.. currentmodule:: llvmlite.binding
The execution engine is where actual code generation and execution happen. At
present a single execution engine, MCJIT
, is exposed.
.. function:: create_mcjit_compiler(module, target_machine) Create a MCJIT-powered engine from the given *module* and *target_machine*. * *module* does not need to contain any code. * Returns a :class:`ExecutionEngine` instance.
.. function:: check_jit_execution() Ensure that the system allows creation of executable memory ranges for JIT-compiled code. If some security mechanism such as SELinux prevents it, an exception is raised. Otherwise the function returns silently. Calling this function early can help diagnose system configuration issues, instead of letting JIT-compiled functions crash mysteriously.
A wrapper around an LLVM execution engine. The following methods and properties are available:
.. method:: add_module(module) Add the *module*---a :class:`ModuleRef` instance---for code generation. When this method is called, ownership of the module is transferred to the execution engine.
.. method:: finalize_object() Make sure all modules owned by the execution engine are fully processed and usable for execution.
.. method:: get_function_address(name) Return the address of the function *name* as an integer. It's a fatal error in LLVM if the symbol of *name* doesn't exist.
.. method:: get_global_value_address(name) Return the address of the global value *name* as an integer. It's a fatal error in LLVM if the symbol of *name* doesn't exist.
.. method:: remove_module(module) Remove the *module*---a :class:`ModuleRef` instance---from the modules owned by the execution engine. This allows releasing the resources owned by the module without destroying the execution engine.
.. method:: add_object_file(object_file) Add the symbols from the specified object file to the execution engine. * *object_file* str or :class:`ObjectFileRef`: a path to the object file or a object file instance. Object file instance is not usable after this call.
.. method:: set_object_cache(notify_func=None, getbuffer_func=None) Set the object cache callbacks for this engine. * *notify_func*, if given, is called whenever the engine has finished compiling a module. It is passed the ``(module, buffer)`` arguments: * *module* is a :class:`ModuleRef` instance. * *buffer* is a bytes object of the code generated for the module. The return value is ignored. * *getbuffer_func*, if given, is called before the engine starts compiling a module. It is passed an argument, *module*, a :class:`ModuleRef` instance of the module being compiled. * It can return ``None``, in which case the module is compiled normally. * It can return a bytes object of native code for the module, which bypasses compilation entirely.
.. attribute:: target_data The :class:`TargetData` used by the execution engine.