[compiler-rt] r323755 - [XRay] [compiler-rt] stop writing garbage in naive log records

[Martin Pelikan via llvm-commits]

Author: pelikan
Date: Tue Jan 30 05:25:25 2018
New Revision: 323755

URL: http://llvm.org/viewvc/llvm-project?rev=323755&view=rev
Log:
[XRay] [compiler-rt] stop writing garbage in naive log records

Summary:
Turns out sizeof(packed) isn't as strong as we'd hoped.  This makes sure
that when we initialize the padding, all 12 bytes will be zero.

Reviewers: dberris, kpw, eizan

Subscribers: delcypher, llvm-commits, #sanitizers

Differential Revision: https://reviews.llvm.org/D42494

Modified:
    compiler-rt/trunk/include/xray/xray_records.h

Modified: compiler-rt/trunk/include/xray/xray_records.h
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/include/xray/xray_records.h?rev=323755&r1=323754&r2=323755&view=diff
==============================================================================
--- compiler-rt/trunk/include/xray/xray_records.h (original)
+++ compiler-rt/trunk/include/xray/xray_records.h Tue Jan 30 05:25:25 2018
@@ -96,7 +96,7 @@ struct alignas(32) XRayRecord {
   uint32_t TId = 0;
 
   // Use some bytes in the end of the record for buffers.
-  char Buffer[4] = {};
+  char Buffer[12] = {};
 } __attribute__((packed));
 
 static_assert(sizeof(XRayRecord) == 32, "XRayRecord != 32 bytes");