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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_STRING_TABLE_H_ |
| 29 #define V8_AST_STRING_TABLE_H_ |
| 30 |
| 31 #include "api.h" |
| 32 #include "hashmap.h" |
| 33 #include "utils.h" |
| 34 |
| 35 // AstString, AstValue and AstStringTable 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 // AstStringTable. After parsing, the strings and values are internalized (moved |
| 39 // into the V8 heap). |
| 40 namespace v8 { |
| 41 namespace internal { |
| 42 |
| 43 class AstString { |
| 44 public: |
| 45 AstString(bool i, Vector<const byte> lb, int h) |
| 46 : is_one_byte_(i), |
| 47 literal_bytes_(lb), |
| 48 hash_(h) {} |
| 49 |
| 50 AstString() |
| 51 : is_one_byte_(true), |
| 52 hash_(0) {} |
| 53 |
| 54 bool AsArrayIndex(uint32_t* index) const; |
| 55 |
| 56 // The string is not NULL-terminated, use length() to find out the length. |
| 57 const unsigned char* raw_data() const { return literal_bytes_.start(); } |
| 58 int length() const { return literal_bytes_.length(); } |
| 59 bool is_one_byte() const { return is_one_byte_; } |
| 60 bool IsOneByteEqualTo(const char* data) const; |
| 61 |
| 62 // Puts the string into the V8 heap. |
| 63 void Internalize(Isolate* isolate); |
| 64 |
| 65 // This function can be called after internalizing. |
| 66 V8_INLINE Handle<String> string() const { |
| 67 ASSERT(!string_.is_null()); |
| 68 return string_; |
| 69 } |
| 70 |
| 71 // For storing AstStrings in a hash map. |
| 72 int hash() const { return hash_; } |
| 73 static bool Compare(void* a, void* b); |
| 74 |
| 75 private: |
| 76 friend class AstStringTable; |
| 77 |
| 78 bool is_one_byte_; |
| 79 // Weak. Points to memory owned by AstStringTable. |
| 80 Vector<const byte> literal_bytes_; |
| 81 int hash_; |
| 82 |
| 83 // This is null until the string is internalized. |
| 84 Handle<String> string_; |
| 85 }; |
| 86 |
| 87 |
| 88 // AstValue is either a string, a number, a string array, a boolean, or a |
| 89 // special value (null, undefined, the hole). |
| 90 class AstValue : public ZoneObject { |
| 91 public: |
| 92 enum Type { |
| 93 STRING, |
| 94 NUMBER, |
| 95 SMI, |
| 96 BOOLEAN, |
| 97 STRING_ARRAY, |
| 98 NULL_TYPE, |
| 99 UNDEFINED, |
| 100 THE_HOLE |
| 101 }; |
| 102 |
| 103 bool IsString() const { |
| 104 return type_ == STRING; |
| 105 } |
| 106 |
| 107 bool IsNumber() const { |
| 108 return type_ == NUMBER || type_ == SMI; |
| 109 } |
| 110 |
| 111 const AstString* AsString() const { |
| 112 if (type_ == STRING) |
| 113 return string_; |
| 114 UNREACHABLE(); |
| 115 return 0; |
| 116 } |
| 117 |
| 118 double AsNumber() const { |
| 119 if (type_ == NUMBER) |
| 120 return number_; |
| 121 if (type_ == SMI) |
| 122 return smi_; |
| 123 UNREACHABLE(); |
| 124 return 0; |
| 125 } |
| 126 |
| 127 bool EqualsString(const AstString* string) const { |
| 128 return type_ == STRING && string_ == string; |
| 129 } |
| 130 |
| 131 bool IsPropertyName() const; |
| 132 |
| 133 bool BooleanValue() const; |
| 134 |
| 135 void Internalize(Isolate* isolate); |
| 136 |
| 137 // Can be called after Internalize has been called. |
| 138 V8_INLINE Handle<Object> value() const { |
| 139 if (type_ == STRING) { |
| 140 return string_->string(); |
| 141 } |
| 142 ASSERT(!value_.is_null()); |
| 143 return value_; |
| 144 } |
| 145 |
| 146 private: |
| 147 friend class AstStringTable; |
| 148 |
| 149 explicit AstValue(const AstString* s) : |
| 150 type_(STRING) { |
| 151 string_ = s; |
| 152 } |
| 153 |
| 154 explicit AstValue(double n) : |
| 155 type_(NUMBER) { |
| 156 number_ = n; |
| 157 } |
| 158 |
| 159 AstValue(Type t, int i) : |
| 160 type_(t) { |
| 161 ASSERT(type_ == SMI); |
| 162 smi_ = i; |
| 163 } |
| 164 |
| 165 explicit AstValue(bool b) : |
| 166 type_(BOOLEAN) { |
| 167 bool_ = b; |
| 168 } |
| 169 |
