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CHAPTER 13 FIR Name Derived Class

 Names generally refer to an explicitly or implicitly declared entity. The variety of name forms derived from the FIR_Name class is shown in Table 144 on page 201.

As represented in the FIR, a name may always be replaced by its referent. For example the name for a declaration may be replaced by the declaration itself. Translating from a names to its referent(s) is called lookup. Since the actual organization of declarator information is implementation-dependent, FIR provides no lookup data strucutes.
TABLE 144. Class hierarchy derived from FIR_Name class

Level 3 Derived Classes
(only classes derived from FIR_Name)

Level 4 Derived Classes

Level 5 Derived Classes

E

 FIR_SelectedName

E

 FIR_SelectedNameByAll

E

 FIR_IndexedName

E

 FIR_SliceName

E

 FIR_Attribute

 E

 FIR_UserAttribute

E

 FIR_BaseAttriBute

E

 FIR_LeftAttribute

E

 FIR_RightAttribute

E

 FIR_LowAttribute

E

 FIR_HighAttribute

E

 FIR_AscendingAttribute

E

 FIR_ImageAttribute

E

 FIR_ValueAttribute

E

 FIR_PosAttribute

E

 FIR_ValAttribute

E

 FIR_SuccAttribute

E

 FIR_PredAttribute

E

 FIR_LeftOfAttribute

E

 FIR_RightOfAttribute

E

 FIR_RangeAttribute

E

 FIR_ReverseRangeAttribute

E

 FIR_LengthAttribute

E

 FIR_AscendingAttribute

E

 FIR_DelayedAttribute

E

 FIR_StableAttribute

E

 FIR_QuietAttribute

E

 FIR_TransactionAttribute

E

 FIR_AscendingAttribute

E

 FIR_EventAttribute

E

 FIR_ActiveAttribute

E

 FIR_LastEventAttribute

E

 FIR_LastActiveAttribute

E

 FIR_LastValueAttribute

E

 FIR_DrivingAttribute

E

 FIR_DrivingValueAttribute

E

 FIR_SimpleNameAttribute

E

 FIR_InstanceNameAttribute

E

 FIR_PathNameAttribute

E

 FIR_AcrossAttribute

E

 FIR_ThroughAttribute

E

 FIR_ReferenceAttribute

E

 FIR_ContributionAttribute

E

 FIR_DotAttribute

E

 FIR_IntegAttribute

E

 FIR_AboveAttribute

13.1 FIR_Name

13.1.1 Derived Class Description

 The pre-defined FIR_Name class represents the general class of references to explicitly or implicitly declared named entities.

13.1.2 Properties
TABLE 145. FIR_Name Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 None, not directly instantiated

Parent class

 FIR

Predefined child classes

 FIR_SelectedName
FIR_SelectedNameByAll
FIR_IndexedName
FIR_SliceName
FIR_Attribute

Application-specific data elements

 None, not allowed for this class

13.1.3 Predefined Data Elements 

struct FIR_Name {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix; /* name or identifier */
};

13.2 FIR_SelectedName

13.2.1 Derived Class Description

 The predefined FIR_SelectedName class represents naming in which a prefix denotes a collection of entities and the suffix further specifies a subset of the collection.

13.2.2 Properties
TABLE 146. FIR_SelectedName Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_SELECTED_NAME

Parent class

 FIR_Name

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.2.3 Predefined Data Elements 

struct FIR_SelectedName {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix; /* name or identifier */
	FIR_Ref		suffix; /* name or identifier */
};

13.3 FIR_SelectedNameByAll

13.3.1 Derived Class Description

 The predefined FIR_SelectedNameByAll class represents all of the individual items present in the collection denoted by the prefix.

