[Interpreter] Add support for for..in.

test/cctest/interpreter/test-interpreter.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/execution.h"
 #include "src/handles.h"
 #include "src/interpreter/bytecode-array-builder.h"
 #include "src/interpreter/interpreter.h"
@@ skipping 2246 matching lines @@
     };
 
     InterpreterTester tester(handles.main_isolate(), create_args[i].first);
     auto callable =
         tester.GetCallable<Handle<Object>, Handle<Object>, Handle<Object>>();
     Handle<Object> return_val =
         callable(args[0], args[1], args[2]).ToHandleChecked();
     CHECK(return_val->SameValue(*args[create_args[i].second]));
   }
 }
+
+
+TEST(InterpreterForIn) {
+  HandleAndZoneScope handles;
+
+  // TODO(oth): Add a test here for delete mid-loop when delete is ready.
+  std::pair<const char*, int> for_in_samples[] = {
+      {"function f() {\n"
+       "  var r = -1;\n"
+       "  for (var a in null) { r = a; }\n"
+       "  return r;\n"
+       "}",
+       -1},
+      {"function f() {\n"
+       "  var r = -1;\n"
+       "  for (var a in undefined) { r = a; }\n"
+       "  return r;\n"
+       "}",
+       -1},
+      {"function f() {\n"
+       "  var r = 0;\n"
+       "  for (var a in [0,6,7,9]) { r = r + (1 << a); }\n"
+       "  return r;\n"
+       "}",
+       0xf},
+      {"function f() {\n"
+       "  var r = 0;\n"
+       "  for (var a in [0,6,7,9]) { r = r + (1 << a); }\n"
+       "  var r = 0;\n"
+       "  for (var a in [0,6,7,9]) { r = r + (1 << a); }\n"
+       "  return r;\n"
+       "}",
+       0xf},
+      {"function f() {\n"
+       "  var r = 0;\n"
+       "  for (var a in 'foobar') { r = r + (1 << a); }\n"
+       "  return r;\n"
+       "}",
+       0x3f},
+      {"function f() {\n"
+       "  var r = 0;\n"
+       "  for (var a in {1:0, 10:1, 100:2, 1000:3}) {\n"
+       "    r = r + Number(a);\n"
+       "   }\n"
+       "   return r;\n"
+       "}",
+       1111},
+      {"function f() {\n"
+       "  var r = 0;\n"
+       "  var input = 'foobar';\n"
+       "  for (var a in input) {\n"
+       "    if (input[a] == 'b') break;\n"
+       "    r = r + (1 << a);\n"
+       "  }\n"
+       "  return r;\n"
+       "}",
+       0x7},
+      {"function f() {\n"
+       "var r = 0;\n"
+       "var input = 'foobar';\n"
+       "for (var a in input) {\n"
+       "   if (input[a] == 'b') continue;\n"
+       "   r = r + (1 << a);\n"
+       "}\n"
+       "return r;\n"
+       "}",
+       0x37},
+      {"function f() {\n"
+       "  var r = 0;\n"
+       "  var data = {1:0, 10:1, 100:2, 1000:3};\n"
+       "  for (var a in data) {\n"
+       "    if (a == 10) {\n"
+       "       data[10000] = 4;\n"
+       "    }\n"
+       "    r = r + Number(a);\n"
+       "  }\n"
+       "  return r;\n"
+       "}",
+       1111},
+      {"function f() {\n"
+       "  var r = [ 3 ];\n"
+       "  var data = {1:0, 10:1, 100:2, 1000:3};\n"
+       "  for (r[10] in data) {\n"
+       "  }\n"
+       "  return Number(r[10]);\n"
+       "}",
+       1000},
+      {"function f() {\n"
+       "  var r = [ 3 ];\n"
+       "  var data = {1:0, 10:1, 100:2, 1000:3};\n"
+       "  for (r['100'] in data) {\n"
+       "  }\n"
+       "  return Number(r['100']);\n"
+       "}",
+       1000},
+  };
+
+  for (size_t i = 0; i < arraysize(for_in_samples); i++) {
+    InterpreterTester tester(handles.main_isolate(), for_in_samples[i].first);
+    auto callable = tester.GetCallable<>();
+    Handle<Object> return_val = callable().ToHandleChecked();
+    CHECK_EQ(Handle<Smi>::cast(return_val)->value(), for_in_samples[i].second);
+  }
+}