146 lines
4.5 KiB
Rust
146 lines
4.5 KiB
Rust
use crate::implementation::{TestContext, TestContextImpl};
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use salsa::debug::DebugQueryTable;
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use salsa::Durability;
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#[salsa::query_group(Constants)]
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pub(crate) trait ConstantsDatabase: TestContext {
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#[salsa::input]
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fn input(&self, key: char) -> usize;
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fn add(&self, key1: char, key2: char) -> usize;
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fn add3(&self, key1: char, key2: char, key3: char) -> usize;
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}
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fn add(db: &dyn ConstantsDatabase, key1: char, key2: char) -> usize {
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db.log().add(format!("add({}, {})", key1, key2));
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db.input(key1) + db.input(key2)
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}
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fn add3(db: &dyn ConstantsDatabase, key1: char, key2: char, key3: char) -> usize {
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db.log().add(format!("add3({}, {}, {})", key1, key2, key3));
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db.add(key1, key2) + db.input(key3)
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}
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// Test we can assign a constant and things will be correctly
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// recomputed afterwards.
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#[test]
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fn invalidate_constant() {
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let db = &mut TestContextImpl::default();
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db.set_input_with_durability('a', 44, Durability::HIGH);
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db.set_input_with_durability('b', 22, Durability::HIGH);
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assert_eq!(db.add('a', 'b'), 66);
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db.set_input_with_durability('a', 66, Durability::HIGH);
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assert_eq!(db.add('a', 'b'), 88);
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}
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#[test]
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fn invalidate_constant_1() {
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let db = &mut TestContextImpl::default();
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// Not constant:
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db.set_input('a', 44);
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assert_eq!(db.add('a', 'a'), 88);
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// Becomes constant:
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db.set_input_with_durability('a', 44, Durability::HIGH);
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assert_eq!(db.add('a', 'a'), 88);
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// Invalidates:
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db.set_input_with_durability('a', 33, Durability::HIGH);
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assert_eq!(db.add('a', 'a'), 66);
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}
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// Test cases where we assign same value to 'a' after declaring it a
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// constant.
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#[test]
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fn set_after_constant_same_value() {
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let db = &mut TestContextImpl::default();
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db.set_input_with_durability('a', 44, Durability::HIGH);
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db.set_input_with_durability('a', 44, Durability::HIGH);
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db.set_input('a', 44);
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}
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#[test]
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fn not_constant() {
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let mut db = TestContextImpl::default();
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db.set_input('a', 22);
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db.set_input('b', 44);
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assert_eq!(db.add('a', 'b'), 66);
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assert_eq!(Durability::LOW, AddQuery.in_db(&db).durability(('a', 'b')));
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}
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#[test]
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fn durability() {
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let mut db = TestContextImpl::default();
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db.set_input_with_durability('a', 22, Durability::HIGH);
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db.set_input_with_durability('b', 44, Durability::HIGH);
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assert_eq!(db.add('a', 'b'), 66);
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assert_eq!(Durability::HIGH, AddQuery.in_db(&db).durability(('a', 'b')));
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}
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#[test]
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fn mixed_constant() {
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let mut db = TestContextImpl::default();
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db.set_input_with_durability('a', 22, Durability::HIGH);
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db.set_input('b', 44);
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assert_eq!(db.add('a', 'b'), 66);
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assert_eq!(Durability::LOW, AddQuery.in_db(&db).durability(('a', 'b')));
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}
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#[test]
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fn becomes_constant_with_change() {
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let mut db = TestContextImpl::default();
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db.set_input('a', 22);
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db.set_input('b', 44);
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assert_eq!(db.add('a', 'b'), 66);
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assert_eq!(Durability::LOW, AddQuery.in_db(&db).durability(('a', 'b')));
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db.set_input_with_durability('a', 23, Durability::HIGH);
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assert_eq!(db.add('a', 'b'), 67);
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assert_eq!(Durability::LOW, AddQuery.in_db(&db).durability(('a', 'b')));
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db.set_input_with_durability('b', 45, Durability::HIGH);
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assert_eq!(db.add('a', 'b'), 68);
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assert_eq!(Durability::HIGH, AddQuery.in_db(&db).durability(('a', 'b')));
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db.set_input_with_durability('b', 45, Durability::MEDIUM);
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assert_eq!(db.add('a', 'b'), 68);
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assert_eq!(Durability::MEDIUM, AddQuery.in_db(&db).durability(('a', 'b')));
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}
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// Test a subtle case in which an input changes from constant to
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// non-constant, but its value doesn't change. If we're not careful,
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// this can cause us to incorrectly consider derived values as still
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// being constant.
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#[test]
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fn constant_to_non_constant() {
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let mut db = TestContextImpl::default();
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db.set_input_with_durability('a', 11, Durability::HIGH);
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db.set_input_with_durability('b', 22, Durability::HIGH);
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db.set_input_with_durability('c', 33, Durability::HIGH);
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// Here, `add3` invokes `add`, which yields 33. Both calls are
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// constant.
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assert_eq!(db.add3('a', 'b', 'c'), 66);
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db.set_input('a', 11);
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// Here, `add3` invokes `add`, which *still* yields 33, but which
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// is no longer constant. Since value didn't change, we might
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// preserve `add3` unchanged, not noticing that it is no longer
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// constant.
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assert_eq!(db.add3('a', 'b', 'c'), 66);
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// In that case, we would not get the correct result here, when
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// 'a' changes *again*.
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db.set_input('a', 22);
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assert_eq!(db.add3('a', 'b', 'c'), 77);
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}
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