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On some platforms, global destructors are registered through a call to
__cxa_atexit(dtor, 0/*args*/, __dso_handle). While __cxa_atexit can be resolved
by the regular MemoryManager, __dso_handle (representing the "current shared
library" such that the corresponding atexit function can be called on its
dlclose) can not be resolved by MCJIT. Instead, we provide our own, poining to
the ExecutionEngine, which in turn holds a "current module" that corresponds in
spirit to the shared library handle.
__cxa_atexit, on the other hand, needs to be re-wired: the interpreter needs to
destruct globals upon its destruction, and those globals from a certain module
when that module is unloaded.
Both is done through a custom MemoryManager, significantly reducing the
complexity of the previous ("JIT without MC") implementation.
The custom MemoryManager also forwards in case of a unknown symbols to the LazyFunctionCreators instead of using the generic
ExecutionEngine::InstallLazyFunctionCreator() which has no effect with MCJIT.
MCJIT needs to finalize modules. To simplify the interface with MCJIT, each
transaction now has its own module. It gets created when the previous module
gets passed to the execution engine; the first one is created by
clang::CreateLLVMCodeGen(). CodeGen now releases the module such that it can be
added to the execution engine.
This enables simple use cases of cling with MCJIT; most notably cross-module
linking is still missing.
The cling::Value is initialized to be invalid then the value extraction changes it or not. If we do not have an available copy constructor for objects the value stays invalid.
Generalize the __cxa_atexit replacement to cover more symbols.
Because the JIT cannot handle inline asm, provide compiled symbols for relevant
functions until cling has switched to MCJIT.
This fixes the use of many boost libraries (e.g. regex) in cling on x86_64/i386.
Kudos to Marco Clemencic for the idea!
__cxa_atexit is generated by clang::CodeGen upon seeing the first static
destructor. Instead of trying to provoke that we just continue to search for it.
Remove trigger__cxa_atexit(), we will just remap until successful.
Remove unused dso parameter.
Instead of friending just provide a function.
Pass a transaction, the typesafe way.
