1236 lines
41 KiB
Rust
1236 lines
41 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use core::prelude::*;
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use c = metadata::common;
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use cstore = metadata::cstore;
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use driver::session::Session;
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use e = metadata::encoder;
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use metadata::decoder;
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use metadata::encoder;
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use metadata::tydecode;
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use metadata::tydecode::{DefIdSource, NominalType, TypeWithId, TypeParameter};
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use metadata::tyencode;
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use middle::freevars::freevar_entry;
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use middle::typeck::{method_origin, method_map_entry, vtable_res};
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use middle::typeck::{vtable_origin};
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use middle::{ty, typeck};
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use middle;
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use util::ppaux::ty_to_str;
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use core::{dvec, io, option, vec};
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use std::ebml::reader::get_doc;
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use std::ebml::reader;
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use std::ebml::writer::Encoder;
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use std::ebml;
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use std::map::HashMap;
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use std::prettyprint;
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use std::serialize;
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use std::serialize::{Encodable, EncoderHelpers, DecoderHelpers};
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use std::serialize::Decodable;
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use syntax::ast;
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use syntax::ast_map;
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use syntax::ast_util;
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use syntax::codemap::span;
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use syntax::codemap;
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use syntax::diagnostic;
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use syntax::fold::*;
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use syntax::fold;
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use syntax::parse;
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use syntax::print::pprust;
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use syntax::visit;
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use syntax;
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use writer = std::ebml::writer;
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export maps;
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export encode_inlined_item;
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export decode_inlined_item;
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// Auxiliary maps of things to be encoded
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type maps = {
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mutbl_map: middle::borrowck::mutbl_map,
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root_map: middle::borrowck::root_map,
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last_use_map: middle::liveness::last_use_map,
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method_map: middle::typeck::method_map,
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vtable_map: middle::typeck::vtable_map,
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write_guard_map: middle::borrowck::write_guard_map,
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};
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type decode_ctxt = @{
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cdata: cstore::crate_metadata,
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tcx: ty::ctxt,
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maps: maps
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};
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type extended_decode_ctxt_ = {
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dcx: decode_ctxt,
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from_id_range: ast_util::id_range,
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to_id_range: ast_util::id_range
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};
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enum extended_decode_ctxt {
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extended_decode_ctxt_(@extended_decode_ctxt_)
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}
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trait tr {
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fn tr(xcx: extended_decode_ctxt) -> self;
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}
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trait tr_intern {
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fn tr_intern(xcx: extended_decode_ctxt) -> ast::def_id;
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}
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// ______________________________________________________________________
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// Top-level methods.
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fn encode_inlined_item(ecx: @e::encode_ctxt,
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ebml_w: writer::Encoder,
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path: &[ast_map::path_elt],
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ii: ast::inlined_item,
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maps: maps) {
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debug!("> Encoding inlined item: %s::%s (%u)",
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ast_map::path_to_str(path, ecx.tcx.sess.parse_sess.interner),
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ecx.tcx.sess.str_of(ii.ident()),
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ebml_w.writer.tell());
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let id_range = ast_util::compute_id_range_for_inlined_item(ii);
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do ebml_w.wr_tag(c::tag_ast as uint) {
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id_range.encode(&ebml_w);
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encode_ast(ebml_w, simplify_ast(ii));
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encode_side_tables_for_ii(ecx, maps, ebml_w, ii);
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}
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debug!("< Encoded inlined fn: %s::%s (%u)",
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ast_map::path_to_str(path, ecx.tcx.sess.parse_sess.interner),
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ecx.tcx.sess.str_of(ii.ident()),
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ebml_w.writer.tell());
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}
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fn decode_inlined_item(cdata: cstore::crate_metadata,
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tcx: ty::ctxt,
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maps: maps,
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+path: ast_map::path,
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par_doc: ebml::Doc) -> Option<ast::inlined_item> {
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let dcx = @{cdata: cdata, tcx: tcx, maps: maps};
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match par_doc.opt_child(c::tag_ast) {
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None => None,
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Some(ast_doc) => {
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debug!("> Decoding inlined fn: %s::?",
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ast_map::path_to_str(path, tcx.sess.parse_sess.interner));
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let ast_dsr = &reader::Decoder(ast_doc);
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let from_id_range = Decodable::decode(ast_dsr);
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let to_id_range = reserve_id_range(dcx.tcx.sess, from_id_range);
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let xcx = extended_decode_ctxt_(@{dcx: dcx,
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from_id_range: from_id_range,
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to_id_range: to_id_range});
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let raw_ii = decode_ast(ast_doc);
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let ii = renumber_ast(xcx, raw_ii);
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debug!("Fn named: %s", tcx.sess.str_of(ii.ident()));
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debug!("< Decoded inlined fn: %s::%s",
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ast_map::path_to_str(path, tcx.sess.parse_sess.interner),
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tcx.sess.str_of(ii.ident()));
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ast_map::map_decoded_item(tcx.sess.diagnostic(),
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dcx.tcx.items, path, ii);
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decode_side_tables(xcx, ast_doc);
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match ii {
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ast::ii_item(i) => {
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debug!(">>> DECODED ITEM >>>\n%s\n<<< DECODED ITEM <<<",
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syntax::print::pprust::item_to_str(i, tcx.sess.intr()));
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}
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_ => { }
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}
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Some(ii)
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}
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}
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}
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// ______________________________________________________________________
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// Enumerating the IDs which appear in an AST
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fn reserve_id_range(sess: Session,
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from_id_range: ast_util::id_range) -> ast_util::id_range {
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// Handle the case of an empty range:
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if ast_util::empty(from_id_range) { return from_id_range; }
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let cnt = from_id_range.max - from_id_range.min;
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let to_id_min = sess.parse_sess.next_id;
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let to_id_max = sess.parse_sess.next_id + cnt;
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sess.parse_sess.next_id = to_id_max;
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ast_util::id_range { min: to_id_min, max: to_id_min }
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}
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impl extended_decode_ctxt {
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fn tr_id(id: ast::node_id) -> ast::node_id {
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/*!
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*
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* Translates an internal id, meaning a node id that is known
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* to refer to some part of the item currently being inlined,
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* such as a local variable or argument. All naked node-ids
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* that appear in types have this property, since if something
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* might refer to an external item we would use a def-id to
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* allow for the possibility that the item resides in another
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* crate.
