)]}'
{
  "commit": "0ca6bf523cb894233d1e5681004fe1060db8f9f0",
  "tree": "099c17b58b478a1cf1f86665ac10b410e1761920",
  "parents": [
    "73a6bcf2eb2708302cb37013f3128b90c6bbe1a6"
  ],
  "author": {
    "name": "Joshua Haberman",
    "email": "haberman@google.com",
    "time": "Wed Oct 21 15:25:22 2026 -0700"
  },
  "committer": {
    "name": "Copybara-Service",
    "email": "copybara-worker@google.com",
    "time": "Mon Nov 09 00:58:54 2026 -0800"
  },
  "message": "Guard and privatize CMessage child-wrapper caches with ChildWrapperMap.\n\n`CMessage::composite_fields` and `CMessage::child_submessages` were\nstill raw `LazyUniquePtr\u003cPyWeakValueMap\u003e` members, and `GetFieldValue`\nand extension `subscript` registered lazily created wrappers after\nreleasing the parent\u0027s read lock, allowing a concurrent `Clear` or\n`ClearField` detach to miss a newly created wrapper and leave it on the\nold `MessageTree`.\n\nIntroduce `ChildWrapperMap` in `child_wrapper_map.h` to document and\nenforce the locking and lifetime invariants of `CMessage`\u0027s weak\nchild-wrapper caches against the tree `AccessGuard`, including\nsanitizer guard tracking and `DCheckChildWrapper` consistency checks on\nwrite-locked walks. Make `composite_fields` and `child_submessages`\nprivate on `CMessage`, and look up message classes before acquiring\n`WithRead` so wrapper creation and `SetCompositeField` registration\nhappen within a single read lock.\n\nPiperOrigin-RevId: 1004276266\n",
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