You can generate calls that use a function pointer via :c:func:`gcc_jit_context_new_call_through_ptr`.
To do requires a :c:type:`gcc_jit_rvalue` of the correct function pointer type.
Function pointers for a :c:type:`gcc_jit_function` can be obtained via :c:func:`gcc_jit_function_get_address`.
Get the address of a function as an rvalue, of function pointer type.
This entrypoint was added in LIBGCCJIT_ABI_9; you can test for its presence using
#ifdef LIBGCCJIT_HAVE_gcc_jit_function_get_address
Alternatively, given an existing function, you can obtain a pointer to it in :c:type:`gcc_jit_rvalue` form using :c:func:`gcc_jit_context_new_rvalue_from_ptr`, using a function pointer type obtained using :c:func:`gcc_jit_context_new_function_ptr_type`.
Here’s an example of creating a function pointer type corresponding to C’s :c:type:`void (*) (int, int, int)`:
gcc_jit_type *void_type =
gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_VOID);
gcc_jit_type *int_type =
gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_INT);
/* Build the function ptr type. */
gcc_jit_type *param_types[3];
param_types[0] = int_type;
param_types[1] = int_type;
param_types[2] = int_type;
gcc_jit_type *fn_ptr_type =
gcc_jit_context_new_function_ptr_type (ctxt, NULL,
void_type,
3, param_types, 0);