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//===-- VM.h - Definitions for Virtual Machine ------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the top-level Virtual Machine data structure.
//
//===----------------------------------------------------------------------===//
#ifndef VM_H
#define VM_H
#include "llvm/ExecutionEngine/ExecutionEngine.h"
#include "llvm/PassManager.h"
#include <map>
namespace llvm {
class Function;
class GlobalValue;
class Constant;
class TargetMachine;
class MachineCodeEmitter;
class VM : public ExecutionEngine {
TargetMachine &TM; // The current target we are compiling to
FunctionPassManager PM; // Passes to compile a function
MachineCodeEmitter *MCE; // MCE object
public:
VM(ModuleProvider *MP, TargetMachine *tm);
~VM();
/// create - Create an return a new JIT compiler if there is one available
/// for the current target. Otherwise, return null.
///
static ExecutionEngine *create(ModuleProvider *MP);
/// run - Start execution with the specified function and arguments.
///
virtual GenericValue run(Function *F,
const std::vector<GenericValue> &ArgValues);
/// getPointerToNamedFunction - This method returns the address of the
/// specified function by using the dlsym function call. As such it is only
/// useful for resolving library symbols, not code generated symbols.
///
void *getPointerToNamedFunction(const std::string &Name);
// CompilationCallback - Invoked the first time that a call site is found,
// which causes lazy compilation of the target function.
//
static void CompilationCallback();
/// runAtExitHandlers - Before exiting the program, at_exit functions must be
/// called. This method calls them.
///
static void runAtExitHandlers();
/// getPointerToFunction - This returns the address of the specified function,
/// compiling it if necessary.
///
void *getPointerToFunction(Function *F);
/// recompileAndRelinkFunction - This method is used to force a function
/// which has already been compiled, to be compiled again, possibly
/// after it has been modified. Then the entry to the old copy is overwritten
/// with a branch to the new copy. If there was no old copy, this acts
/// just like VM::getPointerToFunction().
///
void *recompileAndRelinkFunction(Function *F);
private:
static MachineCodeEmitter *createEmitter(VM &V);
void setupPassManager();
void runJITOnFunction (Function *F);
};
} // End llvm namespace
#endif
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