625 lines
20 KiB
OCaml
625 lines
20 KiB
OCaml
open Std
|
|
module CFG = BStd.Graphs.Ir
|
|
|
|
type memory_offset = int64
|
|
type memory_address = int64
|
|
|
|
module AddrMap = Map.Make(Int64)
|
|
module AddrSet = Set.Make(Int64)
|
|
|
|
type cfa_pos =
|
|
RspOffset of memory_offset
|
|
| RbpOffset of memory_offset
|
|
| CfaLostTrack
|
|
|
|
type rbp_pos =
|
|
| RbpUndef
|
|
| RbpCfaOffset of memory_offset
|
|
|
|
type reg_pos = cfa_pos * rbp_pos
|
|
|
|
type reg_changes_fde = reg_pos AddrMap.t
|
|
|
|
type subroutine_cfa_data = {
|
|
reg_changes_fde: reg_changes_fde;
|
|
beg_pos: memory_address;
|
|
end_pos: memory_address;
|
|
}
|
|
|
|
type block_local_state = {
|
|
rbp_vars: BStd.Var.Set.t
|
|
}
|
|
|
|
module StrMap = Map.Make(String)
|
|
type subroutine_cfa_map = subroutine_cfa_data StrMap.t
|
|
|
|
module TIdMap = Map.Make(BStd.Tid)
|
|
|
|
exception InvalidSub
|
|
exception UnexpectedRbpSet
|
|
|
|
let pp_cfa_pos ppx = function
|
|
| RspOffset off -> Format.fprintf ppx "RSP + (%s)" (Int64.to_string off)
|
|
| RbpOffset off -> Format.fprintf ppx "RBP + (%s)" (Int64.to_string off)
|
|
| CfaLostTrack -> Format.fprintf ppx "??@."
|
|
|
|
let pp_int64_hex ppx number =
|
|
let mask_short = Int64.(pred (shift_left one 16)) in
|
|
let pp_short number =
|
|
Format.fprintf ppx "%04x" Int64.(to_int (logand number mask_short))
|
|
in
|
|
List.iter pp_short @@ List.map (fun x ->
|
|
Int64.(shift_right number (16*x))) [3;2;1;0]
|
|
|
|
let pp_cfa_changes_fde ppx cfa_changes = AddrMap.iter
|
|
(fun addr change ->
|
|
Format.fprintf ppx "%a: %a@."
|
|
pp_int64_hex addr
|
|
pp_cfa_pos change)
|
|
cfa_changes
|
|
|
|
let pp_cfa_changes ppx =
|
|
StrMap.iter (fun fde_name entry ->
|
|
Format.fprintf ppx "%s@\n====@\n@\n%a@." fde_name
|
|
pp_cfa_changes_fde entry)
|
|
|
|
let pp_option_of sub_pp ppx = function
|
|
| None -> Format.fprintf ppx "None"
|
|
| Some x -> Format.fprintf ppx "Some %a" sub_pp x
|
|
|
|
let opt_addr_of term =
|
|
(** Get the address of a term as an option, if it has one*)
|
|
BStd.Term.get_attr term BStd.address
|
|
|
|
let addr_of term =
|
|
(** Get the address of a term *)
|
|
match opt_addr_of term with
|
|
| None -> assert false
|
|
| Some addr -> addr
|
|
|
|
let opt_addr_of_blk_elt = function
|
|
| `Def def -> opt_addr_of def
|
|
| `Jmp jmp -> opt_addr_of jmp
|
|
| `Phi phi -> opt_addr_of phi
|
|
|
|
let entrypoint_address blk =
|
|
(** Find the first instruction address in the current block.
