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Encode tag and iso types at dwarf level. Can't decode them yet.
This commit is contained in:
Graydon Hoare
parent
7ea416f4c3
commit
fb3e2fa4bf
@ -745,8 +745,6 @@ type dw_rust_type =
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| DW_RUST_chan
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| DW_RUST_port
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| DW_RUST_task
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| DW_RUST_tag
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| DW_RUST_iso
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| DW_RUST_type
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| DW_RUST_native
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;;
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@ -759,10 +757,8 @@ let dw_rust_type_to_int (pt:dw_rust_type) : int =
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| DW_RUST_chan -> 0x4
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| DW_RUST_port -> 0x5
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| DW_RUST_task -> 0x6
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| DW_RUST_tag -> 0x7
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| DW_RUST_iso -> 0x8
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| DW_RUST_type -> 0x9
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| DW_RUST_native -> 0xa
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| DW_RUST_type -> 0x7
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| DW_RUST_native -> 0x8
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;;
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let dw_rust_type_of_int (i:int) : dw_rust_type =
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@ -773,10 +769,8 @@ let dw_rust_type_of_int (i:int) : dw_rust_type =
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| 0x4 -> DW_RUST_chan
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| 0x5 -> DW_RUST_port
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| 0x6 -> DW_RUST_task
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| 0x7 -> DW_RUST_tag
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| 0x8 -> DW_RUST_iso
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| 0x9 -> DW_RUST_type
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| 0xa -> DW_RUST_native
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| 0x7 -> DW_RUST_type
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| 0x8 -> DW_RUST_native
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| _ -> bug () "bad DWARF rust-pointer-type code: %d" i
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;;
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@ -1344,6 +1338,21 @@ let (abbrev_struct_type_member:abbrev) =
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|])
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;;
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let (abbrev_variant_part:abbrev) =
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(DW_TAG_variant_part, DW_CHILDREN_yes,
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[|
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(DW_AT_discr, DW_FORM_ref_addr)
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|])
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;;
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let (abbrev_variant:abbrev) =
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(DW_TAG_variant, DW_CHILDREN_yes,
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[|
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(DW_AT_discr_value, DW_FORM_udata)
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|])
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;;
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let (abbrev_subroutine_type:abbrev) =
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(DW_TAG_subroutine_type, DW_CHILDREN_yes,
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[|
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@ -1428,6 +1437,8 @@ let dwarf_visitor
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| Il.Bits64 -> TY_i64
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in
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let iso_stack = Stack.create () in
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let path_name _ = Fmt.fmt_to_str Ast.fmt_name (Walk.path_to_name path) in
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let (abbrev_table:(abbrev, int) Hashtbl.t) = Hashtbl.create 0 in
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@ -1720,6 +1731,12 @@ let dwarf_visitor
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ref_addr_for_fix fix
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in
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let tup ttup =
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record (Array.mapi (fun i s ->
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("_" ^ (string_of_int i), s))
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ttup)
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in
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let string_type _ =
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(*
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* Strings, like vecs, are &[rc,alloc,fill,data...]
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@ -1912,6 +1929,117 @@ let dwarf_visitor
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ref_addr_for_fix fix
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in
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let tag_type fix_opt ttag =
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(*
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* Tag-encoding is a bit complex. It's based on the pascal model.
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*
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* You have a structure (DW_TAG_structure_type) with 2 fields:
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*
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* 0 : the discriminant (type uint)
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* 1 : the variant-part of the structure (DW_TAG_variant_part)
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* with DW_AT_discr pointing to the disctiminant, and kids:
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* 0 : variant 0 (DW_TAG_variant) with DW_AT_discr_value 0
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* (with a tuple-type child)
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* 1 : variant 1 ...
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* ...
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* N : variant N (DW_TAG_variant) with DW_AT_discr_value N
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*
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* Curiously, DW_TAG_union_type doesn't seem to play into it.
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* I'm a bit surprised by that!
