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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /devtools/shared/heapsnapshot/tests/xpcshell/test_DominatorTree_06.js | |
parent | Initial commit. (diff) | |
download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'devtools/shared/heapsnapshot/tests/xpcshell/test_DominatorTree_06.js')
-rw-r--r-- | devtools/shared/heapsnapshot/tests/xpcshell/test_DominatorTree_06.js | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/devtools/shared/heapsnapshot/tests/xpcshell/test_DominatorTree_06.js b/devtools/shared/heapsnapshot/tests/xpcshell/test_DominatorTree_06.js new file mode 100644 index 0000000000..fdd4191c5f --- /dev/null +++ b/devtools/shared/heapsnapshot/tests/xpcshell/test_DominatorTree_06.js @@ -0,0 +1,62 @@ +/* Any copyright is dedicated to the Public Domain. + http://creativecommons.org/publicdomain/zero/1.0/ */ +"use strict"; + +// Test that the retained size of a node is the sum of its children retained +// sizes plus its shallow size. + +// Note that we don't assert directly, only if we get an unexpected +// value. There are just way too many nodes in the heap graph to assert for +// every one. This test would constantly time out and assertion messages would +// overflow the log size. +function fastAssert(cond, msg) { + if (!cond) { + ok(false, msg); + } +} + +const COUNT = { by: "count", count: false, bytes: true }; + +function run_test() { + const path = saveNewHeapSnapshot(); + const snapshot = ChromeUtils.readHeapSnapshot(path); + const dominatorTree = snapshot.computeDominatorTree(); + + // Do a traversal of the dominator tree and assert the relationship between + // retained size, shallow size, and children's retained sizes. + + const root = dominatorTree.root; + const stack = [root]; + while (stack.length) { + const top = stack.pop(); + + const children = dominatorTree.getImmediatelyDominated(top); + + const topRetainedSize = dominatorTree.getRetainedSize(top); + const topShallowSize = snapshot.describeNode(COUNT, top).bytes; + fastAssert( + topShallowSize <= topRetainedSize, + "The shallow size should be less than or equal to the " + "retained size" + ); + + let sumOfChildrensRetainedSizes = 0; + for (let i = 0; i < children.length; i++) { + sumOfChildrensRetainedSizes += dominatorTree.getRetainedSize(children[i]); + stack.push(children[i]); + } + + fastAssert( + sumOfChildrensRetainedSizes <= topRetainedSize, + "The sum of the children's retained sizes should be less than " + + "or equal to the retained size" + ); + fastAssert( + sumOfChildrensRetainedSizes + topShallowSize === topRetainedSize, + "The sum of the children's retained sizes plus the shallow " + + "size should be equal to the retained size" + ); + } + + ok(true, "Successfully walked the tree"); + do_test_finished(); +} |