Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "src/regexp/jsregexp.h" |
| 6 | |
| 7 | #include "src/ast/ast.h" |
| 8 | #include "src/base/platform/platform.h" |
| 9 | #include "src/compilation-cache.h" |
| 10 | #include "src/compiler.h" |
| 11 | #include "src/execution.h" |
| 12 | #include "src/factory.h" |
| 13 | #include "src/isolate-inl.h" |
| 14 | #include "src/messages.h" |
| 15 | #include "src/ostreams.h" |
| 16 | #include "src/regexp/interpreter-irregexp.h" |
| 17 | #include "src/regexp/jsregexp-inl.h" |
| 18 | #include "src/regexp/regexp-macro-assembler.h" |
| 19 | #include "src/regexp/regexp-macro-assembler-irregexp.h" |
| 20 | #include "src/regexp/regexp-macro-assembler-tracer.h" |
| 21 | #include "src/regexp/regexp-parser.h" |
| 22 | #include "src/regexp/regexp-stack.h" |
| 23 | #include "src/runtime/runtime.h" |
| 24 | #include "src/splay-tree-inl.h" |
| 25 | #include "src/string-search.h" |
| 26 | #include "src/unicode-decoder.h" |
| 27 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 28 | #ifdef V8_I18N_SUPPORT |
| 29 | #include "unicode/uset.h" |
| 30 | #include "unicode/utypes.h" |
| 31 | #endif // V8_I18N_SUPPORT |
| 32 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 33 | #ifndef V8_INTERPRETED_REGEXP |
| 34 | #if V8_TARGET_ARCH_IA32 |
| 35 | #include "src/regexp/ia32/regexp-macro-assembler-ia32.h" |
| 36 | #elif V8_TARGET_ARCH_X64 |
| 37 | #include "src/regexp/x64/regexp-macro-assembler-x64.h" |
| 38 | #elif V8_TARGET_ARCH_ARM64 |
| 39 | #include "src/regexp/arm64/regexp-macro-assembler-arm64.h" |
| 40 | #elif V8_TARGET_ARCH_ARM |
| 41 | #include "src/regexp/arm/regexp-macro-assembler-arm.h" |
| 42 | #elif V8_TARGET_ARCH_PPC |
| 43 | #include "src/regexp/ppc/regexp-macro-assembler-ppc.h" |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 44 | #elif V8_TARGET_ARCH_S390 |
| 45 | #include "src/regexp/s390/regexp-macro-assembler-s390.h" |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 46 | #elif V8_TARGET_ARCH_MIPS |
| 47 | #include "src/regexp/mips/regexp-macro-assembler-mips.h" |
| 48 | #elif V8_TARGET_ARCH_MIPS64 |
| 49 | #include "src/regexp/mips64/regexp-macro-assembler-mips64.h" |
| 50 | #elif V8_TARGET_ARCH_X87 |
| 51 | #include "src/regexp/x87/regexp-macro-assembler-x87.h" |
| 52 | #else |
| 53 | #error Unsupported target architecture. |
| 54 | #endif |
| 55 | #endif |
| 56 | |
| 57 | |
| 58 | namespace v8 { |
| 59 | namespace internal { |
| 60 | |
| 61 | MUST_USE_RESULT |
| 62 | static inline MaybeHandle<Object> ThrowRegExpException( |
| 63 | Handle<JSRegExp> re, Handle<String> pattern, Handle<String> error_text) { |
| 64 | Isolate* isolate = re->GetIsolate(); |
| 65 | THROW_NEW_ERROR(isolate, NewSyntaxError(MessageTemplate::kMalformedRegExp, |
| 66 | pattern, error_text), |
| 67 | Object); |
| 68 | } |
| 69 | |
| 70 | |
| 71 | inline void ThrowRegExpException(Handle<JSRegExp> re, |
| 72 | Handle<String> error_text) { |
| 73 | USE(ThrowRegExpException(re, Handle<String>(re->Pattern()), error_text)); |
| 74 | } |
| 75 | |
| 76 | |
| 77 | ContainedInLattice AddRange(ContainedInLattice containment, |
| 78 | const int* ranges, |
| 79 | int ranges_length, |
| 80 | Interval new_range) { |
| 81 | DCHECK((ranges_length & 1) == 1); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 82 | DCHECK(ranges[ranges_length - 1] == String::kMaxCodePoint + 1); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 83 | if (containment == kLatticeUnknown) return containment; |
| 84 | bool inside = false; |
| 85 | int last = 0; |
| 86 | for (int i = 0; i < ranges_length; inside = !inside, last = ranges[i], i++) { |
| 87 | // Consider the range from last to ranges[i]. |
| 88 | // We haven't got to the new range yet. |
| 89 | if (ranges[i] <= new_range.from()) continue; |
| 90 | // New range is wholly inside last-ranges[i]. Note that new_range.to() is |
| 91 | // inclusive, but the values in ranges are not. |
| 92 | if (last <= new_range.from() && new_range.to() < ranges[i]) { |
| 93 | return Combine(containment, inside ? kLatticeIn : kLatticeOut); |
| 94 | } |
| 95 | return kLatticeUnknown; |
| 96 | } |
| 97 | return containment; |
| 98 | } |
| 99 | |
| 100 | |
| 101 | // More makes code generation slower, less makes V8 benchmark score lower. |
| 102 | const int kMaxLookaheadForBoyerMoore = 8; |
| 103 | // In a 3-character pattern you can maximally step forwards 3 characters |
| 104 | // at a time, which is not always enough to pay for the extra logic. |
| 105 | const int kPatternTooShortForBoyerMoore = 2; |
| 106 | |
| 107 | |
| 108 | // Identifies the sort of regexps where the regexp engine is faster |
| 109 | // than the code used for atom matches. |
| 110 | static bool HasFewDifferentCharacters(Handle<String> pattern) { |
| 111 | int length = Min(kMaxLookaheadForBoyerMoore, pattern->length()); |
| 112 | if (length <= kPatternTooShortForBoyerMoore) return false; |
| 113 | const int kMod = 128; |
| 114 | bool character_found[kMod]; |
| 115 | int different = 0; |
| 116 | memset(&character_found[0], 0, sizeof(character_found)); |
| 117 | for (int i = 0; i < length; i++) { |
| 118 | int ch = (pattern->Get(i) & (kMod - 1)); |
| 119 | if (!character_found[ch]) { |
| 120 | character_found[ch] = true; |
| 121 | different++; |
| 122 | // We declare a regexp low-alphabet if it has at least 3 times as many |
| 123 | // characters as it has different characters. |
| 124 | if (different * 3 > length) return false; |
| 125 | } |
| 126 | } |
| 127 | return true; |
| 128 | } |
| 129 | |
| 130 | |
| 131 | // Generic RegExp methods. Dispatches to implementation specific methods. |
| 132 | |
| 133 | |
| 134 | MaybeHandle<Object> RegExpImpl::Compile(Handle<JSRegExp> re, |
| 135 | Handle<String> pattern, |
| 136 | JSRegExp::Flags flags) { |
| 137 | Isolate* isolate = re->GetIsolate(); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 138 | Zone zone(isolate->allocator()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 139 | CompilationCache* compilation_cache = isolate->compilation_cache(); |
| 140 | MaybeHandle<FixedArray> maybe_cached = |
| 141 | compilation_cache->LookupRegExp(pattern, flags); |
| 142 | Handle<FixedArray> cached; |
| 143 | bool in_cache = maybe_cached.ToHandle(&cached); |
| 144 | LOG(isolate, RegExpCompileEvent(re, in_cache)); |
| 145 | |
| 146 | Handle<Object> result; |
| 147 | if (in_cache) { |
| 148 | re->set_data(*cached); |
| 149 | return re; |
| 150 | } |
| 151 | pattern = String::Flatten(pattern); |
| 152 | PostponeInterruptsScope postpone(isolate); |
| 153 | RegExpCompileData parse_result; |
| 154 | FlatStringReader reader(isolate, pattern); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 155 | if (!RegExpParser::ParseRegExp(re->GetIsolate(), &zone, &reader, flags, |
| 156 | &parse_result)) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 157 | // Throw an exception if we fail to parse the pattern. |
| 158 | return ThrowRegExpException(re, pattern, parse_result.error); |
| 159 | } |
| 160 | |
| 161 | bool has_been_compiled = false; |
| 162 | |
| 163 | if (parse_result.simple && !(flags & JSRegExp::kIgnoreCase) && |
| 164 | !(flags & JSRegExp::kSticky) && !HasFewDifferentCharacters(pattern)) { |
| 165 | // Parse-tree is a single atom that is equal to the pattern. |
| 166 | AtomCompile(re, pattern, flags, pattern); |
| 167 | has_been_compiled = true; |
| 168 | } else if (parse_result.tree->IsAtom() && !(flags & JSRegExp::kIgnoreCase) && |
| 169 | !(flags & JSRegExp::kSticky) && parse_result.capture_count == 0) { |
| 170 | RegExpAtom* atom = parse_result.tree->AsAtom(); |
| 171 | Vector<const uc16> atom_pattern = atom->data(); |
| 172 | Handle<String> atom_string; |
| 173 | ASSIGN_RETURN_ON_EXCEPTION( |
| 174 | isolate, atom_string, |
| 175 | isolate->factory()->NewStringFromTwoByte(atom_pattern), |
| 176 | Object); |
| 177 | if (!HasFewDifferentCharacters(atom_string)) { |
| 178 | AtomCompile(re, pattern, flags, atom_string); |
| 179 | has_been_compiled = true; |
| 180 | } |
| 181 | } |
| 182 | if (!has_been_compiled) { |
| 183 | IrregexpInitialize(re, pattern, flags, parse_result.capture_count); |
| 184 | } |
| 185 | DCHECK(re->data()->IsFixedArray()); |
| 186 | // Compilation succeeded so the data is set on the regexp |
| 187 | // and we can store it in the cache. |
| 188 | Handle<FixedArray> data(FixedArray::cast(re->data())); |
| 189 | compilation_cache->PutRegExp(pattern, flags, data); |
| 190 | |
| 191 | return re; |
| 192 | } |
| 193 | |
| 194 | |
| 195 | MaybeHandle<Object> RegExpImpl::Exec(Handle<JSRegExp> regexp, |
| 196 | Handle<String> subject, |
| 197 | int index, |
| 198 | Handle<JSArray> last_match_info) { |
| 199 | switch (regexp->TypeTag()) { |
| 200 | case JSRegExp::ATOM: |
| 201 | return AtomExec(regexp, subject, index, last_match_info); |
| 202 | case JSRegExp::IRREGEXP: { |
| 203 | return IrregexpExec(regexp, subject, index, last_match_info); |
| 204 | } |
| 205 | default: |
| 206 | UNREACHABLE(); |
| 207 | return MaybeHandle<Object>(); |
| 208 | } |
| 209 | } |
| 210 | |
| 211 | |
| 212 | // RegExp Atom implementation: Simple string search using indexOf. |
| 213 | |
| 214 | |
| 215 | void RegExpImpl::AtomCompile(Handle<JSRegExp> re, |
| 216 | Handle<String> pattern, |
| 217 | JSRegExp::Flags flags, |
| 218 | Handle<String> match_pattern) { |
| 219 | re->GetIsolate()->factory()->SetRegExpAtomData(re, |
| 220 | JSRegExp::ATOM, |
| 221 | pattern, |
| 222 | flags, |
| 223 | match_pattern); |
| 224 | } |
| 225 | |
| 226 | |
| 227 | static void SetAtomLastCapture(FixedArray* array, |
| 228 | String* subject, |
| 229 | int from, |
| 230 | int to) { |
| 231 | SealHandleScope shs(array->GetIsolate()); |
| 232 | RegExpImpl::SetLastCaptureCount(array, 2); |
| 233 | RegExpImpl::SetLastSubject(array, subject); |
| 234 | RegExpImpl::SetLastInput(array, subject); |
| 235 | RegExpImpl::SetCapture(array, 0, from); |
| 236 | RegExpImpl::SetCapture(array, 1, to); |
| 237 | } |
| 238 | |
| 239 | |
| 240 | int RegExpImpl::AtomExecRaw(Handle<JSRegExp> regexp, |
| 241 | Handle<String> subject, |
| 242 | int index, |
| 243 | int32_t* output, |
| 244 | int output_size) { |
| 245 | Isolate* isolate = regexp->GetIsolate(); |
| 246 | |
| 247 | DCHECK(0 <= index); |
| 248 | DCHECK(index <= subject->length()); |
| 249 | |
| 250 | subject = String::Flatten(subject); |
| 251 | DisallowHeapAllocation no_gc; // ensure vectors stay valid |
| 252 | |
| 253 | String* needle = String::cast(regexp->DataAt(JSRegExp::kAtomPatternIndex)); |
| 254 | int needle_len = needle->length(); |
| 255 | DCHECK(needle->IsFlat()); |
| 256 | DCHECK_LT(0, needle_len); |
| 257 | |
| 258 | if (index + needle_len > subject->length()) { |
| 259 | return RegExpImpl::RE_FAILURE; |
| 260 | } |
| 261 | |
| 262 | for (int i = 0; i < output_size; i += 2) { |
| 263 | String::FlatContent needle_content = needle->GetFlatContent(); |
| 264 | String::FlatContent subject_content = subject->GetFlatContent(); |
| 265 | DCHECK(needle_content.IsFlat()); |
| 266 | DCHECK(subject_content.IsFlat()); |
| 267 | // dispatch on type of strings |
| 268 | index = |
| 269 | (needle_content.IsOneByte() |
| 270 | ? (subject_content.IsOneByte() |
| 271 | ? SearchString(isolate, subject_content.ToOneByteVector(), |
| 272 | needle_content.ToOneByteVector(), index) |
| 273 | : SearchString(isolate, subject_content.ToUC16Vector(), |
| 274 | needle_content.ToOneByteVector(), index)) |
| 275 | : (subject_content.IsOneByte() |
| 276 | ? SearchString(isolate, subject_content.ToOneByteVector(), |
| 277 | needle_content.ToUC16Vector(), index) |
| 278 | : SearchString(isolate, subject_content.ToUC16Vector(), |
| 279 | needle_content.ToUC16Vector(), index))); |
| 280 | if (index == -1) { |
| 281 | return i / 2; // Return number of matches. |
| 282 | } else { |
| 283 | output[i] = index; |
| 284 | output[i+1] = index + needle_len; |
| 285 | index += needle_len; |
| 286 | } |
| 287 | } |
| 288 | return output_size / 2; |
| 289 | } |
| 290 | |
| 291 | |
| 292 | Handle<Object> RegExpImpl::AtomExec(Handle<JSRegExp> re, |
| 293 | Handle<String> subject, |
| 294 | int index, |
| 295 | Handle<JSArray> last_match_info) { |
| 296 | Isolate* isolate = re->GetIsolate(); |
| 297 | |
| 298 | static const int kNumRegisters = 2; |
| 299 | STATIC_ASSERT(kNumRegisters <= Isolate::kJSRegexpStaticOffsetsVectorSize); |
| 300 | int32_t* output_registers = isolate->jsregexp_static_offsets_vector(); |
| 301 | |
| 302 | int res = AtomExecRaw(re, subject, index, output_registers, kNumRegisters); |
| 303 | |
| 304 | if (res == RegExpImpl::RE_FAILURE) return isolate->factory()->null_value(); |
| 305 | |
| 306 | DCHECK_EQ(res, RegExpImpl::RE_SUCCESS); |
| 307 | SealHandleScope shs(isolate); |
| 308 | FixedArray* array = FixedArray::cast(last_match_info->elements()); |
| 309 | SetAtomLastCapture(array, *subject, output_registers[0], output_registers[1]); |
| 310 | return last_match_info; |
| 311 | } |
| 312 | |
| 313 | |
| 314 | // Irregexp implementation. |
| 315 | |
| 316 | // Ensures that the regexp object contains a compiled version of the |
| 317 | // source for either one-byte or two-byte subject strings. |
| 318 | // If the compiled version doesn't already exist, it is compiled |
| 319 | // from the source pattern. |
| 320 | // If compilation fails, an exception is thrown and this function |
| 321 | // returns false. |
| 322 | bool RegExpImpl::EnsureCompiledIrregexp(Handle<JSRegExp> re, |
| 323 | Handle<String> sample_subject, |
| 324 | bool is_one_byte) { |
| 325 | Object* compiled_code = re->DataAt(JSRegExp::code_index(is_one_byte)); |
| 326 | #ifdef V8_INTERPRETED_REGEXP |
| 327 | if (compiled_code->IsByteArray()) return true; |
| 328 | #else // V8_INTERPRETED_REGEXP (RegExp native code) |
| 329 | if (compiled_code->IsCode()) return true; |
| 330 | #endif |
| 331 | // We could potentially have marked this as flushable, but have kept |
| 332 | // a saved version if we did not flush it yet. |
| 333 | Object* saved_code = re->DataAt(JSRegExp::saved_code_index(is_one_byte)); |
| 334 | if (saved_code->IsCode()) { |
| 335 | // Reinstate the code in the original place. |
| 336 | re->SetDataAt(JSRegExp::code_index(is_one_byte), saved_code); |
| 337 | DCHECK(compiled_code->IsSmi()); |
| 338 | return true; |
| 339 | } |
| 340 | return CompileIrregexp(re, sample_subject, is_one_byte); |
| 341 | } |
| 342 | |
| 343 | |
| 344 | bool RegExpImpl::CompileIrregexp(Handle<JSRegExp> re, |
| 345 | Handle<String> sample_subject, |
| 346 | bool is_one_byte) { |
| 347 | // Compile the RegExp. |
| 348 | Isolate* isolate = re->GetIsolate(); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 349 | Zone zone(isolate->allocator()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 350 | PostponeInterruptsScope postpone(isolate); |
| 351 | // If we had a compilation error the last time this is saved at the |
| 352 | // saved code index. |
| 353 | Object* entry = re->DataAt(JSRegExp::code_index(is_one_byte)); |
| 354 | // When arriving here entry can only be a smi, either representing an |
| 355 | // uncompiled regexp, a previous compilation error, or code that has |
| 356 | // been flushed. |
| 357 | DCHECK(entry->IsSmi()); |
| 358 | int entry_value = Smi::cast(entry)->value(); |
| 359 | DCHECK(entry_value == JSRegExp::kUninitializedValue || |
| 360 | entry_value == JSRegExp::kCompilationErrorValue || |
| 361 | (entry_value < JSRegExp::kCodeAgeMask && entry_value >= 0)); |
| 362 | |
| 363 | if (entry_value == JSRegExp::kCompilationErrorValue) { |
| 364 | // A previous compilation failed and threw an error which we store in |
| 365 | // the saved code index (we store the error message, not the actual |
| 366 | // error). Recreate the error object and throw it. |
| 367 | Object* error_string = re->DataAt(JSRegExp::saved_code_index(is_one_byte)); |
| 368 | DCHECK(error_string->IsString()); |
| 369 | Handle<String> error_message(String::cast(error_string)); |
| 370 | ThrowRegExpException(re, error_message); |
| 371 | return false; |
| 372 | } |
| 373 | |
| 374 | JSRegExp::Flags flags = re->GetFlags(); |
| 375 | |
| 376 | Handle<String> pattern(re->Pattern()); |
| 377 | pattern = String::Flatten(pattern); |
| 378 | RegExpCompileData compile_data; |
| 379 | FlatStringReader reader(isolate, pattern); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 380 | if (!RegExpParser::ParseRegExp(isolate, &zone, &reader, flags, |
| 381 | &compile_data)) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 382 | // Throw an exception if we fail to parse the pattern. |
| 383 | // THIS SHOULD NOT HAPPEN. We already pre-parsed it successfully once. |
| 384 | USE(ThrowRegExpException(re, pattern, compile_data.error)); |
| 385 | return false; |
| 386 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 387 | RegExpEngine::CompilationResult result = |
| 388 | RegExpEngine::Compile(isolate, &zone, &compile_data, flags, pattern, |
| 389 | sample_subject, is_one_byte); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 390 | if (result.error_message != NULL) { |
| 391 | // Unable to compile regexp. |
| 392 | Handle<String> error_message = isolate->factory()->NewStringFromUtf8( |
| 393 | CStrVector(result.error_message)).ToHandleChecked(); |
| 394 | ThrowRegExpException(re, error_message); |
| 395 | return false; |
| 396 | } |
| 397 | |
| 398 | Handle<FixedArray> data = Handle<FixedArray>(FixedArray::cast(re->data())); |
| 399 | data->set(JSRegExp::code_index(is_one_byte), result.code); |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 400 | SetIrregexpCaptureNameMap(*data, compile_data.capture_name_map); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 401 | int register_max = IrregexpMaxRegisterCount(*data); |
| 402 | if (result.num_registers > register_max) { |
| 403 | SetIrregexpMaxRegisterCount(*data, result.num_registers); |
| 404 | } |
| 405 | |
| 406 | return true; |
| 407 | } |
| 408 | |
| 409 | |
| 410 | int RegExpImpl::IrregexpMaxRegisterCount(FixedArray* re) { |
| 411 | return Smi::cast( |
| 412 | re->get(JSRegExp::kIrregexpMaxRegisterCountIndex))->value(); |
| 413 | } |
| 414 | |
| 415 | |
| 416 | void RegExpImpl::SetIrregexpMaxRegisterCount(FixedArray* re, int value) { |
| 417 | re->set(JSRegExp::kIrregexpMaxRegisterCountIndex, Smi::FromInt(value)); |
| 418 | } |
| 419 | |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 420 | void RegExpImpl::SetIrregexpCaptureNameMap(FixedArray* re, |
| 421 | Handle<FixedArray> value) { |
| 422 | if (value.is_null()) { |
| 423 | re->set(JSRegExp::kIrregexpCaptureNameMapIndex, Smi::FromInt(0)); |
| 424 | } else { |
| 425 | re->set(JSRegExp::kIrregexpCaptureNameMapIndex, *value); |
| 426 | } |
| 427 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 428 | |
| 429 | int RegExpImpl::IrregexpNumberOfCaptures(FixedArray* re) { |
| 430 | return Smi::cast(re->get(JSRegExp::kIrregexpCaptureCountIndex))->value(); |
| 431 | } |
| 432 | |
| 433 | |
| 434 | int RegExpImpl::IrregexpNumberOfRegisters(FixedArray* re) { |
| 435 | return Smi::cast(re->get(JSRegExp::kIrregexpMaxRegisterCountIndex))->value(); |
| 436 | } |
| 437 | |
| 438 | |
| 439 | ByteArray* RegExpImpl::IrregexpByteCode(FixedArray* re, bool is_one_byte) { |
| 440 | return ByteArray::cast(re->get(JSRegExp::code_index(is_one_byte))); |
| 441 | } |
| 442 | |
| 443 | |
| 444 | Code* RegExpImpl::IrregexpNativeCode(FixedArray* re, bool is_one_byte) { |
| 445 | return Code::cast(re->get(JSRegExp::code_index(is_one_byte))); |
| 446 | } |
| 447 | |
| 448 | |
| 449 | void RegExpImpl::IrregexpInitialize(Handle<JSRegExp> re, |
| 450 | Handle<String> pattern, |
| 451 | JSRegExp::Flags flags, |
| 452 | int capture_count) { |
| 453 | // Initialize compiled code entries to null. |
| 454 | re->GetIsolate()->factory()->SetRegExpIrregexpData(re, |
| 455 | JSRegExp::IRREGEXP, |
| 456 | pattern, |
| 457 | flags, |
| 458 | capture_count); |
| 459 | } |
| 460 | |
| 461 | |
| 462 | int RegExpImpl::IrregexpPrepare(Handle<JSRegExp> regexp, |
| 463 | Handle<String> subject) { |
| 464 | subject = String::Flatten(subject); |
| 465 | |
| 466 | // Check representation of the underlying storage. |
| 467 | bool is_one_byte = subject->IsOneByteRepresentationUnderneath(); |
| 468 | if (!EnsureCompiledIrregexp(regexp, subject, is_one_byte)) return -1; |
| 469 | |
| 470 | #ifdef V8_INTERPRETED_REGEXP |
| 471 | // Byte-code regexp needs space allocated for all its registers. |
| 472 | // The result captures are copied to the start of the registers array |
| 473 | // if the match succeeds. This way those registers are not clobbered |
| 474 | // when we set the last match info from last successful match. |
| 475 | return IrregexpNumberOfRegisters(FixedArray::cast(regexp->data())) + |
| 476 | (IrregexpNumberOfCaptures(FixedArray::cast(regexp->data())) + 1) * 2; |
| 477 | #else // V8_INTERPRETED_REGEXP |
| 478 | // Native regexp only needs room to output captures. Registers are handled |
| 479 | // internally. |
| 480 | return (IrregexpNumberOfCaptures(FixedArray::cast(regexp->data())) + 1) * 2; |
| 481 | #endif // V8_INTERPRETED_REGEXP |
| 482 | } |
| 483 | |
| 484 | |
| 485 | int RegExpImpl::IrregexpExecRaw(Handle<JSRegExp> regexp, |
| 486 | Handle<String> subject, |
| 487 | int index, |
| 488 | int32_t* output, |
| 489 | int output_size) { |
| 490 | Isolate* isolate = regexp->GetIsolate(); |
| 491 | |
| 492 | Handle<FixedArray> irregexp(FixedArray::cast(regexp->data()), isolate); |
| 493 | |
| 494 | DCHECK(index >= 0); |
| 495 | DCHECK(index <= subject->length()); |
| 496 | DCHECK(subject->IsFlat()); |
| 497 | |
| 498 | bool is_one_byte = subject->IsOneByteRepresentationUnderneath(); |
| 499 | |
| 500 | #ifndef V8_INTERPRETED_REGEXP |
| 501 | DCHECK(output_size >= (IrregexpNumberOfCaptures(*irregexp) + 1) * 2); |
| 502 | do { |
| 503 | EnsureCompiledIrregexp(regexp, subject, is_one_byte); |
| 504 | Handle<Code> code(IrregexpNativeCode(*irregexp, is_one_byte), isolate); |
| 505 | // The stack is used to allocate registers for the compiled regexp code. |
| 506 | // This means that in case of failure, the output registers array is left |
| 507 | // untouched and contains the capture results from the previous successful |
| 508 | // match. We can use that to set the last match info lazily. |
| 509 | NativeRegExpMacroAssembler::Result res = |
| 510 | NativeRegExpMacroAssembler::Match(code, |
| 511 | subject, |
| 512 | output, |
| 513 | output_size, |
| 514 | index, |
| 515 | isolate); |
| 516 | if (res != NativeRegExpMacroAssembler::RETRY) { |
| 517 | DCHECK(res != NativeRegExpMacroAssembler::EXCEPTION || |
| 518 | isolate->has_pending_exception()); |
| 519 | STATIC_ASSERT( |
| 520 | static_cast<int>(NativeRegExpMacroAssembler::SUCCESS) == RE_SUCCESS); |
| 521 | STATIC_ASSERT( |
| 522 | static_cast<int>(NativeRegExpMacroAssembler::FAILURE) == RE_FAILURE); |
| 523 | STATIC_ASSERT(static_cast<int>(NativeRegExpMacroAssembler::EXCEPTION) |
| 524 | == RE_EXCEPTION); |
| 525 | return static_cast<IrregexpResult>(res); |
| 526 | } |
| 527 | // If result is RETRY, the string has changed representation, and we |
| 528 | // must restart from scratch. |
| 529 | // In this case, it means we must make sure we are prepared to handle |
| 530 | // the, potentially, different subject (the string can switch between |
| 531 | // being internal and external, and even between being Latin1 and UC16, |
| 532 | // but the characters are always the same). |
| 533 | IrregexpPrepare(regexp, subject); |
| 534 | is_one_byte = subject->IsOneByteRepresentationUnderneath(); |
| 535 | } while (true); |
| 536 | UNREACHABLE(); |
| 537 | return RE_EXCEPTION; |
| 538 | #else // V8_INTERPRETED_REGEXP |
| 539 | |
| 540 | DCHECK(output_size >= IrregexpNumberOfRegisters(*irregexp)); |
| 541 | // We must have done EnsureCompiledIrregexp, so we can get the number of |
| 542 | // registers. |
| 543 | int number_of_capture_registers = |
| 544 | (IrregexpNumberOfCaptures(*irregexp) + 1) * 2; |
| 545 | int32_t* raw_output = &output[number_of_capture_registers]; |
| 546 | // We do not touch the actual capture result registers until we know there |
| 547 | // has been a match so that we can use those capture results to set the |
| 548 | // last match info. |
| 549 | for (int i = number_of_capture_registers - 1; i >= 0; i--) { |
| 550 | raw_output[i] = -1; |
| 551 | } |
| 552 | Handle<ByteArray> byte_codes(IrregexpByteCode(*irregexp, is_one_byte), |
| 553 | isolate); |
| 554 | |
| 555 | IrregexpResult result = IrregexpInterpreter::Match(isolate, |
| 556 | byte_codes, |
| 557 | subject, |
| 558 | raw_output, |
| 559 | index); |
| 560 | if (result == RE_SUCCESS) { |
| 561 | // Copy capture results to the start of the registers array. |
| 562 | MemCopy(output, raw_output, number_of_capture_registers * sizeof(int32_t)); |
| 563 | } |
| 564 | if (result == RE_EXCEPTION) { |
| 565 | DCHECK(!isolate->has_pending_exception()); |
| 566 | isolate->StackOverflow(); |
| 567 | } |
| 568 | return result; |
| 569 | #endif // V8_INTERPRETED_REGEXP |
| 570 | } |
| 571 | |
| 572 | |
| 573 | MaybeHandle<Object> RegExpImpl::IrregexpExec(Handle<JSRegExp> regexp, |
| 574 | Handle<String> subject, |
| 575 | int previous_index, |
| 576 | Handle<JSArray> last_match_info) { |
| 577 | Isolate* isolate = regexp->GetIsolate(); |
| 578 | DCHECK_EQ(regexp->TypeTag(), JSRegExp::IRREGEXP); |
| 579 | |
| 580 | // Prepare space for the return values. |
| 581 | #if defined(V8_INTERPRETED_REGEXP) && defined(DEBUG) |
| 582 | if (FLAG_trace_regexp_bytecodes) { |
| 583 | String* pattern = regexp->Pattern(); |
| 584 | PrintF("\n\nRegexp match: /%s/\n\n", pattern->ToCString().get()); |
| 585 | PrintF("\n\nSubject string: '%s'\n\n", subject->ToCString().get()); |
| 586 | } |
| 587 | #endif |
| 588 | int required_registers = RegExpImpl::IrregexpPrepare(regexp, subject); |
| 589 | if (required_registers < 0) { |
| 590 | // Compiling failed with an exception. |
| 591 | DCHECK(isolate->has_pending_exception()); |
| 592 | return MaybeHandle<Object>(); |
| 593 | } |
| 594 | |
| 595 | int32_t* output_registers = NULL; |
| 596 | if (required_registers > Isolate::kJSRegexpStaticOffsetsVectorSize) { |
| 597 | output_registers = NewArray<int32_t>(required_registers); |
| 598 | } |
| 599 | base::SmartArrayPointer<int32_t> auto_release(output_registers); |
| 600 | if (output_registers == NULL) { |
| 601 | output_registers = isolate->jsregexp_static_offsets_vector(); |
| 602 | } |
| 603 | |
| 604 | int res = RegExpImpl::IrregexpExecRaw( |
| 605 | regexp, subject, previous_index, output_registers, required_registers); |
| 606 | if (res == RE_SUCCESS) { |
| 607 | int capture_count = |
| 608 | IrregexpNumberOfCaptures(FixedArray::cast(regexp->data())); |
| 609 | return SetLastMatchInfo( |
| 610 | last_match_info, subject, capture_count, output_registers); |
| 611 | } |
| 612 | if (res == RE_EXCEPTION) { |
| 613 | DCHECK(isolate->has_pending_exception()); |
| 614 | return MaybeHandle<Object>(); |
| 615 | } |
| 616 | DCHECK(res == RE_FAILURE); |
| 617 | return isolate->factory()->null_value(); |
| 618 | } |
| 619 | |
| 620 | |
| 621 | static void EnsureSize(Handle<JSArray> array, uint32_t minimum_size) { |
| 622 | if (static_cast<uint32_t>(array->elements()->length()) < minimum_size) { |
| 623 | JSArray::SetLength(array, minimum_size); |
| 624 | } |
| 625 | } |
| 626 | |
| 627 | |
| 628 | Handle<JSArray> RegExpImpl::SetLastMatchInfo(Handle<JSArray> last_match_info, |
| 629 | Handle<String> subject, |
| 630 | int capture_count, |
| 631 | int32_t* match) { |
| 632 | DCHECK(last_match_info->HasFastObjectElements()); |
| 633 | int capture_register_count = (capture_count + 1) * 2; |
| 634 | EnsureSize(last_match_info, capture_register_count + kLastMatchOverhead); |
| 635 | DisallowHeapAllocation no_allocation; |
| 636 | FixedArray* array = FixedArray::cast(last_match_info->elements()); |
| 637 | if (match != NULL) { |
| 638 | for (int i = 0; i < capture_register_count; i += 2) { |
| 639 | SetCapture(array, i, match[i]); |
| 640 | SetCapture(array, i + 1, match[i + 1]); |
| 641 | } |
| 642 | } |
| 643 | SetLastCaptureCount(array, capture_register_count); |
| 644 | SetLastSubject(array, *subject); |
| 645 | SetLastInput(array, *subject); |
| 646 | return last_match_info; |
| 647 | } |
| 648 | |
| 649 | |
| 650 | RegExpImpl::GlobalCache::GlobalCache(Handle<JSRegExp> regexp, |
| 651 | Handle<String> subject, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 652 | Isolate* isolate) |
| 653 | : register_array_(NULL), |
| 654 | register_array_size_(0), |
| 655 | regexp_(regexp), |
| 656 | subject_(subject) { |
| 657 | #ifdef V8_INTERPRETED_REGEXP |
| 658 | bool interpreted = true; |
| 659 | #else |
| 660 | bool interpreted = false; |
| 661 | #endif // V8_INTERPRETED_REGEXP |
| 662 | |
| 663 | if (regexp_->TypeTag() == JSRegExp::ATOM) { |
| 664 | static const int kAtomRegistersPerMatch = 2; |
| 665 | registers_per_match_ = kAtomRegistersPerMatch; |
| 666 | // There is no distinction between interpreted and native for atom regexps. |
| 667 | interpreted = false; |
| 668 | } else { |
| 669 | registers_per_match_ = RegExpImpl::IrregexpPrepare(regexp_, subject_); |
| 670 | if (registers_per_match_ < 0) { |
| 671 | num_matches_ = -1; // Signal exception. |
| 672 | return; |
| 673 | } |
| 674 | } |
| 675 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 676 | DCHECK_NE(0, regexp->GetFlags() & JSRegExp::kGlobal); |
| 677 | if (!interpreted) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 678 | register_array_size_ = |
| 679 | Max(registers_per_match_, Isolate::kJSRegexpStaticOffsetsVectorSize); |
| 680 | max_matches_ = register_array_size_ / registers_per_match_; |
| 681 | } else { |
| 682 | // Global loop in interpreted regexp is not implemented. We choose |
| 683 | // the size of the offsets vector so that it can only store one match. |
| 684 | register_array_size_ = registers_per_match_; |
| 685 | max_matches_ = 1; |
| 686 | } |
| 687 | |
| 688 | if (register_array_size_ > Isolate::kJSRegexpStaticOffsetsVectorSize) { |
| 689 | register_array_ = NewArray<int32_t>(register_array_size_); |
| 690 | } else { |
| 691 | register_array_ = isolate->jsregexp_static_offsets_vector(); |
| 692 | } |
| 693 | |
| 694 | // Set state so that fetching the results the first time triggers a call |
| 695 | // to the compiled regexp. |
| 696 | current_match_index_ = max_matches_ - 1; |
| 697 | num_matches_ = max_matches_; |
| 698 | DCHECK(registers_per_match_ >= 2); // Each match has at least one capture. |
| 699 | DCHECK_GE(register_array_size_, registers_per_match_); |
| 700 | int32_t* last_match = |
| 701 | ®ister_array_[current_match_index_ * registers_per_match_]; |
| 702 | last_match[0] = -1; |
| 703 | last_match[1] = 0; |
| 704 | } |
| 705 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 706 | int RegExpImpl::GlobalCache::AdvanceZeroLength(int last_index) { |
| 707 | if ((regexp_->GetFlags() & JSRegExp::kUnicode) != 0 && |
| 708 | last_index + 1 < subject_->length() && |
| 709 | unibrow::Utf16::IsLeadSurrogate(subject_->Get(last_index)) && |
| 710 | unibrow::Utf16::IsTrailSurrogate(subject_->Get(last_index + 1))) { |
| 711 | // Advance over the surrogate pair. |
| 712 | return last_index + 2; |
| 713 | } |
| 714 | return last_index + 1; |
| 715 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 716 | |
| 717 | // ------------------------------------------------------------------- |
| 718 | // Implementation of the Irregexp regular expression engine. |
| 719 | // |
| 720 | // The Irregexp regular expression engine is intended to be a complete |
| 721 | // implementation of ECMAScript regular expressions. It generates either |
| 722 | // bytecodes or native code. |
| 723 | |
| 724 | // The Irregexp regexp engine is structured in three steps. |
| 725 | // 1) The parser generates an abstract syntax tree. See ast.cc. |
| 726 | // 2) From the AST a node network is created. The nodes are all |
| 727 | // subclasses of RegExpNode. The nodes represent states when |
| 728 | // executing a regular expression. Several optimizations are |
| 729 | // performed on the node network. |
| 730 | // 3) From the nodes we generate either byte codes or native code |
| 731 | // that can actually execute the regular expression (perform |
| 732 | // the search). The code generation step is described in more |
| 733 | // detail below. |
| 734 | |
| 735 | // Code generation. |
| 736 | // |
| 737 | // The nodes are divided into four main categories. |
| 738 | // * Choice nodes |
| 739 | // These represent places where the regular expression can |
| 740 | // match in more than one way. For example on entry to an |
| 741 | // alternation (foo|bar) or a repetition (*, +, ? or {}). |
| 742 | // * Action nodes |
| 743 | // These represent places where some action should be |
| 744 | // performed. Examples include recording the current position |
| 745 | // in the input string to a register (in order to implement |
| 746 | // captures) or other actions on register for example in order |
| 747 | // to implement the counters needed for {} repetitions. |
| 748 | // * Matching nodes |
| 749 | // These attempt to match some element part of the input string. |
| 750 | // Examples of elements include character classes, plain strings |
| 751 | // or back references. |
| 752 | // * End nodes |
| 753 | // These are used to implement the actions required on finding |
| 754 | // a successful match or failing to find a match. |
| 755 | // |
| 756 | // The code generated (whether as byte codes or native code) maintains |
| 757 | // some state as it runs. This consists of the following elements: |
| 758 | // |
| 759 | // * The capture registers. Used for string captures. |
| 760 | // * Other registers. Used for counters etc. |
| 761 | // * The current position. |
| 762 | // * The stack of backtracking information. Used when a matching node |
| 763 | // fails to find a match and needs to try an alternative. |
| 764 | // |
| 765 | // Conceptual regular expression execution model: |
| 766 | // |
| 767 | // There is a simple conceptual model of regular expression execution |
| 768 | // which will be presented first. The actual code generated is a more |
| 769 | // efficient simulation of the simple conceptual model: |
| 770 | // |
| 771 | // * Choice nodes are implemented as follows: |
| 772 | // For each choice except the last { |
| 773 | // push current position |
| 774 | // push backtrack code location |
| 775 | // <generate code to test for choice> |
| 776 | // backtrack code location: |
| 777 | // pop current position |
| 778 | // } |
| 779 | // <generate code to test for last choice> |
| 780 | // |
| 781 | // * Actions nodes are generated as follows |
| 782 | // <push affected registers on backtrack stack> |
| 783 | // <generate code to perform action> |
| 784 | // push backtrack code location |
| 785 | // <generate code to test for following nodes> |
| 786 | // backtrack code location: |
| 787 | // <pop affected registers to restore their state> |
| 788 | // <pop backtrack location from stack and go to it> |
| 789 | // |
| 790 | // * Matching nodes are generated as follows: |
| 791 | // if input string matches at current position |
| 792 | // update current position |
| 793 | // <generate code to test for following nodes> |
| 794 | // else |
| 795 | // <pop backtrack location from stack and go to it> |
| 796 | // |
| 797 | // Thus it can be seen that the current position is saved and restored |
| 798 | // by the choice nodes, whereas the registers are saved and restored by |
| 799 | // by the action nodes that manipulate them. |
| 800 | // |
| 801 | // The other interesting aspect of this model is that nodes are generated |
| 802 | // at the point where they are needed by a recursive call to Emit(). If |
| 803 | // the node has already been code generated then the Emit() call will |
| 804 | // generate a jump to the previously generated code instead. In order to |
| 805 | // limit recursion it is possible for the Emit() function to put the node |
| 806 | // on a work list for later generation and instead generate a jump. The |
| 807 | // destination of the jump is resolved later when the code is generated. |
| 808 | // |
| 809 | // Actual regular expression code generation. |
| 810 | // |
| 811 | // Code generation is actually more complicated than the above. In order |
| 812 | // to improve the efficiency of the generated code some optimizations are |
| 813 | // performed |
| 814 | // |
| 815 | // * Choice nodes have 1-character lookahead. |
| 816 | // A choice node looks at the following character and eliminates some of |
| 817 | // the choices immediately based on that character. This is not yet |
| 818 | // implemented. |
| 819 | // * Simple greedy loops store reduced backtracking information. |
| 820 | // A quantifier like /.*foo/m will greedily match the whole input. It will |
| 821 | // then need to backtrack to a point where it can match "foo". The naive |
