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1acbe7573d
There are two impls of the `Encoder` trait: `opaque::Encoder` and `opaque::FileEncoder`. The former encodes into memory and is infallible, the latter writes to file and is fallible. Currently, standard `Result`/`?`/`unwrap` error handling is used, but this is a bit verbose and has non-trivial cost, which is annoying given how rare failures are (especially in the infallible `opaque::Encoder` case). This commit changes how `Encoder` fallibility is handled. All the `emit_*` methods are now infallible. `opaque::Encoder` requires no great changes for this. `opaque::FileEncoder` now implements a delayed error handling strategy. If a failure occurs, it records this via the `res` field, and all subsequent encoding operations are skipped if `res` indicates an error has occurred. Once encoding is complete, the new `finish` method is called, which returns a `Result`. In other words, there is now a single `Result`-producing method instead of many of them. This has very little effect on how any file errors are reported if `opaque::FileEncoder` has any failures. Much of this commit is boring mechanical changes, removing `Result` return values and `?` or `unwrap` from expressions. The more interesting parts are as follows. - serialize.rs: The `Encoder` trait gains an `Ok` associated type. The `into_inner` method is changed into `finish`, which returns `Result<Vec<u8>, !>`. - opaque.rs: The `FileEncoder` adopts the delayed error handling strategy. Its `Ok` type is a `usize`, returning the number of bytes written, replacing previous uses of `FileEncoder::position`. - Various methods that take an encoder now consume it, rather than being passed a mutable reference, e.g. `serialize_query_result_cache`.
62 lines
1.7 KiB
Rust
62 lines
1.7 KiB
Rust
//! Support for serializing the dep-graph and reloading it.
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#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
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#![feature(min_specialization)]
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#![feature(never_type)]
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#![feature(once_cell)]
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#![feature(rustc_attrs)]
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#![recursion_limit = "256"]
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#![allow(rustc::potential_query_instability)]
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#[macro_use]
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extern crate rustc_macros;
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#[macro_use]
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extern crate rustc_middle;
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use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
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use rustc_data_structures::sync::AtomicU64;
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use rustc_middle::arena::Arena;
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use rustc_middle::dep_graph::{self, DepKindStruct, SerializedDepNodeIndex};
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use rustc_middle::ty::query::{query_keys, query_storage, query_stored, query_values};
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use rustc_middle::ty::query::{ExternProviders, Providers, QueryEngine};
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use rustc_middle::ty::{self, TyCtxt};
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use rustc_span::def_id::{LocalDefId, LOCAL_CRATE};
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use rustc_span::Span;
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#[macro_use]
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mod plumbing;
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pub use plumbing::QueryCtxt;
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use rustc_query_system::query::*;
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mod keys;
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use keys::Key;
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mod values;
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use self::values::Value;
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pub use rustc_query_system::query::QueryConfig;
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pub(crate) use rustc_query_system::query::{QueryDescription, QueryVtable};
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mod on_disk_cache;
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pub use on_disk_cache::OnDiskCache;
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mod profiling_support;
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pub use self::profiling_support::alloc_self_profile_query_strings;
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fn describe_as_module(def_id: LocalDefId, tcx: TyCtxt<'_>) -> String {
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if def_id.is_top_level_module() {
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"top-level module".to_string()
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} else {
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format!("module `{}`", tcx.def_path_str(def_id.to_def_id()))
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}
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}
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rustc_query_append! { [define_queries!][<'tcx>] }
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impl<'tcx> Queries<'tcx> {
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// Force codegen in the dyn-trait transformation in this crate.
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pub fn as_dyn(&'tcx self) -> &'tcx dyn QueryEngine<'tcx> {
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self
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}
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}
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