Introduce a way to allow the ASan dylib on Darwin platforms to be loaded via `dlopen()`.

Summary:

The purpose of this option is provide a way for the ASan dylib
to be loaded via `dlopen()` without triggering most initialization
steps (e.g. shadow memory set up) that normally occur when the
ASan dylib is loaded.

This new functionality is exposed by

- A `SANITIZER_SUPPORTS_INIT_FOR_DLOPEN` macro which indicates if the
  feature is supported. This only true for Darwin currently.
- A `HandleDlopenInit()` function which should return true if the library
  is being loaded via `dlopen()` and
  `SANITIZER_SUPPORTS_INIT_FOR_DLOPEN` is supported. Platforms that
  support this may perform any initialization they wish inside this
  function.

Although disabling initialization is something that could potentially
apply to other sanitizers it appears to be unnecessary for other
sanitizers so this patch only makes the change for ASan.

rdar://problem/45284065

Reviewers: kubamracek, george.karpenkov, kcc, eugenis, krytarowski

Subscribers: #sanitizers, llvm-commits

Differential Revision: https://reviews.llvm.org/D54469

llvm-svn: 348078

1 files changed, 5 insertions, 0 deletions

diff --git a/compiler-rt/lib/asan/asan_internal.h b/compiler-rt/lib/asan/asan_internal.h
index 654878cd15f..57869497c7d 100644
--- a/compiler-rt/lib/asan/asan_internal.h
+++ b/compiler-rt/lib/asan/asan_internal.h
@@ -111,6 +111,11 @@ void *AsanDlSymNext(const char *sym);
 
 void ReserveShadowMemoryRange(uptr beg, uptr end, const char *name);
 
+// Returns `true` iff most of ASan init process should be skipped due to the
+// ASan library being loaded via `dlopen()`. Platforms may perform any
+// `dlopen()` specific initialization inside this function.
+bool HandleDlopenInit();
+
 // Add convenient macro for interface functions that may be represented as
 // weak hooks.
 #define ASAN_MALLOC_HOOK(ptr, size)                                   \