• Benedikt Meurer's avatar
    [stack-traces] Don't hold on to code objects from StackFrameInfos. · 6b1fb003
    Benedikt Meurer authored
    Previously every `StackFrameInfo` instance would maintain a reference to
    an AbstractCode object, which was used to resolve the `code_offset` on
    that stack frame. However, it turns out that nowadays this is not
    necessary anymore, since all `code_offset`s reported for JavaScript
    frames are already bytecode offsets and thus can be resolved by just
    looking at the functions' bytecode.
    
    For WebAssembly frames we will also eagerly resolve the `code_offset`
    (which is different depending on whether we're looking at Liftoff or
    TurboFan code) to the byte offset (relative to the function start) and
    stash that away in the `StackFrameInfo`.
    
    For builtin exit frames, the `abstract_code` on the function always
    refers to the builtin code object and thus, there's no point in keeping
    an extra pointer to it around on the `StackFrameInfo`.
    
    This way the `StackFrameInfo` representation is somewhat uniform, and
    more importantly, the `StackFrameInfo` instances will no longer need to
    hold to concrete code objects.
    
    Drive-by-fix: Use `FixedArray::SetAndGrow()` when adding to the elements
    in the `StackTraceBuilder`.
    
    Also-By: szuend@chromium.org, jarin@chromium.org
    Bug: chromium:1258599, chromium:1077657, v8:8742, chromium:1069425
    Change-Id: I650e400e0e1acd920281669bdc7b5e1199683ae8
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3323073Reviewed-by: 's avatarJakob Kummerow <jkummerow@chromium.org>
    Reviewed-by: 's avatarLeszek Swirski <leszeks@chromium.org>
    Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
    Cr-Commit-Position: refs/heads/main@{#78320}
    6b1fb003
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