expr.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_EXPR_H_
#define TVM_IR_EXPR_H_

#include <tvm/ir/span.h>
#include <tvm/ir/type.h>
#include <tvm/node/node.h>
#include <tvm/runtime/container/string.h>
#include <tvm/runtime/object.h>

#include <algorithm>
#include <limits>
#include <string>
#include <type_traits>

namespace tvm {

using tvm::runtime::String;

// Forward-declare VirtualDevice to avoid circular imports.
class VirtualDevice;

class BaseExprNode : public Object {
 public:
  mutable Span span;

  static constexpr const char* _type_key = "BaseExpr";
  static constexpr const bool _type_has_method_sequal_reduce = true;
  static constexpr const bool _type_has_method_shash_reduce = true;
  static constexpr const uint32_t _type_child_slots = 62;
  TVM_DECLARE_BASE_OBJECT_INFO(BaseExprNode, Object);
};

class BaseExpr : public ObjectRef {
 public:
  TVM_DEFINE_OBJECT_REF_METHODS(BaseExpr, ObjectRef, BaseExprNode);
};

class PrimExprNode : public BaseExprNode {
 public:
  DataType dtype;

  static constexpr const char* _type_key = "PrimExpr";
  static constexpr const uint32_t _type_child_slots = 38;
  TVM_DECLARE_BASE_OBJECT_INFO(PrimExprNode, BaseExprNode);
};

class PrimExpr : public BaseExpr {
 public:
  TVM_DLL PrimExpr(int32_t value);  // NOLINT(*)
  TVM_DLL PrimExpr(float value);  // NOLINT(*)

  DataType dtype() const { return static_cast<const PrimExprNode*>(get())->dtype; }

  TVM_DEFINE_OBJECT_REF_METHODS(PrimExpr, BaseExpr, PrimExprNode);

 private:
  // Internal function for conversion.
  friend struct runtime::PackedFuncValueConverter<PrimExpr>;
  TVM_DLL static PrimExpr FromObject_(ObjectRef ref);
};

class RelayExprNode : public BaseExprNode {
 public:
  mutable Type checked_type_ = Type(nullptr);
  inline const Type& checked_type() const;
  template <typename TTypeNode>
  inline const TTypeNode* type_as() const;

  mutable ObjectRef virtual_device_;

  VirtualDevice virtual_device() const;

  static constexpr const char* _type_key = "RelayExpr";
  static constexpr const uint32_t _type_child_slots = 22;
  TVM_DECLARE_BASE_OBJECT_INFO(RelayExprNode, BaseExprNode);
};

class RelayExpr : public BaseExpr {
 public:
  TVM_DEFINE_OBJECT_REF_METHODS(RelayExpr, BaseExpr, RelayExprNode);
};

class GlobalVar;
class GlobalVarNode : public RelayExprNode {
 public:
  String name_hint;

  void VisitAttrs(AttrVisitor* v) {
    v->Visit("name_hint", &name_hint);
    v->Visit("virtual_device_", &virtual_device_);
    v->Visit("span", &span);
    v->Visit("_checked_type_", &checked_type_);
  }

  bool SEqualReduce(const GlobalVarNode* other, SEqualReducer equal) const {
    // name matters for global var.
    return equal(name_hint, other->name_hint) && equal.FreeVarEqualImpl(this, other);
  }

  void SHashReduce(SHashReducer hash_reduce) const {
    hash_reduce(name_hint);
    hash_reduce.FreeVarHashImpl(this);
  }

  static constexpr const char* _type_key = "GlobalVar";
  TVM_DECLARE_FINAL_OBJECT_INFO(GlobalVarNode, RelayExprNode);
};

class GlobalVar : public RelayExpr {
 public:
  TVM_DLL explicit GlobalVar(String name_hint, Type type = {}, Span span = {});

  TVM_DEFINE_OBJECT_REF_METHODS(GlobalVar, RelayExpr, GlobalVarNode);
  TVM_DEFINE_OBJECT_REF_COW_METHOD(GlobalVarNode);
};