13.3.2 Properties
TABLE 147. FIR_SelectedNameByAll Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_SELECTED_NAME_BY_ALL

Parent class

 FIR_Name

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.3.3 Predefined Data Elements 

struct FIR_SelectedNameByAll {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix; /* name or identifier */
};

13.4 FIR_IndexedName

13.4.1 Derived Class Description

 The predefined FIR_IndexedName denotes a single element of an array.

13.4.2 Properties
TABLE 148. FIR_IndexedName Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_INDEXED_NAME

Parent class

 FIR_Name

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.4.3 Predefined Data Elements 

struct FIR_IndexedName {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix; /* name or identifier */;
	FIR_Ref		suffix; /* index_expression;
};

13.5 FIR_SliceName

13.5.1 Derived Class Description

 The predefined FIR_SliceName refers to zero or more elements of an array via a range.

13.5.2 Properties
TABLE 149. FIR_SliceName Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_SLICE_NAME

Parent class

 FIR_Name

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.5.3 Predefined Data Elements 

struct FIR_SliceName {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix; /* name or identifier */
	FIR_Ref		suffix; /* range_expression */
};

13.6 FIR_Attribute

13.6.1 Derived Class Description

 The predefined FIR_Attribute class refers to a value, function or implicitly named entity.

13.6.2 Properties
TABLE 150. FIR_Attribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 None, not directly instantiated

Parent class

 FIR_Name

Predefined child classes

 FIR_UserAttribute
FIR_BaseAttribute
FIR_LeftAttribute
FIR_RightAttribute
FIR_LowAttribute
FIR_HighAttribute
FIR_AscendingAttribute
FIR_ImageAttribute
FIR_ValueAttribute
FIR_PosAttribute
FIR_ValAttribute
FIR_SuccAttribute
FIR_PredAttribute
FIR_LeftOfAttribute
FIR_RightOfAttribute
FIR_RangeAttribute
FIR_ReverseRangeAttribute
FIR_LengthAttribute
FIR_DelayedAttribute
FIR_StableAttribute
FIR_QuietAttribute
FIR_TransactionAttribute
FIR_EventAttribute
FIR_ActiveAttribute
FIR_LastEventAttribute
FIR_LastActiveAttribute
FIR_LastValueAttribute
FIR_DrivingAttribute
FIR_DrivingValueAttribute
FIR_SimpleNameAttribute
FIR_InstanceNameAttribute
FIR_PathNameAttribute
FIR_AcrossAttribute
FIR_ThroughAttribute
FIR_ReferenceAttribute
FIR_ContributionAttribute
FIR_DotAttribute
FIR_IntegAttribute
FIR_AboveAttribute

Application-specific data elements

 None, not allowed for this class

13.6.3 Predefined Data Elements 

struct FIR_Attribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* name, identifier or declarator */
};

13.7 FIR_UserAttribute

13.7.1 Derived Class Description

 The predefined FIR_UserAttribute refers to a named value associated with an entity.

13.7.2 Properties
TABLE 151. FIR_UserAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_USER_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.7.3 Predefined Data Elements 

struct FIR_UserAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;
	FIR_Ref		suffix; /* value */
};

13.8 FIR_BaseAttribute

13.8.1 Derived Class Description

 The predefined FIR_BaseAttribute refers to the base type of the attribute's prefix.

13.8.2 Properties
TABLE 152. FIR_BaseAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_BASE_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.8.3 Predefined Data Elements 

struct FIR_BaseAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix; /* type */
};

13.9 FIR_LeftAttribute

13.9.1 Derived Class Description

 The predefined FIR_LeftAttribute class represents the left bound of a scalar object or the left bound of the Nth dimension of an array object.

13.9.2 Properties
TABLE 153. FIR_LeftAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_LEFT_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.9.3 Predefined Data Elements

 The dimension is only valid if prefix is an array. 

struct FIR_LeftAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* type or array */
	FIR_Ref		suffix;  /* dimension for array prefix */
};

13.10 FIR_RightAttribute

13.10.1 Derived Class Description

 The predefined FIR_RightAttribute class represents the right bound of a scalar object or the right bound of the Nth dimension of an array object.

