[FFI][REFACTOR] Establish tvm_ffi as a standalone python module

This PR establishes tvm_ffi as a standalone python module.
The ffi is structured as a minimal pip module that can be
directly install by path or url.

examples/get_started provided a minimal example.
This is a major change as we are decoupling tvm_ffi as a
separate package, users need to install tvm_ffi separately.

Thanks to its minimal dependency, tvm_ffi can be easily installed
even just from the source by pip install ./ffi

This change would enable future improvement for library plugins
to have lightweight dependencies by just working on top of
the tvm_ffi, while the main compiler toolchain and runtime
can be layered on top.

Author: tqchen

.github/actions/setup/action.yml

@@ -36,3 +36,7 @@ runs:
       mamba list
       mamba info --envs
       mamba list --name base
+  - name: Install tvm-ffi pip package
+    shell: bash -l {0}
+    run: |
+      pip install -v ./ffi

.gitmodules

@@ -1,14 +1,11 @@
 [submodule "dmlc-core"]
 	path = 3rdparty/dmlc-core
 	url = https://github.com/dmlc/dmlc-core.git
-[submodule "dlpack"]
-	path = 3rdparty/dlpack
-	url = https://github.com/dmlc/dlpack.git
 [submodule "3rdparty/rang"]
 	path = 3rdparty/rang
 	url = https://github.com/agauniyal/rang.git
 [submodule "3rdparty/libbacktrace"]
-	path = 3rdparty/libbacktrace
+	path = ffi/3rdparty/libbacktrace
 	url = https://github.com/tlc-pack/libbacktrace.git
 [submodule "3rdparty/cutlass"]
 	path = 3rdparty/cutlass

3rdparty/dlpack

@@ -76,7 +76,6 @@ tvm_option(USE_ALTERNATIVE_LINKER "Use 'mold' or 'lld' if found when invoking co
 tvm_option(USE_CCACHE "Use ccache if found when invoking compiler" AUTO)
 
 # 3rdparty libraries
-tvm_option(DLPACK_PATH "Path to DLPACK" "3rdparty/dlpack/include")
 tvm_option(DMLC_PATH "Path to DMLC" "3rdparty/dmlc-core/include")
 tvm_option(RANG_PATH "Path to RANG" "3rdparty/rang/include")
 tvm_option(COMPILER_RT_PATH "Path to COMPILER-RT" "3rdparty/compiler-rt")
@@ -125,7 +124,6 @@ tvm_option(USE_NVSHMEM "Build with NVSHMEM support" OFF)
 # include directories
 include_directories(${CMAKE_INCLUDE_PATH})
 include_directories("include")
-include_directories(SYSTEM ${DLPACK_PATH})
 include_directories(SYSTEM ${DMLC_PATH})
 include_directories(SYSTEM ${RANG_PATH})
 include_directories(SYSTEM ${COMPILER_RT_PATH})
@@ -501,7 +499,7 @@ if(NOT BUILD_DUMMY_LIBTVM)
     $<TARGET_OBJECTS:tvm_libinfo_objs>
     ${TVM_RUNTIME_EXT_OBJS}
   )
-
+  target_link_libraries(tvm PUBLIC tvm_ffi_shared)
 else()
   # dummy version of libtvm that can be used by downstream to specify dependencies
   # the real runner still need a full version of libtvm
@@ -510,6 +508,7 @@ else()
     $<TARGET_OBJECTS:tvm_libinfo_objs>
     ${TVM_RUNTIME_EXT_OBJS}
   )
+  target_link_libraries(tvm PUBLIC tvm_ffi_shared)
 endif()
 
 target_include_directories(tvm PUBLIC "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>")
@@ -519,7 +518,6 @@ if(BUILD_STATIC_RUNTIME)
   add_library(tvm_runtime STATIC
     $<TARGET_OBJECTS:tvm_runtime_objs>
     $<TARGET_OBJECTS:tvm_libinfo_objs>
-    $<TARGET_OBJECTS:tvm_ffi_objs>
     ${TVM_RUNTIME_EXT_OBJS}
   )
   set(NOTICE_MULTILINE
@@ -528,13 +526,15 @@ if(BUILD_STATIC_RUNTIME)
   string(CONCAT NOTICE ${NOTICE_MULTILINE})
   add_custom_command(TARGET tvm_runtime POST_BUILD
     COMMAND ${CMAKE_COMMAND} -E cmake_echo_color --yellow --bold ${NOTICE})
+  target_link_libraries(tvm_runtime PUBLIC tvm_ffi_static)
 else()
   add_library(tvm_runtime SHARED
     $<TARGET_OBJECTS:tvm_runtime_objs>
     $<TARGET_OBJECTS:tvm_libinfo_objs>
     ${TVM_RUNTIME_EXT_OBJS}
   )
   set_property(TARGET tvm_runtime APPEND PROPERTY LINK_OPTIONS "${TVM_NO_UNDEFINED_SYMBOLS}")
+  target_link_libraries(tvm_runtime PUBLIC tvm_ffi_shared)
 endif()
 
 
@@ -602,10 +602,6 @@ endif()
 target_link_libraries(tvm PRIVATE ${TVM_RUNTIME_LINKER_LIBS})
 target_link_libraries(tvm_runtime PRIVATE ${TVM_RUNTIME_LINKER_LIBS})
 
-target_link_libraries(tvm PUBLIC tvm_ffi_objs)
-target_link_libraries(tvm_runtime PUBLIC tvm_ffi_objs)
-
-
 if(BUILD_FOR_HEXAGON AND DEFINED USE_HEXAGON_GTEST AND EXISTS ${USE_HEXAGON_GTEST})
   include(FetchContent)
   FetchContent_Declare(googletest SOURCE_DIR "${USE_HEXAGON_GTEST}")
@@ -633,6 +629,7 @@ if (HIDE_PRIVATE_SYMBOLS AND NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
   add_library(tvm_allvisible SHARED $<TARGET_OBJECTS:tvm_objs> $<TARGET_OBJECTS:tvm_runtime_objs> $<TARGET_OBJECTS:tvm_libinfo_objs>)
   target_include_directories(tvm_allvisible PUBLIC "$<TARGET_PROPERTY:tvm,INCLUDE_DIRECTORIES>")
   target_link_libraries(tvm_allvisible PRIVATE "$<TARGET_PROPERTY:tvm,LINK_LIBRARIES>")
+  target_link_libraries(tvm_allvisible PUBLIC tvm_ffi_shared)
   set(TVM_TEST_LIBRARY_NAME tvm_allvisible)
 
   set(HIDE_SYMBOLS_LINKER_FLAGS "-Wl,--exclude-libs,ALL")
@@ -643,7 +640,6 @@ if (HIDE_PRIVATE_SYMBOLS AND NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
   target_link_libraries(tvm_runtime PRIVATE ${HIDE_SYMBOLS_LINKER_FLAGS})
   target_compile_definitions(tvm_allvisible PUBLIC $<TARGET_PROPERTY:tvm,INTERFACE_COMPILE_DEFINITONS>)
   target_compile_definitions(tvm_allvisible PRIVATE $<TARGET_PROPERTY:tvm,COMPILE_DEFINITONS>)
-  target_link_libraries(tvm_allvisible PUBLIC tvm_ffi_objs)
 endif()
 
 # Create the `cpptest` target if we can find GTest.  If not, we create dummy
@@ -687,19 +683,6 @@ endif()
 # Custom targets
 add_custom_target(runtime DEPENDS tvm_runtime)
 
-# By default add cython to all build
-find_package(Python)
-if(NOT DEFINED ENV{CONDA_BUILD})
-  message(STATUS ${CMAKE_CURRENT_BINARY_DIR})
-  add_custom_target(
-    tvm_cython ALL
-    ${Python_EXECUTABLE} setup.py build_ext --inplace
-    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/python
-  )
-  add_dependencies(tvm_cython tvm)
-  message("Add Cython build into the default build step")
-endif()
-
 # Installation rules
 install(TARGETS tvm DESTINATION lib${LIB_SUFFIX})
 install(TARGETS tvm_runtime DESTINATION lib${LIB_SUFFIX})
@@ -713,11 +696,6 @@ if (INSTALL_DEV)
     FILES_MATCHING
     PATTERN "*.h"
   )
-  install(
-    DIRECTORY "3rdparty/dlpack/include/" DESTINATION "include"
-    FILES_MATCHING
-    PATTERN "*.h"
-    )
   install(
     DIRECTORY "3rdparty/dmlc-core/include/" DESTINATION "include"
     FILES_MATCHING
@@ -779,8 +757,8 @@ if(TVM_IS_DEBUG_BUILD)
   endif()
 endif()
 
