operator new and operator delete

system · August 18, 2012, 3:58pm

Hello.
Arduino 1.0 has introduced support for new and delete, but, unfortunately, only 1/6 part of required operators are implemented. Another problem is that this 1/6 part does not conform to the C++ standard and leads to undefined behavior in case if you run out of RAM.

There is uClibc++ posrt to arduino which has proper implementation for all required overloads for operator new and delete. But it conflicts with arduino library because both define implementation for the most commonly used operator new(size_t numBytes). You can take it here:

In my opinion ideal solution would be to include STL implementation in arduino project. If you find this not feasible, please resolve conflict with uClibc++ library by either removing incomplete and incorrect realization of operator new and operator delete or by providing correct one (so I would be able to disable it in uClibc++). I would prefer if standard library will not be teared apart.

One of possible solutions:

github.com/arduino/Arduino

Fix operator new

arduino:master ← kibergus:fix_operator_new

opened 07:59PM - 12 Aug 12 UTC

kibergus

+75 -42

Implementation of operator new in arduino contradicts C++ standard. If malloc re…turned NULL it MUST throw exception or cal std::terminate in case if exceptions are disabled. If you want operator new to return NULL just use non throw version of it which is not provided by arduino. Beside that, there should be operator new[] and placement variants of the operators. There is correct realization in uclibc++ and I suggest using it instead of current implementation. To achieve it gnu ABI specific functions must be moved to separate header (see https://github.com/arduino/Arduino/pull/107). After that new.h and new.cpp must be deleted and uclibc++ should be used instead. If you have strong objections against uclibc++ but are still concerned about quality of the library, I can separate implementation of operator new from uclibc++ and provide patches for integrating it to arduino. But this is not a right way because it would tear standard library implementation to peaces.

Here is a description how operator new should handle situation, when malloc returned 0:
http://kibergus.su/en/node/92

Thanks.

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operator new and operator delete

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