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| 1 // Copyright 2014 the V8 project authors. All rights reserved. | |
| 2 // Redistribution and use in source and binary forms, with or without | |
| 3 // modification, are permitted provided that the following conditions are | |
| 4 // met: | |
| 5 // | |
| 6 // * Redistributions of source code must retain the above copyright | |
| 7 // notice, this list of conditions and the following disclaimer. | |
| 8 // * Redistributions in binary form must reproduce the above | |
| 9 // copyright notice, this list of conditions and the following | |
| 10 // disclaimer in the documentation and/or other materials provided | |
| 11 // with the distribution. | |
| 12 // * Neither the name of Google Inc. nor the names of its | |
| 13 // contributors may be used to endorse or promote products derived | |
| 14 // from this software without specific prior written permission. | |
| 15 // | |
| 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 27 | |
| 28 #ifndef V8_AST_VALUE_FACTORY_H_ | |
| 29 #define V8_AST_VALUE_FACTORY_H_ | |
| 30 | |
| 31 #include "src/api.h" | |
| 32 #include "src/hashmap.h" | |
| 33 #include "src/utils.h" | |
| 34 | |
| 35 // AstString, AstValue and AstValueFactory are for storing strings and values | |
| 36 // independent of the V8 heap and internalizing them later. During parsing, | |
| 37 // AstStrings and AstValues are created and stored outside the heap, in | |
| 38 // AstValueFactory. After parsing, the strings and values are internalized | |
| 39 // (moved into the V8 heap). | |
| 40 namespace v8 { | |
| 41 namespace internal { | |
| 42 | |
| 43 class AstString : public ZoneObject { | |
| 44 public: | |
| 45 virtual ~AstString() {} | |
| 46 | |
| 47 virtual int length() const = 0; | |
| 48 bool IsEmpty() const { return length() == 0; } | |
| 49 | |
| 50 // Puts the string into the V8 heap. | |
| 51 virtual void Internalize(Isolate* isolate) = 0; | |
| 52 | |
| 53 // This function can be called after internalizing. | |
| 54 V8_INLINE Handle<String> string() const { | |
| 55 DCHECK(!string_.is_null()); | |
| 56 return string_; | |
| 57 } | |
| 58 | |
| 59 protected: | |
| 60 // This is null until the string is internalized. | |
| 61 Handle<String> string_; | |
| 62 }; | |
| 63 | |
| 64 | |
| 65 class AstRawString : public AstString { | |
| 66 public: | |
| 67 int length() const override { | |
| 68 if (is_one_byte_) | |
| 69 return literal_bytes_.length(); | |
| 70 return literal_bytes_.length() / 2; | |
| 71 } | |
| 72 | |
| 73 int byte_length() const { return literal_bytes_.length(); } | |
| 74 | |
| 75 void Internalize(Isolate* isolate) override; | |
| 76 | |
| 77 bool AsArrayIndex(uint32_t* index) const; | |
| 78 | |
| 79 // The string is not null-terminated, use length() to find out the length. | |
| 80 const unsigned char* raw_data() const { | |
| 81 return literal_bytes_.start(); | |
| 82 } | |
| 83 bool is_one_byte() const { return is_one_byte_; } | |
| 84 bool IsOneByteEqualTo(const char* data) const; | |
| 85 uint16_t FirstCharacter() const { | |
| 86 if (is_one_byte_) | |
| 87 return literal_bytes_[0]; | |
| 88 const uint16_t* c = | |