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*/
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// from_id_range should be non-empty
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assert !ast_util::empty(self.from_id_range);
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(id - self.from_id_range.min + self.to_id_range.min)
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}
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fn tr_def_id(did: ast::def_id) -> ast::def_id {
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/*!
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*
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* Translates an EXTERNAL def-id, converting the crate number
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* from the one used in the encoded data to the current crate
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* numbers.. By external, I mean that it be translated to a
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* reference to the item in its original crate, as opposed to
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* being translated to a reference to the inlined version of
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* the item. This is typically, but not always, what you
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* want, because most def-ids refer to external things like
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* types or other fns that may or may not be inlined. Note
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* that even when the inlined function is referencing itself
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* recursively, we would want `tr_def_id` for that
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* reference--- conceptually the function calls the original,
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* non-inlined version, and trans deals with linking that
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* recursive call to the inlined copy.
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*
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* However, there are a *few* cases where def-ids are used but
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* we know that the thing being referenced is in fact *internal*
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* to the item being inlined. In those cases, you should use
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* `tr_intern_def_id()` below.
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*/
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decoder::translate_def_id(self.dcx.cdata, did)
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}
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fn tr_intern_def_id(did: ast::def_id) -> ast::def_id {
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/*!
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*
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* Translates an INTERNAL def-id, meaning a def-id that is
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* known to refer to some part of the item currently being
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* inlined. In that case, we want to convert the def-id to
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* refer to the current crate and to the new, inlined node-id.
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*/
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assert did.crate == ast::local_crate;
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ast::def_id { crate: ast::local_crate, node: self.tr_id(did.node) }
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}
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fn tr_span(_span: span) -> span {
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ast_util::dummy_sp() // FIXME (#1972): handle span properly
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}
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}
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impl ast::def_id: tr_intern {
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fn tr_intern(xcx: extended_decode_ctxt) -> ast::def_id {
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xcx.tr_intern_def_id(self)
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}
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}
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impl ast::def_id: tr {
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fn tr(xcx: extended_decode_ctxt) -> ast::def_id {
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xcx.tr_def_id(self)
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}
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}
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impl span: tr {
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fn tr(xcx: extended_decode_ctxt) -> span {
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xcx.tr_span(self)
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}
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}
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trait def_id_encoder_helpers {
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fn emit_def_id(did: ast::def_id);
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}
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impl<S: serialize::Encoder> S: def_id_encoder_helpers {
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fn emit_def_id(did: ast::def_id) {
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did.encode(&self)
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}
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}
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trait def_id_decoder_helpers {
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fn read_def_id(xcx: extended_decode_ctxt) -> ast::def_id;
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}
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impl<D: serialize::Decoder> D: def_id_decoder_helpers {
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fn read_def_id(xcx: extended_decode_ctxt) -> ast::def_id {
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let did: ast::def_id = Decodable::decode(&self);
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did.tr(xcx)
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}
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}
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// ______________________________________________________________________
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// Encoding and decoding the AST itself
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//
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// The hard work is done by an autogenerated module astencode_gen. To
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// regenerate astencode_gen, run src/etc/gen-astencode. It will
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// replace astencode_gen with a dummy file and regenerate its
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// contents. If you get compile errors, the dummy file
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// remains---resolve the errors and then rerun astencode_gen.
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// Annoying, I know, but hopefully only temporary.
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//
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// When decoding, we have to renumber the AST so that the node ids that
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// appear within are disjoint from the node ids in our existing ASTs.
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// We also have to adjust the spans: for now we just insert a dummy span,
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// but eventually we should add entries to the local codemap as required.
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fn encode_ast(ebml_w: writer::Encoder, item: ast::inlined_item) {
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do ebml_w.wr_tag(c::tag_tree as uint) {
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item.encode(&ebml_w)
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}
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}
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// Produces a simplified copy of the AST which does not include things
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// that we do not need to or do not want to export. For example, we
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// do not include any nested items: if these nested items are to be
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// inlined, their AST will be exported separately (this only makes
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// sense because, in Rust, nested items are independent except for
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// their visibility).
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//
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// As it happens, trans relies on the fact that we do not export
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// nested items, as otherwise it would get confused when translating
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// inlined items.
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fn simplify_ast(ii: ast::inlined_item) -> ast::inlined_item {
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fn drop_nested_items(blk: ast::blk_, fld: fold::ast_fold) -> ast::blk_ {
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let stmts_sans_items = do blk.stmts.filtered |stmt| {
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match stmt.node {
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ast::stmt_expr(_, _) | ast::stmt_semi(_, _) |
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ast::stmt_decl(@ast::spanned { node: ast::decl_local(_),
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span: _}, _) => true,
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ast::stmt_decl(@ast::spanned { node: ast::decl_item(_),
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span: _}, _) => false,
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ast::stmt_mac(*) => fail ~"unexpanded macro in astencode"
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}
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};
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let blk_sans_items = ast::blk_ {
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view_items: ~[], // I don't know if we need the view_items here,
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// but it doesn't break tests!
