[Interpreter] Adds support for DeleteLookupSlot to Interpreter.

test/cctest/compiler/test-run-bytecode-graph-builder.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 <utility>
 
 #include "src/compiler/pipeline.h"
 #include "src/execution.h"
 #include "src/handles.h"
 #include "src/interpreter/bytecode-array-builder.h"
@@ skipping 960 matching lines @@
     SNPrintF(script, "%s %s({});", snippets[i].code_snippet, kFunctionName);
 
     BytecodeGraphTester tester(isolate, zone, script.start());
     auto callable = tester.GetCallable<>();
     Handle<Object> return_value = callable().ToHandleChecked();
     CHECK(return_value->SameValue(*snippets[i].return_value()));
   }
 }
 
 
+TEST(BytecodeGraphBuilderDeleteLookupSlot) {
+  HandleAndZoneScope scope;
+  Isolate* isolate = scope.main_isolate();
+  Zone* zone = scope.main_zone();
+  Factory* factory = isolate->factory();
+
+  // TODO(mythria): Add more tests when we have support for LdaLookupSlot.
+  const char* function_prologue = "var f;"
+                                  "var x = 1;"
+                                  "y = 10;"
+                                  "var obj = {val:10};"
+                                  "var z = 30;"
+                                  "function f1() {"
+                                  "  var z = 20;"
+                                  "  eval(\"function t() {";
+  const char* function_epilogue = "        }; f = t; t();\");"
+                                  "}"
+                                  "f1();";
+
+  ExpectedSnippet<0> snippets[] = {
+      {"return delete y;", {factory->true_value()}},
+      {"return delete z;", {factory->false_value()}},
+  };
+
+  size_t num_snippets = sizeof(snippets) / sizeof(snippets[0]);
+  for (size_t i = 0; i < num_snippets; i++) {
+    ScopedVector<char> script(1024);
+    SNPrintF(script, "%s %s %s", function_prologue, snippets[i].code_snippet,
+             function_epilogue);
+
+    BytecodeGraphTester tester(isolate, zone, script.start(), "t");
+    auto callable = tester.GetCallable<>();
+    Handle<Object> return_value = callable().ToHandleChecked();
+    CHECK(return_value->SameValue(*snippets[i].return_value()));
+  }
+}
+
+
 bool get_compare_result(Token::Value opcode, Handle<Object> lhs_value,
                         Handle<Object> rhs_value) {
   switch (opcode) {
     case Token::Value::EQ:
       return Object::Equals(lhs_value, rhs_value).FromJust();
     case Token::Value::NE:
       return !Object::Equals(lhs_value, rhs_value).FromJust();
     case Token::Value::EQ_STRICT:
       return lhs_value->StrictEquals(*rhs_value);
     case Token::Value::NE_STRICT:
@@ skipping 885 matching lines @@
     BytecodeGraphTester tester(isolate, zone, script.start());
     auto callable = tester.GetCallable<>();
     Handle<Object> return_value = callable().ToHandleChecked();
     CHECK(return_value->SameValue(*snippets[i].return_value()));
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8