1 files changed, 125 insertions, 0 deletions
diff --git a/tvix/eval/src/compiler/optimiser.rs b/tvix/eval/src/compiler/optimiser.rs
new file mode 100644
index 0000000000..48960d355c
--- /dev/null
+++ b/tvix/eval/src/compiler/optimiser.rs
@@ -0,0 +1,125 @@
+//! Helper functions for extending the compiler with more linter-like
+//! functionality while compiling (i.e. smarter warnings).
+
+use super::*;
+
+use ast::Expr;
+
+/// Optimise the given expression where possible.
+pub(super) fn optimise_expr(c: &mut Compiler, slot: LocalIdx, expr: ast::Expr) -> ast::Expr {
+    match expr {
+        Expr::BinOp(_) => optimise_bin_op(c, slot, expr),
+        _ => expr,
+    }
+}
+
+enum LitBool {
+    Expr(Expr),
+    True(Expr),
+    False(Expr),
+}
+
+/// Is this a literal boolean, or something else?
+fn is_lit_bool(expr: ast::Expr) -> LitBool {
+    if let ast::Expr::Ident(ident) = &expr {
+        match ident.ident_token().unwrap().text() {
+            "true" => LitBool::True(expr),
+            "false" => LitBool::False(expr),
+            _ => LitBool::Expr(expr),
+        }
+    } else {
+        LitBool::Expr(expr)
+    }
+}
+
+/// Detect useless binary operations (i.e. useless bool comparisons).
+fn optimise_bin_op(c: &mut Compiler, slot: LocalIdx, expr: ast::Expr) -> ast::Expr {
+    use ast::BinOpKind;
+
+    // bail out of this check if the user has overridden either `true`
+    // or `false` identifiers. Note that they will have received a
+    // separate warning about this for shadowing the global(s).
+    if c.is_user_defined("true") || c.is_user_defined("false") {
+        return expr;
+    }
+
+    if let Expr::BinOp(op) = &expr {
+        let lhs = is_lit_bool(op.lhs().unwrap());
+        let rhs = is_lit_bool(op.rhs().unwrap());
+
+        match (op.operator().unwrap(), lhs, rhs) {
+            // useless `false` arm in `||` expression
+            (BinOpKind::Or, LitBool::False(f), LitBool::Expr(other))
+            | (BinOpKind::Or, LitBool::Expr(other), LitBool::False(f)) => {
+                c.emit_warning(
+                    &f,
+                    WarningKind::UselessBoolOperation(
+                        "this `false` has no effect on the result of the comparison",
+                    ),
+                );
+
+                return other;
+            }
+
+            // useless `true` arm in `&&` expression
+            (BinOpKind::And, LitBool::True(t), LitBool::Expr(other))
+            | (BinOpKind::And, LitBool::Expr(other), LitBool::True(t)) => {
+                c.emit_warning(
+                    &t,
+                    WarningKind::UselessBoolOperation(
+                        "this `true` has no effect on the result of the comparison",
+                    ),
+                );
+
+                return other;
+            }
+
+            // useless `||` expression (one arm is `true`), return
+            // `true` directly (and warn about dead code on the right)
+            (BinOpKind::Or, LitBool::True(t), LitBool::Expr(other)) => {
+                c.emit_warning(
+                    op,
+                    WarningKind::UselessBoolOperation("this expression is always true"),
+                );
+
+                c.compile_dead_code(slot, other);
+
+                return t;
+            }
+
+            (BinOpKind::Or, _, LitBool::True(t)) | (BinOpKind::Or, LitBool::True(t), _) => {
+                c.emit_warning(
+                    op,
+                    WarningKind::UselessBoolOperation("this expression is always true"),
+                );
+
+                return t;
+            }
+
+            // useless `&&` expression (one arm is `false), same as above
+            (BinOpKind::And, LitBool::False(f), LitBool::Expr(other)) => {
+                c.emit_warning(
+                    op,
+                    WarningKind::UselessBoolOperation("this expression is always false"),
+                );
+
+                c.compile_dead_code(slot, other);
+
+                return f;
+            }
+
+            (BinOpKind::And, _, LitBool::False(f)) | (BinOpKind::Or, LitBool::False(f), _) => {
+                c.emit_warning(
+                    op,
+                    WarningKind::UselessBoolOperation("this expression is always false"),
+                );
+
+                return f;
+            }
+
+            _ => { /* nothing to optimise */ }
+        }
+    }
+
+    expr
+}