Break out OrcError and RPC

Summary:
When createing an ORC remote JIT target the current library split forces the target process to link large portions of LLVM (Core, Execution Engine, JITLink, Object, MC, Passes, RuntimeDyld, Support, Target, and TransformUtils). This occurs because the ORC RPC interfaces rely on the static globals the ORC Error types require, which starts a cycle of pulling in more and more.

This patch breaks the ORC RPC Error implementations out into an "OrcError" library which only depends on LLVM Support. It also pulls the ORC RPC headers into their own subdirectory.

With this patch code can include the Orc/RPC/*.h headers and will only incur link dependencies on LLVMOrcError and LLVMSupport.

Reviewers: lhames

Reviewed By: lhames

Subscribers: mgorny, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D68732

Author: llvm-beanz

llvm/examples/Kaleidoscope/BuildingAJIT/Chapter5/RemoteJITUtils.h

@@ -13,7 +13,7 @@
 #ifndef LLVM_TOOLS_LLI_REMOTEJITUTILS_H
 #define LLVM_TOOLS_LLI_REMOTEJITUTILS_H
 
-#include "llvm/ExecutionEngine/Orc/RawByteChannel.h"
+#include "llvm/ExecutionEngine/Orc/RPC/RawByteChannel.h"
 #include "llvm/Support/Error.h"
 #include <cassert>
 #include <cerrno>

llvm/include/llvm/ExecutionEngine/Orc/OrcRemoteTargetRPCAPI.h

@@ -16,8 +16,8 @@
 #define LLVM_EXECUTIONENGINE_ORC_ORCREMOTETARGETRPCAPI_H
 
 #include "llvm/ExecutionEngine/JITSymbol.h"
-#include "llvm/ExecutionEngine/Orc/RPCUtils.h"
-#include "llvm/ExecutionEngine/Orc/RawByteChannel.h"
+#include "llvm/ExecutionEngine/Orc/RPC/RPCUtils.h"
+#include "llvm/ExecutionEngine/Orc/RPC/RawByteChannel.h"
 
 namespace llvm {
 namespace orc {

llvm/include/llvm/ExecutionEngine/Orc/RPCSerialization.h llvm/include/llvm/ExecutionEngine/Orc/RPC/RPCSerialization.h

@@ -1,4 +1,4 @@
-//===- llvm/ExecutionEngine/Orc/RPCSerialization.h --------------*- C++ -*-===//
+//===- llvm/ExecutionEngine/Orc/RPC/RPCSerialization.h --------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
@@ -9,7 +9,7 @@
 #ifndef LLVM_EXECUTIONENGINE_ORC_RPCSERIALIZATION_H
 #define LLVM_EXECUTIONENGINE_ORC_RPCSERIALIZATION_H
 
-#include "OrcError.h"
+#include "llvm/ExecutionEngine/Orc/OrcError.h"
 #include "llvm/Support/thread.h"
 #include <map>
 #include <mutex>

llvm/include/llvm/ExecutionEngine/Orc/RPCUtils.h llvm/include/llvm/ExecutionEngine/Orc/RPC/RPCUtils.h

@@ -23,7 +23,7 @@
 
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ExecutionEngine/Orc/OrcError.h"
-#include "llvm/ExecutionEngine/Orc/RPCSerialization.h"
+#include "llvm/ExecutionEngine/Orc/RPC/RPCSerialization.h"
 #include "llvm/Support/MSVCErrorWorkarounds.h"
 
 #include <future>

llvm/include/llvm/ExecutionEngine/Orc/RawByteChannel.h llvm/include/llvm/ExecutionEngine/Orc/RPC/RawByteChannel.h

@@ -1,4 +1,4 @@
-//===- llvm/ExecutionEngine/Orc/RawByteChannel.h ----------------*- C++ -*-===//
+//===- llvm/ExecutionEngine/Orc/RPC/RawByteChannel.h ----------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
@@ -10,7 +10,7 @@
 #define LLVM_EXECUTIONENGINE_ORC_RAWBYTECHANNEL_H
 
 #include "llvm/ADT/StringRef.h"
-#include "llvm/ExecutionEngine/Orc/RPCSerialization.h"
+#include "llvm/ExecutionEngine/Orc/RPC/RPCSerialization.h"
 #include "llvm/Support/Endian.h"
 #include "llvm/Support/Error.h"
 #include <cstdint>

llvm/lib/ExecutionEngine/CMakeLists.txt

@@ -21,6 +21,7 @@ endif()
 add_subdirectory(Interpreter)
 add_subdirectory(JITLink)
 add_subdirectory(MCJIT)
+add_subdirectory(OrcError)
 add_subdirectory(Orc)
 add_subdirectory(RuntimeDyld)
 

llvm/lib/ExecutionEngine/LLVMBuild.txt

@@ -16,7 +16,7 @@
 
 [common]
 subdirectories = Interpreter MCJIT JITLink RuntimeDyld IntelJITEvents
-                 OProfileJIT Orc PerfJITEvents
+                 OProfileJIT Orc OrcError PerfJITEvents
 
