Add --parse-all option in order to benchmark and measure the scanner/parser performance.

runtime/bin/main.cc

Index: runtime/bin/main.cc
diff --git a/runtime/bin/main.cc b/runtime/bin/main.cc
index 9f7123843e824452a4c3793fac63b43d830f3b50..8e4082f837689d914e1aaced33982a85be582ddb 100644
--- a/runtime/bin/main.cc
+++ b/runtime/bin/main.cc
@@ -78,6 +78,7 @@ static const char* commandline_packages_file = NULL;
 // Global flag that is used to indicate that we want to compile all the
 // dart functions and not run anything.
 static bool compile_all = false;
+static bool parse_all = false;
 
 
 // Global flag that is used to indicate that we want to use blobs/mmap instead
@@ -324,6 +325,17 @@ static bool ProcessCompileAllOption(const char* arg,
 }
 
 
+static bool ProcessParseAllOption(const char* arg,
+                                  CommandLineOptions* vm_options) {
+  ASSERT(arg != NULL);
+  if (*arg != '\0') {
+    return false;
+  }
+  parse_all = true;
+  return true;
+}
+
+
 static bool ProcessUseBlobsOption(const char* arg,
                                   CommandLineOptions* vm_options) {
   ASSERT(arg != NULL);
@@ -510,6 +522,7 @@ static struct {
 
   // VM specific options to the standalone dart program.
   { "--compile_all", ProcessCompileAllOption },
+  { "--parse_all", ProcessParseAllOption },
   { "--enable-vm-service", ProcessEnableVmServiceOption },
   { "--disable-service-origin-check", ProcessDisableServiceOriginCheckOption },
   { "--observe", ProcessObserveOption },
@@ -795,10 +808,12 @@ static Dart_Isolate CreateIsolateAndSetupHelper(const char* script_uri,
       *error = strdup(VmService::GetErrorMessage());
       return NULL;
     }
+#if 0

[hausner, 2016/09/09 16:31:07]

Maybe remove this entirely in a separate change?

[siva, 2016/09/23 00:04:03]

Removed the #if 0 ... #endif as I added a --parse-all option and let the
compile-all option remain the way it was.

     if (compile_all) {
       result = Dart_CompileAll();
       CHECK_RESULT(result);
     }
+#endif
     Dart_ExitScope();
     Dart_ExitIsolate();
     return isolate;
@@ -1463,6 +1478,19 @@ bool RunMainIsolate(const char* script_name,
     if (compile_all) {
       result = Dart_CompileAll();
       CHECK_RESULT(result);
+      Dart_ExitScope();

[hausner, 2016/09/09 17:30:51]

This will actually break tests that execute the code after compiling everything.
I think it's useful to be able to run a program and ask that all code be
compiled.

[siva, 2016/09/23 00:04:03]

Removed this as compile_all is unchanged.

+      // Shutdown the isolate.
+      Dart_ShutdownIsolate();
+      return false;
+    }
+
+    if (parse_all) {
+      result = Dart_ParseAll();
+      CHECK_RESULT(result);
+      Dart_ExitScope();
+      // Shutdown the isolate.
+      Dart_ShutdownIsolate();
+      return false;
     }
 
     if (is_noopt || (gen_snapshot_kind == kAppAOT)) {