_of(from_expr ctx e)
| C_AST.E_deref(p) -> Ast.E_c_deref(from_expr ctx p)
| C_AST.E_array_subscript (a, i) -> Ast.E_c_array_subscript(from_expr ctx a, from_expr ctx i)
| C_AST.E_member_access (r, i, f) -> Ast.E_c_member_access(from_expr ctx r, i, f)
| C_AST.E_arrow_access (r, i, f) -> Ast.E_c_arrow_access(from_expr ctx r, i, f)
| C_AST.E_statement s -> Ast.E_c_statement (from_block ctx erange s)
| C_AST.E_predefined s -> Universal.Ast.(E_constant (C_c_string (s, Ast.C_char_ascii)))
| C_AST.E_var_args e -> Ast.E_c_var_args (from_expr ctx e)
| C_AST.E_conditional (cond,e1,e2) -> Ast.E_c_conditional(from_expr ctx cond, from_expr ctx e1, from_expr ctx e2)
| C_AST.E_binary_conditional (_,_) -> Exceptions.panic_at erange "E_binary_conditional not supported"
| C_AST.E_compound_assign (_,_,_,_,_) -> Exceptions.panic_at erange "E_compound_assign not supported"
| C_AST.E_comma (_,_) -> Exceptions.panic_at erange "E_comma not supported"
| C_AST.E_increment (_,_,_) -> Exceptions.panic_at erange "E_increment not supported"
| C_AST.E_compound_literal _ -> Exceptions.panic_at erange "E_compound_literal not supported"
| C_AST.E_atomic (op,e1,e2) ->
Ast.E_c_atomic (op, from_expr ctx e1, from_expr ctx e2)
| C_AST.E_convert_vector e ->
if !opt_warn_all then warn_at erange "__builtin_convertvector not supported";
(from_expr ctx e).ekind
| C_AST.E_vector_element (e,s) ->
if !opt_warn_all then warn_at erange "__builtin_vectorelement not supported";
(from_expr ctx e).ekind
| C_AST.E_shuffle_vector a ->
if !opt_warn_all then warn_at erange "__builtin_shufflevector not supported";
(from_expr ctx a.(0)).ekind
in
mk_expr ekind erange ~etyp
and from_expr_option ctx : C_AST.expr option -> expr option = function
| None -> None
| Some e -> Some (from_expr ctx e)
and from_unary_operator op t = match op with
| C_AST.NEG -> O_minus
| C_AST.BIT_NOT -> O_bit_invert
| C_AST.LOGICAL_NOT -> O_log_not
and from_binary_operator op t = match op with
| C_AST.O_arithmetic (C_AST.ADD) -> O_plus
| C_AST.O_arithmetic (C_AST.SUB) -> O_minus
| C_AST.O_arithmetic (C_AST.MUL) -> O_mult
| C_AST.O_arithmetic (C_AST.DIV) -> O_div
| C_AST.O_arithmetic (C_AST.MOD) -> O_mod
| C_AST.O_arithmetic (C_AST.LEFT_SHIFT) -> O_bit_lshift
| C_AST.O_arithmetic (C_AST.RIGHT_SHIFT) -> O_bit_rshift
| C_AST.O_arithmetic (C_AST.BIT_AND) -> O_bit_and
| C_AST.O_arithmetic (C_AST.BIT_OR) -> O_bit_or
| C_AST.O_arithmetic (C_AST.BIT_XOR) -> O_bit_xor
| C_AST.O_logical (C_AST.LESS) -> O_lt
| C_AST.O_logical (C_AST.LESS_EQUAL) -> O_le
| C_AST.O_logical (C_AST.GREATER) -> O_gt
| C_AST.O_logical (C_AST.GREATER_EQUAL) -> O_ge
| C_AST.O_logical (C_AST.EQUAL) -> O_eq
| C_AST.O_logical (C_AST.NOT_EQUAL) -> O_ne
| C_AST.O_logical (C_AST.LOGICAL_AND) -> Ast.O_c_and
| C_AST.O_logical (C_AST.LOGICAL_OR) -> Ast.O_c_or
and from_character_kind : C_AST.character_kind -> Ast.c_character_kind = function
| Clang_AST.Char_Ascii -> Ast.C_char_ascii
| Clang_AST.Char_Wide -> Ast.C_char_wide
