OVERVIEW: ============================================================ REPLACE
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1 OVERVIEW: With mantis 928, formal arguments to properties and sequences are defined to apply to a list of arguments that follow, much like tasks and function arguments. Previously, the type had to be replicated for each list item. Untyped arguments must therefore be listed first before any typed arguments. The implicit type is introduced to allow arguments that do not have any data type restrictions to be mixed freely with those that do. Use of implicit is equivalent to listing the argument prior to any typed arguments. The following describes the detailed changes that will be required in the standard. All changes are RELATIVE to the revisions of Mantis 928 and ============================================================ REPLACE A.2.10 Assertion declarations sequence_formal_type ::= data_type_or_implicit A.2.10 Assertion declarations sequence_formal_type ::= data_type_or_implicit sequence event implicit REPLACE Syntax 17-2 and Syntax 17-4 from section 17.5 and 17.6, respectively sequence_formal_type ::= data_type_or_implicit sequence_formal_type ::= data_type_or_implicit sequence event implicit
2 REPLACE Typed formal arguments in sequence declarations Formal arguments of sequences can optionally be typed. To declare a type for a formal argument of a sequence, it is required to prefix the argument with a type. A formal argument that is not prefixed by a type will be untyped. When a type is specified, that type is enforced by semantic checks. A type name can refer to a comma separated list of arguments. Untyped arguments must therefore be listed before any typed arguments. Exporting values of local variables through typed formal arguments is not supported. The supported data types for sequence formal arguments are the types that are allowed for operands in assertion expressions (see ). Sequence instances may be typed using the sequence type. The assignment rules for assigning actual argument expressions to formal arguments, at the time of sequence instantiation, are the same as the general rules for doing assignment of a typed variable with a typed expression (see Clause 4). For example, two similar ways of passing arguments are shown below. The first has untyped arguments, and the second has equivalent typed arguments. The first example does not specify any types, so the types of the actual arguments instantiated are used for semantic checks. Similarly, in the second example, w has no specified type so the type of the actual argument instantiated is used for semantic checks. Arguments x and y will be truncated to type bit, and argument z will be truncated or extended as necessary to make it of type byte. sequence rule6_with_no_type(w, x, y, z); sequence rule6_with_type_1(w, bit x, y, byte z); Typed formal arguments in sequence declarations Formal arguments of sequences can optionally be typed. To declare a type for a formal argument of a sequence, it is required to prefix the argument with a type. A formal argument that is not prefixed by a type will be untyped. When a type is specified, that type is enforced by semantic checks. A type name can refer to a comma separated list of arguments. Untyped arguments must therefore be listed before any typed arguments. Exporting values of local variables through typed formal arguments is not supported. The supported data types for sequence formal arguments are the types that are allowed for operands in assertion expressions (see ). Sequence instances may be typed using the sequence type.
