Wire up IREE compilation and runtime in a new backend test.

* Adds python bindings for invoking flow, HAL, and VM lowering pipelines.
* Adds pythong bindings for translating to VM module flatbuffer.
* Adds a new backend_test/iree directory and configure lit to find the IREE python rt bindings.
* Open code a simple_invoke.py that exercises the whole pipeline (need real APIs for a lot of this).
* Fails when invoking the function because I never implemented argument marshaling for scalars :(
* Plenty of stuff to do tomorrow.

CMakeLists.txt

@@ -58,8 +58,9 @@ if(NPCOMP_ENABLE_IREE)
   string(APPEND NPCOMP_TABLEGEN_ARGS "-DNPCOMP_ENABLE_IREE")
   if(NPCOMP_IREE_SRCDIR)
     message(STATUS "Depending on IREE source: ${NPCOMP_IREE_SRCDIR}")
-    set(IREE_BUILD_TESTS OFF CACHE BOOL "Override IREE setting")
-    set(IREE_BUILD_SAMPLES OFF CACHE BOOL "Override IREE setting")
+    set(IREE_BUILD_TESTS OFF CACHE BOOL "Override IREE setting" FORCE)
+    set(IREE_BUILD_SAMPLES OFF CACHE BOOL "Override IREE setting" FORCE)
+    set(IREE_BUILD_PYTHON_BINDINGS ON CACHE BOOL "Override IREE setting" FORCE)
     set(IREE_MLIR_DEP_MODE "DISABLED" CACHE STRING "Override IREE setting")
     add_subdirectory("${NPCOMP_IREE_SRCDIR}" "iree" EXCLUDE_FROM_ALL)
   else()
@@ -99,3 +100,7 @@ add_subdirectory(pytest)
 add_subdirectory(runtime)
 add_subdirectory(tools)
 add_subdirectory(test)
+
+if(NPCOMP_ENABLE_IREE)
+  add_subdirectory(backend_test/iree)
+endif()

backend_test/iree/CMakeLists.txt

@@ -0,0 +1,26 @@
+configure_lit_site_cfg(
+        ${CMAKE_CURRENT_SOURCE_DIR}/lit.site.cfg.py.in
+        ${CMAKE_CURRENT_BINARY_DIR}/lit.site.cfg.py
+        MAIN_CONFIG
+        ${CMAKE_CURRENT_SOURCE_DIR}/lit.cfg.py
+)
+
+set(NPCOMP_TEST_DEPENDS
+        FileCheck count not
+        npcomp-opt
+        NPCOMPNativePyExt
+        # TODO: Fix this so it has an IREE prefix
+        bindings_python_pyiree_rt_rt
+        # TODO: Why is this separate?
+        bindings_python_pyiree_rt_system_api
+)
+
+add_lit_testsuite(check-npcomp-backend-iree-lit "Running npcomp IREE tests"
+        ${CMAKE_CURRENT_BINARY_DIR}
+        DEPENDS ${NPCOMP_TEST_DEPENDS}
+        )
+set_target_properties(check-npcomp-backend-iree-lit PROPERTIES FOLDER "Tests")
+
+add_lit_testsuites(NPCOMP_PYTEST ${CMAKE_CURRENT_SOURCE_DIR} DEPENDS ${NPCOMP_TEST_DEPENDS})
+
+add_dependencies(check-npcomp check-npcomp-backend-iree-lit)

backend_test/iree/Sample/simple_invoke.py

@@ -0,0 +1,53 @@
+# XFAIL: *
+# RUN: %PYTHON %s
+
+from npcomp.compiler.frontend import *
+from npcomp.compiler.target import *
+
+# TODO: This should all exist in a high level API somewhere.
+from _npcomp import mlir
+from _npcomp.backend import iree as ireec
+
+from pyiree import rt
+
+
+def compile_function(f):
+  fe = ImportFrontend(target_factory=GenericTarget32)
+  ir_f = fe.import_global_function(f)
+
+  input_m = fe.ir_module
+  # For easier debugging, split into to pass manager invocations.
+  pm = mlir.passes.PassManager(input_m.context)
+  # TOOD: Have an API for this
+  pm.addPassPipelines(
+    "basicpy-type-inference", "convert-basicpy-to-std", "canonicalize")
+  pm.run(input_m)
+  print("INPUT MODULE:")
+  print(input_m.to_asm())
+
+  # Main IREE compiler.
+  pm = mlir.passes.PassManager(input_m.context)
+  ireec.build_flow_transform_pass_pipeline(pm)
+  ireec.build_hal_transform_pass_pipeline(pm)
+  ireec.build_vm_transform_pass_pipeline(pm)
+  pm.run(input_m)
+  print("VM MODULE:")
+  print(input_m.to_asm())
+
+  # Translate to VM bytecode flatbuffer.
+  vm_blob = ireec.translate_to_vm_bytecode(input_m)
+  print("VM BLOB: len =", len(vm_blob))
+  return vm_blob
+
+
+def int_add(a: int, b: int):
+  return a + b
+
+vm_blob = compile_function(int_add)
+m = rt.VmModule.from_flatbuffer(vm_blob)
+config = rt.Config("vmla")
+ctx = rt.SystemContext(config=config)
+ctx.add_module(m)
+
+f = ctx.modules.module.int_add
+print(f(5, 6))