| 170 explicit AstValue(ZoneList<const AstString*>* s) : |
| 171 type_(STRING_ARRAY) { |
| 172 strings_ = s; |
| 173 } |
| 174 |
| 175 explicit AstValue(Type t) : |
| 176 type_(t) {} |
| 177 |
| 178 Type type_; |
| 179 |
| 180 // Uninternalized value. |
| 181 union { |
| 182 const AstString* string_; |
| 183 double number_; |
| 184 int smi_; |
| 185 bool bool_; |
| 186 ZoneList<const AstString*>* strings_; |
| 187 }; |
| 188 |
| 189 // Internalized value (empty before internalized). |
| 190 Handle<Object> value_; |
| 191 }; |
| 192 |
| 193 |
| 194 // For generating string constants. |
| 195 #define STRING_CONSTANTS(F) \ |
| 196 F(anonymous_function, "(anonymous function)") \ |
| 197 F(arguments, "arguments") \ |
| 198 F(done, "done") \ |
| 199 F(dot_for, ".for") \ |
| 200 F(dot_generator, ".generator") \ |
| 201 F(dot_generator_object, ".generator_object") \ |
| 202 F(dot_iterator, ".iterator") \ |
| 203 F(dot_module, ".module") \ |
| 204 F(dot_result, ".result") \ |
| 205 F(empty, "") \ |
| 206 F(eval, "eval") \ |
| 207 F(initialize_const_global, "initializeConstGlobal") \ |
| 208 F(initialize_var_global, "initializeVarGlobal") \ |
| 209 F(make_reference_error, "MakeReferenceError") \ |
| 210 F(make_syntax_error, "MakeSyntaxError") \ |
| 211 F(make_type_error, "MakeTypeError") \ |
| 212 F(module, "module") \ |
| 213 F(native, "native") \ |
| 214 F(next, "next") \ |
| 215 F(proto, "__proto__") \ |
| 216 F(prototype, "prototype") \ |
| 217 F(this, "this") \ |
| 218 F(use_strict, "use strict") \ |
| 219 F(value, "value") |
| 220 |
| 221 class AstStringTable { |
| 222 public: |
| 223 explicit AstStringTable(Zone* zone) |
| 224 : literal_chars_(0), |
| 225 string_table_keys_(0), |
| 226 string_table_(AstString::Compare), |
| 227 zone_(zone), |
| 228 isolate_(NULL) { |
| 229 #define F(name, str) { \ |
| 230 const char* data = str; \ |
| 231 name##_string_ = GetOneByteString( \ |
| 232 Vector<const uint8_t>(reinterpret_cast<const uint8_t*>(data), \ |
| 233 strlen(data))); \ |
| 234 } |
| 235 STRING_CONSTANTS(F) |
| 236 #undef F |
| 237 } |
| 238 |
| 239 const AstString* GetOneByteString(Vector<const uint8_t> literal); |
| 240 const AstString* GetTwoByteString(Vector<const uint16_t> literal); |
| 241 const AstString* GetString(Handle<String> literal); |
| 242 |
| 243 void Internalize(Isolate* isolate); |
| 244 |
| 245 #define F(name, str) \ |
| 246 const AstString* name##_string() const { return name##_string_; } |
| 247 STRING_CONSTANTS(F) |
| 248 #undef F |
| 249 |
| 250 const AstValue* NewValue(const AstString* string); |
| 251 const AstValue* NewNumberValue(double number); |
| 252 const AstValue* NewSmiValue(int number); |
| 253 const AstValue* NewValue(bool b); |
| 254 const AstValue* NewValue(ZoneList<const AstString*>* strings); |
| 255 const AstValue* NewValue(AstValue::Type t); |
| 256 |
| 257 private: |
| 258 const AstString* GetString(int hash, bool is_one_byte, |
| 259 Vector<const byte> literal_bytes); |
| 260 |
| 261 // All strings are copied here, one after another (no NULLs inbetween). |
| 262 Collector<byte> literal_chars_; |
| 263 // List of all AstStrings we have created; keys of string_table_ are pointers |
| 264 // into AstStrings in string_table_keys_. |
| 265 Collector<AstString> string_table_keys_; |
| 266 HashMap string_table_; |
| 267 // For keeping track of all AstValues we've created (so that they can be |
| 268 // internalized later). |
| 269 List<AstValue*> values_; |
| 270 Zone* zone_; |
| 271 Isolate* isolate_; |
| 272 |
| 273 #define F(name, str) \ |
| 274 const AstString* name##_string_; |
| 275 STRING_CONSTANTS(F) |
| 276 #undef F |
| 277 }; |
| 278 |
| 279 } } // namespace v8::internal |
| 280 |
| 281 #undef STRING_CONSTANTS |
| 282 |
| 283 #endif // V8_AST_STRING_TABLE_H_ |
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