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CHAPTER 9 FIR_Tuple Derived Classes

 Classes derived from FIR_Tuple represent specific collections of information related to a particular aspect of the design being represented. For a specific class derived from FIR_Tuple, the set of information is finite and well defined. Table 26 on page 75 illustrates the design hierarchy derived from FIR_Tuple.
TABLE 26. Class derivation hierarchy from FIR_Tuple

Level 3 Derived Classes
(only classes derived from FIR_Tuple)

 E

 Level 4 Derived Classes

 E

 Level 5 Derived Classes

E

 FIR_AssociationElement

 E

 FIR_AssociationElementExpression

E

 FIR_AssociationElementOpen

E

 FIR_BreakElement

E

 FIR_CaseStatementAlternative

 E

 FIR_CaseStatementAlternativeByExpression

E

 FIR_CaseStatementAlternativeByChoices

E

 FIR_CaseStatementAlternativeByOthers

E

 FIR_Choice

 E

E

 FIR_ConditionalWaveform

 E

E

 FIR_ConfigurationItem

 E

 FIR_BlockConfiguration

E

 FIR_ComponentConfiguration

FIR_Designator

FIR_DesignatorExplicit

E

 FIR_DesignatorByOthers

E

 FIR_DesignatorByAll

E

 FIR_Elsif

 E

E

 FIR_EntityClassEntry

E

 FIR_GroupConstituent

E

 FIR_SelectedWaveform

E

 FIR_SimultaneousAlternative

 E

 FIR_SimultaneousAlternativeByExpression

E

 FIR_SimultaneousAlternativeByChoices

E

 FIR_SimultaneousAlternativeByOthers

E

 FIR_SimultaneousElsif

 E

E

 FIR_WaveformElement

9.1 FIR_Tuple

The FIR_Tuple class represents miscellaneous objects having a predefined set of constituent data elements.

9.1.1 Properties
TABLE 27. FIR_Tuple 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_AssociationElement
FIR_BreakElement
FIR_CaseStatementAlternative
FIR_Choice
FIR_ConditionalWaveform
FIR_ConfigurationItem
FIR_ConfigurationSpecification
FIR_Designator
FIR_Elsif
FIR_EntityClassEntry
FIR_GroupConstituent
FIR_SelectedWaveform
FIR_WaveformElement

Instantiation?

 Indirectly via any of the derived classes of FIR_Tuple

Application-specific data elements

 None

Public data elements

 None

9.1.2 Predefined Data Elements

There are no additional data elements over the base FIR.

struct FIR_Tuple {
	IR_Kind		kind;
	FIR_Source 		source_locator;
};

9.2 FIR_AssociationElement

9.2.1 Derived Class Description

 The predefined FIR_AssociationElement classes pair a formal and (optional) actual. During elaboration, a list of such association elements serves to associate an actual value with a formal. Association elements are derived into two sub-classes: associations where the actual is an expression (FIR_AssociationElementByExpression) and associations where the actual is open (FIR_AssociationElementByOpen). Association elements are organized as individually allocated elements of a FIR_A list.

9.2.2 Properties
TABLE 28. FIR_AssociationElement Properties
Applicable language(s)

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

IR_Kind enumeration value

 None, not directly instantiated

Parent class

 FIR_Tuple

Predefined child classes

 FIR_AssociationElementByExpression

FIR_AssociationElementOpen

9.2.3 Predefined Data Elements 

struct FIR_AssociationElement {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next; /* in FIR_AssociationList */
	FIR_Ref		formal;
};

9.3 FIR_AssociationElementByExpression

9.3.1 Derived Class Description

 The predefined class FIR_AssociationElementByExpression represents either an association between a formal and an explicit actual expression or an association between elements of a composite type and their values within an aggregate.

