• Leszek Swirski's avatar
    [maglev] Start implenting inlining · c0a63243
    Leszek Swirski authored
    Add a --maglev-inlining flag, and add some half-baked support for
    inlining functions when there is call feedback.
    
    When the flag is enabled and there is call feedback, we create a nested
    MaglevGraphBuilder for the current graph, and pause building the graph
    of the outer function. We manually set up its prologue to set up its
    frame with the arguments pass into the call, build the body with the
    nested graph builder. This inner builder knows that it is building an
    inlined function, and all Return bytecodes will instead emit a Jump to a
    single merge block at the end of the function, where execution of the
    outer function can resume.
    
    These inner function basic blocks are wired into the outer graph with
    new JumpToInline and JumpFromInline control nodes. The idea is that
    subsequent passes will know what the inline function is, and will use
    these to manage the function stack (particularly for codegen and
    especially deopts).
    
    Bug: v8:7700
    Change-Id: I4e9b153f8cf4d06c56e7be6365e7a18b86a773c0
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3585958
    Commit-Queue: Leszek Swirski <leszeks@chromium.org>
    Reviewed-by: 's avatarJakob Linke <jgruber@chromium.org>
    Cr-Commit-Position: refs/heads/main@{#80077}
    c0a63243
maglev-graph-printer.cc 17.2 KB