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float.c
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float.c
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/* **********************************************************
* Copyright (c) 2013-2014 Google, Inc. All rights reserved.
* Copyright (c) 2009 VMware, Inc. All rights reserved.
* **********************************************************/
/* Dr. Memory: the memory debugger
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License, and no later version.
* This library 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
* Library General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
int
main()
{
char *p1;
float f;
double d;
double da[2];
int i;
printf("testing floats on heap\n");
p1 = (char *) malloc(64);
f = *((float *)p1); /* error: uninitialized, but won't report until used */
if (f < 0.f) /* use -> reported */
d = 4.;
/* For doubles Dr. Memory will report right away since no shadowing
* of floating-point registers: except w/ the new i#471 heuristic we need
* to add a use.
*/
d = *((double *)(p1+8)); /* error: uninitialized */
if (d < 0.) /* use -> reported */
d = 4.;
*((float*)(p1+16)) = 0.f;
d = *((double *)(p1+16)); /* error: half uninitialized */
if (d < 0.) /* use -> reported */
d = 4.;
*((float*)(p1+28)) = 0.f;
d = *((double *)(p1+24)); /* error: other half uninitialized */
if (d < 0.) /* use -> reported */
d = 4.;
/* test unaligned */
d = *((double *)(p1+34)); /* error: uninitialized */
if (d < 0.) /* use -> reported */
d = 4.;
free((void *)p1);
printf("testing floats on stack\n");
da[0] = 0.;
i = 1; /* if we use da[1] cl identifies the bad read */
if (da[i] < 0.f) /* error: uninitialized */
d = 4.;
printf("all done\n");
return 0;
}