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88 lines
3.1 KiB
88 lines
3.1 KiB
8 years ago
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'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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// 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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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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// 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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