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LibJS: Add alternative source-to-bytecode pipeline in Rust

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Implement a complete Rust reimplementation of the LibJS frontend:
lexer, parser, AST, scope collector, and bytecode code generator.

The Rust pipeline is built via Corrosion (CMake-Cargo bridge) and
linked into LibJS as a static library. It is gated behind a build
flag (ENABLE_RUST, on by default except on Windows) and two runtime
environment variables:

- LIBJS_CPP: Use the C++ pipeline instead of Rust
- LIBJS_COMPARE_PIPELINES=1: Run both pipelines in lockstep,
  aborting on any difference in AST or bytecode generated.

The C++ side communicates with Rust through a C FFI layer
(RustIntegration.cpp/h) that passes source text to Rust and receives
a populated Executable back via a BytecodeFactory interface.
This commit is contained in:
Andreas Kling
2026-02-23 11:50:46 +01:00
committed by Andreas Kling
parent 8bf1d749a1
commit 6cdfbd01a6
Notes: github-actions[bot] 2026-02-24 08:41:00 +00:00 
Author: https://github.com/awesomekling
Commit: https://github.com/LadybirdBrowser/ladybird/commit/6cdfbd01a6b
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/8104
43 changed files with 28402 additions and 148 deletions
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6
Tests/LibJS/Bytecode/expected/parameter-createvariable-order.txt
View File

@@ -6,9 +6,9 @@ JS bytecode executable ""
JS bytecode executable "f"
[ 0] 0: GetLexicalEnvironment dst:reg4
[ 8] CreateVariable identifier:c, is_immutable:false, is_global:false, is_strict:false
[ 18] CreateVariable identifier:a, is_immutable:false, is_global:false, is_strict:false
[ 28] CreateVariable identifier:b, is_immutable:false, is_global:false, is_strict:false
[ 8] CreateVariable identifier:a, is_immutable:false, is_global:false, is_strict:false
[ 18] CreateVariable identifier:b, is_immutable:false, is_global:false, is_strict:false
[ 28] CreateVariable identifier:c, is_immutable:false, is_global:false, is_strict:false
[ 38] InitializeLexicalBinding identifier:a, src:arg0
[ 50] InitializeLexicalBinding identifier:b, src:arg1
[ 68] InitializeLexicalBinding identifier:c, src:arg2