backend_test/iree/lit.cfg.py

@@ -0,0 +1,80 @@
+# -*- Python -*-
+
+import os
+import platform
+import re
+import subprocess
+import sys
+import tempfile
+
+import lit.formats
+import lit.util
+
+from lit.llvm import llvm_config
+from lit.llvm.subst import ToolSubst
+from lit.llvm.subst import FindTool
+
+# Configuration file for the 'lit' test runner.
+
+# name: The name of this test suite.
+config.name = 'NPCOMP_BACKEND_IREE'
+
+config.test_format = lit.formats.ShTest(not llvm_config.use_lit_shell)
+
+# suffixes: A list of file extensions to treat as test files.
+config.suffixes = ['.mlir', '.py']
+
+# test_source_root: The root path where tests are located.
+config.test_source_root = os.path.dirname(__file__)
+
+# test_exec_root: The root path where tests should be run.
+config.test_exec_root = os.path.join(config.npcomp_obj_root, 'backend_test', 'iree')
+
+config.substitutions.append(('%PATH%', config.environment['PATH']))
+config.substitutions.append(('%shlibext', config.llvm_shlib_ext))
+config.substitutions.append(('%PYTHON', config.python_executable))
+
+llvm_config.with_system_environment(
+    ['HOME', 'INCLUDE', 'LIB', 'NPCOMP_DEBUG', 'TMP', 'TEMP'])
+
+llvm_config.use_default_substitutions()
+
+# excludes: A list of files/directories to exclude from the testsuite. The
+# 'Inputs'subdirectories contain auxiliary inputs for various tests in their
+# parent directories.
+config.excludes = [
+    'Inputs', 'Examples', 'lit.cfg.py', 'CMakeLists.txt', 'README.txt',
+    'LICENSE.txt'
+]
+
+# test_source_root: The root path where tests are located.
+config.test_source_root = os.path.dirname(__file__)
+
+# test_exec_root: The root path where tests should be run.
+config.test_exec_root = os.path.join(config.npcomp_obj_root, 'backend_test', 'iree')
+config.npcomp_tools_dir = os.path.join(config.npcomp_obj_root, 'tools')
+config.npcomp_runtime_shlib = os.path.join(
+    config.npcomp_obj_root, 'runtime',
+    'libNPCOMPRuntime' + config.llvm_shlib_ext)
+
+# Tweak the PATH and PYTHONPATH to include the tools dir.
+llvm_config.with_environment('PATH', config.llvm_tools_dir, append_path=True)
+llvm_config.with_environment('PYTHONPATH', [
+    os.path.join(config.npcomp_obj_root, "python"),
+    os.path.join(config.npcomp_obj_root, "python_native"),
+    os.path.join(config.npcomp_obj_root, "iree", "bindings", "python"),
+],
+                             append_path=True)
+
+tool_dirs = [
+    os.path.join(config.npcomp_tools_dir, 'npcomp-opt'),
+    os.path.join(config.npcomp_tools_dir, 'npcomp-run-mlir'),
+    config.llvm_tools_dir,
+]
+tools = [
+    'npcomp-opt',
+    'npcomp-run-mlir',
+    ToolSubst('%npcomp_runtime_shlib', config.npcomp_runtime_shlib),
+]
+
+llvm_config.add_tool_substitutions(tools, tool_dirs)

