[Sanitizer] Simplify Symbolizer creation interface.

Get rid of Symbolizer::Init(path_to_external) in favor of
thread-safe Symbolizer::GetOrInit(), and use the latter version
everywhere. Implicitly depend on the value of external_symbolizer_path
runtime flag instead of passing it around manually.

No functionality change.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@214005 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 11 insertions, 29 deletions

diff --git a/lib/sanitizer_common/sanitizer_symbolizer.h b/lib/sanitizer_common/sanitizer_symbolizer.h
index 7057a89e2..801afbf9c 100644
--- a/lib/sanitizer_common/sanitizer_symbolizer.h
+++ b/lib/sanitizer_common/sanitizer_symbolizer.h
@@ -78,14 +78,9 @@ class Symbolizer {
   /// Returns platform-specific implementation of Symbolizer, or null if not
   /// initialized.
   static Symbolizer *GetOrNull();
-  /// Returns platform-specific implementation of Symbolizer.  Will
-  /// automatically initialize symbolizer as if by calling Init(0) if needed.
+  /// Initialize and return platform-specific implementation of symbolizer
+  /// (if it wasn't already initialized).
   static Symbolizer *GetOrInit();
-  /// Initialize and return the symbolizer, given an optional path to an
-  /// external symbolizer.  The path argument is only required for legacy
-  /// reasons as this function will check $PATH for an external symbolizer.  Not
-  /// thread safe.
-  static Symbolizer *Init(const char* path_to_external = 0);
   // Fills at most "max_frames" elements of "frames" with descriptions
   // for a given address (in all inlined functions). Returns the number
   // of descriptions actually filled.
@@ -122,10 +117,7 @@ class Symbolizer {
 
  private:
   /// Platform-specific function for creating a Symbolizer object.
-  static Symbolizer *PlatformInit(const char *path_to_external);
-  /// Create a symbolizer and store it to symbolizer_ without checking if one
-  /// already exists.  Not thread safe.
-  static Symbolizer *CreateAndStore(const char *path_to_external);
+  static Symbolizer *PlatformInit();
   /// Initialize the symbolizer in a disabled state.  Not thread safe.
   static Symbolizer *Disable();
 
diff --git a/lib/sanitizer_common/sanitizer_symbolizer_libcdep.cc b/lib/sanitizer_common/sanitizer_symbolizer_libcdep.cc
index b431e51e2..7ac7da7b2 100644
--- a/lib/sanitizer_common/sanitizer_symbolizer_libcdep.cc
+++ b/lib/sanitizer_common/sanitizer_symbolizer_libcdep.cc
@@ -16,24 +16,13 @@
 
 namespace __sanitizer {
 
-Symbolizer *Symbolizer::CreateAndStore(const char *path_to_external) {
-  Symbolizer *platform_symbolizer = PlatformInit(path_to_external);
-  if (!platform_symbolizer)
-    return Disable();
-  symbolizer_ = platform_symbolizer;
-  return platform_symbolizer;
-}
-
-Symbolizer *Symbolizer::Init(const char *path_to_external) {
-  CHECK_EQ(0, symbolizer_);
-  return CreateAndStore(path_to_external);
-}
-
 Symbolizer *Symbolizer::GetOrInit() {
   SpinMutexLock l(&init_mu_);
-  if (symbolizer_ == 0)
-    return CreateAndStore(0);
-  return symbolizer_;
+  if (symbolizer_)
+    return symbolizer_;
+  if (symbolizer_ = PlatformInit())
+    return symbolizer_;
+  return Disable();
 }
 
 }  // namespace __sanitizer
diff --git a/lib/sanitizer_common/sanitizer_symbolizer_posix_libcdep.cc b/lib/sanitizer_common/sanitizer_symbolizer_posix_libcdep.cc
index ddb9e1734..ec687b04f 100644
--- a/lib/sanitizer_common/sanitizer_symbolizer_posix_libcdep.cc
+++ b/lib/sanitizer_common/sanitizer_symbolizer_posix_libcdep.cc
@@ -716,7 +716,7 @@ class POSIXSymbolizer : public Symbolizer {
   LibbacktraceSymbolizer *libbacktrace_symbolizer_;   // Leaked.
 };
 
-Symbolizer *Symbolizer::PlatformInit(const char *path_to_external) {
+Symbolizer *Symbolizer::PlatformInit() {
   if (!common_flags()->symbolize) {
     return new(symbolizer_allocator_) POSIXSymbolizer(0, 0, 0);
   }
@@ -729,6 +729,7 @@ Symbolizer *Symbolizer::PlatformInit(const char *path_to_external) {
     libbacktrace_symbolizer =
         LibbacktraceSymbolizer::get(&symbolizer_allocator_);
     if (!libbacktrace_symbolizer) {
+      const char *path_to_external = common_flags()->external_symbolizer_path;
       if (path_to_external && path_to_external[0] == '\0') {
         // External symbolizer is explicitly disabled. Do nothing.
       } else {
diff --git a/lib/sanitizer_common/sanitizer_symbolizer_win.cc b/lib/sanitizer_common/sanitizer_symbolizer_win.cc
index a7acdb69b..4f203a437 100644
--- a/lib/sanitizer_common/sanitizer_symbolizer_win.cc
+++ b/lib/sanitizer_common/sanitizer_symbolizer_win.cc
@@ -110,7 +110,7 @@ class WinSymbolizer : public Symbolizer {
   bool initialized_;
 };
 
-Symbolizer *Symbolizer::PlatformInit(const char *path_to_external) {
+Symbolizer *Symbolizer::PlatformInit() {
   static bool called_once = false;
   CHECK(!called_once && "Shouldn't create more than one symbolizer");
   called_once = true;