9.3.2 Properties
TABLE 29. FIR_AssociationElementByExpression Properties
Applicable language(s)

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

IR_Kind enumeration value

 IR_ASSOCIATION_ELEMENT_BY_EXPRESSION

Parent class

 FIR_AssociationElement

Predefined child classes

 None

Application-specific data elements

 Via extension class

9.3.3 Predefined Data Elements 

struct FIR_AssocicationElementByExpression {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next; /* in FIR_AssociationElementList */
	FIR_Ref		formal;
	FIR_Ref		actual;
};

9.4 FIR_AssociationElementOpen

9.4.1 Derived Class Description

 The predefined class FIR_AssociationElementOpen represents either an association between a formal and an implicit actual expression or between the elements of a composite type and the value associated with the specified elements within an aggregate. The implicit actual value is derived from (1) a delayed binding, (2) an initializer associated with the formal interface declaration or (3) the (sub)type of the declaration itself.

9.4.2 Properties
TABLE 30. FIR_AssociationElementOpen Properties
Applicable language(s)

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

IR_Kind enumeration value

 IR_ASSOCIATION_ELEMENT_OPEN

Parent class

 FIR_AssociationElement

Predefined child classes

 None

Application-specific data elements

 Via extension class

9.4.3 Predefined Data Elements 

struct FIR_AssociationElementOpen {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next_in_list;		/* FIR_AssociationElement */
	FIR_Ref		formal;
};

9.5 FIR_BreakElement

9.5.1 Derived Class Description

 The predefined FIR_BreakElement denotes a single choice within a FIR_BreakList.

9.5.2 Properties
TABLE 31. FIR_BreakElement Properties
Applicable language(s)

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

IR_Kind enumeration value

 None, not directly instantiated

Parent class

 FIR_Tuple

Predefined child classes

 None

Application-specific data elements

 Via extension class

9.5.3 Predefined Data Elements 

struct FIR_BreakElement {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next; /* in FIR_BreakList */
	FIR_Ref		quantity;
	FIR_Ref		expression;
};

9.6 FIR_CaseStatementAlternative

9.6.1 Derived Class Description

 The predefined FIR_CaseStatementAlternative represents a choice and implication within a case statement. The choice may either explicitly denote elements of a composite type or may refer to elements which have not already been referenced previously in a case statement alternative list. Objects of case statement alternative class are actually constructed from one of two derived classes corresponding to explicit and others choices.

9.6.2 Properties
TABLE 32. FIR_CaseStatementAlternative Properties
Applicable language(s)

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

IR_Kind enumeration value

 None, not directly instantiated

Parent class

 FIR_Tuple

Predefined child classes

 FIR_CaseStatementAlternativeByExpression
FIR_CaseStatementAlternativeByChoices
FIR_CaseStatementAlternativeByOthers

Application-specific data elements

 Via extension classes associated with specific derived classes of the FIR_CaseStatementAlternative class

9.6.3 Predefined Data Elements 

struct FIR_CaseStatementAlternative {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next; /* FIR_CaseStatementAlternativeList link */
	FIR_SequentialStatementList					sequence_of_statements;
};

9.7 FIR_CaseStatementAlternativeByExpression

9.7.1 Derived Class Description

 The predefined FIR_CaseStatementAlternativeByExpression represents a case statement alternative in which the choice is a simple expression, discrete range (range type), or element simple name (the choice).

9.7.2 Properties
TABLE 33. FIR_CaseStatementAlternativeByExpression Properties
Applicable language(s)

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

IR_Kind enumeration value

 IR_CASE_STATEMENT_ALTERNATIVE_BY_EXPRESSION

Parent class

 FIR_CaseStatementAlternative

Predefined child classes

 None

Application-specific data elements

 Via extension class

struct FIR_CaseStatementAlternativeByExpression {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next; /* in FIR_CaseStatementAlternativeList */
	FIR_SequentialStatementList					sequence_of_statements;
	FIR_Ref		choice;
};

9.8 FIR_CaseStatementAlternativeByChoices

9.8.1 Derived Class Description

 The predefined FIR_CaseStatementAlternativeByChoices represents a case statement alternative in which corresponds to a list of choices.

