.. Copyright (C) 2015-2022 Free Software Foundation, Inc. Originally contributed by David Malcolm 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 . .. default-domain:: c ABI and API compatibility ========================= The libgccjit developers strive for ABI and API backward-compatibility: programs built against libgccjit.so stand a good chance of running without recompilation against newer versions of libgccjit.so, and ought to recompile without modification against newer versions of libgccjit.h. .. note:: The libgccjit++.h C++ API is more experimental, and less locked-down at this time. API compatibility is achieved by extending the API rather than changing it. For ABI compatiblity, we avoid bumping the SONAME, and instead use symbol versioning to tag each symbol, so that a binary linked against libgccjit.so is tagged according to the symbols that it uses. For example, :func:`gcc_jit_context_add_command_line_option` was added in ``LIBGCCJIT_ABI_1``. If a client program uses it, this can be detected from metadata by using ``objdump``: .. code-block:: bash $ objdump -p testsuite/jit/test-extra-options.c.exe | tail -n 8 Version References: required from libgccjit.so.0: 0x00824161 0x00 04 LIBGCCJIT_ABI_1 0x00824160 0x00 03 LIBGCCJIT_ABI_0 required from libc.so.6: You can see the symbol tags provided by libgccjit.so using ``objdump``: .. code-block:: bash $ objdump -p libgccjit.so | less [...snip...] Version definitions: 1 0x01 0x0ff81f20 libgccjit.so.0 2 0x00 0x00824160 LIBGCCJIT_ABI_0 3 0x00 0x00824161 LIBGCCJIT_ABI_1 LIBGCCJIT_ABI_0 [...snip...] Programmatically checking version ********************************* Client code can programmatically check libgccjit version using: .. function:: int gcc_jit_version_major (void) Return libgccjit major version. This is analogous to __GNUC__ in C code. .. function:: int gcc_jit_version_minor (void) Return libgccjit minor version. This is analogous to __GNUC_MINOR__ in C code. .. function:: int gcc_jit_version_patchlevel (void) Return libgccjit patchlevel version. This is analogous to __GNUC_PATCHLEVEL__ in C code. .. note:: These entry points has been added with ``LIBGCCJIT_ABI_13`` (see below). ABI symbol tags *************** The initial release of libgccjit (in gcc 5.1) did not use symbol versioning. Newer releases use the following tags. .. _LIBGCCJIT_ABI_0: ``LIBGCCJIT_ABI_0`` ------------------- All entrypoints in the initial release of libgccjit are tagged with ``LIBGCCJIT_ABI_0``, to signify the transition to symbol versioning. Binaries built against older copies of ``libgccjit.so`` should continue to work, with this being handled transparently by the linker (see `this post `_) .. _LIBGCCJIT_ABI_1: ``LIBGCCJIT_ABI_1`` ------------------- ``LIBGCCJIT_ABI_1`` covers the addition of :func:`gcc_jit_context_add_command_line_option` .. _LIBGCCJIT_ABI_2: ``LIBGCCJIT_ABI_2`` ------------------- ``LIBGCCJIT_ABI_2`` covers the addition of :func:`gcc_jit_context_set_bool_allow_unreachable_blocks` .. _LIBGCCJIT_ABI_3: ``LIBGCCJIT_ABI_3`` ------------------- ``LIBGCCJIT_ABI_3`` covers the addition of switch statements via API entrypoints: * :func:`gcc_jit_block_end_with_switch` * :func:`gcc_jit_case_as_object` * :func:`gcc_jit_context_new_case` .. _LIBGCCJIT_ABI_4: ``LIBGCCJIT_ABI_4`` ------------------- ``LIBGCCJIT_ABI_4`` covers the addition of timers via API entrypoints: * :func:`gcc_jit_context_get_timer` * :func:`gcc_jit_context_set_timer` * :func:`gcc_jit_timer_new` * :func:`gcc_jit_timer_release` * :func:`gcc_jit_timer_push` * :func:`gcc_jit_timer_pop` * :func:`gcc_jit_timer_print` .. _LIBGCCJIT_ABI_5: ``LIBGCCJIT_ABI_5`` ------------------- ``LIBGCCJIT_ABI_5`` covers the addition of :func:`gcc_jit_context_set_bool_use_external_driver` .. _LIBGCCJIT_ABI_6: ``LIBGCCJIT_ABI_6`` ------------------- ``LIBGCCJIT_ABI_6`` covers the addition of :func:`gcc_jit_rvalue_set_bool_require_tail_call` .. _LIBGCCJIT_ABI_7: ``LIBGCCJIT_ABI_7`` ------------------- ``LIBGCCJIT_ABI_7`` covers the addition of :func:`gcc_jit_type_get_aligned` .. _LIBGCCJIT_ABI_8: ``LIBGCCJIT_ABI_8`` ------------------- ``LIBGCCJIT_ABI_8`` covers the addition of :func:`gcc_jit_type_get_vector` .. _LIBGCCJIT_ABI_9: ``LIBGCCJIT_ABI_9`` ------------------- ``LIBGCCJIT_ABI_9`` covers the addition of :func:`gcc_jit_function_get_address` .. _LIBGCCJIT_ABI_10: ``LIBGCCJIT_ABI_10`` -------------------- ``LIBGCCJIT_ABI_10`` covers the addition of :func:`gcc_jit_context_new_rvalue_from_vector` .. _LIBGCCJIT_ABI_11: ``LIBGCCJIT_ABI_11`` -------------------- ``LIBGCCJIT_ABI_11`` covers the addition of :func:`gcc_jit_context_add_driver_option` .. _LIBGCCJIT_ABI_12: ``LIBGCCJIT_ABI_12`` -------------------- ``LIBGCCJIT_ABI_12`` covers the addition of :func:`gcc_jit_context_new_bitfield` .. _LIBGCCJIT_ABI_13: ``LIBGCCJIT_ABI_13`` -------------------- ``LIBGCCJIT_ABI_13`` covers the addition of version functions via API entrypoints: * :func:`gcc_jit_version_major` * :func:`gcc_jit_version_minor` * :func:`gcc_jit_version_patchlevel` .. _LIBGCCJIT_ABI_14: ``LIBGCCJIT_ABI_14`` -------------------- ``LIBGCCJIT_ABI_14`` covers the addition of :func:`gcc_jit_global_set_initializer` .. _LIBGCCJIT_ABI_15: ``LIBGCCJIT_ABI_15`` -------------------- ``LIBGCCJIT_ABI_15`` covers the addition of API entrypoints for directly embedding assembler instructions: * :func:`gcc_jit_block_add_extended_asm` * :func:`gcc_jit_block_end_with_extended_asm_goto` * :func:`gcc_jit_extended_asm_as_object` * :func:`gcc_jit_extended_asm_set_volatile_flag` * :func:`gcc_jit_extended_asm_set_inline_flag` * :func:`gcc_jit_extended_asm_add_output_operand` * :func:`gcc_jit_extended_asm_add_input_operand` * :func:`gcc_jit_extended_asm_add_clobber` * :func:`gcc_jit_context_add_top_level_asm` .. _LIBGCCJIT_ABI_16: ``LIBGCCJIT_ABI_16`` -------------------- ``LIBGCCJIT_ABI_16`` covers the addition of reflection functions via API entrypoints: * :func:`gcc_jit_function_get_return_type` * :func:`gcc_jit_function_get_param_count` * :func:`gcc_jit_type_dyncast_array` * :func:`gcc_jit_type_is_bool` * :func:`gcc_jit_type_is_integral` * :func:`gcc_jit_type_is_pointer` * :func:`gcc_jit_type_is_struct` * :func:`gcc_jit_type_dyncast_vector` * :func:`gcc_jit_type_unqualified` * :func:`gcc_jit_type_dyncast_function_ptr_type` * :func:`gcc_jit_function_type_get_return_type` * :func:`gcc_jit_function_type_get_param_count` * :func:`gcc_jit_function_type_get_param_type` * :func:`gcc_jit_vector_type_get_num_units` * :func:`gcc_jit_vector_type_get_element_type` * :func:`gcc_jit_struct_get_field` * :func:`gcc_jit_struct_get_field_count` .. _LIBGCCJIT_ABI_17: ``LIBGCCJIT_ABI_17`` ----------------------- ``LIBGCCJIT_ABI_17`` covers the addition of an API entrypoint to set the thread-local storage model of a variable: * :func:`gcc_jit_lvalue_set_tls_model` .. _LIBGCCJIT_ABI_18: ``LIBGCCJIT_ABI_18`` ----------------------- ``LIBGCCJIT_ABI_18`` covers the addition of an API entrypoint to set the link section of a variable: * :func:`gcc_jit_lvalue_set_link_section` .. _LIBGCCJIT_ABI_19: ``LIBGCCJIT_ABI_19`` ----------------------- ``LIBGCCJIT_ABI_19`` covers the addition of API entrypoints to set the initial value of a global with an rvalue and to use constructors: * :func:`gcc_jit_context_new_array_constructor` * :func:`gcc_jit_context_new_struct_constructor` * :func:`gcc_jit_context_new_union_constructor` * :func:`gcc_jit_global_set_initializer_rvalue` .. _LIBGCCJIT_ABI_20: ``LIBGCCJIT_ABI_20`` ----------------------- ``LIBGCCJIT_ABI_20`` covers the addition of sized integer types, including 128-bit integers and helper functions for types: * :func:`gcc_jit_compatible_types` * :func:`gcc_jit_type_get_size` * :c:macro:`GCC_JIT_TYPE_UINT8_T` * :c:macro:`GCC_JIT_TYPE_UINT16_T` * :c:macro:`GCC_JIT_TYPE_UINT32_T` * :c:macro:`GCC_JIT_TYPE_UINT64_T` * :c:macro:`GCC_JIT_TYPE_UINT128_T` * :c:macro:`GCC_JIT_TYPE_INT8_T` * :c:macro:`GCC_JIT_TYPE_INT16_T` * :c:macro:`GCC_JIT_TYPE_INT32_T` * :c:macro:`GCC_JIT_TYPE_INT64_T` * :c:macro:`GCC_JIT_TYPE_INT128_T` .. _LIBGCCJIT_ABI_21: ``LIBGCCJIT_ABI_21`` -------------------- ``LIBGCCJIT_ABI_21`` covers the addition of an API entrypoint to bitcast a value from one type to another: * :func:`gcc_jit_context_new_bitcast` .. _LIBGCCJIT_ABI_22: ``LIBGCCJIT_ABI_22`` -------------------- ``LIBGCCJIT_ABI_22`` covers the addition of an API entrypoint to set the register name of a variable: * :func:`gcc_jit_lvalue_set_register_name` .. _LIBGCCJIT_ABI_23: ``LIBGCCJIT_ABI_23`` -------------------- ``LIBGCCJIT_ABI_23`` covers the addition of an API entrypoint to hide stderr logs: * :func:`gcc_jit_context_set_bool_print_errors_to_stderr` .. _LIBGCCJIT_ABI_24: ``LIBGCCJIT_ABI_24`` -------------------- ``LIBGCCJIT_ABI_24`` covers the addition of functions to get and set the alignment of a variable: * :func:`gcc_jit_lvalue_set_alignment` * :func:`gcc_jit_lvalue_get_alignment`