[all-commits] [llvm/llvm-project] a01f77: [ORC] Add MethodWrapperHandler utility for Wrapper...

[lhames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a01f772d19d53976a6d6e0eed684440e4f2cc9da
      https://github.com/llvm/llvm-project/commit/a01f772d19d53976a6d6e0eed684440e4f2cc9da
  Author: Lang Hames <lhames at gmail.com>
  Date:   2021-09-16 (Thu, 16 Sep 2021)

  Changed paths:
    M llvm/include/llvm/ExecutionEngine/Orc/Shared/WrapperFunctionUtils.h
    M llvm/unittests/ExecutionEngine/Orc/WrapperFunctionUtilsTest.cpp

  Log Message:
  -----------
  [ORC] Add MethodWrapperHandler utility for WrapperFunction.

MethodWrapperHandler removes some of the boilerplate when writing wrapper
functions to wrap method calls. It can be used as a handler for wrapper
functions whose first argument is an ExecutorAddress: the address is cast to a
pointer of the given class type, then the given method function pointer is
called on that object pointer (passing the rest of the arguments).

E.g.

class MyClass {
public:
  void myMethod(uint32_t, bool) { ... }
};

// SPS Method signature for myMethod -- note MyClass object address as first
// argument.
using SPSMyMethodWrapperSignature =
  SPSTuple<SPSExecutorAddress, uint32_t, bool>;

// Wrapper function for myMethod.
WrapperFunctionResult
myMethodCallWrapper(const char *ArgData, size_t ArgSize) {
  return WrapperFunction<SPSMyMethodWrapperSignature>::handle(
     ArgData, ArgSize, makeMethodWrapperHandler(&MyClass::myMethod));
}