| 89 reinterpret_cast<const uint16_t*>(literal_bytes_.start()); | |
| 90 return *c; | |
| 91 } | |
| 92 | |
| 93 // For storing AstRawStrings in a hash map. | |
| 94 uint32_t hash() const { | |
| 95 return hash_; | |
| 96 } | |
| 97 | |
| 98 private: | |
| 99 friend class AstValueFactory; | |
| 100 friend class AstRawStringInternalizationKey; | |
| 101 | |
| 102 AstRawString(bool is_one_byte, const Vector<const byte>& literal_bytes, | |
| 103 uint32_t hash) | |
| 104 : is_one_byte_(is_one_byte), literal_bytes_(literal_bytes), hash_(hash) {} | |
| 105 | |
| 106 AstRawString() | |
| 107 : is_one_byte_(true), | |
| 108 hash_(0) {} | |
| 109 | |
| 110 bool is_one_byte_; | |
| 111 | |
| 112 // Points to memory owned by Zone. | |
| 113 Vector<const byte> literal_bytes_; | |
| 114 uint32_t hash_; | |
| 115 }; | |
| 116 | |
| 117 | |
| 118 class AstConsString : public AstString { | |
| 119 public: | |
| 120 AstConsString(const AstString* left, const AstString* right) | |
| 121 : left_(left), | |
| 122 right_(right) {} | |
| 123 | |
| 124 int length() const override { return left_->length() + right_->length(); } | |
| 125 | |
| 126 void Internalize(Isolate* isolate) override; | |
| 127 | |
| 128 private: | |
| 129 friend class AstValueFactory; | |
| 130 | |
| 131 const AstString* left_; | |
| 132 const AstString* right_; | |
| 133 }; | |
| 134 | |
| 135 | |
| 136 // AstValue is either a string, a number, a string array, a boolean, or a | |
| 137 // special value (null, undefined, the hole). | |
| 138 class AstValue : public ZoneObject { | |
| 139 public: | |
| 140 bool IsString() const { | |
| 141 return type_ == STRING; | |
| 142 } | |
| 143 | |
| 144 bool IsNumber() const { | |
| 145 return type_ == NUMBER || type_ == NUMBER_WITH_DOT || type_ == SMI; | |
| 146 } | |
| 147 | |
| 148 bool ContainsDot() const { return type_ == NUMBER_WITH_DOT; } | |
| 149 | |
| 150 const AstRawString* AsString() const { | |
| 151 if (type_ == STRING) | |
| 152 return string_; | |
| 153 UNREACHABLE(); | |
| 154 return 0; | |
| 155 } | |
| 156 | |
| 157 double AsNumber() const { | |
| 158 if (type_ == NUMBER || type_ == NUMBER_WITH_DOT) | |
| 159 return number_; | |
| 160 if (type_ == SMI) | |
| 161 return smi_; | |
| 162 UNREACHABLE(); | |
| 163 return 0; | |
| 164 } | |
| 165 | |
| 166 bool EqualsString(const AstRawString* string) const { | |
| 167 return type_ == STRING && string_ == string; | |
| 168 } | |
| 169 | |
| 170 bool IsPropertyName() const; | |
| 171 | |
| 172 bool BooleanValue() const; | |
| 173 | |
| 174 bool IsTheHole() const { return type_ == THE_HOLE; } | |
| 175 | |
| 176 void Internalize(Isolate* isolate); | |
| 177 | |
| 178 // Can be called after Internalize has been called. | |
| 179 V8_INLINE Handle<Object> value() const { | |
| 180 if (type_ == STRING) { | |
| 181 return string_->string(); | |
| 182 } | |
| 183 DCHECK(!value_.is_null()); | |
| 184 return value_; | |
| 185 } | |
| 186 | |
| 187 private: | |
| 188 friend class AstValueFactory; | |
| 189 | |
| 190 enum Type { | |
| 191 STRING, | |
| 192 SYMBOL, | |
| 193 NUMBER, | |
| 194 NUMBER_WITH_DOT, | |
| 195 SMI, | |
| 196 BOOLEAN, | |
| 197 NULL_TYPE, | |
| 198 UNDEFINED, | |
| 199 THE_HOLE | |