13.10.2 Properties
TABLE 154. FIR_RightAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_RIGHT_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.10.3 Predefined Data Elements 

struct FIR_RightAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* type or array */
	FIR_Ref		suffix;  /* dimension for array prefix */
};

13.11 FIR_LowAttribute

13.11.1 Derived Class Description

 The FIR_LowAttribute predefined class represents the lower bound of an entity of scalar type (prefix).

13.11.2 Properties
TABLE 155. FIR_LowAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_LOW_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.11.3 Predefined Data Elements 

struct FIR_LowAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* type or array */
	FIR_Ref		suffix;  /* dimension for array prefix */
};

13.12 FIR_HighAttribute

13.12.1 Derived Class Description

 The FIR_HighAttribute predefined class represents the higher bound of an entity of scalar type (prefix).

13.12.2 Properties
TABLE 156. FIR_HighAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_HIGH_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.12.3 Predefined Data Elements 

struct FIR_HighAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* type or array */
	FIR_Ref		suffix;  /* dimension for array prefix */
};

13.13 FIR_AscendingAttribute

13.13.1 Derived Class Description

 The predefined FIR_AscendingAttribute is true if the prefix is a scalar type or subtype having ascending range or the Nth dimension of an array object having the specified suffix.

13.13.2 Properties
TABLE 157. FIR_AscendingAttribute Properties
Applicable language(s)

 VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_ASCENDING_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.13.3 Predefined Data Elements 

struct FIR_AscendingAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* type or array */
	FIR_Ref		suffix;  /* dimension for array prefix */
};

13.14 FIR_ImageAttribute

13.14.1 Derived Class Description

 The predefined FIR_ImageAttribute class represents the printable form of its suffix having type specified by the prefix.

13.14.2 Properties
TABLE 158. FIR_ImageAttribute Properties
Applicable language(s)

 VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_IMAGE_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.14.3 Predefined Data Elements 

struct FIR_ImageAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix; /* type */
	FIR_Ref		suffix; /* value */
};

13.15 FIR_ValueAttribute

13.15.1 Derived Class Description

 The predefined FIR_ValueAttribute represents the value of the suffix interpreted via the type denoted by the prefix.

13.15.2 Properties
TABLE 159. FIR_ValueAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_VALUE_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.15.3 Predefined Data Elements 

struct FIR_ValueAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* type */
	FIR_Ref		suffix;  /* string_representation */
};

13.16 FIR_PosAttribute

13.16.1 Derived Class Description

 The predefined FIR_PosAttribute represents the position number of the suffix interpreted in terms of a type (or subtype) denoted by the prefix.

13.16.2 Properties
TABLE 160. FIR_PosAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_POS_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.16.3 Predefined Data Elements 

struct FIR_PosAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* type */
	FIR_Ref		suffix;  /* expression */
};

13.17 FIR_ValAttribute

13.17.1 Derived Class Description

 The predefined FIR_ValAttribute represents the value, in terms of the type or subtype denoted by the prefix, of the suffix.

13.17.2 Properties
TABLE 161. FIR_ValAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_VAL_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.17.3 Predefined Data Elements 

struct FIR_ValAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* type */
	FIR_Ref		suffix;  /* integer expression */ 
};

13.18 FIR_SuccAttribute

13.18.1 Derived Class Description

 The predefined FIR_SuccAttribute class represents the value which is one greater than the suffix when interpreted using the type or subtype denoted by the prefix.

13.18.2 Properties
TABLE 162. FIR_SuccAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_SUCC_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.18.3 Predefined Data Elements 

struct FIR_SuccAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* type */
	FIR_Ref		suffix;  /* expression */
};

13.19 FIR_PredAttribute

13.19.1 Derived Class Description

 The predefined FIR_PredAttribute class represents the value which is one less than the suffix when interpreted using the type or subtype denoted by the prefix.