backend_test/iree/lit.site.cfg.py.in

@@ -0,0 +1,49 @@
+@LIT_SITE_CFG_IN_HEADER@
+
+import sys
+
+config.host_triple = "@LLVM_HOST_TRIPLE@"
+config.target_triple = "@TARGET_TRIPLE@"
+config.llvm_src_root = "@LLVM_SOURCE_DIR@"
+config.llvm_obj_root = "@LLVM_BINARY_DIR@"
+config.llvm_tools_dir = "@LLVM_TOOLS_DIR@"
+config.llvm_lib_dir = "@LLVM_LIBRARY_DIR@"
+config.llvm_shlib_dir = "@SHLIBDIR@"
+config.llvm_shlib_ext = "@SHLIBEXT@"
+config.llvm_exe_ext = "@EXEEXT@"
+config.lit_tools_dir = "@LLVM_LIT_TOOLS_DIR@"
+config.python_executable = "@PYTHON_EXECUTABLE@"
+config.gold_executable = "@GOLD_EXECUTABLE@"
+config.ld64_executable = "@LD64_EXECUTABLE@"
+config.enable_shared = @ENABLE_SHARED@
+config.enable_assertions = @ENABLE_ASSERTIONS@
+config.targets_to_build = "@TARGETS_TO_BUILD@"
+config.native_target = "@LLVM_NATIVE_ARCH@"
+config.llvm_bindings = "@LLVM_BINDINGS@".split(' ')
+config.host_os = "@HOST_OS@"
+config.host_cc = "@HOST_CC@"
+config.host_cxx = "@HOST_CXX@"
+# Note: ldflags can contain double-quoted paths, so must use single quotes here.
+config.host_ldflags = '@HOST_LDFLAGS@'
+config.llvm_use_sanitizer = "@LLVM_USE_SANITIZER@"
+config.llvm_host_triple = '@LLVM_HOST_TRIPLE@'
+config.host_arch = "@HOST_ARCH@"
+config.npcomp_src_root = "@CMAKE_SOURCE_DIR@"
+config.npcomp_obj_root = "@CMAKE_BINARY_DIR@"
+
+# Support substitution of the tools_dir with user parameters. This is
+# used when we can't determine the tool dir at configuration time.
+try:
+    config.llvm_tools_dir = config.llvm_tools_dir % lit_config.params
+    config.llvm_shlib_dir = config.llvm_shlib_dir % lit_config.params
+except KeyError:
+    e = sys.exc_info()[1]
+    key, = e.args
+    lit_config.fatal("unable to find %r parameter, use '--param=%s=VALUE'" % (key,key))
+
+
+import lit.llvm
+lit.llvm.initialize(lit_config, config)
+
+# Let the main config do the real work.
+lit_config.load_config(config, "@CMAKE_SOURCE_DIR@/backend_test/iree/lit.cfg.py")

include/npcomp/Dialect/Basicpy/IR/BasicpyOps.td

@@ -295,6 +295,8 @@ def Basicpy_UnknownCastOp : Basicpy_Op<"unknown_cast", [NoSideEffect]> {
   let arguments = (ins AnyType:$operand);
   let results = (outs AnyType:$result);
   let assemblyFormat = "operands attr-dict `:` type(operands) `->` type(results)";
+
+  let hasCanonicalizer = 1;
 }
 
 #endif // NPCOMP_DIALECT_BASICPY_IR_BASICPY_OPS

lib/Backend/IREE/PythonModule.cpp

@@ -31,6 +31,7 @@ public:
 /// Defines an "iree" module with backend support definitions.
 void mlir::npcomp::python::defineBackendIREEModule(py::module m) {
   py::class_<Blob>(m, "Blob", py::buffer_protocol())
+      .def("__len__", [](Blob &self) { return self.contents.size(); })
       .def_buffer([](Blob &self) -> py::buffer_info {
         return py::buffer_info(
             static_cast<void *>(&self.contents.front()), // Pointer to buffer

lib/Dialect/Basicpy/IR/BasicpyOps.cpp

@@ -10,6 +10,7 @@
 #include "mlir/IR/Builders.h"
 #include "mlir/IR/FunctionImplementation.h"
 #include "mlir/IR/OpImplementation.h"
+#include "mlir/IR/PatternMatch.h"
 #include "npcomp/Dialect/Basicpy/IR/BasicpyDialect.h"
 
 #include "npcomp/Dialect/Basicpy/IR/BasicpyOpsEnums.cpp.inc"
@@ -192,6 +193,31 @@ OpFoldResult StrConstantOp::fold(ArrayRef<Attribute> operands) {
   return valueAttr();
 }
 
