My working unpac space for OCaml projects in development
Add comprehensive implementation roadmap to STATUS.md
Based on detailed analysis of QuickJS C source code (~60,000 lines):
- Document 11 implementation phases with status tracking
- Phase 1: Core built-ins (Object, Array, String, Number, Math, JSON)
- Phase 2: Runtime infrastructure (property descriptors, prototype chain)
- Phase 3: Async & generators (Promise, job queue, async/await)
- Phase 4: Collections (Map, Set, WeakMap, WeakSet)
- Phase 5: TypedArrays & binary data
- Phase 6: RegExp execution engine
- Phase 7: Reflection (Proxy, Reflect, Symbol)
- Phase 8: Date & Intl
- Phase 9: Module system
- Phase 10: Memory management (GC, WeakRef)
- Phase 11: Additional features (eval, URI functions)
Also added:
- Architecture comparison with C QuickJS
- Line counts for completed components
- Implementation priority matrix
- Key differences from C implementation
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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# ocaml-quickjs
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**Status: ACTIVE DEVELOPMENT - 100% Test262 Pass Rate (52,631 tests)**
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**Status: ACTIVE DEVELOPMENT - 100% Test262 Parser Conformance**
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## Overview
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## Current State
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The project has a complete JavaScript lexer and parser with full ES2024 conformance:
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### Parser (Complete)
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### Test Results
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Full ES2024 parser with 100% Test262 conformance:
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- **Test262 Conformance**: 100% pass rate (52,631 / 52,633 tests)
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- **Skipped**: 2 staging tests that conflict with finalized ES spec
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- **Failures**: 0
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The 2 skipped tests are V8 staging tests that expect `using` declarations to work directly in switch case clauses, but the finalized ES2024 spec explicitly requires a Syntax Error. Per test262 documentation, staging tests "do not count towards the test262 coverage requirement."
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### Compiler (Partial)
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Basic bytecode compiler that handles most language constructs:
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- Literals, expressions, operators
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- Control flow (if, loops, switch, try/catch)
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- Functions, classes, closures
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- Variable declarations and scoping
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### Runtime (Partial)
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Basic interpreter with value types and execution:
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- Value types: Undefined, Null, Bool, Int, Float, String, Symbol, BigInt, Object
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- Basic property access
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- Type conversions
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- Function calls
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- Exception handling
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---
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## Remaining Features
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Based on analysis of QuickJS C source (~60,000 lines in quickjs.c):
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### Phase 1: Core Built-in Objects (Essential)
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These are required for almost any JavaScript code to run:
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| Object | Status | Description |
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|--------|--------|-------------|
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| **Object** | Stub | Object.create, keys, values, entries, assign, freeze, seal, defineProperty, getPrototypeOf |
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| **Array** | Stub | Constructor, isArray, from, of, push, pop, shift, unshift, slice, splice, forEach, map, filter, reduce, find, indexOf, includes, join, sort, reverse, flat, flatMap |
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| **String** | Stub | Constructor, charAt, charCodeAt, slice, substring, split, trim, toLowerCase, toUpperCase, indexOf, includes, replace, replaceAll, match, search, padStart, padEnd, repeat, startsWith, endsWith |
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| **Number** | Stub | Constructor, parseInt, parseFloat, toFixed, toPrecision, isNaN, isFinite, isInteger |
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| **Boolean** | Stub | Constructor, valueOf |
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| **Math** | Missing | PI, E, sin, cos, tan, sqrt, pow, random, floor, ceil, round, abs, min, max, log, exp |
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| **JSON** | Missing | parse, stringify |
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| **Error** | Partial | Error, TypeError, ReferenceError, SyntaxError, RangeError, URIError, EvalError, AggregateError |
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### Phase 2: Runtime Infrastructure
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| Component | Status | Description |
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|-----------|--------|-------------|
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| **Property Descriptors** | Partial | Full defineProperty semantics, getters/setters |
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| **Prototype Chain** | Partial | Proper inheritance, hasOwnProperty |
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| **Strict Mode** | Partial | Full strict mode semantics |
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| **TDZ (Temporal Dead Zone)** | Stub | For let/const bindings |
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| **Closure Capture** | Partial | Variable capture in closures |
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| **Destructuring** | Partial | Full destructuring in all contexts |
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| **Spread Operator** | Partial | In function calls, arrays, objects |
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### Phase 3: Async & Generators
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| Feature | Status | Description |
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|---------|--------|-------------|
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| **Promise** | Stub | Constructor, then, catch, finally, resolve, reject, all, allSettled, race, any |
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| **Job Queue** | Missing | Microtask queue for Promise resolution |
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| **Async Functions** | Stub | async/await execution |
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| **Generators** | Stub | yield, yield*, iterator protocol |
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| **Async Generators** | Missing | Async iteration |
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| **for-await-of** | Stub | Async iteration |
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### Phase 4: Collections
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| Object | Status | Description |
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|--------|--------|-------------|
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| **Map** | Stub | Full Map implementation with iteration |
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| **Set** | Stub | Full Set implementation with iteration |
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| **WeakMap** | Stub | Weak references to keys |
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| **WeakSet** | Stub | Weak references to values |
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### Phase 5: TypedArrays & Binary Data
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| Object | Status | Description |
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|--------|--------|-------------|
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| **ArrayBuffer** | Stub | Binary data buffer |
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| **SharedArrayBuffer** | Missing | Shared memory for workers |
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| **DataView** | Missing | Low-level binary access |
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| **TypedArrays** | Stub | Int8Array, Uint8Array, Uint8ClampedArray, Int16Array, Uint16Array, Int32Array, Uint32Array, Float32Array, Float64Array, BigInt64Array, BigUint64Array |
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### Completed Components
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### Phase 6: RegExp Engine
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- **Lexer** (`lib/quickjs/parser/lexer.ml`)
