Dean Michael Berris 9b57ca171d [XRay] [compiler-rt] Write buffer length to FDR log before writing buffer. ... Summary: Currently the FDR log writer, upon flushing, dumps a sequence of buffers from its freelist to disk. A reader can read the first buffer up to an EOB record, but then it is unclear how far ahead to scan to find the next threads traces. There are a few ways to handle this problem. 1. The reader has externalized knowledge of the buffer size. 2. The size of buffers is in the file header or otherwise encoded in the log. 3. Only write out the portion of the buffer with records. When released, the buffers are marked with a size. 4. The reader looks for memory that matches a pattern and synchronizes on it. 2 and 3 seem the most flexible and 2 does not rule 3 out. This is an implementation of 2. In addition, the function handler for fdr more aggressively checks for finalization and makes an attempt to release its buffer. Reviewers: pelikan, dberris Reviewed By: dberris Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D31384 llvm-svn: 298982		2017-03-29 05:56:37 +00:00
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xray_interface.h	[XRay] [compiler-rt] Allow logging the first argument of a function call.	2017-03-06 07:25:41 +00:00
xray_log_interface.h	[XRay][compiler-rt] Add an end-to-end test for FDR Logging	2017-03-29 05:19:24 +00:00
xray_records.h	[XRay] [compiler-rt] Write buffer length to FDR log before writing buffer.	2017-03-29 05:56:37 +00:00