[NFC][sanitizer] Add consts to SkipInternalFrames (llvm#77162)

Author: vitalybuka

compiler-rt/lib/sanitizer_common/sanitizer_common.h

@@ -395,7 +395,7 @@ void ReportErrorSummary(const char *error_type, const AddressInfo &info,
 void ReportErrorSummary(const char *error_type, const StackTrace *trace,
                         const char *alt_tool_name = nullptr);
 // Skips frames which we consider internal and not usefull to the users.
-SymbolizedStack *SkipInternalFrames(SymbolizedStack *frames);
+const SymbolizedStack *SkipInternalFrames(const SymbolizedStack *frames);
 
 void ReportMmapWriteExec(int prot, int mflags);
 

compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_report.cpp

@@ -41,8 +41,8 @@ static bool FrameIsInternal(const SymbolizedStack *frame) {
   return false;
 }
 
-SymbolizedStack *SkipInternalFrames(SymbolizedStack *frames) {
-  for (SymbolizedStack *f = frames; f; f = f->next)
+const SymbolizedStack *SkipInternalFrames(const SymbolizedStack *frames) {
+  for (const SymbolizedStack *f = frames; f; f = f->next)
     if (!FrameIsInternal(f))
       return f;
   return nullptr;

compiler-rt/lib/tsan/rtl/tsan_report.cpp

@@ -273,8 +273,8 @@ static ReportStack *ChooseSummaryStack(const ReportDesc *rep) {
   return 0;
 }
 
-static SymbolizedStack *SkipTsanInternalFrames(SymbolizedStack *frames) {
-  if (SymbolizedStack *f = SkipInternalFrames(frames))
+static const SymbolizedStack *SkipTsanInternalFrames(SymbolizedStack *frames) {
+  if (const SymbolizedStack *f = SkipInternalFrames(frames))
     return f;
   return frames;  // Fallback to the top frame.
 }
@@ -350,7 +350,7 @@ void PrintReport(const ReportDesc *rep) {
     Printf("  And %d more similar thread leaks.\n\n", rep->count - 1);
 
   if (ReportStack *stack = ChooseSummaryStack(rep)) {
-    if (SymbolizedStack *frame = SkipTsanInternalFrames(stack->frames))
+    if (const SymbolizedStack *frame = SkipTsanInternalFrames(stack->frames))
       ReportErrorSummary(rep_typ_str, frame->info);
   }