1 //===- RemoteTarget.cpp - LLVM Remote process JIT execution --------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // Implementation of the RemoteTarget class which executes JITed code in a
11 // separate address range from where it was built.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #include "RemoteTarget.h"
16 #include <llvm/ADT/StringRef.h>
17 #include <llvm/Support/DataTypes.h>
18 #include <llvm/Support/Memory.h>
19 #include <stdlib.h>
20 #include <string>
21 using namespace llvm;
22
allocateSpace(size_t Size,unsigned Alignment,uint64_t & Address)23 bool RemoteTarget::allocateSpace(size_t Size, unsigned Alignment,
24 uint64_t &Address) {
25 sys::MemoryBlock *Prev = Allocations.size() ? &Allocations.back() : NULL;
26 sys::MemoryBlock Mem = sys::Memory::AllocateRWX(Size, Prev, &ErrorMsg);
27 if (Mem.base() == NULL)
28 return true;
29 if ((uintptr_t)Mem.base() % Alignment) {
30 ErrorMsg = "unable to allocate sufficiently aligned memory";
31 return true;
32 }
33 Address = reinterpret_cast<uint64_t>(Mem.base());
34 return false;
35 }
36
loadData(uint64_t Address,const void * Data,size_t Size)37 bool RemoteTarget::loadData(uint64_t Address, const void *Data, size_t Size) {
38 memcpy ((void*)Address, Data, Size);
39 sys::MemoryBlock Mem((void*)Address, Size);
40 sys::Memory::setExecutable(Mem, &ErrorMsg);
41 return false;
42 }
43
loadCode(uint64_t Address,const void * Data,size_t Size)44 bool RemoteTarget::loadCode(uint64_t Address, const void *Data, size_t Size) {
45 memcpy ((void*)Address, Data, Size);
46 return false;
47 }
48
executeCode(uint64_t Address,int & RetVal)49 bool RemoteTarget::executeCode(uint64_t Address, int &RetVal) {
50 int (*fn)(void) = (int(*)(void))Address;
51 RetVal = fn();
52 return false;
53 }
54
create()55 void RemoteTarget::create() {
56 }
57
stop()58 void RemoteTarget::stop() {
59 for (unsigned i = 0, e = Allocations.size(); i != e; ++i)
60 sys::Memory::ReleaseRWX(Allocations[i]);
61 }
62