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preprocessor: do not destroy double slash escaped identifiers

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The preprocessor currently destroys double slash containing escaped
identifiers (for example \a//b ). This is due to next_token trying to
convert single line comments (//) into /* */ comments. This then leads
to an unintuitive error message like this:
ERROR: syntax error, unexpected '*'

This patch fixes the error by recognizing escaped identifiers and
returning them as single token. It also adds a testcase.
This commit is contained in:
Thomas Sailer 2021-08-25 21:34:26 +02:00 • committed by Zachary Snow
parent 477eeefd9b
commit 4cd2f03e36
2 changed files with 29 additions and 0 deletions
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10
frontends/verilog/preproc.cc
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@ -142,6 +142,16 @@ static std::string next_token(bool pass_newline = false)
return_char(ch);
}
}
else if (ch == '\\')
{
while ((ch = next_char()) != 0) {
if (ch < 33 || ch > 126) {
return_char(ch);
break;
}
token += ch;
}
}
else if (ch == '/')
{
if ((ch = next_char()) != 0) {