| 200 }; | |
| 201 | |
| 202 explicit AstValue(const AstRawString* s) : type_(STRING) { string_ = s; } | |
| 203 | |
| 204 explicit AstValue(const char* name) : type_(SYMBOL) { symbol_name_ = name; } | |
| 205 | |
| 206 explicit AstValue(double n, bool with_dot) { | |
| 207 if (with_dot) { | |
| 208 type_ = NUMBER_WITH_DOT; | |
| 209 } else { | |
| 210 type_ = NUMBER; | |
| 211 } | |
| 212 number_ = n; | |
| 213 } | |
| 214 | |
| 215 AstValue(Type t, int i) : type_(t) { | |
| 216 DCHECK(type_ == SMI); | |
| 217 smi_ = i; | |
| 218 } | |
| 219 | |
| 220 explicit AstValue(bool b) : type_(BOOLEAN) { bool_ = b; } | |
| 221 | |
| 222 explicit AstValue(Type t) : type_(t) { | |
| 223 DCHECK(t == NULL_TYPE || t == UNDEFINED || t == THE_HOLE); | |
| 224 } | |
| 225 | |
| 226 Type type_; | |
| 227 | |
| 228 // Uninternalized value. | |
| 229 union { | |
| 230 const AstRawString* string_; | |
| 231 double number_; | |
| 232 int smi_; | |
| 233 bool bool_; | |
| 234 ZoneList<const AstRawString*>* strings_; | |
| 235 const char* symbol_name_; | |
| 236 }; | |
| 237 | |
| 238 // Internalized value (empty before internalized). | |
| 239 Handle<Object> value_; | |
| 240 }; | |
| 241 | |
| 242 | |
| 243 // For generating constants. | |
| 244 #define STRING_CONSTANTS(F) \ | |
| 245 F(anonymous_function, "(anonymous function)") \ | |
| 246 F(arguments, "arguments") \ | |
| 247 F(constructor, "constructor") \ | |
| 248 F(default, "default") \ | |
| 249 F(done, "done") \ | |
| 250 F(dot, ".") \ | |
| 251 F(dot_for, ".for") \ | |
| 252 F(dot_generator, ".generator") \ | |
| 253 F(dot_generator_object, ".generator_object") \ | |
| 254 F(dot_iterator, ".iterator") \ | |
| 255 F(dot_module, ".module") \ | |
| 256 F(dot_result, ".result") \ | |
| 257 F(dot_switch_tag, ".switch_tag") \ | |
| 258 F(dot_catch, ".catch") \ | |
| 259 F(empty, "") \ | |
| 260 F(eval, "eval") \ | |
| 261 F(let, "let") \ | |
| 262 F(native, "native") \ | |
| 263 F(new_target, ".new.target") \ | |
| 264 F(next, "next") \ | |
| 265 F(proto, "__proto__") \ | |
| 266 F(prototype, "prototype") \ | |
| 267 F(rest_parameter, ".rest_parameter") \ | |
| 268 F(this, "this") \ | |
| 269 F(this_function, ".this_function") \ | |
| 270 F(undefined, "undefined") \ | |
| 271 F(use_asm, "use asm") \ | |
| 272 F(use_strong, "use strong") \ | |
| 273 F(use_strict, "use strict") \ | |
| 274 F(value, "value") | |
| 275 | |
| 276 #define OTHER_CONSTANTS(F) \ | |
| 277 F(true_value) \ | |
| 278 F(false_value) \ | |
| 279 F(null_value) \ | |
| 280 F(undefined_value) \ | |
| 281 F(the_hole_value) | |
| 282 | |
| 283 class AstValueFactory { | |
| 284 public: | |
| 285 AstValueFactory(Zone* zone, uint32_t hash_seed) | |
| 286 : string_table_(AstRawStringCompare), | |
| 287 zone_(zone), | |
| 288 isolate_(NULL), | |
| 289 hash_seed_(hash_seed) { | |
| 290 #define F(name, str) name##_string_ = NULL; | |
| 291 STRING_CONSTANTS(F) | |
| 292 #undef F | |
| 293 #define F(name) name##_ = NULL; | |
| 294 OTHER_CONSTANTS(F) | |
| 295 #undef F | |
| 296 } | |
| 297 | |
| 298 Zone* zone() const { return zone_; } | |
| 299 | |
| 300 const AstRawString* GetOneByteString(Vector<const uint8_t> literal) { | |
