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Diffstat (limited to 'lib/System/Unix/Memory.cpp')
-rw-r--r-- | lib/System/Unix/Memory.cpp | 70 |
1 files changed, 0 insertions, 70 deletions
diff --git a/lib/System/Unix/Memory.cpp b/lib/System/Unix/Memory.cpp deleted file mode 100644 index 370b318955..0000000000 --- a/lib/System/Unix/Memory.cpp +++ /dev/null @@ -1,70 +0,0 @@ -//===- Unix/Memory.cpp - Generic UNIX System Configuration ------*- C++ -*-===// -// -// The LLVM Compiler Infrastructure -// -// This file was developed by Reid Spencer and is distributed under the -// University of Illinois Open Source License. See LICENSE.TXT for details. -// -//===----------------------------------------------------------------------===// -// -// This file defines some functions for various memory management utilities. -// -//===----------------------------------------------------------------------===// - -#include "Unix.h" -#include "llvm/System/Process.h" - -#ifdef HAVE_SYS_MMAN_H -#include <sys/mman.h> -#endif - -namespace llvm { - -/// AllocateRWXMemory - Allocate a slab of memory with read/write/execute -/// permissions. This is typically used for JIT applications where we want -/// to emit code to the memory then jump to it. Getting this type of memory -/// is very OS specific. -/// -MemoryBlock Memory::AllocateRWX(unsigned NumBytes) { - if (NumBytes == 0) return MemoryBlock(); - - long pageSize = Process::GetPageSize(); - unsigned NumPages = (NumBytes+pageSize-1)/pageSize; - - int fd = -1; -#ifdef NEED_DEV_ZERO_FOR_MMAP - static int zero_fd = open("/dev/zero", O_RDWR); - if (zero_fd == -1) { - ThrowErrno("Can't open /dev/zero device"); - } - fd = zero_fd; -#endif - - int flags = MAP_PRIVATE | -#ifdef HAVE_MMAP_ANONYMOUS - MAP_ANONYMOUS -#else - MAP_ANON -#endif - ; - void *pa = ::mmap(0, pageSize*NumPages, PROT_READ|PROT_WRITE|PROT_EXEC, - flags, fd, 0); - if (pa == MAP_FAILED) { - ThrowErrno("Can't allocate RWX Memory"); - } - MemoryBlock result; - result.Address = pa; - result.Size = NumPages*pageSize; - return result; -} - -void Memory::ReleaseRWX(MemoryBlock& M) { - if (M.Address == 0 || M.Size == 0) return; - if (0 != ::munmap(M.Address, M.Size)) { - ThrowErrno("Can't release RWX Memory"); - } -} - -} - -// vim: sw=2 smartindent smarttab tw=80 autoindent expandtab |