 [component_0]
 type = Library

llvm/lib/ExecutionEngine/Orc/CMakeLists.txt

@@ -16,9 +16,7 @@ add_llvm_library(LLVMOrcJIT
   ObjectTransformLayer.cpp
   OrcABISupport.cpp
   OrcCBindings.cpp
-  OrcError.cpp
   OrcMCJITReplacement.cpp
-  RPCUtils.cpp
   RTDyldObjectLinkingLayer.cpp
   ThreadSafeModule.cpp
   Speculation.cpp

llvm/lib/ExecutionEngine/Orc/LLVMBuild.txt

@@ -18,5 +18,5 @@
 type = Library
 name = OrcJIT
 parent = ExecutionEngine
-required_libraries = Core ExecutionEngine JITLink Object MC Passes RuntimeDyld
-                     Support Target TransformUtils
+required_libraries = Core ExecutionEngine JITLink Object OrcError MC Passes
+                     RuntimeDyld Support Target TransformUtils

llvm/lib/ExecutionEngine/OrcError/CMakeLists.txt

@@ -0,0 +1,6 @@
+add_llvm_library(LLVMOrcError
+  OrcError.cpp
+  RPCError.cpp
+  ADDITIONAL_HEADER_DIRS
+  ${LLVM_MAIN_INCLUDE_DIR}/llvm/ExecutionEngine/Orc
+  )

llvm/lib/ExecutionEngine/OrcError/LLVMBuild.txt

@@ -0,0 +1,21 @@
+;===- ./lib/ExecutionEngine/OrcError/LLVMBuild.txt -------------*- Conf -*--===;
+;
+; Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+; See https://llvm.org/LICENSE.txt for license information.
+; SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+;
+;===------------------------------------------------------------------------===;
+;
+; This is an LLVMBuild description file for the components in this subdirectory.
+;
+; For more information on the LLVMBuild system, please see:
+;
+;   http://llvm.org/docs/LLVMBuild.html
+;
+;===------------------------------------------------------------------------===;
+
+[component_0]
+type = Library
+name = OrcError
+parent = ExecutionEngine
+required_libraries = Support

llvm/lib/ExecutionEngine/Orc/OrcError.cpp llvm/lib/ExecutionEngine/OrcError/OrcError.cpp

@@ -1,16 +1,16 @@
-//===--------------- RPCUtils.cpp - RPCUtils implementation ---------------===//
+//===--------------- RPCError.cpp - RPCERror implementation ---------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// RPCUtils implementation.
+// RPC Error type implmentations.
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/ExecutionEngine/Orc/RPCUtils.h"
+#include "llvm/ExecutionEngine/Orc/RPC/RPCUtils.h"
 
 char llvm::orc::rpc::RPCFatalError::ID = 0;
 char llvm::orc::rpc::ConnectionClosed::ID = 0;

llvm/lib/ExecutionEngine/Orc/RPCUtils.cpp llvm/lib/ExecutionEngine/OrcError/RPCError.cpp

@@ -13,7 +13,7 @@
 #ifndef LLVM_TOOLS_LLI_REMOTEJITUTILS_H
 #define LLVM_TOOLS_LLI_REMOTEJITUTILS_H
 
-#include "llvm/ExecutionEngine/Orc/RawByteChannel.h"
+#include "llvm/ExecutionEngine/Orc/RPC/RawByteChannel.h"
 #include "llvm/ExecutionEngine/RTDyldMemoryManager.h"
 #include <mutex>
 

llvm/tools/lli/RemoteJITUtils.h

@@ -9,7 +9,7 @@
 #ifndef LLVM_UNITTESTS_EXECUTIONENGINE_ORC_QUEUECHANNEL_H
 #define LLVM_UNITTESTS_EXECUTIONENGINE_ORC_QUEUECHANNEL_H
 
-#include "llvm/ExecutionEngine/Orc/RawByteChannel.h"
+#include "llvm/ExecutionEngine/Orc/RPC/RawByteChannel.h"
 #include "llvm/Support/Error.h"
 
 #include <atomic>

llvm/unittests/ExecutionEngine/Orc/QueueChannel.h

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/ExecutionEngine/Orc/RPCUtils.h"
+#include "llvm/ExecutionEngine/Orc/RPC/RPCUtils.h"
 #include "QueueChannel.h"
 #include "gtest/gtest.h"