|
|
Return None if no instruction has address. *)
|
|
let fold_one accu cur_elt = match accu, opt_addr_of_blk_elt cur_elt with
|
|
| None, None -> None
|
|
| None, Some x -> Some x
|
|
| _, _ -> accu
|
|
in
|
|
|
|
BStd.Seq.fold (BStd.Blk.elts blk)
|
|
~init:None
|
|
~f:fold_one
|
|
|
|
let to_int64_addr addr =
|
|
BStd.Word.to_int64_exn addr
|
|
|
|
let int64_addr_of x = to_int64_addr @@ addr_of x
|
|
|
|
let map_option f = function
|
|
| None -> None
|
|
| Some x -> Some (f x)
|
|
|
|
let build_next_instr graph =
|
|
(** Build a map of memory_address -> AddrSet.t holding, for each address, the
|
|
set of instructions coming right after the instruction at given address.
|
|
There might be multiple such addresses, if the current instruction is at
|
|
a point of branching. *)
|
|
|
|
let addresses_in_block blk =
|
|
(** Set of addresses present in the block *)
|
|
BStd.Seq.fold (BStd.Blk.elts blk)
|
|
~init:AddrSet.empty
|
|
~f:(fun accu elt ->
|
|
let addr = opt_addr_of_blk_elt elt in
|
|
match addr with
|
|
| None -> accu
|
|
| Some x ->
|
|
(try
|
|
AddrSet.add (BStd.Word.to_int64_exn x) accu
|
|
with _ -> accu)
|
|
)
|
|
in
|
|
|
|
let node_successors_addr (nd: CFG.node) : AddrSet.t =
|
|
let rec do_find_succ accu nd =
|
|
let fold_one accu c_node =
|
|
match entrypoint_address (CFG.Node.label c_node) with
|
|
| Some addr ->
|
|
(try
|
|
AddrSet.add (BStd.Word.to_int64_exn addr) accu
|
|
with _ -> accu)
|
|
| None -> do_find_succ accu c_node
|
|
in
|
|
|
|
let succ = CFG.Node.succs nd graph in
|
|
BStd.Seq.fold succ
|
|
~init:accu
|
|
~f:fold_one
|
|
in
|
|
do_find_succ AddrSet.empty nd
|
|
in
|
|
|
|
let build_of_block accu_map node =
|
|
let blk = CFG.Node.label node in
|
|
let node_successors = node_successors_addr node in
|
|
let instr_addresses = AddrSet.elements @@ addresses_in_block blk in
|
|
|
|
let rec accumulate_mappings mappings addr_list = function
|
|
| None -> mappings
|
|
| Some (instr, instr_seq) as cur_instr ->
|
|
let instr_addr = opt_addr_of_blk_elt instr in
|
|
match (map_option to_int64_addr instr_addr), addr_list with
|
|
| None, _ ->
|
|
accumulate_mappings mappings addr_list @@ BStd.Seq.next instr_seq
|
|
| Some cur_addr, next_addr::t when cur_addr >= next_addr ->
|
|
accumulate_mappings mappings t cur_instr
|
|
| Some cur_addr, next_addr::_ ->
|
|
let n_mappings = AddrMap.add
|
|
cur_addr (AddrSet.singleton next_addr) mappings in
|
|
accumulate_mappings n_mappings addr_list @@ BStd.Seq.next instr_seq
|
|
| Some cur_addr, [] ->
|
|
let n_mappings = AddrMap.add
|
|
cur_addr node_successors mappings in
|
|
accumulate_mappings n_mappings addr_list @@ BStd.Seq.next instr_seq
|
|
in
|
|
accumulate_mappings
|
|
accu_map
|
|
instr_addresses
|
|
(BStd.Seq.next @@ BStd.Blk.elts blk)
|
|
in
|
|
|
|
BStd.Seq.fold (CFG.nodes graph)
|
|
~init:AddrMap.empty
|
|
~f:build_of_block
|
|
|
|
let interpret_var_expr c_var offset expr = BStd.Bil.(
|
|
let closed_form = BStd.Exp.substitute
|
|
(var c_var)
|
|
(int (BStd.Word.of_int64 (Int64.neg offset)))
|
|
expr
|
|
in
|
|
let res = BStd.Exp.eval closed_form in
|
|
match res with
|
|
| Imm value ->
|
|
Some (Int64.neg @@ BStd.Word.to_int64_exn @@ BStd.Word.signed value)
|
|
| _ -> None
|
|
)
|
|
|
|
let is_single_free_reg expr =
|
|
(** Detects whether `expr` contains a single free variable which is a machine
|
|
register, and if so, extracts this register and returns a pair `(formal,
|
|
reg`) of its formal variable in the expression and the register.
