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Mini Shell
Mini Shell
// Copyright 2016 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/builtins/builtins-utils-inl.h"
#include "src/builtins/builtins.h"
#include "src/heap/heap-inl.h" // For public_symbol_table().
#include "src/logging/counters.h"
#include "src/objects/objects-inl.h"
namespace v8 {
namespace internal {
// -----------------------------------------------------------------------------
// ES #sec-symbol-objects
// ES #sec-symbol-constructor
BUILTIN(SymbolConstructor) {
HandleScope scope(isolate);
if (!IsUndefined(*args.new_target(), isolate)) { // [[Construct]]
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewTypeError(MessageTemplate::kNotConstructor,
isolate->factory()->Symbol_string()));
}
// [[Call]]
Handle<Symbol> result = isolate->factory()->NewSymbol();
Handle<Object> description = args.atOrUndefined(isolate, 1);
if (!IsUndefined(*description, isolate)) {
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, description,
Object::ToString(isolate, description));
result->set_description(String::cast(*description));
}
return *result;
}
// ES6 section 19.4.2.1 Symbol.for.
BUILTIN(SymbolFor) {
HandleScope scope(isolate);
Handle<Object> key_obj = args.atOrUndefined(isolate, 1);
Handle<String> key;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, key,
Object::ToString(isolate, key_obj));
return *isolate->SymbolFor(RootIndex::kPublicSymbolTable, key, false);
}
// ES6 section 19.4.2.5 Symbol.keyFor.
BUILTIN(SymbolKeyFor) {
HandleScope scope(isolate);
Handle<Object> obj = args.atOrUndefined(isolate, 1);
if (!IsSymbol(*obj)) {
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewTypeError(MessageTemplate::kSymbolKeyFor, obj));
}
Handle<Symbol> symbol = Handle<Symbol>::cast(obj);
DisallowGarbageCollection no_gc;
Tagged<Object> result;
if (symbol->is_in_public_symbol_table()) {
result = symbol->description();
DCHECK(IsString(result));
} else {
result = ReadOnlyRoots(isolate).undefined_value();
}
DCHECK_EQ(isolate->heap()->public_symbol_table()->SlowReverseLookup(*symbol),
result);
return result;
}
} // namespace internal
} // namespace v8
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