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/* Any copyright is dedicated to the Public Domain.
http://creativecommons.org/publicdomain/zero/1.0/ */
// Sanity test that we can compute shortest paths.
//
// Because the actual heap graph is too unpredictable and likely to drastically
// change as various implementation bits change, we don't test exact paths
// here. See js/src/jsapi-tests/testUbiNode.cpp for such tests, where we can
// control the specific graph shape and structure and so testing exact paths is
// reliable.
function run_test() {
const path = ChromeUtils.saveHeapSnapshot({ runtime: true });
const snapshot = ChromeUtils.readHeapSnapshot(path);
const dominatorTree = snapshot.computeDominatorTree();
const dominatedByRoot = dominatorTree.getImmediatelyDominated(dominatorTree.root)
.slice(0, 10);
ok(dominatedByRoot);
ok(dominatedByRoot.length);
const targetSet = new Set(dominatedByRoot);
const shortestPaths = snapshot.computeShortestPaths(dominatorTree.root, dominatedByRoot, 2);
ok(shortestPaths);
ok(shortestPaths instanceof Map);
ok(shortestPaths.size === targetSet.size);
for (let [target, paths] of shortestPaths) {
ok(targetSet.has(target),
"We should only get paths for our targets");
targetSet.delete(target);
ok(paths.length > 0,
"We must have at least one path, since the target is dominated by the root");
ok(paths.length <= 2,
"Should not have recorded more paths than the max requested");
dumpn("---------------------");
dumpn("Shortest paths for 0x" + target.toString(16) + ":");
for (let path of paths) {
dumpn(" path =");
for (let part of path) {
dumpn(" predecessor: 0x" + part.predecessor.toString(16) +
"; edge: " + part.edge);
}
}
dumpn("---------------------");
for (let path of paths) {
ok(path.length > 0, "Cannot have zero length paths");
ok(path[0].predecessor === dominatorTree.root,
"The first predecessor is always our start node");
for (let part of path) {
ok(part.predecessor, "Each part of a path has a predecessor");
ok(!!snapshot.describeNode({ by: "count", count: true, bytes: true},
part.predecessor),
"The predecessor is in the heap snapshot");
ok("edge" in part, "Each part has an (potentially null) edge property");
}
}
}
ok(targetSet.size === 0,
"We found paths for all of our targets");
do_test_finished();
}
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