|
|
Otherwise return None. *)
|
|
let free_vars = BStd.Exp.free_vars expr in
|
|
let free_x86_regs = Regs.X86_64.map_varset free_vars in
|
|
(match Regs.DwRegOptSet.cardinal free_x86_regs with
|
|
| 1 ->
|
|
let free_var = Regs.DwRegOptSet.choose free_x86_regs in
|
|
(match free_var with
|
|
| Some dw_var ->
|
|
let bil_var = (match BStd.Var.Set.choose free_vars with
|
|
| None -> assert false
|
|
| Some x -> x) in
|
|
Some (bil_var, dw_var)
|
|
| _ -> None
|
|
)
|
|
| _ -> None
|
|
)
|
|
|
|
let process_def (local_state: block_local_state) def (cur_reg: reg_pos)
|
|
: (reg_pos option * block_local_state) =
|
|
let lose_track = Some CfaLostTrack in
|
|
|
|
let cur_cfa, cur_rbp = cur_reg in
|
|
let out_cfa =
|
|
(match cur_cfa, Regs.X86_64.of_var (BStd.Def.lhs def) with
|
|
| RspOffset(cur_offset), Some reg when reg = Regs.X86_64.rsp ->
|
|
let exp = BStd.Def.rhs def in
|
|
(match is_single_free_reg exp with
|
|
| Some (bil_var, dw_var) when dw_var = Regs.X86_64.rsp ->
|
|
let interpreted = interpret_var_expr bil_var cur_offset exp in
|
|
(match interpreted with
|
|
| None -> lose_track
|
|
| Some new_offset ->
|
|
Some (RspOffset(new_offset))
|
|
)
|
|
| _ -> lose_track
|
|
)
|
|
| RspOffset(cur_offset), Some reg when reg = Regs.X86_64.rbp ->
|
|
(* We have CFA=rsp+k and a line %rbp <- [expr].
|
|
Might be a %rbp <- %rsp *)
|
|
let exp = BStd.Def.rhs def in
|
|
(match is_single_free_reg exp with
|
|
| Some (bil_var, dw_var) when dw_var = Regs.X86_64.rsp ->
|
|
(* We have %rbp := F(%rsp) *)
|
|
(* FIXME we wish to have %rbp := %rsp. An ugly and non-robust test to
|
|
check that would be interpret F(0), expecting that F is at worst
|
|
affine - then a restult of 0 means that %rbp := %rsp + 0 *)
|
|
let interpreted = interpret_var_expr bil_var (Int64.zero) exp in
|
|
(match interpreted with
|
|
| Some offset when offset = Int64.zero ->
|
|
Some (RbpOffset(cur_offset))
|
|
| _ ->
|
|
(* Previous instruction was rsp-indexed, here we put something
|
|
weird in %rbp, let's keep indexing with rsp and do nothing *)
|
|
None
|
|
)
|
|
| _ -> None
|
|
)
|
|
| RbpOffset(cur_offset), Some reg when reg = Regs.X86_64.rbp ->
|
|
(* Assume we are overwriting %rbp with something — we must revert to
|
|
some rsp-based indexing *)
|
|
(* FIXME don't assume the rsp offset will always be 8, find a smart way
|
|
to figure this out.
|
|
We actually use offset 16 because the `pop` will occur after the
|
|
value is read from the stack.
