[UBSan] Embed UBSan into ASan runtime (compiler-rt part).

Summary:
Change the way we use ASan and UBSan together. Instead of keeping two
separate runtimes (libclang_rt.asan and libclang_rt.ubsan), embed UBSan
into ASan and get rid of libclang_rt.ubsan. If UBSan is not supported on
a platform, all UBSan sources are just compiled into dummy empty object
files. UBSan initialization code (e.g. flag parsing) is directly called
from ASan initialization, so we are able to enforce correct
initialization order.

This mirrors the approach we already use for ASan+LSan. This change
doesn't modify the way we use standalone UBSan.

Test Plan: regression test suite

Reviewers: kubabrecka, zaks.anna, rsmith, kcc

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8646

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@233861 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 8 insertions, 1 deletions

diff --git a/lib/ubsan/ubsan_flags.h b/lib/ubsan/ubsan_flags.h
index b47f14e1e..18aed9b05 100644
--- a/lib/ubsan/ubsan_flags.h
+++ b/lib/ubsan/ubsan_flags.h
@@ -15,6 +15,10 @@
 
 #include "sanitizer_common/sanitizer_internal_defs.h"
 
+namespace __sanitizer {
+class FlagParser;
+}
+
 namespace __ubsan {
 
 struct Flags {
@@ -28,7 +32,10 @@ struct Flags {
 extern Flags ubsan_flags;
 inline Flags *flags() { return &ubsan_flags; }
 
-void InitializeFlags(bool standalone);
+void InitializeFlags();
+void RegisterUbsanFlags(FlagParser *parser, Flags *f);
+
+const char *MaybeCallUbsanDefaultOptions();
 
 }  // namespace __ubsan