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stmts: stmts_sans_items,
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expr: blk.expr,
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id: blk.id,
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rules: blk.rules
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};
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fold::noop_fold_block(blk_sans_items, fld)
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}
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let fld = fold::make_fold(@fold::AstFoldFns {
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fold_block: fold::wrap(drop_nested_items),
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.. *fold::default_ast_fold()
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});
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match ii {
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ast::ii_item(i) => {
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ast::ii_item(fld.fold_item(i).get()) //hack: we're not dropping items
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}
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ast::ii_method(d, m) => {
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ast::ii_method(d, fld.fold_method(m))
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}
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ast::ii_foreign(i) => {
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ast::ii_foreign(fld.fold_foreign_item(i))
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}
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ast::ii_dtor(ref dtor, nm, ref tps, parent_id) => {
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let dtor_body = fld.fold_block((*dtor).node.body);
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ast::ii_dtor(
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ast::spanned {
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node: ast::struct_dtor_ { body: dtor_body,
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.. /*bad*/copy (*dtor).node },
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.. (/*bad*/copy *dtor) },
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nm, /*bad*/copy *tps, parent_id)
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}
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}
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}
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fn decode_ast(par_doc: ebml::Doc) -> ast::inlined_item {
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let chi_doc = par_doc[c::tag_tree as uint];
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let d = &reader::Decoder(chi_doc);
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Decodable::decode(d)
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}
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fn renumber_ast(xcx: extended_decode_ctxt, ii: ast::inlined_item)
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-> ast::inlined_item {
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let fld = fold::make_fold(@fold::AstFoldFns{
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new_id: |a| xcx.tr_id(a),
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new_span: |a| xcx.tr_span(a),
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.. *fold::default_ast_fold()
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});
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match ii {
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ast::ii_item(i) => {
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ast::ii_item(fld.fold_item(i).get())
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}
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ast::ii_method(d, m) => {
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ast::ii_method(xcx.tr_def_id(d), fld.fold_method(m))
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}
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ast::ii_foreign(i) => {
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ast::ii_foreign(fld.fold_foreign_item(i))
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}
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ast::ii_dtor(ref dtor, nm, ref tps, parent_id) => {
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let dtor_body = fld.fold_block((*dtor).node.body);
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let dtor_attrs = fld.fold_attributes(/*bad*/copy (*dtor).node.attrs);
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let new_params = fold::fold_ty_params(/*bad*/copy *tps, fld);
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let dtor_id = fld.new_id((*dtor).node.id);
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let new_parent = xcx.tr_def_id(parent_id);
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let new_self = fld.new_id((*dtor).node.self_id);
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ast::ii_dtor(
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ast::spanned {
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node: ast::struct_dtor_ { id: dtor_id,
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attrs: dtor_attrs,
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self_id: new_self,
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body: dtor_body },
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.. (/*bad*/copy *dtor)
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},
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nm, new_params, new_parent)
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}
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}
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}
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// ______________________________________________________________________
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// Encoding and decoding of ast::def
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fn encode_def(ebml_w: writer::Encoder, def: ast::def) {
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def.encode(&ebml_w)
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}
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fn decode_def(xcx: extended_decode_ctxt, doc: ebml::Doc) -> ast::def {
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let dsr = &reader::Decoder(doc);
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let def: ast::def = Decodable::decode(dsr);
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def.tr(xcx)
