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1629 lines
61 KiB
1629 lines
61 KiB
(*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*)
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(** Translate LLVM to LLAIR *)
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open Llair
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let pp_lltype fs t = Format.pp_print_string fs (Llvm.string_of_lltype t)
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(* WARNING: SLOW on instructions and functions *)
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let pp_llvalue fs t = Format.pp_print_string fs (Llvm.string_of_llvalue t)
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let pp_llblock fs t =
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Format.pp_print_string fs (Llvm.string_of_llvalue (Llvm.value_of_block t))
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;;
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Exp.demangle :=
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let open Ctypes in
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let cxa_demangle =
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(* char *__cxa_demangle(const char *, char *, size_t *, int * ) *)
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Foreign.foreign "__cxa_demangle"
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( string
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@-> ptr char
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@-> ptr size_t
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@-> ptr int
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@-> returning string_opt )
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in
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let null_ptr_char = from_voidp char null in
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let null_ptr_size_t = from_voidp size_t null in
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let status = allocate int 0 in
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fun mangled ->
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let demangled =
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cxa_demangle mangled null_ptr_char null_ptr_size_t status
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in
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if !@status = 0 then demangled else None
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exception Invalid_llvm of string
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let invalid_llvm : string -> 'a =
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fun msg ->
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let first_line =
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Option.map_or ~default:msg
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~f:(fun i -> String.take i msg)
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(String.index msg '\n')
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in
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Format.printf "@\n%s@\n" msg ;
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raise (Invalid_llvm first_line)
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(* gather names and debug locations *)
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module LlvalueTbl = HashTable.Make (struct
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type t = Llvm.llvalue
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include Poly
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end)
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module SymTbl = LlvalueTbl
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let sym_tbl : (string * Loc.t) SymTbl.t = SymTbl.create ~size:4_194_304 ()
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module ScopeTbl = HashTable.Make (struct
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type t = [`Fun of Llvm.llvalue | `Mod of Llvm.llmodule]
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include Poly
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end)
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let scope_tbl : (int ref * int String.Tbl.t) ScopeTbl.t =
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ScopeTbl.create ~size:32_768 ()
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open struct
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open struct
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let loc_of_global g =
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Loc.mk
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?dir:(Llvm.get_debug_loc_directory g)
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?file:(Llvm.get_debug_loc_filename g)
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~line:(Llvm.get_debug_loc_line g)
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?col:None
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let loc_of_function f =
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Loc.mk
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?dir:(Llvm.get_debug_loc_directory f)
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?file:(Llvm.get_debug_loc_filename f)
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~line:(Llvm.get_debug_loc_line f)
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?col:None
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let loc_of_instr i =
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Loc.mk
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?dir:(Llvm.get_debug_loc_directory i)
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?file:(Llvm.get_debug_loc_filename i)
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~line:(Llvm.get_debug_loc_line i)
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~col:(Llvm.get_debug_loc_column i)
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let add_sym llv loc =
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let maybe_scope =
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match Llvm.classify_value llv with
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| Argument -> Some (`Fun (Llvm.param_parent llv))
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| BasicBlock ->
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Some (`Fun (Llvm.block_parent (Llvm.block_of_value llv)))
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| Instruction _ ->
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Some (`Fun (Llvm.block_parent (Llvm.instr_parent llv)))
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| GlobalVariable | Function -> Some (`Mod (Llvm.global_parent llv))
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| UndefValue -> None
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| ConstantExpr -> None
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| ConstantPointerNull -> None
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| _ ->
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warn "Unexpected type of llv, might crash: %a" pp_llvalue llv () ;
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Some (`Mod (Llvm.global_parent llv))
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in
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match maybe_scope with
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| None -> ()
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| Some scope ->
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let next, void_tbl =
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ScopeTbl.find_or_add scope_tbl scope ~default:(fun () ->
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(ref 0, String.Tbl.create ()) )
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in
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let name =
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match Llvm.classify_type (Llvm.type_of llv) with
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| Void -> (
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let fname =
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match Llvm.classify_value llv with
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| Instruction (Call | Invoke) -> (
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match
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Llvm.value_name
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(Llvm.operand llv (Llvm.num_operands llv - 1))
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with
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| "" -> Int.to_string (!next - 1)
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| s -> s )
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| _ -> "void"
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in
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match String.Tbl.find void_tbl fname with
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| None ->
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String.Tbl.set void_tbl ~key:fname ~data:1 ;
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fname ^ ".void"
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| Some count ->
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String.Tbl.set void_tbl ~key:fname ~data:(count + 1) ;
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String.concat ~sep:""
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[fname; ".void."; Int.to_string count] )
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| _ -> (
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match Llvm.value_name llv with
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| "" ->
