Function Descriptor

FunctionDescriptor represents the signature of a function.
FunctionDescriptor.of(MemoryLayout, … ) takes a variadic¹ input of MemoryLayouts. The first argument is the memory layout of the return type, and the rest correspond to the memory layouts of the function arguments.

For example, int foo(float, void*) would be represented as FunctionDescriptor.of(ValueLayout.JAVA_INT, ValueLayout.JAVA_FLOAT, ValueLayout.ADDRESS)

For void functions, FunctionDescriptor.ofVoid(MemoryLayout, … ) is a static method that is exactly the same as FunctionDescriptor.of(MemoryLayout, … ) except that its first argument corresponds to the first function argument rather than the return value.

For example, void foo(float, void*) would translate to FunctionDescriptor(ValueLayout.JAVA_FLOAT, ValueLayout.ADDRESS)

For additional information on FunctionDescriptor, visit Oracle's official documentation.