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--!A cross-platform build utility based on Lua
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
-- http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
--
-- Copyright (C) 2026-present, Xmake Open Source Community.
--
-- @author karurochari
-- @file check_alignof.lua
--
-- imports
import("lib.detect.check_cxxsnippets")
local binary_match_pattern = 'INFO:align%[(%d+)%]'
local check_alignof_template = [[
#if defined(__cplusplus)
#if __cplusplus >= 201103L
#define ALIGNOF(type) alignof(type)
#endif
#elif __STDC_VERSION__ >= 202311L
#define ALIGNOF(type) alignof(type)
#elif __STDC_VERSION__ >= 201112L
#define ALIGNOF(type) _Alignof(type)
#elif defined(_MSC_VER)
#define ALIGNOF(type) __alignof(type)
#elif defined(__GNUC__) || defined(__clang__)
#define ALIGNOF(type) __alignof__(type)
#else
#error No known support of alignment detection for your toolchain
#endif
static char info_align[] = {'I', 'N', 'F', 'O', ':', 'a','l','i','g','n','[',
('0' + ((ALIGNOF(${TYPE}) / 10000)%10)),
('0' + ((ALIGNOF(${TYPE}) / 1000)%10)),
('0' + ((ALIGNOF(${TYPE}) / 100)%10)),
('0' + ((ALIGNOF(${TYPE}) / 10)%10)),
('0' + (ALIGNOF(${TYPE}) % 10)),
']',
'\0'};
int main(int argc, char *argv[]) {
int require = 0;
require += info_align[argc];
(void)argv;
return require;
}]]
function _binary_match(content)
local match = content:match(binary_match_pattern)
if match then
return match:ltrim("0")
end
end
-- check the alignment of type
--
-- @param typename the typename
-- @param opt the argument options
-- e.g.
-- { verbose = false, target = [target|option], includes = "stdio.h"
-- , configs = {defines = "xx", cxflags = ""}}
--
-- @return the type alignment
--
-- @code
-- local align = check_alignof("long")
-- local align = check_alignof("std::string", {includes = "string"})
-- @endcode
--
-- check the alignment of a C/C++ type
--
-- @param typename the type name, e.g. "int", "size_t"
-- @param opt the options, e.g. {includes = {"stddef.h"}, target = target}
-- @return the type alignment in bytes, or -1
--
function main(typename, opt)
local snippets = check_alignof_template:gsub('${TYPE}', typename)
local ok, size = check_cxxsnippets(snippets, table.join(table.wrap(opt), {binary_match = _binary_match}))
if ok then
return size
end
end
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