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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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38
Libraries/LibJS/SourceTextModule.h
View File

@@ -32,23 +32,6 @@ public:
Object* import_meta() { return m_import_meta; }
void set_import_meta(Badge<VM>, Object* import_meta) { m_import_meta = import_meta; }
protected:
virtual ThrowCompletionOr<void> initialize_environment(VM& vm) override;
virtual ThrowCompletionOr<void> execute_module(VM& vm, GC::Ptr<PromiseCapability> capability) override;
private:
SourceTextModule(Realm&, StringView filename, Script::HostDefined* host_defined, bool has_top_level_await, NonnullRefPtr<Program> body, Vector<ModuleRequest> requested_modules, Vector<ImportEntry> import_entries, Vector<ExportEntry> local_export_entries, Vector<ExportEntry> indirect_export_entries, Vector<ExportEntry> star_export_entries, Optional<Utf16FlyString> default_export_binding_name);
virtual void visit_edges(Cell::Visitor&) override;
RefPtr<Program> m_ecmascript_code; // [[ECMAScriptCode]]
NonnullOwnPtr<ExecutionContext> m_execution_context; // [[Context]]
GC::Ptr<Object> m_import_meta; // [[ImportMeta]]
Vector<ImportEntry> m_import_entries; // [[ImportEntries]]
Vector<ExportEntry> m_local_export_entries; // [[LocalExportEntries]]
Vector<ExportEntry> m_indirect_export_entries; // [[IndirectExportEntries]]
Vector<ExportEntry> m_star_export_entries; // [[StarExportEntries]]
// Pre-computed module declaration instantiation data.
// These are extracted from the AST at construction time so that
// initialize_environment() can run without walking the AST.
@@ -61,6 +44,27 @@ private:
bool is_constant { false };
i32 function_index { -1 }; // index into m_functions_to_initialize, -1 if not a function
};
protected:
virtual ThrowCompletionOr<void> initialize_environment(VM& vm) override;
virtual ThrowCompletionOr<void> execute_module(VM& vm, GC::Ptr<PromiseCapability> capability) override;
private:
SourceTextModule(Realm&, StringView filename, Script::HostDefined* host_defined, bool has_top_level_await, NonnullRefPtr<Program> body, Vector<ModuleRequest> requested_modules, Vector<ImportEntry> import_entries, Vector<ExportEntry> local_export_entries, Vector<ExportEntry> indirect_export_entries, Vector<ExportEntry> star_export_entries, Optional<Utf16FlyString> default_export_binding_name);
// Constructor for the Rust pipeline (pre-computed metadata, no AST).
SourceTextModule(Realm&, StringView filename, Script::HostDefined* host_defined, bool has_top_level_await, Vector<ModuleRequest> requested_modules, Vector<ImportEntry> import_entries, Vector<ExportEntry> local_export_entries, Vector<ExportEntry> indirect_export_entries, Vector<ExportEntry> star_export_entries, Optional<Utf16FlyString> default_export_binding_name, Vector<Utf16FlyString> var_declared_names, Vector<LexicalBinding> lexical_bindings, Vector<FunctionToInitialize> functions_to_initialize, GC::Ptr<Bytecode::Executable> executable, GC::Ptr<SharedFunctionInstanceData> tla_shared_data);
virtual void visit_edges(Cell::Visitor&) override;
RefPtr<Program> m_ecmascript_code; // [[ECMAScriptCode]]
NonnullOwnPtr<ExecutionContext> m_execution_context; // [[Context]]
GC::Ptr<Object> m_import_meta; // [[ImportMeta]]
Vector<ImportEntry> m_import_entries; // [[ImportEntries]]
Vector<ExportEntry> m_local_export_entries; // [[LocalExportEntries]]
Vector<ExportEntry> m_indirect_export_entries; // [[IndirectExportEntries]]
Vector<ExportEntry> m_star_export_entries; // [[StarExportEntries]]
Vector<Utf16FlyString> m_var_declared_names;
Vector<LexicalBinding> m_lexical_bindings;
Vector<FunctionToInitialize> m_functions_to_initialize;