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/*
* Copyright (c) 2019 Samsung Electronics Co., Ltd. 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.
*/
#ifndef __LOCO_SERVICE_TYPE_INFERENCE_H__
#define __LOCO_SERVICE_TYPE_INFERENCE_H__
#include "loco/IR/DataType.h"
#include "loco/IR/Node.h"
#include "loco/IR/Dialect.h"
#include "loco/IR/Graph.h"
#include <map>
/**
* @file This file implements dialect-agnostic type inference framework.
*
* HOW TO USE:
*
* loco::Graph *g = ...;
* loco::TypeInferenceRule *rule = ...;
* loco::apply(rule).to(g);
*
*/
namespace loco
{
struct TypeInferenceRule
{
virtual ~TypeInferenceRule() = default;
/// @brief Return true if this rule recognizes a given dialect
virtual bool recognize(const Dialect *) const = 0;
/**
* Framework guarantees the followings:
*
* 1. Framework tries to infer the data type of each node only after the data type of all of
* its valid (= non-nullptr) argument nodes is inferred.
* 2. The result of preceding "infer" is accessible through below dtype_get method.
* - This holds only when preceding "infer" returns true.
*/
virtual bool infer(const Node *, DataType &) const = 0;
};
/**
* @brief Type Inference Rule for Canonical Dialect
*/
struct CanonicalTypeInferenceRule final : public TypeInferenceRule
{
bool recognize(const Dialect *) const final;
bool infer(const Node *, DataType &) const final;
};
/**
* @brief Type Inference Rule for multiple dialects
*/
class MultiDialectTypeInferenceRule final : public TypeInferenceRule
{
public:
bool recognize(const Dialect *) const final;
bool infer(const Node *, DataType &) const final;
/// @brief Bind a specific rule to a Dialect
MultiDialectTypeInferenceRule &bind(const Dialect *d, const TypeInferenceRule *rule);
private:
std::map<const Dialect *, const TypeInferenceRule *> _rules;
};
class TypeInferenceSession
{
public:
TypeInferenceSession(const TypeInferenceRule *rule) : _rule{rule}
{
// DO NOTHING
}
public:
bool to(Graph *g) const;
private:
const TypeInferenceRule *_rule;
};
inline TypeInferenceSession apply(TypeInferenceRule *r) { return TypeInferenceSession{r}; }
struct TypeInference
{
static bool known(const Node *);
static DataType get(const Node *);
static void erase(Node *);
};
inline bool dtype_known(const Node *node) { return TypeInference::known(node); }
inline DataType dtype_get(const Node *node) { return TypeInference::get(node); }
inline void dtype_erase(Node *node) { TypeInference::erase(node); }
} // namespace loco
#endif // __LOCO_SERVICE_TYPE_INFERENCE_H__
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