• Patrick Thier's avatar
    [string] Make String internalization threadsafe for shared strings · cc3c93f1
    Patrick Thier authored
    This CL fixes 2 issues with string internalization when the string table
    is shared:
    1. In-place migration of a string's map to Internalized was done before
       it was sure that the string is going to be internalized (outside the
       critical section). To fix this problem StringTableKey::AsHandle() is
       now split into StringTableKey::PrepareForInsertion(), which is
       invoked outside the critical section and creates a copy if
       necessary, and StringTableKey::GetHandleForInsertion(), which is
       invoked inside the critical section only for string table misses.
       Migration of the map is handled by this method.
    2. TryStringToIndexOrLookupExisting() didn't handle already internalized
       strings. So far this was impossible, as this method was only invoked
       for strings that were checked not to be internalized. However with
       a shared string table, the string could be internalized after the
       checks.
    
    Bug: v8:12007
    Change-Id: I193d6b54dc41360eee47d21cbcaa36d2652d85dd
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3368103Reviewed-by: 's avatarShu-yu Guo <syg@chromium.org>
    Reviewed-by: 's avatarLeszek Swirski <leszeks@chromium.org>
    Commit-Queue: Patrick Thier <pthier@chromium.org>
    Cr-Commit-Position: refs/heads/main@{#78600}
    cc3c93f1
test-shared-strings.cc 25.5 KB