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 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. 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. 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