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(* anonymous values take the next SSA name *)
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let name = !next in
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next := name + 1 ;
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Int.to_string name
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| name -> (
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match Int.of_string name with
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| Some _ ->
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(* escape to avoid clash with names of anonymous values *)
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"\"" ^ name ^ "\""
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| None -> name ) )
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in
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SymTbl.set sym_tbl ~key:llv ~data:(name, loc)
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end
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let scan_names_and_locs : Llvm.llmodule -> unit =
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fun m ->
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let scan_global g = add_sym g (loc_of_global g) in
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let scan_instr i =
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let loc = loc_of_instr i in
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add_sym i loc ;
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match Llvm.instr_opcode i with
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| Call -> (
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match Llvm.(value_name (operand i (num_arg_operands i))) with
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| "llvm.dbg.declare" ->
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let md = Llvm.(get_mdnode_operands (operand i 0)) in
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if not (Array.is_empty md) then add_sym md.(0) loc
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else
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warn
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"could not find variable for debug info at %a with \
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metadata %a"
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Loc.pp loc (List.pp ", " pp_llvalue) (Array.to_list md) ()
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| _ -> () )
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| _ -> ()
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in
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let scan_block b =
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add_sym (Llvm.value_of_block b) Loc.none ;
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Llvm.iter_instrs scan_instr b
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in
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let scan_function f =
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Llvm.iter_params (fun prm -> add_sym prm Loc.none) f ;
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add_sym f (loc_of_function f) ;
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Llvm.iter_blocks scan_block f
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in
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Llvm.iter_globals scan_global m ;
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Llvm.iter_functions scan_function m
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let find_name : Llvm.llvalue -> string =
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fun v -> fst (SymTbl.find_exn sym_tbl v)
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let find_loc : Llvm.llvalue -> Loc.t =
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fun v -> snd (SymTbl.find_exn sym_tbl v)
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end
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let label_of_block : Llvm.llbasicblock -> string =
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fun blk -> find_name (Llvm.value_of_block blk)
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module LltypeTbl = HashTable.Make (struct
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type t = Llvm.lltype
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include Poly
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end)
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let anon_struct_name : string LltypeTbl.t = LltypeTbl.create ()
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let struct_name : Llvm.lltype -> string =
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fun llt ->
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match Llvm.struct_name llt with
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| Some name -> name
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| None ->
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LltypeTbl.find_or_add anon_struct_name llt ~default:(fun () ->
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Int.to_string (LltypeTbl.length anon_struct_name) )
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type x = {llcontext: Llvm.llcontext; lldatalayout: Llvm_target.DataLayout.t}
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let ptr_siz : x -> int =
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fun x -> Llvm_target.DataLayout.pointer_size x.lldatalayout
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let size_of, bit_size_of =
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let size_to_int size_of x llt =
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if Llvm.type_is_sized llt then
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match Int64.unsigned_to_int (size_of llt x.lldatalayout) with
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| Some n -> n
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| None -> todo "type size too large: %a" pp_lltype llt ()
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else todo "types with undetermined size: %a" pp_lltype llt ()
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in
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( size_to_int Llvm_target.DataLayout.abi_size
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, size_to_int Llvm_target.DataLayout.size_in_bits )
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let memo_type : Typ.t LltypeTbl.t = LltypeTbl.create ()
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let rec xlate_type : x -> Llvm.lltype -> Typ.t =
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fun x llt ->
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let xlate_type_ llt =
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if Llvm.type_is_sized llt then
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let byts = size_of x llt in
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let bits = bit_size_of x llt in
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match Llvm.classify_type llt with
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| Half | Float | Double | Fp128 -> Typ.float ~bits ~byts ~enc:`IEEE
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| X86fp80 -> Typ.float ~bits ~byts ~enc:`Extended
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| Ppc_fp128 -> Typ.float ~bits ~byts ~enc:`Pair
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| Integer -> Typ.integer ~bits ~byts
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| X86_mmx -> Typ.integer ~bits ~byts
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| Pointer ->
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if byts <> ptr_siz x then
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todo "non-integral pointer types: %a" pp_lltype llt () ;
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let elt = xlate_type x (Llvm.element_type llt) in
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Typ.pointer ~elt
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| Array ->
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let elt = xlate_type x (Llvm.element_type llt) in
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let len = Llvm.array_length llt in
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Typ.array ~elt ~len ~bits ~byts
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| Struct ->
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let llelts = Llvm.struct_element_types llt in
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let len = Array.length llelts in
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let fld_off i =
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match
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Int64.unsigned_to_int
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(Llvm_target.DataLayout.offset_of_element llt i
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x.lldatalayout)
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with
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| Some i -> i
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| None -> todo "offset too large: %a" pp_lltype llt ()
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in
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if Llvm.is_literal llt then
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let elts =
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IArray.mapi
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~f:(fun i elt -> (fld_off i, xlate_type x elt))
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(IArray.of_array llelts)
