ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 1 | // Copyright 2006-2008 the V8 project authors. All rights reserved. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 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_JSREGEXP_H_ |
| 29 | #define V8_JSREGEXP_H_ |
| 30 | |
| 31 | namespace v8 { namespace internal { |
| 32 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 33 | |
| 34 | class RegExpMacroAssembler; |
| 35 | |
| 36 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 37 | class RegExpImpl { |
| 38 | public: |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 39 | static inline bool UseNativeRegexp() { |
ager@chromium.org | 9085a01 | 2009-05-11 19:22:57 +0000 | [diff] [blame] | 40 | #ifdef V8_TARGET_ARCH_IA32 |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 41 | return FLAG_regexp_native; |
ager@chromium.org | 9085a01 | 2009-05-11 19:22:57 +0000 | [diff] [blame] | 42 | #else |
| 43 | return false; |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 44 | #endif |
| 45 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 46 | // Creates a regular expression literal in the old space. |
| 47 | // This function calls the garbage collector if necessary. |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 48 | static Handle<Object> CreateRegExpLiteral(Handle<JSFunction> constructor, |
| 49 | Handle<String> pattern, |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 50 | Handle<String> flags, |
| 51 | bool* has_pending_exception); |
| 52 | |
| 53 | // Returns a string representation of a regular expression. |
| 54 | // Implements RegExp.prototype.toString, see ECMA-262 section 15.10.6.4. |
| 55 | // This function calls the garbage collector if necessary. |
| 56 | static Handle<String> ToString(Handle<Object> value); |
| 57 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 58 | // Parses the RegExp pattern and prepares the JSRegExp object with |
| 59 | // generic data and choice of implementation - as well as what |
| 60 | // the implementation wants to store in the data field. |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 61 | // Returns false if compilation fails. |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 62 | static Handle<Object> Compile(Handle<JSRegExp> re, |
| 63 | Handle<String> pattern, |
| 64 | Handle<String> flags); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 65 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 66 | // See ECMA-262 section 15.10.6.2. |
| 67 | // This function calls the garbage collector if necessary. |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 68 | static Handle<Object> Exec(Handle<JSRegExp> regexp, |
| 69 | Handle<String> subject, |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 70 | int index, |
| 71 | Handle<JSArray> lastMatchInfo); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 72 | |
| 73 | // Call RegExp.prototyp.exec(string) in a loop. |
| 74 | // Used by String.prototype.match and String.prototype.replace. |
| 75 | // This function calls the garbage collector if necessary. |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 76 | static Handle<Object> ExecGlobal(Handle<JSRegExp> regexp, |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 77 | Handle<String> subject, |
| 78 | Handle<JSArray> lastMatchInfo); |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 79 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 80 | // Prepares a JSRegExp object with Irregexp-specific data. |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 81 | static void IrregexpPrepare(Handle<JSRegExp> re, |
| 82 | Handle<String> pattern, |
| 83 | JSRegExp::Flags flags, |
| 84 | int capture_register_count); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 85 | |
| 86 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 87 | static void AtomCompile(Handle<JSRegExp> re, |
| 88 | Handle<String> pattern, |
| 89 | JSRegExp::Flags flags, |
| 90 | Handle<String> match_pattern); |
| 91 | |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 92 | static Handle<Object> AtomExec(Handle<JSRegExp> regexp, |
| 93 | Handle<String> subject, |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 94 | int index, |
| 95 | Handle<JSArray> lastMatchInfo); |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 96 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 97 | // Execute an Irregexp bytecode pattern. |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 98 | // On a successful match, the result is a JSArray containing |
| 99 | // captured positions. On a failure, the result is the null value. |
| 100 | // Returns an empty handle in case of an exception. |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 101 | static Handle<Object> IrregexpExec(Handle<JSRegExp> regexp, |
| 102 | Handle<String> subject, |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 103 | int index, |
| 104 | Handle<JSArray> lastMatchInfo); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 105 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 106 | // Offsets in the lastMatchInfo array. |
| 107 | static const int kLastCaptureCount = 0; |
| 108 | static const int kLastSubject = 1; |
| 109 | static const int kLastInput = 2; |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 110 | static const int kFirstCapture = 3; |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 111 | static const int kLastMatchOverhead = 3; |
| 112 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 113 | // Used to access the lastMatchInfo array. |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 114 | static int GetCapture(FixedArray* array, int index) { |
| 115 | return Smi::cast(array->get(index + kFirstCapture))->value(); |
| 116 | } |
| 117 | |
| 118 | static void SetLastCaptureCount(FixedArray* array, int to) { |
| 119 | array->set(kLastCaptureCount, Smi::FromInt(to)); |
| 120 | } |
| 121 | |
| 122 | static void SetLastSubject(FixedArray* array, String* to) { |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 123 | array->set(kLastSubject, to); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 124 | } |
| 125 | |
| 126 | static void SetLastInput(FixedArray* array, String* to) { |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 127 | array->set(kLastInput, to); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 128 | } |
| 129 | |
| 130 | static void SetCapture(FixedArray* array, int index, int to) { |
| 131 | array->set(index + kFirstCapture, Smi::FromInt(to)); |
| 132 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 133 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 134 | static int GetLastCaptureCount(FixedArray* array) { |
| 135 | return Smi::cast(array->get(kLastCaptureCount))->value(); |
| 136 | } |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 137 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 138 | // For acting on the JSRegExp data FixedArray. |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 139 | static int IrregexpMaxRegisterCount(FixedArray* re); |
| 140 | static void SetIrregexpMaxRegisterCount(FixedArray* re, int value); |
| 141 | static int IrregexpNumberOfCaptures(FixedArray* re); |
| 142 | static int IrregexpNumberOfRegisters(FixedArray* re); |
| 143 | static ByteArray* IrregexpByteCode(FixedArray* re, bool is_ascii); |
| 144 | static Code* IrregexpNativeCode(FixedArray* re, bool is_ascii); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 145 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 146 | private: |
| 147 | static String* last_ascii_string_; |
| 148 | static String* two_byte_cached_string_; |
| 149 | |
| 150 | static bool EnsureCompiledIrregexp(Handle<JSRegExp> re, bool is_ascii); |
| 151 | |
| 152 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 153 | // Set the subject cache. The previous string buffer is not deleted, so the |
| 154 | // caller should ensure that it doesn't leak. |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 155 | static void SetSubjectCache(String* subject, |
| 156 | char* utf8_subject, |
| 157 | int uft8_length, |
| 158 | int character_position, |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 159 | int utf8_position); |
| 160 | |
| 161 | // A one element cache of the last utf8_subject string and its length. The |
| 162 | // subject JS String object is cached in the heap. We also cache a |
| 163 | // translation between position and utf8 position. |
| 164 | static char* utf8_subject_cache_; |
| 165 | static int utf8_length_cache_; |
| 166 | static int utf8_position_; |
| 167 | static int character_position_; |
| 168 | }; |
| 169 | |
| 170 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 171 | class CharacterRange { |
| 172 | public: |
| 173 | CharacterRange() : from_(0), to_(0) { } |
