//
// 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 is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
#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) {
+llvm::sys::MemoryBlock
+llvm::sys::Memory::AllocateRWX(unsigned NumBytes, const MemoryBlock* NearBlock,
+ std::string *ErrMsg) {
if (NumBytes == 0) return MemoryBlock();
- long pageSize = Process::GetPageSize();
+ unsigned 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");
+ MakeErrMsg(ErrMsg, "Can't open /dev/zero device");
+ return MemoryBlock();
}
fd = zero_fd;
#endif
MAP_ANON
#endif
;
- void *pa = ::mmap(0, pageSize*NumPages, PROT_READ|PROT_WRITE|PROT_EXEC,
+
+ void* start = NearBlock ? (unsigned char*)NearBlock->base() +
+ NearBlock->size() : 0;
+
+ void *pa = ::mmap(start, pageSize*NumPages, PROT_READ|PROT_WRITE|PROT_EXEC,
flags, fd, 0);
if (pa == MAP_FAILED) {
- ThrowErrno("Can't allocate RWX Memory");
+ if (NearBlock) //Try again without a near hint
+ return AllocateRWX(NumBytes, 0);
+
+ MakeErrMsg(ErrMsg, "Can't allocate RWX Memory");
+ return MemoryBlock();
}
MemoryBlock result;
result.Address = pa;
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");
- }
-}
-
+bool llvm::sys::Memory::ReleaseRWX(MemoryBlock &M, std::string *ErrMsg) {
+ if (M.Address == 0 || M.Size == 0) return false;
+ if (0 != ::munmap(M.Address, M.Size))
+ return MakeErrMsg(ErrMsg, "Can't release RWX Memory");
+ return false;
}