Implement RFC 3917 for instrumented functions#153742
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This attribute enables or disables function instrumentation when using `-Zinstrument-xray` or `-Zinstrument-mcount`. It supports the following usage: `#[instrument_fn = "on|off"]` For XRay, "on" is equivalent to always instrument, and "off" is equivalent to never instrumenting. For mcount, "on" has no effect. "off" disables instrumentation of the function. TODO: make and update tracking issue
The behavior is very similar to `-Zinstrument-mcount`, except this option has no frame-pointer requirements, and is called before the call frame is set up. This only works on x86, x86-64, and s390x targets.
This facilitates support for inserting nop's and/or recording the location of each mcount call in a special section named `__mcount_loc`.
Convert these into `-Zinstrument-function={none|fentry|xray}`.
`-Zinstrument-xray` is split into `-Zinstrument-function=xray` and
`-Zinstrument-xray-opts=...`.
Also, rename `-Zinstrument-mcount-opts` to `-Zinstrument-fentry-opts` to
reflect it is only usable with fentry. In theory, it could work with
both (as it does on gcc), in practice the llvm support is limited to
s390x/fentry as of llvm 22.
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This adds:
-Zinstrument-function={mcount,fentry,xray,none}option-Zinstrument-fentry-opts=.... This is probably only needed for linux.-Zinstrument-xrayis renamed to-Zinstrument-xray-optsand the yes/no/implicit option are removed.#[instrument_fn="on|off"]attribute for toggling instrumentation on select functions.