| 174 | // For compatibility with the CHECK_OK macro |
| 175 | CharacterRange(void* null) { ASSERT_EQ(NULL, null); } //NOLINT |
| 176 | CharacterRange(uc16 from, uc16 to) : from_(from), to_(to) { } |
| 177 | static void AddClassEscape(uc16 type, ZoneList<CharacterRange>* ranges); |
| 178 | static Vector<const uc16> GetWordBounds(); |
| 179 | static inline CharacterRange Singleton(uc16 value) { |
| 180 | return CharacterRange(value, value); |
| 181 | } |
| 182 | static inline CharacterRange Range(uc16 from, uc16 to) { |
| 183 | ASSERT(from <= to); |
| 184 | return CharacterRange(from, to); |
| 185 | } |
| 186 | static inline CharacterRange Everything() { |
| 187 | return CharacterRange(0, 0xFFFF); |
| 188 | } |
| 189 | bool Contains(uc16 i) { return from_ <= i && i <= to_; } |
| 190 | uc16 from() const { return from_; } |
| 191 | void set_from(uc16 value) { from_ = value; } |
| 192 | uc16 to() const { return to_; } |
| 193 | void set_to(uc16 value) { to_ = value; } |
| 194 | bool is_valid() { return from_ <= to_; } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 195 | bool IsEverything(uc16 max) { return from_ == 0 && to_ >= max; } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 196 | bool IsSingleton() { return (from_ == to_); } |
| 197 | void AddCaseEquivalents(ZoneList<CharacterRange>* ranges); |
| 198 | static void Split(ZoneList<CharacterRange>* base, |
| 199 | Vector<const uc16> overlay, |
| 200 | ZoneList<CharacterRange>** included, |
| 201 | ZoneList<CharacterRange>** excluded); |
| 202 | |
| 203 | static const int kRangeCanonicalizeMax = 0x346; |
| 204 | static const int kStartMarker = (1 << 24); |
| 205 | static const int kPayloadMask = (1 << 24) - 1; |
| 206 | |
| 207 | private: |
| 208 | uc16 from_; |
| 209 | uc16 to_; |
| 210 | }; |
| 211 | |
| 212 | |
| 213 | template <typename Node, class Callback> |
| 214 | static void DoForEach(Node* node, Callback* callback); |
| 215 | |
| 216 | |
| 217 | // A zone splay tree. The config type parameter encapsulates the |
| 218 | // different configurations of a concrete splay tree: |
| 219 | // |
| 220 | // typedef Key: the key type |
| 221 | // typedef Value: the value type |
| 222 | // static const kNoKey: the dummy key used when no key is set |
| 223 | // static const kNoValue: the dummy value used to initialize nodes |
| 224 | // int (Compare)(Key& a, Key& b) -> {-1, 0, 1}: comparison function |
| 225 | // |
| 226 | template <typename Config> |
| 227 | class ZoneSplayTree : public ZoneObject { |
| 228 | public: |
| 229 | typedef typename Config::Key Key; |
| 230 | typedef typename Config::Value Value; |
| 231 | |
| 232 | class Locator; |
| 233 | |
| 234 | ZoneSplayTree() : root_(NULL) { } |
| 235 | |
| 236 | // Inserts the given key in this tree with the given value. Returns |
| 237 | // true if a node was inserted, otherwise false. If found the locator |
| 238 | // is enabled and provides access to the mapping for the key. |
| 239 | bool Insert(const Key& key, Locator* locator); |
| 240 | |
| 241 | // Looks up the key in this tree and returns true if it was found, |
| 242 | // otherwise false. If the node is found the locator is enabled and |
| 243 | // provides access to the mapping for the key. |
| 244 | bool Find(const Key& key, Locator* locator); |
| 245 | |
| 246 | // Finds the mapping with the greatest key less than or equal to the |
| 247 | // given key. |
| 248 | bool FindGreatestLessThan(const Key& key, Locator* locator); |
| 249 | |
| 250 | // Find the mapping with the greatest key in this tree. |
| 251 | bool FindGreatest(Locator* locator); |
| 252 | |
| 253 | // Finds the mapping with the least key greater than or equal to the |
| 254 | // given key. |
| 255 | bool FindLeastGreaterThan(const Key& key, Locator* locator); |
| 256 | |
| 257 | // Find the mapping with the least key in this tree. |
| 258 | bool FindLeast(Locator* locator); |
| 259 | |
| 260 | // Remove the node with the given key from the tree. |
| 261 | bool Remove(const Key& key); |
| 262 | |
| 263 | bool is_empty() { return root_ == NULL; } |
| 264 | |
| 265 | // Perform the splay operation for the given key. Moves the node with |
| 266 | // the given key to the top of the tree. If no node has the given |
| 267 | // key, the last node on the search path is moved to the top of the |
| 268 | // tree. |
| 269 | void Splay(const Key& key); |
| 270 | |
| 271 | class Node : public ZoneObject { |
| 272 | public: |
| 273 | Node(const Key& key, const Value& value) |
| 274 | : key_(key), |
| 275 | value_(value), |
| 276 | left_(NULL), |
| 277 | right_(NULL) { } |
| 278 | Key key() { return key_; } |
| 279 | Value value() { return value_; } |
| 280 | Node* left() { return left_; } |
| 281 | Node* right() { return right_; } |
| 282 | private: |
| 283 | friend class ZoneSplayTree; |
| 284 | friend class Locator; |
| 285 | Key key_; |
| 286 | Value value_; |
| 287 | Node* left_; |
| 288 | Node* right_; |
| 289 | }; |
| 290 | |
| 291 | // A locator provides access to a node in the tree without actually |
| 292 | // exposing the node. |
| 293 | class Locator { |
| 294 | public: |
| 295 | explicit Locator(Node* node) : node_(node) { } |
| 296 | Locator() : node_(NULL) { } |
| 297 | const Key& key() { return node_->key_; } |
| 298 | Value& value() { return node_->value_; } |
| 299 | void set_value(const Value& value) { node_->value_ = value; } |
| 300 | inline void bind(Node* node) { node_ = node; } |
| 301 | private: |
| 302 | Node* node_; |
| 303 | }; |
| 304 | |
| 305 | template <class Callback> |
| 306 | void ForEach(Callback* c) { |
| 307 | DoForEach<typename ZoneSplayTree<Config>::Node, Callback>(root_, c); |
| 308 | } |
| 309 | |
| 310 | private: |
| 311 | Node* root_; |
| 312 | }; |
| 313 | |
| 314 | |
| 315 | // A set of unsigned integers that behaves especially well on small |
| 316 | // integers (< 32). May do zone-allocation. |
| 317 | class OutSet: public ZoneObject { |
| 318 | public: |
| 319 | OutSet() : first_(0), remaining_(NULL), successors_(NULL) { } |
| 320 | OutSet* Extend(unsigned value); |
| 321 | bool Get(unsigned value); |
| 322 | static const unsigned kFirstLimit = 32; |
| 323 | |
| 324 | private: |
| 325 | // Destructively set a value in this set. In most cases you want |
| 326 | // to use Extend instead to ensure that only one instance exists |
| 327 | // that contains the same values. |
| 328 | void Set(unsigned value); |
| 329 | |
| 330 | // The successors are a list of sets that contain the same values |
| 331 | // as this set and the one more value that is not present in this |
| 332 | // set. |
| 333 | ZoneList<OutSet*>* successors() { return successors_; } |
| 334 | |
| 335 | OutSet(uint32_t first, ZoneList<unsigned>* remaining) |
| 336 | : first_(first), remaining_(remaining), successors_(NULL) { } |
| 337 | uint32_t first_; |
| 338 | ZoneList<unsigned>* remaining_; |
| 339 | ZoneList<OutSet*>* successors_; |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 340 | friend class Trace; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 341 | }; |
| 342 | |
| 343 | |
| 344 | // A mapping from integers, specified as ranges, to a set of integers. |
| 345 | // Used for mapping character ranges to choices. |
| 346 | class DispatchTable : public ZoneObject { |
| 347 | public: |
| 348 | class Entry { |
| 349 | public: |
| 350 | Entry() : from_(0), to_(0), out_set_(NULL) { } |
| 351 | Entry(uc16 from, uc16 to, OutSet* out_set) |
| 352 | : from_(from), to_(to), out_set_(out_set) { } |
| 353 | uc16 from() { return from_; } |
| 354 | uc16 to() { return to_; } |
| 355 | void set_to(uc16 value) { to_ = value; } |
| 356 | void AddValue(int value) { out_set_ = out_set_->Extend(value); } |
| 357 | OutSet* out_set() { return out_set_; } |
| 358 | private: |
| 359 | uc16 from_; |
| 360 | uc16 to_; |
| 361 | OutSet* out_set_; |
| 362 | }; |
| 363 | |
| 364 | class Config { |
| 365 | public: |
| 366 | typedef uc16 Key; |
| 367 | typedef Entry Value; |
| 368 | static const uc16 kNoKey; |
| 369 | static const Entry kNoValue; |
| 370 | static inline int Compare(uc16 a, uc16 b) { |
| 371 | if (a == b) |
| 372 | return 0; |
| 373 | else if (a < b) |
| 374 | return -1; |
| 375 | else |
| 376 | return 1; |
| 377 | } |
| 378 | }; |
| 379 | |
| 380 | void AddRange(CharacterRange range, int value); |
| 381 | OutSet* Get(uc16 value); |
| 382 | void Dump(); |
| 383 | |
| 384 | template <typename Callback> |
| 385 | void ForEach(Callback* callback) { return tree()->ForEach(callback); } |
| 386 | private: |
| 387 | // There can't be a static empty set since it allocates its |
| 388 | // successors in a zone and caches them. |
| 389 | OutSet* empty() { return &empty_; } |
| 390 | OutSet empty_; |
| 391 | ZoneSplayTree<Config>* tree() { return &tree_; } |