13.19.2 Properties
TABLE 163. FIR_PredAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_PRED_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.19.3 Predefined Data Elements 

struct FIR_PredAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* type */
	FIR_Ref		suffix;  /* expression */
};

13.20 FIR_LeftOfAttribute

13.20.1 Derived Class Description

 The predefined FIR_LeftOfAttribute class represents the value which is to the left of the suffix when interpreted using the type or subtype denoted by the prefix.

13.20.2 Properties
TABLE 164. FIR_LeftOfAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_LEFT_OF_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.20.3 Predefined Data Elements 

struct FIR_LeftOfAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* type */
	FIR_Ref		suffix;  /* expression */
};

13.21 FIR_RightOfAttribute

13.21.1 Derived Class Description

 The predefined FIR_RightOfAttribute class represents the value which is to the right of the suffix when interpreted using the type or subtype denoted by the prefix.

13.21.2 Properties
TABLE 165. FIR_RightOfAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_RIGHT_OF_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.21.3 Predefined Data Elements 

struct FIR_RightOfAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* type */
	FIR_Ref		suffix;  /* expression */

};

13.22 FIR_RangeAttribute

13.22.1 Derived Class Description

 The predefined FIR_RangeAttribute represents the range of the Nth dimension (suffix) of the prefix (an array type, subtype or object).

13.22.2 Properties
TABLE 166. Arraying Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_RANGE_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.22.3 Predefined Data Elements 

struct FIR_RangeAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix; /* array */
	FIR_Ref		suffix;  /* dimension for array prefix */
};

13.23 FIR_ReverseRangeAttribute

13.23.1 Derived Class Description

 The predefined FIR_ReverseRangeAttribute represents the reverse range of the Nth dimension (suffix) of the prefix (an array type, subtype or object).

13.23.2 Properties
TABLE 167. FIR_ReverseRangeAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_REVERSE_RANGE_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.23.3 Predefined Data Elements 

struct FIR_ReverseRangeAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* array */
	FIR_Ref		suffix;  /* dimension for array prefix */
};

13.24 FIR_LengthAttribute

13.24.1 Derived Class Description

 The predefined FIR_LengthAttribute represents the number of elements present in the Nth dimension (suffix) of an array object, type or subtype denoted by the prefix.

13.24.2 Properties
TABLE 168. FIR_LengthAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_LENGTH_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.24.3 Predefined Data Elements 

struct FIR_LengthAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* array */
	FIR_Ref		suffix;  /* dimension for array prefix */
};

13.25 FIR_DelayedAttribute

13.25.1 Derived Class Description

 The predefined FIR_DelayedAttribute class represents the delayed form of a signal (prefix) where the suffix denotes the delay value

13.25.2 Properties
TABLE 169. FIR_DelayedAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_DELAYED_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.25.3 Predefined Data Elements 

struct FIR_DelayedAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix; /* signal */
	FIR_Ref		suffix;  /* static time expression */
};

13.26 FIR_StableAttribute

13.26.1 Derived Class Description

 The predefined FIR_StableAttribute class represents a boolean asserting that an event has not occurred on a signal (denoted by the prefix) for an interval of time denoted by the optional suffix.

13.26.2 Properties
TABLE 170. FIR_StableAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_STABLE_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.26.3 Predefined Data Elements 

struct FIR_StableAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* signal */
	FIR_Ref		suffix;  /* static time expression */
};

13.27 FIR_QuietAttribute

13.27.1 Derived Class Description

 The predefined FIR_QuietAttribute represents a boolean denoting that a signal (the prefix) has been quiet for at least the time interval denoted by the suffix.

