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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
43 changed files with 28402 additions and 148 deletions
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11
Libraries/LibJS/Runtime/NativeJavaScriptBackedFunction.cpp
View file

@ -12,6 +12,7 @@
#include <LibJS/Runtime/AsyncGenerator.h>
#include <LibJS/Runtime/GeneratorObject.h>
#include <LibJS/Runtime/NativeJavaScriptBackedFunction.h>
#include <LibJS/RustIntegration.h>
namespace JS {
@ -98,7 +99,15 @@ Bytecode::Executable& NativeJavaScriptBackedFunction::bytecode_executable()
{
auto& executable = m_shared_function_instance_data->m_executable;
if (!executable) {
executable = Bytecode::compile(vm(), m_shared_function_instance_data, Bytecode::BuiltinAbstractOperationsEnabled::Yes);
auto rust_executable = RustIntegration::compile_function(vm(), *m_shared_function_instance_data, true);
if (rust_executable) {
executable = rust_executable;
executable->name = m_shared_function_instance_data->m_name;
if (Bytecode::g_dump_bytecode)
executable->dump();
} else {
executable = Bytecode::compile(vm(), m_shared_function_instance_data, Bytecode::BuiltinAbstractOperationsEnabled::Yes);
}
m_shared_function_instance_data->clear_compile_inputs();
}