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Add documentation.

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This commit is contained in:
Camille GILLOT 2021-03-17 19:23:17 +01:00
parent c5c935af92
commit 65a8681a17
1 changed files with 12 additions and 0 deletions
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compiler/rustc_query_system/src/dep_graph/serialized.rs
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@ -1,4 +1,16 @@
//! The data that we will serialize and deserialize.
//!
//! The dep-graph is serialized as a sequence of NodeInfo, with the dependencies
//! specified inline. The total number of nodes and edges are stored as the last
//! 16 bytes of the file, so we can find them easily at decoding time.
//!
//! The serialisation is performed on-demand when each node is emitted. Using this
//! scheme, we do not need to keep the current graph in memory.
//!
//! The deserisalisation is performed manually, in order to convert from the stored
//! sequence of NodeInfos to the different arrays in SerializedDepGraph. Since the
//! node and edge count are stored at the end of the file, all the arrays can be
//! pre-allocated with the right length.
use super::query::DepGraphQuery;
use super::{DepKind, DepNode, DepNodeIndex};