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| 1 /* | |
| 2 * Copyright (C) 2009 Google Inc. All rights reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions | |
| 6 * are met: | |
| 7 * 1. Redistributions of source code must retain the above copyright | |
| 8 * notice, this list of conditions and the following disclaimer. | |
| 9 * 2. Redistributions in binary form must reproduce the above copyright | |
| 10 * notice, this list of conditions and the following disclaimer in the | |
| 11 * documentation and/or other materials provided with the distribution. | |
| 12 * | |
| 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' | |
| 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, | |
| 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS | |
| 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
| 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
| 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
| 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF | |
| 23 * THE POSSIBILITY OF SUCH DAMAGE. | |
| 24 */ | |
| 25 | |
| 26 #ifndef SKY_ENGINE_BINDINGS_CORE_V8_V8STRINGRESOURCE_H_ | |
| 27 #define SKY_ENGINE_BINDINGS_CORE_V8_V8STRINGRESOURCE_H_ | |
| 28 | |
| 29 #include "sky/engine/wtf/Threading.h" | |
| 30 #include "sky/engine/wtf/text/AtomicString.h" | |
| 31 #include "sky/engine/wtf/text/WTFString.h" | |
| 32 #include "v8/include/v8.h" | |
| 33 | |
| 34 namespace blink { | |
| 35 | |
| 36 class ExternalStringVisitor; | |
| 37 | |
| 38 // WebCoreStringResource is a helper class for v8ExternalString. It is used | |
| 39 // to manage the life-cycle of the underlying buffer of the external string. | |
| 40 class WebCoreStringResourceBase { | |
| 41 public: | |
| 42 explicit WebCoreStringResourceBase(const String& string) | |
| 43 : m_plainString(string) | |
| 44 { | |
| 45 #if ENABLE(ASSERT) | |
| 46 m_threadId = WTF::currentThread(); | |
| 47 #endif | |
| 48 ASSERT(!string.isNull()); | |
| 49 v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(memoryC
onsumption(string)); | |
| 50 } | |
| 51 | |
| 52 explicit WebCoreStringResourceBase(const AtomicString& string) | |
| 53 : m_plainString(string.string()) | |
| 54 , m_atomicString(string) | |
| 55 { | |
| 56 #if ENABLE(ASSERT) | |
| 57 m_threadId = WTF::currentThread(); | |
| 58 #endif | |
| 59 ASSERT(!string.isNull()); | |
| 60 v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(memoryC
onsumption(string)); | |
| 61 } | |
| 62 | |
| 63 virtual ~WebCoreStringResourceBase() | |
| 64 { | |
| 65 #if ENABLE(ASSERT) | |
| 66 ASSERT(m_threadId == WTF::currentThread()); | |
| 67 #endif | |
| 68 int reducedExternalMemory = -memoryConsumption(m_plainString); | |
| 69 if (m_plainString.impl() != m_atomicString.impl() && !m_atomicString.isN
ull()) | |
| 70 reducedExternalMemory -= memoryConsumption(m_atomicString.string()); | |
| 71 v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(reduced
ExternalMemory); | |
| 72 } | |
| 73 | |
| 74 const String& webcoreString() { return m_plainString; } | |
| 75 | |
| 76 const AtomicString& atomicString() | |
| 77 { | |
| 78 #if ENABLE(ASSERT) | |
| 79 ASSERT(m_threadId == WTF::currentThread()); | |
| 80 #endif | |
| 81 if (m_atomicString.isNull()) { | |
| 82 m_atomicString = AtomicString(m_plainString); | |
| 83 ASSERT(!m_atomicString.isNull()); | |
| 84 if (m_plainString.impl() != m_atomicString.impl()) | |
| 85 v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory
(memoryConsumption(m_atomicString.string())); | |
| 86 } | |
| 87 return m_atomicString; | |
| 88 } | |
| 89 | |
