[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, 1 insertions, 0 deletions

diff --git a/lib/scudo/standalone/string_utils.h b/lib/scudo/standalone/string_utils.h
index aea7b3ffd..acd60bda9 100644
--- a/lib/scudo/standalone/string_utils.h
+++ b/lib/scudo/standalone/string_utils.h
@@ -29,6 +29,7 @@ public:
   }
   void append(const char *Format, va_list Args);
   void append(const char *Format, ...);
+  void output() const { outputRaw(String.data()); }
 
 private:
   Vector<char> String;