Introduce IKG into kernel-service to support incremental compilation.

runtime/vm/isolate_reload_test.cc

Index: runtime/vm/isolate_reload_test.cc
diff --git a/runtime/vm/isolate_reload_test.cc b/runtime/vm/isolate_reload_test.cc
index ea63190baed91aeb0a2d80d9d17a12bbc1f7a7a1..cbe991bd7d588b05383db4fe4f0ec17f8c9d68a7 100644
--- a/runtime/vm/isolate_reload_test.cc
+++ b/runtime/vm/isolate_reload_test.cc
@@ -67,6 +67,217 @@ TEST_CASE(IsolateReload_FunctionReplacement) {
   EXPECT_EQ(10, SimpleInvoke(lib, "main"));
 }
 
+TEST_CASE(IsolateReload_IncrementalCompile) {
+  const char* kScriptChars =
+      "main() {\n"
+      "  return 42;\n"
+      "}\n";
+  Dart_Handle lib = TestCase::LoadTestScript(kScriptChars, NULL);
+  EXPECT_VALID(lib);
+  Dart_Handle result = Dart_Invoke(lib, NewString("main"), 0, NULL);
+  int64_t value = 0;
+  result = Dart_IntegerToInt64(result, &value);
+  EXPECT_VALID(result);
+  EXPECT_EQ(42, value);
+
+  const char* kUpdatedScriptChars =
+      "main() {\n"
+      "  return 24;\n"
+      "}\n"
+      "";
+  lib = TestCase::ReloadTestScript(kUpdatedScriptChars);
+  EXPECT_VALID(lib);
+  result = Dart_Invoke(lib, NewString("main"), 0, NULL);
+  result = Dart_IntegerToInt64(result, &value);
+  EXPECT_VALID(result);
+  EXPECT_EQ(24, value);
+}
+
+TEST_CASE(IsolateReload_KernelIncrementalCompile) {
+  // clang-format off
+  Dart_SourceFile sourcefiles[] = {
+    {
+      "file:///test-app",
+      "main() {\n"
+      "  return 42;\n"
+      "}\n",
+    },
+    {
+      "file:///.packages", "untitled:/"
+    }};
+  // clang-format on
+
+  Dart_Handle lib = TestCase::LoadTestScriptWithDFE(
+      sizeof(sourcefiles) / sizeof(Dart_SourceFile), sourcefiles,
+      NULL /* resolver */, true /* finalize */, true /* incrementally */);
+  Dart_Handle result = Dart_Invoke(lib, NewString("main"), 0, NULL);
+  int64_t value = 0;
+  result = Dart_IntegerToInt64(result, &value);
+  EXPECT_VALID(result);
+  EXPECT_EQ(42, value);
+
+  // clang-format off
+  Dart_SourceFile updated_sourcefiles[] = {
+    {
+      "file:///test-app",
+      "main() {\n"
+      "  return 24;\n"
+      "}\n"
+      ""
+    }};
+  // clang-format on
+  {
+    void* kernel_pgm = NULL;
+    char* error = TestCase::CompileTestScriptWithDFE(
+        "file:///test-app",
+        sizeof(updated_sourcefiles) / sizeof(Dart_SourceFile),
+        updated_sourcefiles, &kernel_pgm, true /* incrementally */);
+    EXPECT(error == NULL);
+    EXPECT_NOTNULL(kernel_pgm);
+
+    lib = TestCase::ReloadTestKernel(kernel_pgm);
+    EXPECT_VALID(lib);
+  }
+  result = Dart_Invoke(lib, NewString("main"), 0, NULL);
+  result = Dart_IntegerToInt64(result, &value);
+  EXPECT_VALID(result);
+  EXPECT_EQ(24, value);
+}
+
+TEST_CASE(IsolateReload_KernelIncrementalCompileAppAndLib) {
+  // clang-format off
+  Dart_SourceFile sourcefiles[] = {
+    {
+      "file:///test-app.dart",
+      "import 'test-lib.dart';\n"
+      "main() {\n"
+      "  return WhatsTheMeaningOfAllThis();\n"
+      "}\n",
+    },
+    {
+      "file:///test-lib.dart",
+      "WhatsTheMeaningOfAllThis() {\n"
+      "  return 42;\n"
+      "}\n",
+    },
+    {
+      "file:///.packages", "untitled:/"
+    }};
+  // clang-format on
+
+  Dart_Handle lib = TestCase::LoadTestScriptWithDFE(
+      sizeof(sourcefiles) / sizeof(Dart_SourceFile), sourcefiles,
+      NULL /* resolver */, true /* finalize */, true /* incrementally */);
