[XRay][compiler-rt] Support string-based config for FDR mode
Summary:
In this chage we add support for the string-based configuration
mechanism for configuring FDR mode.
We deprecate most of the `xray_fdr_log_*` flags that are set with the
`XRAY_OPTIONS` environment variable. Instead we make the FDR
implementation take defaults from the `XRAY_FDR_OPTIONS` environment
variable, and use the flags defined in `xray_fdr_flags.{h,cc,inc}` for
the options we support.
This change addresses http://llvm.org/PR36790.
Depends on D46173.
Reviewers: eizan, pelikan, kpw, echristo
Subscribers: llvm-commits, mgorny
Differential Revision: https://reviews.llvm.org/D46174
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@331506 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/xray/xray_fdr_flags.inc b/lib/xray/xray_fdr_flags.inc
new file mode 100644
index 0000000..7815738
--- /dev/null
+++ b/lib/xray/xray_fdr_flags.inc
@@ -0,0 +1,27 @@
+//===-- xray_fdr_flags.inc --------------------------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// XRay FDR Mode runtime flags.
+//
+//===----------------------------------------------------------------------===//
+#ifndef XRAY_FLAG
+#error "Define XRAY_FLAG prior to including this file!"
+#endif
+
+// FDR (Flight Data Recorder) Mode logging options.
+XRAY_FLAG(int, func_duration_threshold_us, 5,
+ "FDR logging will try to skip functions that execute for fewer "
+ "microseconds than this threshold.")
+XRAY_FLAG(int, grace_period_ms, 100,
+ "FDR logging will wait this much time in milliseconds before "
+ "actually flushing the log; this gives a chance for threads to "
+ "notice that the log has been finalized and clean up.")
+XRAY_FLAG(int, buffer_size, 16384,
+ "Size of buffers in the circular buffer queue.")
+XRAY_FLAG(int, buffer_max, 100, "Maximum number of buffers in the queue.")
