diff options
| author | Misha Brukman <brukman+llvm@gmail.com> | 2004-06-18 15:30:25 +0000 |
|---|---|---|
| committer | Misha Brukman <brukman+llvm@gmail.com> | 2004-06-18 15:30:25 +0000 |
| commit | 0ed24ad96875969749d653b3cfc8154ae3046c74 (patch) | |
| tree | cb97e465d5301e64f20aa610f98c08270c9d2c4a | |
| parent | 9d2427c07437a4ad473ff79a4746e08b9e4b87b3 (diff) | |
| download | llvm-0ed24ad96875969749d653b3cfc8154ae3046c74.tar.gz llvm-0ed24ad96875969749d653b3cfc8154ae3046c74.tar.bz2 llvm-0ed24ad96875969749d653b3cfc8154ae3046c74.tar.xz | |
Add a target-independent way to query page size.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14232 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | include/Config/pagesize.h | 49 | ||||
| -rw-r--r-- | include/llvm/Config/pagesize.h | 49 |
2 files changed, 98 insertions, 0 deletions
diff --git a/include/Config/pagesize.h b/include/Config/pagesize.h new file mode 100644 index 0000000000..638ece0328 --- /dev/null +++ b/include/Config/pagesize.h @@ -0,0 +1,49 @@ +/* + * 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: + * + * x86/Linux: _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 diff --git a/include/llvm/Config/pagesize.h b/include/llvm/Config/pagesize.h new file mode 100644 index 0000000000..638ece0328 --- /dev/null +++ b/include/llvm/Config/pagesize.h @@ -0,0 +1,49 @@ +/* + * 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: + * + * x86/Linux: _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 |