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}
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impl ast::def: tr {
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fn tr(xcx: extended_decode_ctxt) -> ast::def {
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match self {
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ast::def_fn(did, p) => { ast::def_fn(did.tr(xcx), p) }
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ast::def_static_method(did, did2_opt, p) => {
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ast::def_static_method(did.tr(xcx),
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did2_opt.map(|did2| did2.tr(xcx)),
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p)
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}
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ast::def_self_ty(nid) => { ast::def_self_ty(xcx.tr_id(nid)) }
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ast::def_self(nid, i) => { ast::def_self(xcx.tr_id(nid), i) }
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ast::def_mod(did) => { ast::def_mod(did.tr(xcx)) }
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ast::def_foreign_mod(did) => { ast::def_foreign_mod(did.tr(xcx)) }
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ast::def_const(did) => { ast::def_const(did.tr(xcx)) }
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ast::def_arg(nid, m, b) => { ast::def_arg(xcx.tr_id(nid), m, b) }
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ast::def_local(nid, b) => { ast::def_local(xcx.tr_id(nid), b) }
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ast::def_variant(e_did, v_did) => {
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ast::def_variant(e_did.tr(xcx), v_did.tr(xcx))
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}
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ast::def_ty(did) => ast::def_ty(did.tr(xcx)),
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ast::def_prim_ty(p) => ast::def_prim_ty(p),
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ast::def_ty_param(did, v) => ast::def_ty_param(did.tr(xcx), v),
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ast::def_binding(nid, bm) => ast::def_binding(xcx.tr_id(nid), bm),
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ast::def_use(did) => ast::def_use(did.tr(xcx)),
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ast::def_upvar(nid1, def, nid2, nid3) => {
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ast::def_upvar(xcx.tr_id(nid1),
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@(*def).tr(xcx),
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xcx.tr_id(nid2),
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xcx.tr_id(nid3))
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}
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ast::def_struct(did) => {
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ast::def_struct(did.tr(xcx))
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}
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ast::def_region(nid) => ast::def_region(xcx.tr_id(nid)),
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ast::def_typaram_binder(nid) => {
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ast::def_typaram_binder(xcx.tr_id(nid))
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}
|
|
ast::def_label(nid) => ast::def_label(xcx.tr_id(nid))
|
|
}
|
|
}
|
|
}
|
|
|
|
// ______________________________________________________________________
|
|
// Encoding and decoding of adjustment information
|
|
|
|
impl ty::AutoAdjustment: tr {
|
|
fn tr(xcx: extended_decode_ctxt) -> ty::AutoAdjustment {
|
|
ty::AutoAdjustment {
|
|
autoderefs: self.autoderefs,
|
|
autoref: self.autoref.map(|ar| ar.tr(xcx)),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl ty::AutoRef: tr {
|
|
fn tr(xcx: extended_decode_ctxt) -> ty::AutoRef {
|
|
ty::AutoRef {
|
|
kind: self.kind,
|
|
region: self.region.tr(xcx),
|
|
mutbl: self.mutbl,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl ty::Region: tr {
|
|
fn tr(xcx: extended_decode_ctxt) -> ty::Region {
|
|
match self {
|
|
ty::re_bound(br) => ty::re_bound(br.tr(xcx)),
|
|
ty::re_free(id, br) => ty::re_free(xcx.tr_id(id), br.tr(xcx)),
|
|
ty::re_scope(id) => ty::re_scope(xcx.tr_id(id)),
|
|
ty::re_static | ty::re_infer(*) => self,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl ty::bound_region: tr {
|
|
fn tr(xcx: extended_decode_ctxt) -> ty::bound_region {
|
|
match self {
|
|
ty::br_anon(_) | ty::br_named(_) | ty::br_self |
|
|
ty::br_fresh(_) => self,
|
|
ty::br_cap_avoid(id, br) => ty::br_cap_avoid(xcx.tr_id(id),
|
|
@br.tr(xcx))
|
|
}
|
|
}
|
|
}
|
|
|
|
// ______________________________________________________________________
|
|
// Encoding and decoding of freevar information
|
|
|
|
fn encode_freevar_entry(ebml_w: writer::Encoder, fv: @freevar_entry) {
|
|
(*fv).encode(&ebml_w)
|
|
}
|
|
|
|
trait ebml_decoder_helper {
|
|
fn read_freevar_entry(xcx: extended_decode_ctxt) -> freevar_entry;
|
|
}
|
|
|
|
impl reader::Decoder: ebml_decoder_helper {
|
|
fn read_freevar_entry(xcx: extended_decode_ctxt) -> freevar_entry {
|
|
let fv: freevar_entry = Decodable::decode(&self);
|
|
fv.tr(xcx)
|
|
}
|
|
}
|
|
|
|
impl freevar_entry: tr {
|
|
fn tr(xcx: extended_decode_ctxt) -> freevar_entry {
|
|
freevar_entry {
|
|
def: self.def.tr(xcx),
|
|
span: self.span.tr(xcx),
|
|
}
|
|
}
|
|
}
|
|
|
|
// ______________________________________________________________________
|
|
// Encoding and decoding of method_map_entry
|
|
|
|
trait read_method_map_entry_helper {
|
|
fn read_method_map_entry(xcx: extended_decode_ctxt) -> method_map_entry;
|
|
}
|
|
|
|
fn encode_method_map_entry(ecx: @e::encode_ctxt,
|
|
ebml_w: writer::Encoder,
|
|
mme: method_map_entry) {
|
|
do ebml_w.emit_rec {
|
|
do ebml_w.emit_field(~"self_arg", 0u) {
|
|
ebml_w.emit_arg(ecx, mme.self_arg);
|
|
}
|
|
do ebml_w.emit_field(~"explicit_self", 2u) {
|
|
mme.explicit_self.encode(&ebml_w);
|
|
}
|
|
do ebml_w.emit_field(~"origin", 1u) {
|
|
mme.origin.encode(&ebml_w);
|
|
}
|
|
}
|
|
}
|
|
|
|
impl reader::Decoder: read_method_map_entry_helper {
|
|
fn read_method_map_entry(xcx: extended_decode_ctxt) -> method_map_entry {
|
|
do self.read_rec {
|
|
method_map_entry {
|
|
self_arg: self.read_field(~"self_arg", 0u, || {
|
|
self.read_arg(xcx)
|
|
}),
|
|
explicit_self: self.read_field(~"explicit_self", 2u, || {
|
|
let self_type: ast::self_ty_ = Decodable::decode(&self);
|
|
self_type
|
|
}),
|
|
origin: self.read_field(~"origin", 1u, || {
|
|
let method_origin: method_origin =
|
|
Decodable::decode(&self);
