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// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// This module provides implementations for the thread-local encoding and
// decoding context traits in rustc::middle::cstore::tls.
use rbml::opaque::Encoder as OpaqueEncoder;
use rbml::opaque::Decoder as OpaqueDecoder;
use rustc::middle::cstore::tls;
use rustc::hir::def_id::DefId;
use rustc::ty::subst::Substs;
use rustc::ty::{self, TyCtxt};
use decoder::{self, Cmd};
use encoder;
use tydecode::TyDecoder;
use tyencode;
impl<'a, 'tcx: 'a> tls::EncodingContext<'tcx> for encoder::EncodeContext<'a, 'tcx> {
fn tcx<'s>(&'s self) -> TyCtxt<'s, 'tcx, 'tcx> {
self.tcx
}
fn encode_ty(&self, encoder: &mut OpaqueEncoder, t: ty::Ty<'tcx>) {
tyencode::enc_ty(encoder.cursor, &self.ty_str_ctxt(), t);
}
fn encode_substs(&self, encoder: &mut OpaqueEncoder, substs: &Substs<'tcx>) {
tyencode::enc_substs(encoder.cursor, &self.ty_str_ctxt(), substs);
}
}
pub struct DecodingContext<'a, 'tcx: 'a> {
pub crate_metadata: Cmd<'a>,
pub tcx: TyCtxt<'a, 'tcx, 'tcx>,
}
impl<'a, 'tcx: 'a> tls::DecodingContext<'tcx> for DecodingContext<'a, 'tcx> {
fn tcx<'s>(&'s self) -> TyCtxt<'s, 'tcx, 'tcx> {
self.tcx
}
fn decode_ty(&self, decoder: &mut OpaqueDecoder) -> ty::Ty<'tcx> {
let def_id_convert = &mut |did| {
decoder::translate_def_id(self.crate_metadata, did)
};
let starting_position = decoder.position();
let mut ty_decoder = TyDecoder::new(
self.crate_metadata.data.as_slice(),
self.crate_metadata.cnum,
starting_position,
self.tcx,
def_id_convert);
let ty = ty_decoder.parse_ty();
let end_position = ty_decoder.position();
// We can just reuse the tydecode implementation for parsing types, but
// we have to make sure to leave the rbml reader at the position just
// after the type.
decoder.advance(end_position - starting_position);
ty
}
fn decode_substs(&self, decoder: &mut OpaqueDecoder) -> Substs<'tcx> {
let def_id_convert = &mut |did| {
decoder::translate_def_id(self.crate_metadata, did)
};
let starting_position = decoder.position();
let mut ty_decoder = TyDecoder::new(
self.crate_metadata.data.as_slice(),
self.crate_metadata.cnum,
starting_position,
self.tcx,
def_id_convert);
let substs = ty_decoder.parse_substs();
let end_position = ty_decoder.position();
decoder.advance(end_position - starting_position);
substs
}
fn translate_def_id(&self, def_id: DefId) -> DefId {
decoder::translate_def_id(self.crate_metadata, def_id)
}
}
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