| Clang_AST.Char_UTF8 -> Ast.C_char_utf8
| Clang_AST.Char_UTF16 -> Ast.C_char_utf16
| Clang_AST.Char_UTF32 -> Ast.C_char_utf8
| Clang_AST.Char_Unevaluated -> Ast.C_char_unevaluated
(** {2 Variables} *)
(** ============= *)
and from_var ctx (v: C_AST.variable) : var =
try Hashtbl.find ctx.ctx_vars (v.var_uid,v.var_unique_name) |> fst
with Not_found ->
let v' =
mkv
(v.var_org_name ^ ":" ^ (string_of_int v.var_uid))
(V_cvar {
cvar_orig_name = v.var_org_name;
cvar_uniq_name = v.var_unique_name;
cvar_scope = from_var_scope ctx v.var_kind;
cvar_range = from_range v.var_range;
cvar_uid = v.var_uid;
cvar_before_stmts = List.map (from_stmt ctx) v.var_before_stmts;
cvar_after_stmts = List.map (from_stmt ctx) v.var_after_stmts;
})
(from_typ ctx v.var_type)
in
let v'' = patch_array_parameters v' in
Hashtbl.add ctx.ctx_vars (v.var_uid,v.var_unique_name) (v'', v);
v''
and patch_array_parameters v =
if not (is_c_array_type v.vtyp) ||
not (is_c_function_parameter v)
then v
else
let t = under_array_type v.vtyp in
{ v with vtyp = T_c_pointer t }
and from_var_scope ctx = function
| C_AST.Variable_global -> Ast.Variable_global
| Variable_extern -> Variable_extern
| Variable_local f -> Variable_local (from_function f)
| C_AST.Variable_parameter f -> Variable_parameter (from_function f)
| C_AST.Variable_file_static tu -> Variable_file_static tu.tu_name
| C_AST.Variable_func_static f -> Variable_func_static (from_function f)
and from_var_init ctx v =
match v.var_init with
| Some i -> Some (from_init ctx i)
| None -> None
and from_init_option ctx init =
match init with
| Some i -> Some (from_init ctx i)
| None -> None
and from_init ctx init =
match init with
| I_init_expr e -> C_init_expr (from_expr ctx e)
| I_init_list(il, i) -> C_init_list (List.map (from_init ctx) il, from_init_option ctx i)
| I_init_implicit t -> C_init_implicit (from_typ ctx t)
(** {2 Types} *)
(** ========= *)
and from_typ ctx (tc: C_AST.type_qual) : typ =
let typ, qual = tc in
let typ' = from_unqual_typ ctx typ in
if qual.C_AST.qual_is_const then
T_c_qualified({c_qual_is_const = true; c_qual_is_restrict = false; c_qual_is_volatile = false}, typ')
else
typ'
and from_unqual_typ ctx (tc: C_AST.typ) : typ =
match tc with
| C_AST.T_void -> Ast.T_c_void
| C_AST.T_bool -> Ast.T_c_bool
| C_AST.T_integer t -> Ast.T_c_integer (from_integer_type t)
| C_AST.T_float t -> Ast.T_c_float (from_float_type t)
| C_AST.T_pointer t -> Ast.T_c_pointer (from_typ ctx t)
| C_AST.T_array (t,l) -> Ast.T_c_array (from_typ ctx t, from_array_length ctx l)
| C_AST.T_function None -> Ast.T_c_function None
| C_AST.T_function (Some t) -> Ast.T_c_function (Some (from_function_type ctx t))
| C_AST.T_builtin_fn -> Ast.T_c_builtin_fn
| C_AST.T_typedef t ->
if Hashtbl.mem ctx.ctx_type (TS_TYPEDEF,t.typedef_unique_name)
then Hashtbl.find ctx.ctx_type (TS_TYPEDEF,t.typedef_unique_name)
else
let x = {
c_typedef_org_name = t.typedef_org_name;
c_typedef_unique_name = t.typedef_unique_name;
c_typedef_def = Ast.T_c_void;