| 822 | // implementation of this would push each character position onto the |
| 823 | // backtracking stack, then pop them off one by one. This would use space |
| 824 | // proportional to the length of the input string. However since the "." |
| 825 | // can only match in one way and always has a constant length (in this case |
| 826 | // of 1) it suffices to store the current position on the top of the stack |
| 827 | // once. Matching now becomes merely incrementing the current position and |
| 828 | // backtracking becomes decrementing the current position and checking the |
| 829 | // result against the stored current position. This is faster and saves |
| 830 | // space. |
| 831 | // * The current state is virtualized. |
| 832 | // This is used to defer expensive operations until it is clear that they |
| 833 | // are needed and to generate code for a node more than once, allowing |
| 834 | // specialized an efficient versions of the code to be created. This is |
| 835 | // explained in the section below. |
| 836 | // |
| 837 | // Execution state virtualization. |
| 838 | // |
| 839 | // Instead of emitting code, nodes that manipulate the state can record their |
| 840 | // manipulation in an object called the Trace. The Trace object can record a |
| 841 | // current position offset, an optional backtrack code location on the top of |
| 842 | // the virtualized backtrack stack and some register changes. When a node is |
| 843 | // to be emitted it can flush the Trace or update it. Flushing the Trace |
| 844 | // will emit code to bring the actual state into line with the virtual state. |
| 845 | // Avoiding flushing the state can postpone some work (e.g. updates of capture |
| 846 | // registers). Postponing work can save time when executing the regular |
| 847 | // expression since it may be found that the work never has to be done as a |
| 848 | // failure to match can occur. In addition it is much faster to jump to a |
| 849 | // known backtrack code location than it is to pop an unknown backtrack |
| 850 | // location from the stack and jump there. |
| 851 | // |
| 852 | // The virtual state found in the Trace affects code generation. For example |
| 853 | // the virtual state contains the difference between the actual current |
| 854 | // position and the virtual current position, and matching code needs to use |
| 855 | // this offset to attempt a match in the correct location of the input |
| 856 | // string. Therefore code generated for a non-trivial trace is specialized |
| 857 | // to that trace. The code generator therefore has the ability to generate |
| 858 | // code for each node several times. In order to limit the size of the |
| 859 | // generated code there is an arbitrary limit on how many specialized sets of |
| 860 | // code may be generated for a given node. If the limit is reached, the |
| 861 | // trace is flushed and a generic version of the code for a node is emitted. |
| 862 | // This is subsequently used for that node. The code emitted for non-generic |
| 863 | // trace is not recorded in the node and so it cannot currently be reused in |
| 864 | // the event that code generation is requested for an identical trace. |
| 865 | |
| 866 | |
| 867 | void RegExpTree::AppendToText(RegExpText* text, Zone* zone) { |
| 868 | UNREACHABLE(); |
| 869 | } |
| 870 | |
| 871 | |
| 872 | void RegExpAtom::AppendToText(RegExpText* text, Zone* zone) { |
| 873 | text->AddElement(TextElement::Atom(this), zone); |
| 874 | } |
| 875 | |
| 876 | |
| 877 | void RegExpCharacterClass::AppendToText(RegExpText* text, Zone* zone) { |
| 878 | text->AddElement(TextElement::CharClass(this), zone); |
| 879 | } |
| 880 | |
| 881 | |
| 882 | void RegExpText::AppendToText(RegExpText* text, Zone* zone) { |
| 883 | for (int i = 0; i < elements()->length(); i++) |
| 884 | text->AddElement(elements()->at(i), zone); |
| 885 | } |
| 886 | |
| 887 | |
| 888 | TextElement TextElement::Atom(RegExpAtom* atom) { |
| 889 | return TextElement(ATOM, atom); |
| 890 | } |
| 891 | |
| 892 | |
| 893 | TextElement TextElement::CharClass(RegExpCharacterClass* char_class) { |
| 894 | return TextElement(CHAR_CLASS, char_class); |
| 895 | } |
| 896 | |
| 897 | |
| 898 | int TextElement::length() const { |
| 899 | switch (text_type()) { |
| 900 | case ATOM: |
| 901 | return atom()->length(); |
| 902 | |
| 903 | case CHAR_CLASS: |
| 904 | return 1; |
| 905 | } |
| 906 | UNREACHABLE(); |
| 907 | return 0; |
| 908 | } |
| 909 | |
| 910 | |
| 911 | DispatchTable* ChoiceNode::GetTable(bool ignore_case) { |
| 912 | if (table_ == NULL) { |
| 913 | table_ = new(zone()) DispatchTable(zone()); |
| 914 | DispatchTableConstructor cons(table_, ignore_case, zone()); |
| 915 | cons.BuildTable(this); |
| 916 | } |
| 917 | return table_; |
| 918 | } |
| 919 | |
| 920 | |
| 921 | class FrequencyCollator { |
| 922 | public: |
| 923 | FrequencyCollator() : total_samples_(0) { |
| 924 | for (int i = 0; i < RegExpMacroAssembler::kTableSize; i++) { |
| 925 | frequencies_[i] = CharacterFrequency(i); |
| 926 | } |
| 927 | } |
| 928 | |
| 929 | void CountCharacter(int character) { |
| 930 | int index = (character & RegExpMacroAssembler::kTableMask); |
| 931 | frequencies_[index].Increment(); |
| 932 | total_samples_++; |
| 933 | } |
| 934 | |
| 935 | // Does not measure in percent, but rather per-128 (the table size from the |
| 936 | // regexp macro assembler). |
| 937 | int Frequency(int in_character) { |
| 938 | DCHECK((in_character & RegExpMacroAssembler::kTableMask) == in_character); |
| 939 | if (total_samples_ < 1) return 1; // Division by zero. |
| 940 | int freq_in_per128 = |
| 941 | (frequencies_[in_character].counter() * 128) / total_samples_; |
| 942 | return freq_in_per128; |
| 943 | } |
| 944 | |
| 945 | private: |
| 946 | class CharacterFrequency { |
| 947 | public: |
| 948 | CharacterFrequency() : counter_(0), character_(-1) { } |
| 949 | explicit CharacterFrequency(int character) |
| 950 | : counter_(0), character_(character) { } |
| 951 | |
| 952 | void Increment() { counter_++; } |
| 953 | int counter() { return counter_; } |
| 954 | int character() { return character_; } |
| 955 | |
| 956 | private: |
| 957 | int counter_; |
| 958 | int character_; |
| 959 | }; |
| 960 | |
| 961 | |
| 962 | private: |
| 963 | CharacterFrequency frequencies_[RegExpMacroAssembler::kTableSize]; |
| 964 | int total_samples_; |
| 965 | }; |
| 966 | |
| 967 | |
| 968 | class RegExpCompiler { |
| 969 | public: |
| 970 | RegExpCompiler(Isolate* isolate, Zone* zone, int capture_count, |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 971 | JSRegExp::Flags flags, bool is_one_byte); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 972 | |
| 973 | int AllocateRegister() { |
| 974 | if (next_register_ >= RegExpMacroAssembler::kMaxRegister) { |
| 975 | reg_exp_too_big_ = true; |
| 976 | return next_register_; |
| 977 | } |
| 978 | return next_register_++; |
| 979 | } |
| 980 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 981 | // Lookarounds to match lone surrogates for unicode character class matches |
| 982 | // are never nested. We can therefore reuse registers. |
| 983 | int UnicodeLookaroundStackRegister() { |
| 984 | if (unicode_lookaround_stack_register_ == kNoRegister) { |
| 985 | unicode_lookaround_stack_register_ = AllocateRegister(); |
| 986 | } |
| 987 | return unicode_lookaround_stack_register_; |
| 988 | } |
| 989 | |
| 990 | int UnicodeLookaroundPositionRegister() { |
| 991 | if (unicode_lookaround_position_register_ == kNoRegister) { |
| 992 | unicode_lookaround_position_register_ = AllocateRegister(); |
| 993 | } |
| 994 | return unicode_lookaround_position_register_; |
| 995 | } |
| 996 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 997 | RegExpEngine::CompilationResult Assemble(RegExpMacroAssembler* assembler, |
| 998 | RegExpNode* start, |
| 999 | int capture_count, |
| 1000 | Handle<String> pattern); |
| 1001 | |
| 1002 | inline void AddWork(RegExpNode* node) { |
| 1003 | if (!node->on_work_list() && !node->label()->is_bound()) { |
| 1004 | node->set_on_work_list(true); |
| 1005 | work_list_->Add(node); |
| 1006 | } |
| 1007 | } |
| 1008 | |
| 1009 | static const int kImplementationOffset = 0; |
| 1010 | static const int kNumberOfRegistersOffset = 0; |
| 1011 | static const int kCodeOffset = 1; |
| 1012 | |
| 1013 | RegExpMacroAssembler* macro_assembler() { return macro_assembler_; } |
| 1014 | EndNode* accept() { return accept_; } |
| 1015 | |
| 1016 | static const int kMaxRecursion = 100; |
| 1017 | inline int recursion_depth() { return recursion_depth_; } |
| 1018 | inline void IncrementRecursionDepth() { recursion_depth_++; } |
| 1019 | inline void DecrementRecursionDepth() { recursion_depth_--; } |
| 1020 | |
| 1021 | void SetRegExpTooBig() { reg_exp_too_big_ = true; } |
| 1022 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1023 | inline bool ignore_case() { return (flags_ & JSRegExp::kIgnoreCase) != 0; } |
| 1024 | inline bool unicode() { return (flags_ & JSRegExp::kUnicode) != 0; } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1025 | inline bool one_byte() { return one_byte_; } |
| 1026 | inline bool optimize() { return optimize_; } |
| 1027 | inline void set_optimize(bool value) { optimize_ = value; } |
| 1028 | inline bool limiting_recursion() { return limiting_recursion_; } |
| 1029 | inline void set_limiting_recursion(bool value) { |
| 1030 | limiting_recursion_ = value; |
| 1031 | } |
| 1032 | bool read_backward() { return read_backward_; } |
| 1033 | void set_read_backward(bool value) { read_backward_ = value; } |
| 1034 | FrequencyCollator* frequency_collator() { return &frequency_collator_; } |
| 1035 | |
| 1036 | int current_expansion_factor() { return current_expansion_factor_; } |
| 1037 | void set_current_expansion_factor(int value) { |
| 1038 | current_expansion_factor_ = value; |
| 1039 | } |
| 1040 | |
| 1041 | Isolate* isolate() const { return isolate_; } |
| 1042 | Zone* zone() const { return zone_; } |
| 1043 | |
| 1044 | static const int kNoRegister = -1; |
| 1045 | |
| 1046 | private: |
| 1047 | EndNode* accept_; |
| 1048 | int next_register_; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1049 | int unicode_lookaround_stack_register_; |
| 1050 | int unicode_lookaround_position_register_; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1051 | List<RegExpNode*>* work_list_; |
| 1052 | int recursion_depth_; |
| 1053 | RegExpMacroAssembler* macro_assembler_; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1054 | JSRegExp::Flags flags_; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1055 | bool one_byte_; |
| 1056 | bool reg_exp_too_big_; |
| 1057 | bool limiting_recursion_; |
| 1058 | bool optimize_; |
| 1059 | bool read_backward_; |
| 1060 | int current_expansion_factor_; |
| 1061 | FrequencyCollator frequency_collator_; |
| 1062 | Isolate* isolate_; |
| 1063 | Zone* zone_; |
| 1064 | }; |
| 1065 | |
| 1066 | |
| 1067 | class RecursionCheck { |
| 1068 | public: |
| 1069 | explicit RecursionCheck(RegExpCompiler* compiler) : compiler_(compiler) { |
| 1070 | compiler->IncrementRecursionDepth(); |
| 1071 | } |
| 1072 | ~RecursionCheck() { compiler_->DecrementRecursionDepth(); } |
| 1073 | private: |
| 1074 | RegExpCompiler* compiler_; |
| 1075 | }; |
| 1076 | |
| 1077 | |
| 1078 | static RegExpEngine::CompilationResult IrregexpRegExpTooBig(Isolate* isolate) { |
| 1079 | return RegExpEngine::CompilationResult(isolate, "RegExp too big"); |
| 1080 | } |
| 1081 | |
| 1082 | |
| 1083 | // Attempts to compile the regexp using an Irregexp code generator. Returns |
| 1084 | // a fixed array or a null handle depending on whether it succeeded. |
| 1085 | RegExpCompiler::RegExpCompiler(Isolate* isolate, Zone* zone, int capture_count, |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1086 | JSRegExp::Flags flags, bool one_byte) |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1087 | : next_register_(2 * (capture_count + 1)), |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1088 | unicode_lookaround_stack_register_(kNoRegister), |
| 1089 | unicode_lookaround_position_register_(kNoRegister), |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1090 | work_list_(NULL), |
| 1091 | recursion_depth_(0), |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1092 | flags_(flags), |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1093 | one_byte_(one_byte), |
| 1094 | reg_exp_too_big_(false), |
| 1095 | limiting_recursion_(false), |
| 1096 | optimize_(FLAG_regexp_optimization), |
| 1097 | read_backward_(false), |
| 1098 | current_expansion_factor_(1), |
| 1099 | frequency_collator_(), |
| 1100 | isolate_(isolate), |
| 1101 | zone_(zone) { |
| 1102 | accept_ = new(zone) EndNode(EndNode::ACCEPT, zone); |
| 1103 | DCHECK(next_register_ - 1 <= RegExpMacroAssembler::kMaxRegister); |
| 1104 | } |
| 1105 | |
| 1106 | |
| 1107 | RegExpEngine::CompilationResult RegExpCompiler::Assemble( |
| 1108 | RegExpMacroAssembler* macro_assembler, |
| 1109 | RegExpNode* start, |
| 1110 | int capture_count, |
| 1111 | Handle<String> pattern) { |
| 1112 | Heap* heap = pattern->GetHeap(); |
| 1113 | |
| 1114 | #ifdef DEBUG |
| 1115 | if (FLAG_trace_regexp_assembler) |
| 1116 | macro_assembler_ = |
| 1117 | new RegExpMacroAssemblerTracer(isolate(), macro_assembler); |
| 1118 | else |
| 1119 | #endif |
| 1120 | macro_assembler_ = macro_assembler; |
| 1121 | |
| 1122 | List <RegExpNode*> work_list(0); |
| 1123 | work_list_ = &work_list; |
| 1124 | Label fail; |
| 1125 | macro_assembler_->PushBacktrack(&fail); |
| 1126 | Trace new_trace; |
| 1127 | start->Emit(this, &new_trace); |
| 1128 | macro_assembler_->Bind(&fail); |
| 1129 | macro_assembler_->Fail(); |
| 1130 | while (!work_list.is_empty()) { |
| 1131 | RegExpNode* node = work_list.RemoveLast(); |
| 1132 | node->set_on_work_list(false); |
| 1133 | if (!node->label()->is_bound()) node->Emit(this, &new_trace); |
| 1134 | } |
| 1135 | if (reg_exp_too_big_) { |
| 1136 | macro_assembler_->AbortedCodeGeneration(); |
| 1137 | return IrregexpRegExpTooBig(isolate_); |
| 1138 | } |
| 1139 | |
| 1140 | Handle<HeapObject> code = macro_assembler_->GetCode(pattern); |
| 1141 | heap->IncreaseTotalRegexpCodeGenerated(code->Size()); |
| 1142 | work_list_ = NULL; |
| 1143 | #ifdef ENABLE_DISASSEMBLER |
| 1144 | if (FLAG_print_code) { |
| 1145 | CodeTracer::Scope trace_scope(heap->isolate()->GetCodeTracer()); |
| 1146 | OFStream os(trace_scope.file()); |
| 1147 | Handle<Code>::cast(code)->Disassemble(pattern->ToCString().get(), os); |
| 1148 | } |
| 1149 | #endif |
| 1150 | #ifdef DEBUG |
| 1151 | if (FLAG_trace_regexp_assembler) { |
| 1152 | delete macro_assembler_; |
| 1153 | } |
| 1154 | #endif |
| 1155 | return RegExpEngine::CompilationResult(*code, next_register_); |
| 1156 | } |
| 1157 | |
| 1158 | |
| 1159 | bool Trace::DeferredAction::Mentions(int that) { |
| 1160 | if (action_type() == ActionNode::CLEAR_CAPTURES) { |
| 1161 | Interval range = static_cast<DeferredClearCaptures*>(this)->range(); |
| 1162 | return range.Contains(that); |
| 1163 | } else { |
| 1164 | return reg() == that; |
| 1165 | } |
| 1166 | } |
| 1167 | |
| 1168 | |
| 1169 | bool Trace::mentions_reg(int reg) { |
| 1170 | for (DeferredAction* action = actions_; |
| 1171 | action != NULL; |
| 1172 | action = action->next()) { |
| 1173 | if (action->Mentions(reg)) |
| 1174 | return true; |
| 1175 | } |
| 1176 | return false; |
| 1177 | } |
| 1178 | |
| 1179 | |
| 1180 | bool Trace::GetStoredPosition(int reg, int* cp_offset) { |
| 1181 | DCHECK_EQ(0, *cp_offset); |
| 1182 | for (DeferredAction* action = actions_; |
| 1183 | action != NULL; |
| 1184 | action = action->next()) { |
| 1185 | if (action->Mentions(reg)) { |
| 1186 | if (action->action_type() == ActionNode::STORE_POSITION) { |
| 1187 | *cp_offset = static_cast<DeferredCapture*>(action)->cp_offset(); |
| 1188 | return true; |
| 1189 | } else { |
| 1190 | return false; |
| 1191 | } |
| 1192 | } |
| 1193 | } |
| 1194 | return false; |
| 1195 | } |
| 1196 | |
| 1197 | |
| 1198 | int Trace::FindAffectedRegisters(OutSet* affected_registers, |
| 1199 | Zone* zone) { |
| 1200 | int max_register = RegExpCompiler::kNoRegister; |
| 1201 | for (DeferredAction* action = actions_; |
| 1202 | action != NULL; |
| 1203 | action = action->next()) { |
| 1204 | if (action->action_type() == ActionNode::CLEAR_CAPTURES) { |
| 1205 | Interval range = static_cast<DeferredClearCaptures*>(action)->range(); |
| 1206 | for (int i = range.from(); i <= range.to(); i++) |
| 1207 | affected_registers->Set(i, zone); |
| 1208 | if (range.to() > max_register) max_register = range.to(); |
| 1209 | } else { |
| 1210 | affected_registers->Set(action->reg(), zone); |
| 1211 | if (action->reg() > max_register) max_register = action->reg(); |
| 1212 | } |
| 1213 | } |
| 1214 | return max_register; |
| 1215 | } |
| 1216 | |
| 1217 | |
| 1218 | void Trace::RestoreAffectedRegisters(RegExpMacroAssembler* assembler, |
| 1219 | int max_register, |
| 1220 | const OutSet& registers_to_pop, |
| 1221 | const OutSet& registers_to_clear) { |
| 1222 | for (int reg = max_register; reg >= 0; reg--) { |
| 1223 | if (registers_to_pop.Get(reg)) { |
| 1224 | assembler->PopRegister(reg); |
| 1225 | } else if (registers_to_clear.Get(reg)) { |
| 1226 | int clear_to = reg; |
| 1227 | while (reg > 0 && registers_to_clear.Get(reg - 1)) { |
| 1228 | reg--; |
| 1229 | } |
| 1230 | assembler->ClearRegisters(reg, clear_to); |
| 1231 | } |
| 1232 | } |
| 1233 | } |
| 1234 | |
| 1235 | |
| 1236 | void Trace::PerformDeferredActions(RegExpMacroAssembler* assembler, |
| 1237 | int max_register, |
| 1238 | const OutSet& affected_registers, |
| 1239 | OutSet* registers_to_pop, |
| 1240 | OutSet* registers_to_clear, |
| 1241 | Zone* zone) { |
| 1242 | // The "+1" is to avoid a push_limit of zero if stack_limit_slack() is 1. |
| 1243 | const int push_limit = (assembler->stack_limit_slack() + 1) / 2; |
| 1244 | |
| 1245 | // Count pushes performed to force a stack limit check occasionally. |
| 1246 | int pushes = 0; |
| 1247 | |
| 1248 | for (int reg = 0; reg <= max_register; reg++) { |
| 1249 | if (!affected_registers.Get(reg)) { |
| 1250 | continue; |
| 1251 | } |
| 1252 | |
| 1253 | // The chronologically first deferred action in the trace |
| 1254 | // is used to infer the action needed to restore a register |
| 1255 | // to its previous state (or not, if it's safe to ignore it). |
| 1256 | enum DeferredActionUndoType { IGNORE, RESTORE, CLEAR }; |
| 1257 | DeferredActionUndoType undo_action = IGNORE; |
| 1258 | |
| 1259 | int value = 0; |
| 1260 | bool absolute = false; |
| 1261 | bool clear = false; |
| 1262 | static const int kNoStore = kMinInt; |
| 1263 | int store_position = kNoStore; |
| 1264 | // This is a little tricky because we are scanning the actions in reverse |
| 1265 | // historical order (newest first). |
| 1266 | for (DeferredAction* action = actions_; |
| 1267 | action != NULL; |
| 1268 | action = action->next()) { |
| 1269 | if (action->Mentions(reg)) { |
| 1270 | switch (action->action_type()) { |
| 1271 | case ActionNode::SET_REGISTER: { |
| 1272 | Trace::DeferredSetRegister* psr = |
| 1273 | static_cast<Trace::DeferredSetRegister*>(action); |
| 1274 | if (!absolute) { |
| 1275 | value += psr->value(); |
| 1276 | absolute = true; |
| 1277 | } |
| 1278 | // SET_REGISTER is currently only used for newly introduced loop |
| 1279 | // counters. They can have a significant previous value if they |
| 1280 | // occour in a loop. TODO(lrn): Propagate this information, so |
| 1281 | // we can set undo_action to IGNORE if we know there is no value to |
| 1282 | // restore. |
| 1283 | undo_action = RESTORE; |
| 1284 | DCHECK_EQ(store_position, kNoStore); |
| 1285 | DCHECK(!clear); |
| 1286 | break; |
| 1287 | } |
| 1288 | case ActionNode::INCREMENT_REGISTER: |
| 1289 | if (!absolute) { |
| 1290 | value++; |
| 1291 | } |
| 1292 | DCHECK_EQ(store_position, kNoStore); |
| 1293 | DCHECK(!clear); |
| 1294 | undo_action = RESTORE; |
| 1295 | break; |
| 1296 | case ActionNode::STORE_POSITION: { |
| 1297 | Trace::DeferredCapture* pc = |
| 1298 | static_cast<Trace::DeferredCapture*>(action); |
| 1299 | if (!clear && store_position == kNoStore) { |
| 1300 | store_position = pc->cp_offset(); |
| 1301 | } |
| 1302 | |
| 1303 | // For captures we know that stores and clears alternate. |
| 1304 | // Other register, are never cleared, and if the occur |
| 1305 | // inside a loop, they might be assigned more than once. |
| 1306 | if (reg <= 1) { |
| 1307 | // Registers zero and one, aka "capture zero", is |
| 1308 | // always set correctly if we succeed. There is no |
| 1309 | // need to undo a setting on backtrack, because we |
| 1310 | // will set it again or fail. |
| 1311 | undo_action = IGNORE; |
| 1312 | } else { |
| 1313 | undo_action = pc->is_capture() ? CLEAR : RESTORE; |
| 1314 | } |
| 1315 | DCHECK(!absolute); |
| 1316 | DCHECK_EQ(value, 0); |
| 1317 | break; |
| 1318 | } |
| 1319 | case ActionNode::CLEAR_CAPTURES: { |
| 1320 | // Since we're scanning in reverse order, if we've already |
| 1321 | // set the position we have to ignore historically earlier |
| 1322 | // clearing operations. |
| 1323 | if (store_position == kNoStore) { |
| 1324 | clear = true; |
| 1325 | } |
| 1326 | undo_action = RESTORE; |
| 1327 | DCHECK(!absolute); |
| 1328 | DCHECK_EQ(value, 0); |
| 1329 | break; |
| 1330 | } |
| 1331 | default: |
| 1332 | UNREACHABLE(); |
| 1333 | break; |
| 1334 | } |
| 1335 | } |
| 1336 | } |
| 1337 | // Prepare for the undo-action (e.g., push if it's going to be popped). |
| 1338 | if (undo_action == RESTORE) { |
| 1339 | pushes++; |
| 1340 | RegExpMacroAssembler::StackCheckFlag stack_check = |
| 1341 | RegExpMacroAssembler::kNoStackLimitCheck; |
| 1342 | if (pushes == push_limit) { |
| 1343 | stack_check = RegExpMacroAssembler::kCheckStackLimit; |
| 1344 | pushes = 0; |
| 1345 | } |
| 1346 | |
| 1347 | assembler->PushRegister(reg, stack_check); |
| 1348 | registers_to_pop->Set(reg, zone); |
| 1349 | } else if (undo_action == CLEAR) { |
| 1350 | registers_to_clear->Set(reg, zone); |
| 1351 | } |
| 1352 | // Perform the chronologically last action (or accumulated increment) |
| 1353 | // for the register. |
| 1354 | if (store_position != kNoStore) { |
| 1355 | assembler->WriteCurrentPositionToRegister(reg, store_position); |
| 1356 | } else if (clear) { |
| 1357 | assembler->ClearRegisters(reg, reg); |
| 1358 | } else if (absolute) { |
| 1359 | assembler->SetRegister(reg, value); |
| 1360 | } else if (value != 0) { |
| 1361 | assembler->AdvanceRegister(reg, value); |
| 1362 | } |
| 1363 | } |
| 1364 | } |
| 1365 | |
| 1366 | |
| 1367 | // This is called as we come into a loop choice node and some other tricky |
| 1368 | // nodes. It normalizes the state of the code generator to ensure we can |
| 1369 | // generate generic code. |
| 1370 | void Trace::Flush(RegExpCompiler* compiler, RegExpNode* successor) { |
| 1371 | RegExpMacroAssembler* assembler = compiler->macro_assembler(); |
| 1372 | |
| 1373 | DCHECK(!is_trivial()); |
| 1374 | |
| 1375 | if (actions_ == NULL && backtrack() == NULL) { |
| 1376 | // Here we just have some deferred cp advances to fix and we are back to |
| 1377 | // a normal situation. We may also have to forget some information gained |
| 1378 | // through a quick check that was already performed. |
| 1379 | if (cp_offset_ != 0) assembler->AdvanceCurrentPosition(cp_offset_); |
| 1380 | // Create a new trivial state and generate the node with that. |
| 1381 | Trace new_state; |
| 1382 | successor->Emit(compiler, &new_state); |
| 1383 | return; |
| 1384 | } |
| 1385 | |
| 1386 | // Generate deferred actions here along with code to undo them again. |
| 1387 | OutSet affected_registers; |
| 1388 | |
| 1389 | if (backtrack() != NULL) { |
| 1390 | // Here we have a concrete backtrack location. These are set up by choice |
| 1391 | // nodes and so they indicate that we have a deferred save of the current |
| 1392 | // position which we may need to emit here. |
| 1393 | assembler->PushCurrentPosition(); |
| 1394 | } |
| 1395 | |
| 1396 | int max_register = FindAffectedRegisters(&affected_registers, |
| 1397 | compiler->zone()); |
| 1398 | OutSet registers_to_pop; |
| 1399 | OutSet registers_to_clear; |
| 1400 | PerformDeferredActions(assembler, |
| 1401 | max_register, |
| 1402 | affected_registers, |
| 1403 | ®isters_to_pop, |
| 1404 | ®isters_to_clear, |
| 1405 | compiler->zone()); |
| 1406 | if (cp_offset_ != 0) { |
| 1407 | assembler->AdvanceCurrentPosition(cp_offset_); |
| 1408 | } |
| 1409 | |
| 1410 | // Create a new trivial state and generate the node with that. |
| 1411 | Label undo; |
| 1412 | assembler->PushBacktrack(&undo); |
| 1413 | if (successor->KeepRecursing(compiler)) { |
| 1414 | Trace new_state; |
| 1415 | successor->Emit(compiler, &new_state); |
| 1416 | } else { |
| 1417 | compiler->AddWork(successor); |
| 1418 | assembler->GoTo(successor->label()); |
| 1419 | } |
| 1420 | |
| 1421 | // On backtrack we need to restore state. |
| 1422 | assembler->Bind(&undo); |
| 1423 | RestoreAffectedRegisters(assembler, |
| 1424 | max_register, |
| 1425 | registers_to_pop, |
| 1426 | registers_to_clear); |
| 1427 | if (backtrack() == NULL) { |
| 1428 | assembler->Backtrack(); |
| 1429 | } else { |
| 1430 | assembler->PopCurrentPosition(); |
| 1431 | assembler->GoTo(backtrack()); |
| 1432 | } |
| 1433 | } |
| 1434 | |
| 1435 | |
| 1436 | void NegativeSubmatchSuccess::Emit(RegExpCompiler* compiler, Trace* trace) { |
| 1437 | RegExpMacroAssembler* assembler = compiler->macro_assembler(); |
| 1438 | |
| 1439 | // Omit flushing the trace. We discard the entire stack frame anyway. |
| 1440 | |
| 1441 | if (!label()->is_bound()) { |
| 1442 | // We are completely independent of the trace, since we ignore it, |
| 1443 | // so this code can be used as the generic version. |
| 1444 | assembler->Bind(label()); |
| 1445 | } |
| 1446 | |
| 1447 | // Throw away everything on the backtrack stack since the start |
| 1448 | // of the negative submatch and restore the character position. |
| 1449 | assembler->ReadCurrentPositionFromRegister(current_position_register_); |
| 1450 | assembler->ReadStackPointerFromRegister(stack_pointer_register_); |
| 1451 | if (clear_capture_count_ > 0) { |
| 1452 | // Clear any captures that might have been performed during the success |
| 1453 | // of the body of the negative look-ahead. |
| 1454 | int clear_capture_end = clear_capture_start_ + clear_capture_count_ - 1; |
| 1455 | assembler->ClearRegisters(clear_capture_start_, clear_capture_end); |
| 1456 | } |
| 1457 | // Now that we have unwound the stack we find at the top of the stack the |
| 1458 | // backtrack that the BeginSubmatch node got. |
| 1459 | assembler->Backtrack(); |
| 1460 | } |
| 1461 | |
| 1462 | |
| 1463 | void EndNode::Emit(RegExpCompiler* compiler, Trace* trace) { |
| 1464 | if (!trace->is_trivial()) { |
| 1465 | trace->Flush(compiler, this); |
| 1466 | return; |
| 1467 | } |
| 1468 | RegExpMacroAssembler* assembler = compiler->macro_assembler(); |
| 1469 | if (!label()->is_bound()) { |
| 1470 | assembler->Bind(label()); |
| 1471 | } |
| 1472 | switch (action_) { |
| 1473 | case ACCEPT: |
| 1474 | assembler->Succeed(); |
| 1475 | return; |
| 1476 | case BACKTRACK: |
| 1477 | assembler->GoTo(trace->backtrack()); |
| 1478 | return; |
| 1479 | case NEGATIVE_SUBMATCH_SUCCESS: |
| 1480 | // This case is handled in a different virtual method. |
| 1481 | UNREACHABLE(); |
| 1482 | } |
| 1483 | UNIMPLEMENTED(); |
| 1484 | } |
| 1485 | |
| 1486 | |
| 1487 | void GuardedAlternative::AddGuard(Guard* guard, Zone* zone) { |
| 1488 | if (guards_ == NULL) |
| 1489 | guards_ = new(zone) ZoneList<Guard*>(1, zone); |
| 1490 | guards_->Add(guard, zone); |
| 1491 | } |
| 1492 | |
| 1493 | |
| 1494 | ActionNode* ActionNode::SetRegister(int reg, |
| 1495 | int val, |
| 1496 | RegExpNode* on_success) { |
| 1497 | ActionNode* result = |
| 1498 | new(on_success->zone()) ActionNode(SET_REGISTER, on_success); |
| 1499 | result->data_.u_store_register.reg = reg; |
| 1500 | result->data_.u_store_register.value = val; |
| 1501 | return result; |
| 1502 | } |
| 1503 | |
| 1504 | |
| 1505 | ActionNode* ActionNode::IncrementRegister(int reg, RegExpNode* on_success) { |
| 1506 | ActionNode* result = |
| 1507 | new(on_success->zone()) ActionNode(INCREMENT_REGISTER, on_success); |
| 1508 | result->data_.u_increment_register.reg = reg; |
| 1509 | return result; |
| 1510 | } |
| 1511 | |
| 1512 | |
| 1513 | ActionNode* ActionNode::StorePosition(int reg, |
| 1514 | bool is_capture, |
| 1515 | RegExpNode* on_success) { |
| 1516 | ActionNode* result = |
| 1517 | new(on_success->zone()) ActionNode(STORE_POSITION, on_success); |
| 1518 | result->data_.u_position_register.reg = reg; |
| 1519 | result->data_.u_position_register.is_capture = is_capture; |
| 1520 | return result; |
| 1521 | } |
| 1522 | |
| 1523 | |
| 1524 | ActionNode* ActionNode::ClearCaptures(Interval range, |
| 1525 | RegExpNode* on_success) { |
| 1526 | ActionNode* result = |
| 1527 | new(on_success->zone()) ActionNode(CLEAR_CAPTURES, on_success); |
| 1528 | result->data_.u_clear_captures.range_from = range.from(); |
| 1529 | result->data_.u_clear_captures.range_to = range.to(); |
| 1530 | return result; |
| 1531 | } |
| 1532 | |
| 1533 | |
| 1534 | ActionNode* ActionNode::BeginSubmatch(int stack_reg, |
| 1535 | int position_reg, |
| 1536 | RegExpNode* on_success) { |
| 1537 | ActionNode* result = |
| 1538 | new(on_success->zone()) ActionNode(BEGIN_SUBMATCH, on_success); |
| 1539 | result->data_.u_submatch.stack_pointer_register = stack_reg; |
| 1540 | result->data_.u_submatch.current_position_register = position_reg; |
| 1541 | return result; |
| 1542 | } |
| 1543 | |
| 1544 | |
| 1545 | ActionNode* ActionNode::PositiveSubmatchSuccess(int stack_reg, |
| 1546 | int position_reg, |
| 1547 | int clear_register_count, |
| 1548 | int clear_register_from, |
| 1549 | RegExpNode* on_success) { |
| 1550 | ActionNode* result = |
| 1551 | new(on_success->zone()) ActionNode(POSITIVE_SUBMATCH_SUCCESS, on_success); |
| 1552 | result->data_.u_submatch.stack_pointer_register = stack_reg; |
| 1553 | result->data_.u_submatch.current_position_register = position_reg; |
| 1554 | result->data_.u_submatch.clear_register_count = clear_register_count; |
| 1555 | result->data_.u_submatch.clear_register_from = clear_register_from; |
| 1556 | return result; |
| 1557 | } |
| 1558 | |
| 1559 | |
| 1560 | ActionNode* ActionNode::EmptyMatchCheck(int start_register, |
| 1561 | int repetition_register, |
| 1562 | int repetition_limit, |
| 1563 | RegExpNode* on_success) { |
| 1564 | ActionNode* result = |
| 1565 | new(on_success->zone()) ActionNode(EMPTY_MATCH_CHECK, on_success); |
| 1566 | result->data_.u_empty_match_check.start_register = start_register; |
| 1567 | result->data_.u_empty_match_check.repetition_register = repetition_register; |
| 1568 | result->data_.u_empty_match_check.repetition_limit = repetition_limit; |
| 1569 | return result; |
| 1570 | } |
| 1571 | |
| 1572 | |
| 1573 | #define DEFINE_ACCEPT(Type) \ |
| 1574 | void Type##Node::Accept(NodeVisitor* visitor) { \ |
| 1575 | visitor->Visit##Type(this); \ |
| 1576 | } |
| 1577 | FOR_EACH_NODE_TYPE(DEFINE_ACCEPT) |
| 1578 | #undef DEFINE_ACCEPT |
| 1579 | |
| 1580 | |
| 1581 | void LoopChoiceNode::Accept(NodeVisitor* visitor) { |
| 1582 | visitor->VisitLoopChoice(this); |
| 1583 | } |
| 1584 | |
| 1585 | |
| 1586 | // ------------------------------------------------------------------- |
| 1587 | // Emit code. |
| 1588 | |
| 1589 | |
| 1590 | void ChoiceNode::GenerateGuard(RegExpMacroAssembler* macro_assembler, |
| 1591 | Guard* guard, |
| 1592 | Trace* trace) { |
| 1593 | switch (guard->op()) { |
| 1594 | case Guard::LT: |
| 1595 | DCHECK(!trace->mentions_reg(guard->reg())); |
| 1596 | macro_assembler->IfRegisterGE(guard->reg(), |
| 1597 | guard->value(), |
| 1598 | trace->backtrack()); |
| 1599 | break; |
| 1600 | case Guard::GEQ: |
| 1601 | DCHECK(!trace->mentions_reg(guard->reg())); |
| 1602 | macro_assembler->IfRegisterLT(guard->reg(), |
| 1603 | guard->value(), |
| 1604 | trace->backtrack()); |
| 1605 | break; |
| 1606 | } |
| 1607 | } |
| 1608 | |
| 1609 | |
| 1610 | // Returns the number of characters in the equivalence class, omitting those |
| 1611 | // that cannot occur in the source string because it is Latin1. |
| 1612 | static int GetCaseIndependentLetters(Isolate* isolate, uc16 character, |
| 1613 | bool one_byte_subject, |
| 1614 | unibrow::uchar* letters) { |
| 1615 | int length = |
| 1616 | isolate->jsregexp_uncanonicalize()->get(character, '\0', letters); |
| 1617 | // Unibrow returns 0 or 1 for characters where case independence is |
| 1618 | // trivial. |
| 1619 | if (length == 0) { |
| 1620 | letters[0] = character; |
| 1621 | length = 1; |
| 1622 | } |
| 1623 | |
| 1624 | if (one_byte_subject) { |
| 1625 | int new_length = 0; |
| 1626 | for (int i = 0; i < length; i++) { |
| 1627 | if (letters[i] <= String::kMaxOneByteCharCode) { |
| 1628 | letters[new_length++] = letters[i]; |
| 1629 | } |
| 1630 | } |
| 1631 | length = new_length; |
| 1632 | } |
| 1633 | |
| 1634 | return length; |
| 1635 | } |
| 1636 | |
| 1637 | |
| 1638 | static inline bool EmitSimpleCharacter(Isolate* isolate, |
| 1639 | RegExpCompiler* compiler, |
| 1640 | uc16 c, |
| 1641 | Label* on_failure, |
| 1642 | int cp_offset, |
| 1643 | bool check, |
| 1644 | bool preloaded) { |
| 1645 | RegExpMacroAssembler* assembler = compiler->macro_assembler(); |
| 1646 | bool bound_checked = false; |
| 1647 | if (!preloaded) { |
| 1648 | assembler->LoadCurrentCharacter( |
| 1649 | cp_offset, |
| 1650 | on_failure, |
| 1651 | check); |
| 1652 | bound_checked = true; |
| 1653 | } |
| 1654 | assembler->CheckNotCharacter(c, on_failure); |
| 1655 | return bound_checked; |
| 1656 | } |
| 1657 | |
| 1658 | |
| 1659 | // Only emits non-letters (things that don't have case). Only used for case |
| 1660 | // independent matches. |
| 1661 | static inline bool EmitAtomNonLetter(Isolate* isolate, |
| 1662 | RegExpCompiler* compiler, |
| 1663 | uc16 c, |
| 1664 | Label* on_failure, |
| 1665 | int cp_offset, |
| 1666 | bool check, |
| 1667 | bool preloaded) { |
| 1668 | RegExpMacroAssembler* macro_assembler = compiler->macro_assembler(); |
| 1669 | bool one_byte = compiler->one_byte(); |
| 1670 | unibrow::uchar chars[unibrow::Ecma262UnCanonicalize::kMaxWidth]; |
| 1671 | int length = GetCaseIndependentLetters(isolate, c, one_byte, chars); |
| 1672 | if (length < 1) { |
| 1673 | // This can't match. Must be an one-byte subject and a non-one-byte |
| 1674 | // character. We do not need to do anything since the one-byte pass |
| 1675 | // already handled this. |
| 1676 | return false; // Bounds not checked. |
| 1677 | } |
| 1678 | bool checked = false; |
| 1679 | // We handle the length > 1 case in a later pass. |
| 1680 | if (length == 1) { |
| 1681 | if (one_byte && c > String::kMaxOneByteCharCodeU) { |
| 1682 | // Can't match - see above. |
| 1683 | return false; // Bounds not checked. |
| 1684 | } |
| 1685 | if (!preloaded) { |
| 1686 | macro_assembler->LoadCurrentCharacter(cp_offset, on_failure, check); |
| 1687 | checked = check; |
| 1688 | } |
| 1689 | macro_assembler->CheckNotCharacter(c, on_failure); |
| 1690 | } |
| 1691 | return checked; |
| 1692 | } |
| 1693 | |
| 1694 | |
| 1695 | static bool ShortCutEmitCharacterPair(RegExpMacroAssembler* macro_assembler, |
| 1696 | bool one_byte, uc16 c1, uc16 c2, |
| 1697 | Label* on_failure) { |
| 1698 | uc16 char_mask; |
| 1699 | if (one_byte) { |
| 1700 | char_mask = String::kMaxOneByteCharCode; |
| 1701 | } else { |
| 1702 | char_mask = String::kMaxUtf16CodeUnit; |
| 1703 | } |
| 1704 | uc16 exor = c1 ^ c2; |
| 1705 | // Check whether exor has only one bit set. |
| 1706 | if (((exor - 1) & exor) == 0) { |
| 1707 | // If c1 and c2 differ only by one bit. |
| 1708 | // Ecma262UnCanonicalize always gives the highest number last. |
| 1709 | DCHECK(c2 > c1); |
| 1710 | uc16 mask = char_mask ^ exor; |
| 1711 | macro_assembler->CheckNotCharacterAfterAnd(c1, mask, on_failure); |
| 1712 | return true; |
| 1713 | } |
| 1714 | DCHECK(c2 > c1); |
| 1715 | uc16 diff = c2 - c1; |
| 1716 | if (((diff - 1) & diff) == 0 && c1 >= diff) { |
| 1717 | // If the characters differ by 2^n but don't differ by one bit then |
| 1718 | // subtract the difference from the found character, then do the or |
| 1719 | // trick. We avoid the theoretical case where negative numbers are |
| 1720 | // involved in order to simplify code generation. |
| 1721 | uc16 mask = char_mask ^ diff; |
| 1722 | macro_assembler->CheckNotCharacterAfterMinusAnd(c1 - diff, |
| 1723 | diff, |
| 1724 | mask, |
| 1725 | on_failure); |
| 1726 | return true; |
| 1727 | } |
| 1728 | return false; |
| 1729 | } |
| 1730 | |
| 1731 | |
| 1732 | typedef bool EmitCharacterFunction(Isolate* isolate, |
