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• Parse-expressions

Vl-parse-parameter-value-assignment-hack

Ostensibly match a parameter_value_assignment within an expression.

Signature

(vl-parse-parameter-value-assignment-hack 
     &key (tokstream 'tokstream) 
     (config 'config)) 
 
  → 
(mv errmsg? value new-tokstream)

Arguments

config — Guard (vl-loadconfig-p config).

In Verilog-2005, parameter value assignments could only occur in module instances (e.g., you might instantiate an adder with #(.width(16)) or just #(16)). But in SystemVerilog-2012, they can now be embedded within certain kinds of casting and streaming concatenation expressions.

We don't see a very good way to support this in our current expression format. So, for now, if we actually encounter a parameter value assignment in one of these contexts, we'll just cause a parse error. If some day we actually need to support this, we might be able to add some new kind of fancy operator(s), e.g., a namedarg operator with an alternating list of name/value expressions.

Definitions and Theorems

Function: vl-parse-parameter-value-assignment-hack-fn

(defun vl-parse-parameter-value-assignment-hack-fn
       (tokstream config)
 (declare (xargs :stobjs (tokstream)))
 (declare (xargs :guard (vl-loadconfig-p config)))
 (declare (ignorable config))
 (let ((__function__ 'vl-parse-parameter-value-assignment-hack))
  (declare (ignorable __function__))
  (seq
   tokstream
   (:= (vl-match-token :vl-pound))
   (:= (vl-match-token :vl-lparen))
   (return-raw
    (vl-parse-error
     "Embedded parameter value assignments #(...) aren't implemented yet.")))))

Theorem: vl-parse-parameter-value-assignment-hack-fails-gracefully

(defthm vl-parse-parameter-value-assignment-hack-fails-gracefully
  (implies
       (mv-nth 0
               (vl-parse-parameter-value-assignment-hack))
       (not (mv-nth 1
                    (vl-parse-parameter-value-assignment-hack)))))

Theorem: vl-warning-p-of-vl-parse-parameter-value-assignment-hack

(defthm vl-warning-p-of-vl-parse-parameter-value-assignment-hack
 (iff
  (vl-warning-p (mv-nth 0
                        (vl-parse-parameter-value-assignment-hack)))
  (mv-nth 0
          (vl-parse-parameter-value-assignment-hack))))

Theorem: vl-parse-parameter-value-assignment-hack-result

(defthm vl-parse-parameter-value-assignment-hack-result
  (implies
       (and t)
       (not (mv-nth 1
                    (vl-parse-parameter-value-assignment-hack)))))

Theorem: vl-parse-parameter-value-assignment-hack-count-strong

(defthm vl-parse-parameter-value-assignment-hack-count-strong
 (and
  (<=
   (vl-tokstream-measure
     :tokstream (mv-nth 2
                        (vl-parse-parameter-value-assignment-hack)))
   (vl-tokstream-measure))
  (implies
   (not (mv-nth 0
                (vl-parse-parameter-value-assignment-hack)))
   (<
    (vl-tokstream-measure
     :tokstream (mv-nth 2
                        (vl-parse-parameter-value-assignment-hack)))
    (vl-tokstream-measure))))
 :rule-classes ((:rewrite) (:linear)))