[sanitizer] Implement a __asan_default_options() equivalent for Scudo

Summary:
Currently, the Scudo Hardened Allocator only gets its flags via the SCUDO_OPTIONS environment variable.
With this patch, we offer the opportunity for programs to define their own options via __scudo_default_options() which behaves like __asan_default_options() (weak symbol).
A relevant test has been added as well, and the documentation updated accordingly.
I also used this patch as an opportunity to rename a few variables to comply with the LLVM naming scheme, and replaced a use of Report with dieWithMessage for consistency (and to avoid a callback).

Reviewers: llvm-commits, kcc

Differential Revision: https://reviews.llvm.org/D23018

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@277536 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/scudo/scudo_allocator.cpp b/lib/scudo/scudo_allocator.cpp
index 3ad499aed..ceb7bbdd4 100644
--- a/lib/scudo/scudo_allocator.cpp
+++ b/lib/scudo/scudo_allocator.cpp
@@ -76,7 +76,7 @@ struct UnpackedHeader {
   u64 Offset        : 20; // Offset from the beginning of the backend
                           // allocation to the beginning chunk itself, in
                           // multiples of MinAlignment. See comment about its
-                          // maximum value and test in Initialize.
+                          // maximum value and test in init().
   u64 Unused_1_     : 28;
   u16 Salt          : 16;
 };