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 
19 namespace 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 
25 class MCJIT : public ExecutionEngine {
26   MCJIT(Module *M, TargetMachine *tm, TargetJITInfo &tji,
27         RTDyldMemoryManager *MemMgr, CodeGenOpt::Level OptLevel,
28         bool AllocateGVsWithCode);
29 
30   TargetMachine *TM;
31   MCContext *Ctx;
32   RTDyldMemoryManager *MemMgr;
33 
34   // FIXME: These may need moved to a separate 'jitstate' member like the
35   // non-MC JIT does for multithreading and such. Just keep them here for now.
36   PassManager PM;
37   Module *M;
38   // FIXME: This really doesn't belong here.
39   SmallVector<char, 4096> Buffer; // Working buffer into which we JIT.
40   raw_svector_ostream OS;
41 
42   RuntimeDyld Dyld;
43 
44 public:
45   ~MCJIT();
46 
47   /// @name ExecutionEngine interface implementation
48   /// @{
49 
50   virtual void *getPointerToBasicBlock(BasicBlock *BB);
51 
52   virtual void *getPointerToFunction(Function *F);
53 
54   virtual void *recompileAndRelinkFunction(Function *F);
55 
56   virtual void freeMachineCodeForFunction(Function *F);
57 
58   virtual GenericValue runFunction(Function *F,
59                                    const std::vector<GenericValue> &ArgValues);
60 
61   /// getPointerToNamedFunction - This method returns the address of the
62   /// specified function by using the dlsym function call.  As such it is only
63   /// useful for resolving library symbols, not code generated symbols.
64   ///
65   /// If AbortOnFailure is false and no function with the given name is
66   /// found, this function silently returns a null pointer. Otherwise,
67   /// it prints a message to stderr and aborts.
68   ///
69   void *getPointerToNamedFunction(const std::string &Name,
70                                   bool AbortOnFailure = true);
71   /// @}
72   /// @name (Private) Registration Interfaces
73   /// @{
74 
Register()75   static void Register() {
76     MCJITCtor = createJIT;
77   }
78 
79   static ExecutionEngine *createJIT(Module *M,
80                                     std::string *ErrorStr,
81                                     JITMemoryManager *JMM,
82                                     CodeGenOpt::Level OptLevel,
83                                     bool GVsWithCode,
84                                     TargetMachine *TM);
85 
86   // @}
87 };
88 
89 } // End llvm namespace
90 
91 #endif
92