|
|
method_origin.tr(xcx)
|
|
}),
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl method_origin: tr {
|
|
fn tr(xcx: extended_decode_ctxt) -> method_origin {
|
|
match self {
|
|
typeck::method_static(did) => {
|
|
typeck::method_static(did.tr(xcx))
|
|
}
|
|
typeck::method_param(ref mp) => {
|
|
typeck::method_param(
|
|
typeck::method_param {
|
|
trait_id: mp.trait_id.tr(xcx),
|
|
.. *mp
|
|
}
|
|
)
|
|
}
|
|
typeck::method_trait(did, m, vstore) => {
|
|
typeck::method_trait(did.tr(xcx), m, vstore)
|
|
}
|
|
typeck::method_self(did, m) => {
|
|
typeck::method_self(did.tr(xcx), m)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// ______________________________________________________________________
|
|
// Encoding and decoding vtable_res
|
|
|
|
fn encode_vtable_res(ecx: @e::encode_ctxt,
|
|
ebml_w: writer::Encoder,
|
|
dr: typeck::vtable_res) {
|
|
// can't autogenerate this code because automatic code of
|
|
// ty::t doesn't work, and there is no way (atm) to have
|
|
// hand-written encoding routines combine with auto-generated
|
|
// ones. perhaps we should fix this.
|
|
do ebml_w.emit_from_vec(*dr) |vtable_origin| {
|
|
encode_vtable_origin(ecx, ebml_w, *vtable_origin)
|
|
}
|
|
}
|
|
|
|
fn encode_vtable_origin(ecx: @e::encode_ctxt,
|
|
ebml_w: writer::Encoder,
|
|
vtable_origin: typeck::vtable_origin) {
|
|
do ebml_w.emit_enum(~"vtable_origin") {
|
|
match /*bad*/copy vtable_origin {
|
|
typeck::vtable_static(def_id, tys, vtable_res) => {
|
|
do ebml_w.emit_enum_variant(~"vtable_static", 0u, 3u) {
|
|
do ebml_w.emit_enum_variant_arg(0u) {
|
|
ebml_w.emit_def_id(def_id)
|
|
}
|
|
do ebml_w.emit_enum_variant_arg(1u) {
|
|
ebml_w.emit_tys(ecx, /*bad*/copy tys);
|
|
}
|
|
do ebml_w.emit_enum_variant_arg(2u) {
|
|
encode_vtable_res(ecx, ebml_w, vtable_res);
|
|
}
|
|
}
|
|
}
|
|
typeck::vtable_param(pn, bn) => {
|
|
do ebml_w.emit_enum_variant(~"vtable_param", 1u, 2u) {
|
|
do ebml_w.emit_enum_variant_arg(0u) {
|
|
ebml_w.emit_uint(pn);
|
|
}
|
|
do ebml_w.emit_enum_variant_arg(1u) {
|
|
ebml_w.emit_uint(bn);
|
|
}
|
|
}
|
|
}
|
|
typeck::vtable_trait(def_id, tys) => {
|
|
do ebml_w.emit_enum_variant(~"vtable_trait", 1u, 3u) {
|
|
do ebml_w.emit_enum_variant_arg(0u) {
|
|
ebml_w.emit_def_id(def_id)
|
|
}
|
|
do ebml_w.emit_enum_variant_arg(1u) {
|
|
ebml_w.emit_tys(ecx, /*bad*/copy tys);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
trait vtable_decoder_helpers {
|
|
fn read_vtable_res(xcx: extended_decode_ctxt) -> typeck::vtable_res;
|
|
fn read_vtable_origin(xcx: extended_decode_ctxt) -> typeck::vtable_origin;
|
|
}
|
|
|
|
impl reader::Decoder: vtable_decoder_helpers {
|
|
fn read_vtable_res(xcx: extended_decode_ctxt) -> typeck::vtable_res {
|
|
@self.read_to_vec(|| self.read_vtable_origin(xcx) )
|
|
}
|
|
|
|
fn read_vtable_origin(xcx: extended_decode_ctxt)
|
|
-> typeck::vtable_origin {
|
|
do self.read_enum(~"vtable_origin") {
|
|
do self.read_enum_variant |i| {
|
|
match i {
|
|
0 => {
|
|
typeck::vtable_static(
|
|
do self.read_enum_variant_arg(0u) {
|
|
self.read_def_id(xcx)
|
|
},
|
|
do self.read_enum_variant_arg(1u) {
|
|
self.read_tys(xcx)
|
|
},
|
|
do self.read_enum_variant_arg(2u) {
|
|
self.read_vtable_res(xcx)
|
|
}
|
|
)
|
|
}
|
|
1 => {
|
|
typeck::vtable_param(
|
|
do self.read_enum_variant_arg(0u) {
|
|
self.read_uint()
|
|
},
|
|
do self.read_enum_variant_arg(1u) {
|
|
self.read_uint()
|
|
}
|
|
)
|
|
}
|
|
2 => {
|
|
typeck::vtable_trait(
|
|
do self.read_enum_variant_arg(0u) {
|
|
self.read_def_id(xcx)
|
|
},
|
|
do self.read_enum_variant_arg(1u) {
|
|
self.read_tys(xcx)
|
|
}
|
|
)
|
|
}
|
|
// hard to avoid - user input
|
|
_ => fail ~"bad enum variant"
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// ______________________________________________________________________
|
|
// Encoding and decoding the side tables
|
|
|
|
trait get_ty_str_ctxt {
|
|
fn ty_str_ctxt() -> @tyencode::ctxt;
|
|
}
|
|
|
|
impl @e::encode_ctxt: get_ty_str_ctxt {
|
|
fn ty_str_ctxt() -> @tyencode::ctxt {
|
|
@tyencode::ctxt {diag: self.tcx.sess.diagnostic(),
|
|
ds: e::def_to_str,
|
|
tcx: self.tcx,
|
|
reachable: |a| encoder::reachable(self, a),
|
|
abbrevs: tyencode::ac_use_abbrevs(self.type_abbrevs)}
|
|
}
|
|
}
|
|
|
|
trait ebml_writer_helpers {
|
|
fn emit_arg(ecx: @e::encode_ctxt, arg: ty::arg);
|
|
fn emit_ty(ecx: @e::encode_ctxt, ty: ty::t);
|
|
fn emit_vstore(ecx: @e::encode_ctxt, vstore: ty::vstore);
|
|
fn emit_tys(ecx: @e::encode_ctxt, tys: ~[ty::t]);
|
|
fn emit_bounds(ecx: @e::encode_ctxt, bs: ty::param_bounds);
|
|
fn emit_tpbt(ecx: @e::encode_ctxt, tpbt: ty::ty_param_bounds_and_ty);
|
|
}
|
|
|
|
impl writer::Encoder: ebml_writer_helpers {
|
|
fn emit_ty(ecx: @e::encode_ctxt, ty: ty::t) {
|
|
do self.emit_opaque {
|
|
e::write_type(ecx, self, ty)
|
|
}
|
|
}
|
|
|
|
fn emit_vstore(ecx: @e::encode_ctxt, vstore: ty::vstore) {
|
|
do self.emit_opaque {
|
|
e::write_vstore(ecx, self, vstore)
|
|
}
|
|
}
|
|
|
|
fn emit_arg(ecx: @e::encode_ctxt, arg: ty::arg) {
|
|
do self.emit_opaque {
|
|
tyencode::enc_arg(self.writer, ecx.ty_str_ctxt(), arg);
|
|
}
|
|
}
|
|
|
|
fn emit_tys(ecx: @e::encode_ctxt, tys: ~[ty::t]) {
|
|
do self.emit_from_vec(tys) |ty| {
|
|
self.emit_ty(ecx, *ty)
|
|
}
|
|
}
|
|
|
|
fn emit_bounds(ecx: @e::encode_ctxt, bs: ty::param_bounds) {
|
|
do self.emit_opaque {
|
|
tyencode::enc_bounds(self.writer, ecx.ty_str_ctxt(), bs)
|
|
}
|
|
}
|
|
|
|
fn emit_tpbt(ecx: @e::encode_ctxt, tpbt: ty::ty_param_bounds_and_ty) {
|
|
do self.emit_rec {
|
|
do self.emit_field(~"bounds", 0) {
|
|
do self.emit_from_vec(*tpbt.bounds) |bs| {
|
|
self.emit_bounds(ecx, *bs);
|
|
}
|
|
}
|
|
do self.emit_field(~"region_param", 1u) {
|
|
tpbt.region_param.encode(&self);
|
|
}
|
|
do self.emit_field(~"ty", 2u) {
|
|
self.emit_ty(ecx, tpbt.ty);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
trait write_tag_and_id {
|
|
fn tag(tag_id: c::astencode_tag, f: fn());
|
|
fn id(id: ast::node_id);
|
|
}
|
|
|
|
impl writer::Encoder: write_tag_and_id {
|
|
fn tag(tag_id: c::astencode_tag, f: fn()) {
|
|
do self.wr_tag(tag_id as uint) { f() }
|
|
}
|
|
|
|
fn id(id: ast::node_id) {
|
|
self.wr_tagged_u64(c::tag_table_id as uint, id as u64)
|
|
}
|
|
}
|
|
|
|
fn encode_side_tables_for_ii(ecx: @e::encode_ctxt,
|
|
maps: maps,
|
|
ebml_w: writer::Encoder,
|
|
ii: ast::inlined_item) {
|
|
do ebml_w.wr_tag(c::tag_table as uint) {
|
|
ast_util::visit_ids_for_inlined_item(
|
|
ii,
|
|
fn@(id: ast::node_id, copy ebml_w) {
|
|
// Note: this will cause a copy of ebml_w, which is bad as
|
|
// it has mut fields. But I believe it's harmless since
|
|
// we generate balanced EBML.
