зеркало из https://github.com/mozilla/gecko-dev.git
201 строка
8.4 KiB
HTML
201 строка
8.4 KiB
HTML
<!DOCTYPE html>
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<html>
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<!-- https://bugzilla.mozilla.org/show_bug.cgi?id=900784 -->
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<!-- The JS bytecode cache is not supposed to be observable. To make it
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observable, the ScriptLoader is instrumented to trigger events on the
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script tag. These events are followed to reconstruct the code path taken by
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the script loader and associate a simple name which is checked in these
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test cases.
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-->
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<head>
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<meta charset="utf-8">
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<title>Test for saving and loading bytecode in/from the necko cache</title>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script type="application/javascript">
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// This is the state machine of the trace events produced by the
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// ScriptLoader. This state machine is used to give a name to each
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// code path, such that we can assert each code path with a single word.
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var scriptLoaderStateMachine = {
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"scriptloader_load_source": {
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"scriptloader_execute": {
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"scriptloader_encode": {
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"scriptloader_bytecode_saved": "bytecode_saved",
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"scriptloader_bytecode_failed": "bytecode_failed"
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},
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"scriptloader_no_encode": "source_exec"
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}
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},
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"scriptloader_load_bytecode": {
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"scriptloader_fallback": {
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// Replicate the top-level state machine without
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// "scriptloader_load_bytecode" transition.
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"scriptloader_load_source": {
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"scriptloader_execute": {
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"scriptloader_encode": {
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"scriptloader_bytecode_saved": "fallback_bytecode_saved",
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"scriptloader_bytecode_failed": "fallback_bytecode_failed"
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},
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"scriptloader_no_encode": "fallback_source_exec"
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}
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}
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},
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"scriptloader_execute": "bytecode_exec"
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}
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};
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function WaitForScriptTagEvent(url) {
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var iframe = document.createElement("iframe");
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document.body.appendChild(iframe);
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var stateMachine = scriptLoaderStateMachine;
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var stateHistory = [];
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var stateMachineResolve, stateMachineReject;
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var statePromise = new Promise((resolve, reject) => {
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stateMachineResolve = resolve;
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stateMachineReject = reject;
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});
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var ping = 0;
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// Walk the script loader state machine with the emitted events.
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function log_event(evt) {
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// If we have multiple script tags in the loaded source, make sure
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// we only watch a single one.
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if (evt.target.id != "watchme")
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return;
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dump("## ScriptLoader event: " + evt.type + "\n");
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stateHistory.push(evt.type)
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if (typeof stateMachine == "object")
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stateMachine = stateMachine[evt.type];
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if (typeof stateMachine == "string") {
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// We arrived to a final state, report the name of it.
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var result = stateMachine;
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if (ping) {
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result = `${result} & ping(=${ping})`;
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}
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stateMachineResolve(result);
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} else if (stateMachine === undefined) {
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// We followed an unknown transition, report the known history.
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stateMachineReject(stateHistory);
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}
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}
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var iwin = iframe.contentWindow;
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iwin.addEventListener("scriptloader_load_source", log_event);
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iwin.addEventListener("scriptloader_load_bytecode", log_event);
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iwin.addEventListener("scriptloader_generate_bytecode", log_event);
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iwin.addEventListener("scriptloader_execute", log_event);
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iwin.addEventListener("scriptloader_encode", log_event);
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iwin.addEventListener("scriptloader_no_encode", log_event);
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iwin.addEventListener("scriptloader_bytecode_saved", log_event);
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iwin.addEventListener("scriptloader_bytecode_failed", log_event);
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iwin.addEventListener("scriptloader_fallback", log_event);
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iwin.addEventListener("ping", (evt) => {
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ping += 1;
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dump(`## Content event: ${evt.type} (=${ping})\n`);
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});
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iframe.src = url;
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statePromise.then(() => {
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document.body.removeChild(iframe);
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});
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return statePromise;
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}
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promise_test(async function() {
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// Setting dom.expose_test_interfaces pref causes the
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// nsScriptLoadRequest to fire event on script tags, with information
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// about its internal state. The ScriptLoader source send events to
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// trace these and resolve a promise with the path taken by the
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// script loader.
