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factoring out logic to check for overflows during coercions

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This commit is contained in:
Vern Paxson 2021-09-02 18:17:29 -07:00
parent 9757d37332
commit a67897135e
8 changed files with 89 additions and 37 deletions
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39
src/Overflow.cc Normal file
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// See the file "COPYING" in the main distribution directory for copyright.
#include "zeek/Overflow.h"
#include "zeek/Val.h"
namespace zeek::detail {
bool would_overflow(const zeek::Type* from_type, const zeek::Type* to_type,
const Val* val)
{
if ( ! to_type || ! from_type )
return true;
if ( same_type(to_type, from_type) )
return false;
if ( to_type->InternalType() == TYPE_INTERNAL_DOUBLE )
return false;
if ( to_type->InternalType() == TYPE_INTERNAL_UNSIGNED )
{
if ( from_type->InternalType() == TYPE_INTERNAL_DOUBLE )
return double_to_count_would_overflow(val->InternalDouble());
if ( from_type->InternalType() == TYPE_INTERNAL_INT )
return int_to_count_would_overflow(val->InternalInt());
}
if ( to_type->InternalType() == TYPE_INTERNAL_INT )
{
if ( from_type->InternalType() == TYPE_INTERNAL_DOUBLE )
return double_to_int_would_overflow(val->InternalDouble());
if ( from_type->InternalType() == TYPE_INTERNAL_UNSIGNED )
return count_to_int_would_overflow(val->InternalUnsigned());
}
return false;
}
}