| 1733 | RegExpCompiler* compiler, |
| 1734 | uc16 c, |
| 1735 | Label* on_failure, |
| 1736 | int cp_offset, |
| 1737 | bool check, |
| 1738 | bool preloaded); |
| 1739 | |
| 1740 | // Only emits letters (things that have case). Only used for case independent |
| 1741 | // matches. |
| 1742 | static inline bool EmitAtomLetter(Isolate* isolate, |
| 1743 | RegExpCompiler* compiler, |
| 1744 | uc16 c, |
| 1745 | Label* on_failure, |
| 1746 | int cp_offset, |
| 1747 | bool check, |
| 1748 | bool preloaded) { |
| 1749 | RegExpMacroAssembler* macro_assembler = compiler->macro_assembler(); |
| 1750 | bool one_byte = compiler->one_byte(); |
| 1751 | unibrow::uchar chars[unibrow::Ecma262UnCanonicalize::kMaxWidth]; |
| 1752 | int length = GetCaseIndependentLetters(isolate, c, one_byte, chars); |
| 1753 | if (length <= 1) return false; |
| 1754 | // We may not need to check against the end of the input string |
| 1755 | // if this character lies before a character that matched. |
| 1756 | if (!preloaded) { |
| 1757 | macro_assembler->LoadCurrentCharacter(cp_offset, on_failure, check); |
| 1758 | } |
| 1759 | Label ok; |
| 1760 | DCHECK(unibrow::Ecma262UnCanonicalize::kMaxWidth == 4); |
| 1761 | switch (length) { |
| 1762 | case 2: { |
| 1763 | if (ShortCutEmitCharacterPair(macro_assembler, one_byte, chars[0], |
| 1764 | chars[1], on_failure)) { |
| 1765 | } else { |
| 1766 | macro_assembler->CheckCharacter(chars[0], &ok); |
| 1767 | macro_assembler->CheckNotCharacter(chars[1], on_failure); |
| 1768 | macro_assembler->Bind(&ok); |
| 1769 | } |
| 1770 | break; |
| 1771 | } |
| 1772 | case 4: |
| 1773 | macro_assembler->CheckCharacter(chars[3], &ok); |
| 1774 | // Fall through! |
| 1775 | case 3: |
| 1776 | macro_assembler->CheckCharacter(chars[0], &ok); |
| 1777 | macro_assembler->CheckCharacter(chars[1], &ok); |
| 1778 | macro_assembler->CheckNotCharacter(chars[2], on_failure); |
| 1779 | macro_assembler->Bind(&ok); |
| 1780 | break; |
| 1781 | default: |
| 1782 | UNREACHABLE(); |
| 1783 | break; |
| 1784 | } |
| 1785 | return true; |
| 1786 | } |
| 1787 | |
| 1788 | |
| 1789 | static void EmitBoundaryTest(RegExpMacroAssembler* masm, |
| 1790 | int border, |
| 1791 | Label* fall_through, |
| 1792 | Label* above_or_equal, |
| 1793 | Label* below) { |
| 1794 | if (below != fall_through) { |
| 1795 | masm->CheckCharacterLT(border, below); |
| 1796 | if (above_or_equal != fall_through) masm->GoTo(above_or_equal); |
| 1797 | } else { |
| 1798 | masm->CheckCharacterGT(border - 1, above_or_equal); |
| 1799 | } |
| 1800 | } |
| 1801 | |
| 1802 | |
| 1803 | static void EmitDoubleBoundaryTest(RegExpMacroAssembler* masm, |
| 1804 | int first, |
| 1805 | int last, |
| 1806 | Label* fall_through, |
| 1807 | Label* in_range, |
| 1808 | Label* out_of_range) { |
| 1809 | if (in_range == fall_through) { |
| 1810 | if (first == last) { |
| 1811 | masm->CheckNotCharacter(first, out_of_range); |
| 1812 | } else { |
| 1813 | masm->CheckCharacterNotInRange(first, last, out_of_range); |
| 1814 | } |
| 1815 | } else { |
| 1816 | if (first == last) { |
| 1817 | masm->CheckCharacter(first, in_range); |
| 1818 | } else { |
| 1819 | masm->CheckCharacterInRange(first, last, in_range); |
| 1820 | } |
| 1821 | if (out_of_range != fall_through) masm->GoTo(out_of_range); |
| 1822 | } |
| 1823 | } |
| 1824 | |
| 1825 | |
| 1826 | // even_label is for ranges[i] to ranges[i + 1] where i - start_index is even. |
| 1827 | // odd_label is for ranges[i] to ranges[i + 1] where i - start_index is odd. |
| 1828 | static void EmitUseLookupTable( |
| 1829 | RegExpMacroAssembler* masm, |
| 1830 | ZoneList<int>* ranges, |
| 1831 | int start_index, |
| 1832 | int end_index, |
| 1833 | int min_char, |
| 1834 | Label* fall_through, |
| 1835 | Label* even_label, |
| 1836 | Label* odd_label) { |
| 1837 | static const int kSize = RegExpMacroAssembler::kTableSize; |
| 1838 | static const int kMask = RegExpMacroAssembler::kTableMask; |
| 1839 | |
| 1840 | int base = (min_char & ~kMask); |
| 1841 | USE(base); |
| 1842 | |
| 1843 | // Assert that everything is on one kTableSize page. |
| 1844 | for (int i = start_index; i <= end_index; i++) { |
| 1845 | DCHECK_EQ(ranges->at(i) & ~kMask, base); |
| 1846 | } |
| 1847 | DCHECK(start_index == 0 || (ranges->at(start_index - 1) & ~kMask) <= base); |
| 1848 | |
| 1849 | char templ[kSize]; |
| 1850 | Label* on_bit_set; |
| 1851 | Label* on_bit_clear; |
| 1852 | int bit; |
| 1853 | if (even_label == fall_through) { |
| 1854 | on_bit_set = odd_label; |
| 1855 | on_bit_clear = even_label; |
| 1856 | bit = 1; |
| 1857 | } else { |
| 1858 | on_bit_set = even_label; |
| 1859 | on_bit_clear = odd_label; |
| 1860 | bit = 0; |
| 1861 | } |
| 1862 | for (int i = 0; i < (ranges->at(start_index) & kMask) && i < kSize; i++) { |
| 1863 | templ[i] = bit; |
| 1864 | } |
| 1865 | int j = 0; |
| 1866 | bit ^= 1; |
| 1867 | for (int i = start_index; i < end_index; i++) { |
| 1868 | for (j = (ranges->at(i) & kMask); j < (ranges->at(i + 1) & kMask); j++) { |
| 1869 | templ[j] = bit; |
| 1870 | } |
| 1871 | bit ^= 1; |
| 1872 | } |
| 1873 | for (int i = j; i < kSize; i++) { |
| 1874 | templ[i] = bit; |
| 1875 | } |
| 1876 | Factory* factory = masm->isolate()->factory(); |
| 1877 | // TODO(erikcorry): Cache these. |
| 1878 | Handle<ByteArray> ba = factory->NewByteArray(kSize, TENURED); |
| 1879 | for (int i = 0; i < kSize; i++) { |
| 1880 | ba->set(i, templ[i]); |
| 1881 | } |
| 1882 | masm->CheckBitInTable(ba, on_bit_set); |
| 1883 | if (on_bit_clear != fall_through) masm->GoTo(on_bit_clear); |
| 1884 | } |
| 1885 | |
| 1886 | |
| 1887 | static void CutOutRange(RegExpMacroAssembler* masm, |
| 1888 | ZoneList<int>* ranges, |
| 1889 | int start_index, |
| 1890 | int end_index, |
| 1891 | int cut_index, |
| 1892 | Label* even_label, |
| 1893 | Label* odd_label) { |
| 1894 | bool odd = (((cut_index - start_index) & 1) == 1); |
| 1895 | Label* in_range_label = odd ? odd_label : even_label; |
| 1896 | Label dummy; |
| 1897 | EmitDoubleBoundaryTest(masm, |
| 1898 | ranges->at(cut_index), |
| 1899 | ranges->at(cut_index + 1) - 1, |
| 1900 | &dummy, |
| 1901 | in_range_label, |
| 1902 | &dummy); |
| 1903 | DCHECK(!dummy.is_linked()); |
| 1904 | // Cut out the single range by rewriting the array. This creates a new |
| 1905 | // range that is a merger of the two ranges on either side of the one we |
| 1906 | // are cutting out. The oddity of the labels is preserved. |
| 1907 | for (int j = cut_index; j > start_index; j--) { |
| 1908 | ranges->at(j) = ranges->at(j - 1); |
| 1909 | } |
| 1910 | for (int j = cut_index + 1; j < end_index; j++) { |
| 1911 | ranges->at(j) = ranges->at(j + 1); |
| 1912 | } |
| 1913 | } |
| 1914 | |
| 1915 | |
| 1916 | // Unicode case. Split the search space into kSize spaces that are handled |
| 1917 | // with recursion. |
| 1918 | static void SplitSearchSpace(ZoneList<int>* ranges, |
| 1919 | int start_index, |
| 1920 | int end_index, |
| 1921 | int* new_start_index, |
| 1922 | int* new_end_index, |
| 1923 | int* border) { |
| 1924 | static const int kSize = RegExpMacroAssembler::kTableSize; |
| 1925 | static const int kMask = RegExpMacroAssembler::kTableMask; |
| 1926 | |
| 1927 | int first = ranges->at(start_index); |
| 1928 | int last = ranges->at(end_index) - 1; |
| 1929 | |
| 1930 | *new_start_index = start_index; |
| 1931 | *border = (ranges->at(start_index) & ~kMask) + kSize; |
| 1932 | while (*new_start_index < end_index) { |
| 1933 | if (ranges->at(*new_start_index) > *border) break; |
| 1934 | (*new_start_index)++; |
| 1935 | } |
| 1936 | // new_start_index is the index of the first edge that is beyond the |
| 1937 | // current kSize space. |
| 1938 | |
| 1939 | // For very large search spaces we do a binary chop search of the non-Latin1 |
| 1940 | // space instead of just going to the end of the current kSize space. The |
| 1941 | // heuristics are complicated a little by the fact that any 128-character |
| 1942 | // encoding space can be quickly tested with a table lookup, so we don't |
| 1943 | // wish to do binary chop search at a smaller granularity than that. A |
| 1944 | // 128-character space can take up a lot of space in the ranges array if, |
| 1945 | // for example, we only want to match every second character (eg. the lower |
| 1946 | // case characters on some Unicode pages). |
| 1947 | int binary_chop_index = (end_index + start_index) / 2; |
| 1948 | // The first test ensures that we get to the code that handles the Latin1 |
| 1949 | // range with a single not-taken branch, speeding up this important |
| 1950 | // character range (even non-Latin1 charset-based text has spaces and |
| 1951 | // punctuation). |
| 1952 | if (*border - 1 > String::kMaxOneByteCharCode && // Latin1 case. |
| 1953 | end_index - start_index > (*new_start_index - start_index) * 2 && |
| 1954 | last - first > kSize * 2 && binary_chop_index > *new_start_index && |
| 1955 | ranges->at(binary_chop_index) >= first + 2 * kSize) { |
| 1956 | int scan_forward_for_section_border = binary_chop_index;; |
| 1957 | int new_border = (ranges->at(binary_chop_index) | kMask) + 1; |
| 1958 | |
| 1959 | while (scan_forward_for_section_border < end_index) { |
| 1960 | if (ranges->at(scan_forward_for_section_border) > new_border) { |
| 1961 | *new_start_index = scan_forward_for_section_border; |
| 1962 | *border = new_border; |
| 1963 | break; |
| 1964 | } |
| 1965 | scan_forward_for_section_border++; |
| 1966 | } |
| 1967 | } |
| 1968 | |
| 1969 | DCHECK(*new_start_index > start_index); |
| 1970 | *new_end_index = *new_start_index - 1; |
| 1971 | if (ranges->at(*new_end_index) == *border) { |
| 1972 | (*new_end_index)--; |
| 1973 | } |
| 1974 | if (*border >= ranges->at(end_index)) { |
| 1975 | *border = ranges->at(end_index); |
| 1976 | *new_start_index = end_index; // Won't be used. |
| 1977 | *new_end_index = end_index - 1; |
| 1978 | } |
| 1979 | } |
| 1980 | |
| 1981 | |
| 1982 | // Gets a series of segment boundaries representing a character class. If the |
| 1983 | // character is in the range between an even and an odd boundary (counting from |
| 1984 | // start_index) then go to even_label, otherwise go to odd_label. We already |
| 1985 | // know that the character is in the range of min_char to max_char inclusive. |
| 1986 | // Either label can be NULL indicating backtracking. Either label can also be |
| 1987 | // equal to the fall_through label. |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1988 | static void GenerateBranches(RegExpMacroAssembler* masm, ZoneList<int>* ranges, |
| 1989 | int start_index, int end_index, uc32 min_char, |
| 1990 | uc32 max_char, Label* fall_through, |
| 1991 | Label* even_label, Label* odd_label) { |
| 1992 | DCHECK_LE(min_char, String::kMaxUtf16CodeUnit); |
| 1993 | DCHECK_LE(max_char, String::kMaxUtf16CodeUnit); |
| 1994 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1995 | int first = ranges->at(start_index); |
| 1996 | int last = ranges->at(end_index) - 1; |
| 1997 | |
| 1998 | DCHECK_LT(min_char, first); |
| 1999 | |
| 2000 | // Just need to test if the character is before or on-or-after |
| 2001 | // a particular character. |
| 2002 | if (start_index == end_index) { |
| 2003 | EmitBoundaryTest(masm, first, fall_through, even_label, odd_label); |
| 2004 | return; |
| 2005 | } |
| 2006 | |
| 2007 | // Another almost trivial case: There is one interval in the middle that is |
| 2008 | // different from the end intervals. |
| 2009 | if (start_index + 1 == end_index) { |
| 2010 | EmitDoubleBoundaryTest( |
| 2011 | masm, first, last, fall_through, even_label, odd_label); |
| 2012 | return; |
| 2013 | } |
| 2014 | |
| 2015 | // It's not worth using table lookup if there are very few intervals in the |
| 2016 | // character class. |
| 2017 | if (end_index - start_index <= 6) { |
| 2018 | // It is faster to test for individual characters, so we look for those |
| 2019 | // first, then try arbitrary ranges in the second round. |
| 2020 | static int kNoCutIndex = -1; |
| 2021 | int cut = kNoCutIndex; |
| 2022 | for (int i = start_index; i < end_index; i++) { |
| 2023 | if (ranges->at(i) == ranges->at(i + 1) - 1) { |
| 2024 | cut = i; |
| 2025 | break; |
| 2026 | } |
| 2027 | } |
| 2028 | if (cut == kNoCutIndex) cut = start_index; |
| 2029 | CutOutRange( |
| 2030 | masm, ranges, start_index, end_index, cut, even_label, odd_label); |
| 2031 | DCHECK_GE(end_index - start_index, 2); |
| 2032 | GenerateBranches(masm, |
| 2033 | ranges, |
| 2034 | start_index + 1, |
| 2035 | end_index - 1, |
| 2036 | min_char, |
| 2037 | max_char, |
| 2038 | fall_through, |
| 2039 | even_label, |
| 2040 | odd_label); |
| 2041 | return; |
| 2042 | } |
| 2043 | |
| 2044 | // If there are a lot of intervals in the regexp, then we will use tables to |
| 2045 | // determine whether the character is inside or outside the character class. |
| 2046 | static const int kBits = RegExpMacroAssembler::kTableSizeBits; |
| 2047 | |
| 2048 | if ((max_char >> kBits) == (min_char >> kBits)) { |
| 2049 | EmitUseLookupTable(masm, |
| 2050 | ranges, |
| 2051 | start_index, |
| 2052 | end_index, |
| 2053 | min_char, |
| 2054 | fall_through, |
| 2055 | even_label, |
| 2056 | odd_label); |
| 2057 | return; |
| 2058 | } |
| 2059 | |
| 2060 | if ((min_char >> kBits) != (first >> kBits)) { |
| 2061 | masm->CheckCharacterLT(first, odd_label); |
| 2062 | GenerateBranches(masm, |
| 2063 | ranges, |
| 2064 | start_index + 1, |
| 2065 | end_index, |
| 2066 | first, |
| 2067 | max_char, |
| 2068 | fall_through, |
| 2069 | odd_label, |
| 2070 | even_label); |
| 2071 | return; |
| 2072 | } |
| 2073 | |
| 2074 | int new_start_index = 0; |
| 2075 | int new_end_index = 0; |
| 2076 | int border = 0; |
| 2077 | |
| 2078 | SplitSearchSpace(ranges, |
| 2079 | start_index, |
| 2080 | end_index, |
| 2081 | &new_start_index, |
| 2082 | &new_end_index, |
| 2083 | &border); |
| 2084 | |
| 2085 | Label handle_rest; |
| 2086 | Label* above = &handle_rest; |
| 2087 | if (border == last + 1) { |
| 2088 | // We didn't find any section that started after the limit, so everything |
| 2089 | // above the border is one of the terminal labels. |
| 2090 | above = (end_index & 1) != (start_index & 1) ? odd_label : even_label; |
| 2091 | DCHECK(new_end_index == end_index - 1); |
| 2092 | } |
| 2093 | |
| 2094 | DCHECK_LE(start_index, new_end_index); |
| 2095 | DCHECK_LE(new_start_index, end_index); |
| 2096 | DCHECK_LT(start_index, new_start_index); |
| 2097 | DCHECK_LT(new_end_index, end_index); |
| 2098 | DCHECK(new_end_index + 1 == new_start_index || |
| 2099 | (new_end_index + 2 == new_start_index && |
| 2100 | border == ranges->at(new_end_index + 1))); |
| 2101 | DCHECK_LT(min_char, border - 1); |
| 2102 | DCHECK_LT(border, max_char); |
| 2103 | DCHECK_LT(ranges->at(new_end_index), border); |
| 2104 | DCHECK(border < ranges->at(new_start_index) || |
| 2105 | (border == ranges->at(new_start_index) && |
| 2106 | new_start_index == end_index && |
| 2107 | new_end_index == end_index - 1 && |
| 2108 | border == last + 1)); |
| 2109 | DCHECK(new_start_index == 0 || border >= ranges->at(new_start_index - 1)); |
| 2110 | |
| 2111 | masm->CheckCharacterGT(border - 1, above); |
| 2112 | Label dummy; |
| 2113 | GenerateBranches(masm, |
| 2114 | ranges, |
| 2115 | start_index, |
| 2116 | new_end_index, |
| 2117 | min_char, |
| 2118 | border - 1, |
| 2119 | &dummy, |
| 2120 | even_label, |
| 2121 | odd_label); |
| 2122 | if (handle_rest.is_linked()) { |
| 2123 | masm->Bind(&handle_rest); |
| 2124 | bool flip = (new_start_index & 1) != (start_index & 1); |
| 2125 | GenerateBranches(masm, |
| 2126 | ranges, |
| 2127 | new_start_index, |
| 2128 | end_index, |
| 2129 | border, |
| 2130 | max_char, |
| 2131 | &dummy, |
| 2132 | flip ? odd_label : even_label, |
| 2133 | flip ? even_label : odd_label); |
| 2134 | } |
| 2135 | } |
| 2136 | |
| 2137 | |
| 2138 | static void EmitCharClass(RegExpMacroAssembler* macro_assembler, |
| 2139 | RegExpCharacterClass* cc, bool one_byte, |
| 2140 | Label* on_failure, int cp_offset, bool check_offset, |
| 2141 | bool preloaded, Zone* zone) { |
| 2142 | ZoneList<CharacterRange>* ranges = cc->ranges(zone); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 2143 | CharacterRange::Canonicalize(ranges); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 2144 | |
| 2145 | int max_char; |
| 2146 | if (one_byte) { |
| 2147 | max_char = String::kMaxOneByteCharCode; |
| 2148 | } else { |
| 2149 | max_char = String::kMaxUtf16CodeUnit; |
| 2150 | } |
| 2151 | |
| 2152 | int range_count = ranges->length(); |
| 2153 | |
| 2154 | int last_valid_range = range_count - 1; |
| 2155 | while (last_valid_range >= 0) { |
| 2156 | CharacterRange& range = ranges->at(last_valid_range); |
| 2157 | if (range.from() <= max_char) { |
| 2158 | break; |
| 2159 | } |
| 2160 | last_valid_range--; |
| 2161 | } |
| 2162 | |
| 2163 | if (last_valid_range < 0) { |
| 2164 | if (!cc->is_negated()) { |
| 2165 | macro_assembler->GoTo(on_failure); |
| 2166 | } |
| 2167 | if (check_offset) { |
| 2168 | macro_assembler->CheckPosition(cp_offset, on_failure); |
| 2169 | } |
| 2170 | return; |
| 2171 | } |
| 2172 | |
| 2173 | if (last_valid_range == 0 && |
| 2174 | ranges->at(0).IsEverything(max_char)) { |
| 2175 | if (cc->is_negated()) { |
| 2176 | macro_assembler->GoTo(on_failure); |
| 2177 | } else { |
| 2178 | // This is a common case hit by non-anchored expressions. |
| 2179 | if (check_offset) { |
| 2180 | macro_assembler->CheckPosition(cp_offset, on_failure); |
| 2181 | } |
| 2182 | } |
| 2183 | return; |
| 2184 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 2185 | |
| 2186 | if (!preloaded) { |
| 2187 | macro_assembler->LoadCurrentCharacter(cp_offset, on_failure, check_offset); |
| 2188 | } |
| 2189 | |
| 2190 | if (cc->is_standard(zone) && |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 2191 | macro_assembler->CheckSpecialCharacterClass(cc->standard_type(), |
| 2192 | on_failure)) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 2193 | return; |
| 2194 | } |
| 2195 | |
| 2196 | |
| 2197 | // A new list with ascending entries. Each entry is a code unit |
| 2198 | // where there is a boundary between code units that are part of |
| 2199 | // the class and code units that are not. Normally we insert an |
| 2200 | // entry at zero which goes to the failure label, but if there |
| 2201 | // was already one there we fall through for success on that entry. |
| 2202 | // Subsequent entries have alternating meaning (success/failure). |
| 2203 | ZoneList<int>* range_boundaries = |
| 2204 | new(zone) ZoneList<int>(last_valid_range, zone); |
| 2205 | |
| 2206 | bool zeroth_entry_is_failure = !cc->is_negated(); |
| 2207 | |
| 2208 | for (int i = 0; i <= last_valid_range; i++) { |
| 2209 | CharacterRange& range = ranges->at(i); |
| 2210 | if (range.from() == 0) { |
| 2211 | DCHECK_EQ(i, 0); |
| 2212 | zeroth_entry_is_failure = !zeroth_entry_is_failure; |
| 2213 | } else { |
| 2214 | range_boundaries->Add(range.from(), zone); |
| 2215 | } |
| 2216 | range_boundaries->Add(range.to() + 1, zone); |
| 2217 | } |
| 2218 | int end_index = range_boundaries->length() - 1; |
| 2219 | if (range_boundaries->at(end_index) > max_char) { |
| 2220 | end_index--; |
| 2221 | } |
| 2222 | |
| 2223 | Label fall_through; |
| 2224 | GenerateBranches(macro_assembler, |
| 2225 | range_boundaries, |
| 2226 | 0, // start_index. |
| 2227 | end_index, |
| 2228 | 0, // min_char. |
| 2229 | max_char, |
| 2230 | &fall_through, |
| 2231 | zeroth_entry_is_failure ? &fall_through : on_failure, |
| 2232 | zeroth_entry_is_failure ? on_failure : &fall_through); |
| 2233 | macro_assembler->Bind(&fall_through); |
| 2234 | } |
| 2235 | |
| 2236 | |
| 2237 | RegExpNode::~RegExpNode() { |
| 2238 | } |
| 2239 | |
| 2240 | |
| 2241 | RegExpNode::LimitResult RegExpNode::LimitVersions(RegExpCompiler* compiler, |
| 2242 | Trace* trace) { |
| 2243 | // If we are generating a greedy loop then don't stop and don't reuse code. |
| 2244 | if (trace->stop_node() != NULL) { |
| 2245 | return CONTINUE; |
| 2246 | } |
| 2247 | |
| 2248 | RegExpMacroAssembler* macro_assembler = compiler->macro_assembler(); |
| 2249 | if (trace->is_trivial()) { |
| 2250 | if (label_.is_bound() || on_work_list() || !KeepRecursing(compiler)) { |
| 2251 | // If a generic version is already scheduled to be generated or we have |
| 2252 | // recursed too deeply then just generate a jump to that code. |
| 2253 | macro_assembler->GoTo(&label_); |
| 2254 | // This will queue it up for generation of a generic version if it hasn't |
| 2255 | // already been queued. |
| 2256 | compiler->AddWork(this); |
| 2257 | return DONE; |
| 2258 | } |
| 2259 | // Generate generic version of the node and bind the label for later use. |
| 2260 | macro_assembler->Bind(&label_); |
| 2261 | return CONTINUE; |
| 2262 | } |
| 2263 | |
| 2264 | // We are being asked to make a non-generic version. Keep track of how many |
| 2265 | // non-generic versions we generate so as not to overdo it. |
| 2266 | trace_count_++; |
| 2267 | if (KeepRecursing(compiler) && compiler->optimize() && |
| 2268 | trace_count_ < kMaxCopiesCodeGenerated) { |
| 2269 | return CONTINUE; |
| 2270 | } |
| 2271 | |
| 2272 | // If we get here code has been generated for this node too many times or |
| 2273 | // recursion is too deep. Time to switch to a generic version. The code for |
| 2274 | // generic versions above can handle deep recursion properly. |
| 2275 | bool was_limiting = compiler->limiting_recursion(); |
| 2276 | compiler->set_limiting_recursion(true); |
| 2277 | trace->Flush(compiler, this); |
| 2278 | compiler->set_limiting_recursion(was_limiting); |
| 2279 | return DONE; |
| 2280 | } |
| 2281 | |
| 2282 | |
| 2283 | bool RegExpNode::KeepRecursing(RegExpCompiler* compiler) { |
| 2284 | return !compiler->limiting_recursion() && |
| 2285 | compiler->recursion_depth() <= RegExpCompiler::kMaxRecursion; |
| 2286 | } |
| 2287 | |
| 2288 | |
| 2289 | int ActionNode::EatsAtLeast(int still_to_find, |
| 2290 | int budget, |
| 2291 | bool not_at_start) { |
| 2292 | if (budget <= 0) return 0; |
| 2293 | if (action_type_ == POSITIVE_SUBMATCH_SUCCESS) return 0; // Rewinds input! |
| 2294 | return on_success()->EatsAtLeast(still_to_find, |
| 2295 | budget - 1, |
| 2296 | not_at_start); |
| 2297 | } |
| 2298 | |
| 2299 | |
| 2300 | void ActionNode::FillInBMInfo(Isolate* isolate, int offset, int budget, |
| 2301 | BoyerMooreLookahead* bm, bool not_at_start) { |
| 2302 | if (action_type_ == BEGIN_SUBMATCH) { |
| 2303 | bm->SetRest(offset); |
| 2304 | } else if (action_type_ != POSITIVE_SUBMATCH_SUCCESS) { |
| 2305 | on_success()->FillInBMInfo(isolate, offset, budget - 1, bm, not_at_start); |
| 2306 | } |
| 2307 | SaveBMInfo(bm, not_at_start, offset); |
| 2308 | } |
| 2309 | |
| 2310 | |
| 2311 | int AssertionNode::EatsAtLeast(int still_to_find, |
| 2312 | int budget, |
| 2313 | bool not_at_start) { |
| 2314 | if (budget <= 0) return 0; |
| 2315 | // If we know we are not at the start and we are asked "how many characters |
| 2316 | // will you match if you succeed?" then we can answer anything since false |
| 2317 | // implies false. So lets just return the max answer (still_to_find) since |
| 2318 | // that won't prevent us from preloading a lot of characters for the other |
| 2319 | // branches in the node graph. |
| 2320 | if (assertion_type() == AT_START && not_at_start) return still_to_find; |
| 2321 | return on_success()->EatsAtLeast(still_to_find, |
| 2322 | budget - 1, |
| 2323 | not_at_start); |
| 2324 | } |
| 2325 | |
| 2326 | |
| 2327 | void AssertionNode::FillInBMInfo(Isolate* isolate, int offset, int budget, |
| 2328 | BoyerMooreLookahead* bm, bool not_at_start) { |
| 2329 | // Match the behaviour of EatsAtLeast on this node. |
| 2330 | if (assertion_type() == AT_START && not_at_start) return; |
| 2331 | on_success()->FillInBMInfo(isolate, offset, budget - 1, bm, not_at_start); |
| 2332 | SaveBMInfo(bm, not_at_start, offset); |
| 2333 | } |
| 2334 | |
| 2335 | |
| 2336 | int BackReferenceNode::EatsAtLeast(int still_to_find, |
| 2337 | int budget, |
| 2338 | bool not_at_start) { |
| 2339 | if (read_backward()) return 0; |
| 2340 | if (budget <= 0) return 0; |
| 2341 | return on_success()->EatsAtLeast(still_to_find, |
| 2342 | budget - 1, |
| 2343 | not_at_start); |
| 2344 | } |
| 2345 | |
| 2346 | |
| 2347 | int TextNode::EatsAtLeast(int still_to_find, |
| 2348 | int budget, |
| 2349 | bool not_at_start) { |
| 2350 | if (read_backward()) return 0; |
| 2351 | int answer = Length(); |
| 2352 | if (answer >= still_to_find) return answer; |
| 2353 | if (budget <= 0) return answer; |
| 2354 | // We are not at start after this node so we set the last argument to 'true'. |
| 2355 | return answer + on_success()->EatsAtLeast(still_to_find - answer, |
| 2356 | budget - 1, |
| 2357 | true); |
| 2358 | } |
| 2359 | |
| 2360 | |
| 2361 | int NegativeLookaroundChoiceNode::EatsAtLeast(int still_to_find, int budget, |
| 2362 | bool not_at_start) { |
| 2363 | if (budget <= 0) return 0; |
| 2364 | // Alternative 0 is the negative lookahead, alternative 1 is what comes |
| 2365 | // afterwards. |
| 2366 | RegExpNode* node = alternatives_->at(1).node(); |
| 2367 | return node->EatsAtLeast(still_to_find, budget - 1, not_at_start); |
| 2368 | } |
| 2369 | |
| 2370 | |
| 2371 | void NegativeLookaroundChoiceNode::GetQuickCheckDetails( |
| 2372 | QuickCheckDetails* details, RegExpCompiler* compiler, int filled_in, |
| 2373 | bool not_at_start) { |
| 2374 | // Alternative 0 is the negative lookahead, alternative 1 is what comes |
| 2375 | // afterwards. |
| 2376 | RegExpNode* node = alternatives_->at(1).node(); |
| 2377 | return node->GetQuickCheckDetails(details, compiler, filled_in, not_at_start); |
| 2378 | } |
| 2379 | |
| 2380 | |
| 2381 | int ChoiceNode::EatsAtLeastHelper(int still_to_find, |
| 2382 | int budget, |
| 2383 | RegExpNode* ignore_this_node, |
| 2384 | bool not_at_start) { |
| 2385 | if (budget <= 0) return 0; |
| 2386 | int min = 100; |
| 2387 | int choice_count = alternatives_->length(); |
| 2388 | budget = (budget - 1) / choice_count; |
| 2389 | for (int i = 0; i < choice_count; i++) { |
| 2390 | RegExpNode* node = alternatives_->at(i).node(); |
| 2391 | if (node == ignore_this_node) continue; |
| 2392 | int node_eats_at_least = |
| 2393 | node->EatsAtLeast(still_to_find, budget, not_at_start); |
| 2394 | if (node_eats_at_least < min) min = node_eats_at_least; |
| 2395 | if (min == 0) return 0; |
| 2396 | } |
| 2397 | return min; |
| 2398 | } |
| 2399 | |
| 2400 | |
| 2401 | int LoopChoiceNode::EatsAtLeast(int still_to_find, |
| 2402 | int budget, |
| 2403 | bool not_at_start) { |
| 2404 | return EatsAtLeastHelper(still_to_find, |
| 2405 | budget - 1, |
| 2406 | loop_node_, |
| 2407 | not_at_start); |
| 2408 | } |
| 2409 | |
| 2410 | |
| 2411 | int ChoiceNode::EatsAtLeast(int still_to_find, |
| 2412 | int budget, |
| 2413 | bool not_at_start) { |
| 2414 | return EatsAtLeastHelper(still_to_find, |
| 2415 | budget, |
| 2416 | NULL, |
| 2417 | not_at_start); |
| 2418 | } |
| 2419 | |
| 2420 | |
| 2421 | // Takes the left-most 1-bit and smears it out, setting all bits to its right. |
| 2422 | static inline uint32_t SmearBitsRight(uint32_t v) { |
| 2423 | v |= v >> 1; |
| 2424 | v |= v >> 2; |
| 2425 | v |= v >> 4; |
| 2426 | v |= v >> 8; |
| 2427 | v |= v >> 16; |
| 2428 | return v; |
| 2429 | } |
| 2430 | |
| 2431 | |
| 2432 | bool QuickCheckDetails::Rationalize(bool asc) { |
| 2433 | bool found_useful_op = false; |
| 2434 | uint32_t char_mask; |
| 2435 | if (asc) { |
| 2436 | char_mask = String::kMaxOneByteCharCode; |
| 2437 | } else { |
| 2438 | char_mask = String::kMaxUtf16CodeUnit; |
| 2439 | } |
| 2440 | mask_ = 0; |
| 2441 | value_ = 0; |
| 2442 | int char_shift = 0; |
| 2443 | for (int i = 0; i < characters_; i++) { |
| 2444 | Position* pos = &positions_[i]; |
| 2445 | if ((pos->mask & String::kMaxOneByteCharCode) != 0) { |
| 2446 | found_useful_op = true; |
| 2447 | } |
| 2448 | mask_ |= (pos->mask & char_mask) << char_shift; |
| 2449 | value_ |= (pos->value & char_mask) << char_shift; |
| 2450 | char_shift += asc ? 8 : 16; |
| 2451 | } |
| 2452 | return found_useful_op; |
| 2453 | } |
| 2454 | |
| 2455 | |
| 2456 | bool RegExpNode::EmitQuickCheck(RegExpCompiler* compiler, |
| 2457 | Trace* bounds_check_trace, |
| 2458 | Trace* trace, |
| 2459 | bool preload_has_checked_bounds, |
| 2460 | Label* on_possible_success, |
| 2461 | QuickCheckDetails* details, |
| 2462 | bool fall_through_on_failure) { |
| 2463 | if (details->characters() == 0) return false; |
| 2464 | GetQuickCheckDetails( |
| 2465 | details, compiler, 0, trace->at_start() == Trace::FALSE_VALUE); |
| 2466 | if (details->cannot_match()) return false; |
| 2467 | if (!details->Rationalize(compiler->one_byte())) return false; |
| 2468 | DCHECK(details->characters() == 1 || |
| 2469 | compiler->macro_assembler()->CanReadUnaligned()); |
| 2470 | uint32_t mask = details->mask(); |
| 2471 | uint32_t value = details->value(); |
| 2472 | |
| 2473 | RegExpMacroAssembler* assembler = compiler->macro_assembler(); |
| 2474 | |
| 2475 | if (trace->characters_preloaded() != details->characters()) { |
| 2476 | DCHECK(trace->cp_offset() == bounds_check_trace->cp_offset()); |
| 2477 | // We are attempting to preload the minimum number of characters |
| 2478 | // any choice would eat, so if the bounds check fails, then none of the |
| 2479 | // choices can succeed, so we can just immediately backtrack, rather |
| 2480 | // than go to the next choice. |
| 2481 | assembler->LoadCurrentCharacter(trace->cp_offset(), |
| 2482 | bounds_check_trace->backtrack(), |
| 2483 | !preload_has_checked_bounds, |
| 2484 | details->characters()); |
| 2485 | } |
| 2486 | |
| 2487 | |
| 2488 | bool need_mask = true; |
| 2489 | |
| 2490 | if (details->characters() == 1) { |
| 2491 | // If number of characters preloaded is 1 then we used a byte or 16 bit |
| 2492 | // load so the value is already masked down. |
| 2493 | uint32_t char_mask; |
| 2494 | if (compiler->one_byte()) { |
| 2495 | char_mask = String::kMaxOneByteCharCode; |
| 2496 | } else { |
| 2497 | char_mask = String::kMaxUtf16CodeUnit; |
| 2498 | } |
| 2499 | if ((mask & char_mask) == char_mask) need_mask = false; |
| 2500 | mask &= char_mask; |
| 2501 | } else { |
| 2502 | // For 2-character preloads in one-byte mode or 1-character preloads in |
| 2503 | // two-byte mode we also use a 16 bit load with zero extend. |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 2504 | static const uint32_t kTwoByteMask = 0xffff; |
| 2505 | static const uint32_t kFourByteMask = 0xffffffff; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 2506 | if (details->characters() == 2 && compiler->one_byte()) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 2507 | if ((mask & kTwoByteMask) == kTwoByteMask) need_mask = false; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 2508 | } else if (details->characters() == 1 && !compiler->one_byte()) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 2509 | if ((mask & kTwoByteMask) == kTwoByteMask) need_mask = false; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 2510 | } else { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 2511 | if (mask == kFourByteMask) need_mask = false; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 2512 | } |
| 2513 | } |
| 2514 | |
| 2515 | if (fall_through_on_failure) { |
| 2516 | if (need_mask) { |
| 2517 | assembler->CheckCharacterAfterAnd(value, mask, on_possible_success); |
| 2518 | } else { |
| 2519 | assembler->CheckCharacter(value, on_possible_success); |
| 2520 | } |
| 2521 | } else { |
| 2522 | if (need_mask) { |
| 2523 | assembler->CheckNotCharacterAfterAnd(value, mask, trace->backtrack()); |
| 2524 | } else { |
| 2525 | assembler->CheckNotCharacter(value, trace->backtrack()); |
| 2526 | } |
| 2527 | } |
| 2528 | return true; |
| 2529 | } |
| 2530 | |
| 2531 | |
| 2532 | // Here is the meat of GetQuickCheckDetails (see also the comment on the |
| 2533 | // super-class in the .h file). |
| 2534 | // |
| 2535 | // We iterate along the text object, building up for each character a |
| 2536 | // mask and value that can be used to test for a quick failure to match. |
| 2537 | // The masks and values for the positions will be combined into a single |
| 2538 | // machine word for the current character width in order to be used in |
| 2539 | // generating a quick check. |
| 2540 | void TextNode::GetQuickCheckDetails(QuickCheckDetails* details, |
| 2541 | RegExpCompiler* compiler, |
| 2542 | int characters_filled_in, |
| 2543 | bool not_at_start) { |
| 2544 | // Do not collect any quick check details if the text node reads backward, |
| 2545 | // since it reads in the opposite direction than we use for quick checks. |
| 2546 | if (read_backward()) return; |
| 2547 | Isolate* isolate = compiler->macro_assembler()->isolate(); |
| 2548 | DCHECK(characters_filled_in < details->characters()); |
| 2549 | int characters = details->characters(); |
| 2550 | int char_mask; |
| 2551 | if (compiler->one_byte()) { |
| 2552 | char_mask = String::kMaxOneByteCharCode; |
| 2553 | } else { |
| 2554 | char_mask = String::kMaxUtf16CodeUnit; |
| 2555 | } |
| 2556 | for (int k = 0; k < elements()->length(); k++) { |
| 2557 | TextElement elm = elements()->at(k); |
| 2558 | if (elm.text_type() == TextElement::ATOM) { |
| 2559 | Vector<const uc16> quarks = elm.atom()->data(); |
| 2560 | for (int i = 0; i < characters && i < quarks.length(); i++) { |
| 2561 | QuickCheckDetails::Position* pos = |
| 2562 | details->positions(characters_filled_in); |
| 2563 | uc16 c = quarks[i]; |
| 2564 | if (compiler->ignore_case()) { |
| 2565 | unibrow::uchar chars[unibrow::Ecma262UnCanonicalize::kMaxWidth]; |
| 2566 | int length = GetCaseIndependentLetters(isolate, c, |
| 2567 | compiler->one_byte(), chars); |
| 2568 | if (length == 0) { |
| 2569 | // This can happen because all case variants are non-Latin1, but we |
| 2570 | // know the input is Latin1. |
| 2571 | details->set_cannot_match(); |
| 2572 | pos->determines_perfectly = false; |
| 2573 | return; |
| 2574 | } |
| 2575 | if (length == 1) { |
| 2576 | // This letter has no case equivalents, so it's nice and simple |
| 2577 | // and the mask-compare will determine definitely whether we have |
| 2578 | // a match at this character position. |
| 2579 | pos->mask = char_mask; |
| 2580 | pos->value = c; |
| 2581 | pos->determines_perfectly = true; |
| 2582 | } else { |
| 2583 | uint32_t common_bits = char_mask; |
| 2584 | uint32_t bits = chars[0]; |
| 2585 | for (int j = 1; j < length; j++) { |
| 2586 | uint32_t differing_bits = ((chars[j] & common_bits) ^ bits); |
| 2587 | common_bits ^= differing_bits; |
| 2588 | bits &= common_bits; |
| 2589 | } |
| 2590 | // If length is 2 and common bits has only one zero in it then |
| 2591 | // our mask and compare instruction will determine definitely |
| 2592 | // whether we have a match at this character position. Otherwise |
| 2593 | // it can only be an approximate check. |
| 2594 | uint32_t one_zero = (common_bits | ~char_mask); |
| 2595 | if (length == 2 && ((~one_zero) & ((~one_zero) - 1)) == 0) { |
| 2596 | pos->determines_perfectly = true; |
| 2597 | } |
| 2598 | pos->mask = common_bits; |
| 2599 | pos->value = bits; |
| 2600 | } |
| 2601 | } else { |
| 2602 | // Don't ignore case. Nice simple case where the mask-compare will |
| 2603 | // determine definitely whether we have a match at this character |
| 2604 | // position. |
| 2605 | if (c > char_mask) { |
| 2606 | details->set_cannot_match(); |
| 2607 | pos->determines_perfectly = false; |
| 2608 | return; |
| 2609 | } |
| 2610 | pos->mask = char_mask; |
| 2611 | pos->value = c; |
| 2612 | pos->determines_perfectly = true; |
| 2613 | } |
| 2614 | characters_filled_in++; |
| 2615 | DCHECK(characters_filled_in <= details->characters()); |
| 2616 | if (characters_filled_in == details->characters()) { |
| 2617 | return; |
| 2618 | } |
| 2619 | } |
| 2620 | } else { |
| 2621 | QuickCheckDetails::Position* pos = |
| 2622 | details->positions(characters_filled_in); |
| 2623 | RegExpCharacterClass* tree = elm.char_class(); |
| 2624 | ZoneList<CharacterRange>* ranges = tree->ranges(zone()); |
| 2625 | if (tree->is_negated()) { |
| 2626 | // A quick check uses multi-character mask and compare. There is no |
| 2627 | // useful way to incorporate a negative char class into this scheme |
| 2628 | // so we just conservatively create a mask and value that will always |
| 2629 | // succeed. |
| 2630 | pos->mask = 0; |
| 2631 | pos->value = 0; |
| 2632 | } else { |
| 2633 | int first_range = 0; |
| 2634 | while (ranges->at(first_range).from() > char_mask) { |
| 2635 | first_range++; |
| 2636 | if (first_range == ranges->length()) { |
| 2637 | details->set_cannot_match(); |
| 2638 | pos->determines_perfectly = false; |
| 2639 | return; |
| 2640 | } |
| 2641 | } |
