Revert "Add support for custom loaders to the sanitizer symbolizer"

This reverts commit r314671, which hangs on the gcc sanitizer buildbot.

llvm-svn: 314684

compiler-rt/lib/sanitizer_common/sanitizer_common.h

@@ -730,7 +730,6 @@ class ListOfModules {
   ListOfModules() : initialized(false) {}
   ~ListOfModules() { clear(); }
   void init();
-  void fallbackInit();  // Uses fallback init if available, otherwise clears
   const LoadedModule *begin() const { return modules_.begin(); }
   LoadedModule *begin() { return modules_.begin(); }
   const LoadedModule *end() const { return modules_.end(); }

compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cc

@@ -488,17 +488,6 @@ void ListOfModules::init() {
   }
 }
 
-// When a custom loader is used, dl_iterate_phdr may not contain the full
-// list of modules. Allow callers to fall back to using procmaps.
-void ListOfModules::fallbackInit() {
-  if (!requiresProcmaps()) {
-    clearOrInit();
-    procmapsInit(&modules_);
-  } else {
-    clear();
-  }
-}
-
 // getrusage does not give us the current RSS, only the max RSS.
 // Still, this is better than nothing if /proc/self/statm is not available
 // for some reason, e.g. due to a sandbox.

compiler-rt/lib/sanitizer_common/sanitizer_mac.cc

@@ -416,8 +416,6 @@ void ListOfModules::init() {
   memory_mapping.DumpListOfModules(&modules_);
 }
 
-void ListOfModules::fallbackInit() { clear(); }
-
 static HandleSignalMode GetHandleSignalModeImpl(int signum) {
   switch (signum) {
     case SIGABRT:

compiler-rt/lib/sanitizer_common/sanitizer_symbolizer.h

@@ -152,7 +152,6 @@ class Symbolizer final {
                                          uptr *module_offset,
                                          ModuleArch *module_arch);
   ListOfModules modules_;
-  ListOfModules fallback_modules_;
   // If stale, need to reload the modules before looking up addresses.
   bool modules_fresh_;
 

compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_libcdep.cc

@@ -165,7 +165,6 @@ bool Symbolizer::FindModuleNameAndOffsetForAddress(uptr address,
 
 void Symbolizer::RefreshModules() {
   modules_.init();
-  fallback_modules_.fallbackInit();
   RAW_CHECK(modules_.size() > 0);
   modules_fresh_ = true;
 }
@@ -199,10 +198,6 @@ const LoadedModule *Symbolizer::FindModuleForAddress(uptr address) {
     if (module) return module;
   }
 #endif
-
-  if (fallback_modules_.size()) {
-    module = SearchForModule(fallback_modules_, address);
-  }
   return module;
 }
 

compiler-rt/lib/sanitizer_common/sanitizer_win.cc

@@ -583,9 +583,7 @@ void ListOfModules::init() {
     modules_.push_back(cur_module);
   }
   UnmapOrDie(hmodules, modules_buffer_size);
-}
-
-void ListOfModules::fallbackInit() { clear(); }
+};
 
 // We can't use atexit() directly at __asan_init time as the CRT is not fully
 // initialized at this point.  Place the functions into a vector and use