const MemoryBlock *NearBlock,
std::string *ErrMsg = 0);
- /// This method allocates a block of Read/Write memory. This memory
- /// needs to have executable permissions set before it can be used
- /// to execute JIT'ed code.
- ///
- /// On success, this returns a non-null memory block, otherwise it returns
- /// a null memory block and fills in *ErrMsg.
- ///
- /// @brief Allocate Read/Write/Execute memory.
- static MemoryBlock AllocateRW(unsigned NumBytes,
- const MemoryBlock *NearBlock,
- std::string *ErrMsg = 0);
-
/// This method releases a block of Read/Write/Execute memory that was
/// allocated with the AllocateRWX method. It should not be used to
/// release any memory block allocated any other way.
/// @throws std::string if an error occurred.
/// @brief Release Read/Write/Execute memory.
static bool ReleaseRWX(MemoryBlock &block, std::string *ErrMsg = 0);
-
/// @}
};
}
return result;
}
-/// AllocateRWMemory - Allocate a slab of memory with read/write permissions.
-/// This memory needs to have executable permissions set before it can be used
-/// to execute JIT'ed code.
-llvm::sys::MemoryBlock
-llvm::sys::Memory::AllocateRW(unsigned NumBytes, const MemoryBlock* NearBlock,
- std::string *ErrMsg) {
- 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) {
- MakeErrMsg(ErrMsg, "Can't open /dev/zero device");
- return MemoryBlock();
- }
- fd = zero_fd;
-#endif
-
- int flags = MAP_PRIVATE |
-#ifdef HAVE_MMAP_ANONYMOUS
- MAP_ANONYMOUS
-#else
- MAP_ANON
-#endif
- ;
-
- void* start = NearBlock ? (unsigned char*)NearBlock->base() +
- NearBlock->size() : 0;
-
- void *pa = ::mmap(start, pageSize*NumPages, PROT_READ|PROT_WRITE,
- flags, fd, 0);
- if (pa == MAP_FAILED) {
- if (NearBlock) //Try again without a near hint
- return AllocateRW(NumBytes, 0);
-
- MakeErrMsg(ErrMsg, "Can't allocate RWX Memory");
- return MemoryBlock();
- }
- MemoryBlock result;
- result.Address = pa;
- result.Size = NumPages*pageSize;
- return result;
-}
-
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 result;
}
-MemoryBlock Memory::AllocateRW(unsigned NumBytes,
- const MemoryBlock *NearBlock,
- std::string *ErrMsg) {
- if (NumBytes == 0) return MemoryBlock();
-
- static const long pageSize = Process::GetPageSize();
- unsigned NumPages = (NumBytes+pageSize-1)/pageSize;
-
- //FIXME: support NearBlock if ever needed on Win64.
-
- void *pa = VirtualAlloc(NULL, NumPages*pageSize, MEM_COMMIT,
- PAGE_READWRITE);
- if (pa == NULL) {
- MakeErrMsg(ErrMsg, "Can't allocate RWX Memory: ");
- return MemoryBlock();
- }
-
- MemoryBlock result;
- result.Address = pa;
- result.Size = NumPages*pageSize;
- return result;
-}
-
bool Memory::ReleaseRWX(MemoryBlock &M, std::string *ErrMsg) {
if (M.Address == 0 || M.Size == 0) return false;
if (!VirtualFree(M.Address, 0, MEM_RELEASE))