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Merge pull request rust-lang#4006 from JoJoDeveloping/tb-fix-3846-retag
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Fix rust-lang#3846 properly, so that subtrees can be skipped again
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RalfJung authored Dec 4, 2024
2 parents b4b0e03 + fceb304 commit 599aef2
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7 changes: 7 additions & 0 deletions src/tools/miri/bench-cargo-miri/string-replace/Cargo.lock
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3

[[package]]
name = "string-replace"
version = "0.1.0"
8 changes: 8 additions & 0 deletions src/tools/miri/bench-cargo-miri/string-replace/Cargo.toml
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[package]
name = "string-replace"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
1 change: 1 addition & 0 deletions src/tools/miri/bench-cargo-miri/string-replace/data.json
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You have 6 unread messages.","favoriteFruit":"banana"},{"_id":"6724e6fce8619d86c0389ccf","index":1,"guid":"ced7fbb7-3b1a-419b-9fc7-d47582bbb3ea","isActive":true,"balance":"$1,856.38","picture":"http://placehold.it/32x32","age":21,"eyeColor":"brown","name":"Olsen Larsen","gender":"male","company":"VERBUS","email":"[email protected]","phone":"+1 (936) 480-3749","address":"370 Losee Terrace, Churchill, Maine, 4040","about":"Consequat Lorem in laboris fugiat veniam tempor eiusmod eu incididunt enim do et qui. Sit commodo eu excepteur cillum ex tempor commodo ex ex laboris esse. Aute aute nulla dolore dolor do. Irure esse proident nostrud non. Incididunt velit reprehenderit incididunt laboris do. Consequat nulla est id ex veniam tempor. Sit Lorem magna cillum aliquip irure quis sit minim anim.\r\n","registered":"2016-07-12T02:08:39 -02:00","latitude":-12.843628,"longitude":-124.143829,"greeting":"Hello, Olsen Larsen! 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Labore culpa ut culpa veniam est est consectetur ipsum ex esse.\r\n","registered":"2014-04-26T01:20:19 -02:00","latitude":70.349258,"longitude":126.810102,"greeting":"Hello, Price Bolton! You have 10 unread messages.","favoriteFruit":"banana"},{"_id":"6724e6fc8bcb952208c159f9","index":7,"guid":"a4e6c6c8-3fe3-42de-ae28-79c16956d309","isActive":false,"balance":"$1,298.07","picture":"http://placehold.it/32x32","age":28,"eyeColor":"blue","name":"Gretchen Wynn","gender":"female","company":"TERASCAPE","email":"[email protected]","phone":"+1 (882) 447-2895","address":"973 Suydam Place, Shindler, Nebraska, 8094","about":"Anim mollit labore magna proident ipsum culpa enim deserunt dolore sunt veniam fugiat. Ad fugiat cupidatat nisi commodo dolore duis commodo nostrud est. Enim proident ullamco non adipisicing magna consequat mollit ad reprehenderit laboris. Ex quis duis anim id non commodo amet sunt est magna officia.\r\n","registered":"2021-08-13T08:51:32 -02:00","latitude":14.551848,"longitude":-27.142242,"greeting":"Hello, Gretchen Wynn! You have 7 unread messages.","favoriteFruit":"apple"},{"_id":"6724e6fcc8243c2dfa47f5d4","index":8,"guid":"27df20d5-c1d8-419b-ad38-bdd1e6094775","isActive":true,"balance":"$3,005.40","picture":"http://placehold.it/32x32","age":33,"eyeColor":"blue","name":"Chen Travis","gender":"male","company":"MEMORA","email":"[email protected]","phone":"+1 (980) 500-2406","address":"182 Dahlgreen Place, Baker, South Carolina, 9817","about":"Ad nisi consequat aliquip eiusmod aute pariatur est sint magna. Ad magna anim esse qui Lorem nulla veniam dolore eiusmod. Cillum consequat sit aliqua est proident exercitation eiusmod irure. Minim eu laboris ad incididunt enim sunt. Sunt in excepteur aute non tempor irure mollit laboris. Eu et duis ullamco dolor sint occaecat officia culpa ipsum anim anim eu veniam aliquip. Exercitation ipsum dolor sint cillum duis incididunt minim quis irure enim reprehenderit do do incididunt.\r\n","registered":"2019-09-01T02:57:37 -02:00","latitude":25.442301,"longitude":48.381036,"greeting":"Hello, Chen Travis! You have 1 unread messages.","favoriteFruit":"banana"}]
7 changes: 7 additions & 0 deletions src/tools/miri/bench-cargo-miri/string-replace/src/main.rs
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const TCB_INFO_JSON: &str = include_str!("../data.json");

fn main() {
let tcb_json = TCB_INFO_JSON;
let bad_tcb_json = tcb_json.replace("female", "male");
std::hint::black_box(bad_tcb_json);
}
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use super::AccessKind;
use super::tree::AccessRelatedness;

