CODEWITHSUNDEEP
verilogsystem-verilogvpi
user2756376
user2756376

Reputation: 117

Allocated structure for value_p to be used with VPI vpi_put_value()

I'm implementing Verilog "force" and "release" using VPI so that they can be called from C routines. To force a value to a vector net, I need to create an array of s_vpi_vecval for value_p. I allocated a storage for the array and populated it with the value I want. Then I used vpi_put_value() to force the vector value to the net.

The standard, IEEE 1800, clearly says that the calling routine needs to allocate a space for such structure for value_p. But it didn't say when it is safe to free the storage. Is it safe to free the storage just after calling vpi_put_value()?

I assume, the vpi_put_value() will keep a copy of the force value in their side. Any insights to this are greatly appreciated.

Upvotes: 0

Views: 266

Answers (1)

dave_59
dave_59

Reputation: 42698

I think it is safe to assume you can free the memory after making the VPI call - this is how all other VPI routines work.

You can easily test this by making two calls to dpi_put_value() using the same struct pointer.

I've put in a request to have the IEEE standard clarified.

Upvotes: 1

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