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//===----- RemoteTargetExternal.h - LLVM out-of-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 RemoteTargetExternal class which executes JITed code in a
// separate process from where it was built.
//
//===----------------------------------------------------------------------===//
#ifndef LLI_REMOTETARGETEXTERNAL_H
#define LLI_REMOTETARGETEXTERNAL_H
#include "RPCChannel.h"
#include "RemoteTarget.h"
#include "RemoteTargetMessage.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Config/config.h"
#include "llvm/Support/DataTypes.h"
#include "llvm/Support/Memory.h"
#include <stdlib.h>
#include <string>
namespace llvm {
class RemoteTargetExternal : public RemoteTarget {
RPCChannel RPC;
bool WriteBytes(const void *Data, size_t Size) {
return RPC.WriteBytes(Data, Size);
}
bool ReadBytes(void *Data, size_t Size) { return RPC.ReadBytes(Data, Size); }
public:
/// 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 True on success. On failure, ErrorMsg is updated with
/// descriptive text of the encountered error.
bool allocateSpace(size_t Size, unsigned Alignment,
uint64_t &Address) override;
/// 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 True 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) override;
/// 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 True 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) override;
/// 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 True on success. On failure, ErrorMsg is updated with
/// descriptive text of the encountered error.
bool executeCode(uint64_t Address, int &RetVal) override;
/// Minimum alignment for memory permissions. Used to separate 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() override { return 4096; }
bool create() override {
RPC.ChildName = ChildName;
if (!RPC.createServer())
return true;
// We must get Ack from the client (blocking read)
if (!Receive(LLI_ChildActive)) {
ErrorMsg += ", (RPCChannel::create) - Stopping process!";
stop();
return false;
}
return true;
}
/// Terminate the remote process.
void stop() override;
RemoteTargetExternal(std::string &Name) : RemoteTarget(), ChildName(Name) {}
virtual ~RemoteTargetExternal() {}
private:
std::string ChildName;
bool SendAllocateSpace(uint32_t Alignment, uint32_t Size);
bool SendLoadSection(uint64_t Addr,
const void *Data,
uint32_t Size,
bool IsCode);
bool SendExecute(uint64_t Addr);
bool SendTerminate();
// High-level wrappers for receiving data
bool Receive(LLIMessageType Msg);
bool Receive(LLIMessageType Msg, int32_t &Data);
bool Receive(LLIMessageType Msg, uint64_t &Data);
// Lower level target-independent read/write to deal with errors
bool ReceiveHeader(LLIMessageType Msg);
bool ReceivePayload();
bool SendHeader(LLIMessageType Msg);
bool SendPayload();
// Functions to append/retrieve data from the payload
SmallVector<const void *, 2> SendData;
SmallVector<void *, 1> ReceiveData; // Future proof
SmallVector<int, 2> Sizes;
void AppendWrite(const void *Data, uint32_t Size);
void AppendRead(void *Data, uint32_t Size);
};
} // end namespace llvm
#endif // LLI_REMOTETARGETEXTERNAL_H
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