[RefBackend] Move runtime related code under npcomp/RefBackend/

Other than the dialect definitions (which will live in standard Dialect/
subdirectory), the goal here is to keep RefBackend-related code nested
in {include/npcomp,lib,test}/RefBackend.

include/npcomp/RefBackend/JITHelpers/JITModule.h

@@ -11,7 +11,7 @@
 
 #include "mlir/ExecutionEngine/ExecutionEngine.h"
 #include "mlir/IR/Module.h"
-#include "npcomp/runtime/UserAPI.h"
+#include "npcomp/RefBackend/Runtime/UserAPI.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"

include/npcomp/RefBackend/Runtime/README.md

@@ -0,0 +1,14 @@
+RefBackendRt (namespace `refbackrt`) is the runtime support library for the
+RefBackend backend.  It is best practice to keep compiler and runtime code
+totally firewalled.
+
+!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+As such, this directory should have NO DEPENDENCIES ON COMPILER CODE (no
+LLVM libSupport, etc.).
+!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+This will cause some duplication, but history has shown that this
+firewalling pays big dividends. In particular, compiler code very
+frequently has binary sizes that are simply unacceptable in runtime
+scenarios, such as MByte-sized dependencies like LLVM libSupport.
+Runtime code should fit in kBytes.

include/npcomp/RefBackend/Runtime/UserAPI.h

@@ -13,15 +13,15 @@
 // even if things superficially look similar, remember that there are no
 // LLVM utilities here, memory allocation should be kept to a minimum, etc.
 //
-// npcomp/runtime/Support.h provides some minimal LLVM-like support code to keep
+// npcomp/RefBackend/Runtime/Support.h provides some minimal LLVM-like support
-// the API familiar.
+// code to keep the API familiar.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef NPCOMP_RUNTIME_USERAPI_H
 #define NPCOMP_RUNTIME_USERAPI_H
 
-#include "npcomp/runtime/Support.h"
+#include "npcomp/RefBackend/Runtime/Support.h"
 #include <atomic>
 #include <cstdlib>
 

include/npcomp/runtime/README.md

@@ -1,13 +0,0 @@
-This directory is named `runtime` instead of `Runtime` in order to be a
-slight reminder that it is a totally separate codebase from the compiler
-code. (There is no difference in naming conventions other than this one
-directory though)
-
-It is best practice to keep compiler and runtime code totally firewalled.
-Right now, we don't have a good place to put the runtime code that fits in
-nicely with #include paths and stuff (we would like users to use something
-like `npcomp/runtime/UserAPI.h` to be the include path).
-
-We could have a top-level `runtime` directory with
-`runtime/include/npcomp/runtime/UserAPI.h` but that just felt too
-heavyweight right now.

lib/Backend/RefJIT/CMakeLists.txt

@@ -16,7 +16,7 @@ target_link_libraries(NPCOMPBackendRefJITPythonModule
   MLIRTargetLLVMIR
 
   NPCOMPPythonCommon
-  NPCOMPJITRuntime
+  NPCOMPRefBackendJITHelpers
 )
 
 npcomp_python_target_compile_options(NPCOMPBackendRefJITPythonModule)

lib/Backend/RefJIT/PythonModule.cpp

@@ -10,9 +10,9 @@
 
 #include "pybind11/numpy.h"
 
-#include "npcomp/JITRuntime/JITModule.h"
 #include "npcomp/Python/MlirIr.h"
 #include "npcomp/Python/MlirPass.h"
+#include "npcomp/RefBackend/JITHelpers/JITModule.h"
 
 using llvm::SmallVector;
 using llvm::StringRef;

lib/CMakeLists.txt

@@ -2,10 +2,8 @@ add_subdirectory(CAPI)
 add_subdirectory(Conversion)
 add_subdirectory(Dialect)
 add_subdirectory(RefBackend)
-add_subdirectory(JITRuntime)
 add_subdirectory(Python)
 add_subdirectory(Typing)
-add_subdirectory(runtime)
 
