Parser Error When There is No Traced Signal

[qrqiuren]

After running sampled pnoise simulation in spectre, one of the generated psf file records jitter event time as in the attachment.

pnoiseMpm0.sample.pnoise.gz

Traceback info:

Traceback (most recent call last):
  File "/home/xxx/miniforge3/lib/python3.10/site-packages/psf_utils/psf.py", line 104, in __init__
    sections = parser.parse(filename, content)
  File "/home/xxx/miniforge3/lib/python3.10/site-packages/psf_utils/parse.py", line 539, in parse
    result = self.parser.parse(content, tracking=False, lexer=self.lexer)
  File "/home/xxx/miniforge3/lib/python3.10/site-packages/ply/yacc.py", line 331, in parse
    return self.parseopt_notrack(input, lexer, debug, tracking, tokenfunc)
  File "/home/xxx/miniforge3/lib/python3.10/site-packages/ply/yacc.py", line 1199, in parseopt_notrack
    tok = call_errorfunc(self.errorfunc, errtoken, self)
  File "/home/xxx/miniforge3/lib/python3.10/site-packages/ply/yacc.py", line 193, in call_errorfunc
    r = errorfunc(token)
  File "/home/xxx/miniforge3/lib/python3.10/site-packages/psf_utils/parse.py", line 524, in p_error
    raise ParseError("syntax error at '%s'." % (p.value), loc)
psf_utils.parse.ParseError: run/psf/pnoiseMpm0.sample.pnoise(134): syntax error at 'VALUE'.
    VALUE
    ^

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/xxx/src/spectre/noise_tb_sim/read_psf.py", line 111, in <module>
    psf_pnoise_sample = PSF("run/psf/pnoiseMpm0.sample.pnoise")
  File "/home/xxx/miniforge3/lib/python3.10/site-packages/psf_utils/psf.py", line 106, in __init__
    raise Error(str(e))
inform.inform.Error: run/psf/pnoiseMpm0.sample.pnoise(134): syntax error at 'VALUE'.
    VALUE
    ^

psf_utils is in version 1.8.0.

[qrqiuren]

Just found a quick fix by adding the following function to parse.py:

def p_traces_empty(p):
    "traces : "
    p[0] = []

If possible, I will create a merge request. @KenKundert

[KenKundert]

I added you code to fixed this. The fix is on github.

[qrqiuren]

It seems that after updating to latest spectre, it does not generate a Trace section with only a keyword TRACE. Instead, the whole section does not show. So I added the following function in parse.py:

def p_contents_without_trace(p):
    "contents : header_section type_section sweep_section value_section end"
    p[0] = (p[1], p[2], p[3], None, p[4])

And in line 180 of psf.py, I temporarily fixed the assertion like this (because this case is not DC simulation):

                # assert len(value.values) == 1
                if len(value.values) != 1:
                    break

The example input file:
pnoiseMpm0.sample.pnoise.gz