some bytecode implementation, does not work yet

1 files changed, 43 insertions, 0 deletions

diff --git a/src/bitset.rs b/src/bitset.rs
new file mode 100644
index 0000000..eae2596
--- /dev/null
+++ b/src/bitset.rs
@@ -0,0 +1,43 @@
+#[derive(Clone, PartialEq, Eq)]
+pub struct BitSet {
+    data: Vec<u32>,
+    size: usize,
+}
+
+const BITS: usize = 32;
+
+impl BitSet {
+    pub fn new(size: usize) -> Self {
+        Self {
+            size,
+            data: vec![0; size.div_ceil(32)],
+        }
+    }
+
+    pub fn set(&mut self, bit: usize, val: bool) {
+        assert!(bit < self.size);
+        let idx = bit / BITS;
+        let bit = bit % BITS;
+
+        if val {
+            self.data[idx] |= 1 << bit;
+        } else {
+            self.data[idx] &= !(1 << bit);
+        }
+    }
+
+    pub fn get(&self, bit: usize) -> bool {
+        assert!(bit < self.size);
+        let idx = bit / BITS;
+        let bit = bit % BITS;
+
+        (self.data[idx] & (1 << bit)) != 0
+    }
+
+    pub fn set_all(&mut self, val: bool) {
+        let val = if val { !0 } else { 0 };
+        for d in self.data.iter_mut() {
+            *d = val;
+        }
+    }
+}