Line data    Source code

       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/heap/heap-inl.h"  // For public_symbol_table().
       9             : #include "src/objects-inl.h"
      10             : 
      11             : namespace v8 {
      12             : namespace internal {
      13             : 
      14             : // -----------------------------------------------------------------------------
      15             : // ES #sec-symbol-objects
      16             : 
      17             : // ES #sec-symbol-constructor
      18       53940 : BUILTIN(SymbolConstructor) {
      19             :   HandleScope scope(isolate);
      20       10788 :   if (!args.new_target()->IsUndefined(isolate)) {  // [[Construct]]
      21         288 :     THROW_NEW_ERROR_RETURN_FAILURE(
      22             :         isolate, NewTypeError(MessageTemplate::kNotConstructor,
      23             :                               isolate->factory()->Symbol_string()));
      24             :   }
      25             :   // [[Call]]
      26       10644 :   Handle<Symbol> result = isolate->factory()->NewSymbol();
      27             :   Handle<Object> description = args.atOrUndefined(isolate, 1);
      28       10644 :   if (!description->IsUndefined(isolate)) {
      29        4031 :     ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, description,
      30             :                                        Object::ToString(isolate, description));
      31        2002 :     result->set_name(*description);
      32             :   }
      33       10635 :   return *result;
      34             : }
      35             : 
      36             : // ES6 section 19.4.2.1 Symbol.for.
      37         528 : BUILTIN(SymbolFor) {
      38             :   HandleScope scope(isolate);
      39         132 :   Handle<Object> key_obj = args.atOrUndefined(isolate, 1);
      40             :   Handle<String> key;
      41         264 :   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, key,
      42             :                                      Object::ToString(isolate, key_obj));
      43         264 :   return *isolate->SymbolFor(RootIndex::kPublicSymbolTable, key, false);
      44             : }
      45             : 
      46             : // ES6 section 19.4.2.5 Symbol.keyFor.
      47         495 : BUILTIN(SymbolKeyFor) {
      48             :   HandleScope scope(isolate);
      49             :   Handle<Object> obj = args.atOrUndefined(isolate, 1);
      50          99 :   if (!obj->IsSymbol()) {
      51          36 :     THROW_NEW_ERROR_RETURN_FAILURE(
      52             :         isolate, NewTypeError(MessageTemplate::kSymbolKeyFor, obj));
      53             :   }
      54             :   Handle<Symbol> symbol = Handle<Symbol>::cast(obj);
      55             :   DisallowHeapAllocation no_gc;
      56             :   Object result;
      57          81 :   if (symbol->is_public()) {
      58             :     result = symbol->name();
      59             :     DCHECK(result->IsString());
      60             :   } else {
      61             :     result = ReadOnlyRoots(isolate).undefined_value();
      62             :   }
      63             :   DCHECK_EQ(isolate->heap()->public_symbol_table()->SlowReverseLookup(*symbol),
      64             :             result);
      65          81 :   return result;
      66             : }
      67             : 
      68             : }  // namespace internal
      69      122036 : }  // namespace v8