Rollup merge of #71893 - ecstatic-morse:dataflow-impls-import, r=jonas-schievink

Use the `impls` module to import pre-existing dataflow analyses

Currently, existing analyses live in the same module as the traits and types used to define new dataflow analyses. This muddles the [documentation for the `dataflow` module](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir/dataflow/index.html). After this PR, `dataflow::impls` will refer to concrete dataflow analyses, and `dataflow` to the generic interface.

src/librustc_mir/borrow_check/mod.rs

@@ -32,13 +32,13 @@ use std::mem;
 use std::rc::Rc;
 
 use crate::dataflow;
+use crate::dataflow::impls::{
+    Borrows, EverInitializedPlaces, MaybeInitializedPlaces, MaybeUninitializedPlaces,
+};
 use crate::dataflow::indexes::{BorrowIndex, InitIndex, MoveOutIndex, MovePathIndex};
 use crate::dataflow::move_paths::{InitLocation, LookupResult, MoveData, MoveError};
-use crate::dataflow::Borrows;
-use crate::dataflow::EverInitializedPlaces;
 use crate::dataflow::MoveDataParamEnv;
 use crate::dataflow::{Analysis, BorrowckFlowState as Flows, BorrowckResults};
-use crate::dataflow::{MaybeInitializedPlaces, MaybeUninitializedPlaces};
 use crate::transform::MirSource;
 
 use self::diagnostics::{AccessKind, RegionName};

src/librustc_mir/borrow_check/nll.rs

@@ -21,8 +21,8 @@ use std::str::FromStr;
 use self::mir_util::PassWhere;
 use polonius_engine::{Algorithm, Output};
 
+use crate::dataflow::impls::MaybeInitializedPlaces;
 use crate::dataflow::move_paths::{InitKind, InitLocation, MoveData};
-use crate::dataflow::MaybeInitializedPlaces;
 use crate::dataflow::ResultsCursor;
 use crate::transform::MirSource;
 use crate::util as mir_util;

src/librustc_mir/borrow_check/type_check/liveness/mod.rs

@@ -3,8 +3,8 @@ use rustc_middle::mir::{Body, Local};
 use rustc_middle::ty::{RegionVid, TyCtxt};
 use std::rc::Rc;
 
+use crate::dataflow::impls::MaybeInitializedPlaces;
 use crate::dataflow::move_paths::MoveData;
-use crate::dataflow::MaybeInitializedPlaces;
 use crate::dataflow::ResultsCursor;
 
 use crate::borrow_check::{

src/librustc_mir/borrow_check/type_check/liveness/trace.rs

@@ -8,9 +8,9 @@ use rustc_trait_selection::traits::query::type_op::outlives::DropckOutlives;
 use rustc_trait_selection::traits::query::type_op::TypeOp;
 use std::rc::Rc;
 
+use crate::dataflow::impls::MaybeInitializedPlaces;
 use crate::dataflow::indexes::MovePathIndex;
 use crate::dataflow::move_paths::{HasMoveData, MoveData};
-use crate::dataflow::MaybeInitializedPlaces;
 use crate::dataflow::ResultsCursor;
 
 use crate::borrow_check::{

src/librustc_mir/borrow_check/type_check/mod.rs

@@ -39,8 +39,8 @@ use rustc_trait_selection::traits::query::type_op::custom::CustomTypeOp;
 use rustc_trait_selection::traits::query::{Fallible, NoSolution};
 use rustc_trait_selection::traits::{self, ObligationCause, PredicateObligations};
 
+use crate::dataflow::impls::MaybeInitializedPlaces;
 use crate::dataflow::move_paths::MoveData;
-use crate::dataflow::MaybeInitializedPlaces;
 use crate::dataflow::ResultsCursor;
 use crate::transform::{
     check_consts::ConstCx,

src/librustc_mir/dataflow/impls/mod.rs

@@ -21,14 +21,14 @@ use super::on_lookup_result_bits;
 use crate::dataflow::drop_flag_effects;
 
 mod borrowed_locals;
+pub(super) mod borrows;
 mod liveness;
 mod storage_liveness;
 
-pub use self::borrowed_locals::*;
+pub use self::borrowed_locals::{MaybeBorrowedLocals, MaybeMutBorrowedLocals};
+pub use self::borrows::Borrows;
 pub use self::liveness::MaybeLiveLocals;
-pub use self::storage_liveness::*;
-
-pub(super) mod borrows;
+pub use self::storage_liveness::{MaybeRequiresStorage, MaybeStorageLive};
 
