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• Lvalues
• Vl-parse-net-lvalue-2012

Vl-expr-net-lvalue-p

Recognizer an expression that is OK for a SystemVerilog-2012 net_lvalue.

Signature

(vl-expr-net-lvalue-p x) → bool

Arguments

x — Guard (vl-expr-p x).

Here's the grammar for net_lvalue:

net_lvalue ::= ps_or_hierarchical_net_identifier constant_select
             | '{' net_lvalue { ',' net_lvalue } '}'
             | [ assignment_pattern_expression_type ] assignment_pattern_net_lvalue

The first production essentially corresponds to our notion of an index expression and the second to concatenation. The third production is quite similar to assignment_pattern_expression, which can be a valid expression primary,

assignment_pattern_expression ::= [ assignment_pattern_expression_type ] assignment_pattern

Except that here we have an assignment_pattern_net_lvalue instead of an assignment_pattern. So let's compare:

assignment_pattern_net_lvalue ::= QUOTE '{' net_lvalue { ',' net_lvalue } '}'

assignment_pattern ::= QUOTE '{' expression { ',' expression } '}'
                     | QUOTE '{' structure_pattern_key ...
                     | QUOTE '{' array_pattern_key ...
                     | QUOTE '{' constant_expression '{' ...

So essentially the grammar is just trying to (1) rule out the fancier structure/array/replication assignment patterns while still allowing basic positional assignment patterns, and (2) ensure that all of the expressions within the assignment pattern here happen to be good net_lvalues. We'll recognize these expressions with vl-expr-net-lvalue-p.

Subtopics

Vl-exprlist-net-lvalues-p

Vl-assignpat-net-lvalue-p