• Top
  • Documentation
  • Books
  • Boolean-reasoning
  • Projects
  • Debugging
  • Std
  • Proof-automation
  • Macro-libraries
  • ACL2
  • Interfacing-tools
  • Hardware-verification
    • Gl
    • Esim
    • Vl2014
    • Sv
    • Vwsim
    • Fgl
    • Vl
      • Syntax
      • Loader
      • Warnings
      • Getting-started
      • Utilities
      • Printer
      • Kit
      • Mlib
        • Scopestack
        • Hid-tools
        • Filtering-by-name
        • Vl-interface-mocktype
        • Stripping-functions
        • Genblob
        • Expr-tools
        • Extract-vl-types
        • Hierarchy
        • Range-tools
        • Finding-by-name
        • Stmt-tools
        • Modnamespace
        • Flat-warnings
        • Reordering-by-name
        • Datatype-tools
        • Syscalls
        • Allexprs
        • Lvalues
          • Lvaluecheck
          • Vl-expr-variable-lvalue-p
          • Vl-expr-net-lvalue-p
            • Vl-exprlist-net-lvalues-p
            • Vl-assignpat-net-lvalue-p
        • Port-tools
      • Transforms
    • X86isa
    • Svl
    • Rtl
  • Software-verification
  • Math
  • Testing-utilities

• 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