|
|
*)
|
|
Some (RspOffset(Int64.of_int 16))
|
|
| _ -> None
|
|
) in
|
|
|
|
let is_rbp_save_expr expr local_state =
|
|
let free_vars = BStd.Exp.free_vars expr in
|
|
let card = BStd.Var.Set.length free_vars in
|
|
let has_mem_var = BStd.Var.Set.exists
|
|
~f:(fun x -> BStd.Var.name x = "mem")
|
|
free_vars in
|
|
let free_x86_regs = Regs.X86_64.map_varset free_vars in
|
|
let has_rsp_var = free_x86_regs
|
|
|> Regs.DwRegOptSet.exists
|
|
(fun x -> match x with
|
|
| Some x when x = Regs.X86_64.rsp -> true
|
|
| _ -> false) in
|
|
let has_rbp_var = free_x86_regs
|
|
|> Regs.DwRegOptSet.exists
|
|
(fun x -> match x with
|
|
| Some x when x = Regs.X86_64.rbp -> true
|
|
| _ -> false) in
|
|
let has_intermed_rbp_var = free_vars
|
|
|> BStd.Var.Set.inter local_state.rbp_vars
|
|
|> BStd.Var.Set.is_empty
|
|
|> not in
|
|
(card = 3 && has_mem_var && has_rsp_var &&
|
|
(has_rbp_var || has_intermed_rbp_var))
|
|
in
|
|
|
|
let is_pop_expr expr =
|
|
let free_vars = BStd.Exp.free_vars expr in
|
|
let free_x86_regs = Regs.X86_64.map_varset free_vars in
|
|
(match Regs.DwRegOptSet.cardinal free_x86_regs with
|
|
| 2 ->
|
|
let reg = free_x86_regs
|
|
|> Regs.DwRegOptSet.filter
|
|
(fun x -> match x with None -> false | Some _ -> true)
|
|
|> Regs.DwRegOptSet.choose in
|
|
let has_mem_var = BStd.Var.Set.exists
|
|
~f:(fun x -> BStd.Var.name x = "mem")
|
|
free_vars in
|
|
(match reg, has_mem_var with
|
|
| Some dw_var, true when dw_var = Regs.X86_64.rsp -> true
|
|
| _ -> false)
|
|
| _ -> false
|
|
)
|
|
in
|
|
|
|
let is_rbp_expr expr =
|
|
let free_vars = BStd.Exp.free_vars expr in
|
|
let free_x86_regs = Regs.X86_64.map_varset free_vars in
|
|
(match Regs.DwRegOptSet.cardinal free_x86_regs with
|
|
| 1 ->
|
|
let reg = Regs.DwRegOptSet.choose free_x86_regs in
|
|
(match reg with
|
|
| Some dwreg when dwreg = Regs.X86_64.rbp -> true
|
|
| _ -> false)
|
|
| _ -> false)
|
|
in
|
|
|
|
let gather_rbp_intermed_var def cur_state =
|
|
(* If `def` is `some intermed. var <- rbp`, add this information in the
|
|
local state *)
|
|
(match is_rbp_expr @@ BStd.Def.rhs def with
|
|
| true ->
|
|
let lhs_var = BStd.Def.lhs def in
|
|
if (BStd.Var.is_virtual lhs_var
|
|
&& BStd.Var.typ lhs_var = BStd.reg64_t) then
|
|
(
|
|
(* This `def` is actually of the type we want to store. *)
|
|
let n_rbp_vars = BStd.Var.Set.add cur_state.rbp_vars lhs_var in
|
|
{ cur_state with rbp_vars = n_rbp_vars }
|
|
)
|
|
else
|
|
cur_state
|
|
| false -> cur_state
|
|
)
|
|
in
|
|
|
|
let out_rbp, new_state =
|
|
(match cur_rbp with
|
|
| RbpUndef ->
|
|
let cur_state = gather_rbp_intermed_var def local_state in
|
|
(* We assume that an expression is saving %rbp on the stack at the
|
|
address %rip when the current def is an expression of the kind
|
|
`MEM <- F(MEM, %rip, v)` where `v` is either `%rbp` or some
|
|
intermediary variable holding `%rbp`.
|
|
This approach is sound when %rbp is saved using a `push`, but
|
|
probably wrong when saved using a `mov` on some stack-space allocated
|
|
previously (eg. for multiple registers saved at once).
