Add the ability to defer the initialization of the SyzyAsan crash reporter.

syzygy/agent/asan/runtime.cc

Index: syzygy/agent/asan/runtime.cc
diff --git a/syzygy/agent/asan/runtime.cc b/syzygy/agent/asan/runtime.cc
index a35ea5c7772302e01c0290df649a511f1d89b449..0cee22141cdeb432e5d0802099d2edc785ff313b 100644
--- a/syzygy/agent/asan/runtime.cc
+++ b/syzygy/agent/asan/runtime.cc
@@ -501,13 +501,6 @@ bool AsanRuntime::SetUp(const std::wstring& flags_command_line) {
     return false;
   WindowsHeapAdapter::SetUp(heap_manager_.get());
 
-  // Determine the preferred crash reporter type, as specified in the
-  // environment. If this isn't present it defaults to
-  // kDefaultCrashReporterType, in which case experiments or command-line flags
-  // may specify the crash reporter to use.
-  CrashReporterType crash_reporter_type =
-      GetCrashReporterTypeFromEnvironment(logger());
-
   if (params_.feature_randomization) {
     AsanFeatureSet feature_set = GenerateRandomFeatureSet();
     PropagateFeatureSet(feature_set);
@@ -516,27 +509,7 @@ bool AsanRuntime::SetUp(const std::wstring& flags_command_line) {
   // Propagates the flags values to the different modules.
   PropagateParams();
 
-  // The name 'disable_breakpad_reporting' is legacy; this actually means to
-  // disable all external crash reporting integration.
-  if (!params_.disable_breakpad_reporting) {
-    // This will create the crash reporter with a preference for creating a
-    // reporter of the hinted type. If such a reporter isn't available, it will
-    // fall back to trying to create the most 'modern' reporter available.
-    crash_reporter_.reset(CreateCrashReporterWithTypeHint(
-        logger(), crash_reporter_type).release());
-  }
-
-  // Set up the appropriate error handler depending on whether or not
-  // we successfully initialized a crash reporter.
-  if (crash_reporter_.get() != nullptr) {
-    logger_->Write(base::StringPrintf(
-        "SyzyASAN: Using %s for error reporting.",
-        crash_reporter_->GetName()));
-    SetErrorCallBack(base::Bind(&CrashReporterErrorHandler));
-  } else {
-    logger_->Write("SyzyASAN: Using default error reporting handler.");
-    SetErrorCallBack(base::Bind(&DefaultErrorHandler));
-  }
+  InitializeCrashReporter();
 
   // Install the unhandled exception handler. This is only installed once
   // across all runtime instances in a process so we check that it hasn't
@@ -1227,5 +1200,42 @@ AsanFeatureSet AsanRuntime::GetEnabledFeatureSet() {
   return enabled_features;
 }
 
+void AsanRuntime::InitializeCrashReporter() {
+  if (crash_reporter_.get() != nullptr) {
+    logger_->Write(base::StringPrintf(
+        "SyzyASAN: Reinitializing crash reporter.",
+        crash_reporter_->GetName()));
+  }
+
+  // Determine the preferred crash reporter type, as specified in the
+  // environment. If this isn't present it defaults to
+  // kDefaultCrashReporterType, in which case experiments or command-line flags
+  // may specify the crash reporter to use.
+  CrashReporterType crash_reporter_type =
+      GetCrashReporterTypeFromEnvironment(logger());
+
+  // The name 'disable_breakpad_reporting' is legacy; this actually means to
+  // disable all external crash reporting integration.
+  if (!params_.disable_breakpad_reporting) {
+    // This will create the crash reporter with a preference for creating a
+    // reporter of the hinted type. If such a reporter isn't available, it will
+    // fall back to trying to create the most 'modern' reporter available.
+    crash_reporter_.reset(CreateCrashReporterWithTypeHint(
+        logger(), crash_reporter_type).release());
+  }
+
+  // Set up the appropriate error handler depending on whether or not
+  // we successfully initialized a crash reporter.
+  if (crash_reporter_.get() != nullptr) {
+    logger_->Write(base::StringPrintf(
+        "SyzyASAN: Using %s for error reporting.",
+        crash_reporter_->GetName()));
+    SetErrorCallBack(base::Bind(&CrashReporterErrorHandler));
+  } else {
+    logger_->Write("SyzyASAN: Using default error reporting handler.");
+    SetErrorCallBack(base::Bind(&DefaultErrorHandler));
+  }
+}
+
 }  // namespace asan
 }  // namespace agent