Implementation Status

Last Updated: July 3, 2025 Status: Comprehensive implementation tracking

This document provides a clear overview of what's currently implemented, what's under development, and what's planned for future releases.

Legend

  • ✅ Implemented: Feature works as documented
  • 🚧 Partial: Basic functionality available, but with limitations
  • 📋 Planned: Future feature, implementation timeline provided
  • ❌ Not Started: Not yet in development

Core Runtime Components

Engine and Configuration

  • ✅ WasmEngine creation and management
  • ✅ WasmConfig with fluent API
  • ✅ Optimization levels (None, Speed, SpeedAndSize)
  • ✅ Debug information control
  • ✅ Profiling strategies configuration
  • ✅ Resource management (automatic cleanup)

Store Management

  • ✅ WasmStore creation and management
  • ✅ Store isolation and context management
  • ✅ Fuel consumption tracking (when enabled)
  • ✅ Epoch deadlines for interruption

Module System

  • ✅ WasmModule creation from bytes
  • ✅ WAT to WASM compilation (wat2wasm)
  • ✅ Module validation (validate function)
  • 🚧 Export enumeration (returns placeholder data)
  • 🚧 Import enumeration (returns placeholder data)
  • 📋 Complete module introspection (Q4 2025)

Instance Management

  • ✅ WasmInstance creation
  • ✅ Basic instantiation process
  • 🚧 Instance export access (limited)
  • 📋 Complete export resolution (Q4 2025)

Value System

Value Types

  • ✅ WasmI32, WasmI64 (32/64-bit integers)
  • ✅ WasmF32, WasmF64 (32/64-bit floats)
  • ✅ WasmFuncRef (function references)
  • ✅ WasmExternRef (external references)
  • ✅ WasmV128 (128-bit SIMD vectors)

Type Conversion

  • ✅ iswasmconvertible (type validation)
  • 🚧 towasm/fromwasm (under development)
  • 📋 Automatic conversion (Q1 2026)

WebAssembly Objects

Function Operations

  • ✅ WasmFunc types and structures
  • ✅ Function type validation
  • ❌ Function calling (call, gettypedfunc)
  • 📋 Function calling API (Q4 2025)
  • 📋 Multi-value returns (Q1 2026)

Memory Operations

  • ✅ WasmMemory type definitions
  • ❌ Memory access (read/write operations)
  • ❌ Memory growth (grow operations)
  • 📋 Memory API (Q1 2026)

Global Variables

  • ✅ WasmGlobal type definitions
  • ❌ Global access (get/set operations)
  • ❌ Global modification (mutable globals)
  • 📋 Global API (Q1 2026)

Table Operations

  • ✅ WasmTable type definitions
  • ❌ Table access (get/set operations)
  • ❌ Table growth (grow operations)
  • 📋 Table API (Q1 2026)

Error Handling

Error Types

  • ✅ WasmtimeError exception type
  • ✅ Trap handling (WasmTrap)
  • ✅ Error propagation from C library
  • ✅ Descriptive error messages

Error Integration

  • ✅ Julia exception system integration
  • ✅ Resource cleanup on errors
  • ✅ Safe error recovery

Utilities and Helpers

Utility Functions

  • ✅ wat2wasm string macro support
  • ✅ WasmLimits for resource limits
  • ✅ Vector utilities (WasmVec types)
  • ✅ Type checking utilities

Development Support

  • ✅ Debug logging infrastructure
  • ✅ Resource tracking for development
  • ✅ Memory safety checks

Performance Features

Optimization

  • ✅ Compilation optimization levels
  • ✅ Engine reuse patterns
  • ✅ Module caching support
  • 📋 Function call optimization (when function calling is available)

Profiling

  • ✅ VTune profiling support
  • ✅ JIT dump profiling support
  • ✅ Performance map profiling

Development Timeline

Q4 2025 (Priority Features)

  • Function calling API implementation
  • Complete export/import resolution
  • Module introspection enhancement
  • Basic function performance optimization

Q1 2026 (Object Access)

  • Memory access and manipulation
  • Global variable operations
  • Table operations
  • Multi-value function returns

Q2 2026 (Advanced Features)

  • Advanced type conversion system
  • WebAssembly component model support
  • Performance optimization tools
  • Advanced debugging features

Q3 2026 (Ecosystem)

  • Integration with Julia package ecosystem
  • Advanced testing frameworks
  • Performance benchmarking tools
  • Documentation and examples expansion

Testing Status

Test Coverage

  • ✅ Engine/Store/Config tests
  • ✅ WAT compilation tests
  • ✅ Value type tests
  • ✅ Error handling tests
  • ✅ Resource management tests
  • 🚧 Module/Instance tests (partial)
  • 📋 Function calling tests (when implemented)

Test Infrastructure

  • ✅ CI/CD pipeline integration
  • ✅ Cross-platform testing
  • ✅ Memory leak detection
  • ✅ Performance regression detection

User Experience

Documentation

  • ✅ Getting started guide (updated)
  • ✅ Core concepts documentation
  • ✅ Configuration guide
  • ✅ Error handling guide
  • 🚧 API reference (ongoing updates)
  • 📋 Advanced tutorials (Q4 2025)

Examples

  • ✅ Basic usage examples
  • ✅ WAT compilation examples
  • ✅ Configuration examples
  • 📋 Function calling examples (when available)
  • 📋 Advanced patterns examples (Q1 2026)

Known Limitations

Current Limitations

  1. Function calling - Not yet implemented
  2. Object access - Memory, globals, tables not accessible
  3. Module introspection - Limited to placeholder data
  4. Multi-value returns - Not supported
  5. Component model - Not implemented

Performance Limitations

  1. No function call optimization - Cannot optimize calls that don't exist
  2. Limited caching - Object-level caching not available
  3. No specialized paths - Generic paths only

API Limitations

  1. Incomplete export resolution - Cannot access individual exports
  2. No import satisfaction - Cannot provide imports to modules
  3. Limited type conversion - Manual conversion only

Migration Path

When Function Calling is Available

# Current (placeholder for planning)
instance = WasmInstance(store, module_obj)

# Future (when implemented)
result = call(instance, "function_name", [arg1, arg2])
typed_func = get_typed_func(instance, "function_name", [ArgType1, ArgType2], ReturnType)

When Object Access is Available

# Current (not available)
# memory = get_memory(instance, "memory")

# Future (when implemented)
memory = get_memory(instance, "memory")
data = read_memory(memory, 0, 100)

Contributing

High-Priority Areas

  1. Function calling implementation
  2. Export/import resolution
  3. Object access APIs
  4. Performance optimization
  5. Documentation examples

Development Guidelines

  • Follow the established patterns in existing code
  • Add comprehensive tests for new features
  • Update documentation with implementation status
  • Maintain backward compatibility
  • Consider performance implications

Conclusion

WasmtimeRuntime.jl has a solid foundation with core runtime components fully implemented. The focus for the next phase is enabling function calling and object access, which will unlock the full potential of WebAssembly integration with Julia.

The implementation strategy prioritizes:

  1. Core functionality first (function calling)
  2. User experience (complete examples that work)
  3. Performance (optimization opportunities)
  4. Advanced features (component model, etc.)

This status document will be updated as features are implemented and timelines are refined.