|
|
encode_side_tables_for_id(ecx, maps, ebml_w, id)
|
|
});
|
|
}
|
|
}
|
|
|
|
fn encode_side_tables_for_id(ecx: @e::encode_ctxt,
|
|
maps: maps,
|
|
ebml_w: writer::Encoder,
|
|
id: ast::node_id) {
|
|
let tcx = ecx.tcx;
|
|
|
|
debug!("Encoding side tables for id %d", id);
|
|
|
|
do option::iter(&tcx.def_map.find(id)) |def| {
|
|
do ebml_w.tag(c::tag_table_def) {
|
|
ebml_w.id(id);
|
|
do ebml_w.tag(c::tag_table_val) {
|
|
(*def).encode(&ebml_w)
|
|
}
|
|
}
|
|
}
|
|
do option::iter(&(*tcx.node_types).find(id as uint)) |ty| {
|
|
do ebml_w.tag(c::tag_table_node_type) {
|
|
ebml_w.id(id);
|
|
do ebml_w.tag(c::tag_table_val) {
|
|
ebml_w.emit_ty(ecx, *ty);
|
|
}
|
|
}
|
|
}
|
|
|
|
do option::iter(&tcx.node_type_substs.find(id)) |tys| {
|
|
do ebml_w.tag(c::tag_table_node_type_subst) {
|
|
ebml_w.id(id);
|
|
do ebml_w.tag(c::tag_table_val) {
|
|
ebml_w.emit_tys(ecx, /*bad*/copy *tys)
|
|
}
|
|
}
|
|
}
|
|
|
|
do option::iter(&tcx.freevars.find(id)) |fv| {
|
|
do ebml_w.tag(c::tag_table_freevars) {
|
|
ebml_w.id(id);
|
|
do ebml_w.tag(c::tag_table_val) {
|
|
do ebml_w.emit_from_vec(**fv) |fv_entry| {
|
|
encode_freevar_entry(ebml_w, *fv_entry)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
let lid = ast::def_id { crate: ast::local_crate, node: id };
|
|
do option::iter(&tcx.tcache.find(lid)) |tpbt| {
|
|
do ebml_w.tag(c::tag_table_tcache) {
|
|
ebml_w.id(id);
|
|
do ebml_w.tag(c::tag_table_val) {
|
|
ebml_w.emit_tpbt(ecx, *tpbt);
|
|
}
|
|
}
|
|
}
|
|
|
|
do option::iter(&tcx.ty_param_bounds.find(id)) |pbs| {
|
|
do ebml_w.tag(c::tag_table_param_bounds) {
|
|
ebml_w.id(id);
|
|
do ebml_w.tag(c::tag_table_val) {
|
|
ebml_w.emit_bounds(ecx, *pbs)
|
|
}
|
|
}
|
|
}
|
|
|
|
// I believe it is not necessary to encode this information. The
|
|
// ids will appear in the AST but in the *type* information, which
|
|
// is what we actually use in trans, all modes will have been
|
|
// resolved.
|
|
//
|
|
//option::iter(tcx.inferred_modes.find(id)) {|m|
|
|
// ebml_w.tag(c::tag_table_inferred_modes) {||
|
|
// ebml_w.id(id);
|
|
// ebml_w.tag(c::tag_table_val) {||
|
|
// tyencode::enc_mode(ebml_w.writer, ty_str_ctxt(), m);
|
|
// }
|
|
// }
|
|
//}
|
|
|
|
do option::iter(&maps.mutbl_map.find(id)) |_m| {
|
|
do ebml_w.tag(c::tag_table_mutbl) {
|
|
ebml_w.id(id);
|
|
}
|
|
}
|
|
|
|
do option::iter(&maps.last_use_map.find(id)) |m| {
|
|
do ebml_w.tag(c::tag_table_last_use) {
|
|
ebml_w.id(id);
|
|
do ebml_w.tag(c::tag_table_val) {
|
|
do ebml_w.emit_from_vec((*m).get()) |id| {
|
|
id.encode(&ebml_w);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
do option::iter(&maps.method_map.find(id)) |mme| {
|
|
do ebml_w.tag(c::tag_table_method_map) {
|
|
ebml_w.id(id);
|
|
do ebml_w.tag(c::tag_table_val) {
|
|
encode_method_map_entry(ecx, ebml_w, *mme)
|
|
}
|
|
}
|
|
}
|
|
|
|
do option::iter(&maps.vtable_map.find(id)) |dr| {
|
|
do ebml_w.tag(c::tag_table_vtable_map) {
|
|
ebml_w.id(id);
|
|
do ebml_w.tag(c::tag_table_val) {
|
|
encode_vtable_res(ecx, ebml_w, *dr);
|
|
}
|
|
}
|
|
}
|
|
|
|
do option::iter(&tcx.adjustments.find(id)) |adj| {
|
|
do ebml_w.tag(c::tag_table_adjustments) {
|
|
ebml_w.id(id);
|
|
do ebml_w.tag(c::tag_table_val) {
|
|
(**adj).encode(&ebml_w)
|
|
}
|
|
}
|
|
}
|
|
|
|
do option::iter(&tcx.legacy_boxed_traits.find(id)) |_x| {
|
|
do ebml_w.tag(c::tag_table_legacy_boxed_trait) {
|
|
ebml_w.id(id);
|
|
}
|
|
}
|
|
|
|
do option::iter(&tcx.value_modes.find(id)) |vm| {
|
|
do ebml_w.tag(c::tag_table_value_mode) {
|
|
ebml_w.id(id);
|
|
do ebml_w.tag(c::tag_table_val) {
|
|
(*vm).encode(&ebml_w)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
trait doc_decoder_helpers {
|
|
fn as_int() -> int;
|
|
fn opt_child(tag: c::astencode_tag) -> Option<ebml::Doc>;
|
|
}
|
|
|
|
impl ebml::Doc: doc_decoder_helpers {
|
|
fn as_int() -> int { reader::doc_as_u64(self) as int }
|
|
fn opt_child(tag: c::astencode_tag) -> Option<ebml::Doc> {
|
|
reader::maybe_get_doc(self, tag as uint)
|
|
}
|
|
}
|
|
|
|
trait ebml_decoder_decoder_helpers {
|
|
fn read_arg(xcx: extended_decode_ctxt) -> ty::arg;
|
|
fn read_ty(xcx: extended_decode_ctxt) -> ty::t;
|
|
fn read_tys(xcx: extended_decode_ctxt) -> ~[ty::t];
|
|
fn read_bounds(xcx: extended_decode_ctxt) -> @~[ty::param_bound];
|
|
fn read_ty_param_bounds_and_ty(xcx: extended_decode_ctxt)
|
|
-> ty::ty_param_bounds_and_ty;
|
|
fn convert_def_id(xcx: extended_decode_ctxt,
|
|
source: DefIdSource,
|
|
did: ast::def_id) -> ast::def_id;
|
|
}
|
|
|
|
impl reader::Decoder: ebml_decoder_decoder_helpers {
|
|
fn read_arg(xcx: extended_decode_ctxt) -> ty::arg {
|
|
do self.read_opaque |doc| {
|
|
tydecode::parse_arg_data(
|
|
doc.data, xcx.dcx.cdata.cnum, doc.start, xcx.dcx.tcx,
|
|
|s, a| self.convert_def_id(xcx, s, a))
|
|
}
|
|
}
|
|
|
|
fn read_ty(xcx: extended_decode_ctxt) -> ty::t {
|
|
// Note: regions types embed local node ids. In principle, we
|
|
// should translate these node ids into the new decode
|
|
// context. However, we do not bother, because region types
|
|
// are not used during trans.
|
|
|
|
do self.read_opaque |doc| {
|
|
tydecode::parse_ty_data(
|
|
doc.data, xcx.dcx.cdata.cnum, doc.start, xcx.dcx.tcx,
|
|
|s, a| self.convert_def_id(xcx, s, a))
|
|
}
|
|
}
|
|
|
|
fn read_tys(xcx: extended_decode_ctxt) -> ~[ty::t] {
|
|
self.read_to_vec(|| self.read_ty(xcx) )
|
|
}
|
|
|
|
fn read_bounds(xcx: extended_decode_ctxt) -> @~[ty::param_bound] {
|
|
do self.read_opaque |doc| {
|
|
tydecode::parse_bounds_data(
|
|
doc.data, doc.start, xcx.dcx.cdata.cnum, xcx.dcx.tcx,
|
|
|s, a| self.convert_def_id(xcx, s, a))
|
|
}
|
|
}
|
|
|
|
fn read_ty_param_bounds_and_ty(xcx: extended_decode_ctxt)
|
|
-> ty::ty_param_bounds_and_ty
|
|
{
|
|
do self.read_rec {
|
|
{
|
|
bounds: self.read_field(~"bounds", 0u, || {
|
|
@self.read_to_vec(|| self.read_bounds(xcx) )
|
|
}),
|
|
region_param: self.read_field(~"region_param", 1u, || {
|
|
Decodable::decode(&self)
|
|
}),
|
|
ty: self.read_field(~"ty", 2u, || {
|
|
self.read_ty(xcx)
|
|
})
|
|
}
|
|
}
|
|
}
|
|
|
|
fn convert_def_id(xcx: extended_decode_ctxt,
|
|
source: tydecode::DefIdSource,
|
|
did: ast::def_id) -> ast::def_id {
|
|
/*!
|
|
*
|
|
* Converts a def-id that appears in a type. The correct
|
|
* translation will depend on what kind of def-id this is.
|
|
* This is a subtle point: type definitions are not
|
|
* inlined into the current crate, so if the def-id names
|
|
* a nominal type or type alias, then it should be
|
|
* translated to refer to the source crate.
|
|
*
|
|
* However, *type parameters* are cloned along with the function
|
|
* they are attached to. So we should translate those def-ids
|
|
* to refer to the new, cloned copy of the type parameter.
|
|
*/
|
|
|
|
match source {
|
|
NominalType | TypeWithId => xcx.tr_def_id(did),
|
|
TypeParameter => xcx.tr_intern_def_id(did)
|
|
}
|
|
}
|
|
}
|
|
|
|
fn decode_side_tables(xcx: extended_decode_ctxt,
|
|
ast_doc: ebml::Doc) {
|
|
let dcx = xcx.dcx;
|
|
let tbl_doc = ast_doc[c::tag_table as uint];
|
|
for reader::docs(tbl_doc) |tag, entry_doc| {
|
|
let id0 = entry_doc[c::tag_table_id as uint].as_int();
|
|
let id = xcx.tr_id(id0);
|
|
|
|
debug!(">> Side table document with tag 0x%x \
|
|
found for id %d (orig %d)",
|
|
tag, id, id0);
|
|
|
|
if tag == (c::tag_table_mutbl as uint) {
|
|
dcx.maps.mutbl_map.insert(id, ());
|
|
} else if tag == (c::tag_table_legacy_boxed_trait as uint) {
|
|
dcx.tcx.legacy_boxed_traits.insert(id, ());
|
|
} else {
|
|
let val_doc = entry_doc[c::tag_table_val as uint];
|
|
let val_dsr = &reader::Decoder(val_doc);
|
|
if tag == (c::tag_table_def as uint) {
|
|
let def = decode_def(xcx, val_doc);
|
|
dcx.tcx.def_map.insert(id, def);
|
|
} else if tag == (c::tag_table_node_type as uint) {
|
|
let ty = val_dsr.read_ty(xcx);
|
|
(*dcx.tcx.node_types).insert(id as uint, ty);
|
|
} else if tag == (c::tag_table_node_type_subst as uint) {
|
|
let tys = val_dsr.read_tys(xcx);
|
|
dcx.tcx.node_type_substs.insert(id, tys);
|
|
} else if tag == (c::tag_table_freevars as uint) {
|
|
let fv_info = @val_dsr.read_to_vec(|| {
|
|
@val_dsr.read_freevar_entry(xcx)
|
|
});
|
|
dcx.tcx.freevars.insert(id, fv_info);
|
|
} else if tag == (c::tag_table_tcache as uint) {
|
|
let tpbt = val_dsr.read_ty_param_bounds_and_ty(xcx);
|
|
let lid = ast::def_id { crate: ast::local_crate, node: id };
|
|
dcx.tcx.tcache.insert(lid, tpbt);
|
|
} else if tag == (c::tag_table_param_bounds as uint) {
|
|
let bounds = val_dsr.read_bounds(xcx);
|
|
dcx.tcx.ty_param_bounds.insert(id, bounds);
|
|
} else if tag == (c::tag_table_last_use as uint) {
|
|
let ids = val_dsr.read_to_vec(|| {
|
|
xcx.tr_id(val_dsr.read_int())
|
|
});
|
|
let dvec = @dvec::from_vec(move ids);
|
|
dcx.maps.last_use_map.insert(id, dvec);
|
|
} else if tag == (c::tag_table_method_map as uint) {
|
|
dcx.maps.method_map.insert(
|
|
id,
|
|
val_dsr.read_method_map_entry(xcx));