|
|
It would be far better to actually read the position at which `v` is
|
|
saved, but this requires parsing the actual rhs expression, which is
|
|
not easily done: FIXME
|
|
*)
|
|
|
|
let new_rbp =
|
|
if (BStd.Var.name @@ BStd.Def.lhs def = "mem"
|
|
&& is_rbp_save_expr (BStd.Def.rhs def) cur_state)
|
|
then
|
|
(match cur_cfa with
|
|
| RspOffset off ->
|
|
Some (RbpCfaOffset (Int64.mul Int64.minus_one off))
|
|
| _ -> raise UnexpectedRbpSet
|
|
)
|
|
else
|
|
None
|
|
in
|
|
|
|
new_rbp, cur_state
|
|
| RbpCfaOffset offs ->
|
|
(* We go back to RbpUndef when encountering something like a `pop rbp`,
|
|
that is, RBP <- f(RSP, mem) *)
|
|
(match Regs.X86_64.of_var (BStd.Def.lhs def),
|
|
is_pop_expr @@ BStd.Def.rhs def with
|
|
| Some reg, true when reg = Regs.X86_64.rbp ->
|
|
Some RbpUndef, local_state
|
|
| _ -> None, local_state
|
|
)
|
|
)
|
|
in
|
|
|
|
(match out_cfa, out_rbp with
|
|
| None, None -> None
|
|
| Some cfa, None -> Some (cfa, cur_rbp)
|
|
| None, Some rbp -> Some (cur_cfa, rbp)
|
|
| Some cfa, Some rbp -> Some (cfa, rbp)),
|
|
new_state
|
|
|
|
let process_jmp jmp (cur_reg: reg_pos)
|
|
: (reg_pos option) =
|
|
let cur_cfa, cur_rbp = cur_reg in
|
|
let gen_change = match cur_cfa with
|
|
| RspOffset cur_offset -> (fun off ->
|
|
let new_offset = Int64.add cur_offset (Int64.of_int off) in
|
|
Some (RspOffset(new_offset), cur_rbp)
|
|
)
|
|
| _ -> (fun _ -> None)
|
|
in
|
|
|
|
match (BStd.Jmp.kind jmp) with
|
|
| BStd.Call call -> gen_change (-8)
|
|
| BStd.Ret ret -> gen_change (8)
|
|
| _ -> None
|
|
|
|
let process_blk
|
|
next_instr_graph (block_init: reg_pos) blk : (reg_changes_fde * reg_pos) =
|
|
(** Extracts the registers (CFA+RBP) changes of a block. *)
|
|
|
|
let apply_offset cur_addr_opt ((accu:reg_changes_fde), cur_reg, local_state)
|
|
= function
|
|
| None -> (accu, cur_reg, local_state)
|
|
| Some reg_pos ->
|
|
let cur_addr = (match cur_addr_opt with
|
|
| None -> assert false
|
|
| Some x -> to_int64_addr x) in
|
|
(AddrSet.fold (fun n_addr cur_accu ->
|
|
AddrMap.add n_addr reg_pos cur_accu)
|
|
(AddrMap.find cur_addr next_instr_graph)
|
|
accu),
|
|
reg_pos,
|
|
local_state
|
|
in
|
|
|
|
let fold_elt (accu, cur_reg, cur_local_state) elt = match elt with
|
|
| `Def(def) ->
|
|
