[ CLI ] Fix DART_VM_OPTIONS usage only resulting in printing of help message

Fixes https://github.com/dart-lang/sdk/issues/55767

TEST=pkg/dartdev/test/commands/compile_test.dart

Change-Id: I6a773acbd9fc21c086fc459c7cb983ea1ff11fcd
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/367720
Auto-Submit: Ben Konyi <bkonyi@google.com>
Reviewed-by: Derek Xu <derekx@google.com>
Commit-Queue: Derek Xu <derekx@google.com>

pkg/dartdev/test/commands/compile_test.dart

@@ -688,8 +688,10 @@ void main() {
   }, skip: isRunningOnIA32);
 
   test('Compile and run exe with DART_VM_OPTIONS', () async {
-    final p = project(mainSrc: '''void main() {
-      // Empty
+    final p = project(mainSrc: '''
+    import 'dart:math';
+    void main() {
+      print(Random().nextInt(1000));
     }''');
     final inFile = path.canonicalize(path.join(p.dirPath, p.relativeFilePath));
     final outFile = path.canonicalize(path.join(p.dirPath, 'myexe'));
@@ -710,6 +712,7 @@ void main() {
     expect(File(outFile).existsSync(), true,
         reason: 'File not found: $outFile');
 
+    // Verify CSV options are processed.
     result = Process.runSync(
       outFile,
       [],
@@ -719,8 +722,26 @@ void main() {
     );
 
     expect(result.stderr, isEmpty);
+    // vm_name is a verbose flag and will only be shown if --verbose is
+    // processed.
     expect(result.stdout, contains('vm_name'));
-    expect(result.exitCode, 255);
+    expect(result.exitCode, 0);
+
+    // Verify non-help options work.
+    //
+    // Regression test for https://github.com/dart-lang/sdk/issues/55767
+    result = Process.runSync(
+      outFile,
+      [],
+      environment: <String, String>{
+        'DART_VM_OPTIONS': '--random_seed=42',
+      },
+    );
+
+    expect(result.stderr, isEmpty);
+    // This value should be consistent as long as --random_seed is processed.
+    expect(result.stdout, contains('64'));
+    expect(result.exitCode, 0);
   }, skip: isRunningOnIA32);
 
   test('Compile exe without info', () async {

runtime/bin/main_impl.cc

@@ -1177,10 +1177,11 @@ void main(int argc, char** argv) {
 
   auto parse_arguments = [&](int argc, char** argv,
                              CommandLineOptions* vm_options,
-                             CommandLineOptions* dart_options) {
+                             CommandLineOptions* dart_options,
+                             bool parsing_dart_vm_options) {
     bool success = Options::ParseArguments(
-        argc, argv, vm_run_app_snapshot, vm_options, &script_name, dart_options,
-        &print_flags_seen, &verbose_debug_seen);
+        argc, argv, vm_run_app_snapshot, parsing_dart_vm_options, vm_options,
+        &script_name, dart_options, &print_flags_seen, &verbose_debug_seen);
     if (!success) {
       if (Options::help_option()) {
         Options::PrintUsage();
@@ -1237,7 +1238,8 @@ void main(int argc, char** argv) {
         // Any Dart options that are generated based on parsing DART_VM_OPTIONS
         // are useless, so we'll throw them away rather than passing them along.
         CommandLineOptions tmp_options(env_argc + EXTRA_VM_ARGUMENTS);
-        parse_arguments(env_argc, env_argv, &vm_options, &tmp_options);
+        parse_arguments(env_argc, env_argv, &vm_options, &tmp_options,
+                        /*parsing_dart_vm_options=*/true);
       }
     }
   }
@@ -1245,7 +1247,8 @@ void main(int argc, char** argv) {
 
   // Parse command line arguments.
   if (app_snapshot == nullptr) {
-    parse_arguments(argc, argv, &vm_options, &dart_options);
+    parse_arguments(argc, argv, &vm_options, &dart_options,
+                    /*parsing_dart_vm_options=*/false);
   }
 
   DartUtils::SetEnvironment(Options::environment());

runtime/bin/main_options.cc

@@ -502,16 +502,24 @@ bool Options::ProcessVMDebuggingOptions(const char* arg,
 bool Options::ParseArguments(int argc,
                              char** argv,
                              bool vm_run_app_snapshot,
+                             bool parsing_dart_vm_options,
                              CommandLineOptions* vm_options,
                              char** script_name,
                              CommandLineOptions* dart_options,
                              bool* print_flags_seen,
                              bool* verbose_debug_seen) {
-  // Store the executable name.
-  Platform::SetExecutableName(argv[0]);
+  int i = 0;
+#if !defined(DART_PRECOMPILED_RUNTIME)
+  // DART_VM_OPTIONS is only implemented for compiled executables.
+  ASSERT(!parsing_dart_vm_options);
+#endif  // !defined(DART_PRECOMPILED_RUNTIME)
+  if (!parsing_dart_vm_options) {
+    // Store the executable name.
+    Platform::SetExecutableName(argv[0]);
 
-  // Start the rest after the executable name.
-  int i = 1;
+    // Start the rest after the executable name.
+    i = 1;
+  }
 
   CommandLineOptions temp_vm_options(vm_options->max_count());
 
@@ -667,8 +675,10 @@ bool Options::ParseArguments(int argc,
     return false;
   }
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)
-  // Handle argument parsing errors.
-  else {  // NOLINT
+  // Handle argument parsing errors and missing script / command name when not
+  // processing options set via DART_VM_OPTIONS.
+  else if (!parsing_dart_vm_options || Options::help_option() ||  // NOLINT
+           Options::version_option()) {                           // NOLINT
     return false;
   }
   USE(enable_dartdev_analytics);
@@ -680,6 +690,15 @@ bool Options::ParseArguments(int argc,
 
   vm_options->AddArguments(vm_argv, vm_argc);
 
+#if !defined(DART_PRECOMPILED_RUNTIME)
+  // If we're parsing DART_VM_OPTIONS, there shouldn't be any script set or
+  // Dart arguments left to parse.
+  if (parsing_dart_vm_options) {
+    ASSERT(i == argc);
+    return true;
+  }
+#endif  // !defined(DART_PRECOMPILED_RUNTIME)
+
   // If running with dartdev, attempt to parse VM flags which are part of the
   // dartdev command (e.g., --enable-vm-service, --observe, etc).
   if (!run_script) {

runtime/bin/main_options.h

@@ -107,6 +107,7 @@ class Options {
   static bool ParseArguments(int argc,
                              char** argv,
                              bool vm_run_app_snapshot,
+                             bool parsing_dart_vm_options,
                              CommandLineOptions* vm_options,
                              char** script_name,
                              CommandLineOptions* dart_options,