Original Redmine Comment
Author Name: Wilson Snyder (@wsnyder)
Original Date: 2015-08-27T12:30:50Z

Verilator only supports new-style file descriptors, not legacy multi-channel descriptors. This is unlikely to change unless you'd like to contribute a patch to do so - if you'd like pointers of how to do that just ask.

Original Redmine Comment
Author Name: Wei Song
Original Date: 2015-08-27T12:42:31Z

I would like to try but it seems related to a lot components.

So the limited target would be supporting only stdin, stdout and stderr.

According to my understanding, I need to:

1. Change the verilog.y to ask parser recognise the special number as
   pre-opened descriptors.

2. Pre-open the necessary std channels in C++/SystemC.

3. Close the channels when necessary.

Some guidance on these?

Pointer to related files would be great.

Original Redmine Comment
Author Name: Wilson Snyder (@wsnyder)
Original Date: 2015-08-27T12:56:19Z

The stdin/out/err channels will already be open. You want to use the number computed at runtime, not parse time.

First, make a standalone test in test_regress format (see the docs) that passes on other sims and fails on verilator.

Then, you'll see a message like "Unsupported: $fopen/$fclose/$f* descriptor must be a simple variable" this is made by V3LinkResolve. Change that to accept an AstConst (constant) and check that the value only has stdout/stderr bits set.

There might be some minor changes but eventually the code will verilate.

Then fix include/verilated.h/cpp to fix the VL_FWRITEF runtime code to understand the magic values -- you'll see it calls VL_CVT_I_FP to make a file pointer instead this will need to return a list of stdout and stderr.

Original Redmine Comment
Author Name: Wilson Snyder (@wsnyder)
Original Date: 2015-10-24T01:53:22Z

Fixed in git towards 3.878.

Original Redmine Comment
Author Name: Wilson Snyder (@wsnyder)
Original Date: 2015-10-24T01:53:48Z

Fixed in git towards 3.878.

Original Redmine Comment
Author Name: Wilson Snyder (@wsnyder)
Original Date: 2015-11-01T13:23:18Z

In 3.878.