60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
/*
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* Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include <stdarg.h>
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#ifdef _WIN64
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#define EXPORT __declspec(dllexport)
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#else
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#define EXPORT
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#endif
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typedef struct {
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unsigned char* writeback;
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int* argids;
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} call_info;
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#define WRITEBACK_BYTES_PER_ARG 8
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#define write_back_ptr(type) ((type*)(info->writeback + (i * WRITEBACK_BYTES_PER_ARG)))
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// need to pass `num` separately as last argument preceding varargs according to spec (and for MSVC)
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EXPORT void varargs(call_info* info, int num, ...) {
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va_list a_list;
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va_start(a_list, num);
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for (int i = 0; i < num; i++) {
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int id = info->argids[i];
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switch (id) {
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case 0: // int
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*write_back_ptr(int) = va_arg(a_list, int);
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break;
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case 1: // double
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*write_back_ptr(double) = va_arg(a_list, double);
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break;
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}
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}
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va_end(a_list);
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}
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