[PATCH] D30018: [XRay] Add __xray_customeevent(...) as a clang-supported builtin

[Dean Michael Berris via Phabricator via cfe-commits]

dberris created this revision.
Herald added a subscriber: mehdi_amini.

We define the `__xray_customeevent` builtin that gets translated to
IR calls to the correct intrinsic. The default implementation of this is
a no-op function. The codegen side of this follows the following logic:

- When `-fxray-instrument` is not provided in the driver, we elide all

calls to `__xray_customevent`.

- When `-fxray-instrument` is enabled and a function is marked as "never

instrumented", we elide all calls to `__xray_customevent` in that
function; if either marked as "always instrumented" or subject to
threshold-based instrumentation, we emit a call to the
`llvm.xray.customevent` intrinsic from LLVM for each
`__xray_customevent` occurrence in the function.

This change depends on https://reviews.llvm.org/D27503 (to land in LLVM first).


https://reviews.llvm.org/D30018

Files:
  include/clang/Basic/Builtins.def
  lib/CodeGen/CGBuiltin.cpp
  lib/Headers/xrayintrin.h
  test/CodeGen/xray-customevent.cpp

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