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https://github.com/LadybirdBrowser/ladybird.git
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6cdfbd01a6
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.
44 lines
1.3 KiB
C++
44 lines
1.3 KiB
C++
/*
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* Copyright (c) 2026, Andreas Kling <andreas@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/StringBuilder.h>
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#include <LibJS/PipelineComparison.h>
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#include <stdlib.h>
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namespace JS {
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bool compare_pipelines_enabled()
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{
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static bool const enabled = getenv("LIBJS_COMPARE_PIPELINES") != nullptr;
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return enabled;
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}
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static void report_mismatch(StringView kind, StringView rust_dump, StringView cpp_dump, StringView context)
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{
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StringBuilder message;
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message.appendff("PIPELINE MISMATCH ({}) in: {}\n", kind, context);
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message.appendff("\n=== Rust {} ===\n{}\n", kind, rust_dump);
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message.appendff("\n=== C++ {} ===\n{}\n", kind, cpp_dump);
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warnln("{}", message.string_view());
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VERIFY_NOT_REACHED();
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}
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void compare_pipeline_asts(StringView rust_ast, StringView cpp_ast, StringView context)
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{
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if (rust_ast != cpp_ast)
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report_mismatch("AST"sv, rust_ast, cpp_ast, context);
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}
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void compare_pipeline_bytecode(StringView rust_bytecode, StringView cpp_bytecode, StringView context, StringView ast_dump)
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{
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if (rust_bytecode != cpp_bytecode) {
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if (!ast_dump.is_empty())
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warnln("\n=== AST (both identical) ===\n{}", ast_dump);
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report_mismatch("Bytecode"sv, rust_bytecode, cpp_bytecode, context);
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}
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}
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}
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