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in
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Typ.tuple elts ~bits ~byts
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else
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let name = struct_name llt in
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let elts =
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IArray.init len ~f:(fun i ->
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lazy (fld_off i, xlate_type x llelts.(i)) )
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in
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Typ.struct_ ~name elts ~bits ~byts
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| Function -> fail "expected to be unsized: %a" pp_lltype llt ()
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| Vector -> todo "vector types: %a" pp_lltype llt ()
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| Void | Label | Metadata | Token -> assert false
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else
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match Llvm.classify_type llt with
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| Function ->
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let return = xlate_type_opt x (Llvm.return_type llt) in
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let llargs = Llvm.param_types llt in
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let len = Array.length llargs in
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let args =
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IArray.init len ~f:(fun i -> xlate_type x llargs.(i))
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in
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Typ.function_ ~return ~args
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| Struct when Llvm.is_opaque llt -> Typ.opaque ~name:(struct_name llt)
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| Token -> Typ.opaque ~name:"token"
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| Vector | Array | Struct ->
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todo "unsized non-opaque aggregate types: %a" pp_lltype llt ()
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| Half | Float | Double | X86fp80 | Fp128 | Ppc_fp128 | Integer
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|X86_mmx | Pointer ->
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fail "expected to be sized: %a" pp_lltype llt ()
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| Void | Label | Metadata -> assert false
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in
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LltypeTbl.find_or_add memo_type llt ~default:(fun () ->
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[%Trace.call fun {pf} -> pf "%a" pp_lltype llt]
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;
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xlate_type_ llt
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|>
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[%Trace.retn fun {pf} ty ->
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pf "%a" Typ.pp_defn ty ;
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assert (
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(not (Llvm.type_is_sized llt))
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|| (not (Typ.is_sized ty))
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|| Typ.size_of ty = size_of x llt )] )
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and xlate_type_opt : x -> Llvm.lltype -> Typ.t option =
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fun x llt ->
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match Llvm.classify_type llt with
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| Void -> None
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| _ -> Some (xlate_type x llt)
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let i32 x = xlate_type x (Llvm.i32_type x.llcontext)
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let suffix_after_last_space : string -> string =
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fun str -> String.drop (String.rindex_exn str ' ' + 1) str
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let xlate_int : x -> Llvm.llvalue -> Exp.t =
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fun x llv ->
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let llt = Llvm.type_of llv in
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let typ = xlate_type x llt in
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let data =
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match Llvm.int64_of_const llv with
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| Some n -> Z.of_int64 n
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| None ->
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Z.of_string (suffix_after_last_space (Llvm.string_of_llvalue llv))
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in
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Exp.integer typ data
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let xlate_float : x -> Llvm.llvalue -> Exp.t =
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fun x llv ->
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let llt = Llvm.type_of llv in
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let typ = xlate_type x llt in
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let data = suffix_after_last_space (Llvm.string_of_llvalue llv) in
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Exp.float typ data
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let xlate_name x : Llvm.llvalue -> Reg.t =
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fun llv ->
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let typ = xlate_type x (Llvm.type_of llv) in
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Reg.mk typ (find_name llv)
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let xlate_name_opt : x -> Llvm.llvalue -> Reg.t option =
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fun x instr ->
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let llt = Llvm.type_of instr in
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match Llvm.classify_type llt with
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| Void -> None
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| _ -> Some (xlate_name x instr)
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let pp_prefix_exp fs (insts, exp) =
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Format.fprintf fs "@[%a%t%a@]" (List.pp "@ " Inst.pp) insts
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(fun fs -> if List.is_empty insts then () else Format.fprintf fs "@ ")
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Exp.pp exp
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(* per-function count of 'undef' values, used to translate each occurrence
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of 'undef' to a distinct register *)
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let undef_count = ref 0
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module ValTbl = HashTable.Make (struct
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type t = bool * Llvm.llvalue
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include Poly
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end)
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let memo_value : (Inst.t list * Exp.t) ValTbl.t = ValTbl.create ()
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module GlobTbl = LlvalueTbl
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let memo_global : GlobalDefn.t GlobTbl.t = GlobTbl.create ()
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let should_inline : Llvm.llvalue -> bool =
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fun llv ->
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match Llvm.use_begin llv with
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| Some use -> (
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match Llvm.use_succ use with
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| Some _ -> (
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match Llvm.classify_value llv with
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| Instruction
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( Trunc | ZExt | SExt | FPToUI | FPToSI | UIToFP | SIToFP
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| FPTrunc | FPExt | PtrToInt | IntToPtr | BitCast | AddrSpaceCast
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) ->
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true (* inline casts *)
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| _ -> false (* do not inline if >= 2 uses *) )
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| None -> true )
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| None -> true
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let ptr_fld x ~ptr ~fld ~lltyp =
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let offset =
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Llvm_target.DataLayout.offset_of_element lltyp fld x.lldatalayout
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in
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Exp.add ~typ:Typ.ptr ptr (Exp.integer Typ.siz (Z.of_int64 offset))
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let ptr_idx x ~ptr ~idx ~llelt =
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let stride = Llvm_target.DataLayout.abi_size llelt x.lldatalayout in