c_typedef_range = from_range t.typedef_range;
}
in
let y = Ast.T_c_typedef x in
Hashtbl.add ctx.ctx_type (TS_TYPEDEF,t.typedef_unique_name) y;
x.c_typedef_def <- from_typ ctx t.typedef_def;
y
| C_AST.T_record r ->
if Hashtbl.mem ctx.ctx_type (TS_RECORD,r.record_unique_name)
then Hashtbl.find ctx.ctx_type (TS_RECORD,r.record_unique_name)
else
let x = {
c_record_kind =
(match r.record_kind with C_AST.STRUCT -> C_struct | C_AST.UNION -> C_union);
c_record_org_name = r.record_org_name;
c_record_unique_name = r.record_unique_name;
c_record_defined = r.record_defined;
c_record_sizeof = r.record_sizeof;
c_record_alignof = r.record_alignof;
c_record_fields = [];
c_record_range = from_range r.record_range;
}
in
let y = Ast.T_c_record x in
Hashtbl.add ctx.ctx_type (TS_RECORD,r.record_unique_name) y;
x.c_record_fields <-
List.map
(fun f -> {
c_field_org_name = f.field_org_name;
c_field_name = f.field_name;
c_field_offset = f.field_offset;
c_field_bit_offset = f.field_bit_offset;
c_field_type = from_typ ctx f.field_type;
c_field_range = from_range f.field_range;
c_field_index = f.field_index;
})
(Array.to_list r.record_fields);
y
| C_AST.T_enum e ->
if Hashtbl.mem ctx.ctx_type (TS_ENUM,e.enum_unique_name)
then Hashtbl.find ctx.ctx_type (TS_ENUM,e.enum_unique_name)
else
let x =
Ast.T_c_enum {
c_enum_org_name = e.enum_org_name;
c_enum_unique_name = e.enum_unique_name;
c_enum_defined = e.enum_defined;
c_enum_values =
List.map
(fun v -> {
c_enum_val_org_name = v.enum_val_org_name;
c_enum_val_unique_name = v.enum_val_unique_name;
c_enum_val_value = v.enum_val_value;
c_enum_val_range = from_range v.enum_val_range;
}) e.enum_values;
c_enum_integer_type = from_integer_type (OptionExt.none_to_exn e.enum_integer_type);
c_enum_range = from_range e.enum_range;
}
in
Hashtbl.add ctx.ctx_type (TS_ENUM,e.enum_unique_name) x;
x
| C_AST.T_bitfield (t,n) -> Ast.T_c_bitfield (from_unqual_typ ctx t, n)
| C_AST.T_complex _ -> failwith "C_AST.T_complex not supported"
| C_AST.T_vector v ->
let t = from_typ ctx v.vector_type in
let len = Z.div (Z.of_int v.vector_size) (sizeof_type_in_target t !target_info) in
Ast.T_c_array (t, Ast.C_array_length_cst len)
| C_AST.T_unknown_builtin s -> Ast.T_c_unknown_builtin s
and from_integer_type : C_AST.integer_type -> Ast.c_integer_type = function
| C_AST.Char SIGNED -> Ast.C_signed_char
| C_AST.Char UNSIGNED -> Ast.C_unsigned_char
| C_AST.SIGNED_CHAR -> Ast.C_signed_char
| C_AST.UNSIGNED_CHAR -> Ast.C_unsigned_char
| C_AST.SIGNED_SHORT -> Ast.C_signed_short
| C_AST.UNSIGNED_SHORT -> Ast.C_unsigned_short
| C_AST.SIGNED_INT -> Ast.C_signed_int
| C_AST.UNSIGNED_INT -> Ast.C_unsigned_int
| C_AST.SIGNED_LONG -> Ast.C_signed_long
| C_AST.UNSIGNED_LONG -> Ast.C_unsigned_long
| C_AST.SIGNED_LONG_LONG -> Ast.C_signed_long_long
| C_AST.UNSIGNED_LONG_LONG -> Ast.C_unsigned_long_long
| C_AST.SIGNED_INT128 -> Ast.C_signed_int128
| C_AST.UNSIGNED_INT128 -> Ast.C_unsigned_int128
