[NFC][msan] Rename SymbolizerScope to UnwinderScope and hide

Author: vitalybuka

compiler-rt/lib/msan/msan.cpp

@@ -69,8 +69,6 @@ THREADLOCAL u64 __msan_va_arg_overflow_size_tls;
 SANITIZER_INTERFACE_ATTRIBUTE
 THREADLOCAL u32 __msan_origin_tls;
 
-static THREADLOCAL int is_in_symbolizer;
-
 extern "C" SANITIZER_WEAK_ATTRIBUTE const int __msan_track_origins;
 
 int __msan_get_track_origins() {
@@ -81,15 +79,19 @@ extern "C" SANITIZER_WEAK_ATTRIBUTE const int __msan_keep_going;
 
 namespace __msan {
 
-void EnterSymbolizer() { ++is_in_symbolizer; }
-void ExitSymbolizer()  { --is_in_symbolizer; }
-bool IsInSymbolizer() { return is_in_symbolizer; }
+static THREADLOCAL int is_in_symbolizer_or_unwinder;
+static void EnterSymbolizerOrUnwider() { ++is_in_symbolizer_or_unwinder; }
+static void ExitSymbolizerOrUnwider() { --is_in_symbolizer_or_unwinder; }
+bool IsInSymbolizerOrUnwider() { return is_in_symbolizer_or_unwinder; }
+
+struct UnwinderScope {
+  UnwinderScope() { EnterSymbolizerOrUnwider(); }
+  ~UnwinderScope() { ExitSymbolizerOrUnwider(); }
+};
 
 static Flags msan_flags;
 
-Flags *flags() {
-  return &msan_flags;
-}
+Flags *flags() { return &msan_flags; }
 
 int msan_inited = 0;
 bool msan_init_is_running;
@@ -301,15 +303,15 @@ u32 ChainOrigin(u32 id, StackTrace *stack) {
   return chained.raw_id();
 }
 
-} // namespace __msan
+}  // namespace __msan
 
 void __sanitizer::BufferedStackTrace::UnwindImpl(
     uptr pc, uptr bp, void *context, bool request_fast, u32 max_depth) {
   using namespace __msan;
   MsanThread *t = GetCurrentThread();
   if (!t || !StackTrace::WillUseFastUnwind(request_fast)) {
     // Block reports from our interceptors during _Unwind_Backtrace.
-    SymbolizerScope sym_scope;
+    UnwinderScope sym_scope;
     return Unwind(max_depth, pc, bp, context, t ? t->stack_top() : 0,
                   t ? t->stack_bottom() : 0, false);
   }
@@ -462,7 +464,8 @@ void __msan_init() {
     Die();
   }
 
-  Symbolizer::GetOrInit()->AddHooks(EnterSymbolizer, ExitSymbolizer);
+  Symbolizer::GetOrInit()->AddHooks(EnterSymbolizerOrUnwider,
+                                    ExitSymbolizerOrUnwider);
 
   InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
 

compiler-rt/lib/msan/msan.h

@@ -314,14 +314,7 @@ void InstallAtExitHandler();
 
 const char *GetStackOriginDescr(u32 id, uptr *pc);
 
-void EnterSymbolizer();
-void ExitSymbolizer();
-bool IsInSymbolizer();
-
-struct SymbolizerScope {
-  SymbolizerScope() { EnterSymbolizer(); }
-  ~SymbolizerScope() { ExitSymbolizer(); }
-};
+bool IsInSymbolizerOrUnwider();
 
 void PrintWarning(uptr pc, uptr bp);
 void PrintWarningWithOrigin(uptr pc, uptr bp, u32 origin);

compiler-rt/lib/msan/msan_interceptors.cpp

@@ -90,7 +90,8 @@ struct DlsymAlloc : public DlSymAllocator<DlsymAlloc> {
 #define CHECK_UNPOISONED_0(x, n)                                  \
   do {                                                            \
     sptr __offset = __msan_test_shadow(x, n);                     \
-    if (__msan::IsInSymbolizer()) break;                          \
+    if (__msan::IsInSymbolizerOrUnwider())                        \
+      break;                                                      \
     if (__offset >= 0 && __msan::flags()->report_umrs) {          \
       GET_CALLER_PC_BP_SP;                                        \
       (void)sp;                                                   \
@@ -1599,7 +1600,7 @@ void __msan_clear_and_unpoison(void *a, uptr size) {
 
 void *__msan_memcpy(void *dest, const void *src, SIZE_T n) {
   if (!msan_inited) return internal_memcpy(dest, src, n);
-  if (msan_init_is_running || __msan::IsInSymbolizer())
+  if (msan_init_is_running || __msan::IsInSymbolizerOrUnwider())
     return REAL(memcpy)(dest, src, n);
   ENSURE_MSAN_INITED();
   GET_STORE_STACK_TRACE;