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- Full ECMAScript 2024 token recognition
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- Unicode identifier support (ID_Start, ID_Continue)
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- Numeric literals with separators (1_000_000)
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- BigInt literals
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- Template literals with proper escape handling
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- Regular expression literals with all ES2024 flags
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- Automatic semicolon insertion support
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- Strict mode detection and enforcement
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- Private field identifiers (#name)
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- Hashbang comments
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| Component | Status | Description |
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|-----------|--------|-------------|
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| **RegExp Validator** | Complete | Pattern validation (in parser) |
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| **RegExp Execution** | Missing | Full regex execution engine (libregexp equivalent) |
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| **exec()** | Missing | Execute regex and return matches |
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| **test()** | Missing | Test if regex matches |
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| **Capture Groups** | Missing | Named and numbered captures |
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| **Lookahead/Lookbehind** | Missing | Assertions |
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- **Parser** (`lib/quickjs/parser/parser.ml`)
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- Complete expression parsing (arithmetic, logical, ternary, nullish coalescing, etc.)
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- Statement parsing (if, for, while, switch, try/catch, with, etc.)
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- Function declarations and expressions (sync, async, generator)
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- Arrow functions with proper parameter handling
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- Class declarations and expressions with all features:
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- Public/private fields and methods
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- Static fields and methods
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- Getters and setters
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- Computed property names
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- Class static blocks
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- Destructuring patterns (array and object)
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- Spread/rest operators
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- Module syntax (import/export) with all variants
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- Import attributes (`import x from "y" with { type: "json" }`)
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- Dynamic import (`import()`, `import.meta`, `import.source`, `import.defer`)
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- Explicit resource management (`using` and `await using` declarations)
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- Decorators
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- Full strict mode validation
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- All ES2024 early error detection
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### Phase 7: Reflection & Metaprogramming
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- **RegExp Validator** (`lib/quickjs/parser/regexp_validator.ml`)
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- Full regular expression pattern validation
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- Unicode property escapes (\p{...}, \P{...})
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- Named capture groups
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- All ES2024 regex flags (d, g, i, m, s, u, v, y)
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| Object | Status | Description |
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|--------|--------|-------------|
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| **Proxy** | Stub | All trap handlers (get, set, has, deleteProperty, etc.) |
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| **Reflect** | Missing | Reflect API (get, set, has, etc.) |
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| **Symbol** | Partial | Well-known symbols (iterator, toStringTag, toPrimitive, etc.) |
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| **Symbol.for** | Missing | Global symbol registry |
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- **Unicode Properties** (`lib/quickjs/parser/unicode_properties.ml`)
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- Complete Unicode property data for regex validation
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- General categories, scripts, binary properties
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### Phase 8: Date & Internationalization
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### Project Structure
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| Object | Status | Description |
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|--------|--------|-------------|
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| **Date** | Stub | Full Date implementation |
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| **Intl** | Missing | Internationalization API (optional, large) |
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### Phase 9: Module System
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| Feature | Status | Description |
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|---------|--------|-------------|
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| **Module Loading** | Missing | Load and link modules |
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| **Module Resolution** | Missing | Resolve module specifiers |
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| **import/export** | Parser only | Runtime module handling |
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| **Dynamic import()** | Missing | Runtime import() |
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| **import.meta** | Missing | Module metadata |
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### Phase 10: Memory Management
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| Component | Status | Description |
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|-----------|--------|-------------|
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| **Reference Counting** | Missing | Basic memory management |
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| **Cycle Detection** | Missing | Handle reference cycles |
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| **GC** | Missing | Full garbage collection |
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| **Memory Limits** | Missing | JS_SetMemoryLimit equivalent |
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| **WeakRef** | Missing | Weak references |
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| **FinalizationRegistry** | Missing | Cleanup callbacks |
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### Phase 11: Additional Features
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| Feature | Status | Description |
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|---------|--------|-------------|
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| **eval()** | Missing | Dynamic code evaluation |
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| **Function constructor** | Missing | new Function() |
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| **globalThis** | Missing | Global object access |
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| **URI functions** | Missing | encodeURI, decodeURI, encodeURIComponent, decodeURIComponent |
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| **Atomics** | Missing | Atomic operations (requires SharedArrayBuffer) |
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| **Iterator Helpers** | Missing | Iterator.from, map, filter, take, drop, etc. |
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---
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## Completed Components
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### Parser (`lib/quickjs/parser/`)
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| File | Lines | Description |
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|------|-------|-------------|
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| `lexer.ml` | ~2,500 | Full ES2024 lexer |
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| `parser.ml` | ~6,500 | Full ES2024 parser |
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| `ast.ml` | ~600 | AST type definitions |
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| `token.ml` | ~400 | Token definitions |