and from_float_type : C_AST.float_type -> Ast.c_float_type = function
| C_AST.FLOAT -> Ast.C_float
| C_AST.DOUBLE -> Ast.C_double
| C_AST.LONG_DOUBLE -> Ast.C_long_double
| C_AST.FLOAT128 -> Ast.C_float128
and from_array_length ctx al = match al with
| C_AST.No_length -> Ast.C_array_no_length
| C_AST.Length_cst n -> Ast.C_array_length_cst n
| C_AST.Length_expr e -> Ast.C_array_length_expr (from_expr ctx e)
and from_function_type ctx f =
{
c_ftype_return = from_typ ctx f.ftype_return;
c_ftype_params = List.map (from_typ ctx) f.ftype_params;
c_ftype_variadic = f.ftype_variadic;
}
and find_field_index t f =
try
match fst t with
| T_record {record_fields} ->
let field = Array.to_list record_fields |>
List.find (fun field -> field.field_org_name = f)
in
field.field_index
| T_typedef td -> find_field_index td.typedef_def f
| _ -> Exceptions.panic "find_field_index: called on a non-record type %s"
(C_print.string_of_type_qual t)
with
Not_found -> Exceptions.panic "find_field_index: field %s not found in type %s"
f (C_print.string_of_type_qual t)
and under_type t =
match fst t with
| T_pointer t' -> t'
| T_array(t', _) -> t'
| T_typedef td -> under_type td.typedef_def
| _ -> Exceptions.panic "under_type: unsupported type %s"
(C_print.string_of_type_qual t)
(** {2 Ranges and locations} *)
(** ======================== *)
and from_range (range:C_AST.range) =
let open Clang_AST in
let open Location in
mk_orig_range
{
pos_file = range.range_begin.loc_file;
pos_line = range.range_begin.loc_line;
pos_column = range.range_begin.loc_column;
}
{
pos_file = range.range_end.loc_file;
pos_line = range.range_end.loc_line;
pos_column = range.range_end.loc_column;
}
(** {2 Stubs annotations} *)
(** ===================== *)
and ctx f =
try
let stub = Mopsa_c_stubs_parser.Main.parse_function_comment f
ctx.ctx_prj
ctx.ctx_enums
ctx.ctx_predicates
ctx.ctx_stubs in
Some (from_stub_func ctx f stub)
with Mopsa_c_stubs_parser.Main.StubNotFound ->
None
and from_stub_func ctx f stub =
debug "parsing stub %s" f.func_org_name;
{
stub_func_name = stub.stub_name;
stub_func_params = List.map (from_var ctx) (Array.to_list f.func_parameters);
stub_func_body = List.map (from_stub_section ctx) stub.stub_body;
stub_func_range = stub.stub_range;
stub_func_locals = List.map (from_stub_local ctx) stub.stub_locals;
stub_func_assigns = List.map (from_stub_assigns ctx) stub.stub_assigns;
stub_func_return_type =
match f.func_return with
| (T_void, _) -> None
| t -> Some (from_typ ctx t);
}
and from_stub_section ctx section =
match section with
| S_leaf leaf -> S_leaf (from_stub_leaf ctx leaf)
| S_case case -> S_case (from_stub_case ctx case)
and from_stub_leaf ctx leaf =
match leaf with
| S_local local -> S_local (from_stub_local ctx local)
| S_assumes assumes -> S_assumes (from_stub_assumes ctx assumes)
| S_requires requires -> S_requires (from_stub_requires ctx requires)
| S_assigns assigns -> S_assigns (from_stub_assigns ctx assigns)
| S_ensures ensures -> S_ensures (from_stub_ensures ctx ensures)
