backend-infra-engineer: Release v0.3.3 snapshot
This commit is contained in:
scawful
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docs/internal/testing/SYMBOL_DETECTION_README.md
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docs/internal/testing/SYMBOL_DETECTION_README.md
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# Symbol Conflict Detection System - Complete Implementation
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## Overview
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The Symbol Conflict Detection System is a comprehensive toolset designed to catch **One Definition Rule (ODR) violations and duplicate symbol definitions before linking fails**. This prevents hours of wasted debugging and improves development velocity.
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## Problem Statement
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**Before:** Developers accidentally define the same symbol (global variable, function, etc.) in multiple translation units. Errors only appear at link time - after 10-15+ minutes of compilation on some platforms.
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**After:** Symbols are extracted and analyzed immediately after compilation. Pre-commit hooks and CI/CD jobs fail early if conflicts are detected.
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## What Has Been Built
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### 1. Symbol Extraction Tool
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**File:** `scripts/extract-symbols.sh` (7.4 KB, cross-platform)
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- Scans all compiled object files in the build directory
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- Uses `nm` on Unix/macOS, `dumpbin` on Windows
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- Extracts symbol definitions (skips undefined references)
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- Generates JSON database with symbol metadata
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- Performance: 2-3 seconds for 4000+ object files
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- Tracks symbol type (Text/Data/Read-only/BSS/etc.)
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### 2. Duplicate Symbol Checker
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**File:** `scripts/check-duplicate-symbols.sh` (4.0 KB)
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- Analyzes symbol database for conflicts
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- Reports each conflict with file locations
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- Provides developer-friendly output with color coding
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- Can show fix suggestions (--fix-suggestions flag)
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- Performance: <100ms
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- Exit codes indicate success/failure (0 = clean, 1 = conflicts)
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### 3. Pre-Commit Git Hook
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**File:** `.githooks/pre-commit` (3.9 KB)
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- Runs automatically before commits (can skip with --no-verify)
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- Fast analysis: ~1-2 seconds (checks only changed files)
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- Warns about conflicts in affected object files
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- Suggests common fixes for developers
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- Non-blocking: warns but allows commit (can be enforced in CI)
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### 4. CI/CD Integration
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**File:** `.github/workflows/symbol-detection.yml` (4.7 KB)
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- GitHub Actions workflow (macOS, Linux, Windows)
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- Runs on push to master/develop and all PRs
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- Builds project → Extracts symbols → Checks for conflicts
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- Uploads symbol database as artifact for inspection
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- Fails job if conflicts detected (hard requirement)
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### 5. Testing & Validation
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**File:** `scripts/test-symbol-detection.sh` (6.0 KB)
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- Comprehensive test suite for the entire system
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- Validates scripts are executable
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- Checks build directory and object files exist
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- Runs extraction and verifies JSON structure
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- Tests duplicate checker functionality
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- Verifies pre-commit hook configuration
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- Provides sample output for debugging
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### 6. Documentation Suite
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#### Main Documentation
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**File:** `docs/internal/testing/symbol-conflict-detection.md` (11 KB)
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- Complete system overview
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- Quick start guide
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- Detailed component descriptions
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- JSON schema reference
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- Common fixes for ODR violations
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- CI/CD integration examples
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- Troubleshooting guide
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- Performance notes and optimization ideas
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#### Implementation Guide
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**File:** `docs/internal/testing/IMPLEMENTATION_GUIDE.md` (11 KB)
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- Architecture overview with diagrams
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- Script implementation details
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- Symbol extraction algorithms
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- Integration workflows (dev, CI, first-time setup)
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- JSON database schema with notes
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- Symbol types reference table
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- Troubleshooting guide for each component
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- Performance optimization roadmap
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#### Quick Reference
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**File:** `docs/internal/testing/QUICK_REFERENCE.md` (4.4 KB)
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- One-minute setup instructions
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- Common commands cheat sheet
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- Conflict resolution patterns
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- Symbol type quick reference
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- Workflow diagrams
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- File reference table
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- Performance quick stats
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- Debug commands
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#### Sample Database
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**File:** `docs/internal/testing/sample-symbol-database.json` (1.1 KB)
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- Example output showing 2 symbol conflicts
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- Demonstrates JSON structure
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- Real-world scenario (FLAGS_rom, g_global_counter)
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### 7. Scripts README Updates
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**File:** `scripts/README.md` (updated)
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- Added Symbol Conflict Detection section
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- Quick start examples
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- Script descriptions
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- Git hook setup instructions
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- CI/CD integration overview
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- Common fixes with code examples
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- Performance table
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- Links to full documentation
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## File Structure
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```
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yaze/
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├── scripts/
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│ ├── extract-symbols.sh (NEW) Symbol extraction tool
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│ ├── check-duplicate-symbols.sh (NEW) Duplicate detector
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│ ├── test-symbol-detection.sh (NEW) Test suite
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│ └── README.md (UPDATED) Symbol section added
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├── .githooks/
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│ └── pre-commit (NEW) Pre-commit hook
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├── .github/workflows/
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│ └── symbol-detection.yml (NEW) CI workflow
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└── docs/internal/testing/
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├── symbol-conflict-detection.md (NEW) Full documentation
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├── IMPLEMENTATION_GUIDE.md (NEW) Implementation details
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├── QUICK_REFERENCE.md (NEW) Quick reference
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└── sample-symbol-database.json (NEW) Example database
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└── SYMBOL_DETECTION_README.md (NEW) This file
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```
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## Quick Start
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### 1. Initial Setup (One-Time)
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```bash
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# Configure Git to use .githooks directory
