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As emitter objects now own their callback objects, DeclCollector has two owners.
Fix that by using an explicit bridge callback for the Preprocessor that it can own.
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.
When building with RedHat's devtoolset the system's libstdc++.so is used. Missing
symbols are patched in to the binary through a static archive. We need to pull
more symbols from the archive to make them available to cling. This list will
possibly need to grow...
We might have a memory buffer taht causes the creation of other memory
buffers - which hang from our parent memory buffer, and get parsed before
we pop the diagnostics. The pop location must thus not be the end of our
memory buffer - because those later memory buffers might have created
later DiagStorePoints. Simply use the end location of the last memory
buffer - there cannot be any later Diag pop than that within our call.
This gets rid of the messy pulling-SourceLocations-out-of-thin-air and instead simply
uses begin and end of the relevant memory buffer where diags are meant to be suppressed.
The parser (or rather the BalancedDelimiterTracker) was doing a Parser::cutOffParsing() because
of an overflow of open ( - because we never reset the count.
