# Changelog

## \[0.2.4] - 2026-06-03

### 🎯 **Dashboard Precision and Release Stabilization**

This release focuses on making the Dashboard analysis output more precise, faster to navigate, and safer to interpret before publishing the next crate version.

#### **Bug Fixes**

- **fix(dashboard)**: Restored hidden Dashboard sections caused by missing closing `</div>` tags
  - Fixed `mode-variable` nesting before the Passport section
  - Fixed `mode-timetravel` nesting before the Unsafe/FFI section
  - Prevents Passport, Time Travel, and Unsafe/FFI views from appearing empty when mode switching hides their parent section
- **fix(heap_scanner)**: Raised the virtual pointer threshold from 1 TB to 128 PB
  - Avoids false virtual-pointer detection on macOS heap addresses such as `0x600000000000`
  - Fixes `test_heap_scanner_scan_real_allocations` on macOS
- **fix(reconstruction)**: Applied `clone_info_map` to all reconstructed allocations
  - Previously clone metadata was only applied to smart-pointer allocations
  - Fixes `test_rebuild_clone_relationship`
- **fix(testing)**: Stabilized the system monitor test and removed dead-field warnings
  - Keeps CI and release validation output cleaner
- **fix(ci)**: Removed repository-level forced `sccache` and `mold` Cargo configuration
  - Fixes GitHub Actions failures where `cargo clippy` and `cargo llvm-cov` tried to execute unavailable `sccache`
  - Keeps optional build acceleration in user-level Cargo config or environment variables instead of repo-wide config

#### **Dashboard and Analysis Improvements**

- **feat(precision)**: Added precision labels for analysis output
  - Added `EvidenceLevel`: Observed / Inferred / Heuristic / Unknown
  - Added `RiskConfidence`: Confirmed / Likely / Possible / Unknown
  - Added `PointerProvenance`: Allocator / Clone / SmartPointer / Reallocation / FfiInput / FfiOutput / Unknown
  - Added `DropExpectation`: NormalDrop / ManualDrop / Forgotten / ForeignFree / RustReclaim / NoDropNeeded / Unknown
  - Displays evidence, confidence, provenance, and generation indicators in allocation tables, lifecycle tooltips, and detail panels
- **feat(reconstruction)**: Added allocation `generation_id` tracking
  - Tracks per-pointer generations to distinguish address reuse
  - Shows generation badges such as `G1` and `G2` in event browser views and tooltips
- **feat(frontend)**: Added `DataIndex` for O(1) frontend lookups
  - Replaces hot-path linear `Array.find()` usage in Time Travel details
  - Adds an event summary card with total event count and sampling status

#### **Unsafe, FFI, and Graph Views**

- **feat(unsafe)**: Added Unsafe Call-Stack View grouped by source location
  - Shows expandable groups, risk badges, risk factors, boundary call-stack chains, and navigation buttons
- **feat(ffi)**: Enhanced FFI Boundary Flow visualization
  - Sorts flow events by timestamp and color-codes Rust-to-FFI, FFI-to-Rust, ownership-transfer, and shared-access events
  - Highlights mismatch cases and adds flow count/mismatch badges
- **feat(task_graph)**: Upgraded Task Hierarchy Visualization with interactive D3 zoom, pan, drag, auto-fit, and adaptive container height
- **feat(thread_graph)**: Added Thread Relationship Graph and detail panel in thread mode
- **feat(variable_graph)**: Added `Dashboard.variableGraph.selectNode(ptr)` for programmatic node selection

#### **Build and Engineering**

- **build**: Pinned the Rust toolchain to `1.92.0` with `rust-toolchain.toml`
- **build**: Kept workspace Cargo configuration portable for CI, crates.io packaging, and local development
- **refactor(renderer)**: Split Dashboard rendering into event DTO, event reconstruction, inference, report builder, and shared type modules
- **chore**: Cleaned clippy warnings in detector doctests, async tracker code, and scope metadata handling

***

## \[0.2.3] - 2026-04-19

### 🌳 **Task Tracking and Task Graph Visualization**

This update implements a complete task tracking system with task hierarchy tracking and memory allocation association, providing Task Graph visualization in the Dashboard.

#### **Data Collection Upgrade Strategy**

- **Data Dimension Expansion**: Added task dimension to memory tracking system
  - `MemoryEvent` added `task_id: Option<u64>` field to record allocation task association
  - `AllocationInfo` added `task_id: Option<u64>` field to support task-grouped analysis
  - `TaskMeta` added `memory_usage` and `allocation_count` fields for real-time task memory statistics
- **Task Registry System**: Implemented `TaskIdRegistry` global singleton
  - Thread-local storage `current_task_id` for zero-cost access
  - `spawn_task()` and `complete_task()` manage task lifecycle
  - `record_allocation()` automatically updates task memory statistics
  - Collision detection mechanism ensures task ID uniqueness
- **Data Export Enhancement**: Added task relationship graph export
  - `export_task_graph_json()` exports nodes and edges data
  - Nodes include actual memory\_usage and allocation\_count statistics
  - Integrated into `export_all_json()` and Dashboard context

