tsan: symbolizer "flush caches" functinality

llvm-svn: 177388

2 files changed, 24 insertions, 0 deletions

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer.cc b/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer.cc
index 5609e91cd14..ea772b49cc1 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer.cc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer.cc
@@ -128,6 +128,9 @@ class ExternalSymbolizer {
     return StartSymbolizerSubprocess(path_, &input_fd_, &output_fd_);
   }
 
+  void Flush() {
+  }
+
  private:
   bool readFromSymbolizer(char *buffer, uptr max_length) {
     if (max_length == 0)
@@ -184,11 +187,14 @@ bool __sanitizer_symbolize_code(const char *ModuleName, u64 ModuleOffset,
 SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE
 bool __sanitizer_symbolize_data(const char *ModuleName, u64 ModuleOffset,
                                 char *Buffer, int MaxLength);
+SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE
+void __sanitizer_symbolize_flush();
 }  // extern "C"
 
 class InternalSymbolizer {
  public:
   typedef bool (*SanitizerSymbolizeFn)(const char*, u64, char*, int);
+
   static InternalSymbolizer *get() {
     if (__sanitizer_symbolize_code != 0 &&
         __sanitizer_symbolize_data != 0) {
@@ -197,6 +203,7 @@ class InternalSymbolizer {
     }
     return 0;
   }
+
   char *SendCommand(bool is_data, const char *module_name, uptr module_offset) {
     SanitizerSymbolizeFn symbolize_fn = is_data ? __sanitizer_symbolize_data
                                                 : __sanitizer_symbolize_code;
@@ -205,6 +212,11 @@ class InternalSymbolizer {
     return 0;
   }
 
+  void Flush() {
+    if (__sanitizer_symbolize_flush)
+      __sanitizer_symbolize_flush();
+  }
+
  private:
   InternalSymbolizer() { }
 
@@ -321,6 +333,13 @@ class Symbolizer {
     return internal_symbolizer_ || external_symbolizer_;
   }
 
+  void Flush() {
+    if (internal_symbolizer_)
+      internal_symbolizer_->Flush();
+    if (external_symbolizer_)
+      external_symbolizer_->Flush();
+  }
+
  private:
   char *SendCommand(bool is_data, const char *module_name, uptr module_offset) {
     // First, try to use internal symbolizer.
@@ -408,4 +427,8 @@ bool IsSymbolizerAvailable() {
   return symbolizer.IsSymbolizerAvailable();
 }
 
+void FlushSymbolizer() {
+  symbolizer.Flush();
+}
+
 }  // namespace __sanitizer
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer.h b/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer.h
index dd2037ee9fb..3aeebe9a84f 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer.h
@@ -70,6 +70,7 @@ uptr SymbolizeCode(uptr address, AddressInfo *frames, uptr max_frames);
 bool SymbolizeData(uptr address, DataInfo *info);
 
 bool IsSymbolizerAvailable();
+void FlushSymbolizer();  // releases internal caches (if any)
 
 // Attempts to demangle the provided C++ mangled name.
 const char *Demangle(const char *Name);