| 2642 | CharacterRange range = ranges->at(first_range); |
| 2643 | uc16 from = range.from(); |
| 2644 | uc16 to = range.to(); |
| 2645 | if (to > char_mask) { |
| 2646 | to = char_mask; |
| 2647 | } |
| 2648 | uint32_t differing_bits = (from ^ to); |
| 2649 | // A mask and compare is only perfect if the differing bits form a |
| 2650 | // number like 00011111 with one single block of trailing 1s. |
| 2651 | if ((differing_bits & (differing_bits + 1)) == 0 && |
| 2652 | from + differing_bits == to) { |
| 2653 | pos->determines_perfectly = true; |
| 2654 | } |
| 2655 | uint32_t common_bits = ~SmearBitsRight(differing_bits); |
| 2656 | uint32_t bits = (from & common_bits); |
| 2657 | for (int i = first_range + 1; i < ranges->length(); i++) { |
| 2658 | CharacterRange range = ranges->at(i); |
| 2659 | uc16 from = range.from(); |
| 2660 | uc16 to = range.to(); |
| 2661 | if (from > char_mask) continue; |
| 2662 | if (to > char_mask) to = char_mask; |
| 2663 | // Here we are combining more ranges into the mask and compare |
| 2664 | // value. With each new range the mask becomes more sparse and |
| 2665 | // so the chances of a false positive rise. A character class |
| 2666 | // with multiple ranges is assumed never to be equivalent to a |
| 2667 | // mask and compare operation. |
| 2668 | pos->determines_perfectly = false; |
| 2669 | uint32_t new_common_bits = (from ^ to); |
| 2670 | new_common_bits = ~SmearBitsRight(new_common_bits); |
| 2671 | common_bits &= new_common_bits; |
| 2672 | bits &= new_common_bits; |
| 2673 | uint32_t differing_bits = (from & common_bits) ^ bits; |
| 2674 | common_bits ^= differing_bits; |
| 2675 | bits &= common_bits; |
| 2676 | } |
| 2677 | pos->mask = common_bits; |
| 2678 | pos->value = bits; |
| 2679 | } |
| 2680 | characters_filled_in++; |
| 2681 | DCHECK(characters_filled_in <= details->characters()); |
| 2682 | if (characters_filled_in == details->characters()) { |
| 2683 | return; |
| 2684 | } |
| 2685 | } |
| 2686 | } |
| 2687 | DCHECK(characters_filled_in != details->characters()); |
| 2688 | if (!details->cannot_match()) { |
| 2689 | on_success()-> GetQuickCheckDetails(details, |
| 2690 | compiler, |
| 2691 | characters_filled_in, |
| 2692 | true); |
| 2693 | } |
| 2694 | } |
| 2695 | |
| 2696 | |
| 2697 | void QuickCheckDetails::Clear() { |
| 2698 | for (int i = 0; i < characters_; i++) { |
| 2699 | positions_[i].mask = 0; |
| 2700 | positions_[i].value = 0; |
| 2701 | positions_[i].determines_perfectly = false; |
| 2702 | } |
| 2703 | characters_ = 0; |
| 2704 | } |
| 2705 | |
| 2706 | |
| 2707 | void QuickCheckDetails::Advance(int by, bool one_byte) { |
| 2708 | if (by >= characters_ || by < 0) { |
| 2709 | DCHECK_IMPLIES(by < 0, characters_ == 0); |
| 2710 | Clear(); |
| 2711 | return; |
| 2712 | } |
| 2713 | DCHECK_LE(characters_ - by, 4); |
| 2714 | DCHECK_LE(characters_, 4); |
| 2715 | for (int i = 0; i < characters_ - by; i++) { |
| 2716 | positions_[i] = positions_[by + i]; |
| 2717 | } |
| 2718 | for (int i = characters_ - by; i < characters_; i++) { |
| 2719 | positions_[i].mask = 0; |
| 2720 | positions_[i].value = 0; |
| 2721 | positions_[i].determines_perfectly = false; |
| 2722 | } |
| 2723 | characters_ -= by; |
| 2724 | // We could change mask_ and value_ here but we would never advance unless |
| 2725 | // they had already been used in a check and they won't be used again because |
| 2726 | // it would gain us nothing. So there's no point. |
| 2727 | } |
| 2728 | |
| 2729 | |
| 2730 | void QuickCheckDetails::Merge(QuickCheckDetails* other, int from_index) { |
| 2731 | DCHECK(characters_ == other->characters_); |
| 2732 | if (other->cannot_match_) { |
| 2733 | return; |
| 2734 | } |
| 2735 | if (cannot_match_) { |
| 2736 | *this = *other; |
| 2737 | return; |
| 2738 | } |
| 2739 | for (int i = from_index; i < characters_; i++) { |
| 2740 | QuickCheckDetails::Position* pos = positions(i); |
| 2741 | QuickCheckDetails::Position* other_pos = other->positions(i); |
| 2742 | if (pos->mask != other_pos->mask || |
| 2743 | pos->value != other_pos->value || |
| 2744 | !other_pos->determines_perfectly) { |
| 2745 | // Our mask-compare operation will be approximate unless we have the |
| 2746 | // exact same operation on both sides of the alternation. |
| 2747 | pos->determines_perfectly = false; |
| 2748 | } |
| 2749 | pos->mask &= other_pos->mask; |
| 2750 | pos->value &= pos->mask; |
| 2751 | other_pos->value &= pos->mask; |
| 2752 | uc16 differing_bits = (pos->value ^ other_pos->value); |
| 2753 | pos->mask &= ~differing_bits; |
| 2754 | pos->value &= pos->mask; |
| 2755 | } |
| 2756 | } |
| 2757 | |
| 2758 | |
| 2759 | class VisitMarker { |
| 2760 | public: |
| 2761 | explicit VisitMarker(NodeInfo* info) : info_(info) { |
| 2762 | DCHECK(!info->visited); |
| 2763 | info->visited = true; |
| 2764 | } |
| 2765 | ~VisitMarker() { |
| 2766 | info_->visited = false; |
| 2767 | } |
| 2768 | private: |
| 2769 | NodeInfo* info_; |
| 2770 | }; |
| 2771 | |
| 2772 | |
| 2773 | RegExpNode* SeqRegExpNode::FilterOneByte(int depth, bool ignore_case) { |
| 2774 | if (info()->replacement_calculated) return replacement(); |
| 2775 | if (depth < 0) return this; |
| 2776 | DCHECK(!info()->visited); |
| 2777 | VisitMarker marker(info()); |
| 2778 | return FilterSuccessor(depth - 1, ignore_case); |
| 2779 | } |
| 2780 | |
| 2781 | |
| 2782 | RegExpNode* SeqRegExpNode::FilterSuccessor(int depth, bool ignore_case) { |
| 2783 | RegExpNode* next = on_success_->FilterOneByte(depth - 1, ignore_case); |
| 2784 | if (next == NULL) return set_replacement(NULL); |
| 2785 | on_success_ = next; |
| 2786 | return set_replacement(this); |
| 2787 | } |
| 2788 | |
| 2789 | |
| 2790 | // We need to check for the following characters: 0x39c 0x3bc 0x178. |
| 2791 | static inline bool RangeContainsLatin1Equivalents(CharacterRange range) { |
| 2792 | // TODO(dcarney): this could be a lot more efficient. |
| 2793 | return range.Contains(0x39c) || |
| 2794 | range.Contains(0x3bc) || range.Contains(0x178); |
| 2795 | } |
| 2796 | |
| 2797 | |
| 2798 | static bool RangesContainLatin1Equivalents(ZoneList<CharacterRange>* ranges) { |
| 2799 | for (int i = 0; i < ranges->length(); i++) { |
| 2800 | // TODO(dcarney): this could be a lot more efficient. |
| 2801 | if (RangeContainsLatin1Equivalents(ranges->at(i))) return true; |
| 2802 | } |
| 2803 | return false; |
| 2804 | } |
| 2805 | |
| 2806 | |
| 2807 | RegExpNode* TextNode::FilterOneByte(int depth, bool ignore_case) { |
| 2808 | if (info()->replacement_calculated) return replacement(); |
| 2809 | if (depth < 0) return this; |
| 2810 | DCHECK(!info()->visited); |
| 2811 | VisitMarker marker(info()); |
| 2812 | int element_count = elements()->length(); |
| 2813 | for (int i = 0; i < element_count; i++) { |
| 2814 | TextElement elm = elements()->at(i); |
| 2815 | if (elm.text_type() == TextElement::ATOM) { |
| 2816 | Vector<const uc16> quarks = elm.atom()->data(); |
| 2817 | for (int j = 0; j < quarks.length(); j++) { |
| 2818 | uint16_t c = quarks[j]; |
| 2819 | if (c <= String::kMaxOneByteCharCode) continue; |
| 2820 | if (!ignore_case) return set_replacement(NULL); |
| 2821 | // Here, we need to check for characters whose upper and lower cases |
| 2822 | // are outside the Latin-1 range. |
| 2823 | uint16_t converted = unibrow::Latin1::ConvertNonLatin1ToLatin1(c); |
| 2824 | // Character is outside Latin-1 completely |
| 2825 | if (converted == 0) return set_replacement(NULL); |
| 2826 | // Convert quark to Latin-1 in place. |
| 2827 | uint16_t* copy = const_cast<uint16_t*>(quarks.start()); |
| 2828 | copy[j] = converted; |
| 2829 | } |
| 2830 | } else { |
| 2831 | DCHECK(elm.text_type() == TextElement::CHAR_CLASS); |
| 2832 | RegExpCharacterClass* cc = elm.char_class(); |
| 2833 | ZoneList<CharacterRange>* ranges = cc->ranges(zone()); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 2834 | CharacterRange::Canonicalize(ranges); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 2835 | // Now they are in order so we only need to look at the first. |
| 2836 | int range_count = ranges->length(); |
| 2837 | if (cc->is_negated()) { |
| 2838 | if (range_count != 0 && |
| 2839 | ranges->at(0).from() == 0 && |
| 2840 | ranges->at(0).to() >= String::kMaxOneByteCharCode) { |
| 2841 | // This will be handled in a later filter. |
| 2842 | if (ignore_case && RangesContainLatin1Equivalents(ranges)) continue; |
| 2843 | return set_replacement(NULL); |
| 2844 | } |
| 2845 | } else { |
| 2846 | if (range_count == 0 || |
| 2847 | ranges->at(0).from() > String::kMaxOneByteCharCode) { |
| 2848 | // This will be handled in a later filter. |
| 2849 | if (ignore_case && RangesContainLatin1Equivalents(ranges)) continue; |
| 2850 | return set_replacement(NULL); |
| 2851 | } |
| 2852 | } |
| 2853 | } |
| 2854 | } |
| 2855 | return FilterSuccessor(depth - 1, ignore_case); |
| 2856 | } |
| 2857 | |
| 2858 | |
| 2859 | RegExpNode* LoopChoiceNode::FilterOneByte(int depth, bool ignore_case) { |
| 2860 | if (info()->replacement_calculated) return replacement(); |
| 2861 | if (depth < 0) return this; |
| 2862 | if (info()->visited) return this; |
| 2863 | { |
| 2864 | VisitMarker marker(info()); |
| 2865 | |
| 2866 | RegExpNode* continue_replacement = |
| 2867 | continue_node_->FilterOneByte(depth - 1, ignore_case); |
| 2868 | // If we can't continue after the loop then there is no sense in doing the |
| 2869 | // loop. |
| 2870 | if (continue_replacement == NULL) return set_replacement(NULL); |
| 2871 | } |
| 2872 | |
| 2873 | return ChoiceNode::FilterOneByte(depth - 1, ignore_case); |
| 2874 | } |
| 2875 | |
| 2876 | |
| 2877 | RegExpNode* ChoiceNode::FilterOneByte(int depth, bool ignore_case) { |
| 2878 | if (info()->replacement_calculated) return replacement(); |
| 2879 | if (depth < 0) return this; |
| 2880 | if (info()->visited) return this; |
| 2881 | VisitMarker marker(info()); |
| 2882 | int choice_count = alternatives_->length(); |
| 2883 | |
| 2884 | for (int i = 0; i < choice_count; i++) { |
| 2885 | GuardedAlternative alternative = alternatives_->at(i); |
| 2886 | if (alternative.guards() != NULL && alternative.guards()->length() != 0) { |
| 2887 | set_replacement(this); |
| 2888 | return this; |
| 2889 | } |
| 2890 | } |
| 2891 | |
| 2892 | int surviving = 0; |
| 2893 | RegExpNode* survivor = NULL; |
| 2894 | for (int i = 0; i < choice_count; i++) { |
| 2895 | GuardedAlternative alternative = alternatives_->at(i); |
| 2896 | RegExpNode* replacement = |
| 2897 | alternative.node()->FilterOneByte(depth - 1, ignore_case); |
| 2898 | DCHECK(replacement != this); // No missing EMPTY_MATCH_CHECK. |
| 2899 | if (replacement != NULL) { |
| 2900 | alternatives_->at(i).set_node(replacement); |
| 2901 | surviving++; |
| 2902 | survivor = replacement; |
| 2903 | } |
| 2904 | } |
| 2905 | if (surviving < 2) return set_replacement(survivor); |
| 2906 | |
| 2907 | set_replacement(this); |
| 2908 | if (surviving == choice_count) { |
| 2909 | return this; |
| 2910 | } |
| 2911 | // Only some of the nodes survived the filtering. We need to rebuild the |
| 2912 | // alternatives list. |
| 2913 | ZoneList<GuardedAlternative>* new_alternatives = |
| 2914 | new(zone()) ZoneList<GuardedAlternative>(surviving, zone()); |
| 2915 | for (int i = 0; i < choice_count; i++) { |
| 2916 | RegExpNode* replacement = |
| 2917 | alternatives_->at(i).node()->FilterOneByte(depth - 1, ignore_case); |
| 2918 | if (replacement != NULL) { |
| 2919 | alternatives_->at(i).set_node(replacement); |
| 2920 | new_alternatives->Add(alternatives_->at(i), zone()); |
| 2921 | } |
| 2922 | } |
| 2923 | alternatives_ = new_alternatives; |
| 2924 | return this; |
| 2925 | } |
| 2926 | |
| 2927 | |
| 2928 | RegExpNode* NegativeLookaroundChoiceNode::FilterOneByte(int depth, |
| 2929 | bool ignore_case) { |
| 2930 | if (info()->replacement_calculated) return replacement(); |
| 2931 | if (depth < 0) return this; |
| 2932 | if (info()->visited) return this; |
| 2933 | VisitMarker marker(info()); |
| 2934 | // Alternative 0 is the negative lookahead, alternative 1 is what comes |
| 2935 | // afterwards. |
| 2936 | RegExpNode* node = alternatives_->at(1).node(); |
| 2937 | RegExpNode* replacement = node->FilterOneByte(depth - 1, ignore_case); |
| 2938 | if (replacement == NULL) return set_replacement(NULL); |
| 2939 | alternatives_->at(1).set_node(replacement); |
| 2940 | |
| 2941 | RegExpNode* neg_node = alternatives_->at(0).node(); |
| 2942 | RegExpNode* neg_replacement = neg_node->FilterOneByte(depth - 1, ignore_case); |
| 2943 | // If the negative lookahead is always going to fail then |
| 2944 | // we don't need to check it. |
| 2945 | if (neg_replacement == NULL) return set_replacement(replacement); |
| 2946 | alternatives_->at(0).set_node(neg_replacement); |
| 2947 | return set_replacement(this); |
| 2948 | } |
| 2949 | |
| 2950 | |
| 2951 | void LoopChoiceNode::GetQuickCheckDetails(QuickCheckDetails* details, |
| 2952 | RegExpCompiler* compiler, |
| 2953 | int characters_filled_in, |
| 2954 | bool not_at_start) { |
| 2955 | if (body_can_be_zero_length_ || info()->visited) return; |
| 2956 | VisitMarker marker(info()); |
| 2957 | return ChoiceNode::GetQuickCheckDetails(details, |
| 2958 | compiler, |
| 2959 | characters_filled_in, |
| 2960 | not_at_start); |
| 2961 | } |
| 2962 | |
| 2963 | |
| 2964 | void LoopChoiceNode::FillInBMInfo(Isolate* isolate, int offset, int budget, |
| 2965 | BoyerMooreLookahead* bm, bool not_at_start) { |
| 2966 | if (body_can_be_zero_length_ || budget <= 0) { |
| 2967 | bm->SetRest(offset); |
| 2968 | SaveBMInfo(bm, not_at_start, offset); |
| 2969 | return; |
| 2970 | } |
| 2971 | ChoiceNode::FillInBMInfo(isolate, offset, budget - 1, bm, not_at_start); |
| 2972 | SaveBMInfo(bm, not_at_start, offset); |
| 2973 | } |
| 2974 | |
| 2975 | |
| 2976 | void ChoiceNode::GetQuickCheckDetails(QuickCheckDetails* details, |
| 2977 | RegExpCompiler* compiler, |
| 2978 | int characters_filled_in, |
| 2979 | bool not_at_start) { |
| 2980 | not_at_start = (not_at_start || not_at_start_); |
| 2981 | int choice_count = alternatives_->length(); |
| 2982 | DCHECK(choice_count > 0); |
| 2983 | alternatives_->at(0).node()->GetQuickCheckDetails(details, |
| 2984 | compiler, |
| 2985 | characters_filled_in, |
| 2986 | not_at_start); |
| 2987 | for (int i = 1; i < choice_count; i++) { |
| 2988 | QuickCheckDetails new_details(details->characters()); |
| 2989 | RegExpNode* node = alternatives_->at(i).node(); |
| 2990 | node->GetQuickCheckDetails(&new_details, compiler, |
| 2991 | characters_filled_in, |
| 2992 | not_at_start); |
| 2993 | // Here we merge the quick match details of the two branches. |
| 2994 | details->Merge(&new_details, characters_filled_in); |
| 2995 | } |
| 2996 | } |
| 2997 | |
| 2998 | |
| 2999 | // Check for [0-9A-Z_a-z]. |
| 3000 | static void EmitWordCheck(RegExpMacroAssembler* assembler, |
| 3001 | Label* word, |
| 3002 | Label* non_word, |
| 3003 | bool fall_through_on_word) { |
| 3004 | if (assembler->CheckSpecialCharacterClass( |
| 3005 | fall_through_on_word ? 'w' : 'W', |
| 3006 | fall_through_on_word ? non_word : word)) { |
| 3007 | // Optimized implementation available. |
| 3008 | return; |
| 3009 | } |
| 3010 | assembler->CheckCharacterGT('z', non_word); |
| 3011 | assembler->CheckCharacterLT('0', non_word); |
| 3012 | assembler->CheckCharacterGT('a' - 1, word); |
| 3013 | assembler->CheckCharacterLT('9' + 1, word); |
| 3014 | assembler->CheckCharacterLT('A', non_word); |
| 3015 | assembler->CheckCharacterLT('Z' + 1, word); |
| 3016 | if (fall_through_on_word) { |
| 3017 | assembler->CheckNotCharacter('_', non_word); |
| 3018 | } else { |
| 3019 | assembler->CheckCharacter('_', word); |
| 3020 | } |
| 3021 | } |
| 3022 | |
| 3023 | |
| 3024 | // Emit the code to check for a ^ in multiline mode (1-character lookbehind |
| 3025 | // that matches newline or the start of input). |
| 3026 | static void EmitHat(RegExpCompiler* compiler, |
| 3027 | RegExpNode* on_success, |
| 3028 | Trace* trace) { |
| 3029 | RegExpMacroAssembler* assembler = compiler->macro_assembler(); |
| 3030 | // We will be loading the previous character into the current character |
| 3031 | // register. |
| 3032 | Trace new_trace(*trace); |
| 3033 | new_trace.InvalidateCurrentCharacter(); |
| 3034 | |
| 3035 | Label ok; |
| 3036 | if (new_trace.cp_offset() == 0) { |
| 3037 | // The start of input counts as a newline in this context, so skip to |
| 3038 | // ok if we are at the start. |
| 3039 | assembler->CheckAtStart(&ok); |
| 3040 | } |
| 3041 | // We already checked that we are not at the start of input so it must be |
| 3042 | // OK to load the previous character. |
| 3043 | assembler->LoadCurrentCharacter(new_trace.cp_offset() -1, |
| 3044 | new_trace.backtrack(), |
| 3045 | false); |
| 3046 | if (!assembler->CheckSpecialCharacterClass('n', |
| 3047 | new_trace.backtrack())) { |
| 3048 | // Newline means \n, \r, 0x2028 or 0x2029. |
| 3049 | if (!compiler->one_byte()) { |
| 3050 | assembler->CheckCharacterAfterAnd(0x2028, 0xfffe, &ok); |
| 3051 | } |
| 3052 | assembler->CheckCharacter('\n', &ok); |
| 3053 | assembler->CheckNotCharacter('\r', new_trace.backtrack()); |
| 3054 | } |
| 3055 | assembler->Bind(&ok); |
| 3056 | on_success->Emit(compiler, &new_trace); |
| 3057 | } |
| 3058 | |
| 3059 | |
| 3060 | // Emit the code to handle \b and \B (word-boundary or non-word-boundary). |
| 3061 | void AssertionNode::EmitBoundaryCheck(RegExpCompiler* compiler, Trace* trace) { |
| 3062 | RegExpMacroAssembler* assembler = compiler->macro_assembler(); |
| 3063 | Isolate* isolate = assembler->isolate(); |
| 3064 | Trace::TriBool next_is_word_character = Trace::UNKNOWN; |
| 3065 | bool not_at_start = (trace->at_start() == Trace::FALSE_VALUE); |
| 3066 | BoyerMooreLookahead* lookahead = bm_info(not_at_start); |
| 3067 | if (lookahead == NULL) { |
| 3068 | int eats_at_least = |
| 3069 | Min(kMaxLookaheadForBoyerMoore, EatsAtLeast(kMaxLookaheadForBoyerMoore, |
| 3070 | kRecursionBudget, |
| 3071 | not_at_start)); |
| 3072 | if (eats_at_least >= 1) { |
| 3073 | BoyerMooreLookahead* bm = |
| 3074 | new(zone()) BoyerMooreLookahead(eats_at_least, compiler, zone()); |
| 3075 | FillInBMInfo(isolate, 0, kRecursionBudget, bm, not_at_start); |
| 3076 | if (bm->at(0)->is_non_word()) |
| 3077 | next_is_word_character = Trace::FALSE_VALUE; |
| 3078 | if (bm->at(0)->is_word()) next_is_word_character = Trace::TRUE_VALUE; |
| 3079 | } |
| 3080 | } else { |
| 3081 | if (lookahead->at(0)->is_non_word()) |
| 3082 | next_is_word_character = Trace::FALSE_VALUE; |
| 3083 | if (lookahead->at(0)->is_word()) |
| 3084 | next_is_word_character = Trace::TRUE_VALUE; |
| 3085 | } |
| 3086 | bool at_boundary = (assertion_type_ == AssertionNode::AT_BOUNDARY); |
| 3087 | if (next_is_word_character == Trace::UNKNOWN) { |
| 3088 | Label before_non_word; |
| 3089 | Label before_word; |
| 3090 | if (trace->characters_preloaded() != 1) { |
| 3091 | assembler->LoadCurrentCharacter(trace->cp_offset(), &before_non_word); |
| 3092 | } |
| 3093 | // Fall through on non-word. |
| 3094 | EmitWordCheck(assembler, &before_word, &before_non_word, false); |
| 3095 | // Next character is not a word character. |
| 3096 | assembler->Bind(&before_non_word); |
| 3097 | Label ok; |
| 3098 | BacktrackIfPrevious(compiler, trace, at_boundary ? kIsNonWord : kIsWord); |
| 3099 | assembler->GoTo(&ok); |
| 3100 | |
| 3101 | assembler->Bind(&before_word); |
| 3102 | BacktrackIfPrevious(compiler, trace, at_boundary ? kIsWord : kIsNonWord); |
| 3103 | assembler->Bind(&ok); |
| 3104 | } else if (next_is_word_character == Trace::TRUE_VALUE) { |
| 3105 | BacktrackIfPrevious(compiler, trace, at_boundary ? kIsWord : kIsNonWord); |
| 3106 | } else { |
| 3107 | DCHECK(next_is_word_character == Trace::FALSE_VALUE); |
| 3108 | BacktrackIfPrevious(compiler, trace, at_boundary ? kIsNonWord : kIsWord); |
| 3109 | } |
| 3110 | } |
| 3111 | |
| 3112 | |
| 3113 | void AssertionNode::BacktrackIfPrevious( |
| 3114 | RegExpCompiler* compiler, |
| 3115 | Trace* trace, |
| 3116 | AssertionNode::IfPrevious backtrack_if_previous) { |
| 3117 | RegExpMacroAssembler* assembler = compiler->macro_assembler(); |
| 3118 | Trace new_trace(*trace); |
| 3119 | new_trace.InvalidateCurrentCharacter(); |
| 3120 | |
| 3121 | Label fall_through, dummy; |
| 3122 | |
| 3123 | Label* non_word = backtrack_if_previous == kIsNonWord ? |
| 3124 | new_trace.backtrack() : |
| 3125 | &fall_through; |
| 3126 | Label* word = backtrack_if_previous == kIsNonWord ? |
| 3127 | &fall_through : |
| 3128 | new_trace.backtrack(); |
| 3129 | |
| 3130 | if (new_trace.cp_offset() == 0) { |
| 3131 | // The start of input counts as a non-word character, so the question is |
| 3132 | // decided if we are at the start. |
| 3133 | assembler->CheckAtStart(non_word); |
| 3134 | } |
| 3135 | // We already checked that we are not at the start of input so it must be |
| 3136 | // OK to load the previous character. |
| 3137 | assembler->LoadCurrentCharacter(new_trace.cp_offset() - 1, &dummy, false); |
| 3138 | EmitWordCheck(assembler, word, non_word, backtrack_if_previous == kIsNonWord); |
| 3139 | |
| 3140 | assembler->Bind(&fall_through); |
| 3141 | on_success()->Emit(compiler, &new_trace); |
| 3142 | } |
| 3143 | |
| 3144 | |
| 3145 | void AssertionNode::GetQuickCheckDetails(QuickCheckDetails* details, |
| 3146 | RegExpCompiler* compiler, |
| 3147 | int filled_in, |
| 3148 | bool not_at_start) { |
| 3149 | if (assertion_type_ == AT_START && not_at_start) { |
| 3150 | details->set_cannot_match(); |
| 3151 | return; |
| 3152 | } |
| 3153 | return on_success()->GetQuickCheckDetails(details, |
| 3154 | compiler, |
| 3155 | filled_in, |
| 3156 | not_at_start); |
| 3157 | } |
| 3158 | |
| 3159 | |
| 3160 | void AssertionNode::Emit(RegExpCompiler* compiler, Trace* trace) { |
| 3161 | RegExpMacroAssembler* assembler = compiler->macro_assembler(); |
| 3162 | switch (assertion_type_) { |
| 3163 | case AT_END: { |
| 3164 | Label ok; |
| 3165 | assembler->CheckPosition(trace->cp_offset(), &ok); |
| 3166 | assembler->GoTo(trace->backtrack()); |
| 3167 | assembler->Bind(&ok); |
| 3168 | break; |
| 3169 | } |
| 3170 | case AT_START: { |
| 3171 | if (trace->at_start() == Trace::FALSE_VALUE) { |
| 3172 | assembler->GoTo(trace->backtrack()); |
| 3173 | return; |
| 3174 | } |
| 3175 | if (trace->at_start() == Trace::UNKNOWN) { |
| 3176 | assembler->CheckNotAtStart(trace->cp_offset(), trace->backtrack()); |
| 3177 | Trace at_start_trace = *trace; |
| 3178 | at_start_trace.set_at_start(Trace::TRUE_VALUE); |
| 3179 | on_success()->Emit(compiler, &at_start_trace); |
| 3180 | return; |
| 3181 | } |
| 3182 | } |
| 3183 | break; |
| 3184 | case AFTER_NEWLINE: |
| 3185 | EmitHat(compiler, on_success(), trace); |
| 3186 | return; |
| 3187 | case AT_BOUNDARY: |
| 3188 | case AT_NON_BOUNDARY: { |
| 3189 | EmitBoundaryCheck(compiler, trace); |
| 3190 | return; |
| 3191 | } |
| 3192 | } |
| 3193 | on_success()->Emit(compiler, trace); |
| 3194 | } |
| 3195 | |
| 3196 | |
| 3197 | static bool DeterminedAlready(QuickCheckDetails* quick_check, int offset) { |
| 3198 | if (quick_check == NULL) return false; |
| 3199 | if (offset >= quick_check->characters()) return false; |
| 3200 | return quick_check->positions(offset)->determines_perfectly; |
| 3201 | } |
| 3202 | |
| 3203 | |
| 3204 | static void UpdateBoundsCheck(int index, int* checked_up_to) { |
| 3205 | if (index > *checked_up_to) { |
| 3206 | *checked_up_to = index; |
| 3207 | } |
| 3208 | } |
| 3209 | |
| 3210 | |
| 3211 | // We call this repeatedly to generate code for each pass over the text node. |
| 3212 | // The passes are in increasing order of difficulty because we hope one |
| 3213 | // of the first passes will fail in which case we are saved the work of the |
| 3214 | // later passes. for example for the case independent regexp /%[asdfghjkl]a/ |
| 3215 | // we will check the '%' in the first pass, the case independent 'a' in the |
| 3216 | // second pass and the character class in the last pass. |
| 3217 | // |
| 3218 | // The passes are done from right to left, so for example to test for /bar/ |
| 3219 | // we will first test for an 'r' with offset 2, then an 'a' with offset 1 |
| 3220 | // and then a 'b' with offset 0. This means we can avoid the end-of-input |
| 3221 | // bounds check most of the time. In the example we only need to check for |
| 3222 | // end-of-input when loading the putative 'r'. |
| 3223 | // |
| 3224 | // A slight complication involves the fact that the first character may already |
| 3225 | // be fetched into a register by the previous node. In this case we want to |
| 3226 | // do the test for that character first. We do this in separate passes. The |
| 3227 | // 'preloaded' argument indicates that we are doing such a 'pass'. If such a |
| 3228 | // pass has been performed then subsequent passes will have true in |
| 3229 | // first_element_checked to indicate that that character does not need to be |
| 3230 | // checked again. |
| 3231 | // |
| 3232 | // In addition to all this we are passed a Trace, which can |
| 3233 | // contain an AlternativeGeneration object. In this AlternativeGeneration |
| 3234 | // object we can see details of any quick check that was already passed in |
| 3235 | // order to get to the code we are now generating. The quick check can involve |
| 3236 | // loading characters, which means we do not need to recheck the bounds |
| 3237 | // up to the limit the quick check already checked. In addition the quick |
| 3238 | // check can have involved a mask and compare operation which may simplify |
| 3239 | // or obviate the need for further checks at some character positions. |
| 3240 | void TextNode::TextEmitPass(RegExpCompiler* compiler, |
| 3241 | TextEmitPassType pass, |
| 3242 | bool preloaded, |
| 3243 | Trace* trace, |
| 3244 | bool first_element_checked, |
| 3245 | int* checked_up_to) { |
| 3246 | RegExpMacroAssembler* assembler = compiler->macro_assembler(); |
| 3247 | Isolate* isolate = assembler->isolate(); |
| 3248 | bool one_byte = compiler->one_byte(); |
| 3249 | Label* backtrack = trace->backtrack(); |
| 3250 | QuickCheckDetails* quick_check = trace->quick_check_performed(); |
| 3251 | int element_count = elements()->length(); |
| 3252 | int backward_offset = read_backward() ? -Length() : 0; |
| 3253 | for (int i = preloaded ? 0 : element_count - 1; i >= 0; i--) { |
| 3254 | TextElement elm = elements()->at(i); |
| 3255 | int cp_offset = trace->cp_offset() + elm.cp_offset() + backward_offset; |
| 3256 | if (elm.text_type() == TextElement::ATOM) { |
| 3257 | Vector<const uc16> quarks = elm.atom()->data(); |
| 3258 | for (int j = preloaded ? 0 : quarks.length() - 1; j >= 0; j--) { |
| 3259 | if (first_element_checked && i == 0 && j == 0) continue; |
| 3260 | if (DeterminedAlready(quick_check, elm.cp_offset() + j)) continue; |
| 3261 | EmitCharacterFunction* emit_function = NULL; |
| 3262 | switch (pass) { |
| 3263 | case NON_LATIN1_MATCH: |
| 3264 | DCHECK(one_byte); |
| 3265 | if (quarks[j] > String::kMaxOneByteCharCode) { |
| 3266 | assembler->GoTo(backtrack); |
| 3267 | return; |
| 3268 | } |
| 3269 | break; |
| 3270 | case NON_LETTER_CHARACTER_MATCH: |
| 3271 | emit_function = &EmitAtomNonLetter; |
| 3272 | break; |
| 3273 | case SIMPLE_CHARACTER_MATCH: |
| 3274 | emit_function = &EmitSimpleCharacter; |
| 3275 | break; |
| 3276 | case CASE_CHARACTER_MATCH: |
| 3277 | emit_function = &EmitAtomLetter; |
| 3278 | break; |
| 3279 | default: |
| 3280 | break; |
| 3281 | } |
| 3282 | if (emit_function != NULL) { |
| 3283 | bool bounds_check = *checked_up_to < cp_offset + j || read_backward(); |
| 3284 | bool bound_checked = |
| 3285 | emit_function(isolate, compiler, quarks[j], backtrack, |
| 3286 | cp_offset + j, bounds_check, preloaded); |
| 3287 | if (bound_checked) UpdateBoundsCheck(cp_offset + j, checked_up_to); |
| 3288 | } |
| 3289 | } |
| 3290 | } else { |
| 3291 | DCHECK_EQ(TextElement::CHAR_CLASS, elm.text_type()); |
| 3292 | if (pass == CHARACTER_CLASS_MATCH) { |
| 3293 | if (first_element_checked && i == 0) continue; |
| 3294 | if (DeterminedAlready(quick_check, elm.cp_offset())) continue; |
| 3295 | RegExpCharacterClass* cc = elm.char_class(); |
| 3296 | bool bounds_check = *checked_up_to < cp_offset || read_backward(); |
| 3297 | EmitCharClass(assembler, cc, one_byte, backtrack, cp_offset, |
| 3298 | bounds_check, preloaded, zone()); |
| 3299 | UpdateBoundsCheck(cp_offset, checked_up_to); |
| 3300 | } |
| 3301 | } |
| 3302 | } |
| 3303 | } |
| 3304 | |
| 3305 | |
| 3306 | int TextNode::Length() { |
| 3307 | TextElement elm = elements()->last(); |
| 3308 | DCHECK(elm.cp_offset() >= 0); |
| 3309 | return elm.cp_offset() + elm.length(); |
| 3310 | } |
| 3311 | |
| 3312 | |
| 3313 | bool TextNode::SkipPass(int int_pass, bool ignore_case) { |
| 3314 | TextEmitPassType pass = static_cast<TextEmitPassType>(int_pass); |
| 3315 | if (ignore_case) { |
| 3316 | return pass == SIMPLE_CHARACTER_MATCH; |
| 3317 | } else { |
| 3318 | return pass == NON_LETTER_CHARACTER_MATCH || pass == CASE_CHARACTER_MATCH; |
| 3319 | } |
| 3320 | } |
| 3321 | |
| 3322 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 3323 | TextNode* TextNode::CreateForCharacterRanges(Zone* zone, |
| 3324 | ZoneList<CharacterRange>* ranges, |
| 3325 | bool read_backward, |
| 3326 | RegExpNode* on_success) { |
| 3327 | DCHECK_NOT_NULL(ranges); |
| 3328 | ZoneList<TextElement>* elms = new (zone) ZoneList<TextElement>(1, zone); |
| 3329 | elms->Add( |
| 3330 | TextElement::CharClass(new (zone) RegExpCharacterClass(ranges, false)), |
| 3331 | zone); |
| 3332 | return new (zone) TextNode(elms, read_backward, on_success); |
| 3333 | } |
| 3334 | |
| 3335 | |
| 3336 | TextNode* TextNode::CreateForSurrogatePair(Zone* zone, CharacterRange lead, |
| 3337 | CharacterRange trail, |
| 3338 | bool read_backward, |
| 3339 | RegExpNode* on_success) { |
| 3340 | ZoneList<CharacterRange>* lead_ranges = CharacterRange::List(zone, lead); |
| 3341 | ZoneList<CharacterRange>* trail_ranges = CharacterRange::List(zone, trail); |
| 3342 | ZoneList<TextElement>* elms = new (zone) ZoneList<TextElement>(2, zone); |
| 3343 | elms->Add(TextElement::CharClass( |
| 3344 | new (zone) RegExpCharacterClass(lead_ranges, false)), |
| 3345 | zone); |
| 3346 | elms->Add(TextElement::CharClass( |
| 3347 | new (zone) RegExpCharacterClass(trail_ranges, false)), |
| 3348 | zone); |
| 3349 | return new (zone) TextNode(elms, read_backward, on_success); |
| 3350 | } |
| 3351 | |
| 3352 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 3353 | // This generates the code to match a text node. A text node can contain |
| 3354 | // straight character sequences (possibly to be matched in a case-independent |
| 3355 | // way) and character classes. For efficiency we do not do this in a single |
| 3356 | // pass from left to right. Instead we pass over the text node several times, |
| 3357 | // emitting code for some character positions every time. See the comment on |
| 3358 | // TextEmitPass for details. |
| 3359 | void TextNode::Emit(RegExpCompiler* compiler, Trace* trace) { |
| 3360 | LimitResult limit_result = LimitVersions(compiler, trace); |
| 3361 | if (limit_result == DONE) return; |
| 3362 | DCHECK(limit_result == CONTINUE); |
| 3363 | |
| 3364 | if (trace->cp_offset() + Length() > RegExpMacroAssembler::kMaxCPOffset) { |
| 3365 | compiler->SetRegExpTooBig(); |
| 3366 | return; |
| 3367 | } |
| 3368 | |
| 3369 | if (compiler->one_byte()) { |
| 3370 | int dummy = 0; |
| 3371 | TextEmitPass(compiler, NON_LATIN1_MATCH, false, trace, false, &dummy); |
| 3372 | } |
| 3373 | |
| 3374 | bool first_elt_done = false; |
| 3375 | int bound_checked_to = trace->cp_offset() - 1; |
| 3376 | bound_checked_to += trace->bound_checked_up_to(); |
| 3377 | |
| 3378 | // If a character is preloaded into the current character register then |
| 3379 | // check that now. |
| 3380 | if (trace->characters_preloaded() == 1) { |
| 3381 | for (int pass = kFirstRealPass; pass <= kLastPass; pass++) { |
| 3382 | if (!SkipPass(pass, compiler->ignore_case())) { |
| 3383 | TextEmitPass(compiler, |
| 3384 | static_cast<TextEmitPassType>(pass), |
| 3385 | true, |
| 3386 | trace, |
| 3387 | false, |
| 3388 | &bound_checked_to); |
| 3389 | } |
| 3390 | } |
| 3391 | first_elt_done = true; |
| 3392 | } |
| 3393 | |
| 3394 | for (int pass = kFirstRealPass; pass <= kLastPass; pass++) { |
| 3395 | if (!SkipPass(pass, compiler->ignore_case())) { |
| 3396 | TextEmitPass(compiler, |
| 3397 | static_cast<TextEmitPassType>(pass), |
| 3398 | false, |
| 3399 | trace, |
| 3400 | first_elt_done, |
| 3401 | &bound_checked_to); |
| 3402 | } |
| 3403 | } |
| 3404 | |
| 3405 | Trace successor_trace(*trace); |
| 3406 | // If we advance backward, we may end up at the start. |
| 3407 | successor_trace.AdvanceCurrentPositionInTrace( |
| 3408 | read_backward() ? -Length() : Length(), compiler); |
| 3409 | successor_trace.set_at_start(read_backward() ? Trace::UNKNOWN |
| 3410 | : Trace::FALSE_VALUE); |
| 3411 | RecursionCheck rc(compiler); |
| 3412 | on_success()->Emit(compiler, &successor_trace); |
| 3413 | } |
| 3414 | |
| 3415 | |
| 3416 | void Trace::InvalidateCurrentCharacter() { |
| 3417 | characters_preloaded_ = 0; |
| 3418 | } |
| 3419 | |
| 3420 | |
| 3421 | void Trace::AdvanceCurrentPositionInTrace(int by, RegExpCompiler* compiler) { |
| 3422 | // We don't have an instruction for shifting the current character register |
| 3423 | // down or for using a shifted value for anything so lets just forget that |
| 3424 | // we preloaded any characters into it. |
| 3425 | characters_preloaded_ = 0; |
| 3426 | // Adjust the offsets of the quick check performed information. This |
| 3427 | // information is used to find out what we already determined about the |
| 3428 | // characters by means of mask and compare. |
| 3429 | quick_check_performed_.Advance(by, compiler->one_byte()); |
| 3430 | cp_offset_ += by; |
| 3431 | if (cp_offset_ > RegExpMacroAssembler::kMaxCPOffset) { |
| 3432 | compiler->SetRegExpTooBig(); |
| 3433 | cp_offset_ = 0; |
| 3434 | } |
| 3435 | bound_checked_up_to_ = Max(0, bound_checked_up_to_ - by); |
| 3436 | } |
| 3437 | |
| 3438 | |
| 3439 | void TextNode::MakeCaseIndependent(Isolate* isolate, bool is_one_byte) { |
| 3440 | int element_count = elements()->length(); |
| 3441 | for (int i = 0; i < element_count; i++) { |
| 3442 | TextElement elm = elements()->at(i); |
| 3443 | if (elm.text_type() == TextElement::CHAR_CLASS) { |
| 3444 | RegExpCharacterClass* cc = elm.char_class(); |
| 3445 | // None of the standard character classes is different in the case |
| 3446 | // independent case and it slows us down if we don't know that. |
| 3447 | if (cc->is_standard(zone())) continue; |
| 3448 | ZoneList<CharacterRange>* ranges = cc->ranges(zone()); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 3449 | CharacterRange::AddCaseEquivalents(isolate, zone(), ranges, is_one_byte); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 3450 | } |
| 3451 | } |
| 3452 | } |
| 3453 | |
| 3454 | |
| 3455 | int TextNode::GreedyLoopTextLength() { return Length(); } |
| 3456 | |
| 3457 | |
| 3458 | RegExpNode* TextNode::GetSuccessorOfOmnivorousTextNode( |
| 3459 | RegExpCompiler* compiler) { |
| 3460 | if (read_backward()) return NULL; |
| 3461 | if (elements()->length() != 1) return NULL; |
| 3462 | TextElement elm = elements()->at(0); |
| 3463 | if (elm.text_type() != TextElement::CHAR_CLASS) return NULL; |
| 3464 | RegExpCharacterClass* node = elm.char_class(); |
| 3465 | ZoneList<CharacterRange>* ranges = node->ranges(zone()); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 3466 | CharacterRange::Canonicalize(ranges); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 3467 | if (node->is_negated()) { |
| 3468 | return ranges->length() == 0 ? on_success() : NULL; |
| 3469 | } |
| 3470 | if (ranges->length() != 1) return NULL; |
| 3471 | uint32_t max_char; |
| 3472 | if (compiler->one_byte()) { |
| 3473 | max_char = String::kMaxOneByteCharCode; |
| 3474 | } else { |
| 3475 | max_char = String::kMaxUtf16CodeUnit; |
| 3476 | } |
| 3477 | return ranges->at(0).IsEverything(max_char) ? on_success() : NULL; |
| 3478 | } |
| 3479 | |
| 3480 | |
| 3481 | // Finds the fixed match length of a sequence of nodes that goes from |
| 3482 | // this alternative and back to this choice node. If there are variable |
| 3483 | // length nodes or other complications in the way then return a sentinel |
| 3484 | // value indicating that a greedy loop cannot be constructed. |
| 3485 | int ChoiceNode::GreedyLoopTextLengthForAlternative( |
| 3486 | GuardedAlternative* alternative) { |
| 3487 | int length = 0; |
| 3488 | RegExpNode* node = alternative->node(); |
| 3489 | // Later we will generate code for all these text nodes using recursion |
| 3490 | // so we have to limit the max number. |