#### **Dashboard Task Graph Visualization**

- **feat(dashboard)**: Added "Task Graph" tab and D3.js tree view
  - HTML template added Task Graph tab button
  - D3.js tree rendering for task hierarchy
  - Click task to view memory details panel
  - Empty state hints and task count display
- **fix(dashboard)**: Fixed JavaScript syntax errors
  - Fixed compressed one-line method formatting
  - Added DOM element null checks
  - Removed duplicate `task_graph_json` variable declaration

#### **API Simplification**

- **feat(task\_registry)**: Added `TaskGuard` RAII structure
  - `task_scope()` method returns `TaskGuard` for automatic task lifecycle management
  - Automatically sets parent relationship (from current task\_id)
  - Simplified API: just declare registry, call task\_scope, auto-complete and export

#### **Examples and Demos**

- **feat(examples)**: `global_tracker_showcase` added Task Registry demo
  - Section 6: Task Tracking with TaskIdRegistry
  - Demonstrates task hierarchy and memory allocation tracking

***

## \[0.2.2] - 2026-04-17

### 🎯 **Arc Clone Detection Enhancement**

This update adds comprehensive Arc/Rc clone detection capability through stack allocation tracking.

#### **Stack Allocation Tracking**

- **feat(tracker)**: Added `StackOwner` track kind for smart pointers
  - `TrackKind::StackOwner` tracks stack-allocated smart pointers (Arc, Rc) with their heap targets
  - Captures both `stack_ptr` (stack address of the smart pointer) and `heap_ptr` (heap allocation it points to)
  - Enables detection of Arc/Rc clones by identifying multiple stack pointers pointing to the same heap allocation
- **feat(types)**: Extended `MemoryEvent`, `AllocationInfo`, `ActiveAllocation`, `InferenceRecord` with `stack_ptr` field
  - `stack_ptr: Option<usize>` stores the stack address of StackOwner objects
  - Preserves clone detection metadata through the entire analysis pipeline
- **feat(lib)**: Implemented `Trackable` for `Arc<T>` and `Rc<T>`
  - Returns `TrackKind::StackOwner` with stack\_ptr and heap\_ptr
  - Correctly identifies these as stack-allocated smart pointers pointing to heap data

#### **Relation Inference Enhancement**

- **feat(relation)**: Added `ArcClone` and `RcClone` relation variants
  - `Relation::ArcClone` for Arc-specific clone relationships
  - `Relation::RcClone` for Rc-specific clone relationships
  - Distinguishes between different smart pointer types in the ownership graph
- **feat(shared\_detector)**: Enhanced shared reference detection
  - Strategy 2: StackOwner-based clone detection
  - Groups StackOwner allocations by their heap\_ptr
  - Generates `ArcClone` edges for multiple Arc objects pointing to the same heap allocation
  - Does not rely on type\_kind inference (UTI Engine may misclassify Arc as Vec)
- **fix(shared\_detector)**: Changed from `Relation::Shares` to `Relation::ArcClone` for StackOwner-based detection
  - More accurate representation of Arc clone relationships
  - Enables proper counting and visualization in the dashboard

#### **Graph and Visualization**

- **fix(graph)**: Updated `get_relationship_stats` to handle `ArcClone` and `RcClone`
  - Both counted as clone edges in statistics
- **fix(export)**: Updated `build_ownership_graph_from_allocations` edge mapping
  - `Relation::ArcClone` → `EdgeKind::ArcClone`
  - `Relation::RcClone` → `EdgeKind::RcClone`
- **fix(dashboard)**: Updated `build_relationships` display properties
  - `ArcClone`: purple color (#8b5cf6), strength 0.7
  - `RcClone`: green color (#10b981), strength 0.9
- **fix(ownership\_graph)**: Fixed `diagnostics` method
  - Changed from using `self.arc_clone_count` (only set by `OwnershipOp::ArcClone` events)
  - To using `self.arc_clones().len()` (counts `EdgeKind::ArcClone` edges)
  - Ensures Arc clone count reflects relation inference results

#### **Bug Fixes**

- **fix(tracker)**: StackOwner allocation tracking
  - Uses `stack_ptr` as key for `track_allocation` to avoid overwriting Arc clones
  - Allows inner tracker to count allocations while preserving clone detection capability
  - Fixed `test_smart_pointer_tracking` test failure
- **fix(example)**: Updated `variable_relationships_showcase` example
  - Uses `global.tracker()` to get the internal `Tracker` instead of `GlobalTracker`
  - Ensures correct method calls for tracking and analysis

#### **Testing**

- **test(shared\_detector)**: Added `test_stackowner_arc_clone_detection`
  - Validates StackOwner-based Arc clone detection with real data
  - Tests detection of 3 Arc clones pointing to the same heap allocation
  - Confirms `ArcClone` edges are correctly generated
- **fix(compilation)**: Added `stack_ptr: None` to all `AllocationInfo` and `ActiveAllocation` initializers
  - Fixed compilation errors across multiple test files
  - Updated: relation\_inference\_integration, circular\_reference, heap\_scanner, container\_detector, variable\_relationships, closure/analyzer, security/analyzer, unknown/analyzer, snapshot/types

#### **Verification**

- Example `variable_relationships_showcase` now shows `arc_clone_count: 57` (previously 0)
- Unit test `test_stackowner_arc_clone_detection` passes
- All 2449 unit tests pass

## \[0.2.1] - 2026-04-12

### 📊 **Benchmark Optimization and Documentation Enhancement**

This update focuses on optimizing the benchmark system and completing the project documentation.

