[compiler-rt] Apply modernize-use-nullptr fixes in sanitizers

- Trim spaces.
- Use nullptr in place of 0 for pointer variables.
- Use '!p' in place of 'p == 0' for null pointer checks.
- Add blank lines to separate function definitions.
- Add 'extern "C"' or 'namespace foo' comments after the appropriate
  closing brackets

This is a continuation of work from 409b7b82. The focus here is on the
various sanitizers (not sanitizer_common, as before).

Patch by Eugene Zelenko!

Differential Revision: http://reviews.llvm.org/D13225

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@248966 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 5 deletions

diff --git a/lib/asan/asan_linux.cc b/lib/asan/asan_linux.cc
index 70f5d1708..804aef737 100644
--- a/lib/asan/asan_linux.cc
+++ b/lib/asan/asan_linux.cc
@@ -117,7 +117,7 @@ void AsanCheckDynamicRTPrereqs() {
     return;
 
   // Ensure that dynamic RT is the first DSO in the list
-  const char *first_dso_name = 0;
+  const char *first_dso_name = nullptr;
   dl_iterate_phdr(FindFirstDSOCallback, &first_dso_name);
   if (first_dso_name && !IsDynamicRTName(first_dso_name)) {
     Report("ASan runtime does not come first in initial library list; "
@@ -142,7 +142,8 @@ void AsanCheckIncompatibleRT() {
       // system libraries, causing crashes later in ASan initialization.
       MemoryMappingLayout proc_maps(/*cache_enabled*/true);
       char filename[128];
-      while (proc_maps.Next(0, 0, 0, filename, sizeof(filename), 0)) {
+      while (proc_maps.Next(nullptr, nullptr, nullptr, filename,
+                            sizeof(filename), nullptr)) {
         if (IsDynamicRTName(filename)) {
           Report("Your application is linked against "
                  "incompatible ASan runtimes.\n");
@@ -155,7 +156,7 @@ void AsanCheckIncompatibleRT() {
     }
   }
 }
-#endif  // SANITIZER_ANDROID
+#endif // SANITIZER_ANDROID
 
 #if !SANITIZER_ANDROID
 void ReadContextStack(void *context, uptr *stack, uptr *ssize) {
@@ -173,6 +174,6 @@ void *AsanDlSymNext(const char *sym) {
   return dlsym(RTLD_NEXT, sym);
 }
 
-}  // namespace __asan
+} // namespace __asan
 
-#endif  // SANITIZER_FREEBSD || SANITIZER_LINUX
+#endif // SANITIZER_FREEBSD || SANITIZER_LINUX