[scudo] Adding an interface function to print allocator stats

Summary:
This adds `__scudo_print_stats` as an interface function to display the Primary
and Secondary allocator statistics for Scudo.

Reviewers: alekseyshl, flowerhack

Reviewed By: alekseyshl

Subscribers: delcypher, llvm-commits, #sanitizers

Differential Revision: https://reviews.llvm.org/D46016

llvm-svn: 330857

1 files changed, 9 insertions, 0 deletions

diff --git a/compiler-rt/lib/scudo/scudo_allocator.cpp b/compiler-rt/lib/scudo/scudo_allocator.cpp
index e0f78a01542..c72ac8601ba 100644
--- a/compiler-rt/lib/scudo/scudo_allocator.cpp
+++ b/compiler-rt/lib/scudo/scudo_allocator.cpp
@@ -594,6 +594,11 @@ struct ScudoAllocator {
       SoftRssLimitMb = LimitMb;
     CheckRssLimit = HardRssLimitMb || SoftRssLimitMb;
   }
+
+  void printStats() {
+    initThreadMaybe();
+    BackendAllocator.printStats();
+  }
 };
 
 static ScudoAllocator Instance(LINKER_INITIALIZED);
@@ -743,3 +748,7 @@ void __scudo_set_rss_limit(uptr LimitMb, s32 HardLimit) {
     return;
   Instance.setRssLimit(LimitMb, !!HardLimit);
 }
+
+void __scudo_print_stats() {
+  Instance.printStats();
+}