| S_free free -> S_free (from_stub_free ctx free)
| S_message msg -> S_message (from_stub_message ctx msg)
and from_stub_case ctx case =
{
case_label = case.Mopsa_c_stubs_parser.Ast.case_label;
case_body = List.map (from_stub_leaf ctx) case.case_body;
case_locals = List.map (from_stub_local ctx) case.case_locals;
case_assigns = List.map (from_stub_assigns ctx) case.case_assigns;
case_range = case.case_range;
}
and from_stub_requires ctx req =
bind_range req @@ fun req ->
from_stub_formula ctx req
and from_stub_free ctx free =
bind_range free @@ fun free ->
from_stub_expr ctx free
and from_stub_message ctx msg =
bind_range msg @@ fun m ->
{ message_kind = from_stub_message_kind m.message_kind;
message_body = m.message_body; }
and from_stub_message_kind = function
| WARN -> WARN
| UNSOUND -> UNSOUND
and from_stub_assigns ctx assign =
bind_range assign @@ fun assign ->
{
assign_target = from_stub_expr ctx assign.assign_target;
assign_offset = List.map (from_stub_interval ctx) assign.assign_offset;
}
and from_stub_local ctx loc =
bind_range loc @@ fun loc ->
{ lvar = from_var ctx loc.lvar; lval = from_stub_local_value ctx loc.lval }
and from_stub_local_value ctx lval =
match lval with
| L_new res -> L_new res
| L_call (f, args) ->
let ff = find_function_in_context ctx f.range f.content in
let t = T_c_function (Some {
c_ftype_return = from_typ ctx f.content.func_return;
c_ftype_params = Array.to_list f.content.func_parameters |>
List.map (fun p -> from_typ ctx p.var_type);
c_ftype_variadic = f.content.func_variadic;
})
in
let fff = mk_expr (Ast.E_c_function ff) f.range ~etyp:t in
L_call (fff, List.map (from_stub_expr ctx) args)
and from_stub_ensures ctx ens =
bind_range ens @@ fun ens ->
from_stub_formula ctx ens
and from_stub_assumes ctx asm =
bind_range asm @@ fun asm ->
from_stub_formula ctx asm
and from_stub_formula ctx f =
bind_range f @@ function
| F_expr e -> F_expr (from_stub_expr ctx e)
| F_bool b -> F_expr (mk_bool b f.range)
| F_binop(op, f1, f2) -> F_binop(from_stub_log_binop op, from_stub_formula ctx f1, from_stub_formula ctx f2)
| F_not f -> F_not (from_stub_formula ctx f)
| F_forall (v, s, f) -> F_forall(from_var ctx v, from_stub_set ctx s, from_stub_formula ctx f)
| F_exists (v, s, f) -> F_exists(from_var ctx v, from_stub_set ctx s, from_stub_formula ctx f)
| F_in (v, s) -> F_in(from_stub_expr ctx v, from_stub_set ctx s)
| F_otherwise (f, e) -> F_otherwise(from_stub_formula ctx f, from_stub_expr ctx e)
| F_if (c, f1, f2) -> F_if(from_stub_formula ctx c, from_stub_formula ctx f1, from_stub_formula ctx f2)
and from_stub_set ctx s =
match s with
| S_interval i -> S_interval(from_stub_interval ctx i)
| S_resource r -> S_resource r
and from_stub_interval ctx i =
let lb = from_stub_expr ctx i.itv_lb in
let ub = from_stub_expr ctx i.itv_ub in
let lb = if i.itv_open_lb then (add lb one ~typ:T_int lb.erange) else lb in
let ub = if i.itv_open_ub then (sub ub one ~typ:T_int ub.erange) else ub in