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Exp.add ~typ:Typ.ptr ptr
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(Exp.mul ~typ:Typ.siz (Exp.integer Typ.siz (Z.of_int64 stride)) idx)
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let convert_to_siz =
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let siz_bits = Typ.bit_size_of Typ.siz in
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fun typ arg ->
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match (typ : Typ.t) with
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| Integer {bits} ->
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if siz_bits < bits then Exp.signed siz_bits arg ~to_:Typ.siz
|
|
else if siz_bits > bits then Exp.signed bits arg ~to_:Typ.siz
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else arg
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| _ -> fail "convert_to_siz: %a" Typ.pp typ ()
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|
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let xlate_llvm_eh_typeid_for : x -> Typ.t -> Exp.t -> Exp.t =
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fun x typ arg -> Exp.convert typ ~to_:(i32 x) arg
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|
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let rec xlate_intrinsic_exp :
|
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string -> (x -> Llvm.llvalue -> Inst.t list * Exp.t) option =
|
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fun name ->
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match name with
|
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| "llvm.eh.typeid.for" ->
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Some
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(fun x llv ->
|
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let rand = Llvm.operand llv 0 in
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let pre, arg = xlate_value x rand in
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let src = xlate_type x (Llvm.type_of rand) in
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(pre, xlate_llvm_eh_typeid_for x src arg) )
|
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| _ -> None
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|
|
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and xlate_values x len val_i =
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let rec loop i (pre, args) =
|
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if i < 0 then (pre, args)
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|
else
|
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let pre_i, arg_i = xlate_value x (val_i i) in
|
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loop (i - 1) (pre_i @ pre, arg_i :: args)
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in
|
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loop (len - 1) ([], [])
|
|
|
|
and xlate_value ?(inline = false) : x -> Llvm.llvalue -> Inst.t list * Exp.t
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=
|
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fun x llv ->
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let xlate_value_ llv =
|
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match Llvm.classify_value llv with
|
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| Instruction Call -> (
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let func = Llvm.operand llv (Llvm.num_arg_operands llv) in
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let fname = Llvm.value_name func in
|
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match xlate_intrinsic_exp fname with
|
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| Some intrinsic when inline || should_inline llv -> intrinsic x llv
|
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| _ -> ([], Exp.reg (xlate_name x llv)) )
|
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| Instruction (Invoke | Alloca | Load | PHI | LandingPad | VAArg)
|
|
|Argument ->
|
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([], Exp.reg (xlate_name x llv))
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| Function ->
|
|
( []
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, Exp.function_
|
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(Function.mk (xlate_type x (Llvm.type_of llv)) (find_name llv))
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|
)
|
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| GlobalVariable -> ([], Exp.global (xlate_global x llv).name)
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| GlobalAlias -> xlate_value x (Llvm.operand llv 0)
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|
| ConstantInt -> ([], xlate_int x llv)
|
|
| ConstantFP -> ([], xlate_float x llv)
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|
| ConstantPointerNull -> ([], Exp.null)
|
|
| ConstantAggregateZero -> (
|
|
let typ = xlate_type x (Llvm.type_of llv) in
|
|
match typ with
|
|
| Integer _ -> ([], Exp.integer typ Z.zero)
|
|
| Pointer _ -> ([], Exp.null)
|
|
| Array _ | Tuple _ | Struct _ ->
|
|
([], Exp.splat typ (Exp.integer Typ.byt Z.zero))
|
|
| _ -> fail "ConstantAggregateZero of type %a" Typ.pp typ () )
|
|
| ConstantVector | ConstantArray ->
|
|
let typ = xlate_type x (Llvm.type_of llv) in
|
|
let len = Llvm.num_operands llv in
|
|
let pre, args = xlate_values x len (Llvm.operand llv) in
|
|
(pre, Exp.record typ (IArray.of_list args))
|
|
| ConstantDataVector ->
|
|
let typ = xlate_type x (Llvm.type_of llv) in
|
|
let len = Llvm.vector_size (Llvm.type_of llv) in
|
|
let pre, args = xlate_values x len (Llvm.const_element llv) in
|
|
(pre, Exp.record typ (IArray.of_list args))
|
|
| ConstantDataArray ->
|
|
let typ = xlate_type x (Llvm.type_of llv) in
|
|
let len = Llvm.array_length (Llvm.type_of llv) in
|
|
let pre, args = xlate_values x len (Llvm.const_element llv) in
|
|
(pre, Exp.record typ (IArray.of_list args))
|
|
| ConstantStruct ->
|
|
let typ = xlate_type x (Llvm.type_of llv) in
|
|
let len = Llvm.num_operands llv in
|
|
let pre, args = xlate_values x len (Llvm.operand llv) in
|
|
(pre, Exp.record typ (IArray.of_list args))
|
|
| BlockAddress ->
|
|
let parent = find_name (Llvm.operand llv 0) in
|
|
let name = find_name (Llvm.operand llv 1) in
|
|
([], Exp.label ~parent ~name)
|
|
| UndefValue ->
|
|
let llt = Llvm.type_of llv in
|
|
let typ = xlate_type x llt in
|
|
if not (Typ.is_sized typ) then
|
|
todo "types with undetermined size: %a" pp_lltype llt () ;
|
|
let name = Printf.sprintf "undef_%i" !undef_count in
|
|
let loc = Loc.none in
|
|
let reg = Reg.mk typ name in
|
|
let msg = Llvm.string_of_llvalue llv in
|
|
([Inst.nondet ~reg:(Some reg) ~msg ~loc], Exp.reg reg)
|
|
| Instruction
|
|
( ( Trunc | ZExt | SExt | FPToUI | FPToSI | UIToFP | SIToFP
|
|
| FPTrunc | FPExt | PtrToInt | IntToPtr | BitCast | AddrSpaceCast
|
|
| Add | FAdd | Sub | FSub | Mul | FMul | UDiv | SDiv | FDiv | URem
|
|
| SRem | FRem | Shl | LShr | AShr | And | Or | Xor | ICmp | FCmp
|
|
| Select | GetElementPtr | ExtractElement | InsertElement
|
|
| ShuffleVector | ExtractValue | InsertValue ) as opcode ) ->
|
|
if inline || should_inline llv then xlate_opcode x llv opcode
|
|
else ([], Exp.reg (xlate_name x llv))
|
|
| ConstantExpr -> xlate_opcode x llv (Llvm.constexpr_opcode llv)
|
|
| GlobalIFunc -> todo "ifuncs: %a" pp_llvalue llv ()
|
|
| Instruction (CatchPad | CleanupPad | CatchSwitch) ->
|
|
todo "windows exception handling: %a" pp_llvalue llv ()
|
|
| Instruction
|
|
( Invalid | Ret | Br | Switch | IndirectBr | Invalid2 | Unreachable
|
|
| Store | UserOp1 | UserOp2 | Fence | AtomicCmpXchg | AtomicRMW
|
|
| Resume | CleanupRet | CatchRet )
|
|
|NullValue | BasicBlock | InlineAsm | MDNode | MDString ->
|
|
fail "xlate_value: %a" pp_llvalue llv ()
|
|
in
|
|
ValTbl.find_or_add memo_value (inline, llv) ~default:(fun () ->
|
|
[%Trace.call fun {pf} -> pf "%a" pp_llvalue llv]
|
|
;
|
|
xlate_value_ llv
|
|
|>
|
|
[%Trace.retn fun {pf} -> pf "%a" pp_prefix_exp] )
|
|
|
|
and xlate_opcode : x -> Llvm.llvalue -> Llvm.Opcode.t -> Inst.t list * Exp.t
|
|
=
|
|
fun x llv opcode ->
|
|
[%Trace.call fun {pf} -> pf "%a" pp_llvalue llv]
|
|
;
|
|
let xlate_rand i = xlate_value x (Llvm.operand llv i) in
|
|
let typ = lazy (xlate_type x (Llvm.type_of llv)) in
|
|
let convert opcode =
|
|
let dst = Lazy.force typ in
|
|
let rand = Llvm.operand llv 0 in
|
|
let src = xlate_type x (Llvm.type_of rand) in
|
|
let pre, arg = xlate_value x rand in
|
|
( pre
|
|
, match (opcode : Llvm.Opcode.t) with
|
|
| Trunc -> Exp.signed (Typ.bit_size_of dst) arg ~to_:dst
|
|
| SExt -> Exp.signed (Typ.bit_size_of src) arg ~to_:dst
|
|
| ZExt -> Exp.unsigned (Typ.bit_size_of src) arg ~to_:dst
|
|
| (BitCast | AddrSpaceCast) when Typ.equal dst src -> arg
|
|
| FPToUI | FPToSI | UIToFP | SIToFP | FPTrunc | FPExt | PtrToInt
|
|
|IntToPtr | BitCast | AddrSpaceCast ->
|
|
Exp.convert src ~to_:dst arg
|
|
| _ -> fail "convert: %a" pp_llvalue llv () )
|
|
in
|
|
let binary (mk : ?typ:_ -> _) =
|
|
if Poly.equal (Llvm.classify_type (Llvm.type_of llv)) Vector then
|
|
todo "vector operations: %a" pp_llvalue llv () ;
|
|
let typ = xlate_type x (Llvm.type_of (Llvm.operand llv 0)) in
|
|
let pre_0, arg_0 = xlate_rand 0 in
|
|
let pre_1, arg_1 = xlate_rand 1 in
|
|
(pre_0 @ pre_1, mk ~typ arg_0 arg_1)
|
|
in
|
|
let unordered_or mk =
|
|
binary (fun ?typ e f ->
|
|
Exp.or_ ~typ:Typ.bool (Exp.uno ?typ e f) (mk ?typ e f) )
|
|
in
|
|
( match opcode with
|
|
| Trunc | ZExt | SExt | FPToUI | FPToSI | UIToFP | SIToFP | FPTrunc
|
|
|FPExt | PtrToInt | IntToPtr | BitCast | AddrSpaceCast ->
|
|
convert opcode
|
|
| ICmp -> (
