Add a note on fuzzers, with a polite suggestion that if you're fuzzing you should put in the work of identifying the underlying issue so that you (and we) are confident you're not raising multiple issues for the same bug.
Also dropping the `autosectionlabel_maxdepth = 1` so that I can actually use the auto section labels.
Adds warning on bash substitution on scripting intro page when talking about `yosys -p`.
Talk about input files coming from command line, the `read` command, and features provided by `RTLIL::Frontend` (making note that `read_slang` is a subclass but `ghdl` isn't).
- Make IdString parameter pass by const ref to avoid IdString ref counting in the constructor
- Remove extra std::string allocation to remove prefix
- Avoid using `stringf` for concatenation
dict is pretty slow when you don't ever need to iterate the container in
order. And the hashfunction for char* in dict hashes for every single
byte in the string, likely doing significantly more work than std::hash.
Checking only happens at compile time if -std=c++20 (or greater) is enabled. Otherwise
the checking happens at run time.
This requires the format string to be a compile-time constant (when compiling with
C++20), so fix a few places where that isn't true.
The format string behavior is a bit more lenient than C printf. For %d/%u
you can pass any integer type and it will be converted and output without
truncating bits, i.e. any length specifier is ignored and the conversion is
always treated as 'll'. Any truncation needs to be done by casting the argument itself.
For %f/%g you can pass anything that converts to double, including integers.
Performance results with clang 19 -O3 on Linux:
```
hyperfine './yosys -dp "read_rtlil /usr/local/google/home/rocallahan/Downloads/jpeg.synth.il; dump"'
```
C++17 before: Time (mean ± σ): 101.3 ms ± 0.8 ms [User: 85.6 ms, System: 15.6 ms]
C++17 after: Time (mean ± σ): 98.4 ms ± 1.2 ms [User: 82.1 ms, System: 16.1 ms]
C++20 before: Time (mean ± σ): 100.9 ms ± 1.1 ms [User: 87.0 ms, System: 13.8 ms]
C++20 after: Time (mean ± σ): 97.8 ms ± 1.4 ms [User: 83.1 ms, System: 14.7 ms]
The generated code is reasonably efficient. E.g. with clang 19, `stringf()` with a format
with no %% escapes and no other parameters (a weirdly common case) often compiles to a fully
inlined `std::string` construction. In general the format string parsing is often (not always)
compiled away.
`-greperr <string>` redirects stderr to 'bugpoint-case.err', and then searches that file for `<string>`.
Move `-runner` option up with the other options to reduce ambiguity (i.e. so it doesn't look like it's another design parts constraint).
Also some shuffling of `err.ys`.
Allows checking return value from crashing design. Makes it possible to only accept designs that crash with e.g. SEGFAULT.
Based on `exec -expect-return`.