#### **Benchmark Optimization**

- **feat(bench)**: Added quick mode support
  - New environment variable `QUICK_BENCH` to control execution mode
  - Quick mode runtime: \~5 minutes (vs 40 minutes)
  - Sample size: 10 (vs 100)
  - Warm-up time: 100ms (vs 3s)
  - Measurement time: 500ms (vs 5s)
  - Performance improvement: \~13x faster
- **feat(bench)**: Added new benchmark scenarios
  - Memory allocator comparison tests (3 tests)
  - Long-running stability tests (3 tests)
  - Edge case tests (5 tests)
  - Performance regression detection tests (3 tests)
  - Total: 14 new test scenarios
- **feat(makefile)**: Makefile support for multiple benchmark modes
  - `make bench-quick`: Quick mode (\~5 minutes)
  - `make bench`: Full mode (\~60 minutes)
  - `make bench-save`: Run and save results
  - `make bench-allocator`: Allocator comparison tests
  - `make bench-stability`: Stability tests
  - `make bench-edge`: Edge case tests
  - `make bench-regression`: Regression detection tests

#### **Documentation Enhancement**

- **docs(structure)**: Reorganized documentation directory structure
  - Created `docs/` directory for centralized documentation management
  - Moved benchmark guides and performance reports to docs directory
  - Created documentation index `docs/README.md`
- **docs(architecture)**: Enhanced architecture documentation
  - Added detailed Analysis module architecture (14 submodules)
  - Added detailed Capture module architecture (3 submodules)
  - Added Unified Analyzer architecture explanation
  - Added multiple mermaid architecture diagrams
  - Documented functionality and performance characteristics of each submodule
- **docs(modules)**: Added missing module documentation
  - Added `tracking` module documentation (Chinese & English)
  - Added `analyzer` module English documentation
  - Added `view` module English documentation
  - All documentation includes architecture diagrams, API references, and usage examples
- **docs(coverage)**: Created documentation coverage report
  - Analyzed existing documentation coverage
  - Identified missing documentation
  - Provided prioritized recommendations

#### **Performance Data**

- **Test Environment**: Apple M3 Max, macOS Sonoma
- **Backend Performance**: 21-40ns latency
- **Tracking Overhead**: 528ns - 4.72µs
- **Analysis Performance**: 250ns - 35.7ms
- **Concurrency**: Optimal at 4-8 threads, max efficiency 139%

#### **File Changes**

- New Files:
  - `docs/README.md`: Documentation index
  - `docs/DOCUMENTATION_COVERAGE.md`: Documentation coverage report
  - `docs/en/modules/tracking.md`: Tracking module English documentation
  - `docs/zh/modules/tracking.md`: Tracking module Chinese documentation
  - `docs/en/modules/analyzer.md`: Analyzer module English documentation
  - `docs/en/modules/view.md`: View module English documentation
  - `benches/benchmark_results_quick.log`: Quick mode benchmark results
- Updated Files:
  - `README.md`: Added architecture improvements and performance data
  - `docs/ARCHITECTURE.md`: Added detailed module architecture explanations
  - `Makefile`: Added multiple benchmark mode support
  - `benches/comprehensive_benchmarks.rs`: Added quick mode and new tests

***

## \[0.2.0] - 2026-04-09

### 🏗️ **Major Architecture Refactoring: From Monolithic to Modular Engines**

This release represents a complete architectural overhaul of memscope-rs, transitioning from a monolithic structure to a modular engine-based architecture. This refactoring significantly improves code maintainability, extensibility, and thread safety while reducing code size by approximately 75%.

#### **Architecture Changes**

- **BREAKING**: Complete migration from monolithic to 8-engine architecture
  - **Analysis Engine**: Centralized memory analysis logic
  - **Capture Engine**: Unified data collection and tracking
  - **Event Store Engine**: Lock-free centralized event storage
  - **Query Engine**: Unified query interface
  - **Render Engine**: Output rendering and visualization
  - **Snapshot Engine**: Snapshot construction and aggregation
  - **Timeline Engine**: Time-based memory analysis
  - **Metadata Engine**: Centralized metadata management
- **BREAKING**: API changes - Tracking API moved to `memscope_rs::tracker` module
- **BREAKING**: Complete error handling system refactoring
- **BREAKING**: Module reorganization - Many internal modules moved/renamed

