/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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. */ /*! * Copyright (c) 2018 by Contributors. * * \file tvm/relay/pass/pass_util.h * \brief Utilities for writing passes */ #ifndef TVM_RELAY_PASS_PASS_UTIL_H_ #define TVM_RELAY_PASS_PASS_UTIL_H_ #include <tvm/relay/op.h> #include <tvm/relay/expr.h> #include <tvm/relay/attrs/transform.h> #include <memory> #include <unordered_map> namespace tvm { namespace relay { /*! * \brief Get reference counter of each internal ExprNode in body. * \param body The body expression. * \return The reference count mapping. */ std::unordered_map<const Node*, size_t> GetExprRefCount(const Expr& body); /*! * \brief Check if expr is positive constant. * \param expr The expression to be checked. * \return Whether all elements of expr is positive constant. */ bool IsAllPositiveConstant(const Expr& expr); /*! * \brief Substitute var with subst. * \param type The type to be substituted. * \param tvar The type variable to be substituted. * \param subst The target of substitution. * \return The substituted result. */ Type TypeSubst(const Type& type, const TypeVar& tvar, const Type& subst); /*! * \brief Substitute var with subst. * \param expr The expr to be substituted. * \param tvar The type variable to be substituted. * \param subst The target of substitution. * \return The substituted result. */ Expr TypeSubst(const Expr& expr, const TypeVar& tvar, const Type& subst); /*! * \brief Substitute type vars in type. * \param type The type to be substituted. * \param subst_map The map of substitution. * \return The substituted result. */ Type TypeSubst(const Type& type, const tvm::Map<TypeVar, Type>& subst_map); /*! * \brief Substitute type vars in type. * \param expr The expr to be substituted. * \param subst_map The map of substitution. * \return The substituted result. */ Expr TypeSubst(const Expr& expr, const tvm::Map<TypeVar, Type>& subst_map); /*! * \brief Make arbitrary transformation preserve the out most function. * \param func The transformation. * \param e The expression * \return the transformed expression. If e is a function the return is also a function. */ inline Expr TransformF(const std::function<Expr(const Expr&)>& func, const Expr& e) { if (const FunctionNode* f = e.as<FunctionNode>()) { return FunctionNode::make(f->params, func(f->body), f->ret_type, f->type_params, f->attrs); } else { return func(e); } } /*! * \brief Decide whether the expression atomic or not? * \param e the expression * \return * is it atomic? * if so, the compute cost of the expression is bounded so it can be copy without graph mode. */ inline bool IsAtomic(const Expr& e) { return e.as<VarNode>() || e.as<OpNode>() || e.as<ConstructorNode>() || e.as<GlobalVarNode>(); } template<typename ConditionNodePtr> struct TreeNode { typedef std::shared_ptr<TreeNode<ConditionNodePtr>> pointer; virtual ~TreeNode() {} }; template<typename ConditionNodePtr> struct TreeLeafNode : TreeNode<ConditionNodePtr> { using TreeNodePtr = typename TreeNode<ConditionNodePtr>::pointer; Expr body; explicit TreeLeafNode(Expr body): body(body) {} static TreeNodePtr Make(Expr body) { return std::make_shared<TreeLeafNode>(body); } ~TreeLeafNode() {} }; template<typename ConditionNodePtr> struct TreeLeafFatalNode : TreeNode<ConditionNodePtr> { using TreeNodePtr = typename TreeNode<ConditionNodePtr>::pointer; TreeLeafFatalNode() = default; static TreeNodePtr Make() { return std::make_shared<TreeLeafFatalNode>(); } ~TreeLeafFatalNode() {} }; template<typename ConditionNodePtr> struct TreeBranchNode : TreeNode<ConditionNodePtr> { using TreeNodePtr = typename TreeNode<ConditionNodePtr>::pointer; ConditionNodePtr cond; TreeNodePtr then_branch; TreeNodePtr else_branch; TreeBranchNode(ConditionNodePtr cond, TreeNodePtr then_branch, TreeNodePtr else_branch) : cond(cond), then_branch(then_branch), else_branch(else_branch) {} static TreeNodePtr Make(ConditionNodePtr cond, TreeNodePtr then_branch, TreeNodePtr else_branch) { return std::make_shared<TreeBranchNode>(cond, then_branch, else_branch); } ~TreeBranchNode() {} }; } // namespace relay } // namespace tvm #endif // TVM_RELAY_PASS_PASS_UTIL_H_