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Added (optional) protection against divide by zero exceptions

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defining the preprocessor CHAISCRIPT_PROTECT_DIVIDEBYZERO adds checking of right side values before division arithmetic, allowing the user to safely catch a divide by zero error, rather than dealing with a SIGFPE and having the entire program exit without a choice
This commit is contained in:
Luis Finke
2014-10-24 17:41:33 -04:00
parent 0a7e7b3a0d
commit b41c0f432b
1 changed files with 28 additions and 0 deletions
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28
include/chaiscript/dispatchkit/boxed_number.hpp
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@@ -22,6 +22,22 @@ namespace chaiscript {
class Dynamic_Cast_Conversions;
} // namespace chaiscript
namespace chaiscript
{
namespace exception
{
struct arithmetic_error : public std::runtime_error
{
std::string reason;
arithmetic_error(const std::string& reason) : std::runtime_error(std::string("Arithmetic error: ").append(reason)), reason(reason) {}
arithmetic_error(const char* reason) : std::runtime_error(std::string("Arithmetic error: ").append(reason)), reason(reason) {}
virtual ~arithmetic_error() {}
};
#define CHAISCRIPT_ARITHMETIC_CHECKDIVIDEBYZERO(T, n) if(std::is_arithmetic<T>::value) if(n==0) throw chaiscript::exception::arithmetic_error("divide by zero");
}
}
namespace chaiscript
{
@@ -89,6 +105,9 @@ namespace chaiscript
t += u;
break;
case Operators::assign_quotient:
#ifdef CHAISCRIPT_PROTECT_DIVIDEBYZERO
CHAISCRIPT_ARITHMETIC_CHECKDIVIDEBYZERO(U, u)
#endif
t /= u;
break;
case Operators::assign_difference:
@@ -122,6 +141,9 @@ namespace chaiscript
t >>= u;
break;
case Operators::assign_remainder:
#ifdef CHAISCRIPT_PROTECT_DIVIDEBYZERO
CHAISCRIPT_ARITHMETIC_CHECKDIVIDEBYZERO(U, u)
#endif
t %= u;
break;
case Operators::assign_bitwise_xor:
@@ -146,6 +168,9 @@ namespace chaiscript
case Operators::shift_right:
return const_var(t >> u);
case Operators::remainder:
#ifdef CHAISCRIPT_PROTECT_DIVIDEBYZERO
CHAISCRIPT_ARITHMETIC_CHECKDIVIDEBYZERO(U, u)
#endif
return const_var(t % u);
case Operators::bitwise_and:
return const_var(t & u);
@@ -171,6 +196,9 @@ namespace chaiscript
case Operators::sum:
return const_var(t + u);
case Operators::quotient:
#ifdef CHAISCRIPT_PROTECT_DIVIDEBYZERO
CHAISCRIPT_ARITHMETIC_CHECKDIVIDEBYZERO(U, u)
#endif
return const_var(t / u);
case Operators::product:
return const_var(t * u);