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/*
* The LLVM Compiler Infrastructure
*
* This file was developed by the LLVM research group and is distributed under
* the University of Illinois Open Source License. See LICENSE.TXT for details.
*
******************************************************************************
*
* This header file provides a platform-independent way of quering page size.
*/
#ifndef PAGESIZE_H
#define PAGESIZE_H
#include "Config/unistd.h"
#include <sys/param.h>
namespace llvm {
/* Compatibility chart:
*
* Linux/x86: _SC_PAGESIZE, _SC_PAGE_SIZE
* MacOS X/PowerPC: v. 10.2: NBPG,
* v. 10.3: _SC_PAGESIZE
* Solaris/Sparc: _SC_PAGESIZE, _SC_PAGE_SIZE
*/
/**
* GetPageSize - wrapper to return page size in bytes for various
* architecture/OS combinations
*/
unsigned GetPageSize() {
#ifdef _SC_PAGESIZE
return sysconf(_SC_PAGESIZE);
#elif defined(_SC_PAGE_SIZE)
return sysconf(_SC_PAGE_SIZE);
#elif defined(NBPG)
#ifndef CLSIZE
#define CLSIZE 1
#endif
return NBPG * CLSIZE;
#else
return 4096; /* allocate 4KB as a fall-back */
#endif
}
}
#endif
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