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    <p>Precise mode in Boehm GC under Mono isn't just <code>GC_MALLOC_ATOMIC</code>. It's only true for arrays of fundamental types.</p> <p>For managed types, <code>GC_gcj_malloc</code> is used. Mono's compiler generates an object descriptor for every managed type and it then simply calls <code>GC_gcj_malloc</code> with an argument of size, and a pointer to the managed type's descriptor. Boehm GC then refers to the descriptor during mark phase to trace the managed pointers.</p> <p>You will end up with just the root pointers sitting on the stack as raw pointers (<code>GC_gcj_malloc</code> returns a void* and there's no way to tell the GC where the pointers are on the stack via some sort of a stack descriptor prior to GC collect). This is the reason Mono (prior to SGen) says they scan the stack in conservative mode.</p> <p>If you want to implement this under C++, you won't be able to simply rely on the C++ compiler to generate the object descriptor for you. What I envisioned a long time ago was to write an intermediate compiler that parses all your C++ header files for class definitions that have been marked as managed class (e.g. <code>_ref class MyManagedObject</code> where <code>_ref</code> is simply a <code>#define</code> to nothing) and generate a header file containing those object descriptors. You would then use the <code>GC_make_descriptor</code> and <code>GC_malloc_explicitly_typed</code> functions to allocate your objects in precise mode rather than <code>GC_gcj_malloc</code> as you would not have control over how your C++ compiler allocates its vtable.</p> <p>*EDIT: See <a href="http://managedcpp.sourceforge.net" rel="nofollow">Managed C++ for GCC (open source GPL v3)</a>.</p>
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