|
|
} else if tag == (c::tag_table_vtable_map as uint) {
|
|
dcx.maps.vtable_map.insert(id,
|
|
val_dsr.read_vtable_res(xcx));
|
|
} else if tag == (c::tag_table_adjustments as uint) {
|
|
let adj: @ty::AutoAdjustment = @Decodable::decode(val_dsr);
|
|
adj.tr(xcx);
|
|
dcx.tcx.adjustments.insert(id, adj);
|
|
} else if tag == (c::tag_table_value_mode as uint) {
|
|
let vm: ty::ValueMode = Decodable::decode(val_dsr);
|
|
dcx.tcx.value_modes.insert(id, vm);
|
|
} else {
|
|
xcx.dcx.tcx.sess.bug(
|
|
fmt!("unknown tag found in side tables: %x", tag));
|
|
}
|
|
}
|
|
|
|
debug!(">< Side table doc loaded");
|
|
}
|
|
}
|
|
|
|
// ______________________________________________________________________
|
|
// Testing of astencode_gen
|
|
|
|
#[cfg(test)]
|
|
fn encode_item_ast(ebml_w: writer::Encoder, item: @ast::item) {
|
|
do ebml_w.wr_tag(c::tag_tree as uint) {
|
|
(*item).encode(&ebml_w)
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
fn decode_item_ast(par_doc: ebml::Doc) -> @ast::item {
|
|
let chi_doc = par_doc[c::tag_tree as uint];
|
|
let d = &reader::Decoder(chi_doc);
|
|
@Decodable::decode(d)
|
|
}
|
|
|
|
#[cfg(test)]
|
|
trait fake_ext_ctxt {
|
|
fn cfg() -> ast::crate_cfg;
|
|
fn parse_sess() -> parse::parse_sess;
|
|
fn call_site() -> span;
|
|
fn ident_of(+st: ~str) -> ast::ident;
|
|
}
|
|
|
|
#[cfg(test)]
|
|
type fake_session = parse::parse_sess;
|
|
|
|
#[cfg(test)]
|
|
impl fake_session: fake_ext_ctxt {
|
|
fn cfg() -> ast::crate_cfg { ~[] }
|
|
fn parse_sess() -> parse::parse_sess { self }
|
|
fn call_site() -> span {
|
|
codemap::span {
|
|
lo: codemap::BytePos(0),
|
|
hi: codemap::BytePos(0),
|
|
expn_info: None
|
|
}
|
|
}
|
|
fn ident_of(+st: ~str) -> ast::ident {
|
|
self.interner.intern(@st)
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
fn mk_ctxt() -> fake_ext_ctxt {
|
|
parse::new_parse_sess(None) as fake_ext_ctxt
|
|
}
|
|
|
|
#[cfg(test)]
|
|
fn roundtrip(in_item: Option<@ast::item>) {
|
|
let in_item = in_item.get();
|
|
let bytes = do io::with_bytes_writer |wr| {
|
|
let ebml_w = writer::Encoder(wr);
|
|
encode_item_ast(ebml_w, in_item);
|
|
};
|
|
let ebml_doc = reader::Doc(@bytes);
|
|
let out_item = decode_item_ast(ebml_doc);
|
|
|
|
let exp_str = do io::with_str_writer |w| {
|
|
in_item.encode(&prettyprint::Serializer(w))
|
|
};
|
|
let out_str = do io::with_str_writer |w| {
|
|
out_item.encode(&prettyprint::Serializer(w))
|
|
};
|
|
|
|
debug!("expected string: %s", exp_str);
|
|
debug!("actual string : %s", out_str);
|
|
|
|
assert exp_str == out_str;
|
|
}
|
|
|
|
#[test]
|
|
fn test_basic() {
|
|
let ext_cx = mk_ctxt();
|
|
roundtrip(quote_item!(
|
|
fn foo() {}
|
|
));
|
|
}
|
|
|
|
#[test]
|
|
fn test_smalltalk() {
|
|
let ext_cx = mk_ctxt();
|
|
roundtrip(quote_item!(
|
|
fn foo() -> int { 3 + 4 } // first smalltalk program ever executed.
|
|
));
|
|
}
|
|
|
|
#[test]
|
|
fn test_more() {
|
|
let ext_cx = mk_ctxt();
|
|
roundtrip(quote_item!(
|
|
fn foo(x: uint, y: uint) -> uint {
|
|
let z = x + y;
|
|
return z;
|
|
}
|
|
));
|
|
}
|
|
|
|
#[test]
|
|
fn test_simplification() {
|
|
let ext_cx = mk_ctxt();
|
|
let item_in = ast::ii_item(quote_item!(
|
|
fn new_int_alist<B: Copy>() -> alist<int, B> {
|
|
fn eq_int(&&a: int, &&b: int) -> bool { a == b }
|
|
return {eq_fn: eq_int, mut data: ~[]};
|
|
}
|
|
).get());
|
|
let item_out = simplify_ast(item_in);
|
|
let item_exp = ast::ii_item(quote_item!(
|
|
fn new_int_alist<B: Copy>() -> alist<int, B> {
|
|
return {eq_fn: eq_int, mut data: ~[]};
|
|
}
|
|
).get());
|
|
match (item_out, item_exp) {
|
|
(ast::ii_item(item_out), ast::ii_item(item_exp)) => {
|
|
assert pprust::item_to_str(item_out, ext_cx.parse_sess().interner)
|
|
== pprust::item_to_str(item_exp, ext_cx.parse_sess().interner);
|
|
}
|
|
_ => fail
|
|
}
|
|
}
|