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// Copyright 2014 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.
//! The data that we will serialize and deserialize.
use rustc::dep_graph::{WorkProduct, WorkProductId};
use rustc::hir::def_id::DefIndex;
use rustc::hir::map::DefPathHash;
use rustc::middle::cstore::EncodedMetadataHash;
use rustc_data_structures::fx::FxHashMap;
#[derive(Debug, RustcEncodable, RustcDecodable)]
pub struct SerializedWorkProduct {
/// node that produced the work-product
pub id: WorkProductId,
/// work-product data itself
pub work_product: WorkProduct,
}
/// Data for use when downstream crates get recompiled.
#[derive(Debug, RustcEncodable, RustcDecodable)]
pub struct SerializedMetadataHashes {
/// For each def-id defined in this crate that appears in the
/// metadata, we hash all the inputs that were used when producing
/// the metadata. We save this after compilation is done. Then,
/// when some downstream crate is being recompiled, it can compare
/// the hashes we saved against the hashes that it saw from
/// before; this will tell it which of the items in this crate
/// changed, which in turn implies what items in the downstream
/// crate need to be recompiled.
///
/// Note that we store the def-ids here. This is because we don't
/// reload this file when we recompile this crate, we will just
/// regenerate it completely with the current hashes and new def-ids.
///
/// Then downstream creates will load up their
/// `SerializedDepGraph`, which may contain `MetaData(X)` nodes
/// where `X` refers to some item in this crate. That `X` will be
/// a `DefPathIndex` that gets retracted to the current `DefId`
/// (matching the one found in this structure).
pub entry_hashes: Vec<EncodedMetadataHash>,
/// For each DefIndex (as it occurs in SerializedMetadataHash), this
/// map stores the DefPathIndex (as it occurs in DefIdDirectory), so
/// that we can find the new DefId for a SerializedMetadataHash in a
/// subsequent compilation session.
///
/// This map is only needed for running auto-tests using the
/// #[rustc_metadata_dirty] and #[rustc_metadata_clean] attributes, and
/// is only populated if -Z query-dep-graph is specified. It will be
/// empty otherwise. Importing crates are perfectly happy with just having
/// the DefIndex.
pub index_map: FxHashMap<DefIndex, DefPathHash>
}
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