| 392 | ZoneSplayTree<Config> tree_; |
| 393 | }; |
| 394 | |
| 395 | |
| 396 | #define FOR_EACH_NODE_TYPE(VISIT) \ |
| 397 | VISIT(End) \ |
| 398 | VISIT(Action) \ |
| 399 | VISIT(Choice) \ |
| 400 | VISIT(BackReference) \ |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 401 | VISIT(Assertion) \ |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 402 | VISIT(Text) |
| 403 | |
| 404 | |
| 405 | #define FOR_EACH_REG_EXP_TREE_TYPE(VISIT) \ |
| 406 | VISIT(Disjunction) \ |
| 407 | VISIT(Alternative) \ |
| 408 | VISIT(Assertion) \ |
| 409 | VISIT(CharacterClass) \ |
| 410 | VISIT(Atom) \ |
| 411 | VISIT(Quantifier) \ |
| 412 | VISIT(Capture) \ |
| 413 | VISIT(Lookahead) \ |
| 414 | VISIT(BackReference) \ |
| 415 | VISIT(Empty) \ |
| 416 | VISIT(Text) |
| 417 | |
| 418 | |
| 419 | #define FORWARD_DECLARE(Name) class RegExp##Name; |
| 420 | FOR_EACH_REG_EXP_TREE_TYPE(FORWARD_DECLARE) |
| 421 | #undef FORWARD_DECLARE |
| 422 | |
| 423 | |
| 424 | class TextElement { |
| 425 | public: |
| 426 | enum Type {UNINITIALIZED, ATOM, CHAR_CLASS}; |
| 427 | TextElement() : type(UNINITIALIZED) { } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 428 | explicit TextElement(Type t) : type(t), cp_offset(-1) { } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 429 | static TextElement Atom(RegExpAtom* atom); |
| 430 | static TextElement CharClass(RegExpCharacterClass* char_class); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 431 | int length(); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 432 | Type type; |
| 433 | union { |
| 434 | RegExpAtom* u_atom; |
| 435 | RegExpCharacterClass* u_char_class; |
| 436 | } data; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 437 | int cp_offset; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 438 | }; |
| 439 | |
| 440 | |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 441 | class Trace; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 442 | |
| 443 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 444 | struct NodeInfo { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 445 | NodeInfo() |
| 446 | : being_analyzed(false), |
| 447 | been_analyzed(false), |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 448 | follows_word_interest(false), |
| 449 | follows_newline_interest(false), |
| 450 | follows_start_interest(false), |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 451 | at_end(false), |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 452 | visited(false) { } |
| 453 | |
| 454 | // Returns true if the interests and assumptions of this node |
| 455 | // matches the given one. |
| 456 | bool Matches(NodeInfo* that) { |
| 457 | return (at_end == that->at_end) && |
| 458 | (follows_word_interest == that->follows_word_interest) && |
| 459 | (follows_newline_interest == that->follows_newline_interest) && |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 460 | (follows_start_interest == that->follows_start_interest); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 461 | } |
| 462 | |
| 463 | // Updates the interests of this node given the interests of the |
| 464 | // node preceding it. |
| 465 | void AddFromPreceding(NodeInfo* that) { |
| 466 | at_end |= that->at_end; |
| 467 | follows_word_interest |= that->follows_word_interest; |
| 468 | follows_newline_interest |= that->follows_newline_interest; |
| 469 | follows_start_interest |= that->follows_start_interest; |
| 470 | } |
| 471 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 472 | bool HasLookbehind() { |
| 473 | return follows_word_interest || |
| 474 | follows_newline_interest || |
| 475 | follows_start_interest; |
| 476 | } |
| 477 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 478 | // Sets the interests of this node to include the interests of the |
| 479 | // following node. |
| 480 | void AddFromFollowing(NodeInfo* that) { |
| 481 | follows_word_interest |= that->follows_word_interest; |
| 482 | follows_newline_interest |= that->follows_newline_interest; |
| 483 | follows_start_interest |= that->follows_start_interest; |
| 484 | } |
| 485 | |
| 486 | void ResetCompilationState() { |
| 487 | being_analyzed = false; |
| 488 | been_analyzed = false; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 489 | } |
| 490 | |
| 491 | bool being_analyzed: 1; |
| 492 | bool been_analyzed: 1; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 493 | |
| 494 | // These bits are set of this node has to know what the preceding |
| 495 | // character was. |
| 496 | bool follows_word_interest: 1; |
| 497 | bool follows_newline_interest: 1; |
| 498 | bool follows_start_interest: 1; |
| 499 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 500 | bool at_end: 1; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 501 | bool visited: 1; |
| 502 | }; |
| 503 | |
| 504 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 505 | class SiblingList { |
| 506 | public: |
| 507 | SiblingList() : list_(NULL) { } |
| 508 | int length() { |
| 509 | return list_ == NULL ? 0 : list_->length(); |
| 510 | } |
| 511 | void Ensure(RegExpNode* parent) { |
| 512 | if (list_ == NULL) { |
| 513 | list_ = new ZoneList<RegExpNode*>(2); |
| 514 | list_->Add(parent); |
| 515 | } |
| 516 | } |
| 517 | void Add(RegExpNode* node) { list_->Add(node); } |
| 518 | RegExpNode* Get(int index) { return list_->at(index); } |
| 519 | private: |
| 520 | ZoneList<RegExpNode*>* list_; |
| 521 | }; |
| 522 | |
| 523 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 524 | // Details of a quick mask-compare check that can look ahead in the |
| 525 | // input stream. |
| 526 | class QuickCheckDetails { |
| 527 | public: |
| 528 | QuickCheckDetails() |
| 529 | : characters_(0), |
| 530 | mask_(0), |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 531 | value_(0), |
| 532 | cannot_match_(false) { } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 533 | explicit QuickCheckDetails(int characters) |
| 534 | : characters_(characters), |
| 535 | mask_(0), |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 536 | value_(0), |
| 537 | cannot_match_(false) { } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 538 | bool Rationalize(bool ascii); |
| 539 | // Merge in the information from another branch of an alternation. |
| 540 | void Merge(QuickCheckDetails* other, int from_index); |
| 541 | // Advance the current position by some amount. |
| 542 | void Advance(int by, bool ascii); |
| 543 | void Clear(); |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 544 | bool cannot_match() { return cannot_match_; } |
| 545 | void set_cannot_match() { cannot_match_ = true; } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 546 | struct Position { |
| 547 | Position() : mask(0), value(0), determines_perfectly(false) { } |
| 548 | uc16 mask; |
| 549 | uc16 value; |
| 550 | bool determines_perfectly; |
| 551 | }; |
| 552 | int characters() { return characters_; } |
| 553 | void set_characters(int characters) { characters_ = characters; } |
| 554 | Position* positions(int index) { |
| 555 | ASSERT(index >= 0); |
| 556 | ASSERT(index < characters_); |
| 557 | return positions_ + index; |
| 558 | } |
| 559 | uint32_t mask() { return mask_; } |
| 560 | uint32_t value() { return value_; } |
| 561 | |
| 562 | private: |
| 563 | // How many characters do we have quick check information from. This is |
| 564 | // the same for all branches of a choice node. |
| 565 | int characters_; |
| 566 | Position positions_[4]; |
| 567 | // These values are the condensate of the above array after Rationalize(). |
| 568 | uint32_t mask_; |
| 569 | uint32_t value_; |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 570 | // If set to true, there is no way this quick check can match at all. |
| 571 | // E.g., if it requires to be at the start of the input, and isn't. |
| 572 | bool cannot_match_; |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 573 | }; |
| 574 | |
| 575 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 576 | class RegExpNode: public ZoneObject { |
| 577 | public: |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 578 | RegExpNode() : trace_count_(0) { } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 579 | virtual ~RegExpNode(); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 580 | virtual void Accept(NodeVisitor* visitor) = 0; |
| 581 | // Generates a goto to this node or actually generates the code at this point. |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 582 | virtual void Emit(RegExpCompiler* compiler, Trace* trace) = 0; |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 583 | // How many characters must this node consume at a minimum in order to |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 584 | // succeed. If we have found at least 'still_to_find' characters that |
