Add simple VM test for precompiled code.

tests/standalone/precompilation_test.dart

Index: tests/standalone/precompilation_test.dart
diff --git a/tests/standalone/precompilation_test.dart b/tests/standalone/precompilation_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..4e8d491d6767516f0347d1be149debae271eed02
--- /dev/null
+++ b/tests/standalone/precompilation_test.dart
@@ -0,0 +1,81 @@
+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// Test generating and running a simple precompiled snapshot of this script.
+
+import 'dart:io';
+
+main(List args) {
+  if (!Platform.isLinux) {
+    print("Linux only test");
+    return;
+  }
+  if (args.length > 0 && args[0] == "--hello") {
+    print("Hello");
+    return;
+  }
+  var dart_executable =
+      Directory.current.path + Platform.pathSeparator + Platform.executable;
+  Directory tmp;
+  try {
+    tmp = Directory.current.createTempSync("temp_precompilation_test");
+    var result = Process.runSync(
+       "${dart_executable}_no_snapshot",
+       ["--gen-precompiled-snapshot", Platform.script.path],
+       workingDirectory: tmp.path);
+    if (result.exitCode != 0) {
+      print(result.stdout);
+      print(result.stderr);
+      throw "Snapshot generation failed.";
+    }
+
+    // Check if gcc is present, and skip test if it is not.
+    try {
+      result = Process.runSync(
+          "gcc",
+          ["--version"],
+          workingDirectory: tmp.path);
+      if (result.exitCode != 0) {
+        throw "gcc --version failed.";
+      }
+    } catch(e) {
+      print("Skipping test because gcc is not present: $e");
+      return;
+    }
+
+    // Detect if we're running a 32- or 64-bit VM.
+    result = Process.runSync( "file", [dart_executable]);
+    if (result.exitCode != 0) {
+      print(result.stdout);
+      print(result.stderr);
+      throw "'file $dart_executable' failed.";
+    }
+    var m_option = result.stdout.contains("32-bit") ? "-m32" : "-m64";
+
+    result = Process.runSync(
+        "gcc",
+        ["-shared", m_option, "-o", "libprecompiled.so", "precompiled.S"],
+        workingDirectory: tmp.path);
+    if (result.exitCode != 0) {
+      print(result.stdout);
+      print(result.stderr);
+      throw "Shared library creation failed!";
+    }
+    result = Process.runSync(
+       "${dart_executable}",
+       ["--run-precompiled-snapshot", "ignored_script", "--hello"],
+       workingDirectory: tmp.path);
+    if (result.exitCode != 0) {
+      print(result.stdout);
+      print(result.stderr);
+      throw "Precompiled binary failed.";
+    }
+    print(result.stdout);
+    if (result.stdout != "Hello\n") {
+      throw "Precompiled binary output mismatch.";
+    }
+  } finally {
+    tmp?.deleteSync(recursive: true);
+  }
+}