Adding out-of-process execution support to lli.

At this time only Unix-based systems are supported.  Windows has stubs and should re-route to the simulated mode.

Thanks to Sriram Murali for contributions to this patch.




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191843 91177308-0d34-0410-b5e6-96231b3b80d8

tools/lli/RemoteTargetExternal.h

@@ -0,0 +1,118 @@
+//===----- 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 "llvm/Config/config.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>
+
+#include "RemoteTarget.h"
+#include "RemoteTargetMessage.h"
+
+namespace llvm {
+
+class RemoteTargetExternal : public RemoteTarget {
+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 False on success. On failure, ErrorMsg is updated with
+  ///          descriptive text of the encountered error.
+  virtual 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.
+  virtual 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.
+  virtual 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.
+  virtual 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.
+  virtual unsigned getPageAlignment() { return 4096; }
+
+  /// Start the remote process.
+  virtual void create();
+
+  /// Terminate the remote process.
+  virtual void stop();
+
+  RemoteTargetExternal(std::string &Name) : RemoteTarget(), ChildName(Name) {}
+  virtual ~RemoteTargetExternal() {}
+
+private:
+  std::string ChildName;
+
+  // This will get filled in as a point to an OS-specific structure.
+  void *ConnectionData;
+
+  void SendAllocateSpace(uint32_t Alignment, uint32_t Size);
+  void SendLoadSection(uint64_t Addr,
+                       const void *Data,
+                       uint32_t Size,
+                       bool IsCode);
+  void SendExecute(uint64_t Addr);
+  void SendTerminate();
+
+  void Receive(LLIMessageType Msg);
+  void Receive(LLIMessageType Msg, int &Data);
+  void Receive(LLIMessageType Msg, uint64_t &Data);
+
+  int WriteBytes(const void *Data, size_t Size);
+  int ReadBytes(void *Data, size_t Size);
+  void Wait();
+};
+
+} // end namespace llvm
+
+#endif // LLI_REMOTETARGETEXTERNAL_H