[stubs] Introduce a proper ToBooleanStub.

test/unittests/runtime/runtime-interpreter-unittest.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/factory.h"
-#include "src/heap/heap.h"
-#include "src/heap/heap-inl.h"
-#include "src/runtime/runtime.h"
-#include "test/unittests/test-utils.h"
-
-namespace v8 {
-namespace internal {
-namespace interpreter {
-
-class RuntimeInterpreterTest : public TestWithIsolateAndZone {
- public:
-  typedef Object* (*RuntimeMethod)(int, Object**, Isolate*);
-
-  RuntimeInterpreterTest() {}
-  ~RuntimeInterpreterTest() override {}
-
-  bool TestOperatorWithObjects(RuntimeMethod method, Handle<Object> lhs,
-                               Handle<Object> rhs, bool expected);
-};
-
-
-bool RuntimeInterpreterTest::TestOperatorWithObjects(RuntimeMethod method,
-                                                     Handle<Object> lhs,
-                                                     Handle<Object> rhs,
-                                                     bool expected) {
-  Object* args_object[] = {*rhs, *lhs};
-  Handle<Object> result =
-      handle(method(2, &args_object[1], isolate()), isolate());
-  CHECK(result->IsTrue() || result->IsFalse());
-  return result->IsTrue() == expected;
-}
-
-
-TEST_F(RuntimeInterpreterTest, ToBoolean) {
-  double quiet_nan = std::numeric_limits<double>::quiet_NaN();
-  std::pair<Handle<Object>, bool> cases[] = {
-      std::make_pair(isolate()->factory()->NewNumberFromInt(0), false),
-      std::make_pair(isolate()->factory()->NewNumberFromInt(1), true),
-      std::make_pair(isolate()->factory()->NewNumberFromInt(100), true),
-      std::make_pair(isolate()->factory()->NewNumberFromInt(-1), true),
-      std::make_pair(isolate()->factory()->NewNumber(7.7), true),
-      std::make_pair(isolate()->factory()->NewNumber(0.00001), true),
-      std::make_pair(isolate()->factory()->NewNumber(quiet_nan), false),
-      std::make_pair(isolate()->factory()->NewHeapNumber(0.0), false),
-      std::make_pair(isolate()->factory()->undefined_value(), false),
-      std::make_pair(isolate()->factory()->null_value(), false),
-      std::make_pair(isolate()->factory()->true_value(), true),
-      std::make_pair(isolate()->factory()->false_value(), false),
-      std::make_pair(isolate()->factory()->NewStringFromStaticChars(""), false),
-      std::make_pair(isolate()->factory()->NewStringFromStaticChars("_"), true),
-  };
-
-  for (size_t i = 0; i < arraysize(cases); i++) {
-    auto& value_expected_tuple = cases[i];
-    Object* args_object[] = {*value_expected_tuple.first};
-    Handle<Object> result = handle(
-        Runtime_InterpreterToBoolean(1, &args_object[0], isolate()), isolate());
-    CHECK(result->IsBoolean());
-    CHECK_EQ(result->IsTrue(), value_expected_tuple.second);
-  }
-}
-
-
-}  // namespace interpreter
-}  // namespace internal
-}  // namespace v8