SMT Integration

/**
 * Create SMT solver callback for compilation
 * @param solverFunction - Function that takes SMT queries and returns solutions
 * @param solver - Optional solver configuration object
 * @returns Callback function compatible with compile() method
 */
function smtCallback(
  solverFunction: (query: string, solver?: any) => string,
  solver?: any
): (query: string) => { contents: string } | { error: string };

import solc from "solc";
import smtchecker from "solc/smtchecker";
import smtsolver from "solc/smtsolver";

const input = {
  language: 'Solidity',
  sources: {
    'test.sol': {
      content: 'contract C { function f(uint x) public { assert(x > 0); } }'
    }
  },
  settings: {
    modelChecker: {
      engine: "chc",
      solvers: ["smtlib2"]
    }
  }
};

// Create SMT callback
const callback = smtchecker.smtCallback(
  smtsolver.smtSolver,
  smtsolver.availableSolvers[0]
);

// Compile with SMT verification
const output = JSON.parse(
  solc.compile(JSON.stringify(input), { smtSolver: callback })
);

/**
 * Handle SMT queries from compiler output
 * @param inputJSON - Original Standard JSON input object
 * @param outputJSON - Standard JSON output containing SMT queries
 * @param solverFunction - Function to solve individual SMT queries
 * @param solver - Optional solver configuration
 * @returns Modified input JSON with SMT responses, or null if no queries
 */
function handleSMTQueries(
  inputJSON: any,
  outputJSON: any,
  solverFunction: (query: string, solver?: any) => string,
  solver?: any
): any | null;

import smtchecker from "solc/smtchecker";
import smtsolver from "solc/smtsolver";

// First compilation to get SMT queries
const input = { /* standard JSON input with modelChecker settings */ };
const firstOutput = JSON.parse(solc.compile(JSON.stringify(input)));

// Process SMT queries if present
const modifiedInput = smtchecker.handleSMTQueries(
  input,
  firstOutput,
  smtsolver.smtSolver,
  smtsolver.availableSolvers[0]
);

if (modifiedInput) {
  // Re-compile with SMT solutions
  const finalOutput = JSON.parse(solc.compile(JSON.stringify(modifiedInput)));
  console.log('SMT verification results:', finalOutput.errors);
} else {
  console.log('No SMT queries to process');
}

/**
 * Solve an individual SMT query using available solvers
 * @param query - SMT-LIB2 formatted query string
 * @param solver - Optional solver configuration (uses first available if not specified)
 * @returns Solver output string (sat/unsat/unknown with optional model)
 */
function smtSolver(query: string, solver?: SolverConfig): string;

interface SolverConfig {
  name: string;
  command: string;
  params: string;
}

/** Array of locally available SMT solvers detected at runtime */
const availableSolvers: SolverConfig[];

import smtsolver from "solc/smtsolver";

// Check available solvers
console.log('Available solvers:', smtsolver.availableSolvers);

if (smtsolver.availableSolvers.length === 0) {
  console.log('No SMT solvers found. Install Z3, Eldarica, or cvc5.');
} else {
  // Use first available solver
  const query = `(set-logic QF_LIA)
(declare-fun x () Int)
(assert (> x 0))
(check-sat)
(get-model)`;

  try {
    const result = smtsolver.smtSolver(query);
    console.log('Solver result:', result); // "sat" or "unsat" etc.
  } catch (error) {
    console.error('Solver error:', error.message);
  }
}

interface ModelCheckerSettings {
  /** Verification engine to use */
  engine: "chc" | "bmc";
  /** SMT solvers to use (defaults to ["smtlib2"]) */
  solvers?: string[];
  /** Timeout in milliseconds */
  timeout?: number;
  /** Verification targets */
  targets?: ("assert" | "underflow" | "overflow" | "divByZero" | "constantCondition" | "popEmptyArray" | "outOfBounds")[];
}

// Basic assertion checking
const basicConfig = {
  language: 'Solidity',
  sources: { /* ... */ },
  settings: {
    modelChecker: {
      engine: "chc",
      solvers: ["smtlib2"]
    }
  }
};

// Advanced configuration
const advancedConfig = {
  language: 'Solidity',
  sources: { /* ... */ },
  settings: {
    modelChecker: {
      engine: "bmc",
      solvers: ["smtlib2"],
      timeout: 30000,
      targets: ["assert", "overflow", "underflow"]
    }
  }
};

import smtsolver from "solc/smtsolver";

try {
  const result = smtsolver.smtSolver(complexQuery);
  
  if (result.startsWith('sat')) {
    console.log('Query is satisfiable');
  } else if (result.startsWith('unsat')) {
    console.log('Query is unsatisfiable');
  } else if (result.startsWith('unknown')) {
    console.log('Solver could not determine satisfiability');
  }
} catch (error) {
  console.error('SMT solver failed:', error.message);
  // Continue without SMT verification
}

import solc from "solc";
import smtchecker from "solc/smtchecker";
import smtsolver from "solc/smtsolver";

async function verifyContract(sourceCode: string) {
  const input = {
    language: 'Solidity',
    sources: {
      'contract.sol': { content: sourceCode }
    },
    settings: {
      modelChecker: {
        engine: "chc",
        solvers: ["smtlib2"]
      },
      outputSelection: {
        '*': { '*': ['*'] }
      }
    }
  };

  try {
    // First compilation
    const output = JSON.parse(solc.compile(JSON.stringify(input)));
    
    if (smtsolver.availableSolvers.length === 0) {
      console.log('No SMT solvers available - skipping verification');
      return output;
    }

    // Handle SMT queries
    const modifiedInput = smtchecker.handleSMTQueries(
      input,
      output,
      smtsolver.smtSolver,
      smtsolver.availableSolvers[0]
    );

    if (modifiedInput) {
      console.log('Re-running compilation with SMT solutions...');
      const finalOutput = JSON.parse(solc.compile(JSON.stringify(modifiedInput)));
      return finalOutput;
    }

    return output;
    
  } catch (error) {
    console.error('Verification failed:', error);
    throw error;
  }
}

// Usage
const contractCode = `
contract SafeMath {
  function add(uint a, uint b) public pure returns (uint) {
    uint c = a + b;
    assert(c >= a); // This assertion will be verified
    return c;
  }
}`;

verifyContract(contractCode).then(result => {
  const errors = result.errors || [];
  const warnings = errors.filter(e => e.severity === 'warning');
  const errorMessages = errors.filter(e => e.severity === 'error');
  
  console.log(`Verification complete: ${errorMessages.length} errors, ${warnings.length} warnings`);
});