1 1.1.1.4 mrg .. Copyright (C) 2017-2022 Free Software Foundation, Inc. 2 1.1 mrg Originally contributed by David Malcolm <dmalcolm (a] redhat.com> 3 1.1 mrg 4 1.1 mrg This is free software: you can redistribute it and/or modify it 5 1.1 mrg under the terms of the GNU General Public License as published by 6 1.1 mrg the Free Software Foundation, either version 3 of the License, or 7 1.1 mrg (at your option) any later version. 8 1.1 mrg 9 1.1 mrg This program is distributed in the hope that it will be useful, but 10 1.1 mrg WITHOUT ANY WARRANTY; without even the implied warranty of 11 1.1 mrg MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 1.1 mrg General Public License for more details. 13 1.1 mrg 14 1.1 mrg You should have received a copy of the GNU General Public License 15 1.1 mrg along with this program. If not, see 16 1.1.1.4 mrg <https://www.gnu.org/licenses/>. 17 1.1 mrg 18 1.1 mrg .. default-domain:: c 19 1.1 mrg 20 1.1 mrg Function pointers 21 1.1 mrg ================= 22 1.1 mrg 23 1.1 mrg You can generate calls that use a function pointer via 24 1.1 mrg :c:func:`gcc_jit_context_new_call_through_ptr`. 25 1.1 mrg 26 1.1 mrg To do requires a :c:type:`gcc_jit_rvalue` of the correct function pointer type. 27 1.1 mrg 28 1.1 mrg Function pointers for a :c:type:`gcc_jit_function` can be obtained 29 1.1 mrg via :c:func:`gcc_jit_function_get_address`. 30 1.1 mrg 31 1.1 mrg .. function:: gcc_jit_rvalue *\ 32 1.1 mrg gcc_jit_function_get_address (gcc_jit_function *fn,\ 33 1.1 mrg gcc_jit_location *loc) 34 1.1 mrg 35 1.1 mrg Get the address of a function as an rvalue, of function pointer 36 1.1 mrg type. 37 1.1 mrg 38 1.1 mrg This entrypoint was added in :ref:`LIBGCCJIT_ABI_9`; you can test 39 1.1 mrg for its presence using 40 1.1 mrg 41 1.1 mrg .. code-block:: c 42 1.1 mrg 43 1.1 mrg #ifdef LIBGCCJIT_HAVE_gcc_jit_function_get_address 44 1.1 mrg 45 1.1 mrg Alternatively, given an existing function, you can obtain a pointer 46 1.1 mrg to it in :c:type:`gcc_jit_rvalue` form using 47 1.1 mrg :c:func:`gcc_jit_context_new_rvalue_from_ptr`, using a function pointer 48 1.1 mrg type obtained using :c:func:`gcc_jit_context_new_function_ptr_type`. 49 1.1 mrg 50 1.1 mrg Here's an example of creating a function pointer type corresponding to C's 51 1.1 mrg :c:type:`void (*) (int, int, int)`: 52 1.1 mrg 53 1.1 mrg .. code-block:: c 54 1.1 mrg 55 1.1 mrg gcc_jit_type *void_type = 56 1.1 mrg gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_VOID); 57 1.1 mrg gcc_jit_type *int_type = 58 1.1 mrg gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_INT); 59 1.1 mrg 60 1.1 mrg /* Build the function ptr type. */ 61 1.1 mrg gcc_jit_type *param_types[3]; 62 1.1 mrg param_types[0] = int_type; 63 1.1 mrg param_types[1] = int_type; 64 1.1 mrg param_types[2] = int_type; 65 1.1 mrg 66 1.1 mrg gcc_jit_type *fn_ptr_type = 67 1.1 mrg gcc_jit_context_new_function_ptr_type (ctxt, NULL, 68 1.1 mrg void_type, 69 1.1 mrg 3, param_types, 0); 70 1.1 mrg 71 1.1 mrg .. function:: gcc_jit_type *\ 72 1.1 mrg gcc_jit_context_new_function_ptr_type (gcc_jit_context *ctxt,\ 73 1.1 mrg gcc_jit_location *loc,\ 74 1.1 mrg gcc_jit_type *return_type,\ 75 1.1 mrg int num_params,\ 76 1.1 mrg gcc_jit_type **param_types,\ 77 1.1 mrg int is_variadic) 78 1.1 mrg 79 1.1 mrg Generate a :c:type:`gcc_jit_type` for a function pointer with the 80 1.1 mrg given return type and parameters. 81 1.1.1.4 mrg 82 1.1.1.4 mrg Each of `param_types` must be non-`void`; `return_type` may be `void`. 83
Indexes created Sat Jun 06 00:24:59 UTC 2026