 /// `MaybeInitializedPlaces` tracks all places that might be
 /// initialized upon reaching a particular point in the control flow

src/librustc_mir/dataflow/mod.rs

@@ -8,17 +8,12 @@ pub use self::framework::{
     BottomValue, Engine, Forward, GenKill, GenKillAnalysis, Results, ResultsCursor,
     ResultsRefCursor, ResultsVisitor,
 };
-pub use self::impls::{
-    borrows::Borrows, DefinitelyInitializedPlaces, EverInitializedPlaces, MaybeBorrowedLocals,
-    MaybeInitializedPlaces, MaybeLiveLocals, MaybeMutBorrowedLocals, MaybeRequiresStorage,
-    MaybeStorageLive, MaybeUninitializedPlaces,
-};
 
 use self::move_paths::MoveData;
 
 pub mod drop_flag_effects;
 mod framework;
-mod impls;
+pub mod impls;
 pub mod move_paths;
 
 pub(crate) mod indexes {

src/librustc_mir/transform/check_consts/validation.rs

@@ -20,7 +20,7 @@ use super::qualifs::{self, CustomEq, HasMutInterior, NeedsDrop};
 use super::resolver::FlowSensitiveAnalysis;
 use super::{is_lang_panic_fn, ConstCx, ConstKind, Qualif};
 use crate::const_eval::{is_const_fn, is_unstable_const_fn};
-use crate::dataflow::MaybeMutBorrowedLocals;
+use crate::dataflow::impls::MaybeMutBorrowedLocals;
 use crate::dataflow::{self, Analysis};
 
 // We are using `MaybeMutBorrowedLocals` as a proxy for whether an item may have been mutated

src/librustc_mir/transform/elaborate_drops.rs

@@ -1,10 +1,10 @@
 use crate::dataflow;
+use crate::dataflow::impls::{MaybeInitializedPlaces, MaybeUninitializedPlaces};
 use crate::dataflow::move_paths::{LookupResult, MoveData, MovePathIndex};
 use crate::dataflow::on_lookup_result_bits;
 use crate::dataflow::MoveDataParamEnv;
 use crate::dataflow::{on_all_children_bits, on_all_drop_children_bits};
 use crate::dataflow::{Analysis, ResultsCursor};
-use crate::dataflow::{MaybeInitializedPlaces, MaybeUninitializedPlaces};
 use crate::transform::{MirPass, MirSource};
 use crate::util::elaborate_drops::{elaborate_drop, DropFlagState, Unwind};
 use crate::util::elaborate_drops::{DropElaborator, DropFlagMode, DropStyle};

src/librustc_mir/transform/generator.rs

@@ -49,10 +49,10 @@
 //! For generators with state 1 (returned) and state 2 (poisoned) it does nothing.
 //! Otherwise it drops all the values in scope at the last suspension point.
 
-use crate::dataflow::{self, Analysis};
-use crate::dataflow::{
+use crate::dataflow::impls::{
     MaybeBorrowedLocals, MaybeLiveLocals, MaybeRequiresStorage, MaybeStorageLive,
 };
+use crate::dataflow::{self, Analysis};
 use crate::transform::no_landing_pads::no_landing_pads;
 use crate::transform::simplify;
 use crate::transform::{MirPass, MirSource};

src/librustc_mir/transform/rustc_peek.rs

@@ -9,14 +9,14 @@ use rustc_index::bit_set::BitSet;
 use rustc_middle::mir::{self, Body, Local, Location};
 use rustc_middle::ty::{self, Ty, TyCtxt};
 
+use crate::dataflow::impls::{
+    DefinitelyInitializedPlaces, MaybeInitializedPlaces, MaybeLiveLocals, MaybeMutBorrowedLocals,
+    MaybeUninitializedPlaces,
+};
 use crate::dataflow::move_paths::{HasMoveData, MoveData};
 use crate::dataflow::move_paths::{LookupResult, MovePathIndex};
-use crate::dataflow::MaybeMutBorrowedLocals;
 use crate::dataflow::MoveDataParamEnv;
 use crate::dataflow::{Analysis, Results, ResultsCursor};
-use crate::dataflow::{
-    DefinitelyInitializedPlaces, MaybeInitializedPlaces, MaybeLiveLocals, MaybeUninitializedPlaces,
-};
 
 pub struct SanityCheck;