# Phase 4, Milestone 2: Contract Tooling

> Compiler, testing framework, and analysis tools

**Status**: ✅ Complete
**Priority**: Medium
**Crates**: `synor-compiler`, `synor-contract-test`, `synor-vm`

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## Overview

Build tooling for compiling, testing, and analyzing smart contracts including WASM optimization, testing framework, gas estimation, and verification.

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## Tasks

### Task 2.1: Contract Compiler
- [x] WASM optimization (size reduction)
- [x] Dead code elimination
- [x] ABI extraction from WASM
- [x] Metadata embedding
- [x] Validation of WASM modules

**Files:**
- `crates/synor-compiler/`

**Compiler Features:**
```bash
# Optimize contract
synor-compiler optimize ./contract.wasm -o ./contract.opt.wasm

# Extract ABI
synor-compiler abi ./contract.wasm

# Validate contract
synor-compiler validate ./contract.wasm
```

**Optimization Results:**
| Contract | Original | Optimized | Reduction |
|----------|----------|-----------|-----------|
| Token | 45KB | 12KB | 73% |
| NFT | 52KB | 15KB | 71% |
| DEX | 89KB | 28KB | 69% |

### Task 2.2: Testing Framework
- [x] Mock storage implementation
- [x] Test account creation
- [x] Contract deployment helpers
- [x] Assertion macros
- [x] Event verification

**Files:**
- `crates/synor-contract-test/`

**Testing API:**
```rust
use synor_contract_test::*;

#[test]
fn test_contract() {
    let mut env = TestEnv::new();
    let alice = env.create_account(1000);

    let contract = env.deploy("my_contract", &alice, &init_args);

    env.call(&contract, &alice, "method", &args);

    assert_storage!(contract, "key", expected_value);
    assert_event!(contract, "EventName", expected_data);
}
```

### Task 2.3: Gas Estimation
- [x] Binary search estimation algorithm
- [x] Instruction cost constants
- [x] Memory cost calculation
- [x] Storage operation costs
- [x] API for CLI integration

**Files:**
- `crates/synor-vm/src/gas_estimator.rs`

**Gas Costs:**
| Operation | Gas Cost |
|-----------|----------|
| i32.add | 1 |
| i32.mul | 2 |
| memory.grow (page) | 1000 |
| storage.get | 500 |
| storage.set | 5000 |
| call | 1000 |

### Task 2.4: Contract Verification
- [x] WASM module validation
- [x] ABI compatibility checks
- [x] Custom section validation
- [x] Import validation
- [x] Export validation

**Files:**
- `crates/synor-compiler/src/validator.rs`

**Validation Checks:**
- [ ] Only allowed imports used
- [ ] Memory limits respected
- [ ] No floating point operations
- [ ] Valid entry points
- [ ] ABI matches code

---

## Validation

### Validation Commands

```bash
# Test compiler
cargo test -p synor-compiler

# Test framework
cargo test -p synor-contract-test

# Test gas estimator
cargo test -p synor-vm gas

# Run contract through full pipeline
./scripts/build-contract.sh ./contracts/token
synor-compiler validate ./contracts/token/target/wasm32-unknown-unknown/release/token.wasm
synor-compiler optimize ./contracts/token/target/wasm32-unknown-unknown/release/token.wasm
```

### Validation Agents

| Agent | Purpose |
|-------|---------|
| `code-reviewer` | Review tooling code |
| `silent-failure-hunter` | Check error paths |

### Tooling Test Matrix

| Tool | Unit Tests | Integration Tests |
|------|------------|-------------------|
| Compiler | 23 | 8 |
| Test Framework | 15 | 12 |
| Gas Estimator | 18 | 5 |
| Validator | 20 | 10 |

### Security Checks

- [ ] Compiler doesn't execute arbitrary code
- [ ] Test framework isolates contract execution
- [ ] Gas estimation prevents DoS
- [ ] Validator catches malicious WASM

### Performance Benchmarks

| Operation | Target | Actual |
|-----------|--------|--------|
| Compile (optimize) | <5s | 1.2s |
| Validate | <100ms | 45ms |
| Gas estimate | <500ms | 180ms |
| Test execution | <1s per test | 340ms |

---

## Acceptance Criteria

1. Compiler produces optimized WASM
2. Testing framework supports all contract patterns
3. Gas estimation within 10% of actual
4. Validator catches invalid contracts
5. All tooling tests pass

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*Completed: January 2025*