1 // Copyright 2016 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "src/builtins/builtins-utils-inl.h"
6 #include "src/builtins/builtins.h"
7 #include "src/counters.h"
8 #include "src/objects-inl.h"
9
10 namespace v8 {
11 namespace internal {
12
13 // -----------------------------------------------------------------------------
14 // ES #sec-symbol-objects
15
16 // ES #sec-symbol-constructor
BUILTIN(SymbolConstructor)17 BUILTIN(SymbolConstructor) {
18 HandleScope scope(isolate);
19 if (!args.new_target()->IsUndefined(isolate)) { // [[Construct]]
20 THROW_NEW_ERROR_RETURN_FAILURE(
21 isolate, NewTypeError(MessageTemplate::kNotConstructor,
22 isolate->factory()->Symbol_string()));
23 }
24 // [[Call]]
25 Handle<Symbol> result = isolate->factory()->NewSymbol();
26 Handle<Object> description = args.atOrUndefined(isolate, 1);
27 if (!description->IsUndefined(isolate)) {
28 ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, description,
29 Object::ToString(isolate, description));
30 result->set_name(*description);
31 }
32 return *result;
33 }
34
35 // ES6 section 19.4.2.1 Symbol.for.
BUILTIN(SymbolFor)36 BUILTIN(SymbolFor) {
37 HandleScope scope(isolate);
38 Handle<Object> key_obj = args.atOrUndefined(isolate, 1);
39 Handle<String> key;
40 ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, key,
41 Object::ToString(isolate, key_obj));
42 return *isolate->SymbolFor(Heap::kPublicSymbolTableRootIndex, key, false);
43 }
44
45 // ES6 section 19.4.2.5 Symbol.keyFor.
BUILTIN(SymbolKeyFor)46 BUILTIN(SymbolKeyFor) {
47 HandleScope scope(isolate);
48 Handle<Object> obj = args.atOrUndefined(isolate, 1);
49 if (!obj->IsSymbol()) {
50 THROW_NEW_ERROR_RETURN_FAILURE(
51 isolate, NewTypeError(MessageTemplate::kSymbolKeyFor, obj));
52 }
53 Handle<Symbol> symbol = Handle<Symbol>::cast(obj);
54 DisallowHeapAllocation no_gc;
55 Object* result;
56 if (symbol->is_public()) {
57 result = symbol->name();
58 DCHECK(result->IsString());
59 } else {
60 result = ReadOnlyRoots(isolate).undefined_value();
61 }
62 DCHECK_EQ(isolate->heap()->public_symbol_table()->SlowReverseLookup(*symbol),
63 result);
64 return result;
65 }
66
67 } // namespace internal
68 } // namespace v8
69