13.27.2 Properties
TABLE 171. FIR_QuietAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_QUIET_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.27.3 Predefined Data Elements 

struct FIR_QuietAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* signal */
	FIR_Ref		suffix;  /* static time expression */
};

13.28 FIR_TransactionAttribute

13.28.1 Derived Class Description

 The predefined FIR_TransactionAttribute represents a boolean which toggles value on each simulation cycle where a signal (denoted by the prefix) becomes active.

13.28.2 Properties
TABLE 172. FIR_TransactionAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_TRANSACTION_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.28.3 Predefined Data Elements 

struct FIR_TransactionAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* signal */
};

13.29 FIR_EventAttribute

13.29.1 Derived Class Description

 The predefined FIR_EventAttribute class is a boolean attribute representing when an event has occurred during the current simulation cycle on a signal denoted by the attribute's prefix.

13.29.2 Properties
TABLE 173. FIR_EventAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_EVENT_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.29.3 Predefined Data Elements 

struct FIR_EventAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* signal */
};

13.30 FIR_ActiveAttribute

13.30.1 Derived Class Description

 The predefined FIR_ActiveAttribute class represents a boolean attribute denoting if a signal (denoted by the prefix) is active on the current simulation cycle.

13.30.2 Properties
TABLE 174. FIR_ActiveAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_ACTIVE_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.30.3 Predefined Data Elements 

struct FIR_ActiveAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* signal */
};

13.31 FIR_LastEventAttribute

13.31.1 Derived Class Description

 The predefined FIR_LastEventAttribute class represents the interval of time since the last event occurred on a signal denoted by the prefix.

13.31.2 Properties
TABLE 175. FIR_LastEventAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_LAST_EVENT_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.31.3 Predefined Data Elements 

struct FIR_LastEventAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix; /* signal */
};

13.32 FIR_LastActiveAttribute

13.32.1 Derived Class Description

 The predefined FIR_LastActiveAttribute class represents the amount of time since a signal denoted by the prefix was last active.

13.32.2 Properties
TABLE 176. FIR_LastActiveAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_LAST_ACTIVE_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.32.3 Predefined Data Elements 

struct FIR_LastActiveAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* signal */
};

13.33 FIR_LastValueAttribute

13.33.1 Derived Class Description

 The predefined FIR_LastValueAttribute class represents the last value assumed by a signal denoted by the attribute's prefix.

13.33.2 Properties
TABLE 177. FIR_LastValueAttribute Properties
Applicable language(s)

 VHDL-87, VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_LAST_VALUE_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.33.3 Predefined Data Elements 

struct FIR_LastValueAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* signal */
};

13.34 FIR_DrivingAttribute

13.34.1 Derived Class Description

 The predefined FIR_DrivingAttribute class assists in determining which driver is driving a signal denoted by the attribute prefix.

13.34.2 Properties
TABLE 178. FIR_DrivingAttribute Properties
Applicable language(s)

 VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_DRIVING_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.34.3 Predefined Data Elements 

struct FIR_DrivingAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* signal */
};

13.35 FIR_DrivingValueAttribute

13.35.1 Derived Class Description

 The predefined FIR_DrivingAttribute class assists in determining which driver is driving a signal denoted by the attribute prefix.

13.35.2 Properties
TABLE 179. FIR_DrivingAttribute Properties
Applicable language(s)

 VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_DRIVING_VALUE_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.35.3 Predefined Data Elements 

struct FIR_DrivingValueAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* signal */
};

13.36 FIR_SimpleNameAttribute

13.36.1 Derived Class Description

 The predefined FIR_SimpleNameAttribute class represents the simple name associated with a named entity.

13.36.2 Properties
TABLE 180. FIR_SimpleNameAttribute Properties
Applicable language(s)

 VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_SIMPLE_NAME_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.36.3 Predefined Data Elements 

struct FIR_SimpleNameAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* named entity */
};

13.37 FIR_InstanceNameAttribute

13.37.1 Derived Class Description

 The predefined FIR_InstanceNameAttribute class represents the hierarchical path name associated with a named entity (including its simple name).

