[XRay][compiler-rt] Support in-memory processing of FDR mode logs
Summary:
This change allows for handling the in-memory data associated with the
FDR mode implementation through the new `__xray_log_process_buffers`
API. With this change, we can now allow users to process the data
in-memory of the process instead of through writing files.
This for example allows users to stream the data of the FDR logging
implementation through network sockets, or through other mechanisms
instead of saving them to local files.
We introduce an FDR-specific flag, for "no_file_flush" which lets the
flushing logic skip opening/writing to files.
This option can be defaulted to `true` when building the compiler-rt
XRay runtime through the `XRAY_FDR_OPTIONS` preprocessor macro.
Reviewers: kpw, echristo, pelikan, eizan
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D46574
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@332208 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/xray/xray_fdr_flags.inc b/lib/xray/xray_fdr_flags.inc
index 7815738..d8721ad 100644
--- a/lib/xray/xray_fdr_flags.inc
+++ b/lib/xray/xray_fdr_flags.inc
@@ -25,3 +25,5 @@
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.")
+XRAY_FLAG(bool, no_file_flush, false,
+ "Set to true to not write log files by default.")