| 585 | // must be consumed there is no need to ask any following nodes whether |
| 586 | // they are sure to eat any more characters. |
| 587 | virtual int EatsAtLeast(int still_to_find, int recursion_depth) = 0; |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 588 | // Emits some quick code that checks whether the preloaded characters match. |
| 589 | // Falls through on certain failure, jumps to the label on possible success. |
| 590 | // If the node cannot make a quick check it does nothing and returns false. |
| 591 | bool EmitQuickCheck(RegExpCompiler* compiler, |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 592 | Trace* trace, |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 593 | bool preload_has_checked_bounds, |
| 594 | Label* on_possible_success, |
| 595 | QuickCheckDetails* details_return, |
| 596 | bool fall_through_on_failure); |
| 597 | // For a given number of characters this returns a mask and a value. The |
| 598 | // next n characters are anded with the mask and compared with the value. |
| 599 | // A comparison failure indicates the node cannot match the next n characters. |
| 600 | // A comparison success indicates the node may match. |
| 601 | virtual void GetQuickCheckDetails(QuickCheckDetails* details, |
| 602 | RegExpCompiler* compiler, |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 603 | int characters_filled_in, |
| 604 | bool not_at_start) = 0; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 605 | static const int kNodeIsTooComplexForGreedyLoops = -1; |
| 606 | virtual int GreedyLoopTextLength() { return kNodeIsTooComplexForGreedyLoops; } |
| 607 | Label* label() { return &label_; } |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 608 | // If non-generic code is generated for a node (ie the node is not at the |
| 609 | // start of the trace) then it cannot be reused. This variable sets a limit |
| 610 | // on how often we allow that to happen before we insist on starting a new |
| 611 | // trace and generating generic code for a node that can be reused by flushing |
| 612 | // the deferred actions in the current trace and generating a goto. |
| 613 | static const int kMaxCopiesCodeGenerated = 10; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 614 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 615 | NodeInfo* info() { return &info_; } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 616 | |
| 617 | void AddSibling(RegExpNode* node) { siblings_.Add(node); } |
| 618 | |
| 619 | // Static version of EnsureSibling that expresses the fact that the |
| 620 | // result has the same type as the input. |
| 621 | template <class C> |
| 622 | static C* EnsureSibling(C* node, NodeInfo* info, bool* cloned) { |
| 623 | return static_cast<C*>(node->EnsureSibling(info, cloned)); |
| 624 | } |
| 625 | |
| 626 | SiblingList* siblings() { return &siblings_; } |
| 627 | void set_siblings(SiblingList* other) { siblings_ = *other; } |
| 628 | |
| 629 | protected: |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 630 | enum LimitResult { DONE, CONTINUE }; |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 631 | LimitResult LimitVersions(RegExpCompiler* compiler, Trace* trace); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 632 | |
| 633 | // Returns a sibling of this node whose interests and assumptions |
| 634 | // match the ones in the given node info. If no sibling exists NULL |
| 635 | // is returned. |
| 636 | RegExpNode* TryGetSibling(NodeInfo* info); |
| 637 | |
| 638 | // Returns a sibling of this node whose interests match the ones in |
| 639 | // the given node info. The info must not contain any assertions. |
| 640 | // If no node exists a new one will be created by cloning the current |
| 641 | // node. The result will always be an instance of the same concrete |
| 642 | // class as this node. |
| 643 | RegExpNode* EnsureSibling(NodeInfo* info, bool* cloned); |
| 644 | |
| 645 | // Returns a clone of this node initialized using the copy constructor |
| 646 | // of its concrete class. Note that the node may have to be pre- |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 647 | // processed before it is on a usable state. |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 648 | virtual RegExpNode* Clone() = 0; |
| 649 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 650 | private: |
| 651 | Label label_; |
| 652 | NodeInfo info_; |
| 653 | SiblingList siblings_; |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 654 | // This variable keeps track of how many times code has been generated for |
| 655 | // this node (in different traces). We don't keep track of where the |
| 656 | // generated code is located unless the code is generated at the start of |
| 657 | // a trace, in which case it is generic and can be reused by flushing the |
| 658 | // deferred operations in the current trace and generating a goto. |
| 659 | int trace_count_; |
| 660 | }; |
| 661 | |
| 662 | |
| 663 | // A simple closed interval. |
| 664 | class Interval { |
| 665 | public: |
| 666 | Interval() : from_(kNone), to_(kNone) { } |
| 667 | Interval(int from, int to) : from_(from), to_(to) { } |
| 668 | Interval Union(Interval that) { |
| 669 | if (that.from_ == kNone) |
| 670 | return *this; |
| 671 | else if (from_ == kNone) |
| 672 | return that; |
| 673 | else |
| 674 | return Interval(Min(from_, that.from_), Max(to_, that.to_)); |
| 675 | } |
| 676 | bool Contains(int value) { |
| 677 | return (from_ <= value) && (value <= to_); |
| 678 | } |
| 679 | bool is_empty() { return from_ == kNone; } |
| 680 | int from() { return from_; } |
| 681 | int to() { return to_; } |
| 682 | static Interval Empty() { return Interval(); } |
| 683 | static const int kNone = -1; |
| 684 | private: |
| 685 | int from_; |
| 686 | int to_; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 687 | }; |
| 688 | |
| 689 | |
| 690 | class SeqRegExpNode: public RegExpNode { |
| 691 | public: |
| 692 | explicit SeqRegExpNode(RegExpNode* on_success) |
| 693 | : on_success_(on_success) { } |
| 694 | RegExpNode* on_success() { return on_success_; } |
| 695 | void set_on_success(RegExpNode* node) { on_success_ = node; } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 696 | private: |
| 697 | RegExpNode* on_success_; |
| 698 | }; |
| 699 | |
| 700 | |
| 701 | class ActionNode: public SeqRegExpNode { |
| 702 | public: |
| 703 | enum Type { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 704 | SET_REGISTER, |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 705 | INCREMENT_REGISTER, |
| 706 | STORE_POSITION, |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 707 | BEGIN_SUBMATCH, |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 708 | POSITIVE_SUBMATCH_SUCCESS, |
| 709 | EMPTY_MATCH_CHECK, |
| 710 | CLEAR_CAPTURES |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 711 | }; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 712 | static ActionNode* SetRegister(int reg, int val, RegExpNode* on_success); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 713 | static ActionNode* IncrementRegister(int reg, RegExpNode* on_success); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 714 | static ActionNode* StorePosition(int reg, |
| 715 | bool is_capture, |
| 716 | RegExpNode* on_success); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 717 | static ActionNode* ClearCaptures(Interval range, RegExpNode* on_success); |
| 718 | static ActionNode* BeginSubmatch(int stack_pointer_reg, |
| 719 | int position_reg, |
| 720 | RegExpNode* on_success); |
| 721 | static ActionNode* PositiveSubmatchSuccess(int stack_pointer_reg, |
| 722 | int restore_reg, |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 723 | int clear_capture_count, |
| 724 | int clear_capture_from, |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 725 | RegExpNode* on_success); |
| 726 | static ActionNode* EmptyMatchCheck(int start_register, |
| 727 | int repetition_register, |
| 728 | int repetition_limit, |
| 729 | RegExpNode* on_success); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 730 | virtual void Accept(NodeVisitor* visitor); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 731 | virtual void Emit(RegExpCompiler* compiler, Trace* trace); |
| 732 | virtual int EatsAtLeast(int still_to_find, int recursion_depth); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 733 | virtual void GetQuickCheckDetails(QuickCheckDetails* details, |
| 734 | RegExpCompiler* compiler, |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 735 | int filled_in, |
| 736 | bool not_at_start) { |
| 737 | return on_success()->GetQuickCheckDetails( |
