On 12 March 2013 06:02, Tim Schumacher wrote: > Hi All, > > I am using debian linux with gcc 4.7.2. > > I am curious and want to educate myself about the particular implementations > of the operators new, new[], delete and delete[]. > > Specifically, I was curious about what meta data is stored about the > allocations (size/# of elements in the array case), and where that data is > stored. I have the source for gcc-4.7.2 and I looked through it, but it was > not obvious where to start. I guess I was expecting to see some sort of > metadata structure placed in the heap right before the returned pointer but > I didn't see anything like that, or at least it was not obvious to me if I > was looking at it. > > Does anyone know which source files contain the magic? Or better yet, can > anyone point me to a design doc that describes the overall strategy? See libstdc++-v3/libsupc++/new_*.cc and libstdc++-v3/libsupc++/del_*.cc for the actual (de)allocation operators. G++ follows the cross-vendor C++ ABI which describes the cookies used by new[] at http://mentorembedded.github.com/cxx-abi/abi.html#array-cookies The code for doing that is somewhere in the C++ front-end, gcc/cp/*.c
