MCJIT.h revision 7803ec3d458ec73372760b838469292cdf38fe67 
1//===-- MCJIT.h - Class definition for the MCJIT ----------------*- C++ -*-===//
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#ifndef LLVM_LIB_EXECUTIONENGINE_MCJIT_H
11#define LLVM_LIB_EXECUTIONENGINE_MCJIT_H
12
13#include "llvm/PassManager.h"
14#include "llvm/ExecutionEngine/ExecutionEngine.h"
15#include "llvm/ExecutionEngine/RuntimeDyld.h"
16#include "llvm/ADT/SmallVector.h"
17#include "llvm/Support/raw_ostream.h"
18
19namespace llvm {
20
21// FIXME: This makes all kinds of horrible assumptions for the time being,
22// like only having one module, not needing to worry about multi-threading,
23// blah blah. Purely in get-it-up-and-limping mode for now.
24
25class MCJIT : public ExecutionEngine {
26  MCJIT(Module *M, TargetMachine *tm, TargetJITInfo &tji,
27        RTDyldMemoryManager *MemMgr, bool AllocateGVsWithCode);
28
29  TargetMachine *TM;
30  MCContext *Ctx;
31  RTDyldMemoryManager *MemMgr;
32
33  // FIXME: These may need moved to a separate 'jitstate' member like the
34  // non-MC JIT does for multithreading and such. Just keep them here for now.
35  PassManager PM;
36  Module *M;
37  // FIXME: This really doesn't belong here.
38  SmallVector<char, 4096> Buffer; // Working buffer into which we JIT.
39  raw_svector_ostream OS;
40
41  RuntimeDyld Dyld;
42
43public:
44  ~MCJIT();
45
46  /// @name ExecutionEngine interface implementation
47  /// @{
48
49  virtual void *getPointerToBasicBlock(BasicBlock *BB);
50
51  virtual void *getPointerToFunction(Function *F);
52
53  virtual void *recompileAndRelinkFunction(Function *F);
54
55  virtual void freeMachineCodeForFunction(Function *F);
56
57  virtual GenericValue runFunction(Function *F,
58                                   const std::vector<GenericValue> &ArgValues);
59
60  /// getPointerToNamedFunction - This method returns the address of the
61  /// specified function by using the dlsym function call.  As such it is only
62  /// useful for resolving library symbols, not code generated symbols.
63  ///
64  /// If AbortOnFailure is false and no function with the given name is
65  /// found, this function silently returns a null pointer. Otherwise,
66  /// it prints a message to stderr and aborts.
67  ///
68  virtual void *getPointerToNamedFunction(const std::string &Name,
69                                          bool AbortOnFailure = true);
70
71  /// mapSectionAddress - map a section to its target address space value.
72  /// Map the address of a JIT section as returned from the memory manager
73  /// to the address in the target process as the running code will see it.
74  /// This is the address which will be used for relocation resolution.
75  virtual void mapSectionAddress(void *LocalAddress, uint64_t TargetAddress) {
76    Dyld.mapSectionAddress(LocalAddress, TargetAddress);
77  }
78
79  /// @}
80  /// @name (Private) Registration Interfaces
81  /// @{
82
83  static void Register() {
84    MCJITCtor = createJIT;
85  }
86
87  static ExecutionEngine *createJIT(Module *M,
88                                    std::string *ErrorStr,
89                                    JITMemoryManager *JMM,
90                                    bool GVsWithCode,
91                                    TargetMachine *TM);
92
93  // @}
94};
95
96} // End llvm namespace
97
98#endif
99