[Interpreter] Adds support for wide variant of load/store lookup slots.

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 3084 matching lines @@
                                   "function f1() {"
                                   "  eval(\"function t() {";
   const char* function_epilogue = "        }; f = t;\");"
                                   "}"
                                   "f1();";
 
 
   std::pair<const char*, Handle<Object>> lookup_slot[] = {
       {"return x;", handle(Smi::FromInt(1), isolate)},
       {"return typeof x;", factory->NewStringFromStaticChars("number")},
+      {"return typeof dummy;", factory->NewStringFromStaticChars("undefined")},
       {"x = 10; return x;", handle(Smi::FromInt(10), isolate)},
       {"'use strict'; x = 20; return x;", handle(Smi::FromInt(20), isolate)},
   };
 
   for (size_t i = 0; i < arraysize(lookup_slot); i++) {
     std::string script = std::string(function_prologue) +
                          std::string(lookup_slot[i].first) +
                          std::string(function_epilogue);
 
     InterpreterTester tester(handles.main_isolate(), script.c_str(), "t");
     auto callable = tester.GetCallable<>();
 
     Handle<i::Object> return_value = callable().ToHandleChecked();
     CHECK(return_value->SameValue(*lookup_slot[i].second));
   }
 }
 
 
+TEST(InterpreterLookupSlotWide) {
+  HandleAndZoneScope handles;
+  i::Isolate* isolate = handles.main_isolate();
+  i::Factory* factory = isolate->factory();
+
+  const char* function_prologue =
+      "var f;"
+      "var x = 1;"
+      "function f1() {"
+      "  eval(\"function t() {";
+  const char* function_epilogue =
+      "        }; f = t;\");"
+      "}"
+      "f1();";
+  std::ostringstream str;
+  str << "var y = 2.3;";
+  for (int i = 1; i < 256; i++) {
+    str << "y = " << 2.3 + i << ";";
+  }
+  std::string init_function_body = str.str();
+
+  std::pair<std::string, Handle<Object>> lookup_slot[] = {
+      {init_function_body + "return x;", handle(Smi::FromInt(1), isolate)},
+      {init_function_body + "return typeof x;",
+       factory->NewStringFromStaticChars("number")},
+      {init_function_body + "return x = 10;",
+       handle(Smi::FromInt(10), isolate)},
+      {"'use strict';" + init_function_body + "x = 20; return x;",
+       handle(Smi::FromInt(20), isolate)},
+  };
+
+  for (size_t i = 0; i < arraysize(lookup_slot); i++) {
+    std::string script = std::string(function_prologue) + lookup_slot[i].first +
+                         std::string(function_epilogue);
+
+    InterpreterTester tester(handles.main_isolate(), script.c_str(), "t");
+    auto callable = tester.GetCallable<>();
+
+    Handle<i::Object> return_value = callable().ToHandleChecked();
+    CHECK(return_value->SameValue(*lookup_slot[i].second));
+  }
+}
+
+
 TEST(TemporaryRegisterAllocation) {
   HandleAndZoneScope handles;
   i::Isolate* isolate = handles.main_isolate();
   i::Factory* factory = isolate->factory();
 
   std::pair<const char*, Handle<Object>> reg_tests[] = {
       {"function add(a, b, c) {"
        "   return a + b + c;"
        "}"
        "function f() {"
@@ skipping 57 matching lines @@
     auto callable = tester.GetCallable<>();
 
     Handle<i::Object> return_value = callable().ToHandleChecked();
     CHECK(return_value->SameValue(*delete_lookup_slot[i].second));
   }
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8