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/* Any copyright is dedicated to the Public Domain.
http://creativecommons.org/publicdomain/zero/1.0/ */
/**
* Tests if the retrieved profiler data samples always have a (root) node.
* If this ever changes, the |ThreadNode.prototype.insert| function in
* devtools/client/performance/modules/logic/tree-model.js will have to be changed.
*/
"use strict";
// Time in ms
const WAIT_TIME = 1000;
add_task(async function() {
const target = await addTabTarget(MAIN_DOMAIN + "doc_perf.html");
const front = await target.getFront("performance");
const rec = await front.startRecording();
// allow the profiler module to sample some cpu activity
busyWait(WAIT_TIME);
await front.stopRecording(rec);
const profile = rec.getProfile();
let sampleCount = 0;
for (const thread of profile.threads) {
info("Checking thread: " + thread.name);
for (const sample of thread.samples.data) {
sampleCount++;
const stack = getInflatedStackLocations(thread, sample);
if (stack[0] != "(root)") {
ok(
false,
"The sample " + stack.toSource() + " doesn't have a root node."
);
}
}
}
ok(
sampleCount > 0,
"At least some samples have been iterated over, checking for root nodes."
);
await target.getFront("performance");
gBrowser.removeCurrentTab();
});
/**
* Inflate a particular sample's stack and return an array of strings.
*/
function getInflatedStackLocations(thread, sample) {
const stackTable = thread.stackTable;
const frameTable = thread.frameTable;
const stringTable = thread.stringTable;
const SAMPLE_STACK_SLOT = thread.samples.schema.stack;
const STACK_PREFIX_SLOT = stackTable.schema.prefix;
const STACK_FRAME_SLOT = stackTable.schema.frame;
const FRAME_LOCATION_SLOT = frameTable.schema.location;
// Build the stack from the raw data and accumulate the locations in
// an array.
let stackIndex = sample[SAMPLE_STACK_SLOT];
const locations = [];
while (stackIndex !== null) {
const stackEntry = stackTable.data[stackIndex];
const frame = frameTable.data[stackEntry[STACK_FRAME_SLOT]];
locations.push(stringTable[frame[FRAME_LOCATION_SLOT]]);
stackIndex = stackEntry[STACK_PREFIX_SLOT];
}
// The profiler tree is inverted, so reverse the array.
return locations.reverse();
}
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