| 3491 | int recursion_depth = 0; |
| 3492 | while (node != this) { |
| 3493 | if (recursion_depth++ > RegExpCompiler::kMaxRecursion) { |
| 3494 | return kNodeIsTooComplexForGreedyLoops; |
| 3495 | } |
| 3496 | int node_length = node->GreedyLoopTextLength(); |
| 3497 | if (node_length == kNodeIsTooComplexForGreedyLoops) { |
| 3498 | return kNodeIsTooComplexForGreedyLoops; |
| 3499 | } |
| 3500 | length += node_length; |
| 3501 | SeqRegExpNode* seq_node = static_cast<SeqRegExpNode*>(node); |
| 3502 | node = seq_node->on_success(); |
| 3503 | } |
| 3504 | return read_backward() ? -length : length; |
| 3505 | } |
| 3506 | |
| 3507 | |
| 3508 | void LoopChoiceNode::AddLoopAlternative(GuardedAlternative alt) { |
| 3509 | DCHECK_NULL(loop_node_); |
| 3510 | AddAlternative(alt); |
| 3511 | loop_node_ = alt.node(); |
| 3512 | } |
| 3513 | |
| 3514 | |
| 3515 | void LoopChoiceNode::AddContinueAlternative(GuardedAlternative alt) { |
| 3516 | DCHECK_NULL(continue_node_); |
| 3517 | AddAlternative(alt); |
| 3518 | continue_node_ = alt.node(); |
| 3519 | } |
| 3520 | |
| 3521 | |
| 3522 | void LoopChoiceNode::Emit(RegExpCompiler* compiler, Trace* trace) { |
| 3523 | RegExpMacroAssembler* macro_assembler = compiler->macro_assembler(); |
| 3524 | if (trace->stop_node() == this) { |
| 3525 | // Back edge of greedy optimized loop node graph. |
| 3526 | int text_length = |
| 3527 | GreedyLoopTextLengthForAlternative(&(alternatives_->at(0))); |
| 3528 | DCHECK(text_length != kNodeIsTooComplexForGreedyLoops); |
| 3529 | // Update the counter-based backtracking info on the stack. This is an |
| 3530 | // optimization for greedy loops (see below). |
| 3531 | DCHECK(trace->cp_offset() == text_length); |
| 3532 | macro_assembler->AdvanceCurrentPosition(text_length); |
| 3533 | macro_assembler->GoTo(trace->loop_label()); |
| 3534 | return; |
| 3535 | } |
| 3536 | DCHECK_NULL(trace->stop_node()); |
| 3537 | if (!trace->is_trivial()) { |
| 3538 | trace->Flush(compiler, this); |
| 3539 | return; |
| 3540 | } |
| 3541 | ChoiceNode::Emit(compiler, trace); |
| 3542 | } |
| 3543 | |
| 3544 | |
| 3545 | int ChoiceNode::CalculatePreloadCharacters(RegExpCompiler* compiler, |
| 3546 | int eats_at_least) { |
| 3547 | int preload_characters = Min(4, eats_at_least); |
| 3548 | if (compiler->macro_assembler()->CanReadUnaligned()) { |
| 3549 | bool one_byte = compiler->one_byte(); |
| 3550 | if (one_byte) { |
| 3551 | if (preload_characters > 4) preload_characters = 4; |
| 3552 | // We can't preload 3 characters because there is no machine instruction |
| 3553 | // to do that. We can't just load 4 because we could be reading |
| 3554 | // beyond the end of the string, which could cause a memory fault. |
| 3555 | if (preload_characters == 3) preload_characters = 2; |
| 3556 | } else { |
| 3557 | if (preload_characters > 2) preload_characters = 2; |
| 3558 | } |
| 3559 | } else { |
| 3560 | if (preload_characters > 1) preload_characters = 1; |
| 3561 | } |
| 3562 | return preload_characters; |
| 3563 | } |
| 3564 | |
| 3565 | |
| 3566 | // This class is used when generating the alternatives in a choice node. It |
| 3567 | // records the way the alternative is being code generated. |
| 3568 | class AlternativeGeneration: public Malloced { |
| 3569 | public: |
| 3570 | AlternativeGeneration() |
| 3571 | : possible_success(), |
| 3572 | expects_preload(false), |
| 3573 | after(), |
| 3574 | quick_check_details() { } |
| 3575 | Label possible_success; |
| 3576 | bool expects_preload; |
| 3577 | Label after; |
| 3578 | QuickCheckDetails quick_check_details; |
| 3579 | }; |
| 3580 | |
| 3581 | |
| 3582 | // Creates a list of AlternativeGenerations. If the list has a reasonable |
| 3583 | // size then it is on the stack, otherwise the excess is on the heap. |
| 3584 | class AlternativeGenerationList { |
| 3585 | public: |
| 3586 | AlternativeGenerationList(int count, Zone* zone) |
| 3587 | : alt_gens_(count, zone) { |
| 3588 | for (int i = 0; i < count && i < kAFew; i++) { |
| 3589 | alt_gens_.Add(a_few_alt_gens_ + i, zone); |
| 3590 | } |
| 3591 | for (int i = kAFew; i < count; i++) { |
| 3592 | alt_gens_.Add(new AlternativeGeneration(), zone); |
| 3593 | } |
| 3594 | } |
| 3595 | ~AlternativeGenerationList() { |
| 3596 | for (int i = kAFew; i < alt_gens_.length(); i++) { |
| 3597 | delete alt_gens_[i]; |
| 3598 | alt_gens_[i] = NULL; |
| 3599 | } |
| 3600 | } |
| 3601 | |
| 3602 | AlternativeGeneration* at(int i) { |
| 3603 | return alt_gens_[i]; |
| 3604 | } |
| 3605 | |
| 3606 | private: |
| 3607 | static const int kAFew = 10; |
| 3608 | ZoneList<AlternativeGeneration*> alt_gens_; |
| 3609 | AlternativeGeneration a_few_alt_gens_[kAFew]; |
| 3610 | }; |
| 3611 | |
| 3612 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 3613 | static const uc32 kRangeEndMarker = 0x110000; |
| 3614 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 3615 | // The '2' variant is has inclusive from and exclusive to. |
| 3616 | // This covers \s as defined in ECMA-262 5.1, 15.10.2.12, |
| 3617 | // which include WhiteSpace (7.2) or LineTerminator (7.3) values. |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 3618 | static const int kSpaceRanges[] = { |
| 3619 | '\t', '\r' + 1, ' ', ' ' + 1, 0x00A0, 0x00A1, 0x1680, 0x1681, |
| 3620 | 0x180E, 0x180F, 0x2000, 0x200B, 0x2028, 0x202A, 0x202F, 0x2030, |
| 3621 | 0x205F, 0x2060, 0x3000, 0x3001, 0xFEFF, 0xFF00, kRangeEndMarker}; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 3622 | static const int kSpaceRangeCount = arraysize(kSpaceRanges); |
| 3623 | |
| 3624 | static const int kWordRanges[] = { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 3625 | '0', '9' + 1, 'A', 'Z' + 1, '_', '_' + 1, 'a', 'z' + 1, kRangeEndMarker}; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 3626 | static const int kWordRangeCount = arraysize(kWordRanges); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 3627 | static const int kDigitRanges[] = {'0', '9' + 1, kRangeEndMarker}; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 3628 | static const int kDigitRangeCount = arraysize(kDigitRanges); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 3629 | static const int kSurrogateRanges[] = { |
| 3630 | kLeadSurrogateStart, kLeadSurrogateStart + 1, kRangeEndMarker}; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 3631 | static const int kSurrogateRangeCount = arraysize(kSurrogateRanges); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 3632 | static const int kLineTerminatorRanges[] = { |
| 3633 | 0x000A, 0x000B, 0x000D, 0x000E, 0x2028, 0x202A, kRangeEndMarker}; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 3634 | static const int kLineTerminatorRangeCount = arraysize(kLineTerminatorRanges); |
| 3635 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 3636 | void BoyerMoorePositionInfo::Set(int character) { |
| 3637 | SetInterval(Interval(character, character)); |
| 3638 | } |
| 3639 | |
| 3640 | |
| 3641 | void BoyerMoorePositionInfo::SetInterval(const Interval& interval) { |
| 3642 | s_ = AddRange(s_, kSpaceRanges, kSpaceRangeCount, interval); |
| 3643 | w_ = AddRange(w_, kWordRanges, kWordRangeCount, interval); |
| 3644 | d_ = AddRange(d_, kDigitRanges, kDigitRangeCount, interval); |
| 3645 | surrogate_ = |
| 3646 | AddRange(surrogate_, kSurrogateRanges, kSurrogateRangeCount, interval); |
| 3647 | if (interval.to() - interval.from() >= kMapSize - 1) { |
| 3648 | if (map_count_ != kMapSize) { |
| 3649 | map_count_ = kMapSize; |
| 3650 | for (int i = 0; i < kMapSize; i++) map_->at(i) = true; |
| 3651 | } |
| 3652 | return; |
| 3653 | } |
| 3654 | for (int i = interval.from(); i <= interval.to(); i++) { |
| 3655 | int mod_character = (i & kMask); |
| 3656 | if (!map_->at(mod_character)) { |
| 3657 | map_count_++; |
| 3658 | map_->at(mod_character) = true; |
| 3659 | } |
| 3660 | if (map_count_ == kMapSize) return; |
| 3661 | } |
| 3662 | } |
| 3663 | |
| 3664 | |
| 3665 | void BoyerMoorePositionInfo::SetAll() { |
| 3666 | s_ = w_ = d_ = kLatticeUnknown; |
| 3667 | if (map_count_ != kMapSize) { |
| 3668 | map_count_ = kMapSize; |
| 3669 | for (int i = 0; i < kMapSize; i++) map_->at(i) = true; |
| 3670 | } |
| 3671 | } |
| 3672 | |
| 3673 | |
| 3674 | BoyerMooreLookahead::BoyerMooreLookahead( |
| 3675 | int length, RegExpCompiler* compiler, Zone* zone) |
| 3676 | : length_(length), |
| 3677 | compiler_(compiler) { |
| 3678 | if (compiler->one_byte()) { |
| 3679 | max_char_ = String::kMaxOneByteCharCode; |
| 3680 | } else { |
| 3681 | max_char_ = String::kMaxUtf16CodeUnit; |
| 3682 | } |
| 3683 | bitmaps_ = new(zone) ZoneList<BoyerMoorePositionInfo*>(length, zone); |
| 3684 | for (int i = 0; i < length; i++) { |
| 3685 | bitmaps_->Add(new(zone) BoyerMoorePositionInfo(zone), zone); |
| 3686 | } |
| 3687 | } |
| 3688 | |
| 3689 | |
| 3690 | // Find the longest range of lookahead that has the fewest number of different |
| 3691 | // characters that can occur at a given position. Since we are optimizing two |
| 3692 | // different parameters at once this is a tradeoff. |
| 3693 | bool BoyerMooreLookahead::FindWorthwhileInterval(int* from, int* to) { |
| 3694 | int biggest_points = 0; |
| 3695 | // If more than 32 characters out of 128 can occur it is unlikely that we can |
| 3696 | // be lucky enough to step forwards much of the time. |
| 3697 | const int kMaxMax = 32; |
| 3698 | for (int max_number_of_chars = 4; |
| 3699 | max_number_of_chars < kMaxMax; |
| 3700 | max_number_of_chars *= 2) { |
| 3701 | biggest_points = |
| 3702 | FindBestInterval(max_number_of_chars, biggest_points, from, to); |
| 3703 | } |
| 3704 | if (biggest_points == 0) return false; |
| 3705 | return true; |
| 3706 | } |
| 3707 | |
| 3708 | |
| 3709 | // Find the highest-points range between 0 and length_ where the character |
| 3710 | // information is not too vague. 'Too vague' means that there are more than |
| 3711 | // max_number_of_chars that can occur at this position. Calculates the number |
| 3712 | // of points as the product of width-of-the-range and |
| 3713 | // probability-of-finding-one-of-the-characters, where the probability is |
| 3714 | // calculated using the frequency distribution of the sample subject string. |
| 3715 | int BoyerMooreLookahead::FindBestInterval( |
| 3716 | int max_number_of_chars, int old_biggest_points, int* from, int* to) { |
| 3717 | int biggest_points = old_biggest_points; |
| 3718 | static const int kSize = RegExpMacroAssembler::kTableSize; |
| 3719 | for (int i = 0; i < length_; ) { |
| 3720 | while (i < length_ && Count(i) > max_number_of_chars) i++; |
| 3721 | if (i == length_) break; |
| 3722 | int remembered_from = i; |
| 3723 | bool union_map[kSize]; |
| 3724 | for (int j = 0; j < kSize; j++) union_map[j] = false; |
| 3725 | while (i < length_ && Count(i) <= max_number_of_chars) { |
| 3726 | BoyerMoorePositionInfo* map = bitmaps_->at(i); |
| 3727 | for (int j = 0; j < kSize; j++) union_map[j] |= map->at(j); |
| 3728 | i++; |
| 3729 | } |
| 3730 | int frequency = 0; |
| 3731 | for (int j = 0; j < kSize; j++) { |
| 3732 | if (union_map[j]) { |
| 3733 | // Add 1 to the frequency to give a small per-character boost for |
| 3734 | // the cases where our sampling is not good enough and many |
| 3735 | // characters have a frequency of zero. This means the frequency |
| 3736 | // can theoretically be up to 2*kSize though we treat it mostly as |
| 3737 | // a fraction of kSize. |
| 3738 | frequency += compiler_->frequency_collator()->Frequency(j) + 1; |
| 3739 | } |
| 3740 | } |
| 3741 | // We use the probability of skipping times the distance we are skipping to |
| 3742 | // judge the effectiveness of this. Actually we have a cut-off: By |
| 3743 | // dividing by 2 we switch off the skipping if the probability of skipping |
| 3744 | // is less than 50%. This is because the multibyte mask-and-compare |
| 3745 | // skipping in quickcheck is more likely to do well on this case. |
| 3746 | bool in_quickcheck_range = |
| 3747 | ((i - remembered_from < 4) || |
| 3748 | (compiler_->one_byte() ? remembered_from <= 4 : remembered_from <= 2)); |
| 3749 | // Called 'probability' but it is only a rough estimate and can actually |
| 3750 | // be outside the 0-kSize range. |
| 3751 | int probability = (in_quickcheck_range ? kSize / 2 : kSize) - frequency; |
| 3752 | int points = (i - remembered_from) * probability; |
| 3753 | if (points > biggest_points) { |
| 3754 | *from = remembered_from; |
| 3755 | *to = i - 1; |
| 3756 | biggest_points = points; |
| 3757 | } |
| 3758 | } |
| 3759 | return biggest_points; |
| 3760 | } |
| 3761 | |
| 3762 | |
| 3763 | // Take all the characters that will not prevent a successful match if they |
| 3764 | // occur in the subject string in the range between min_lookahead and |
| 3765 | // max_lookahead (inclusive) measured from the current position. If the |
| 3766 | // character at max_lookahead offset is not one of these characters, then we |
| 3767 | // can safely skip forwards by the number of characters in the range. |
| 3768 | int BoyerMooreLookahead::GetSkipTable(int min_lookahead, |
| 3769 | int max_lookahead, |
| 3770 | Handle<ByteArray> boolean_skip_table) { |
| 3771 | const int kSize = RegExpMacroAssembler::kTableSize; |
| 3772 | |
| 3773 | const int kSkipArrayEntry = 0; |
| 3774 | const int kDontSkipArrayEntry = 1; |
| 3775 | |
| 3776 | for (int i = 0; i < kSize; i++) { |
| 3777 | boolean_skip_table->set(i, kSkipArrayEntry); |
| 3778 | } |
| 3779 | int skip = max_lookahead + 1 - min_lookahead; |
| 3780 | |
| 3781 | for (int i = max_lookahead; i >= min_lookahead; i--) { |
| 3782 | BoyerMoorePositionInfo* map = bitmaps_->at(i); |
| 3783 | for (int j = 0; j < kSize; j++) { |
| 3784 | if (map->at(j)) { |
| 3785 | boolean_skip_table->set(j, kDontSkipArrayEntry); |
| 3786 | } |
| 3787 | } |
| 3788 | } |
| 3789 | |
| 3790 | return skip; |
| 3791 | } |
| 3792 | |
| 3793 | |
| 3794 | // See comment above on the implementation of GetSkipTable. |
| 3795 | void BoyerMooreLookahead::EmitSkipInstructions(RegExpMacroAssembler* masm) { |
| 3796 | const int kSize = RegExpMacroAssembler::kTableSize; |
| 3797 | |
| 3798 | int min_lookahead = 0; |
| 3799 | int max_lookahead = 0; |
| 3800 | |
| 3801 | if (!FindWorthwhileInterval(&min_lookahead, &max_lookahead)) return; |
| 3802 | |
| 3803 | bool found_single_character = false; |
| 3804 | int single_character = 0; |
| 3805 | for (int i = max_lookahead; i >= min_lookahead; i--) { |
| 3806 | BoyerMoorePositionInfo* map = bitmaps_->at(i); |
| 3807 | if (map->map_count() > 1 || |
| 3808 | (found_single_character && map->map_count() != 0)) { |
| 3809 | found_single_character = false; |
| 3810 | break; |
| 3811 | } |
| 3812 | for (int j = 0; j < kSize; j++) { |
| 3813 | if (map->at(j)) { |
| 3814 | found_single_character = true; |
| 3815 | single_character = j; |
| 3816 | break; |
| 3817 | } |
| 3818 | } |
| 3819 | } |
| 3820 | |
| 3821 | int lookahead_width = max_lookahead + 1 - min_lookahead; |
| 3822 | |
| 3823 | if (found_single_character && lookahead_width == 1 && max_lookahead < 3) { |
| 3824 | // The mask-compare can probably handle this better. |
| 3825 | return; |
| 3826 | } |
| 3827 | |
| 3828 | if (found_single_character) { |
| 3829 | Label cont, again; |
| 3830 | masm->Bind(&again); |
| 3831 | masm->LoadCurrentCharacter(max_lookahead, &cont, true); |
| 3832 | if (max_char_ > kSize) { |
| 3833 | masm->CheckCharacterAfterAnd(single_character, |
| 3834 | RegExpMacroAssembler::kTableMask, |
| 3835 | &cont); |
| 3836 | } else { |
| 3837 | masm->CheckCharacter(single_character, &cont); |
| 3838 | } |
| 3839 | masm->AdvanceCurrentPosition(lookahead_width); |
| 3840 | masm->GoTo(&again); |
| 3841 | masm->Bind(&cont); |
| 3842 | return; |
| 3843 | } |
| 3844 | |
| 3845 | Factory* factory = masm->isolate()->factory(); |
| 3846 | Handle<ByteArray> boolean_skip_table = factory->NewByteArray(kSize, TENURED); |
| 3847 | int skip_distance = GetSkipTable( |
| 3848 | min_lookahead, max_lookahead, boolean_skip_table); |
| 3849 | DCHECK(skip_distance != 0); |
| 3850 | |
| 3851 | Label cont, again; |
| 3852 | masm->Bind(&again); |
| 3853 | masm->LoadCurrentCharacter(max_lookahead, &cont, true); |
| 3854 | masm->CheckBitInTable(boolean_skip_table, &cont); |
| 3855 | masm->AdvanceCurrentPosition(skip_distance); |
| 3856 | masm->GoTo(&again); |
| 3857 | masm->Bind(&cont); |
| 3858 | } |
| 3859 | |
| 3860 | |
| 3861 | /* Code generation for choice nodes. |
| 3862 | * |
| 3863 | * We generate quick checks that do a mask and compare to eliminate a |
| 3864 | * choice. If the quick check succeeds then it jumps to the continuation to |
| 3865 | * do slow checks and check subsequent nodes. If it fails (the common case) |
| 3866 | * it falls through to the next choice. |
| 3867 | * |
| 3868 | * Here is the desired flow graph. Nodes directly below each other imply |
| 3869 | * fallthrough. Alternatives 1 and 2 have quick checks. Alternative |
| 3870 | * 3 doesn't have a quick check so we have to call the slow check. |
| 3871 | * Nodes are marked Qn for quick checks and Sn for slow checks. The entire |
| 3872 | * regexp continuation is generated directly after the Sn node, up to the |
| 3873 | * next GoTo if we decide to reuse some already generated code. Some |
| 3874 | * nodes expect preload_characters to be preloaded into the current |
| 3875 | * character register. R nodes do this preloading. Vertices are marked |
| 3876 | * F for failures and S for success (possible success in the case of quick |
| 3877 | * nodes). L, V, < and > are used as arrow heads. |
| 3878 | * |
| 3879 | * ----------> R |
| 3880 | * | |
| 3881 | * V |
| 3882 | * Q1 -----> S1 |
| 3883 | * | S / |
| 3884 | * F| / |
| 3885 | * | F/ |
| 3886 | * | / |
| 3887 | * | R |
| 3888 | * | / |
| 3889 | * V L |
| 3890 | * Q2 -----> S2 |
| 3891 | * | S / |
| 3892 | * F| / |
| 3893 | * | F/ |
| 3894 | * | / |
| 3895 | * | R |
| 3896 | * | / |
| 3897 | * V L |
| 3898 | * S3 |
| 3899 | * | |
| 3900 | * F| |
| 3901 | * | |
| 3902 | * R |
| 3903 | * | |
| 3904 | * backtrack V |
| 3905 | * <----------Q4 |
| 3906 | * \ F | |
| 3907 | * \ |S |
| 3908 | * \ F V |
| 3909 | * \-----S4 |
| 3910 | * |
| 3911 | * For greedy loops we push the current position, then generate the code that |
| 3912 | * eats the input specially in EmitGreedyLoop. The other choice (the |
| 3913 | * continuation) is generated by the normal code in EmitChoices, and steps back |
| 3914 | * in the input to the starting position when it fails to match. The loop code |
| 3915 | * looks like this (U is the unwind code that steps back in the greedy loop). |
| 3916 | * |
| 3917 | * _____ |
| 3918 | * / \ |
| 3919 | * V | |
| 3920 | * ----------> S1 | |
| 3921 | * /| | |
| 3922 | * / |S | |
| 3923 | * F/ \_____/ |
| 3924 | * / |
| 3925 | * |<----- |
| 3926 | * | \ |
| 3927 | * V |S |
| 3928 | * Q2 ---> U----->backtrack |
| 3929 | * | F / |
| 3930 | * S| / |
| 3931 | * V F / |
| 3932 | * S2--/ |
| 3933 | */ |
| 3934 | |
| 3935 | GreedyLoopState::GreedyLoopState(bool not_at_start) { |
| 3936 | counter_backtrack_trace_.set_backtrack(&label_); |
| 3937 | if (not_at_start) counter_backtrack_trace_.set_at_start(Trace::FALSE_VALUE); |
| 3938 | } |
| 3939 | |
| 3940 | |
| 3941 | void ChoiceNode::AssertGuardsMentionRegisters(Trace* trace) { |
| 3942 | #ifdef DEBUG |
| 3943 | int choice_count = alternatives_->length(); |
| 3944 | for (int i = 0; i < choice_count - 1; i++) { |
| 3945 | GuardedAlternative alternative = alternatives_->at(i); |
| 3946 | ZoneList<Guard*>* guards = alternative.guards(); |
| 3947 | int guard_count = (guards == NULL) ? 0 : guards->length(); |
| 3948 | for (int j = 0; j < guard_count; j++) { |
| 3949 | DCHECK(!trace->mentions_reg(guards->at(j)->reg())); |
| 3950 | } |
| 3951 | } |
| 3952 | #endif |
| 3953 | } |
| 3954 | |
| 3955 | |
| 3956 | void ChoiceNode::SetUpPreLoad(RegExpCompiler* compiler, |
| 3957 | Trace* current_trace, |
| 3958 | PreloadState* state) { |
| 3959 | if (state->eats_at_least_ == PreloadState::kEatsAtLeastNotYetInitialized) { |
| 3960 | // Save some time by looking at most one machine word ahead. |
| 3961 | state->eats_at_least_ = |
| 3962 | EatsAtLeast(compiler->one_byte() ? 4 : 2, kRecursionBudget, |
| 3963 | current_trace->at_start() == Trace::FALSE_VALUE); |
| 3964 | } |
| 3965 | state->preload_characters_ = |
| 3966 | CalculatePreloadCharacters(compiler, state->eats_at_least_); |
| 3967 | |
| 3968 | state->preload_is_current_ = |
| 3969 | (current_trace->characters_preloaded() == state->preload_characters_); |
| 3970 | state->preload_has_checked_bounds_ = state->preload_is_current_; |
| 3971 | } |
| 3972 | |
| 3973 | |
| 3974 | void ChoiceNode::Emit(RegExpCompiler* compiler, Trace* trace) { |
| 3975 | int choice_count = alternatives_->length(); |
| 3976 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 3977 | if (choice_count == 1 && alternatives_->at(0).guards() == NULL) { |
| 3978 | alternatives_->at(0).node()->Emit(compiler, trace); |
| 3979 | return; |
| 3980 | } |
| 3981 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 3982 | AssertGuardsMentionRegisters(trace); |
| 3983 | |
| 3984 | LimitResult limit_result = LimitVersions(compiler, trace); |
| 3985 | if (limit_result == DONE) return; |
| 3986 | DCHECK(limit_result == CONTINUE); |
| 3987 | |
| 3988 | // For loop nodes we already flushed (see LoopChoiceNode::Emit), but for |
| 3989 | // other choice nodes we only flush if we are out of code size budget. |
| 3990 | if (trace->flush_budget() == 0 && trace->actions() != NULL) { |
| 3991 | trace->Flush(compiler, this); |
| 3992 | return; |
| 3993 | } |
| 3994 | |
| 3995 | RecursionCheck rc(compiler); |
| 3996 | |
| 3997 | PreloadState preload; |
| 3998 | preload.init(); |
| 3999 | GreedyLoopState greedy_loop_state(not_at_start()); |
| 4000 | |
| 4001 | int text_length = GreedyLoopTextLengthForAlternative(&alternatives_->at(0)); |
| 4002 | AlternativeGenerationList alt_gens(choice_count, zone()); |
| 4003 | |
| 4004 | if (choice_count > 1 && text_length != kNodeIsTooComplexForGreedyLoops) { |
| 4005 | trace = EmitGreedyLoop(compiler, |
| 4006 | trace, |
| 4007 | &alt_gens, |
| 4008 | &preload, |
| 4009 | &greedy_loop_state, |
| 4010 | text_length); |
| 4011 | } else { |
| 4012 | // TODO(erikcorry): Delete this. We don't need this label, but it makes us |
| 4013 | // match the traces produced pre-cleanup. |
| 4014 | Label second_choice; |
| 4015 | compiler->macro_assembler()->Bind(&second_choice); |
| 4016 | |
| 4017 | preload.eats_at_least_ = EmitOptimizedUnanchoredSearch(compiler, trace); |
| 4018 | |
| 4019 | EmitChoices(compiler, |
| 4020 | &alt_gens, |
| 4021 | 0, |
| 4022 | trace, |
| 4023 | &preload); |
| 4024 | } |
| 4025 | |
| 4026 | // At this point we need to generate slow checks for the alternatives where |
| 4027 | // the quick check was inlined. We can recognize these because the associated |
| 4028 | // label was bound. |
| 4029 | int new_flush_budget = trace->flush_budget() / choice_count; |
| 4030 | for (int i = 0; i < choice_count; i++) { |
| 4031 | AlternativeGeneration* alt_gen = alt_gens.at(i); |
| 4032 | Trace new_trace(*trace); |
| 4033 | // If there are actions to be flushed we have to limit how many times |
| 4034 | // they are flushed. Take the budget of the parent trace and distribute |
| 4035 | // it fairly amongst the children. |
| 4036 | if (new_trace.actions() != NULL) { |
| 4037 | new_trace.set_flush_budget(new_flush_budget); |
| 4038 | } |
| 4039 | bool next_expects_preload = |
| 4040 | i == choice_count - 1 ? false : alt_gens.at(i + 1)->expects_preload; |
| 4041 | EmitOutOfLineContinuation(compiler, |
| 4042 | &new_trace, |
| 4043 | alternatives_->at(i), |
| 4044 | alt_gen, |
| 4045 | preload.preload_characters_, |
| 4046 | next_expects_preload); |
| 4047 | } |
| 4048 | } |
| 4049 | |
| 4050 | |
| 4051 | Trace* ChoiceNode::EmitGreedyLoop(RegExpCompiler* compiler, |
| 4052 | Trace* trace, |
| 4053 | AlternativeGenerationList* alt_gens, |
| 4054 | PreloadState* preload, |
| 4055 | GreedyLoopState* greedy_loop_state, |
| 4056 | int text_length) { |
| 4057 | RegExpMacroAssembler* macro_assembler = compiler->macro_assembler(); |
| 4058 | // Here we have special handling for greedy loops containing only text nodes |
| 4059 | // and other simple nodes. These are handled by pushing the current |
| 4060 | // position on the stack and then incrementing the current position each |
| 4061 | // time around the switch. On backtrack we decrement the current position |
| 4062 | // and check it against the pushed value. This avoids pushing backtrack |
| 4063 | // information for each iteration of the loop, which could take up a lot of |
| 4064 | // space. |
| 4065 | DCHECK(trace->stop_node() == NULL); |
| 4066 | macro_assembler->PushCurrentPosition(); |
| 4067 | Label greedy_match_failed; |
| 4068 | Trace greedy_match_trace; |
| 4069 | if (not_at_start()) greedy_match_trace.set_at_start(Trace::FALSE_VALUE); |
| 4070 | greedy_match_trace.set_backtrack(&greedy_match_failed); |
| 4071 | Label loop_label; |
| 4072 | macro_assembler->Bind(&loop_label); |
| 4073 | greedy_match_trace.set_stop_node(this); |
| 4074 | greedy_match_trace.set_loop_label(&loop_label); |
| 4075 | alternatives_->at(0).node()->Emit(compiler, &greedy_match_trace); |
| 4076 | macro_assembler->Bind(&greedy_match_failed); |
| 4077 | |
| 4078 | Label second_choice; // For use in greedy matches. |
| 4079 | macro_assembler->Bind(&second_choice); |
| 4080 | |
| 4081 | Trace* new_trace = greedy_loop_state->counter_backtrack_trace(); |
| 4082 | |
| 4083 | EmitChoices(compiler, |
| 4084 | alt_gens, |
| 4085 | 1, |
| 4086 | new_trace, |
| 4087 | preload); |
| 4088 | |
| 4089 | macro_assembler->Bind(greedy_loop_state->label()); |
| 4090 | // If we have unwound to the bottom then backtrack. |
| 4091 | macro_assembler->CheckGreedyLoop(trace->backtrack()); |
| 4092 | // Otherwise try the second priority at an earlier position. |
| 4093 | macro_assembler->AdvanceCurrentPosition(-text_length); |
| 4094 | macro_assembler->GoTo(&second_choice); |
| 4095 | return new_trace; |
| 4096 | } |
| 4097 | |
| 4098 | int ChoiceNode::EmitOptimizedUnanchoredSearch(RegExpCompiler* compiler, |
| 4099 | Trace* trace) { |
| 4100 | int eats_at_least = PreloadState::kEatsAtLeastNotYetInitialized; |
| 4101 | if (alternatives_->length() != 2) return eats_at_least; |
| 4102 | |
| 4103 | GuardedAlternative alt1 = alternatives_->at(1); |
| 4104 | if (alt1.guards() != NULL && alt1.guards()->length() != 0) { |
| 4105 | return eats_at_least; |
| 4106 | } |
| 4107 | RegExpNode* eats_anything_node = alt1.node(); |
| 4108 | if (eats_anything_node->GetSuccessorOfOmnivorousTextNode(compiler) != this) { |
| 4109 | return eats_at_least; |
| 4110 | } |
| 4111 | |
| 4112 | // Really we should be creating a new trace when we execute this function, |
| 4113 | // but there is no need, because the code it generates cannot backtrack, and |
| 4114 | // we always arrive here with a trivial trace (since it's the entry to a |
| 4115 | // loop. That also implies that there are no preloaded characters, which is |
| 4116 | // good, because it means we won't be violating any assumptions by |
| 4117 | // overwriting those characters with new load instructions. |
| 4118 | DCHECK(trace->is_trivial()); |
| 4119 | |
| 4120 | RegExpMacroAssembler* macro_assembler = compiler->macro_assembler(); |
| 4121 | Isolate* isolate = macro_assembler->isolate(); |
| 4122 | // At this point we know that we are at a non-greedy loop that will eat |
| 4123 | // any character one at a time. Any non-anchored regexp has such a |
| 4124 | // loop prepended to it in order to find where it starts. We look for |
| 4125 | // a pattern of the form ...abc... where we can look 6 characters ahead |
| 4126 | // and step forwards 3 if the character is not one of abc. Abc need |
| 4127 | // not be atoms, they can be any reasonably limited character class or |
| 4128 | // small alternation. |
| 4129 | BoyerMooreLookahead* bm = bm_info(false); |
| 4130 | if (bm == NULL) { |
| 4131 | eats_at_least = Min(kMaxLookaheadForBoyerMoore, |
| 4132 | EatsAtLeast(kMaxLookaheadForBoyerMoore, |
| 4133 | kRecursionBudget, |
| 4134 | false)); |
| 4135 | if (eats_at_least >= 1) { |
| 4136 | bm = new(zone()) BoyerMooreLookahead(eats_at_least, |
| 4137 | compiler, |
| 4138 | zone()); |
| 4139 | GuardedAlternative alt0 = alternatives_->at(0); |
| 4140 | alt0.node()->FillInBMInfo(isolate, 0, kRecursionBudget, bm, false); |
| 4141 | } |
| 4142 | } |
| 4143 | if (bm != NULL) { |
| 4144 | bm->EmitSkipInstructions(macro_assembler); |
| 4145 | } |
| 4146 | return eats_at_least; |
| 4147 | } |
| 4148 | |
| 4149 | |
| 4150 | void ChoiceNode::EmitChoices(RegExpCompiler* compiler, |
| 4151 | AlternativeGenerationList* alt_gens, |
| 4152 | int first_choice, |
| 4153 | Trace* trace, |
| 4154 | PreloadState* preload) { |
| 4155 | RegExpMacroAssembler* macro_assembler = compiler->macro_assembler(); |
| 4156 | SetUpPreLoad(compiler, trace, preload); |
| 4157 | |
| 4158 | // For now we just call all choices one after the other. The idea ultimately |
| 4159 | // is to use the Dispatch table to try only the relevant ones. |
| 4160 | int choice_count = alternatives_->length(); |
| 4161 | |
| 4162 | int new_flush_budget = trace->flush_budget() / choice_count; |
| 4163 | |
| 4164 | for (int i = first_choice; i < choice_count; i++) { |
| 4165 | bool is_last = i == choice_count - 1; |
| 4166 | bool fall_through_on_failure = !is_last; |
| 4167 | GuardedAlternative alternative = alternatives_->at(i); |
| 4168 | AlternativeGeneration* alt_gen = alt_gens->at(i); |
| 4169 | alt_gen->quick_check_details.set_characters(preload->preload_characters_); |
| 4170 | ZoneList<Guard*>* guards = alternative.guards(); |
| 4171 | int guard_count = (guards == NULL) ? 0 : guards->length(); |
| 4172 | Trace new_trace(*trace); |
| 4173 | new_trace.set_characters_preloaded(preload->preload_is_current_ ? |
| 4174 | preload->preload_characters_ : |
| 4175 | 0); |
| 4176 | if (preload->preload_has_checked_bounds_) { |
| 4177 | new_trace.set_bound_checked_up_to(preload->preload_characters_); |
| 4178 | } |
| 4179 | new_trace.quick_check_performed()->Clear(); |
| 4180 | if (not_at_start_) new_trace.set_at_start(Trace::FALSE_VALUE); |
| 4181 | if (!is_last) { |
| 4182 | new_trace.set_backtrack(&alt_gen->after); |
| 4183 | } |
| 4184 | alt_gen->expects_preload = preload->preload_is_current_; |
| 4185 | bool generate_full_check_inline = false; |
| 4186 | if (compiler->optimize() && |
| 4187 | try_to_emit_quick_check_for_alternative(i == 0) && |
| 4188 | alternative.node()->EmitQuickCheck( |
| 4189 | compiler, trace, &new_trace, preload->preload_has_checked_bounds_, |
| 4190 | &alt_gen->possible_success, &alt_gen->quick_check_details, |
| 4191 | fall_through_on_failure)) { |
| 4192 | // Quick check was generated for this choice. |
| 4193 | preload->preload_is_current_ = true; |
| 4194 | preload->preload_has_checked_bounds_ = true; |
| 4195 | // If we generated the quick check to fall through on possible success, |
| 4196 | // we now need to generate the full check inline. |
| 4197 | if (!fall_through_on_failure) { |
| 4198 | macro_assembler->Bind(&alt_gen->possible_success); |
| 4199 | new_trace.set_quick_check_performed(&alt_gen->quick_check_details); |
| 4200 | new_trace.set_characters_preloaded(preload->preload_characters_); |
| 4201 | new_trace.set_bound_checked_up_to(preload->preload_characters_); |
| 4202 | generate_full_check_inline = true; |
| 4203 | } |
| 4204 | } else if (alt_gen->quick_check_details.cannot_match()) { |
| 4205 | if (!fall_through_on_failure) { |
| 4206 | macro_assembler->GoTo(trace->backtrack()); |
| 4207 | } |
| 4208 | continue; |
| 4209 | } else { |
| 4210 | // No quick check was generated. Put the full code here. |
| 4211 | // If this is not the first choice then there could be slow checks from |
| 4212 | // previous cases that go here when they fail. There's no reason to |
| 4213 | // insist that they preload characters since the slow check we are about |
| 4214 | // to generate probably can't use it. |
| 4215 | if (i != first_choice) { |
| 4216 | alt_gen->expects_preload = false; |
| 4217 | new_trace.InvalidateCurrentCharacter(); |
| 4218 | } |
| 4219 | generate_full_check_inline = true; |
| 4220 | } |
| 4221 | if (generate_full_check_inline) { |
| 4222 | if (new_trace.actions() != NULL) { |
| 4223 | new_trace.set_flush_budget(new_flush_budget); |
| 4224 | } |
| 4225 | for (int j = 0; j < guard_count; j++) { |
| 4226 | GenerateGuard(macro_assembler, guards->at(j), &new_trace); |
| 4227 | } |
| 4228 | alternative.node()->Emit(compiler, &new_trace); |
| 4229 | preload->preload_is_current_ = false; |
| 4230 | } |
| 4231 | macro_assembler->Bind(&alt_gen->after); |
| 4232 | } |
| 4233 | } |
| 4234 | |
| 4235 | |
| 4236 | void ChoiceNode::EmitOutOfLineContinuation(RegExpCompiler* compiler, |
| 4237 | Trace* trace, |
| 4238 | GuardedAlternative alternative, |
| 4239 | AlternativeGeneration* alt_gen, |
| 4240 | int preload_characters, |
| 4241 | bool next_expects_preload) { |
| 4242 | if (!alt_gen->possible_success.is_linked()) return; |
| 4243 | |
| 4244 | RegExpMacroAssembler* macro_assembler = compiler->macro_assembler(); |
| 4245 | macro_assembler->Bind(&alt_gen->possible_success); |
| 4246 | Trace out_of_line_trace(*trace); |
| 4247 | out_of_line_trace.set_characters_preloaded(preload_characters); |
| 4248 | out_of_line_trace.set_quick_check_performed(&alt_gen->quick_check_details); |
| 4249 | if (not_at_start_) out_of_line_trace.set_at_start(Trace::FALSE_VALUE); |
| 4250 | ZoneList<Guard*>* guards = alternative.guards(); |
| 4251 | int guard_count = (guards == NULL) ? 0 : guards->length(); |
| 4252 | if (next_expects_preload) { |
| 4253 | Label reload_current_char; |
| 4254 | out_of_line_trace.set_backtrack(&reload_current_char); |
| 4255 | for (int j = 0; j < guard_count; j++) { |
| 4256 | GenerateGuard(macro_assembler, guards->at(j), &out_of_line_trace); |
| 4257 | } |
| 4258 | alternative.node()->Emit(compiler, &out_of_line_trace); |
| 4259 | macro_assembler->Bind(&reload_current_char); |
| 4260 | // Reload the current character, since the next quick check expects that. |
| 4261 | // We don't need to check bounds here because we only get into this |
| 4262 | // code through a quick check which already did the checked load. |
| 4263 | macro_assembler->LoadCurrentCharacter(trace->cp_offset(), |
| 4264 | NULL, |
| 4265 | false, |
| 4266 | preload_characters); |
| 4267 | macro_assembler->GoTo(&(alt_gen->after)); |
| 4268 | } else { |
| 4269 | out_of_line_trace.set_backtrack(&(alt_gen->after)); |
| 4270 | for (int j = 0; j < guard_count; j++) { |
| 4271 | GenerateGuard(macro_assembler, guards->at(j), &out_of_line_trace); |
| 4272 | } |
| 4273 | alternative.node()->Emit(compiler, &out_of_line_trace); |
| 4274 | } |
| 4275 | } |
| 4276 | |
| 4277 | |
| 4278 | void ActionNode::Emit(RegExpCompiler* compiler, Trace* trace) { |
| 4279 | RegExpMacroAssembler* assembler = compiler->macro_assembler(); |
| 4280 | LimitResult limit_result = LimitVersions(compiler, trace); |
| 4281 | if (limit_result == DONE) return; |
| 4282 | DCHECK(limit_result == CONTINUE); |
| 4283 | |
| 4284 | RecursionCheck rc(compiler); |
| 4285 | |
| 4286 | switch (action_type_) { |
| 4287 | case STORE_POSITION: { |
| 4288 | Trace::DeferredCapture |
| 4289 | new_capture(data_.u_position_register.reg, |
| 4290 | data_.u_position_register.is_capture, |
| 4291 | trace); |
| 4292 | Trace new_trace = *trace; |
| 4293 | new_trace.add_action(&new_capture); |
| 4294 | on_success()->Emit(compiler, &new_trace); |
| 4295 | break; |
| 4296 | } |
| 4297 | case INCREMENT_REGISTER: { |
| 4298 | Trace::DeferredIncrementRegister |
| 4299 | new_increment(data_.u_increment_register.reg); |
| 4300 | Trace new_trace = *trace; |
| 4301 | new_trace.add_action(&new_increment); |
| 4302 | on_success()->Emit(compiler, &new_trace); |
| 4303 | break; |
| 4304 | } |
| 4305 | case SET_REGISTER: { |
| 4306 | Trace::DeferredSetRegister |
| 4307 | new_set(data_.u_store_register.reg, data_.u_store_register.value); |
| 4308 | Trace new_trace = *trace; |
| 4309 | new_trace.add_action(&new_set); |
| 4310 | on_success()->Emit(compiler, &new_trace); |
| 4311 | break; |
| 4312 | } |
| 4313 | case CLEAR_CAPTURES: { |
| 4314 | Trace::DeferredClearCaptures |
| 4315 | new_capture(Interval(data_.u_clear_captures.range_from, |
| 4316 | data_.u_clear_captures.range_to)); |
| 4317 | Trace new_trace = *trace; |
| 4318 | new_trace.add_action(&new_capture); |
| 4319 | on_success()->Emit(compiler, &new_trace); |
| 4320 | break; |
| 4321 | } |
| 4322 | case BEGIN_SUBMATCH: |
| 4323 | if (!trace->is_trivial()) { |
| 4324 | trace->Flush(compiler, this); |
| 4325 | } else { |
| 4326 | assembler->WriteCurrentPositionToRegister( |
| 4327 | data_.u_submatch.current_position_register, 0); |
| 4328 | assembler->WriteStackPointerToRegister( |
