Mergen/lifter/core/Utils.cpp

#include "Utils.h"
#include "llvm/IR/Value.h"
#include <chrono>
#include <iostream>
#include <sstream>
#include <llvm/Analysis/ValueLattice.h>
#include <llvm/Support/KnownBits.h>
#include <map>
#include <utility>
// #include <z3++.h>

/*


float intBitsToFloat(int bits) {
    // Extract components from the int using IEEE 754 single precision format
    int sign = (bits >> 31) & 0x1;
    int exponent = (bits >> 23) & 0xFF;
    int mantissa = bits & 0x7FFFFF;

    // Build float value according to IEEE 754 formula
    float value = 0;
    if (exponent == 0) {
        if (mantissa == 0) {
            value = sign ? -0.0f : 0.0f;
        } else {
            // Denormalized number
            value = (sign ? -1.0f : 1.0f) * (mantissa / (float)(1 << 23)) *
powf(2.0f, -126);
        }
    } else if (exponent == 0xFF) {
        if (mantissa == 0) {
            value = sign ? -INFINITY : INFINITY;
        } else {
            value = NAN;
        }
    } else {
        // Normalized number
        value = (sign ? -1.0f : 1.0f) * (1.0f + mantissa / (float)(1 << 23)) *
powf(2.0f, exponent - 127);
    }

    return value;
}
int floatBitsToInt(float f) {
    if (f == 0.0f) {
        return (std::signbit(f) ? 0x80000000 : 0);
    }

    if (std::isinf(f)) {
        return (f < 0 ? 0xFF800000 : 0x7F800000);
    }

    if (std::isnan(f)) {
        return 0x7FC00000;  // One common NaN pattern
    }

    int sign = std::signbit(f) ? 1 : 0;
    float abs_f = std::fabs(f);

    int exponent = std::ilogbf(abs_f) + 127;  // Get biased exponent

    // Handle denormals
    if (exponent <= 0) {
        float mantissa_f = abs_f * powf(2.0f, 149);  // 126 + 23
        int mantissa = (int)mantissa_f;
        return (sign << 31) | mantissa;
    }

    // Extract mantissa (23 bits of precision)
    float mantissa_f = (abs_f / powf(2.0f, std::ilogbf(abs_f)) - 1.0f) *
(float)(1 << 23); int mantissa = (int)mantissa_f;

    return (sign << 31) | (exponent << 23) | mantissa;
}

*/

namespace debugging {
  int ic = 1;
  int increaseInstCounter() { return ++ic; }
  bool shouldDebug = false;
  llvm::raw_ostream* debugStream = nullptr;
  std::unique_ptr<llvm::raw_fd_ostream> fileStream;

  void enableDebug(const std::string& filename = "") {
    shouldDebug = true;
    if (!filename.empty()) {
      std::error_code EC;
      fileStream = std::make_unique<llvm::raw_fd_ostream>(filename, EC);
      if (EC) {
        llvm::errs() << "Error opening debug file: " << EC.message() << "\n";
        fileStream.reset();
        debugStream = &llvm::errs();
        shouldDebug = false;
        return;
      }
      debugStream = fileStream.get();
    } else {
      debugStream = &llvm::outs();
    }
    llvm::outs() << "Debugging enabled\n";
  }

  // Other functions remain the same, but use debugStream instead of
  // llvm::outs() For example:

  void doIfDebug(const std::function<void(void)>& dothis) {
    if (!shouldDebug)
      return;
    (dothis)();
  }

} // namespace debugging

namespace argparser {
namespace {
bool isOptionToken(const std::string& arg) {
  return !arg.empty() && arg.front() == '-';
}
} // namespace

void printHelp() {
  std::cerr << "Options:\n"
            << "  -d, --enable-debug        Enable debugging mode\n"
            << "  -h, --help                Display this help message\n"
            << "  --concretize-unsafe-reads Concretizes potentially unsafe "
               "reads to writable sections\n"
            << "  --outline <addrs>         Comma-separated addresses to outline (not inline)\n"
            << "  --                        Stop option parsing\n";
}

ParseResult parseArguments(const std::vector<std::string>& args,
                           bool allowUnknownOptions) {
  ParseResult result;
  if (args.empty()) {
    return result;
  }

  result.positionalArgs.reserve(args.size());
  result.positionalArgs.push_back(args.front());

  bool parsingOptions = true;
  for (size_t index = 1; index < args.size(); ++index) {
    const auto& arg = args[index];

    if (parsingOptions && arg == "--") {
      parsingOptions = false;
      continue;
    }

    if (parsingOptions) {
      if (arg == "-h" || arg == "--help") {
        result.showHelp = true;
        continue;
      }
      if (arg == "-d" || arg == "--enable-debug") {
        result.enableDebug = true;
        continue;
      }
      if (arg == "--concretize-unsafe-reads") {
        result.concretizeUnsafeReads = true;
        continue;
      }
      if (arg == "--outline" || arg.rfind("--outline=", 0) == 0) {
        std::string value;
        if (arg.rfind("--outline=", 0) == 0) {
          value = arg.substr(10);
          if (value.empty()) {
            result.errors.push_back("--outline= requires a value after '='");
            continue;
          }
        } else if (index + 1 < args.size()) {
          value = args[++index];
        } else {
          result.errors.push_back("--outline requires an argument");
          continue;
        }
        std::istringstream stream(value);
        std::string token;
        while (std::getline(stream, token, ',')) {
          if (token.empty()) continue;
          try {
            result.outlineAddresses.push_back(std::stoull(token, nullptr, 0));
          } catch (const std::exception&) {
            result.errors.push_back("Invalid outline address: " + token);
          }
        }
        continue;
      }

      if (isOptionToken(arg)) {
        if (allowUnknownOptions) {
          result.positionalArgs.push_back(arg);
        } else {
          result.errors.push_back("Unknown option: " + arg);
        }
        continue;
      }
    }

    result.positionalArgs.push_back(arg);
  }

  return result;
}

} // namespace argparser

namespace timer {
  using clock = std::chrono::high_resolution_clock;
  using time_point = std::chrono::time_point<clock>;
  using duration = std::chrono::duration<double, std::milli>;

  time_point startTime;
  bool running = false;

  void startTimer() {
    startTime = clock::now();
    running = true;
  }

  double getTimer() {
    if (running) {
      return std::chrono::duration_cast<duration>(clock::now() - startTime)
          .count();
    }
    return 0.0;
  }

  double stopTimer() {
    if (running) {
      running = false;
      return std::chrono::duration_cast<duration>(clock::now() - startTime)
          .count();
    }
    return 0.0;
  }

  void resetTimer() {
    startTime = clock::now();
    running = true;
  }
} // namespace timer