9.8.2 Properties
TABLE 34. FIR_CaseStatementAlternativeByChoices Properties
Applicable language(s)

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

IR_Kind enumeration value

 IR_CASE_STATEMENT_ALTERNATIVE_BY_CHOICES

Parent class

 FIR_CaseStatementAlternative

Predefined child classes

 None

Application-specific data elements

 Via extension class

struct FIR_CaseStatementAlternativeByChoices {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next; /* in FIR_CaseStatementAlternativeList */
	FIR_SequentialStatementList					sequence_of_statements;
	FIR_ChoiceList					choice;
};

9.9 FIR_CaseStatementAlternativeByOthers

 The predefined FIR_CaseStatementByOthers represents a case statement alternative in which the choice implicitly denotes other elements of the case's composite subtype not previously explicit within an FIR_CaseStatementAlternativeList.

9.9.1 Properties
TABLE 35. FIR_CaseStatementAlternativeByOthers Properties
Applicable language(s)

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

IR_Kind enumeration value

 IR_CASE_STATEMENT_ALTERNATIVE_BY_OTHERS

Parent class

 FIR_CaseStatementAlternative

Predefined child classes

 None

Application-specific data elements

 Via extension class

9.9.2 Predefined Data Elements 

struct FIR_CaseStatementAlternativeByOthers {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next; /* in FIR_CaseStatementAlternativeList */
	FIR_SequentialStatementList					sequence_of_statements;
};

9.10 FIR_Choice

 The predefined FIR_Choice represents a choice in an FIR_ChoiceList. The value may be a simple expression, discrete range or element simple name.

9.10.1 Properties
TABLE 36. FIR_Choice Properties
Applicable language(s)

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

IR_Kind enumeration value

 IR_CHOICE

Parent class

 FIR_Tuple

Predefined child classes

 None

Application-specific data elements

 Via extension class

9.10.2 Predefined Data Elements 

struct FIR_Choice {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next; /* in FIR_ChoiceList */
	FIR_Ref		choice;
};

9.11 FIR_ConditionalWaveform

9.11.1 Derived Class Description

 The predefined FIR_ConditionalWaveform class represents a single conditional waveform element within an FIR_ConditionalWaveformList.

9.11.2 Properties
TABLE 37. FIR_ConditionalWaveform Properties
Applicable language(s)

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

IR_Kind enumeration value

 IR_CONDITIONAL_WAVEFORM

Parent class

 FIR_Tuple

Predefined child classes

 None

Application-specific data elements

 Via extension class

9.11.3 Predefined Data Elements 

struct FIR_ConditionalWaveform {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next; /* FIR_ConditionalWaveformList linkage */
	FIR_Ref			condition;
	FIR_WaveformList			waveform_list;
};

9.12 FIR_ConfigurationItem

9.12.1 Derived Class Description

 The predefined FIR_ConfigurationItem class represents a block configuration or component configuration item within an FIR_ConfigurationItemList.

9.12.2 Properties
TABLE 38. FIR_ConfigurationItem Properties
Applicable language(s)

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

IR_Kind enumeration value

 None, not directly instantiated

Parent class

 FIR_Tuple

Predefined child classes

 FIR_BlockConfiguration
FIR_ComponentConfiguration

Application-specific data elements

 Via extension classes associated with specific derived classes of the FIR_ConfigurationItem class

9.12.3 Predefined Data Elements 

struct FIR_ConfigurationItem {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next; /* in FIR_ConfigurationItemList */
};

9.13 FIR_BlockConfiguration

9.13.1 Derived Class Description

 The predefined FIR_BlockConfiguration configures a specific concurrent block (indirectly) within a configuration design unit.

