ladybird/Tests/LibJS/Bytecode/input/annex-b-function-in-if.js at e4800b2498a2a4e808b21761a7b9916cd27f6fbc - 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 annexBFunctionInIf(x) {
     if (x) {
         function inner() {
             return "true branch";
         }
     } else {
         function inner() {
             return "false branch";
         }
     }
     return inner();
 }
 console.log(annexBFunctionInIf(true));
 console.log(annexBFunctionInIf(false));