3 implicit is used to specify that the argument can have any type that is legal for a sequence actual argument. There are two ways to achieve implicit typing of arguments. The first is to write the implicitly type arguments first in the list prior to specifying any type. The second is to use the implicit type. The assignment rules for assigning actual argument expressions to formal arguments, at the time of sequence instantiation, are the same as the general rules for doing assignment of a typed variable with a typed expression (see Clause 4). For example, two three similar ways of passing arguments are shown below. The first has untyped arguments, and the second and third have has equivalent typed arguments. The first example does not specify any types, so the types of the actual arguments instantiated are used for semantic checks. Similarly, in the second and third example, w has no specified type so the type of the actual argument instantiated is used for semantic checks. Arguments x and y will be truncated to type bit, and argument z will be truncated or extended as necessary to make it of type byte. sequence rule6_with_no_type(w, x, y, z); sequence rule6_with_type_1(w, bit x, y, byte z); sequence rule6_with_type_2(bit x, y, implicit w, byte z); REPLACE Typed formal arguments in property declarations Formal arguments of properties can optionally be typed. To declare a type for a formal argument of a property, it is required to prefix the argument with a type. A formal argument that is not prefixed by a type shall be untyped. A type can refer to a comma separated list of arguments. Untyped arguments must therefore be listed before any typed arguments. The supported types for property formal arguments include all the types that are allowed for sequences plus the addition of the property type. Specifically, all types that are allowed as operands in assertion expressions (see ) are allowed as formal arguments. Sequence instances may be typed using the sequence type. Property instances may be typed using the property type Typed formal arguments in property declarations
4 Formal arguments of properties can optionally be typed. To declare a type for a formal argument of a property, it is required to prefix the argument with a type. A formal argument that is not prefixed by a type shall be untyped. A type can refer to a comma separated list of arguments. Untyped arguments must therefore be listed before any typed arguments. The supported types for property formal arguments include all the types that are allowed for sequences plus the addition of the property type. Specifically, all types that are allowed as operands in assertion expressions (see ) are allowed as formal arguments. Sequence instances may be typed using the sequence type. Property instances may be typed using the property type. implicit is used to specify that the argument can have any type that is legal for a property actual argument. There are two ways to achieve implicit typing of arguments. The first is to write the implicitly type arguments first in the list prior to specifying any type. The second is to use the implicit type. REPLACE in section 23.4 The version_specifier " " specifies that only the identifiers listed as reserved keywords in the IEEE Std are considered to be reserved words. These identifiers are listed in Table The begin_keywords and end_keywords directives only specify the set of identifiers that are reserved as keywords. The directives do not affect the semantics, tokens, and other aspects of the SystemVerilog Verilog language. (note: table 23-2 is a copy of tabe 23-2 with the implicit keyword added) The version_specifier " " specifies that only the identifiers listed as reserved keywords in the IEEE Std are considered to be reserved words. These identifiers are listed in Table The version_specifier " ?" specifies that only the identifiers listed as reserved keywords in the IEEE Std ? (NOTE TO EDITOR: fill in the date of publication) are considered to be reserved words. These identifiers are listed in Table The begin_keywords and end_keywords directives only specify the set of identifiers that are reserved as keywords. The directives do not affect the semantics, tokens, and other aspects of the SystemVerilog Verilog language Table 23-2 IEEE Std reserved keywords alias always always_comb always_ff always_latch and assert assign assume automatic before begin bind bins binsof bit break buf bufif0 bufif1 byte case
5 casex casez cell chandle class clocking cmos config const constraint context continue cover covergroup coverpoint cross deassign default defparam design disable dist do edge else end endcase endclass endclocking endconfig endfunction endgenerate endgroup endinterface endmodule endpackage endprimitive endprogram endproperty endspecify endtable endtask enum event expect export extends extern final first_match for force foreach forever fork forkjoin function generate genvar highz0 highz1 if iff ifnone ignore_bins illegal_bins import implicit incdir include
6 initial inout input inside instance int integer interface intersect join join_any join_none large liblist library local localparam logic longint macromodule matches medium modport module nand negedge new nmos nor noshowcancelled not notif0 notif1 null or output package packed parameter pmos posedge primitive priority program property protected pull0 pull1 pulldown pullup pulsestyle_onevent pulsestyle_ondetect pure rand randc randcase randsequence rcmos real realtime ref reg release repeat return rnmos rpmos rtran rtranif0 rtranif1 scalared
7 sequence shortint shortreal showcancelled signed small solve specify specparam static string strong0 strong1 struct super supply0 supply1 table tagged task this throughout time timeprecision timeunit tran tranif0 tranif1 tri tri0 tri1 triand trior trireg type typedef union unique unsigned use uwire var vectored virtual void wait wait_order wand weak0 weak1 while wildcard wire with within wor xnor xor REPLACE Annex B Table B-1 Reserved keywords illegal_bins* import* incdir include illegal_bins*
8 import* implicit* incdir include
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