// PrimExprs that are useful as runtime containers.
//
class IntImmNode : public PrimExprNode {
 public:
  int64_t value;

  void VisitAttrs(AttrVisitor* v) {
    v->Visit("dtype", &dtype);
    v->Visit("value", &value);
    v->Visit("span", &span);
  }

  bool SEqualReduce(const IntImmNode* other, SEqualReducer equal) const {
    return equal(dtype, other->dtype) && equal(value, other->value);
  }

  void SHashReduce(SHashReducer hash_reduce) const {
    hash_reduce(dtype);
    hash_reduce(value);
  }

  static constexpr const char* _type_key = "IntImm";
  TVM_DECLARE_FINAL_OBJECT_INFO(IntImmNode, PrimExprNode);
};

class IntImm : public PrimExpr {
 public:
  TVM_DLL IntImm(DataType dtype, int64_t value, Span span = Span());

  TVM_DEFINE_OBJECT_REF_METHODS(IntImm, PrimExpr, IntImmNode);
};

class FloatImmNode : public PrimExprNode {
 public:
  double value;

  void VisitAttrs(AttrVisitor* v) {
    v->Visit("dtype", &dtype);
    v->Visit("value", &value);
    v->Visit("span", &span);
  }

  bool SEqualReduce(const FloatImmNode* other, SEqualReducer equal) const {
    return equal(dtype, other->dtype) && equal(value, other->value);
  }

  void SHashReduce(SHashReducer hash_reduce) const {
    hash_reduce(dtype);
    hash_reduce(value);
  }

  static constexpr const char* _type_key = "FloatImm";
  TVM_DECLARE_FINAL_OBJECT_INFO(FloatImmNode, PrimExprNode);
};

class FloatImm : public PrimExpr {
 public:
  TVM_DLL FloatImm(DataType dtype, double value, Span span = Span());

  TVM_DEFINE_OBJECT_REF_METHODS(FloatImm, PrimExpr, FloatImmNode);
};

class Bool : public IntImm {
 public:
  explicit Bool(bool value, Span span = Span()) : IntImm(DataType::Bool(), value, span) {}
  Bool operator!() const { return Bool((*this)->value == 0); }
  operator bool() const { return (*this)->value != 0; }

  TVM_DEFINE_NOTNULLABLE_OBJECT_REF_METHODS(Bool, IntImm, IntImmNode);
};

// Overload operators to make sure we have the most fine grained types.
inline Bool operator||(const Bool& a, bool b) { return Bool(a.operator bool() || b); }
inline Bool operator||(bool a, const Bool& b) { return Bool(a || b.operator bool()); }
inline Bool operator||(const Bool& a, const Bool& b) {
  return Bool(a.operator bool() || b.operator bool());
}
inline Bool operator&&(const Bool& a, bool b) { return Bool(a.operator bool() && b); }
inline Bool operator&&(bool a, const Bool& b) { return Bool(a && b.operator bool()); }
inline Bool operator&&(const Bool& a, const Bool& b) {
  return Bool(a.operator bool() && b.operator bool());
}

inline bool operator==(const Bool& a, bool b) { return a.operator bool() == b; }
inline bool operator==(bool a, const Bool& b) { return a == b.operator bool(); }
inline bool operator==(const Bool& a, const Bool& b) {
  return a.operator bool() == b.operator bool();
}

class Integer : public IntImm {
 public:
  Integer() {}
  explicit Integer(ObjectPtr<Object> node) : IntImm(node) {}
  Integer(int value, Span span = Span()) : IntImm(DataType::Int(32), value, span) {}  // NOLINT(*)
  Integer(IntImm other) : IntImm(std::move(other)) {}  // NOLINT(*)
  template <typename Enum, typename = typename std::enable_if<std::is_enum<Enum>::value>::type>
  explicit Integer(Enum value) : Integer(static_cast<int>(value)) {
    static_assert(std::is_same<int, typename std::underlying_type<Enum>::type>::value,
                  "declare enum to be enum int to use visitor");
  }
  Integer& operator=(const IntImm& other) {
    data_ = ObjectRef::GetDataPtr<Object>(other);
    return *this;
  }
  operator int64_t() const {
    ICHECK(data_ != nullptr) << " Trying to reference a null Integer";
    return (*this)->value;
  }
  // comparators
  Bool operator==(int other) const {
    if (data_ == nullptr) return Bool(false);
    return Bool((*this)->value == other);
  }
  Bool operator!=(int other) const { return !(*this == other); }
  template <typename Enum, typename = typename std::enable_if<std::is_enum<Enum>::value>::type>
  Bool operator==(Enum other) const {
    return *this == static_cast<int>(other);
  }
  template <typename Enum, typename = typename std::enable_if<std::is_enum<Enum>::value>::type>
  Bool operator!=(Enum other) const {
    return *this != static_cast<int>(other);
  }
};

