ladybird/Tests/LibJS/Bytecode/input/class-environment.js at e4800b2498a2a4e808b21761a7b9916cd27f6fbc - ladybird - lab48

eliott/ladybird

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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 classWithName() {
     let C = class Foo {
         method() {
             return Foo;
         }
     };
     return new C().method() === C;
 }
 console.log(classWithName());