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test.js
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'use strict';
// Flags: --expose-gc
const { buildType } = require('../../common');
const { gcUntil } = require('../../common/gc');
const assert = require('assert');
const test_reference = require(`./build/${buildType}/test_reference`);
// This test script uses external values with finalizer callbacks
// in order to track when values get garbage-collected. Each invocation
// of a finalizer callback increments the finalizeCount property.
assert.strictEqual(test_reference.finalizeCount, 0);
// Run each test function in sequence,
// with an async delay and GC call between each.
async function runTests() {
(() => {
const symbol = test_reference.createSymbol('testSym');
test_reference.createReference(symbol, 0);
assert.strictEqual(test_reference.referenceValue, symbol);
})();
test_reference.deleteReference();
(() => {
const symbol = test_reference.createSymbolFor('testSymFor');
test_reference.createReference(symbol, 0);
assert.strictEqual(test_reference.referenceValue, symbol);
})();
test_reference.deleteReference();
(() => {
const symbol = test_reference.createSymbolFor('testSymFor');
test_reference.createReference(symbol, 1);
assert.strictEqual(test_reference.referenceValue, symbol);
assert.strictEqual(test_reference.referenceValue, Symbol.for('testSymFor'));
})();
test_reference.deleteReference();
(() => {
const symbol = test_reference.createSymbolForEmptyString();
test_reference.createReference(symbol, 0);
assert.strictEqual(test_reference.referenceValue, Symbol.for(''));
})();
test_reference.deleteReference();
(() => {
const symbol = test_reference.createSymbolForEmptyString();
test_reference.createReference(symbol, 1);
assert.strictEqual(test_reference.referenceValue, symbol);
assert.strictEqual(test_reference.referenceValue, Symbol.for(''));
})();
test_reference.deleteReference();
assert.throws(() => test_reference.createSymbolForIncorrectLength(),
/Invalid argument/);
(() => {
const value = test_reference.createExternal();
assert.strictEqual(test_reference.finalizeCount, 0);
assert.strictEqual(typeof value, 'object');
test_reference.checkExternal(value);
})();
await gcUntil('External value without a finalizer',
() => (test_reference.finalizeCount === 0));
(() => {
const value = test_reference.createExternalWithFinalize();
assert.strictEqual(test_reference.finalizeCount, 0);
assert.strictEqual(typeof value, 'object');
test_reference.checkExternal(value);
})();
await gcUntil('External value with a finalizer',
() => (test_reference.finalizeCount === 1));
(() => {
const value = test_reference.createExternalWithFinalize();
assert.strictEqual(test_reference.finalizeCount, 0);
test_reference.createReference(value, 0);
assert.strictEqual(test_reference.referenceValue, value);
})();
// Value should be GC'd because there is only a weak ref
await gcUntil('Weak reference',
() => (test_reference.referenceValue === undefined &&
test_reference.finalizeCount === 1));
test_reference.deleteReference();
(() => {
const value = test_reference.createExternalWithFinalize();
assert.strictEqual(test_reference.finalizeCount, 0);
test_reference.createReference(value, 1);
assert.strictEqual(test_reference.referenceValue, value);
})();
// Value should NOT be GC'd because there is a strong ref
await gcUntil('Strong reference',
() => (test_reference.finalizeCount === 0));
test_reference.deleteReference();
await gcUntil('Strong reference (cont.d)',
() => (test_reference.finalizeCount === 1));
(() => {
const value = test_reference.createExternalWithFinalize();
assert.strictEqual(test_reference.finalizeCount, 0);
test_reference.createReference(value, 1);
})();
// Value should NOT be GC'd because there is a strong ref
await gcUntil('Strong reference, increment then decrement to weak reference',
() => (test_reference.finalizeCount === 0));
assert.strictEqual(test_reference.incrementRefcount(), 2);
// Value should NOT be GC'd because there is a strong ref
await gcUntil(
'Strong reference, increment then decrement to weak reference (cont.d-1)',
() => (test_reference.finalizeCount === 0));
assert.strictEqual(test_reference.decrementRefcount(), 1);
// Value should NOT be GC'd because there is a strong ref
await gcUntil(
'Strong reference, increment then decrement to weak reference (cont.d-2)',
() => (test_reference.finalizeCount === 0));
assert.strictEqual(test_reference.decrementRefcount(), 0);
// Value should be GC'd because the ref is now weak!
await gcUntil(
'Strong reference, increment then decrement to weak reference (cont.d-3)',
() => (test_reference.finalizeCount === 1));
test_reference.deleteReference();
// Value was already GC'd
await gcUntil(
'Strong reference, increment then decrement to weak reference (cont.d-4)',
() => (test_reference.finalizeCount === 1));
}
runTests();
// This test creates a napi_ref on an object that has
// been wrapped by napi_wrap and for which the finalizer
// for the wrap calls napi_delete_ref on that napi_ref.
//
// Since both the wrap and the reference use the same
// object the finalizer for the wrap and reference
// may run in the same gc and in any order.
//
// It does that to validate that napi_delete_ref can be
// called before the finalizer has been run for the
// reference (there is a finalizer behind the scenes even
// though it cannot be passed to napi_create_reference).
//
// Since the order is not guaranteed, run the
// test a number of times maximize the chance that we
// get a run with the desired order for the test.
//
// 1000 reliably recreated the problem without the fix
// required to ensure delete could be called before
// the finalizer in manual testing.
for (let i = 0; i < 1000; i++) {
const wrapObject = new Object();
test_reference.validateDeleteBeforeFinalize(wrapObject);
global.gc();
}