Rawtracepoint support wildcards and list show

[zf1575192187]

1: Rawtracepoint support wildcards and list show
2: Add testcases for rawtracepoint's wildcards and list show

[viktormalik]

A runtime test for an actual attachment to a wildcarded raw tracepoint would be useful.

Other than that looks good to me, thanks!

[viktormalik]

I just realized that this is not properly handling argX for wildcarded probes.
Example:

# bpftrace -e 'rawtracepoint:mm_* { printf("%d\n", arg1); exit(); }'
Attaching 50 probes...
ERROR: Error attaching probe: rawtracepoint:mm_compaction_kcompactd_sleep

mm_compaction_kcompactd_sleep has only one argument so the verifier rejects to attach the above program to it. We should address this in semantic analyzer and provide a reasonable error message.

[zf1575192187]

Ok, thanks for helping with the test, I'll check it out.

[zf1575192187]

Considering that it is difficult to obtain the number of parameters of rawtracepoint,
whether it can be handled simply, and prompt after judging the error

else if (tracing_fd_ == -EINVAL)
      throw std::runtime_error("Error attaching probe: " + probe_.name + ", \
        Maybe access arguments beyond what's available in this tracepoint");

@viktormalik What do you think, or is there a better way

[viktormalik]

Considering that it is difficult to obtain the number of parameters of rawtracepoint, whether it can be handled simply, and prompt after judging the error

else if (tracing_fd_ == -EINVAL)
      throw std::runtime_error("Error attaching probe: " + probe_.name + ", \
        Maybe access arguments beyond what's available in this tracepoint");

@viktormalik What do you think, or is there a better way

Right, I didn't realize that. Checking the error code and printing a hint seems like a reasonable approach to me.

[zf1575192187]

Done

[viktormalik]

One more nit below, otherwise lgtm, thanks! Also, I'm gonna squash the commits on merging, if you don't mind.

[viktormalik]

Ah, we'll need a CHANGELOG update, too. Thanks!

[zf1575192187]

Done