/// To speed up tree traversals, we want to skip traversing subtrees when we know the traversal will have no effect.
/// This is often the case for foreign accesses, since usually foreign accesses happen several times in a row, but also
/// foreign accesses are idempotent. In particular, see tests `foreign_read_is_noop_after_foreign_write` and `all_transitions_idempotent`.
/// Thus, for each node we keep track of the "strongest idempotent foreign access" (SIFA), i.e. which foreign access can be skipped.
/// Note that for correctness, it is not required that this is the strongest access, just any access it is idempotent under. In particular, setting
/// it to `None` is always correct, but the point of this optimization is to have it be as strong as possible so that more accesses can be skipped.
/// This enum represents the kinds of values we store:
/// - `None` means that the node (and its subtrees) are not (guaranteed to be) idempotent under any foreign access.
/// - `Read` means that the node (and its subtrees) are idempotent under foreign reads, but not (yet / necessarily) under foreign writes.
/// - `Write` means that the node (and its subtrees) are idempotent under foreign writes. This also implies that it is idempotent under foreign
/// reads, since reads are stronger than writes (see test `foreign_read_is_noop_after_foreign_write`). In other words, this node can be skipped
/// for all foreign accesses.
///
/// Since a traversal does not just visit a node, but instead the entire subtree, the SIFA field for a given node indicates that the access to
/// *the entire subtree* rooted at that node can be skipped. In order for this to work, we maintain the global invariant that at
/// each location, the SIFA at each child must be stronger than that at the parent. For normal reads and writes, this is easily accomplished by
/// tracking each foreign access as it occurs, so that then the next access can be skipped. This also obviously maintains the invariant, because
/// if a node undergoes a foreign access, then all its children also see this as a foreign access. However, the invariant is broken during retags,
/// because retags act across the entire allocation, but only emit a read event across a specific range. This means that for all nodes outside that
/// range, the invariant is potentially broken, since a new child with a weaker SIFA is inserted. Thus, during retags, special care is taken to
/// "manually" reset the parent's SIFA to be at least as strong as the new child's. This is accomplished with the `ensure_no_stronger_than` method.
///
/// Note that we derive Ord and PartialOrd, so the order in which variants are listed below matters:
/// None < Read < Write. Do not change that order. See the `test_order` test.
#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Debug, Default)]
pub enum IdempotentForeignAccess {
#[default]
None,
Read,
Write,
}

impl IdempotentForeignAccess {
/// Returns true if a node where the strongest idempotent foreign access is `self`
/// can skip the access `happening_next`. Note that if this returns
/// `true`, then the entire subtree will be skipped.
pub fn can_skip_foreign_access(self, happening_next: IdempotentForeignAccess) -> bool {
debug_assert!(happening_next.is_foreign());
// This ordering is correct. Intuitively, if the last access here was
// a foreign write, everything can be skipped, since after a foreign write,
// all further foreign accesses are idempotent
happening_next <= self
}

/// Updates `self` to account for a foreign access.
pub fn record_new(&mut self, just_happened: IdempotentForeignAccess) {
if just_happened.is_local() {
// If the access is local, reset it.
*self = IdempotentForeignAccess::None;
} else {
// Otherwise, keep it or stengthen it.
*self = just_happened.max(*self);
}
}

/// Returns true if this access is local.
pub fn is_local(self) -> bool {
matches!(self, IdempotentForeignAccess::None)
}

/// Returns true if this access is foreign, i.e. not local.
pub fn is_foreign(self) -> bool {
!self.is_local()
}

/// Constructs a foreign access from an `AccessKind`
pub fn from_foreign(acc: AccessKind) -> IdempotentForeignAccess {
match acc {
AccessKind::Read => Self::Read,
AccessKind::Write => Self::Write,
}
}

/// Usually, tree traversals have an `AccessKind` and an `AccessRelatedness`.
/// This methods converts these into the corresponding `IdempotentForeignAccess`, to be used
/// to e.g. invoke `can_skip_foreign_access`.
pub fn from_acc_and_rel(acc: AccessKind, rel: AccessRelatedness) -> IdempotentForeignAccess {
if rel.is_foreign() { Self::from_foreign(acc) } else { Self::None }
}

/// During retags, the SIFA needs to be weakened to account for children with weaker SIFAs being inserted.
/// Thus, this method is called from the bottom up on each parent, until it returns false, which means the
/// "children have stronger SIFAs" invariant is restored.
pub fn ensure_no_stronger_than(&mut self, strongest_allowed: IdempotentForeignAccess) -> bool {
if *self > strongest_allowed {
*self = strongest_allowed;
true
} else {
false
}
}
}

#[cfg(test)]
mod tests {
use super::IdempotentForeignAccess;

