1 /* Copyright 2022 The TensorFlow Authors. All Rights Reserved. 2 3 Licensed under the Apache License, Version 2.0 (the "License"); 4 you may not use this file except in compliance with the License. 5 You may obtain a copy of the License at 6 7 http://www.apache.org/licenses/LICENSE-2.0 8 9 Unless required by applicable law or agreed to in writing, software 10 distributed under the License is distributed on an "AS IS" BASIS, 11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 See the License for the specific language governing permissions and 13 limitations under the License. 14 ==============================================================================*/ 15 16 #include "tensorflow/core/transforms/func_to_graph/pass.h" 17 18 #include "mlir/IR/BuiltinAttributes.h" // from @llvm-project 19 #include "mlir/IR/SymbolTable.h" // from @llvm-project 20 #include "mlir/Pass/Pass.h" // from @llvm-project 21 #include "tensorflow/core/ir/ops.h" 22 #include "tensorflow/core/transforms/func_to_graph/func_to_graph.h" 23 #include "tensorflow/core/transforms/pass_detail.h" 24 25 namespace mlir { 26 namespace tfg { 27 namespace { 28 class FuncToGraphPass : public FuncToGraphBase<FuncToGraphPass> { 29 public: 30 FuncToGraphPass() = default; 31 32 // This will try to lower the function that has attribute 33 // `tfg.lifted_graph_version` to a graph. It replaces all the uses of 34 // arguments with related op results. The relation between args and ops is 35 // identified by the tfg.name attr. The arg's tfg.name attr will be prefixed 36 // with the related op's tfg.name. Besides, The ReturnOp will be dropped 37 // directly. 38 void runOnOperation() override; 39 }; 40 } // namespace 41 runOnOperation()42void FuncToGraphPass::runOnOperation() { 43 ModuleOp module = getOperation(); 44 45 auto *dialect = getContext().getLoadedDialect<TFGraphDialect>(); 46 StringAttr lifted_graph_func_name = 47 dialect->getLiftedGraphFuncNameAttrIdentifier(); 48 49 GraphFuncOp lifted_graph_func; 50 for (auto func : module.getOps<GraphFuncOp>()) { 51 if (func.sym_name() == lifted_graph_func_name) { 52 lifted_graph_func = func; 53 break; 54 } 55 } 56 57 if (!lifted_graph_func) return; 58 59 auto status = FuncToGraph(lifted_graph_func); 60 if (!status.ok()) { 61 emitError(lifted_graph_func.getLoc()) 62 << "FuncToGraph failed: " << status.error_message(); 63 signalPassFailure(); 64 } 65 } 66 CreateFuncToGraphPass()67std::unique_ptr<Pass> CreateFuncToGraphPass() { 68 return std::make_unique<FuncToGraphPass>(); 69 } 70 71 } // namespace tfg 72 } // namespace mlir 73