• Seth Brenith's avatar
    [torque] Add LazyNode support · ede27407
    Seth Brenith authored
    This change adds a new abstract type Lazy<T> which can be used to
    interoperate with CSA code that uses LazyNode. This new type has special
    code-generation rules because its generated type is not TNode<...> but
    std::function<TNode<...>()>. Torque code can do nothing with this type
    except pass it around, but passing it to the CSA function RunLazy is an
    easy way to execute the std::function and get back a normal value.
    Torque code can also create Lazy<T> values using the intrinsic function
    %MakeLazy, which takes the name of a macro as its first parameter,
    followed by arguments to that macro which will be passed when the
    LazyNode is evaluated. We use the macro's name because the language
    doesn't support taking references to macros, and implementing such a
    feature would be complicated.
    
    Bug: v8:7793
    Change-Id: I09120960e3492dd51be0d4c57e14ff3826b99262
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2701752
    Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
    Reviewed-by: 's avatarNico Hartmann <nicohartmann@chromium.org>
    Reviewed-by: 's avatarLeszek Swirski <leszeks@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#72964}
    ede27407
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