#### **Code Quality Improvements**

- **feat(error)**: Unified error handling system
  - Eliminated all unsafe `unwrap()` calls (17+ instances)
  - All lock operations now use `.map_err()` for error handling
  - Added detailed error information for debugging
  - Lock poisoning recovery mechanism
- **feat(safety)**: Enhanced thread safety across all modules
  - SystemMonitor Drop implementation changed to background thread waiting
  - Atomic operations for optimized concurrency performance
  - Thread-safe duplicate tracking prevention
- **refactor(code)**: Massive code reduction
  - Removed \~200,000 lines of redundant code
  - Current codebase: 77,641 lines (down from \~270,000)
  - Improved code density and maintainability

#### **Smart Pointer Tracking Enhancement**

- **fix(variable\_relationships)**: Fixed `node_to_allocation_info` to preserve smart pointer information
  - Now correctly retains Rc/Arc/Box/Weak pointer details
  - Improved circular reference detection accuracy
  - Enhanced relationship inference for smart pointers

#### **Performance Improvements**

- **perf(concurrent)**: Up to 98% improvement in concurrent tracking scenarios
  - Concurrent tracking (1 thread): 5ms → 98µs (-98%)
  - Concurrent tracking (64 threads): 2.5ms → 1.9ms (-25%)
  - High concurrency (128 threads): -35% improvement
- **perf(analysis)**: Analysis operations (small datasets): -91% improvement
  - Analysis (100 elements): 340µs → 30µs (-91%)
- **perf(backend)**: Lockfree allocation: -46% improvement
  - Lockfree allocation: 73ns → 39ns
- **perf(classification)**: Type classification: 1-21% improvement
- **perf(stats)**: Statistics operations: 2-12% improvement

#### **Performance Trade-offs**

- ⚠️ **Regressions** in specific scenarios:
  - Tracker creation: +559% (startup-only impact)
  - Single tracking (small allocations): +11-16%
  - Multi-variable tracking: +17-22%
  - Analysis (large datasets): +333-8884% (needs optimization)
- **Reason for regressions**: Enhanced error handling, detailed statistics collection, additional abstraction layers
- **Net impact**: Most production use cases (high concurrency, realistic workloads) show net performance improvements

#### **New Features**

- **feat(smart\_pointer)**: Comprehensive smart pointer tracking
  - Support for Rc/Arc/Box/Weak smart pointers
  - Reference count tracking
  - Clone relationship detection
  - Circular reference detection
- **feat(event\_store)**: Lock-free event storage
  - High-throughput event recording
  - Point-in-time snapshots
  - Thread-safe concurrent access
- **facade**: Unified facade API for simplified user experience
  - Automatic backend selection
  - Consistent interface across all tracking operations

#### **Testing and Documentation**

- **test**: Comprehensive test coverage across all engines
  - Unit tests for all modules
  - Integration tests
  - Performance tests
  - Boundary condition tests
- **docs**: Updated documentation
  - Architecture documentation reflecting new engine structure
  - Migration guide for API changes
  - Performance benchmarks and analysis
  - Enhanced API documentation

#### **Module Structure Changes**

```
src/
├── analysis_engine/    # NEW: Analysis engine orchestration
├── capture/            # REORG: Capture engine and backends
│   ├── backends/       # Core, Lockfree, Async, Global trackers
│   ├── types/          # Enhanced data types
│   └── platform/       # Platform-specific implementations
├── core/               # REORG: Core types and utilities
├── error/              # NEW: Unified error handling
├── event_store/        # NEW: Event storage engine
├── metadata/           # NEW: Metadata engine
├── query/              # NEW: Query engine
├── render_engine/      # REORG: Output rendering
├── snapshot/           # NEW: Snapshot engine
├── timeline/           # NEW: Timeline engine
└── tracker/            # NEW: Unified tracker API
```

#### **Statistics**

- **525 files changed** with significant modifications
- **66,398 lines added**, **265,022 lines removed**
- **Net reduction**: \~198,624 lines (\~75% code reduction)
- **Current codebase**: 77,641 lines
- **Test coverage**: Comprehensive across all modules
- **Build status**: ✅ 0 errors, 0 warnings, all checks passing

#### **Migration Guide**

**Important Breaking Changes:**

1. **API Changes**:

```rust
// Old API (v0.1.x)
use memscope_rs::{track_var, track_scope};

// New API (v0.2.0)
use memscope_rs::tracker::{track_var, track_scope};
```

1. **Error Handling**:

```rust
// Old API
let result = tracker.track_allocation(ptr, size)
    .expect("Failed to track");

// New API
let result = tracker.track_allocation(ptr, size)
    .map_err(|e| eprintln!("Tracking failed: {}", e))?;
```

1. **Module References**:

```rust
// Old API
use memscope_rs::core::MemoryTracker;

// New API
use memscope_rs::capture::backends::CoreTracker;
```

See [PR Summary](PR_SUMMARY_EN.md) for detailed migration guide.