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//
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// Setting dom.script_loader.bytecode_cache.strategy to -1 causes the
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// nsScriptLoadRequest to force all the conditions necessary to make a
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// script be saved as bytecode in the alternate data storage provided
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// by the channel (necko cache).
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await SpecialPowers.pushPrefEnv({set: [
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['dom.script_loader.bytecode_cache.enabled', true],
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['dom.expose_test_interfaces', true],
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['dom.script_loader.bytecode_cache.strategy', -1]
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]});
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// Load the test page, and verify that the code path taken by the
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// nsScriptLoadRequest corresponds to the code path which is loading a
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// source and saving it as bytecode.
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var stateMachineResult = WaitForScriptTagEvent("file_js_cache.html");
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assert_equals(await stateMachineResult, "bytecode_saved",
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"[1] ScriptLoadRequest status after the first visit");
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// Reload the same test page, and verify that the code path taken by
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// the nsScriptLoadRequest corresponds to the code path which is
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// loading bytecode and executing it.
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stateMachineResult = WaitForScriptTagEvent("file_js_cache.html");
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assert_equals(await stateMachineResult, "bytecode_exec",
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"[2] ScriptLoadRequest status after the second visit");
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// Load another page which loads the same script with an SRI, while
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// the cached bytecode does not have any. This should fallback to
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// loading the source before saving the bytecode once more.
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stateMachineResult = WaitForScriptTagEvent("file_js_cache_with_sri.html");
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assert_equals(await stateMachineResult, "fallback_bytecode_saved",
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"[3] ScriptLoadRequest status after the SRI hash");
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// Loading a page, which has the same SRI should verify the SRI and
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// continue by executing the bytecode.
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var stateMachineResult1 = WaitForScriptTagEvent("file_js_cache_with_sri.html");
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// Loading a page which does not have a SRI while we have one in the
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// cache should not change anything. We should also be able to load
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// the cache simultanesouly.
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var stateMachineResult2 = WaitForScriptTagEvent("file_js_cache.html");
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assert_equals(await stateMachineResult1, "bytecode_exec",
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"[4] ScriptLoadRequest status after same SRI hash");
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assert_equals(await stateMachineResult2, "bytecode_exec",
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"[5] ScriptLoadRequest status after visit with no SRI");
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}, "Check the JS bytecode cache");
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promise_test(async function() {
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// (see above)
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await SpecialPowers.pushPrefEnv({set: [
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['dom.script_loader.bytecode_cache.enabled', true],
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['dom.expose_test_interfaces', true],
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['dom.script_loader.bytecode_cache.strategy', -1]
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]});
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// The test page add a new script which generate a "ping" event, which
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// should be recorded before the bytecode is stored in the cache.
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var stateMachineResult =
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WaitForScriptTagEvent("file_js_cache_save_after_load.html");
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assert_equals(await stateMachineResult, "bytecode_saved & ping(=3)",
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"Wait on all scripts to be executed");
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}, "Save bytecode after the initialization of the page");
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promise_test(async function() {
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// (see above)
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await SpecialPowers.pushPrefEnv({set: [
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['dom.script_loader.bytecode_cache.enabled', true],
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['dom.expose_test_interfaces', true],
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['dom.script_loader.bytecode_cache.strategy', -1]
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]});
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// The test page loads a script which contains a syntax error, we should
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// not attempt to encode any bytecode for it.
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var stateMachineResult =
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WaitForScriptTagEvent("file_js_cache_syntax_error.html");
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assert_equals(await stateMachineResult, "source_exec",
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"Check the lack of bytecode encoding");
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}, "Do not save bytecode on compilation errors");
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done();
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</script>
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</head>
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<body>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=900784">Mozilla Bug 900784</a>
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</body>
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</html>
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