[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, 12 insertions, 4 deletions

diff --git a/lib/scudo/standalone/tests/secondary_test.cpp b/lib/scudo/standalone/tests/secondary_test.cpp
index 84c375449..b602b8d63 100644
--- a/lib/scudo/standalone/tests/secondary_test.cpp
+++ b/lib/scudo/standalone/tests/secondary_test.cpp
@@ -45,7 +45,9 @@ TEST(ScudoSecondaryTest, SecondaryBasic) {
     L->deallocate(V.back());
     V.pop_back();
   }
-  L->printStats();
+  scudo::ScopedString Str(1024);
+  L->getStats(&Str);
+  Str.output();
 }
 
 // This exercises a variety of combinations of size and alignment for the
@@ -76,7 +78,9 @@ TEST(ScudoSecondaryTest, SecondaryCombinations) {
       }
     }
   }
-  L->printStats();
+  scudo::ScopedString Str(1024);
+  L->getStats(&Str);
+  Str.output();
 }
 
 TEST(ScudoSecondaryTest, SecondaryIterate) {
@@ -97,7 +101,9 @@ TEST(ScudoSecondaryTest, SecondaryIterate) {
     L->deallocate(V.back());
     V.pop_back();
   }
-  L->printStats();
+  scudo::ScopedString Str(1024);
+  L->getStats(&Str);
+  Str.output();
 }
 
 static std::mutex Mutex;
@@ -133,5 +139,7 @@ TEST(ScudoSecondaryTest, SecondaryThreadsRace) {
   }
   for (auto &T : Threads)
     T.join();
-  L->printStats();
+  scudo::ScopedString Str(1024);
+  L->getStats(&Str);
+  Str.output();
 }