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'use strict';
// Flags: --expose-gc
const common = require('../../common');
const assert = require('assert');
const test_reference = require(`./build/${common.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.
function runTests(i, title, tests) {
if (tests[i]) {
if (typeof tests[i] === 'string') {
title = tests[i];
runTests(i + 1, title, tests);
} else {
try {
tests[i]();
} catch (e) {
console.error(`Test failed: ${title}`);
throw e;
}
setImmediate(() => {
global.gc();
runTests(i + 1, title, tests);
});
}
}
}
runTests(0, undefined, [
'External value without a finalizer',
() => {
const value = test_reference.createExternal();
assert.strictEqual(test_reference.finalizeCount, 0);
assert.strictEqual(typeof value, 'object');
test_reference.checkExternal(value);
},
() => {
assert.strictEqual(test_reference.finalizeCount, 0);
},
'External value with a finalizer',
() => {
const value = test_reference.createExternalWithFinalize();
assert.strictEqual(test_reference.finalizeCount, 0);
assert.strictEqual(typeof value, 'object');
test_reference.checkExternal(value);
},
() => {
assert.strictEqual(test_reference.finalizeCount, 1);
},
'Weak reference',
() => {
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
assert.strictEqual(test_reference.referenceValue, undefined);
assert.strictEqual(test_reference.finalizeCount, 1);
test_reference.deleteReference();
},
'Strong reference',
() => {
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
assert.strictEqual(test_reference.finalizeCount, 0);
test_reference.deleteReference();
},
() => {
// Value should be GC'd because the strong ref was deleted
assert.strictEqual(test_reference.finalizeCount, 1);
},
'Strong reference, increment then decrement to weak reference',
() => {
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
assert.strictEqual(test_reference.finalizeCount, 0);
assert.strictEqual(test_reference.incrementRefcount(), 2);
},
() => {
// Value should NOT be GC'd because there is a strong ref
assert.strictEqual(test_reference.finalizeCount, 0);
assert.strictEqual(test_reference.decrementRefcount(), 1);
},
() => {
// Value should NOT be GC'd because there is a strong ref
assert.strictEqual(test_reference.finalizeCount, 0);
assert.strictEqual(test_reference.decrementRefcount(), 0);
},
() => {
// Value should be GC'd because the ref is now weak!
assert.strictEqual(test_reference.finalizeCount, 1);
test_reference.deleteReference();
},
() => {
// Value was already GC'd
assert.strictEqual(test_reference.finalizeCount, 1);
},
]);
// 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 guarranteed, 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();
}
|
