[scudo][standalone] Get statistics in a char buffer

Summary:
Following up on D68471, this CL introduces some `getStats` APIs to
gather statistics in char buffers (`ScopedString` really) instead of
printing them out right away. Ultimately `printStats` will just
output the buffer, but that allows us to potentially do some work
on the intermediate buffer, and can be used for a `mallocz` type
of functionality. This allows us to pretty much get rid of all the
`Printf` calls around, but I am keeping the function in for
debugging purposes.

This changes the existing tests to use the new APIs when required.

I will add new tests as suggested in D68471 in another CL.

Reviewers: morehouse, hctim, vitalybuka, eugenis, cferris

Reviewed By: morehouse

Subscribers: delcypher, #sanitizers, llvm-commits

Tags: #llvm, #sanitizers

Differential Revision: https://reviews.llvm.org/D68653

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@374173 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 2 deletions

diff --git a/lib/scudo/standalone/tests/quarantine_test.cpp b/lib/scudo/standalone/tests/quarantine_test.cpp
index d7453aa42..28baf8feb 100644
--- a/lib/scudo/standalone/tests/quarantine_test.cpp
+++ b/lib/scudo/standalone/tests/quarantine_test.cpp
@@ -213,7 +213,9 @@ TEST(ScudoQuarantineTest, GlobalQuarantine) {
   Quarantine.drainAndRecycle(&Cache, Cb);
   EXPECT_EQ(Cache.getSize(), 0UL);
 
-  Quarantine.printStats();
+  scudo::ScopedString Str(1024);
+  Quarantine.getStats(&Str);
+  Str.output();
 }
 
 void *populateQuarantine(void *Param) {
@@ -236,5 +238,7 @@ TEST(ScudoQuarantineTest, ThreadedGlobalQuarantine) {
   for (scudo::uptr I = 0; I < NumberOfThreads; I++)
     pthread_join(T[I], 0);
 
-  Quarantine.printStats();
+  scudo::ScopedString Str(1024);
+  Quarantine.getStats(&Str);
+  Str.output();
 }