| 4329 | data_.u_submatch.stack_pointer_register); |
| 4330 | on_success()->Emit(compiler, trace); |
| 4331 | } |
| 4332 | break; |
| 4333 | case EMPTY_MATCH_CHECK: { |
| 4334 | int start_pos_reg = data_.u_empty_match_check.start_register; |
| 4335 | int stored_pos = 0; |
| 4336 | int rep_reg = data_.u_empty_match_check.repetition_register; |
| 4337 | bool has_minimum = (rep_reg != RegExpCompiler::kNoRegister); |
| 4338 | bool know_dist = trace->GetStoredPosition(start_pos_reg, &stored_pos); |
| 4339 | if (know_dist && !has_minimum && stored_pos == trace->cp_offset()) { |
| 4340 | // If we know we haven't advanced and there is no minimum we |
| 4341 | // can just backtrack immediately. |
| 4342 | assembler->GoTo(trace->backtrack()); |
| 4343 | } else if (know_dist && stored_pos < trace->cp_offset()) { |
| 4344 | // If we know we've advanced we can generate the continuation |
| 4345 | // immediately. |
| 4346 | on_success()->Emit(compiler, trace); |
| 4347 | } else if (!trace->is_trivial()) { |
| 4348 | trace->Flush(compiler, this); |
| 4349 | } else { |
| 4350 | Label skip_empty_check; |
| 4351 | // If we have a minimum number of repetitions we check the current |
| 4352 | // number first and skip the empty check if it's not enough. |
| 4353 | if (has_minimum) { |
| 4354 | int limit = data_.u_empty_match_check.repetition_limit; |
| 4355 | assembler->IfRegisterLT(rep_reg, limit, &skip_empty_check); |
| 4356 | } |
| 4357 | // If the match is empty we bail out, otherwise we fall through |
| 4358 | // to the on-success continuation. |
| 4359 | assembler->IfRegisterEqPos(data_.u_empty_match_check.start_register, |
| 4360 | trace->backtrack()); |
| 4361 | assembler->Bind(&skip_empty_check); |
| 4362 | on_success()->Emit(compiler, trace); |
| 4363 | } |
| 4364 | break; |
| 4365 | } |
| 4366 | case POSITIVE_SUBMATCH_SUCCESS: { |
| 4367 | if (!trace->is_trivial()) { |
| 4368 | trace->Flush(compiler, this); |
| 4369 | return; |
| 4370 | } |
| 4371 | assembler->ReadCurrentPositionFromRegister( |
| 4372 | data_.u_submatch.current_position_register); |
| 4373 | assembler->ReadStackPointerFromRegister( |
| 4374 | data_.u_submatch.stack_pointer_register); |
| 4375 | int clear_register_count = data_.u_submatch.clear_register_count; |
| 4376 | if (clear_register_count == 0) { |
| 4377 | on_success()->Emit(compiler, trace); |
| 4378 | return; |
| 4379 | } |
| 4380 | int clear_registers_from = data_.u_submatch.clear_register_from; |
| 4381 | Label clear_registers_backtrack; |
| 4382 | Trace new_trace = *trace; |
| 4383 | new_trace.set_backtrack(&clear_registers_backtrack); |
| 4384 | on_success()->Emit(compiler, &new_trace); |
| 4385 | |
| 4386 | assembler->Bind(&clear_registers_backtrack); |
| 4387 | int clear_registers_to = clear_registers_from + clear_register_count - 1; |
| 4388 | assembler->ClearRegisters(clear_registers_from, clear_registers_to); |
| 4389 | |
| 4390 | DCHECK(trace->backtrack() == NULL); |
| 4391 | assembler->Backtrack(); |
| 4392 | return; |
| 4393 | } |
| 4394 | default: |
| 4395 | UNREACHABLE(); |
| 4396 | } |
| 4397 | } |
| 4398 | |
| 4399 | |
| 4400 | void BackReferenceNode::Emit(RegExpCompiler* compiler, Trace* trace) { |
| 4401 | RegExpMacroAssembler* assembler = compiler->macro_assembler(); |
| 4402 | if (!trace->is_trivial()) { |
| 4403 | trace->Flush(compiler, this); |
| 4404 | return; |
| 4405 | } |
| 4406 | |
| 4407 | LimitResult limit_result = LimitVersions(compiler, trace); |
| 4408 | if (limit_result == DONE) return; |
| 4409 | DCHECK(limit_result == CONTINUE); |
| 4410 | |
| 4411 | RecursionCheck rc(compiler); |
| 4412 | |
| 4413 | DCHECK_EQ(start_reg_ + 1, end_reg_); |
| 4414 | if (compiler->ignore_case()) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 4415 | assembler->CheckNotBackReferenceIgnoreCase( |
| 4416 | start_reg_, read_backward(), compiler->unicode(), trace->backtrack()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 4417 | } else { |
| 4418 | assembler->CheckNotBackReference(start_reg_, read_backward(), |
| 4419 | trace->backtrack()); |
| 4420 | } |
| 4421 | // We are going to advance backward, so we may end up at the start. |
| 4422 | if (read_backward()) trace->set_at_start(Trace::UNKNOWN); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 4423 | |
| 4424 | // Check that the back reference does not end inside a surrogate pair. |
| 4425 | if (compiler->unicode() && !compiler->one_byte()) { |
| 4426 | assembler->CheckNotInSurrogatePair(trace->cp_offset(), trace->backtrack()); |
| 4427 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 4428 | on_success()->Emit(compiler, trace); |
| 4429 | } |
| 4430 | |
| 4431 | |
| 4432 | // ------------------------------------------------------------------- |
| 4433 | // Dot/dotty output |
| 4434 | |
| 4435 | |
| 4436 | #ifdef DEBUG |
| 4437 | |
| 4438 | |
| 4439 | class DotPrinter: public NodeVisitor { |
| 4440 | public: |
| 4441 | DotPrinter(std::ostream& os, bool ignore_case) // NOLINT |
| 4442 | : os_(os), |
| 4443 | ignore_case_(ignore_case) {} |
| 4444 | void PrintNode(const char* label, RegExpNode* node); |
| 4445 | void Visit(RegExpNode* node); |
| 4446 | void PrintAttributes(RegExpNode* from); |
| 4447 | void PrintOnFailure(RegExpNode* from, RegExpNode* to); |
| 4448 | #define DECLARE_VISIT(Type) \ |
| 4449 | virtual void Visit##Type(Type##Node* that); |
| 4450 | FOR_EACH_NODE_TYPE(DECLARE_VISIT) |
| 4451 | #undef DECLARE_VISIT |
| 4452 | private: |
| 4453 | std::ostream& os_; |
| 4454 | bool ignore_case_; |
| 4455 | }; |
| 4456 | |
| 4457 | |
| 4458 | void DotPrinter::PrintNode(const char* label, RegExpNode* node) { |
| 4459 | os_ << "digraph G {\n graph [label=\""; |
| 4460 | for (int i = 0; label[i]; i++) { |
| 4461 | switch (label[i]) { |
| 4462 | case '\\': |
| 4463 | os_ << "\\\\"; |
| 4464 | break; |
| 4465 | case '"': |
| 4466 | os_ << "\""; |
| 4467 | break; |
| 4468 | default: |
| 4469 | os_ << label[i]; |
| 4470 | break; |
| 4471 | } |
| 4472 | } |
| 4473 | os_ << "\"];\n"; |
| 4474 | Visit(node); |
| 4475 | os_ << "}" << std::endl; |
| 4476 | } |
| 4477 | |
| 4478 | |
| 4479 | void DotPrinter::Visit(RegExpNode* node) { |
| 4480 | if (node->info()->visited) return; |
| 4481 | node->info()->visited = true; |
| 4482 | node->Accept(this); |
| 4483 | } |
| 4484 | |
| 4485 | |
| 4486 | void DotPrinter::PrintOnFailure(RegExpNode* from, RegExpNode* on_failure) { |
| 4487 | os_ << " n" << from << " -> n" << on_failure << " [style=dotted];\n"; |
| 4488 | Visit(on_failure); |
| 4489 | } |
| 4490 | |
| 4491 | |
| 4492 | class TableEntryBodyPrinter { |
| 4493 | public: |
| 4494 | TableEntryBodyPrinter(std::ostream& os, ChoiceNode* choice) // NOLINT |
| 4495 | : os_(os), |
| 4496 | choice_(choice) {} |
| 4497 | void Call(uc16 from, DispatchTable::Entry entry) { |
| 4498 | OutSet* out_set = entry.out_set(); |
| 4499 | for (unsigned i = 0; i < OutSet::kFirstLimit; i++) { |
| 4500 | if (out_set->Get(i)) { |
| 4501 | os_ << " n" << choice() << ":s" << from << "o" << i << " -> n" |
| 4502 | << choice()->alternatives()->at(i).node() << ";\n"; |
| 4503 | } |
| 4504 | } |
| 4505 | } |
| 4506 | private: |
| 4507 | ChoiceNode* choice() { return choice_; } |
| 4508 | std::ostream& os_; |
| 4509 | ChoiceNode* choice_; |
| 4510 | }; |
| 4511 | |
| 4512 | |
| 4513 | class TableEntryHeaderPrinter { |
| 4514 | public: |
| 4515 | explicit TableEntryHeaderPrinter(std::ostream& os) // NOLINT |
| 4516 | : first_(true), |
| 4517 | os_(os) {} |
| 4518 | void Call(uc16 from, DispatchTable::Entry entry) { |
| 4519 | if (first_) { |
| 4520 | first_ = false; |
| 4521 | } else { |
| 4522 | os_ << "|"; |
| 4523 | } |
| 4524 | os_ << "{\\" << AsUC16(from) << "-\\" << AsUC16(entry.to()) << "|{"; |
| 4525 | OutSet* out_set = entry.out_set(); |
| 4526 | int priority = 0; |
| 4527 | for (unsigned i = 0; i < OutSet::kFirstLimit; i++) { |
| 4528 | if (out_set->Get(i)) { |
| 4529 | if (priority > 0) os_ << "|"; |
| 4530 | os_ << "<s" << from << "o" << i << "> " << priority; |
| 4531 | priority++; |
| 4532 | } |
| 4533 | } |
| 4534 | os_ << "}}"; |
| 4535 | } |
| 4536 | |
| 4537 | private: |
| 4538 | bool first_; |
| 4539 | std::ostream& os_; |
| 4540 | }; |
| 4541 | |
| 4542 | |
| 4543 | class AttributePrinter { |
| 4544 | public: |
| 4545 | explicit AttributePrinter(std::ostream& os) // NOLINT |
| 4546 | : os_(os), |
| 4547 | first_(true) {} |
| 4548 | void PrintSeparator() { |
| 4549 | if (first_) { |
| 4550 | first_ = false; |
| 4551 | } else { |
| 4552 | os_ << "|"; |
| 4553 | } |
| 4554 | } |
| 4555 | void PrintBit(const char* name, bool value) { |
| 4556 | if (!value) return; |
| 4557 | PrintSeparator(); |
| 4558 | os_ << "{" << name << "}"; |
| 4559 | } |
| 4560 | void PrintPositive(const char* name, int value) { |
| 4561 | if (value < 0) return; |
| 4562 | PrintSeparator(); |
| 4563 | os_ << "{" << name << "|" << value << "}"; |
| 4564 | } |
| 4565 | |
| 4566 | private: |
| 4567 | std::ostream& os_; |
| 4568 | bool first_; |
| 4569 | }; |
| 4570 | |
| 4571 | |
| 4572 | void DotPrinter::PrintAttributes(RegExpNode* that) { |
| 4573 | os_ << " a" << that << " [shape=Mrecord, color=grey, fontcolor=grey, " |
| 4574 | << "margin=0.1, fontsize=10, label=\"{"; |
| 4575 | AttributePrinter printer(os_); |
| 4576 | NodeInfo* info = that->info(); |
| 4577 | printer.PrintBit("NI", info->follows_newline_interest); |
| 4578 | printer.PrintBit("WI", info->follows_word_interest); |
| 4579 | printer.PrintBit("SI", info->follows_start_interest); |
| 4580 | Label* label = that->label(); |
| 4581 | if (label->is_bound()) |
| 4582 | printer.PrintPositive("@", label->pos()); |
| 4583 | os_ << "}\"];\n" |
| 4584 | << " a" << that << " -> n" << that |
| 4585 | << " [style=dashed, color=grey, arrowhead=none];\n"; |
| 4586 | } |
| 4587 | |
| 4588 | |
| 4589 | static const bool kPrintDispatchTable = false; |
| 4590 | void DotPrinter::VisitChoice(ChoiceNode* that) { |
| 4591 | if (kPrintDispatchTable) { |
| 4592 | os_ << " n" << that << " [shape=Mrecord, label=\""; |
| 4593 | TableEntryHeaderPrinter header_printer(os_); |
| 4594 | that->GetTable(ignore_case_)->ForEach(&header_printer); |
| 4595 | os_ << "\"]\n"; |
| 4596 | PrintAttributes(that); |
| 4597 | TableEntryBodyPrinter body_printer(os_, that); |
| 4598 | that->GetTable(ignore_case_)->ForEach(&body_printer); |
| 4599 | } else { |
| 4600 | os_ << " n" << that << " [shape=Mrecord, label=\"?\"];\n"; |
| 4601 | for (int i = 0; i < that->alternatives()->length(); i++) { |
| 4602 | GuardedAlternative alt = that->alternatives()->at(i); |
| 4603 | os_ << " n" << that << " -> n" << alt.node(); |
| 4604 | } |
| 4605 | } |
| 4606 | for (int i = 0; i < that->alternatives()->length(); i++) { |
| 4607 | GuardedAlternative alt = that->alternatives()->at(i); |
| 4608 | alt.node()->Accept(this); |
| 4609 | } |
| 4610 | } |
| 4611 | |
| 4612 | |
| 4613 | void DotPrinter::VisitText(TextNode* that) { |
| 4614 | Zone* zone = that->zone(); |
| 4615 | os_ << " n" << that << " [label=\""; |
| 4616 | for (int i = 0; i < that->elements()->length(); i++) { |
| 4617 | if (i > 0) os_ << " "; |
| 4618 | TextElement elm = that->elements()->at(i); |
| 4619 | switch (elm.text_type()) { |
| 4620 | case TextElement::ATOM: { |
| 4621 | Vector<const uc16> data = elm.atom()->data(); |
| 4622 | for (int i = 0; i < data.length(); i++) { |
| 4623 | os_ << static_cast<char>(data[i]); |
| 4624 | } |
| 4625 | break; |
| 4626 | } |
| 4627 | case TextElement::CHAR_CLASS: { |
| 4628 | RegExpCharacterClass* node = elm.char_class(); |
| 4629 | os_ << "["; |
| 4630 | if (node->is_negated()) os_ << "^"; |
| 4631 | for (int j = 0; j < node->ranges(zone)->length(); j++) { |
| 4632 | CharacterRange range = node->ranges(zone)->at(j); |
| 4633 | os_ << AsUC16(range.from()) << "-" << AsUC16(range.to()); |
| 4634 | } |
| 4635 | os_ << "]"; |
| 4636 | break; |
| 4637 | } |
| 4638 | default: |
| 4639 | UNREACHABLE(); |
| 4640 | } |
| 4641 | } |
| 4642 | os_ << "\", shape=box, peripheries=2];\n"; |
| 4643 | PrintAttributes(that); |
| 4644 | os_ << " n" << that << " -> n" << that->on_success() << ";\n"; |
| 4645 | Visit(that->on_success()); |
| 4646 | } |
| 4647 | |
| 4648 | |
| 4649 | void DotPrinter::VisitBackReference(BackReferenceNode* that) { |
| 4650 | os_ << " n" << that << " [label=\"$" << that->start_register() << "..$" |
| 4651 | << that->end_register() << "\", shape=doubleoctagon];\n"; |
| 4652 | PrintAttributes(that); |
| 4653 | os_ << " n" << that << " -> n" << that->on_success() << ";\n"; |
| 4654 | Visit(that->on_success()); |
| 4655 | } |
| 4656 | |
| 4657 | |
| 4658 | void DotPrinter::VisitEnd(EndNode* that) { |
| 4659 | os_ << " n" << that << " [style=bold, shape=point];\n"; |
| 4660 | PrintAttributes(that); |
| 4661 | } |
| 4662 | |
| 4663 | |
| 4664 | void DotPrinter::VisitAssertion(AssertionNode* that) { |
| 4665 | os_ << " n" << that << " ["; |
| 4666 | switch (that->assertion_type()) { |
| 4667 | case AssertionNode::AT_END: |
| 4668 | os_ << "label=\"$\", shape=septagon"; |
| 4669 | break; |
| 4670 | case AssertionNode::AT_START: |
| 4671 | os_ << "label=\"^\", shape=septagon"; |
| 4672 | break; |
| 4673 | case AssertionNode::AT_BOUNDARY: |
| 4674 | os_ << "label=\"\\b\", shape=septagon"; |
| 4675 | break; |
| 4676 | case AssertionNode::AT_NON_BOUNDARY: |
| 4677 | os_ << "label=\"\\B\", shape=septagon"; |
| 4678 | break; |
| 4679 | case AssertionNode::AFTER_NEWLINE: |
| 4680 | os_ << "label=\"(?<=\\n)\", shape=septagon"; |
| 4681 | break; |
| 4682 | } |
| 4683 | os_ << "];\n"; |
| 4684 | PrintAttributes(that); |
| 4685 | RegExpNode* successor = that->on_success(); |
| 4686 | os_ << " n" << that << " -> n" << successor << ";\n"; |
| 4687 | Visit(successor); |
| 4688 | } |
| 4689 | |
| 4690 | |
| 4691 | void DotPrinter::VisitAction(ActionNode* that) { |
| 4692 | os_ << " n" << that << " ["; |
| 4693 | switch (that->action_type_) { |
| 4694 | case ActionNode::SET_REGISTER: |
| 4695 | os_ << "label=\"$" << that->data_.u_store_register.reg |
| 4696 | << ":=" << that->data_.u_store_register.value << "\", shape=octagon"; |
| 4697 | break; |
| 4698 | case ActionNode::INCREMENT_REGISTER: |
| 4699 | os_ << "label=\"$" << that->data_.u_increment_register.reg |
| 4700 | << "++\", shape=octagon"; |
| 4701 | break; |
| 4702 | case ActionNode::STORE_POSITION: |
| 4703 | os_ << "label=\"$" << that->data_.u_position_register.reg |
| 4704 | << ":=$pos\", shape=octagon"; |
| 4705 | break; |
| 4706 | case ActionNode::BEGIN_SUBMATCH: |
| 4707 | os_ << "label=\"$" << that->data_.u_submatch.current_position_register |
| 4708 | << ":=$pos,begin\", shape=septagon"; |
| 4709 | break; |
| 4710 | case ActionNode::POSITIVE_SUBMATCH_SUCCESS: |
| 4711 | os_ << "label=\"escape\", shape=septagon"; |
| 4712 | break; |
| 4713 | case ActionNode::EMPTY_MATCH_CHECK: |
| 4714 | os_ << "label=\"$" << that->data_.u_empty_match_check.start_register |
| 4715 | << "=$pos?,$" << that->data_.u_empty_match_check.repetition_register |
| 4716 | << "<" << that->data_.u_empty_match_check.repetition_limit |
| 4717 | << "?\", shape=septagon"; |
| 4718 | break; |
| 4719 | case ActionNode::CLEAR_CAPTURES: { |
| 4720 | os_ << "label=\"clear $" << that->data_.u_clear_captures.range_from |
| 4721 | << " to $" << that->data_.u_clear_captures.range_to |
| 4722 | << "\", shape=septagon"; |
| 4723 | break; |
| 4724 | } |
| 4725 | } |
| 4726 | os_ << "];\n"; |
| 4727 | PrintAttributes(that); |
| 4728 | RegExpNode* successor = that->on_success(); |
| 4729 | os_ << " n" << that << " -> n" << successor << ";\n"; |
| 4730 | Visit(successor); |
| 4731 | } |
| 4732 | |
| 4733 | |
| 4734 | class DispatchTableDumper { |
| 4735 | public: |
| 4736 | explicit DispatchTableDumper(std::ostream& os) : os_(os) {} |
| 4737 | void Call(uc16 key, DispatchTable::Entry entry); |
| 4738 | private: |
| 4739 | std::ostream& os_; |
| 4740 | }; |
| 4741 | |
| 4742 | |
| 4743 | void DispatchTableDumper::Call(uc16 key, DispatchTable::Entry entry) { |
| 4744 | os_ << "[" << AsUC16(key) << "-" << AsUC16(entry.to()) << "]: {"; |
| 4745 | OutSet* set = entry.out_set(); |
| 4746 | bool first = true; |
| 4747 | for (unsigned i = 0; i < OutSet::kFirstLimit; i++) { |
| 4748 | if (set->Get(i)) { |
| 4749 | if (first) { |
| 4750 | first = false; |
| 4751 | } else { |
| 4752 | os_ << ", "; |
| 4753 | } |
| 4754 | os_ << i; |
| 4755 | } |
| 4756 | } |
| 4757 | os_ << "}\n"; |
| 4758 | } |
| 4759 | |
| 4760 | |
| 4761 | void DispatchTable::Dump() { |
| 4762 | OFStream os(stderr); |
| 4763 | DispatchTableDumper dumper(os); |
| 4764 | tree()->ForEach(&dumper); |
| 4765 | } |
| 4766 | |
| 4767 | |
| 4768 | void RegExpEngine::DotPrint(const char* label, |
| 4769 | RegExpNode* node, |
| 4770 | bool ignore_case) { |
| 4771 | OFStream os(stdout); |
| 4772 | DotPrinter printer(os, ignore_case); |
| 4773 | printer.PrintNode(label, node); |
| 4774 | } |
| 4775 | |
| 4776 | |
| 4777 | #endif // DEBUG |
| 4778 | |
| 4779 | |
| 4780 | // ------------------------------------------------------------------- |
| 4781 | // Tree to graph conversion |
| 4782 | |
| 4783 | RegExpNode* RegExpAtom::ToNode(RegExpCompiler* compiler, |
| 4784 | RegExpNode* on_success) { |
| 4785 | ZoneList<TextElement>* elms = |
| 4786 | new(compiler->zone()) ZoneList<TextElement>(1, compiler->zone()); |
| 4787 | elms->Add(TextElement::Atom(this), compiler->zone()); |
| 4788 | return new (compiler->zone()) |
| 4789 | TextNode(elms, compiler->read_backward(), on_success); |
| 4790 | } |
| 4791 | |
| 4792 | |
| 4793 | RegExpNode* RegExpText::ToNode(RegExpCompiler* compiler, |
| 4794 | RegExpNode* on_success) { |
| 4795 | return new (compiler->zone()) |
| 4796 | TextNode(elements(), compiler->read_backward(), on_success); |
| 4797 | } |
| 4798 | |
| 4799 | |
| 4800 | static bool CompareInverseRanges(ZoneList<CharacterRange>* ranges, |
| 4801 | const int* special_class, |
| 4802 | int length) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 4803 | length--; // Remove final marker. |
| 4804 | DCHECK(special_class[length] == kRangeEndMarker); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 4805 | DCHECK(ranges->length() != 0); |
| 4806 | DCHECK(length != 0); |
| 4807 | DCHECK(special_class[0] != 0); |
| 4808 | if (ranges->length() != (length >> 1) + 1) { |
| 4809 | return false; |
| 4810 | } |
| 4811 | CharacterRange range = ranges->at(0); |
| 4812 | if (range.from() != 0) { |
| 4813 | return false; |
| 4814 | } |
| 4815 | for (int i = 0; i < length; i += 2) { |
| 4816 | if (special_class[i] != (range.to() + 1)) { |
| 4817 | return false; |
| 4818 | } |
| 4819 | range = ranges->at((i >> 1) + 1); |
| 4820 | if (special_class[i+1] != range.from()) { |
| 4821 | return false; |
| 4822 | } |
| 4823 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 4824 | if (range.to() != String::kMaxCodePoint) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 4825 | return false; |
| 4826 | } |
| 4827 | return true; |
| 4828 | } |
| 4829 | |
| 4830 | |
| 4831 | static bool CompareRanges(ZoneList<CharacterRange>* ranges, |
| 4832 | const int* special_class, |
| 4833 | int length) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 4834 | length--; // Remove final marker. |
| 4835 | DCHECK(special_class[length] == kRangeEndMarker); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 4836 | if (ranges->length() * 2 != length) { |
| 4837 | return false; |
| 4838 | } |
| 4839 | for (int i = 0; i < length; i += 2) { |
| 4840 | CharacterRange range = ranges->at(i >> 1); |
| 4841 | if (range.from() != special_class[i] || |
| 4842 | range.to() != special_class[i + 1] - 1) { |
| 4843 | return false; |
| 4844 | } |
| 4845 | } |
| 4846 | return true; |
| 4847 | } |
| 4848 | |
| 4849 | |
| 4850 | bool RegExpCharacterClass::is_standard(Zone* zone) { |
| 4851 | // TODO(lrn): Remove need for this function, by not throwing away information |
| 4852 | // along the way. |
| 4853 | if (is_negated_) { |
| 4854 | return false; |
| 4855 | } |
| 4856 | if (set_.is_standard()) { |
| 4857 | return true; |
| 4858 | } |
| 4859 | if (CompareRanges(set_.ranges(zone), kSpaceRanges, kSpaceRangeCount)) { |
| 4860 | set_.set_standard_set_type('s'); |
| 4861 | return true; |
| 4862 | } |
| 4863 | if (CompareInverseRanges(set_.ranges(zone), kSpaceRanges, kSpaceRangeCount)) { |
| 4864 | set_.set_standard_set_type('S'); |
| 4865 | return true; |
| 4866 | } |
| 4867 | if (CompareInverseRanges(set_.ranges(zone), |
| 4868 | kLineTerminatorRanges, |
| 4869 | kLineTerminatorRangeCount)) { |
| 4870 | set_.set_standard_set_type('.'); |
| 4871 | return true; |
| 4872 | } |
| 4873 | if (CompareRanges(set_.ranges(zone), |
| 4874 | kLineTerminatorRanges, |
| 4875 | kLineTerminatorRangeCount)) { |
| 4876 | set_.set_standard_set_type('n'); |
| 4877 | return true; |
| 4878 | } |
| 4879 | if (CompareRanges(set_.ranges(zone), kWordRanges, kWordRangeCount)) { |
| 4880 | set_.set_standard_set_type('w'); |
| 4881 | return true; |
| 4882 | } |
| 4883 | if (CompareInverseRanges(set_.ranges(zone), kWordRanges, kWordRangeCount)) { |
| 4884 | set_.set_standard_set_type('W'); |
| 4885 | return true; |
| 4886 | } |
| 4887 | return false; |
| 4888 | } |
| 4889 | |
| 4890 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 4891 | UnicodeRangeSplitter::UnicodeRangeSplitter(Zone* zone, |
| 4892 | ZoneList<CharacterRange>* base) |
| 4893 | : zone_(zone), |
| 4894 | table_(zone), |
| 4895 | bmp_(nullptr), |
| 4896 | lead_surrogates_(nullptr), |
| 4897 | trail_surrogates_(nullptr), |
| 4898 | non_bmp_(nullptr) { |
| 4899 | // The unicode range splitter categorizes given character ranges into: |
| 4900 | // - Code points from the BMP representable by one code unit. |
| 4901 | // - Code points outside the BMP that need to be split into surrogate pairs. |
| 4902 | // - Lone lead surrogates. |
| 4903 | // - Lone trail surrogates. |
| 4904 | // Lone surrogates are valid code points, even though no actual characters. |
| 4905 | // They require special matching to make sure we do not split surrogate pairs. |
| 4906 | // We use the dispatch table to accomplish this. The base range is split up |
| 4907 | // by the table by the overlay ranges, and the Call callback is used to |
| 4908 | // filter and collect ranges for each category. |
| 4909 | for (int i = 0; i < base->length(); i++) { |
| 4910 | table_.AddRange(base->at(i), kBase, zone_); |
| 4911 | } |
| 4912 | // Add overlay ranges. |
| 4913 | table_.AddRange(CharacterRange::Range(0, kLeadSurrogateStart - 1), |
| 4914 | kBmpCodePoints, zone_); |
| 4915 | table_.AddRange(CharacterRange::Range(kLeadSurrogateStart, kLeadSurrogateEnd), |
| 4916 | kLeadSurrogates, zone_); |
| 4917 | table_.AddRange( |
| 4918 | CharacterRange::Range(kTrailSurrogateStart, kTrailSurrogateEnd), |
| 4919 | kTrailSurrogates, zone_); |
| 4920 | table_.AddRange( |
| 4921 | CharacterRange::Range(kTrailSurrogateEnd + 1, kNonBmpStart - 1), |
| 4922 | kBmpCodePoints, zone_); |
| 4923 | table_.AddRange(CharacterRange::Range(kNonBmpStart, kNonBmpEnd), |
| 4924 | kNonBmpCodePoints, zone_); |
| 4925 | table_.ForEach(this); |
| 4926 | } |
| 4927 | |
| 4928 | |
| 4929 | void UnicodeRangeSplitter::Call(uc32 from, DispatchTable::Entry entry) { |
| 4930 | OutSet* outset = entry.out_set(); |
| 4931 | if (!outset->Get(kBase)) return; |
| 4932 | ZoneList<CharacterRange>** target = NULL; |
| 4933 | if (outset->Get(kBmpCodePoints)) { |
| 4934 | target = &bmp_; |
| 4935 | } else if (outset->Get(kLeadSurrogates)) { |
| 4936 | target = &lead_surrogates_; |
| 4937 | } else if (outset->Get(kTrailSurrogates)) { |
| 4938 | target = &trail_surrogates_; |
| 4939 | } else { |
| 4940 | DCHECK(outset->Get(kNonBmpCodePoints)); |
| 4941 | target = &non_bmp_; |
| 4942 | } |
| 4943 | if (*target == NULL) *target = new (zone_) ZoneList<CharacterRange>(2, zone_); |
| 4944 | (*target)->Add(CharacterRange::Range(entry.from(), entry.to()), zone_); |
| 4945 | } |
| 4946 | |
| 4947 | |
| 4948 | void AddBmpCharacters(RegExpCompiler* compiler, ChoiceNode* result, |
| 4949 | RegExpNode* on_success, UnicodeRangeSplitter* splitter) { |
| 4950 | ZoneList<CharacterRange>* bmp = splitter->bmp(); |
| 4951 | if (bmp == nullptr) return; |
| 4952 | result->AddAlternative(GuardedAlternative(TextNode::CreateForCharacterRanges( |
| 4953 | compiler->zone(), bmp, compiler->read_backward(), on_success))); |
| 4954 | } |
| 4955 | |
| 4956 | |
| 4957 | void AddNonBmpSurrogatePairs(RegExpCompiler* compiler, ChoiceNode* result, |
| 4958 | RegExpNode* on_success, |
| 4959 | UnicodeRangeSplitter* splitter) { |
| 4960 | ZoneList<CharacterRange>* non_bmp = splitter->non_bmp(); |
| 4961 | if (non_bmp == nullptr) return; |
| 4962 | DCHECK(compiler->unicode()); |
| 4963 | DCHECK(!compiler->one_byte()); |
| 4964 | Zone* zone = compiler->zone(); |
| 4965 | CharacterRange::Canonicalize(non_bmp); |
| 4966 | for (int i = 0; i < non_bmp->length(); i++) { |
| 4967 | // Match surrogate pair. |
| 4968 | // E.g. [\u10005-\u11005] becomes |
| 4969 | // \ud800[\udc05-\udfff]| |
| 4970 | // [\ud801-\ud803][\udc00-\udfff]| |
| 4971 | // \ud804[\udc00-\udc05] |
| 4972 | uc32 from = non_bmp->at(i).from(); |
| 4973 | uc32 to = non_bmp->at(i).to(); |
| 4974 | uc16 from_l = unibrow::Utf16::LeadSurrogate(from); |
| 4975 | uc16 from_t = unibrow::Utf16::TrailSurrogate(from); |
| 4976 | uc16 to_l = unibrow::Utf16::LeadSurrogate(to); |
| 4977 | uc16 to_t = unibrow::Utf16::TrailSurrogate(to); |
| 4978 | if (from_l == to_l) { |
| 4979 | // The lead surrogate is the same. |
| 4980 | result->AddAlternative( |
| 4981 | GuardedAlternative(TextNode::CreateForSurrogatePair( |
| 4982 | zone, CharacterRange::Singleton(from_l), |
| 4983 | CharacterRange::Range(from_t, to_t), compiler->read_backward(), |
| 4984 | on_success))); |
| 4985 | } else { |
| 4986 | if (from_t != kTrailSurrogateStart) { |
| 4987 | // Add [from_l][from_t-\udfff] |
| 4988 | result->AddAlternative( |
| 4989 | GuardedAlternative(TextNode::CreateForSurrogatePair( |
| 4990 | zone, CharacterRange::Singleton(from_l), |
| 4991 | CharacterRange::Range(from_t, kTrailSurrogateEnd), |
| 4992 | compiler->read_backward(), on_success))); |
| 4993 | from_l++; |
| 4994 | } |
| 4995 | if (to_t != kTrailSurrogateEnd) { |
| 4996 | // Add [to_l][\udc00-to_t] |
| 4997 | result->AddAlternative( |
| 4998 | GuardedAlternative(TextNode::CreateForSurrogatePair( |
| 4999 | zone, CharacterRange::Singleton(to_l), |
| 5000 | CharacterRange::Range(kTrailSurrogateStart, to_t), |
| 5001 | compiler->read_backward(), on_success))); |
| 5002 | to_l--; |
| 5003 | } |
| 5004 | if (from_l <= to_l) { |
| 5005 | // Add [from_l-to_l][\udc00-\udfff] |
| 5006 | result->AddAlternative( |
| 5007 | GuardedAlternative(TextNode::CreateForSurrogatePair( |
| 5008 | zone, CharacterRange::Range(from_l, to_l), |
| 5009 | CharacterRange::Range(kTrailSurrogateStart, kTrailSurrogateEnd), |
| 5010 | compiler->read_backward(), on_success))); |
| 5011 | } |
| 5012 | } |
| 5013 | } |
| 5014 | } |
| 5015 | |
| 5016 | |
| 5017 | RegExpNode* NegativeLookaroundAgainstReadDirectionAndMatch( |
| 5018 | RegExpCompiler* compiler, ZoneList<CharacterRange>* lookbehind, |
| 5019 | ZoneList<CharacterRange>* match, RegExpNode* on_success, |
| 5020 | bool read_backward) { |
| 5021 | Zone* zone = compiler->zone(); |
| 5022 | RegExpNode* match_node = TextNode::CreateForCharacterRanges( |
| 5023 | zone, match, read_backward, on_success); |
| 5024 | int stack_register = compiler->UnicodeLookaroundStackRegister(); |
| 5025 | int position_register = compiler->UnicodeLookaroundPositionRegister(); |
| 5026 | RegExpLookaround::Builder lookaround(false, match_node, stack_register, |
| 5027 | position_register); |
| 5028 | RegExpNode* negative_match = TextNode::CreateForCharacterRanges( |
| 5029 | zone, lookbehind, !read_backward, lookaround.on_match_success()); |
| 5030 | return lookaround.ForMatch(negative_match); |
| 5031 | } |
| 5032 | |
| 5033 | |
| 5034 | RegExpNode* MatchAndNegativeLookaroundInReadDirection( |
| 5035 | RegExpCompiler* compiler, ZoneList<CharacterRange>* match, |
| 5036 | ZoneList<CharacterRange>* lookahead, RegExpNode* on_success, |
| 5037 | bool read_backward) { |
| 5038 | Zone* zone = compiler->zone(); |
| 5039 | int stack_register = compiler->UnicodeLookaroundStackRegister(); |
| 5040 | int position_register = compiler->UnicodeLookaroundPositionRegister(); |
| 5041 | RegExpLookaround::Builder lookaround(false, on_success, stack_register, |
| 5042 | position_register); |
| 5043 | RegExpNode* negative_match = TextNode::CreateForCharacterRanges( |
| 5044 | zone, lookahead, read_backward, lookaround.on_match_success()); |
| 5045 | return TextNode::CreateForCharacterRanges( |
| 5046 | zone, match, read_backward, lookaround.ForMatch(negative_match)); |
| 5047 | } |
| 5048 | |
| 5049 | |
| 5050 | void AddLoneLeadSurrogates(RegExpCompiler* compiler, ChoiceNode* result, |
| 5051 | RegExpNode* on_success, |
| 5052 | UnicodeRangeSplitter* splitter) { |
| 5053 | ZoneList<CharacterRange>* lead_surrogates = splitter->lead_surrogates(); |
| 5054 | if (lead_surrogates == nullptr) return; |
| 5055 | Zone* zone = compiler->zone(); |
| 5056 | // E.g. \ud801 becomes \ud801(?![\udc00-\udfff]). |
| 5057 | ZoneList<CharacterRange>* trail_surrogates = CharacterRange::List( |
| 5058 | zone, CharacterRange::Range(kTrailSurrogateStart, kTrailSurrogateEnd)); |
| 5059 | |
| 5060 | RegExpNode* match; |
| 5061 | if (compiler->read_backward()) { |
| 5062 | // Reading backward. Assert that reading forward, there is no trail |
| 5063 | // surrogate, and then backward match the lead surrogate. |
| 5064 | match = NegativeLookaroundAgainstReadDirectionAndMatch( |
| 5065 | compiler, trail_surrogates, lead_surrogates, on_success, true); |
| 5066 | } else { |
| 5067 | // Reading forward. Forward match the lead surrogate and assert that |
| 5068 | // no trail surrogate follows. |
| 5069 | match = MatchAndNegativeLookaroundInReadDirection( |
| 5070 | compiler, lead_surrogates, trail_surrogates, on_success, false); |
| 5071 | } |
| 5072 | result->AddAlternative(GuardedAlternative(match)); |
| 5073 | } |
| 5074 | |
| 5075 | |
| 5076 | void AddLoneTrailSurrogates(RegExpCompiler* compiler, ChoiceNode* result, |
| 5077 | RegExpNode* on_success, |
| 5078 | UnicodeRangeSplitter* splitter) { |
| 5079 | ZoneList<CharacterRange>* trail_surrogates = splitter->trail_surrogates(); |
| 5080 | if (trail_surrogates == nullptr) return; |
| 5081 | Zone* zone = compiler->zone(); |
| 5082 | // E.g. \udc01 becomes (?<![\ud800-\udbff])\udc01 |
| 5083 | ZoneList<CharacterRange>* lead_surrogates = CharacterRange::List( |
| 5084 | zone, CharacterRange::Range(kLeadSurrogateStart, kLeadSurrogateEnd)); |
| 5085 | |
| 5086 | RegExpNode* match; |
| 5087 | if (compiler->read_backward()) { |
| 5088 | // Reading backward. Backward match the trail surrogate and assert that no |
| 5089 | // lead surrogate precedes it. |
| 5090 | match = MatchAndNegativeLookaroundInReadDirection( |
| 5091 | compiler, trail_surrogates, lead_surrogates, on_success, true); |
| 5092 | } else { |
| 5093 | // Reading forward. Assert that reading backward, there is no lead |
| 5094 | // surrogate, and then forward match the trail surrogate. |
| 5095 | match = NegativeLookaroundAgainstReadDirectionAndMatch( |
| 5096 | compiler, lead_surrogates, trail_surrogates, on_success, false); |
| 5097 | } |
| 5098 | result->AddAlternative(GuardedAlternative(match)); |
| 5099 | } |
| 5100 | |
| 5101 | RegExpNode* UnanchoredAdvance(RegExpCompiler* compiler, |
| 5102 | RegExpNode* on_success) { |
| 5103 | // This implements ES2015 21.2.5.2.3, AdvanceStringIndex. |
| 5104 | DCHECK(!compiler->read_backward()); |
| 5105 | Zone* zone = compiler->zone(); |
| 5106 | // Advance any character. If the character happens to be a lead surrogate and |
| 5107 | // we advanced into the middle of a surrogate pair, it will work out, as |
| 5108 | // nothing will match from there. We will have to advance again, consuming |
| 5109 | // the associated trail surrogate. |
| 5110 | ZoneList<CharacterRange>* range = CharacterRange::List( |
| 5111 | zone, CharacterRange::Range(0, String::kMaxUtf16CodeUnit)); |
| 5112 | return TextNode::CreateForCharacterRanges(zone, range, false, on_success); |
| 5113 | } |
| 5114 | |
| 5115 | |
| 5116 | void AddUnicodeCaseEquivalents(RegExpCompiler* compiler, |
| 5117 | ZoneList<CharacterRange>* ranges) { |
| 5118 | #ifdef V8_I18N_SUPPORT |
| 5119 | // Use ICU to compute the case fold closure over the ranges. |
| 5120 | DCHECK(compiler->unicode()); |
| 5121 | DCHECK(compiler->ignore_case()); |
| 5122 | USet* set = uset_openEmpty(); |
| 5123 | for (int i = 0; i < ranges->length(); i++) { |
| 5124 | uset_addRange(set, ranges->at(i).from(), ranges->at(i).to()); |
| 5125 | } |
| 5126 | ranges->Clear(); |
| 5127 | uset_closeOver(set, USET_CASE_INSENSITIVE); |
| 5128 | // Full case mapping map single characters to multiple characters. |
| 5129 | // Those are represented as strings in the set. Remove them so that |
| 5130 | // we end up with only simple and common case mappings. |
| 5131 | uset_removeAllStrings(set); |
| 5132 | int item_count = uset_getItemCount(set); |
| 5133 | int item_result = 0; |
| 5134 | UErrorCode ec = U_ZERO_ERROR; |
| 5135 | Zone* zone = compiler->zone(); |
| 5136 | for (int i = 0; i < item_count; i++) { |
| 5137 | uc32 start = 0; |
| 5138 | uc32 end = 0; |
| 5139 | item_result += uset_getItem(set, i, &start, &end, nullptr, 0, &ec); |
| 5140 | ranges->Add(CharacterRange::Range(start, end), zone); |
| 5141 | } |
| 5142 | // No errors and everything we collected have been ranges. |
| 5143 | DCHECK_EQ(U_ZERO_ERROR, ec); |
| 5144 | DCHECK_EQ(0, item_result); |
| 5145 | uset_close(set); |
| 5146 | #else |
| 5147 | // Fallback if ICU is not included. |
| 5148 | CharacterRange::AddCaseEquivalents(compiler->isolate(), compiler->zone(), |
| 5149 | ranges, compiler->one_byte()); |
| 5150 | #endif // V8_I18N_SUPPORT |
| 5151 | CharacterRange::Canonicalize(ranges); |
| 5152 | } |
| 5153 | |
| 5154 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 5155 | RegExpNode* RegExpCharacterClass::ToNode(RegExpCompiler* compiler, |
| 5156 | RegExpNode* on_success) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 5157 | set_.Canonicalize(); |
| 5158 | Zone* zone = compiler->zone(); |
| 5159 | ZoneList<CharacterRange>* ranges = this->ranges(zone); |
| 5160 | if (compiler->unicode() && compiler->ignore_case()) { |
| 5161 | AddUnicodeCaseEquivalents(compiler, ranges); |
| 5162 | } |
| 5163 | if (compiler->unicode() && !compiler->one_byte()) { |
| 5164 | if (is_negated()) { |
| 5165 | ZoneList<CharacterRange>* negated = |
| 5166 | new (zone) ZoneList<CharacterRange>(2, zone); |
| 5167 | CharacterRange::Negate(ranges, negated, zone); |
| 5168 | ranges = negated; |
| 5169 | } |
| 5170 | if (ranges->length() == 0) { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 5171 | ranges->Add(CharacterRange::Everything(), zone); |
| 5172 | RegExpCharacterClass* fail = |
| 5173 | new (zone) RegExpCharacterClass(ranges, true); |
| 5174 | return new (zone) TextNode(fail, compiler->read_backward(), on_success); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 5175 | } |
| 5176 | if (standard_type() == '*') { |
| 5177 | return UnanchoredAdvance(compiler, on_success); |
| 5178 | } else { |
| 5179 | ChoiceNode* result = new (zone) ChoiceNode(2, zone); |
| 5180 | UnicodeRangeSplitter splitter(zone, ranges); |
| 5181 | AddBmpCharacters(compiler, result, on_success, &splitter); |
| 5182 | AddNonBmpSurrogatePairs(compiler, result, on_success, &splitter); |
| 5183 | AddLoneLeadSurrogates(compiler, result, on_success, &splitter); |
| 5184 | AddLoneTrailSurrogates(compiler, result, on_success, &splitter); |
| 5185 | return result; |
| 5186 | } |
| 5187 | } else { |
| 5188 | return new (zone) TextNode(this, compiler->read_backward(), on_success); |
| 5189 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 5190 | } |
| 5191 | |
| 5192 | |
| 5193 | int CompareFirstChar(RegExpTree* const* a, RegExpTree* const* b) { |
| 5194 | RegExpAtom* atom1 = (*a)->AsAtom(); |
| 5195 | RegExpAtom* atom2 = (*b)->AsAtom(); |
| 5196 | uc16 character1 = atom1->data().at(0); |
| 5197 | uc16 character2 = atom2->data().at(0); |
| 5198 | if (character1 < character2) return -1; |
| 5199 | if (character1 > character2) return 1; |
| 5200 | return 0; |
| 5201 | } |
| 5202 | |
| 5203 | |
| 5204 | static unibrow::uchar Canonical( |
| 5205 | unibrow::Mapping<unibrow::Ecma262Canonicalize>* canonicalize, |
| 5206 | unibrow::uchar c) { |
| 5207 | unibrow::uchar chars[unibrow::Ecma262Canonicalize::kMaxWidth]; |
| 5208 | int length = canonicalize->get(c, '\0', chars); |
| 5209 | DCHECK_LE(length, 1); |
| 5210 | unibrow::uchar canonical = c; |
| 5211 | if (length == 1) canonical = chars[0]; |
| 5212 | return canonical; |
| 5213 | } |
| 5214 | |
| 5215 | |
| 5216 | int CompareFirstCharCaseIndependent( |
| 5217 | unibrow::Mapping<unibrow::Ecma262Canonicalize>* canonicalize, |
| 5218 | RegExpTree* const* a, RegExpTree* const* b) { |
