This patch adds a new function-pointers.rst topic page to the libgccjit docs.
Committed to trunk as r253257. gcc/jit/ChangeLog: * docs/topics/expressions.rst (Function calls): Add link to gcc_jit_context_new_function_ptr_type. (Function pointers): Convert to cross-references to function-pointers.rst, moving material there. * docs/topics/function-pointers.rst: New page. * docs/topics/index.rst: Add function-pointers.rst. * docs/topics/types.rst (Function pointer types): New section. * docs/_build/texinfo/libgccjit.texi: Regenerate. --- gcc/jit/docs/topics/expressions.rst | 21 ++++---- gcc/jit/docs/topics/function-pointers.rst | 80 +++++++++++++++++++++++++++++++ gcc/jit/docs/topics/index.rst | 1 + gcc/jit/docs/topics/types.rst | 6 +++ 4 files changed, 96 insertions(+), 12 deletions(-) create mode 100644 gcc/jit/docs/topics/function-pointers.rst diff --git a/gcc/jit/docs/topics/expressions.rst b/gcc/jit/docs/topics/expressions.rst index f5c2d0f..76aa4eb 100644 --- a/gcc/jit/docs/topics/expressions.rst +++ b/gcc/jit/docs/topics/expressions.rst @@ -416,7 +416,8 @@ Function calls int numargs, \ gcc_jit_rvalue **args) - Given an rvalue of function pointer type, and the given table of + Given an rvalue of function pointer type (e.g. from + :c:func:`gcc_jit_context_new_function_ptr_type`), and the given table of argument rvalues, construct a call to the function pointer, with the result as an rvalue. @@ -452,19 +453,15 @@ Function calls Function pointers ***************** -.. function:: gcc_jit_rvalue *\ - gcc_jit_function_get_address (gcc_jit_function *fn,\ - gcc_jit_location *loc) - - Get the address of a function as an rvalue, of function pointer - type. +Function pointers can be obtained: - This entrypoint was added in :ref:`LIBGCCJIT_ABI_9`; you can test - for its presence using - - .. code-block:: c + * from a :c:type:`gcc_jit_function` using + :c:func:`gcc_jit_function_get_address`, or - #ifdef LIBGCCJIT_HAVE_gcc_jit_function_get_address + * from an existing function 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`. Type-coercion ************* diff --git a/gcc/jit/docs/topics/function-pointers.rst b/gcc/jit/docs/topics/function-pointers.rst new file mode 100644 index 0000000..b5b9d1b --- /dev/null +++ b/gcc/jit/docs/topics/function-pointers.rst @@ -0,0 +1,80 @@ +.. Copyright (C) 2017 Free Software Foundation, Inc. + Originally contributed by David Malcolm <dmalc...@redhat.com> + + This is free software: you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see + <http://www.gnu.org/licenses/>. + +.. default-domain:: c + +Function pointers +================= + +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`. + +.. function:: gcc_jit_rvalue *\ + gcc_jit_function_get_address (gcc_jit_function *fn,\ + gcc_jit_location *loc) + + Get the address of a function as an rvalue, of function pointer + type. + + This entrypoint was added in :ref:`LIBGCCJIT_ABI_9`; you can test + for its presence using + + .. code-block:: c + + #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)`: + +.. code-block:: c + + 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); + +.. function:: gcc_jit_type *\ + gcc_jit_context_new_function_ptr_type (gcc_jit_context *ctxt,\ + gcc_jit_location *loc,\ + gcc_jit_type *return_type,\ + int num_params,\ + gcc_jit_type **param_types,\ + int is_variadic) + + Generate a :c:type:`gcc_jit_type` for a function pointer with the + given return type and parameters. diff --git a/gcc/jit/docs/topics/index.rst b/gcc/jit/docs/topics/index.rst index 890f21c..a912a6d 100644 --- a/gcc/jit/docs/topics/index.rst +++ b/gcc/jit/docs/topics/index.rst @@ -26,6 +26,7 @@ Topic Reference types.rst expressions.rst functions.rst + function-pointers.rst locations.rst compilation.rst compatibility.rst diff --git a/gcc/jit/docs/topics/types.rst b/gcc/jit/docs/topics/types.rst index c279222..35a8231 100644 --- a/gcc/jit/docs/topics/types.rst +++ b/gcc/jit/docs/topics/types.rst @@ -309,3 +309,9 @@ You can model C `struct` types by creating :c:type:`gcc_jit_struct *` and :start-after: /* Quote from here in docs/topics/types.rst. */ :end-before: /* Quote up to here in docs/topics/types.rst. */ :language: c + +Function pointer types +---------------------- + +Function pointer types can be created using +:c:func:`gcc_jit_context_new_function_ptr_type`. -- 1.8.5.3