9.13.2 Properties
TABLE 39. FIR_BlockConfiguration Properties
Applicable language(s)

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

IR_Kind enumeration value

 IR_BLOCK_CONFIGURATION

Parent class

 FIR_ConfigurationItem

Predefined child classes

 None

Application-specific data elements

 Via extension class

9.13.3 Predefined Data Elements 

struct FIR_BlockConfiguration {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next; /* FIR_ConfigurationItemList linkage */
	FIR_Ref		block_specification; /* reference to FIR_Name record */
	FIR_DeclarationList				use_clause_list;
	FIR_ConfigurationItemList				configuration_item_list;
};

9.14 `FIR_ComponentConfiguration

9.14.1 Derived Class Description

 The predefined FIR_ComponentConfiguration configures a specific component instance (indirectly) within a configuration design unit.

9.14.2 Properties
TABLE 40. FIR_ComponentConfiguration Properties
Applicable language(s)

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

IR_Kind enumeration value

 IR_COMPONENT_CONFIGURATION

Parent class

 FIR_ConfigurationItem

Predefined child classes

 None

Application-specific data elements

 Via extension class

9.14.3 Predefined Data Elements 

struct FIR_ComponentConfiguration {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next; /* FIR_ConfigurationItemList linkage */
	FIR_Ref		component_name; /* reference to FIR_Name */
	FIR_Ref		entity_aspect; /* reference to FIR_LibraryUnit */
	FIR_Ref		block_config; /* to FIR_BlockConfiguration */
	FIR_InstantiationList 				instantiation list;
	FIR_AssociationList				generic_map_aspect;
	FIR_AssociationList				port_map_aspect;
};

9.15 FIR_Designator

9.15.1 Derived Class Description

 A predefined FIR_Designator class names a specific entity with a FIR_DesignatorList.

9.15.2 Properties
TABLE 41. FIR_Designator Properties
Applicable language(s)

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

IR_Kind enumeration value

 None, not directly instantiated

Parent class

 FIR_Tuple

Predefined child classes

 FIR_DesignatorExplicit
FIR_DesignatorByOthers
FIR_DesignatorByAll

Application-specific data elements

 Via extension class

9.15.3 Predefined Data Elements 

struct FIR_Designator {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next; /* FIR_DesignatorList linkage */
};

9.16 FIR_DesignatorExplicit

9.16.1 Derived Class Description

 A predefined FIR_DesignatorExplicit class names an instance within a FIR_DesignatorList.

9.16.2 Properties
TABLE 42. FIR_DesignatorExplicit Properties
Applicable language(s)

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

IR_Kind enumeration value

 IR_DESIGNATOR_EXPLICIT

Parent class

 FIR_Designator

Predefined child classes

 None

Application-specific data elements

 Via extension class

9.16.3 Predefined Data Elements 

struct FIR_DesignatorExplicit {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next; /* FIR_DesignatorList linkage */
	FIR_Ref		name; /* reference to FIR_Name */
};

9.17 FIR_DesignatorByOthers

9.17.1 Derived Class Description

 A predefined FIR_DesignatorByOthers class names all other instances within a FIR_DesignatorList.

9.17.2 Properties
TABLE 43. FIR_DesignatorByOthers Properties
Applicable language(s)

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

IR_Kind enumeration value

 IR_DESIGNATOR_BY_OTHERS

Parent class

 FIR_Designator

Predefined child classes

 None

Application-specific data elements

 Via extension class

9.17.3 Predefined Data Elements 

struct FIR_DesignatorByOthers {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next; /* FIR_DesignatorList linkage */
};

9.18 FIR_DesignatorByAll

9.18.1 Derived Class Description

 A predefined FIR_DesignatorByAll class names all instance within a FIR_DesignatorList.

