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https://github.com/c64scene-ar/llvm-6502.git
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83ece7a499
MCJIT remote execution (ChildTarget+RemoteTargetExternal) protocol was in dire need of refactoring. It was fail-prone, had no error reporting and implemented the same message logic on every single function. This patch rectifies it, and makes it work on ARM, where it was randomly failing. Other architectures shall profit from this change as well, making their buildbots and releases more reliable. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199261 91177308-0d34-0410-b5e6-96231b3b80d8
115 lines
4.0 KiB
C++
115 lines
4.0 KiB
C++
//===- RemoteTarget.h - LLVM Remote process JIT execution ----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Definition of the RemoteTarget class which executes JITed code in a
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// separate address range from where it was built.
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//
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//===----------------------------------------------------------------------===//
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#ifndef REMOTEPROCESS_H
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#define REMOTEPROCESS_H
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/Memory.h"
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#include <stdlib.h>
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#include <string>
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namespace llvm {
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class RemoteTarget {
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bool IsRunning;
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SmallVector<sys::MemoryBlock, 16> Allocations;
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protected:
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std::string ErrorMsg;
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public:
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StringRef getErrorMsg() const { return ErrorMsg; }
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/// Allocate space in the remote target address space.
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///
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/// @param Size Amount of space, in bytes, to allocate.
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/// @param Alignment Required minimum alignment for allocated space.
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/// @param[out] Address Remote address of the allocated memory.
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///
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/// @returns True on success. On failure, ErrorMsg is updated with
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/// descriptive text of the encountered error.
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virtual bool allocateSpace(size_t Size,
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unsigned Alignment,
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uint64_t &Address);
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/// Load data into the target address space.
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///
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/// @param Address Destination address in the target process.
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/// @param Data Source address in the host process.
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/// @param Size Number of bytes to copy.
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///
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/// @returns True on success. On failure, ErrorMsg is updated with
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/// descriptive text of the encountered error.
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virtual bool loadData(uint64_t Address,
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const void *Data,
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size_t Size);
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/// Load code into the target address space and prepare it for execution.
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///
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/// @param Address Destination address in the target process.
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/// @param Data Source address in the host process.
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/// @param Size Number of bytes to copy.
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///
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/// @returns True on success. On failure, ErrorMsg is updated with
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/// descriptive text of the encountered error.
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virtual bool loadCode(uint64_t Address,
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const void *Data,
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size_t Size);
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/// Execute code in the target process. The called function is required
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/// to be of signature int "(*)(void)".
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///
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/// @param Address Address of the loaded function in the target
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/// process.
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/// @param[out] RetVal The integer return value of the called function.
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///
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/// @returns True on success. On failure, ErrorMsg is updated with
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/// descriptive text of the encountered error.
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virtual bool executeCode(uint64_t Address,
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int &RetVal);
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/// Minimum alignment for memory permissions. Used to seperate code and
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/// data regions to make sure data doesn't get marked as code or vice
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/// versa.
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///
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/// @returns Page alignment return value. Default of 4k.
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virtual unsigned getPageAlignment() { return 4096; }
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/// Start the remote process.
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virtual bool create();
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/// Terminate the remote process.
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virtual void stop();
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RemoteTarget() : IsRunning(false), ErrorMsg("") {}
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virtual ~RemoteTarget() { if (IsRunning) stop(); }
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// Create an instance of the system-specific remote target class.
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static RemoteTarget *createRemoteTarget();
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static RemoteTarget *createExternalRemoteTarget(std::string &ChildName);
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static bool hostSupportsExternalRemoteTarget();
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private:
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// Main processing function for the remote target process. Command messages
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// are received on file descriptor CmdFD and responses come back on OutFD.
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static void doRemoteTargeting(int CmdFD, int OutFD);
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};
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} // end namespace llvm
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#endif
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