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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 "../ExecutionEngine.h"
#include "llvm/PassManager.h"
#include <map>
class Function;
class GlobalValue;
class Constant;
class TargetMachine;
class MachineCodeEmitter;
class VM : public ExecutionEngine {
TargetMachine &TM; // The current target we are compiling to
PassManager PM; // Passes to compile a function
MachineCodeEmitter *MCE; // MCE object
// 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(Module *M, TargetMachine *tm);
~VM();
/// run - Start execution with the specified function and arguments.
///
virtual int run(const std::string &FnName,
const std::vector<std::string> &Args);
void addFunctionRef(void *Ref, Function *F) {
FunctionRefs[Ref] = F;
}
const std::string &getFunctionReferencedName(void *RefAddr);
void *resolveFunctionReference(void *RefAddr);
/// 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();
private:
static MachineCodeEmitter *createX86Emitter(VM &V);
static MachineCodeEmitter *createSparcEmitter(VM &V);
void setupPassManager();
void *getPointerToFunction(const Function *F);
void registerCallback();
/// emitStubForFunction - This method is used by the JIT when it needs to emit
/// the address of a function for a function whose code has not yet been
/// generated. In order to do this, it generates a stub which jumps to the
/// lazy function compiler, which will eventually get fixed to call the
/// function directly.
///
void *emitStubForFunction(const Function &F);
};
#endif
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