9.18.2 Properties
TABLE 44. FIR_DesignatorByAll Properties
Applicable language(s)

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

IR_Kind enumeration value

 IR_DESIGNATOR_BY_ALL

Parent class

 FIR_Designator

Predefined child classes

 None

Application-specific data elements

 Via extension class

9.18.3 Predefined Data Elements 

struct FIR_DesignatorByAll {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next; /* FIR_DesignatorList linkage */
};

9.19 FIR_Elsif

9.19.1 Derived Class Description

 Within a FIR_IfStatement a FIR_Elsif record identifies a condition and a sequence of statements.

9.19.2 Properties
TABLE 45. FIR_EntityAspect Properties
Applicable language(s)

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

IR_Kind enumeration value

 IR_ELSIF

Parent class

 FIR_Tuple

Predefined child classes

 None

Application-specific data elements

 None

9.19.3 Predefined Data Elements 

struct FIR_Elsif {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		condition; /* reference to FIR_Expression */
	FIR_Ref		elsif; /* reference to next elsif or NULL */
	FIR_SequentialStatmentList				then_sequence_of_statements;
};

9.20 FIR_EntityClassEntry

9.20.1 Derived Class Description

 A predefined FIR_EntityClassEntry represents a specific kind of entity within an FIR_EntityClassEntryList. The entry identifier must be a lower case FIR_Identifier drawn from the following list:

The FIR_EntityClassEntryList in turn appears only within a group template declaration.

9.20.2 Properties
TABLE 46. FIR_EntityClassEntry Properties
Applicable language(s)

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

IR_Kind enumeration value

 IR_ENTITY_CLASS_ENTRY

Parent class

 FIR_Tuple

Predefined child classes

 None

Application-specific data elements

 Via extension class

9.20.3 Predefined Data Elements 

struct FIR_EntityClassEntry {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next; /* FIR_EntityClassEntryList linkage */
	IR_Kind		entity_kind; /* reference to FIR_Identifier */
	IR_Boolean		is_boxed;
};

9.21 FIR_SelectedWaveform

9.21.1 Derived Class Description

 The predefined FIR_SelectedWaveform class represents a selected waveform element within an FIR_SelectedWaveformList. The selected waveform list in turn appears within an FIR_ConcurrentSelectedSignalAssignment.

9.21.2 Properties
TABLE 47. FIR_SelectedWaveform Properties
Applicable language(s)

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

IR_Kind enumeration value

 IR_SELECTED_WAVEFORM

Parent class

 FIR_Tuple

Predefined child classes

 None

Application-specific data elements

 Via extension class

9.21.3 Predefined Public Methods 

struct FIR_SelectedWaveform {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next; /* FIR_SelectedWaveformList linkage */
	FIR_Ref			choice;
	FIR_WaveformList			waveform;
};

9.22 FIR_SimultaneousAlternative

9.22.1 Derived Class Description

 The predefined FIR_SimultaneousAlternative represents a choice and implication within a case statement. The choice may either explicitly denote elements of a composite type or may refer to elements which have not already been referenced previously in a case statement alternative list. Objects of case statement alternative class are actually constructed from one of two derived classes corresponding to explicit and others choices.

9.22.2 Properties
TABLE 48. FIR_SimultaneousAlternative Properties
Applicable language(s)

 VHDL-AMS

IR_Kind enumeration value

 None, not directly instantiated

Parent class

 FIR_Tuple

Predefined child classes

 FIR_SimultaneousAlternativeByExpression
FIR_SimultaneousAlternativeByChoices
FIR_SimultaneousAlternativeByOthers

Application-specific data elements

 Via extension classes associated with specific derived classes of the FIR_SimultaneousAlternative class

9.22.3 Predefined Data Elements 

struct FIR_SimultaneousAlternative {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next; /* FIR_SimultaneousAlternativeList link */
	FIR_SimultaneousStatementList					sequence_of_statements;
};

9.23 FIR_SimultaneousAlternativeByExpression

9.23.1 Derived Class Description

 The predefined FIR_SimultaneousAlternativeByExpression represents a case statement alternative in which the choice is a simple expression, discrete range (range type), or element simple name (the choice).