| 5219 | RegExpAtom* atom1 = (*a)->AsAtom(); |
| 5220 | RegExpAtom* atom2 = (*b)->AsAtom(); |
| 5221 | unibrow::uchar character1 = atom1->data().at(0); |
| 5222 | unibrow::uchar character2 = atom2->data().at(0); |
| 5223 | if (character1 == character2) return 0; |
| 5224 | if (character1 >= 'a' || character2 >= 'a') { |
| 5225 | character1 = Canonical(canonicalize, character1); |
| 5226 | character2 = Canonical(canonicalize, character2); |
| 5227 | } |
| 5228 | return static_cast<int>(character1) - static_cast<int>(character2); |
| 5229 | } |
| 5230 | |
| 5231 | |
| 5232 | // We can stable sort runs of atoms, since the order does not matter if they |
| 5233 | // start with different characters. |
| 5234 | // Returns true if any consecutive atoms were found. |
| 5235 | bool RegExpDisjunction::SortConsecutiveAtoms(RegExpCompiler* compiler) { |
| 5236 | ZoneList<RegExpTree*>* alternatives = this->alternatives(); |
| 5237 | int length = alternatives->length(); |
| 5238 | bool found_consecutive_atoms = false; |
| 5239 | for (int i = 0; i < length; i++) { |
| 5240 | while (i < length) { |
| 5241 | RegExpTree* alternative = alternatives->at(i); |
| 5242 | if (alternative->IsAtom()) break; |
| 5243 | i++; |
| 5244 | } |
| 5245 | // i is length or it is the index of an atom. |
| 5246 | if (i == length) break; |
| 5247 | int first_atom = i; |
| 5248 | i++; |
| 5249 | while (i < length) { |
| 5250 | RegExpTree* alternative = alternatives->at(i); |
| 5251 | if (!alternative->IsAtom()) break; |
| 5252 | i++; |
| 5253 | } |
| 5254 | // Sort atoms to get ones with common prefixes together. |
| 5255 | // This step is more tricky if we are in a case-independent regexp, |
| 5256 | // because it would change /is|I/ to /I|is/, and order matters when |
| 5257 | // the regexp parts don't match only disjoint starting points. To fix |
| 5258 | // this we have a version of CompareFirstChar that uses case- |
| 5259 | // independent character classes for comparison. |
| 5260 | DCHECK_LT(first_atom, alternatives->length()); |
| 5261 | DCHECK_LE(i, alternatives->length()); |
| 5262 | DCHECK_LE(first_atom, i); |
| 5263 | if (compiler->ignore_case()) { |
| 5264 | unibrow::Mapping<unibrow::Ecma262Canonicalize>* canonicalize = |
| 5265 | compiler->isolate()->regexp_macro_assembler_canonicalize(); |
| 5266 | auto compare_closure = |
| 5267 | [canonicalize](RegExpTree* const* a, RegExpTree* const* b) { |
| 5268 | return CompareFirstCharCaseIndependent(canonicalize, a, b); |
| 5269 | }; |
| 5270 | alternatives->StableSort(compare_closure, first_atom, i - first_atom); |
| 5271 | } else { |
| 5272 | alternatives->StableSort(CompareFirstChar, first_atom, i - first_atom); |
| 5273 | } |
| 5274 | if (i - first_atom > 1) found_consecutive_atoms = true; |
| 5275 | } |
| 5276 | return found_consecutive_atoms; |
| 5277 | } |
| 5278 | |
| 5279 | |
| 5280 | // Optimizes ab|ac|az to a(?:b|c|d). |
| 5281 | void RegExpDisjunction::RationalizeConsecutiveAtoms(RegExpCompiler* compiler) { |
| 5282 | Zone* zone = compiler->zone(); |
| 5283 | ZoneList<RegExpTree*>* alternatives = this->alternatives(); |
| 5284 | int length = alternatives->length(); |
| 5285 | |
| 5286 | int write_posn = 0; |
| 5287 | int i = 0; |
| 5288 | while (i < length) { |
| 5289 | RegExpTree* alternative = alternatives->at(i); |
| 5290 | if (!alternative->IsAtom()) { |
| 5291 | alternatives->at(write_posn++) = alternatives->at(i); |
| 5292 | i++; |
| 5293 | continue; |
| 5294 | } |
| 5295 | RegExpAtom* atom = alternative->AsAtom(); |
| 5296 | unibrow::uchar common_prefix = atom->data().at(0); |
| 5297 | int first_with_prefix = i; |
| 5298 | int prefix_length = atom->length(); |
| 5299 | i++; |
| 5300 | while (i < length) { |
| 5301 | alternative = alternatives->at(i); |
| 5302 | if (!alternative->IsAtom()) break; |
| 5303 | atom = alternative->AsAtom(); |
| 5304 | unibrow::uchar new_prefix = atom->data().at(0); |
| 5305 | if (new_prefix != common_prefix) { |
| 5306 | if (!compiler->ignore_case()) break; |
| 5307 | unibrow::Mapping<unibrow::Ecma262Canonicalize>* canonicalize = |
| 5308 | compiler->isolate()->regexp_macro_assembler_canonicalize(); |
| 5309 | new_prefix = Canonical(canonicalize, new_prefix); |
| 5310 | common_prefix = Canonical(canonicalize, common_prefix); |
| 5311 | if (new_prefix != common_prefix) break; |
| 5312 | } |
| 5313 | prefix_length = Min(prefix_length, atom->length()); |
| 5314 | i++; |
| 5315 | } |
| 5316 | if (i > first_with_prefix + 2) { |
| 5317 | // Found worthwhile run of alternatives with common prefix of at least one |
| 5318 | // character. The sorting function above did not sort on more than one |
| 5319 | // character for reasons of correctness, but there may still be a longer |
| 5320 | // common prefix if the terms were similar or presorted in the input. |
| 5321 | // Find out how long the common prefix is. |
| 5322 | int run_length = i - first_with_prefix; |
| 5323 | atom = alternatives->at(first_with_prefix)->AsAtom(); |
| 5324 | for (int j = 1; j < run_length && prefix_length > 1; j++) { |
| 5325 | RegExpAtom* old_atom = |
| 5326 | alternatives->at(j + first_with_prefix)->AsAtom(); |
| 5327 | for (int k = 1; k < prefix_length; k++) { |
| 5328 | if (atom->data().at(k) != old_atom->data().at(k)) { |
| 5329 | prefix_length = k; |
| 5330 | break; |
| 5331 | } |
| 5332 | } |
| 5333 | } |
| 5334 | RegExpAtom* prefix = |
| 5335 | new (zone) RegExpAtom(atom->data().SubVector(0, prefix_length)); |
| 5336 | ZoneList<RegExpTree*>* pair = new (zone) ZoneList<RegExpTree*>(2, zone); |
| 5337 | pair->Add(prefix, zone); |
| 5338 | ZoneList<RegExpTree*>* suffixes = |
| 5339 | new (zone) ZoneList<RegExpTree*>(run_length, zone); |
| 5340 | for (int j = 0; j < run_length; j++) { |
| 5341 | RegExpAtom* old_atom = |
| 5342 | alternatives->at(j + first_with_prefix)->AsAtom(); |
| 5343 | int len = old_atom->length(); |
| 5344 | if (len == prefix_length) { |
| 5345 | suffixes->Add(new (zone) RegExpEmpty(), zone); |
| 5346 | } else { |
| 5347 | RegExpTree* suffix = new (zone) RegExpAtom( |
| 5348 | old_atom->data().SubVector(prefix_length, old_atom->length())); |
| 5349 | suffixes->Add(suffix, zone); |
| 5350 | } |
| 5351 | } |
| 5352 | pair->Add(new (zone) RegExpDisjunction(suffixes), zone); |
| 5353 | alternatives->at(write_posn++) = new (zone) RegExpAlternative(pair); |
| 5354 | } else { |
| 5355 | // Just copy any non-worthwhile alternatives. |
| 5356 | for (int j = first_with_prefix; j < i; j++) { |
| 5357 | alternatives->at(write_posn++) = alternatives->at(j); |
| 5358 | } |
| 5359 | } |
| 5360 | } |
| 5361 | alternatives->Rewind(write_posn); // Trim end of array. |
| 5362 | } |
| 5363 | |
| 5364 | |
| 5365 | // Optimizes b|c|z to [bcz]. |
| 5366 | void RegExpDisjunction::FixSingleCharacterDisjunctions( |
| 5367 | RegExpCompiler* compiler) { |
| 5368 | Zone* zone = compiler->zone(); |
| 5369 | ZoneList<RegExpTree*>* alternatives = this->alternatives(); |
| 5370 | int length = alternatives->length(); |
| 5371 | |
| 5372 | int write_posn = 0; |
| 5373 | int i = 0; |
| 5374 | while (i < length) { |
| 5375 | RegExpTree* alternative = alternatives->at(i); |
| 5376 | if (!alternative->IsAtom()) { |
| 5377 | alternatives->at(write_posn++) = alternatives->at(i); |
| 5378 | i++; |
| 5379 | continue; |
| 5380 | } |
| 5381 | RegExpAtom* atom = alternative->AsAtom(); |
| 5382 | if (atom->length() != 1) { |
| 5383 | alternatives->at(write_posn++) = alternatives->at(i); |
| 5384 | i++; |
| 5385 | continue; |
| 5386 | } |
| 5387 | int first_in_run = i; |
| 5388 | i++; |
| 5389 | while (i < length) { |
| 5390 | alternative = alternatives->at(i); |
| 5391 | if (!alternative->IsAtom()) break; |
| 5392 | atom = alternative->AsAtom(); |
| 5393 | if (atom->length() != 1) break; |
| 5394 | i++; |
| 5395 | } |
| 5396 | if (i > first_in_run + 1) { |
| 5397 | // Found non-trivial run of single-character alternatives. |
| 5398 | int run_length = i - first_in_run; |
| 5399 | ZoneList<CharacterRange>* ranges = |
| 5400 | new (zone) ZoneList<CharacterRange>(2, zone); |
| 5401 | for (int j = 0; j < run_length; j++) { |
| 5402 | RegExpAtom* old_atom = alternatives->at(j + first_in_run)->AsAtom(); |
| 5403 | DCHECK_EQ(old_atom->length(), 1); |
| 5404 | ranges->Add(CharacterRange::Singleton(old_atom->data().at(0)), zone); |
| 5405 | } |
| 5406 | alternatives->at(write_posn++) = |
| 5407 | new (zone) RegExpCharacterClass(ranges, false); |
| 5408 | } else { |
| 5409 | // Just copy any trivial alternatives. |
| 5410 | for (int j = first_in_run; j < i; j++) { |
| 5411 | alternatives->at(write_posn++) = alternatives->at(j); |
| 5412 | } |
| 5413 | } |
| 5414 | } |
| 5415 | alternatives->Rewind(write_posn); // Trim end of array. |
| 5416 | } |
| 5417 | |
| 5418 | |
| 5419 | RegExpNode* RegExpDisjunction::ToNode(RegExpCompiler* compiler, |
| 5420 | RegExpNode* on_success) { |
| 5421 | ZoneList<RegExpTree*>* alternatives = this->alternatives(); |
| 5422 | |
| 5423 | if (alternatives->length() > 2) { |
| 5424 | bool found_consecutive_atoms = SortConsecutiveAtoms(compiler); |
| 5425 | if (found_consecutive_atoms) RationalizeConsecutiveAtoms(compiler); |
| 5426 | FixSingleCharacterDisjunctions(compiler); |
| 5427 | if (alternatives->length() == 1) { |
| 5428 | return alternatives->at(0)->ToNode(compiler, on_success); |
| 5429 | } |
| 5430 | } |
| 5431 | |
| 5432 | int length = alternatives->length(); |
| 5433 | |
| 5434 | ChoiceNode* result = |
| 5435 | new(compiler->zone()) ChoiceNode(length, compiler->zone()); |
| 5436 | for (int i = 0; i < length; i++) { |
| 5437 | GuardedAlternative alternative(alternatives->at(i)->ToNode(compiler, |
| 5438 | on_success)); |
| 5439 | result->AddAlternative(alternative); |
| 5440 | } |
| 5441 | return result; |
| 5442 | } |
| 5443 | |
| 5444 | |
| 5445 | RegExpNode* RegExpQuantifier::ToNode(RegExpCompiler* compiler, |
| 5446 | RegExpNode* on_success) { |
| 5447 | return ToNode(min(), |
| 5448 | max(), |
| 5449 | is_greedy(), |
| 5450 | body(), |
| 5451 | compiler, |
| 5452 | on_success); |
| 5453 | } |
| 5454 | |
| 5455 | |
| 5456 | // Scoped object to keep track of how much we unroll quantifier loops in the |
| 5457 | // regexp graph generator. |
| 5458 | class RegExpExpansionLimiter { |
| 5459 | public: |
| 5460 | static const int kMaxExpansionFactor = 6; |
| 5461 | RegExpExpansionLimiter(RegExpCompiler* compiler, int factor) |
| 5462 | : compiler_(compiler), |
| 5463 | saved_expansion_factor_(compiler->current_expansion_factor()), |
| 5464 | ok_to_expand_(saved_expansion_factor_ <= kMaxExpansionFactor) { |
| 5465 | DCHECK(factor > 0); |
| 5466 | if (ok_to_expand_) { |
| 5467 | if (factor > kMaxExpansionFactor) { |
| 5468 | // Avoid integer overflow of the current expansion factor. |
| 5469 | ok_to_expand_ = false; |
| 5470 | compiler->set_current_expansion_factor(kMaxExpansionFactor + 1); |
| 5471 | } else { |
| 5472 | int new_factor = saved_expansion_factor_ * factor; |
| 5473 | ok_to_expand_ = (new_factor <= kMaxExpansionFactor); |
| 5474 | compiler->set_current_expansion_factor(new_factor); |
| 5475 | } |
| 5476 | } |
| 5477 | } |
| 5478 | |
| 5479 | ~RegExpExpansionLimiter() { |
| 5480 | compiler_->set_current_expansion_factor(saved_expansion_factor_); |
| 5481 | } |
| 5482 | |
| 5483 | bool ok_to_expand() { return ok_to_expand_; } |
| 5484 | |
| 5485 | private: |
| 5486 | RegExpCompiler* compiler_; |
| 5487 | int saved_expansion_factor_; |
| 5488 | bool ok_to_expand_; |
| 5489 | |
| 5490 | DISALLOW_IMPLICIT_CONSTRUCTORS(RegExpExpansionLimiter); |
| 5491 | }; |
| 5492 | |
| 5493 | |
| 5494 | RegExpNode* RegExpQuantifier::ToNode(int min, |
| 5495 | int max, |
| 5496 | bool is_greedy, |
| 5497 | RegExpTree* body, |
| 5498 | RegExpCompiler* compiler, |
| 5499 | RegExpNode* on_success, |
| 5500 | bool not_at_start) { |
| 5501 | // x{f, t} becomes this: |
| 5502 | // |
| 5503 | // (r++)<-. |
| 5504 | // | ` |
| 5505 | // | (x) |
| 5506 | // v ^ |
| 5507 | // (r=0)-->(?)---/ [if r < t] |
| 5508 | // | |
| 5509 | // [if r >= f] \----> ... |
| 5510 | // |
| 5511 | |
| 5512 | // 15.10.2.5 RepeatMatcher algorithm. |
| 5513 | // The parser has already eliminated the case where max is 0. In the case |
| 5514 | // where max_match is zero the parser has removed the quantifier if min was |
| 5515 | // > 0 and removed the atom if min was 0. See AddQuantifierToAtom. |
| 5516 | |
| 5517 | // If we know that we cannot match zero length then things are a little |
| 5518 | // simpler since we don't need to make the special zero length match check |
| 5519 | // from step 2.1. If the min and max are small we can unroll a little in |
| 5520 | // this case. |
| 5521 | static const int kMaxUnrolledMinMatches = 3; // Unroll (foo)+ and (foo){3,} |
| 5522 | static const int kMaxUnrolledMaxMatches = 3; // Unroll (foo)? and (foo){x,3} |
| 5523 | if (max == 0) return on_success; // This can happen due to recursion. |
| 5524 | bool body_can_be_empty = (body->min_match() == 0); |
| 5525 | int body_start_reg = RegExpCompiler::kNoRegister; |
| 5526 | Interval capture_registers = body->CaptureRegisters(); |
| 5527 | bool needs_capture_clearing = !capture_registers.is_empty(); |
| 5528 | Zone* zone = compiler->zone(); |
| 5529 | |
| 5530 | if (body_can_be_empty) { |
| 5531 | body_start_reg = compiler->AllocateRegister(); |
| 5532 | } else if (compiler->optimize() && !needs_capture_clearing) { |
| 5533 | // Only unroll if there are no captures and the body can't be |
| 5534 | // empty. |
| 5535 | { |
| 5536 | RegExpExpansionLimiter limiter( |
| 5537 | compiler, min + ((max != min) ? 1 : 0)); |
| 5538 | if (min > 0 && min <= kMaxUnrolledMinMatches && limiter.ok_to_expand()) { |
| 5539 | int new_max = (max == kInfinity) ? max : max - min; |
| 5540 | // Recurse once to get the loop or optional matches after the fixed |
| 5541 | // ones. |
| 5542 | RegExpNode* answer = ToNode( |
| 5543 | 0, new_max, is_greedy, body, compiler, on_success, true); |
| 5544 | // Unroll the forced matches from 0 to min. This can cause chains of |
| 5545 | // TextNodes (which the parser does not generate). These should be |
| 5546 | // combined if it turns out they hinder good code generation. |
| 5547 | for (int i = 0; i < min; i++) { |
| 5548 | answer = body->ToNode(compiler, answer); |
| 5549 | } |
| 5550 | return answer; |
| 5551 | } |
| 5552 | } |
| 5553 | if (max <= kMaxUnrolledMaxMatches && min == 0) { |
| 5554 | DCHECK(max > 0); // Due to the 'if' above. |
| 5555 | RegExpExpansionLimiter limiter(compiler, max); |
| 5556 | if (limiter.ok_to_expand()) { |
| 5557 | // Unroll the optional matches up to max. |
| 5558 | RegExpNode* answer = on_success; |
| 5559 | for (int i = 0; i < max; i++) { |
| 5560 | ChoiceNode* alternation = new(zone) ChoiceNode(2, zone); |
| 5561 | if (is_greedy) { |
| 5562 | alternation->AddAlternative( |
| 5563 | GuardedAlternative(body->ToNode(compiler, answer))); |
| 5564 | alternation->AddAlternative(GuardedAlternative(on_success)); |
| 5565 | } else { |
| 5566 | alternation->AddAlternative(GuardedAlternative(on_success)); |
| 5567 | alternation->AddAlternative( |
| 5568 | GuardedAlternative(body->ToNode(compiler, answer))); |
| 5569 | } |
| 5570 | answer = alternation; |
| 5571 | if (not_at_start && !compiler->read_backward()) { |
| 5572 | alternation->set_not_at_start(); |
| 5573 | } |
| 5574 | } |
| 5575 | return answer; |
| 5576 | } |
| 5577 | } |
| 5578 | } |
| 5579 | bool has_min = min > 0; |
| 5580 | bool has_max = max < RegExpTree::kInfinity; |
| 5581 | bool needs_counter = has_min || has_max; |
| 5582 | int reg_ctr = needs_counter |
| 5583 | ? compiler->AllocateRegister() |
| 5584 | : RegExpCompiler::kNoRegister; |
| 5585 | LoopChoiceNode* center = new (zone) |
| 5586 | LoopChoiceNode(body->min_match() == 0, compiler->read_backward(), zone); |
| 5587 | if (not_at_start && !compiler->read_backward()) center->set_not_at_start(); |
| 5588 | RegExpNode* loop_return = needs_counter |
| 5589 | ? static_cast<RegExpNode*>(ActionNode::IncrementRegister(reg_ctr, center)) |
| 5590 | : static_cast<RegExpNode*>(center); |
| 5591 | if (body_can_be_empty) { |
| 5592 | // If the body can be empty we need to check if it was and then |
| 5593 | // backtrack. |
| 5594 | loop_return = ActionNode::EmptyMatchCheck(body_start_reg, |
| 5595 | reg_ctr, |
| 5596 | min, |
| 5597 | loop_return); |
| 5598 | } |
| 5599 | RegExpNode* body_node = body->ToNode(compiler, loop_return); |
| 5600 | if (body_can_be_empty) { |
| 5601 | // If the body can be empty we need to store the start position |
| 5602 | // so we can bail out if it was empty. |
| 5603 | body_node = ActionNode::StorePosition(body_start_reg, false, body_node); |
| 5604 | } |
| 5605 | if (needs_capture_clearing) { |
| 5606 | // Before entering the body of this loop we need to clear captures. |
| 5607 | body_node = ActionNode::ClearCaptures(capture_registers, body_node); |
| 5608 | } |
| 5609 | GuardedAlternative body_alt(body_node); |
| 5610 | if (has_max) { |
| 5611 | Guard* body_guard = |
| 5612 | new(zone) Guard(reg_ctr, Guard::LT, max); |
| 5613 | body_alt.AddGuard(body_guard, zone); |
| 5614 | } |
| 5615 | GuardedAlternative rest_alt(on_success); |
| 5616 | if (has_min) { |
| 5617 | Guard* rest_guard = new(compiler->zone()) Guard(reg_ctr, Guard::GEQ, min); |
| 5618 | rest_alt.AddGuard(rest_guard, zone); |
| 5619 | } |
| 5620 | if (is_greedy) { |
| 5621 | center->AddLoopAlternative(body_alt); |
| 5622 | center->AddContinueAlternative(rest_alt); |
| 5623 | } else { |
| 5624 | center->AddContinueAlternative(rest_alt); |
| 5625 | center->AddLoopAlternative(body_alt); |
| 5626 | } |
| 5627 | if (needs_counter) { |
| 5628 | return ActionNode::SetRegister(reg_ctr, 0, center); |
| 5629 | } else { |
| 5630 | return center; |
| 5631 | } |
| 5632 | } |
| 5633 | |
| 5634 | |
| 5635 | RegExpNode* RegExpAssertion::ToNode(RegExpCompiler* compiler, |
| 5636 | RegExpNode* on_success) { |
| 5637 | NodeInfo info; |
| 5638 | Zone* zone = compiler->zone(); |
| 5639 | |
| 5640 | switch (assertion_type()) { |
| 5641 | case START_OF_LINE: |
| 5642 | return AssertionNode::AfterNewline(on_success); |
| 5643 | case START_OF_INPUT: |
| 5644 | return AssertionNode::AtStart(on_success); |
| 5645 | case BOUNDARY: |
| 5646 | return AssertionNode::AtBoundary(on_success); |
| 5647 | case NON_BOUNDARY: |
| 5648 | return AssertionNode::AtNonBoundary(on_success); |
| 5649 | case END_OF_INPUT: |
| 5650 | return AssertionNode::AtEnd(on_success); |
| 5651 | case END_OF_LINE: { |
| 5652 | // Compile $ in multiline regexps as an alternation with a positive |
| 5653 | // lookahead in one side and an end-of-input on the other side. |
| 5654 | // We need two registers for the lookahead. |
| 5655 | int stack_pointer_register = compiler->AllocateRegister(); |
| 5656 | int position_register = compiler->AllocateRegister(); |
| 5657 | // The ChoiceNode to distinguish between a newline and end-of-input. |
| 5658 | ChoiceNode* result = new(zone) ChoiceNode(2, zone); |
| 5659 | // Create a newline atom. |
| 5660 | ZoneList<CharacterRange>* newline_ranges = |
| 5661 | new(zone) ZoneList<CharacterRange>(3, zone); |
| 5662 | CharacterRange::AddClassEscape('n', newline_ranges, zone); |
| 5663 | RegExpCharacterClass* newline_atom = new (zone) RegExpCharacterClass('n'); |
| 5664 | TextNode* newline_matcher = new (zone) TextNode( |
| 5665 | newline_atom, false, ActionNode::PositiveSubmatchSuccess( |
| 5666 | stack_pointer_register, position_register, |
| 5667 | 0, // No captures inside. |
| 5668 | -1, // Ignored if no captures. |
| 5669 | on_success)); |
| 5670 | // Create an end-of-input matcher. |
| 5671 | RegExpNode* end_of_line = ActionNode::BeginSubmatch( |
| 5672 | stack_pointer_register, |
| 5673 | position_register, |
| 5674 | newline_matcher); |
| 5675 | // Add the two alternatives to the ChoiceNode. |
| 5676 | GuardedAlternative eol_alternative(end_of_line); |
| 5677 | result->AddAlternative(eol_alternative); |
| 5678 | GuardedAlternative end_alternative(AssertionNode::AtEnd(on_success)); |
| 5679 | result->AddAlternative(end_alternative); |
| 5680 | return result; |
| 5681 | } |
| 5682 | default: |
| 5683 | UNREACHABLE(); |
| 5684 | } |
| 5685 | return on_success; |
| 5686 | } |
| 5687 | |
| 5688 | |
| 5689 | RegExpNode* RegExpBackReference::ToNode(RegExpCompiler* compiler, |
| 5690 | RegExpNode* on_success) { |
| 5691 | return new (compiler->zone()) |
| 5692 | BackReferenceNode(RegExpCapture::StartRegister(index()), |
| 5693 | RegExpCapture::EndRegister(index()), |
| 5694 | compiler->read_backward(), on_success); |
| 5695 | } |
| 5696 | |
| 5697 | |
| 5698 | RegExpNode* RegExpEmpty::ToNode(RegExpCompiler* compiler, |
| 5699 | RegExpNode* on_success) { |
| 5700 | return on_success; |
| 5701 | } |
| 5702 | |
| 5703 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 5704 | RegExpLookaround::Builder::Builder(bool is_positive, RegExpNode* on_success, |
| 5705 | int stack_pointer_register, |
| 5706 | int position_register, |
| 5707 | int capture_register_count, |
| 5708 | int capture_register_start) |
| 5709 | : is_positive_(is_positive), |
| 5710 | on_success_(on_success), |
| 5711 | stack_pointer_register_(stack_pointer_register), |
| 5712 | position_register_(position_register) { |
| 5713 | if (is_positive_) { |
| 5714 | on_match_success_ = ActionNode::PositiveSubmatchSuccess( |
| 5715 | stack_pointer_register, position_register, capture_register_count, |
| 5716 | capture_register_start, on_success_); |
| 5717 | } else { |
| 5718 | Zone* zone = on_success_->zone(); |
| 5719 | on_match_success_ = new (zone) NegativeSubmatchSuccess( |
| 5720 | stack_pointer_register, position_register, capture_register_count, |
| 5721 | capture_register_start, zone); |
| 5722 | } |
| 5723 | } |
| 5724 | |
| 5725 | |
| 5726 | RegExpNode* RegExpLookaround::Builder::ForMatch(RegExpNode* match) { |
| 5727 | if (is_positive_) { |
| 5728 | return ActionNode::BeginSubmatch(stack_pointer_register_, |
| 5729 | position_register_, match); |
| 5730 | } else { |
| 5731 | Zone* zone = on_success_->zone(); |
| 5732 | // We use a ChoiceNode to represent the negative lookaround. The first |
| 5733 | // alternative is the negative match. On success, the end node backtracks. |
| 5734 | // On failure, the second alternative is tried and leads to success. |
| 5735 | // NegativeLookaheadChoiceNode is a special ChoiceNode that ignores the |
| 5736 | // first exit when calculating quick checks. |
| 5737 | ChoiceNode* choice_node = new (zone) NegativeLookaroundChoiceNode( |
| 5738 | GuardedAlternative(match), GuardedAlternative(on_success_), zone); |
| 5739 | return ActionNode::BeginSubmatch(stack_pointer_register_, |
| 5740 | position_register_, choice_node); |
| 5741 | } |
| 5742 | } |
| 5743 | |
| 5744 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 5745 | RegExpNode* RegExpLookaround::ToNode(RegExpCompiler* compiler, |
| 5746 | RegExpNode* on_success) { |
| 5747 | int stack_pointer_register = compiler->AllocateRegister(); |
| 5748 | int position_register = compiler->AllocateRegister(); |
| 5749 | |
| 5750 | const int registers_per_capture = 2; |
| 5751 | const int register_of_first_capture = 2; |
| 5752 | int register_count = capture_count_ * registers_per_capture; |
| 5753 | int register_start = |
| 5754 | register_of_first_capture + capture_from_ * registers_per_capture; |
| 5755 | |
| 5756 | RegExpNode* result; |
| 5757 | bool was_reading_backward = compiler->read_backward(); |
| 5758 | compiler->set_read_backward(type() == LOOKBEHIND); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 5759 | Builder builder(is_positive(), on_success, stack_pointer_register, |
| 5760 | position_register, register_count, register_start); |
| 5761 | RegExpNode* match = body_->ToNode(compiler, builder.on_match_success()); |
| 5762 | result = builder.ForMatch(match); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 5763 | compiler->set_read_backward(was_reading_backward); |
| 5764 | return result; |
| 5765 | } |
| 5766 | |
| 5767 | |
| 5768 | RegExpNode* RegExpCapture::ToNode(RegExpCompiler* compiler, |
| 5769 | RegExpNode* on_success) { |
| 5770 | return ToNode(body(), index(), compiler, on_success); |
| 5771 | } |
| 5772 | |
| 5773 | |
| 5774 | RegExpNode* RegExpCapture::ToNode(RegExpTree* body, |
| 5775 | int index, |
| 5776 | RegExpCompiler* compiler, |
| 5777 | RegExpNode* on_success) { |
| 5778 | DCHECK_NOT_NULL(body); |
| 5779 | int start_reg = RegExpCapture::StartRegister(index); |
| 5780 | int end_reg = RegExpCapture::EndRegister(index); |
| 5781 | if (compiler->read_backward()) std::swap(start_reg, end_reg); |
| 5782 | RegExpNode* store_end = ActionNode::StorePosition(end_reg, true, on_success); |
| 5783 | RegExpNode* body_node = body->ToNode(compiler, store_end); |
| 5784 | return ActionNode::StorePosition(start_reg, true, body_node); |
| 5785 | } |
| 5786 | |
| 5787 | |
| 5788 | RegExpNode* RegExpAlternative::ToNode(RegExpCompiler* compiler, |
| 5789 | RegExpNode* on_success) { |
| 5790 | ZoneList<RegExpTree*>* children = nodes(); |
| 5791 | RegExpNode* current = on_success; |
| 5792 | if (compiler->read_backward()) { |
| 5793 | for (int i = 0; i < children->length(); i++) { |
| 5794 | current = children->at(i)->ToNode(compiler, current); |
| 5795 | } |
| 5796 | } else { |
| 5797 | for (int i = children->length() - 1; i >= 0; i--) { |
| 5798 | current = children->at(i)->ToNode(compiler, current); |
| 5799 | } |
| 5800 | } |
| 5801 | return current; |
| 5802 | } |
| 5803 | |
| 5804 | |
| 5805 | static void AddClass(const int* elmv, |
| 5806 | int elmc, |
| 5807 | ZoneList<CharacterRange>* ranges, |
| 5808 | Zone* zone) { |
| 5809 | elmc--; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 5810 | DCHECK(elmv[elmc] == kRangeEndMarker); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 5811 | for (int i = 0; i < elmc; i += 2) { |
| 5812 | DCHECK(elmv[i] < elmv[i + 1]); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 5813 | ranges->Add(CharacterRange::Range(elmv[i], elmv[i + 1] - 1), zone); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 5814 | } |
| 5815 | } |
| 5816 | |
| 5817 | |
| 5818 | static void AddClassNegated(const int *elmv, |
| 5819 | int elmc, |
| 5820 | ZoneList<CharacterRange>* ranges, |
| 5821 | Zone* zone) { |
| 5822 | elmc--; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 5823 | DCHECK(elmv[elmc] == kRangeEndMarker); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 5824 | DCHECK(elmv[0] != 0x0000); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 5825 | DCHECK(elmv[elmc - 1] != String::kMaxCodePoint); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 5826 | uc16 last = 0x0000; |
| 5827 | for (int i = 0; i < elmc; i += 2) { |
| 5828 | DCHECK(last <= elmv[i] - 1); |
| 5829 | DCHECK(elmv[i] < elmv[i + 1]); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 5830 | ranges->Add(CharacterRange::Range(last, elmv[i] - 1), zone); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 5831 | last = elmv[i + 1]; |
| 5832 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 5833 | ranges->Add(CharacterRange::Range(last, String::kMaxCodePoint), zone); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 5834 | } |
| 5835 | |
| 5836 | |
| 5837 | void CharacterRange::AddClassEscape(uc16 type, |
| 5838 | ZoneList<CharacterRange>* ranges, |
| 5839 | Zone* zone) { |
| 5840 | switch (type) { |
| 5841 | case 's': |
| 5842 | AddClass(kSpaceRanges, kSpaceRangeCount, ranges, zone); |
| 5843 | break; |
| 5844 | case 'S': |
| 5845 | AddClassNegated(kSpaceRanges, kSpaceRangeCount, ranges, zone); |
| 5846 | break; |
| 5847 | case 'w': |
| 5848 | AddClass(kWordRanges, kWordRangeCount, ranges, zone); |
| 5849 | break; |
| 5850 | case 'W': |
| 5851 | AddClassNegated(kWordRanges, kWordRangeCount, ranges, zone); |
| 5852 | break; |
| 5853 | case 'd': |
| 5854 | AddClass(kDigitRanges, kDigitRangeCount, ranges, zone); |
| 5855 | break; |
| 5856 | case 'D': |
| 5857 | AddClassNegated(kDigitRanges, kDigitRangeCount, ranges, zone); |
| 5858 | break; |
| 5859 | case '.': |
| 5860 | AddClassNegated(kLineTerminatorRanges, |
| 5861 | kLineTerminatorRangeCount, |
| 5862 | ranges, |
| 5863 | zone); |
| 5864 | break; |
| 5865 | // This is not a character range as defined by the spec but a |
| 5866 | // convenient shorthand for a character class that matches any |
| 5867 | // character. |
| 5868 | case '*': |
| 5869 | ranges->Add(CharacterRange::Everything(), zone); |
| 5870 | break; |
| 5871 | // This is the set of characters matched by the $ and ^ symbols |
| 5872 | // in multiline mode. |
| 5873 | case 'n': |
| 5874 | AddClass(kLineTerminatorRanges, |
| 5875 | kLineTerminatorRangeCount, |
| 5876 | ranges, |
| 5877 | zone); |
| 5878 | break; |
| 5879 | default: |
| 5880 | UNREACHABLE(); |
| 5881 | } |
| 5882 | } |
| 5883 | |
| 5884 | |
| 5885 | Vector<const int> CharacterRange::GetWordBounds() { |
| 5886 | return Vector<const int>(kWordRanges, kWordRangeCount - 1); |
| 5887 | } |
| 5888 | |
| 5889 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 5890 | void CharacterRange::AddCaseEquivalents(Isolate* isolate, Zone* zone, |
| 5891 | ZoneList<CharacterRange>* ranges, |
| 5892 | bool is_one_byte) { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 5893 | CharacterRange::Canonicalize(ranges); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 5894 | int range_count = ranges->length(); |
| 5895 | for (int i = 0; i < range_count; i++) { |
| 5896 | CharacterRange range = ranges->at(i); |
| 5897 | uc32 bottom = range.from(); |
| 5898 | if (bottom > String::kMaxUtf16CodeUnit) return; |
| 5899 | uc32 top = Min(range.to(), String::kMaxUtf16CodeUnit); |
| 5900 | // Nothing to be done for surrogates. |
| 5901 | if (bottom >= kLeadSurrogateStart && top <= kTrailSurrogateEnd) return; |
| 5902 | if (is_one_byte && !RangeContainsLatin1Equivalents(range)) { |
| 5903 | if (bottom > String::kMaxOneByteCharCode) return; |
| 5904 | if (top > String::kMaxOneByteCharCode) top = String::kMaxOneByteCharCode; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 5905 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 5906 | unibrow::uchar chars[unibrow::Ecma262UnCanonicalize::kMaxWidth]; |
| 5907 | if (top == bottom) { |
| 5908 | // If this is a singleton we just expand the one character. |
| 5909 | int length = isolate->jsregexp_uncanonicalize()->get(bottom, '\0', chars); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 5910 | for (int i = 0; i < length; i++) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 5911 | uc32 chr = chars[i]; |
| 5912 | if (chr != bottom) { |
| 5913 | ranges->Add(CharacterRange::Singleton(chars[i]), zone); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 5914 | } |
| 5915 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 5916 | } else { |
| 5917 | // If this is a range we expand the characters block by block, expanding |
| 5918 | // contiguous subranges (blocks) one at a time. The approach is as |
| 5919 | // follows. For a given start character we look up the remainder of the |
| 5920 | // block that contains it (represented by the end point), for instance we |
| 5921 | // find 'z' if the character is 'c'. A block is characterized by the |
| 5922 | // property that all characters uncanonicalize in the same way, except |
| 5923 | // that each entry in the result is incremented by the distance from the |
| 5924 | // first element. So a-z is a block because 'a' uncanonicalizes to ['a', |
| 5925 | // 'A'] and the k'th letter uncanonicalizes to ['a' + k, 'A' + k]. Once |
| 5926 | // we've found the end point we look up its uncanonicalization and |
| 5927 | // produce a range for each element. For instance for [c-f] we look up |
| 5928 | // ['z', 'Z'] and produce [c-f] and [C-F]. We then only add a range if |
| 5929 | // it is not already contained in the input, so [c-f] will be skipped but |
| 5930 | // [C-F] will be added. If this range is not completely contained in a |
| 5931 | // block we do this for all the blocks covered by the range (handling |
| 5932 | // characters that is not in a block as a "singleton block"). |
| 5933 | unibrow::uchar equivalents[unibrow::Ecma262UnCanonicalize::kMaxWidth]; |
| 5934 | int pos = bottom; |
| 5935 | while (pos <= top) { |
| 5936 | int length = |
| 5937 | isolate->jsregexp_canonrange()->get(pos, '\0', equivalents); |
| 5938 | uc32 block_end; |
| 5939 | if (length == 0) { |
| 5940 | block_end = pos; |
| 5941 | } else { |
| 5942 | DCHECK_EQ(1, length); |
| 5943 | block_end = equivalents[0]; |
| 5944 | } |
| 5945 | int end = (block_end > top) ? top : block_end; |
| 5946 | length = isolate->jsregexp_uncanonicalize()->get(block_end, '\0', |
| 5947 | equivalents); |
| 5948 | for (int i = 0; i < length; i++) { |
| 5949 | uc32 c = equivalents[i]; |
| 5950 | uc32 range_from = c - (block_end - pos); |
| 5951 | uc32 range_to = c - (block_end - end); |
| 5952 | if (!(bottom <= range_from && range_to <= top)) { |
| 5953 | ranges->Add(CharacterRange::Range(range_from, range_to), zone); |
| 5954 | } |
| 5955 | } |
| 5956 | pos = end + 1; |
| 5957 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 5958 | } |
| 5959 | } |
| 5960 | } |
| 5961 | |
| 5962 | |
| 5963 | bool CharacterRange::IsCanonical(ZoneList<CharacterRange>* ranges) { |
| 5964 | DCHECK_NOT_NULL(ranges); |
| 5965 | int n = ranges->length(); |
| 5966 | if (n <= 1) return true; |
| 5967 | int max = ranges->at(0).to(); |
| 5968 | for (int i = 1; i < n; i++) { |
| 5969 | CharacterRange next_range = ranges->at(i); |
| 5970 | if (next_range.from() <= max + 1) return false; |
| 5971 | max = next_range.to(); |
| 5972 | } |
| 5973 | return true; |
| 5974 | } |
| 5975 | |
| 5976 | |
| 5977 | ZoneList<CharacterRange>* CharacterSet::ranges(Zone* zone) { |
| 5978 | if (ranges_ == NULL) { |
| 5979 | ranges_ = new(zone) ZoneList<CharacterRange>(2, zone); |
| 5980 | CharacterRange::AddClassEscape(standard_set_type_, ranges_, zone); |
| 5981 | } |
| 5982 | return ranges_; |
| 5983 | } |
| 5984 | |
| 5985 | |
| 5986 | // Move a number of elements in a zonelist to another position |
| 5987 | // in the same list. Handles overlapping source and target areas. |
| 5988 | static void MoveRanges(ZoneList<CharacterRange>* list, |
| 5989 | int from, |
| 5990 | int to, |
| 5991 | int count) { |
| 5992 | // Ranges are potentially overlapping. |
| 5993 | if (from < to) { |
| 5994 | for (int i = count - 1; i >= 0; i--) { |
| 5995 | list->at(to + i) = list->at(from + i); |
| 5996 | } |
| 5997 | } else { |
| 5998 | for (int i = 0; i < count; i++) { |
| 5999 | list->at(to + i) = list->at(from + i); |
| 6000 | } |
| 6001 | } |
| 6002 | } |
| 6003 | |
| 6004 | |
| 6005 | static int InsertRangeInCanonicalList(ZoneList<CharacterRange>* list, |
| 6006 | int count, |
| 6007 | CharacterRange insert) { |
| 6008 | // Inserts a range into list[0..count[, which must be sorted |
| 6009 | // by from value and non-overlapping and non-adjacent, using at most |
| 6010 | // list[0..count] for the result. Returns the number of resulting |
| 6011 | // canonicalized ranges. Inserting a range may collapse existing ranges into |
| 6012 | // fewer ranges, so the return value can be anything in the range 1..count+1. |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 6013 | uc32 from = insert.from(); |
| 6014 | uc32 to = insert.to(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6015 | int start_pos = 0; |
| 6016 | int end_pos = count; |
| 6017 | for (int i = count - 1; i >= 0; i--) { |
| 6018 | CharacterRange current = list->at(i); |
| 6019 | if (current.from() > to + 1) { |
| 6020 | end_pos = i; |
| 6021 | } else if (current.to() + 1 < from) { |
| 6022 | start_pos = i + 1; |
| 6023 | break; |
| 6024 | } |
| 6025 | } |
| 6026 | |
| 6027 | // Inserted range overlaps, or is adjacent to, ranges at positions |
| 6028 | // [start_pos..end_pos[. Ranges before start_pos or at or after end_pos are |
| 6029 | // not affected by the insertion. |
| 6030 | // If start_pos == end_pos, the range must be inserted before start_pos. |
| 6031 | // if start_pos < end_pos, the entire range from start_pos to end_pos |
| 6032 | // must be merged with the insert range. |
| 6033 | |
| 6034 | if (start_pos == end_pos) { |
| 6035 | // Insert between existing ranges at position start_pos. |
| 6036 | if (start_pos < count) { |
| 6037 | MoveRanges(list, start_pos, start_pos + 1, count - start_pos); |
| 6038 | } |
| 6039 | list->at(start_pos) = insert; |
| 6040 | return count + 1; |
| 6041 | } |
| 6042 | if (start_pos + 1 == end_pos) { |
| 6043 | // Replace single existing range at position start_pos. |
| 6044 | CharacterRange to_replace = list->at(start_pos); |
| 6045 | int new_from = Min(to_replace.from(), from); |
| 6046 | int new_to = Max(to_replace.to(), to); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 6047 | list->at(start_pos) = CharacterRange::Range(new_from, new_to); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6048 | return count; |
| 6049 | } |