+//===----------------------------------------------------------------------===//
+// UnknownCastOp
+//===----------------------------------------------------------------------===//
+
+namespace {
+
+class ElideIdentityUnknownCast : public OpRewritePattern<UnknownCastOp> {
+public:
+  using OpRewritePattern::OpRewritePattern;
+  LogicalResult matchAndRewrite(UnknownCastOp op,
+                                PatternRewriter &rewriter) const {
+    if (op.operand().getType() != op.result().getType())
+      return failure();
+    rewriter.replaceOp(op, op.operand());
+    return success();
+  }
+};
+
+} // namespace
+
+void UnknownCastOp::getCanonicalizationPatterns(
+    OwningRewritePatternList &patterns, MLIRContext *context) {
+  patterns.insert<ElideIdentityUnknownCast>(context);
+}
+
 #define GET_OP_CLASSES
 #include "npcomp/Dialect/Basicpy/IR/BasicpyOps.cpp.inc"
 } // namespace Basicpy

lib/Python/MlirIr.cpp

@@ -224,17 +224,26 @@ void PyDialectHelper::bind(py::module m) {
            py::arg("attrs") = llvm::Optional<PyAttribute>())
       .def("func_op",
            [](PyDialectHelper &self, const std::string &name, PyType type,
-              bool createEntryBlock) {
+              bool createEntryBlock, llvm::Optional<PyAttribute> attrs) {
              auto functionType = type.type.dyn_cast_or_null<FunctionType>();
              if (!functionType) {
                throw py::raiseValueError("Illegal function type");
              }
              OpBuilder &opBuilder = self.pyOpBuilder.getBuilder(true);
              Location loc = self.pyOpBuilder.getCurrentLoc();
-             // TODO: Add function and arg/result attributes.
+             // TODO: Dedup attr creation from op().
+             MutableDictionaryAttr attrList;
+             if (attrs) {
+               auto dictAttrs = attrs->attr.dyn_cast<DictionaryAttr>();
+               if (!dictAttrs) {
+                 throw py::raiseValueError(
+                     "Expected `attrs` to be a DictionaryAttr");
+               }
+               attrList = MutableDictionaryAttr(dictAttrs);
+             }
              FuncOp op =
                  opBuilder.create<FuncOp>(loc, StringRef(name), functionType,
-                                          /*attrs=*/ArrayRef<NamedAttribute>());
+                                          /*attrs=*/attrList.getAttrs());
              if (createEntryBlock) {
                Block *entryBlock = new Block();
                entryBlock->addArguments(functionType.getInputs());
@@ -245,6 +254,7 @@ void PyDialectHelper::bind(py::module m) {
            },
            py::arg("name"), py::arg("type"),
            py::arg("create_entry_block") = false,
+           py::arg("attrs") = llvm::Optional<PyAttribute>(),
            R"(Creates a new `func` op, optionally creating an entry block.
               If an entry block is created, the builder will be positioned
               to its start.)")
@@ -507,7 +517,10 @@ void PyContext::bind(py::module m) {
              return createDenseElementsAttrFromBuffer(&self.context,
                                                       array_info);
            },
-           py::arg("array"));
+           py::arg("array"))
+      .def_property_readonly("unit_attr", [](PyContext &self) -> PyAttribute {
+        return UnitAttr::get(&self.context);
+      });
 }
 
 PyModuleOp PyContext::parseAsm(const std::string &asm_text) {

python/npcomp/compiler/frontend.py

@@ -105,7 +105,12 @@ class ImportFrontend:
     h.builder.set_file_line_col(filename_ident, ast_fd.lineno,
                                 ast_fd.col_offset)
     h.builder.insert_before_terminator(ir_m.first_block)
-    ir_f = h.func_op(ast_fd.name, ir_f_type, create_entry_block=True)
+    # TODO: Do not hardcode this IREE attribute.
+    attrs = ir_c.dictionary_attr({"iree.module.export": ir_c.unit_attr})
+    ir_f = h.func_op(ast_fd.name,
+                     ir_f_type,
+                     create_entry_block=True,
+                     attrs=attrs)
     fctx = FunctionContext(ir_c=ir_c,
                            ir_f=ir_f,
                            ir_h=h,

test/Dialect/Basicpy/canonicalize.mlir

@@ -0,0 +1,15 @@
+// RUN: npcomp-opt -split-input-file %s | npcomp-opt -canonicalize | FileCheck --dump-input=fail %s
+
+// CHECK-LABEL: func @unknown_cast_elide
+func @unknown_cast_elide(%arg0 : i32) -> i32 {
+  // CHECK-NOT: basicpy.unknown_cast
+  %0 = basicpy.unknown_cast %arg0 : i32 -> i32
+  return %0 : i32
+}
+
+// CHECK-LABEL: func @unknown_cast_preserve
+func @unknown_cast_preserve(%arg0 : i32) -> !basicpy.UnknownType {
+  // CHECK: basicpy.unknown_cast
+  %0 = basicpy.unknown_cast %arg0 : i32 -> !basicpy.UnknownType
+  return %0 : !basicpy.UnknownType
+}