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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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5
Libraries/LibJS/Runtime/AbstractOperations.h
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@@ -97,7 +97,7 @@ struct EvalDeclarationData {
Vector<Utf16FlyString> var_names;
struct FunctionToInitialize {
GC::Ref<SharedFunctionInstanceData> shared_data;
GC::Root<SharedFunctionInstanceData> shared_data;
Utf16FlyString name;
};
Vector<FunctionToInitialize> functions_to_initialize;
@@ -105,7 +105,8 @@ struct EvalDeclarationData {
Vector<Utf16FlyString> var_scoped_names;
Vector<NonnullRefPtr<FunctionDeclaration>> annex_b_candidates;
Vector<Utf16FlyString> annex_b_candidate_names;
Vector<NonnullRefPtr<FunctionDeclaration>> annex_b_function_declarations;
struct LexicalBinding {
Utf16FlyString name;