|
|
match Option.get_exn (Llvm.icmp_predicate llv) with
|
|
| Eq -> binary Exp.eq
|
|
| Ne -> binary Exp.dq
|
|
| Sgt -> binary Exp.gt
|
|
| Sge -> binary Exp.ge
|
|
| Slt -> binary Exp.lt
|
|
| Sle -> binary Exp.le
|
|
| Ugt -> binary Exp.ugt
|
|
| Uge -> binary Exp.uge
|
|
| Ult -> binary Exp.ult
|
|
| Ule -> binary Exp.ule )
|
|
| FCmp -> (
|
|
match Llvm.fcmp_predicate llv with
|
|
| None | Some False -> binary (fun ?typ:_ _ _ -> Exp.false_)
|
|
| Some Oeq -> binary Exp.eq
|
|
| Some Ogt -> binary Exp.gt
|
|
| Some Oge -> binary Exp.ge
|
|
| Some Olt -> binary Exp.lt
|
|
| Some Ole -> binary Exp.le
|
|
| Some One -> binary Exp.dq
|
|
| Some Ord -> binary Exp.ord
|
|
| Some Uno -> binary Exp.uno
|
|
| Some Ueq -> unordered_or Exp.eq
|
|
| Some Ugt -> unordered_or Exp.gt
|
|
| Some Uge -> unordered_or Exp.ge
|
|
| Some Ult -> unordered_or Exp.lt
|
|
| Some Ule -> unordered_or Exp.le
|
|
| Some Une -> unordered_or Exp.dq
|
|
| Some True -> binary (fun ?typ:_ _ _ -> Exp.true_) )
|
|
| Add | FAdd -> binary Exp.add
|
|
| Sub | FSub -> binary Exp.sub
|
|
| Mul | FMul -> binary Exp.mul
|
|
| SDiv | FDiv -> binary Exp.div
|
|
| UDiv -> binary Exp.udiv
|
|
| SRem | FRem -> binary Exp.rem
|
|
| URem -> binary Exp.urem
|
|
| Shl -> binary Exp.shl
|
|
| LShr -> binary Exp.lshr
|
|
| AShr -> binary Exp.ashr
|
|
| And -> binary Exp.and_
|
|
| Or -> binary Exp.or_
|
|
| Xor -> binary Exp.xor
|
|
| Select ->
|
|
let typ = xlate_type x (Llvm.type_of (Llvm.operand llv 1)) in
|
|
let pre_0, cnd = xlate_rand 0 in
|
|
let pre_1, thn = xlate_rand 1 in
|
|
let pre_2, els = xlate_rand 2 in
|
|
(pre_0 @ pre_1 @ pre_2, Exp.conditional ~typ ~cnd ~thn ~els)
|
|
| ExtractElement | InsertElement -> (
|
|
let typ =
|
|
let lltyp = Llvm.type_of (Llvm.operand llv 0) in
|
|
let llelt = Llvm.element_type lltyp in
|
|
let elt = xlate_type x llelt in
|
|
let len = Llvm.vector_size llelt in
|
|
let byts = size_of x lltyp in
|
|
let bits = bit_size_of x lltyp in
|
|
Typ.array ~elt ~len ~bits ~byts
|
|
in
|
|
let idx i =
|
|
match xlate_rand i with
|
|
| pre, Integer {data} -> (pre, Z.to_int data)
|
|
| _ -> todo "vector operations: %a" pp_llvalue llv ()
|
|
in
|
|
let pre_0, rcd = xlate_rand 0 in
|
|
match opcode with
|
|
| ExtractElement ->
|
|
let pre_1, idx_1 = idx 1 in
|
|
(pre_0 @ pre_1, Exp.select typ rcd idx_1)
|
|
| InsertElement ->
|
|
let pre_1, elt = xlate_rand 1 in
|
|
let pre_2, idx_2 = idx 2 in
|
|
(pre_0 @ pre_1 @ pre_2, Exp.update typ ~rcd idx_2 ~elt)
|
|
| _ -> assert false )
|
|
| ExtractValue | InsertValue ->
|
|
let pre_0, agg = xlate_rand 0 in
|
|
let typ = xlate_type x (Llvm.type_of (Llvm.operand llv 0)) in
|
|
let indices = Llvm.indices llv in
|
|
let num = Array.length indices in
|
|
let rec xlate_indices pre0 i rcd typ =
|
|
let rcd_i, typ_i, upd =
|
|
match (typ : Typ.t) with
|
|
| Tuple {elts} | Struct {elts} ->
|
|
( Exp.select typ rcd indices.(i)
|
|
, snd (IArray.get elts indices.(i))
|
|
, Exp.update typ ~rcd indices.(i) )
|
|
| Array {elt} ->
|
|
( Exp.select typ rcd indices.(i)
|
|
, elt
|
|
, Exp.update typ ~rcd indices.(i) )
|
|
| _ -> fail "xlate_value: %a" pp_llvalue llv ()
|
|
in
|
|
let update_or_return elt ret =
|
|
match[@warning "p"] opcode with
|
|
| InsertValue ->
|
|
let pre, elt = Lazy.force elt in
|
|
(pre0 @ pre, upd ~elt)
|
|
| ExtractValue -> (pre0, ret)
|
|
in
|
|
if i < num - 1 then
|
|
let pre, elt = xlate_indices pre0 (i + 1) rcd_i typ_i in
|
|
update_or_return (lazy (pre, elt)) elt
|
|
else
|
|
let pre_elt = lazy (xlate_rand 1) in
|
|
update_or_return pre_elt rcd_i
|
|
in
|
|
xlate_indices pre_0 0 agg typ
|
|
| GetElementPtr ->
|
|
if Poly.equal (Llvm.classify_type (Llvm.type_of llv)) Vector then
|
|
todo "vector operations: %a" pp_llvalue llv () ;
|
|
let len = Llvm.num_operands llv in
|
|
assert (len > 0 || invalid_llvm (Llvm.string_of_llvalue llv)) ;
|
|
if len = 1 then convert BitCast
|
|
else
|
|
let rec xlate_indices i =
|
|
[%Trace.call fun {pf} ->
|
|
pf "%i %a" i pp_llvalue (Llvm.operand llv i)]
|
|
;
|
|
let pre_i, arg_i = xlate_rand i in
|
|
let idx =
|
|
convert_to_siz
|
|
(xlate_type x (Llvm.type_of (Llvm.operand llv i)))
|
|
arg_i
|
|
in
|
|
( if i = 1 then
|
|
let pre_0, base = xlate_rand 0 in
|
|
let lltyp = Llvm.type_of (Llvm.operand llv 0) in
|
|
let llelt =
|
|
match Llvm.classify_type lltyp with
|
|
| Pointer -> Llvm.element_type lltyp
|
|
| _ -> fail "xlate_opcode: %i %a" i pp_llvalue llv ()
|
|
in
|
|
(* translate [gep t*, iN M] as [gep [1 x t]*, iN M] *)
|
|
((pre_0 @ pre_i, ptr_idx x ~ptr:base ~idx ~llelt), llelt)
|
|
else
|
|
let (pre_i1, ptr), lltyp = xlate_indices (i - 1) in
|
|
match Llvm.classify_type lltyp with
|
|
| Array | Vector ->
|
|
let llelt = Llvm.element_type lltyp in
|
|
((pre_i1 @ pre_i, ptr_idx x ~ptr ~idx ~llelt), llelt)
|
|
| Struct ->
|
|
let fld =
|
|
match
|
|
Option.bind ~f:Int64.unsigned_to_int
|
|
(Llvm.int64_of_const (Llvm.operand llv i))
|
|
with
|
|
| Some n -> n
|
|
| None -> fail "xlate_opcode: %i %a" i pp_llvalue llv ()
|
|
in
|
|
let llelt = (Llvm.struct_element_types lltyp).(fld) in
|
|
((pre_i1 @ pre_i, ptr_fld x ~ptr ~fld ~lltyp), llelt)
|
|
| _ -> fail "xlate_opcode: %i %a" i pp_llvalue llv () )
|
|
|>
|
|
[%Trace.retn fun {pf} (pre_exp, llt) ->
|
|
pf "%a %a" pp_prefix_exp pre_exp pp_lltype llt]
|
|
in
|
|
fst (xlate_indices (len - 1))
|
|
| ShuffleVector -> (
|
|
(* translate shufflevector <N x t> %x, _, <N x i32> zeroinitializer to
|
|
%x *)
|
|
let exp = xlate_value x (Llvm.operand llv 0) in
|
|
let exp_typ = xlate_type x (Llvm.type_of (Llvm.operand llv 0)) in
|
|
let llmask = Llvm.operand llv 2 in
|
|
let mask_typ = xlate_type x (Llvm.type_of llmask) in
|
|
match (exp_typ, mask_typ) with
|
|
| Array {len= m}, Array {len= n} when m = n && Llvm.is_null llmask ->
|
|
exp
|
|
| _ -> todo "vector operations: %a" pp_llvalue llv () )
|
|
| Invalid | Ret | Br | Switch | IndirectBr | Invoke | Invalid2
|
|
|Unreachable | Alloca | Load | Store | PHI | Call | UserOp1 | UserOp2
|
|
|Fence | AtomicCmpXchg | AtomicRMW | Resume | LandingPad | CleanupRet
|
|
|CatchRet | CatchPad | CleanupPad | CatchSwitch | VAArg ->
|
|
fail "xlate_opcode: %a" pp_llvalue llv () )
|
|
|>
|
|
[%Trace.retn fun {pf} -> pf "%a" pp_prefix_exp]
|
|
|
|
and xlate_global : x -> Llvm.llvalue -> GlobalDefn.t =
|
|
fun x llg ->
|
|
GlobTbl.find_or_add memo_global llg ~default:(fun () ->
|
|
[%Trace.call fun {pf} -> pf "%a" pp_llvalue llg]
|
|
;
|
|
let g = Global.mk (xlate_type x (Llvm.type_of llg)) (find_name llg) in
|
|
let loc = find_loc llg in
|
|
(* add to tbl without initializer in case of recursive occurrences in
|
|
its own initializer *)
|
|
GlobTbl.set memo_global ~key:llg ~data:(GlobalDefn.mk g loc) ;
|
|
let init =
|
|
match Llvm.classify_value llg with
|
|
| GlobalVariable ->
|
|
Option.map (Llvm.global_initializer llg) ~f:(fun llv ->
|
|
let pre, init = xlate_value x llv in
|
|
(* Nondet insts to set up globals can be dropped to simply
|
|
leave the undef regs unconstrained. Other insts to set up
|
|
globals are currently not supported *)
|
|
let is_nondet = function Nondet _ -> true | _ -> false in
|
|
if not (List.for_all ~f:is_nondet pre) then
|
|
todo "global initializer instructions" () ;
|
|
(init, size_of x (Llvm.type_of llv)) )
|
|
| _ -> None
|
|
in
|
|
GlobalDefn.mk ?init g loc
|
|
|>
|
|
[%Trace.retn fun {pf} -> pf "%a" GlobalDefn.pp] )
|
|
|
|
type pop_thunk = Loc.t -> Llair.inst list
|
|
|
|
let pop_stack_frame_of_function :
|
|
x -> Llvm.llvalue -> Llvm.llbasicblock -> pop_thunk =
|
|
fun x func entry_blk ->
|
|
let append_stack_regs blk regs =
|
|
Llvm.fold_right_instrs
|
|
(fun instr regs ->
|
|
match Llvm.instr_opcode instr with
|
|
| Alloca -> xlate_name x instr :: regs
|
|
| _ -> regs )
|
|
blk regs
|
|
in
|
|
let entry_regs = append_stack_regs entry_blk [] in
|
|
Llvm.iter_blocks
|
|
(fun blk ->
|
|
if not (Poly.equal entry_blk blk) then
|
|
Llvm.iter_instrs
|
|
(fun instr ->
|
|
match Llvm.instr_opcode instr with
|
|
| Alloca ->
|
|
warn "stack allocation after function entry:@ %a" Loc.pp
|
|
(find_loc instr) ()
|
|
| _ -> () )
|
|
blk )
|
|
func ;
|
|
let pop retn_loc =
|
|
List.map entry_regs ~f:(fun reg ->
|
|
Inst.free ~ptr:(Exp.reg reg) ~loc:retn_loc )
|
|
in
|
|
pop
|
|
|
|
(** construct the types involved in landingpads: i32, std::type_info*, and
|
|
__cxa_exception *)
|
|
let landingpad_typs : x -> Llvm.llvalue -> Typ.t * Typ.t * Llvm.lltype =
|
|
fun x instr ->
|
|
let llt = Llvm.type_of instr in
|
|
let i32 = i32 x in
|
|
if
|
|
not
|
|
( Poly.(Llvm.classify_type llt = Struct)
|
|
&&
|
|
let llelts = Llvm.struct_element_types llt in
|
|
Array.length llelts = 2
|
|
&& Poly.(llelts.(0) = Llvm.pointer_type (Llvm.i8_type x.llcontext))
|
|
&& Poly.(llelts.(1) = Llvm.i32_type x.llcontext) )
|
|
then
|
|
todo "landingpad of type other than {i8*, i32}: %a" pp_llvalue instr () ;
|
|
let llcontext =
|
|
Llvm.(
|
|
module_context (global_parent (block_parent (instr_parent instr))))
|
|
in
|
|
let llpi8 = Llvm.(pointer_type (integer_type llcontext 8)) in
|
|
let ti = Llvm.(named_struct_type llcontext "class.std::type_info") in
|
|
let tip = Llvm.pointer_type ti in
|
|
let void = Llvm.void_type llcontext in
|
|
let dtor = Llvm.(pointer_type (function_type void [|llpi8|])) in
|
|
let cxa_exception = Llvm.struct_type llcontext [|tip; dtor|] in
|
|
(i32, xlate_type x tip, cxa_exception)
|
|
|
|
let exception_typs =
|
|
let pi8 = Typ.pointer ~elt:Typ.byt in
|
|
let i32 = Typ.integer ~bits:32 ~byts:4 in
|
|
let exc =
|
|
Typ.tuple (IArray.of_array [|(0, pi8); (8, i32)|]) ~bits:96 ~byts:12
|
|
in
|
|
(pi8, i32, exc)
|
|
|
|
(** Translate a control transfer from instruction [instr] to block [dst] to
|
|
