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//===- ExecutionEngine.h - Abstract Execution Engine Interface --*- C++ -*-===//
//
// This file defines the abstract interface that implements execution support
// for LLVM.
//
//===----------------------------------------------------------------------===//
#ifndef EXECUTION_ENGINE_H
#define EXECUTION_ENGINE_H
#include <vector>
#include <string>
#include <map>
#include <cassert>
class Constant;
class Type;
class GlobalValue;
class Function;
class Module;
class TargetData;
union GenericValue;
class ExecutionEngine {
Module &CurMod;
const TargetData *TD;
protected:
// GlobalAddress - A mapping between LLVM global values and their actualized
// version...
std::map<const GlobalValue*, void *> GlobalAddress;
void setTargetData(const TargetData &td) {
TD = &td;
}
public:
ExecutionEngine(Module *M) : CurMod(*M) {
assert(M && "Module is null?");
}
virtual ~ExecutionEngine();
Module &getModule() const { return CurMod; }
const TargetData &getTargetData() const { return *TD; }
/// run - Start execution with the specified function, arguments, and
/// environment.
///
virtual int run(const std::string &FnName,
const std::vector<std::string> &Args,
const char ** envp) = 0;
/// createJIT - Create an return a new JIT compiler if there is one available
/// for the current target. Otherwise it returns null.
///
static ExecutionEngine *createJIT(Module *M);
/// createInterpreter - Create a new interpreter object. This can never fail.
///
static ExecutionEngine *createInterpreter(Module *M, bool DebugMode,
bool TraceMode);
void addGlobalMapping(const Function *F, void *Addr) {
void *&CurVal = GlobalAddress[(const GlobalValue*)F];
assert(CurVal == 0 && "GlobalMapping already established!");
CurVal = Addr;
}
// getPointerToGlobalIfAvailable - This returns the address of the specified
// global value if it is available, otherwise it returns null.
//
void *getPointerToGlobalIfAvailable(const GlobalValue *GV) {
std::map<const GlobalValue*, void*>::iterator I = GlobalAddress.find(GV);
return I != GlobalAddress.end() ? I->second : 0;
}
// getPointerToGlobal - This returns the address of the specified global
// value. This may involve code generation if it's a function.
//
void *getPointerToGlobal(const GlobalValue *GV);
// getPointerToFunction - The different EE's represent function bodies in
// different ways. They should each implement this to say what a function
// pointer should look like.
//
virtual void *getPointerToFunction(Function *F) = 0;
protected:
void emitGlobals();
public: // FIXME: protected: // API shared among subclasses
GenericValue getConstantValue(const Constant *C);
void StoreValueToMemory(GenericValue Val, GenericValue *Ptr, const Type *Ty);
GenericValue LoadValueFromMemory(GenericValue *Ptr, const Type *Ty);
void *CreateArgv(const std::vector<std::string> &InputArgv);
void InitializeMemory(const Constant *Init, void *Addr);
};
#endif
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