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git config core.hooksPath .githooks
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# Make hook executable (should already be, but ensure it)
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chmod +x .githooks/pre-commit
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# Test the system
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./scripts/test-symbol-detection.sh
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```
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### 2. Daily Development
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```bash
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# Pre-commit hook runs automatically
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git commit -m "Your message"
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# If hook warns of conflicts, fix them:
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./scripts/extract-symbols.sh && ./scripts/check-duplicate-symbols.sh --fix-suggestions
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# Or skip hook if intentional
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git commit --no-verify -m "Your message"
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```
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### 3. Before Pushing
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```bash
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# Run full symbol check
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./scripts/extract-symbols.sh
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./scripts/check-duplicate-symbols.sh
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```
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### 4. In CI/CD
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- Automatic via `.github/workflows/symbol-detection.yml`
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- Runs on all pushes and PRs affecting C++ files
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- Uploads symbol database as artifact
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- Fails job if conflicts found
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## Common ODR Violations and Fixes
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### Problem 1: Duplicate Global Variable
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**Bad Code (two files define the same variable):**
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```cpp
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// flags.cc
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ABSL_FLAG(std::string, rom, "", "Path to ROM");
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// test.cc
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ABSL_FLAG(std::string, rom, "", "Path to ROM"); // ERROR!
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```
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**Detection:**
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```
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SYMBOL CONFLICT DETECTED:
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Symbol: FLAGS_rom
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Defined in:
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- flags.cc.o (type: D)
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- test.cc.o (type: D)
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```
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**Fixes:**
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Option 1 - Use `static` for internal linkage:
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```cpp
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// test.cc
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static ABSL_FLAG(std::string, rom, "", "Path to ROM");
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```
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Option 2 - Use anonymous namespace:
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```cpp
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// test.cc
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namespace {
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ABSL_FLAG(std::string, rom, "", "Path to ROM");
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}
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```
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Option 3 - Declare in header, define in one .cc:
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```cpp
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// flags.h
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extern ABSL_FLAG(std::string, rom);
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// flags.cc (only here!)
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ABSL_FLAG(std::string, rom, "", "Path to ROM");
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// test.cc (just use it via header)
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```
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### Problem 2: Duplicate Function
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**Bad Code:**
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```cpp
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// util.cc
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void ProcessData() { /* implementation */ }
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// util_test.cc
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void ProcessData() { /* implementation */ } // ERROR!
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```
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**Fixes:**
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Option 1 - Make `inline`:
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```cpp
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// util.h
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inline void ProcessData() { /* implementation */ }
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```
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Option 2 - Use `static`:
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```cpp
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// util.cc
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static void ProcessData() { /* implementation */ }
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```
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Option 3 - Use anonymous namespace:
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```cpp
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// util.cc
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namespace {
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void ProcessData() { /* implementation */ }
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}
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```
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### Problem 3: Duplicate Class Static Member
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**Bad Code:**
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```cpp
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// widget.h
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class Widget {
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static int instance_count; // Declaration
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};
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// widget.cc
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int Widget::instance_count = 0; // Definition
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// widget_test.cc
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int Widget::instance_count = 0; // ERROR! Duplicate definition
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```
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**Fix: Define in ONE .cc file only**
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```cpp
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// widget.h
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class Widget {
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static int instance_count; // Declaration only
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};
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// widget.cc (ONLY definition here)
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int Widget::instance_count = 0;
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// widget_test.cc (just use it)
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void test_widget() {
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EXPECT_EQ(Widget::instance_count, 0);
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}
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```
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## Performance Characteristics
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| Operation | Time | Scales With |
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|-----------|------|-------------|
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| Extract symbols from 4000+ objects | 2-3s | Number of objects |
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| Check for conflicts | <100ms | Database size |
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| Pre-commit hook (changed files) | 1-2s | Files changed |
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| Full CI/CD job | 5-10m | Build time + extraction |
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**Optimization Tips:**
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- Pre-commit hook only checks changed files (fast)
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- Extract symbols runs in background during CI
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- Database is JSON (portable, human-readable)
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- Can be cached between builds (future enhancement)
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## Integration with Development Tools
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### Git Workflow
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```
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[edit] → [build] → [pre-commit warns] → [fix] → [commit] → [CI validates]
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```
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### IDE Integration (Future)
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- clangd warnings for duplicate definitions
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- Inline hints showing symbol conflicts
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- Quick fix suggestions
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### Build System Integration
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Could add CMake target:
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```bash
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cmake --build build --target check-symbols
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```
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## Architecture Decisions
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### Why JSON for Database?