| 90 protected: | |
| 91 // A shallow copy of the string. Keeps the string buffer alive until the V8
engine garbage collects it. | |
| 92 String m_plainString; | |
| 93 // If this string is atomic or has been made atomic earlier the | |
| 94 // atomic string is held here. In the case where the string starts | |
| 95 // off non-atomic and becomes atomic later it is necessary to keep | |
| 96 // the original string alive because v8 may keep derived pointers | |
| 97 // into that string. | |
| 98 AtomicString m_atomicString; | |
| 99 | |
| 100 private: | |
| 101 static int memoryConsumption(const String& string) | |
| 102 { | |
| 103 return string.length() * (string.is8Bit() ? sizeof(LChar) : sizeof(UChar
)); | |
| 104 } | |
| 105 #if ENABLE(ASSERT) | |
| 106 WTF::ThreadIdentifier m_threadId; | |
| 107 #endif | |
| 108 }; | |
| 109 | |
| 110 class WebCoreStringResource16 final : public WebCoreStringResourceBase, public v
8::String::ExternalStringResource { | |
| 111 public: | |
| 112 explicit WebCoreStringResource16(const String& string) | |
| 113 : WebCoreStringResourceBase(string) | |
| 114 { | |
| 115 ASSERT(!string.is8Bit()); | |
| 116 } | |
| 117 | |
| 118 explicit WebCoreStringResource16(const AtomicString& string) | |
| 119 : WebCoreStringResourceBase(string) | |
| 120 { | |
| 121 ASSERT(!string.is8Bit()); | |
| 122 } | |
| 123 | |
| 124 virtual size_t length() const override { return m_plainString.impl()->length
(); } | |
| 125 virtual const uint16_t* data() const override | |
| 126 { | |
| 127 return reinterpret_cast<const uint16_t*>(m_plainString.impl()->character
s16()); | |
| 128 } | |
| 129 }; | |
| 130 | |
| 131 class WebCoreStringResource8 final : public WebCoreStringResourceBase, public v8
::String::ExternalOneByteStringResource { | |
| 132 public: | |
| 133 explicit WebCoreStringResource8(const String& string) | |
| 134 : WebCoreStringResourceBase(string) | |
| 135 { | |
| 136 ASSERT(string.is8Bit()); | |
| 137 } | |
| 138 | |
| 139 explicit WebCoreStringResource8(const AtomicString& string) | |
| 140 : WebCoreStringResourceBase(string) | |
| 141 { | |
| 142 ASSERT(string.is8Bit()); | |
| 143 } | |
| 144 | |
| 145 virtual size_t length() const override { return m_plainString.impl()->length
(); } | |
| 146 virtual const char* data() const override | |
| 147 { | |
| 148 return reinterpret_cast<const char*>(m_plainString.impl()->characters8()
); | |
| 149 } | |
| 150 }; | |
| 151 | |
| 152 enum ExternalMode { | |
| 153 Externalize, | |
| 154 DoNotExternalize | |
| 155 }; | |
| 156 | |
| 157 template <typename StringType> | |
| 158 StringType v8StringToWebCoreString(v8::Handle<v8::String>, ExternalMode); | |
| 159 String int32ToWebCoreString(int value); | |
| 160 | |
| 161 // V8StringResource is an adapter class that converts V8 values to Strings | |
| 162 // or AtomicStrings as appropriate, using multiple typecast operators. | |
| 163 enum V8StringResourceMode { | |
| 164 DefaultMode, | |
| 165 TreatNullAsEmptyString, | |
| 166 TreatNullAsNullString, | |
| 167 TreatNullAndUndefinedAsNullString | |
| 168 }; | |
| 169 | |
| 170 template <V8StringResourceMode Mode = DefaultMode> | |
| 171 class V8StringResource { | |
| 172 public: | |
| 173 V8StringResource() | |
| 174 : m_mode(Externalize) | |
| 175 { | |
| 176 } | |
| 177 | |
| 178 V8StringResource(v8::Handle<v8::Value> object) | |
| 179 : m_v8Object(object) | |
| 180 , m_mode(Externalize) | |
| 181 { | |
| 182 } | |
| 183 | |
| 184 void operator=(v8::Handle<v8::Value> object) | |
| 185 { | |
| 186 m_v8Object = object; | |
| 187 } | |
| 188 | |
