MCJIT.h revision 3f23cef24fc9200def464bd4bce820678b5715de 
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
17namespace llvm {
18
19class ObjectImage;
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, RTDyldMemoryManager *MemMgr,
27        bool AllocateGVsWithCode);
28
29  TargetMachine *TM;
30  MCContext *Ctx;
31  RTDyldMemoryManager *MemMgr;
32  RuntimeDyld Dyld;
33
34  // FIXME: Add support for multiple modules
35  bool isCompiled;
36  Module *M;
37  OwningPtr<ObjectImage> LoadedObject;
38
39public:
40  ~MCJIT();
41
42  /// @name ExecutionEngine interface implementation
43  /// @{
44
45  virtual void *getPointerToBasicBlock(BasicBlock *BB);
46
47  virtual void *getPointerToFunction(Function *F);
48
49  virtual void *recompileAndRelinkFunction(Function *F);
50
51  virtual void freeMachineCodeForFunction(Function *F);
52
53  virtual GenericValue runFunction(Function *F,
54                                   const std::vector<GenericValue> &ArgValues);
55
56  /// getPointerToNamedFunction - This method returns the address of the
57  /// specified function by using the dlsym function call.  As such it is only
58  /// useful for resolving library symbols, not code generated symbols.
59  ///
60  /// If AbortOnFailure is false and no function with the given name is
61  /// found, this function silently returns a null pointer. Otherwise,
62  /// it prints a message to stderr and aborts.
63  ///
64  virtual void *getPointerToNamedFunction(const std::string &Name,
65                                          bool AbortOnFailure = true);
66
67  /// mapSectionAddress - map a section to its target address space value.
68  /// Map the address of a JIT section as returned from the memory manager
69  /// to the address in the target process as the running code will see it.
70  /// This is the address which will be used for relocation resolution.
71  virtual void mapSectionAddress(const void *LocalAddress,
72                                 uint64_t TargetAddress) {
73    Dyld.mapSectionAddress(LocalAddress, TargetAddress);
74  }
75
76  /// @}
77  /// @name (Private) Registration Interfaces
78  /// @{
79
80  static void Register() {
81    MCJITCtor = createJIT;
82  }
83
84  static ExecutionEngine *createJIT(Module *M,
85                                    std::string *ErrorStr,
86                                    JITMemoryManager *JMM,
87                                    bool GVsWithCode,
88                                    TargetMachine *TM);
89
90  // @}
91
92protected:
93  /// emitObject -- Generate a JITed object in memory from the specified module
94  /// Currently, MCJIT only supports a single module and the module passed to
95  /// this function call is expected to be the contained module.  The module
96  /// is passed as a parameter here to prepare for multiple module support in
97  /// the future.
98  void emitObject(Module *M);
99};
100
101} // End llvm namespace
102
103#endif
104