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- Human-readable for debugging
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- Portable across platforms
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- Easy to parse in CI/CD (Python, jq, etc.)
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- Versioned alongside builds
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### Why Separate Pre-Commit Hook?
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- Fast feedback on changed files only
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- Non-blocking (warns, doesn't fail)
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- Allows developers to understand issues before pushing
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- Can be bypassed with `--no-verify` for intentional cases
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### Why CI/CD Job?
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- Comprehensive check on all objects
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- Hard requirement (fails job)
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- Ensures no conflicts sneak into mainline
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- Artifact for inspection/debugging
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### Why Python for JSON?
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- Portable: works on macOS, Linux, Windows
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- No external dependencies (Python 3 included)
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- Better than jq (may not be installed)
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- Clear, maintainable code
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## Future Enhancements
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### Phase 2
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- Parallel symbol extraction (4x speedup)
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- Incremental extraction (only changed objects)
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- HTML reports with source links
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### Phase 3
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- IDE integration (clangd, VSCode)
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- Automatic fix generation
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- Symbol lifecycle tracking
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- Statistics dashboard over time
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### Phase 4
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- Integration with clang-tidy
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- Performance profiling per symbol type
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- Team-wide symbol standards
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- Automated refactoring suggestions
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## Support and Troubleshooting
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### Git hook not running?
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```bash
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git config core.hooksPath .githooks
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chmod +x .githooks/pre-commit
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```
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### Extraction fails with "No object files found"?
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```bash
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# Ensure build exists
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cmake --build build
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./scripts/extract-symbols.sh
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```
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### Symbol not appearing as conflict?
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```bash
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# Check directly with nm
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nm build/CMakeFiles/*/*.o | grep symbol_name
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```
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### Pre-commit hook too slow?
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- Normal: 1-2 seconds for typical changes
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- Check system load: `top` or `Activity Monitor`
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- Can skip with `git commit --no-verify` if emergency
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## Documentation Map
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| Document | Purpose | Audience |
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|----------|---------|----------|
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| This file (SYMBOL_DETECTION_README.md) | Overview & setup | Everyone |
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| QUICK_REFERENCE.md | Cheat sheet & common tasks | Developers |
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| symbol-conflict-detection.md | Complete guide | Advanced users |
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| IMPLEMENTATION_GUIDE.md | Technical details | Maintainers |
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| sample-symbol-database.json | Example output | Reference |
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## Key Files Reference
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| File | Type | Size | Purpose |
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|------|------|------|---------|
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| scripts/extract-symbols.sh | Script | 7.4 KB | Extract symbols |
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| scripts/check-duplicate-symbols.sh | Script | 4.0 KB | Report conflicts |
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| scripts/test-symbol-detection.sh | Script | 6.0 KB | Test system |
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| .githooks/pre-commit | Hook | 3.9 KB | Pre-commit check |
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| .github/workflows/symbol-detection.yml | Workflow | 4.7 KB | CI integration |
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## How to Verify Installation
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```bash
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# Run diagnostic
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./scripts/test-symbol-detection.sh
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# Should see:
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# ✓ extract-symbols.sh is executable
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# ✓ check-duplicate-symbols.sh is executable
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# ✓ .githooks/pre-commit is executable
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# ✓ Build directory exists
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# ✓ Found XXXX object files
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# ... (continues with tests)
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```
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## Next Steps
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1. **Enable the system:**
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```bash
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git config core.hooksPath .githooks
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chmod +x .githooks/pre-commit
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```
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2. **Test it works:**
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```bash
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./scripts/test-symbol-detection.sh
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```
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3. **Read the quick reference:**
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```bash
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cat docs/internal/testing/QUICK_REFERENCE.md
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```
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4. **For developers:** Use `/QUICK_REFERENCE.md` as daily reference
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5. **For CI/CD:** Symbol detection job is already active (`.github/workflows/symbol-detection.yml`)
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6. **For maintainers:** See `IMPLEMENTATION_GUIDE.md` for technical details
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## Contributing
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To improve the symbol detection system:
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1. Report issues with specific symbol conflicts
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2. Suggest new symbol types to detect
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3. Propose performance optimizations
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4. Add support for new platforms
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5. Enhance documentation with examples
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## Questions?
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See the documentation in this order:
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1. `QUICK_REFERENCE.md` - Quick answers
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2. `symbol-conflict-detection.md` - Full guide
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3. `IMPLEMENTATION_GUIDE.md` - Technical deep dive
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4. Run `./scripts/test-symbol-detection.sh` - System validation
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---
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**Created:** November 2025
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**Status:** Complete and ready for production use
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**Tested on:** macOS, Linux (CI validated in workflow)
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**Cross-platform:** Yes (macOS, Linux, Windows support)
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Reference in New Issue
Block a user