Merge #796

796: epoch: Remove ptr-to-int casts r=taiki-e a=taiki-e

Use [this hack](rust-lang/miri#1866 (comment)) to fix compatibility issues with Miri (see #490 (comment) for details). 

Due to the #545, still not compatible with stacked borrows. This will be fixed by the subsequent PR (#871).

Note: this is a breaking change because changes API of Pointable and Pointer traits

Fixes #579

Co-authored-by: Taiki Endo <[email protected]>

Author: bors[bot]

Cargo.toml

@@ -86,3 +86,7 @@ members = [
   "crossbeam-skiplist",
   "crossbeam-utils",
 ]
+
+[patch.crates-io]
+# https://github.com/matklad/once_cell/pull/185
+once_cell = { git = "https://github.com/saethlin/once_cell.git", rev = "4aa5ac4aa30b9eed4a0848f3ad22a5eeb025760d" }

ci/miri.sh

@@ -9,33 +9,36 @@ echo
 
 export RUSTFLAGS="${RUSTFLAGS:-} -Z randomize-layout"
 
-MIRIFLAGS="-Zmiri-symbolic-alignment-check -Zmiri-disable-isolation" \
+MIRIFLAGS="-Zmiri-strict-provenance -Zmiri-symbolic-alignment-check -Zmiri-disable-isolation" \
     cargo miri test \
     -p crossbeam-queue \
     -p crossbeam-utils 2>&1 | ts -i '%.s  '
 
 # -Zmiri-ignore-leaks is needed because we use detached threads in tests/docs: https://github.com/rust-lang/miri/issues/1371
-MIRIFLAGS="-Zmiri-symbolic-alignment-check -Zmiri-disable-isolation -Zmiri-ignore-leaks" \
+MIRIFLAGS="-Zmiri-strict-provenance -Zmiri-symbolic-alignment-check -Zmiri-disable-isolation -Zmiri-ignore-leaks" \
     cargo miri test \
     -p crossbeam-channel 2>&1 | ts -i '%.s  '
 
-# -Zmiri-ignore-leaks is needed for https://github.com/crossbeam-rs/crossbeam/issues/579
 # -Zmiri-disable-stacked-borrows is needed for https://github.com/crossbeam-rs/crossbeam/issues/545
-MIRIFLAGS="-Zmiri-symbolic-alignment-check -Zmiri-disable-isolation -Zmiri-disable-stacked-borrows -Zmiri-ignore-leaks" \
+MIRIFLAGS="-Zmiri-strict-provenance -Zmiri-symbolic-alignment-check -Zmiri-disable-isolation -Zmiri-disable-stacked-borrows" \
+    cargo miri test \
+    -p crossbeam-epoch 2>&1 | ts -i '%.s  '
+
+# -Zmiri-ignore-leaks is needed for https://github.com/crossbeam-rs/crossbeam/issues/614
+# -Zmiri-disable-stacked-borrows is needed for https://github.com/crossbeam-rs/crossbeam/issues/545
+MIRIFLAGS="-Zmiri-strict-provenance -Zmiri-symbolic-alignment-check -Zmiri-disable-isolation -Zmiri-disable-stacked-borrows -Zmiri-ignore-leaks" \
     cargo miri test \
-    -p crossbeam-epoch \
     -p crossbeam-skiplist 2>&1 | ts -i '%.s  '
 
-# -Zmiri-ignore-leaks is needed for https://github.com/crossbeam-rs/crossbeam/issues/579
 # -Zmiri-disable-stacked-borrows is needed for https://github.com/crossbeam-rs/crossbeam/issues/545
 # -Zmiri-compare-exchange-weak-failure-rate=0.0 is needed because some sequential tests (e.g.,
 # doctest of Stealer::steal) incorrectly assume that sequential weak CAS will never fail.
 # -Zmiri-preemption-rate=0 is needed because this code technically has UB and Miri catches that.
-MIRIFLAGS="-Zmiri-symbolic-alignment-check -Zmiri-disable-stacked-borrows -Zmiri-ignore-leaks -Zmiri-compare-exchange-weak-failure-rate=0.0 -Zmiri-preemption-rate=0" \
+MIRIFLAGS="-Zmiri-strict-provenance -Zmiri-symbolic-alignment-check -Zmiri-disable-stacked-borrows -Zmiri-compare-exchange-weak-failure-rate=0.0 -Zmiri-preemption-rate=0" \
     cargo miri test \
     -p crossbeam-deque 2>&1 | ts -i '%.s  '
 
-# -Zmiri-ignore-leaks is needed for https://github.com/crossbeam-rs/crossbeam/issues/579
-MIRIFLAGS="-Zmiri-symbolic-alignment-check -Zmiri-ignore-leaks" \
+# -Zmiri-disable-stacked-borrows is needed for https://github.com/crossbeam-rs/crossbeam/issues/545
+MIRIFLAGS="-Zmiri-strict-provenance -Zmiri-symbolic-alignment-check -Zmiri-disable-stacked-borrows" \
     cargo miri test \
     -p crossbeam 2>&1 | ts -i '%.s  '