| <!DOCTYPE html> |
| <script src="../../resources/js-test.js"></script> |
| <script src="../../resources/gc.js"></script> |
| <body> |
| <script> |
| description('Tests that the internals.observeGC hook works.'); |
| |
| window.jsTestIsAsync = true; |
| |
| function runAsyncGC() { |
| return new Promise(resolve => asyncGC(resolve)); |
| } |
| |
| shouldBe('typeof internals.observeGC', '"function"', |
| 'this test requires window.internals'); |
| |
| var valueA, observationA, observationB, observationC; |
| |
| (async () => { |
| // "Generic Kid's Movie III": ... where nobody dies. |
| |
| // Do initialization work in an inner function to avoid references to |
| // objects remaining live on this function's stack frame. |
| // (http://crbug.com/595672/). |
| (function () { |
| valueA = {}; |
| observationA = internals.observeGC(valueA); |
| })(); |
| |
| await runAsyncGC(); |
| shouldBeFalse('observationA.wasCollected'); |
| // value ineligible for GC should not be flagged as collected |
| valueA = null; |
| observationA = null; |
| |
| // "Romeo and GCuliet": Romeo JavaScript finds G.uliet C.apulet and dies. |
| |
| // Do initialization work in an inner function to avoid references to |
| // objects remaining live on this function's stack frame. |
| // (http://crbug.com/595672/). |
| (function() { |
| var valueB = {}; |
| observationB = internals.observeGC(valueB); |
| })(); |
| |
| await runAsyncGC(); |
| shouldBeTrue('observationB.wasCollected'); |
| // value eligible for GC should be flagged as collected |
| observationB = null; |
| |
| // "One DOM Tree Hill": A family struggles with the loss of |
| // innocence. And a DOM node. |
| |
| // Do initialization work in an inner function to avoid references to |
| // objects remaining live on this function's stack frame. |
| // (http://crbug.com/595672/). |
| (function() { |
| var valueC = document.createElement('div'); |
| observationC = internals.observeGC(valueC); |
| })(); |
| |
| await runAsyncGC(); |
| shouldBeTrue('observationC.wasCollected'); |
| // DOM node eligible for GC should be flagged as collected |
| observationC = null; |
| |
| // Now, movies that failed: |
| |
| shouldThrow('internals.observeGC(undefined)', |
| '"TypeError: value to observe is null or undefined"'); |
| shouldThrow('internals.observeGC(null)', |
| '"TypeError: value to observe is null or undefined"'); |
| |
| // Try to create objects and observers that will die at once |
| |
| // Do initialization work in an inner function to avoid references to |
| // objects remaining live on this function's stack frame. |
| // (http://crbug.com/595672/). |
| (function() { |
| var valueD = {}; |
| var observerD = internals.observeGC(valueD); |
| valueD.observer = observerD; |
| observerD.observed = valueD; |
| })(); |
| |
| await runAsyncGC(); |
| testPassed('did not crash'); |
| |
| finishJSTest(); |
| })(); |
| |
| var successfullyParsed = true; |
| </script> |