| 738 | details, compiler, filled_in, not_at_start); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 739 | } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 740 | Type type() { return type_; } |
| 741 | // TODO(erikcorry): We should allow some action nodes in greedy loops. |
| 742 | virtual int GreedyLoopTextLength() { return kNodeIsTooComplexForGreedyLoops; } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 743 | virtual ActionNode* Clone() { return new ActionNode(*this); } |
| 744 | |
| 745 | private: |
| 746 | union { |
| 747 | struct { |
| 748 | int reg; |
| 749 | int value; |
| 750 | } u_store_register; |
| 751 | struct { |
| 752 | int reg; |
| 753 | } u_increment_register; |
| 754 | struct { |
| 755 | int reg; |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 756 | bool is_capture; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 757 | } u_position_register; |
| 758 | struct { |
| 759 | int stack_pointer_register; |
| 760 | int current_position_register; |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 761 | int clear_register_count; |
| 762 | int clear_register_from; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 763 | } u_submatch; |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 764 | struct { |
| 765 | int start_register; |
| 766 | int repetition_register; |
| 767 | int repetition_limit; |
| 768 | } u_empty_match_check; |
| 769 | struct { |
| 770 | int range_from; |
| 771 | int range_to; |
| 772 | } u_clear_captures; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 773 | } data_; |
| 774 | ActionNode(Type type, RegExpNode* on_success) |
| 775 | : SeqRegExpNode(on_success), |
| 776 | type_(type) { } |
| 777 | Type type_; |
| 778 | friend class DotPrinter; |
| 779 | }; |
| 780 | |
| 781 | |
| 782 | class TextNode: public SeqRegExpNode { |
| 783 | public: |
| 784 | TextNode(ZoneList<TextElement>* elms, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 785 | RegExpNode* on_success) |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 786 | : SeqRegExpNode(on_success), |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 787 | elms_(elms) { } |
| 788 | TextNode(RegExpCharacterClass* that, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 789 | RegExpNode* on_success) |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 790 | : SeqRegExpNode(on_success), |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 791 | elms_(new ZoneList<TextElement>(1)) { |
| 792 | elms_->Add(TextElement::CharClass(that)); |
| 793 | } |
| 794 | virtual void Accept(NodeVisitor* visitor); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 795 | virtual void Emit(RegExpCompiler* compiler, Trace* trace); |
| 796 | virtual int EatsAtLeast(int still_to_find, int recursion_depth); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 797 | virtual void GetQuickCheckDetails(QuickCheckDetails* details, |
| 798 | RegExpCompiler* compiler, |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 799 | int characters_filled_in, |
| 800 | bool not_at_start); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 801 | ZoneList<TextElement>* elements() { return elms_; } |
| 802 | void MakeCaseIndependent(); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 803 | virtual int GreedyLoopTextLength(); |
| 804 | virtual TextNode* Clone() { |
| 805 | TextNode* result = new TextNode(*this); |
| 806 | result->CalculateOffsets(); |
| 807 | return result; |
| 808 | } |
| 809 | void CalculateOffsets(); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 810 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 811 | private: |
| 812 | enum TextEmitPassType { |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 813 | NON_ASCII_MATCH, // Check for characters that can't match. |
| 814 | SIMPLE_CHARACTER_MATCH, // Case-dependent single character check. |
| 815 | NON_LETTER_CHARACTER_MATCH, // Check characters that have no case equivs. |
| 816 | CASE_CHARACTER_MATCH, // Case-independent single character check. |
| 817 | CHARACTER_CLASS_MATCH // Character class. |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 818 | }; |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 819 | static bool SkipPass(int pass, bool ignore_case); |
| 820 | static const int kFirstRealPass = SIMPLE_CHARACTER_MATCH; |
| 821 | static const int kLastPass = CHARACTER_CLASS_MATCH; |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 822 | void TextEmitPass(RegExpCompiler* compiler, |
| 823 | TextEmitPassType pass, |
| 824 | bool preloaded, |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 825 | Trace* trace, |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 826 | bool first_element_checked, |
| 827 | int* checked_up_to); |
| 828 | int Length(); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 829 | ZoneList<TextElement>* elms_; |
| 830 | }; |
| 831 | |
| 832 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 833 | class AssertionNode: public SeqRegExpNode { |
| 834 | public: |
| 835 | enum AssertionNodeType { |
| 836 | AT_END, |
| 837 | AT_START, |
| 838 | AT_BOUNDARY, |
| 839 | AT_NON_BOUNDARY, |
| 840 | AFTER_NEWLINE |
| 841 | }; |
| 842 | static AssertionNode* AtEnd(RegExpNode* on_success) { |
| 843 | return new AssertionNode(AT_END, on_success); |
| 844 | } |
| 845 | static AssertionNode* AtStart(RegExpNode* on_success) { |
| 846 | return new AssertionNode(AT_START, on_success); |
| 847 | } |
| 848 | static AssertionNode* AtBoundary(RegExpNode* on_success) { |
| 849 | return new AssertionNode(AT_BOUNDARY, on_success); |
| 850 | } |
| 851 | static AssertionNode* AtNonBoundary(RegExpNode* on_success) { |
| 852 | return new AssertionNode(AT_NON_BOUNDARY, on_success); |
| 853 | } |
| 854 | static AssertionNode* AfterNewline(RegExpNode* on_success) { |
| 855 | return new AssertionNode(AFTER_NEWLINE, on_success); |
| 856 | } |
| 857 | virtual void Accept(NodeVisitor* visitor); |
| 858 | virtual void Emit(RegExpCompiler* compiler, Trace* trace); |
| 859 | virtual int EatsAtLeast(int still_to_find, int recursion_depth); |
| 860 | virtual void GetQuickCheckDetails(QuickCheckDetails* details, |
| 861 | RegExpCompiler* compiler, |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 862 | int filled_in, |
| 863 | bool not_at_start); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 864 | virtual AssertionNode* Clone() { return new AssertionNode(*this); } |
| 865 | AssertionNodeType type() { return type_; } |
| 866 | private: |
| 867 | AssertionNode(AssertionNodeType t, RegExpNode* on_success) |
| 868 | : SeqRegExpNode(on_success), type_(t) { } |
| 869 | AssertionNodeType type_; |
| 870 | }; |
| 871 | |
| 872 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 873 | class BackReferenceNode: public SeqRegExpNode { |
| 874 | public: |
| 875 | BackReferenceNode(int start_reg, |
| 876 | int end_reg, |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 877 | RegExpNode* on_success) |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 878 | : SeqRegExpNode(on_success), |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 879 | start_reg_(start_reg), |
| 880 | end_reg_(end_reg) { } |
| 881 | virtual void Accept(NodeVisitor* visitor); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 882 | int start_register() { return start_reg_; } |
| 883 | int end_register() { return end_reg_; } |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 884 | virtual void Emit(RegExpCompiler* compiler, Trace* trace); |
| 885 | virtual int EatsAtLeast(int still_to_find, int recursion_depth); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 886 | virtual void GetQuickCheckDetails(QuickCheckDetails* details, |
| 887 | RegExpCompiler* compiler, |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 888 | int characters_filled_in, |
| 889 | bool not_at_start) { |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 890 | return; |
| 891 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 892 | virtual BackReferenceNode* Clone() { return new BackReferenceNode(*this); } |
| 893 | |
| 894 | private: |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 895 | int start_reg_; |
| 896 | int end_reg_; |
| 897 | }; |
| 898 | |
| 899 | |
| 900 | class EndNode: public RegExpNode { |
| 901 | public: |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 902 | enum Action { ACCEPT, BACKTRACK, NEGATIVE_SUBMATCH_SUCCESS }; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 903 | explicit EndNode(Action action) : action_(action) { } |
| 904 | virtual void Accept(NodeVisitor* visitor); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 905 | virtual void Emit(RegExpCompiler* compiler, Trace* trace); |
| 906 | virtual int EatsAtLeast(int still_to_find, int recursion_depth) { return 0; } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 907 | virtual void GetQuickCheckDetails(QuickCheckDetails* details, |
