JIT.h revision 82d8277ad5862b54341808812bb4016e52347060 
1//===-- VM.h - Definitions for Virtual Machine ------------------*- C++ -*-===//
2//
3// This file defines the top-level Virtual Machine data structure.
4//
5//===----------------------------------------------------------------------===//
6
7#ifndef VM_H
8#define VM_H
9
10#include "../ExecutionEngine.h"
11#include "llvm/PassManager.h"
12#include <map>
13
14class Function;
15class GlobalValue;
16class Constant;
17class TargetMachine;
18class MachineCodeEmitter;
19
20class VM : public ExecutionEngine {
21  TargetMachine &TM;       // The current target we are compiling to
22  FunctionPassManager PM;  // Passes to compile a function
23  MachineCodeEmitter *MCE; // MCE object
24
25public:
26  VM(Module *M, TargetMachine *tm);
27  ~VM();
28
29  /// create - Create an return a new JIT compiler if there is one available
30  /// for the current target.  Otherwise, return null.
31  ///
32  static ExecutionEngine *create(Module *M);
33
34  /// run - Start execution with the specified function and arguments.
35  ///
36  virtual int run(const std::string &FnName,
37                  const std::vector<std::string> &Args,
38                  const char ** envp);
39
40  /// getPointerToNamedFunction - This method returns the address of the
41  /// specified function by using the dlsym function call.  As such it is only
42  /// useful for resolving library symbols, not code generated symbols.
43  ///
44  void *getPointerToNamedFunction(const std::string &Name);
45
46  // CompilationCallback - Invoked the first time that a call site is found,
47  // which causes lazy compilation of the target function.
48  //
49  static void CompilationCallback();
50
51  /// runAtExitHandlers - Before exiting the program, at_exit functions must be
52  /// called.  This method calls them.
53  ///
54  static void runAtExitHandlers();
55
56  /// getPointerToFunction - This returns the address of the specified function,
57  /// compiling it if necessary.
58  void *getPointerToFunction(Function *F);
59
60private:
61  static MachineCodeEmitter *createEmitter(VM &V);
62  void setupPassManager();
63};
64
65#endif
66