9.23.2 Properties
TABLE 49. FIR_SimultaneousAlternativeByExpression Properties
Applicable language(s)

 VHDL-AMS

IR_Kind enumeration value

 IR_SIMULTANEOUS_ALTERNATIVE_BY_EXPRESSION

Parent class

 FIR_SimultaneousAlternative

Predefined child classes

 None

Application-specific data elements

 Via extension class

struct FIR_SimultaneousAlternativeByExpression {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next; /* in FIR_SimultaneousAlternativeList */
	FIR_SimultaneousStatementList					sequence_of_statements;
	FIR_Ref		choice;
};

9.24 FIR_SimultaneousAlternativeByChoices

9.24.1 Derived Class Description

 The predefined FIR_SimultaneousAlternativeByChoices represents a case statement alternative in which corresponds to a list of choices.

9.24.2 Properties
TABLE 50. FIR_SimultaneousAlternativeByChoices Properties
Applicable language(s)

 VHDL-AMS

IR_Kind enumeration value

 IR_SIMULTANEOUS_ALTERNATIVE_BY_CHOICES

Parent class

 FIR_SimultaneousAlternative

Predefined child classes

 None

Application-specific data elements

 Via extension class

struct FIR_SimultaneousAlternativeByChoices {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next; /* in FIR_SimultaneousAlternativeList */
	FIR_SimultaneousStatementList					sequence_of_statements;
	FIR_ChoiceList					choice;
};

9.25 FIR_SimultaneousAlternativeByOthers

 The predefined FIR_SimultaneousAlternativeByOthers represents a case statement alternative in which the choice implicitly denotes other elements of the case's composite subtype not previously explicit within an FIR_SimultaneousAlternativeList.

9.25.1 Properties
TABLE 51. FIR_SimultaneousAlternativeByOthers Properties
Applicable language(s)

 VHDL-AMS

IR_Kind enumeration value

 IR_SIMULTANEOUS_ALTERNATIVE_BY_OTHERS

Parent class

 FIR_SimultaneousAlternative

Predefined child classes

 None

Application-specific data elements

 Via extension class

9.25.2 Predefined Data Elements 

struct FIR_SimultaneousAlternativeByOthers {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next; /* in FIR_SimultaneousAlternativeList */
	FIR_SimultaneousStatementList					sequence_of_statements;
};

9.26 FIR_SimultaneousElsif

9.26.1 Derived Class Description

 a FIR_SimultaneousElsif record identifies an elsif step in a chain within a simultaneous if-then-else statement.

9.26.2 Properties
TABLE 52. FIR_Elsif Properties
Applicable language(s)

 VHDL-AMS

IR_Kind enumeration value

 `IR_SIMULTANEOUS_ELSIF

Parent class

 FIR_Tuple

Predefined child classes

 None

Application-specific data elements

 None

9.26.3 Predefined Data Elements 

struct FIR_SimultaneousElsif {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		condition; /* reference to FIR_Expression */
	FIR_Ref		elsif; /* reference to next elsif or NULL */
	FIR_SequentialStatmentList				then_sequence_of_statements;
};

9.27 FIR_WaveformElement

9.27.1 Derived Class Description

 The predefined class FIR_WaveformElement represents a value and time tuple within an FIR_WaveformList. Such a waveform list appears directly or indirectly within sequential and concurrent signal assignment statements.

9.27.2 Properties
TABLE 53. FIR_WaveformElement Properties
Applicable language(s)

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

IR_Kind enumeration value

 IR_WAVEFORM_ELEMENT

Parent class

 FIR_Tuple

Predefined child classes

 None

Application-specific data elements

 Via extension class

9.27.3 Predefined Data Elements 

struct FIR_WaveformElement {
	IR_Kind		kind;
	FIR_Source 		source_locator;
	FIR_Ref		next; /* FIR_WaveformList linkage */
	FIR_Ref		value;
	FIR_Ref		time;
};

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