mirror of
https://github.com/LadybirdBrowser/ladybird
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cd2576c031
When emitting block declaration instantiation, we were not calling set_local_initialized() after writing block-scoped function declarations to local variables via Mov. This caused unnecessary ThrowIfTDZ checks to be emitted when those locals were later read. Block-scoped function declarations are always initialized at block entry (via NewFunction + Mov), so TDZ checks for them are redundant.
22 lines
849 B
Plaintext
22 lines
849 B
Plaintext
JS bytecode executable ""
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[ 0] 0: GetLexicalEnvironment dst:reg4
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[ 8] GetGlobal dst:reg6, identifier:test
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[ 18] Call dst:reg5, callee:reg6, this_value:Undefined, test
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[ 38] End value:reg5
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JS bytecode executable "test"
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[ 0] 0: GetLexicalEnvironment dst:reg4
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[ 8] Mov dst:result~1, src:Undefined
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[ 18] CreateLexicalEnvironment dst:reg5, parent:reg4, capacity:0
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[ 28] NewFunction dst:reg6, shared_function_data_index:0
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[ 40] Mov dst:foo~0, src:reg6
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[ 50] Mov dst:reg7, src:foo~0
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[ 60] Call dst:reg6, callee:reg7, this_value:Undefined, foo
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[ 80] Mov dst:result~1, src:reg6
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[ 90] SetLexicalEnvironment environment:reg4
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[ 98] Return value:result~1
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JS bytecode executable "foo"
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[ 0] 0: GetLexicalEnvironment dst:reg4
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[ 8] Return value:Int32(42)
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