(lb,ub)
and from_stub_expr ctx exp =
let bind_range_expr (exp:Mopsa_c_stubs_parser.Ast.expr with_range) f =
let ekind = f exp.content.kind
in mk_expr ekind exp.range ~etyp:(from_typ ctx exp.content.typ)
in
bind_range_expr exp @@ function
| E_top t -> E_constant (C_top (from_typ ctx t))
| E_int n -> E_constant (C_int n)
| E_float f -> E_constant (C_float f)
| E_string s -> E_constant (C_c_string (s, C_char_ascii))
| E_char c -> E_constant (C_c_character (Z.of_int c, Ast.C_char_ascii))
| E_invalid -> E_constant C_c_invalid
| E_var v -> E_var (from_var ctx v, None)
| E_unop (op, e) -> E_unop(from_stub_expr_unop op, from_stub_expr ctx e)
| E_binop (op, e1, e2) -> E_binop(from_stub_expr_binop op, from_stub_expr ctx e1, from_stub_expr ctx e2)
| E_addr_of e -> E_c_address_of(from_stub_expr ctx e)
| E_deref p -> E_c_deref(from_stub_expr ctx p)
| E_cast (t, explicit, e) -> E_c_cast(from_stub_expr ctx e, explicit)
| E_subscript (a, i) -> E_c_array_subscript(from_stub_expr ctx a, from_stub_expr ctx i)
| E_member (s, i, f) -> E_c_member_access(from_stub_expr ctx s, i, f)
| E_arrow (p, i, f) -> E_c_arrow_access(from_stub_expr ctx p, i, f)
| E_conditional(c, e1, e2) -> E_c_conditional(from_stub_expr ctx c, from_stub_expr ctx e1, from_stub_expr ctx e2)
| E_builtin_call (PRIMED, [arg]) -> E_stub_primed(from_stub_expr ctx arg)
| E_builtin_call (f, args) -> E_stub_builtin_call(f, List.map (from_stub_expr ctx) args)
| E_return -> E_stub_return
| E_raise s -> E_stub_raise s
and from_stub_log_binop = function
| AND -> AND
| OR -> OR
| IMPLIES -> IMPLIES
and from_stub_expr_binop = function
| Mopsa_c_stubs_parser.Cst.ADD -> O_plus
| SUB -> O_minus
| MUL -> O_mult
| DIV -> O_div
| MOD -> O_mod
| RSHIFT -> O_bit_rshift
| LSHIFT -> O_bit_lshift
| LOR -> O_c_and
| LAND -> O_c_or
| LT -> O_lt
| LE -> O_le
| GT -> O_gt
| GE -> O_ge
| EQ -> O_eq
| NEQ -> O_ne
| BOR -> O_bit_or
| BAND -> O_bit_and
| BXOR -> O_bit_xor
and from_stub_expr_unop = function
| Mopsa_c_stubs_parser.Cst.PLUS -> O_plus
| MINUS -> O_minus
| LNOT -> O_log_not
| BNOT -> O_bit_invert
and from_stub_directives ctx com_map =
C_AST.RangeMap.fold (fun range com acc ->
try
let stub = Mopsa_c_stubs_parser.Main.parse_directive_comment
com
range
ctx.ctx_prj
ctx.ctx_enums
ctx.ctx_predicates
ctx.ctx_stubs
in
from_stub_directive ctx stub :: acc
with Mopsa_c_stubs_parser.Main.StubNotFound -> acc
) com_map []
and from_stub_directive ctx stub =
{
stub_directive_body = List.map (from_stub_section ctx) stub.stub_body;
stub_directive_range = stub.stub_range;
stub_directive_locals = List.map (from_stub_local ctx) stub.stub_locals;
stub_directive_assigns = List.map (from_stub_assigns ctx) stub.stub_assigns;
}
and from_stub_predicates com_map =
C_AST.RangeMap.fold (fun range com acc ->
Mopsa_c_stubs_parser.Main.parse_predicates_comment com |>
List.fold_left
(fun acc pred ->
let name = pred.Mopsa_c_stubs_parser.Passes.Preprocessor.pred_name in
StringMap.add name pred acc
) acc
