62 lines
2.4 KiB
OCaml
62 lines
2.4 KiB
OCaml
(**************************************************************************)
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(* *)
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(* Heptagon *)
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(* *)
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(* Author : Marc Pouzet *)
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(* Organization : Demons, LRI, University of Paris-Sud, Orsay *)
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(* *)
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(**************************************************************************)
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(** Remove implicit array's deep copy. If ever some p = e with p of type array still exist,
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they are only used as reference to the array, no copy is implied :
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array assignation after [scalarize] is pointer wise assignation *)
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open Misc
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open Obc
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open Obc_utils
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open Obc_mapfold
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(** fresh Afor from 0 to [size] with [body] a function from [var_ident] (the iterator) to [act] list *)
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let fresh_for size body =
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let i = Idents.gen_var "scalarize" "i" in
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let id = mk_var_dec i Initial.tint in
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let ei = mk_evar_int i in
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Afor (id, Initial.mk_static_int 0, size, mk_block (body ei))
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let act funs () a = match a with
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| Aassgn (p,e) ->
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(match e.e_ty with
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| Types.Tarray (t, size) ->
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(* a reference (alias) to the array, since we could have a full expression *)
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let array_ref = Idents.gen_var "scalarize" "a_ref" in
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let vd_array_ref = mk_var_dec array_ref (Types.Tmutable p.pat_ty) in
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(* reference initialization *)
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let pat_array_ref = mk_pattern ~loc:e.e_loc p.pat_ty (Lvar array_ref) in
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let init_array_ref = Aassgn (pat_array_ref, e) in
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(* the copy loop *)
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let array_ref_i i = mk_pattern_exp t (Larray (pat_array_ref, i)) in
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let p_i i = mk_pattern t (Larray (p, i)) in
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let copy_i i =
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(* recursive call to deal with multidimensional arrays (go deeper) *)
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let a = Aassgn (p_i i, array_ref_i i) in
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let a, _ = act_it funs () a in
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[a]
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in
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let copy_array = fresh_for size copy_i in
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(* resulting block *)
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let block = mk_block ~locals:[vd_array_ref] [init_array_ref; copy_array] in
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Ablock block, ()
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| _ -> raise Errors.Fallback
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)
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| _ -> raise Errors.Fallback
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let program p =
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let p, _ = program_it { defaults with act = act } () p in
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p
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