class RangeNode : public Object {
 public:
  PrimExpr min;
  PrimExpr extent;
  mutable Span span;
  RangeNode() {}
  RangeNode(PrimExpr min, PrimExpr extent, Span span = Span())
      : min(min), extent(extent), span(span) {}

  void VisitAttrs(AttrVisitor* v) {
    v->Visit("min", &min);
    v->Visit("extent", &extent);
    v->Visit("span", &span);
  }

  bool SEqualReduce(const RangeNode* other, SEqualReducer equal) const {
    return equal(min, other->min) && equal(extent, other->extent);
  }

  void SHashReduce(SHashReducer hash_reduce) const {
    hash_reduce(min);
    hash_reduce(extent);
  }

  static constexpr const char* _type_key = "Range";
  static constexpr const bool _type_has_method_sequal_reduce = true;
  static constexpr const bool _type_has_method_shash_reduce = true;
  TVM_DECLARE_FINAL_OBJECT_INFO(RangeNode, Object);
};

class Range : public ObjectRef {
 public:
  TVM_DLL Range(PrimExpr begin, PrimExpr end, Span span = Span());
  static Range FromMinExtent(PrimExpr min, PrimExpr extent, Span span = Span());
  // declare range.
  TVM_DEFINE_OBJECT_REF_METHODS(Range, ObjectRef, RangeNode);
};

// implementataions
inline const Type& RelayExprNode::checked_type() const {
  ICHECK(checked_type_.defined()) << "internal error: the type checker has "
                                  << "not populated the checked_type "
                                  << "field for " << GetRef<RelayExpr>(this);
  return this->checked_type_;
}

template <typename TTypeNode>
inline const TTypeNode* RelayExprNode::type_as() const {
  static_assert(std::is_base_of<TypeNode, TTypeNode>::value,
                "TType must be a special case of type");
  ICHECK(checked_type_.defined())
      << "Type inference for this Expr has not completed. Try to call infer_type pass.";
  const TTypeNode* node = checked_type_.as<TTypeNode>();
  ICHECK(node != nullptr) << "Expected type to be " << TTypeNode::_type_key << ", but get "
                          << checked_type_->GetTypeKey();
  return node;
}

}  // namespace tvm

namespace tvm {
namespace runtime {
// common rule for RetValue and ArgValue
template <>
struct PackedFuncValueConverter<PrimExpr> {
  static PrimExpr From(const TVMPODValue_& val) {
    if (val.type_code() == kTVMNullptr) {
      return PrimExpr(ObjectPtr<Object>(nullptr));
    }
    if (val.type_code() == kDLInt) {
      return PrimExpr(val.operator int());
    }
    if (val.type_code() == kDLFloat) {
      return PrimExpr(static_cast<float>(val.operator double()));
    }

    return PrimExpr::FromObject_(val.AsObjectRef<ObjectRef>());
  }
};

template <>
struct PackedFuncValueConverter<tvm::Integer> {
  static tvm::Integer From(const TVMPODValue_& val) {
    if (val.type_code() == kTVMNullptr) {
      return Integer(ObjectPtr<Object>(nullptr));
    }
    if (val.type_code() == kTVMArgInt) {
      return Integer(val.operator int());
    }
    return val.AsObjectRef<tvm::Integer>();
  }
};

template <>
struct PackedFuncValueConverter<tvm::Bool> {
  static tvm::Bool From(const TVMPODValue_& val) {
    if (val.type_code() == kTVMNullptr) {
      return Bool(ObjectPtr<Object>(nullptr));
    }
    if (val.type_code() == kTVMArgInt) {
      int v = val.operator int();
      ICHECK(v == 0 || v == 1) << "ValueError: boolean value can only be 0 or 1, but get " << v;
      return Bool(static_cast<bool>(v));
    }
    return val.AsObjectRef<tvm::Bool>();
  }
};

}  // namespace runtime
}  // namespace tvm
#endif  // TVM_IR_EXPR_H_