| 908 | RegExpCompiler* compiler, |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 909 | int characters_filled_in, |
| 910 | bool not_at_start) { |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 911 | // Returning 0 from EatsAtLeast should ensure we never get here. |
| 912 | UNREACHABLE(); |
| 913 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 914 | virtual EndNode* Clone() { return new EndNode(*this); } |
| 915 | |
| 916 | private: |
| 917 | Action action_; |
| 918 | }; |
| 919 | |
| 920 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 921 | class NegativeSubmatchSuccess: public EndNode { |
| 922 | public: |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 923 | NegativeSubmatchSuccess(int stack_pointer_reg, |
| 924 | int position_reg, |
| 925 | int clear_capture_count, |
| 926 | int clear_capture_start) |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 927 | : EndNode(NEGATIVE_SUBMATCH_SUCCESS), |
| 928 | stack_pointer_register_(stack_pointer_reg), |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 929 | current_position_register_(position_reg), |
| 930 | clear_capture_count_(clear_capture_count), |
| 931 | clear_capture_start_(clear_capture_start) { } |
| 932 | virtual void Emit(RegExpCompiler* compiler, Trace* trace); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 933 | |
| 934 | private: |
| 935 | int stack_pointer_register_; |
| 936 | int current_position_register_; |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 937 | int clear_capture_count_; |
| 938 | int clear_capture_start_; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 939 | }; |
| 940 | |
| 941 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 942 | class Guard: public ZoneObject { |
| 943 | public: |
| 944 | enum Relation { LT, GEQ }; |
| 945 | Guard(int reg, Relation op, int value) |
| 946 | : reg_(reg), |
| 947 | op_(op), |
| 948 | value_(value) { } |
| 949 | int reg() { return reg_; } |
| 950 | Relation op() { return op_; } |
| 951 | int value() { return value_; } |
| 952 | |
| 953 | private: |
| 954 | int reg_; |
| 955 | Relation op_; |
| 956 | int value_; |
| 957 | }; |
| 958 | |
| 959 | |
| 960 | class GuardedAlternative { |
| 961 | public: |
| 962 | explicit GuardedAlternative(RegExpNode* node) : node_(node), guards_(NULL) { } |
| 963 | void AddGuard(Guard* guard); |
| 964 | RegExpNode* node() { return node_; } |
| 965 | void set_node(RegExpNode* node) { node_ = node; } |
| 966 | ZoneList<Guard*>* guards() { return guards_; } |
| 967 | |
| 968 | private: |
| 969 | RegExpNode* node_; |
| 970 | ZoneList<Guard*>* guards_; |
| 971 | }; |
| 972 | |
| 973 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 974 | class AlternativeGeneration; |
| 975 | |
| 976 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 977 | class ChoiceNode: public RegExpNode { |
| 978 | public: |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 979 | explicit ChoiceNode(int expected_size) |
| 980 | : alternatives_(new ZoneList<GuardedAlternative>(expected_size)), |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 981 | table_(NULL), |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 982 | not_at_start_(false), |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 983 | being_calculated_(false) { } |
| 984 | virtual void Accept(NodeVisitor* visitor); |
| 985 | void AddAlternative(GuardedAlternative node) { alternatives()->Add(node); } |
| 986 | ZoneList<GuardedAlternative>* alternatives() { return alternatives_; } |
| 987 | DispatchTable* GetTable(bool ignore_case); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 988 | virtual void Emit(RegExpCompiler* compiler, Trace* trace); |
| 989 | virtual int EatsAtLeast(int still_to_find, int recursion_depth); |
| 990 | int EatsAtLeastHelper(int still_to_find, |
| 991 | int recursion_depth, |
| 992 | RegExpNode* ignore_this_node); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 993 | virtual void GetQuickCheckDetails(QuickCheckDetails* details, |
| 994 | RegExpCompiler* compiler, |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 995 | int characters_filled_in, |
| 996 | bool not_at_start); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 997 | virtual ChoiceNode* Clone() { return new ChoiceNode(*this); } |
| 998 | |
| 999 | bool being_calculated() { return being_calculated_; } |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 1000 | bool not_at_start() { return not_at_start_; } |
| 1001 | void set_not_at_start() { not_at_start_ = true; } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1002 | void set_being_calculated(bool b) { being_calculated_ = b; } |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1003 | virtual bool try_to_emit_quick_check_for_alternative(int i) { return true; } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1004 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1005 | protected: |
ager@chromium.org | 5ec4892 | 2009-05-05 07:25:34 +0000 | [diff] [blame] | 1006 | int GreedyLoopTextLength(GuardedAlternative* alternative); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1007 | ZoneList<GuardedAlternative>* alternatives_; |
| 1008 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1009 | private: |
| 1010 | friend class DispatchTableConstructor; |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1011 | friend class Analysis; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1012 | void GenerateGuard(RegExpMacroAssembler* macro_assembler, |
ager@chromium.org | 5ec4892 | 2009-05-05 07:25:34 +0000 | [diff] [blame] | 1013 | Guard* guard, |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1014 | Trace* trace); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1015 | int CalculatePreloadCharacters(RegExpCompiler* compiler); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1016 | void EmitOutOfLineContinuation(RegExpCompiler* compiler, |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1017 | Trace* trace, |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1018 | GuardedAlternative alternative, |
| 1019 | AlternativeGeneration* alt_gen, |
| 1020 | int preload_characters, |
| 1021 | bool next_expects_preload); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1022 | DispatchTable* table_; |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 1023 | // If true, this node is never checked at the start of the input. |
| 1024 | // Allows a new trace to start with at_start() set to false. |
| 1025 | bool not_at_start_; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1026 | bool being_calculated_; |
| 1027 | }; |
| 1028 | |
| 1029 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1030 | class NegativeLookaheadChoiceNode: public ChoiceNode { |
| 1031 | public: |
| 1032 | explicit NegativeLookaheadChoiceNode(GuardedAlternative this_must_fail, |
| 1033 | GuardedAlternative then_do_this) |
| 1034 | : ChoiceNode(2) { |
| 1035 | AddAlternative(this_must_fail); |
| 1036 | AddAlternative(then_do_this); |
| 1037 | } |
| 1038 | virtual int EatsAtLeast(int still_to_find, int recursion_depth); |
| 1039 | virtual void GetQuickCheckDetails(QuickCheckDetails* details, |
| 1040 | RegExpCompiler* compiler, |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 1041 | int characters_filled_in, |
| 1042 | bool not_at_start); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1043 | // For a negative lookahead we don't emit the quick check for the |
| 1044 | // alternative that is expected to fail. This is because quick check code |
| 1045 | // starts by loading enough characters for the alternative that takes fewest |
| 1046 | // characters, but on a negative lookahead the negative branch did not take |
| 1047 | // part in that calculation (EatsAtLeast) so the assumptions don't hold. |
| 1048 | virtual bool try_to_emit_quick_check_for_alternative(int i) { return i != 0; } |
| 1049 | }; |
| 1050 | |
| 1051 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1052 | class LoopChoiceNode: public ChoiceNode { |
| 1053 | public: |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1054 | explicit LoopChoiceNode(bool body_can_be_zero_length) |
| 1055 | : ChoiceNode(2), |
| 1056 | loop_node_(NULL), |
| 1057 | continue_node_(NULL), |
| 1058 | body_can_be_zero_length_(body_can_be_zero_length) { } |
| 1059 | void AddLoopAlternative(GuardedAlternative alt); |
| 1060 | void AddContinueAlternative(GuardedAlternative alt); |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1061 | virtual void Emit(RegExpCompiler* compiler, Trace* trace); |
| 1062 | virtual int EatsAtLeast(int still_to_find, int recursion_depth); |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1063 | virtual void GetQuickCheckDetails(QuickCheckDetails* details, |