| 189 void operator=(const String& string) | |
| 190 { | |
| 191 setString(string); | |
| 192 } | |
| 193 | |
| 194 void operator=(std::nullptr_t) | |
| 195 { | |
| 196 setString(String()); | |
| 197 } | |
| 198 | |
| 199 bool prepare() | |
| 200 { | |
| 201 if (m_v8Object.IsEmpty()) | |
| 202 return true; | |
| 203 | |
| 204 if (!isValid()) { | |
| 205 setString(fallbackString()); | |
| 206 return true; | |
| 207 } | |
| 208 | |
| 209 if (LIKELY(m_v8Object->IsString())) | |
| 210 return true; | |
| 211 | |
| 212 if (LIKELY(m_v8Object->IsInt32())) { | |
| 213 setString(int32ToWebCoreString(m_v8Object->Int32Value())); | |
| 214 return true; | |
| 215 } | |
| 216 | |
| 217 m_mode = DoNotExternalize; | |
| 218 v8::TryCatch block; | |
| 219 m_v8Object = m_v8Object->ToString(); | |
| 220 // Handle the case where an exception is thrown as part of invoking toSt
ring on the object. | |
| 221 if (block.HasCaught()) { | |
| 222 block.ReThrow(); | |
| 223 return false; | |
| 224 } | |
| 225 return true; | |
| 226 } | |
| 227 operator String() const { return toString<String>(); } | |
| 228 operator AtomicString() const { return toString<AtomicString>(); } | |
| 229 | |
| 230 private: | |
| 231 bool isValid() const; | |
| 232 String fallbackString() const; | |
| 233 | |
| 234 void setString(const String& string) | |
| 235 { | |
| 236 m_string = string; | |
| 237 m_v8Object.Clear(); // To signal that String is ready. | |
| 238 } | |
| 239 | |
| 240 template <class StringType> | |
| 241 StringType toString() const | |
| 242 { | |
| 243 if (LIKELY(!m_v8Object.IsEmpty())) | |
| 244 return v8StringToWebCoreString<StringType>(const_cast<v8::Handle<v8:
:Value>*>(&m_v8Object)->As<v8::String>(), m_mode); | |
| 245 | |
| 246 return StringType(m_string); | |
| 247 } | |
| 248 | |
| 249 v8::Handle<v8::Value> m_v8Object; | |
| 250 ExternalMode m_mode; | |
| 251 String m_string; | |
| 252 }; | |
| 253 | |
| 254 template<> inline bool V8StringResource<DefaultMode>::isValid() const | |
| 255 { | |
| 256 return true; | |
| 257 } | |
| 258 | |
| 259 template<> inline String V8StringResource<DefaultMode>::fallbackString() const | |
| 260 { | |
| 261 ASSERT_NOT_REACHED(); | |
| 262 return String(); | |
| 263 } | |
| 264 | |
| 265 template<> inline bool V8StringResource<TreatNullAsEmptyString>::isValid() const | |
| 266 { | |
| 267 return !m_v8Object->IsNull(); | |
| 268 } | |
| 269 | |
| 270 template<> inline String V8StringResource<TreatNullAsEmptyString>::fallbackStrin
g() const | |
| 271 { | |
| 272 return emptyString(); | |
| 273 } | |
| 274 | |
| 275 template<> inline bool V8StringResource<TreatNullAsNullString>::isValid() const | |
| 276 { | |
| 277 return !m_v8Object->IsNull(); | |
| 278 } | |
| 279 | |
| 280 template<> inline String V8StringResource<TreatNullAsNullString>::fallbackString
() const | |
| 281 { | |
| 282 return String(); | |
| 283 } | |
| 284 | |
| 285 template<> inline bool V8StringResource<TreatNullAndUndefinedAsNullString>::isVa
lid() const | |
| 286 { | |
| 287 return !m_v8Object->IsNull() && !m_v8Object->IsUndefined(); | |
| 288 } | |
| 289 | |
| 290 template<> inline String V8StringResource<TreatNullAndUndefinedAsNullString>::fa
llbackString() const | |
| 291 { | |
| 292 return String(); | |
| 293 } | |
| 294 | |
| 295 } // namespace blink | |
| 296 | |
| 297 #endif // SKY_ENGINE_BINDINGS_CORE_V8_V8STRINGRESOURCE_H_ | |
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Chromium Code Reviews
Issue 922053002:
Remove unused V8 integration code in Sky (Closed)
Base URL: git@github.com:domokit/mojo.git@master