 if(NPCOMP_ENABLE_REFJIT)
   add_subdirectory(Backend/RefJIT)

lib/RefBackend/CMakeLists.txt

@@ -1,3 +1,6 @@
+add_subdirectory(Runtime)
+add_subdirectory(JITHelpers)
+
 add_mlir_library(NPCOMPRefBackend
   BypassShapes.cpp
   RefBackend.cpp

lib/RefBackend/JITHelpers/CMakeLists.txt

@@ -1,8 +1,8 @@
-add_mlir_library(NPCOMPJITRuntime
+add_mlir_library(NPCOMPRefBackendJITHelpers
   JITModule.cpp
 
   ADDITIONAL_HEADER_DIRS
-  ${PROJECT_SRC_DIR}/include/npcomp/JITRuntime
+  ${PROJECT_SRC_DIR}/include/npcomp/RefBackend/JITHelpers
 
   LINK_COMPONENTS
   Core

lib/RefBackend/JITHelpers/JITModule.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "npcomp/JITRuntime/JITModule.h"
+#include "npcomp/RefBackend/JITHelpers/JITModule.h"
 #include "mlir/ExecutionEngine/CRunnerUtils.h"
 #include "mlir/ExecutionEngine/OptUtils.h"
 #include "npcomp/RefBackend/RefBackend.h"

lib/RefBackend/Runtime/CMakeLists.txt

@@ -11,9 +11,6 @@ set(LLVM_OPTIONAL_SOURCES
 add_mlir_library(NPCOMPRuntime
   Runtime.cpp
 
-  LINK_LIBS
-  MLIRExecutionEngine
-
   EXCLUDE_FROM_LIBMLIR
 )
 

lib/RefBackend/Runtime/CompilerRuntime.cpp

@@ -16,7 +16,7 @@
 #include <iostream>
 
 #include "CompilerDataStructures.h"
-#include "npcomp/runtime/UserAPI.h"
+#include "npcomp/RefBackend/Runtime/UserAPI.h"
 
 using namespace npcomprt;
 

lib/RefBackend/Runtime/Runtime.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "npcomp/runtime/UserAPI.h"
+#include "npcomp/RefBackend/Runtime/UserAPI.h"
 
 #include <array>
 #include <cassert>

tools/mnist-playground/CMakeLists.txt

@@ -34,7 +34,7 @@ target_link_libraries(mnist-playground PRIVATE
   MLIRTargetLLVMIR
   MLIRSupport
   NPCOMPInitAll
-  NPCOMPJITRuntime
+  NPCOMPRefBackendJITHelpers
   ${conversion_libs}
   ${dialect_libs}
   ${TORCH_LIBRARIES}

tools/mnist-playground/mnist-playground.cpp

@@ -14,7 +14,7 @@
 #include "mlir/Parser.h"
 #include "mlir/Pass/PassManager.h"
 #include "npcomp/InitAll.h"
-#include "npcomp/JITRuntime/JITModule.h"
+#include "npcomp/RefBackend/JITHelpers/JITModule.h"
 #include "llvm/Support/InitLLVM.h"
 #include "llvm/Support/TargetSelect.h"
 

tools/npcomp-run-mlir/CMakeLists.txt

@@ -21,7 +21,7 @@ target_link_libraries(npcomp-run-mlir PRIVATE
   MLIRTargetLLVMIR
   MLIRSupport
   NPCOMPInitAll
-  NPCOMPJITRuntime
+  NPCOMPRefBackendJITHelpers
   ${conversion_libs}
   ${dialect_libs}
   )

tools/npcomp-run-mlir/npcomp-run-mlir.cpp

@@ -19,7 +19,7 @@
 #include "mlir/Parser.h"
 #include "mlir/Pass/PassManager.h"
 #include "npcomp/InitAll.h"
-#include "npcomp/JITRuntime/JITModule.h"
+#include "npcomp/RefBackend/JITHelpers/JITModule.h"
 #include "llvm/Support/InitLLVM.h"
 #include "llvm/Support/TargetSelect.h"