let new_offset, new_state = process_def cur_local_state def cur_reg in
|
|
apply_offset
|
|
(opt_addr_of def) (accu, cur_reg, new_state) new_offset
|
|
| `Jmp(jmp) ->
|
|
apply_offset
|
|
(opt_addr_of jmp) (accu, cur_reg, cur_local_state)
|
|
@@ process_jmp jmp cur_reg
|
|
| _ -> (accu, cur_reg, cur_local_state)
|
|
in
|
|
|
|
let init_changes = (match opt_addr_of blk with
|
|
| None -> AddrMap.empty
|
|
| Some x ->
|
|
let blk_address = to_int64_addr x in
|
|
AddrMap.singleton blk_address block_init
|
|
) in
|
|
|
|
let empty_local_state = {
|
|
rbp_vars = BStd.Var.Set.empty
|
|
} in
|
|
let elts_seq = BStd.Blk.elts blk in
|
|
let out_reg, end_reg, _ = BStd.Seq.fold elts_seq
|
|
~init:(init_changes, block_init, empty_local_state)
|
|
~f:fold_elt in
|
|
out_reg, end_reg
|
|
|
|
exception Inconsistent of BStd.tid
|
|
|
|
let get_entry_blk graph =
|
|
let entry = BStd.Seq.min_elt (CFG.nodes graph) ~cmp:(fun x y ->
|
|
let ax = opt_addr_of @@ CFG.Node.label x
|
|
and ay = opt_addr_of @@ CFG.Node.label y in
|
|
match ax, ay with
|
|
| None, None -> compare x y
|
|
| Some _, None -> -1
|
|
| None, Some _ -> 1
|
|
| Some ax, Some ay -> compare (to_int64_addr ax) (to_int64_addr ay))
|
|
in
|
|
match entry with
|
|
| None -> assert false
|
|
| Some x -> x
|
|
|
|
let find_last_addr sub =
|
|
(** Finds the maximal instruction address in a subroutine *)
|
|
|
|
let map_opt fl fr merge l r = match l, r with
|
|
| None, None -> None
|
|
| Some x, None -> Some (fl x)
|
|
| None, Some y -> Some (fr y)
|
|
| Some x, Some y -> Some (merge (fl x) (fr y))
|
|
in
|
|
let max_opt_addr_word = map_opt
|
|
(fun x -> x)
|
|
(fun y -> to_int64_addr y)
|
|
max
|
|
in
|
|
let max_opt_addr = map_opt
|
|
(fun x -> x)
|
|
(fun y -> y)
|
|
max
|
|
in
|
|
let max_def cur_max def =
|
|
max_opt_addr_word cur_max (opt_addr_of def)
|
|
in
|
|
|
|
let fold_res =
|
|
BStd.Seq.fold (BStd.Term.enum BStd.blk_t sub)
|
|
~init:None
|
|
~f:(fun cur_max blk ->
|
|
max_opt_addr
|
|
(BStd.Seq.fold (BStd.Term.enum BStd.def_t blk)
|
|
~init:cur_max
|
|
~f:max_def)
|
|
(BStd.Seq.fold (BStd.Term.enum BStd.jmp_t blk)
|
|
~init:cur_max
|
|
~f:max_def)
|
|
)
|
|
in
|
|
match fold_res with
|
|
| None -> Int64.zero
|
|
| Some x -> x
|
|
|
|
let cleanup_fde (fde_changes: reg_changes_fde) : reg_changes_fde =
|
|
(** Cleanup the result of `of_sub`.
