[llvm-commits] CVS: llvm/include/Config/pagesize.h

[Misha Brukman]

Changes in directory llvm/include/Config:

pagesize.h added (r1.1)

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Log message:

Add a target-independent way to query page size.


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Diffs of the changes:  (+49 -0)

Index: llvm/include/Config/pagesize.h
diff -c /dev/null llvm/include/Config/pagesize.h:1.1
*** /dev/null	Fri Jun 18 10:30:35 2004
--- llvm/include/Config/pagesize.h	Fri Jun 18 10:30:25 2004
***************
*** 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