function.h

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/*
 * 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.
 */
 
#ifndef TVM_IR_FUNCTION_H_
#define TVM_IR_FUNCTION_H_
 
#include <tvm/ffi/container/array.h>
#include <tvm/ffi/container/map.h>
#include <tvm/ffi/string.h>
#include <tvm/ir/attrs.h>
#include <tvm/ir/expr.h>
 
#include <string>
#include <type_traits>
 
namespace tvm {
 
enum class CallingConv : int {
  kDefault = 0,
  kCPackedFunc = 1,
  kDeviceKernelLaunch = 2,
};
 
enum class LinkageType : int {
  kInternal = 0,
  kExternal = 1
};
 
namespace attr {
constexpr const char* kCallingConv = "calling_conv";
 
constexpr const char* kTarget = "target";
 
constexpr const char* kGlobalSymbol = "global_symbol";
 
}  // namespace attr
 
class BaseFuncNode : public RelaxExprNode {
 public:
  DictAttrs attrs;
 
  template <typename TObjectRef>
  Optional<TObjectRef> GetAttr(const std::string& attr_key,
                               Optional<TObjectRef> default_value = std::nullopt) const {
    return attrs.GetAttr(attr_key, default_value);
  }
  // variant that uses TObjectRef to enable implicit conversion to default value.
  template <typename TObjectRef>
  Optional<TObjectRef> GetAttr(const std::string& attr_key, TObjectRef default_value) const {
    return GetAttr<TObjectRef>(attr_key, Optional<TObjectRef>(default_value));
  }
 
  bool HasNonzeroAttr(const std::string& attr_key) const { return attrs.HasNonzeroAttr(attr_key); }
  LinkageType GetLinkageType() const {
    if (GetAttr<String>(attr::kGlobalSymbol))
      return LinkageType::kExternal;
    else
      return LinkageType::kInternal;
  }
 
  static void RegisterReflection() {
    namespace refl = tvm::ffi::reflection;
    refl::ObjectDef<BaseFuncNode>().def_ro("attrs", &BaseFuncNode::attrs);
  }
 
  static constexpr const char* _type_key = "ir.BaseFunc";
  static constexpr const uint32_t _type_child_slots = 2;
  TVM_DECLARE_BASE_OBJECT_INFO(BaseFuncNode, RelaxExprNode);
};
 
class BaseFunc : public RelaxExpr {
 public:
  TVM_DEFINE_OBJECT_REF_METHODS(BaseFunc, RelaxExpr, BaseFuncNode);
};
 
}  // namespace tvm
#endif  // TVM_IR_FUNCTION_H_