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//===- RemoteTarget.h - LLVM Remote process JIT execution ----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Definition of the RemoteTarget class which executes JITed code in a
// separate address range from where it was built.
//
//===----------------------------------------------------------------------===//
#ifndef REMOTEPROCESS_H
#define REMOTEPROCESS_H
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/DataTypes.h"
#include "llvm/Support/Memory.h"
#include <stdlib.h>
#include <string>
namespace llvm {
class RemoteTarget {
std::string ErrorMsg;
bool IsRunning;
SmallVector<sys::MemoryBlock, 16> Allocations;
public:
StringRef getErrorMsg() const { return ErrorMsg; }
/// Allocate space in the remote target address space.
///
/// @param Size Amount of space, in bytes, to allocate.
/// @param Alignment Required minimum alignment for allocated space.
/// @param[out] Address Remote address of the allocated memory.
///
/// @returns False on success. On failure, ErrorMsg is updated with
/// descriptive text of the encountered error.
bool allocateSpace(size_t Size, unsigned Alignment, uint64_t &Address);
/// Load data into the target address space.
///
/// @param Address Destination address in the target process.
/// @param Data Source address in the host process.
/// @param Size Number of bytes to copy.
///
/// @returns False on success. On failure, ErrorMsg is updated with
/// descriptive text of the encountered error.
bool loadData(uint64_t Address, const void *Data, size_t Size);
/// Load code into the target address space and prepare it for execution.
///
/// @param Address Destination address in the target process.
/// @param Data Source address in the host process.
/// @param Size Number of bytes to copy.
///
/// @returns False on success. On failure, ErrorMsg is updated with
/// descriptive text of the encountered error.
bool loadCode(uint64_t Address, const void *Data, size_t Size);
/// Execute code in the target process. The called function is required
/// to be of signature int "(*)(void)".
///
/// @param Address Address of the loaded function in the target
/// process.
/// @param[out] RetVal The integer return value of the called function.
///
/// @returns False on success. On failure, ErrorMsg is updated with
/// descriptive text of the encountered error.
bool executeCode(uint64_t Address, int &RetVal);
/// Minimum alignment for memory permissions. Used to seperate code and
/// data regions to make sure data doesn't get marked as code or vice
/// versa.
///
/// @returns Page alignment return value. Default of 4k.
unsigned getPageAlignment() { return 4096; }
/// Start the remote process.
void create();
/// Terminate the remote process.
void stop();
RemoteTarget() : ErrorMsg(""), IsRunning(false) {}
~RemoteTarget() { if (IsRunning) stop(); }
private:
// Main processing function for the remote target process. Command messages
// are received on file descriptor CmdFD and responses come back on OutFD.
static void doRemoteTargeting(int CmdFD, int OutFD);
};
} // end namespace llvm
#endif
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