| 6050 | // Replace a number of existing ranges from start_pos to end_pos - 1. |
| 6051 | // Move the remaining ranges down. |
| 6052 | |
| 6053 | int new_from = Min(list->at(start_pos).from(), from); |
| 6054 | int new_to = Max(list->at(end_pos - 1).to(), to); |
| 6055 | if (end_pos < count) { |
| 6056 | MoveRanges(list, end_pos, start_pos + 1, count - end_pos); |
| 6057 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 6058 | list->at(start_pos) = CharacterRange::Range(new_from, new_to); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6059 | return count - (end_pos - start_pos) + 1; |
| 6060 | } |
| 6061 | |
| 6062 | |
| 6063 | void CharacterSet::Canonicalize() { |
| 6064 | // Special/default classes are always considered canonical. The result |
| 6065 | // of calling ranges() will be sorted. |
| 6066 | if (ranges_ == NULL) return; |
| 6067 | CharacterRange::Canonicalize(ranges_); |
| 6068 | } |
| 6069 | |
| 6070 | |
| 6071 | void CharacterRange::Canonicalize(ZoneList<CharacterRange>* character_ranges) { |
| 6072 | if (character_ranges->length() <= 1) return; |
| 6073 | // Check whether ranges are already canonical (increasing, non-overlapping, |
| 6074 | // non-adjacent). |
| 6075 | int n = character_ranges->length(); |
| 6076 | int max = character_ranges->at(0).to(); |
| 6077 | int i = 1; |
| 6078 | while (i < n) { |
| 6079 | CharacterRange current = character_ranges->at(i); |
| 6080 | if (current.from() <= max + 1) { |
| 6081 | break; |
| 6082 | } |
| 6083 | max = current.to(); |
| 6084 | i++; |
| 6085 | } |
| 6086 | // Canonical until the i'th range. If that's all of them, we are done. |
| 6087 | if (i == n) return; |
| 6088 | |
| 6089 | // The ranges at index i and forward are not canonicalized. Make them so by |
| 6090 | // doing the equivalent of insertion sort (inserting each into the previous |
| 6091 | // list, in order). |
| 6092 | // Notice that inserting a range can reduce the number of ranges in the |
| 6093 | // result due to combining of adjacent and overlapping ranges. |
| 6094 | int read = i; // Range to insert. |
| 6095 | int num_canonical = i; // Length of canonicalized part of list. |
| 6096 | do { |
| 6097 | num_canonical = InsertRangeInCanonicalList(character_ranges, |
| 6098 | num_canonical, |
| 6099 | character_ranges->at(read)); |
| 6100 | read++; |
| 6101 | } while (read < n); |
| 6102 | character_ranges->Rewind(num_canonical); |
| 6103 | |
| 6104 | DCHECK(CharacterRange::IsCanonical(character_ranges)); |
| 6105 | } |
| 6106 | |
| 6107 | |
| 6108 | void CharacterRange::Negate(ZoneList<CharacterRange>* ranges, |
| 6109 | ZoneList<CharacterRange>* negated_ranges, |
| 6110 | Zone* zone) { |
| 6111 | DCHECK(CharacterRange::IsCanonical(ranges)); |
| 6112 | DCHECK_EQ(0, negated_ranges->length()); |
| 6113 | int range_count = ranges->length(); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 6114 | uc32 from = 0; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6115 | int i = 0; |
| 6116 | if (range_count > 0 && ranges->at(0).from() == 0) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 6117 | from = ranges->at(0).to() + 1; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6118 | i = 1; |
| 6119 | } |
| 6120 | while (i < range_count) { |
| 6121 | CharacterRange range = ranges->at(i); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 6122 | negated_ranges->Add(CharacterRange::Range(from, range.from() - 1), zone); |
| 6123 | from = range.to() + 1; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6124 | i++; |
| 6125 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 6126 | if (from < String::kMaxCodePoint) { |
| 6127 | negated_ranges->Add(CharacterRange::Range(from, String::kMaxCodePoint), |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6128 | zone); |
| 6129 | } |
| 6130 | } |
| 6131 | |
| 6132 | |
| 6133 | // ------------------------------------------------------------------- |
| 6134 | // Splay tree |
| 6135 | |
| 6136 | |
| 6137 | OutSet* OutSet::Extend(unsigned value, Zone* zone) { |
| 6138 | if (Get(value)) |
| 6139 | return this; |
| 6140 | if (successors(zone) != NULL) { |
| 6141 | for (int i = 0; i < successors(zone)->length(); i++) { |
| 6142 | OutSet* successor = successors(zone)->at(i); |
| 6143 | if (successor->Get(value)) |
| 6144 | return successor; |
| 6145 | } |
| 6146 | } else { |
| 6147 | successors_ = new(zone) ZoneList<OutSet*>(2, zone); |
| 6148 | } |
| 6149 | OutSet* result = new(zone) OutSet(first_, remaining_); |
| 6150 | result->Set(value, zone); |
| 6151 | successors(zone)->Add(result, zone); |
| 6152 | return result; |
| 6153 | } |
| 6154 | |
| 6155 | |
| 6156 | void OutSet::Set(unsigned value, Zone *zone) { |
| 6157 | if (value < kFirstLimit) { |
| 6158 | first_ |= (1 << value); |
| 6159 | } else { |
| 6160 | if (remaining_ == NULL) |
| 6161 | remaining_ = new(zone) ZoneList<unsigned>(1, zone); |
| 6162 | if (remaining_->is_empty() || !remaining_->Contains(value)) |
| 6163 | remaining_->Add(value, zone); |
| 6164 | } |
| 6165 | } |
| 6166 | |
| 6167 | |
| 6168 | bool OutSet::Get(unsigned value) const { |
| 6169 | if (value < kFirstLimit) { |
| 6170 | return (first_ & (1 << value)) != 0; |
| 6171 | } else if (remaining_ == NULL) { |
| 6172 | return false; |
| 6173 | } else { |
| 6174 | return remaining_->Contains(value); |
| 6175 | } |
| 6176 | } |
| 6177 | |
| 6178 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 6179 | const uc32 DispatchTable::Config::kNoKey = unibrow::Utf8::kBadChar; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6180 | |
| 6181 | |
| 6182 | void DispatchTable::AddRange(CharacterRange full_range, int value, |
| 6183 | Zone* zone) { |
| 6184 | CharacterRange current = full_range; |
| 6185 | if (tree()->is_empty()) { |
| 6186 | // If this is the first range we just insert into the table. |
| 6187 | ZoneSplayTree<Config>::Locator loc; |
| 6188 | bool inserted = tree()->Insert(current.from(), &loc); |
| 6189 | DCHECK(inserted); |
| 6190 | USE(inserted); |
| 6191 | loc.set_value(Entry(current.from(), current.to(), |
| 6192 | empty()->Extend(value, zone))); |
| 6193 | return; |
| 6194 | } |
| 6195 | // First see if there is a range to the left of this one that |
| 6196 | // overlaps. |
| 6197 | ZoneSplayTree<Config>::Locator loc; |
| 6198 | if (tree()->FindGreatestLessThan(current.from(), &loc)) { |
| 6199 | Entry* entry = &loc.value(); |
| 6200 | // If we've found a range that overlaps with this one, and it |
| 6201 | // starts strictly to the left of this one, we have to fix it |
| 6202 | // because the following code only handles ranges that start on |
| 6203 | // or after the start point of the range we're adding. |
| 6204 | if (entry->from() < current.from() && entry->to() >= current.from()) { |
| 6205 | // Snap the overlapping range in half around the start point of |
| 6206 | // the range we're adding. |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 6207 | CharacterRange left = |
| 6208 | CharacterRange::Range(entry->from(), current.from() - 1); |
| 6209 | CharacterRange right = CharacterRange::Range(current.from(), entry->to()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6210 | // The left part of the overlapping range doesn't overlap. |
| 6211 | // Truncate the whole entry to be just the left part. |
| 6212 | entry->set_to(left.to()); |
| 6213 | // The right part is the one that overlaps. We add this part |
| 6214 | // to the map and let the next step deal with merging it with |
| 6215 | // the range we're adding. |
| 6216 | ZoneSplayTree<Config>::Locator loc; |
| 6217 | bool inserted = tree()->Insert(right.from(), &loc); |
| 6218 | DCHECK(inserted); |
| 6219 | USE(inserted); |
| 6220 | loc.set_value(Entry(right.from(), |
| 6221 | right.to(), |
| 6222 | entry->out_set())); |
| 6223 | } |
| 6224 | } |
| 6225 | while (current.is_valid()) { |
| 6226 | if (tree()->FindLeastGreaterThan(current.from(), &loc) && |
| 6227 | (loc.value().from() <= current.to()) && |
| 6228 | (loc.value().to() >= current.from())) { |
| 6229 | Entry* entry = &loc.value(); |
| 6230 | // We have overlap. If there is space between the start point of |
| 6231 | // the range we're adding and where the overlapping range starts |
| 6232 | // then we have to add a range covering just that space. |
| 6233 | if (current.from() < entry->from()) { |
| 6234 | ZoneSplayTree<Config>::Locator ins; |
| 6235 | bool inserted = tree()->Insert(current.from(), &ins); |
| 6236 | DCHECK(inserted); |
| 6237 | USE(inserted); |
| 6238 | ins.set_value(Entry(current.from(), |
| 6239 | entry->from() - 1, |
| 6240 | empty()->Extend(value, zone))); |
| 6241 | current.set_from(entry->from()); |
| 6242 | } |
| 6243 | DCHECK_EQ(current.from(), entry->from()); |
| 6244 | // If the overlapping range extends beyond the one we want to add |
| 6245 | // we have to snap the right part off and add it separately. |
| 6246 | if (entry->to() > current.to()) { |
| 6247 | ZoneSplayTree<Config>::Locator ins; |
| 6248 | bool inserted = tree()->Insert(current.to() + 1, &ins); |
| 6249 | DCHECK(inserted); |
| 6250 | USE(inserted); |
| 6251 | ins.set_value(Entry(current.to() + 1, |
| 6252 | entry->to(), |
| 6253 | entry->out_set())); |
| 6254 | entry->set_to(current.to()); |
| 6255 | } |
| 6256 | DCHECK(entry->to() <= current.to()); |
| 6257 | // The overlapping range is now completely contained by the range |
| 6258 | // we're adding so we can just update it and move the start point |
| 6259 | // of the range we're adding just past it. |
| 6260 | entry->AddValue(value, zone); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6261 | DCHECK(entry->to() + 1 > current.from()); |
| 6262 | current.set_from(entry->to() + 1); |
| 6263 | } else { |
| 6264 | // There is no overlap so we can just add the range |
| 6265 | ZoneSplayTree<Config>::Locator ins; |
| 6266 | bool inserted = tree()->Insert(current.from(), &ins); |
| 6267 | DCHECK(inserted); |
| 6268 | USE(inserted); |
| 6269 | ins.set_value(Entry(current.from(), |
| 6270 | current.to(), |
| 6271 | empty()->Extend(value, zone))); |
| 6272 | break; |
| 6273 | } |
| 6274 | } |
| 6275 | } |
| 6276 | |
| 6277 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 6278 | OutSet* DispatchTable::Get(uc32 value) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6279 | ZoneSplayTree<Config>::Locator loc; |
| 6280 | if (!tree()->FindGreatestLessThan(value, &loc)) |
| 6281 | return empty(); |
| 6282 | Entry* entry = &loc.value(); |
| 6283 | if (value <= entry->to()) |
| 6284 | return entry->out_set(); |
| 6285 | else |
| 6286 | return empty(); |
| 6287 | } |
| 6288 | |
| 6289 | |
| 6290 | // ------------------------------------------------------------------- |
| 6291 | // Analysis |
| 6292 | |
| 6293 | |
| 6294 | void Analysis::EnsureAnalyzed(RegExpNode* that) { |
| 6295 | StackLimitCheck check(isolate()); |
| 6296 | if (check.HasOverflowed()) { |
| 6297 | fail("Stack overflow"); |
| 6298 | return; |
| 6299 | } |
| 6300 | if (that->info()->been_analyzed || that->info()->being_analyzed) |
| 6301 | return; |
| 6302 | that->info()->being_analyzed = true; |
| 6303 | that->Accept(this); |
| 6304 | that->info()->being_analyzed = false; |
| 6305 | that->info()->been_analyzed = true; |
| 6306 | } |
| 6307 | |
| 6308 | |
| 6309 | void Analysis::VisitEnd(EndNode* that) { |
| 6310 | // nothing to do |
| 6311 | } |
| 6312 | |
| 6313 | |
| 6314 | void TextNode::CalculateOffsets() { |
| 6315 | int element_count = elements()->length(); |
| 6316 | // Set up the offsets of the elements relative to the start. This is a fixed |
| 6317 | // quantity since a TextNode can only contain fixed-width things. |
| 6318 | int cp_offset = 0; |
| 6319 | for (int i = 0; i < element_count; i++) { |
| 6320 | TextElement& elm = elements()->at(i); |
| 6321 | elm.set_cp_offset(cp_offset); |
| 6322 | cp_offset += elm.length(); |
| 6323 | } |
| 6324 | } |
| 6325 | |
| 6326 | |
| 6327 | void Analysis::VisitText(TextNode* that) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 6328 | if (ignore_case()) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6329 | that->MakeCaseIndependent(isolate(), is_one_byte_); |
| 6330 | } |
| 6331 | EnsureAnalyzed(that->on_success()); |
| 6332 | if (!has_failed()) { |
| 6333 | that->CalculateOffsets(); |
| 6334 | } |
| 6335 | } |
| 6336 | |
| 6337 | |
| 6338 | void Analysis::VisitAction(ActionNode* that) { |
| 6339 | RegExpNode* target = that->on_success(); |
| 6340 | EnsureAnalyzed(target); |
| 6341 | if (!has_failed()) { |
| 6342 | // If the next node is interested in what it follows then this node |
| 6343 | // has to be interested too so it can pass the information on. |
| 6344 | that->info()->AddFromFollowing(target->info()); |
| 6345 | } |
| 6346 | } |
| 6347 | |
| 6348 | |
| 6349 | void Analysis::VisitChoice(ChoiceNode* that) { |
| 6350 | NodeInfo* info = that->info(); |
| 6351 | for (int i = 0; i < that->alternatives()->length(); i++) { |
| 6352 | RegExpNode* node = that->alternatives()->at(i).node(); |
| 6353 | EnsureAnalyzed(node); |
| 6354 | if (has_failed()) return; |
| 6355 | // Anything the following nodes need to know has to be known by |
| 6356 | // this node also, so it can pass it on. |
| 6357 | info->AddFromFollowing(node->info()); |
| 6358 | } |
| 6359 | } |
| 6360 | |
| 6361 | |
| 6362 | void Analysis::VisitLoopChoice(LoopChoiceNode* that) { |
| 6363 | NodeInfo* info = that->info(); |
| 6364 | for (int i = 0; i < that->alternatives()->length(); i++) { |
| 6365 | RegExpNode* node = that->alternatives()->at(i).node(); |
| 6366 | if (node != that->loop_node()) { |
| 6367 | EnsureAnalyzed(node); |
| 6368 | if (has_failed()) return; |
| 6369 | info->AddFromFollowing(node->info()); |
| 6370 | } |
| 6371 | } |
| 6372 | // Check the loop last since it may need the value of this node |
| 6373 | // to get a correct result. |
| 6374 | EnsureAnalyzed(that->loop_node()); |
| 6375 | if (!has_failed()) { |
| 6376 | info->AddFromFollowing(that->loop_node()->info()); |
| 6377 | } |
| 6378 | } |
| 6379 | |
| 6380 | |
| 6381 | void Analysis::VisitBackReference(BackReferenceNode* that) { |
| 6382 | EnsureAnalyzed(that->on_success()); |
| 6383 | } |
| 6384 | |
| 6385 | |
| 6386 | void Analysis::VisitAssertion(AssertionNode* that) { |
| 6387 | EnsureAnalyzed(that->on_success()); |
| 6388 | } |
| 6389 | |
| 6390 | |
| 6391 | void BackReferenceNode::FillInBMInfo(Isolate* isolate, int offset, int budget, |
| 6392 | BoyerMooreLookahead* bm, |
| 6393 | bool not_at_start) { |
| 6394 | // Working out the set of characters that a backreference can match is too |
| 6395 | // hard, so we just say that any character can match. |
| 6396 | bm->SetRest(offset); |
| 6397 | SaveBMInfo(bm, not_at_start, offset); |
| 6398 | } |
| 6399 | |
| 6400 | |
| 6401 | STATIC_ASSERT(BoyerMoorePositionInfo::kMapSize == |
| 6402 | RegExpMacroAssembler::kTableSize); |
| 6403 | |
| 6404 | |
| 6405 | void ChoiceNode::FillInBMInfo(Isolate* isolate, int offset, int budget, |
| 6406 | BoyerMooreLookahead* bm, bool not_at_start) { |
| 6407 | ZoneList<GuardedAlternative>* alts = alternatives(); |
| 6408 | budget = (budget - 1) / alts->length(); |
| 6409 | for (int i = 0; i < alts->length(); i++) { |
| 6410 | GuardedAlternative& alt = alts->at(i); |
| 6411 | if (alt.guards() != NULL && alt.guards()->length() != 0) { |
| 6412 | bm->SetRest(offset); // Give up trying to fill in info. |
| 6413 | SaveBMInfo(bm, not_at_start, offset); |
| 6414 | return; |
| 6415 | } |
| 6416 | alt.node()->FillInBMInfo(isolate, offset, budget, bm, not_at_start); |
| 6417 | } |
| 6418 | SaveBMInfo(bm, not_at_start, offset); |
| 6419 | } |
| 6420 | |
| 6421 | |
| 6422 | void TextNode::FillInBMInfo(Isolate* isolate, int initial_offset, int budget, |
| 6423 | BoyerMooreLookahead* bm, bool not_at_start) { |
| 6424 | if (initial_offset >= bm->length()) return; |
| 6425 | int offset = initial_offset; |
| 6426 | int max_char = bm->max_char(); |
| 6427 | for (int i = 0; i < elements()->length(); i++) { |
| 6428 | if (offset >= bm->length()) { |
| 6429 | if (initial_offset == 0) set_bm_info(not_at_start, bm); |
| 6430 | return; |
| 6431 | } |
| 6432 | TextElement text = elements()->at(i); |
| 6433 | if (text.text_type() == TextElement::ATOM) { |
| 6434 | RegExpAtom* atom = text.atom(); |
| 6435 | for (int j = 0; j < atom->length(); j++, offset++) { |
| 6436 | if (offset >= bm->length()) { |
| 6437 | if (initial_offset == 0) set_bm_info(not_at_start, bm); |
| 6438 | return; |
| 6439 | } |
| 6440 | uc16 character = atom->data()[j]; |
| 6441 | if (bm->compiler()->ignore_case()) { |
| 6442 | unibrow::uchar chars[unibrow::Ecma262UnCanonicalize::kMaxWidth]; |
| 6443 | int length = GetCaseIndependentLetters( |
| 6444 | isolate, character, bm->max_char() == String::kMaxOneByteCharCode, |
| 6445 | chars); |
| 6446 | for (int j = 0; j < length; j++) { |
| 6447 | bm->Set(offset, chars[j]); |
| 6448 | } |
| 6449 | } else { |
| 6450 | if (character <= max_char) bm->Set(offset, character); |
| 6451 | } |
| 6452 | } |
| 6453 | } else { |
| 6454 | DCHECK_EQ(TextElement::CHAR_CLASS, text.text_type()); |
| 6455 | RegExpCharacterClass* char_class = text.char_class(); |
| 6456 | ZoneList<CharacterRange>* ranges = char_class->ranges(zone()); |
| 6457 | if (char_class->is_negated()) { |
| 6458 | bm->SetAll(offset); |
| 6459 | } else { |
| 6460 | for (int k = 0; k < ranges->length(); k++) { |
| 6461 | CharacterRange& range = ranges->at(k); |
| 6462 | if (range.from() > max_char) continue; |
| 6463 | int to = Min(max_char, static_cast<int>(range.to())); |
| 6464 | bm->SetInterval(offset, Interval(range.from(), to)); |
| 6465 | } |
| 6466 | } |
| 6467 | offset++; |
| 6468 | } |
| 6469 | } |
| 6470 | if (offset >= bm->length()) { |
| 6471 | if (initial_offset == 0) set_bm_info(not_at_start, bm); |
| 6472 | return; |
| 6473 | } |
| 6474 | on_success()->FillInBMInfo(isolate, offset, budget - 1, bm, |
| 6475 | true); // Not at start after a text node. |
| 6476 | if (initial_offset == 0) set_bm_info(not_at_start, bm); |
| 6477 | } |
| 6478 | |
| 6479 | |
| 6480 | // ------------------------------------------------------------------- |
| 6481 | // Dispatch table construction |
| 6482 | |
| 6483 | |
| 6484 | void DispatchTableConstructor::VisitEnd(EndNode* that) { |
| 6485 | AddRange(CharacterRange::Everything()); |
| 6486 | } |
| 6487 | |
| 6488 | |
| 6489 | void DispatchTableConstructor::BuildTable(ChoiceNode* node) { |
| 6490 | node->set_being_calculated(true); |
| 6491 | ZoneList<GuardedAlternative>* alternatives = node->alternatives(); |
| 6492 | for (int i = 0; i < alternatives->length(); i++) { |
| 6493 | set_choice_index(i); |
| 6494 | alternatives->at(i).node()->Accept(this); |
| 6495 | } |
| 6496 | node->set_being_calculated(false); |
| 6497 | } |
| 6498 | |
| 6499 | |
| 6500 | class AddDispatchRange { |
| 6501 | public: |
| 6502 | explicit AddDispatchRange(DispatchTableConstructor* constructor) |
| 6503 | : constructor_(constructor) { } |
| 6504 | void Call(uc32 from, DispatchTable::Entry entry); |
| 6505 | private: |
| 6506 | DispatchTableConstructor* constructor_; |
| 6507 | }; |
| 6508 | |
| 6509 | |
| 6510 | void AddDispatchRange::Call(uc32 from, DispatchTable::Entry entry) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 6511 | constructor_->AddRange(CharacterRange::Range(from, entry.to())); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6512 | } |
| 6513 | |
| 6514 | |
| 6515 | void DispatchTableConstructor::VisitChoice(ChoiceNode* node) { |
| 6516 | if (node->being_calculated()) |
| 6517 | return; |
| 6518 | DispatchTable* table = node->GetTable(ignore_case_); |
| 6519 | AddDispatchRange adder(this); |
| 6520 | table->ForEach(&adder); |
| 6521 | } |
| 6522 | |
| 6523 | |
| 6524 | void DispatchTableConstructor::VisitBackReference(BackReferenceNode* that) { |
| 6525 | // TODO(160): Find the node that we refer back to and propagate its start |
| 6526 | // set back to here. For now we just accept anything. |
| 6527 | AddRange(CharacterRange::Everything()); |
| 6528 | } |
| 6529 | |
| 6530 | |
| 6531 | void DispatchTableConstructor::VisitAssertion(AssertionNode* that) { |
| 6532 | RegExpNode* target = that->on_success(); |
| 6533 | target->Accept(this); |
| 6534 | } |
| 6535 | |
| 6536 | |
| 6537 | static int CompareRangeByFrom(const CharacterRange* a, |
| 6538 | const CharacterRange* b) { |
| 6539 | return Compare<uc16>(a->from(), b->from()); |
| 6540 | } |
| 6541 | |
| 6542 | |
| 6543 | void DispatchTableConstructor::AddInverse(ZoneList<CharacterRange>* ranges) { |
| 6544 | ranges->Sort(CompareRangeByFrom); |
| 6545 | uc16 last = 0; |
| 6546 | for (int i = 0; i < ranges->length(); i++) { |
| 6547 | CharacterRange range = ranges->at(i); |
| 6548 | if (last < range.from()) |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 6549 | AddRange(CharacterRange::Range(last, range.from() - 1)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6550 | if (range.to() >= last) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 6551 | if (range.to() == String::kMaxCodePoint) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6552 | return; |
| 6553 | } else { |
| 6554 | last = range.to() + 1; |
| 6555 | } |
| 6556 | } |
| 6557 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 6558 | AddRange(CharacterRange::Range(last, String::kMaxCodePoint)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6559 | } |
| 6560 | |
| 6561 | |
| 6562 | void DispatchTableConstructor::VisitText(TextNode* that) { |
| 6563 | TextElement elm = that->elements()->at(0); |
| 6564 | switch (elm.text_type()) { |
| 6565 | case TextElement::ATOM: { |
| 6566 | uc16 c = elm.atom()->data()[0]; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 6567 | AddRange(CharacterRange::Range(c, c)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6568 | break; |
| 6569 | } |
| 6570 | case TextElement::CHAR_CLASS: { |
| 6571 | RegExpCharacterClass* tree = elm.char_class(); |
| 6572 | ZoneList<CharacterRange>* ranges = tree->ranges(that->zone()); |
| 6573 | if (tree->is_negated()) { |
| 6574 | AddInverse(ranges); |
| 6575 | } else { |
| 6576 | for (int i = 0; i < ranges->length(); i++) |
| 6577 | AddRange(ranges->at(i)); |
| 6578 | } |
| 6579 | break; |
| 6580 | } |
| 6581 | default: { |
| 6582 | UNIMPLEMENTED(); |
| 6583 | } |
| 6584 | } |
| 6585 | } |
| 6586 | |
| 6587 | |
| 6588 | void DispatchTableConstructor::VisitAction(ActionNode* that) { |
| 6589 | RegExpNode* target = that->on_success(); |
| 6590 | target->Accept(this); |
| 6591 | } |
| 6592 | |
| 6593 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 6594 | RegExpNode* OptionallyStepBackToLeadSurrogate(RegExpCompiler* compiler, |
| 6595 | RegExpNode* on_success) { |
| 6596 | // If the regexp matching starts within a surrogate pair, step back |
| 6597 | // to the lead surrogate and start matching from there. |
| 6598 | DCHECK(!compiler->read_backward()); |
| 6599 | Zone* zone = compiler->zone(); |
| 6600 | ZoneList<CharacterRange>* lead_surrogates = CharacterRange::List( |
| 6601 | zone, CharacterRange::Range(kLeadSurrogateStart, kLeadSurrogateEnd)); |
| 6602 | ZoneList<CharacterRange>* trail_surrogates = CharacterRange::List( |
| 6603 | zone, CharacterRange::Range(kTrailSurrogateStart, kTrailSurrogateEnd)); |
| 6604 | |
| 6605 | ChoiceNode* optional_step_back = new (zone) ChoiceNode(2, zone); |
| 6606 | |
| 6607 | int stack_register = compiler->UnicodeLookaroundStackRegister(); |
| 6608 | int position_register = compiler->UnicodeLookaroundPositionRegister(); |
| 6609 | RegExpNode* step_back = TextNode::CreateForCharacterRanges( |
| 6610 | zone, lead_surrogates, true, on_success); |
| 6611 | RegExpLookaround::Builder builder(true, step_back, stack_register, |
| 6612 | position_register); |
| 6613 | RegExpNode* match_trail = TextNode::CreateForCharacterRanges( |
| 6614 | zone, trail_surrogates, false, builder.on_match_success()); |
| 6615 | |
| 6616 | optional_step_back->AddAlternative( |
| 6617 | GuardedAlternative(builder.ForMatch(match_trail))); |
| 6618 | optional_step_back->AddAlternative(GuardedAlternative(on_success)); |
| 6619 | |
| 6620 | return optional_step_back; |
| 6621 | } |
| 6622 | |
| 6623 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6624 | RegExpEngine::CompilationResult RegExpEngine::Compile( |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 6625 | Isolate* isolate, Zone* zone, RegExpCompileData* data, |
| 6626 | JSRegExp::Flags flags, Handle<String> pattern, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6627 | Handle<String> sample_subject, bool is_one_byte) { |
| 6628 | if ((data->capture_count + 1) * 2 - 1 > RegExpMacroAssembler::kMaxRegister) { |
| 6629 | return IrregexpRegExpTooBig(isolate); |
| 6630 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 6631 | bool ignore_case = flags & JSRegExp::kIgnoreCase; |
| 6632 | bool is_sticky = flags & JSRegExp::kSticky; |
| 6633 | bool is_global = flags & JSRegExp::kGlobal; |
| 6634 | bool is_unicode = flags & JSRegExp::kUnicode; |
| 6635 | RegExpCompiler compiler(isolate, zone, data->capture_count, flags, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6636 | is_one_byte); |
| 6637 | |
| 6638 | if (compiler.optimize()) compiler.set_optimize(!TooMuchRegExpCode(pattern)); |
| 6639 | |
| 6640 | // Sample some characters from the middle of the string. |
| 6641 | static const int kSampleSize = 128; |
| 6642 | |
| 6643 | sample_subject = String::Flatten(sample_subject); |
| 6644 | int chars_sampled = 0; |
| 6645 | int half_way = (sample_subject->length() - kSampleSize) / 2; |
| 6646 | for (int i = Max(0, half_way); |
| 6647 | i < sample_subject->length() && chars_sampled < kSampleSize; |
| 6648 | i++, chars_sampled++) { |
| 6649 | compiler.frequency_collator()->CountCharacter(sample_subject->Get(i)); |
| 6650 | } |
| 6651 | |
| 6652 | // Wrap the body of the regexp in capture #0. |
| 6653 | RegExpNode* captured_body = RegExpCapture::ToNode(data->tree, |
| 6654 | 0, |
| 6655 | &compiler, |
| 6656 | compiler.accept()); |
| 6657 | RegExpNode* node = captured_body; |
| 6658 | bool is_end_anchored = data->tree->IsAnchoredAtEnd(); |
| 6659 | bool is_start_anchored = data->tree->IsAnchoredAtStart(); |
| 6660 | int max_length = data->tree->max_match(); |
| 6661 | if (!is_start_anchored && !is_sticky) { |
| 6662 | // Add a .*? at the beginning, outside the body capture, unless |
| 6663 | // this expression is anchored at the beginning or sticky. |
| 6664 | RegExpNode* loop_node = RegExpQuantifier::ToNode( |
| 6665 | 0, RegExpTree::kInfinity, false, new (zone) RegExpCharacterClass('*'), |
| 6666 | &compiler, captured_body, data->contains_anchor); |
| 6667 | |
| 6668 | if (data->contains_anchor) { |
| 6669 | // Unroll loop once, to take care of the case that might start |
| 6670 | // at the start of input. |
| 6671 | ChoiceNode* first_step_node = new(zone) ChoiceNode(2, zone); |
| 6672 | first_step_node->AddAlternative(GuardedAlternative(captured_body)); |
| 6673 | first_step_node->AddAlternative(GuardedAlternative(new (zone) TextNode( |
| 6674 | new (zone) RegExpCharacterClass('*'), false, loop_node))); |
| 6675 | node = first_step_node; |
| 6676 | } else { |
| 6677 | node = loop_node; |
| 6678 | } |
| 6679 | } |
| 6680 | if (is_one_byte) { |
| 6681 | node = node->FilterOneByte(RegExpCompiler::kMaxRecursion, ignore_case); |
| 6682 | // Do it again to propagate the new nodes to places where they were not |
| 6683 | // put because they had not been calculated yet. |
| 6684 | if (node != NULL) { |
| 6685 | node = node->FilterOneByte(RegExpCompiler::kMaxRecursion, ignore_case); |
| 6686 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 6687 | } else if (compiler.unicode() && (is_global || is_sticky)) { |
| 6688 | node = OptionallyStepBackToLeadSurrogate(&compiler, node); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6689 | } |
| 6690 | |
| 6691 | if (node == NULL) node = new(zone) EndNode(EndNode::BACKTRACK, zone); |
| 6692 | data->node = node; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 6693 | Analysis analysis(isolate, flags, is_one_byte); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6694 | analysis.EnsureAnalyzed(node); |
| 6695 | if (analysis.has_failed()) { |
| 6696 | const char* error_message = analysis.error_message(); |
| 6697 | return CompilationResult(isolate, error_message); |
| 6698 | } |
| 6699 | |
| 6700 | // Create the correct assembler for the architecture. |
| 6701 | #ifndef V8_INTERPRETED_REGEXP |
| 6702 | // Native regexp implementation. |
| 6703 | |
| 6704 | NativeRegExpMacroAssembler::Mode mode = |
| 6705 | is_one_byte ? NativeRegExpMacroAssembler::LATIN1 |
| 6706 | : NativeRegExpMacroAssembler::UC16; |
| 6707 | |
| 6708 | #if V8_TARGET_ARCH_IA32 |
| 6709 | RegExpMacroAssemblerIA32 macro_assembler(isolate, zone, mode, |
| 6710 | (data->capture_count + 1) * 2); |
| 6711 | #elif V8_TARGET_ARCH_X64 |
| 6712 | RegExpMacroAssemblerX64 macro_assembler(isolate, zone, mode, |
| 6713 | (data->capture_count + 1) * 2); |
| 6714 | #elif V8_TARGET_ARCH_ARM |
| 6715 | RegExpMacroAssemblerARM macro_assembler(isolate, zone, mode, |
| 6716 | (data->capture_count + 1) * 2); |
| 6717 | #elif V8_TARGET_ARCH_ARM64 |
| 6718 | RegExpMacroAssemblerARM64 macro_assembler(isolate, zone, mode, |
| 6719 | (data->capture_count + 1) * 2); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 6720 | #elif V8_TARGET_ARCH_S390 |
| 6721 | RegExpMacroAssemblerS390 macro_assembler(isolate, zone, mode, |
| 6722 | (data->capture_count + 1) * 2); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6723 | #elif V8_TARGET_ARCH_PPC |
| 6724 | RegExpMacroAssemblerPPC macro_assembler(isolate, zone, mode, |
| 6725 | (data->capture_count + 1) * 2); |
| 6726 | #elif V8_TARGET_ARCH_MIPS |
| 6727 | RegExpMacroAssemblerMIPS macro_assembler(isolate, zone, mode, |
| 6728 | (data->capture_count + 1) * 2); |
| 6729 | #elif V8_TARGET_ARCH_MIPS64 |
| 6730 | RegExpMacroAssemblerMIPS macro_assembler(isolate, zone, mode, |
| 6731 | (data->capture_count + 1) * 2); |
| 6732 | #elif V8_TARGET_ARCH_X87 |
| 6733 | RegExpMacroAssemblerX87 macro_assembler(isolate, zone, mode, |
| 6734 | (data->capture_count + 1) * 2); |
| 6735 | #else |
| 6736 | #error "Unsupported architecture" |
| 6737 | #endif |
| 6738 | |
| 6739 | #else // V8_INTERPRETED_REGEXP |
| 6740 | // Interpreted regexp implementation. |
| 6741 | EmbeddedVector<byte, 1024> codes; |
| 6742 | RegExpMacroAssemblerIrregexp macro_assembler(isolate, codes, zone); |
| 6743 | #endif // V8_INTERPRETED_REGEXP |
| 6744 | |
| 6745 | macro_assembler.set_slow_safe(TooMuchRegExpCode(pattern)); |
| 6746 | |
| 6747 | // Inserted here, instead of in Assembler, because it depends on information |
| 6748 | // in the AST that isn't replicated in the Node structure. |
| 6749 | static const int kMaxBacksearchLimit = 1024; |
| 6750 | if (is_end_anchored && |
| 6751 | !is_start_anchored && |
| 6752 | max_length < kMaxBacksearchLimit) { |
| 6753 | macro_assembler.SetCurrentPositionFromEnd(max_length); |
| 6754 | } |
| 6755 | |
| 6756 | if (is_global) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 6757 | RegExpMacroAssembler::GlobalMode mode = RegExpMacroAssembler::GLOBAL; |
| 6758 | if (data->tree->min_match() > 0) { |
| 6759 | mode = RegExpMacroAssembler::GLOBAL_NO_ZERO_LENGTH_CHECK; |
| 6760 | } else if (is_unicode) { |
| 6761 | mode = RegExpMacroAssembler::GLOBAL_UNICODE; |
| 6762 | } |
| 6763 | macro_assembler.set_global_mode(mode); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6764 | } |
| 6765 | |
| 6766 | return compiler.Assemble(¯o_assembler, |
| 6767 | node, |
| 6768 | data->capture_count, |
| 6769 | pattern); |
| 6770 | } |
| 6771 | |
| 6772 | |
| 6773 | bool RegExpEngine::TooMuchRegExpCode(Handle<String> pattern) { |
| 6774 | Heap* heap = pattern->GetHeap(); |
| 6775 | bool too_much = pattern->length() > RegExpImpl::kRegExpTooLargeToOptimize; |
| 6776 | if (heap->total_regexp_code_generated() > RegExpImpl::kRegExpCompiledLimit && |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 6777 | heap->memory_allocator()->SizeExecutable() > |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6778 | RegExpImpl::kRegExpExecutableMemoryLimit) { |
| 6779 | too_much = true; |
| 6780 | } |
| 6781 | return too_much; |
| 6782 | } |
| 6783 | |
| 6784 | |
| 6785 | Object* RegExpResultsCache::Lookup(Heap* heap, String* key_string, |
| 6786 | Object* key_pattern, |
| 6787 | FixedArray** last_match_cache, |
| 6788 | ResultsCacheType type) { |
| 6789 | FixedArray* cache; |
| 6790 | if (!key_string->IsInternalizedString()) return Smi::FromInt(0); |
| 6791 | if (type == STRING_SPLIT_SUBSTRINGS) { |
| 6792 | DCHECK(key_pattern->IsString()); |
| 6793 | if (!key_pattern->IsInternalizedString()) return Smi::FromInt(0); |
| 6794 | cache = heap->string_split_cache(); |
| 6795 | } else { |
| 6796 | DCHECK(type == REGEXP_MULTIPLE_INDICES); |
| 6797 | DCHECK(key_pattern->IsFixedArray()); |
| 6798 | cache = heap->regexp_multiple_cache(); |
| 6799 | } |
| 6800 | |
| 6801 | uint32_t hash = key_string->Hash(); |
| 6802 | uint32_t index = ((hash & (kRegExpResultsCacheSize - 1)) & |
| 6803 | ~(kArrayEntriesPerCacheEntry - 1)); |
| 6804 | if (cache->get(index + kStringOffset) != key_string || |
| 6805 | cache->get(index + kPatternOffset) != key_pattern) { |
| 6806 | index = |
| 6807 | ((index + kArrayEntriesPerCacheEntry) & (kRegExpResultsCacheSize - 1)); |
| 6808 | if (cache->get(index + kStringOffset) != key_string || |
| 6809 | cache->get(index + kPatternOffset) != key_pattern) { |
| 6810 | return Smi::FromInt(0); |
| 6811 | } |
| 6812 | } |
| 6813 | |
| 6814 | *last_match_cache = FixedArray::cast(cache->get(index + kLastMatchOffset)); |
| 6815 | return cache->get(index + kArrayOffset); |
| 6816 | } |
| 6817 | |
| 6818 | |
| 6819 | void RegExpResultsCache::Enter(Isolate* isolate, Handle<String> key_string, |
| 6820 | Handle<Object> key_pattern, |
| 6821 | Handle<FixedArray> value_array, |
| 6822 | Handle<FixedArray> last_match_cache, |
| 6823 | ResultsCacheType type) { |
| 6824 | Factory* factory = isolate->factory(); |
| 6825 | Handle<FixedArray> cache; |
| 6826 | if (!key_string->IsInternalizedString()) return; |
| 6827 | if (type == STRING_SPLIT_SUBSTRINGS) { |
| 6828 | DCHECK(key_pattern->IsString()); |
| 6829 | if (!key_pattern->IsInternalizedString()) return; |
| 6830 | cache = factory->string_split_cache(); |
| 6831 | } else { |
| 6832 | DCHECK(type == REGEXP_MULTIPLE_INDICES); |
| 6833 | DCHECK(key_pattern->IsFixedArray()); |
| 6834 | cache = factory->regexp_multiple_cache(); |
| 6835 | } |
| 6836 | |
| 6837 | uint32_t hash = key_string->Hash(); |
| 6838 | uint32_t index = ((hash & (kRegExpResultsCacheSize - 1)) & |
| 6839 | ~(kArrayEntriesPerCacheEntry - 1)); |
| 6840 | if (cache->get(index + kStringOffset) == Smi::FromInt(0)) { |
| 6841 | cache->set(index + kStringOffset, *key_string); |
| 6842 | cache->set(index + kPatternOffset, *key_pattern); |
| 6843 | cache->set(index + kArrayOffset, *value_array); |
| 6844 | cache->set(index + kLastMatchOffset, *last_match_cache); |
| 6845 | } else { |
| 6846 | uint32_t index2 = |
| 6847 | ((index + kArrayEntriesPerCacheEntry) & (kRegExpResultsCacheSize - 1)); |
| 6848 | if (cache->get(index2 + kStringOffset) == Smi::FromInt(0)) { |
| 6849 | cache->set(index2 + kStringOffset, *key_string); |
| 6850 | cache->set(index2 + kPatternOffset, *key_pattern); |
| 6851 | cache->set(index2 + kArrayOffset, *value_array); |
| 6852 | cache->set(index2 + kLastMatchOffset, *last_match_cache); |
| 6853 | } else { |
| 6854 | cache->set(index2 + kStringOffset, Smi::FromInt(0)); |
| 6855 | cache->set(index2 + kPatternOffset, Smi::FromInt(0)); |
| 6856 | cache->set(index2 + kArrayOffset, Smi::FromInt(0)); |
| 6857 | cache->set(index2 + kLastMatchOffset, Smi::FromInt(0)); |
| 6858 | cache->set(index + kStringOffset, *key_string); |
| 6859 | cache->set(index + kPatternOffset, *key_pattern); |
| 6860 | cache->set(index + kArrayOffset, *value_array); |
| 6861 | cache->set(index + kLastMatchOffset, *last_match_cache); |
| 6862 | } |
| 6863 | } |
| 6864 | // If the array is a reasonably short list of substrings, convert it into a |
| 6865 | // list of internalized strings. |
| 6866 | if (type == STRING_SPLIT_SUBSTRINGS && value_array->length() < 100) { |
| 6867 | for (int i = 0; i < value_array->length(); i++) { |
| 6868 | Handle<String> str(String::cast(value_array->get(i)), isolate); |
| 6869 | Handle<String> internalized_str = factory->InternalizeString(str); |
| 6870 | value_array->set(i, *internalized_str); |
| 6871 | } |
| 6872 | } |
| 6873 | // Convert backing store to a copy-on-write array. |
| 6874 | value_array->set_map_no_write_barrier(*factory->fixed_cow_array_map()); |
| 6875 | } |
| 6876 | |
| 6877 | |
| 6878 | void RegExpResultsCache::Clear(FixedArray* cache) { |
| 6879 | for (int i = 0; i < kRegExpResultsCacheSize; i++) { |
| 6880 | cache->set(i, Smi::FromInt(0)); |
| 6881 | } |
| 6882 | } |
| 6883 | |
| 6884 | } // namespace internal |
| 6885 | } // namespace v8 |