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internal/pkg/ir: document reason for avoiding ident cache

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This got brought up earlier today as a potential optimisation. This change documents why it is not viable, and hopefully clears up some performance implications of using IRDecoder, namely that its decoding costs do not amortise.

Signed-off-by: Ophestra <cat@gensokyo.uk>
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Ophestra
2026-02-17 14:38:42 +09:00
parent 88d9a6163e
commit a40527dcb2
1 changed files with 7 additions and 0 deletions
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7
internal/pkg/ir.go
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@@ -310,6 +310,13 @@ type (
// verbose logging is enabled. Artifacts may only depend on artifacts
// previously described in the IR stream.
//
// IRDecoder rejects an IR stream on the first decoding error, it does not
// check against nonzero reserved ancillary data or incorrectly ordered or
// redundant unstructured dependencies. An invalid IR stream as such will
// yield [Artifact] values with identifiers disagreeing with those computed
// by IRDecoder. For this reason, IRDecoder does not access the ident cache
// to avoid putting [Cache] into an inconsistent state.
//
// Methods of IRDecoder are not safe for concurrent use.
IRDecoder struct {
// Address of underlying [Cache], must not be exposed directly.