a jump, if necessary by extending [blocks] with a trampoline containing
|
|
the PHIs of [dst] translated to a move. *)
|
|
let xlate_jump :
|
|
x
|
|
-> ?reg_exps:(Reg.t * (Inst.t list * Exp.t)) list
|
|
-> Llvm.llvalue
|
|
-> Llvm.llbasicblock
|
|
-> Loc.t
|
|
-> Llair.block list
|
|
-> Inst.t list * Llair.jump * Llair.block list =
|
|
fun x ?(reg_exps = []) instr dst loc blocks ->
|
|
let src = Llvm.instr_parent instr in
|
|
let rec xlate_jump_ reg_exps (pos : _ Llvm.llpos) =
|
|
match pos with
|
|
| Before dst_instr -> (
|
|
match Llvm.instr_opcode dst_instr with
|
|
| PHI ->
|
|
let reg_exp =
|
|
List.find_map_exn (Llvm.incoming dst_instr)
|
|
~f:(fun (arg, pred) ->
|
|
if Poly.equal pred src then
|
|
Some (xlate_name x dst_instr, xlate_value x arg)
|
|
else None )
|
|
in
|
|
xlate_jump_ (reg_exp :: reg_exps) (Llvm.instr_succ dst_instr)
|
|
| _ -> reg_exps )
|
|
| At_end blk -> fail "xlate_jump: %a" pp_llblock blk ()
|
|
in
|
|
let dst_lbl = label_of_block dst in
|
|
let jmp = Jump.mk dst_lbl in
|
|
match xlate_jump_ reg_exps (Llvm.instr_begin dst) with
|
|
| [] -> ([], jmp, blocks)
|
|
| rev_reg_pre_exps ->
|
|
let rev_reg_exps, rev_pre =
|
|
List.fold_map rev_reg_pre_exps []
|
|
~f:(fun (reg, (pre, exp)) rev_pre ->
|
|
((reg, exp), List.rev_append pre rev_pre) )
|
|
in
|
|
let mov =
|
|
Inst.move ~reg_exps:(IArray.of_list_rev rev_reg_exps) ~loc
|
|
in
|
|
let lbl = find_name instr ^ ".jmp." ^ dst_lbl in
|
|
let blk =
|
|
Block.mk ~lbl
|
|
~cmnd:(IArray.of_array [|mov|])
|
|
~term:(Term.goto ~dst:jmp ~loc)
|
|
in
|
|
let blocks =
|
|
match List.find blocks ~f:(fun b -> String.equal lbl b.lbl) with
|
|
| None -> blk :: blocks
|
|
| Some blk0 ->
|
|
assert (Block.equal blk0 blk) ;
|
|
blocks
|
|
in
|
|
(List.rev rev_pre, Jump.mk lbl, blocks)
|
|
|
|
(** An LLVM instruction is translated to a sequence of LLAIR instructions
|
|
and a terminator, plus some additional blocks to which it may refer
|
|
(that is, essentially a function body). These are needed since LLVM and
|
|
LLAIR blocks are not in 1:1 correspondence. *)
|
|
type code = Llair.inst list * Llair.term * Llair.block list
|
|
|
|
let pp_code fs (insts, term, blocks) =
|
|
Format.fprintf fs "@[<hv>@,@[%a%t@]%t@[<hv>%a@]@]" (List.pp "@ " Inst.pp)
|
|
insts
|
|
(fun fs ->
|
|
match term with
|
|
| Unreachable -> ()
|
|
| _ ->
|
|
Format.fprintf fs "%t%a"
|
|
(fun fs ->
|
|
if List.is_empty insts then () else Format.fprintf fs "@ " )
|
|
Term.pp term )
|
|
(fun fs -> if List.is_empty blocks then () else Format.fprintf fs "@\n")
|
|
(List.pp "@ " Block.pp) blocks
|
|
|
|
let rec xlate_func_name x llv =
|
|
match Llvm.classify_value llv with
|
|
| Function ->
|
|
( []
|
|
, Exp.function_
|
|
(Function.mk (xlate_type x (Llvm.type_of llv)) (find_name llv)) )
|
|
| GlobalVariable -> ([], Exp.global (xlate_global x llv).name)
|
|
| ConstantExpr -> xlate_opcode x llv (Llvm.constexpr_opcode llv)
|
|
| Argument | Instruction _ -> xlate_value x llv
|
|
| GlobalAlias -> xlate_func_name x (Llvm.operand llv 0)
|
|
| GlobalIFunc -> todo "ifunc: %a" pp_llvalue llv ()
|
|
| InlineAsm -> todo "inline asm: %a" pp_llvalue llv ()
|
|
| ConstantPointerNull -> todo "call null: %a" pp_llvalue llv ()
|
|
| _ -> todo "function kind in %a" pp_llvalue llv ()
|
|
|
|
module StringS = HashSet.Make (String)
|
|
|
|
let ignored_callees = StringS.create 0
|
|
|
|
let xlate_size_of x llv =
|
|
Exp.integer Typ.siz (Z.of_int (size_of x (Llvm.type_of llv)))
|
|
|
|
let xlate_instr :
|
|
pop_thunk
|
|
-> x
|
|
-> Llvm.llvalue
|
|
-> ((Llair.inst list * Llair.term -> code) -> code)
|
|
-> code =
|
|
fun pop x instr continue ->
|
|
[%Trace.call fun {pf} -> pf "%a" pp_llvalue instr]
|
|
;
|
|
let continue insts_term_to_code =
|
|
[%Trace.retn
|
|
fun {pf} () ->
|
|
pf "%a" pp_code (insts_term_to_code ([], Term.unreachable))]
|
|
() ;
|
|
continue insts_term_to_code
|
|
in
|
|
let nop () = continue (fun (insts, term) -> (insts, term, [])) in
|
|
let emit_inst ?(prefix = []) inst =
|
|
continue (fun (insts, term) -> (prefix @ (inst :: insts), term, []))
|
|
in
|
|
let emit_term ?(prefix = []) ?(blocks = []) term =
|
|
[%Trace.retn fun {pf} () -> pf "%a" pp_code (prefix, term, blocks)] () ;
|
|
(prefix, term, blocks)
|
|
in
|
|
let name = find_name instr in
|
|
let loc = find_loc instr in
|
|
let inline_or_move xlate =
|
|
if should_inline instr then nop ()
|
|
else
|
|
let reg = xlate_name x instr in
|
|
let prefix, exp = xlate instr in
|
|
let reg_exps = IArray.of_array [|(reg, exp)|] in
|
|
emit_inst ~prefix (Inst.move ~reg_exps ~loc)
|
|
in
|
|
let opcode = Llvm.instr_opcode instr in
|
|
match opcode with
|
|
| Load ->
|
|
let reg = xlate_name x instr in
|
|
let len = xlate_size_of x instr in
|
|
let prefix, ptr = xlate_value x (Llvm.operand instr 0) in
|
|
emit_inst ~prefix (Inst.load ~reg ~ptr ~len ~loc)
|
|
| Store ->
|
|
let rand0 = Llvm.operand instr 0 in
|
|
let pre0, exp = xlate_value x rand0 in
|
|
let len = xlate_size_of x rand0 in
|
|
let pre1, ptr = xlate_value x (Llvm.operand instr 1) in
|
|
emit_inst ~prefix:(pre0 @ pre1) (Inst.store ~ptr ~exp ~len ~loc)
|
|
| Alloca ->
|
|
let reg = xlate_name x instr in
|
|
let rand = Llvm.operand instr 0 in
|
|
let prefix, arg = xlate_value x rand in
|
|
let num = convert_to_siz (xlate_type x (Llvm.type_of rand)) arg in
|
|
assert (Poly.(Llvm.classify_type (Llvm.type_of instr) = Pointer)) ;
|
|
let len = size_of x (Llvm.type_of instr) in
|
|
emit_inst ~prefix (Inst.alloc ~reg ~num ~len ~loc)
|
|
| Call -> (
|
|
let maybe_llfunc = Llvm.operand instr (Llvm.num_operands instr - 1) in
|
|
let lltyp = Llvm.type_of maybe_llfunc in
|
|
assert (Poly.(Llvm.classify_type lltyp = Pointer)) ;
|
|
let llfunc =
|
|
let llfunc_valuekind = Llvm.classify_value maybe_llfunc in
|
|
match llfunc_valuekind with
|
|
| Function | Instruction _ | InlineAsm | Argument -> maybe_llfunc
|
|
| ConstantExpr -> (
|
|
match Llvm.constexpr_opcode maybe_llfunc with
|
|
| BitCast -> Llvm.operand maybe_llfunc 0
|
|
| _ ->
|
|
todo "opcode kind in call instruction %a" pp_llvalue
|
|
maybe_llfunc () )
|
|
| _ ->
|
|
todo "operand kind in call instruction %a" pp_llvalue
|
|
maybe_llfunc ()
|
|
in
|
|
let fname = Llvm.value_name llfunc in
|
|
let skip msg =
|
|
if StringS.add ignored_callees fname then
|
|
warn "ignoring uninterpreted %s %s" msg fname () ;
|
|
let reg = xlate_name_opt x instr in
|
|
emit_inst (Inst.nondet ~reg ~msg:fname ~loc)
|
|
in
|
|
(* intrinsics *)
|
|
match xlate_intrinsic_exp fname with
|
|
| Some intrinsic -> inline_or_move (intrinsic x)
|
|
| None -> (
|
|
match String.split_on_char fname ~by:'.' with
|
|
| ["__llair_throw"] ->
|
|
let pre, exc = xlate_value x (Llvm.operand instr 0) in
|
|
emit_term ~prefix:(pop loc @ pre) (Term.throw ~exc ~loc)
|
|
| ["__llair_alloc" (* void* __llair_alloc(unsigned size) *)] ->
|
|
let reg = xlate_name x instr in
|
|
let num_operand = Llvm.operand instr 0 in
|
|
let prefix, arg = xlate_value x num_operand in
|
|
let num =
|
|
convert_to_siz (xlate_type x (Llvm.type_of num_operand)) arg
|
|
in
|
|
let len = 1 in
|
|
emit_inst ~prefix (Inst.alloc ~reg ~num ~len ~loc)
|
|
| ["_Znwm" (* operator new(size_t num) *)]
|
|
|[ "_ZnwmSt11align_val_t"
|
|
(* operator new(unsigned long, std::align_val_t) *) ] ->
|
|
let reg = xlate_name x instr in
|
|
let prefix, num = xlate_value x (Llvm.operand instr 0) in
|
|
let len = size_of x (Llvm.type_of instr) in
|
|
emit_inst ~prefix (Inst.alloc ~reg ~num ~len ~loc)
|
|
| ["_ZdlPv" (* operator delete(void* ptr) *)]
|
|
|[ "_ZdlPvSt11align_val_t"
|
|
(* operator delete(void* ptr, std::align_val_t) *) ]
|
|
|[ "_ZdlPvmSt11align_val_t"
|
|
(* operator delete(void* ptr, unsigned long, std::align_val_t) *)
|
|
]
|
|
|["free" (* void free(void* ptr) *)] ->
|
|
let prefix, ptr = xlate_value x (Llvm.operand instr 0) in
|
|
emit_inst ~prefix (Inst.free ~ptr ~loc)
|
|
| "llvm" :: "memset" :: _ ->
|
|
let pre_0, dst = xlate_value x (Llvm.operand instr 0) in
|
|
let pre_1, byt = xlate_value x (Llvm.operand instr 1) in
|
|
let pre_2, len = xlate_value x (Llvm.operand instr 2) in
|
|
emit_inst
|
|
~prefix:(pre_0 @ pre_1 @ pre_2)
|
|
(Inst.memset ~dst ~byt ~len ~loc)
|
|
| "llvm" :: "memcpy" :: _ ->
|
|
let pre_0, dst = xlate_value x (Llvm.operand instr 0) in
|
|
let pre_1, src = xlate_value x (Llvm.operand instr 1) in
|
|
let pre_2, len = xlate_value x (Llvm.operand instr 2) in
|
|
emit_inst
|
|
~prefix:(pre_0 @ pre_1 @ pre_2)
|
|
(Inst.memcpy ~dst ~src ~len ~loc)
|
|
| "llvm" :: "memmove" :: _ ->
|
|
let pre_0, dst = xlate_value x (Llvm.operand instr 0) in
|
|
let pre_1, src = xlate_value x (Llvm.operand instr 1) in
|
|
let pre_2, len = xlate_value x (Llvm.operand instr 2) in
|
|
emit_inst
|
|
~prefix:(pre_0 @ pre_1 @ pre_2)
|
|
(Inst.memmov ~dst ~src ~len ~loc)
|
|
| ["abort"] | ["llvm"; "trap"] -> emit_inst (Inst.abort ~loc)
|
|
(* dropped / handled elsewhere *)
|
|
| ["llvm"; "dbg"; ("declare" | "value")]
|
|
|"llvm" :: ("lifetime" | "invariant") :: ("start" | "end") :: _ ->
|
|
nop ()
|
|
(* unimplemented *)
|
|
| ["llvm"; ("stacksave" | "stackrestore")] ->
|
|
skip "dynamic stack deallocation"
|
|
| "llvm" :: "coro" :: _ ->
|
|
todo "coroutines:@ %a" pp_llvalue instr ()
|
|
| "llvm" :: "experimental" :: "gc" :: "statepoint" :: _ ->
|
|
todo "statepoints:@ %a" pp_llvalue instr ()
|
|
| ["llvm"; ("va_start" | "va_copy" | "va_end")] ->
|
|
skip "variadic function intrinsic"
|
|
| "llvm" :: _ -> skip "intrinsic"
|
|
| _ when Poly.equal (Llvm.classify_value llfunc) InlineAsm ->
|
|
skip "inline asm"
|
|
(* general function call that may not throw *)
|
|
| _ ->
|
|
let pre0, callee = xlate_func_name x llfunc in
|
|
let typ = xlate_type x lltyp in
|
|
let lbl = name ^ ".ret" in
|
|
let pre, call =
|
