Add integration test for unwind safety

tests/integration/mod.rs

@@ -0,0 +1 @@
+mod panic;

tests/integration/panic.rs

@@ -0,0 +1,161 @@
+use chalk_integration::db::ChalkDatabase;
+use chalk_integration::query::LoweringDatabase;
+use chalk_ir::interner::ChalkIr;
+use chalk_ir::AssocTypeId;
+use chalk_ir::Goal;
+use chalk_ir::ImplId;
+use chalk_ir::InEnvironment;
+use chalk_ir::OpaqueTyId;
+use chalk_ir::Parameter;
+use chalk_ir::ProgramClause;
+use chalk_ir::StructId;
+use chalk_ir::TraitId;
+use chalk_ir::TypeName;
+use chalk_ir::UCanonical;
+use chalk_rust_ir::AssociatedTyDatum;
+use chalk_rust_ir::AssociatedTyValue;
+use chalk_rust_ir::AssociatedTyValueId;
+use chalk_rust_ir::ImplDatum;
+use chalk_rust_ir::OpaqueTyDatum;
+use chalk_rust_ir::StructDatum;
+use chalk_rust_ir::TraitDatum;
+use chalk_rust_ir::WellKnownTrait;
+use chalk_solve::RustIrDatabase;
+use chalk_solve::Solution;
+use chalk_solve::SolverChoice;
+use std::sync::Arc;
+
+#[derive(Debug, Default)]
+struct MockDatabase {
+    chalk_db: ChalkDatabase,
+    panic: bool,
+}
+
+impl MockDatabase {
+    pub fn with(program_text: &str, solver_choice: SolverChoice) -> Self {
+        let mut db = Self::default();
+        db.chalk_db
+            .set_program_text(Arc::new(program_text.to_string()));
+        db.chalk_db.set_solver_choice(solver_choice);
+        db
+    }
+
+    pub fn solve(
+        &self,
+        goal: &UCanonical<InEnvironment<Goal<ChalkIr>>>,
+    ) -> Option<Solution<ChalkIr>> {
+        let solver = self.chalk_db.solver();
+        let solution = solver.lock().unwrap().solve(self, goal);
+        solution
+    }
+}
+
+impl RustIrDatabase<ChalkIr> for MockDatabase {
+    fn custom_clauses(&self) -> Vec<ProgramClause<ChalkIr>> {
+        if self.panic {
+            unimplemented!()
+        } else {
+            self.chalk_db.custom_clauses()
+        }
+    }
+
+    fn associated_ty_data(&self, ty: AssocTypeId<ChalkIr>) -> Arc<AssociatedTyDatum<ChalkIr>> {
+        self.chalk_db.associated_ty_data(ty)
+    }
+
+    fn trait_datum(&self, id: TraitId<ChalkIr>) -> Arc<TraitDatum<ChalkIr>> {
+        self.chalk_db.trait_datum(id)
+    }
+
+    fn impl_datum(&self, id: ImplId<ChalkIr>) -> Arc<ImplDatum<ChalkIr>> {
+        self.chalk_db.impl_datum(id)
+    }
+
+    fn associated_ty_value(
+        &self,
+        id: AssociatedTyValueId<ChalkIr>,
+    ) -> Arc<AssociatedTyValue<ChalkIr>> {
+        self.chalk_db.associated_ty_value(id)
+    }
+
+    fn opaque_ty_data(&self, id: OpaqueTyId<ChalkIr>) -> Arc<OpaqueTyDatum<ChalkIr>> {
+        self.chalk_db.opaque_ty_data(id)
+    }
+
+    fn struct_datum(&self, id: StructId<ChalkIr>) -> Arc<StructDatum<ChalkIr>> {
+        self.chalk_db.struct_datum(id)
+    }
+
+    fn as_struct_id(&self, type_name: &TypeName<ChalkIr>) -> Option<StructId<ChalkIr>> {
+        self.chalk_db.as_struct_id(type_name)
+    }
+
+    fn impls_for_trait(
+        &self,
+        trait_id: TraitId<ChalkIr>,
+        parameters: &[Parameter<ChalkIr>],
+    ) -> Vec<ImplId<ChalkIr>> {
+        self.chalk_db.impls_for_trait(trait_id, parameters)
+    }
+
+    fn local_impls_to_coherence_check(&self, trait_id: TraitId<ChalkIr>) -> Vec<ImplId<ChalkIr>> {
+        self.chalk_db.local_impls_to_coherence_check(trait_id)
+    }
+
+    fn impl_provided_for(
+        &self,
+        auto_trait_id: TraitId<ChalkIr>,
+        struct_id: StructId<ChalkIr>,
+    ) -> bool {
+        self.chalk_db.impl_provided_for(auto_trait_id, struct_id)
+    }
+
+    fn well_known_trait_id(&self, well_known_trait: WellKnownTrait) -> Option<TraitId<ChalkIr>> {
+        self.chalk_db.well_known_trait_id(well_known_trait)
+    }
+
+    fn interner(&self) -> &ChalkIr {
+        &ChalkIr
+    }
+}
+
+#[test]
+fn unwind_safety() {
+    use self::MockDatabase;
+    use chalk_integration::lowering::LowerGoal;
+    use chalk_integration::query::LoweringDatabase;
+    use chalk_solve::ext::GoalExt;
+    use std::panic;
+
+    // lower program
+    let mut db = lower_program_with_db! {
+        program {
+            struct Foo { }
+            trait Bar { }
+            impl Bar for Foo { }
+        }
+        database MockDatabase
+    };
+
+    let program = db.chalk_db.checked_program().unwrap();
+
+    // lower goal
+    let goal = lower_goal! {
+        goal {
+            Foo: Bar
+        }
+        program &*program
+    };
+    let peeled_goal = goal.into_peeled_goal(db.interner());
+
+    // solve goal but this will panic
+    db.panic = true;
+    let result = panic::catch_unwind(|| {
+        db.solve(&peeled_goal);
+    });
+    assert!(result.is_err() == true);
+
+    // solve again but without panicking this time
+    db.panic = false;
+    assert!(db.solve(&peeled_goal).is_some());
+}

tests/lib.rs

@@ -4,3 +4,5 @@ mod test_util;
 mod test;
 
 mod lowering;
+
+mod integration;

tests/test_util.rs

@@ -1,15 +1,35 @@
 #![allow(unused_macros)]
 
-macro_rules! lowering_success {
-    (program $program:tt) => {
+macro_rules! lower_program_with_db {
+    (program $program:tt database $database:ty) => {{
         let program_text = stringify!($program);
         assert!(program_text.starts_with("{"));
         assert!(program_text.ends_with("}"));
-        let result = chalk_integration::db::ChalkDatabase::with(
+        <$database>::with(
             &program_text[1..program_text.len() - 1],
             chalk_solve::SolverChoice::default(),
         )
-        .checked_program();
+    }};
+}
+
+macro_rules! lower_goal {
+    (goal $goal:tt program $program:expr) => {{
+        let goal_text = stringify!($goal);
+        assert!(goal_text.starts_with("{"));
+        assert!(goal_text.ends_with("}"));
+        chalk_parse::parse_goal(&goal_text[1..goal_text.len() - 1])
+            .unwrap()
+            .lower($program)
+            .unwrap()
+    }};
+}
+
+macro_rules! lowering_success {
+    (program $program:tt) => {
+        let result = lower_program_with_db!(
+            program $program
+            database chalk_integration::db::ChalkDatabase
+        ).checked_program();
         if let Err(ref e) = result {
             println!("lowering error: {}", e);
         }