Deduplicate function signatures in wasm modules#2772
Merged
alexcrichton merged 1 commit intoMar 25, 2021
Conversation
Currently wasmtime will generate a `SignatureIndex`-per-type in the module itself, even if the module itself declares the same type multiple times. To make matters worse if the same type is declared across multiple modules used in a module-linking-using-module then the signature will be recorded each time it's declared. This commit adds a simple map to module translation to deduplicate these function types. This should improve the performance of module-linking graphs where the same function type may be declared in a number of modules. For modules that don't use module linking this adds an extra map that's not used too often, but the time spent managing it should be dwarfed by other compile tasks.
peterhuene
approved these changes
Mar 25, 2021
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Currently wasmtime will generate a
SignatureIndex-per-type in themodule itself, even if the module itself declares the same type multiple
times. To make matters worse if the same type is declared across
multiple modules used in a module-linking-using-module then the
signature will be recorded each time it's declared.
This commit adds a simple map to module translation to deduplicate these
function types. This should improve the performance of module-linking
graphs where the same function type may be declared in a number of
modules. For modules that don't use module linking this adds an extra
map that's not used too often, but the time spent managing it should be
dwarfed by other compile tasks.