Implement realm object and support realms for built-ins and JS functions (#4354)

- Type for realm objects is introduced (ecma_global_object_t)
- Realm reference is added to built-in objects and ECMAScript functions
- Resolving built-ins, global environments, and scopes require realm object
- Unnecessary global object accesses are removed from the code

Missing: external functions and static snapshot functions have no realm reference

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

tests/jerry/es.next/realms1.js

@@ -0,0 +1,95 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+var realm = createRealm()
+var ev = realm.eval
+
+assert(realm.Math != Math)
+assert(typeof realm.Math === "object")
+assert(realm.Object != Object)
+assert(typeof realm.Object === "function")
+assert(realm.eval != eval)
+assert(typeof realm.eval === "function")
+
+// Share our 'assert' function with the realm
+realm.assert = assert
+
+// Test1: var1 and var2 must be different properties
+
+realm.var1 = 3.5
+assert(realm.var2 === undefined)
+
+var var1 = "X"
+var var2 = "Y"
+
+ev("assert(var1 === 3.5); \
+    try { realm; assert(false) } catch (e) { assert(e instanceof ReferenceError) } \
+    assert(this === globalThis); \
+    var var2 = this")
+assert(realm.var2 === realm)
+
+assert(var1 === "X")
+assert(var2 === "Y")
+
+// Test2: constructing any objects (including errors) must use the realm
+
+assert (realm.RangeError != RangeError)
+assert (realm.RangeError.prototype != RangeError.prototype)
+
+realm.RangeError.prototype.myProperty = "XY"
+assert(RangeError.prototype.myProperty === undefined)
+
+try {
+  var NumberToString = realm.Number.prototype.toString;
+  NumberToString.call(0, 0)
+  assert(false)
+} catch (e) {
+  assert(e instanceof realm.RangeError)
+  assert(!(e instanceof RangeError))
+  assert(e.myProperty === "XY")
+}
+
+assert (realm.SyntaxError != SyntaxError)
+assert (realm.SyntaxError.prototype != SyntaxError.prototype)
+
+realm.SyntaxError.prototype.myProperty = "AB"
+assert(SyntaxError.prototype.myProperty === undefined)
+
+try {
+  ev("5 +")
+  assert(false)
+} catch (e) {
+  assert(e instanceof realm.SyntaxError)
+  assert(!(e instanceof SyntaxError))
+  assert(e.myProperty === "AB")
+}
+
+// Test3: only the realm corresponding to the function matters
+
+realm.Boolean.prototype.valueOf.a = Function.prototype.apply
+Boolean.prototype.valueOf.a = realm.Function.prototype.apply
+
+try {
+  realm.Boolean.prototype.valueOf.a()
+} catch (e) {
+  assert(e instanceof realm.TypeError)
+  assert(!(e instanceof TypeError))
+}
+
+try {
+  Boolean.prototype.valueOf.a()
+} catch (e) {
+  assert(e instanceof TypeError)
+  assert(!(e instanceof realm.TypeError))
+}