| /* Copyright 2020 The TensorFlow Authors. All Rights Reserved. |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
| You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| ==============================================================================*/ |
| |
| #include "mlir/Dialect/Func/IR/FuncOps.h" // from @llvm-project |
| #include "mlir/IR/OperationSupport.h" // from @llvm-project |
| #include "mlir/Pass/Pass.h" // from @llvm-project |
| #include "tensorflow/compiler/mlir/lite/ir/tfl_ops.h" |
| #include "tensorflow/compiler/mlir/tensorflow/ir/tf_saved_model.h" |
| |
| namespace mlir { |
| namespace TFL { |
| namespace { |
| |
| // This pass inserts a TFL::CallOnce op when tf_saved_model's session |
| // initializer is given. |
| class InsertCallOnceOpFromSessionInitializerPass |
| : public mlir::PassWrapper<InsertCallOnceOpFromSessionInitializerPass, |
| OperationPass<ModuleOp>> { |
| public: |
| MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID( |
| InsertCallOnceOpFromSessionInitializerPass) |
| |
| private: |
| void getDependentDialects(DialectRegistry ®istry) const override { |
| registry.insert<TensorFlowLiteDialect>(); |
| } |
| |
| StringRef getArgument() const final { |
| // This is the argument used to refer to the pass in |
| // the textual format (on the commandline for example). |
| return "tfl-insert-call-once-op"; |
| } |
| StringRef getDescription() const final { |
| // This is a brief description of the pass. |
| return "Insert CallOnce op when tf_saved_model's session initializer is " |
| "given"; |
| } |
| |
| void runOnOperation() override; |
| }; |
| |
| void InsertCallOnceOpFromSessionInitializerPass::runOnOperation() { |
| ModuleOp module = getOperation(); |
| tf_saved_model::SessionInitializerOp session_init_op = |
| tf_saved_model::GetSessionInitializerOp(module); |
| |
| if (!session_init_op) return; |
| |
| SymbolTable symbol_table(module); |
| |
| for (auto sym_ref : session_init_op.initializers()) { |
| func::FuncOp init_func_op = symbol_table.lookup<mlir::func::FuncOp>( |
| sym_ref.cast<FlatSymbolRefAttr>().getValue()); |
| |
| if (!init_func_op) { |
| module.emitError("no session initializer function found"); |
| return signalPassFailure(); |
| } |
| |
| for (auto func : module.getOps<func::FuncOp>()) { |
| auto dict_attr = |
| func->getAttrOfType<mlir::DictionaryAttr>("tf.entry_function"); |
| if (!dict_attr) continue; |
| |
| OpBuilder builder(func.getContext()); |
| builder.setInsertionPointToStart(&func.getBlocks().front()); |
| builder.create<TFL::CallOnceOp>(func.getLoc(), init_func_op.getName()); |
| } |
| } |
| } |
| |
| } // namespace |
| |
| // Inserts a TFL::CallOnce op when tf_saved_model's session initializer is |
| // given. |
| std::unique_ptr<OperationPass<ModuleOp>> |
| CreateInsertCallOnceOpFromSessionInitializerPass() { |
| return std::make_unique<InsertCallOnceOpFromSessionInitializerPass>(); |
| } |
| |
| static PassRegistration<InsertCallOnceOpFromSessionInitializerPass> pass; |
| |
| } // namespace TFL |
| } // namespace mlir |