ladybird/Tests/LibJS/Bytecode/input/for-loop-scoping.js at 4178ec0af4f357d154bccbd927e2c6621d3b06a0 - ladybird - lab48

eliott/ladybird

mirror of https://github.com/LadybirdBrowser/ladybird synced 2026-04-26 01:35:08 +02:00

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Andreas Kling 7f89158d20 LibJS: Replace implicit environment stack with explicit registers

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

2026-02-09 16:35:39 +01:00

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JavaScript

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 function forLetClosure() {
     let fns = [];
     for (let i = 0; i < 3; i++) {
         fns.push(() => i);
     }
     return fns.map(f => f());
 }
 console.log(forLetClosure());