mirror of
https://github.com/LadybirdBrowser/ladybird
synced 2026-05-13 18:36:38 +02:00
7f89158d20
Replace the saved_lexical_environments stack in ExecutionContextRareData with explicit register-based environment tracking. Environments are now stored in registers and restored via SetLexicalEnvironment, making the environment flow visible in bytecode. Key changes: - Add GetLexicalEnvironment and SetLexicalEnvironment opcodes - CreateLexicalEnvironment takes explicit parent and dst operands - EnterObjectEnvironment stores new environment in a dst register - NewClass takes an explicit class_environment operand - Remove LeaveLexicalEnvironment opcode (instead: SetLexicalEnvironment) - Remove saved_lexical_environments from ExecutionContextRareData - Use a reserved register for the saved lexical environment to avoid dominance issues with lazily-emitted GetLexicalEnvironment
16 lines
718 B
Plaintext
16 lines
718 B
Plaintext
JS bytecode executable ""
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[ 0] 0: GetLexicalEnvironment dst:reg4
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[ 8] GetGlobal dst:reg6, identifier:outer
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[ 18] Call dst:reg5, callee:reg6, this_value:Undefined, outer
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[ 38] End value:reg5
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JS bytecode executable "outer"
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[ 0] 0: GetLexicalEnvironment dst:reg4
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[ 8] CreateVariable identifier:inner, is_immutable:false, is_global:false, is_strict:false
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[ 18] InitializeVariableBinding identifier:inner, src:Undefined
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[ 30] NewFunction dst:reg5
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[ 48] SetVariableBinding identifier:inner, src:reg5
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[ 60] GetGlobal dst:reg6, identifier:Number
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[ 70] CallConstruct dst:reg5, callee:reg6, Number, arguments:[Int32(42)]
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[ 90] Return value:reg5
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