#[test]
fn test_order() {
// The internal logic relies on this order.
// Do not change.
assert!(IdempotentForeignAccess::None < IdempotentForeignAccess::Read);
assert!(IdempotentForeignAccess::Read < IdempotentForeignAccess::Write);
}
}
10 changes: 9 additions & 1 deletion src/tools/miri/src/borrow_tracker/tree_borrows/mod.rs
Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@ use crate::concurrency::data_race::NaReadType;
use crate::*;

pub mod diagnostics;
mod foreign_access_skipping;
mod perms;
mod tree;
mod unimap;
Expand Down Expand Up @@ -296,7 +297,14 @@ trait EvalContextPrivExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
this.machine.current_span(),
)?;
// Record the parent-child pair in the tree.
tree_borrows.new_child(orig_tag, new_tag, new_perm.initial_state, range, span)?;
tree_borrows.new_child(
orig_tag,
new_tag,
new_perm.initial_state,
range,
span,
new_perm.protector.is_some(),
)?;
drop(tree_borrows);

// Also inform the data race model (but only if any bytes are actually affected).
Expand Down
61 changes: 60 additions & 1 deletion src/tools/miri/src/borrow_tracker/tree_borrows/perms.rs
Original file line number Diff line number Diff line change
Expand Up @@ -48,6 +48,7 @@ enum PermissionPriv {
Disabled,
}
use self::PermissionPriv::*;
use super::foreign_access_skipping::IdempotentForeignAccess;

impl PartialOrd for PermissionPriv {
/// PermissionPriv is ordered by the reflexive transitive closure of
Expand Down Expand Up @@ -87,6 +88,28 @@ impl PermissionPriv {
fn compatible_with_protector(&self) -> bool {
!matches!(self, ReservedIM)
}

/// See `foreign_access_skipping.rs`. Computes the SIFA of a permission.
fn strongest_idempotent_foreign_access(&self, prot: bool) -> IdempotentForeignAccess {
match self {
// A protected non-conflicted Reserved will become conflicted under a foreign read,
// and is hence not idempotent under it.
ReservedFrz { conflicted } if prot && !conflicted => IdempotentForeignAccess::None,
// Otherwise, foreign reads do not affect Reserved
ReservedFrz { .. } => IdempotentForeignAccess::Read,
// Famously, ReservedIM survives foreign writes. It is never protected.
ReservedIM if prot => unreachable!("Protected ReservedIM should not exist!"),
ReservedIM => IdempotentForeignAccess::Write,
// Active changes on any foreign access (becomes Frozen/Disabled).
Active => IdempotentForeignAccess::None,
// Frozen survives foreign reads, but not writes.
Frozen => IdempotentForeignAccess::Read,
// Disabled survives foreign reads and writes. It survives them
// even if protected, because a protected `Disabled` is not initialized
// and does therefore not trigger UB.
Disabled => IdempotentForeignAccess::Write,
}
}
}

/// This module controls how each permission individually reacts to an access.
Expand Down Expand Up @@ -305,6 +328,13 @@ impl Permission {
(Disabled, _) => false,
}
}

/// Returns the strongest foreign action this node survives (without change),
/// where `prot` indicates if it is protected.
/// See `foreign_access_skipping`
pub fn strongest_idempotent_foreign_access(&self, prot: bool) -> IdempotentForeignAccess {
self.inner.strongest_idempotent_foreign_access(prot)
}
}

impl PermTransition {
Expand Down Expand Up @@ -575,7 +605,7 @@ mod propagation_optimization_checks {
impl Exhaustive for AccessRelatedness {
fn exhaustive() -> Box<dyn Iterator<Item = Self>> {
use AccessRelatedness::*;
Box::new(vec![This, StrictChildAccess, AncestorAccess, DistantAccess].into_iter())
Box::new(vec![This, StrictChildAccess, AncestorAccess, CousinAccess].into_iter())
}
}

Expand Down Expand Up @@ -634,6 +664,35 @@ mod propagation_optimization_checks {
}
}

#[test]
#[rustfmt::skip]
fn permission_sifa_is_correct() {
// Tests that `strongest_idempotent_foreign_access` is correct. See `foreign_access_skipping.rs`.
for perm in PermissionPriv::exhaustive() {
// Assert that adding a protector makes it less idempotent.
if perm.compatible_with_protector() {
assert!(perm.strongest_idempotent_foreign_access(true) <= perm.strongest_idempotent_foreign_access(false));
}
for prot in bool::exhaustive() {
if prot {
precondition!(perm.compatible_with_protector());
}
let access = perm.strongest_idempotent_foreign_access(prot);
// We now assert it is idempotent, and never causes UB.
// First, if the SIFA includes foreign reads, assert it is idempotent under foreign reads.
if access >= IdempotentForeignAccess::Read {
// We use `CousinAccess` here. We could also use `AncestorAccess`, since `transition::perform_access` treats these the same.
// The only place they are treated differently is in protector end accesses, but these are not handled here.
assert_eq!(perm, transition::perform_access(AccessKind::Read, AccessRelatedness::CousinAccess, perm, prot).unwrap());
}
// Then, if the SIFA includes foreign writes, assert it is idempotent under foreign writes.
if access >= IdempotentForeignAccess::Write {
assert_eq!(perm, transition::perform_access(AccessKind::Write, AccessRelatedness::CousinAccess, perm, prot).unwrap());
}
}
}
}

#[test]
// Check that all transitions are consistent with the order on PermissionPriv,
// i.e. Reserved -> Active -> Frozen -> Disabled
Expand Down
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