|
|
|
|
Merges entries at the same address, propagates track lost *)
|
|
|
|
let fold_one addr reg_change (accu, last_change, lost_track) =
|
|
match reg_change, last_change, lost_track with
|
|
| _, _, true -> (accu, None, lost_track)
|
|
| (CfaLostTrack, _), _, false ->
|
|
(AddrMap.add addr reg_change accu, None, true)
|
|
| reg_change, Some prev_change, false when reg_change = prev_change ->
|
|
(accu, last_change, false)
|
|
| reg_change, _, false ->
|
|
(AddrMap.add addr reg_change accu, Some reg_change, false)
|
|
in
|
|
|
|
match AddrMap.fold fold_one fde_changes (AddrMap.empty, None, false) with
|
|
| out, _, _ -> out
|
|
|
|
let process_sub sub : subroutine_cfa_data =
|
|
(** Extracts the `cfa_changes_fde` of a subroutine *)
|
|
|
|
let cfg = BStd.Sub.to_cfg sub in
|
|
let next_instr_graph = build_next_instr cfg in
|
|
|
|
let first_addr = int64_addr_of sub in
|
|
let last_addr = find_last_addr sub in
|
|
|
|
let initial_cfa_rsp_offset = Int64.of_int 8 in
|
|
|
|
let rec dfs_process
|
|
(sub_changes: (reg_changes_fde * reg_pos) TIdMap.t)
|
|
node
|
|
(entry_offset: reg_pos) =
|
|
(** Processes one block *)
|
|
|
|
let cur_blk = CFG.Node.label node in
|
|
let tid = BStd.Term.tid @@ cur_blk in
|
|
|
|
match (TIdMap.find_opt tid sub_changes) with
|
|
| None ->
|
|
(* Not yet visited: compute the changes *)
|
|
let cur_blk_changes, end_reg =
|
|
process_blk next_instr_graph entry_offset cur_blk in
|
|
let n_sub_changes =
|
|
TIdMap.add tid (cur_blk_changes, entry_offset) sub_changes in
|
|
BStd.Seq.fold (CFG.Node.succs node cfg)
|
|
~f:(fun accu child -> dfs_process accu child end_reg)
|
|
~init:n_sub_changes
|
|
| Some (_, former_entry_offset) ->
|
|
(* Already visited: check that entry values are matching *)
|
|
if entry_offset <> former_entry_offset then
|
|
raise (Inconsistent tid)
|
|
else
|
|
sub_changes
|
|
in
|
|
|
|
let entry_blk = get_entry_blk cfg in
|
|
let initial_offset = (RspOffset initial_cfa_rsp_offset, RbpUndef) in
|
|
let changes_map = dfs_process TIdMap.empty entry_blk initial_offset in
|
|
|
|
let merged_changes = TIdMap.fold
|
|
(fun _ (cfa_changes, _) accu -> AddrMap.union (fun _ v1 v2 ->
|
|
if v1 = v2 then
|
|
Some v1
|
|
else
|
|
assert false)
|
|
cfa_changes accu)
|
|
changes_map
|
|
AddrMap.empty in
|
|
|
|
let reg_changes = cleanup_fde merged_changes in
|
|
|
|
let output = {
|
|
reg_changes_fde = reg_changes ;
|
|
beg_pos = first_addr ;
|
|
end_pos = last_addr ;
|
|
} in
|
|
|
|
output
|
|
|
|
let of_prog prog : subroutine_cfa_map =
|
|
(** Extracts the `cfa_changes` of a program *)
|
|
let fold_step accu sub =
|
|
(try
|
|
let subroutine_data = process_sub sub in
|
|
StrMap.add (BStd.Sub.name sub) subroutine_data accu
|
|
with
|
|
| InvalidSub -> accu
|
|
| Inconsistent tid ->
|
|
Format.eprintf "Inconsistent TId %a in subroutine %s, skipping.@."
|
|
BStd.Tid.pp tid (BStd.Sub.name sub);
|
|
accu
|
|
)
|
|
in
|
|
let subroutines = BStd.Term.enum BStd.sub_t prog in
|
|
BStd.Seq.fold subroutines
|
|
~init:StrMap.empty
|
|
~f:fold_step
|
|
|
|
let of_proj proj : subroutine_cfa_map =
|
|
(** Extracts the `cfa_changes` of a project *)
|
|
let prog = BStd.Project.program proj in
|
|
of_prog prog
|
|
|
|
let clean_lost_track_subs pre_dwarf : subroutine_cfa_map =
|
|
(** Removes the subroutines on which we lost track from [pre_dwarf] *)
|
|
let sub_lost_track sub_name (sub: subroutine_cfa_data) =
|
|
not @@ AddrMap.exists (fun addr pos ->
|
|
let cfa_pos, _ = pos in
|
|
(match cfa_pos with
|
|
| RspOffset _ | RbpOffset _ -> false
|
|
| CfaLostTrack -> true))
|
|
sub.reg_changes_fde
|
|
in
|
|
StrMap.filter sub_lost_track pre_dwarf
|