|
let pre, actuals =
|
|
let num_actuals =
|
|
if not (Llvm.is_var_arg (Llvm.element_type lltyp)) then
|
|
Llvm.num_arg_operands instr
|
|
else
|
|
let fname = Llvm.value_name llfunc in
|
|
if
|
|
StringS.add ignored_callees fname
|
|
&& not (Llvm.is_declaration llfunc)
|
|
then
|
|
warn
|
|
"ignoring variable arguments to variadic function: \
|
|
%a"
|
|
Exp.pp callee () ;
|
|
let llfty = Llvm.element_type lltyp in
|
|
( match Llvm.classify_type llfty with
|
|
| Function -> ()
|
|
| _ ->
|
|
fail "called function not of function type: %a"
|
|
pp_llvalue instr () ) ;
|
|
Array.length (Llvm.param_types llfty)
|
|
in
|
|
xlate_values x num_actuals (Llvm.operand instr)
|
|
in
|
|
let areturn = xlate_name_opt x instr in
|
|
let return = Jump.mk lbl in
|
|
( pre
|
|
, Term.call ~callee ~typ ~actuals ~areturn ~return ~throw:None
|
|
~loc )
|
|
in
|
|
continue (fun (insts, term) ->
|
|
let cmnd = IArray.of_list insts in
|
|
(pre0 @ pre, call, [Block.mk ~lbl ~cmnd ~term]) ) ) )
|
|
| Invoke -> (
|
|
let llfunc = Llvm.operand instr (Llvm.num_operands instr - 3) in
|
|
let lltyp = Llvm.type_of llfunc in
|
|
assert (Poly.(Llvm.classify_type lltyp = Pointer)) ;
|
|
let fname = Llvm.value_name llfunc in
|
|
let return_blk = Llvm.get_normal_dest instr in
|
|
let unwind_blk = Llvm.get_unwind_dest instr in
|
|
let num_actuals =
|
|
if not (Llvm.is_var_arg (Llvm.element_type lltyp)) then
|
|
Llvm.num_arg_operands instr
|
|
else (
|
|
if
|
|
StringS.add ignored_callees fname
|
|
&& not (Llvm.is_declaration llfunc)
|
|
then
|
|
warn "ignoring variable arguments to variadic function: %a"
|
|
Global.pp (xlate_global x llfunc).name () ;
|
|
assert (Poly.(Llvm.classify_type lltyp = Pointer)) ;
|
|
Array.length (Llvm.param_types (Llvm.element_type lltyp)) )
|
|
in
|
|
(* intrinsics *)
|
|
match String.split_on_char fname ~by:'.' with
|
|
| _ when Option.is_some (xlate_intrinsic_exp fname) ->
|
|
let prefix, dst, blocks = xlate_jump x instr return_blk loc [] in
|
|
emit_term ~prefix (Term.goto ~dst ~loc) ~blocks
|
|
| ["__llair_throw"] ->
|
|
let prefix, dst, blocks = xlate_jump x instr unwind_blk loc [] in
|
|
emit_term ~prefix (Term.goto ~dst ~loc) ~blocks
|
|
| ["abort"] -> emit_term ~prefix:[Inst.abort ~loc] Term.unreachable
|
|
| ["_Znwm" (* operator new(size_t num) *)]
|
|
|[ "_ZnwmSt11align_val_t"
|
|
(* operator new(unsigned long num, std::align_val_t) *) ]
|
|
when num_actuals > 0 ->
|
|
let reg = xlate_name x instr in
|
|
let pre_0, num = xlate_value x (Llvm.operand instr 0) in
|
|
let len = size_of x (Llvm.type_of instr) in
|
|
let prefix, dst, blocks = xlate_jump x instr return_blk loc [] in
|
|
emit_term
|
|
~prefix:(pre_0 @ (Inst.alloc ~reg ~num ~len ~loc :: prefix))
|
|
(Term.goto ~dst ~loc) ~blocks
|
|
(* unimplemented *)
|
|
| "llvm" :: "experimental" :: "gc" :: "statepoint" :: _ ->
|
|
todo "statepoints:@ %a" pp_llvalue instr ()
|
|
(* general function call that may throw *)
|
|
| _ ->
|
|
let pre_0, callee = xlate_func_name x llfunc in
|
|
let typ = xlate_type x (Llvm.type_of llfunc) in
|
|
let pre_1, actuals =
|
|
xlate_values x num_actuals (Llvm.operand instr)
|
|
in
|
|
let areturn = xlate_name_opt x instr in
|
|
let pre_2, return, blocks =
|
|
xlate_jump x instr return_blk loc []
|
|
in
|
|
let pre_3, throw, blocks =
|
|
xlate_jump x instr unwind_blk loc blocks
|
|
in
|
|
let throw = Some throw in
|
|
emit_term
|
|
~prefix:(List.concat [pre_0; pre_1; pre_2; pre_3])
|
|
(Term.call ~callee ~typ ~actuals ~areturn ~return ~throw ~loc)
|
|
~blocks )
|
|
| Ret ->
|
|
let pre, exp =
|
|
if Llvm.num_operands instr = 0 then ([], None)
|
|
else
|
|
let pre, arg = xlate_value x (Llvm.operand instr 0) in
|
|
(pre, Some arg)
|
|
in
|
|
emit_term ~prefix:(pop loc @ pre) (Term.return ~exp ~loc)
|
|
| Br -> (
|
|
match Option.get_exn (Llvm.get_branch instr) with
|
|
| `Unconditional blk ->
|
|
let prefix, dst, blocks = xlate_jump x instr blk loc [] in
|
|
emit_term ~prefix (Term.goto ~dst ~loc) ~blocks
|
|
| `Conditional (cnd, thn, els) ->
|
|
let pre_c, key = xlate_value x cnd in
|
|
let pre_t, thn, blocks = xlate_jump x instr thn loc [] in
|
|
let pre_e, els, blocks = xlate_jump x instr els loc blocks in
|
|
emit_term
|
|
~prefix:(List.concat [pre_c; pre_t; pre_e])
|
|
(Term.branch ~key ~nzero:thn ~zero:els ~loc)
|
|
~blocks )
|
|
| Switch ->
|
|
let pre_k, key = xlate_value x (Llvm.operand instr 0) in
|
|
let pre_t, cases, blocks =
|
|
let num_cases = (Llvm.num_operands instr / 2) - 1 in
|
|
let rec xlate_cases i blocks =
|
|
if i <= num_cases then
|
|
let idx = Llvm.operand instr (2 * i) in
|
|
let blk =
|
|
Llvm.block_of_value (Llvm.operand instr ((2 * i) + 1))
|
|
in
|
|
let pre_i, num = xlate_value x idx in
|
|
let pre_j, jmp, blocks = xlate_jump x instr blk loc blocks in
|
|
let pre, rest, blocks = xlate_cases (i + 1) blocks in
|
|
(List.concat [pre_i; pre_j; pre], (num, jmp) :: rest, blocks)
|
|
else ([], [], blocks)
|
|
in
|
|
xlate_cases 1 []
|
|
in
|
|
let tbl = IArray.of_list cases in
|
|
let blk = Llvm.block_of_value (Llvm.operand instr 1) in
|
|
let pre_e, els, blocks = xlate_jump x instr blk loc blocks in
|
|
emit_term
|
|
~prefix:(List.concat [pre_k; pre_t; pre_e])
|
|
(Term.switch ~key ~tbl ~els ~loc)
|
|
~blocks
|
|
| IndirectBr ->
|
|
let pre_0, ptr = xlate_value x (Llvm.operand instr 0) in
|
|
let num_dests = Llvm.num_operands instr - 1 in
|
|
let pre, lldests, blocks =
|
|
let rec dests i blocks =
|
|
if i <= num_dests then
|
|
let v = Llvm.operand instr i in
|
|
let blk = Llvm.block_of_value v in
|
|
let pre_j, jmp, blocks = xlate_jump x instr blk loc blocks in
|
|
let pre, rest, blocks = dests (i + 1) blocks in
|
|
(pre_j @ pre, jmp :: rest, blocks)
|
|
else ([], [], blocks)
|
|
in
|
|
dests 1 []
|
|
in
|
|
let tbl = IArray.of_list lldests in
|
|
emit_term ~prefix:(pre_0 @ pre) (Term.iswitch ~ptr ~tbl ~loc) ~blocks
|
|
| LandingPad ->
|
|
(* Translate the landingpad clauses to code to load the type_info from
|
|
the thrown exception, and test the type_info against the clauses,
|
|
eventually jumping to the handler code following the landingpad,
|
|
passing a value for the selector which the handler code tests to
|
|
e.g. either cleanup or rethrow. *)
|
|
let i32, tip, cxa_exception = landingpad_typs x instr in
|
|
let pi8, _, exc_typ = exception_typs in
|
|
let exc = Exp.reg (Reg.mk pi8 (find_name instr ^ ".exc")) in
|
|
let ti = Reg.mk tip (name ^ ".ti") in
|
|
(* std::type_info* ti = ((__cxa_exception* )exc - 1)->exceptionType *)
|
|
let load_ti =
|
|
let typ = cxa_exception in
|
|
(* field number of the exceptionType member of __cxa_exception *)
|
|
let fld = 0 in
|
|
(* index from exc that points to header *)
|
|
let idx = Exp.integer Typ.siz Z.minus_one in
|
|
let ptr =
|
|
ptr_fld x
|
|
~ptr:(ptr_idx x ~ptr:exc ~idx ~llelt:typ)
|
|
~fld ~lltyp:typ
|
|
in
|
|
let len = Exp.integer Typ.siz (Z.of_int (size_of x typ)) in
|
|
Inst.load ~reg:ti ~ptr ~len ~loc
|
|
in
|
|
let ti = Exp.reg ti in
|
|
let typeid = xlate_llvm_eh_typeid_for x tip ti in
|
|
let lbl = name ^ ".unwind" in
|
|
let reg = xlate_name x instr in
|
|
let jump_unwind i sel rev_blocks =
|
|
let exp = Exp.record exc_typ (IArray.of_array [|exc; sel|]) in
|
|
let mov =
|
|
Inst.move ~reg_exps:(IArray.of_array [|(reg, exp)|]) ~loc
|
|
in
|
|
let lbl_i = lbl ^ "." ^ Int.to_string i in
|
|
let blk =
|
|
Block.mk ~lbl:lbl_i
|
|
~cmnd:(IArray.of_array [|mov|])
|
|
~term:(Term.goto ~dst:(Jump.mk lbl) ~loc)
|
|
in
|
|
(Jump.mk lbl_i, blk :: rev_blocks)
|
|
in
|
|
let goto_unwind i sel blocks =
|
|
let dst, blocks = jump_unwind i sel blocks in
|
|
([], Term.goto ~dst ~loc, blocks)
|
|
in
|
|
let pre, term_unwind, rev_blocks =
|
|
if Llvm.is_cleanup instr then
|
|
goto_unwind 0 (Exp.integer i32 Z.zero) []
|
|
else
|
|
let num_clauses = Llvm.num_operands instr in
|
|
let lbl i = name ^ "." ^ Int.to_string i in
|
|
let jump i = Jump.mk (lbl i) in
|
|
let block i term =
|
|
Block.mk ~lbl:(lbl i) ~cmnd:IArray.empty ~term
|
|
in
|
|
let match_filter i rev_blocks =
|
|
jump_unwind i
|
|
(Exp.sub ~typ:i32 (Exp.integer i32 Z.zero) typeid)
|
|
rev_blocks
|
|
in
|
|
let xlate_clause i rev_blocks =
|
|
let clause = Llvm.operand instr i in
|
|
let num_tis = Llvm.num_operands clause in
|
|
if num_tis = 0 then
|
|
let dst, rev_blocks = match_filter i rev_blocks in
|
|
([], Term.goto ~dst ~loc, rev_blocks)
|
|
else
|
|
match Llvm.classify_type (Llvm.type_of clause) with
|
|
| Array (* filter *) -> (
|
|
match Llvm.classify_value clause with
|
|
| ConstantArray ->
|
|
let rec xlate_filter i =
|
|
let preI, tiI =
|
|
xlate_value x (Llvm.operand clause i)
|
|
in
|
|
if i < num_tis - 1 then
|
|
let pre, dqs = xlate_filter (i + 1) in
|
|
( preI @ pre
|
|
, Exp.and_ ~typ:Typ.bool (Exp.dq ~typ:tip tiI ti)
|
|
dqs )
|
|
else (preI, Exp.dq ~typ:tip tiI ti)
|
|
in
|
|
let pre, key = xlate_filter 0 in
|
|
let nzero, rev_blocks = match_filter i rev_blocks in
|
|
( pre
|
|
, Term.branch ~loc ~key ~nzero ~zero:(jump (i + 1))
|
|
, rev_blocks )
|
|
| _ -> fail "xlate_instr: %a" pp_llvalue instr () )
|
|
| _ (* catch *) ->
|
|
let typ = xlate_type x (Llvm.type_of clause) in
|
|
let pre, clause = xlate_value x clause in
|
|
let key =
|
|
Exp.or_ ~typ:Typ.bool
|
|
(Exp.eq ~typ clause Exp.null)
|
|
(Exp.eq ~typ clause ti)
|
|
in
|
|
let nzero, rev_blocks = jump_unwind i typeid rev_blocks in
|
|
( pre
|
|
, Term.branch ~loc ~key ~nzero ~zero:(jump (i + 1))
|
|
, rev_blocks )
|
|
in
|
|
let rec rev_blocks i z =
|
|
if i < num_clauses then
|
|
let pre_i, term, z = xlate_clause i z in
|
|
let pre, blks = rev_blocks (i + 1) (block i term :: z) in
|
|
(pre_i @ pre, blks)
|
|
else ([], block i Term.unreachable :: z)
|
|
in
|
|
let pre1, rev_blks = rev_blocks 1 [] in
|
|
