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authorAdam Joseph <adam@westernsemico.com>2022-11-23T08·34-0800
committerclbot <clbot@tvl.fyi>2022-11-23T13·02+0000
commita740653c83436e3adc14343efa82422eb0a44933 (patch)
tree685fd9550b9ac0caf5330f95a801b93de92a3d96 /tvix/eval/src/chunk.rs
parentc537cc6fcee5f5cde4b0e6f8c5d6dcd5d8e3690f (diff)
feat(tvix/eval): make NixList::clone() cheap r/5301
When we start unrecursivifying (sp?) things, Rust's borrow checker
is going to be a headache; its magic only works when you use the CPU
stack as your call stack.

Fixing the borrow checker issues usually involves adding lots of
`clone()`s.  Right now `NixList` is the only variant of `Value` that
isn't cheap to clone() -- all the others are either a wrapper around
Rc or else are of bounded size.

Note that this requires dropping the `DerefMut for NixList` instance
and using `Vec<Value>` instead in those situations.

Change-Id: I5a47df66855342aa2064f8f3cb7934ff422d26bd
Signed-off-by: Adam Joseph <adam@westernsemico.com>
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7359
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Diffstat (limited to 'tvix/eval/src/chunk.rs')
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