blob: 2392e71e0db4361f50134484dcc34f8f62ef2aec (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
//===- Cygwin/Memory.cpp - Cygwin Memory Implementation ---------*- 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 provides the Cygwin specific implementation of various Memory
// management utilities
//
//===----------------------------------------------------------------------===//
// Include the generic unix implementation
#include "../Unix/Memory.cpp"
#include "llvm/System/Process.h"
#include <sys/types.h>
#include <sys/mman.h>
namespace llvm {
using namespace sys;
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only Cygwin specific code
//=== and must not be generic UNIX code (see ../Unix/Memory.cpp)
//===----------------------------------------------------------------------===//
MemoryBlock Memory::AllocateRWX(unsigned NumBytes) {
if (NumBytes == 0) return MemoryBlock();
static const long pageSize = Process::GetPageSize();
unsigned NumPages = (NumBytes+pageSize-1)/pageSize;
void *pa = mmap(0, pageSize*NumPages, PROT_READ|PROT_WRITE|PROT_EXEC,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
if (pa == (void*)-1) {
throw std::string("Can't allocate RWX Memory: ") + strerror(errno);
}
MemoryBlock result;
result.Address = pa;
result.Size = NumPages*pageSize;
return result;
}
void Memory::ReleaseRWX(Memory& M) {
if (M.Address == 0 || M.Size == 0) return;
if (0 != munmap(M.Address, M.Size)) {
throw std::string("Can't release RWX Memory: ") + strerror(errno);
}
}
}
// vim: sw=2 smartindent smarttab tw=80 autoindent expandtab
|
