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0a734fec88
PR-URL: https://github.com/nodejs/node/pull/12864 Ref: https://github.com/nodejs/node/pull/12551#issuecomment-297949361 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
91 lines
3.3 KiB
JavaScript
91 lines
3.3 KiB
JavaScript
'use strict';
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// Flags: --expose-gc
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const common = require('../../common');
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const assert = require('assert');
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const test_reference = require(`./build/${common.buildType}/test_reference`);
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// This test script uses external values with finalizer callbacks
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// in order to track when values get garbage-collected. Each invocation
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// of a finalizer callback increments the finalizeCount property.
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assert.strictEqual(test_reference.finalizeCount, 0);
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{
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// External value without a finalizer
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let value = test_reference.createExternal();
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assert.strictEqual(test_reference.finalizeCount, 0);
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assert.strictEqual(typeof value, 'object');
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test_reference.checkExternal(value);
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value = null;
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global.gc();
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assert.strictEqual(test_reference.finalizeCount, 0);
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}
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{
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// External value with a finalizer
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let value = test_reference.createExternalWithFinalize();
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assert.strictEqual(test_reference.finalizeCount, 0);
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assert.strictEqual(typeof value, 'object');
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test_reference.checkExternal(value);
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value = null;
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global.gc();
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assert.strictEqual(test_reference.finalizeCount, 1);
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}
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{
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// Strong reference
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let value = test_reference.createExternalWithFinalize();
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assert.strictEqual(test_reference.finalizeCount, 0);
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test_reference.createReference(value, 1);
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assert.strictEqual(test_reference.referenceValue, value);
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value = null;
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global.gc(); // Value should NOT be GC'd because there is a strong ref
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assert.strictEqual(test_reference.finalizeCount, 0);
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test_reference.deleteReference();
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global.gc(); // Value should be GC'd because the strong ref was deleted
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assert.strictEqual(test_reference.finalizeCount, 1);
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}
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{
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// Strong reference, increment then decrement to weak reference
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let value = test_reference.createExternalWithFinalize();
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assert.strictEqual(test_reference.finalizeCount, 0);
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test_reference.createReference(value, 1);
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value = null;
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global.gc(); // Value should NOT be GC'd because there is a strong ref
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assert.strictEqual(test_reference.finalizeCount, 0);
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assert.strictEqual(test_reference.incrementRefcount(), 2);
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global.gc(); // Value should NOT be GC'd because there is a strong ref
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assert.strictEqual(test_reference.finalizeCount, 0);
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assert.strictEqual(test_reference.decrementRefcount(), 1);
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global.gc(); // Value should NOT be GC'd because there is a strong ref
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assert.strictEqual(test_reference.finalizeCount, 0);
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assert.strictEqual(test_reference.decrementRefcount(), 0);
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global.gc(); // Value should be GC'd because the ref is now weak!
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assert.strictEqual(test_reference.finalizeCount, 1);
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test_reference.deleteReference();
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global.gc(); // Value was already GC'd
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assert.strictEqual(test_reference.finalizeCount, 1);
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}
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{
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// Weak reference
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let value = test_reference.createExternalWithFinalize();
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assert.strictEqual(test_reference.finalizeCount, 0);
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test_reference.createReference(value, 0);
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assert.strictEqual(test_reference.referenceValue, value);
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value = null;
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setImmediate(common.mustCall(() => {
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// This test only works if gc() is called from an immediate callback.
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global.gc(); // Value should be GC'd because there is only a weak ref
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assert.strictEqual(test_reference.referenceValue, undefined);
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assert.strictEqual(test_reference.finalizeCount, 1);
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test_reference.deleteReference();
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}));
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}
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