[scudo] Only print stats when the test fails. (llvm#168000)

When running the tests on other platforms, printing the stats on all of
the passing tests makes it hard to see failure output. Therefore, this
change only prints the stats if the test actually fails.

Author: cferris1000

compiler-rt/lib/scudo/standalone/tests/combined_test.cpp

@@ -326,8 +326,10 @@ void ScudoCombinedTest<Config>::BasicTest(scudo::uptr SizeLog) {
     }
   }
 
-  Allocator->printStats();
-  Allocator->printFragmentationInfo();
+  if (TEST_HAS_FAILURE) {
+    Allocator->printStats();
+    Allocator->printFragmentationInfo();
+  }
 }
 
 #define SCUDO_MAKE_BASIC_TEST(SizeLog)                                         \

compiler-rt/lib/scudo/standalone/tests/primary_test.cpp

@@ -230,9 +230,11 @@ SCUDO_TYPED_TEST(ScudoPrimaryTest, BasicPrimary) {
   }
   SizeClassAllocator.destroy(nullptr);
   Allocator->releaseToOS(scudo::ReleaseToOS::Force);
-  scudo::ScopedString Str;
-  Allocator->getStats(&Str);
-  Str.output();
+  if (TEST_HAS_FAILURE) {
+    scudo::ScopedString Str;
+    Allocator->getStats(&Str);
+    Str.output();
+  }
 }
 
 struct SmallRegionsConfig {
@@ -289,10 +291,12 @@ TEST(ScudoPrimaryTest, Primary64OOM) {
 
   SizeClassAllocator.destroy(nullptr);
   Allocator.releaseToOS(scudo::ReleaseToOS::Force);
-  scudo::ScopedString Str;
-  Allocator.getStats(&Str);
-  Str.output();
   EXPECT_EQ(AllocationFailed, true);
+  if (TEST_HAS_FAILURE) {
+    scudo::ScopedString Str;
+    Allocator.getStats(&Str);
+    Str.output();
+  }
   Allocator.unmapTestOnly();
 }
 
@@ -328,9 +332,11 @@ SCUDO_TYPED_TEST(ScudoPrimaryTest, PrimaryIterate) {
   }
   SizeClassAllocator.destroy(nullptr);
   Allocator->releaseToOS(scudo::ReleaseToOS::Force);
-  scudo::ScopedString Str;
-  Allocator->getStats(&Str);
-  Str.output();
+  if (TEST_HAS_FAILURE) {
+    scudo::ScopedString Str;
+    Allocator->getStats(&Str);
+    Str.output();
+  }
 }
 
 SCUDO_TYPED_TEST(ScudoPrimaryTest, PrimaryThreaded) {
@@ -385,11 +391,13 @@ SCUDO_TYPED_TEST(ScudoPrimaryTest, PrimaryThreaded) {
   for (auto &T : Threads)
     T.join();
   Allocator->releaseToOS(scudo::ReleaseToOS::Force);
-  scudo::ScopedString Str;
-  Allocator->getStats(&Str);
-  Allocator->getFragmentationInfo(&Str);
-  Allocator->getMemoryGroupFragmentationInfo(&Str);
-  Str.output();
+  if (TEST_HAS_FAILURE) {
+    scudo::ScopedString Str;
+    Allocator->getStats(&Str);
+    Allocator->getFragmentationInfo(&Str);
+    Allocator->getMemoryGroupFragmentationInfo(&Str);
+    Str.output();
+  }
 }
 
 // Through a simple allocation that spans two pages, verify that releaseToOS

compiler-rt/lib/scudo/standalone/tests/quarantine_test.cpp

@@ -216,9 +216,11 @@ TEST(ScudoQuarantineTest, GlobalQuarantine) {
   Quarantine.drainAndRecycle(&Cache, Cb);
   EXPECT_EQ(Cache.getSize(), 0UL);
 
-  scudo::ScopedString Str;
-  Quarantine.getStats(&Str);
-  Str.output();
+  if (TEST_HAS_FAILURE) {
+    scudo::ScopedString Str;
+    Quarantine.getStats(&Str);
+    Str.output();
+  }
 }
 
 struct PopulateQuarantineThread {
@@ -248,9 +250,11 @@ TEST(ScudoQuarantineTest, ThreadedGlobalQuarantine) {
   for (scudo::uptr I = 0; I < NumberOfThreads; I++)
     pthread_join(T[I].Thread, 0);
 
-  scudo::ScopedString Str;
-  Quarantine.getStats(&Str);
-  Str.output();
+  if (TEST_HAS_FAILURE) {
+    scudo::ScopedString Str;
+    Quarantine.getStats(&Str);
+    Str.output();
+  }
 
   for (scudo::uptr I = 0; I < NumberOfThreads; I++)
     Quarantine.drainAndRecycle(&T[I].Cache, Cb);

compiler-rt/lib/scudo/standalone/tests/size_class_map_test.cpp

@@ -12,8 +12,10 @@
 
 template <class SizeClassMap> void testSizeClassMap() {
   typedef SizeClassMap SCMap;
-  scudo::printMap<SCMap>();
   scudo::validateMap<SCMap>();
+  if (TEST_HAS_FAILURE) {
+    scudo::printMap<SCMap>();
+  }
 }
 
 TEST(ScudoSizeClassMapTest, DefaultSizeClassMap) {