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*)
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let rty = referent_type abi (Ast.TY_tag ttag) in
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let rty_sz = Il.referent_ty_size abi.Abi.abi_word_bits in
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let rtys =
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match rty with
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Il.StructTy rtys -> rtys
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| _ -> bug () "tag type became non-struct referent_ty"
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in
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let outer_structure_fix =
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match fix_opt with
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None -> new_fixup "tag type"
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| Some f -> f
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in
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let outer_structure_die =
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DEF (outer_structure_fix, SEQ [|
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uleb (get_abbrev_code abbrev_struct_type);
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(* DW_AT_byte_size: DW_FORM_block4 *)
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size_block4 (rty_sz rty) false
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|])
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in
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let discr_fix = new_fixup "tag discriminant" in
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let discr_die =
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DEF (discr_fix, SEQ [|
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uleb (get_abbrev_code abbrev_struct_type_member);
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(* DW_AT_name: DW_FORM_string *)
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ZSTRING "tag";
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(* DW_AT_type: DW_FORM_ref_addr *)
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(ref_slot_die (interior_slot Ast.TY_uint));
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(* DW_AT_mutable: DW_FORM_flag *)
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BYTE 0;
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(* DW_AT_data_member_location: DW_FORM_block4 *)
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size_block4
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(Il.get_element_offset word_bits rtys 0)
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true;
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(* DW_AT_byte_size: DW_FORM_block4 *)
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size_block4 (rty_sz rtys.(0)) false |]);
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in
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let variant_part_die =
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SEQ [|
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uleb (get_abbrev_code abbrev_variant_part);
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(* DW_AT_discr: DW_FORM_ref_addr *)
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(dw_form_ref_addr discr_fix)
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|]
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in
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let emit_variant i (*name*)_ ttup =
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(* FIXME: Possibly use a DW_TAG_enumeration_type here? *)
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(* Tag-names aren't getting encoded; I'm not sure if that's a
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* problem. Might be. *)
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emit_die (SEQ [|
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uleb (get_abbrev_code abbrev_variant);
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(* DW_AT_discr_value: DW_FORM_udata *)
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uleb i;
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|]);
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ignore (tup ttup);
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emit_null_die ();
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in
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emit_die outer_structure_die;
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emit_die discr_die;
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emit_die variant_part_die;
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let tag_keys = sorted_htab_keys ttag in
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Array.iteri
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(fun i k -> emit_variant i k (Hashtbl.find ttag k))
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tag_keys;
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emit_null_die (); (* end variant-part *)
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emit_null_die (); (* end outer struct *)
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ref_addr_for_fix outer_structure_fix
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in
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let iso_type tiso =
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let iso_fixups =
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Array.map
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(fun _ -> new_fixup "iso-member tag type")
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tiso.Ast.iso_group
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in
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Stack.push iso_fixups iso_stack;
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let tag_dies =
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Array.mapi
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(fun i fix ->
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tag_type (Some fix) tiso.Ast.iso_group.(i))
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iso_fixups
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in
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ignore (Stack.pop iso_stack);
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tag_dies.(tiso.Ast.iso_index)
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in
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let idx_type i =
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ref_addr_for_fix (Stack.top iso_stack).(i)
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in
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match ty with
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Ast.TY_nil -> unspecified_struct DW_RUST_nil
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| Ast.TY_bool -> base ("bool", DW_ATE_boolean, 1)
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@ -1928,18 +2056,15 @@ let dwarf_visitor
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| Ast.TY_char -> base ("char", DW_ATE_unsigned_char, 4)
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| Ast.TY_str -> string_type ()
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| Ast.TY_rec trec -> record trec
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| Ast.TY_tup ttup ->
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record (Array.mapi (fun i s ->
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("_" ^ (string_of_int i), s))
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ttup)
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| Ast.TY_tup ttup -> tup ttup
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| Ast.TY_tag ttag -> tag_type None ttag
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| Ast.TY_iso tiso -> iso_type tiso
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| Ast.TY_idx i -> idx_type i
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| Ast.TY_vec s -> unspecified_ptr_with_ref_slot DW_RUST_vec s
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| Ast.TY_chan t -> unspecified_ptr_with_ref_ty DW_RUST_chan t
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| Ast.TY_port t -> unspecified_ptr_with_ref_ty DW_RUST_port t
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| Ast.TY_task -> unspecified_ptr DW_RUST_task
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| Ast.TY_fn fn -> fn_type fn
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| Ast.TY_tag _ -> unspecified_ptr DW_RUST_tag
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| Ast.TY_iso _ -> unspecified_ptr DW_RUST_iso
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| Ast.TY_type -> unspecified_ptr DW_RUST_type
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| Ast.TY_native i -> native_ptr_type i
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| Ast.TY_param p -> rust_type_param p
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