[compiler-rt] r334716 - [scudo] Make Secondary linker-initialized compliant

[Kostya Kortchinsky via llvm-commits]

Author: cryptoad
Date: Thu Jun 14 07:33:28 2018
New Revision: 334716

URL: http://llvm.org/viewvc/llvm-project?rev=334716&view=rev
Log:
[scudo] Make Secondary linker-initialized compliant

Summary:
As a follow up to D48142 for Scudo, switch the `SpinMutex` to its static
counterpart, and ensure zero-initialization by memset'ing the whole class.

Reviewers: alekseyshl

Reviewed By: alekseyshl

Subscribers: delcypher, #sanitizers, llvm-commits

Differential Revision: https://reviews.llvm.org/D48148

Modified:
    compiler-rt/trunk/lib/scudo/scudo_allocator_secondary.h

Modified: compiler-rt/trunk/lib/scudo/scudo_allocator_secondary.h
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/scudo/scudo_allocator_secondary.h?rev=334716&r1=334715&r2=334716&view=diff
==============================================================================
--- compiler-rt/trunk/lib/scudo/scudo_allocator_secondary.h (original)
+++ compiler-rt/trunk/lib/scudo/scudo_allocator_secondary.h Thu Jun 14 07:33:28 2018
@@ -69,11 +69,7 @@ namespace LargeChunk {
 class ScudoLargeMmapAllocator {
  public:
   void Init() {
-    NumberOfAllocs = 0;
-    NumberOfFrees = 0;
-    AllocatedBytes = 0;
-    FreedBytes = 0;
-    LargestSize = 0;
+    internal_memset(this, 0, sizeof(*this));
   }
 
   void *Allocate(AllocatorStats *Stats, uptr Size, uptr Alignment) {
@@ -186,7 +182,7 @@ class ScudoLargeMmapAllocator {
   static constexpr uptr HeadersSize =
       LargeChunk::getHeaderSize() + Chunk::getHeaderSize();
 
-  SpinMutex StatsMutex;
+  StaticSpinMutex StatsMutex;
   u32 NumberOfAllocs;
   u32 NumberOfFrees;
   uptr AllocatedBytes;