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Diffstat (limited to 'dom/base/test/test_delazification_strategy.html')
| -rw-r--r-- | dom/base/test/test_delazification_strategy.html | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/dom/base/test/test_delazification_strategy.html b/dom/base/test/test_delazification_strategy.html new file mode 100644 index 0000000000..427fd7cecd --- /dev/null +++ b/dom/base/test/test_delazification_strategy.html @@ -0,0 +1,174 @@ +<!DOCTYPE html> +<html> +<!-- https://bugzilla.mozilla.org/show_bug.cgi?id=1753709 --> +<!-- Script delazification strategy is not supposed to have any observable + side-effect. To make it observable, the ScriptLoader is instrumented to + trigger events on the script tag. These events are used to validate that + the strategy is used as execpected. This does not garantee that all + functions are delazified properly, but this should be checked in the JS + engine test suite. +--> +<head> + <meta charset="utf-8"> + <title>Test for triggering eager delazification.</title> + <script src="/resources/testharness.js"></script> + <script src="/resources/testharnessreport.js"></script> + <script type="application/javascript"> + async function WaitForScriptTagEvent() { + var url = "file_delazification_strategy.html"; + var iframe = document.createElement("iframe"); + + // Call the resolve function when the event is one of the expected events. + // This is made to be used by a promise and provided to event listeners. + function resolve_with_event(resolve, evt) { + // If we have multiple script tags in the loaded source, make sure + // we only watch a single one. + if (evt.target.id != "watchme") + return; + + switch (evt.type) { + case "delazification_on_demand_only": + case "delazification_concurrent_depth_first": + case "delazification_parse_everything_eagerly": + resolve(evt.type.split('_').slice(1).join('_')); + break; + case "scriptloader_main_thread_compile": + resolve(evt.type); + break; + } + } + + // Create an event listener, which resolves a promise. + let log_event; + let scriptLoaderTrace = new Promise((resolve, reject) => { + log_event = resolve_with_event.bind(this, resolve); + }); + + // Wait until the iframe is fully loaded. + await new Promise(resolve => { + iframe.onload = resolve; + iframe.src = url; + document.body.appendChild(iframe); + }); + + // Register all events. + let events = [ + "delazification_on_demand_only", + "delazification_concurrent_depth_first", + "delazification_parse_everything_eagerly", + "scriptloader_main_thread_compile" + ]; + let iwin = iframe.contentWindow; + for (let evt of events) { + iwin.addEventListener(evt, log_event); + } + + // Add a script tag, which will trigger one of the previous events. + let script = document.createElement("script"); + script.setAttribute("id", "watchme"); + script.setAttribute("src", "file_delazification_strategy.js"); + iframe.contentDocument.body.appendChild(script); + + // Wait for the event emitted by ScriptLoader, while processing the + // previous script. + let result = await scriptLoaderTrace; + + // Remove the events and the iframe. + for (let evt of events) { + iwin.removeEventListener(evt, log_event); + } + document.body.removeChild(iframe); + return result; + } + + // Setting dom.expose_test_interfaces pref causes the + // nsScriptLoadRequest to fire event on script tags, with information + // about its internal state. The ScriptLoader source send events to + // trace these and resolve a promise with the path taken by the + // script loader. + // + // Setting dom.script_loader.bytecode_cache.enabled to false in order + // to prevent the bytecode cache to perturb this test case. + // + // Setting dom.script_loader.external_scripts.speculate_* are used to + // force off-main-thread compilation, while hoping that we have enough + // processors to run the test case + // + // Setting dom.delazification.* are used to select the delazification + // strategy and to check that it is well selected. + promise_test(async function() { + await SpecialPowers.pushPrefEnv({set: [ + ['dom.expose_test_interfaces', true], + ['dom.script_loader.bytecode_cache.enabled', false], + ['dom.script_loader.external_scripts.speculate_non_parser_inserted.enable', true], + ['dom.script_loader.external_scripts.speculate_async.enabled', true], + ['dom.script_loader.external_scripts.speculate_link_preload.enabled', true], + // Parse everything eagerly + ['dom.script_loader.delazification.strategy', 255], + ['dom.script_loader.delazification.max_size', 0], + ['dom.script_loader.delazification.min_mem', 0], + ]}); + + assert_equals(await WaitForScriptTagEvent(), "on_demand_only", + "[1] AttemptAsyncScriptCompile: On demand only"); + }, "Check that max_size can disable delazification strategy"); + + promise_test(async function() { + await SpecialPowers.pushPrefEnv({set: [ + ['dom.expose_test_interfaces', true], + ['dom.script_loader.bytecode_cache.enabled', false], + // Enable OffMainThread compilation for everything, and cross-fingers + // about the number of CPU. + ['dom.script_loader.external_scripts.speculate_non_parser_inserted.enable', true], + ['dom.script_loader.external_scripts.speculate_async.enabled', true], + ['dom.script_loader.external_scripts.speculate_link_preload.enabled', true], + // Parse everything eagerly + ['dom.script_loader.delazification.strategy', 255], + ['dom.script_loader.delazification.max_size', 10485760], + // 4 TB should of RAM be enough. + ['dom.script_loader.delazification.min_mem', 4096], + ]}); + + assert_equals(await WaitForScriptTagEvent(), "on_demand_only", + "[2] AttemptAsyncScriptCompile: On demand only"); + }, "Check that min_mem can disable delazification strategy"); + + promise_test(async function() { + await SpecialPowers.pushPrefEnv({set: [ + ['dom.expose_test_interfaces', true], + ['dom.script_loader.bytecode_cache.enabled', false], + // Enable OffMainThread compilation for everything, and cross-fingers + // about the number of CPU. + ['dom.script_loader.external_scripts.speculate_non_parser_inserted.enable', true], + ['dom.script_loader.external_scripts.speculate_async.enabled', true], + ['dom.script_loader.external_scripts.speculate_link_preload.enabled', true], + ['dom.script_loader.delazification.max_size', 10485760], + ['dom.script_loader.delazification.min_mem', 0], + ]}); + + await SpecialPowers.pushPrefEnv({set: [ + ['dom.script_loader.delazification.strategy', 0], + ]}); + assert_equals(await WaitForScriptTagEvent(), "on_demand_only", + "[3] AttemptAsyncScriptCompile: On demand only"); + + await SpecialPowers.pushPrefEnv({set: [ + ['dom.script_loader.delazification.strategy', 2], + ]}); + assert_equals(await WaitForScriptTagEvent(), "concurrent_depth_first", + "[3] AttemptAsyncScriptCompile: Concurrent Depth First"); + + await SpecialPowers.pushPrefEnv({set: [ + ['dom.script_loader.delazification.strategy', 255], + ]}); + assert_equals(await WaitForScriptTagEvent(), "parse_everything_eagerly", + "[3] AttemptAsyncScriptCompile: Parse Everything Eagerly"); + }, "Check enabling delazification strategy works"); + + done(); + </script> +</head> +<body> + <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1753709">Mozilla Bug 1753709</a> +</body> +</html> |