mirror of
https://github.com/LadybirdBrowser/ladybird
synced 2026-05-02 20:42:11 +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
20 lines
861 B
Plaintext
20 lines
861 B
Plaintext
JS bytecode executable ""
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[ 0] 0: GetLexicalEnvironment dst:reg4
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[ 8] GetGlobal dst:reg6, identifier:foo
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[ 18] Call dst:reg5, callee:reg6, this_value:Undefined, foo
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[ 38] End value:reg5
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JS bytecode executable "foo"
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[ 0] 0: GetLexicalEnvironment dst:reg4
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[ 8] CreateArguments is_immutable:false
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[ 18] GetCalleeAndThisFromEnvironment callee:reg6, this_value:reg7, identifier:eval
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[ 30] CallDirectEval dst:reg5, callee:reg6, this_value:reg7, eval, arguments:[String("var x = 1")]
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[ 58] GetBinding 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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JS bytecode executable "eval"
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[ 0] 0: GetLexicalEnvironment dst:reg4
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[ 8] SetLexicalBinding identifier:x, src:Int32(1)
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[ 20] End value:Undefined
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