#### **Known Issues**

- Large dataset analysis performance regression (needs optimization in future releases)
- Some analysis operations on small allocations have increased latency
- Tracker creation overhead (startup-only impact)

#### **Recommendations**

**✅ Recommended for Upgrade:**

- High-concurrency application scenarios
- Applications requiring better error handling
- Projects requiring long-term maintenance
- Projects needing feature extensions

**⚠️ Evaluate Carefully:**

- Applications extremely sensitive to single-tracking latency
- Large-scale memory analysis scenarios (needs further optimization)
- Tracker creation in performance-critical paths

#### **Future Optimization Plans**

1. **Large Data Analysis Optimization**: Improve analysis engine performance for large datasets
2. **Tracker Creation Optimization**: Reduce initialization overhead
3. **Caching Strategy**: Enhance caching mechanisms to reduce redundant computations
4. **Parallel Analysis**: Utilize multi-core for accelerated analysis operations

#### **Credits**

- Architecture refactoring: Major engineering effort
- Performance analysis: Comprehensive benchmark suite
- Documentation: Updated architecture and API guides
- Testing: Extensive test coverage across all modules

***

## Overview

This changelog documents the changes between the `test_a` branch and `master` branch of memscope-rs. The test\_a branch includes code reorganization, new experimental features, and various improvements.

## 🛡️ **Latest Improvements (Drop Logic & Smart Pointer Handling)**

### **TrackedVariable Drop Logic Fixes**

- **Fixed duplicate drop calls**: Added atomic protection to prevent multiple destruction tracking
- **Centralized smart pointer detection**: Created `smart_pointer_utils` module for consistent Rc/Arc/Box handling
- **Improved error handling**: Enhanced error reporting and panic-safe drop logic
- **Removed auto-export from MemoryTracker**: Eliminated performance-impacting file I/O from drop logic
- **Added drop protection mechanisms**: Thread-safe duplicate tracking prevention

### **Key Benefits**

- ✅ **Robust Drop Logic**: Prevents duplicate tracking and ensures accurate memory analysis
- ✅ **Better Performance**: Removed unnecessary auto-export operations from drop
- ✅ **Enhanced Smart Pointer Support**: Consistent handling of Rc, Arc, and Box types
- ✅ **Improved Error Resilience**: Panic-safe error handling prevents drop failures
- ✅ **Thread Safety**: Atomic operations for safe concurrent access

**Statistics:**

- **119 files changed** with modifications
- **146 commits** of incremental development
- **63,905 lines added, 3,469 lines removed** (net +60,436 lines)
- **Code reorganization** with modular structure

***

## 🏗️ **Architecture & Project Structure**

### **Code Reorganization**

#### **1. Module Structure Changes**

- **Before (Master)**: Simple structure with basic modules
- **After (Test\_A)**: Reorganized into specialized modules

**New Module Organization:**

```
src/
├── core/                    # Core tracking functionality
│   ├── allocator.rs        # Memory allocator (moved from root)
│   ├── tracker.rs          # Enhanced memory tracker
│   ├── scope_tracker.rs    # Scope-based tracking (new)
│   └── types/              # Type definitions
├── analysis/               # Analysis modules (new)
│   ├── enhanced_memory_analysis.rs  # Memory analysis
│   ├── unsafe_ffi_tracker.rs       # FFI tracking
│   ├── security_violation_analyzer.rs # Security analysis
│   └── [additional analysis modules]
├── export/                 # Export functionality (reorganized)
│   ├── optimized_json_export.rs    # JSON export optimization
│   ├── quality_validator.rs        # Data validation
│   ├── visualization.rs            # Visualization features
│   └── [additional export modules]
├── cli/                    # Command-line interface (new)
└── [Additional modules]
```

#### **2. Type System Improvements**

- **Enhanced**: `core/types/mod.rs` - Expanded type definitions
- **Added**: Basic smart pointer support for common types
- **Improved**: Type tracking capabilities

***

## 🔧 **Core Functionality Changes**

### **Memory Tracking (`core/tracker.rs`)**

#### **Enhanced Tracking Features**:

- **Smart Pointer Support**: Basic tracking for `Rc<T>`, `Arc<T>`, `Box<T>`
- **Reference Counting**: Experimental reference count tracking
- **Lifecycle Tracking**: Basic allocation-to-deallocation tracking
- **Thread Support**: Multi-threaded tracking capabilities
- **Scope Tracking**: Hierarchical scope organization

#### **Data Collection**:

- **Stack Traces**: Optional backtrace collection (when enabled)
- **Timing Information**: Allocation and deallocation timestamps
- **Thread Information**: Basic per-thread tracking
- **Memory Layout**: Basic memory layout information

### **Analysis Modules**

#### **Memory Analysis (`analysis/enhanced_memory_analysis.rs`)**

- **Memory Leaks**: Simple leak detection functionality
- **Fragmentation**: Basic heap fragmentation reporting
- **Usage Patterns**: Simple memory usage pattern detection
- **Performance**: Basic performance issue identification

#### **FFI Tracking (`analysis/unsafe_ffi_tracker.rs`)**

- **Boundary Tracking**: Basic FFI boundary event tracking
- **Safety Analysis**: Simple safety violation detection
- **Risk Assessment**: Basic risk level calculation

#### **Security Analysis (`analysis/security_violation_analyzer.rs`)**

- **Memory Safety**: Basic memory safety violation detection
- **Pattern Analysis**: Simple use-after-free pattern analysis
- **Compliance**: Basic security compliance reporting

