[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

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@330857 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 21 insertions, 0 deletions

diff --git a/test/scudo/stats.c b/test/scudo/stats.c
new file mode 100644
index 000000000..e7cc78ff0
--- /dev/null
+++ b/test/scudo/stats.c
@@ -0,0 +1,21 @@
+// RUN: %clang_scudo %s -o %t
+// RUN: %run %t 2>&1 | FileCheck %s
+
+// Tests that the allocator stats printing function exists and outputs
+// "something". Currently that "something" is fairly nebulous, as the 32-bit
+// primary doesn't output anything, and for the 64-bit one it's highly dependent
+// on the size class map and potential library allocations. So keep it very
+// generic for now.
+
+#include <stdlib.h>
+
+#include <sanitizer/scudo_interface.h>
+
+int main(int argc, char **argv)
+{
+  free(malloc(1U));
+  __scudo_print_stats();
+  return 0;
+}
+
+// CHECK: Stats: