1 /* 2 * Copyright (C) 2004, 2008, 2009 Apple Inc. All rights reserved. 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Library General Public 6 * License as published by the Free Software Foundation; either 7 * version 2 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Library General Public License for more details. 13 * 14 * You should have received a copy of the GNU Library General Public License 15 * along with this library; see the file COPYING.LIB. If not, write to 16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 17 * Boston, MA 02110-1301, USA. 18 * 19 */ 20 21 22 #ifndef Protect_h 23 #define Protect_h 24 25 #include "Collector.h" 26 #include "JSValue.h" 27 28 namespace JSC { 29 30 inline void gcProtect(JSCell* val) 31 { 32 Heap::heap(val)->protect(val); 33 } 34 35 inline void gcUnprotect(JSCell* val) 36 { 37 Heap::heap(val)->unprotect(val); 38 } 39 40 inline void gcProtectNullTolerant(JSCell* val) 41 { 42 if (val) 43 gcProtect(val); 44 } 45 46 inline void gcUnprotectNullTolerant(JSCell* val) 47 { 48 if (val) 49 gcUnprotect(val); 50 } 51 52 inline void gcProtect(JSValue value) 53 { 54 if (value && value.isCell()) 55 gcProtect(asCell(value)); 56 } 57 58 inline void gcUnprotect(JSValue value) 59 { 60 if (value && value.isCell()) 61 gcUnprotect(asCell(value)); 62 } 63 64 // FIXME: Share more code with RefPtr template? The only differences are the ref/deref operation 65 // and the implicit conversion to raw pointer 66 template <class T> class ProtectedPtr { 67 public: 68 ProtectedPtr() : m_ptr(0) {} 69 ProtectedPtr(T* ptr); 70 ProtectedPtr(const ProtectedPtr&); 71 ~ProtectedPtr(); 72 73 template <class U> ProtectedPtr(const ProtectedPtr<U>&); 74 75 T* get() const { return m_ptr; } 76 operator T*() const { return m_ptr; } 77 operator JSValue() const { return JSValue(m_ptr); } 78 T* operator->() const { return m_ptr; } 79 80 operator bool() const { return m_ptr; } 81 bool operator!() const { return !m_ptr; } 82 83 ProtectedPtr& operator=(const ProtectedPtr&); 84 ProtectedPtr& operator=(T*); 85 86 private: 87 T* m_ptr; 88 }; 89 90 class ProtectedJSValue { 91 public: 92 ProtectedJSValue() {} 93 ProtectedJSValue(JSValue value); 94 ProtectedJSValue(const ProtectedJSValue&); 95 ~ProtectedJSValue(); 96 97 template <class U> ProtectedJSValue(const ProtectedPtr<U>&); 98 99 JSValue get() const { return m_value; } 100 operator JSValue() const { return m_value; } 101 JSValue operator->() const { return m_value; } 102 103 operator bool() const { return m_value; } 104 bool operator!() const { return !m_value; } 105 106 ProtectedJSValue& operator=(const ProtectedJSValue&); 107 ProtectedJSValue& operator=(JSValue); 108 109 private: 110 JSValue m_value; 111 }; 112 113 template <class T> inline ProtectedPtr<T>::ProtectedPtr(T* ptr) 114 : m_ptr(ptr) 115 { 116 gcProtectNullTolerant(m_ptr); 117 } 118 119 template <class T> inline ProtectedPtr<T>::ProtectedPtr(const ProtectedPtr& o) 120 : m_ptr(o.get()) 121 { 122 gcProtectNullTolerant(m_ptr); 123 } 124 125 template <class T> inline ProtectedPtr<T>::~ProtectedPtr() 126 { 127 gcUnprotectNullTolerant(m_ptr); 128 } 129 130 template <class T> template <class U> inline ProtectedPtr<T>::ProtectedPtr(const ProtectedPtr<U>& o) 131 : m_ptr(o.get()) 132 { 133 gcProtectNullTolerant(m_ptr); 134 } 135 136 template <class T> inline ProtectedPtr<T>& ProtectedPtr<T>::operator=(const ProtectedPtr<T>& o) 137 { 138 T* optr = o.m_ptr; 139 gcProtectNullTolerant(optr); 140 gcUnprotectNullTolerant(m_ptr); 141 m_ptr = optr; 142 return *this; 143 } 144 145 template <class T> inline ProtectedPtr<T>& ProtectedPtr<T>::operator=(T* optr) 146 { 147 gcProtectNullTolerant(optr); 148 gcUnprotectNullTolerant(m_ptr); 149 m_ptr = optr; 150 return *this; 151 } 152 153 inline ProtectedJSValue::ProtectedJSValue(JSValue value) 154 : m_value(value) 155 { 156 gcProtect(m_value); 157 } 158 159 inline ProtectedJSValue::ProtectedJSValue(const ProtectedJSValue& o) 160 : m_value(o.get()) 161 { 162 gcProtect(m_value); 163 } 164 165 inline ProtectedJSValue::~ProtectedJSValue() 166 { 167 gcUnprotect(m_value); 168 } 169 170 template <class U> ProtectedJSValue::ProtectedJSValue(const ProtectedPtr<U>& o) 171 : m_value(o.get()) 172 { 173 gcProtect(m_value); 174 } 175 176 inline ProtectedJSValue& ProtectedJSValue::operator=(const ProtectedJSValue& o) 177 { 178 JSValue ovalue = o.m_value; 179 gcProtect(ovalue); 180 gcUnprotect(m_value); 181 m_value = ovalue; 182 return *this; 183 } 184 185 inline ProtectedJSValue& ProtectedJSValue::operator=(JSValue ovalue) 186 { 187 gcProtect(ovalue); 188 gcUnprotect(m_value); 189 m_value = ovalue; 190 return *this; 191 } 192 193 template <class T> inline bool operator==(const ProtectedPtr<T>& a, const ProtectedPtr<T>& b) { return a.get() == b.get(); } 194 template <class T> inline bool operator==(const ProtectedPtr<T>& a, const T* b) { return a.get() == b; } 195 template <class T> inline bool operator==(const T* a, const ProtectedPtr<T>& b) { return a == b.get(); } 196 197 template <class T> inline bool operator!=(const ProtectedPtr<T>& a, const ProtectedPtr<T>& b) { return a.get() != b.get(); } 198 template <class T> inline bool operator!=(const ProtectedPtr<T>& a, const T* b) { return a.get() != b; } 199 template <class T> inline bool operator!=(const T* a, const ProtectedPtr<T>& b) { return a != b.get(); } 200 201 inline bool operator==(const ProtectedJSValue& a, const ProtectedJSValue& b) { return a.get() == b.get(); } 202 inline bool operator==(const ProtectedJSValue& a, const JSValue b) { return a.get() == b; } 203 template <class T> inline bool operator==(const ProtectedJSValue& a, const ProtectedPtr<T>& b) { return a.get() == JSValue(b.get()); } 204 inline bool operator==(const JSValue a, const ProtectedJSValue& b) { return a == b.get(); } 205 template <class T> inline bool operator==(const ProtectedPtr<T>& a, const ProtectedJSValue& b) { return JSValue(a.get()) == b.get(); } 206 207 inline bool operator!=(const ProtectedJSValue& a, const ProtectedJSValue& b) { return a.get() != b.get(); } 208 inline bool operator!=(const ProtectedJSValue& a, const JSValue b) { return a.get() != b; } 209 template <class T> inline bool operator!=(const ProtectedJSValue& a, const ProtectedPtr<T>& b) { return a.get() != JSValue(b.get()); } 210 inline bool operator!=(const JSValue a, const ProtectedJSValue& b) { return a != b.get(); } 211 template <class T> inline bool operator!=(const ProtectedPtr<T>& a, const ProtectedJSValue& b) { return JSValue(a.get()) != b.get(); } 212 213 } // namespace JSC 214 215 #endif // Protect_h 216