13.37.2 Properties
TABLE 181. FIR_InstanceNameAttribute Properties
Applicable language(s)

 VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_INSTANCE_NAME_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.37.3 Predefined Data Elements 

struct FIR_InstanceNameAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* named entity */
};

13.38 FIR_PathNameAttribute

13.38.1 Derived Class Description

 The predefined FIR_PathNameAttribute class represents the hierarchical path name associated with a named entity (including its simple name).

13.38.2 Properties
TABLE 182. FIR_PathNameAttribute Properties
Applicable language(s)

 VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_PATH_NAME_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.38.3 Predefined Data Elements 

struct FIR_PathNameAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;  /* named entity */
};

13.39 FIR_AcrossAttribute

13.39.1 Derived Class Description

 The predefined FIR_AcrossAttribute class represents the across type of the nature prefix.

13.39.2 Properties
TABLE 183. FIR_AcrossAttribute Properties
Applicable language(s)

 VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_ACROSS_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.39.3 Predefined Data Elements 

struct FIR_AcrossAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;
};

13.40 FIR_ThroughAttribute

13.40.1 Derived Class Description

 The predefined FIR_ThroughAttribute class represents the through type of the nature prefix.

13.40.2 Properties
TABLE 184. FIR_ThroughAttribute Properties
Applicable language(s)

 VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_THROUGH_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.40.3 Predefined Data Elements 

struct FIR_ThroughAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;
};

13.41 FIR_ReferenceAttribute

13.41.1 Derived Class Description

 The predefined FIR_ReferenceAttribute class represents the reference terminal for the nature denoted by the prefix.

13.41.2 Properties
TABLE 185. FIR_ReferenceAttribute Properties
Applicable language(s)

 VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_REFERENCE_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.41.3 Predefined Data Elements 

struct FIR_ReferenceAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;
};

13.42 FIR_ContributionAttribute

13.42.1 Derived Class Description

 The predefined FIR_ContributionAttribute class represents the through quantity formed by the prefix (plus terminal) and a minus terminal which is the reference of the nature of the prefix.

13.42.2 Properties
TABLE 186. FIR_ContributionAttribute Properties
Applicable language(s)

 VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_CONTRIBUTION_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.42.3 Predefined Data Elements 

struct FIR_ContributionAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;
};

13.43 FIR_DotAttribute

13.43.1 Derived Class Description

 The predefined FIR_DotAttribute class represents the time differential of the prefix when the attribute is evaluated.

13.43.2 Properties
TABLE 187. FIR_DotAttribute Properties
Applicable language(s)

 VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_DOT_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.43.3 Predefined Data Elements 

struct FIR_DotAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;
};

13.44 FIR_IntegAttribute

13.44.1 Derived Class Description

 The predefined FIR_IntegAttribute class represents the time integral of the prefix from time=0 to the time at which evaluation takes place.

13.44.2 Properties
TABLE 188. FIR_IntegAttribute Properties
Applicable language(s)

 VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_INTEG_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.44.3 Predefined Data Elements 

struct FIR_IntegAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;
};

13.45 FIR_AboveAttribute

13.45.1 Derived Class Description

 The predefined FIR_AboveAttribute class represents a boolean tolerance function which is TRUE if the prefix is sufficiently above the suffix, FALSE if it is sufficiently below and undefined in between.

13.45.2 Properties
TABLE 189. FIR_AboveAttribute Properties
Applicable language(s)

 VHDL-93, VHDL-98*

IR_Kind enumeration value

 IR_ABOVE_ATTRIBUTE

Parent class

 FIR_Attribute

Predefined child classes

 None

Application-specific data elements

 Via extension class

13.45.3 Predefined Data Elements 

struct FIR_AboveAttribute {
	IR_Kind		kind;
	FIR_Source		source_locator;
	FIR_Ref		prefix;
	FIR_Ref		suffix;
};

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