-add_dsymutil(tvm)
-add_dsymutil(tvm_runtime)
+tvm_ffi_add_apple_dsymutil(tvm)
+tvm_ffi_add_apple_dsymutil(tvm_runtime)
 
 if(BUILD_FOR_HEXAGON)
   # Wrap pthread_create to allow setting custom stack size.
@@ -789,7 +767,8 @@ if(BUILD_FOR_HEXAGON)
   # Link tvm_runtime into the RPC skel library. Make sure it's built
   # as a part of the "runtime" target.
   if(USE_HEXAGON_RPC)
-    target_link_libraries(hexagon_rpc_skel -Wl,--whole-archive tvm_runtime -Wl,--no-whole-archive)
+    target_link_libraries(
+      hexagon_rpc_skel -Wl,--whole-archive tvm_runtime tvm_ffi_static -Wl,--no-whole-archive)
     add_dependencies(runtime hexagon_rpc_skel)
   endif()
 endif()

CMakeLists.txt

@@ -37,7 +37,7 @@ TVM_BUILD_PATH := $(abspath $(TVM_BUILD_PATH))
 # Allow environment variables for 3rd-party libraries, default to
 # packaged version.
 DMLC_CORE_PATH ?= $(ROOTDIR)/3rdparty/dmlc-core
-DLPACK_PATH ?= $(ROOTDIR)/3rdparty/dlpack
+DLPACK_PATH ?= $(ROOTDIR)/ffi/3rdparty/dlpack
 
 all: $(addsuffix /all,$(TVM_BUILD_PATH))
 
@@ -107,16 +107,6 @@ mypy:
 cppdoc:
 	doxygen docs/Doxyfile
 
-
-# Cython build
-cython cython3:
-	cd python; python3 setup.py build_ext --inplace
-
-cyclean:
-	rm -rf python/tvm/*/*/*.so python/tvm/*/*/*.dylib python/tvm/*/*/*.cpp
-
-
-
 # EMCC; Web related scripts
 web:
 	$(MAKE) -C $(ROOTDIR)/web

Makefile

@@ -45,10 +45,11 @@ endif()
 target_include_directories(
   tvm_rpc
   PUBLIC "../../include"
-  PUBLIC DLPACK_PATH
   PUBLIC DMLC_PATH
 )
 
+target_link_libraries(tvm_rpc PUBLIC tvm_ffi_header)
+
 if (BUILD_FOR_ANDROID AND USE_HEXAGON)
   get_hexagon_sdk_property("${USE_HEXAGON_SDK}" "${USE_HEXAGON_ARCH}"
     DSPRPC_LIB DSPRPC_LIB_DIRS
@@ -62,9 +63,9 @@ if (BUILD_FOR_ANDROID AND USE_HEXAGON)
 endif()
 
 if(BUILD_STATIC_RUNTIME)
-  list(APPEND TVM_RPC_LINKER_LIBS -Wl,--whole-archive tvm_runtime -Wl,--no-whole-archive)
+  list(APPEND TVM_RPC_LINKER_LIBS -Wl,--whole-archive tvm_runtime tvm_ffi_static -Wl,--no-whole-archive)
 else()
   list(APPEND TVM_RPC_LINKER_LIBS tvm_runtime)
 endif()
 
-target_link_libraries(tvm_rpc ${TVM_RPC_LINKER_LIBS})
+target_link_libraries(tvm_rpc PRIVATE ${TVM_RPC_LINKER_LIBS})

apps/cpp_rpc/CMakeLists.txt

@@ -30,7 +30,12 @@
     # runtime files
     "tvm_runtime": ["build/libtvm_runtime.so", "build/config.cmake"],
     # compiler files
-    "tvm_lib": ["build/libtvm.so", "build/libtvm_runtime.so", "build/config.cmake"],
+    "tvm_lib": [
+        "build/libtvm.so",
+        "build/libtvm_runtime.so",
+        "build/lib/libtvm_ffi.so",
+        "build/config.cmake",
+    ],
     # gpu related compiler files
     "tvm_lib_gpu_extra": [
         "build/3rdparty/libflash_attn/src/libflash_attn.so",