***

## 📊 **Export & Visualization**

### **JSON Export Improvements**

#### **Optimized Export (`export/optimized_json_export.rs`)**

- **Performance**: Attempted optimization for large datasets
- **Buffering**: Improved buffering strategies
- **Validation**: Basic data validation during export

#### **Quality Validation (`export/quality_validator.rs`)**

- **Data Validation**: Basic JSON structure validation
- **Export Modes**: Fast/Slow/Auto export modes (experimental)
- **Error Handling**: Improved error reporting

### **Visualization Enhancements**

#### **SVG Visualizations (`export/visualization.rs`)**

- **Memory Analysis**: Enhanced memory usage visualizations
- **Lifecycle Timeline**: Improved timeline visualizations
- **Interactive Elements**: Basic interactive features

#### **HTML Dashboard**

- **Templates**: Basic HTML dashboard templates
- **JavaScript**: Interactive dashboard functionality
- **CSS**: Styling for dashboard components

***

## 🛠️ **Development Tools**

### **Command Line Interface**

#### **CLI Commands (`cli/commands/`)**

- **Analyze**: Basic analysis command functionality
- **Generate Report**: Report generation capabilities
- **Test**: Testing command utilities

### **Build & Testing**

#### **Build System**

- **Makefile**: Enhanced build targets
- **CI/CD**: Improved GitHub Actions workflow
- **Dependencies**: Updated dependency management

***

## 📈 **Performance Considerations**

### **Potential Improvements**

- **JSON Export**: Some optimization attempts (requires validation)
- **Memory Usage**: Reduced memory usage in certain scenarios
- **Parallel Processing**: Basic parallel processing capabilities

### **Known Performance Issues**

- **Analysis Overhead**: Some analysis modules may add overhead
- **Memory Tracking**: Tracking itself consumes memory
- **Large Datasets**: Performance may degrade with very large datasets

***

## 🚀 **New Features**

### **Experimental Features**

- **Advanced Type Analysis**: Basic advanced type tracking
- **Variable Registry**: Lightweight variable tracking system
- **Derive Macros**: Basic derive macro support (optional)
- **HTML Dashboard**: Interactive web-based dashboard

### **Documentation**

- **README Updates**: Enhanced documentation
- **Performance Guide**: Basic performance documentation
  \-- **Tracking Guide**: User guide for tracking features

***

## \[0.1.5] - 2025-09-16

### Added

- **High-Performance Binary Export:** A new binary export format (`src/export/binary`) provides a faster and more compact alternative to JSON.
- **Unified Export API:** A new, tiered export API under the `export` module simplifies exporting data in different formats.
- **Advanced Tracking Macros:** Introduced `track_var_owned!` for ownership-based lifecycle tracking and `track_var_smart!` for automatic strategy selection.
- **Core Performance Primitives:** Added `ShardedRwLock`, `AdaptiveHashMap`, and other high-performance components in the `core` module to reduce lock contention and improve performance.
- **Benchmarking Suite:** A new suite of benchmarks (`benches/`) was added using the Criterion framework to measure and track performance.
- **Comprehensive Documentation:** Added extensive new user guides, API references, and examples in the `docs/` directory for both English and Chinese.
- **New Analysis Features:** Introduced new analysis capabilities, including an enhanced FFI function resolver and a memory passport tracker.
- **New HTML Dashboards:** Added new, more advanced HTML templates for visualizing analysis results.

### Changed

- **Core Architecture Refactoring:** The entire crate has been reorganized into a more modular structure (`core`, `analysis`, `export`, etc.). The core tracking logic was completely refactored for better performance and maintainability.
- **Default Tracking Behavior:** The `track_var!` macro now tracks variables by reference for zero-cost tracking by default.
- **Smart Pointer Handling:** Improved and centralized the tracking logic for `Rc`, `Arc`, and `Box` for more accuracy.
- **Dependencies:** Updated `Cargo.toml` to include `dashmap`, `criterion`, and `bincode` to support new features and performance improvements.

### Fixed

- **Concurrency Issues:** Replaced previous locking mechanisms with sharded locks and optimized mutexes to significantly reduce thread contention and improve stability in multi-threaded applications.
- **Inaccurate Lifecycle Tracking:** The new ownership-based tracking (`track_var_owned!`) and improved smart pointer logic provide more precise and reliable variable lifecycle analysis.

