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vm: include vm context in the embedded snapshot #44252

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vm: include vm context in the embedded snapshot #44252

wants to merge 4 commits into from

Commits on Aug 19, 2022

  1. vm: make ContextifyContext template context-independent 

    Instead of creating an object template for every ContextifyContext,
we now create one object template that can be reused by all
contexts. The native pointer can be obtained through an embdder
pointer field in the creation context of the receiver in the
interceptors, because the interceptors are only meant to be invoked
on the global object of the contextified contexts. This makes
the ContextifyContext template context-independent and therefore
snapshotable.
    @joyeecheung
    joyeecheung committed Aug 19, 2022
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  2. vm: include vm context in the embedded snapshot 

    Include a minimally initialized contextify context in the embedded
snapshot. This paves the way for user-land vm context snapshots.
    @joyeecheung
    joyeecheung committed Aug 19, 2022
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  3. vm: avoid unnecessary property getter interceptor calls 

    Access to the global object from within a vm context is intercepted
so it's slow, therefore we should try to avoid unnecessary access
to it during the initialization of vm contexts.

- Remove the Atomics.wake deletion as V8 now does not install it
  anymore.
- Move the Intl.v8BreakIterator deletion into the snapshot.
- Do not query the Object prototype if --disable-proto is not set.

This should speed up the creation of vm contexts by about ~12%.
    @joyeecheung
    joyeecheung committed Aug 19, 2022
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  4. fixup! vm: make ContextifyContext template context-independent

    @joyeecheung
    joyeecheung committed Aug 19, 2022
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