) com_map StringMap.empty
let on_panic exn files time =
match exn with
| Exceptions.Panic(msg, _) | Exceptions.PanicAtLocation(_, msg, _) | Exceptions.PanicAtFrame(_, _, msg, _) ->
let multiple_files = List.length
(List.filter (fun s ->
not @@ (try
let _ = Str.search_forward (Str.regexp "share/mopsa/stubs/c/") s 0 in
true
with Not_found -> false)) files) > 1
|| List.exists (fun f -> Filename.extension f = ".db") files in
if multiple_files && not !opt_store_project then
Format.printf "@\nTo benefit from Mopsa's automated testcase reduction capabilities, please remove command-line option `-c-no-project-storage`@\n"
else
let mopsa_command, stub_files, file_to_reduce =
let mopsa_command = Format.asprintf "%a" (Format.pp_print_list ~pp_sep:(fun fmt () -> Format.fprintf fmt " ") Format.pp_print_string) (List.filter (fun s -> not @@ List.mem s files) (Array.to_list Sys.argv)) in
match multiple_files, List.find_opt (String.ends_with ~suffix:".i") files with
| false, None ->
mopsa_command, [], List.hd files
| true, None ->
if Unix.isatty Unix.stdin && Unix.isatty Unix.stdout then
let () = Format.printf "@\n%a Do you want to try automated testcase reduction (using creduce/cvise) to find/report a minimal program that still crashes Mopsa? If yes, Mopsa will generate a preprocessed C file of your project. [Y/n]@."
(Debug.color_str Debug.magenta) "Mopsa encountered a fatal error."
in
let answer = input_line stdin in
if answer = "" || (String.lowercase_ascii answer).[0] = 'y' then
let preprocessed_file =
assert (!opt_make_target <> "");
!opt_make_target ^ ".i" in
let preprocessed_file =
if Sys.file_exists preprocessed_file then
Filename.basename @@ Filename.temp_file ~temp_dir:(Sys.getcwd ()) "" ".i"
else
preprocessed_file in
let stub_files = save_preprocessed_file (OptionExt.none_to_exn !o_prj) preprocessed_file in
mopsa_command, stub_files, preprocessed_file
else
exit 2
else
let () = Format.printf "@\n%a@\n"
(Debug.color_str Debug.magenta) "Hint: to get automated testcase reduction instructions, launch the analysis again in a TTY (without redirections, etc)." in
exit 2
| _, Some s ->
mopsa_command, List.filter (fun s ->
try
let _ = Str.search_forward (Str.regexp "share/mopsa/stubs/c/") s 0 in
true
with Not_found -> false) files, s
in
let timeout = int_of_float (5. +. 4. *. time) in
Format.printf "@\n%a using the following command (you may need to generalize a bit the MOPSA_ERR_STRING):@\nMOPSA_ERR_STRING=\"%s\" MOPSA_COMMAND=\"%s\" MOPSA_STUBS=\"%a\" FILE_TO_REDUCE=%s bash -c 'cvise --timeout %d %s $FILE_TO_REDUCE'@\n"
(Debug.color_str Debug.magenta) "Hint: try automated testcase reduction using creduce or cvise"
(String.escaped msg)
mopsa_command
(Format.pp_print_list ~pp_sep:(fun fmt () -> Format.fprintf fmt " ") Format.pp_print_string) stub_files
file_to_reduce
timeout
(!Paths.opt_share_dir ^ "/../../tools/reducer-oracle.sh")
| _ ->
()
let () =
register_frontend {
lang = "c";
parse = parse_program;
on_panic = on_panic;
}