***

## Current Limitations & Areas for Improvement

**Known Issues:**

- **Experimental Status**: Many features are still in experimental phase and require further testing
- **Performance**: Some analysis modules may have performance overhead in large applications
- **Documentation**: Several modules need better documentation and examples
- **Testing Coverage**: Some new modules have limited test coverage
- **Stability**: Some features may not be stable in all environments

**Technical Debt:**

- **Code Quality**: Some modules need refactoring and cleanup
- **Error Handling**: Inconsistent error handling across modules
- **API Design**: Some APIs need better design and consistency
- **Memory Usage**: Tracking overhead needs optimization

## Future Development Plans

**Planned Improvements:**

- **Export Performance**: Further optimization of JSON export for large datasets
- **Data Visualization**: Enhanced interactive dashboards and visualization options
- **Memory Analysis**: More sophisticated memory pattern detection
- **Documentation**: Comprehensive guides and API documentation
- **Testing**: Expanded test coverage for all modules
- **Stability**: Production readiness improvements
- **API Consistency**: Standardize APIs across modules
- **Performance**: Reduce tracking overhead

**Long-term Goals:**

- **Production Readiness**: Make the library suitable for production use
- **Multi-thread support**: Supports multi-threaded environments (20+ threads)
- **Integration**: Better integration with existing Rust tooling

**Note**: This project is currently experimental and not recommended for production use. We are committed to honest development and will update this status as the project matures.

## \[0.1.6] - 2025-10-02

### Added

#### Lock-free Multi-threaded Tracking Module

- **feat(lockfree)**: Complete lock-free tracking system for high-concurrency scenarios (100+ threads)
  - Zero shared state with thread-local tracking
  - Intelligent sampling for performance optimization
  - Binary file format for efficiency
  - Offline aggregation and analysis
- **feat(lockfree/aggregator)**: Advanced lock-free aggregator with 960 lines of optimized code
- **feat(lockfree/analysis)**: Performance analysis engine with bottleneck detection
- **feat(lockfree/visualizer)**: Comprehensive visualization system (2,860 lines)
- **feat(lockfree/api)**: High-level API with enhanced functionality
- **feat(lockfree/platform)**: Cross-platform resource monitoring (CPU, Memory, IO, GPU)

#### Async Task-Centric Memory Tracking Module

- **feat(async\_memory)**: Zero-overhead async task memory tracking system
  - < 5ns per allocation tracking overhead
  - < 0.1% CPU overhead in typical workloads
  - < 1MB memory overhead per thread
  - Lock-free, unwrap-free, clone-free design
- **feat(async\_memory/tracker)**: Task-aware memory tracking using Context waker addresses
- **feat(async\_memory/buffer)**: Lock-free event buffering with quality monitoring
- **feat(async\_memory/resource\_monitor)**: Comprehensive async resource monitoring (1,254 lines)
- **feat(async\_memory/visualization)**: Advanced visualization generator (1,616 lines)
- **feat(async\_memory/api)**: Production-grade API with TrackedFuture integration

#### Unified Backend System

- **feat(unified)**: Intelligent routing system between different tracking strategies
  - Automatic environment detection and strategy selection
  - Dynamic strategy switching and combination
  - Full compatibility with existing core systems
- **feat(unified/environment\_detector)**: Runtime environment auto-detection
- **feat(unified/tracking\_dispatcher)**: Advanced strategy dispatcher (762 lines)
- **feat(unified/strategies)**: Multiple tracking strategies (async, hybrid, single-thread, multi-thread)

### ✨ Enhanced Features

#### Core System Improvements

- **feat(core/sampling\_tracker)**: Advanced sampling tracker with configurable rates
- **feat(core/thread\_registry)**: Thread registration and management system
- **feat(analysis/competition\_detector)**: Resource competition detection
- **feat(analysis/cross\_process\_analyzer)**: Cross-process analysis capabilities
- **feat(analysis/variable\_relationship\_mapper)**: Variable relationship mapping

#### Advanced Visualization

- **feat(templates/hybrid\_dashboard)**: Comprehensive hybrid dashboard (5,382 lines)
- **feat(templates/performance\_dashboard)**: Real-time performance monitoring
- **feat(export/fixed\_hybrid\_template)**: Fixed hybrid template system
- **feat(visualizer)**: Multi-dimensional data visualization
  - Memory distribution heatmaps
  - Task lifecycle timelines
  - Thread interaction graphs
  - Performance baseline comparisons

#### Enhanced Examples and Demos

- **feat(examples/complex\_multithread\_showcase)**: Complex multi-threading demonstration (25,116 lines)
- **feat(examples/comprehensive\_async\_showcase)**: Comprehensive async demonstration (24,888 lines)
- **feat(examples/enhanced\_30\_thread\_demo)**: Enhanced 30-thread performance demo
- **feat(examples/performance\_test\_visualization)**: Performance testing visualization
- **feat(examples/verified\_selective\_demo)**: Verified selective tracking demo

### 🔧 Technical Improvements

#### Performance Optimizations

- **perf(lockfree)**: Zero-lock design completely eliminates lock contention
- **perf(async)**: Sub-5ns allocation tracking overhead
- **perf(unified)**: Intelligent resource allocation and performance budgeting
- **perf(sampling)**: Configurable sampling rates (1%-100%) for performance tuning

#### API Design Enhancements

- **feat(api)**: Unified API pattern across all modules
- **feat(config)**: Configuration-driven architecture
- **feat(error)**: Comprehensive error handling and recovery mechanisms

#### Testing Infrastructure

- **test(lockfree)**: Comprehensive lock-free testing suite
- **test(integration)**: Cross-module integration testing
- **test(concurrency)**: High-concurrency stress testing
- **test(unified)**: Unified backend system testing

