mirror of
https://github.com/FirebirdSQL/firebird.git
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140 lines
3.0 KiB
C++
140 lines
3.0 KiB
C++
/*
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* The contents of this file are subject to the Interbase Public
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* License Version 1.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy
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* of the License at http://www.Inprise.com/IPL.html
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*
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* Software distributed under the License is distributed on an
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* "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express
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* or implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code was created by Inprise Corporation
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* and its predecessors. Portions created by Inprise Corporation are
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* Copyright (C) Inprise Corporation.
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*
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* All Rights Reserved.
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* Contributor(s): ______________________________________.
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*/
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/*
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$Id: align.cpp,v 1.10 2005-05-27 22:44:39 asfernandes Exp $
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*/
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#include "firebird.h"
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#include <signal.h>
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#include <stdio.h>
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struct xyz {
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char a;
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double b;
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};
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typedef xyz* XYZ;
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#define MAJOR_MINOR "((n + b - 1) & ~(b - 1))"
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#define EVEN "((n + 1) & ~1)"
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#define NO_OP "(n)"
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struct alignment {
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short rule_offset;
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short rule_length;
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short rule_faults;
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short rule_base_align;
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short rule_double_align;
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const char *rule_rule;
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const char *rule_system;
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};
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static const alignment rules[] = {
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1, 9, 0, 4, 4, NO_OP, "VMS", /* VMS */
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2, 10, 0, 4, 4, EVEN, "MC 68K", /* Generic Motorola */
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4, 12, 0, 4, 4, MAJOR_MINOR, "VAX Ultrix, 386i, RT", /* VAX Ultrix */
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8, 16, 1, 8, 8, MAJOR_MINOR, "HP Precision", /* HP Precision */
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8, 16, 0, 4, 8, MAJOR_MINOR, "Sparc", /* MIPS, Sun Sparc */
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0, 0, 0, 0, 0
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};
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static void check_byte_order(void);
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static int check_double(void);
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static void handler(void);
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static JMP_BUF env;
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int main(int argc, char *argv[])
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{
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#if SIZEOF_LONG == 8
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int vector[3];
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#else
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long vector[3];
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#endif
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const short offset = (int) &((XYZ) NULL)->b;
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const short length = sizeof(xyz);
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const short faults = check_double();
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for (const alignment* rule = rules; rule->rule_offset; ++rule)
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if (rule->rule_offset == offset &&
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rule->rule_length == length && rule->rule_faults == faults)
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{
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printf("\n/* %s */\n\n", rule->rule_system);
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printf("#define ALIGNMENT\t%d\n", rule->rule_base_align);
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printf("#define DOUBLE_ALIGN\t%d\n", rule->rule_double_align);
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printf("#define FB_ALIGN(n, b)\t%s\n", rule->rule_rule);
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check_byte_order();
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printf("\n");
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return 1;
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}
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printf("Unknown system, double offset %d, structure length %d\n",
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offset, length);
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check_byte_order();
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return 1;
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}
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static void check_byte_order(void)
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{
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union {
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short s;
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char c[2];
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} order_test;
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order_test.c[0] = 1;
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order_test.c[1] = 2;
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if (order_test.s == 0x0102)
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printf("#define WORDS_BIGENDIAN\t\t1\n");
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}
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static int check_double(void)
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{
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double *p;
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#if SIZEOF_LONG == 8
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int vector[3];
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#else
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long vector[3];
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#endif
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try {
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signal(SIGBUS, handler);
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signal(SIGSEGV, handler);
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p = (double *) &vector[0];
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*p = 3;
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*p *= 2.5;
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p = (double *) &vector[1];
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*p = 3;
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*p *= 2.5;
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}
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catch(const std::exception&) {
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return 1;
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}
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return 0;
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}
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static void handler()
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{
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Firebird::status_exception::raise();
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}
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