[sanitizer] Move interceptor initialization check into real_clock_get…

…time

Reviewers: cryptoad, kubamracek

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D53777

llvm-svn: 345556

compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc

@@ -2149,6 +2149,8 @@ INTERCEPTOR(int, clock_gettime, u32 clk_id, void *tp) {
 namespace __sanitizer {
 extern "C" {
 int real_clock_gettime(u32 clk_id, void *tp) {
+  if (COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED)
+    return internal_clock_gettime(clk_id, tp);
   return REAL(clock_gettime)(clk_id, tp);
 }
 }  // extern "C"

compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cc

@@ -782,15 +782,12 @@ INLINE bool CanUseVDSO() {
 
 // MonotonicNanoTime is a timing function that can leverage the vDSO by calling
 // clock_gettime. real_clock_gettime only exists if clock_gettime is
-// intercepted, so define it weakly and use it if available. MonotonicNanoTime
-// might also be called when interceptors are not yet initialized, so check for
-// that as well.
+// intercepted, so define it weakly and use it if available.
 extern "C" SANITIZER_WEAK_ATTRIBUTE
 int real_clock_gettime(u32 clk_id, void *tp);
-namespace __interception { int (*real_clock_gettime)(u32 clk_id, void *tp); }
 u64 MonotonicNanoTime() {
   timespec ts;
-  if (CanUseVDSO() && __interception::real_clock_gettime) {
+  if (CanUseVDSO()) {
     if (&real_clock_gettime)
       real_clock_gettime(CLOCK_MONOTONIC, &ts);
     else