forked from OSchip/llvm-project
86 lines
3.1 KiB
C++
86 lines
3.1 KiB
C++
//===---- RemoteTargetMessage.h - LLI out-of-process message protocol -----===//
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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 LLIMessageType enum which is used for communication with a
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// child process for remote execution.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLI_REMOTETARGETMESSAGE_H
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#define LLI_REMOTETARGETMESSAGE_H
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namespace llvm {
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// LLI messages from parent-to-child or vice versa follow an exceedingly simple
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// protocol where the first four bytes represent the message type, the next
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// four bytes represent the size of data for the command and following bytes
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// represent the actual data.
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//
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// The protocol is not intended to be robust, secure or fault-tolerant. It is
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// only here for testing purposes and is therefore intended to be the simplest
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// implementation that will work. It is assumed that the parent and child
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// share characteristics like endianness.
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//
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// Quick description of the protocol:
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//
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// { Header + Payload Size + Payload }
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//
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// The protocol message consist of a header, the payload size (which can be
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// zero), and the payload itself. The payload can contain any number of items,
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// and the size has to be the sum of them all. Each end is responsible for
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// reading/writing the correct number of items with the correct sizes.
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//
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// The current four known exchanges are:
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//
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// * Allocate Space:
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// Parent: { LLI_AllocateSpace, 8, Alignment, Size }
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// Child: { LLI_AllocationResult, 8, Address }
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//
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// * Load Data:
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// Parent: { LLI_LoadDataSection, 8+Size, Address, Data }
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// Child: { LLI_LoadComplete, 4, StatusCode }
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//
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// * Load Code:
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// Parent: { LLI_LoadCodeSection, 8+Size, Address, Code }
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// Child: { LLI_LoadComplete, 4, StatusCode }
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//
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// * Execute Code:
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// Parent: { LLI_Execute, 8, Address }
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// Child: { LLI_ExecutionResult, 4, Result }
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//
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// It is the responsibility of either side to check for correct headers,
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// sizes and payloads, since any inconsistency would misalign the pipe, and
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// result in data corruption.
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enum LLIMessageType {
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LLI_Error = -1,
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LLI_ChildActive = 0, // Data = not used
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LLI_AllocateSpace, // Data = struct { uint32_t Align, uint_32t Size }
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LLI_AllocationResult, // Data = uint64_t Address (child memory space)
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LLI_LoadCodeSection, // Data = uint64_t Address, void * SectionData
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LLI_LoadDataSection, // Data = uint64_t Address, void * SectionData
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LLI_LoadResult, // Data = uint32_t LLIMessageStatus
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LLI_Execute, // Data = uint64_t Address
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LLI_ExecutionResult, // Data = uint32_t Result
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LLI_Terminate // Data = not used
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};
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enum LLIMessageStatus {
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LLI_Status_Success = 0, // Operation succeeded
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LLI_Status_NotAllocated, // Address+Size not allocated in child space
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LLI_Status_IncompleteMsg // Size received doesn't match request
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};
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} // end namespace llvm
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#endif
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