1/*
2 * Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
3 * Copyright (C) 2003, 2008, 2016 Apple Inc. All rights reserved.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 */
20
21#include "config.h"
22#include "ErrorPrototype.h"
23
24#include "Error.h"
25#include "JSFunction.h"
26#include "JSStringInlines.h"
27#include "ObjectPrototype.h"
28#include "JSCInlines.h"
29#include "StringRecursionChecker.h"
30
31namespace JSC {
32
33STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(ErrorPrototype);
34
35static EncodedJSValue JSC_HOST_CALL errorProtoFuncToString(ExecState*);
36
37}
38
39#include "ErrorPrototype.lut.h"
40
41namespace JSC {
42
43const ClassInfo ErrorPrototype::s_info = { "Object", &Base::s_info, &errorPrototypeTable, nullptr, CREATE_METHOD_TABLE(ErrorPrototype) };
44
45/* Source for ErrorPrototype.lut.h
46@begin errorPrototypeTable
47 toString errorProtoFuncToString DontEnum|Function 0
48@end
49*/
50
51ErrorPrototype::ErrorPrototype(VM& vm, Structure* structure)
52 : JSNonFinalObject(vm, structure)
53{
54}
55
56ErrorPrototype* ErrorPrototype::create(VM& vm, JSGlobalObject*, Structure* structure)
57{
58 ErrorPrototype* prototype = new (NotNull, allocateCell<ErrorPrototype>(vm.heap)) ErrorPrototype(vm, structure);
59 prototype->finishCreation(vm, "Error"_s);
60 return prototype;
61}
62
63void ErrorPrototype::finishCreation(VM& vm, const String& name)
64{
65 Base::finishCreation(vm);
66 ASSERT(inherits(vm, info()));
67 putDirectWithoutTransition(vm, vm.propertyNames->name, jsString(&vm, name), static_cast<unsigned>(PropertyAttribute::DontEnum));
68 putDirectWithoutTransition(vm, vm.propertyNames->message, jsEmptyString(&vm), static_cast<unsigned>(PropertyAttribute::DontEnum));
69}
70
71// ------------------------------ Functions ---------------------------
72
73// ECMA-262 5.1, 15.11.4.4
74EncodedJSValue JSC_HOST_CALL errorProtoFuncToString(ExecState* exec)
75{
76 VM& vm = exec->vm();
77 auto scope = DECLARE_THROW_SCOPE(vm);
78
79 // 1. Let O be the this value.
80 JSValue thisValue = exec->thisValue();
81
82 // 2. If Type(O) is not Object, throw a TypeError exception.
83 if (!thisValue.isObject())
84 return throwVMTypeError(exec, scope);
85 JSObject* thisObj = asObject(thisValue);
86
87 // Guard against recursion!
88 StringRecursionChecker checker(exec, thisObj);
89 EXCEPTION_ASSERT(!scope.exception() || checker.earlyReturnValue());
90 if (JSValue earlyReturnValue = checker.earlyReturnValue())
91 return JSValue::encode(earlyReturnValue);
92
93 // 3. Let name be the result of calling the [[Get]] internal method of O with argument "name".
94 JSValue name = thisObj->get(exec, vm.propertyNames->name);
95 RETURN_IF_EXCEPTION(scope, encodedJSValue());
96
97 // 4. If name is undefined, then let name be "Error"; else let name be ToString(name).
98 String nameString;
99 if (name.isUndefined())
100 nameString = "Error"_s;
101 else {
102 nameString = name.toWTFString(exec);
103 RETURN_IF_EXCEPTION(scope, encodedJSValue());
104 }
105
106 // 5. Let msg be the result of calling the [[Get]] internal method of O with argument "message".
107 JSValue message = thisObj->get(exec, vm.propertyNames->message);
108 RETURN_IF_EXCEPTION(scope, encodedJSValue());
109
110 // (sic)
111 // 6. If msg is undefined, then let msg be the empty String; else let msg be ToString(msg).
112 // 7. If msg is undefined, then let msg be the empty String; else let msg be ToString(msg).
113 String messageString;
114 if (message.isUndefined())
115 messageString = String();
116 else {
117 messageString = message.toWTFString(exec);
118 RETURN_IF_EXCEPTION(scope, encodedJSValue());
119 }
120
121 // 8. If name is the empty String, return msg.
122 if (!nameString.length())
123 return JSValue::encode(message.isString() ? message : jsString(exec, messageString));
124
125 // 9. If msg is the empty String, return name.
126 if (!messageString.length())
127 return JSValue::encode(name.isString() ? name : jsString(exec, nameString));
128
129 // 10. Return the result of concatenating name, ":", a single space character, and msg.
130 RELEASE_AND_RETURN(scope, JSValue::encode(jsMakeNontrivialString(exec, nameString, ": ", messageString)));
131}
132
133} // namespace JSC
134