| 1064 | RegExpCompiler* compiler, |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 1065 | int characters_filled_in, |
| 1066 | bool not_at_start); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1067 | virtual LoopChoiceNode* Clone() { return new LoopChoiceNode(*this); } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1068 | RegExpNode* loop_node() { return loop_node_; } |
| 1069 | RegExpNode* continue_node() { return continue_node_; } |
| 1070 | bool body_can_be_zero_length() { return body_can_be_zero_length_; } |
| 1071 | virtual void Accept(NodeVisitor* visitor); |
| 1072 | |
| 1073 | private: |
| 1074 | // AddAlternative is made private for loop nodes because alternatives |
| 1075 | // should not be added freely, we need to keep track of which node |
| 1076 | // goes back to the node itself. |
| 1077 | void AddAlternative(GuardedAlternative node) { |
| 1078 | ChoiceNode::AddAlternative(node); |
| 1079 | } |
| 1080 | |
| 1081 | RegExpNode* loop_node_; |
| 1082 | RegExpNode* continue_node_; |
| 1083 | bool body_can_be_zero_length_; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1084 | }; |
| 1085 | |
| 1086 | |
| 1087 | // There are many ways to generate code for a node. This class encapsulates |
| 1088 | // the current way we should be generating. In other words it encapsulates |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1089 | // the current state of the code generator. The effect of this is that we |
| 1090 | // generate code for paths that the matcher can take through the regular |
| 1091 | // expression. A given node in the regexp can be code-generated several times |
| 1092 | // as it can be part of several traces. For example for the regexp: |
| 1093 | // /foo(bar|ip)baz/ the code to match baz will be generated twice, once as part |
| 1094 | // of the foo-bar-baz trace and once as part of the foo-ip-baz trace. The code |
| 1095 | // to match foo is generated only once (the traces have a common prefix). The |
| 1096 | // code to store the capture is deferred and generated (twice) after the places |
| 1097 | // where baz has been matched. |
| 1098 | class Trace { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1099 | public: |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 1100 | // A value for a property that is either known to be true, know to be false, |
| 1101 | // or not known. |
| 1102 | enum TriBool { |
| 1103 | UNKNOWN = -1, FALSE = 0, TRUE = 1 |
| 1104 | }; |
| 1105 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1106 | class DeferredAction { |
| 1107 | public: |
| 1108 | DeferredAction(ActionNode::Type type, int reg) |
| 1109 | : type_(type), reg_(reg), next_(NULL) { } |
| 1110 | DeferredAction* next() { return next_; } |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1111 | bool Mentions(int reg); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1112 | int reg() { return reg_; } |
| 1113 | ActionNode::Type type() { return type_; } |
| 1114 | private: |
| 1115 | ActionNode::Type type_; |
| 1116 | int reg_; |
| 1117 | DeferredAction* next_; |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1118 | friend class Trace; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1119 | }; |
| 1120 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1121 | class DeferredCapture : public DeferredAction { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1122 | public: |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1123 | DeferredCapture(int reg, bool is_capture, Trace* trace) |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1124 | : DeferredAction(ActionNode::STORE_POSITION, reg), |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1125 | cp_offset_(trace->cp_offset()), |
| 1126 | is_capture_(is_capture) { } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1127 | int cp_offset() { return cp_offset_; } |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1128 | bool is_capture() { return is_capture_; } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1129 | private: |
| 1130 | int cp_offset_; |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1131 | bool is_capture_; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1132 | void set_cp_offset(int cp_offset) { cp_offset_ = cp_offset; } |
| 1133 | }; |
| 1134 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1135 | class DeferredSetRegister : public DeferredAction { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1136 | public: |
| 1137 | DeferredSetRegister(int reg, int value) |
| 1138 | : DeferredAction(ActionNode::SET_REGISTER, reg), |
| 1139 | value_(value) { } |
| 1140 | int value() { return value_; } |
| 1141 | private: |
| 1142 | int value_; |
| 1143 | }; |
| 1144 | |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1145 | class DeferredClearCaptures : public DeferredAction { |
| 1146 | public: |
| 1147 | explicit DeferredClearCaptures(Interval range) |
| 1148 | : DeferredAction(ActionNode::CLEAR_CAPTURES, -1), |
| 1149 | range_(range) { } |
| 1150 | Interval range() { return range_; } |
| 1151 | private: |
| 1152 | Interval range_; |
| 1153 | }; |
| 1154 | |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1155 | class DeferredIncrementRegister : public DeferredAction { |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1156 | public: |
| 1157 | explicit DeferredIncrementRegister(int reg) |
| 1158 | : DeferredAction(ActionNode::INCREMENT_REGISTER, reg) { } |
| 1159 | }; |
| 1160 | |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1161 | Trace() |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1162 | : cp_offset_(0), |
| 1163 | actions_(NULL), |
| 1164 | backtrack_(NULL), |
| 1165 | stop_node_(NULL), |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1166 | loop_label_(NULL), |
| 1167 | characters_preloaded_(0), |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 1168 | bound_checked_up_to_(0), |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 1169 | flush_budget_(100), |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 1170 | at_start_(UNKNOWN) { } |
| 1171 | |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1172 | // End the trace. This involves flushing the deferred actions in the trace |
| 1173 | // and pushing a backtrack location onto the backtrack stack. Once this is |
| 1174 | // done we can start a new trace or go to one that has already been |
| 1175 | // generated. |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1176 | void Flush(RegExpCompiler* compiler, RegExpNode* successor); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1177 | int cp_offset() { return cp_offset_; } |
| 1178 | DeferredAction* actions() { return actions_; } |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1179 | // A trivial trace is one that has no deferred actions or other state that |
| 1180 | // affects the assumptions used when generating code. There is no recorded |
| 1181 | // backtrack location in a trivial trace, so with a trivial trace we will |
| 1182 | // generate code that, on a failure to match, gets the backtrack location |
| 1183 | // from the backtrack stack rather than using a direct jump instruction. We |
| 1184 | // always start code generation with a trivial trace and non-trivial traces |
| 1185 | // are created as we emit code for nodes or add to the list of deferred |
| 1186 | // actions in the trace. The location of the code generated for a node using |
| 1187 | // a trivial trace is recorded in a label in the node so that gotos can be |
| 1188 | // generated to that code. |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1189 | bool is_trivial() { |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1190 | return backtrack_ == NULL && |
| 1191 | actions_ == NULL && |
| 1192 | cp_offset_ == 0 && |
| 1193 | characters_preloaded_ == 0 && |
| 1194 | bound_checked_up_to_ == 0 && |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 1195 | quick_check_performed_.characters() == 0 && |
| 1196 | at_start_ == UNKNOWN; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1197 | } |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 1198 | TriBool at_start() { return at_start_; } |
| 1199 | void set_at_start(bool at_start) { at_start_ = at_start ? TRUE : FALSE; } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1200 | Label* backtrack() { return backtrack_; } |
| 1201 | Label* loop_label() { return loop_label_; } |
| 1202 | RegExpNode* stop_node() { return stop_node_; } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1203 | int characters_preloaded() { return characters_preloaded_; } |
| 1204 | int bound_checked_up_to() { return bound_checked_up_to_; } |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 1205 | int flush_budget() { return flush_budget_; } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1206 | QuickCheckDetails* quick_check_performed() { return &quick_check_performed_; } |