+  EXPECT_VALID(lib);
+  Dart_Handle result = Dart_Invoke(lib, NewString("main"), 0, NULL);
+  int64_t value = 0;
+  result = Dart_IntegerToInt64(result, &value);
+  EXPECT_VALID(result);
+  EXPECT_EQ(42, value);
+
+  // clang-format off
+  Dart_SourceFile updated_sourcefiles[] = {
+    {
+      "file:///test-lib.dart",
+      "WhatsTheMeaningOfAllThis() {\n"
+      "  return 24;\n"
+      "}\n"
+      ""
+    }};
+  // clang-format on
+  {
+    void* kernel_pgm = NULL;
+    char* error = TestCase::CompileTestScriptWithDFE(
+        "file:///test-app",
+        sizeof(updated_sourcefiles) / sizeof(Dart_SourceFile),
+        updated_sourcefiles, &kernel_pgm, true /* incrementally */);
+    EXPECT(error == NULL);
+    EXPECT_NOTNULL(kernel_pgm);
+
+    lib = TestCase::ReloadTestKernel(kernel_pgm);
+    EXPECT_VALID(lib);
+  }
+  result = Dart_Invoke(lib, NewString("main"), 0, NULL);
+  result = Dart_IntegerToInt64(result, &value);
+  EXPECT_VALID(result);
+  EXPECT_EQ(24, value);
+}
+
+TEST_CASE(IsolateReload_KernelIncrementalCompileGenerics) {
+  // clang-format off
+  Dart_SourceFile sourcefiles[] = {
+    {
+      "file:///test-app.dart",
+      "import 'test-lib.dart';\n"
+      "class Account {\n"
+      "  int balance() => 42;\n"
+      "}\n"
+      "class MyAccountState extends State<Account> {\n"
+      "  MyAccountState(Account a): super(a) {}\n"
+      "}\n"
+      "main() {\n"
+      "  return (new MyAccountState(new Account()))\n"
+      "      .howAreTheThings().balance();\n"
+      "}\n",
+    },
+    {
+      "file:///test-lib.dart",
+      "class State<T> {\n"
+      "  T t;"
+      "  State(this.t);\n"
+      "  T howAreTheThings() => t;\n"
+      "}\n",
+    },
+    {
+      "file:///.packages", "untitled:/"
+    }};
+  // clang-format on
+
+  Dart_Handle lib = TestCase::LoadTestScriptWithDFE(
+      sizeof(sourcefiles) / sizeof(Dart_SourceFile), sourcefiles,
+      NULL /* resolver */, true /* finalize */, true /* incrementally */);
+  EXPECT_VALID(lib);
+  Dart_Handle result = Dart_Invoke(lib, NewString("main"), 0, NULL);
+  int64_t value = 0;
+  result = Dart_IntegerToInt64(result, &value);
+  EXPECT_VALID(result);
+  EXPECT_EQ(42, value);
+
+  // clang-format off
+  Dart_SourceFile updated_sourcefiles[] = {
+    {
+      "file:///test-app.dart",
+      "import 'test-lib.dart';\n"
+      "class Account {\n"
+      "  int balance() => 24;\n"
+      "}\n"
+      "class MyAccountState extends State<Account> {\n"
+      "  MyAccountState(Account a): super(a) {}\n"
+      "}\n"
+      "main() {\n"
+      "  return (new MyAccountState(new Account()))\n"
+      "      .howAreTheThings().balance();\n"
+      "}\n",
+    }};
+  // clang-format on
+  {
+    void* kernel_pgm = NULL;
+    char* error = TestCase::CompileTestScriptWithDFE(
+        "file:///test-app",
+        sizeof(updated_sourcefiles) / sizeof(Dart_SourceFile),
+        updated_sourcefiles, &kernel_pgm, true /* incrementally */);
+    EXPECT(error == NULL);
+    EXPECT_NOTNULL(kernel_pgm);
+
+    lib = TestCase::ReloadTestKernel(kernel_pgm);
+    EXPECT_VALID(lib);
+  }
+  result = Dart_Invoke(lib, NewString("main"), 0, NULL);
+  result = Dart_IntegerToInt64(result, &value);
+  EXPECT_VALID(result);
+  EXPECT_EQ(24, value);
+}
+
 TEST_CASE(IsolateReload_BadClass) {
   const char* kScript =
       "class Foo {\n"