JIT.h revision 69582b35b6aa4e48cbbad7f6f1193c967da96b25 
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  /// run - Start execution with the specified function and arguments.
30  ///
31  virtual int run(const std::string &FnName,
32                  const std::vector<std::string> &Args,
33                  const char ** envp);
34
35  /// getPointerToNamedFunction - This method returns the address of the
36  /// specified function by using the dlsym function call.  As such it is only
37  /// useful for resolving library symbols, not code generated symbols.
38  ///
39  void *getPointerToNamedFunction(const std::string &Name);
40
41  // CompilationCallback - Invoked the first time that a call site is found,
42  // which causes lazy compilation of the target function.
43  //
44  static void CompilationCallback();
45
46  /// runAtExitHandlers - Before exiting the program, at_exit functions must be
47  /// called.  This method calls them.
48  ///
49  static void runAtExitHandlers();
50
51  /// getPointerToFunction - This returns the address of the specified function,
52  /// compiling it if necessary.
53  void *getPointerToFunction(Function *F);
54
55private:
56  static MachineCodeEmitter *createEmitter(VM &V);
57  void setupPassManager();
58};
59
60#endif
61