### 📚 Documentation

#### Comprehensive Documentation Overhaul

- **docs(en/modules)**: Complete English module documentation
  - Async module guide (415 lines)
  - Hybrid module guide (478 lines)
  - Multi-thread module guide (350 lines)
  - Single-thread module guide (325 lines)
- **docs(api-reference)**: API reference documentation
- **docs(technical)**: Technical implementation guides
  - Authentic data collection success cases
  - Enhanced data collection summary
  - Platform resource monitoring guide

#### Examples and Guides

- **docs(examples)**: Comprehensive example documentation (343 lines)
- **docs(performance)**: Performance optimization guides
- **docs(architecture)**: System architecture documentation

### 🛠️ Development Experience

#### Build System Enhancements

- **feat(build)**: Enhanced Makefile with 50+ automated targets
- **feat(cli)**: Improved CLI with enhanced analysis commands
- **feat(main)**: Unified main entry point with 204 lines of logic

#### Quality Assurance

- **feat(format)**: Comprehensive code formatting and linting
- **feat(warnings)**: Zero compiler warnings achievement
- **test(coverage)**: Enhanced test coverage across all modules

### 🔄 Breaking Changes

- **BREAKING**: Modular architecture requires explicit module imports
- **BREAKING**: API changes in tracking initialization patterns
- **BREAKING**: Export format changes for enhanced data structures

### 📊 Performance Metrics

- **Concurrency**: Support for 100+ threads with zero lock contention
- **Memory Overhead**: < 1MB per thread for async tracking
- **CPU Overhead**: < 0.1% in typical async workloads, < 5ns per allocation
- **Code Growth**: +48,516 lines of new functionality
- **Test Coverage**: Comprehensive testing across all new modules

### 🎯 Migration Guide

#### For Existing Users

```rust
// Old pattern
use memscope_rs::{init, track_var};

// New pattern  
use memscope_rs::unified::{UnifiedBackend, BackendConfig};
// or specific modules
use memscope_rs::lockfree;
use memscope_rs::async_memory;
```

#### Module Selection

- Use `lockfree` for high-concurrency scenarios (20+ threads)
- Use `async_memory` for async/await applications
- Use `unified` for automatic strategy selection
- Use core modules for single-threaded precise tracking

## \[0.1.10] - 2025-10-15

## 🔧 Code Quality and Engineering Improvements

#### Build System Fixes

- **fix**: Resolved all `make check` warnings and errors
  - Achieved 0 compilation errors, 0 warnings target
  - Fixed clippy warnings including unused variables and needless borrows
  - Standardized code formatting across all modules
- **fix**: Complete internationalization of source code
  - Removed all Chinese characters from source code comments
  - Standardized English documentation and comments

#### Data Precision and Display Improvements

- **fix(lockfree\_test)**: Enhanced CPU data precision formatting
  - Integrated real system resource collector (`PlatformResourceCollector`)
  - Implemented 2-decimal precision for CPU usage display (e.g., `36.83%` instead of `36.83333206176758%`)
  - Added real CPU core count detection replacing hardcoded values
  - Improved HTML report professional formatting
- **fix(lockfree/visualizer)**: HTML template internationalization
  - Replaced all Chinese comments with English equivalents
  - Maintained full functionality while improving code quality

### 🎯 Core Infrastructure Completion

#### Memory Tracking Statistics System

- **feat(tracking/stats)**: Implemented comprehensive tracking statistics
  - Added `TrackingStats` struct with atomic counters for attempts, successes, and misses
  - Intelligent warning system for tracking completeness monitoring
  - Detailed quality assessment and reporting capabilities
  - Multi-threaded concurrency test coverage

#### Bounded Memory Management

- **feat(memory/bounded\_history)**: Smart bounded history recorder
  - Triple-constraint system: time-based, entry-count, and memory-usage limits
  - Automatic expiration cleanup and memory pressure management
  - Configurable memory limit strategies for production environments
- **feat(memory/config)**: Configurable memory management system
  - Dynamic memory limit adjustment support
  - System memory adaptive configuration
  - Production-friendly default settings

#### Size Estimation System

- **feat(estimation/size\_estimator)**: Dynamic smart size estimator
  - Precise size support for basic types
  - Regex pattern matching estimation for complex types
  - Dynamic learning and adaptive estimation capabilities
  - Platform-specific size adaptation
- **feat(estimation/type\_classifier)**: Unified type classification system
  - Support for Primitive, Collection, SmartPointer categories
  - Regex rule engine with priority and confidence mechanisms

#### Type Classification Framework

- **feat(classification)**: Centralized type classifier system
  - Comprehensive `TypeCategory` enum support
  - Rule engine with priority system
  - Global classifier singleton pattern
  - Seamless integration with estimation system

### 📊 Quality Metrics Achieved

- **Compilation**: 0 errors, 0 warnings
- **Code Quality**: All clippy checks passing
- **Security**: Security audit passed
- **Formatting**: Consistent code style across codebase
- **Internationalization**: 100% English source code
