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use crate::ich;
use rustc_ast as ast;
use rustc_data_structures::sorted_map::SortedMap;
use rustc_data_structures::stable_hasher::{HashStable, HashingControls, StableHasher};
use rustc_data_structures::sync::Lrc;
use rustc_hir as hir;
use rustc_hir::def_id::{DefId, LocalDefId};
use rustc_hir::definitions::{DefPathHash, Definitions};
use rustc_index::vec::IndexVec;
use rustc_session::cstore::CrateStore;
use rustc_session::Session;
use rustc_span::source_map::SourceMap;
use rustc_span::symbol::Symbol;
use rustc_span::{BytePos, CachingSourceMapView, SourceFile, Span, SpanData};
/// This is the context state available during incr. comp. hashing. It contains
/// enough information to transform `DefId`s and `HirId`s into stable `DefPath`s (i.e.,
/// a reference to the `TyCtxt`) and it holds a few caches for speeding up various
/// things (e.g., each `DefId`/`DefPath` is only hashed once).
#[derive(Clone)]
pub struct StableHashingContext<'a> {
definitions: &'a Definitions,
cstore: &'a dyn CrateStore,
source_span: &'a IndexVec<LocalDefId, Span>,
// The value of `-Z incremental-ignore-spans`.
// This field should only be used by `unstable_opts_incremental_ignore_span`
incremental_ignore_spans: bool,
pub(super) body_resolver: BodyResolver<'a>,
// Very often, we are hashing something that does not need the
// `CachingSourceMapView`, so we initialize it lazily.
raw_source_map: &'a SourceMap,
caching_source_map: Option<CachingSourceMapView<'a>>,
pub(super) hashing_controls: HashingControls,
}
/// The `BodyResolver` allows mapping a `BodyId` to the corresponding `hir::Body`.
/// We could also just store a plain reference to the `hir::Crate` but we want
/// to avoid that the crate is used to get untracked access to all of the HIR.
#[derive(Clone, Copy)]
pub(super) enum BodyResolver<'tcx> {
Forbidden,
Ignore,
Traverse { owner: LocalDefId, bodies: &'tcx SortedMap<hir::ItemLocalId, &'tcx hir::Body<'tcx>> },
}
impl<'a> StableHashingContext<'a> {
#[inline]
fn new_with_or_without_spans(
sess: &'a Session,
definitions: &'a Definitions,
cstore: &'a dyn CrateStore,
source_span: &'a IndexVec<LocalDefId, Span>,
always_ignore_spans: bool,
) -> Self {
let hash_spans_initial =
!always_ignore_spans && !sess.opts.unstable_opts.incremental_ignore_spans;
StableHashingContext {
body_resolver: BodyResolver::Forbidden,
definitions,
cstore,
source_span,
incremental_ignore_spans: sess.opts.unstable_opts.incremental_ignore_spans,
caching_source_map: None,
raw_source_map: sess.source_map(),
hashing_controls: HashingControls { hash_spans: hash_spans_initial },
}
}
#[inline]
pub fn new(
sess: &'a Session,
definitions: &'a Definitions,
cstore: &'a dyn CrateStore,
source_span: &'a IndexVec<LocalDefId, Span>,
) -> Self {
Self::new_with_or_without_spans(
sess,
definitions,
cstore,
source_span,
/*always_ignore_spans=*/ false,
)
}
#[inline]
pub fn ignore_spans(
sess: &'a Session,
definitions: &'a Definitions,
cstore: &'a dyn CrateStore,
source_span: &'a IndexVec<LocalDefId, Span>,
) -> Self {
let always_ignore_spans = true;
Self::new_with_or_without_spans(sess, definitions, cstore, source_span, always_ignore_spans)
}
#[inline]
pub fn without_hir_bodies(&mut self, f: impl FnOnce(&mut StableHashingContext<'_>)) {
f(&mut StableHashingContext { body_resolver: BodyResolver::Ignore, ..self.clone() });
}
#[inline]
pub fn with_hir_bodies(
&mut self,
owner: LocalDefId,
bodies: &SortedMap<hir::ItemLocalId, &hir::Body<'_>>,
f: impl FnOnce(&mut StableHashingContext<'_>),
) {
f(&mut StableHashingContext {
body_resolver: BodyResolver::Traverse { owner, bodies },
..self.clone()
});
}
#[inline]
pub fn while_hashing_spans<F: FnOnce(&mut Self)>(&mut self, hash_spans: bool, f: F) {
let prev_hash_spans = self.hashing_controls.hash_spans;
self.hashing_controls.hash_spans = hash_spans;
f(self);
self.hashing_controls.hash_spans = prev_hash_spans;
}
#[inline]
pub fn def_path_hash(&self, def_id: DefId) -> DefPathHash {
if let Some(def_id) = def_id.as_local() {
self.local_def_path_hash(def_id)
} else {
self.cstore.def_path_hash(def_id)
}
}
#[inline]
pub fn local_def_path_hash(&self, def_id: LocalDefId) -> DefPathHash {
self.definitions.def_path_hash(def_id)
}
#[inline]
pub fn source_map(&mut self) -> &mut CachingSourceMapView<'a> {
match self.caching_source_map {
Some(ref mut sm) => sm,
ref mut none => {
*none = Some(CachingSourceMapView::new(self.raw_source_map));
none.as_mut().unwrap()
}
}
}
#[inline]
pub fn is_ignored_attr(&self, name: Symbol) -> bool {
ich::IGNORED_ATTRIBUTES.contains(&name)
}
#[inline]
pub fn hashing_controls(&self) -> HashingControls {
self.hashing_controls.clone()
}
}
impl<'a> HashStable<StableHashingContext<'a>> for ast::NodeId {
#[inline]
fn hash_stable(&self, _: &mut StableHashingContext<'a>, _: &mut StableHasher) {
panic!("Node IDs should not appear in incremental state");
}
}
impl<'a> rustc_span::HashStableContext for StableHashingContext<'a> {
#[inline]
fn hash_spans(&self) -> bool {
self.hashing_controls.hash_spans
}
#[inline]
fn unstable_opts_incremental_ignore_spans(&self) -> bool {
self.incremental_ignore_spans
}
#[inline]
fn def_path_hash(&self, def_id: DefId) -> DefPathHash {
self.def_path_hash(def_id)
}
#[inline]
fn def_span(&self, def_id: LocalDefId) -> Span {
self.source_span[def_id]
}
#[inline]
fn span_data_to_lines_and_cols(
&mut self,
span: &SpanData,
) -> Option<(Lrc<SourceFile>, usize, BytePos, usize, BytePos)> {
self.source_map().span_data_to_lines_and_cols(span)
}
#[inline]
fn hashing_controls(&self) -> HashingControls {
self.hashing_controls.clone()
}
}
impl<'a> rustc_data_structures::intern::InternedHashingContext for StableHashingContext<'a> {
fn with_def_path_and_no_spans(&mut self, f: impl FnOnce(&mut Self)) {
self.while_hashing_spans(false, f);
}
}
impl<'a> rustc_session::HashStableContext for StableHashingContext<'a> {}
|