| 301 return GetOneByteStringInternal(literal); | |
| 302 } | |
| 303 const AstRawString* GetOneByteString(const char* string) { | |
| 304 return GetOneByteString(Vector<const uint8_t>( | |
| 305 reinterpret_cast<const uint8_t*>(string), StrLength(string))); | |
| 306 } | |
| 307 const AstRawString* GetTwoByteString(Vector<const uint16_t> literal) { | |
| 308 return GetTwoByteStringInternal(literal); | |
| 309 } | |
| 310 const AstRawString* GetString(Handle<String> literal); | |
| 311 const AstConsString* NewConsString(const AstString* left, | |
| 312 const AstString* right); | |
| 313 | |
| 314 void Internalize(Isolate* isolate); | |
| 315 bool IsInternalized() { | |
| 316 return isolate_ != NULL; | |
| 317 } | |
| 318 | |
| 319 #define F(name, str) \ | |
| 320 const AstRawString* name##_string() { \ | |
| 321 if (name##_string_ == NULL) { \ | |
| 322 const char* data = str; \ | |
| 323 name##_string_ = GetOneByteString( \ | |
| 324 Vector<const uint8_t>(reinterpret_cast<const uint8_t*>(data), \ | |
| 325 static_cast<int>(strlen(data)))); \ | |
| 326 } \ | |
| 327 return name##_string_; \ | |
| 328 } | |
| 329 STRING_CONSTANTS(F) | |
| 330 #undef F | |
| 331 | |
| 332 const AstValue* NewString(const AstRawString* string); | |
| 333 // A JavaScript symbol (ECMA-262 edition 6). | |
| 334 const AstValue* NewSymbol(const char* name); | |
| 335 const AstValue* NewNumber(double number, bool with_dot = false); | |
| 336 const AstValue* NewSmi(int number); | |
| 337 const AstValue* NewBoolean(bool b); | |
| 338 const AstValue* NewStringList(ZoneList<const AstRawString*>* strings); | |
| 339 const AstValue* NewNull(); | |
| 340 const AstValue* NewUndefined(); | |
| 341 const AstValue* NewTheHole(); | |
| 342 | |
| 343 private: | |
| 344 AstRawString* GetOneByteStringInternal(Vector<const uint8_t> literal); | |
| 345 AstRawString* GetTwoByteStringInternal(Vector<const uint16_t> literal); | |
| 346 AstRawString* GetString(uint32_t hash, bool is_one_byte, | |
| 347 Vector<const byte> literal_bytes); | |
| 348 | |
| 349 static bool AstRawStringCompare(void* a, void* b); | |
| 350 | |
| 351 // All strings are copied here, one after another (no NULLs inbetween). | |
| 352 HashMap string_table_; | |
| 353 // For keeping track of all AstValues and AstRawStrings we've created (so that | |
| 354 // they can be internalized later). | |
| 355 List<AstValue*> values_; | |
| 356 List<AstString*> strings_; | |
| 357 Zone* zone_; | |
| 358 Isolate* isolate_; | |
| 359 | |
| 360 uint32_t hash_seed_; | |
| 361 | |
| 362 #define F(name, str) const AstRawString* name##_string_; | |
| 363 STRING_CONSTANTS(F) | |
| 364 #undef F | |
| 365 | |
| 366 #define F(name) AstValue* name##_; | |
| 367 OTHER_CONSTANTS(F) | |
| 368 #undef F | |
| 369 }; | |
| 370 } // namespace internal | |
| 371 } // namespace v8 | |
| 372 | |
| 373 #undef STRING_CONSTANTS | |
| 374 #undef OTHER_CONSTANTS | |
| 375 | |
| 376 #endif // V8_AST_VALUE_FACTORY_H_ | |
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Chromium Code Reviews
Issue 1481613002:
Create ast/ and parsing/ subdirectories and move appropriate files (Closed)
Base URL: https://chromium.googlesource.com/v8/v8.git@master