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| `source.ml` | ~100 | Source location handling |
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| `regexp_validator.ml` | ~1,200 | RegExp pattern validation |
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| `unicode_properties.ml` | ~3,000 | Unicode property data |
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### Compiler (`lib/quickjs/compiler/`)
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| File | Lines | Description |
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|------|-------|-------------|
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| `opcode.ml` | ~650 | Bytecode opcode definitions |
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| `bytecode.ml` | ~300 | Bytecode builder |
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| `compiler.ml` | ~1,200 | AST to bytecode compiler |
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### Runtime (`lib/quickjs/runtime/`)
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| File | Lines | Description |
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|------|-------|-------------|
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| `value.ml` | ~430 | JavaScript value types |
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| `context.ml` | ~220 | Execution context |
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| `interpreter.ml` | ~930 | Bytecode interpreter |
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---
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## Architecture Comparison with C QuickJS
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### C QuickJS Structure
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```
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quickjs.c ~59,500 lines - Main engine (compiler + runtime + builtins)
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quickjs.h ~1,200 lines - Public API
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quickjs-opcode.h ~370 lines - Opcode definitions
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libregexp.c ~2,800 lines - RegExp engine
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libunicode.c ~1,200 lines - Unicode support
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quickjs-libc.c ~4,200 lines - Standard library (os, std modules)
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```
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### Key C QuickJS Internal Structures
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| Structure | Purpose | OCaml Equivalent |
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|-----------|---------|------------------|
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| `JSRuntime` | GC, atoms, shapes | `context.ml` (partial) |
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| `JSContext` | Execution context | `context.ml` |
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| `JSValue` | Tagged value union | `value.ml` |
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| `JSObject` | Object with shape | `value.ml: js_object` |
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| `JSShape` | Object property layout | Missing (use Hashtbl) |
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| `JSFunctionBytecode` | Compiled function | `bytecode.ml` |
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| `JSStackFrame` | Call frame | `context.ml: stack_frame` |
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| `JSAtomStruct` | Interned string | `context.ml: AtomTable` |
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### Key Differences
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1. **Shapes**: C QuickJS uses shapes for efficient property access. OCaml version uses Hashtbl.
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2. **GC**: C version has reference counting + cycle collector. OCaml relies on OCaml GC.
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3. **BigInt**: C version uses custom implementation. OCaml uses zarith library.
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4. **Unicode**: C version uses libunicode. OCaml uses uucp library.
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---
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## Project Structure
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```
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lib/quickjs/
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├── parser/
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│ ├── lexer.ml # JavaScript lexer
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│ ├── lexer.mli # Lexer interface
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│ ├── parser.ml # JavaScript parser
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│ ├── parser.mli # Parser interface
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│ ├── ast.ml # AST types
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│ ├── token.ml # Token definitions
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│ ├── token.mli # Token interface
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│ ├── ast.ml # AST types
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│ ├── ast.mli # AST interface
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│ ├── source.ml # Source location handling
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│ ├── regexp_validator.ml # RegExp pattern validation
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│ ├── regexp_validator.mli # RegExp validator interface
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│ └── unicode_properties.ml # Unicode property data
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├── compiler/
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│ └── compiler.ml # Bytecode compiler
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│ ├── opcode.ml # Bytecode opcodes
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│ ├── bytecode.ml # Bytecode builder
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│ └── compiler.ml # AST to bytecode
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└── runtime/
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├── value.ml # JavaScript values
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├── context.ml # Execution context
···
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# Build
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dune build
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# Run Test262 conformance suite
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# Run Test262 conformance suite (parser only)
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dune exec test/runner/test262_runner.exe
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# Run a single test
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dune exec test/runner/test262_runner.exe -- --verbose
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```
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## Next Steps
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## Implementation Priority
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### Immediate (Enable basic JS execution)
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1. Object built-in methods
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2. Array built-in methods
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3. String built-in methods
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4. Math object
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5. JSON.parse/stringify
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1. Complete bytecode compiler implementation
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2. Implement JavaScript runtime/interpreter
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3. Add built-in objects (Array, Object, String, etc.)
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4. Implement garbage collection
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### Short-term (Common JS patterns)
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1. Promise + job queue
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2. Map/Set collections
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3. Full error handling
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4. Proper prototype chain
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### Medium-term (Full ES compliance)
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1. RegExp execution engine
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2. Generator functions
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3. Async/await
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4. Proxy/Reflect
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5. Module system
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### Long-term (Performance & completeness)
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1. Memory management optimization
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2. TypedArrays
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3. Intl (large, may be optional)
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4. Atomics (multi-threading)
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## References
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