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//===-- VM.h - Definitions for Virtual Machine ------------------*- C++ -*-===//
//
// This file defines the top level Virtual Machine data structure.
//
//===----------------------------------------------------------------------===//
#ifndef VM_H
#define VM_H
#include "llvm/PassManager.h"
#include <string>
#include <map>
#include <vector>
class Function;
class GlobalValue;
class Constant;
class TargetMachine;
class MachineCodeEmitter;
class VM {
std::string ExeName;
Module &M; // The LLVM program we are running
TargetMachine &TM; // The current target we are compiling to
PassManager PM; // Passes to compile a function
MachineCodeEmitter *MCE; // MCE object
// GlobalAddress - A mapping between LLVM values and their native code
// generated versions...
std::map<const GlobalValue*, void *> GlobalAddress;
// FunctionRefs - A mapping between addresses that refer to unresolved
// functions and the LLVM function object itself. This is used by the fault
// handler to lazily patch up references...
//
std::map<void*, Function*> FunctionRefs;
public:
VM(const std::string &name, Module &m, TargetMachine &tm)
: ExeName(name), M(m), TM(tm) {
MCE = createEmitter(*this); // Initialize MCE
setupPassManager();
registerCallback();
emitGlobals();
}
~VM();
int run(Function *F);
void addGlobalMapping(const Function *F, void *Addr) {
void *&CurVal = GlobalAddress[(const GlobalValue*)F];
assert(CurVal == 0 && "GlobalMapping already established!");
CurVal = Addr;
}
void addFunctionRef(void *Ref, Function *F) {
FunctionRefs[Ref] = F;
}
const std::string &getFunctionReferencedName(void *RefAddr);
void *resolveFunctionReference(void *RefAddr);
private:
static MachineCodeEmitter *createEmitter(VM &V);
void setupPassManager();
void *getPointerToFunction(Function *F);
void registerCallback();
void emitGlobals();
void emitConstantToMemory(Constant *Init, void *Addr);
};
#endif
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