expr2java.h

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/*******************************************************************\
 
Module:
 
Author: Daniel Kroening, kroening@cs.cmu.edu
 
\*******************************************************************/
 
 
#ifndef CPROVER_JAVA_BYTECODE_EXPR2JAVA_H
#define CPROVER_JAVA_BYTECODE_EXPR2JAVA_H
 
#include <cmath>
#include <sstream>
#include <string>
 
#include <ansi-c/expr2c_class.h>
 
class expr2javat:public expr2ct
{
public:
  explicit expr2javat(const namespacet &_ns):expr2ct(_ns) { }
  virtual std::string convert(const typet &src) override;
  virtual std::string convert(const exprt &src) override;
 
protected:
  virtual std::string convert_with_precedence(
    const exprt &src, unsigned &precedence) override;
  std::string convert_java_this();
  std::string convert_java_instanceof(const exprt &src);
  std::string convert_java_new(const exprt &src);
  std::string convert_code_java_new(const exprt &src, unsigned precedence);
  std::string convert_code_java_delete(const exprt &src, unsigned precedence);
  virtual std::string convert_struct(
    const exprt &src, unsigned &precedence) override;
  virtual std::string convert_code(const codet &src, unsigned indent) override;
  virtual std::string convert_constant(
    const constant_exprt &src, unsigned &precedence) override;
  // Hides base class version
  std::string convert_code_function_call(
    const code_function_callt &src, unsigned indent);
 
  virtual std::string convert_rec(
    const typet &src,
    const qualifierst &qualifiers,
    const std::string &declarator) override;
 
  // length of string representation of Java Char
  // representation is '\u0000'
  const std::size_t char_representation_length=8;
};
 
std::string expr2java(const exprt &expr, const namespacet &ns);
std::string type2java(const typet &type, const namespacet &ns);
 
template <typename float_type>
std::string floating_point_to_java_string(float_type value)
{
  const bool is_float = std::is_same<float_type, float>::value;
  const std::string class_name = is_float ? "Float" : "Double";
  if(std::isnan(value))
    return class_name + ".NaN";
  if(std::isinf(value) && value >= 0.)
    return class_name + ".POSITIVE_INFINITY";
  if(std::isinf(value) && value <= 0.)
    return class_name + ".NEGATIVE_INFINITY";
  const std::string decimal = [&]() -> std::string {
    // Using ostringstream instead of to_string to get string without
    // trailing zeros
    std::ostringstream raw_stream;
    raw_stream << value;
    const auto raw_decimal = raw_stream.str();
    const bool is_scientific = raw_decimal.find('e') != std::string::npos;
    if(
      raw_decimal.find('.') == std::string::npos &&
      !is_scientific) // don't add trailing .0 if in scientific notation
    {
      return raw_decimal + ".0";
    }
    return raw_decimal;
  }();
  const bool is_lossless = [&] {
    try
    {
      return std::stod(decimal) == value;
    }
    catch(std::out_of_range &)
    {
      return false;
    }
  }();
  const std::string lossless = [&]() -> std::string {
    if(is_lossless)
      return decimal;
    std::ostringstream stream;
    stream << std::hexfloat << value;
    return stream.str();
  }();
  const auto literal = is_float ? lossless + 'f' : lossless;
  if(is_lossless)
    return literal;
  return literal + " /* " + decimal + " */";
}
 
#endif // CPROVER_JAVA_BYTECODE_EXPR2JAVA_H