Make sure the initializer of hoisted variables is deoptimized#4149
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lukastaegert merged 3 commits intomasterfrom Jun 25, 2021
Merged
Make sure the initializer of hoisted variables is deoptimized#4149lukastaegert merged 3 commits intomasterfrom
lukastaegert merged 3 commits intomasterfrom
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@@ Coverage Diff @@
## master #4149 +/- ##
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Coverage 98.28% 98.28%
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Files 201 201
Lines 7116 7118 +2
Branches 2084 2084
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+ Hits 6994 6996 +2
Misses 58 58
Partials 64 64
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lukastaegert
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Jul 7, 2021
* Fix var/const/let variable use before declaration * Also retains TDZ violations present in input * Enabled by default when treeshake is active * Low overhead - uses existing treeshaking simulated execution to mark declarations as reached * successfully run tests from #4149 without treeshake.correctVarBeforeDeclaration * Fix pattern handling * Handle TDZ class access * Improve field name * Fix TDZ caching * Only include entry point exports after first treeshaking pass * No longer make TDZ var access a side effect but treat as unknown value * Remove special logic for TDZ var assignments * Improve self-reference in declaration handling * Deprecate treeshake.correctVarValueBeforeDeclaration * Make deprecation non-active until next major version * Undeprecate correctVarValueBeforeDeclaration * Fix deoptimization regression for call expressions * Improve coverage Co-authored-by: Lukas Taegert-Atkinson <lukas.taegert-atkinson@tngtech.com>
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This PR contains:
Are tests included?
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List any relevant issue numbers:
Resolves #4147
Description
There was already a logic to deoptimize
varvariables that are defined in nested scopes. This logic deoptimized the value of such variables but forgot to also deoptimize the initializer of those variables. It also deoptimizes initializers when vars are deoptimized viatreeshake.correctVarValueBeforeDeclaration.While this is a bug fix, it may prove interesting to see if #4148 will offer a way to handle these things differently. This should not prevent release, however.