let pre0, term, blks = xlate_clause 0 rev_blks in
|
|
(pre0 @ pre1, term, blks)
|
|
in
|
|
continue (fun (insts, term) ->
|
|
( load_ti :: pre
|
|
, term_unwind
|
|
, List.rev_append rev_blocks
|
|
[Block.mk ~lbl ~cmnd:(IArray.of_list insts) ~term] ) )
|
|
| Resume ->
|
|
let llrcd = Llvm.operand instr 0 in
|
|
let typ = xlate_type x (Llvm.type_of llrcd) in
|
|
let pre, rcd = xlate_value x llrcd in
|
|
let exc = Exp.select typ rcd 0 in
|
|
emit_term ~prefix:(pop loc @ pre) (Term.throw ~exc ~loc)
|
|
| Unreachable -> emit_term Term.unreachable
|
|
| Trunc | ZExt | SExt | FPToUI | FPToSI | UIToFP | SIToFP | FPTrunc
|
|
|FPExt | PtrToInt | IntToPtr | BitCast | AddrSpaceCast | Add | FAdd
|
|
|Sub | FSub | Mul | FMul | UDiv | SDiv | FDiv | URem | SRem | FRem
|
|
|Shl | LShr | AShr | And | Or | Xor | ICmp | FCmp | Select
|
|
|GetElementPtr | ExtractElement | InsertElement | ShuffleVector
|
|
|ExtractValue | InsertValue ->
|
|
inline_or_move (xlate_value ~inline:true x)
|
|
| VAArg ->
|
|
let reg = xlate_name_opt x instr in
|
|
warn "variadic function argument: %a" Loc.pp loc () ;
|
|
emit_inst (Inst.nondet ~reg ~msg:"vaarg" ~loc)
|
|
| CleanupRet | CatchRet | CatchPad | CleanupPad | CatchSwitch ->
|
|
todo "windows exception handling: %a" pp_llvalue instr ()
|
|
| Fence | AtomicCmpXchg | AtomicRMW ->
|
|
fail "xlate_instr: %a" pp_llvalue instr ()
|
|
| PHI | Invalid | Invalid2 | UserOp1 | UserOp2 -> assert false
|
|
|
|
let skip_phis : Llvm.llbasicblock -> _ Llvm.llpos =
|
|
fun blk ->
|
|
let rec skip_phis_ (pos : _ Llvm.llpos) =
|
|
match pos with
|
|
| Before instr -> (
|
|
match Llvm.instr_opcode instr with
|
|
| PHI -> skip_phis_ (Llvm.instr_succ instr)
|
|
| _ -> pos )
|
|
| _ -> pos
|
|
in
|
|
skip_phis_ (Llvm.instr_begin blk)
|
|
|
|
let rec xlate_instrs : pop_thunk -> x -> _ Llvm.llpos -> code =
|
|
fun pop x -> function
|
|
| Before instrI ->
|
|
xlate_instr pop x instrI (fun xlate_instrI ->
|
|
let instrJ = Llvm.instr_succ instrI in
|
|
let instsJ, termJ, blocksJN = xlate_instrs pop x instrJ in
|
|
let instsI, termI, blocksI = xlate_instrI (instsJ, termJ) in
|
|
(instsI, termI, blocksI @ blocksJN) )
|
|
| At_end blk -> fail "xlate_instrs: %a" pp_llblock blk ()
|
|
|
|
let xlate_block : pop_thunk -> x -> Llvm.llbasicblock -> Llair.block list =
|
|
fun pop x blk ->
|
|
[%Trace.call fun {pf} -> pf "%a" pp_llblock blk]
|
|
;
|
|
let lbl = label_of_block blk in
|
|
let pos = skip_phis blk in
|
|
let insts, term, blocks = xlate_instrs pop x pos in
|
|
Block.mk ~lbl ~cmnd:(IArray.of_list insts) ~term :: blocks
|
|
|>
|
|
[%Trace.retn fun {pf} blocks -> pf "%s" (List.hd_exn blocks).lbl]
|
|
|
|
let report_undefined func name =
|
|
if Option.is_some (Llvm.use_begin func) then
|
|
[%Trace.info "undefined function: %a" Function.pp name]
|
|
|
|
let xlate_function : x -> Llvm.llvalue -> Llair.func =
|
|
fun x llf ->
|
|
[%Trace.call fun {pf} -> pf "%a" pp_llvalue llf]
|
|
;
|
|
undef_count := 0 ;
|
|
let loc = find_loc llf in
|
|
let typ = xlate_type x (Llvm.type_of llf) in
|
|
let name = Function.mk typ (find_name llf) in
|
|
let formals =
|
|
Llvm.fold_left_params
|
|
(fun rev_args param -> xlate_name x param :: rev_args)
|
|
[] llf
|
|
in
|
|
let freturn =
|
|
match typ with
|
|
| Pointer {elt= Function {return= Some typ; _}} ->
|
|
Some (Reg.mk typ "freturn")
|
|
| _ -> None
|
|
in
|
|
let _, _, exc_typ = exception_typs in
|
|
let fthrow = Reg.mk exc_typ "fthrow" in
|
|
( match Llvm.block_begin llf with
|
|
| Before entry_blk ->
|
|
let pop = pop_stack_frame_of_function x llf entry_blk in
|
|
let[@warning "p"] (entry_block :: entry_blocks) =
|
|
xlate_block pop x entry_blk
|
|
in
|
|
let entry =
|
|
let {Llair.lbl; cmnd; term} = entry_block in
|
|
Block.mk ~lbl ~cmnd ~term
|
|
in
|
|
let cfg =
|
|
let rec trav_blocks rev_cfg prev =
|
|
match Llvm.block_succ prev with
|
|
| Before blk ->
|
|
trav_blocks
|
|
(List.rev_append (xlate_block pop x blk) rev_cfg)
|
|
blk
|
|
| At_end _ -> IArray.of_list_rev rev_cfg
|
|
in
|
|
trav_blocks (List.rev entry_blocks) entry_blk
|
|
in
|
|
Func.mk ~name ~formals ~freturn ~fthrow ~entry ~cfg ~loc
|
|
| At_end _ ->
|
|
report_undefined llf name ;
|
|
Func.mk_undefined ~name ~formals ~freturn ~fthrow ~loc )
|
|
|>
|
|
[%Trace.retn fun {pf} -> pf "@\n%a" Func.pp]
|
|
|
|
let transform ~internalize : Llvm.llmodule -> unit =
|
|
fun llmodule ->
|
|
let pm = Llvm.PassManager.create () in
|
|
let entry_points = Config.find_list "entry-points" in
|
|
if internalize then
|
|
Llvm_ipo.add_internalize_predicate pm (fun fn ->
|
|
List.exists entry_points ~f:(String.equal fn) ) ;
|
|
Llvm_ipo.add_global_dce pm ;
|
|
Llvm_ipo.add_global_optimizer pm ;
|
|
Llvm_ipo.add_merge_functions pm ;
|
|
Llvm_ipo.add_constant_merge pm ;
|
|
Llvm_ipo.add_argument_promotion pm ;
|
|
Llvm_ipo.add_ipsccp pm ;
|
|
Llvm_scalar_opts.add_memory_to_register_promotion pm ;
|
|
Llvm_scalar_opts.add_dce pm ;
|
|
Llvm_ipo.add_global_dce pm ;
|
|
Llvm_ipo.add_dead_arg_elimination pm ;
|
|
Llvm_scalar_opts.add_lower_atomic pm ;
|
|
Llvm_scalar_opts.add_scalar_repl_aggregation pm ;
|
|
Llvm_scalar_opts.add_scalarizer pm ;
|
|
Llvm_scalar_opts.add_unify_function_exit_nodes pm ;
|
|
Llvm_scalar_opts.add_cfg_simplification pm ;
|
|
Llvm.PassManager.run_module llmodule pm |> (ignore : bool -> _) ;
|
|
Llvm.PassManager.dispose pm
|
|
|
|
let read_and_parse llcontext bc_file =
|
|
[%Trace.call fun {pf} -> pf "%s" bc_file]
|
|
;
|
|
let llmemorybuffer =
|
|
try Llvm.MemoryBuffer.of_file bc_file
|
|
with Llvm.IoError msg -> fail "%s: %s" bc_file msg ()
|
|
in
|
|
( try Llvm_irreader.parse_ir llcontext llmemorybuffer
|
|
with Llvm_irreader.Error msg -> invalid_llvm msg )
|
|
|>
|
|
[%Trace.retn fun {pf} _ -> pf ""]
|
|
|
|
let link_in : Llvm.llcontext -> Llvm.lllinker -> string -> unit =
|
|
fun llcontext link_ctx bc_file ->
|
|
Llvm_linker.link_in link_ctx (read_and_parse llcontext bc_file)
|
|
|
|
let check_datalayout llcontext lldatalayout =
|
|
let check_size llt typ =
|
|
let llsiz =
|
|
match
|
|
Int64.unsigned_to_int
|
|
(Llvm_target.DataLayout.abi_size llt lldatalayout)
|
|
with
|
|
| Some n -> n
|
|
| None -> fail "type size too large: %a" pp_lltype llt ()
|
|
in
|
|
let siz = Typ.size_of typ in
|
|
if llsiz != siz then
|
|
todo "size_of %a = %i != %i" Typ.pp typ llsiz siz ()
|
|
in
|
|
check_size (Llvm.i1_type llcontext) Typ.bool ;
|
|
check_size (Llvm.i8_type llcontext) Typ.byt ;
|
|
check_size (Llvm.i32_type llcontext) Typ.int ;
|
|
check_size (Llvm.i64_type llcontext) Typ.siz ;
|
|
check_size
|
|
(Llvm_target.DataLayout.intptr_type llcontext lldatalayout)
|
|
Typ.ptr
|
|
|
|
(* The Llvm.dispose_ functions free memory allocated off the OCaml heap. The
|
|
OCaml heap can later grow into that memory once it is freed. There are
|
|
naked pointers into the LLVM-allocated memory from various values
|
|
returned from Llvm functions. If the GC scans a block with such a naked
|
|
pointer after the heap has grown into the memory previously allocated by
|
|
Llvm, the GC will follow the pointer expecting a well-formed OCaml value,
|
|
and likely segfault. Therefore it is necessary to ensure that all the
|
|
values containing naked pointers are dead (which is the reason for
|
|
clearing the hashtbls) and then collected (which is the reason for the
|
|
Gc.full_major) before freeing the memory with Llvm.dispose_module and
|
|
Llvm.dispose_context. *)
|
|
let cleanup llmodule llcontext =
|
|
SymTbl.clear sym_tbl ;
|
|
ScopeTbl.clear scope_tbl ;
|
|
LltypeTbl.clear anon_struct_name ;
|
|
LltypeTbl.clear memo_type ;
|
|
GlobTbl.clear memo_global ;
|
|
ValTbl.clear memo_value ;
|
|
StringS.clear ignored_callees ;
|
|
Gc.full_major () ;
|
|
Llvm.dispose_module llmodule ;
|
|
Llvm.dispose_context llcontext
|
|
|
|
let translate ~models ~fuzzer ~internalize : string list -> Llair.program =
|
|
fun inputs ->
|
|
[%Trace.call fun {pf} ->
|
|
pf "%a" (List.pp "@ " Format.pp_print_string) inputs]
|
|
;
|
|
Llvm.install_fatal_error_handler invalid_llvm ;
|
|
let llcontext = Llvm.global_context () in
|
|
let input, inputs = List.pop_exn inputs in
|
|
let llmodule = read_and_parse llcontext input in
|
|
let link_ctx = Llvm_linker.get_linker llmodule in
|
|
List.iter ~f:(link_in llcontext link_ctx) inputs ;
|
|
let link_model_file name =
|
|
Llvm_linker.link_in link_ctx
|
|
(Llvm_irreader.parse_ir llcontext
|
|
(Llvm.MemoryBuffer.of_string (Option.get_exn (Model.read name))))
|
|
in
|
|
if models then link_model_file "/cxxabi.bc" ;
|
|
if fuzzer then link_model_file "/lib_fuzzer_main.bc" ;
|
|
Llvm_linker.linker_dispose link_ctx ;
|
|
assert (
|
|
Llvm_analysis.verify_module llmodule |> Option.for_all ~f:invalid_llvm
|
|
) ;
|
|
transform ~internalize llmodule ;
|
|
scan_names_and_locs llmodule ;
|
|
let lldatalayout =
|
|
Llvm_target.DataLayout.of_string (Llvm.data_layout llmodule)
|
|
in
|
|
check_datalayout llcontext lldatalayout ;
|
|
let x = {llcontext; lldatalayout} in
|
|
let globals =
|
|
Llvm.fold_left_globals
|
|
(fun globals llg ->
|
|
if
|
|
Poly.equal (Llvm.linkage llg) Appending
|
|
&& Llvm.(array_length (element_type (type_of llg))) = 0
|
|
then globals
|
|
else xlate_global x llg :: globals )
|
|
[] llmodule
|
|
in
|
|
let functions =
|
|
Llvm.fold_left_functions
|
|
(fun functions llf ->
|
|
let name = Llvm.value_name llf in
|
|
if
|
|
String.prefix name ~pre:"__llair_"
|
|
|| String.prefix name ~pre:"llvm."
|
|
then functions
|
|
else xlate_function x llf :: functions )
|
|
[] llmodule
|
|
in
|
|
cleanup llmodule llcontext ;
|
|
Llair.Program.mk ~globals ~functions
|
|
|>
|
|
[%Trace.retn fun {pf} _ ->
|
|
pf "number of globals %d, number of functions %d" (List.length globals)
|
|
(List.length functions)]
|