| 1207 | bool mentions_reg(int reg); |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1208 | // Returns true if a deferred position store exists to the specified |
| 1209 | // register and stores the offset in the out-parameter. Otherwise |
| 1210 | // returns false. |
| 1211 | bool GetStoredPosition(int reg, int* cp_offset); |
| 1212 | // These set methods and AdvanceCurrentPositionInTrace should be used only on |
| 1213 | // new traces - the intention is that traces are immutable after creation. |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1214 | void add_action(DeferredAction* new_action) { |
| 1215 | ASSERT(new_action->next_ == NULL); |
| 1216 | new_action->next_ = actions_; |
| 1217 | actions_ = new_action; |
| 1218 | } |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1219 | void set_backtrack(Label* backtrack) { backtrack_ = backtrack; } |
| 1220 | void set_stop_node(RegExpNode* node) { stop_node_ = node; } |
| 1221 | void set_loop_label(Label* label) { loop_label_ = label; } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1222 | void set_characters_preloaded(int cpre) { characters_preloaded_ = cpre; } |
| 1223 | void set_bound_checked_up_to(int to) { bound_checked_up_to_ = to; } |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 1224 | void set_flush_budget(int to) { flush_budget_ = to; } |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1225 | void set_quick_check_performed(QuickCheckDetails* d) { |
| 1226 | quick_check_performed_ = *d; |
| 1227 | } |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1228 | void InvalidateCurrentCharacter(); |
| 1229 | void AdvanceCurrentPositionInTrace(int by, RegExpCompiler* compiler); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1230 | private: |
| 1231 | int FindAffectedRegisters(OutSet* affected_registers); |
| 1232 | void PerformDeferredActions(RegExpMacroAssembler* macro, |
| 1233 | int max_register, |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1234 | OutSet& affected_registers, |
| 1235 | OutSet* registers_to_pop, |
| 1236 | OutSet* registers_to_clear); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1237 | void RestoreAffectedRegisters(RegExpMacroAssembler* macro, |
| 1238 | int max_register, |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 1239 | OutSet& registers_to_pop, |
| 1240 | OutSet& registers_to_clear); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1241 | int cp_offset_; |
| 1242 | DeferredAction* actions_; |
| 1243 | Label* backtrack_; |
| 1244 | RegExpNode* stop_node_; |
| 1245 | Label* loop_label_; |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1246 | int characters_preloaded_; |
| 1247 | int bound_checked_up_to_; |
| 1248 | QuickCheckDetails quick_check_performed_; |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 1249 | int flush_budget_; |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 1250 | TriBool at_start_; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1251 | }; |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1252 | |
| 1253 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1254 | class NodeVisitor { |
| 1255 | public: |
| 1256 | virtual ~NodeVisitor() { } |
| 1257 | #define DECLARE_VISIT(Type) \ |
| 1258 | virtual void Visit##Type(Type##Node* that) = 0; |
| 1259 | FOR_EACH_NODE_TYPE(DECLARE_VISIT) |
| 1260 | #undef DECLARE_VISIT |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1261 | virtual void VisitLoopChoice(LoopChoiceNode* that) { VisitChoice(that); } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1262 | }; |
| 1263 | |
| 1264 | |
| 1265 | // Node visitor used to add the start set of the alternatives to the |
| 1266 | // dispatch table of a choice node. |
| 1267 | class DispatchTableConstructor: public NodeVisitor { |
| 1268 | public: |
| 1269 | DispatchTableConstructor(DispatchTable* table, bool ignore_case) |
| 1270 | : table_(table), |
| 1271 | choice_index_(-1), |
| 1272 | ignore_case_(ignore_case) { } |
| 1273 | |
| 1274 | void BuildTable(ChoiceNode* node); |
| 1275 | |
| 1276 | void AddRange(CharacterRange range) { |
| 1277 | table()->AddRange(range, choice_index_); |
| 1278 | } |
| 1279 | |
| 1280 | void AddInverse(ZoneList<CharacterRange>* ranges); |
| 1281 | |
| 1282 | #define DECLARE_VISIT(Type) \ |
| 1283 | virtual void Visit##Type(Type##Node* that); |
| 1284 | FOR_EACH_NODE_TYPE(DECLARE_VISIT) |
| 1285 | #undef DECLARE_VISIT |
| 1286 | |
| 1287 | DispatchTable* table() { return table_; } |
| 1288 | void set_choice_index(int value) { choice_index_ = value; } |
| 1289 | |
| 1290 | protected: |
ager@chromium.org | 5ec4892 | 2009-05-05 07:25:34 +0000 | [diff] [blame] | 1291 | DispatchTable* table_; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1292 | int choice_index_; |
| 1293 | bool ignore_case_; |
| 1294 | }; |
| 1295 | |
| 1296 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1297 | // Assertion propagation moves information about assertions such as |
| 1298 | // \b to the affected nodes. For instance, in /.\b./ information must |
| 1299 | // be propagated to the first '.' that whatever follows needs to know |
| 1300 | // if it matched a word or a non-word, and to the second '.' that it |
| 1301 | // has to check if it succeeds a word or non-word. In this case the |
| 1302 | // result will be something like: |
| 1303 | // |
| 1304 | // +-------+ +------------+ |
| 1305 | // | . | | . | |
| 1306 | // +-------+ ---> +------------+ |
| 1307 | // | word? | | check word | |
| 1308 | // +-------+ +------------+ |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1309 | class Analysis: public NodeVisitor { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1310 | public: |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1311 | explicit Analysis(bool ignore_case) |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1312 | : ignore_case_(ignore_case) { } |
| 1313 | void EnsureAnalyzed(RegExpNode* node); |
| 1314 | |
| 1315 | #define DECLARE_VISIT(Type) \ |
| 1316 | virtual void Visit##Type(Type##Node* that); |
| 1317 | FOR_EACH_NODE_TYPE(DECLARE_VISIT) |
| 1318 | #undef DECLARE_VISIT |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1319 | virtual void VisitLoopChoice(LoopChoiceNode* that); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1320 | |
| 1321 | private: |
| 1322 | bool ignore_case_; |
| 1323 | |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1324 | DISALLOW_IMPLICIT_CONSTRUCTORS(Analysis); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1325 | }; |
| 1326 | |
| 1327 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1328 | struct RegExpCompileData { |
| 1329 | RegExpCompileData() |
| 1330 | : tree(NULL), |
| 1331 | node(NULL), |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1332 | simple(true), |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 1333 | contains_anchor(false), |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1334 | capture_count(0) { } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1335 | RegExpTree* tree; |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1336 | RegExpNode* node; |
christian.plesner.hansen@gmail.com | 37abdec | 2009-01-06 14:43:28 +0000 | [diff] [blame] | 1337 | bool simple; |
iposva@chromium.org | 245aa85 | 2009-02-10 00:49:54 +0000 | [diff] [blame] | 1338 | bool contains_anchor; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1339 | Handle<String> error; |
| 1340 | int capture_count; |
| 1341 | }; |
| 1342 | |
| 1343 | |
| 1344 | class RegExpEngine: public AllStatic { |
| 1345 | public: |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 1346 | struct CompilationResult { |
| 1347 | explicit CompilationResult(const char* error_message) |
| 1348 | : error_message(error_message), |
| 1349 | code(Heap::the_hole_value()), |
| 1350 | num_registers(0) {} |
| 1351 | CompilationResult(Object* code, int registers) |
| 1352 | : error_message(NULL), |
| 1353 | code(code), |
| 1354 | num_registers(registers) {} |
| 1355 | const char* error_message; |
| 1356 | Object* code; |
| 1357 | int num_registers; |
| 1358 | }; |
| 1359 | |
| 1360 | static CompilationResult Compile(RegExpCompileData* input, |
| 1361 | bool ignore_case, |
| 1362 | bool multiline, |
| 1363 | Handle<String> pattern, |
| 1364 | bool is_ascii); |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 1365 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1366 | static void DotPrint(const char* label, RegExpNode* node, bool ignore_case); |
| 1367 | }; |
| 1368 | |
| 1369 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1370 | } } // namespace v8::internal |
| 1371 | |
| 1372 | #endif // V8_JSREGEXP_H_ |