Handle DefPath hashing centrally as part of DefPathTable (+ save work during SVH calculation) #41056
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nikomatsakis
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Apr 4, 2017
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The SVH (Strict Version Hash) of a crate is currently computed by hashing the ICHes (Incremental Computation Hashes) of the crate's HIR. This is fine, expect that for incr. comp. we compute two ICH values for each HIR item, one for the complete item and one that just includes the item's interface. The two hashes are are needed for dependency tracking but if we are compiling non-incrementally and just need the ICH values for the SVH, one of them is enough, giving us the opportunity to save some work in this case.
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…shes, r=nikomatsakis Handle DefPath hashing centrally as part of DefPathTable (+ save work during SVH calculation) In almost all cases where we construct a `DefPath`, we just hash it and throw it away again immediately. With this PR, the compiler will immediately compute and store the hash for each `DefPath` as it is allocated. This way we + can get rid of any subsequent `DefPath` hash caching (e.g. the `DefPathHashes`), + don't need to allocate a transient `Vec` for holding the `DefPath` (although I'm always surprised how little these small, dynamic allocations seem to hurt performance), and + we don't hash `DefPath` prefixes over and over again. That last part is because we construct the hash for `prefix::foo` by hashing `(hash(prefix), foo)` instead of hashing every component of prefix. The last commit of this PR is pretty neat, I think: ``` The SVH (Strict Version Hash) of a crate is currently computed by hashing the ICHes (Incremental Computation Hashes) of the crate's HIR. This is fine, expect that for incr. comp. we compute two ICH values for each HIR item, one for the complete item and one that just includes the item's interface. The two hashes are are needed for dependency tracking but if we are compiling non-incrementally and just need the ICH values for the SVH, one of them is enough, giving us the opportunity to save some work in this case. ``` r? @nikomatsakis This PR depends on rust-lang#40878 to be merged first (you can ignore the first commit for reviewing, that's just rust-lang#40878).
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In almost all cases where we construct a
DefPath, we just hash it and throw it away again immediately.With this PR, the compiler will immediately compute and store the hash for each
DefPathas it is allocated. This way weDefPathhash caching (e.g. theDefPathHashes),Vecfor holding theDefPath(although I'm always surprised how little these small, dynamic allocations seem to hurt performance), andDefPathprefixes over and over again.That last part is because we construct the hash for
prefix::fooby hashing(hash(prefix), foo)instead of hashing every component of prefix.The last commit of this PR is pretty neat, I think:
r? @nikomatsakis
This PR depends on #40878 to be merged first (you can ignore the first commit for reviewing, that's just #40878).