1 files changed, 67 insertions, 0 deletions
diff --git a/vendor/varisat/src/clause.rs b/vendor/varisat/src/clause.rs
new file mode 100644
index 000000000..0d3591858
--- /dev/null
+++ b/vendor/varisat/src/clause.rs
@@ -0,0 +1,67 @@
+//! Clause storage.
+use std::slice;
+
+use varisat_formula::{lit::LitIdx, Lit};
+
+pub mod activity;
+pub mod alloc;
+pub mod assess;
+pub mod db;
+pub mod gc;
+pub mod header;
+pub mod reduce;
+
+pub use activity::{bump_clause_activity, decay_clause_activities, ClauseActivity};
+pub use alloc::{ClauseAlloc, ClauseRef};
+pub use assess::{assess_learned_clause, bump_clause};
+pub use db::{ClauseDb, Tier};
+pub use gc::collect_garbage;
+pub use header::ClauseHeader;
+
+use header::HEADER_LEN;
+
+/// A clause.
+///
+/// This is stoed in a [`ClauseAlloc`] and thus must have a representation compatible with slice of
+/// [`LitIdx`] values.
+///
+/// It would be nicer to use a DST struct with two members and `repr(C)`, but while that can be
+/// declared in stable rust, it's almost impossible to work with.
+#[repr(transparent)]
+pub struct Clause {
+    data: [LitIdx],
+}
+
+impl Clause {
+    /// The clause's header
+    pub fn header(&self) -> &ClauseHeader {
+        unsafe {
+            let header_ptr = self.data.as_ptr() as *const ClauseHeader;
+            &*header_ptr
+        }
+    }
+
+    /// Mutable reference to the clause's header
+    pub fn header_mut(&mut self) -> &mut ClauseHeader {
+        unsafe {
+            let header_ptr = self.data.as_mut_ptr() as *mut ClauseHeader;
+            &mut *header_ptr
+        }
+    }
+
+    /// The clause's literals
+    pub fn lits(&self) -> &[Lit] {
+        unsafe {
+            let lit_ptr = self.data.as_ptr().add(HEADER_LEN) as *const Lit;
+            slice::from_raw_parts(lit_ptr, self.data.len() - HEADER_LEN)
+        }
+    }
+
+    /// Mutable slice of the clause's literals
+    pub fn lits_mut(&mut self) -> &mut [Lit] {
+        unsafe {
+            let lit_ptr = self.data.as_mut_ptr().add(HEADER_LEN) as *mut Lit;
+            slice::from_raw_parts_mut(lit_ptr, self.data.len() - HEADER_LEN)
+        }
+    }
+}